ne \ ne N ae Aalen h er a er EN . a Ku ee ran \ & er ung X Kh ei le een en er u ur R Be Er “ EL Pa SEN N UM Ur Sp c% I ) r ri a ws rue ee he - u % 5 ir % a a an ee On A“ Re TE BF FREENET ü ET an Degen Ve ” n a el 2 "niet r\ ee m » weni ter, Da en a r . y Toy) TE » e en SEE RER ren Le) 2 & ee t a A N 7 Der Yr ir Bi Pu an eh ee r Re Ba eg data ee ee RB DILEN Ba re zand } N Se yr nr a af & BEE rg Er IL wu A ra Ka che Reh b ee RR DT * UT U £ nBE Rn Ihe LEE Free REG Paar, Bank Be Das Tierreich. Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen. — a. Begründet von der Deutschen Zoologischen Gesellschaft. —__ Im Auftrage der Königl. Preuß. Akademie der Wissenschaften zu Berlin herausgegeben von Franz Eilhard Schulze. „Deavra der.“ „Sine systemate chaos.“ 21. Lieferung. Crustacea. Beirat: W. Giesbrecht. Amphipoda I. Gammaridea by the Rev. T.R. R. Stebbing, M. A., F.R. S., F.L. S., F. Z.8.; Fellow of King’s College, London; formerly Fellow and Tutor of Worcester College, Oxford. With 127 figures. —— Berlin. ö Verlag von R. Friedländer und Sohn. 4 Ausgegeben im September 1906. N —-- Das Tierreich. Im Auftrage der Königl. Preuß. Akademie der Wissenschaften zu Berlin herausgegeben von Franz Eilhard Schulze, 21. Lieferung. Orustacea. Beirat: W. Giesbrecht, Amphipoda I. Gammaridea by v the Rev. T.R. R. Stebbing, M. A., F.R.S, F.L.S,F.ZS.: "Fellow of King’s College, London; formerly Fellow and Tutor of Worcester College, Oxford. With 127 figures. HESH Berlin. Verlag von R. Friedländer und Sohn. Ausgegeben im September 1906. Contents. Pag. A er ; V Abbreviations of the titles of literature. . » -»- » 22 220 20 VI RR Re A a EL XIX BE Ser Eee ER 1 a a aan Vaio ; 5 a: ER a EEE 717 Alphabetical Index... .... RE EN BE Nomenclator generum et subgenerum . . » 2. 2: 22220 n.. 786 Preface. It was originally contemplated that this volume would be published within the limits of the nineteenth century. When the date of issue was unavoidably postponed, the internal structure of the work no longer admitted of any extensive remodelling. In the mean time, however, it so happened that our knowledge of the Amphipoda was enlarged by several important contributions.. Accordingly the survey of the literature, which had been carried down with some completeness to 1898, was prematurely suffering from that imperfection by whieh all such surveys are eventually afflieted. To remedy this inconvenience so fal" »istpössible, the editor has kindly permitted the addition of many pages which bring the bibliography. of the subject well into 1905, with an occasional incursion even into the present year. In regard to the numerous species recorded as douktful, it is desirable to explain that in many instances no censure is intended of the original descriptions. The doubtfulness often results only from the fact that recent classification has adopted features of distinetion, the employment of which could not easily have been foreseen at an earlier period. The nature of the present work includes acknowledgment of indebtedness to innumerable authors. To the editorial staff of „Das Tierreich“ the thanks of readers should be united with those of contributors, if the most unremitting care in verifying eitations is thought worthy of gratitude. T. R. R, Stebbing, Ephraim Lodge, July 7, 1906, Tunbridge Wells, England. Abbreviations of the titles of literature. Abh. Schles. Ges. — Abhandlungen der Schlesischen Gesellschaft für vaterländische Cultur. — Abtheilung für Naturwissenschaften und Mediein. Breslau. 8. Acta Ac. Petrop. -— Acta Academiae Seientiarum Imperialis Petropolitanae. Petropoli. 4 Acta Univ. Lund. — Acta Universitatis Lundensis. Lunds Universitets Ärs-Skrift. — Afdelningen för Mathematik och Naturvetenskap ([Tom. 26 & sequ.:] Acta Regiae Societatis physiographieae Lundensis. Kongl. fysiografiska Sällskapets i Lund Handlingar). Lund. 4. Act. Soc. Helvet. — Actes de la Societ& Helvetique des Sciences naturelles.. Lausanne (Gen?ve,...). 8. Agassiz, Nomenel. zool. — Nomenelator zoologicus, continens Nomina systematica Generum Animalium tam viventium quam fossilium. Auctore L. Agassiz. 1 Vol. & Index universalis. Soloduri. 1842—46, 46. 4. Amer. J. Sci. — The American Journal of Seience and Arts. New Haven (New York). 8. Amer. monthly Mag. — The American monthly Magazine and critical Review. New York. 8. Amer. Natural. — 'The American Naturalist. Salem (Philadelphia) (Boston). 8. Ann. nat. Hist. — The Annals and- Magazine of natural History, including Zoology, Botany, and Geology. London. 8. Ann. N.York Ac. — Annals of the New York Academy of Sciences, late Lyceum of natural History. New York. 8. Ann. Sei. nat. — Annales des Sciences naturelles. — [Ser. 2—4:] Zoologie ([Ser. 5 & sequ.:] Zoologie et Pal&ontologie). Paris. 8. Ann. Soe. ent. Belgique — Annales de la Soeiete entomologique de Belgique. Bruxelles. 8. Annuaire Mus. St.-Pötersb. — Annuaire du Musee zoologique de l’Acad&mie Imperiale des Sciences de St.-Petersbourg. St.-Petersbourg. 8. Annwario Mus. Napoli — Annuario del Museo zoologico della R. Universitä di Napoli. Napoli. 8. Ann. Univ. Lyon — Annales de l’Universit€ de Lyon. Paris. 8. Arb. Inst. Wien — Arbeiten aus dem zoologischen Institute der Universität Wien und der zoologischen Station in Triest. Wien. 8. Arch. Mus. Lyon — Archives du Museum d’Histoire naturelle de Lyon. Lyon. 4. Arch. Mus. Rio Jan. — Archivos do Museu nacional do Rio de Janeiro. Rio de Janeiro. 4. Arch. Naturg. — Archiv für Naturgeschichte. Berlin. 8. Arch. Naturv. Kristian. — Archiv for Mathematik og Naturvidenskab. Kristiania. 8. Atti Acc. Borbon. — Atti della Reale Accademia delle Seienze, Sezione della Societä + Reale Borboniea. Napoli. 4. Atti Acc. Napoli — Soeietä Reale di Napoli. Atti della Reale Accademia delle Scienze fisiiche e matematiche. Napoli. 4. Atti Soc. Ital. — Atti della Soeietä Italiana di Scienze naturali. Milano. 8. Barrois, Cat. Crust. Acores — Catalogue des Crustacös marins recueillis aux’ Acores durant les Mois d’Aoüt et Septembre 1887. Par Th. Barrois. Lille. 1888. 8. ” Barrois, Note Orchesties — Note sur quelques Points de la Morphologie des Orchesties suivie d’une Liste suceinete des Amphipodes du Boulonnais. Par Th. Barrois. Lille. 1887. 8. Ahyrskiaklons ' the titles of literature Vo rg Cat. Amphip. Brit. Mus. — Catalogue of the Speceimens of Amphipodous Crustacea in the Colleetion of the British „Museum. By C. Spence Bate. London. 1862 [Preface dat. 1862 XII]. 8." Bate & Westwood, Brit. sess. Crust. — A History of the British sessile-eyed Crustacea. By ©. Spenee Bate and J.O. Westwood. Vol.1,2. London. 1863 (1861—63, 68), 68 (1863, 66—68)*). 8. Belcher, Last Arct. Voy. — The last of the Arctic Voyages; being a Narrative of the Expedition in H. M. S. Assistance, under the Command of Captain Sir Edward Belcher, in Search of Sir John Franklin, during the Years 1852—54. With Notes on the natural History, by Sir John Richardson, [Richard] Owen, Thomas Bell, J. W. Salter, and LovellReeve, Vol.1,2. London. 1855. 8. Berlin. ent. Z. — Berliner entomologische Zeitschrift. Berlin. 8. . Bih. Svenska Ak. — Bihang till Kongl. Svenska -Vetenskaps-Akademiens Handlingar. — Afdelning 4, Zoologi. Stockholm. 8. Bijdr. Dierk. — Bijdragen tot de Dierkunde. Uitgegeven door het |Koninklijk zoologisch Genootschap Natura Artis Magistra|, te Amsterdam). Amsterdam. 4. Biol. Centralbl. — Biologisches Centralblatt. Erlangen (Leipzig). 8. Boeck, Skand. Arkt. Amphip. — De Skandinaviske og Arktiske Amphipoder, beskrevne af Axel Boeck. Hefte 1,2. Christiania. 1872, 76. 4. € Bis, Crust. — Histoire naturelle des Crustaces, contenant leur Description et leurs E- Moeurs. Par L.A.G.Bosc. Tom.1,2. Paris. X [1802]. 6. F Boston J. nat. Hist. — Boston Journal of natural History. Boston. 8. f Bronn’s Kl. Ordn. — Die Klassen und Ordnungen des Thier-Reichs wissenschaftlich PB. dargestellt in Wort und Bild. Von H.G. Bronn, fortgesetzt von A. Ger- | staecker. — 5. Band. Die Klassen und Ordnungen der Arthropoden wissen- E schaftlich dargestellt in Wort undBild. VonA.Gerstaecker. Abtheilung], II. 2 Crustacea.” Leipzig und Heidelberg. 1866—79, 81—95. 8. Bull. Ace. St.- Petersb. — Bulletin de l’Acadömie Imperiale des Seiences de St.-Pöters- bourg. St.-Petersbourg. 4 (8). : Bull. Illinois Mus. — Bulletin of the Illinois State Museum of natural History. Spring- ie An 2, ei field. 4. Bull. Mus. Harvard — Bulletin of the. Masenm of comparative Zoology at Harvard Bull. Mus. Monaco —- Bulletin du Musöe oc&anographique de Monaco. Monaco. 8. Bull. Mus. Paris — Bulletin du Museum d’Histoire naturelle. Paris. 8. Bull. N. York Mus. — Bulletin of the New York State Museum. Albany. 8. Ei Bull. phys.-math. Ac. St.-Petersb. — Bulletin de la Classe physieo-mathenratique de we: l’Acad&mie Imperiale des Seiences de St.-Pötersbourg. St.-Petersbourg. 4. Bull. sei. France Belgique — Bulletin scientifique de la France et de la Belgique. Paris. 8. Bull. sei. Nord — Bulletin scientifique, historique et litteraire du Departement du E Nord et des Pays voisins (Tom. 19:] Bulletin scientifique du Nörd de la France et de la Belgique). Lille (Paris). 8. Bull. Soc. Borda — Bulletin de la Soei6t& de Borda. Dax. 8. Bull. Soc. ent. France — Bulletin des Söances et Bulletin bibliographique de la Sociste entomologique de France. Paris. 8. . Bull. Soc. ent. Ital. — Bullettino della Societä entomologiea Italiana. Firenze. 8. Bull. Soc. Etud. Paris — Bulletin de la Soci6ts d’Etudes seientifiques de Paris. Paris. 8. Er q College, in Cambridge. Cambridge, Mass., U.8. A. 8. Bull. Soc. Moscou — Bulletin de la Soeiöte Imp£riale des Naturalistes de Moscou. Moseou. 8. .Bull.’Soc. Nancy — Bulletin de la Societe des Seiences de Nancy. Nancy et Paris u: “ (Paris). 8. & Bull. Soc. Neuchatel — Bulletin de la Soeiete des Sciences naturelles de Neuchatel. Er Neuchatel. 8. *) Cfr.: ThomasR.R.Stebbing in: Rep. Voy. Challenger, 2.29 p.328, 340, 343, 372. VIII Abbreviations of the titles of literature Bull. Soc. philom. — Bulletin de la Soeiöt& philomathique de Paris. Paris. 4. Bull. Soc. Rouen — Bulletin de la SocietE des Amis des Sciences naturelles de Rouen. Rouen. 8. Bull. Soc. Vaudoise — Bulletin de la Soeiet& Vaudoise des Sciences naturelles. Lausanne. 8. Bull. Soc. zool. France — Bulletin de la Societe zoologique de France. Paris. 8. Bull. U. S. Bureau Fish. — Department of Commerce and Labor. Bulletin of the Bureau of Fisheries. Washington. 8. Bull. U. $S. Mus. — Bulletin of the United States national Museum. ya 8. Burmeister, Handb. Naturg. — Handbuch der Naturgeschichte.e Zum Gebrauch bei Vorlesungen entworfen von Hermann Burmeister. Berlin. 1837. 8. Carus, Prodr. F. Medit. — Prodromus Faunae Mediterraneae sive Deseriptio Animalium Maris Mediterranei Incolarum quam comparata Silva Rerum quatenus innotuit adiectis Locis et Nominibus vulgaribus eorumque Auctoribus in Commodum Zoologorum congessit Julius Vietor Carus. Vol. 1, 2. Stuttgart. 1885 (1884, 85), 89—93 (1889, 90, 98). 8. Costa, Deser. 3 Crost. dal Hope — Achille Costa, Deawizione di tre nuovi Crostacei del Mediterraneo discoperti dal Rev. G. F. Hope. Estratta dal Fascicolo 83° della Fauna del Regno di Napoli. [Napoli.] [1853.] 4 Costa, Fauna Reg. Napoli — Fauna del Regno di Napoli ossia Enumerazione di tutti gli Animali che abitano le diverse Regioni di questo Regno e le Acque che le bagnano ... di Oronzio-Gabriele Costa. [Continuato da Achille Costa.] — Crostacei ed Aracnidi. Napoli. 1836 (1836—51). 4. ©.-R. Ac. Sei. — Comptes rendus hebdomadaires des Söances de l’Acad&mie des Sciences. Paris. 4. ©.-R. Ass. Frang. — Association Francgaise pour l’Avancement des Sciences. Compte rendu de la... Session. Paris. 8. Cuvier, Rögne an., ed.3 — Le Regne animal distribu& d’apr&s son Organisation, pour servir de Base & l’Histoire naturelle des Animaux, et d’Introduetion ä l’ Anatomie comparee, par Georges Cuvier. [3.] Edition accompagnee de Planches gravees,... par une R&union de Disciples de Cuvier. — Les Crustae6s. Avec un Atlas, par [Henri] Milne Edwards. Paris. [1836—49.] 4. Cuvier, Rögne an., n. ed. — Le Regne animal distribu& d’apr&s son Organisation, pour servir de Base ä& l’Histoire naturelle des Animaux et d’Introduction a P Anatomie compar&e. Par [Georges] Cuvier. Nouvelle Edition, revue et augmentee. [Tom.4&5:] Par [Pierre Andrö] Latreille. Tom. 1—5. Paris. 1829, 29, 30, 29, 29. 8. Danske Selsk. Afh. — Det Kongelige Danske Videnskabernes Selskabs naturviden- skabelige og mathematiske Afhandlinger. Kjöbenhavn. 4. Danske Selsk. Skr. — Det Kongelige Danske Videnskabernes Selskabs Skrifter. — [Raekke 5 & sequ.:] Naturvidenskabelig og mathematisk Afdeling. Kjöbenhavn. 4. De Kay, Zool. N.-York — Zoology of New-York, or the New-York Fauna; eomprising detailed Desceriptions of all the Animals hitherto observed within the State of New-York, with brief Notices of those occasionally found near its Borders, and accompanied by appropriate Illustration. By James E. De Kay. — Part 6. Crustacea. Albany. 1844. 4. Denk. Ak. Wien — Denkschriften der Kaiserlichen Akademie der Wissenschaften. — Mathematisch-naturwissenschaftliche Classe. Wien. 4. Deser. Egypte — Description de V’Egypte, ou Reeueil des Observations et des Recherches qui ont &t& faites en Feypte pendant l’Expedition de l’Armöe Francaise, publi& par les Ordres de sa Majest& l’Empereur Napolöon le Grand. — Histoire naturelle.. Tom. lı—lıv, 2; Planches. Paris. 1809 [1809-27], 13 [1818, 29]*). 4&2. Desmarest, Consid. gen. Crust. — Considerations generales sur la ÖOlasse des Crustac6s, et Description des Especes de ces Animaux, qui vivent dans la Mer, sur les Cötes, ou dans les Eaux douces de la France. Par Anselme-Gaetan Desmarest. Paris, Strasbourg. 1825. 8. *) Ofr.: C. Davies Sherborn in: .P. zool. Soe. London, 1897 p. 285. u ee as ee ee u En a et a Abbreviations of the titles of literature IX Diet. Sei. nat. — Dietionnaire des Sciences naturelles, „... Par plusieurs Professeurs du Jardin du Roi, et des prineipales Ecoles de Paris. [Red. par F. Cuvier.] Tom. 1—60; Planches. Strasbourg et Paris (Paris). 1816-30. 8. Dijmphna Udb. — Disusbue-Topieie zoologisk-botaniske Udbytte. Udgivet..... af Kjebenhavns Universitets zoologiske Museum ved Chr. Fr. Lütken. Kjeben- havn. 1887. 8. Edinb. Enc. — The Edinburgh Eneyelopaedia; eondueted by David Brewster. With the Assistance of Gentlemen eminent in Seience and Literature. Vol. 1—18. Edinburgh. 1830 [1809—31]. 4. Enc. Brit., ed. 5 — The Encyelopaedia Britannica, a Dietionary of Arts, Seiences, and general Literature. Fifth Edition. Vol. 1—20; Suppl. 1--6. Edinburgh. 1814—17; 16—24. 4. Enc. meth. — Eneyelopedie methodique, ou par Ordre de Matieres; par une Soeidt6 de Gens de Lettres, de Savans et d’Artistes. — Histoire naturelle. Tom. 4—10: Inseetes (Entomologie). Paris, Liege (Paris). 1789, 90, 91, 92, 1811 [& 1812vu], 19 [& 1824vu], 25 [& 1828].*) 4. Expl. Algerie — Exploration scientifique de l’Algerie pendant les Annees 1840, 41, 42. Publi6ee par Ordre du Gouvernement et avec le Coneours d’une Commission academique. — Sciences physiques. Zoologie. I—-IV. Histoire naturelle des Animaux articulös par H. Lucas. Partiel—3; Atl. Paris. 1849 [1845—49]. 4 Exp. Mor&e — Expedition scientifique de Moree. Section des Seiences physiques. — Tom. 3. Partie I. Zoologie. Cum Atl. Paris. 1836 (1832, 33); 31l—35. 4&2. Expl. Tunisie — Exploration scientifique de la Tunisie, publi6e sous les Auspices du Ministere de Y’Instruction publique. —- Zoologie. Etude sur les Crustac&s terrestres et fluviatiles recueillis en Tunisie en 1883, 1884 et 1885 par A. Letourneux, M. Sedillot et Valery Mayet. Par Eugene Simon. Paris. 1886. 8. Fabrieius, Ent. syst. — Joh. Christ. Fabrieii Entomologia systematica emendata et aucta. Secundum Classes, Ordines, Genera, Species adjectis Synonimis, Loeis, Observationibus, Descriptionibus. Tom. 1—4. [Cum Ind.:] Index alphabetieus in J.C.Fabrieii Entomologiam systematicam, emendatam et auetam, Ordines, Genera et Species continens. [Cum Suppl.:] Joh. Christ. Fabrieii Supple- mentum Entomologiae systematicae. [Cum Ind. Suppl.:] Index alphabeticus in J. C. Fabrieii Supplementum Entomologiae systematicae, Ordines, Genera et Species continens. Hafniae. 1792, 93, 93/94, 94; 96; 98; 99. 8. Fabricius, Fauna Groenl. — Fauna Groenlandica, systematice sistens Animalia Groen- landiae oceidentalis hactenus indagata, ... secundum proprias Observationes Öthonis Fabrieii. Hafniae et Lipsiae. 1780. 8. Fabricius, Gen. Ins. — Ioh. Christ. Fabrieii Genera Inseetorum eorumque Characteres naturales secundum Numerum, Figuram, Situm et Proportionem omnium Partium Oris adiecta Mantissa Speeierum nuper deteetarum. Chilonii. [1777.] 8. Fabricius, Reise Norweg. — Johann Christian Fabrieius Reise nach Norwegen mit Bemerkungen aus der Naturhistorie und Oekonomie. Hamburg. 1779. 8. Fabricius, Spec. Ins. — loh. Christ. Fabrieii Speeies Insectorum exhibentes eorum Differentias speeificas, Synonyma Auctorum, Loca natalia, Metamorphosin adiectis Observationibus, Deseriptionibus. ‘Tom. 1,2. Hamburgi et Kilonii. 1781. 8. Fabricius, Syst. Ent. — Io. Christ. Fabrieii Systema Entomologiae, sistens Inseetorum Classes, Ordines, Genera, Species, adieetis Synonymis, Locis, Deseriptionibus, Observationibus. Flensburgi et Lipsiae. 1775. 8. Fauna Haw. — Fauna Hawaiiensis, or the Zoology of the Sandwich (Hawaiian) Isles. Being Results of the Explorations instituted by the joint Committee appointed by the Royal Society of London for promoting natural Seience and the British Association for the Advancement of Seience and carried on with the Assistance of those Bodies and the Trustees of the Bernice Pauahi Bishop Museum at Honolulu. Edited by D. Sharp. Vol. 1-3. Cambridge. 1899--1904. 4. *) Ofr.: C. Davies Sherborn & B. B. Woodward in: P. zool. Soe. London, 1893 p.583 & 1899 p. 595. x Abbreviations of the titles of literature Fedtschenko, Turkestan — Ilyremecrsie #5 Typrecrans yrena-ochoBarera Übmecrsa A. II! Dexueuko, copepmeHnnoe 0Tb Hmneparopcraro Oömecrsa Joöurerei Ecrecrposuania no llopyuenim Typkecranckaro T'renepars-I'y6epsaropa K. II. ®ous-Kaydmana. [Die Reise Fedtschenko’s in Turkestan, auf Ver- anlassung des General-Gouverneurs K. P. v. Kauffmann herausgegeben von der Kaiserlichen Gesellschaft der Freunde der Naturwissenschaften zu Moskau.] — Tom. II. 3ooreorpabuyeckia Hacataozania. [Zoogeographische Untersuchungen.] Macrs III. Paroo6pasusia, Crustacea, o6padorarns. B. H. Yasauuue. [W. N. Uljanin.] Terpans 1. C.-Ierepöyprz, Mocksa. 1875. 4. [& in: Izv. Obshch. Moskov., v.11 nr. 6.] Feuille Natural. — Feuille des jeunes Naturalistes. Paris. 8. F. Fl. Neapel — Fauna und Flora des Golfes, von Neapel und der angrenzenden Meeres-Abschnitte herausgegeben von der Zoologischen Station zu Neapel. — 20. Monographie. Gammarini del Golfo di Napoli. Monografia di Antonio. Della Valle. Con Atl. Berlin. 1893. 4. Forbes, Nat. Hist. Sokotra — The natural History of Sokotra and Abd-el-Kuri. Being the Report upon the Results of the Conjoint Expedition to these Islands in 1898—9, by W. R. Ogilvie-Grant, of the British Museum, and H. O. Forbes, of the Liverpool Museums, together with Information from other available Sources. Forming a Monograph of the Islands. Edited by Henry O0. Forbes. Liverpool, London. 1903. 8. Forh. Selsk. Christian. —- Forhandlinger i Videnskabs-Selskabet i Christiania. Chri- stiania. 8. Forh. Skand. Naturf. — Forhandlinger ved de Skandinaviske Naturforskeres. Göthe- borg (...). 8. Frey & Leuckart, Wirbell. Th. — Beiträge zur Kenntnis wirbelloser Thiere Pr be- sonderer Berücksichtigung der Fauna des Norddeutschen Meeres. Von Hleihich, Frey und Rudolf Leuckart. Braunschweig. 1847. 4. Gardiner, Fauna Mald. Laccad. — The Fauna and Geography of the Maldive and Laccadive Archipelagoes. Being the Account of the Work carried on and of the Collections made by an Expedition during the Years 1899 and 1900. Edited by J. Stanley Gardiner. Vol.1,2. Cambridge. 1903 (1901, 02, 03), 08—05. 4. Gay, Hist. Chile — Historia fisica y politica de Chile segun Documentos adquiridos ... y publicada bajo los Auspicios del supremo Gobierno por Claudio Gay. — Zoologia. Tom. 1—8; Atl. Paris. 1847--54. 8&2. Geer, M&m. Hist. Ins. — M&moires pour servir ä& l’Histoire des Inseetes. Par Charles de Geer. Tom. 1-—-7. Stockholm. 1752, 71, 73, 74, 75, 76, 78. 4. Gervais & Beneden, Zool. med. — Zoologie mödicale. Expos& möthodique du Regne animal bas& sur l’Anatomie, l’Embryogenie et la Palöontologie eomprenant la Description des Esp&ces employ&es en Medecine de celles qui sont veni- meuses et de celles qui sont Parasites de ’Homme et des Animaux par Paul Gervais [et] P.-J. van Beneden. Tom. 1, 2. Paris, Londres, New-York. 1859. 8. Gmelin, Gen. Syst. Nat. — A general System of Nature, through the tür grand Kingdoms of Animals, Vegetables and Minerals. Translated from Gmelin’s last Edition of the celebrated Systema Naturae by Sir Charles Linne. Amended and enlarged by the Improvements and Discoveries of later Naturalists and Societies, with appropriate Copper-Plates, by William Turton. — Vol. 1—7. London. 1806. 8. Gmelin, Syst. Nat. — Caroli a Linn& Systema Naturae per Regna tria Naturae, secundum Classes, Ordines, Genera, Species, eum Characteribus, Differentiis, Synonymis, Loeis. Editio XIII, aucta, reformata. Cura Jo. Frid. Gmelin. — Tomus I. Pars 1—7. Lipsiae. 1788 [Pars 6 & 7: 1791]. 8. @osse, Man. mar. Zool. — A Manual of marine Zoology for the British Isle. By Philip Henry Gosse. Part 1,2. London. 1855, 56. 12. Gosse, Rambles Devonsh. — A Naturalist's Rambles on the Devonshire Coast. By Philip Henry Gosse. London. 1853. 8. EN gaben ur on Ach u en a Le ET any a ar me nina mi A lin u le az Abbreviations of the titles of literature XI Grube, Ausfl. Triest — Ein Ausflug nach Triest und dem Quarnero. Beiträge zur Kenntniss der Thierwelt dieses Gebietes von Adolph Eduard Grube. Berlin. 1861. 8. Grube, Lussin — Die Insel Lussin und ihre Meeresfauna. Nach einem sechswöchentlichen Aufenthalte geschildert von Adolf Eduard Grube. Breslau. 1864. 8. Guerin- Möneville, Iconogr. Reögne an. — Ieonographie du Regne animal de G. Cuvier, ou Representation d’apr&s Nature de l’une des Especes les plus remarquables et souvent non encore figurees, de chaque Genre d’Animaux, Avec un Texte deseriptif mis au Courant de la Science. Par F. E. Gu&rin-Möneville. Tom. 1—3. Paris, Londres. 1829-44. 4 (& 8). Hansen, Choniostom. — The Choniostomatidae. A Family of Copepoda, Parasites on Crustacea Malacostraca. By H.J. Hansen. Copenhagen. 1897. 4. Harriman Alaska Exp. — Harriman Alaska Expedition. With Cooperation of Washington Academy of Sciences. Alaska. — Vol. 10. Crustaceans. By Mary J. Rathbun, Harriet Richardson, S.J. Holmes, and Leon J. Cole. New York. 1904. 8. Haswell, Cat. Austral. Crust. — The Australian Museum Sydney. Catalogue of the Australian stalk- and sessile-eyed Crustacea. By William A. Haswell. Sydney- 1882.- 8. Herbst, Naturg. Krabben Krebse — Versuch einer Naturgeschichte der Krabben und Krebse nebst einer systematischen Beschreibung ihrer verschiedenen Arten von Johann Friedrich Wilhelm Herbst. Band 1—3. Berlin und Stralsund. 1790 (1782-90), 96 (1791-96), 99—1804. 4&2. Herdman, Rep. Ceylon Pearl Fish. — Report to the Government of Ceylon on the Pearl Oyster Fisheries of the Gulf of Manaar, by W.A. Herdman. With supplementary Reports upon the marine Biology of Ceylon, by other Naturalists. Published.... by the Royal Soeiety. Part 1, 2. London. 1903, 04. 4. Herrmannsen, Ind. Gen. Malac. — Indieis Generum Malacozoorum Primordia. Nomina Subgenerum, Generum, Familiarum, Tribuum, Ordinum, Classium; adjectis Auetoribus, Temporibus, Loeis systematicis atque literariis, Etymis, Synonymis. Praetermittuntur Cirripedia, Tunieata et Rhizopoda. Conseripsit A.N. Herr- mannsen. Vol.1,2. Cassellis. 1846, 47—49. 8. Hist. An. artie — Histoire naturelle des Animaux artieules, Annelides, Crustac6s, - Arachnides, Myriapodes et Insectes. — Histoire naturelle des Crustaces, des Arachnides et des Myriapodes, par [Hippolyte! Lucas. . Paris. 1840. 8. Hope, Cat. Crost. Ital. — Catalogo dei Crostacei Italiani e di molti altri del Mediterraneo per Fr. Gugl. Hope. Napoli. 1851. 8. Horae Soc. ent. Ross. — Horae Soeietatis entomologieae Rossicae. Petropoli. 8. Huxley, Man. Anat. Invert. — A Manual of the Anatomy of invertebrated Animals by Thomas H. Huxley. London. 1877. 8. J. Ac. Philad. — Journal of the Academy of natural Sciences of Philadelphia. Phila- delphia. 8(4). Jahrb. Hamburg. Anst. — Jahrbuch der Hamburgischen wissenschaftlichen Anstalten. Hamburg. 8. Jahresber. Comm. D. Meere — Jahresbericht der Commission zur wissenschaftlichen Untersuehung der Deutschen Meere in Kiel. Berlin. 2. Jahresber. Ges. Hannover — Jahresbericht der naturhistorischen Gesellschaft zu Hannover. Hannover. 8. Jahresber. Schles. Ges. — Jahres-Bericht der Schlesisechen Gesellschaft für vaterländische Cultur. Breslau. 4, 8. J. Asiat. Soc. Bengal — Journal of the Asiatie Society of Bengal. — [Vol. 34 & sequ.:] Part II, Natural History ete. Caleutta. 8. J. Linn. Soc. — The Journal of the Linnean Society. — Zoology. London. 8. Jurinac, Fauna Kroat. Karst. — Ein Beitrag zur Kenntnis der Fauna des Kroatischen Karstes und seiner unterirdischen Höhlen. Von Adolf E. Jurinae. Jena. 1888. 8. Xu Abbreviations of the titles of literature Koch, ©. M. A. — C.1L. Koch, Deutschlands Crustaceen, Myriapoden und Arachniden. Ein Beitrag zur Deutschen Fauna. Herausgegeben von [Gottlieb August Wilhelm] Herrich-Schäffer. Heft 1-40. Regensburg. 1835—44. 16. Kossmann, Reise Roth. Meer. — Zoologische Ergebnisse einer im Auftrage der Königlichen Academie der Wissenschaften zu Berlin ausgeführten Reise in die Küsten- gebiete des Rothen Meeres. Herausgegeben mit Unterstützung ... von Robby Kossmann. 1. Hälfte. 2. Hälfte, I. Lieferung. Leipzig. 1877, 80. 4. Lamarck, Hist. An. s. Vert. — Histoire naturelle des Animaux sans Vertebres, prösentant les Caracteres göneraux et partieuliers de ces Animaux,...; pr&cedee d’une Introduetion ... Par [Jean Baptiste] de Lamarck. Tom. 15, 6ı&ım, 7. Paris. 18151m, 1611, 16vım, 17nı, 18vı, 19n—vı, 221v, 22vım. 8. Lamarck, Hist. An. s. Vert., ed. 2 — Histoire naturelle des Animaux sans I SIEDERE presentant les Caractäres generaux et particuliers de ces Animaux,. pröcödee d’une Introduetion.... Par J. B. P. A.de Lamarck. 2. Haition. Revue et augmentee de Notes pressntant les Faits nouveaux dont la Science s’est enrichie jusqu’a ce Jour; par G. P. Deshayes et H. Milne Edwards. Tom. 1—11l. Paris. 1835—45. 8. Latreille, Gen. Orust. Ins. — P. A. Latreille Genera Crustaceorum et Inseetorum seeundum Ordinem naturalem in Familias disposita, Iconibus Exemplisque plurimis explicata. Tom. 1—4. Parisiis et Argentorati. 1806, 07, 07, 09. 8. Latreille, Hist. Crust. Ins. — Histoire naturelle, gönörale et partieuliere, des Crustacös et des Inseetes. Ouvrage faisant Suite aux Oeuvres de Leclere de Buffon, et Partie du Cours eomplet d’Histoire naturelle redig& par C. S. Sonnini. Par P. A. Latreille. Tom. 1—14. Paris. X—XIII [1802—1805]. 8. Leach, Zool. Misc. — The zoological Miscellany; being Descriptions of new, or inter- esting Animals, by William Elford Leaeh. Illustrated with coloured Figures, drawn from Nature, by R.P. Nodder. Vol.1—3. London. 1814, 15, 17. 8. Linne, Fauna Svec., ed.2 — Caroli Linnaei Fauna Svecica sistens Animalia Sveciae Regni: Mammalia, Aves, Amphibia, Pisces, Inseeta, Vermes. Distributa per Ulasses & Ordines, Genera & Speeies, cum Differentiis Specierum, Synonymis Auetorum, Nominibus Incolarum, Locis Natalium, Deseriptionibus Inseetorum. Editio altera, aucetior. Stockholmiae. 1761. 8. Linne, Syst. Nat., ed. 10 -— Caroli Linnaei Systema Naturae per Regna tria Naturae, sind Classes, Ordines, Genera, Species, cum Characteribus, Differentiis, Synonymis, Ele Editio X, $eleriante — Tomus I. Holmiae. 1758. 8. Linne, Syst. Nat., ed. 12 — Caroli aLinn& Systema Naturae per Regna tria Naturae, secundum Classes, Ordines, -Genera, Species, cum Characteribus, Differentiis, Synonymis, Locis. Editio XII, reformata. — Tomus I. Pars 1,2. Holmiae. 1766, 67. 8. List Brit. An. Brit. Mus. — List of the Specimens of British Animals in the Collection of the British Museum. — Part 4. Crustacea. [By Adam White.] London. 1850. 12. Mag. nat. Hist. — The Magazine of natural History, and Journal of Zoology, Botany Mineralogy, Geology, and Meteorology. London. 8. Mag. Zool. — Magasin de Zoologie |[Ser. 2:], d’Anatomie compar&e et de Palöontologie|. Paris. 8. Mandt, Observ. Groenl. — Observationes in Historiam naturalem et Anatomiam com- paratam in Itinere Groenlandico faetae. Dissertatio inauguralis, quam . Die XXI. M. Julii A. 1822 publice defendet Auctor Martinus Guilelmus Mandt. [Berolini.] 1822. 8. Marschall, Nomenel. zool. — Nomenelator zoologiens continens Nomina systematica Generum Animalium tam viventium quam fossilium, seeundum Ordinem alphabeticum disposita. Conseriptus a Comite Augusto de Marschall. Vindobonae. 1873. 8. Mem. Acc. Napoli — Memorie della Reale Accedernie delle Seienze dal 1852 in avant. Napoli. 4. Mem. Acc. Verona — Memorie dell’ Accademia a erivolhurk Commereio ed Arti di Verona. Verona. 8. Abbreviations of the titles of literature XII Mem. Ac. Washington — Memoirs of the national Academy of Sciences. Washington. 4. Mem. Boston Soc. — Memoirs read before the Boston Society of natural History, being a new Series of the Boston Journal of natural History. Boston. 4. Mim. cour. Ac. Belgique — Mömoires couronnes et M&moires des Savants ötrangers, publies par l’Acad&mie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Bruxelles. 4. Mem. Ist. Veneto — Memorie del Reale Istituto Veneto di Seienze, Lettere ed Arti. Venezia. 4. Mm. pres. Ac. St.-Pötersb. — M&moires presentes ä l’Acad&mie Imp6riale des Seiences de Saint-Pötersbourg, par divers . Savants, et lus dans ses Assemblees. St.-Pötersbourg. 4. Mm. Soc. Geneve — Mömoires de la Societ& de Physique et d’Histoire naturelle de Genöve. Genöve. 4. Mm. Soc. Kiew — Mömoires de la Soeiete des Naturalistes de Kiew. 3anueru Kiesckaro O6meersa Ecrecrpoucnsirarerei. Kiew. Kiers. 8. Mem. Soc. zool. France — M&moires de la Soeiete zoologique de France. Paris. 8. Middendorff, Reise Sibirien — Reise in den äussersten Norden und Osten Sibiriens während der Jahre 1843 und 1844 mit allerhöchster Genehmigung auf Ver- anstaltung der Kaiserlichen Akademie der Wissenschaften zu St. Petersburg ausgeführt und in Verbindung mit vielen Gelehrten herausgegeben von A. Th. v. Middendorff. — Band 2. Zoologie. Theil I, II. St. Petersburg. 1851, 53. 4. Miers, Cat. Crust. N. Zealand — Colonial Museum and geological Survey Department .... Catalogue of the stalk- and sessile-eyed Crustacea of New Zealand. By Edward J. Miers. : London. 1876. 8. Milne Edwards, Hist. nat. Crust. — Histoire naturelle des Urustacös, eomprenant l’Anatomie, la Physiologie et la Classification de ces Animaux; par [Henri] Milne Edwards. Tom. 1-3; Planches. Paris. 1834, 37, 40. 8. Müller, Für Darwin — Für Darwin von Fritz Müller. Leipzig. 1864. 8. Müller, Zool. Dan., ed.3 — Zoologia Danica seu Animalium Daniae et Norvegiae rariorum ac minus notorum Desecriptiones et Historia. Auctore Othone „‚Friderico Müller. Ad Formam Tabularum denuo edidit Frater Auctoris “vol. 3:] Deseripsit et Tabulas addidit Petrus Christianus Abildgaard) ([Vol. 4:] Deseripserunt et Tabulas dederunt P.C. Abildgaard, M.Vahl, J.S.Holten, J.Rathke). [Editio 3.] Vol. 1-4. Havniae. 1788, 88, 89, 1806. 2. Nachr. Ges. Götting. — Nachrichten von der Königl. Gesellschaft der Wissenschaften und der Georg- Augusts-Universität zu Göttingen. Göttingen. 8. N. Acta Ac. Leop. — Nova Acta Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum. Verhandlungen der Kaiserlichen Leopoldinisch-Caro- linischen Akademie der Naturforscher. Norimbergae (Erlangen ete.). 4. N. Acta Soc. Upsal. — Nova Acta Regiae Soeietatis Scientiarum Upsaliensis. Upsaliae. 4. Nansen, Norweg. North Polar Exp. — The Norwegian North Polar Expedition 1893— 1896. Seientifie Results. Edited by Fridtjof Nansen. Vol.1—6. London, Christiania, New York, Bombay, Leipzig. 1900—05. 4. Nardo, Prosp. Fauna Venet. — Prospetto della Fauna marina volgare del Veneto Estuario eon Cenni sulle prineipali Specie commestibili dell’ Adriatico, ecc. del Gio. Domenico Nardo. Estratto dall’ Opera: Venezia e le sue Lagune. Venezia. 1847. 4. Nardo, Sinon. Spee. Chiereghini — Sinonimia- moderna delle Speeie registrate nell’ Opera intitolato: Deserizione de’ Crostacei, de’ Testacei e de’ Pesci che abitano le Lagune e Golfo Veneto, rappresentati in Figure a Chiaroseuro ed a Colori dall’ Abate Stefano Chiereghini. Applicata per Commissione governativa dal Gio. Domenico Nardo. Venezia. 1847. 8. Nares, Voy. Polar Sea — Narrative of a Voyage to the Polar Sea during 1875—6 in H. M. Ships “Alert and “Diseovery by G. S. Nares. With Notes on the natural History, edited by H. W. Feilden. Vol. 1, 2. London. 1878. 8. Nat. Hist. Rev. — The natural History Review. A quarterly Journal. London. 8. XIV Abbreviations of the titles of literature Nat. Hist. Tr. Northumb. — Natural History Transaetions of Northumberland and Dur- ham and Neweastle-upon-Tyne|, being Papers read at the Meetings of the natural History Soeiety of Northumberland, Durham and Neweastle-upon- Tyne, and the Tyneside Naturalists’ Field Club. London (Newcastle). 8. Nat. Sci. — Natural Science. A monthly Review of seientifie Progress. London & New York (London). 8. Naturaliste — Le Naturaliste. Paris. 4. Naturh. Tidsskr. — Naturhistorisk Tidsskrift. Kjebenhavn. 8. Niederl. Arch. Zool. — Niederländisches Archiv für Zoologie. Haarlem, Leipzig (Leiden, Leipzig). 8. N. Mem. Soc. Moscou — Nouyeaux M&moires de la Soeciet& Imperiale des Naturalistes de Moscou. Moscou. 4. Norman & Scott, Crust. Devon Cornwall — The Crustacea of Devon and Cornwall by Canon A. M. Norman and Thomas Seott. London. 1906. 8. Norske Nordhavs- Exp. — Den Norske Nordhavys-Expedition 1876—1878. 'I'he Norwegian North-Atlantic Expedition 1876—1878. — 6. Bind (Volume). XIV & XV. Crustacea, I& II. Ved (By) G.O.Sars. Christiania. 1885, 86. 4. Norske Selsk. Skr. — Det Kongelige Norske Videnskabers-Selskabs Skrifter i det 19de Aarhundrede. Throndhjem. 4 (8). Nowv. Diet., ed.2 — Nouveau Dietionnaire d’Histoire naturelle, appliquöe aux Arts, & l’Agriculture, & ’Eeonomie rurale et domestique, ä la Medeeine, etc. Par une Soeiste de Naturalistes et d’Agrieulteurs. Nouvelle Edition. Tom. 1—6, 7—18, 19—27, 28—86. Paris. 1816, 17, 18, 19. 8. Nyt Mag. Naturv. — Nyt Magazin for Naturvidenskaberne. Christiania.- 8. N. Zealand J. Sci. — The New Zealand Journal of Science. Dunedin. 8. . Öfv. Ak. Förh. — Öfversigt af Kongl. Vetenskaps-Akademiens Förhandlingar. Stock- holm. 8. Ov. Danske Selsk. — Oversigt over det Kongelige Danske Videnskabernes Selskabs Forhandlinger og dets Medlemmers Arbeider. Kjöbenhavn. 4 (8). P. Ac. Philad. — Proceedings of the Academy of natural Seiences of Philadelphia. Philadelphia. 8. Pallas, Mise. zool. — P.S. Pallas, Miscellanea zoologiea quibus novae imprimis atque obscurae Animalium Species deseribuntur et Observationibus Iconibusque illustrantur. Hagae Comitum. 1766. 4. Pallas, Reise Ruß. — P.S. Pallas Reise durch verschiedene Provinzen des Rußischen Reichs. Theil 1—3. St. Petersburg. 1771, 73, 76. 4. (2. Auflage: 1. Theil. St. Petersburg. 1801. 4.) Pallas, Spie. zool. — Spicilegia zoologica quibus novae |imprimis| et obseurae Ani- malium Species Iconibus, Deseriptionibus atque Commentariis illustrantur. Cura P.S. Pallas. Fascieulus 1—14. Berolini. 1767—80. 4. P. Amer. Ac. — Proceedings of the American Academy of Arts and Seiences. Boston and Cambridge. 8. Pam. Fizyjogr. — Pamietnik Fizyjografiezny. Warszawa. 4. Pap. Boston Soc. — Occasional Papers of the Boston Society of natural History. Boston. 8. Parry, J. third Voy. — Journal of a third Voyage for the Diseovery of a North-West Passage from the Atlantie to the Pacific; performed in the Years 1824—25, in His Majesty’s Ships Hecla and Fury, under the Orders of Captain William Edward Parry. London. 1826. 4. Parry, J. Voy. — Journal of a Voyage for the Discovery of a North-West Passage from the Atlantie to the Pacific; performed in the Years 1819—20, in His Majesty’s Ships Hecla and Griper, under the Orders of William Edward Parry. With an Appendix, containing the scientific and other Observations. [Cum Suppl.:] Appendix X, natural History (A Supplement to the Appendix of Captain Parry’s Voyage for the Discovery of a North-West Passage, in the Years 1819—20. Containing an Aceount of the Subjects of natural History). London. 1821, 24. 4. TE RER, | \ | Abbreviations of the titles of literature XV -P. Calif. Ac. — Proceedings of the California Academy of Sciences. —- [Ser. 3:] Zoology. San Francisco. 8. P. Dublin Univ. zool. bot. Ass. — Proceedings of the Dublin University zoological and botanical Association. Dublin. 8. Pennant, Brit. Zool., ed. 4 — British Zoology. [Preface:] Thomas Pennant. 4. Edition. Vol. 1-4. Warrington (London). 1776, 77. 8. Pennant, Brit. Zool., ed. 5 — British Zoology, a new [d.] Edition. Vol. 1—4. London. 1812. 8. Philippi, Reise Atacama — Reise durch die Wüste Atacama auf Befehl der Chilenischen Regierung im Sommer 1853—54 unternommen und beschrieben von Rudolph Amandus Philippi. Halle. 1860. 4. Phil. Tr. — Philosophical Transaetions of the Royal Society of London. London. 4. Phipps, Voy. North Pole — A Voyage towards the North Pole undertaken by his Majesty’s Command 1773 by Constantine John Phipps. London. 1774. 4. P. Linn. Soc. N. S. Wales — The Proceedings of the Linnean Society of New South Wales. Sydney. 8. P. Liverp. biol. Soc. — Proceedings |[Vol. 4 & sequ.:] and Transaetions| of the Liverpool biologieal Society. Liverpool. 8. P. nat. Hist. Soc. Glasgow — Proceedings |and Transaetions |of the natural History Society of Glasgow. Glasgow. 8. 2 phys. Soc. Edinb. — Proceedings of the Royal physical Society of Edinburgh. Edinburgh. 8. Pratz, Grundw. Thiere — Über einige im Grundwasser lebende Thiere. Beitrag zur Kenntnis der unterirdischen Crustaceen. Dissert. inaug. E. Pratz. Peters- burg. 1866. 8. P. R. Soc. Edinb. — Proceedings of the Royal Society of Edinburgh. Edinburgh. 8. - P. R. Soc. Tasmania — Papers and Proceedings of the Royal Society of Tasmania. Hobart. 8. P. R. Soc. Vietoria — Proceedings of the Royal Society of Vietoria. New Series. Melbourne. 8. Publ. Expl. Mer — Conseil permanent international pour l’Exploration de la Mer. Publications de Circonstance. Copenhague. 4. P. U. S. Mus. — Proceedings of the United States national Museum. Washington. 8, P. zool. Soc. London — Proceedings of the zoological Society of London. London. 8. Quart. J. geol. Soc. — The quarterly Journal of the geological Society of London. London. 8. ' Rad Jugoslav. Ak. — Rad Jugoslavenske Akademije Znanosti i Umjetnosti. Zagreb. 8. Rafinesque, Anal. Nat. — Analyse de la Nature ou Tableau de l’Univers et des Corps organises. Par C.S. Rafinesque. Palerme. 1815. 8. Rafinesque, Ann. Nat. —- Annals of Nature or annual Synopsis of new Genera and Species of Animals, Plants, ete., discovered in North America by C. S. Rafinesque. First annual Number, for 1820. Lexington. 8. Rafinesque, Preeis Decouv. somiol. — Preeis des Döcouvertes et Travaux somiologiques de Mr. ©. S. Rafinesque-Schmaltz, entre 1800 et 1814. Ou Choix raisonne de ses prineipales Decouvertes en Zoologie et en Botanique, pour servir d’Introduetion & ses Ouvrages futurs. Palerme. 1814. . 12. Ray, Hist. Ins. — Historia Inseetorum. Autore Joanne Raio. Opus posthumum Jussu Regiae Societatis Londinensis editum. COdi subjungitur Appendix de Scarabaeis Britannieis, Autore M. Lister. Londini. 1710. 4. Rec. Austral. Mus. — Records of the Australian Museum. Sydney. 8. Recu. Passage Venus — Institut de France. Acadömie des Sciences. Recueil de M&moires, Rapports et Documents relatifs & ’Observatiou du Passage de Venus sur le Soleil. — Tom. 3. Partie II. Mission de !’Ile Campbell. Cum Atl. Paris. 1885. 4. Reise Novara — Reise der Österreichischen Fregatte Novara um die Erde in den Jahren 1857,1858, 1859 unter den Befehlen des Commodore B.vonWüllerstorf- Urbair. Wissenschaftlicher Theil. — Zoologischer Theil. 2. Band. III. Ab- theilung. Crustaceen. Beschrieben von Camil Heller. Wien. 1865. 4. FR xXVI Abbreviations of the titles of literature RBend. Soc. Borbon. — Rendieonto della Societä Reale Borbonica. Accademia delle Scienze. Napoli. 4. Rep. Brit. Ass. — Report of the... Meeting of the British Association for the Advancement of Seience. London. 8. Rep. Devonsh. Ass. — Reports of the Meetings and Transactions of the Devonshire Assoeiation for the Advancement of Seience, Literature and Art. Plymouth. 8. Rep. Fish. Board Scotl. — Annual Report of the Fishery Board for Scotland. — Part II. Scientifie Investigations. Edinburgh. 8. Rep. Peabody Ac. — Annual Report of the Trustees of the Peabody Academy of Sciences. Salem. 8. Rep. U. S. Fish Comm. — United States Commission of Fish and Fisheries. Report of the Commissioner. Washington. 8. Rep. U. S. geol. Surv. Terr. — Report of the United States geologieal jand geographical| Survey of the Territories.. Washington. 4. Rep. Voy. Alert — Report on the zoological Collections made in the Indo-Paeifie Ocean during the Voyage of H.M. S. „Alert“ 1881 —2. London. 1884. 8. Rep. Voy. Challenger — Report on the scientific Results of the Voyage of H. M.S. Challenger during the Years 1873 — 76 under the Command of George S. Nares and Frank Tourle Thomson. Prepared under the Superintendence of |the late| C. Wyville Thomson jand now of John Murray]. — Zoology. Vol. 29. (Part LXVII.) Report on the Amphipoda colleeted by H. M. S. Challenger during the Years 1873-76. By Thomas R. R. Stebbing. London, Edinburgh, Dublin. 1888. 4. Result. Camp. Monaco — Re£sultats des Campagnes scientifiques accomplies sur son Yacht par Albert Ier Prince souverain de Monaco. Publies sous sa Direetion avee le Concours de Jules de Guerne (Jules Richard). — Fascieule 16. Amphipodes provenant des Campagnes de l’Hirondelle 1885 — 1888. Par Ed. Chevreux. Monaco. 1900. 4. Rev. biol. Nord France — Revue biologique du Nord de la France. Lille. 8. Rev. Sei. nat. — Revue des Scieces naturelles. Montpellier, Paris. 8. Risso, Hist. nat. Eur. merid. — Histoire naturelle des prineipales Productions de l’Europe meridionale et partieulierement de celles des Environs de Nice et des Alpes maritimes; par A. Risso. Tom. 1—5. Paris et Strasbourg. 1826. 8. Ritzema Bos, Bijdr. Crust. Hedriophthal. — Bijdrage tot de Kennis van de Urustacea Hedriophthalmata van Nederland en zijne Kusten. Akademisch Proefschrift ... door Jan Ritzema Bos. Groningen. 1874. 8. Rösel, Insecten-Belustig. — Der monathlich-herausgegebenen Insecten-Belustigung . Theil,... von August Johann Rösel von Rosenhof. Theil 1—4. Nürnberg [1746, 49], 55, 61. 4. Ross, App. sec. Voy. — Appendix to übe. Narrative of a second Voyage in Search of a North-West Passage, and of a Residence in the Arctie Regions during the Keane 1829, 30, 31, 82,33. By Sir John Ross. Inceluding the Reports of Commander, now Captain, James Clark Ross, and the Discovery of the northern magnetic Pole. London. 1835. 4. Ross, Voy. Baffin’s Bay — A Voyage of Discovery, made under the Orders of the Admiralty, in His Majesty’s Ships Isabella and Alexander, for the Purpose of exploring Baffın's Bay, and inquiring into the Probability of.a North- Western Passage. By John Ross. London. 1819. 4. Sabine, An. north. Exp. — An Account of the Animals seen by the late northern Expedition whilst within the aretic Cirele. Being No. X of the Appendix to Capt. Parry’s Voyage of Discovery. By Edward Sabine. London. 1821. 4. Samouelle, Ent. Compend. — The Entomologist’s useful Compendium; or an Introduction to the Knowledge of British Inseets. By George Samouelle. London. 1819. 8. Sars, Crust. d’Eau douce Norvege — Histoire naturelle des Orustaces d’Eau douce de Norvege. Par George Ossian Sars. 1. Livraison. Les Malacostraces Christiania. 1867. 4. Abbreviations of the titles of literature XVII "Sars, Crust. Norway — An Account of the Urustacea of Norway with short Desceriptions and Figures of all the Species by G.O.Sars. Vol. 1-4. Christiania and Copenhagen (Bergen). 1895 (1890—95), 99 (1896—9%), 1900 (1899—1900), 03 (1901—08). 4. Savigny, Mem. An. s. Vert. — Mömoires sur les Animaux sans Vertebres; par Jules- Cesar Savigny. Partie 1, 2, Paris. 1816I, 16. 8. SB. Ak. Wien — Sitzungsberichte der Kaiserlichen Akademie der Wissonsehaften. — Mathematisch-naturwissenschaftliche Classe. Wien. 8. SB. Böhm. Ges. — Sitzungsberichte der Königl. Böhmischen Gesellschaft der Wissen- ? schaften lin Prag|. — [ann. 1885 & sequ.:] Mathematisch-naturwissenschaftliche Classe. Prag. 8. £ Schr. Ges. Königsb. — Schriften der |Königlichen| physikalisch-ökonomischen Gesell- schaft zu Königsberg. Königsberg. 4. Scopoli, Ent. Carniol. — Joannis Antonii Seopoli Entomologia Carniolica exhibens Insecta Carnioliae indigena et distributa in Ordines, Genera, Species, Varietates. Methodo Linnaeana. Vindobonae. 1763. 8. Scoresby, Account arct. Regions — An Account of the aretic Regions, with a History and Description of the Northern Whale-Fishery. By William Scoresby, Jun. Vol.1,2. Edinburgh. 1820. 8. Scudder, Nomenel. zool. — Nomenclator zoologieus. An alphabetical List of all generie Names that have been employed by Naturalists for recent and fossil Animals from the earliest Times to the Close of the Year 1879. I. Supplemental - List. II. Universal Index. By Samuel H. Sceudder. Washington. 1882. 8. Slabber, Natuurk. Verlustig. — Natuurkundige Verlustigingen, behelzende microscopise Waarneemingen van in- en uitlandse Water- en Land-Dieren. Door Martinus Slabber. I-XVIII Stukje. Haarlem. 1778 (1769). 4. Slabber, Phys. Belustig. —- Physikalische Belustigungen oder mikroskopische Wahr- nehmungen in- und ausländischer Wasser- und Landthierchen. Von Martin Slabber. Aus dem Holländischen übersetzt von P.L. St. Müller. Nürnberg. 1775. 4. Smithson. Contr. — Smithsonian Contributions to Knowledge. Washington, 4. Spolia Zeyl. — Spolia Zeylanica. Issued by the Colombo Museum, Ceylon. Colombo. 8. Svenska Ak. Handl. — Kongliga Svenska Vetenskaps-Akademiens Handlingar. Stock- he holm. 8(4). Syezda Russ. Est. — Tpyasi Cpbana Pycekuxs Ecrecrsonucwirareneit. [Arbeiten der Ver- sammlung Russischer Naturforscher.] 4. Tabl. enc. meöth. — Tableau encyelopedique et möthodique des trois Rögnes de la Nature. — Crustac&s, Arachnides et Insectes, par [Pierre Andr&] Latreille. { Paris. 1818 [1797, 1818, 18—-].*) 4. Tijdschr. Nederl. dierk. Ver. — Tijdschrift der Nederlandsche dierkundige Vereeniging. s’Gravenhage (Rotterdam) (Leiden). 8. Tr. Amer. mier. Soc. — T'ransactions of the American mieroscopical Society. Buffalo. 8. Trav. Soc. St.-Pötersb. — Travaux de la Soeciet& Impöriale des Naturalistes de St.- Pötersbourg. Section de Zoologie et de Physiologie. St.-Pötersbourg. 8. Tr. Connect. Ac. — Transaetions of the Connecticut Academy of Arts and Sciences. iz en A he . BE Basen. u im am © 1 ana nal al hl uni Eu Lu bene New Haven. 8. « Tr. ent. Soc. London — The Transactions of the entomologieal Society of London. London. 8. Tr. Irish Ac. — Transactions of the Royal Irish Academy. Dublin. 4. Tr. Linn. Soc. London — The Transactions of the Linnean Society of London. : — [Ser. 2:] Zoology. London. 4. Tr. N. Zealand Inst. — Transactions and Proceedings of the New Zealand Institute. Wellington (Wellington, London). 8. *) Cfr.: C. Davies Sherborn & B. B. Woodward in: P. zool. Soe. London, 1893 p. 584. u XVII Abbreviations of the titles of literature Tromse Mus. Aarsh. — Tromse Museums Aarshefter. Tromse. 8. Tr. Tyneside Club — Transactions of the Tyneside Naturalists’ Field Club. Neweastle- upon-Tyne. 8. Trudui Kazan. Univ. — Tpyası O6wmecrsa Ecrecrzoucnsirarezei mpu Hnmn. Kasauckoms “ Vumzepcurert. Kasanp. [Arbeiten der Gesellschaft der Naturforscher an der Kais. Kasanschen Universität. Kasan.] 4 (8). Tr. zool. Soc. London — Transactions of the zoological Society of London. London. 4. Udb. Hauchs — Det videnskabelige Udbytte af Kanonbaaden „Hauchs“ Togter i de Danske Have indenfor Skagen i Aarene 1883—86. Udgivet paa Bekostning af Ministeriet... ved ©. G. Joh. Petersen. Hefte 1—5. Kjöbenhavn. 1889, 89, 90, 91, 93. 4. D. 8. expl. Exp. — United States exploring Expedition. During the Years 1838—42. Under the Command of Charles Wilkes. — Vol. 13. Part I, II. Crustacea. By James D. Dana. Cum Atl. Philadelphia. 1852, 52 [1853]; 55. 4 & 2. Vega-Exp. — Vega-Expeditionens vetenskapliga Jakttagelser. Bearbetade af Delta- gare i Resan och andra Forskare, utgifna af A. E. Nordenskiöld. Bandet 1—5. Stockholm. 1882, 83, 83, 87, 87. 8. Verh. Ges. Wien — Verhandlungen der kaiserlich-königlicehen zoologisch-botanischen Gesellschaft in Wien. Wien. 8. Verh. Ver. Rheinlande — Verhandlungen des naturhistorischen Vereines der Preußischen Rheinlande. Bonn. 8. Vetensk. Ak. Handl. — Kong]. Vetenskaps-Akademiens Handlingar. Stockholm. 8. Vid. Meddel. — Videnskabelige Meddelelser fra den naturhistoriske Forening i Kjeben- havn for Aarene.... Kjebenhavn. 8. Viviani, Phosphor. Maris — Phosphorescentia Maris quatuordeeim luceseentium Animal- ceulorum novis Speciebus illustrata a Dominico Viviani. Accedit novi eujusdam Generis, e Molluscorum Familia Deseriptio et Anatome. Genuae. 1805. 4. Voy. Nord — Voyages de la Commission seientifigque du Nord, en Scandinavie, en Laponie, au Spitzberg et aux Feröe, pendant les Annöes 1838, 39 et 40, sur la Corvette la Recherche, commandöe par Fabvre; publies par Ordre du Roi sous la Direetion de Paul Gaimard. — Zoologie. Planches. Paris. 2. : Weber, Reise Niederl. O.-Ind. — Zoologische Ergebnisse einer Reise in Niederländisch . Ost-Indien. Herausgegeben von Max Weber. Band1—4. Leiden. 1890-—97. 8. White, Crust. Brit. Mus. — [Adam White] List of the Specimens of Crustacea in the Colleetion of the British Museum. London. 1847. 12. White, Hist. Brit. Crust. — A popular History of British Crustacea comprising a familiar Account of their Classification and Habits. By Adam White. London.‘ 1857. 16. Whymper, Trav. Great Andes — Travels amongst the Great Andes of the Equator by Edward Whymper. 1Vol. & supplementary Appendix. London. 1892, 91. 8. Wiss. Meeresunters. — Wissenschaftliche Meeresuntersuchungen. Herausgegeben von der Kommission zur wissenschaftlichen Untersuchung der Deutschen Meere in Kiel und von der biologischen Anstalt auf Helgoland. Neue Folge. Kiel und Leipzig. 4. Zaddach, Syn. Crust. Pruss. — Synopseos Crustaceorum Prussieorum Prodromus. Dissertatio... Die XI. M. Decembris 1844 publice defendet Ernestus Gustavus Zaddach. Regiomonti. 1844. 4. Zool. Anz. — Zoologischer Anzeiger. Leipzig. 8. Zool. J. — The zoologiecal Journal. London. 8. Zool. Rec. — The zoological Record. London. 8. Zweite D. Nordpolarf. — Die zweite Deutsche Nordpolarfahrt in den Jahren 1869 und 1870 unter Führung des Kapitän Karl Koldewey. Herausgegeben von dem Verein für die Deutsche Nordpolarfahrt in Bremen. — 2. Band. Wissenschaftliche Ergebnisse. 8. Crustaceen. Bearbeitet von R. Buchholz. Leipzig. 1874. 8. Z. wiss. Zool. — Zeitschrift für wissenschaftliche Zoologie. Leipzig. 8. ut [An obelisk 7 Bubhinodsa .. ....: . ı I. Leg. Gammaridea . 5 - 1.Fam. Lysianassidae . . 8 1.Gen. Kerguelenia Stebb. . . 11 .1. K. compacta Stebb. . . . 12 2. „ borealis'O. Sars . . . .. 12 2,Gen. Trischizostoma Boeck 12, 717 1. T. nicaeense (A. Costa) 18, 717 3.Gen. Acidostoma Lili. . . 14 E 1. A. obesum (Bate) . ... 14 2 „ laticorne O0. Sars . . . 14 E 4.Gen. Acontiostoma Stebb. . 15 F 1. A. marionis Stebb.. . ... 25 E 2. „ magellanicum Stebb. . 15 4 5.Gen.Stomacontion Stebb. . 16 3 1. S. pepinii (Stebb) - . . . 16 7 6.Gen.Hirondellea Chevreux . 16 ’ 1. H. trioculata Chevreux . . 17 m 7.Gen. Podoprionella O. Sars . 17 1. P. norvegiea O.Sars. .. 177 8.Gen.Podoprion Chevreux . 18 1. P. bolivari Chevreux . . . 18 9,Gen.Euonyx Norm. ....1 1. E. chelatus Norm. . . . . 19 er 2 „ nomani Stebb. . 129 10.Gen. Opisa Boeck . . ER! 1. ©. eschrichtii Kia) a 11.Gen.Sophrosyne Stebb. . . 21 > 1. S. murrayi Stebb.. . . . 21 2. „ robertsoni ® Stebb. &D. Roberts. . . 21 3. „ hispana (Chevreux) . .22, 717 12.Gen. Valettia Stebb. . . . 22 1. V. coheres Stebb. » . . . 2 12*.Gen. Vijaya A. Walker 717 1. V. tenuipes A. Walker 717 Systematic Index. signifies that the generic or speeifie name is new.] 13.Gen. Amaryllis Hasw. . 1. A. haswelli Stebb. . 2. „ macrophthalma Hasw. 3. „ bathycephala Stebb. . . „ pulchella Bonnier . 14.Gen. Onisimus Boeck O. edwardsii (Kroyer) . „ plautus (Kreyer) . „ normani (O. Sars) . turgidus (O. Sars) . „ earicus H. J. Hansen . „ leucopis (O. Sars) . „ affinis H. J. Hansen . . ae 15. Gen. Cyphocaris Boeck . . 28, 1. C. challengeri Stebb. . „ anonyxX Boeck „ richardi Chevreux „ alicei Chevreux . 15*.Gen. Paracyphocaris Cheyreux 1; P: praedator Ohswrene 16.Gen. Cyclocaris Stebb. . . 1. ©. tahitensis Stebb. > go 10 2. „ guilelmi Chevreux . 31, 16*,Gen.Lysianopsis S.J. Holmes 1. L. alba S.T. Holmes . 17.Gen.Lysianella O. Sars 1. L. petalocera O. Sars . 2. „ dellavallei Stebb.+ . 18.Gen. Onesimoides Stebb. . 1. O. carinatus Stebb.. - - » 19.Gen. Pseudalibrotus Della a er 1. P. litoralis (Kreyer) . . 2. „ caspius O. Sarsı .... . II* page „ brevicaudatus H.J. Hansen 27 28. 717 718 33 34 page 3. P. platyceras O. Sars. . . 34 4. „ nanseni O.Sars. . . . 718 5. „ glacialis O.Sars. . . . 718 19*.Gen.Parambasia A. Walker & AB nat 1. P. forbesii A.Walker& A.Seott 718 20.Gen.Nannonyx O.Sars . . 34 1. N. spinimanus A. Walker . 35 „ Integricauda (Stebb.) . . 35 „ goösii (Boeck) . . . . 36 thomsoni Stebb.+ . . . 36 „ kidderi (S. I. Sm.) . .. . 36 21. Gen. Lysianassa M.-E.. 37,718 L. plumosa Boeck . . . . 38 „ bispinosa (Della Valle) . 38 „ eubensis (Stebb.) -. . . 38 longicornis H. Luc. . . 39 . „ einghalensis (Stebb.) 39, 718 „ variegata (Stimps.). . . 39 „ punctata (A. Costa) . . 40 „ eoelochir (A. Walker). . 718 008 M-E. et „ nasuta Dana . . . . ..0 „ Pilicornis Heller. . . . 40 22.Gen. Perrierella Chevreux & E. L. Bow. .. | 1. P. audouiniana (Bate). ee 8: 23.Gen.Normanion Bonnier 41, 718 1. N. quadrimanus (Bate & pgıor el EZ Westw) Nr ut el 2.3: 3818 Bebb a 501 3. „ abyssi Chevreux . . . . 718 24.Gen. Paratryphosites Stebb. 42 1. P, abyssi (Goß&s)... ...» . .: 48 25.Gen. Paronesimus Stebb.. . 43 1. P. barentsi Stebb. . -. .. 48 26.Gen.Orchomene Boeck . . 4 1. ©. serrata (Boeck).. . . . 4 2. „ pectinata O. Sars . . . 45 3. „ batei O.Sas. . . .. 8 4. „ hanseni Meinert. . . . 46 5. „ erispata (Goes) . . . . 46 6. „ amblyops O. Sars . . . 46 27. TR Socarnoides Stebb. . . 47 1. S. kergueleni Stebb. . . . 47 2. „ stebbingi (G. M. Thoms.) 47 28.Gen. Menigrates Boeck . . 48 1. M. obtusifrons (Boeck) . . 48 28*,Gen.Charcotia Chevreux. . 718 1. C. obesa Chevreux . . . . 718 Systematic Index BE N a Zn re page 29.Gen. Aristias Boeck . . 49, 718 1. A. tumidus (Kroyer) . . . 9 „ microps O. Sars. ... „ commensalis Bonnier. . 50 neglectus H. J. Hansen . 50 „ megalops O.Sars . . . 51 Sappm 30. ten. Ambasia Boeck . 51, 719 1. A. danielssenii Boeck. .51, 719 2. „ pulchra (H. J. Hansen) 52, 719 2*,, murmanica Brüggen . . 719 30*.Gen.Schisturella Norm... . 719 1. S. pulehra (H. J. Hansen) . 719 31.Gen.Ichnopus A. Costa . . 52 1. I. spinicornis Boeck . . . 52 2. „ taurus A. Costa... ... 58 32.Gen.Anonyx Kröyer. . .». 53 1. A. nugax (Phipps) . 2. „ lagena Kröyer . . . '..54 3. „ affinis Ohlin . } 55 4. „ lilljeborgüi Boeck . . 55 5. „ ampulloides Bate . . . 55 32*.Gen. Socarnella A. Walker . 719 1. S. bonnieri A. Walker. . . 719 33.Gen.Socarnes Boeck . . . 56 1. S. bidentieulatus (Bate). . 56 2. „ vahlü (Kröyer) . .. .- .) »57 3. „ erythrophthalmus D::Roberls.. 0. 2m ed „ kroyeri (A. White) . . . 57 5 Y 34.Gen. Hippomedon Boeck . 58, 719 1. H.holbölli (Kreyer) . . . 58 2. „ dentieulatus (Bate) . . 59 3. „ propingvus O.Sars . . 59 4. „ robustus O.Sars . . . 59 5. „ longimanus (Stebb.) . . 60 6. „ geelongi Stebb.. . . . 60 7. „ bidentatus Chevreux . . 719 8. „ serratus S. J. Holmes . 719 35.Gen.Glycerina Hasw. . . . 60 1. G. tenuicornis (Hasw.) . . 61 2. „ affinis Chilton . . ... 61 35*, fan: Paracallisoma Cheyreux 719 1. P. alberti Chevreux . . . 719 36.Gen.Scopelocheirus Bate . 61 1. S. hopei (A. Costa). » . . 62 2. „ erenatus Bitte . .» . . 62 37.Gen. Alicella Chevreux.. . . 63 1. A. gigantea Chevreux . . . 68 „ topsenti Chevreux . . . 718 üigeh a Fi se N u an la a a 5 tz nn ER Jr Fi 38.Gen.Uristes Dana - . - - 1. U. gigas Dana FERN 2. „ umbonatus (O. Sars) . 39.Gen. Centromedon 0. Sars 65, 720 1. C. calearatus (O. Sars) 65 2. „ produetus (Goes) 66 3. „ pumilus (Lilj.) . : 66 4. „ typhlops (0. Sars) . . . 66 5. „ erenulatus Chevreux . . 720 40.Gen.Cheirimedon Stebb. 66, 720 1. C. erenatipalmatus Stebb. . 67 2. „ latimanus (O. Sars) 67 3. „ fougneri A. Walker 5120 4. „ hansoni A. Walker . . 720 5. „ dentimanus Chevreux . 720 41.Gen. Tryphosella Bonnier 67, 720 1. T. barbatipes (Stebb.). 68 2. „ abyssi Norm. . 2780 42.Gen. Tryphosa Boeck . 68, 720 1. T. insignis Bonnier. 75009 2. „ kergueleni (Miers) . . 69, 720 3. „ trigoniea (Stebb.) 70 4. „ pusilla (©. Sars) . 70 5. „ sarsi (Bonnier) 70 6. „ angulata O. Sars 70 7. „ compressa O.Sars. .. TI 8. „ nanoides (Lillj.) . 71 9. „ horingii Boeck 71 10. ,„ adarei A. Walker . . . 720 11. „ murrayi A. Walker. 720 12. „ nugax S. J. Holmes . 720 13. „ eucullata A. Walker . 720 43.Gen. Chironesimus O. Sars . 72 1. C. debruynii (Hoek) 72 44.Gen. Eurythenes S. I. Sm. 72 1. E. gryllus (Leht.) 73 45.Gen. Tmetonyx Stebb.+ .73, 720 1. T. eicada (©. Fabr.) 74 2. „ miersi (Stebb.) 75 3. „ acutus (O. Sars) . I 4. „albidus (O.Sarı) ... 7 5. „ eieadoides (Stebb.). . . 75 6. „ similis (O. Sars) . 2.70 7, „ leucophthalmus (O.Sars) 76, 720 8. „ caeculus (O. Sars) . 76 ig, „ exiguus (Chevreux). . . 720 10. „ stebbingi (A. Walker) . . 720 46.Gen. Tryphosites O. Sars. 77 1. T. longipes (Bate & Westw.) 77 page 47.Gen. Lepidepecreum Bate & Westw. F N! 1. L. typhlops Honnier, +18 2. „ foraminiferum Stebb.. 79 3. „ elypeatum Chevreux .79, 720 4. „ longicorne (Bate & Westw.) 80 5. „ umbo (Goös) . . - 80 48. dan. Orchomenella 0. Sars 81, 720 1. O. laevis Bomier . . 8 2. „ nanus (Kroyer) 81 3. „ Ppinguis (Boeck) . 82 4. „ minuta (Kroyer). 82 5. „ groenlandica (H.J. sin) 83 6. „ dilatata Chevreux . 720 7. „ pinguides A. Walker . . 721 8. „ franklini A. Walker . 721 9. „ macronyx Chevreux . 721 49, in: Orchomenopsis 0. Sars83, 721 1. ©. museulosa (Stebb.) 84 2. „ abyssorum (Stebb.) 84 3. „ obtusa O. Sars 85 4. „ zschauii (Pfeff.) . 85 5. „ proxima Chevreux . 72 6. „ chevreuxi Stebb.+. . . 721 7. „ nodimana A. Walker . . 721 8. „ rossi A. Walker . . er. 50.G@en.Katius Chevreux .. 721 1. K. obesus Chevreux . . . 721 Alibrotus M.-E. ; 85 Anonyx albus Gosse 85 „ amaurus Giles 85 „ annulatus Bate 86 „.,„broechüi Gatta.... +... 86 „ elegans W. Thomps. 86 „. exiguus Stimps. . 86 „ femoratus Pfeff. . 86 „ filiger Stimps.. 86 BOUS lie 2 2er U „ .nardonis Heller . - -....: 86 „ nobilis Stimps. RE Re. „ pallidus Stimps. . - - . . 86 „ politus Stimps. 86 „ . punctatus Bate ..86 „ schmardae Heller 87, 721 ». SP, Bate. 87 „ 8P., Della Valle 87 sp., G. M. Thoms. 87 Lysianassa affinis Hasw. . - - 87 „ australiensis Hasw.. . . . 87 brasiliensis Dana 87 „ XXU Systematie Index page page Lysianassa chauseiea M.-E.. . . 87 10. A. australis Hasw. . . . 104 35 20H MDR Bobs... taten. ie RT ‚11. „ rubella A. Costa 104, 722 „ fisheri Lockington . 87,721 12. „ amblyops O. Sars . 105, 722 „ marina Bate . 487,721 13. „ pusilla O. Sars. . . . 10 „ martensi Goes . »... . 87 14. „ anomala O. Sars . . . 106 „ nitens Hasw. ae.) 15. „ spinipes Boeck . . . 106 „ woodmasoni Giles . . . . 88 16. „ aequicornis Bruz.. . . 106 Orchomene grimaldii Chevreux . 88 17. „ serraticaudata Cheyvreux | Stenia Dana. . . Ela OB : 107, 722 „ magellanica ah Ar, lie 18. „ diadema (A. Costa) . . 107 19. „ acinaces Stebb. . . . 108 ; 20. „ spinimana Chevreux 109, 722 2. Fam. Stegocephalidae . 88 21. , compact Nom: ng 1.Gen. Phippsia Sichb.4 92.4.8089 2. “ typica (Bate) 0. ©1208 1. P.ampulla (Phipp) . . . 8 23. „ zamboangae Stebb. . . 110 2. „ gibbosa (0. Sarsı) . . . 9 24. „ tenuicomis Lil. . . . 110 2.Gen. Stegocephalus Kroeyer . 90 25. „ sarsi Chevreux . . 111 1. S. inflatus Kreyer .. .. 9 26. „ compressa 8. J. 722 2. „ similis ©. Sars . 91 27. „ tridens A. Walker . . 792 3.Gen. Stegocephaloides O.Sars 91 28. „ scabripes A. Walker .. 722 29. „ brachyceras A. Walker. 722 1. S. christianiensi 9,9 R on « 30. „ cyelops A. Walker . . 722 2. „ auratus (O. Sarsı) . . . 9 31 hassen "a9 . . { er . 4.Gen. Andaniopsis O. Sars. . 92 r agassizi (Judd) a ra 1. A. nordlandica (Boeck) . . 9 je daleyı dit 2 u 5.Gen. Andaniella O. Sars -. . 93 : japonica Bate2..: 8804147 1. A. pectinata (O. Sa) .. 9 „ limicola (Stimp.) . . 11 6.Gen. Andaniexis Stebb.+. . 9 1: A. abyssi (Boeck) . : . . 9 „ Spinescens (Aleock) . . 95 7.Gen. Parandania Stebb. . . 9 1. P. böoecki (Stebb.) .:. .. ... 9 „ nordmanni (M.-E) . . 111 „ pelagica (Stimps.) . 111, 722 „ pugetica Stimps. . . . 111 2.Gen.Byblis Boeck ... . 11 1. B. erythrops O.Sars . . 112 8.Gen. Andaniotes Stebb. . .. 9% 2. „ abyssi O.Sars...... . 113 1. A. eorpulentus (G. M. Thoms.) 96 In gaimardii (Kreyany 2,188 ; 4. „ longicornis O. Sars . . 113 9. Gen. Euandania Stebb.. . . 97 5. effnisD, Sare o etc: Me 1. B. gigantes (Stebb) . . 97 6. „ erassicornis Metzg. . . 114 7. „ guernei Cheyreux . 114, 722 Stegocephalus latus Hasw. . . . 9 8. „ serrata S.LSm. - . . 114 9. „ kallarthra Stebb... . . 115 3. Fam. Ampeliscidae. . . 9 10. „ lepta (Gile) . . . . 115 1.Gen. Ampelisca Kroyer. .98, 722 3.Gen.Haploops Lil. . . . 116 1. A. eschrichtii Kreyer . 100, 721 1. H. dellavallei Stebb.7 116, 722 2. „ brevicornis (A. Costa) .. 100 2. „ tubicola Lil. .. .. 17 3. „ macrocephala Lil. . 101 3. „ laevis Hoek . ee 4. „ gibba O. Sars . 101 4. „ setosa Boeck 117 5. „ chiltoni Stebb. . 102 5. „ robusta O. Sars . 118 6. „ fusca Stebb. . 102 Ä | 7. „ odontoplax O. Sars .103 | 4.Fam. Haustoriidae . 118, 722 8. „ uncinata Chevreux 108, 721 1.Gen.Bathyporeia Lindstr. . 119 9. „ abyssicola Stebb. . 104 1. B. guilliamsoniana (Bate) . 120 2.Gen. Platyischnopus Stebb.122,722 1. P. mirabilis Stebb. 123 2. „ neozelanicus Chilton 123 3. „ herdmani A. Walker 722 3.Gen.Haustorius St. Müll. 124 1. H. arenarius (Slabber) 125 4.Gen.Cardenio Stebb. . 125 1. C. paurodaetylus Stebb. 126 5.Gen.Priseillina Stebb. 126 1. P. armata (Boeck) 126 6.Gen. Pontoporeia Kroyer 127 1. P. mierophthalma O. Sars . 127 2. „ femorata Kroyer . 128 3. „ affınis Lindstr. . 128 „ .K0yi S.I. Sm. . 128 7.Gen. Urothoe Dana . 128, 722 1. U. abbreviata O. Sars 129 2. „ marina (Bate) . 130 3. „ grimaldii Chevreux 130 4. „ pulchella (A. Costa) . 130 5. „ poucheti Chevreux . 131, 722 6. „ brevicornis Bate 131 7. „ elegans Bate 3 8. „ spinidigitus A. Walker . 722 9. „ poseidonis Reib. 722 „. bairdii Bate . 132 „ irrostrata Dana 132 “ ma Gles . ...... 132 8.Gen. Urothoides Stebb. . 132 1. U. lachneössa (Stebb.) 132 5. Fam. Phoxocephalidae. 133 1.Gen. Phoxocephalus Stebb. 134 1. P. holbölli (Kroyer) . . 134 2. „ bassi Stebb. 135 3. „ kergueleni Stebb, 135 „ erythrophthalmus (Catta) 136 „ geniculatus (Stimps.) 136 „ obtusus (Stimps.) . - 136 '„ simplex (Bate) . 136 2.Gen. Leptophoxus O. Sars . 136 1. L. faleatüus (0. Sars) . 136 | 3.Gen. Paraphoxus O. Sars 137, 723 1. P. oeulatus (O. Sars) 137° 'Systematie Index page 2. B. pelagiea (Bate) 120 3. „ gracilis O. Sars 121 4. „ robertsoni Bate 121 5. „ pilosa Lindstr. . 121 „ lindströmi Stebb.+ 122 XXIII page 2. P. maculatus (Chevreux) 138, 723 3. „ Spinosus S. J. Holmes 723 4.Gen. Metaphoxus Bonnier . 138 1.M. typieus Bonnier 138 2. „ fultoni (T. Seott) 139 3. „ pectinatus (A. Walker) . 139 5.Gen.Harpinia Boeck . . 140,723 1. H. mucronata O. Sars 141 2. „ crenulata (Boeck) . 141 3. „ pectinata O. Sars . 142 4. „ serrata O. Sars . . 142 5. „ excavata Chevreux .142, 723 6. „ antennaria Meinert 143 7. „ propinqua O. Sars 143 8. „ obtusifrons Stebb. 143 9. „ plumosa (Kroyer) 144 10. „ truncata O. Sars a 11. „ abyssi O. Sars . .. 144 12. „ laevis O. Sars 145 13. „ latipes Norm. ; 723 6.Gen. Pontharpinia Stebb. 145 1. P. pinguis (Hasw.) 146 2. „ rostrata (Dana) 146 „ grandis (Stimps.) . 147 „ uneirostrata (Giles) .147, 723 7.Gen. Parharpinia Stebb. 147 1. P. villosa (Hasw.) . 147 6. Fam. Amphilochidae 148 1.Gen. Amphilochus Bate 149, 723 1. A. manudens Bate 150 2. „ neapolitanusDellaValle150,723 3. „ tenuimanus Boeck 150 4. „ marionis Stebb. 151 5. „ brunneus Della Valle 151 6. „ spence-batei (Stebb.) 723 „ longimanus Chevreux 151, 723 „ melanops A. Walker . 152 „ oculatus H. J. Hansen . 152 2.Gen. Amphilochoides O0. Sars 152, 723 1. A. boeckii ©. Sars . 152,723 2. „ odontonyx (Boeck) 153 3. „ Intermedius T.Seott . 153 4. „ longimanus (Chevreux) . 723 3.Gen. Gitanopsis O. Sars . 153 1. G. bispinosa (Boeck) . 154 2. „ inermis (O. Sars) . 154 3. „ arctica O.Sars . 155° 4.Gen.Gitana Boeck . ... 15 1. G. sarsi Boeck . 155 XXIV Systematic Index page page 2. G. abyssicola O. Sars . . 156 3. Gen. Paraleucothoe Stebb. . 169 3. „ rostrata Boeck. . . . 156 1. P. novaehollandiae (Hasw.) 169 5.Gen. Tetradeion Stebb. . . 157 1. T. erassum (Chilton). . -. 157 | 8. Fam. Anamixidae . . . 10 6.Gen. CyproideaHasw. . 157, 723 1.Gen. Anamixis Stebb. . 170, 724 1. C. ornata (Hasw.).. . - .. 158 1. A. hanseni Stebb.. '. . . 170 2. „ otakensis (Chilton) . . 723 2. „ stebbingi A. Walker. . 724 7.Gen. Stegoplax 0. Sars . . 158 Br 1. S. longirostris O. Sars . . 159 | 9.Fam. Metopidae . .. . ızı 8.Gen. Peltocoxa Catta . . . 159 1.Gen.Metopa Boeck . . 172,724 1. P. marioni Catta . . . . 160 1.M.esmarki Boeck. . . . 173 „ brevirostris (T. & A. Seott) 2. „ robusta O. Sars . . 173,724 160, 723 3. „ sinuata O.Sarsı . . . 174 9.Gen. Paracyproidea Stebb. 160 4. „ propinqua O. Sars . . 174 1. P. lineata (Hasw) . . . 160 5. „ palmata O. Sars . . 174,724 10.Gen.Gallea A. Walker . . 728 6. „ elypeata (Kroyer) . . 175,724 1. G. teeticauda A. Walker . 728 7 m dert KBate a oe EEE ERTE 8. „ spectabilis O. Sars . . 176 AmphilochussquamosusG. M.’Thoms. 161 IR x re J. Hansen Bi 3 Probolium serratipes Norm. . 161, 723 11. „ norvegica (Lij) . . . 177 j „ spence-batei Stebb. . . 161,728 12, „ boeckii O. Sars. . . . 178 4 a 13. „ leptocarpa O. Sars . . 178 7. Fam. Leucothoidae . . 161 14. „ longicornis Boeck . . 179 1.Gen.Seba Bate . .: . 162, 724 15. „ pusilla O. Sars. .. . 179 1. S. innominata Bate . . . 162 16. „ aequicomis O. Sars . . 180 j 2. „ saundersii Stebb. . 163, 724 17. „ borealis O. Sars . . . 180 . 3. „ armata Chevreux . . . 724 18.;, rubrovittata O. Sars . . 180 2.Gen.Leucothoe Leach .163,724 | 19. „ sölsbergi J.S. Sch... . 181 1 1. L. traillii &. M. Toms... .. 194 |. 2% „ tenuimana, 0, Bars... .. 181 2. „ pachycera Della Valle . 164 21. „via DL Da Ser } REES 165 22. „ abscisa Norm. . .\. . 724 { ers 23. „ quadrangula Reib. . . 724 i 4. „ furina (Sav) 0... .. 165 ” 1 5. „ spinicarpa (Abildg.). . 165 2.Gen.Metopella O. Sars . . 182 : 6. „ commensalis Hasw. . . 166 1.M.nasuta (Boeck). . . . 12 7. „ tridens Stebb. . - - - 166 2. „ nasutigenes (Stebb.) . . 183 , 8. „ brevidigitata Miers . . 167 3. „ ovata (Stebb.) . . . . 183 .4 9. „ richiardii Mich. Lessona 167 4. „ neglecta (H. J. Hansen). 14 © 10. „ ineisa D. Roberts. . . 167 5. „ carinata (H. J. Hansen) . 184 11. „ lilljeborgii Boeck . 167, 724 6. „ longimana (Boeck) . . 185 12. „ euryonyx A. Walker. . 724 3.Gen. Metopoides DellaValle 185 13. „ hornelli A. Walker . . 724 1. M. magellanieus (Stebb.) . 185 14. „ stegoceras A. Walker . 724 2. „ parallelocheir (Stebb.) . 186 j „ affinis Stimps. . . » .. 168 3. „ compactus (Stebb.) . . 186 - „ antarctica Pfefl. . . . 168 4.Gen.Proboloides Della Valle Be „ erassimana Kossm. . . 168 187, 725 2 „ diemenensis Hasw. . . 168. 1. P. grandimanus (Bonnier) . 187 5 „ gracilis Hasw. . . . .. 168 2. „ erenatipalmatus (Stebb.) 188 „ grandimana Stimps. . - 168 3. „ bruzelii (Goes). . » - 188 „ stylifera Stimps. . . +» 16 4. „ gregarius (O. Sars) . . 189 nn N ET a a DR ET ee a re ES? aa er Er TER ee a 3 “ P. calcaratus (O. Sars) . . 6. „ glacialis (Kroyer) . 7. „ groenlandieus = RK Hansen) 190, „ sarsii (Pfefl.). » » - - F 5 _Metopa normani Hoek 10. Fam. Cressidae. 1.Gen.Cressa Boeck . . - 1. C. dubia (Bate). . . - 2. „ minuta Boeck . . . - 3. „ abyssicola O. Hars 11. Fam. Stenothoidae. . 192, 1.Gen.Stenothoe Dana . . 192, . richardi Chevreux . „ valida Dana . „ peltata S. I. Sm. „ antennulariae Della Valle cattai Stebb.+ . \ „ elypeata Stimps. .195, „ monoeuloides (Mont.) „ dollfusi Chevreux . . 196, . „ tenella O. Sars. megacheir (Boeck) mierops O. Sars „ marina (Bate) . bosphorana Sowinski brevicornis O. Sars adhaerens Stebb. . setosa Norm. I . „ eypris S. J. Holmes . minuta S. J. Holmes alaskensis S. J. Holmes gallensis A. Walker . „ guerinii (Bate) . „ longimana (Bate) . „ miersii (Hasw.). 2.Gen. Parametopa Chevreux . 1. P. kervillei Chevreux 3.Gen. Stenothoides Chevreux 1. S. perrieri Chevreux . . 198, 11*. Fam. Ingolfiellidae 1.Gen.Ingolfiella H. J. Hansen 1. I. abyssi H. J. Hansen . 2. „ littoralis H. J. Hansen . page 189 189 725 190 190 190 191 191 192 192 725 725 194 194 194 195 195 725 196 7125 196 197 197 725 198 199 199 725 725 725 725° 725 Systematie Index XXV page 12. Fam. Phliantidae . . . 200 1.Gen. Phlias Guer. 200 1. P. serratus Guer. . 201 2.Gen. Pereionotus Bate & Westw.. - .» >72 4208 1. P. testudo (Mont). . 201, 726 3.Gen.Palinnotus Stebb. . 202 1. P. thomsoni (Stebb.). . . 202 4.Gen.Iphiplateia Stebb. . 203 1. I. whiteleggei Stebb. . . 203 5.Gen.Iphinotus Stebb. 204 1. I. typieus (G. M. Thoms.) 204, 726 6.Gen. Bircenna Chilton 205 1. B. fulva Chilton 205 Gen. Kuria A.Walker&A. Scott 726 K. longimana A. Walker & Ara nr 1,70 13. Fam. Colomastigidae 206 1.Gen. Colomastix Grube . 206 1. ©. brazieri Hasw. . OR 2. „ pusilla Grube . ..... 207 3. „ hamifera Kossm. . 207 14. Fam. Lafystiidae . . 208 1.Gen. Lafystius Kroyer 208 1. L. sturionis Kroyer 208 15. Fam. Laphystiopsidae . 209 1.Gen.Laphystiopsis O. Sars 209 1. L. planifrons O. Sars . 209 16. Fam. Acanthonotozo- matidae 210 1.Gen. Odius Lillj. . 210 1. O. carinatus (Bate) 211 2.Gen. Panoploea G. M. Thoms. 211 1. P. spinosa G. M. Thoms. 212 2. „ eblanae (Bate) . 212 3. „ minuta (O. Sars) . 213 „ ambigua (Hasw.) . 213 3.Gen.Iphimedia H. Rathke . 214 1. I. obesa H. Rathke 214 2. „ pulchridentata Stebb. 215 3. „ pacifica Stebb. . 215 4. „ nodosa Dana - 216 „ bormani R.O. Oasis. 217 ‚ stimpsoni Bate. i 217 4.Gen. Acanthonotozoma Boeck ä 218 1. A. serratum (0. Fabr) . 218 XXVI 2, A. eristatum (J. C. Ross) . 3. „ inflatum (Kroyer) . 17. Fam. Pardaliscidae 1.Gen.Halicoides A. Walker . 1. H. anomalus A. Walker. 2.Gen.Pardalisca Kroyer . 1. P. abyssi Boeck 2. „ tenuipes O. Sars 3. „ euspidata Kroyer . 4. „ marionis Stebb. . 3.Gen. Pardaliscoides Stebb.. 1. P. tenellus Stebb. . 4.Gen. Nieippe Bruz.. . . - 1. N. tumida Bruz. - . .. 5.Gen.Synopioides Stebb.. 1. S. macronyx Stebb. . „ Secundus Stebb. : 6.Gen.Pardaliscella O. Sars . 1. P. boeckii (Malm) . 2. „ axeli Stebb.+ 7.Gen.Halice Boeck . 1. H. abyssi Boeck 18. Fam. Liljeborgiidae 1.Gen. Liljeborgia Bate. 1.3. pallida (Bate) „ brevicornis (Bruz.) „ macronyx (O. Sars) . „ fissicornis (Sars) „ eonsanguinea Stebb.. „ dubia (Hasw.) - „ kinahani (Bate) „ dellavallei Stebb.+ „ bispinosa (A. Costa) . „ pugettensis (Dana) . 234, 2.Gen.Idunella O. Sars . 1. I. aequicornis (O. Sars) 2. „ pieta (Norm.) A 19. Fam. Oedicerotidae 1.Gen. Perioculodes O. Sars 237, 1. P. longimanus (Bate & WORWN 2. „ Serra A. Walker „ aequimanus (Kossm.) „ megapleon (Giles) 2.Gen. Gulbarentsia Stebb. 1. G. hoeki Stebb. Ä 3.Gen. Exoediceros Stebb.. 1. E. fossor (Stimps.). Systematie Index page 219 page 4.Gen. Pontocrates Boeck.. . 239 1. P. altamarinus (Bate & Westw;) PR nr 2. „ arctieus O. Sars . .... 240 3. „ arenarius (Bate) . . . 241 5.Gen. Synchelidium O. Sars 241 1. S. haplocheles (Grube) . . 242 2. „ maculatum Stebb.+. . 242 3. „ tenuimanum Norm. . . 243 4. „ intermedium O. Sars . 243 6.Gen.Oediceros Kroyer .243, 726 1. O. saginatus Kroyer . . . 244 2. „ borealis Boeck. . . . 244 3. „ newnesi A. Walker . . 726 „ latrans (Hasw.). . . . 285 7.Gen. Paroediceros O. Sars . 245 1. P. macrocheir (O0. Sars) . 245 2. „ intermedius Stebb.+ . 245 3. „ eurvirostris CH. J. Hansen) 246 4 . „ Iynceus (Sars) . . . . 246 5. „ propinquus (Goes) . . 246 8.Gen.Haliereion Boeck . . 247 1. H. aequicornis (Norm.) . . . 247 9.Gen. Arrhis Stebb.+ . 248, 726 1. A. phyllonyx (Sars) . . . 248 10.Gen.Westwoodilla Bate . 249 .W.brevicalear (Goes) . . 249 ..„ caecula (Bate) +... . 2.2000 1 2 3. „ megalops (O. Sars) . . 250 4. „ acutifrons (O. Sars) . . 251 5 „ rectirostris (Della Valle) 251» 11.Gen. Carolobatea Stebb.. . 252 1. C. schneideri (Stebb.) . . 252 12.Gen.Oediceropsis Lilli... . 252 1. OÖ. brevicornis Lillj. . =» . 253 13.Gen. Acanthostepheia Boeck 253, 726 1. A, malmgreni (Goes). . . 254 2. „ pulchra Miers . 254, 726 „ behringiensis (Lockington) 254, 726 14.Gen. Aceroides O. Sars . . 254 1. A. latipes (O. Sars) ... . 255 15.Gen. Bathymedon O0. Sars . 255 1. B. obtusifrons (H. J. Hansen) 256 2. „ saussurei (Boeck) . . . 256 3. „ longimanus (Boeck) . . 257 4. „ acutifrons Bonnier . . 257 16.Gen.Monoculopsis O. Sars 257 1.M. longicornis (Boeck) . . 258 Er page 17.Gen. Monoculodes Stimps. 258, 727 1.M. gibbosus Chevreux 259, 726 2. „ hanseni Stebb. . . . . 260 3. „ longirostris (Goes). . . 260 4. „ kröyeri Boeck . . . . 261 5. „ pallidus O. Sars. . . . 261 6. „ earinatus (Bate) . . . 261 7... „ griseus (Della Valle) . . 262 8. „ borealis Boeck . . . . 262 9, „ schneideri ©. Sars. . . 263 10. „ crassirostris H.J. Hansen 263 11. „ latimanus (Goes) . . . 264 12. „ tesselatus J. S. Schn.. 264 13. „ simplex H.J. Hansen . 264 14. „.tubereulatus Boeck . . 265 15. „ norvegieus (Boeck) . . 265 subnudus Norm. . . . 266 17. „ packardi Boeck. . . . 266 18. „ tenuirostratus Boeck. . 267 edwardsi S. J. Holmes . 727 „ demissus Stimps. . . . 267 18.Gen.Oediceroides Stebb. . 267 1. O.rostratus (Stebb.) . . . 268 „ proximus Bonnier . . . 269 einderella Stebb. . . . 269 „ ornatus (Stebb.) .. . . 270 Oedicerus novi-zealandiae Dana 270 20. Fam. Synopiidae . . . . 270 1.Gen.Synopia Dana . . . . 27 1. S. ultramarina Dana. . . 271 2. „ scheeleana Bovall. . . 272 „ angustifrons Dana. . . 272 „ earaibica Bovall. . . . 273 „ orientalis Kossm. . . . 273 21. Fam. Tironidae . 273, 722 1.Gen.Bruzelia Boeck. . . . 274 1. B.typiea Boeck. . .. . 274 2. „ tuberculata O. Sars . . 275 2.Gen. Tiron Lillj. .275, 727 1. T. acanthurus Lil. . . . 276 2. „ thompsoni A. Walker. . 727 3.Gen. Argissa Boeck . .276, 722 1. A. hamatipes ‚(Norm.). . . 277 2. „ stebbingi Bomnier. . . 277 4.Gen.Astyra Boeck . . . . 278 1. A. abyssi Boeck. . . . . 278 5.Gen.Syrrhoites O.Sars . . 279 - 1. S. serratus (O. Sars) . . . 279 Systematic Index XXVI page 2. S. fimbriatus (Stebb. & D. Koberigyi: 7 2,25.280 3. „ walkeri Bonnier. . . . 281 3 levis (Boeck) . - . . . 281 6.Gen.Syrrhoe Goös . . . . 381 1. S. erenulata Goes‘. ... . .282 2. „ semiserrata Stebb. . . 283 3. „ papyracea Stebb. . . . 283 7.Gen. Pseudotiron Chevreux 284 1. P. bouvieri Chevreux.. . . 284 22. Fam. Calliopiidae 285, 727 1.Gen.Laothoes Boeck . . . 286 1. L. meinerti Boeck. . . . 286 „ carcinophilus (Chevreux) 287, 727 1*. Gen. Bouvierella Chevreux 727 1. B. careinophila (Chevreux) 727 2.Gen.Chosroes Stebb. . . . 287 1. C.ineisus Stebb. . . . .. 287 3.Gen.Sancho Stebb. . . . . 288 1. S. platynotus Stebb. . . . 288 » 4.Gen. Amphithopsis Boeck . 289 1. A. longicaudata Boeck . . 289 5.Gen.Halirages Boeck . . . 2% .H.nilssoni Ohlin . . ... 290 „ fulvoeinetus (Sars) . . 291 huxleyanus (Bate). . . 291 „ quadridentatus O. Sars. 292 „ batei (R. O. Cunningh.) . 292 „ megalops (Buchh) . . 29 6.Gen. Leptamphopus O0. Sars 293 > 0 m 1. L. longimanus (Boeck) . . 293 2. „ novaezealandiae (G.M. THOWW. year A 6*.Gen. Oradarea A. Walker . 727 1. O. longimana A. Walker . 727 7.Gen. Paraleptamphopus Stebb. 294 1. P. subterraneus (Chilton) . 294 2. „ eaeruleus (G. M. Thoms.) 295 8.Gen.Calliopius Lilli. . . . 29 1. ©. laeviusculus (Kröyer). . 296 2. „ rathküi (Zadd.) . . . . 296 „ pietus (Giles). . . . . 297 9.Gen. Paracalliope Stebb.. . 297 1. P. fluviatilis (G. M. Thoms.) 297 10.Gen. Harpinioides Stebb. . 298 1.H.drepanocheir Stebb. . . 298 11.Gen. Atylopsis Stebb. . .299, 727 XXVII Systematie Index page page 1. A. dentata Stebb. . . . . 29 5.Gen.Sympleustes Stebb.. . 317 2. „ emarginata Stebb.. . . 300 1. S. megacheir (A. Walker) . 317 3. „ latipalpus A. Walker & 2. „ latipes Sar). . x. . 817 2 NN RE U Er 3. „ grandimanus (Chevreux) 12.Gen. Cleippides Boeck . . 300 318, 728: 1. C. trieuspis (Kroyer) . . . 301 4. „ glaber (Boeck) . . . . 318 2. „ quadricuspis Heller . . 301 5. „ pulchellus (©. Sars) . . 319 13.Gen. Stenopleura Stebb.. . 302 6. „ olrikii (H. J. Hansen) . 319 1. S. atlantica Stebb. . . . 302 6.Gen. Dautzenbergia Chevreux 728 14.Gen. Haliragoides ©. Sars . 303 1. D. grandimana (Chevreux).. 728 1. H. inermis (O. Sars) . . . 308 Gen. Parapleustes Buchh. . 320 15.Gen. Apherusa A. Walker 304, 727 P. gracilis Buchh. . . . . 320 1. A: eirrus (Bate) .... . . . 304 2. „ tridentata (Bruz) . . . 305 | 24. Fam. Paramphithoidae 320 3. „ bispinosa (Bate). . . . 305 1.Gen. Epimeria A. Costa . 321,728 4. „ megalops (O. Sars) . . 306 1. E. parasitica (Sars) . . . 321 5. „ glacialis (H. J. Hansen). 307 2. „ loricata O. Sars. . . . 322° 6. „ jJurinei (M.-E) . . . . 807 3. „ comnigera (F) . ... . 38 7. „ georgiana (Pfefl) . . . 308 | . 4, „ tuberculata O. Sars . . 828 8. „ gracilis S. J. Holmes. . 727 5. „ Inermis A. Walker. . . 728 9. „ dlevei O. Sars ..... . 727 2.Gen.Paramphithoe Bruz. . 324 10. „ ovalipes Norm. . . . . 727 1. P. buchholzi (Stebb.).. . . 324 ” antiqua (Bate) '. » . .. 727 2. „ hystrix (J. C. Ross) . . 325 „ barretti (Bate) . . . . 308 3. „ polyacantha (J. Murdoch) 325 ” laevis (Hasw.) TE Ar 308 j cuspidata (Lepech.) . . 326 „ translucens (Chilton). . 308 3.Gen. Actinacanthus Stebb.+ 326 a 1. A. tricarinatus (Stebb.) . . 326 S. gracilis Pfeff.. . . . . 308 23. Fam. Pleustidae . . . . 309 1.Gen.Pleustes Bate . . . . 309 25.Fam. Atylidae . . . . .. 397 1.Gen. Atylus Leach . . .828, 728 1. P. panoplus (Kröyer). . . 310 “ A. pn “. Er RR = 2. „ eataphraetus (Stimps.) . 310 a ER “ medius (Go8s) ET ER ABIT 2.Gen. Nototropis A. Costa 329, 798 „ oeeidentalis (Stimps) . 311 1. N. falcatus (Metzg.) . . . 330 „ tubereulatus Bate. . . 311 2. „ swammerdamei (M.-E.) 380 2.Gen. Neopleustes Stebb.+ 311, 728 3. „ vedlomensis(Bate&W estw.) 331 1. N. pulehellus (Kreyer) . . 312 4. „ guttatus (A. Costa) . . 381 2. „ boeckii (H. J. Hansen) . 312 d. n nordlandicus (Boeck). . an 3. „.bieuspis (Kröyer) . . . 318 6. „ smitti (Go8s) BEE ie 4. „ monocuspis (O. Sars). . 313 1. y homoehir ae) Re 5. „ brevicornis (0. Sars).. . 318 8. „ minikoi (A. Walker) . . 728 6. „ assimilis (0. Sars). . . 314 9:\; granulosus (A. Walker) . 728 7. „ bairdi (Boeck). . . ‘. .. 314 „ Villosus (Bate) . . . . 3834 8. „ paeificus (A. Walker) . . 728 „ pugettensis (Dana). . . 728 | 26. Fam. Melphidippidae 334. 728 3.Gen.Mesopleustes Stebb. . 315 1.Gen. Melphidippa Boeck . 335. 1.M. abyssorum (Stebb.) . . 315 1.M.goösi Stebb. . . » . . 385 4.Gen. Stenopleustes 0. Sars . 316 2. „ macrura O. Sars . . . 8336 1. S. malmgreni (Boeck) . . 316 3. „ borealis Boeck . . . . 3836 2. „ nodifer (O. Sars) . . . 316 4. „ serrata (Stebb.). . . » 8337 U ON RELET GUFDRER -AERHEHEN “ GL ERFR De Kia | = gl Lil 2 ne Ara aaa page .„Melphidippella 0. Sars 337 1.M. macra (Norm.) . 337 3.Gen.Hornellia A. Walker 728 1.H. incerta A. Walker . 728 27. Fam. Eusiridae . .338, 728 1.Gen. Eusirus Kroyer .338, 729 1. E. cuspidatus Kroyer. 339 2. „ propinquus O. Sars 340 3. „ antareticus G.M. Thoms. 340 4. „ longipes Boeck . 341 5. „ leptocarpus O. Sars . 341 6. „ biscayensis Bonnier . 342 7. „ minutus O. Sars 342 8. „ holmü H. J. Hansen . 342 9. „ laevis A. Walker 729 2.Gen. Eusiropsis Stebb. 343 1. E. riisei Stebb. 343 3.Gen. Eusiroides Stebb. .345, 729 1. E. monoculoides (Hasw.) . 345 2. „ dellavallei Chevreux . 346 3. „ erassi Stebb. 346 4. „ sarsi ser ; 729 5. „ orchomenipes A. Walker 729 „ lippus (Hasw.) . 346 4.Gen. Cleonardo Stebb.. 346 1. C. longipes Stebb.. . . 347 2. „ appendiculatus (0. Sars) 347 5.Gen. Rhachotropis S.I.Sm. 347 1. R. aculeata (Lepech.) . 348 2. „ kergueleni Stebb. . 349 3. „ grimaldii (Chevreux) 350, 729 4. „ elegans (Bonnier) . . 350 5. „ oculata (H. J. Hansen) . 350 6. „ inflata (O. Sars). 351 7. „ helleri (Boeck) . 351 8. „ macropus O.Sars. . . 352 9. „ leucophthalma O.Sars . 353 10. „ rostrata (Bonnier) . 353 ‚11. „ graeilis (Bonnier) . 353 6.Gen. Rozinante Stebh.. 354 1. R. fragilis (Goös) 354 7.Gen. Eusirogenes Stebb.. . 728 1. E. dolichocarpus Stebb.. 728 28. Fam. Bateidae 2 8355 1.Gen.Batea Fr. Müll.. . . 855, 729 1. B. catharinensis Fr. Müll. . 355 2. „ secunda S. J. Holmes 729 Systematie Index 29. Fam. Pontogeneiidae 1.Gen. Eurymera Pfeff. 1. E. montieulosa Pfeft.. 2.Gen. Bovallia Pfeff. . 1. B. gigantea Pfeft. . 3.Gen. Stebbingia Pfeff. . 1. S. gregaria Pfeff. 4.Gen. Pontogeneia Boeck . 1. P. inermis (Kröyer) 2. „ magellanica (Stebb.). danai (G. M. Thoms.). „ eapensis (Dana). „ fissicauda (Dana) . „ tasmaniae (G. M. Thoms.) 361 5.Gen. Zaramilla Stebb. . 361 1. Z. kergueleni Stebb. . 361 6.Gen. Atyloides Stebb. . .362, 729 1. A. serraticauda Stebb. .362, 729 2. „ gabrieli Sayce 729 3. „ fontanus Sayee . 729 7.Gen. Paramoera Miers. 363 1. P. austrina (Bate) . 363 a simplex (Dana) . 363 30. Fam. Gammaridae . .364, 729 1.Gen. Boruta Wrzesn. 367 1. B. tenebrarum Wrzesn. . 368 2.Gen.Synurella Wrzesn. 368 1. S. ambulans (Fr. Müll.) . 369 2. „ polonica Wrzesn. 369 3.Gen.Paracrangonyx Stebb. 369 1. P. compactus (Chilton) . 369 4.Gen.Apocrangonyx Stebb. 370 1. A. lueifugus (O. P. Hay) 370 5.Gen.Crangonyx Bate . .370, 729 1. C. subterraneus Bate. 371 2. „ flagellatus Benediet .371, 730 3. „ vitreus (Cope) 372 4. „ tenuis S. I. Sm.. .. 872 5. „ bifureus O. P. Hay .378, 730 6. „ recurvus (Grube) 373 7. „ bowersü €. J. Ulr. 729 -„ ermannii (M.-E.) 373 6.Gen.Hyalellopsis Stebb.. 374 1. H..czyrnianskü (Dyb.) . . 374 7.Gen.Pallasea Bate . .374, 730 1. P. dybowskii Stebb. 375 2. „ reissnerii (Dyb.) 376 3. „ ‚cancellus (Pall.) .376, 730 4. „ gerstfeldtii (Dyb.). .377, 730 XXX Systematie Index page page: 5. P. quadrispinosa O. Sars 377,730 | 19.Gen.Micruropus Stebb. . . 398 6. „ kesslerii (Dyb.). . .378, 730 1.M.puella (Dyb). . ... . 399 7. „ baikali Stebb. . . .378, 780 2. „ inflatus (Dyb.), » 2. -. 399 8. „ brandtii (Dyb.) . . .379, 730 3. „ Vortex (Dyb.);.. 2% 400° 9. „ grubii (Dyb.). . . .879, 730 4. „ talitroides (Dyb.) . . . 400 10. „ cancelloides (Gerstf.) 380, 730 5. „ littoralis (Dyb). . . . 401 „ dryshenskii (Garjajeff) . 730 | 6. „ glaber (Dyb). . . . . 401 „ meyerii (Garjajeff). . . 730 7. „ rugosus (Dyb.) . . . . 402 „ nigra (Garjajeff). . . . 780 8. „ wahlü (Dyb.). . . . . 402 , viridis (Garjajeff) . . . 730 9... Axgenli (Dyb.) ..°..,..% 2 208 8.Gen. Weyprechtia Stuxb. . 380 10. „ porla (Dyb):. ,..; 2M 1.W.heuglini (Buchh.) . .381, 730 11. „ klukii (Dyb.).. . . . . 408 2. „ pinguis (Kröyer) . . . 382 12. „ pachytus (Dyb.). . . . 404 9,Gen.Paramicruropus Stebb. 382 20.Gen.Neoniphargus Stebb. 404, 731 . 1. P. solskii (Dyb.). . . . . 382 1. N. thomsoni Stebb. . .404, 731 2. „ taczanowskii (Dyb.) . . 382 2. „ spenceri (Sayce). . . . 731 10. Gen.Parapherusa Stebb.7 . 383 3. „ fultoni Sayce. . . . . Tal 1. P. crassipes (Hasw.) . . . 888 „ moniezi (Wrzesn.). . . 405. 11.Gen.Amathillopsis Heller . 384 '21.Gen. Niphargus Schiödte 405, 731 1. A.spinigera Heller . . . 384 .N. eroaticus (Jurinae). . . 406 2. „ affinis Miers Wr. %.%. 22885 m forelüi Humb.. . . . . 406 . „ australis Stebb.. . . . 885 « „ aquilex Schiödte . . . 406 1 2 3 12.Gen.Gammarellus Herbst . 386 4. „ stygins OR) a 1. G. homari (F.) 387 5. „ puteanus (C. L. Koch) . 407 ER a rn, B.:4 virei Chevreux . . .408, 731 2. „ angulosus (H. Rathke) . 387 n font » „ earinatus (H. Rathke) . 388 Er ontanus Bate . . .408, 731 9 . „ Kochianus Bate . 408, 731 >] *. [2 r} 18; Bea Sarah Stebb. 388, 730 . „ oreinus Joseph . . . . 408 1. E. mueronatus (S. A. ge E 10. „ godeti Wrzesn. ... . . 409 9 andern N 11. „ mortoni G. M. Thoms. . 731 er Br a en rd 12. „ pulchellus Saycee . . . 731 ; ER ii ni 2.8 S Me es 13. „ plateaui Chevreux . ... 731 ..„ graciis ( nr 0‘ 14. „ ladmiraulti Chevreux. . 731 5. „ antennatus (Pack.) .390, 731 casparianus Wrzesn 409 ” ; > 14. TR EERENENR Stebb. 391, 731 „ easpary (Pratz) . . .409, 731 1. A. spinosa (0. Sars) . . .. 391 „ elegans Garbini.. . . 409 ee Sm och a, 3 \ 392, 2 2 re n Costa) 410 N .Brachyuropus Stebb. . miınutus (Gerv. a a u. D, En (Dyb.).. » » 8398 i montanus (A. Costa). . 410 2. „ reichertii (Dyb.) . . . 89 „ pontieus Czern. . . 410 16.Gen.Macrohectopus Stebb.+ 394 „ rhipidiophorus (Catta) 110, 732 1. M. branickü (Dyb.). . . . 394 „ subterraneus (Leach) 410, 732 17.Gen.Cardiophilus O. Sars . 395 ‚ tatrensis Wrzesn. . . . 410 1. C. baeri 0. Sars . . RL .:895 | 21*. Gen. Bathyonyx Vejd. . . 729 18.Gen.Brandtia Bate . . . . 39 1. B. devismesi Vejd.. . . . 729 1.3; lata (Dyb) 2107 22,008 21**,Gen. Pseudoniphargus 2. „ latissima (Gerstf.) . . . 396 Chevreux. . . RE 3. „ tubereulata (Dyb.). . . 397 1. P. africanus Cheyrenk: 82720 4. „ morawitzii (Dyb.) . . . 397 22.Gen.Eriopisa Stebb. . .411, 732 5. „ smaragdina (Dyb.) . . 398 1. E. elongata (Bruz) . . . 411 6. „ fasciata Stebb. . » . . 898 2. „ sechellensis Chevreux . 732 ud + u Ta Se in ee te ice aa 7 el ae N ' (ar a rad. 2 ' ES a Aa a a Ba a en a ı Dale ln 5 J Be Far Ta“ IR A. b TEN" » a A rn ® g ER TER M ae a a a u ne '23.Gen. 1.6. an, Gmelina O. Sars . costata O. Sars . „ kusnezowi (Sowinski). laeviusceula O. Sars pusilla O. Sars . .Gmelinopsis O. Sars tubereulata ©. Sars aurita O. Sars. .Hakonboeckia Stebb. . .strauchü (Dyb.). .BaikalogammarusStebb. . pullus (Dyb.) . .Parelasmopus Stebb. 417, . suluensis (Dana) setiger Chevreux .Cheirocratus Norm.. .sundevallii (H. Rathke) . intermedius O. Sars . robustus O. Sars assimilis (Lilj.) . .Megaluropus Hock . 2 agilis Hoek .Melita Leach . pallida OÖ. Sars . quadrispinosa Vosseler . fresnelii (Aud.) . nitida S. I. Sm. . pellueida O. Sars . coroninii Heller . palmata (Mont). obtusata (Mont.) amoena H. J. Hansen formosa J. Murdoch . dentata (Kreyer) gladiosa Bate. richardi Chevreux . $ parvimana S. J. Holmes zeylanica Stebb. appendiculata (Say) . confervicola (Stimps.) gayi (Nie.) . inaequistylis Be 199, oxyura Catta . Sp., F. Brandt. „ SP., Stimps. .Paraceradocus Stebb... . miersii (Pfeff.) .Ceradocus A. Costa. . rubromaculatus (Stimps.) semiserratus (Bate) ‚417, „421, page 412 412 413 413 414 4 414 415 415 415 416 416 732 732 732 417 418 419 419 419 420 420 732 422 422 423 424 424 424 425 426 426 427 427 428 732 732 732 428 428 428 732 429 429 429 429 429 430 430 431 Systematie Index XXXI page 3. C. orchestiipes A. Costa. . 432 4. „ torelli (Goes). 432 33.Gen.Maera Leach 433, 732 1. M.tenera ©. Sars 434 2. „ quadrimana (Dana) . 434 3. „ grossimana (Mont.) 435 4. „ inaequipes (A. Costa) 435 5. „ temuimana (Bate) . 436 6. „ westwoodi Stebb. . 436 7. „ fureicornis (Dana). 437 8. „ hamigera (Hasw.) . 437 9. „ tenella (Dana) 438 10. „ loveni (Bruz.) 438 11. „ othonis (M.-E.) . 438 12. „ mastersii (Hasw.) . 439 13. „ dubia Calm. £ 132 14. „ hirondellei Chevreux . 732 15. „ othonides A. Walker . 732 „ albida (Dana). 440 „ aspera (Dana) 440 „ danae (Stimps.) . 440 „ fusca (Bate) 440 „ indica (Dana). 440 „ Kürgensis (Gerstf.). 440 „ massavensis (Kossm.) 440 „ pubescens (Dana) . 440 34.Gen.Elasmopus A. Costa 441, 732 1. E. subcarinatus (Hasw.). 441 2. „ diemenensis (Hasw.) . 442 3. „ suensis (Hasw.) . 442 4. „ brasiliensis (Dana) 443 5. „ poeillimanus (Bate) . 443 6. „ delaplata Stebb. 444 7. „ rapax A. Costa . 444 8. „ viridis (Hasw.) 445 9. „ boeckii (Hasw.) . 445 10.. „ insignis Chevreux . 732 11. „ sokotraeA.Walker&A.Seott732 12. „ dubius A. Walker . 732 13. „ spinimanus A. Walker . 733 14. „ serrula A. Walker . 733 15. „ latibrachium A. Walker 733 „ erassimanus (Miers) . 445 „ erythraeus (Kossm.) . 446 „ miersi (Wrzesn.) 446 „ peruvianus (Dana). 446 35.Gen. Plesiogammarus Stebb. 446 1. P. gerstaeckeri (Dyb.) 446 36.Gen.Iphigenella O. Sars . 447 1. I. acanthopoda O. Sars. 447 XXXII Systematic Index page page 37.Gen. Pandorites O. Sars. . 448 23. G. simoni Chevreux . . . 47 1. P. podoceroides O. Sars . 448 24. „ duebeniü Lil. . . .473, 733 38.Gen. Pherusa Leach. . . . 449 25. „.:pulex (1)... % 474 1. P. fucicola Leach . . . . 49 26. „ delebeequei Chevisur & 39.Gen. Niphargoides O. Sars. 450 | Guerne . . ne 1. N. caspius O. Sars . . . 450 27. „ hyaeinthinus Dyb.. a, ı- 2. „ corpulentus O. Sars . . 451 28. „ syriacus Chevreux. . . 475 3. „ compactus O. Sars . .' 451 29.5 locusta: Ch.) 1. 022 4. „ grimmi O.Sars ». . . 452 30. „ camylops Leach . . . 476 5. „ quadrimanus O. Sars . 452 31. „ limnaeus 8.I. Sm. . . 788 6. „ aequimanus O. Sars. . 453 32. „ sarsii Sowinski . . . . 783 7. „ borodini O. Sars . . . 458 33. „ australis Sayce . . . . 733 40.Gen. Phreatogammarus Stebb. 453 34. „ tetrachantus Garbini. . 733 1. P. fragilis (Chilton) . . . 454 35. „ haasei Sayce. . . 733 41.Gen. OmmatogammarusStebb.454 36. „ propinquus W. P. Hiy, 733 1. O. albinus (Dyb) - .» . . 455 37. „ purpurascens W. P. Hay 733 2. „ farus (Dyb.). . 2... 2.455 „ tunetanus E. Sim.. . . 477 3. „ earneolus (Dyb) . . . 456 45. Gen. Poekilogammarus Stebb. 477 4. „ amethystinus (Dyb.). . 456 1. P. pictus (Dyb). .. . ..22498 42.Gen. Odontogammarus Stebb. 456 |: 2. „ orchestes (Dyb) . . . 478 1. O. calearatus (Dyb) . . . 457 | : 3. „ talitrus (Dyb.) . ... . 478 2. „ margaritaceus (Dyb.) . 457 4. „ araneolus (Dyb.) . . . 479 43. Gen. Dikerogammarus Stebb. 458 | 46.Gen.Echinogammarus Stebb. 479 1. D. macrocephalus (©. Sars) 458 1. E. berilloni (Catta). . . . 481 2. „ haemobaphes (Eichw.) . 458 2. „ verrucosus (Gerstf.) . . 481 3. „ grimmi (0. Sars) . . . 459 3. „ saphirinus (Dyb.) . . . 482 4. „ verreauxii (Bate) . . . 459 4. „ ezerskii (Dyb) . . . . 482 5. „ fasciatus (Say)... . 460 5. „ maacküi (Gerstf) . . . 483 44, Gen: Gammarus F.. . .460, 733 6. „ lividus (Dyb) . »... 48 1. G. guernei Chevreux . .462, 733 7. „ viridis (Dyb) . 2... 484 2. „ abbreviatus O. Sars . . 462 8. „ cyaneus (Dyb).. . . . 484 3. „ annulatus S.I. Sm. . . 463 9, „ ochotensis (F. Brandt) . 484 4. „ natator S.I. Sm. . . . 463 |. 10. „ testaceus (Dyb.) . . . 485 5. „ obesus O. Sars . . . . 464 11. „ sophiae (Dyb.) . . . . 48 6. „ macrurus O. Sars . . . 464 12:>,° IaBens (Byb).. 27% 1 So 7. „ compressus O. Sars . . 465 13. „ murinus (Dyb.). . . . 486 8. „ subnudus ©. Sars . . . 465 14. „ aheneus (Dyb.). . . . 487 9. „ deminutus Stebb.Y . . 466 15. „ sarmatus (Dyb) . . . 487 10. „ similis O. Sars . ... . 466 16. „ capreolus (Dyb.) . . . 488 ll. „ weidemanni O. Sars. . 467 17. „ ussolzewi (Dyb.) . . . 488 12. „ maeoticus Sowinski . . 467 18. „ stenophthalmus (Dyb.) . 489 13. „ erassus O. Sars. . . '. 467 19. „ schamanensis (Dyb.). . 489 14. „ warpachowskyi O. Sars. 468 20. „ leptocerus (Dyb.) . . . 490 15. „ pauxillus O. Sars . . . 469 21. „ toxophthalmus (Dyb.) . 490 16. „ kietlinskii Dyb.. . . . 469 22. „ vittatus.(Dyb) . » .. .:491 17. „ andrussowi O. Sars . . 469 23. „ petersü (Dyb.) . . . . 4 18. „ ischnus Stebb. . . . . 470 24. „ violaceus (Dyb.) . . . 492 19. „ plaeidus ©. Sars . . . 470 26.:, Ibex (Dyb) :.%........5 SDR 20. „ platycheir O. Sars. . . 471 26. „ parvexii (Dyb.). . . . 49 21. „ pungens M.--R.. . . . arı 27. „ polyarthrus (Dyb.) . . 49 22. „ marinus Leach . . . . 472 „ mutilus (Abildg.) . . . 49 page 7.Gen. Heterogammarus Stebb. 494 1. H. stanislavii (Dyb.) . . . 49 „ sophianosü (Dyb.). . . 49 „ eapellus (Dyb.). . . . 49 „ ignotus (Dyb.) . . . . 49 BOLD. de ana. 0486 „ albulus (Dyb.) . .» » . 496 „ bifaseiatus (Dyb.).. . . 496 „ branchialis (Dyb.). . . 497 48.Gen.Parapallasea Stebb. 497, 733 . borowskii (Dyb.) . .498, 733 lagowskii (Dyb.) . .498, 733 puzyllii (Dyb.) . . .498, 734 .Amathillina O. Sars . 499 . cristata O. Sars ... .'49 re a maximoviczi O. Sars . 500 spinosa O.Sars. . . . 501 affınis ©. Sars . . . . 501 .Carinogammarus Stebb. 501, 734 C. cinnamomeus (Dyb.). . 502 „ wagii (Dyb.).. . . .502, 784 „ pulehellus (Dyb.) . . . 508 „ seidlitzi Dyb). . . . 508 rhodophthalmus (Dyb.). 504 „.caspius (Pal) .. . .. 504 . „ atchensis (F. Brandt). . 505 . „ subcarinatus (Bate) . . 505 . „ roeselii (Gerv.) . . . 506 macrophthalmus (Stimps. ) 506 mucronatus (Say) . .506, 734 roseus (Garjajeff) . . . 734 ruber (Garjajeff). . . . 734 .Gammaracanthus Bate 507 . lacustris O. Sars . . . 507 loricatus (Sab.). . . . 508 caspius O. Sars. . . . 508 .Acanthogammarus Stehb. 508, 734 .cabanisii (Dyb.). . .509, 734 zienkowiczii (Dyb.) .509, 734 „ godlewskii (Dyb.).. .510, 734 „ radoszkowskii (Dyb.) 510, 735 „ armatus (Dyb.).. . .511, 735 ‚parasiticus (Dyb.).. .511, 735 labbei Chevreux. . . . 734 ‚ albus (Garjajeff). . . . 734 „ balkirii (Garjajeff).. . . 734 „ flavus (Garjajeff) . . . 734 eonFnppmH S pusilla O0. Sars . . . . 500. Systematic Index XXXIll page A. korotneffii (Garjajeff). . 734 „ maximus (Garjajeff) . . 734 Gammarus caudisetus Viv.. . . 512 ». «hilonsis. Nie’. .....4 2.0, BI8 „ ereinnatus. Vi... .. . 512 „ crassimanus Viv. . . . .. 512 „. .dubius: Johnst: -......:. ... 512 „ fabellifer Stimps. . . . . 513 „ fontinalis A. Costa. . . . 518 .. Minus. Say. zn 2. 518 „ . peloponnesius Guer. . . . 518° „ podurus Abilde.. . . . . 513 »0BVI MARS Bl BER A Re 5 RB Bieso Dura DEN BE 31. Fam. Dexaminidae. . . 514 1.Gen.Dexamine Leach . .514, 735 D.spinosa (Mont). . . .. 515 „ thea Boeck . . . 516 spiniventris (A. Costa) . 516 „ blossevilliana Bate . . 517 „ serraticrus A. Walker . 735 -'„ anisopus (Grube) . . . 517 „ leptonyx (Grube) . . . 517 ae a „. miersii Hasw. . . . . 51% „ seitulus Harford . . . 517 2.Gen. Tritaeta Boeck. . . . 517. 1. T. gibbosa (Bate) . . . . 517 3.Gen. Paradexamine Stebb... 518. 1. P. pacifica (G. M. Thoms.). 518 4.Gen. Polycheria Hasw. .519, 735. 1. P. antarctica (Stebb.). . . 520. 2. „ tenuipes Hasw. . . . 2 520 3. „ atolli A. Walker. . . . 735. 5.Gen.Guernea Chevreux . . 521 1. G. coalita (Norm.) . . .521, 735 2. „ nordenskiöldii (H. J. Hansen) . . re DAR „ flindersi (Stebb.) ie. 522 33, Fam. Talitridae. ar ER 1.Gen. Talitrus Latr. . . . . 54 1. T. sylvaticus Hasw. . . . 524 2. „ alluaudi Chevreux. .525, 735 3. „ saltator (Mont). . . . 53 4. „ gulliveri Miers . 2. . 526 „ eloquetii (Aud.). . . . 526 „ fissispinosus (Kossm.) , 526 In XXXIV Systematie Index page page . 7 2.Gen. Talitroides Bonnier. . 527 10. T. megalophthalma (Bate) 549 2 1. T. bonnieri Stebb.+ . . . 597 11. „ longicornis (Say) . . . 54 i { E 12. ollieifera (Stimps.) . . 550 3.Gen. Orchestoidea Nie. . . 527 ige P . O. tuberculata Nie. . . . 527 eg ; 14. „ telluris (Bate) . . . . 551 L 15. „ gracilis (Dana). . . . 551 7 . „ Pugettensis (Dana) . . 529 16. „ spinipalma (Dane) . . er . „ brasiliensis (Dana) . . 529 17. „ brito Stebb. eh Sa. 18. „ novaehollandiae Stebb.. 553 4 4.Gen. Orchestia Leach . .580, 735 19. „ martensii (M. Weber) . 553 . 0. mediterranea A. Costa . 531 „ africana Bate. '. . . . 554 { . „ gammarellus (Pall.). . 582 „ C00KE ilk. 3 re 90 . „ Chevreuxi Guerne . . . 533 6.Gen.Ceina Della Valle. . . 554 .„ montagui Aud.. . . . 533 | ° 1.(, egregia (Chilton) . . . 554 1 2 3 4 | n „ tucurauna Fr. Müll. . . 534 | 7,Gen.Chiltonia Stebb. . .555, 785 | 7 8 9 4 2. „ fischeri M.-E). . . . 528 3. „ ealiforniana (F. Brandt) 528 4 5 nn ee En IRRE Er 1. C. mihiwaka (Chilton) . . 555 .„ as nn ie ONE sr: 2. „ australis (Sayce) . . . 735 Sorh. PORERAAMN DER: > 2.4 80 3. „ subtenuis Saycee . . . 785 . „ guernei Chevreux . .„ . 5836 \ 10. „ marmorata (Hasw) . . 536 8.Gen.Parhyale Stebb. . . . 556 1. P. fascigera Stebb. . . . 556 * a Zn 1 A u a ine 11. „ capensis Dana . . . .„ 587 12. „ chiliensis M.-E.. . . . 537 | 9.Gen.Neobule Hasw. . . . 556 13. „ dentata Filh.. . . . „587 1.N. gaimardii (M.-E) . . . 556 | 14. „ selkirki Stebb. . . . . 588 „ armorica (M.-E) . . . 557 15. „ pickeringii Dana . . . 588 „ reynaudii (M.-E.) . . . 557 \ 16. „ nitida Dana . » . . . 539 | 10.Gen.Parorchestia Stebb. . 557 - 17. „ humicola Marts. . . . 5839 1. P. tenuis (Dana). . . . . 557 2 18. „ floresiana M. Weber . . 539 2. „ hawaiensis (Dana). .558, 735 E 19. „ grillus (Bose). . . . . 540 3. „ sylvicola (Dana) . . . 558 ; 20. „ platensis Kroyer . . . 540 | 11.Gen.Hyale H. Rathke . .559,735 } 21. „ sulensoni Stebb. . . . 541 22. „ parvispinosa M. Weber. 541 23. „ montana M. Weber . . 542 . „ campbellica (Filh) . . 562 24. „ anomala Chevreux . . .785 . „ diplodactyla Stebb. . . 562 1.H. earinata (Bate) . . . . 561 2 3 4 25. „ excavata Chevreux . . 7855 5. „ galateae Stebb.. . . . 563 6 7 8 9 . „ ochotensis (F. Brandt) . 561 beaueoudraii (M.-E.). . 542 al a al un nun nn m ” ki . „ maroubrae Stebb.. . . 563 „ 60n8 nn A. Costa . . 542 . „ graminea (Dana) . 564 2 7 TEEN Ri von RR . „ hirtipalma (Dana). . . 564 ” Rh gr ne : en Fe macrodactyla Stebb. 564, 736 3 iin ende 10. „ aquilina (A. Costa) . . 565 4 „ rectimana Dana . . . 543 11. „ prevostii (M.-E.) . .565,736 ° 7 5.Gen. Talorchestia Dana . . 543 12. „ grandicornis (Kroyer) . 566 L 1. T. seutigerula (Dana) . . 544 13. „ novaezealandiae (G. M. 2. „ darwinii (Fr. Müll.) . . 545 PROBE 20 0 7 . Bere (Aud.) . . 545,735 . . grimaldii en 567, 736 . „ tridentata Stebb. . . . 546 . „ erassicornis (Hasw.).. . 568 ” ” s 5. „ pravidactyla Hasw. . . 546 16. „ pontica H. Rathke. . . 568 6. „ limicola Hasw. . . . . 547 17. „ media (Dana) . . . . 569 7. „ quoyana (M.-E) . . . 547 18. „ perieri (H. Luce.) . . . 570 8. „ quadrimana (Dana) . . 548 19. „ camptonyx (Heller) 570, 736 9; „ diemenensis Hasw. . . 548 20. „ schmidtii (Heller). . . 571 a u na am 3 nn u nn nn u alu a H. nigra (Hasw.) ” nn Me = Ze Senn- iur. Kan Dan mer - Do, Wi Fun Bu? rubra (G. M. Thoms.). chiltoni G. M. Thoms. brevipes Chevreux. . babirussa (A. Costa) . . buechichi (Heller) . gazella (A. Costa) . georgiana (Pfeff.) . gracilis (Dana) . 'hawaiensis (Dana). helleri (Grube) . nudicornis (Heller) orientalis (Dana) piedmontensis (Bate) pugettensis (Dana) rudis (Helle) .. . . rupicola (Hasw.) - seminuda (Stimps) . . stebbingi Chevreux .574, stewarti (Filh.) . stolzmani Wrzesn.. tenella (A. Costa) . . . villosa S. I. Sm. Sp., (Hasw.) .Hyalella S. I. Sm. .574, . azteca (Sauss.) ; echinus (Faxon). longipes (Faxon) lucifugax (Faxon) . latimana (Faxon) . longipalma (Faxon) . armata (Faxon) . longistila (Faxon) . cuprea (Faxon) . inermis 8. I. Sm. . jelskii (Wrzesn.). . » . dybowskii (Wrzesn.) . lubomirskii (Wrzesn.) meinerti Stebb. . warmingi Stebb. richardi Chevreux . 4 neveu-lemairei Chevreux pernix (Moreira) .Allorchestes Dana . . novizealandiae Dana. compressus Dana . malleolus Stebb. plumicornis (Heller) . humilis Dana angustus Dana . brevicornis Dana . 571 572 735 735 572 572 572 572 572 573 573 573 573 573 573 573 573 574 736 574 574 574 574 574 736 575 576 576 576 577 577 577 577 578 578 578 579 579 579 580 , 736 736 736 58l 581 58l 582 583 584 584 584 page A. istricus (Grube) . 584 „ Japonicus Stimps. . 584 „ littoralis Stimps . .585, 736 „ patagonicusR.O. Cunningh. 585 „ paulensis Heller 585 „ penicillatus Stimps. 585 „ Plumulosus Stimps. 585 „ rubricornis Stimps. 585 SWIE RUE: 5 585 „ Stylifer Grube . . . „ 585 „ Sp Heller . 585 33. Fam. Aoridae. . . . .585, 736 1.Gen. Aoroides A. Walker. 586 1. A. columbiae A. Walker 586 2.Gen.Aora Kroyer. 587 1. A. typica Kroyer . 587 3.Gen.Mierodeutopus A. Costa 588 1.M. chelifer (Bate) 589 2. „ armatus Chevreux . 589 3. „ gryllotalpa A. Costa. . 590 4. „ stationis Della Valle . 590 5. „ haswelli Stebb. . 591 6. „ anomalus (H. Rathke) 591 7. „ propinquus O. Sars 592 8. „ megnae Giles 2 DIR 9, „ versiculatus (Bate) .598, 736 10. „ damnoniensis (Bate) 593, 736 „ titii Heller . . +59 4.Gen.Lembos Bate . . .59, 737 1. L. longidigitans (Bonnier). 595 2. „ arcticus (H. J. Hansen) . 595 3. „ Spiniventris (Della Valle) 593 4. „ hirsutipes Stebb. 596 5. „ megacheir (O. Sars) 596 _ 6. „ longipes (Lilj.) . 597 7. „ pbilacanthus (Stebb.) 598 8. „ kergueleni (Stebb.) 598 9. „ websterii Bate 799 10, „ smithi.(S. J. Holmes) 737 11. „ podoceroides A. Walker 737 12. „ chelatus A. Walker 737 „ fuegiensis (Dana) . 600 „ tenuis (Dana) 600 5.Gen.Lemboides Stebb. 600 1. L. afer Stebb. 600 2. „ australis (Hasw.) 601 6.Gen. Dryopoides Stebb. . 601 1. D. westwoodi Stebb. . 601 AXXV III* XxXVI Systematie Index page { page 7.Gen. Paradryope Stebb. . . 602 6.Gen. Megamphopus Norm... 621 1. P. orguion Stebb. . . . . 602 1. M. cornutus Norm.. . . . 621 8.Gen.Coremapus Norm. . . 736 7.Gen.G@oösia Boeck . . .. 62 1. C. versiculatus (Bate) . . 736 1. G. depressa (Goös). . . . 622 8.Gen. Protomedeia Kroyer 623, 738 1. P. faseiata Kroyer. . . . 638: 34. Fam. Photidae . . . .603, 737 2. „ grandimana Brüggen . 738 1.Gen. Microprotopus Norm. 604 9.Gen.Xenocheira Hasw. . . 64 1.M. maculatus Norm. . . . 604 1. X. fasciata Hasw. . ... . 624 2. „ longimanus Chevreux . 605 10. Gen.Leptocheirus Zadd. . 625 „ emissitius (Dana) . . . 605 L. cornuaurei Sowinski . . 626 „ hirsuticornis (Dana) . . 605 „ aberrans (Ohlin) . . . 626 „ minutus Sowinski . . . 605 „ Pinguıs (Stimps.) . .627, 738 2.Gen.Photis Kreyer . . .605, 738 hirsutimanus (Bate) . . 627 „ dellavallei Stebb.. . . 628 EEE 1. P. brevicaudata Stebb. .. . 606 ; % 2. „ reinhardi Kroeyer . . . 607 Dr 3. „ macrocarpa. Stebb. . . 607 Eon SERBMERE. (Grabe) 2 >) um 4 r longicaudata (Bate R „ trieristatus (Chevreux) . 629 ar Westw) 608 „ pilosus Zadd.. . . . 630 Ta gr 11.Gen. Cheiriphotis A. Walker 737 | 5. „ tenuicornis O. Sie 2, 2608 - 2 1. ©. megacheles (Giles) -. . 787 6. „ longimana A. Walker . 738 12.Gen. Audulla Chevreux . . 737 ® un z kai en. 2 1. A. chelifera Chevreux . . 737 RB ERDE) 2120 0 AND 13.Gen. Bonnierella Chevreux . 737 3.Gen. Haplocheira Hasw.. . 609 1. B. abyssi (Chevreux) . . . 737 1. H. barbimana (G.M. Thoms.) 609 9, i abyssorum (Bonnier) N 4.Gen. Eurystheus Bate. .610,738 | 14.Gen.Chevalia A. Walker. . 737 1. E. atlantieus (Stebb.). . . 611 1. C. avieulae A. Walker . . 737 2. „ afer (Stebb.) -i« ... . 612 _— 3. „ thompsoni (A. Walker) . 612 | 35. Fam. Isaeidae. . . . . . 630 4. „ crassipes (Hasw.) . . . 612 1.Gen.Isaea M.-E. . . . . . 630 5. „ thomsoni (Stebb.) . . . 618 1. L montagui M.-E. . . . 630 6. „ ostroumowi (Sowinski) . 614 Be : 7. „ exsertipes (Stebb.). . . 614 | 36. Fam. Ampithoidae.. . . 631 8. „ hirsutus Giles . . „615, 737 1.Gen. Ampithoe Leach . .631, 738 9. „ dentifer (Hasw) . . . 615 1. A. megaloprotopus (Stebb.) 633 10. „ longimanus (Chilton) . 616 2. „ lacertosa (Bat). . . . 688 11. „ palmatus (Stebb. &D. 3. „'cinerea (Hasw.). - . 634 Roberts)... . 616 4. „ longimana (8. I. Sm.) 634, 738 12. „ chiltoni (G..M. Thoma). 617 5. „ quadrimana (Hasw.). . 635 13. „ maculatus (Johnst.) . . 617 6. „ valida (8. I. Sm.) . .685, 738 14. „ dentatus (Cheyreux) . .. 738 7. „ mitsukurii (Della Valle). 635 18. tenuicornis (S.J. Holmes) 738 8. „ flindersi (Stebb) . . . 685 16. „ zeylanicus (A. Walker) . 738 9. „ humeralis (Stimps) . . 636 17. „ gardineri (A. Walker) . 738 10. „ femorata (Kroyer). . . 636 5.Gen. Podoceropsis Boeck . 618 11. „ brevipes Dana). . . . 687 1. P. abyssi Chevreux . .619, 787 12. „ brasiliensis (Dana) . . 687 2. „ kermadeei Stebb. . . . 619 ‚13. „ kergueleni (Stebb.) . . 638 3. „ lindahlii H. J. Hansen . 619 14. „ japonica (Stebb.) . . . 638 4. „ sophia Boeck. . . . . 620 15. „ vaillantii (H. Luce) . . 639 5. „ nitida (Stimps.) . . . 620 16. „ rubrieata (Mont) . . . 639 A. Seott . 17. A. inda (M.-E.) 18. „ alluaudi (Chevreux) 19. „ intermedia (A. Walker) . „ australiensis (Bate) ' „ brusinae (Heller) „ chilensis (Nie.) . „ filieornis (Dana). „ fillgera (Stimps). „ filosa (Sav.) : „ maculata (Stimps.) „ orientalis (Dana) „ pausilipae (M.-E.) . „ punctata Say. „ ramondi (Aud.). „ Stimpsoni (Boeck) . „ tongensis (Dana) „ SP., (Bate & Westw.) . 2.Gen. Pleonexes Bate 1. P. gammaroides Bate 2. „ feroX Chevreux . „ dubius (R. Templ.) „ validus (Czern.). „ Virescens (Stimps.) 3.Gen. Grubia Üzern. 1. G. erassicornis (A. Costa) . 2. „ hirsuta Chevreux } 3. „ microphthalma ne 4. „ longieornis A. Walker & 5. „ compta (S.L Si „ setosa (Hasw.) . ı 4.Gen. Amphithoides an 1. A. longicornis Kossm. '„ eomptus (8. I. Sm.) .645, 2. Gen. Paragrubia Chevreux 1. P. vorax Chevreux . $ 5.Gen.Sunamphitoe Bate . 1. S. pelagica (M.-E.) 6.Gen. Biancolina Della Valle. 1. B. euniculus (Stebb.) . 37. Fam. Jassidae. 1.Gen. Wyvillea Hasw. 1.W.longimana Hasw. . . 2. „ haswelli (G. M. Thoms.) '2.Gen. Parajassa Stebb. . 1. P. pelagica (Leach) 2. „ tristanensis (Stebb.) . 3.Gen. Microjassa Stebb. 1. M. eumbrensis (Stebb. & D. Roberts.) page |; 640 738 138 641 641 641 641 641 641 641 641 641 642 642 642 642 642 738 642 738 643 643 643 , 739 644 738 738 738 739 644 ° ‚645 645 739 739 739 645 739 646 647 647 648 648 648 649 649 650 651 651 Systematie Index XXXVL page 4.Gen.Jassa Leach. . . . 652,739 1. J. dentex (Czern.) . 658 2. „ falcatiformis (Sowinski). 653 3. „ Ingens (Pfeff.) . 653 4. „ pulchella Leach . .654, 739 5. „ pusilla (0.Sars) . .655, 739 6. „ ocius (Bate) . ... .655, 739 7. „ frequens (Chilton). . . 656 8. „ goniamera A. Walker 739 9. „ marmorata S. J. Holmes‘ 739 „ ealifornica (Boeck) 656 „ falecata (Mont.) 656 „ orientalis (Dana) 657 „ ornata (Miers) . . . 657 5.Gen.Ischyrocerus Kröyer 657, 739 1. I. nanoides (H. J. Hansen) 657 2. „ anguipes Kröyer 658 3. „ megacheir (Boeck) 659 4. „ assimilis (O. Sars) . 659 5. „ latipes Kroyer 660 6. „ megalops O. Sars 660 7. „ tenuicornis (O. Sars) . 660 8. „ brevicornis (O. Sars) 661 9. „ tubereulatus (Hoek) 661 10. „ commensalis Chevreux . 739 „ monodon (Heller) . 662 38. Fam. Corophiidae . 662, 739 1.Gen. Concholestes Giles . 663 1. C. dentalii Giles. 663 2.Gen. Paracorophium Stebb. 663 1. P. excavatum (G.M. Thoms.) 664 3.Gen. Camacho Stebb. 664 1. C. bathyplous Stebb. . 665 4.Gen.Cerapus Say . . .665, 740 1. C. erassicornis (Bate). 666 2. „ sismithi Stebb. . 666 3. „ tubularis Say . . .667, 740 4. „ flindersi Stebb... . .668, 740 5. „ abditus R. Templ.. .. 668 6. „ ealamicola (Giles) . .669, 740 5, Gen; Chevreuxius Bonnier . 669 1. C. grandimanus Bonnier 670 6.Gen. Eriethonius M.-E. .670, 740 1. E. brasiliensis (Dana) .671, 740 2. „ pugnax (Dana) . 672 3. „ macrodactylus (Dana) 672, 740 4. „ difformis M.-E. . 672 5. „ hunteri (Bate) . . .673, 740 6. „ megalops (0. Sars) 673 XXXVIHI Systematie Index f page : . page 7. E. rubrieomis (Stimps.). . 740 | 12.Gen. Grandidierella Coutiere 739 „ fasciatus (Stimps.). 674 1. G. mahafalensis Coutiere . 739 „ peculans (Dana) 674 „Sp, Dana... .... 674 | 39. Fam. Cheluridae . . . . 693 7.Gen. Cerapopsis Della Vallle 674 1.Gen. Chelura Phil. er RD 1. C. longipes Della Valle „ . 674 1. C. terebrans Phil. . 693 . 8.Gen. Neohela S. I. Sm. 675 | 40, Fam. Podoceridae . 694 1. N. monstrosa (Boeck) 675 1.Gen. Laetmatophilus Bruz. 695 2. „ phasma S. I. Sm. . 676 1. L. purus Stebb. . . . 696 9.Gen. Unciola Say. 676 2. „ tuberculatus Bruz. 696 1. U. laticornis H. J. Hansen 677 3. armatus (Norm.) 2... 697 2. „ leucopis (Kroyer) . 678 4. „ hystrix (Hasw.) . 697 3. „ Irrorata Say . . 678 2.Gen.Cyrtophium Dana 697 4. „ crassipes H. J. Hansen . 679 1. C, orientale Dana 698 5. „ planipes Norm... . . . 679 2. „ minutum Hasw.. 698 6. „ erenatipalma (Bate) . . 680 „ laeve Heller . 698 7. „ petalocera (0. Sars) . . 681 3.Gen. Leipsuropus Stebb. 698 8. „ incerta Bonnier. 681° 1. L. parasiticus (Hasw.) 699 10.Gen. SiphonoecetesKroyer 681,740 4.Gen.Xenodice Bocck . . . 699 1:8, typleis- Kopien. a 1. X. frauenfeldti Boeck 700 9 allidus O. Sars Bon 5. Gen. Podocerus Leach .700, 741 al EaRN. 2: s f 1. P. cheloniae (Stebb.). . . 701 3. „ eolletti Boeck . 683, 740 9 d NE 4 dellavallei Stebb. . 684 N NN ee) re 5. n ® 3. „ Inconspicuus (Stebb.) 702 . „ sabatieri Rouv. . . . 684 RER i Ä : x obatus (Hasw.) . 708 6. „ orientalis A. Walker. . 740 RE hil 7° „ smithianus Rathbun . 740 er ER LISE NE ” Y kröyeranus (Bate) 684 aSRen Bere Ense R > 6. „ variegatus Leach . 703 11.Gen. Corophium Latr.. .685, 740 7. „ brasiliensis (Dana) 704 1. C. volutator (Pall.). 686 | 8. „ laevis (Hasw.) .704, 741 2. „ nobile O.Sars . . . 687 9. „ danae (Stebb.) . 705 3. „ chelicorne O. Sars 687 10. „ eristatus (G. M. Thoms.) 706 4. „ spinulosum O. Sars 688 11. „ synaptochir (A. Walker) 741 5. „ affine Bruz. Aa 688 12. „ zeylanieus (A. Walker) . 741 6. „ runcicorne Della Valle . 689 6.Gen.Icilius Dana . ; 706 7. „ robustum O. Iars 689 1. I. ovalis Dana 707 8. „ mucronatum ©. Sars 689 7.Gen. Dulichia Kroyer . 708 9. „ curvispinum 0. Sars . . 690 1. D. spinosissima Kroyer . 709 10. „ monodon .O. Sarz . 690 2. „ monacantha Metzg. 710 11. „ crassicorne Bruz. . 690 3. „ aretica J. Murdoch 710 12. „ bonellii (M.-E). 691 4. „ macera O0. Sars . 710 13. „ maeoticum Sowinski . 740 5. „ hirticornis O. Sars zı1 14. „ triaenonyx Stebb. . 740 6. „ normani O. Sars zı „ acherusicum A. Costa 692, 740 7. „ nordlandica Boeck zı1 „ eontraetum Stimps. . 692 8. „ falcata (Bate) 712 „ eylindrieum (Say). .692, 740 9. „ porrecta (Bate) . 712 „ dentatum Fr. Müll. 692 10. „ tuberculata Boeck. 713 „ quadriceps Dana 692 8.Gen. Paradulichia Boeck 713 „ salmonis Stimps. 692 1. P. typica Boeck . 714 „ Spinicorne Stimps. 692 psis O. Sars 714, 741 Ka: PER Be FRE a In a Bl la in Se ET ad Bu ee ? f al Bl he Ze ua Me en ri ne a 2 ERPAEIT Amphipoda 1775 Gen. Gammarus (part.) + Gen, Oniscus (part.), J. C. Fabrieius, Syst. Ent., p- 418, 296 | 1798 Subgen. Gammarellus (part.), J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p.106 | 1802 Fam. Gammarinae (ex Ord. Branchiogastra), Latreille, Hist. Crust. Ins., v.3 p.38 | 1813/14 Trib. Gasteruri (part.), Leach in: Edinb. Ene., v.7 p.386 | 1815 Leg. Edriophthalma (part.), Leach in: Tr. Linn. Soc. London, v.11 p.307, 352 | 1816 & 17 Ord. Amphipoda, Latreille in: Nouv. Dict., ed.2 v.1 p.467; v.8 p.493 | 1888 Subord. A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.601 | 1890 A., G.O. Sars, Crust. Norway, v.1 p.3. Head carrying 2 pairs of antennae, the mandibles, 2 pairs of maxillae, and the basally coalesced maxillipeds. Cornea of eyes not divided into facets. Peraeon consisting usually of 7 seg- ments, each bearing a pair of legs; first segment sometimes fused with head. Pleon consisting normally of 6 segments and the telson, or rudimentary; if normal, bearing 6 pairs of legs, the first three of which, funetioning as swimming organs, differ in structure from the rest. Organs of respiration (branchial vesicles) attached to the peraeon, not to the pleon. Heart (in a pericardiac sinus) neverexceedinghinderlimit of peraeon, with aorta also at posterior extremity. Antennal gland present, though sometimes small. The body, often compressed, sometimes depressed, or piriform, or even rodlike, consists of head, peraeon and pleon. The number of its free segments reaches 15 (head 1, peraeon 7, pleon 7). First segment of peraeon sometimes coalesced with head, rarely with 24 segment of peraeon; fusion of the last 2 segments of peraeon occurs. Pleon often as long as peraeon, or even rather longer; the limits between the hinder segments occasionally disappear; in the Caprellidea the pleon is rudimentary. The last pleon segment is the telson. Appendages of head: 1) First antenna; peduncle of 3 (rarely fewer) joints, with a many-jointed primary flagellum and usually a shorter accessory flagellum. 2) Second antenna; peduncle of 5 joints, with one flagellum; the first 2 joints of peduncle are short and not always distinct; the 24 usually with a conical process (gland-cone) for the opening of the antennal gland. The length of antenna 1 and 2, in proportion to each other and to the body varies within wide limits. 3) Mandible (Fig. 7,8 p. 30, 32); basal joint provided with masticatory structures; palp with 3 or fewer joints, or absent. Between the mandibles the upper lip, attached to the epistome, and the lower lip frame the entrance to the oesophagus. 4) First maxilla (Fig. 78 p. 333) consisting of 5 joints; the palp, that is the 4th and 5tk joints, not rarely wanting. 5) Second maxilla (Fig. 88 p. 476) consisting of 3 joints. In maxilla 1 and maxilla 2 the 24 joint is indistinet, Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. ı Eye, x Head, \ ER, IT TER RR De % „Antenna 2 nn \ Fe Mandible RR Aorta anterior. r ENT: - Ma “77 od ....Gnalhopod 1 Flage he —S) Jeraeon Segmentl. EN /g & Fi * S age 3 / al $ GA 2 1... alm S Heart-- ZN x j DS RER Peraeonod 1 Ds EN Tun GE -- Peraeonod 2 nam Ss Telson-‘; Pleon Segment 6-° N Fig. 1. Scheme of a male of the legion Gammaridea. Amphipoda Bi | and the 1° and 39 are each expanded to a plate, provided with denticles and spines. 6) Maxilliped (Fig. 49 p. 186) 7-jointed; first joint, sometimes also the 24, of the one maxilliped fused with that of the other maxilliped; 4th _7th joints forming the palp; 1 or 2 or 3 joints of.the palp sometimes wanting; articulation still more reduced in the Hyperiidea. Each segment of peraeon commonly carries one pair of legs. The 7 legs of peraeon are divided into 2 groups: the 1°t—4!b leg, and the 5th—_7th Jeg; the former forming an angle open to the front, the latter to the rear; the 34 joint in all of them acts as the knee of the angle. The first 2 legs are called gnathopods (not so much on account of their own function, as from their homology with the 2% and 34 maxillipeds of Decapoda); so legs of peraeon are: 2 gnathopods and 5 peraeopods. - All are uniramous; the normal number of joints is 7. The first joint, greatly enlarged (or perhaps soldered) to the so-called epimera or side-plates in the Gammaridea, is liable to evanescence in the Hyperiidea, and wanting in the Caprellidea; the last joints of gnathopod 1 and 2 usually, of other peraeopods very rarely (except in some genera of Hyperiidea), form a grasping organ. (lose at the base of gnathopod 2 and of the peraeopods there are the branchial vesieles, 2—6 on each side. The legs of the first 3 segments of pleon are called pleopods, those of the 46th segments uropods. The pleopods consist of a basal joint and almost always 2 many-jointed, often flagelliform rami, beset with swimming- setae; the basal joints of each pair of pleopods are often coupled by hooked spines (Fig. 120 p. 696). The rami of the uropods are sometimes 2-, usually 1-jointed; they usually bear spines, which are sometimes uneinate. External sexual characters are found especially in antenna 1 and 2, in the grasping hands of gnathopods and peraeopods, and in the marsupial plates of 0. The ducts of ovaries open in the 5t", those of testes in the 7th segment of peraeon; no proper copulatory organs observed. Among the anatomical characters especially of value for classification are the number, form and structure of the paired eyes, the number of the long midgut-glands (hepato-pancreatic tubes) flanking the intestinal canal, and of the so-called rectal glands; also the number of the venose ostia of the heart and of the un-fused ganglia of the ventral nerve-chain. The eggs are laid in the marsupium, formed by the marsupial plates; the young, when hatching, resemble the adult; only in the Hyperiidea some- times pleon and pleopods are at first scarcely developed. The great majority of the Amphipoda are marine; only among the Gammaridea are there species living in fresh or brackish water, or near the sea above highwater- mark, or even, though exceptionally, far from water in damp places. The Gammaridea . and Caprellidea are extensively litoral, the Hyperiidea pelagie; also in each legion there are species living on swimming animals or floating objeets. The geographical distribution is cosmopolitan, ascertained to within less than 600 km of the north pole, to a depth of 58310 m in the ocean, and in fresh water to a height of 4054 m above sea-level. Their diet is chiefly of animal substances. Some Gammaridea eonstruct dwelling tubes, some live in grooves and hollows, which they burrow in ascidians, sponges or wood. The species, living on or in coelenterata, sponges, tunicates, mollusca, are perhaps commensals, but at least sometimes feed on the body of their host, sometimes, as Phronima, unite feeding with housebuilding. True parasites are the Cyamidae. Parasites of the Amphipoda are Gregarinida, Trematoda and Üopepoda. Long before J. C. Fabrieius’ establishment of the Genus Gammarus, Amphipoda were described under the generic designations of Cancer, Onisceus, Astacus and Squilla. ı* = Amphipoda P. A. Latreille (1802, Hist. Crust. Ins., v.3 p. 38) was the first who united all species known to him of Amphipoda (as at present understood) in one group, the family of Gammarinae, to the exelusion of all other species; later (1816, in: Nouv. Diet., ed.2 v.1 p.467) he devised for the group the name Amphipoda, separating, however, the genera Cyamus and Caprella as Laemodipoda. The limits of our order, generally accepted to-day, were settled by Kroyer (1843, in: Naturh. Tidsskr., v.4 p.490) and J. D. Dana (1852, in: Amer. J. Sei., ser.2 v.14 p.297); from the latter author is derived also the division of the Amphipoda into the 3 tribes of Gammaridea, Hyperiidea and Caprellidea. Only Gerstaecker (1883 & 86, in: Bronn’s Kl. Ordn., v.5ı1 p. 283, 481) regards the Tanaidea as a tribe of Amphipoda. Synoptical diagnosis of the three legions: Head not fused with 1s6 segment of peraeon. Palp ofmaxilliped2-t0o4-jointed. Peraeon with pairs oflegg; 5 or6segments of peraeon with branchial vesieles; 4 segments in @ with marsupial plates; 1st joint of gnathopods 1, 2 and of peraeopods 1---5 forming or united to well developed side-plates. Pleon consisting usually of 7 free seg- ments, carrying 3 pairs of pleopods and usually 8 pairs, atleast 1 pair, of uropods; uropod 1 always with 2 rami. Eyes varying in size and form, 0—4 in number. Hepato-pancreatie tubes 4, rarely 2; reetal glands 2 or 1, sometimes rudimentary. Heart with3 pairs, rarely 1 pair, of ostia. Nerve-chain with 4 ganglia in pleon-segments 14 I. Leg. Gammaridea Headnotfused with lst segment ofperaeon. Maxilli- ped without palp. Peraeon with 7 pairs of legs; 3—5 (6?) segments of peraeon with branchial vesieles; 4segments in with marsupial plates; 1st joint of gnathopods 1, 2 and of peraeopods 1—5 small or wanting. Pleon consisting / usuallyof7 free segments, with3pairs len and3pairsofuropods’'rami of uropods often evanescent. Eyes usually of large size. Hepato-pancreatie tubes 2 or none; rectal glands none. Heart with 2, rarely 3, pairs of ostia. Nerve-chain with 3 or 4 ganglia in the anterior BRAEORES 08 DIBOR Sy ae leer Fa lern II. Leg. Hyperiidea Head fused with 1st segment of peraeon. Palp of maxilliped I- to 4jointed. Peraeon often with fewer than 7 pairs of legs; 2, rarely 3, segments of peraeon with branchial vesieles; 2 segments in @ with marsupial plates; 1st joint of gnathopods and peraeopods wanting. Pleon and itslegsrudimentary. Eyes small,1 pair. Hepato- pancreatic tubes 2; rectal glands none. Heart with 3 pairs‘ of ostia. Posterior ganglia of nerve-chain very small, none almatedin pleop 3... 2 ur. me An Ran N III. Leg. Caprellidea SE I © an a re ir a a ET le ah > Au. ie un ul un non 410 I. Leg. Gammaridea 1852 Subtrib. Gammaridea, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.308 | 1853 Subtrib. @., J. D. Dana in: U. S. expl. Exp.. v. 1311 p. 806, 825 | 1861 Trib. \ . Prostomatae + Gammaridae, A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 637, 639 | 1888 Trib. Amphipoda Gammarina, T. Stebbing in: Rep. Voy. Challenger, v.29 p.601 | 1890 Trib. Gaämmaridea, G. O.Sars, Crust. Norway, v.1 p.21 | 1893 Subord. Gammarini, A. Della Valle in: F. Fl. Neapel, v.20 p. 297. Head not fused with 1° peraeon segment. Eyes usually compound, even when externally simple, but sometimes reduced to mere pigment patches or entirely absent; normal number 2, varying to 1, 3, 4 or 6 (p. 104); the cornea of each eye sometimes forming a lens*). Antennal consisting of 3-jointed E- peduncle and flagellum, with or without accessory flagellum. Antenna 2 longer or shorter than antenna 1 or equal to it; peduncle apparently 5-jointed, usually with conical process (gland-cone) opening on 2% Joint. The joints of one or both antennae in J, or in d and O, sometimes carrying membranaceous appendages (calceoli, Fig.82 p.347). Epistome flat or projecting. Upper lip with distal margin of outer plate smooth or variously bilobed (Fig. 41 p.163). Lower lip divided into 2 prineipal lobes, prolonged backward into the so-called mandibular processes, and often having between them 2 smaller inner lobes (Fig. 71 p. 278, Fig. 102 p. 598). Mandible (Fig. 77 p. 333) normally composed of basal joint and 3-jointed palp; the basal joint produced to a dentate cutting edge with adjacent accessory plate on inner side and armed with a spine-row between the cutting-plates and the molar, which is a prominent denticulate tuberele; each one of the features some- times degraded or absent (Fig.2 p.12, Fig.21 p.96). Maxillal, 1° and-34 joints with expansion (inner and outer plate), surmounted by spines, which are usually furcate or serrate; 4" and 5b joints forming the so-called palp (Fig. 78 p. 333, Fig. 87 p. 476); the parts, especially inner plate and palp, liable to evanescence. Maxilla 2, 18° and 34 joints with expansion (inner and outer plate); the plates very variable in relative size, rarely wanting, usually in part fringed with setae or slender spines (Fig. 88 p. 476). Maxillipeds (Fig. 49 p. 186, Fig. 54 p. 208), 24 and 34 joints usually with expansion (inner and outer plate); palp 2—4-jointed. Peraeon of 7 distinet segments, rarely reduced to 6 by coalescence of the last two. Legs of the peraeon overlapped at base by the side-plates, developed from or soldered to the 1° joints of the legs; the first 4 side-plates usually larger than the 3 following, the 4! commonly the largest, but with many exceptions. Gnathopods 1 and 2 have the 4tk joint not end to end with the 5t%, but more or less underpropping it, and the 6! joint generally more or less expanded to form the so-called hand. The branchial vesicles, usually attached to gnathopod 2 and peraeopods 1—4 or 1—5, are simple, twisted, pleated or divided into leaf-like lobes; simple accessory vesicles rare. In the O peraeon segments 2—5 are furnished at the *) Articulated eye-lobes without visual elements attributed to Ingolfiella Hansen 1903 (see p. 726). 6 Gammaridea proper age with marsupial plates, fringed with simple setaee The pleon segments 1—3 are always distinct; the pleopods are almost always biramous; the peduncles often connected by coupling-spines (Fig. 14 p. 83); therami usually tapering, many-jointed, each joint with a pair of plumose setae; the 1° joint of inner ramus often having on its inner margin spines cleft at the apex. Pleon segments 4—6 are usually distinet; outer ramus of the uropods sometimes 2-jointed; uropod 1 never absent, and always biramous; of uropods 2 and 3 rarely one or both obsolete, or without one or both of the rami. Telson (probably) never absent, sometimes divided to the base, sometimes not divided at all, and exhibiting every intermediate gradation. Distribution see above pag. 3. 41 Families, 304 accepted and 9 doubtful genera, 1076 accepted species and 257 doubitful. Synopsis of the families:*) Antenna 1 (Fig. 3, 6, 9, 12), 1st joint stout**), with accessory flagellum; mandible (Fig.7,8), eutting edge almost smooth***), with palp; gnathopod 2 (Fig. 10, 11), z sr ’ gar TamE Biongetei sa. a a 1. Fam. Lysianassidae . . p. These characters not eombined — 2. Body (Fig. 18) plump; antenna 1 (Fig. 19) F: with accessory flagellum; mandible 2 (Fig. 17, 21) without molar, without a a ET ER 2. Fam. Stegocephalidae . p. These characters not combined — 3. Head (Fig. 25) tapering, truncate; eyes, when | present, externally simple, usually 4; 3 antenna 1 without accessory flagellum; L; These characters not combined — 4. Antenna 1 (Fig 30—32) with accessory flagellum; mandible with palp normal; peraeopods 3—5 (Fig. 35—38) adapted for burrowing by expansion of joints and | armature of spines and setae — 5. These characters not combined — 6. eg Peraeopod 4 not greatly BE than peraeo- 4 DO BI Nr Re en 4. Fam. Haustoriidae . . p.118 a Peraeopod 4 greatly longer than peraeopod5 5. Fam. Phoxocephalidae . p. 133 I A & 3 (Fig. 39) biramous; telson elongate, tapering, enge. - - ... 2.2.0. 6. Fam. Amphilochidae. . p. 148 These characters not combined — 7. Antenna 1 without accessory flagellum; - | maxillipeds (Fig. 44, 49, 51, 54) more or less abnormal; telson entire — 8, These characters not combined — 16. [ Gnathopod 1 (Fig. 42) chelate — 9. Gnathopod 1 (Fig. 45) not chelate — 10. Upper ip ineised ; maxillipeds normal; uropod ; | *) For some of the imperfections in this synopsis the reader is invited to believe that a more or less adequate apology could be offered, were space available for its presentment. **) Except in Amaryllis (Fig. 5 p. 23). ***) Except in Valettia and Podoprion; wanting in Kerguelenia (Fig.2 p. 12). telson (Fig. 24) more or less eleft. .. 3.Fam. Ampeliseidae . . p. 97 2 Sy Al u a a u a ar An un 2 N et en .. D Gammaridea Mandible and maxillae 1 and 2 developed A Mandible weak, maxillae 1 and 2 obsolete 10 Uropod 3 not biramous — 11. Uropod 3 biramous — 14. u Mandible with palp — 12. Mandible without palp — 18. 18 Mandible, 3d joint of palp very short . . Mandible, 3d joint of palp not short. 13 Maxillipeds (Fig. 51) with outer plate obsolete Maxillipeds with outer plate developed . 14 $ Mandible without palp . . ... 2... Mandible with palp — 15. 15 Maxillipeds (Fig. 54) with palp 2-jointed . Maxillipeds with palp 4-jointed Mandible (Fig. 56, 58, 60) with molar weak These characters not eombined — 19. or wanting; kelson more or less divided —17. &® = Maxillipeds (Fig.55), innerplate welldeveloped 16. 17 Maxillipeds (Fig. 59), inner plate small — 18. Gnathopods 1 and 2 (Fig. 57) simple. Gnathopods 1 and 2 strongly subehelate Eyes*), when present, usually dorsal con- tiguous or confluent (Fig. 61, 62) — 20. Eyes*), when present, lateral — 22. - Antenna 1 (Fig. 67) without accessory flagel- lum; mandible, 3d joint of palp large; peraeopod 5 (Fig. 64) much longer than peraeopod 4; telson entire Antenna 1 (Fig. 70) with accessory flagellum ; mandible, 3d joint of palp small; peraeo- pod 5 not exceptionally longer than peraeopod 4; telson usually eleft**) — 21. Peraeopods 1 and 2 with 4th and 5th joints N Peraeopods 1 and 2 with 4th za 5th joints not dilated Side-plate 4 (Fig. 84) usually excavate behind; peraeopods1 (Fig.91)and2notglandular; telson (Fig. 81, 100) variable; animal usually not domicolous — 28. Side-plate 4 usually not excavate behind; peraeopods 1 and 2 frequently glandular; telson (Fig. 115, 118) entire; animal usually domieolous — 831. Mandible (Fig. 77) with palp — 24. Mandible (Fig. 90) without palp — 80. Telson entire —. 25. Telson cleft — 27. Telson variable, usually cleft; antenna 1 usually with accessory flagellum. . . . 1 0 19 | | | | | H Mandible without palp | \ | | | = 1 37. 18. 19. 20. 21. 30. Fam. Gammaridae . . Fam. . Fam. . Fam. . Fam. . Fam. . Fam. . Fam. . Fam. . Fam. Fam. Fam. Fam. Fam. Fam. Fam. Leucothoidae Anamixidae .. . Metopidae ... . Cressidae Stenothoidae . . . Phliantidae Colomastigidae. . Lafystiidae Laphystiopsidae . Acanthonotozo- matidae Pardaliscidae Liljeborgiidae . . Oedicerotidae . Synopiidae. . Tironidae ‚p ?” ME - P. 270 ‚pe vr MF r ‚2.30 v MM *) In the case of blind species or exceptional genera like Ommatogammarus the distinguishing charaeters under 20 and 21 will give assistance, and for the Gam- marids of Lake Baikal the locality will be a guide. **) Except in Bruzelia (p. 274). 8 Gammaridea, Lysianassidae Rosa WARE. a a 22. Fam. Calliopiidae. . . p.285 R> stram well marked — 26. Side-plates 1—4 rounded; antenna 1 longer tan antenne 2... A 23. Fam. Pleustidae. . . . p.309 Side-plates 1-——4 angular; antenna 1 shorter 25 khan antenna 8... er, 24. Fam. Paramphithoidae p. 320 Pleon segments 5 and 6 coalesced .. . . 25. Fam. Atylidae . . . . p.327 Pleon segments 5 and 6 not coalesced (Fig. 80) — 28. Lower lip, inner plates rather large; uropod 27 8 groatiy elongate. .. » une. 2. 26. Fam. Melphidippidae . p.834 Lower lip, inner plates small or wanting; uropod3 (Fig. 81) not greatly elongate —- 29. 5; p. 338 Gnathopods 1 and 2, hands powerful (Fig.79) 27. Fam. Eusiridae . .. . 29 Gnathopods 1 and 2, hands not powerful. 29. Fam. Pontogeneiidae . p.356 Imperfeetly developed eyescoveringthehead 41. Fam. Hyperiopsidae . p.714 31 Eyes, when present, not abnormal — 32. | Uropods2and3 (Fig. 103, 118) developed — 33. 32 2 Uropods 2 and 3 (Fig. 121, 127), one or other wanting or radimentary 2... 40. Fam. Podoceridae. . . p.694 Pleon (Fig. 110) compressed — 34. Pleon (Fig. 115,118), asarule, depressed— 38. Uropod 3 (Fig. 103) not uncinate — 35. Uropod 3 (Fig. 110) uncinate — 37. Gnathopod 1 (Fig. 101) larger than gnatho- Gn 34 ER EN ER 33. Fam. Aoridae. ... .. p. 585 N 1 (Fig. 104, 105) not larger than gnathopod 2 — 386. ne Peraeopods 1—5 subcehelate. .. .... 35. Fam. Isaeidae . . . . p.630 Lower lip with prineipal lobes notched. . 36. Fam. Ampithoidae . . p.631 [> I Antenna 2 (Fig. 116, 117), flagellum not 38 1. Fam. Lysianassidae 1849 Subfam. Lysianassinae, J. D. Dana in: Amer. J. Sei., ser.2 v.8 p. 136 | 1856 Lysianassides, Bate (& Westwood) in: Rep. Brit. Ass., Meet. 25 p.21 | 1857 Lysiassides, Bate in: Ann. nat. Hist., ser.2 v.20 p.524 | 1857 Subfam. Lisianassini, A. Costa in: Mem. Acc. Napoli, v.1 p.173 | 1865 Subfam. Lysianassina + Subfam. Trischizostomatina, W.Lilljeborg in: N. Acta Soc. Upsal., ser.8 v.6 nr.1 p.18 | 1872 Prostomatidae + Subfam. Lysianassinae, A. Boeck, Skand. Arkt. Amphip., v.1 p.94; p.112 | 1874 Lysia- nassidae, Buchholz in: Zweite D. Nordpolarf., v.2 p.299 | 1888 L. + Valettidae, T, Stebbing in: Rep. Voy. Challenger, v.29 p. 606, 723 | 1890 L., G.O. Sars, Crust. Norway, v.1 p.28 | 1893 Lisianassidi, A. Della Valle in: F. Fl, Neapel, v.20 p. 769. Of side-plates 1—5 (Fig. 3, 4, 6) one or more deep (except in Valettia). Eyes (Fig. 3, 6) usually large, paired, rarely reduced each to a single lens (Hippomedon holbölli, Acidostoma sp.), sometimes degraded or absent (triple in Hirondellea). Antenna 1 (Fig.5, 9, 12) not longer than antenna 2, the 1% joint tumid (except in Amaryllis, Fig. 5). Accessory flagellum always present (except in Lepidepecreum longicorne, p. 80). Flagellum of antenna 2 Gnathopod 1 ee ae 28. Fam. Bateidae ... . p.355 Uropod 3, both rami well developed. ... 31. Fam. Dexaminidae . . p.514 Uropod 3, one ramus wanting or very small 32. Fam. Talitridae . . . p.598“ 2 > ur en be m ne m az De a 5 LE a nl ln an u un Nun En a ae Peraeopods 1—5 not subchelate . . . . . 34. Fam. Photidae . . . . p.608 7 Lower lip with prineipal lobes not notehed 37. Fam. Jassidae ... . . p.647 N ER et SE 38. Fam. Corophiidae. . . p. Kr E Antenna 2 (Fig. 119), flagellum spatulate . 39. Fam. Cheluridae . . . p.69B x 1 u a m ern u a Lysianassidae often differentiated ind. Lower lip without inner lobes. Mandible (Fig. 2, 7, 8), eutting edge almost simple (dentate in Valettia and Podoprion, wanting in _ Kerguelenia, Fig. 2); accessory plate generally present on left mandible; | molar seldom very robust; palp 3-jointed. Gnathopod 2 (Fig. 10, 11) usually “ ‚slender and delicate, 3 joint elongate, 5th and 6th spinulose, 7tk minute. = _ Uropod 3 (Fig. 13) biramous (except in Acontiostoma and Stomacontion). = ‚Hepato-pancröatic tubes (so far as known) 4. ' Marine, Synopsis of accepted genera: Mandible (Fig. 2) without distinet eutting we. 1 Re ER ER . 1. Gen. E.- Mandible (Fig. 7, 8) with dlstfogk eutting E edge — 2. 2 2 ee greatly projecting below, more 3 2 | or less stiliform — 3. @ Mouth-organs not stiliform — 6. 3 Eyes and gnathopod 1 dig. 3) powerfully R: oe re ER 2. Gen. Be: , Eyes and gnathopod 1 Wei powerfully deve- Er - loped — 4. 2 4 S Uropod 3 biramous . 0.0... 3. Gen. | U ropod 3 not biramous — 5. > Uropod 3 without rami. ........ 4. Gen. A Uropod 3 with a single ramus. . . . 5. Gen. 6 Blei es it ; 6. Gen. Eyes, when present, paired — 7. 7 Gnathopcd 1 chelate — 8. Gnathopod 1 not chelate — 12. 8 Maxilliped, palp 3-jointed; telson not eleft ° 7. Gen. Maxilliped, palp 4-jointed; telson eleft — 9. Peraeopod 3, 2d joint deeply indentured . 8. Gen. 9 | Peraeopod 3, 2d joint not deeply in- x dentured — 10. S ER; 10 Chela of gnathopod I narrow. .... . 9. Gen 1 Chela of gnathopod 1 broad — 11. a 1 Telson much longer than broad .. ... . 10. Gen Er. Telson not much longer than broad . . . 11. Gen “ Ss Mandible, eutting edge strongly dentate 12. Gen. Mandible, eutting edge not strongly dentate — 13. 13 | Maxzilla 1 without palp . .. ...... 13. Gen. Maxilla 1 with 2-jointed palp — 14. Mandible, molar rather strong; maxilliped, 14 - palp ratherlong; gnathopod 1 subchelate; telson entire or not deeply incised *) 14. Gen. These characters not eombined — 15. . Opisa . Sophrosyne. 49 accepted and 2 doubtful genera, 136 accepted species and 35 doubtful. Kerguelenia . Trischizostoma . Acidostoma Acontiostoma Stomacontion Hirondellea Podoprionella Podoprion Valettia Amaryllis Onisimus Cem Nr - zip . p.12 . p-14 De . p.16 . p.16 . P-25 .*) Onisimus perplexes the arrangement by having the telson sometimes entire, sometimes as deeply cleft as in Paratryphosites (p. 42). From the latter it is separated sometimes has a small notch. by the much shorter outer plates of the maxillipeds. In Lysianassa (p. 37) the telson 10 Lysianassidae 15 Side-plates 1 and 2 (Fig. 6) very small — 16. Side-plates 1 and 2 not very small — 17. 16 Peraeopod 3, 2d joint deeply indentured . 15. Peraeopod 3, 2d joint not deeply indentured 16. 7 Telson entire — 18. Telson eleft — 24. Antenna 2, penultimate joint of pedunele 18 N N a Ehe 5, 17: Antenna 2, penultimate joint of pedunele not dilated — 19. 19 Uropod 3, inner ramus rudimentary . . . 18. Uropod3, inner ramus not rudimentary — 20. 0 Mandible, molar well developed . ... . 19. Mandible, molar weak or obsolete — 21. 91 Maxillipeds, palp 4-jointed -—— 22. Maxillipeds, palp 3-jointed — 23. 99 f Maxilla 2, inner plate narrow . .... . 20. Maxilla 2, inner plate broad. ... . eh E 93 Maxillipeds, inner plate short... .. - 22. Maxillipeds, inner plate long . .... . 23. 4 Telson not deeply eleft — 25. Telson deeply cleft — 29. f Mandible, palp attached over molar — 26. a \ Mandible, palp attached behind molar — 27. 96 Maxillipeds, 4th joint of palp short . . . 24. Maxillipeds, 4th joint of palp long. . . . 25. 97 Gnathopod 1 subchelate ........ 26. Gnathopod 1 not subchelate — 28. Antenna 1, 2d and 3d joints not extremely 28 BE EN Re ya Ah IS 27. Antenna 1, 24 and 3d joints extremely short 28. Side-plate 1, lower front angle coneealed— 30. 29 > Side-plate 1, lower front angle not con- cealed — 31. Maxilla 1 with outer plate, maxilla 2 with inner plate, very broad . ...... 29. Maxilla 1 with outer plate, maxilla 2 with inner plate, not very broad . . . . . 380. 31 Branchial vesicles more or less complex — 32. Branchial vesicles simple*) — 385. Branchial vesicles (Fig. 10) pleated on both sides — 33. Branchial riss pleated on one side only — 33 es Gnathopod = not subchelate. ..... .» 31. Gnathopod 1 subeheläte ........ 32. 34 | Gnathopod 1, finger short. . . . 2... 38. Gnathopod 1, finger lng.. ... .... 34. 35 [ Peraeopod 3, 2d joint deeply indentured . 35. N ng, 94 Joint not deeply indentured — 36. ET In Tmetonyx miersi (p. 75) not quite simple. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Gen. Cyphoecaris. .. . Cyelocaris Lysianella . . Onesimoides . . . Pseudalibrotus . . Nannonyx .... Lysianassa . Perrierella . . Normanion. .. . Paratryphosites Paronesimus . . Orchomene. ... Socarnoides Menigrates.. . . . Socarnes . ... . Hippomedon ... Glycerina u 0 jr P“ Lan; a N Te Do Ba il ua dran (a 3 are Mari rn aa nr E a 7 % un vor a ve ni ab Br re re a Dr Kia Tell Ann a > a ne a rien u 1a Aut ab a a A ee Mandible, palp attached not behind the 36 = molar — 37. Mandible, palp attached behind the molar —— 46. Gnathopod1, finger minute, shrouded among 37 PR er 36. Gnathopod 1, finger not concealed — 38, 38 Gnathopod 1 simple ..... 2... 37 Gnathopod 1 aot simple — 39. 39 Gnathopod 1 imperfeetly subehelate — 40. Gnathopod 1 distinetly subchelate — 41. 40 Side-plates 1—4 closely packed . . .. . 38 Side-plates I—4 not closely packed . . . 39. 4 f Gnathopod 1, 6th joint distally widened . 40. \ Gnathopod 1, 6th joint not distally widened — 42, | Gnathopod 1, 6th joint much longer than 5th 41. 42 2 Gnathopod 1, 6th joint not much longer | than 5th _- 48, Maxilla 2, inner plate not much shorter than 43 | a ER N Be EEE Pe 42. Maxilla 2, inner plate much shorter than outer — 44, 4 f Epistome not projecting . »....... 43 \ Epistome projeeting — 45. 45 Uropod 3, rami foliaceous. ...:.... 44. Uropod 3, rami lanceolate .. .....- 45 46 Epistome with spiniform projeetion . . . 46. Epistome without spiniform projeetion — 47. - a a ER ee BR 47. Antenna 1, 1st joint not carinate, not pro- Antenna 1 (Fig. 12), 1st joint carinate, a duced — 48. 48 f Bodyrobust, epistome sometimes projeeting*) 48. \ Body slender, epistome not Brojecting*) . 49. Lysianassidae, Kerguelenia Gen. . Gen. . Gen. Gen. Gen. Gen. Gen. . Gen. Gen. . Gen. Gen. Gen. Gen. Gen. Scopelocheirus . Centromedon. . Cheirimedon . . Tryphosella Tryphosa Chironesimus. . . Eurythenes . Tmetonyx Tryphosites Lepidepecreum . . Orchomenella Orchomenopsis . . 1. Gm. Kerguelenia Stebb. pe TE 11 . p.61 p: 63 p. 63 . pP: 65 - pP. 66 - P.67 ... P-68 1888 Kerguelenia (Sp. un.: K. compacta), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1219 | 1891 K., G. O. Sars, Crust. Norway, v.1 p.119. Side-plates, especially 4%, large and deep. Antenna 1 short in both sexes, with a dense brush only in JS; antenna 2 more-slender and scarcely longer than antenna 1. Mandible without cutting edge, spine-row, or molar; palp slender, apical (Fig. 2). Maxillae 1 and 2 normal, but very small. Maxillipeds with both plates small; palp elongate. Gnathopods 1 and 2 slender, elongate; 34 joint long, 7% minute; gnathopod 1 simple, gnathopod 2 chelate. 24 joint broad in peraeopods 4 and 5, not in peraeopod 3; 4tk joint broad in peraeopods 3—5. Uropod 3 very small; rami rudimentary. Telson small, rounded, entire. 2 species. *) No distinguishing feature between those two genera seems to be absolutely constant. 12 Kerguelenia, Trischizostoma Synopsis of species: Gnathopod 1, 7th joint curved; peraeopod 3, 2d joint N EEE Tr Eh 1. K. compacta .p.12 Gnathopod 1, 7th joint straight; peraeopod 3, 2d joint Mobea Deere ET ren 2. K. borealis . . p.12 1. K. compacta Stebb. 1888 K.c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1220 t.15a. Body eompact. Side-plates 1—4 deep, 4th greatly excavate behind for the 5%. Pleon segment 3 with postero-lateral angles almost quadrate. Eyes doubtful. Antenna lin ©, 1° joint stout, flagellum 5 joints, accessory flagellum 3 joints. Antenna 2, last 3 joints of pedunele nearly equal, flagellum 4 or 5 joints. Gnathopod 1, 34 joint longer than 4, as long as 5th; 6!" narrow, tapering; 7" small, with 2 setules, one as long as the joint and plumose, projecting from its concave margin. Gnathopod 2 longer than gnathopod 1, 34 joint not quite so long as 5tk; 5tlk much longer than 6, both of them setose; the chela minute. Peraeopods 1 and 2 with 4b joint a little widened. Peraeopod 3, 24 joint not or scarcely expanded, 4! much wider than . the 34 or ‚5th, quite overlapping the latter behind; the 6th rather longer, not broader, than the 5%, Peraeo- pods 4 and 5 with very widely expanded 24 joint, otherwise resembling peraeopod 3, but while 24 joint in peraeopod 5 is much larger than in peraeopod 4, the rest of the limb is smaller. Uropod 1 longer than uropod 2. Colour in spirit light brown. L. about 4 mm. Cumberland Bay [Kerguelen Island]. Depth 230 m. Fig.2. K. compacta. Mandible. 2. K. borealis O.Sars 1891 K.b., G. O. Sars, Crust. Norway, v.1 p.119 1.40 f.2. Perhaps identical with K. compacta. Eyes triangular, imperfect, reddish with white border. Antennal in 9, flagellum 7-jointed, accessory flagellum 4 joints. Antenna lin C, having last 2 joints of peduncle and base of flagellum more swollen and provided with dense brush of setae. Antenna 2, flagellum 7 joints. Gmathopod 1, 7% joint continuous with tapering 6'", and provided with a strong secondary booth and 2 slender setae. Peraeopod 3, 24 joint expanded below into a lobe. Uropod 3 extremely small, rami much smaller than pedunele, the outer the smaller. Telson enclosed between the lateral parts of the preceding segments; its tip obtusely truncated. Colour bright orange. L. Q 5 mm. Arctie Ocean (Finmark, Nordland), Hardangerfjord Depth 190—280 m. 2. Gen. Trischizostoma Boeck 1853 Guerinia (Sp. un.: @. nicaeensis) (non Robineau-Desvoidy 1830, Diptera!), (Hope in MS.) A. Costa, Deser. 3 Crost. dal Hope, p.3 | 1853 @., A. Costa, Fauna Reg. Napoli, fase. Apr. 1853 p.1 | 1861 Trischizostoma (Sp. un.: T. raschii), A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 637 | 1886 T7., Bovallius in: N. Acta Soc. Upsal., ser.ö v.13 nr.9 p.23 | 1888 T7., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. xıx, ‚272, 1673, etc. | 1890 T., G. O. Sars, Crust. Norway, v.1 p.29 | 1895 T., T. Stebbing in: Nat. Sci., e.6 p.265 | 1893 Guerina + T., A. Della Valle in: F. Fl. Neapel, v.20 p. 775, 779. u Se A 4 an Eh Balz ne u Aa in €“ dh “re, here Pl} PRCHAD,- N Ra, Trischizostoma 13 Back broadly rounded. Rostrum broad, apically rounded (Fig. 3). Side-plate 2 the largest. Eyes very large. Antenna 1 in ©, 1° joint large in both flagella; in 9 1° joint of principal flagellum very large. Antenna 2, ultimate joint of peduncle in © shorter than penultimate, in S thereverse. Mouth- organs in © (Sars): Upper lip long, narrow ; lower lip with lobes acutely lanceolate. Mandible, eutting edge very narrow, sharpened and obliquely truncated; accessory plate inconspicuous; no molar; palp very large and .densely setose. Maxilla 1, inner plate small, unarmed; outer very narrow, apically divided into small, elaw-like teeth (4 strong teeth, Bovallius); palp very minute but distinctly biarticulate. Maxilla 2, both plates very narrow, stiliform. Maxillipeds, inner plates very narrow, unarmed, outer plates linguiform, partly en- compassing the „other oral parts; palp geniculate at the middle, 1° joint short, 4? Janceolate. Mouth- organs in J' (Della Valle): Upper lip long, not narrow, apex not emar-. ginate; lower lip with broad lobes, and a shorter pointed single lobe between them. Mandible narrowly spatulate, without true cutting edges; no molar, 3 spinules; palp very large and setose. Maxilla 1, no inner plate; outer plate elongate, tipped with 5 large teeth; palp reduced to a little tuberele. Maxilla 2, inner plate shorter and narrower than outer, apically pointed, with one setule, outer apically broad, with 2 or 3 little setules. Fig. 3. T. nicaeense. Lateral view. [After G. O. Sars.] - -Maxillipeds, inner plates very narrow, unarmed; outer plates as in ©, palp with 18 joint longer than 24 or 34, 4th Janceolate. Gnathopod 1 enormously developed, subchelate; in the adult of both sexes the hand is so inverted, that the finger seems to be attached to the wrong end of the palm. Uropods - with rami subequal, broadly lanceolate; outer ramus of 34 2-jointed. Telson small, entire. l species. 1. T. nieaeense (A. Costa) 1853 Guerinia nicaeensis, A. Costa, Deser. 3 Crost. dal Hope, p.3 | 1853 @.n., A. Costa, Fauna Reg. Napoli, fase. Apr. 1853 p.2 | 1867 @G.n., A. Costa in: Annuario Mus. Napoli, v.4 p.44 t.3 f.1 | 1888 Trischizostoma n., T. Stebbing in: Rep. Voy. Challenger, v.29 p.272, 1673 | 1861 T. raschü, A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 637 | 1872 T.r., A. Boeck, Skand. Arkt. Amphip., v.1 p.97 t.2 £.1] 1886 T.r., Bovallius in: N. Acta Soc. Upsal., ser.3 v.13 nr. 9 p.24 t.3 f£.41—60 (2), 61-67 (Sjuv.) | 1890 & 95 T. r., G. O.Sars, Crust. Norway, v1 " p.31 t.12 (2); p.673 | 1893 Gwuerina nicaeensis + T.r., A. Della Valle in: F. Fl. Neapel, 0.20 p. 776 t.61 £. 10--22 (5); p. 780. Rostrum in 9 horizontal, in J slightly depressed. Side-plates shallow, 1° small, partly covered by the 24. Eyes almost meeting on the top of the head. Antenna 1, 1° joint large, 24 and 34 short; flagellum in Q 9-jointed; accessory flagellum subequal in length to 1° joint of primary, with 1 long ‚and 2 minute joints; flagellum in J 8-jointed, 1 joint much larger than in O, furnished with rows.of hyaline filaments. Antenna 2 in ©, twice length of antenna 1; flagellum 24-jointed; flagellum in S 60-jointed, twice length of peduncle. Gnathopod 1, 6! joint greatly inflated, rounded triangular, the long palm armed with recurved teeth, those near the prominent prehensile angle stronger and elaw-like; 7% joint strong, eurved at the tip. Gmathopod 2 slender; 14 Trisehizostoma, Aecidostoma 34 joint very long, much more so in C than 9; the 5th longer in Q than J; 6th oval, densely setose; 7" minute, inserted on the middle of distal margin of 6{", Peraeopods 1 and 2, 24 joint a little dilated, seemingly more in C than in 9; 4% joint dilated, especially in peraeopod 2, seemingly less in C than in O0. Peraeopods 3, 4 and 5 rather short, successively longer; 24 joint laminar. Telson rounded, almost as broad as long; apex obtusely truncated in ©, broad, oval in d, with a small emargination in young C (Bovallius’ figure). Colour whitish with light reddish tinge on sides (Sars), white as ivory; the eyes dark brown (Costa and Bovallius). L. © 22—30, S 12—13 mm. North-Sea, Skagerrak, North-Atlantic and Arctic Ocean (South-, West- and North- Norway), depth 190--475 m; Mediterranean. Usually on fishes. 3. Gen. Acidostoma Lillj. 1865 Acidostoma (Sp. un.: A. obesum), W.Lilljeborg in: N. Acta Soc. Upsal., ser.38 v.6 nr.1 p.18, 34 | 1890 A., G. O. Sars, Crust. Norway, v.1 p. 37. Body short, robust. Side-plates large, deep. Antenna 1, 24 and 34 joints short, in S but not in © nearly as stout as the 1°; 1° joint of flagellum small in Q, in J laminar, densely fringed; accessory flagellum in J and 9 nearly as long as primary. Antenna 2 rather slender. Upper lip long, narrow. Lower lip with the lobes narrowed. Mandible with minute tooth at each end of eutting edge, narrow, simple; no molar; palp slender, nearly as long as the trunk, armed only at apex. Maxilla 1, inner plate small, narrow; outer plate narrow, tipped with small unguiform teeth, palp a rudiment. Maxilla 2, both plates stiliform. Maxillipeds, inner plates tapering, outer large without marginal teeth, palp scarcely reaching beyond outer plate, its 4! joint rudi- mentary. Gmnathopod 1 rather robust, 5tk joint subequal in length to 6th, the latter tapering, without palm. Gnathopod 2, 6! joint narrowly oblong, densely hirsute, 7! wanting. Peraeopods 3, 4 and 5 robust, 24 and 4th joints much expanded. Uropod 2 with broad peduncle; uropod 3 very small. Telson short, broad, more or less cleft or emarginate. 2 species. Synopsis of species: Telson rather deeply cleft ..... N le 1. A.obesum. . . p.14 Telson: süghtly emarginate 2... x nres. en 2. A. laticorne . . p.14 1. A. obesum (Bate) 1862 Anonya obesus, Bate, Cat. Amphip. Brit. Mus., p. 74 t.12 £.1 | 1865 Acidostoma obesum, W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.6 nr.1 p.84 t.5 | 1890 A. o., G. O. Sars, Crust. Norway, v.1 p.88 t.14 f.2. Pleon segment 3 with postero-lateral angles narrowly rounded. Eyes small, rounded, brownish. Antenna 1 in oO, flagellum 7-jointed, accessory flagellum 5-jointed, in S 1% joint of flagellum large, flattened, but arched below and armed with sensory filaments. Uropod 3 scarcely half as long as uropod 2, the rami lanceolate, unarmed, the outer one the longer. Telson almost as broad as long, rounded, cleft beyond the middle. Colour pale orange with light red bands across the segments. L. 5 mm. North-Atlantie, North-Sea and Skagerrak (Moray Firth, Shetland Islands, South- and West-Norway, Bohuslän, South-West-England, West-France). Depth, low tide mark to 90 m. 2. A. laticorne O0. Sars 1879 A. laticornis, G. O. Sars in: Arch. Natury. Kristian., v.4 p.440 | 1885 & 86 A. laticorne, G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 152 t.13 f.3,3a (8) | ?1893. A. 1, A. Della Valle in: F. Fl. Neapel, v.20 p- 782, 287,769; t.6 £.12; 1.28 £, 1-21 (2) | 1886 A. obesum (err., non Anonyx obesus Bate 1862 ) + Mi l., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. II p. 43, 44. BE. aaa re u a ln ZZ ar ae 0 a in ul ib nu 10 Due a ie a ul 4 Mi 3 b i 4‘ a a a El a AT HEn ehe aaa en nen ni ln alten nn Ellen maman. u maligne nF A a a Sa aa ie 7 a ae 3 *“ k f Acidostoma, Acontiostoma 15 Differs from A. obesum in the following points. Pleon segment 3, postero-lateral angles slightly projecting, but not acute. No eyes (small eyes, with a little biconvex cornea, Della Valle). Uropod 3 with the rami almost tubereular, scarcely reaching beyond pedunecle of uropod 2. Telson almost quadrate, slightly emarginate distally. Colour whitish (orange-yellow, Della Valle. L. o 11, 5 7°5 mm. Arctie Ocean (Lofoten Isles), depth 800—1200 m; ?Mediterranean, on Cereactis aurantiaca (Chiaje). 4. Gen. Acontiostoma Stebb. 1888 Acontiostoma (Sp. typ.: A. marionis) (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.709 | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p. 785. Body compact (Fig. 4); side-plates large, deep, 1° pair projecting over sides of head. Antenna 1, 24 joint not extremely short, both flagella with few and very short joints, only in J 1* of primary enlarged and fringed with filaments. Upper lip with pointed apex. Lower lip with the lobes ‚narrowed. Mandible long and narrow, without molar, palp slender, much shorter than the trunk. Maxilla 1, inner plate small, narrow, outer plate narrow with serrate spines, palp small, distinet, 1-jointed. Maxilla 2, both platesnarrow. Maxillipeds, the basal part robust, inner plates narrow, apically acute, outer plates apically angular, without marginal teeth, palp geniculate, scarcely reaching beyond outer plate, 1° joint IE short, 24 and 34 long, 4" small. Gnathopod 1 slender, Fe. A. marionis, not subchelate, 5% joint shorter than 6%. Gmnathopod 2 with 6!" and 7% joints forming a feeble chela. Peraeopods 3, 4 and 5 robust, 24 and 4% joints much expanded. Uropod 3 very short, without rami. Telson short, entire or emarginate. 2 species. Synopsis of species: Integument solid, opaque . . 2... 5 een ki A manom.: 288 Integument thin, pellueid .... 0... 2.2 2... 2. A. magellanicum . p.15 1. A. marionis Stebb. 1888 A. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p- 709 t.30 | 1893 A. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 786. Pleon segments 1—3 distally earinate on the back, 4!" with depression followed by elevated carina produced a little backward. Eyes large, oval. Antenna 1, 1° joint as long as rest of antenna, 29 as long: as the 7-jointed flagellum, accessory flagellum 2-jointed. Antenna 2 little longer than antenna 1, ultimate joint of peduncle much shorter than penultimate, a little shorter than the 7-jointed flagellum. Mandible with spine-row of 3 or 4 spinules, and in place of molar a ciliated tract. Maxilla I, palp small, acute, l-jointed. Maxillipeds, inner plates short, 4% joint of palp very short, with small oval spine within the tip. Gmathopod 2, 5!" joint a little longer than 6%, Uropods with many spines. Telson not much. longer than broad, apex rounded, girt with short spines. L. 7°5, height at centre rather over 5 mm. Southern Indian Ocean (Marion Island). Depth 90—-135 m. 2. A. magellanicum Stebb. 1888 A. m., T. Stebbing in: Rep. Voy. Challenger, 2.29 p. 714 t.31. 16 Aecontiostoma, Stomacontion, Hirondellea Pleon segments 1—3 not carinate, 4!" with depression followed by small hump overhanging the following segments. Eyes small. Antenna 1 and 2 nearly as in preceding species; flagellum 4-jointed, accessory flagellum 2-jointed. Antenna 2 rather shorter than antenna 1, flagellum 4-jointed. Mandible with strap-shaped secondary plate on left mandible, spine-row of 6 spinules, and eiliated traet. Maxilla 1, palp small, acute, 1-jointed. Maxillipeds, inner plates short, 4!" joint of palp forming a small but very distinct, straight, tapering finger. Gmathopod 2, 5" joint a little shorter than 6%, Uropods almost entirely devoid of spines. Telson short and broad, emarginate or a little eleft, with.2 spines on each apex. L. 3 mm. Possibility that this may be the young of A. marionis. Entrance to the Strait of Magellan (Cape Virgins). Depth 100 m. 5. Gen. Stomacontion Stebb. 1888 Acontiostoma (part.), T. Stebbing in: ng Voy. Challenger, v.29 p.709 | 1899 Stomacontion (Sp. typ.: Acontiostoma pepinii), T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p.205. Agreeing in general with Acontiostoma © 15), but distinguished by maxilla 1 with palp 2-jointed, maxilliped with 4 joint of palp rudimentary, uropod 3 ending in a tubereular ramus. l species. 1. S. pepinii (Stebb.) 1888 Acontiostoma p. + A. kergueleni, T. Stebbing in: Rep. Voy. Challenger, ©.29 p. 716 t.32 (2 or juv.); p- 720 .33 (3) | 1899 A.p, Stomacontion sp. typ., T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 206. oO or juv. Peraeon broadly rounded, afterpart of pleon compressed. Pleon segment 3 dorsally rounded, rising above the 4tk, which has a deep dorsal excavation, while the end is strongly upturned, with the process rounded behind. Eyes very small. Antennae about as in Acontiostoma, but peduncle of antenna 1 more-robust, flagellum 5-jointed, accessory flagellum 2-jointed. Antenna 2, flagellum 4-jointed. Mandible with 7 spinules and ciliated traet. Maxilla 1, palp minute, 2-jointed. Maxillipeds, inner plates long, 4!" joint of . palp quite rudimentary. Gnathopod 2, 5t" and 6!" joints subequal. Peraeopod 5, _ 22 joint at lower hind corner quadrate, the point a little incised. Uropods 1 and 2, each with subequal rami, uropod 3 with a single tubereular ramus. Telson with small apical noteh accompanied by spines and cilia. L. 2:5—7°5 mm. — d. Pleon segment 3 ending dorsally in a little upturned tip. Eyes large, oval. Antenna 1 distinguished by having 1° joint of 5-jointed flagellum enlarged and fringed with filaments, accessory flagellum 2-jointed. Antenna 2, flagellum 4-jointed. Mandible, with small bifid accessory plate on the left; 2 or 3 spinules seen, but no ciliated tract. Gnathopod 2, 5tk joint longer than 6, Peraeopod 5, 24 joint a little rounded at lower hind corner. Uropods 1 and 2, each with the'rami unequal. Uropod 3 with one tubercular ramus. Telson with apical notch, and’spinules. L. 7°5 mm. Royal Sound [Kerguelen Island]. Depth 50 m. 6. Gen. Hirondellea Chevreux 1889 Hirondellea (Sp. un.: H. trioculata), Chevreux in: Bull. Soc. zool. France, v.14 p.285 | 1893 H., A. Della Valle in: F. Fl. Neapel, v.20 p. 836 | 1898 Hirondella (laps.), J. V. Carus in: Zool. Anz., Regist. 11—15 p. 142. et a ie Hirondellea, Podoprionella 17 % Side-plate 1 narrow. 3 eyes. Mouth-orgaus prominent. Mandible elongate, palp attached behind molar. Maxilla 1 robust, palp broad and 1 long, with teeth few but strong. Maxilla 2, plates broad, outer less so than inner. Maxillipeds, inner plates broad, quadrangular, obliquely truncate, outer plates broad, ovate, not reaching end of 24 joint of palp. Gmathopod 1 subcheläte, gnathopod 2 minutely chelate. Peraeopods slender. Telson deeply emarginate. 1 species. 1. H. trioculata Ühevreux 1889 H.t., Chevreux in: Bull. Soc. zooi. France, v.14 p.285 f. * Body thick, peraeon carinate. Head short, lateral lobes broadly rounded. Side-plates 1—3 narrow, 4!" with smoothly rounded hind lobe. Pleon segment 3 with postero-lateral angles a litile produced and acute, segment 4 with dorsal depression followed by rounded carina. One large oval eye occupying dorsal breadth of the head, two others narrowly erescent-shaped on the lateral lobes. Antenna 1, peduncle short and thick, flagellum with 12 joints, only the 1° long; accessory flagellum with 8 joints, only the 1° long. Antenna 2 not much longer than antenna 1, ultimate joint of peduncle rather shorter than penultimate, flagellum 13-jointed. Gnathopod 1, 6% joint rather longer than 5t", rectangular, palm almost straight, not long. Peraeopods 3—5, expanded 24 joint much longer than broad, largest in 5‘% peraeopod, which is shorter than 4%, Uröpods _ rather long, reaching back equally far. Uropod 2, inner branch a little longer - than outer, with spiniferous contraction above the apex. Telson longer than - peduncle of uropod 3, divided scarcely to the centre, the lobes strongly divergent. Colour bright amber yellow, sometimes tinted with rose, eyes yellow. L. 13 mm. 4 North-Atlantie (Azores). Depth 1236 m. 7. Gen. Podoprionella 0. Sars 1895 Podoprionella (Sp. un.: P. norvegica). 6. O. Sars, Crust. Norway, v.1 p.687. Side-plate 1 short, 4" broadly and squarely expanded behind. Upper lip narrowly rounded. Maudibles, cutting edge smooth, spines rudimentary, . molar wanting, palp attached far back, its 24 joint elongate, 3% short. Maxilla 1, n0 inner plate observed. outer plate with strong teeth, palp normal. Maxilla 2, plates very short. Maxillipeds, inner plates narrow, tapering, outer plates large, both pairs nearly smooth, palp not reaching end of outer plate, 4" joint obsolete. Gnathopod 1 rather strong, chelate, 6'% joint much longer than 5t". Gnathopod 2 minutely chelate. Peraeopods 3—5, expanded 24 joint with hind margin - deeply pectinatee Uropod 1 much longer than uropod 2, which is much - _ Jonger than the small uropod 3. Telson entire, squamiform. .. 1 species. 1. P. norvegica O. Sars 1895 P.n., G. O. Sars, Crust. Norway, v.1 p. 688 t.v. Body compact, peraeon thick; pleon small, segment 3 with small upturned - tooth at hind corners. Eyes rounded oval, with 10 large and strongly refractive - lenses, pigment dark brown. Antenna 1 in Q, 24 and 34 joints not extremely short, flagellum 5-jointed, shorter than peduncle, accessory flagellum 2-jointed. Antenna 2 scarcely as long as antenna 1, ultimate joint of peduncle shorter than - penultimate, flagellum 4-jointed, very short. Gnathopod I, a considerable _ «avity between the acute thumb and the curved finger forming the chela. 4 Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 2 18 Podoprionella, Podoprion Gnathopod 2 long and slender, 6" joint almost linear, exceeding '/, length of the long narrow 5t" joint. Peraeopods 1—5, joints 3—7 slender, 6!" longer than 5t%,. Uropod 1 with subequal rami, outer with 2 indents on outer margin, inner with 1 on each margin. Uropod 2 similar to uropod 1, except in size. Uropod 3, inner ramus scarcely more than half as long as outer. Telson rounded, with small indent on each side of rounded apex. Body pellueid, yellowish, showing a globular dilatation of intestine within hinder part of peraeon. L.3 mm. Trondhjemsfjord. Depth 110—150 m. 8. Gen. Podoprion Chevreux 1891 Podoprion (Sp. un.: P. bolivari), Chevreux in: M&m. Soe. zool.«France, v.4 p-6 | 1893 P., A. Della Valle in: F. Fl. Neapel, 0.20 p. 774. Side-plate 1 much smaller than the following 3. Antenna 1 shorter than antenna 2; both with well developed flagella. Epistome little prominent, upper lip rounded. Lower lip with broad lobes, the mandibular processes turned forward instead of as usual backward. Mandibles broad and short, eutting edge quadri-dentate, accessory plate having 6 or 7 little conical teeth; molar little prominent, very near the extremity of the mandible, furnished with hooked and bearded teeth (perhaps the spine-row, with plumose seta-like spines); palp with 24 joint much the longest. Maxilla 1, inner plate with 6 plumose setae, outer plate with several simple spines, divergent, of different sizes; the 2 joints of palp equal in length, 5 little spines on the apex. Maxilla 2, inner plate the broader with 14 plumose spines, outer plate with 12 simple spines. Maxillipeds, inner plates apically truncate; outer plates broadly oval not quite reaching end of long 24 joint of palp, teeth and spines fringing the inner and distal margins; 4" joint of palp curved, finger-like. Gmathopod 1 chelate, 6% joint much longer than 5, the thumb short, curved, acute, leaving only a small space in the chela formed with it by the short hooked finger. Gnathopod 2 slender, 6t" joint much shorter than 5%, forming a sort of chela with the minute finger, but its produced apex rounded, not ‚acute. Peraeopods 1—5 slender; all elongate, but especially the 4!" and 5th; 6 joint in all longer than 5tk, In peraeopod 3 the expanded 24 joint has the hind margin eut into 6 large teeth; in the following peraeopods it is only slightly dentieulate. Uropod 1 with stiliform equal rami; uropod 2 much shorter, inner ramus the longer; uropod 3 with long lanceolate rami, the outer exceeding the other by a spine-like 29 joint. Telson long, deeply eleft, the apices standing apart, each notched for a spinule. 1 species. 1. P. bolivari Chevreux 1891 P. b., Chevreux in: Möm. Soe. zool. France, v.4 p-6 t.1. Side-plate 4 comparatively narrow, shallowly excavate behind. Pleon segment 3 with corners quadrate, segment 4 with deep dorsal depression. Eyes large, reniform, red. Antenna 1, 1° joint with a distal tooth, 29 and 34 very short; flagellum with 19 joints, 1° long, with brush; aecessory flagellum 5-jointed. Antenna 2 nearly half as long as body; ultimate and penultimate Joints of peduncle subequal; flagellum with 30 short joints. In the telson the outer arm of each notched apex is longer than the inner. Colour pale rose. L. 11 mm. North-Atlantie (Vigo [Spain]). Depth 20 m. Euonyx 19 9. Gen. Euonyx Norm. 1867 Euony& (Sp. un.: E. chelatus), A. M. Norman in: Rep. Brit. Ass., Meet. 36 2.197, 202 | 1888 E., T. Stebbing in: Rep. Voy. Challenger, v.29 p.668 | 1891 E., G. ©. Sars, Crust. Norway, v.1 p.116 | 1898 E., A. Della Valle in: F. Fl. Neapel, v.20 p-841 | 1876 Leptochela (Sp. un.: Opis leptochela) (non Stimpson 1860, Decapoda!), A. Boeck, Skand. Arkt. Amphip., v.2 p. 190. Side-plate 1 small, partly concealed by 24. Mouth-parts differing in the .g species. Mandibles with eutting edge almost simple, molar weak or obsolete, palp central or subcentral. -Maxilla 1, inner plate not large, outer plate broad, obliquely truncate, palp normal. Maxilla 2, inner plate the shorter, obliquely truncate. Maxillipeds, 24 joint of palp reaching beyond the outer plates. Gnathopods 1 and 2 slender, 34 joint elongate; gnathopod 1 chelate, gnatho- pod 2 subchelate. Uropod 3, rami lanceolate, the outer with a small second joint. Telson oblong, deeply cleft. 2 species. Synopsis of species: Gnathopod 1, 5th and 6th joints subequal . *. . .. . .»+.1 E.chelatus . .p.19 Gnathopod 1, 5th joint much shorter than 6th. ..... 2. E. normani . . p.19 1. E. chelatus Norm. 1867 E.c., A. M. Norman in: Rep. Brit. Ass., Meet. 36 p. 197, 202 | 1888 E. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.673 | 1891 E. e., G. ©. Sars, Crust. Norway, v.1 p.117 t.40 £.1| 1893 E.c., A. Della Valle in: F. Fl. Neapel, 0.20 p.842 | 1868 Opis leptochela, Bate & Westwood, Brit. sess. Urust., v.2 p- 501 ! 1876 O.1., Leptochela, A. Boeck, Skand. Arkt. Amphip., v.2 p. 190. Pleon segment 3, postero-lateral angles produced to a short blunt point; segment 4 with dorsal depression followed by high compressed hump. Eyes a constrieted oval, chalky white. Antenna 1 large, 1° joint concave above; flagellum twice length of peduncle, with 10 joints, 1% very large; accessory flagellum 5-jointed. Antenna 2 twice length of antenna 1, ultimate and pen- E - ultimate joints of peduncle equal, flagellum 22-jointed. Mandible with molar obsolete, palp on distal side of centre. Maxilla 1, inner plate with several apical setae. Maxillipeds, outer plates rather small with slender setae on the margin, but no spine-teeth. Gmathopod 1 with few setules, 34 joint longer - than 5th or 6th, 6tk with hind margin straight, the elosely adjacent finger and thumb forming a chela of about '/, length of the hand. Gnathopod 2 ; longer and stronger than gnathopod 1, 6'" joint about '/, length of 5, distally widened, palm concave, 7!" joint strong and curved. Peraeopods 3—5, 2 joint not very large, rounded, 4! much expanded. Uropod 3 with the rami unarmed, the inner reaching 24 joint of outer. Telson without spinules, oblong, cleft much beyond the middle, apices blunt. Colour whitish tinged = with yellow. L. © 10 mm. Arctic Ocean, North-Atlantie and Irish Sea (Finmark, Trondhjemsfjord, Hebrides, Isle of Man). Depth 95—280 m. 2. E.normani Stebb. 1888 E.n., T. Stebbing in: Rep. Voy. Challenger, v. 29 p- 669 t. 19. Pleon segment 3, postero-lateral angles blunt; segment 4 a little raised behind the dorsal depression. Eyes indistinet, narrowly oval. Antenna 1, 1% joint stout, not concave above; flagellum more than twice length of peduncle, with 29 joints, 18: very large; accessory flagellum 9-jointed. Antenna 2, 9% 20 Euonyx, Opisa not much longer than antenna 1, ultimate joint of peduncle shorter than pen- ultimate, flagellum 35-jointed. Mandible with molar distinct but not denticulate, palp central. Maxilla I with 3 plumose setae on inner plate. Maxillipeds, outer plates rather large, but not reaching end of 24 joint of palp, spine-teeth of inner margin minute and numerous. Gnathopod 1 with few setules, 39 joint longer than 5%, much shorter than 6th, 4th and 5fh joints equal, 6" with hind margin concave, the elosely adjacent finger and thumb forming a chela of not more than '/, length of hand. Gmathopod 2 longer, not stronger than gnathopod 1, 6" joint slender, not widening distally, about "/, length of 5tk, the minute 7! joint not curved, but elosely adjusted to the oblique palm. Peraeopods 3—5, 24 joint roundly quadrangular, 4! very moderately expanded. Uropod 3 with many little spines on the short broad rami, of which the inner reaches the 24 joint of the outer. Telson with some marginal spinules, oblong, eleft ?/, length, apices blunt, notched. L. © 15 mm. South-Paeifice (Kermadee Islands). Depth 1140 m. 10. Gen. Opisa Boeck 1842 Opis (Sp. un.: O, eschrichtii) (non Defrance 1825, Mollusca!), Kroyer in: Naturh. Tidsskr., v.4 p.149 | 1876 Opisa (Sp. typ.: Opis typica), A. Boeck, Skand. Arkt. Amphip., e.2 p.190 | 1890 O., G.O.Sars, Crust. Norway, v.1 p.36 | 1893 ©. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 806. Side-plate 1 short, partly concealed by 24, 4! deeply excavate behind. Upper lip rather broadly rounded. Mandible. eutting edge smooth, spine-row feeble, molar obseure, in any case without triturating surface; palp rather far back, 24 joint strongly setiferous. Maxilla 1 normal, 2 setae on narrow inner plate. Maxilla 2, plates setose only apically. Maxillipeds, inner plates normal, outer plates angular at apex, inner margin denticulate, palp normal, rather short. Gnathopod 1 chelate, 5!" joint small, 6!R greatly widened, the thumb acute, not very long, leaving a great cavity between itself and the much eurved finger (7 joint). Gnathopod 2 subchelate. Peraeopods 1--5 not elongate, most of the joints slender, 24 joint in peraeopods 3—5 greatly expanded. Uropod 3 elongate. Telson elongate, deeply cleft. l species. 1. ©. eschrichtii (Kroyer) 1842 Opis e., (Holbell in MS.) Kroyer in: Naturh. Tidsskr., v.4 p. 149 | 1876 Opisa eschrichti, A. Boeck, Skand. Arkt. Ampbip., v.2 p.190|1890 O.e., G. ©. Sars, Crust. Norway, v.1 p.36 t. 14 f.1'1893 O. eschrichtü, A. Della Valle in: F. Fl. Neapel, v.20 p.806 | 1846 Opis typica, Kreyer in: Naturh. Tidsskr., ser.2 v.2 p.46 | 1846 O.t., Kroyer in: Voy. Nord, Crust. t. 17 £.1. Pleon segment 3, postero-lateral angles rounded. Eyes rather large, oblong, pigment dark brown. Antenna 1, 1° joint very large, flagellum 8-jointed, about as long as peduncle, 1° joint very large, especially in J,' accessory flagellum 5-jointed, rather long. Antenna 2 in Q scarcely longer than antenna 1, in J as long as body, with ealceoli. Gmathopod 1, 6% joint nearly globular. Gnathopod 2, 6tk joint about "/, length of 5tk, slightly dilated distally, apex truncate. Peraeopods 3—5, 24 joint large, rounded oval, nearly as long as -rest of limb. Uropod 3, rami much longer than peduncle, outer ramus the longer, with distinet terminal joint. Telson about 3 times longer than broad, cleft nearly to base, 2 pairs of dorsal and 1 of terminal spinules.. Whitish, with dark brown intestine seen through skin. L. 7—8 mm. Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Iceland, Norway); Korea Sea, depth 66 m. E 3 1 Sophrosyne 2 11. Gen. Sophrosyne Stebb. 1888 Sophrosyne (Sp. ün.: S. murrayi), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 652 | 1891 S., T. Stebbing & D. Robertson in: Tr. zool. Soe. London, v. 131 p-81 | 1893 $., A. Della Valle in: F.Fl. Neapel, v.20 p.795 | 1899 Paropisa (Sp. typ.: Opisa hispanc), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 206. Mandible, molar wanting, palp affıxed far forward, 24 and 39 joints subequal. Maxilla 1, inner plate small, with 1 seta, outer plate feebly armed, palp with few spine-teeth. Maxilla 2, inner plate much shorter than outer, neither strongly setose. Maxillipeds slender, inner and outer plates very small, the palp elongate. Gmnathopod 1 robust, 5t" joint triangular, somewhat produced, 6! broadly oblong. produced into a sharp tooth, opposed to the rather powerful finger almost chelately. Gnathopod 2 subchelate. Peraeopods, e. Joint rather elongate. 24 joint broad in peraeopods 3—5. Uropod 3, rami unarmed, the inner very little shorter than the outer. Telson not very elongate, partiaily eleft. 3 species. Synopsis of species: Aare ö, hind margin of 2d joint produced BOWONMAR SE ee 3. 8. hispana . . . p.22 | Peraeopod 5, hind margin of 2d joint not produced downward — 2. i 9 f. Telson cleft: beyond the eenire ... » ... 3-2... 1. 8. murrayi. . . p.21 \ Telson not eleft to the centre . ......... 2. 8. robertsoni. . p.21 1. S. murrayi Stebb. 1888 S. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p- 652 t.15 | 1895 S. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 795 t. 60 f.38. Pleon segment 3, postero-lateral angles acutely upturned, back with a pair of humps and distally squared, segment 4 abruptly narrower. Antenna 1, 1° joint rather elongate, 24 longer than the 1% joint of the 7-jointed flagellum, accessory flagellum 4-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 8-jointed. Maxillipeds, inner plates not quite reaching base of palp. Gmathopod 1, 34, 4th and 5th joints strongly and densely spined along the hind margin, palm of 6!" joint spinulose. Gnathopod 2, 6" joint more than half as long as 5t", distally widened, with concave palm, finger curved. Uropod 3, rami short, the inner a little shorter than the outer. Telson as broad as long, cleft dehiscent, not quite ?/, of the length, apices broadly rounded. L. © about 13 mm. Christmas Harbour [Kerguelen Island]. 2. S. robertsoni Stebb. & D. Roberts. 1891 S. r., T. Stebbing & D. Robertson in: Tr. zool. Soc. London, v.131 p.3l t.5a | 1893 $. r., A. Della Valle in: F. Fl. Neapel, v.20 p. 795. Pleon segment 3, postero-lateral angles acutely upturned, back arched, not distally squared, segment 4 with 3 little dorsal humps. Antenna 1, 18t joint rather tumid, 24 longer than the short 1° joint of the 6-jointed flagellum, accessory flagellum 3-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 8-jointed. Maxillipeds, inner plates not nearly reaching base of palp. Gnathopod 1 as in S. murrayi, but more feebly armed. Gnathopod 2, 6% joint narrow just at the base, but thence of uniform 22 Sophrosyne, Valettia width, palm very small, convex. Uropod 3, rami scarcely showing any difference in length. Telson longer than broad, cleft dehiscent, not quite reaching the middle, apices broad, slightly indented. L. 90 6 mm. Firth of Clyde [Scotland]. 3. S. hispana (Chevreux) 1887 Opis h., Chevreux in: Bull. Soe, zool. France, v.12 p.567 | 1888 Opisa h., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1641 | 1893 O.h., A. Della Valle in: F. Fl. Neapel, v.20 p. 807 I 1899 O. h., Paropisa sp. typ., 3 Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 206. Head, lateral angle little prolonged, rounded. Side-plate 1 broader and deeper than the 2 following. Pleon segment 3, postero-lateral corners slightly produced backward, quadrate, 4" slightly gibbous. Eyes wanting. Antenna 1, flagellum 4-jointed, with long setae, accessory flagellum 2-jointed. Antenna 2, penultimate joint rather longer than ultimate of peduncle. Gnatho- pods 1 and 2 apparently as in S. robertsoni. Peraeopod 5, 24 joint widely expanded behind and produced downward to middle of 4%, its margin dentate. Uropod 3, rami smooth, a little longer than pedunele. Telson as broad as long, eleft to the centre. L. 2 mm. North-Atlantie (Cape Finisterre). Depth 510 m. 12. Gen. Valettia Stebb. 1888 Valettia (Sp. un.: V. coheres), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 723 | 1893 V., A. Della Valle in: F. Fl. Neapel, v.20 p. 772. None of the side-plates especially large. Mandible broad and short, the cutting edge strongly dentate, secondary plate on left mandible also strongly dentate, molar denticulate, palp central. Maxillipeds, inner plates with more than 3 apical teeth, outer plates at apex acutely produced, inner margin without teeth, 1° joint of palp not shorter than 24. Gnathopods 1 and 2 subchelate, the 24 little weaker than the 1° and of similar structure except in having the 34 joint elongate. Peraeopods 3—5, with the 24 joint so little expanded, that these limbs are not imbricated as usual, but stand apart. Uropods successively shorter, rami of each pair unequal. Telson short, broad, cleft beyond the middle. l species. 1. V. eoheres Stebb. 1888 V.c., T. Stebbing in: Rep. Voy. Challenger, v.29 P. 724 t. 34. Side-plate 4 little excavate behind. Pleon segment 3, angles acute, a little upturned, 4" with dorsal depression followed by small distal hump. Eyes not observed. Antenna 1, pedunele short, stout, 1° joint scarcely longer than broad, flagellum with 13 or 14 joints, 1° subequal in length to peduncle, accessory flagellum with 1 long and 3 short joints. Antenna 2 subequal in length to antenna 1, ultimate joint of peduncle shorter than penultimate, flagellum 14-jointed. Maxilla 1, inner plate with 5 short plumose setae, outer with 8 or 9 slender spines, 24 joint of palp long, with 6 spine-teeth. Maxilla 2, with about 12 spines on each plate. Gnathopod 1, 34 and 4 joints short, 5t® shorter than 6%, which is oblong, not 1'/, times as long as broad, palm rather deeply concave, 7*k joint curved, not massive, impinging on palmar spines. Gnatho- pod 2 similar to gnathopod 1, but 34 joint longer than 4%, and 5'% longer than 6%, which has the palm not concave, but sloping inwards, a little % DEE EI AT PEODD) N Be UNE aA T 5‘ FERN NET BE ee tee: Valettia, Amaryllis 23 crenate. Peraeopods 1 and 2, 4 joint broader and much longer than 5%, Peraeopod 3, 24 joint a narrow oval. Peraeopod 4, 24 joint rather larger than in peraeopod 3. Peraeopod 5, 24 joint expanded above, narrowing below. Uropod 3, rami short, broad, the outer the longer by a minute 24 joint. Telson with rounded apices. L. 12:5 mm. Antarctie Ocean (lat. 62° 26° S.) Depth 3612 m. 13. Gen. Amaryllis Hasw. 1880 Amaryllis, Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.253 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.698 | 1895 A., A. Della Valle in: F. Fi. Neapel, v.20 p. 781. Head very deep. Peraeon segment 1 shallow, segments successively deeper to 24 of pleon. Side-plate 1 very small, 4% abruptly larger than those preceding it. Antenna 1 (Fig. 5), 1% joint not very stout, 24 and 34 not very short. Mandible, cutting edge simple, secondary plate of left mandible denticulate, spine-row with many short spines, molar feeble, ciliated, not dentieulate, palp behind centre of trunk. Maxilla 1, inner plate with 2 plumose setae, palp wanting. Maxillipeds, inner and outer plates large, outer without spine-teeth, "4 joint of palp small, obtuse, without a nail. Gnathopod 1 simple. Gnathopod 2 subchelate. Telson cleft. 3 species accepted, 1 doubtful. Synopsis of accepted species: | Antenna 1, 2d joint much longer than 3d . . 1. A.haswelli ..... p- 23 1 ! Antenna 1, 2d joint not much longer than | 3d — 2. j Peraeopod 3, 2d joint expanded above. . . . 2. A. macrophthalma. . p.24 \ Peraeopod 3, 2d joint not expanded above. . 3. A. bathycephala. . . p.24 E 1. A. haswelli Stebb. 1888 A.A., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 703 t.28 | 1893 A. h., A. Della ‚Valle in: F. Fl. Neapel, v.20 p. 781. Pleon segment 3,- with the angles acute, not upturned, the hind margin bulging above them. Eyes not distinetly observed. Antenna 1 (Fig. 5), 1° joint vn elongate, and ending in a tooth '/, length of 24 joint; 24 thrice length of 3; flagellum with 24 joints, 15 shorter than last of peduncle; accessory flagellum 4-jointed. An- Yale — tenna 2 subequal to antenna 1, ultimate joint of pedunele about '/, length of penultimate, flagellum 22-jointed. Maxilla 1, outer plate carrying 11 spines. Gnathopod 1, 24 joint as long as the 4 following combined and Yan much wider than any, 3% as long as 4", 5th Jonger ” than the long tapering 6%, which has the hind margin pectinate; there are many spines and setae on these joints; 7 joint small, eurved. Gnathopod 2, 24 joint not as long as 5tk and 6" combined, 34 longer than 4th, 5th nearly twice as long as 6tk, both slender, densely furred; 7th joint small, much curved, over- arching the narrow palmar margin. Peraeopods 1 and 2 slender. Peraeopod 3, side-plate much wider than N EEE 24 joint, with hind lobe the longer, 4% joint longer a Flagellum — Dir a SUR le ie En ee I u en > u. 1 4 4 P} r u >, v = Pi a a ae u a Er Tas En 6 ELSE urste Snahnsll 3a 32 2 au a a 1 Gala Ua ann al a la a ae and ln a er ee Te a ie an En ö R EEE EEE N N SEE ET NEROHFRTTN ee ' ATTEREN: a SS Bi na ee Kahn BB: Y . » . 3 u y " baden Be TE + F Be a un 24 Amaryllis and much broader than 5", Peraeopod 4, 24 joint oblong, with rounded lower hind corner. Peraeopod 5, 24 joint larger than in preceding limb, lower hind corner quadrate. Uropod 2 with rami unequal, the longer having a constrietion. Uropod 3 with stiliform subequal rami longer than the peduncle. Telson shorter than pedunele of uropod 3, celeft a little beyond centre, narrowing to the divergent apices. L. © about 11 mm. North-Atlantie (Azores). Depth 1829 m. 2. A. macrophthalma Hasw. 1880 4A. macrophthalmus + A. brevicornis, Haswell in: P. Linn. Soe. N.S.Wales, v.4 p.253 t.8 f.3; p.254 | 1888 A. m., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 707 t. 29 | 1893 y m. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.781. Pleon segment 3, postero-lateral eorners squarely upturned, forming a little pocket above the point, but in the small Patagonian specimen acute, not upturned. ‚Eyes vertically elongated, suberescentic. Antenna 1, 3 joints of peduncle not very elongate, 24 and 34 nearly equal, flagella variable, primary with 17, 30, 18, 5 joints in different speeimens, accessory flagellum with 13, 7,5, 2 joints, respectively. Antenna 2, ultimate joint of peduncle shorter than penultimate. Gnathopod 1, 3% joint longer than 4, 5th joint shorter than the tapering strongly pectinate 6th, 7th joint short, slightly curved. Gnathopod 2 not extremely slender, 5t joint only a little longer than 6", which is elongate, of uniform width, 7 joint small, rather stout at the base. Peraeopods 3, 4 and 5, 24 joint roundly expanded, 4" joint broad, not elongate. Uropod 2 with rami unequal, the longer constrieted. Telson reaching a little beyond peduncele of uropod 3, eleft .a little beyond the middle, apices broad, not divergent. L. about 6—20 mm. South-Pacifie (Tasmania; Port Jackson [East- Amen) sublitoral); Strait of Magellan (Cape Virgins, depth 100 m). 3. A. bathycephala Stebb. 1888 A. bathycephalus, T. Stebbing in: Rep. Voy. Challenger, v.29 p.699 t.27 | 1893 A. macrophthalmus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 781. Side-plates 4 distinguished from those of 2 preceding species by being broader than deep and having the backward prolongation much more rounded. Pleon segment 3, postero-lateral eorners squarely wpturned, forming a little pocket above the point. Eyes large, inversely flask-shaped. Antenna 1, 1° joint rather long, 24 longer than 34, flagellum with 10 or 11 joints, 18t not longer than 24, aecessory flagellum 3-jointed. Antenna 2, ultimate joint of peduncle a little shorter than penultimate, flagellumı 9-jointed. Gnathopod 1 as in the preceding species. Gnathopod 2, 5% joint decidedly longer than 6t", 6 Jong, dilating towards the oblique palm, 7% joint small, eurved, not reaching end of palm. Peraeopod 3, hind lobe of side-plate more produced downwards than in A. macrophthalma, 24 joint pear-shaped, narrow above, with a rounded decurrent lobe below. Peraeopods 4 and 5, 24 joint broadly oval, 4" joint as in peraeo- pod 3 moderately expanded. Uropod 2, rami unequal, the longer constricted. Telson not nearly reaching end of peduncle of uropod 3, cleft scarcely beyond centre, apices rounded, scarcely divergent. L. about 6 mm. - Port Phillip [Melbourne]. Depth 60m. A. pulchella Bonnier 1896 4A. pulchellus, J. Bonnier in: Ann. Univ. Lyon, v.26 p. 624 t.36 £.3. Probably identical with A. haswelli (p. 23). Gnathopod 1, 5th joint shorter than 6th (equal in fig... Gnathopod 2, 5th joint not very much longer than 6th and rather narrower. L. 2 11 mm. Bay of Biscay. Depth 950 m. Fol ee TS er Eee a a Eee ee ae 3, h sa de SE AN Mr ü a ng ar he a a An al: rl a u a a 2 Zu u ee #5 LER, 4 . ul a 2 ae er Ha Be SE a Beat Pak N Dre BE ee AEn ee A HT Fer Te , 25 14. Gen. Onisimus Boeck 1871 Onisimus (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.111 | 1894 O., T.Stebbing in: Bijdr. Dierk., v.17 p.10 | 1872 & 76 Onesimus (part.), A. Boeck, Skand. Arkt. Amphip., v.1 t.4—6; v.2 p.161 | 1891 O., G. O. Sars, Crust. Norway, v.l p. 104 | 1893 O., J. Bonnier in: Bull. sei. France Belgique, v.24 p.174 | 1893 Pseudalibrotus (Sp. un.: P. littoralis) (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 798. Body rather robust. Side-plates of moderate size, pleon segment 3 with postero-lateral corners distinetly produced. Antenna 1, peduncle stout, 24 and 3% joints very short, both antennae in G longer than in 9 and provided with distinet calceoli. Epistome very slightly prominent, defined from upper lip by a distinct sinus. Mandible, molar rather strong, palp not large, set well forward. Maxilla 1, inner plate with 2 setae, outer broad, obliquely truneate, with Li spines, several (5—8) spine-teeth on palp. Maxilla 2, outer plate broader and much longer than inner. Maxillipeds normal, outer plates erenulate, carrying on rounded apex 1—3 spines, not reaching beyond 24 joint of slender, rather elongate palp. Gmnathopod 1 subchelate, not very robust, 6% joint narrowly oblong, little or not at all longer than 5th, Gnathopod 2, 6* joint uniformly narrow or distally widened. Peraeopods 3—5 rather short and robust. Uropod 3 short, outer ramus with small 24 joint, and sometimes setiferous. Telson short and broad, never deeply incised, sometimes entire, 8 species. Synopsis of species: 1 | Eyes large; telson ineised — 2. Eyes small; telson not ineised — 5. 9 | Gnathopod 1, 6th joint longer than 5th. . . 1. O.edwardsü. . . . - p- 25 \ Gnathopod 1, 6th joint subequal to 5th — 8. | Peraeopods 3—5, 4th joint very robust . . . 2. O.plautus. .....p.2%6 Peraeopods 3—5, 4th joint not very robust — 4. Pleon segment 1, antero-lateral angles unceinate 3. O.normani ..... p. 26 4 | Pleon segment ], antero-lateral angles not BROTEBO 2: 04, DS TUEMAUE: 72,2. p. 26 Telson apically truncate . . . .. 2.2... 5. O. breviecaudatus . . p.27 Telson apically indented — 6. l Gnathopod 2, palm widened, emarginate. . . 6. O.carieus . . . . . .p.27 6 ' Gnathopod 2, palm not widened, nor emargi- \ nate — 7. 7 | N RER ER 1. a leueopis er. p- 28 RE RR Re, N ER p- 28 1. O. edwardsii (Kroyer) 1846 Anonyx e., Kreyer in: Naturh. Tidsskr., ser. 2 v.2 p.1,41'| 1846 A.e., Kroyer in: Voy. Nord, Crust. t.16 f.1 | 1893: A. e. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 828 | 1871 Onisimus e., A. Boeck in: Forh. Selsk. Christian., 1870 p.113 | 1894 O.e., T. Stebbing in: Bijdr. Dierk., v.17 p.10 | 1872 & 76 Onesimus e., A. Boeck, Skand. Arkt. Amphip., v1 t.6 f.4; «2 p. 167 | 1891 O. e., G. ©. Sars, Crust. Norway, o.1 p. 105 t. 36 £.1. Head, lateral angles but slightly projecting, evenly rounded. Side-plate 1 rather expanded below, 4!" with hinder expansion short, obtusely truncated. Pleon segment 3, postero-lateral angles produced to a narrow slightly upturned lobe. Eyes rather large, oblong oval, slightly expanding below, bright red. 26 Önisimus Antenna 1 in 9 ‚flagellum with 15 joints, 1° equalto 24 and 3X combined, accessory flagellum 6-jointed. Antenna 2 a little longer than antenna 1, flagellum 18-jointed. Gnathopod 1, 6% joint much longer than 5%, distally a little curved, palm not very oblique, somewhat arcuate, finely denticulate. Gnatho- pod 2 very slender, 6% joint more than twice as long as broad, more than half as long as 54, scarcely dilated distally, palm and finger minute. Peraeopods 3—5, 4 joint moderately robust, 24 of 5th pair large, as long as rest of limb. Uropod 3 with 2 spinules on inner margin of inner ramus. Telson rounded, scearcely longer than broad, incision very short, apices broad. "Colour pale reddish yellow, eggs in pouch bright orange. L. 11—14 mm. Arctic Ocean; North-Atlantie and North-Sea (West-Norway). Depth 15—94 m. 2. O. plautus (Kreyer) 1845 Anonyx p., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.629 | 1846 A.p., Kroyer in: Naturh. Tidsskr., ser.2 0.2 p.39 | 1846 A. 2 (part.), Kroyer in: Voy. Nord. Crust. t.15 f.2 | 1893 4A.p. (part. .), A. Della Valle in: F. Fl. Neapel, v.20 p. 828 | 1866 Lysianassa plauta, Go&s in: Öfv. Ak. Förh., v.22 p.521| 1871 Onisimus plautus, A. Boeck in: Forh. Selsk. Christian., 1870 p.112 | 1894 O.p., T. Stebbing in: Bijdr. Dierk., e.17 p.10 | 1872 & 76 Onesimus p., A. Boeck, Skand. Arkt. Amphip., v.1t.4 f.2; 0.2 p.164 | 1891 O. p., G. ©. Sars, Crust. Norway, v.1 p. 107 t.37 £.1. ‘Head, lateral angles acute. Side-plate 1 narrow, scarcely expanded below, 4% with hinder expansion obtuse, very slight. Pleon segment 3, postero-lateral angles with upturned point. Eyes much wider below than above, lärger in Ö than in O, red. Antenna 1 in 9, flagellum with 11 joints, 15 equal to next 3 combined, accessory flagellum 4-jointed. Antenna 2 a little longer than antenna 1, flagellum 13-jointed. Both antennae in JS considerably longer than in O, flagella slender, with more joints. Gnathopod 1, 6! joint subequal to 5{t, palm nearly transverse but with corner rounded off. Gnathopod 2, 6th joint more than half as long as 5tk, a little dilated distally. Peraeopods 3—5, 4 joint very robust, 24 of peraeopod 5 much‘ longer than rest of limb. Uropod 3 with no spinules on either ramus. Telson. rounded oval, ineised for "/, of length, apices rather narrow, ee Colour reddish yellow to light brown. L.8 mm. Aretie Ocean; North-Atlantie and North-Sea (West-Norway); Skagerrak (Bohuslän). 3. O. normani (O.Sars) 1891 & 95 Onesimus n., (Schneider in MS.) G.O. Sars, Crust. Norway, v.1 p. 106 t.36 f.2; p.686 | 1893 Anonyx n., A. Della Valle in: F. Fl. Neapel, v.20 p. 827. Head, lateral angles acute. Side-plate 1 scarcely expanded below, 4'!h with hinder expansion short and blunt. Pleon segment 1, antero-lateral angles sharply uncinate, segment 3 with postero-lateral angles acutely uncinate. Eyes oblong oval, red. Antennae 1 and 2 in O short and stout; antenna 1, flagellum with 8 joints, the 1° large, accessory flagellum 3-jointed. Antenna 2, flagellum 8-jointed. Gnathopod 1, 6th joint scarcely or not longer than 5th, palm not curved, very oblique and spinulose, angle indistinet. Gnathopod 2, 6‘ joint half length of 5t%, scarcely widening distally. Peraeopods 3—5, 4th joint not robust, 24 of peraeopod 5 as long as rest of limb. Uropod 2, inner ramus constrieted. Uropod 3, rami without spinules. Telson a little longer than broad, ineised for rather more than '/, of the length, apices moderately broad, indented. Colour pure white, eggs in pouch reddish. L. 9 mm. Arctie Ocean (Tromsö, Finmark), Christianiafjord. 4. O.turgidus (O.Sars) 1879 Anonyx (O.)t., G.O.Sars in: Arch. Naturv. Kristian., v.4 p.437 | 1885 O.£., G. O. Sars in: Norske Nordhavs-Exp., ©.6 Crust. 1 p. 147 t. 12 f.5, 5a-i | 1893 Ahonyz plautus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 828. ’ m u aan zul a m alle BE id nl al a ui udn 2 un 2 02 ul An zus last Bere 1 are ge Al ne and nel seh ner : an Nö en AD na En 2i rn Say) D muen + mt Y gs ? Mn VeRBEER h m at ie 2 Bl al un nn um a ni a il ln en i AHE ana u = Onisimus 27 Body unusually tumid. Head, lateral angles acute. Side-plate 1 little ‚expanded below, 4!h forming an almost recetangular eorner below the hinder emargination. Pleon segment 3, postero-lateral angles acutely uncinate. Eyes oval, the broad end below, rich vermilion in life. Antenna 1, peduncle ‚tumid, flagellum with 10 joints, 1° very large, accessory flagellum with 4 joints, 1% Jarge. Antenna 2, flagellum 7-jointed. Gnathopod 1 rather stout, 6!" joint very little longer than 5, palm rather oblique. Gnathopod 2, 6! joint (as figured) much more than half as long as 5", with a very small excavate palm. Peraeopods 3—5, 24 joint large, hind margin distinetly serrate, 4 joint only moderately broad. Uropod 3 without spinules. Telson short and broad, ineised ?/, of the length, apices broad. Colour whitish, faintly tinged with red. L. reaching 15 mm. Aretic Ocean (midway between Jan Mayen and Finmark). Depth 3220—3310 m. 5. O. brevicaudatus H. J. Hansen 1886 O.b., H. J. Hansen in: Dijmphna Udb., p.216 t.21 f.7—7e | 1894 O.b. (part.), T. Stebbing in: Bijdr. Dierk., «17 p.12| 1893 Pseudalibrotus littoralis (err., non Anonyx Il. Kreyer 1845!) (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 799. Head, lateral angles narrowly rounded. Side-plate 1 somewhat expanded below, 4 with a rather small expansion. Pleon segment 3, postero-lateral angles acutely upturned. Eyes on the projecting lobes of the head, narrowed above, almost triangular, not approaching summit of head. Antenna 1,flagellum in © with 11 joints, in S with 17, 1% large, accessory flagellum with 5 joints, 1st long. Antenna 2, flagellum in © 15-, in C 24-jointed. Both antennae have calceoli in d. Gnathopod 1, 6" joint longer than 5t, palm oblique, finger pro- jeeting a little beyond it. Gnathopod 2, 6! joint in S with margins subparallel, hinder longer than front, finger fixed in middle of apical margin and celosing down on oblique palm; in © with margins diverging distally, hinder shorter than front, finger fixed near front angle and when closed leaving a gap between its eoncave margin and the excavate palm. Peraeopods 3—5, 4% joint moderately broad. Uropod 3 with spinules on the rami. Telson with breadth and length subequal, distal margin straight or faintly rounded or faintly emarginate. L. © 16:5, © 15°5 mm. Kara Sea (lat. 71° 13’N.). Depth 110 m. 6. ©. caricus H. J. Hansen 1886 O. c., H. J. Hansen in: Dijmphna Udb., p-214 t.21 f.6| 1894 O.c., T. Stebbing in: Bijdr. Dierk., v.17 p. 11 | 1893 Anonyx edwardsii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 828. Head, lateral angles slightly projecting, broadly rounded. Side-plate 1 considerably expanded below, 4!" with hinder expansion rather short, obtusely truneated. Pleon segment 3, postero-lateral angles produced upwards into a short blunt point. Eyes on the projecting lobes of the head, narrowed above, almost triangular, not approaching summit of head. Antenna 1, flagellum inO with 16 joints, 1° equal to 2 or 3 next combined, accessory flagellum 4-jointed; flagellum in JS with 30 joints, 1° joint equal to 4 or 5 next combined, accessory flagelluın with 5 joints, 1% elongate. Antenna 2, flagellum in O 20-, in S 37-jointed. Maxillipeds with 3 spines on apical margin of outer plates, where other species appear to have only one. Gmnathopod 1, 6tk joint longer than 5th, palm oblique, spinules fringing it and part of the hind margin. Gnatho- pod 2, 6th joint in both sexes rather more than half as long as 5, sub- triangular, expanding distally, front margin rather the longer, finger stout, leaving an interval between its concave margin and the excavate palm. 28 ÖOnisimus, Cyphocaris Peraeopods 3—5, 4! joint moderately broad. Uropod 3 with spinules on both rami and setae on outer of ©. Telson scarcely longer than broad, distally somewhat narrowed, with a minute indent on each side of the shallow central emargination. L. @ 29, d 265 mm. Arctie Ocean. Depth 94—143 m. 7. O. leucopis (©. Sars) 1879 Anonyxe (O.) l., G.O.Sars in: Arch. Naturv. Kristian., v.4 p.438 | 1885 O.1., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.149 t.13 fl, 1a | 1882 Onesimus I, Hoek in: Niederl. Arch. Zool., suppl.1 nr.7 p.45 | 1893 Anonyx edwardsii (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 828. Head, lateral angles somewhat produced and pointed. Side-plate 1 considerably expanded below, 4% scarcely at all. Pleon segment 3, postero- lateral angles acute, very slightly produced, not upturned. Eyes very small, imperfect, placed near lateral lobes of head, colour light, well-nigh lacteal. Antenna 1, flagellum with 11 joints, 1°! rather large, accessory flagellum long, 4-jointed. Antenna 2, flagellum rather long, 16-jointed. Mouth-organs undescribed. Gnathopods 1 and 2, supposed to resemble those of O. turgidus (p. 26). Peraeopods 3—5, 4" joint rather short and thick. Uropod 3 without spinules. Telson short and broad, with central emargination. Colour whitish, semi-translucent. 1]. 10 mm. North-Atlantie (between Iceland and Norway). Depth 1520 m. 8. O. affinis H. J. Hansen 1886 O..a., H. J. Hansen in: Dijmphna Udb,, p- 216 t.21 £.9, 9a | ?1894 O. brevicaudatus (part.), T. Stebbing in: Bijdr. Dierk., v. 17 p.13 | 1893 Pseudalibrotus littoralis (err., non Anony«x I. Kreyer 1845!) (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 799. Head, lateral angles slightly projecting, rounded. Side-plate 1 rather expanded below, 4" with hinder expansion short, obtusely truncated. Pleon segment 3, postero-lateral angles produced to an upturned rather blunt process. Eyes short, somewhat triangular asin O. earicus (p.27). Antennae, gnatho- pod 1, peraeopods much as in O. edwardsii (p. 25). Gnathopod 2 almost as in OÖ. brevicaudatus J, 6!" joint broader than in O. edwardsii, not twice as long as broad, hind margin rather longer than front, a minute cavity between slightly outdrawn palm and the finger. Telson very little longer than broad, narrowing a little from base to apex, the latter subtruncate, in the middle a little emarginate with an indent on each side. Specimen not adult. L. 13°5 mm. Kara Sea. Depth 54 m. 15. Gen. Cyphocaris Boeck 1871 Cyphocaris (Sp. un.: ©. anony«&), (Lütken in MS.) A. Boeck in: Forh. Selsk. Christian., 1870 p. 103 | 1872 C., A. Boeck, Skand. Arkt. Amphip., v.1 p.140 | 1888 O., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 656 | 1893 C., J. Bonnier in: Bull. sei. France Belgique, v.24 p.174 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p. 846. Head direeted downward beneath the large segment 1 of peraeon (Fig. 6). Side-plates 1, 2 and 3 very small, 4 and 5 large. Pleon segments large. Eyes none or unknown. Epistome not projecting in front of upper lip. Mandible, molar Fig. 6. C. challengeri. F x : Latatal view. prominent, denticulate, palp affıxed above it, large, rg be a 7 te Ball nn ı = = > a na ud 2 alt ul RR ’ Bag ee Em rn le u u ll lau ul 2nn un LIT 2 aan: FE CE NV UELIERN; Nr Bl a la nnd di a cn 2% er IR SER ai in 2 Koll ik rn FE Ti Se sl il a a ae en Mare Aue E 2 aan a a a ae hi an u in u urn Da ” wit A ar er Le 2 ER EEN" Ha S a Re Cyphocaris 29 with joints 2 and 3 subequal. Maxilla 1, inner plate with 7 setae, outer plate with 11 spines, palp with 6 spine-teeth. Maxilla 2, inner plate broader than outer, nearlv as long, with setae on inner margin. Maxillipeds, inner plates not very long, with 3 apical spine-teeth, outer plates not large, fringed with spine- teeth, palp elongate. Gnathopod 1, feebly subchelate, 24 joint longer than rest of limb. Gnathopod 2 elongate. Peraeopods 3—5, 24 joint deeply serrate on hind margin. Uropod 3, rami subequal, long, lanceolate. Telson long, tapering, deeply cleft. 2 species. Synopsis of speeies: Peraeopod 3, 2d joint produced into a long spur. . . . . 1. C. challengeri . p.29 . Peraeopod 3, 2d joint not produced into a long spur. . . 2. C.anonyx . . . p.29 1. C. challengeri Stebb. 1888 C.c., T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 661 t.17 | 1893 ©. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 847. Top of head faeing forward, its proper front margin a little sinuous. Peraeon segment 1 as long as 39 and 4! combined. Side-plate 4 concealing the 34, with long irregularly bowed front and deeply excavate hind margin, 5th much broader than deep. Pleon segment 3, postero-lateral angles squared, minutely produced. Antenna 1, 1° joint equal to 24 and 3% combined, flagellum with 15 joints, 1° as long as 1° of peduncle, accessory flagellum 3-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 40-jointed. Gnathopod 1, 6!" joint a little narrower and longer than 5th, narrowing distally, hind margin minutely pectinate, finger denticulate and toothed on inner margin. Gmnathopod 2, 5 and #'" joints longer than in gnathopod 1, 6% shorter than 5'%, palm small, well defined, finger curved. Peraeopods slender, except in 24 joint of peraeopods 3-5. Peraeopod 3, 24 joint, front margin strongly bent, hinder cut into 7 teeth and prolonged sharply almost to end of 6'"%. Peraeopod 4, 24 joint almost triangular, with 14 teeth, much overlapping 34 joint. Peraeopod 5, 24 joint more oval, with 13 teeth, a little overlapping 34 joint. Uropod 3, rami long, almost equal, sliehtly armed. Telson cleft for ”'/, of the length, without lateral, but with a pair of apical spinules. L. about 7 mm. North-Paeifie (north of Sandwich Islands). 2. C. anonyx Boeck 1871 C.a., (Lütken in MS.) A. Boeck in: Forh. Selsk. Ohristian., 1870 p.104 |! 1872 C. a., A. Boeck, Skand. Arkt. Amphip., v.1 p.141 t.6 f£.1 | 1887 C. a, H. J. Hansen in: Vid. Meddel., ser.4 v».9 p.67 | 1888 (©. mieronyx, T. Stebbing in: Bep. Voy. Challenger, 0.29 p.#: 56 t. 16. Head partly concealed in overarching, rather sharply ee long 1°° peraeon segment. Side-plate 4 more angular than in Ü. challengeri. Pleon segment 28, postero-lateral angles almost quadrate. Antenna 1, 1% joint longer than 24 and 3% combined, flagellum with 21—30 joints, 1° very long, accessory flagellum 5-jointed. Antenna 2, ultimate joint of ‚pedunele shorter than penultimate, flagellum 75-jointed. Gnathopod 1 nearly as in C. challengeri, 6 joint not longer than 5th, Gnathopod 2, 6 joint oval, shorter than 5th, both armed on hind margin with graduated sets of pectinate spines and long broad-ended setae, finger minute. Peraeopods 1 and 2 subchelate, the 6% joint being distally widened and having a palm margin set with teeth and spines, finger powerful, curved, acute. Peraeopod 3, 24 joint with front margin bent, hind margin cut into about 8 teeth, prolonged to end 30 Cyphocaris, Cyclocaris of 5th joint, inner margin of process eut into about 7 teeth, end of limb- as in peraeopods 1 and 2. Peraeopod 4, 24 joint little produced behind, the hind margin divided into 11 teeth, joints 4, 5 and 6 longer than in peraeopod 3, palm narrower. Peraeopod 5, 24 joint with hind margin cut into 14 teeth, 5th and 6th joints very elongate, no palm margin, finger nearly straight. Uropod 3, outer ramus with small 24 joint, inner not shorter than outer, both with plumose setae. Telson long, narrow. «left nearly ®/, of length, with 2 or 3 pairs of lateral spinules, and an apical pair. L. 14 mm. South-Paeifie (west of South America, depth 2700 m); South-Atlantie (Tristan da Cunha, depth 2565 m); North-Atlantie (Cape Farewell, depth 540 m). 16. Gen. Cyclocaris Stebb. 1888 Cyelocaris, T. Stebbing in: Rep. Voy. Challenger, v.29 p.664 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p. 843. Head deep. Side-plates 1 and 2 very small, 39 and 4th large. Antenna 1, peduncle very short. Mandible, eutting edge broad, simple accessory plate minute, molar weak or wanting, palp central (Fig. 7). Maxilla 1 with several plumose setae on inner plate, 11 spines on broad apex of outer plate, 24 joint of palp long, quinque-dentate. Maxilla 2, inner plate much shorter than outer, inner margin setose. Maxilli- peds, inner plates with wide concave distal margin, outer plates broad and long, fringed with setae, spines and teeth. Gnathopod 1 simple, 3% joint much longer than 4'h, 5th longer and slightly wider than the long narrow tapering 6%, 7th slender, Gnathopod 2 slender, 5t" joint much longer than 6%, which is also long and narrow, not tapering; 7b joint small, thick at base, closing over short palm. Peraeopods 1 and 2 not very slender, side-plate of peraeo- pod 1 distally dilated, that of peraeopod 2 very. little Fig.7. C.tahitensis. excavate behind, 4% joint in each rather large. Peraeo- Maaßible. -pods 3—5 pretty strongly spined, 24 joint broadly expanded, 4th very moderately. Uropod 2 with rami unequal, uropod 3 reaching far beyond uropod 2, the outer ramus the longer, with a small 24 joint. Telson long, narrow, tapering, cleft nearly- to the base, a spiniferous notch at each apex with the inner point the longer. 2 species. Synopsis of species: Side-plate 1 distally narrowed . . ... 2... 20% R C. tahitensis . . p.30 Side-plate 1 not distally narrowed . . . .....2.... C. guilelmi . . p.3l 1. C. tahitensis Stebb. 1888 C. t., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 664 t. 18. Side-plate 1 distally narrowed. Pleon segment 3 with blunt angles. Eyes uncertain. Antenna 1, peduncle tumid, 24 and 34 joints very short; flagellum with 10.joints, 1° stout, as long as peduncle or as rest of flagellum; accessory flagellum with 6 joints, 1° long. Antenna 2, ultimate joint of peduncle a little longer than penultimate; flagellum 25-jointed. Mandible with a tooth at the top of eutting edge, and lower margin behind its lower angle slightly serrate (Fig. 7), molar obseure. Gmathopod 2, 5tk joint much longer than 34. Uropod 1, rami subequal. L. about 10 mm, Tropical Pacific (Tahiti). Taken in townet. Y Ä 9) 2 vn BE Kor h a „ N k R a a RER, la HE Sl DE Ed un A ui 1 Ba ah Bun a nn Ei en N! ee , n bh ak ni r 4 3 RIES EN * MOTe AR LPT TEEN UNE, Sc a Be he ae ne a a a an a 5 rn nd PUT Cyelocaris, Lysianella al : 2. C. guilelmi Chevreux 1899 C. g., Chevreux in: Bull. Soc. zool. France, v.24 p. 148 f.1—5. Body robust. Head with little recurved rostrum, lateral angles faintly indicated, post-antennal corners more salient, rounded. Side-plate 1 almost - rectangular, with spinule on lower margin, 24 rather larger, rounded below. Pleon segment 3, postero-lateral corners subacute. Eyes wanting. Lower — — Iip with lobes distally obliquely truncate. Mouth-parts in general form agreeing with €. tahitensis (p. 30), but mandible carrying a dentiform molar process, very elongate, curved at the extremity and furnished with a row of small setae. Gnathopod 1, 6'% joint rather stouter than in C. tahitensis, regularly tapering. Gnathopod 2, 5% joint little longer than 34, Uropod 1, inner ramus °/, as long as peduncle, outer notably shorter. Uropod 2, inner ramus a little shorter than peduncle, outer ?/, as long as inner. L. 11—12 mm. Arctie Ocean (Lofoten Isles).. Depth 1095 m. 17. Gen. Lysianella 0. Sars 1882 Lysianella (Sp. un.: L. petalocera), G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.78 | 1890 L., G. O. Sars, Crust. Norway, v.1 p.50 | 1893 L., J. Bonnier in: Bull. sei. France Belgique, v. 24 p. 174 | 1893 L., A. Della Valle in: F. Fl. Neapel, 2.20 p. 797. Body shorter and stouter in JS than in ©; side-plates deep, 4! strongly excavate behind. Antenna 1 stouter in J, 1% joint of flagellum large and setose in d, small in O, accessory flagellum long in both sexes. Antenna 2 alike in JS and ©, about as long as antenna 1, penultimate joint of pedunele oval, broadly laminar, densely furred on inner surface. Mouth- organs prominent below. Upper lip jutting out much in front of epistome. Mandible strong, molar small and weak, palp short, attached behind molar, its 34 joint the longest. Maxilla 1, inner plate tapering, with 2 setae, otherwise normal. Maxilla 2, plates narrow, armed at apices. Maxillipeds, inner plates acutely tapering, outer plates narrow oval, palp slender, 24 joint longer than 1°, 4b rather small. Gnathopod 1 subchelate, 5th and 6tk joints sub- equal, 7'% small. Gnathopod 2, tending to minutely chelate. Peraeopods 1—5 slender. Peraeopods 3—5, 24 joint large, longer than broad. Uropod 3 small, rami subequal, as long as peduncle, outer ramus 2-jointed, the 24 about °/, as long as the 1%. Telson small, oval, entire or partially cleft 2 species. Synopsis of species: ee ee en 1. L. petalocera . p.3l ar ER nie 2. L. dellavallei . p.32 1. L. petalocera O. Sars 1882 L. p., G. O. Sars in: Forh. Selsk. Christian., nr.18 p.78 t.3 f.3,3a | 1890 L. p., G. O. Sars, Crust. Norway, v.1 p.dl t.18 f.2 | 1893 .L.p., A. Della Valle in: F. Fl. Neapel, v.20 p. 797 t.61 £.9. Head, lateral corners subangular, less projeeting in J than in ©. - _ Pleon segment 3, corners obtusely rounded. Eyes oval, dark purplish brown - with reddish coating, larger in d. Antenna 1, flagellum 8-jointed, accessory - flagellum 4-jointed, 1° joint the longest; antenna 2, flagellum 8-jointed. - Gnathopod 1, 6th joint of nearly uniform width, palm oblique, not very large, - finger short, simple. Gnathopod 2, 6tk joint about half length of 5, produced 0‘ NE a IN > ae Ef 32 Lysianella, Onesimoides at the tip, but not strongly. Telson not twice as long as broad, apex entire, evenly rounded. Colour whitish, intestine greenish, ova in pouch orange- coloured. L. © 5, C 3:5 mm. North-Atlantie, North-Sea and Skagerrak (South- and West-Norway). Down to 188 m. 2. L. dellavallei Stebb.*) 1895 Anonyx petalocerus (non Lysianella petalocera G.O. Sars 1882!), A. Della Valle in: F. Fl. Neapel, «.20 p.816 t.61 £.1—9. Head, lateral angles rounded. Antenna 1 in Q, flagellum 9-jointed, accessory flagellum with 5 subequal joints. Antenna 2, flagellum 12- Jemen. Telson eleft a quarter of the length. L. 5 mm. Gulf of Naples. 18. Gen. Onesimoides Stebb. 1888 Onesimoides (Sp. un.: O. carinatus). T. Stebbing in: Rep. Voy. Challenger, v.29 p.647 | 1893 O., J. Bonnier in: Bull. sei. France Belgique, v.24 p.174 | 1893 O,, A. Della Valle in: F. Fl. Neapel, ©. 20 p. 796. Head with small subacute lateral lobes. Side-plate 1 almost com- pletely clear of the head. Antennae 1 and 2 subequal, short, in antenna 1 first joint of flagellum and of accessory flagellum long, the latter expanded over the former. Antenna 2, ultimate and penultimate joints of pedunele subequal. KEpistome pro- jeeting a little in front of upper lip. Mandible, molar denticulate, palp set just over it, with 1° joint not. very short, 24 long (Fig. 8). Maxilla 1, inner plate with 2 setae on the narrow apex, outer plate broad, obliquely truncate, . with 11 spines, palp with‘9 spine-teeth on long 24 joint in right, 12 in left maxilla. Maxilla 2, inner plate little shorter than outer. Maxillipeds, inner plates with 3 apical spine-teeth, outer plates reaching end of palp’s 24 joint, margin beset with teeth and spines, palp robust. 4% joint Fig.s. O.carinatus,. Unguiform, short. Gnathopod 1 subchelate, 5" joint short, Mandible. 6th robust, oblong, palm transverse, finger as long as palm, 4th, 5th and 6t joints strongly setose on hind margin. Gnathopod 2 weak, minutely chelate, 6!" joint rather longer than broad, the minute finger in middle of apical margin. Peraeopods 1—5, 7t% joint short. Peraeopods 3—5, 24 joint expanded, in 5th oreatly, as long as broad. Uropod 3 short, outer ramus as long as peduncle, with a short 24 joint, inner ramus rudimentary. Telson short, as broad as long, rounded, apically truncate. 1 species. 1. O. carinatus Stebb. 1888 O.c., T. Stebbing in: Rep. Voy. Challenger, v.29 p- 648 t.14 | 1893 O. c., A. Della Valle in: F. Fl. Neapel, 0.20 p. 796 t. 60 f. 59 —4l. Peraeon with all but chiefly last 2, and pleon with first 4 segments carinate, body furred; pleon segment 3, lower corners quadrate. Antenna 1, flagellum 12-jointed, accessory flagellum 4-jointed. Antenna 2, flagellum 9-jointed. Side-plate 1 broader above than below. Uropod 1, rami unequal; uropod 2, rami subequal. L. 11—12 mm. Coral Sea (North-East-Australia). Depth 2560 m. *) Nom. nov. After Antonio Della Valle, F 3 ; 4 E 3 E E r 4 b 3 E R \ ; 3 a ala dB un u ala Bart be LS Sun Ze aa urn hd In a iin um lln aan ash et aa ar us alleine, ni Sn ln ei ’ ni > er ’ * ” Pseudalibrotus 33 19. Gen. Pseudalibrotus Della Valle 1871 Onisimus (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 112 | 1876 Onesimus (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p. 161 | 1893 Pseudalibrotus (Sp. un.: P. littoralis) (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.798 | 1896 P., G. O0. Sars in: Bull. Ae. St.-Petersb., ser.5 v.4 p. 422. Body rather slender and compressed. Side-plates not very large, 4th pair deeply but narrowly emarginate behind. Antenna 1 and 2, with many short joints in the flagella both of S and oO. Epistome not distinctly defined from upper lip, both together forming a rounded prominence. Lower lip with front lobes a little emarginate distally. Mandible, molar rather strong, palp large, set well forward. Maxilla 1, inner plate small with 2 setae, outer plate broad, obliquely truncate, palp with small apieal teeth. Maxilla 2, inner plate much shorter than outer. Maxillipeds normal, outer plates crenulate, not reaching end of 24 joint of palp, 1°—34 joints of palp robust, 4! small, unguiform. Gnathopod 1 subchelate, 6!" joint a little longer than 5th, oblong, palm oblique, 7% joint simple. Gnathopod 2, 6th joint about half length of 5t", slender, oblong, more or less produced, sub- chelate or chelate. Peraeopods 3—-5, 24 joint large, longer than broad. Uropod 3, rami longer than pedunele, outer rather the longer. Telson short, broad, entire. 3 species. Synopsis of species: 1 | Gnathopod 1 very robust .... 2... 2. 1. P.litoralis. . . p.33 Gnathopod 1 not very robust — 2. Pleon segment 3, postero-lateral corners considerably 9 BE en a a 2. P. caspius . . . p.34 Pleon segment 3, postero-lateral corners scarcely ee BR eg NER Ta 3. P. platyceras . p.34 1. P. litoralis (Kreyer) 1845 Anonyx I, Kreyer in: Naturh. Tidsskr., ser. 2 v.1 p.621 | 1846 A. littoralis, Kreyer in: Voy. Nord, Crust. t.13 f.1a-t | 1862 Alibrotus I,, Bate, Cat. Amphip. Brit. Mus., p.86 t.14 f.7|1891 A.l., G. ©. Sars, Crust. Norway, v.1 p.102 t.35 £.2 | 1894 A. Titoralis, T. Stebbing in: Bijdr. Dierk.. 0.17 p.9 | 1866 Lysianassa l., Go&s in: Öfv. Ak. Förh., v.22 p.521 | 1871 Onisimus l., A. Boeck in: Forh. Selsk. Christian., 1870 p.112 | 1875 O.1l., Cam. Heller in: Denk. Ak. Wien, »v.35 p-31 t.2 1.8—16 | 1876 Onesimus l., A. Boeck, Skand. Arkt. Amphip., ©.2 p. 162 t.5 f.7 | 1893. Pseudalibrotus littoralis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 799. Head, lateral lobes narrowly rounded, little prominent. Side-plate 1 much expanded distally. Pleon segment 3, postero-lateral angles minutely outdrawn, almost quadrate. Eyes small, rounded oval, red. Antenna 1, 18 joint more than twice as long as 24 and 39 combined, flagellum in © with 26 joints, 1° much the largest, accessory flagellum with 5 joints, 1% as long as the rest combined. Antenna 2, ultimate joint of peduncle shorter than pen- ultimate, flagellum in oO about 30-jointed. Flagella in J rather longer than in O and with many more joints. Gmathopod 1 strong, 5t% joint distally broad, 6% hroadly oblong, palm spinulose, with 2 spines at the angle. Gnathopod 2, palm minutely produced. Peraeopods 1 and 2, 6tk joint slightly eurved. Peraeo- pods 3—5, 5tk and 6 joints slender. Uropod 2, inner ramus constrieted. Uropod 3, outer ramus with small 24 joint and setose on inner margin. Telson rounded, scarcely longer than broad, distal border faintly emarginate in -the centre, carrying two spinules.. Colour whitish. L. 13—18 mm. Arctic Ocean (North-Norway). Das Tierreich. 21. Lief.: T. R. R, Stebbing, Amphipoda I. 3 34 Pseudalibrotus, Nannonyx E FE E E X 2. P. caspius O0. Sars 1896 P. ce. (Onesimus ce. + O. pomposus, OÖ. Grimm in MS.), G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 0.4 p.422 t.1 £.1—20. Body rather stout, back strongly curved. Head, lateral lobes narrowly rounded. Side-plate 1 distally expanded, much broader than 24 or 34, Pleon segment 3, postero-lateral angles acute, considerably produced. Eyes rather small, rounded oval, probably bright red. Antenna 1, 1° joint large, flattened, twice as long as 24 and 34 combined, flagellum about twice as long as peduncle, with 16 joints, 1° much the largest, with 5 faseicles of filaments, accessory flagellum with 4 joints, 1% much the longest. Antenna 2 rather longer, ultimate joint of peduncle not very long, narrower and shorter than penultimate, flagellum longer than in antenna 1, about 20-jointed. Mouth-parts nearly as in P. litoralis, but palp of mandible attached‘over molar, not in advance of it, palp of maxilliped less robust. Gnathopod 1 not robust, 6*" joint scarcely as broad as 5tt, somewhat narrowing distally, palm rather short, with single spine at the angle, finger small. Gnathopod 2 very slender, 6 joint produced so as to form a little definite chela. Peraeopods 1—5 shorter and less slender than in P. litoralis. Peraeopods 3—5, 24 joint with few serrations on the hind margin. Uropods 1 and 2, rami simple, with scattered spines. Uropod 3, pedunele rather short, rami simple, with no 24 joint to outer ramus. Telson about as long as broad, apex slightly produced between a pair of notches, each of which carries a setule. L. 9 mm. 1 Caspian Sea, middle part. Depth 150-470 m. 3. P. platyceras O.Sars 1896 P. p. (Onesimus p. O. Grimm in MS.), &. O. Sars in: Bull. Ac. St.-Pätersb., ser.5 v.4 p.426 t.1 f.21—23. Very like P. caspius, but twice as long and more tumid, back broadly rounded, pleon segment 4 with marked dorsal depression. Head, lateral 3 lobes subangular. Side-plate 1 comparatively broader than in P. caspius. | Pleon segment 3, postero-lateral corners acute, but very little produced. | E 4 - Wi a ne A De A an ae x REN Eee a he Eyes narrowed above to an obtuse point. Antenna 1, 1° joint exceedingly large, conspieuously flattened, flagellum rather slender, with 30—40 joints, accessory flagellum with 6 joints. Antenna 2 scarcely longer, flagellum 34-jointed. Gnathopod 1, 6t joint rather shorter in proportion to its breadth, palm less oblique. L. Q 20 mm. { Caspian Sea, middle part. Depth 75 m. j ’ 20. Gen. Nannonyx 0. Sars 1871 Orchomene (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 114 | i 1890 & 91 Nannonyx (Sp. un.: N. goesii), G. ©. Sars, Crust. Norway, v.1 1.24; p.71| 3 1893 N., J. Bonnier in: Bull. sei. France Belgique, v.24 p.173 | 1893 N., A. Della Valle in: F. Fl. Neapel, v.20 p. 79. Body compact, side-plates large. Mandible elongate, molar obsolete, i palp affıxed far back. Maxilla 1, inner plate with 1 or 2 small setae, i plumose or simple. Maxilla 2, both plates long, narrow. Maxillipeds, inner plates generally elongate, narrow, outer plates long and broad, glightly erenulate, reaching beyond the 24 joint of palp, 4 joint of palp distine® but rudimentary 3 in size. Gnathopod 1 simple. Gmathopod 2 minutely chelate. Uropod 3 \ very small, the outer ramus the longer, 2-jointed. Telson entire. 5 species, Synopsis of species: Sr a ER a N 1 { Maxillipeds, inner plates not elongate or narrow 1. N. spinimanus . . p.35 Maxillipeds, inner plates elongate, narrow — 2. ln Sala ae a he wa de 7 na a ae rl ee hi sh DEN ET ME ER : a N Te a. ia As a Sri A al DE ade Dee ln pen Alle A a a nn DEE a nal al un 0 NER EN “ f - ar 4 e" x Nannonyx i 35 Uropod 3, outer ramus with 2d joint econspieuous 2. N. integriecauda. . p.35 Uropod 3, outer ramus with 2d joint minute — 3. 3 | Side-plate 4 little expanded backward .. . . . 3. N.goösii . .. . . p- 36 Side-plate 4 greatly expanded backward — 4. j u H Pleon segment 3, angles acutely upturned . . . 4. N.thomsoni . . . p.36 Pleon segment 3, angles rounded . . . .... BEN. Bidderi.‘.........D.86 1. N. spinimanus A. Walker 1895 N. s., A. O. Walker in: P. Liverp. biol. Soe., v.9 p.292 t.18 f. 1—11; t.19 f. 6a. Pleon segment 3, postero-lateral angles rather acute with the point blunt, hind margin straight, serrate, 4{h segment with prominent rounded hump. Antenna 1, flagellum 7-jointed, accessory flagellum 4-jointed. Antenna 2, flagellum in S and 9 5-jointed, shorter than pedunele. Mandible with broad eutting edge. Maxilla 1, inner plate with 2 setae, outer plate broad, apex decurrent. Maxilla 2, inner plate twice as broad as outer. Maxillipeds, inner plates not reaching beyond 1° joint of palp, outer plates with spine-teeth fringing inner margin, 4% joint of palp very small. Gnathopod 1, 5!" and 6% joints stout, 6% little longer than 5tk, tapering distally more in JS than in 9, leaving a small palm margin. Gmathopod 2 subchelate, 6% joint rather shorter than 5th and nearly as wide. Peraeopods 3—5, 24 joint expanded, 4t" in peraeo- pods 3 and 4 wider and more produced than in peraeopod 5. Uropods 1.and 2, rami shorter than peduncles. Uropod 3, outer ramus in J rather shorter than peduncle, in © about half as long as peduncle, inner ramus ovate. Telson as broad as long, distally narrowed and rounded, carrying a pair of marginal spinules.. Colour brown. L. 45 mm. Menai Strait [North-Wales]. 2. N. integrieauda (Stebb.) 1888 Ambasia i., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 695 t. 26. Side-plate 1 distally somewhat, 4!" very considerably, expanded. Pleon segment 3, postero-lateral angles outdrawn into a little blunt point; 4th without perceptible dorsal depression. Antenna 1, 24 joint half length of 1%, flagellum 5-jointed, shorter than 1° joint of: pedunele, accessory flagellum 2-jointed. Antenna 2 (9?), last 3 joints of pedunele nearly equal, flagellum small, with 4 joints, the first the longest. Mandible, 1° joint of palp rather long. Maxilla 1, inner plate distally rounded, with one simple seta, outer plate with 11 spines, palp carrying 4 spines on apex of 24 joint. Maxilla 2, _ plates subequal, not very narrow. Maxillipeds, inner plates long, narrow, with a few small setae and perhaps 3 tooth-spines on the apex, outer plates reaching halfway along 34 joint of palp, 4% joint of palp very small, the nail forming half its length. Gnathopod 1, 5t" and 6th joints subequal, very scantily armed, not very long, 6t* joint tapering, without palm. Gnathopod 2, 39 joint as long as 5th, 6th half length of 5t". Peraeopod 1 slender, 7b joint rather elongate. Peraeopods 3—5,: 24 joint expanded, overlapping 34, 4th not very broad. Pleopods, peduncle broad, each ramus only 4-jointed, the outer with an extremely - broad 1° joint, 1° joint of inner narrow. Uropod 3, the short outer ramus subequal in length to the peduncle, its 24 joint nearly as long as the 1, inner ramus more than half length of outer, each with inner margin serrulate. Telson tapering to a rounded apex. L. 3 mm. Royal Sound [Kerguelen Island]. Depth 50 m. 3*+ 36 Nannonyx 3. N. goösii (Boeck) 1871 Orchomene g., A. Boeck in: Forh. Selsk. Christian., 1870 p.116 | 1872 & 76 O. g., A. Boeck, Skand. Arkt. Amphip., v.1 t.4 f.5; v.2 p.177| 1890 & 91 Nannonyx g., G. O. Sars, Crust. Norway, v.1 t.24 f.3; p.72 | 1895 N. g,, A. Della Valle in: F. Fl. Neapel, v.20 p. 794. Back broadly rounded. Head with lateral angles broadly rounded- Side-plates deep, 4!" deeply but .not widely emarginate behind, 5t% rather deeper than broad. Pleon segment 3, postero-lateral angles quadrate, hinder edge faintly erenulate, segment 4 with hump-like dorsal projection. Eyes oval, dark brown. Antenna 1, 1° joint twice length of 24 and 34 combined, flagellum short, of 4 joints, 1° as long as other 3 combined, accessory flagellum 2-jointed. Antenna 2 in O, ultimate joint of .peduncle shorter than either penultimate or antepenultimate, flagellum short, 4-jointed. Mandible, 1° joint of palp very short. Maxilla 1, inner plate slender, with single simple seta on the acute apex, palp without apical spines. Maxilla 2, plates very narrow. Maxillipeds, with many diverging setae about the base, inner plates elongate, outer large and long, minutely erenulate, 4 joint of palp very small, knoblike. Gnathopod 1 powerful. none of the joints long, 4*h, 5th and 6th joints densely setose, 5!" and 6" subequal in length, 6!" tapering, 7!" very small. Goatho- pod 2, 34 joint as long as 5tb, 6th very narrow, about half length of the 5th and narrower. Peraeopods 1—-5 short and stout, 7t" joint very small. Peraeopods 3—5, expansion of 24 joint overlapping 34, 4th joint rather wide. Uropod 3 very small, rami shorter than peduncle, outer nearly twice as long as inner, its second joint minute. Telson rounded quadrangular, apex truncate (notched, Boeck). Colour yellowish, with transverse orange bands. Eggs in pouch dark violet. L. Q 4 mm. Aretie Ocean, North-Atlantie and North-Sea (West-Norway). Shallow water to 75m. 4. N. thomsoni Stebb.*) 1879 Lysianassa kröyeri (err., non Ephippiphora kroyeri A. White 1847!), G. M. Thomson in: Tr. N. Zealand Inst., v.11 p. 237. . $Side-plate 1 considerably expanded below, 4 very greatly. Pleon segments 3, 4 and 5 slightly carinate, the postero-lateral angles of 3% acutely upturned. Eyes elongate. Antenna 1, 24 and 34 joints not extremely short, flagellum of few joints, all short. Antenna 2 in 9, ultimate and penultimate joints of peduncle subequal, flagellum 7-jointed; in J flagellum rather long and slender. Mandible, molar linear, 1° joint of palp rather long. Maxilla 1, inner » plate with minute seta on narrowly rounded apex, outer plate with 11 spines, 2% joint of palp apparently unarmed. Maxilla 2, inner plate rather the broader, obliquely truncate. Maxillipeds as in N. goösii, but little 4!" joint of palp has a minute nail. Gnathopod 1 not especially stout, 6% joint tapering, without palm, rather longer than 5t". Gnathopod 2, 34 joint as long as 5tk, 6tk not narrower than 5", more than halfaslong. Peraeopods 1 and 2, 4" joint long, 7b moderately small. Peräeopods 3—5, expansion of 24 joint overlapping 34, 4th rather wide. Pleopods narrow. Uropod 3, with inner ramus almost rudimentary, the outer with small 24 joint and not longer than peduncle. Telson very small, rather broader than long, sides slightly converging, apex truncate. L. 8 mm. South-Paeifie (Dunedin [New Zealand)). 5. N. kidderi (S. 1. Sm.) 1876 Lysianassa k., (S.I. Smith in:) Kidder in: Bull. U. S. Mus., v.3 p. 59. *) Nom. nov. After George Maleolm Thomson. E a. 4 . w 4 a Be a A a PS a nn es drin Ye Er ee ad BE 7 alu a mn Di read, u) a eh EP na nes ie A nn. Nannonyx, Lysianassa 37 Head, lateral angles quadrate, slightly rounded. Side-plate 1 very slightly expanded below, 4 greatly, the emargination strongly quadrate. Pleon segment 3, angles rounded. Antenna 1, 24 and 34 joints short, flagellum with 6 or 7 joints, accessory flagellum with 4 joints. Antenna 2, ultimate and penultimate joints of peduncle rather short, flagellum in © with 7 or 8 joints, in J stout, with 18 short joints, most with calceoli. Mouth- organs nearly as in N. thomsoni, but 24 joint of mandible-palp not so long. Maxilla 1, 2 very minute setae on inner plate. Terminal joint of maxillipeds showing no nail. Gnathopods 1 and 2, and peraeopod 3 nearly as in N. thomsoni. Branchial vesicles almost simple. Uropod 3 very short, one branch. bluntly conical, the other rudimentary. Telson as broad as long, sides slightiy converging, apex slightly concave. L. 3—4 mm. Southern Indian Ocean (Kerguelen Island). Rocky beaches. 21. Gen. Lysianassa M.-E. 1830 Lysianassa*) (part.), H. Milne Edwards -in: Ann. Sei. nat., v.20 p. 364 | 1840 Callisoma (nom. nud.), ©. G. Costa, Fauna Reg. Napoli; Crost., Cat. p.5 | 1851 C. (non L. Agassiz 1846, Öoleoptera!) (part.), A. Costa, Fauna Reg. Napoli, fasc. Marz. 1851 p.1 | 1855 Lyeianassa, T. Bell in: Belcher. Last Arct. Voy., v.2 p.406 | 1867 Subgen. Lysianassina, A. Costa in: Annuario Mus. Napoli, v.4 p.43 | 1888 Lysianax (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 681. 1676. Body compressed. Side-plates large. Antenna 1, 24 joint longer than usual in this family. Antenna 2 short in Q, long in d. Upper lip defined by a narrow ineision and produced forward to a large linguiform plate. Mandible slender, ceutting edge simple, molar very ‚small, palp attached . behind it, 1° joint not very short.” Maxilla 1, inner plate without setae, outer plate with erowded spines, palp eut into small teeth at apex. Maxilla 2, inner plate much broader than outer. Maxillipeds, inner plates normal, outer oval, without spines, minutely crenulate, palp long and slender. Gnathopod 1 simple. Gmnathopod 2 subchelate or almost chelate. Peraeopods 1—5 rather slender. Peraeopods 3—-5, 24 joint broadly expanded. Branchial vesicles with accessory folds on one side only. Uropod 2, with one ramus con- strieted. Uropod 3 not very small, rami narrowly lanceolate one-jointed, setose only in d. Telson small, entire or minutely notehed. 7 species accepted, 3 doubtful. Synopsis of accepted species: j Telson entire — 2. \ Telson minutely notehed — 6. f Pleon segment 3 wneinate . » >... 2.2... 1. L. plumosa . . . p.38 \ Pleon segment 3 not uneinate — 3. j Telson apically trüncate — 4. \ Telson apically rounded — 5. 1 „m 4 | Antenna 1, 1st joint bidentate ....... ... 2. L. bispinosa. . . p.38 Antenna 1, 1st joint smooth . ....: 2.2.2... 3. L. cubensis . . . p.38 5 | RRFTRER 2 tending to chelate . »..:.... 4 L. longicornis . . p.39 Gnathopod 2 simply subehelate . . . .. 2... 5. L. cinghalensis . p.39 Peraeopod 3, 2d joint rounded . ...:..... 6. L. variegata. . . p.39 6 | Peraeopod 3, 2d joint narrow proximally, expanded & N EEE N SP ET EEE Pe I 7. L. punctata . . . p.40 *) 2 HM name Lysianassa is not preoceupied by G. Münster (efr.: 1846, Herrmannsen, Ind. Gen. Malae., v.1 p. 637). . The Editor. 38 Lysianassa 1. L. plumosa Boeck 1861 L. costae (err., non H. Milne Edwards 1830)), Bate & Westwood, Brit. sess. Crust., ©.1 p. 74 f. | 1865 L. e., W. Lilljeborg in: N. Acta Soe. Upsal., ser.3 v.6 nr.1 p.21 | 1890 L.c., G. O. Sars, Crust. Norway, v.1 p.42 t.16 f.1 | 1871 L. plumosa, A. Boeck in: Forh. Selsk. Christian., 1870 p.96 | 1872 L.p. + L. costae, A. Boeck, Skand. Arkt. Amphip., v.1 p.116 t.3 £.5; p.118 t.4 f.1 | 1893 Lysianax septentrionalis, A. Della Valle in: F. Fl. Neapel, v.20 p. 788, Head, lateral angles produced, acuminate. Side-plates close set and deep, 4! deeply and widely emarginate behind. Pleon segment 3, postero- lateral angles sharply uncinate. Eyes broadly reniform, dark purplish. Antenna 1, flagellum with 10—12 joints, about as long as pedunele; accessory flagellum 3- or 4-jointed. Antenna 2 in 9 searcely longer than antenna 1, ante- penultimate joint of pedunele rather long, ultimate and penultimate subequal in length, flagellum with 8 joints. Antenna 2 in C longer than the body, ante- penultimate joint of peduncle short, ultimate twice as long as penultimate, flagellum filiform, with 60—70 joints. Gnathepod 1, 18! joint as long as rest of limb, 6" joint narrow, tapering, slightly longer than 5tk, 7tk small. (The subsigmoid shape attributed .by Boeck to the hand of gnathopod 1 in his single S specimen cannot be relied on as a normal character.) Gnathopod 2, 6th joint short, truncate or slightly excavate, forming a small palm. Peraeo- pods 1 and 2 with very lang plumose setae on the 4" joint in d. Telson oval, apically rounded, much shorter than peduncle of uropod 3. L. 12 mm. North-Atlantieand North-Sea (West-Norway, Great Britain, France). Down to 188m. 2. L. bispinosa (Della Valle) 1893 Lysianax bispinosus, A. Della Valle in: F. Fl. Neapel. 0.20 p. 792 t.1 f.5; 1,25 f. 16—21, Head with lateral lobes little prominent. Side-plates not very deep. Pleon segment 3, postero-lateral angles rounded. Eyes brown. Antenna lin Q, 1° joint distally produced into two unequal teeth. Antenna 2, ultimate and penultimate joints of pedunele tolerably large. Maxillipeds, outer plates reaching a little beyond 24 joint of palp. Peraeopod 3, 24 joint rounded. Telson subreetangular, distal margin straight. The other characters as in L. longi- cornis. Colour white, with brown spots, besides tints of orange and scarlet due to the internal organs, the appendages chalk-whitee L. 10 mm. — d unknown. Gulf of Naples. 3. L. eubensis (Stebb.) 1897 Lysianax c., T. Stebbing in: Tr. Linn. Soe. London, ser.2 ©.7 p.29 t. 7». Head, lateral angles broadly rounded. Side-plate 1 expanded below, 5% broader than deep. Pleon segment 3, postero-lateral angles almost quadrate, but with convex hind margin. Eyes large, oval, dark. Antenna 1, 1° joint not produced into apical teeth, flagellum small, of 6 or 7 joints, none long, accessory flagellum 2-jointed. Antenna 2 in O very small, peduncle slender, flagellum imperfect. Gnathopod 1, 5!" and 6tk joints subequal in length. Gnathopod 2, 6% joint more than twice as long as broad, bulging a little distally, transversely truncate, subchelate, finger minute, closely fitting the palm. Peraeopod 3, 24 joint broader than long. Peraeopod 4, 24 joint with convex front, sinuous hinder margin. Peraeopod 5, 24 joint large, oval. Uropod 2, inner ramus much dilated, and towards the end strongly and abruptly constrieted. Uropod 3 short, pedunele stout, rami subequal, slight. Telson boat-shaped, with truncate hind margin. L. 7'5 mm. Gulf of Mexico or Caribbean Sea (Cuba).? TEEN WR Lysianassa 39 4. L. longicornis H. Luc. 1845/46 L. !., H. Lucas in: Expl. Algörie, An. artie., v1 p.53 Crust. t.5 f.2 | 1866 L. I. (part.), E. Grube in: Arch. Naturg., v. 821 p. 896 t.9 f.8(8) | 1866 L. 1, Cam. Heller in: Denk. Ak. Wien, «. 26u p.17 t.2 f£.12—15 | 1892 L. 1, A.O. Walker in: Ann. nat. Hist., ser.6 v.9 p.135, 136 | 1867 Lysianassina 1. ++ ?L. filicornis, A. Costa in: Annuario Mus. Napoli, v.4 p.43 | 1893 Lysianaz 1., A. Della Valle in: F. Fl. Neapel, v.20 p. 790 t.3 f.6; 1.25 f.1—15 | ?1853 Lysianassa spinicornis, A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.172 | ?1857 L. s., A.Costa in: Mem. Ace. Napoli, v.1 p.185 t.1 f.4 | ?1857 L. loricata, A. Costa in: Mem, Ace. Napoli, v.1 p.186 t.1 f.5 | ?1862 L. filicornis, A. Costa in: Annuario Mus. Napoli, v.1 p.80 t.2 f.18—23 | ?1889 Lysianax ceratinus, A. O. Walker in: P. Liverp. biol. Soe., ©. 8 p.200 t.10 f.1—8 | 1899 L. e., Chevreux in: C.-R. Ass. Frane., Sess. 27 0.2 p.476. Head, lateral angles produced, rounded. Side-plates close set, deep, 1° a little widened distally. Pleon segment 3, postero-lateral angles rounded. Eyes broadly reniform, red. Antenna 1, 1° joint with inner distal margin produced into a spiniform process, varying from large to evanescent, 22 joint about half length of first, or more, 39 short, flagellum with 10 joints, 1° not long, accessory flagellum with 3—5 joints. Antenna 2, ultimate joint of peduncle much longer than penultimate in C, flagellum in d much longer than body. Gmnathopod 1, 5 joint a little shorter than 6th, 6th tapering, 7th small. Gmathopod 2, 6! joint with distal hind margin prolonged into a kind of lobe, rough with spinules. Peraeopod 3, 24 joint elliptical, broader than long. Peraeopod 4, 24 joint with hind margin rather sinuous. Peraeo- pod 5, 24 joint very broad, but longer than broad. Uropods all with awl- shaped rami, more or less armed with spines. Telson elliptical, apically rounded. Colour grey dorsally. Side-plates rusty-yellow and greyish with scattered little white spots. Flagella of antennae cerimson. L. 8—10 mm. Mediterranean; North-Atlantic and North-Sea (Great Britain). 5. L. einghalensis (Stebb.) 1897 Lysianax e., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.28 t.7a. Head, lateral lobes produced, the apices rounded. Side-plates 1 and 4 distally much widened. Pleon segment 3, postero-lateral angles rounded. Eyes very large and dark, meeting on the top of the head. Antenna 1, 15 joint tumid, 24 and 34 not extremely short. flagellum with 6 joints, none long, accessory flagellum with 3 joints. Antenna 2, as usual in Ö, flagellum 35-jointed, slender, reaching about to middle of pleon. Maxillipeds, inner plates long, outer plates large but not reaching beyond 24 joint of palp. Gnatho- pod 1, 6tk joint slightly longer than 5%. Gnathopod 2, 34 joint as long as 5th 6th rather more than half length of 5%, subchelate, minute finger elosing down on small transverse palm. Peraeopods 3—5, 24 joint broadly expanded, produced. below the 34 joint. Uropod 3, peduncle elongate, rami fringed with a few long setae. Telson much longer than broad, apically rounded. L. about 8 mm. Indian Ocean (Trincomali [Ceylon]). Surface. 6. L. variegata (Stimps.) 1855 Anonys variegatus, Stimpson in: P. Ac. Philad., -©.7 p.394 | 1862 Lysianassa variegata, Bate, Cat. Amphip. Brit. Mus., p. 67 t.10 £. 7 | 1888 Lysianax variegatus, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 682 t. 23. Head, lateral lobes produced, rounded. Side-plate 1 distally widened, 4th with lower expansion deep, not broad. Pleon segment 3, postero-lateral angles forming a minute tooth far upturned. Eyes large, reniform, very dark in spirit. Antenna 1, 1° joint tumid, 29 much longer than 34, flagellum 40 Lysianassa, Perrierella 8-jointed, accessory flagellum 4-jointed. Antenna 2 in ©, ultimate joint of peduncle slightly longer than penultimate, flagellum 8-jointed; in JS ultimate joint of peduncle twice length of penultimate, flagellum with 53 joints, calceoli on many of them. Mandible, palp set far back, 1° joint rather long. Maxillipeds, outer plates large, reaching beyond 24 joint of palp, 4" joint of palp very small. Gmnathopod 1, 6%" joint much narrower and slightiy longer than 5%. Gnathopod 2, 34 joint rather longer than 5t", 6th oval, with convex palm. Peraeopods 1 and 2, 4th and 5tk joints fringed with plumose setae. Peraeopod 3, 24 joint broad, rounded. Peraeopods 4 and 5, 24 joint somewhat produced downward. Branchial vesicles with large accessory lobes. Uropod 3, rami shorter than peduncle, broadly lanceolate, setose on opposed margins, the outer rather the longer. Telson little longer than broad, much shorter than pedunele of uropod 3, distally squared, with a small central notch. Colour yellowish mottled with brown, with scattered white dots.. L. 14 mm. Simon’s Bay [Cape of Good Hope]. Depth 33 m. 7. L. punctata (A. Costa) 1840 Callisoma p. (nom:-nud.), O. G. Costa, Fauna Reg. Napoli, Crost., Cat. p.5 | 1851 C. punctatum, A. Costa, Fauna Reg. Napoli, fasc. Marz. 1851 p.4 t.8 f£.4—7 | 1851 (©. p., (A. Costa in:) F.W. Hope, Cat. Urost. Ital., p-23, 44 | 1893 Lysianax punctatus, A. Della Valle in: F. Fl. Neapel, v.20 p.789 t.6 f.6; 1.25 f. 22-32. Head, lateral angles produced, rounded; Side-plate 4 greatly expanded below, expansion not deep, but very broad. Pleon segment 3, postero- lateral angles rounded. Eyes red-brown. Antenna 1 in ©, 1° joint tumid,. 24 and 34 comparatively short, flagellum very short, 6- or 7-jointed, accessory flagellum 3-jointed. Peraeopod 3, 24 joint attached to a eleft in the side- plate, narrow above, greatly expanded below. Peraeopods 4 and 5, 24 joint produced downward below the 34. Telson elongate, subreetangular, distally with a shallow but rather wide notch. The rest as in L. longicornis (p. 39). Ground colour citron-yellow, with a generally red hue from very numerous scarlet ehromatophores; appendages colourless or greyish. L. © 6—7 mm. Gulf of Naples. Upon the pleon of Paguri laden with eggs, matching the colour of its resting-place. L. costae M.-E. 1830 L.c., H. Milne Edwards in: Ann. Sei. nat., v.20 p. 365 6:I10:-8.47, L. 6-7 mm. 2. Gulf of Naples. L. nasuta Dana 1853 &55 L. n., J. D. Dana in: U. S. expl. Exp., v. 13u p. 915; t.62 f. 2a—m | 1893 Lysianax n., A. Della Valle in: F. Fl. Neapel, v.20 p. 793. L. 10 mm. ö Tropical Atlantie (Rio Janeiro [Brazil]). L. pilicornis Heller 1866 L. p., Cam. Heller in: Denk. Ak. Wien, v. 26u p.17 1.2 £. 16. L. 8-9 mm. (. Adriatie (Lesina). 22. Gen. Perrierella Chevreux & E. L. Bouv. 1892 Perrierella (Sp. un.: P. crassipes), Chevreux & E. L. Bouvier in: Bull. Soe. zool. France, v.17 p.50 | 1893 Ps, J. Bonnier in: Bull. sei. France Belgique, v.24 p.181 | 1893 P., A. Della Valle in: F. Fl. Neapel, v.20 p.840 | 1895 P., G. ©. Sars, Crust. Norway, ®.1 p.677 | 1892 Puraristias (Sp. un.: P. audowinianus), D. Robertson in: P. nat. Hist. Soc. Glasgow, n. ser. v.3 p. 201. Perrierella, Normanion 41 Body compact. Side-plates not large, 1° partly concealed. Both pairs of antennae short, pedunele of antenua 1 rather elongate. A deep groove between epistome and upper lip. Mandible stout, molar obsolete, 1° joint of palp very short. Maxilla 1, inner plate with 3 setae, outer with 7.(?) spines, palp with minute teeth and spines. Maxilla 2, plates rather short, inner the broader. Maxillipeds, inner plates minute, carrying 3 spines, outer elongate with spines on inner margin, palp only 3-jointed, not reaching beyond outer plate. Gnathopod 1, 6% joint rather longer than 5tt, oval, making an approach to a palm, so as to be weakly subchelate. Gnathopod 2 slender, elongate, subchelate or almost cbelate. Peraeopods 1—5 short and stout, 4th joint rather broad, 6tk produced to a short tooth-like process. Uropod 3, peduncle short, rami short, outer rather the longer, 2-jointed. Telson entire. l species. 1. P. audouiniana (Bate) 1857 Lysianassa a., Bate in: Ann. nat. Hist., ser. 2 v.19 p.138 | 1862 L.a., Bate, Cat. Amphip. Brit. Mus., p.69 t.11 f.1 (exel. 1g) | 1889 Lysianax audowinianus, A. OÖ. Walker in: P. Liverp. biol. Soe., v.3 p.203 t.10 f.9,10 | 1890 Aristias audouiniana, Meinert in: Udb. Hauchs, v.3 p.152 t.1 f.1—6 | 1892 Pararistias audowinianus, D. Robertson in: P. nat. Hist. Soc. Glasgow, n. ser. v.3 p.201 | 1893 Perrierella audouwiniana, J. Bonnier in: Bull. sei. France Belgique, ©.24 p.175 t.5 | 1895 P. a., G. O. Sars, Crust. Norway, v.1 p.678 t.ı f.2 | 1875 Aristias tumidus (err., non Anonyx t. Kreyer 1846!), Cam. Heller in: Denk. Ak. Wien, v.35 p.30 t.2 f.1—7 | 1892 Perrierella crassipes, Chevreux & E. L. Bouvier in: Bull. Soe. zool. France, v.17 p.50 f. | 1893 P.c., A. Della Valle in: F. Fl. Neapel, v.20 p. 841. Head deep, lateral angles slightly produced. Side-plate 4 little emarginate behind. Pleon segment 3 at postero-lateral angles almost quadrate. Eyes large, irregularly oval, dark with chalky white coating. Antenna 1, 24 and 34 joints not very short, flagellum with 4 joints, 15 the longest, accessory flagellum 2-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 4-jointed, much shorter than that of antenna 1. Palp of maxilla 1 ends in 4 erenulate teeth (Chevreux & Bouvier), or in 3 spines and a serru- late margin (Robertson, Sars’ figure), or in 3 setae (Heller), or in 8 spinules (Bonnier). Maxillipeds, the palp has a tubereuliform 4" joint (Chevreux & Bouvier, contrary to Heller, Bonnier and Sars). Uropod 3 has the rami finely serrulate. Telson nearly twice as long as broad (Sars; not so long in Bonnier’s figure), narrows distally to a slightly emarginate apex. Colour yellowish (Sars), whitish slightly tinted with rose on the back (Chevreux), eggs pale green (Bonnier).. L. 2—4 mm. North-Atlantie, North-Sea and Kattegat (Great Britain, France, West-Norway); Mediterranean. Commensal in sponges. g i 23. Gen. Normanion Bonnier 1871 Normania (Sp. un.: N. quadrimana) (non G.S. Brady 1866, Ostracoda)), A. Boeck in: Forh. Selsk. Christian., 1870 p.119 | 1890 N., G. O. Sars, Crust. Norway, v.1 p.82 | 1893 N., A. Della Valle in: F. Fl. Neapel, v.20 p.796 | 1893 Normanion, J. Bonnier in: Bull. sei. France Belgique, v.24 p. 167, 173 | 1895 N., G. O. Sars, Crust. Norway, v.1 p. 674. Body compact, side-plates not very deep, 4*h little excavate behind. Pleon segment 3, postero-lateral angles rounded. Antenna 1 and 2 in O short, 24 and 34 joints of antenna 1 not extremely short. Epistome not defined from upper lip. Mandible, molar weak, palp long, set far back, 1° joint short.‘ Maxilla 1, inner plate with 2 small apical setae, 24 joint: of palp broad. Maxilla 2, plates rather narrow, only apically armed. Maxillipeds, inner plates long and narrow, outer long and broad, unarmed, reaching much 42 Normanion, Paratryphosites beyond the 3-jointed palp, of which the 24 joint is shorter than the 1#. Gnathopod 1 subchelate, 3% joint longer than 4th, 6th greatly expanded, broader than long, 7th as long as the breadth of 6tb. Gnathopod 2 minutely chelate. Peraeopods 1—5 slender. Peraeopods 3—5, 24 joint longer than broad. Branchial vesicles almost simple. Uropod 3, peduncle long, rami narrowly lanceolate, outer slightly the longer. Telson short, entire, rounded quadrangular. 2 species. Synopsis of species: Gnathopod 1, process of 5th joint obtuse. ...... 1. N. quadrimanus . p.42 . Gnathopod 1, process of 5th joint acaute . ...... 2. N. safsl: .. ...-. . Das 1. N. quadrimanus (Bate & Westw.) 1868 Opis quadrimana, Bate & Westwood, Brit. sess. Crust., ©.2 p.503 f. | 1895 Normanion amblyops, &. O. Sars, Crust. Norway, v.1 p.674 t.1 £.1. Eyes large and confluent, visual elements imperfeetly developed, light reddish brown, slightiy areolated. Antenna 1, 1° joint not twice as long as 24 and 34 combined, flagellum with 6 joints, 1° rather long, accessory flagellum 4-jointed. Antenna 2 in C, ultimate joint of peduncle shorter than penultimate, flagellum 6-jointed. Gnathopod 1, 34 joint considerably longer than 4th, 5th with a comparatively short and obtusely rounded expansion, 6tk much broader than it is long, palm transverse, defined below by a dentiform projeetion with a comparatively small spine on each side, 7tk joint or finger rather slender and perfectly smooth. Telson, as figured, scarcely longer than broad. Body pellueid, pale yellowish with lateral orange patches. L. © 5°5 (Sars), about 3 mm (Bate & Westwood). Trondhjemsfjord. Parasitic on fish, from 370—-570 m. 2. N. sarsi Stebb.*) ?1871 Normania qvadrimana (err., non Opis quadrimana Bate & Westwood 1868!), A. Boeck in: Forh. Selsk. Christian., 1870 p.120 | ?1872 & 76 N. q., A. Boeck, Skand. Arkt. Amphip., v.1 t.6 f.3; v2 p.188 | 1890 N. q., G. O. Sars, Crust. Norway, v.1 p.33 t.13 f.1 | 1895 Normanion qvadrimanus, G. 0. Sars, Crust. Norway, v.1 p. 674. Head rather deep, lateral corners angular, only slightly projecting. Body somewhat compressed, back evenly vaulted. Eyes large, oval, visual elements unusually large, brownish, with orange-coloured evating. Antenna 1, flagellum with 5 joints, 1% of no great length, accessory flagellum slender, 3-jointed. Antenna 2 in O , flagellum 4-jointed. In other respects antenna 1 and 2 as in N. quadrimanus. Gnathopod 1, 34 joint a little longer than 4, 5th forming a narrow projecting lobe, 6t" a little broader than long, palm transversely truncated and armed below with 3 strong spines, 7* joint strongly serrate on concave margin. Telson a little longer than broad (Sars), broader than long (Boeck). Body whitish, pellueid, with yellowish intestine and dark bluish ovaries. L.5 (Sars), 4 mm (Boeck). North-Atlantie, North-Seaand Skagerrak (South- and West-Norway). Parasitieon fish. 24. Gen. Paratryphosites Stebb. : 1871 Hippomedon (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 102|1899 Paratryphosites (Sp. typ.: Lysianassa abyssi), T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 206. Pleon segment 3, postero-lateral angles acutely upturned. Antenna 1, 1° joint of flagellum not very large, accessory flagellum small. Antenna 2, *) Nom. nov. After Georg Ossian Sars. Paratryphosites, Paronesimus 43 ultimate and penultimate joints of pedunele subequal. Mandible, molar prominent. palp affıxed over it or a little in front, 24 and 39 joints subequal. Maxilla 1, inner plate carrying 5 setae, outer with the usual spines, palp broad at apex. Maxilla 2, with setae on inner margin of inner plate. Maxillipeds, outer plates reaching much beyond 24 joint of palp, with spine-teeth on straight inner margin. Gmathopod 1 subchelate, 6 joint shorter than 5*", of uniform width, palm oblique, well defined, overlapped by finger. Gmnathopod 2 sub- chelate, 5th joint distally widened, 6 a little more than half as long. Peraeopods 3—5, 24 joint large, serrate on hind margin, 4 expanded in 34 and 4th pairs, 4th pair the longest. Uropod 3, rami with many spinules, outer the longer. Telson little longer than broad, cleft scarcely reaching the middle, dehiscent, each apex carrying 5 spinules. 1 speeies. 1. P. abyssi (Go&s) 1866 Lysianassa a., Go&s in: Öfv. Ak. Förh., v.22 p.519 t.37 £.5 | 1871 Hippomedon a., A. Boeck in: Forh. Selsk. Christian., 1870 p.103 | 1872 H.a., A. Boeck, Skand. Arkt. Amphip., v.1 p.138 | 1890 H.a., G.O.Sars, Crust. Norway, e.1 p.56 | 1893 Euryporeia? a., A. Della Valle in: F. Fl. Neapel, v.20 p.848 | 1899 Lysianassa a., Paratryphosites sp. typ-, T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.206. Head, lateral angles acute. Eyes oval, red. Antenna 1, 1° joint long, eylindrical, not produced, flagellum with 10—12 joints, accessory flagellum with 3 subequal joints. Antenna 2, flagellum 22-jointed. L. reaching 17 mm. Aretie Ocean (north of lat. 68% 36' N.) Depth 38—528 m. 25. Gen. Paronesimus Stebb. 1894 Paronesimus (Sp. un.: P. barentsi), T. Stebbing in: Bijdr. Dierk., v.17 p. 14. Side-plate 1 not expanded below, 4! only slightly, lower hind margin obliquely truncate. Antenna 1, 1% joint tumid, 24 and 34 very short. Antenna 2, ultimate joint of peduncle much shorter than penultimate; flagella of both pairs short in ©. Mandible, molar not very strong, palp attached over the molar, much longer than trunk, 1° joint short, 34 subequal to 24. Maxilla 1, 2 setae on inner plate, 11 spines on outer, 4 or 5 spine-teeth on long 24 joint of palp. Maxilla 2, inner plate narrower than, much more than half as long as outer. Maxillipeds, 3 teeth on inner plates, outer plates with minute teeth on inner margin and 1 spine on apical, 39 and 4th joints of palp rather elongate. Gnathopod 1, 6" joint longer than 5%, its slightly curved oblong narrowed distally, forming a very short palm not in line with insertion of the short finger. Gnathopod 2, 34 joint as long as 5*", 6 much more than half as long as 5th, widening gradually to a sinuous palm, "zen joint strongly eurved. Peraeo- pods 1 and 2, 24 joint stout, rather short, 4!" rather large. Peraeopods 3—5, 24 joint much longer than broad, 4*h rather broad. Uropods 1—3, rami not elongate. Uropod 3, rami short, smooth, the outer the longer, with a small 24 joint. Telson au times as long as broad, cleft for nearly half its length. 1 species. 1. P. barentsi Stebb. 1894 P.b., T. Stebbing in: Bijdr. Dierk., v.17 p.14 t.2. Pleon segment 3, postero-lateral angles forming small upturned point. Antenna 1 in ©, flagellum, 1° joint much larger than next, accessory flagellum 4-jointed. Antenna 2 in O, flagellum 10-jointed. Telson with a spinule in each of the slightly divergent apices. L.? Arctie Ocean (lat. 76° N., long. 54° E.) Depth 125 m. 44 OÖrchomene 26. Gen. Orchomene Boeck 1871 Orchomene (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 114 | 1876 O., A. Boeck, Skand. Arkt. Amphip., v.2 p.171 | 1890 O., G. ©. Sars, Crust. Norway, v.1 p.59 | 1893 O., J. Bonnier in: Bull. sci. France Belgique, v.24 p.174 | 1873 Orchomena, E. v. Martens in: Zool. Ree., v.8 p.188. Side-plates large. Pleon segment 3, postero-lateral angles not produced, generally serrate. Antenna 1, flagellum in S with calceoli, accessory flagellum well developed (Fig.9). Antenna 2 in ©, antepenultimate joint of pedunele long, flagellum short, in C flagellum long filiform, with calceoli. Epistome projecting Flagellum Accessory flagellum roundly in front of upper. lip. Mandible long, molar very small, palp slender, set far back. Maxilla 1, 2 setae on inner plate, outer with apex scarcely oblique, palp with spine-teeth not numerous. Maxilla 2, both plates long, narrow, ‚setiferous only apically. Maxillipeds, inner plates Fig. 9. O. serrata. elongate, outer long oval, weakly crenulate, palp Ben Da tr 8 9 Dre] not very large. Gnathopod 1 short, stout, sub- chelate, 6% joint longer than distally widened 5*t, with distinet transverse palm, finger short, eurved. Gmathopod 2 slender, 6t% joint narrow, produced beneath the minute finger. Peraeopods 3—5, 24 joint very large. Uropod 3 in © scarcely reaching beyond uropod 2, in SG much larger and plumose. Cleft of telson not always reaching the centre. 6 species. Synopsis of species: Pleon segment 3, hinder edge coarsely serrate — 2. 1 2 Pleon segment 3, hinder edge finely serrate or smooth — 8. u j Pleon segment 4 with evenly rounded carina . O. serrata . . . p.44 \ Pleon segment 4 with cariua ending acutely. . . . 2. O. pectinata . . p.45 3 j Eyes dark — 4. \ Eyes not dark — 5... 2 4 j Pleon segment 3, hind margin‘ minutely erenulate 3. O.batei. . . . p.45 \ Pleon segment 3, hind margin perfeetly smooth . . 4. O.hanseni. . . p.46 Head, lateral angles acute, greatly projecting . 5. O. crispata. . . p.46 Head, lateral angles quadrate, slightly projecting. . 6. O. amblyops. . p.46 1. O.serrata (Boeck) 1861 Anonyx serratus, A. Boeck in: Forh. Skand. Naturf., Mode 8 p.641 | 1893 A. s., A. Della Valle in: F. Fl. Neapel, «.20 p.819 | 1871 Orcho- mene s. (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.115 | 1872&76 O.s., A. Boeck, Skand. Arkt. Amphip., v.1 t.5 f.2; 0.2 p.172 | 1890 & 95 O. s.,, G. O. Sars, Crust. Norway, v.1 p.62 t.23 f.1; p.682 t.IV £.1. Head, lateral angles considerably projeeting and obtuse. Pleon segment 3, lateral angles quadrate, with their hind margin straight, coarsely serrate, forming 16—20 points, 4? segment with evenly rounded dorsal carina behind the depression. Eyes narrow oval, tapering above in ©, broad oval ind. Antenna 1 (Fig. 9), flagellum with 8 joints, 1° very large, especially in JS, accessory flagellum 6-jointed. Antenna 2, flagellum 6-jointed in oO, little longer in J, but with 8 joints, 3 carrying calceoli. Gnathopod 1, 6®* joint of nearly uniform breadth, nearly twice as long as 5tk, which is equal to 4th. Peraeopods 3— 5, 24 joint subequal in length to rest of limb. Uropod 3 alike in Q and JS, inner ramus Orchomene 45 shorter than basal joint of outer, armed with 3 spinules. Telson broadly ovate, tapering distally, with 3 pairs of dorsal spinules, cleft narrow, reaching about to centre. Colour yellow or ochraceous. L. © 10, @ about 6 mm. Arctie Ocean, North-Atlantie and North-Sea (Norway). Depth 56—188 m. 2. O. pectinata O. Sars 1882 O. pectinatus, O. pectinata, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.80 t.3 £.5, 5a; p.120 | 1890 & 95 O. pectinatus, O. pectinata, G. O. Sars, Crust. Norway, v.1 p.64 t.23 f.3; p.682 | 1893 Anonya pectinatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 820. Head, lateral angles projecting, acute. Side-plate 1 dilated below. Pleon segment 3, postero-lateral angles scarcely rounded, their hind margin curved, with coarse and sharp upturned serration of 12—16 points, 4% segment with high carina ending acutely. Eyes narrow, slightly sigmoid, visual elements imperfectly developed; almost eream-eoloured. Antenna 1 inQ, flagellum with 13 joints, 1° Jarge, accessory flagellum 7-jointed. Epistome greatly projecting, evenly rounded. Gmnathopod 1, 6!" joint not much longer than 5th, a little tapering. Uropod 3, inner ramus as long as basal joint of outer, carrying 4 spinules. Telson small, with 2 pairs of small dorsal and a pair of apical spinules, cleft reaching nearly to centre, very dehiscent. Colour pale greyish - white. L. oO 12 mm. Arctic Ocean, North-Atlantie and North-Sea (West-Norway). Depth 226 m. 3. O. batei O.Sars ?1853 Lysianassa humilis, A. Costa in: Rend. Soe. Borbon., n. ser. v.2 p.172 | 1893 Anonyx h. + A. goesiü, A. Della Valle in: F, Fl. Neapel, v.20 p. 817 t. 26 £. 52—37; p. 273, 920 | 1895 A. h., Sowinski in: M&m. Soc. Kiew, v.14 p- 250 t.4 £.15—18; t.5 f. 1—7 | 1857 A. edwardsüi (err., non Kreyer 1846!), Bate in: Ann. nat. Hist., ser. 2 v.19 p.138 | 1861 Lysianassa longicornis (part.) (err., non H. Lucas 1845/46!) + Anonyx edwardsi, Bate & Westwood, Brit. sess. Crust., v.1 p.85 (figure of animal and pleon only); p.94 f. | 1882 Orchomene batei,; G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.81 | 1890 O.b., G. O. Sars, Crust. Norway, v.1 p.60 t. 22. Head, lateral angles projecting, broadly rounded in O, narrow linguiform in d. Side-plate 5 broader than deep. Pleon segment 3, postero-lateral angles almost quadrate, with hinder margin minutely erenulate, dorsal depression of 4th segment stronger in J than in O0. Eyes oval, slightly reniform, dark reddish brown, much larger in Ö than inoO. Antenna 1, flagellum with 8 joints, 1° large, accessory flagellum with 5 joints, 1% of moderate length. Antenna 2 in Q, ultimate joint of pedunele shorter than penultimate, scarcely as long as antepenultimate, flagellum 9-jointed; in S, ultimate joint of peduncle stout, full as long as penultimate and longer than antepenultimate, flagellum reaching the full length of the animal“ Epistome narrow linguiform, projeeting much. Gnathopod 1 short and stout, 6% joint not greatly longer than 5%, distally tapering. Gnathopod 2, 6% joint very narrow, oblong linear, minutely produced, ‚ the spiny armature unusually coarse. Uropod 3 in Q ‚inner ramus shorter than basal joint of outer, mucroniform, without spinules; in S, both rami long, and densely setose. Telson in © oblong quadrangular, scarcely tapering, about once and a half as long as broad, with 2 pairs of marginal spinules, cleft very short and wide, about one fourth of total length; telson in S more than twice as long as broad, with 3 or 4 pairs of spinules, cleft much narrower, nearly a third of the length. Body eream-coloured, each segment of peraeon with a reddish speck at the hind corners. L. © 7, d 8 mm. North-Atlantie, North-Sea and Skagerrak (South- and West-Norway, Great Britain, France). Depth 838—76 m. 46 Örchomene 4. O. hanseni Meinert ?1867 Anonyx melanophthalmus, A. M. Norman in: Rep. Brit. Ass., Meet. 36 p.201 | 1890 Orchomene hanseni, Meinert in: Udb. Hauchs, v.3 p.154 t.1 f.18—24 | 1895 O. h., G. O. Sars, Crust. Norway, v.1 p.681 t. III £.2. oO. Head, lateral angles somewhat projecting, narrowly rounded. Side- plate 5 rather broader than deep. Pleon segment 3, postero-lateral angles narrowly rounded, with hind margin perfectly smooth. Eyes unusually large, oblong oval, widened below, almost black. Epistome narrowly rounded and less projeeting than in O. batei (p.45). Antennae and limbs not distinguishable from those of O. batei, except that in gnathopod 2 the spines of the 6 joint are less coarse. Uropod 3, inner ramus simple, much shorter than outer. Telson about once and a half as long as broad, with a single pair of marginal spinules, eleft very short and angular, wider than deep. Colour uniformly whitish. L. 7—8 mm. — © unknown. Christianiafjord, Kattegat, North-Atlantie (Hebrides). Depth 14—90 m. 5. O. erispata (Goös) 1866 Lysianassa e., Gods in: Öfv. Ak. Förh., 0.22 p.519 t. 37 £.3 | 1890 Orchomene crispatus, G. O. Sars, Crust. Norway, v.1 p.63 1.23 f.2 | . 1893 Anonyax ce. A. Della Valle in: F. Fl. Neapel, v.20 p.819 | 1871 Orchomene serratus (part.) (err., non Anonyx s. A. Boeck 1861!), A. Boeck in: Forh. Selsk. Christian., 1870 p-115 | 1882 O.s., G. ©. Sars in: Forh. Selsk. Christian., nr. 18 p.81. Head, lateral angles greatly produced, acute. Side-plates very deep, 1° much overlapping the head, 4! as deep as broad. Pleon segment 3, postero-lateral angles rounded, with hind margin straight, finely serrated, 4 segment without dorsal projection. Eyes oblong linear, reddish brown with light orange coating. Antenna 1, 1° joint unusually narrow, almost as long as rest of antenna, flagellum with 9 joints, 1° not long, accessory flagellum 6-jointed. Epistome broad, little projeeting, obtusely truncate at tip. Gnathopod 1, 34 joint conspieuously longer than 4, 6tk much longer than 5th, sliehtly tapering to the transverse palm. Peraeopods 3—5, 24 joint much expanded, peraeopod 5 almost quadrate, Uropod 3, rami unusually broad. Telson short and broad, less than once and a half as long as broad, with 2 pairs of marginal spinules, cleft dehiscent, not quite reaching the centre. Body somewhat flesh-coloured. L. Q 12 mm. Arctic Ocean; North-Atlantie and North-Sea (West-Norway). Depth 188—376 m. 6. O. amblyops 0. Sars 1890 & 91 O.a., G. ©. Sars, Crust. Norway, v.1 p.65; t.25 f.1 | 1893 Anonyx pectinatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.820. Head, lateral angles quadrate, slightly produced. Side-plate 1 expanded below. Pleon segment 3, postero-lateral angles sligehtly rounded, their hind margin convex, serrate with 14—16 distinet points, 4!" segment with triangular dorsal projeetion ending obtusely. Eyes recurved below, visual elements imperfectly developed, light orange with white reticulation. Antennae as in O.serrata (p.44). Epistome as in O. erispata, much less prominent than in OÖ. pectinata (p.45). Gnathopod 1, 6!" joint considerably longer than 5t%, Uropod 3, inner ramus shorter than basal joint of outer, which carries 3 feathered setae on inner margin. Telson not once and a half as long as broad, with 3 pairs of marginal spinules, cleft gently dehiscent, about reaching the centre. Colour whitish, tinged in front with yellow. L. © 8 mm. North-Atlantie and North-Sea (West-Norway). Depth 188—376 m. Socarnoides 47 27. Gen. Socarnoides Stebb. 1888 Socarnoides (Sp. un.: S. kergueleni), T. Stebbing in: Rep. Voy. Challenger, v.29 p.690 | 1893 S., A. Della Valle in: F, Fl. Neapel, v.20 p.793 | 1890 Socarnioides (laps.), Beddard in: Zool. Rec., v.25 Index p.15. "Body compact, side-plates rather large. Antenna |, peduncle stout, 24 and 34 joints not extremely short, flagellum of few joints. Antenna 2 geniculate, ultimate joint of peduncle shorter than penultimate. Epistome projecting rather beyond upper lip, separated by deep ineision. Lower lip with narrowed lobes and mandibular processes divergent. Mandible narrowly elongate, cutting edge simple, molar weak, palp of moderate length, attached far back. Maxilla 1, inner plate without setae, outer carrying 11 spines, palp with 1° joint very short, 24 large, somewhat tapering, without spines or teeth, but slightly serrate. Maxillipeds, inner and outer plates long, scantily armed, the outer extending far along 34 joint of palp. Gnathopod 1 not subchelate, 7 joint small. Gmathopod 2 minutely chelate. Peraeopods 3—5, 24 joint greatly expanded, especially in peraeopod 5. Uropod 2, shorter than uropod 1, rami subequal, inner with spiniferous constrietion. Uropod 3, shorter than uropod 2, peduncle produced into a dentiform process, rami not long, outer the longer, with small 24 joint. Telson small, narrowing distally, eleft not reaching the centre, dehiscent. 2 species. Synopsis of species: Maxillipeds, outer plates obtusely pointed . . » 2»... 1. S. kergueleni . p. 47 Maxillipeds, outer plates apically rounded . .. » 2... 2. 8. stebbingi . - p.47 1. S. kergueleni Stebb. 1888 8. k., T. Stebbing in: Rep. Voy. Challenger, v.29 p.691 t. 25. ; Head, lateral angles rounded, projecting. Side-plate 1 not distally produced forward. Pleon segment 3, postero-lateral angles rounded. Eyes large, reniform. Antenna 1, flagellum with 8 joints, 1° not very large, accessory flagellum 4-jointed. Antenna 2, geniculate between penultimate and ante- penultimate joint of peduncle, ultimate of peduncle shorter than penultimate, flagellum 7-jointed. Maxillipeds, outer plates large, with apex obtusely pointed, 1 seta on inner margin. Gmnathopod 1, 6tk joint tapering, narrower and slightly longer than 5tk, 7th joint small. Gmathopod 2, 6th joint slender, much shorter than 5%, the thumb shorter than the small finger, thus making a rather imperfect chela. Peraeopods 1—5, 4 joint rather broad. Peraeo- pod 3, 24 joint almost round, scarcely as large as the side-plate. Peraeo- pod 5, 24 joint very large, as long as rest of limb. Uropod 3, inner ramus not much shorter than outer. L. about 7 mm. Southern Indian Ocean (Kerguelen Island). "Depth 54—230 m. 2. S. stebbingi (G.M. Thoms.) 1893 Lysianax® s., G.M. Thomson in: P. R. Soe. Tasmania, 1892 p. 19 t.3 £.9—18; t.5 £.9, 10. d. Closely agreeing with S. kergueleni in most respects, though in a few rather strikingly different. Side-plate 1 large, in figure very large, distally produced forward. Antenna 1, flagellum about 10-jointed, accessory flagellum about 6-jointed. Antenna 2, genieulate between ultimate and penultimate joints 48 Socarnoides, Menigrates of peduncle, flagellum „long and many (30—40) jointed“, (number perhaps varying on the two sides). Maxilla 1 (in figure) single-jointed. Maxillipeds, outer plates large, apically rounded, 2 or 3 minute spines on inner margin below the middle. Uropod 3, inner ramus „short and quite rudimentary*. Telson doubtful. Colour nearly white. Integument very hard and brittle, without any markings. L. 6 mm. — O unknown. Pirates Bay [Tasmania]. In a rock-pool. 28. Gen. Menigrates Boeck 1871 Menigrates (Sp. un.: M. obtusifrons), A. Boeck in: Forh, Selsk. Christian., 1870 p. 113 |] 1891 M., G. ©. Sars, Crust. Norway, v1 p.110 | 1894 M., T. er in: Bijdr. Dierk., v.17 p. 15. Body tumid, dorsally broad, side-plates rather large. Antennae 1 and 2, d and Oo, short, with few-jointed flagella, longer in JS than,in 9. Antenna 1, 24 and 34 joints of peduncle very short, 1° joint in each flagellum rather long. Epistome not distinetly defined from upper lip. Lobes of lower lip narrowly rounded, hind lobes little divergent. Mandible elongate, eutting edge simple, molar weak, palp of moderate length, attached far back. Maxilla 1, inner plate with 2 setae, outer obliquely truncate, carrying 11 spines, palp with 6 spine-teeth on the apex. Maxilla 2, inner plate shorter than outer, obliquely truncate. Maxillipeds, inner plates well armed, outer large, reaching beyond the rather short 24 joint of palp, 4% joint of palp small. Gnathopod 1 not subchelate, 6!" joint longer than 5%, Gnatho- pod 2 elongate, subchelate. Peraeopods 3—5 short and robust, 24 joint greatly expanded, especially in peraeopod 5. Uropod 3 very small, quite unarmed, outer ramus the longer, with small second joint. Telson short and broad, deeply ineised, apices rounded. 1 species. 1. M. obtusifrons (Boeck) 1861 Anonyx o., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.643 | 1871 Menigrates o., A. Boeck in: Forh. Selsk. Christian., 1870 p. 114 | 1872 & 76 M. o., A. Boeck, Skand. Arkt. Amphip., v.1t.6 f.2; v.2 p.169 | 1891 M.o., G.O.Sars, Crust. Norway, v.1 p.l1l t.38 f.1 | 1894 M. o., T. Stebbing in: Bijdr. Dierk., v. 17 p. 15 | 1865 Anonyx brachycercus + A. obtusifrons, W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.6 nr. 1 p.27 t.4 f.42—-49; p.32 | 1893 Ichnopus nugax (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 804. Head, lateral corners somewhat produced and angular. Side-plate 4 little produced backward. Pleon segment 3, postero-lateral angles forming a short acutely upturned process. Eyes reniform, red. Antenna 1, flagellum 8-jointed in Q©, 13-jointed in JS, accessory flagellum 4-jointed. Antenna 2, flagellum 8-jointed in Q, 16-jointed in J; in C the joints of the flagella are broad, with large calceoli. Gmathopod 1 rather powerful, 6% joint much longer than 5th, slightly curved, tapering, 7tk joint strong, curved. Gnathopod 2, 6th joint half length of 5, oblong oval, scarcely dilated distally. Peraeopods 3—5 with 24 and 4tk joints much expanded, the 24 most, the 4tı Jeast in the 5tk pair. Colour pale yellowish with faint reddish tinge in front. L. 13 mm. Arctie Ocean, North-Atlantic and North-Sea (West-Norway). Depth 36—183 m. Aristias ; 49 29. Gen. Aristias Boeck 1871 Aristias (Sp. un.: A. tumidus), A. Boeck in: Forh. Selsk. Christian., 1870 p- 106 | 1890 & 95 A., G. O. Sars, Orust. Norway, © 1 p.47; p.675 | 1893 A., A. Della Valle in: F. Fl. Neapel, .v.20 p. 848. Body short and thick. Side-plates rather small, 1° almost concealed, 4 very slightly excavate. Antenna 1 not very turgid, 24 joint not extremely short, 1° joint of flagellum rather large. Antenna 2 in 9 shorter than antenna 1. Epistome scarcely projecting, defined by a small but distinet sinus. Lower lip, front lobes narrow, hind processes blunt. Mandible strong, eutting edge simple, molar narrow, prominent, acuminate, palp central. Maxilla 1 with 5 or more setae on inner plate, outer plate very broad, palp normal. Maxilla 2 with the plates divergent, inner very broad, outer much narrower. Maxillipeds, inner plates small, outer large, oval, 1°t joint of palp the largest.. Gnathopod 1 rather robust, 6% joint tumid at base, tapering to an apex rather wider than the base of the finger. Gnathopod 2 slender, minutely chelate. Peraeopods 3—5, 22 joint not greatly dilated. Uropod 3, outer ramus the longer, with small 2° joint, Telson rather short, deeply cleft. 5. species. ‘ Synopsis of species: Er 3. inner ramus shorter than 1st joint of 1: BRIAN ee 1. A.tumidus . ... . p.49 | Uropod 3, inner vamus not shorter than 1st joint of outer — 2. o. JıEyes rudimentary 2... 0.2 2% TEL, 2. A.mierops . . . .p.89 = 1. Eyes not rudimentary ——- 3. Velo eLaER 30 Abekbane} u. ee 3. A. commensalis. . p.50 © 4 Telson not cleft to the base — 4. A f Antenna 1, accessory flagellum 5-jointed . . .» . 4. A. neglectus . . . p.50 1 Antenna 1, accessory flagellum 2-jointed ... . . 5. A.megalops . . . p.5l 1. A. tumidus (Kroyer) 1846 Anonyx t., Kreyer in: Naturh. Tidsskr,,. ser. 2 v.2 p.16,40 | 1846 A. t., Kroyer in: Voy. Nord, Crust. t.16 f.2 | 1887 Aristias t., H. J. Hansen in: Vid, Meddel., ser. 4 v.9 p.67 t.2 f.3—3b | 1890 A. t., G. O. Sars, Crust. Norway, v.1'p.49 t.18 f.1 | 1893 A. t., A. Della Valle in: F. Fl. Neapel, v.20 p:846 | 1884 Menigrates arctieus, Orchomene? a., J. S. Schneider in: Tromse Mus. Aarsh., v.7 p-63 t.1, 2. ..... Head, lateral corners bluntly rounded, not projeeting. Pleon segment 3, lateral angles quadrate, margin faintly serrate. Eyes large, constrieted above, black. Antenna 1 in O, flagellum 8-jointed, accessory flagellum 4- or 5-jointed. Antenna 2 in ©, flagellum 7-jointed. Gmnathopod ‘1 rather short and. stout, 6b joint with hind margin serrate, apically forming a minute palm. Peraeo- pods 1—5, 6% joint produced beneath the 7! to a short tooth-like process. Peraeopods 3—5, 4!" joint expanded and decurrent. Uropod 3, outer ramus rather large and dilated, 24 joint small, abruptly närrower, inner ramus little more than half as long as outer. Telson about as broad as long, narrowly «left beyond middle, not to base, with one spinule at each apex. Colour greyish white. L. 8 mm. "Aretie Ocean, Varangerfjord. Depth 110-140 m. 2. A. mierops O.Sars 1895 A. m., G.O.Sars, Crust. Norway, v.1 p.675 t.1£.2. Head, lateral corners not produced, front edges nearly straight. Pleon segment 3, angularly produced at lateral corners (Sars, text, not figure). Eyes quite rudimentary, represented each by a small patch of opaque whitish Das Tierreich. 21.Lief.: T.R. R. Stebbing, Amphipoda 1. 4 50 } Aristias pigment, without visual elements. Antenna 1 in Q, peduncle thick, flagellum not as long as pedunele, 5-jointed, accessory flagellum 2-jointed. Antenna 2, flagellunn much shorter than pedunele, 4-jointed. Gnathopod 1, 5 joint stout, 6% a little longer than 5t%, hind ‘margin serrulate, a small palm. Gnathopod 2, 6*% joint more than half as long as 5", narrowed. distallv. Uropod 3, rami rather short, spiniform 24 joint of outer abruptly narrower than 1° joint, inner ramus mucroniform, a little shorter than outer. Telson short and broad, cleft narrowly nearly to the base, with a spinule at each rounded apex. Body semi-pellueid, yellowish. L. © 3 mm. Trondhjemsfjord, Arctie Ocean (Nordland, very deep water; Tromsö). 3. A. commensalis Bonnier 1896 A. c., J. Bonnier in: Ann. Univ. Lyon, 0.26 p. 614 #.35 f.4. Body thick, compact. Head, lateral eorners slightly produced to obtuse apex. Side-plates not very large; pleon segments 1—3, postero-lateral corners subquadrate. Eyes round, remaining reddish in spirit. Antennae 1 and 2 short, equal. Antenna 1, flagellum with 6 joints, 1° very large, densely elothed, the rest small; accessory flagellum as long as 1° joint of primary, 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle equal, flagellum with 10 joints, 6 calceoli. Epistome carinate. Mandible, palp attached behind the molar. Maxillipeds, inner plates forming a little double erest, outer large, palp small, 1°t joint broad, finger very short. Gnathopod 1, 5t% joint as long as 6th, 6th tapering, hind margin crenulate, finger small. Gnathopod 2, 5tk joint twice 6'%, 6th with the minute finger forming a tiny chela. Peraeopods 1—5 tolerably stout. Peraeopods 3—5, 24 joint expanded, hind margin serrate. Uropod 1 spinose; uropod 3, inner ramus broad, with 3 spinules on distal part of outer margin, outer ramus longer, serrate on inner margin, with small 24 joint. Telson eleft to the base, with 1 or 2 pairs of marginal spines and 2 or 3 on the obtuse apices. L. S 10 mm. Bay of Biscay. Depth 800 and 960 m. On Pheronema grayi S. Kent, and Pteraster personatus P. Sladen. 4. A. neglectus H. J. Hansen 1859 Anonyx tumidus (err., non Kroyer 1846!), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.ö nr.1 p.41 | 1867 A. t., Cam. Heller in: Denk. Ak. Wien, 0.2611 p.25 t.3 f.6—12 | 1871 Aristias t., A. Boeck in: Forh. Selsk. Christian., 1870 p.107 | 1872 A. t., A. Boeck, Skand. Arkt. Amphip., v.1 p. 148 t.3 f.4 | ?1861 Lysianassa ciliata, E. Grube, Ausfl. Triest, p.135 | 1887 Aristias neglectus, H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.67 | 1893 A.n., A. Della Valle in: F. Fl. Neapel, v.20 p. 844 t.6 f£.9; 1.26 f. 16—31 | 1895 A. n., G. O. Sars, Crust. Norway, ».1 p-675 | 1890 A. audouinianus (err., non Lysianassa audowiniana Bate 1856!), G. O. Sars. Crust. Norway, v.1 p.48 t.17 £.2. Head, with lateral corners almost reetangular and slightly produced. Pleon segment 3, lateral angles narrowly rounded, margin smooth. Eyes rounded oval, black with a whitish eoating. Antenna lin O , flagellum 10-jointed, accessory flagellum 5-jointed. Antenna 2 in Q, flagellum 9-jointed. Gnatho- pod 1, 6tk joint fully as long as 5tk, hind margin finely serrate, apically scarcely forming a palm. Gmathopod 2 long and slender, 6% joint about half length of 5th, Peraeopods 1-5, 6th joint produced to a short tooth-like process. Peraeopods 3—5, 4! joint” very little expanded. Uropod 3, outer ramus little longer or broader than inner. Telson longer than broad, eleft beyond middle, not to base, with rather wide ineision, 3 spinules at each apex. Colour corneous yellow, ovaries dark: bluish. L. 8 mm. Aretic Ocean, North-Atlantie, North-Sea, Skagerrak and Kattegat (South- and West-Scandinavia, Shetland Islands); Mediterranean. v Aristias, Ambasia ; öl 5. A. megalops 0. Sars 1895 A. m., G. O. Sars, Crust. Norway, v.1 p.676 t.II £.1. Head, with lateral corners slightly produced. Pleon segment 3, lateral corners acutely produced. Eyes very large, oblong oval, visual elements imperfeetly developed, pigment light reddish brown. Antenna 1 in Cd, peduncle 4 rather long, flagellum 4-jointed, scarcely as long as peduncle, accessory 3 flagellum 2-jointed. Antenna 2 in S, flagellum 4-jointed, half as long as Ei peduncle. Gnathopods 1 and 2 and peraeopods 1I—5 nearly as in A. microps — (p. 49). Uropod 3, outer ramus eonsiderably longer than inner. Telson as in ‚A. microps, but apices more truncate. Colour light yellowish. L. d 3 mm. = Perhaps the $ of A. mierops (p. 49). Trondhjemsfjord. Depth 565—753 m. 30. Gen. Ambasia Boeck 1871 Ambasia (Sp. un.: A. danielssenit), A. Boeck in: Forh. Selsk. Christian., FE 1870 p. 97 | 1890 A., G. O. Sars, Crust. Norway, v.1 p.45 | 1893 A., A. Della Valle in: 2 F. Fl. Neapel, v.20 p. 805. Side-plate 1 partly concealed, 3 following large and deep. Antenna 1, 1st joint tumid, 24 and 34 very short, flagellum with 1° joint very long, accessory flagellum subequal to peduncle in length. Antenna 2 in © scarcely longer than antenna 1. Epistome projeeting in front of upper lip as a large 3 angular plate. Lower lip, mandibular processes narrow, divergent. Mandible strong, eutting edge broad, molar evanescent, palp behind the centre. Maxilla 1 with 2 setae on inner plate, a small number of spines on outer, palp normal. Maxilla 2, plates nearly equal, apically spined. Maxillipeds, inner plates normal, outer large, elliptical, almost reaching end of palp, in which the 4tk joint is rudimentary. Gnathopod 1 slender, 6% joint shorter than 5t", tapering, not subchelate, finger small. Gnathopod 2 very slender, 6% joint about half 2 length of 5t", long oval. Peraeopods 1—5, 7! joint very small. Peraeopods 3—5, 24 joint well expanded. Uropod 3 rather short, outer ramus with y small 24 joint. Telson of moderate size, rather tapering, deeply_cleft. 2 species. Synopsis of species: Uropod 3 with very unequal rami.. .. 2». .2... 1. A. danielssenii . . p.5l Timonod 8 with eauab rami ...... 00, en. 2. A.pulchra . . . . p.52 1. A. danielssenii Boeck 1871 A. d., A. Boeck in: Forh. Selsk. Christian., 1870 p.97 | 1872 A. d., A. Boeck, Skand. Arkt. Amphip., v.1 p.121 t.3 £.6 | 1890 A. danielsseni, G. O. Sars, Crust. Norway, v.1 p.46 t.17 £.1 | 1893 A.d., A. Della Valle.in: F. Fl. Neapel, v.20 p. 805. Oo. Head, with lateral corners produced, almost quadrate. Pleon segment 3, postero-lateral angles ending in small upturned tooth, "above which the margin is broadly rounded; segment 4 with high compressed triangular expansion dorsally. Eyes narrow, deep, subsigmoid, visual elements imperfect, pigment a beautiful red. Antenna 1 in Q , flagellum 7-jointed, accessory flagellum 5-jointed, scarcely longer than 1° joint of primary. Antenna 2 in ©, ultimate joint of peduncle shorter than penultimate, flagellum 5-jointed. Gnathopod 1, 24 joint f rather dilated, shorter than rest of limb. Gnathopod 2 subchelate, tending to chelate. Uropod 3, inner ramus much the shorter. Colour dark purplish red in transverse bands of pigment spots. L. 13 mm. — | not known. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway). 4* 52 Ambasia, Ichnopus 2. A. pulchra (H.J. Hansen) 1887 Tryphosa p., H.J. Hansen in: Vid. Meddel., ser.4 2.9 p.78 t.2 f.6—-6e | 1895 Ichnopus nugax (part.), A. Della Valle in: F. Fl. Neapel, 2.20 p. 804. Head, lateral angles little produced, almost quadrate. Pleon segment 3 as in A. danielssenii, segment 4 not carinate. Eyes subreniform, very deep, rather narrow, yellowish (red in life). Antenna 1, flagellum with many joints, accessory flagellum with 8 joints. Antenna 2, ultimate joint of pedunele longer than penultimate, flagellum with many joints. Both antennae in C have the flagella more elongate than in 9; that of antenna 2 is very long. Upper hip (epistome?) with prominent, upturned, bluntly pointed process. Mouth- organs not described. Gnathopod 1, 24 joint not much dilated. Gnathopod 2 subchelate. Peraeopods, 4 joint Tittle expanded. Uropod 3, rami equal in length. L. 15 mm. Arctie Ocean and North-Atlantie (West-Greenland). Depth 28.188 m. 31. Gen. Ichnopus A. Costa 1853 Ichnopus (Sp. un.: I. taurus), A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p. 169 | 1857 I., A. Costa in: Mem. Acc. Napoli, v.1 p.188 | 1890 I., G. O. Sars, Crust. Norway, v.1 p.39 | 1893 I. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 800. Body rather slender and compressed. Flagella of antennae 1 and 2 with numerous brancnjaj Hort Joints, those of antenna 2 elongate in vesie adult S. Upper lip slightly projecting above, a small ineision between it and the epistome. Lower lip with narrow front lobes, the mandibular processes slender, very divergent. ‘Mandible, eutting edge broad, simple, molar weak, palp large, central. Maxilla 1, inner plate small, outer broad, obliquely truncate, spines strong, palp normal. Maxilla 2, plates rather narrow. Maxillipeds normal, outer plates large, broadly rounded. Gnathopod 1 rather thin, not subchelate, 7% joint armed on concave margin with dense bunch of spinules. halopod ea 1}... „ Gmathopod. 2 elongate, subchelate (Fig. 10). Peraeopods 3—-5 successively longer. Bran- ehial : vesieles large, hipinnase with accessory lobes. Uropod 3,. rami rather large, lanceoläte, "outer 2-jointed. Telson deeply cleft. 2 species. 6 joint Synopsis of species: Gnathopod 1, finger not expanded at base... ...... 1. L spinicornis . p.52 Gnathopod 1, finger expanded at base - ...2.... 2. Ltaurus. . . .:p.53 1. L. spinicornis Boeck 1861 TI. s., A. Boeck in: Forh. Skand. Naturf., Mode 8 p-645 | 1890 I. s., G.O. Sars, Crust. Norway, o©.1 p.40 t.15 | 1865 Lysianassa s., W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.6 nr.1 p.20 | 1866 Ichnopus calceolatus, Cam. Heller in: Denk. Ak. Wien, v.2611 p.20 t.2 f. 26—28 | 1871 I. minutus, A. Boeck in: Forh. Selsk. Christian., 1870 p.99 | 1872 I. spinicornis + I. m., A. Boeck, Skand, Arkt. Amphip., ®.1 p.124 t.2 f.3; p.126 t.3 f.7 | 1893 I. taurus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 801. Head, lateral corners somewhat projeeting and angular. Back rounded. Side-plates not very deep. Pleon segment-1 produced below in front we I 5 WERDE Khan 2 en U hd Ze En iin zn a a DE Fr re gi Li a a u 0 Ichnopus, Anonyx 53 into a short tooth, segment 3 with the hind corners toothed and upturned, and the margin above bowed out. Eyes 'reniform, larger in Ö, deep red. Antenna 1 in O0, about '/, length of body, longer in So, 1% joint "stout, with short but conspieuous dentiform process, 24 and 34 joints very short, flagellum in d with more than 60 Joints, none very large, accessory flagellum 10-jointed. Antenna 2, in 9 a little, in‘C much, longer than antenna 1, ultimate joint of peduncle scarcely shorter than penultimate. Both pairs of antennae in both sexes have numerous calceoli. Gmathopod 1, 6 joint slender, tapering, narrower but not much shorter than 5th, finger evenly curved, with bunch of delicate spinules on inner side of base (Sars), subapically strongly curved, and below armed with 6 or 7 pointed spinules (Heller). Gnathopod 2 nearly twice as long as gnathopod 1, 6!" joint oval, half as long as 5t*, not apically produced, finger minute on the centre of the hand’s apex (Fig. 10). Peraeo- pod 5 nearly twice as long as peraeopod 3. Uropod 2, the rami unequal, the inner the shorter, with a constrietion in which a spine is planted. Uropod 3, rami much longer than peduncle, outer the longer, with distinet terminal joint. Telson twice as long as broad, cleft beyond the middle, a spinule at each apex. Colour light greenish, a erimson tinge at each extremity. L. 12—17 mm. Arctic Ocean, North-Atiantie and North-Sea (West-Norway); Mediterranean; ‚Java Sea (lat. 3° S., long. 107° E.). 2. I. taurus A. Costa 1853 1. t., A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.172 | 1857 1. t., A. Costa in: Mem. Ace. Napoli, v.1 p.189 t.1 £.3 | 1893 It. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.801 t.3 £.1; t.27 £ 1-22 | 1866 Lysianassa longieornis (part.: Q, non Z!), E. Grube in: Arch. Natner: v.321 p. 396 t.9 f.8 | 1866 Ichnopus affinis, Cam. Heller in: Denk. Ak. Wien, 2.2611 p.19 t.2 f.19--25 ı 1895 T. a., I. taurus?, Chevreux in: Mem. Soe. zool. France, v.8 p. 425. Distinguished from I. spinieornis by not having calceoli (so far as appears) on the antennae of O0. Antenna 1, 1° joint or 1° and 24 joints, especially in C, usually with a little tooth; accessory flagellum 7-jointed. Finger of gnathopod 1 strongly curved (at least at the tip), carrying at the expanded base spines of variable size. Colour grey green, sprinkled with many red spots (Della Valle). L. 10—12 mm. Gulf of Naples, Adriatie, North-Atlantie flat. 47° N., long. 8° W., depth 2620 m). 32. Gen. Anonyx Kröyer 1838 Anonysx (part.), Kröyer in: Danske Selsk. Afh., v.7 p- 242 „1871 A., A. Boeck in: Forh. Selsk. Kar „ 1870 p. 107 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.607 | 1891 A., G. O. Sars, Crust. Norway, v.1 p.87 | 1893 A. (part.), A. Della Valle in: F. Fl. Neapal: v.20 p.810 | 1894 A., T. Stebbing in: Bijdr. Dierk., 0.17 p.7. Side-plate 1 expanded below. Pleon segment. 3, postero-lateral angles upturned. Antenna 1, accessory flagellum well developed. Antennae 1 and 2 inc with large calceoli. Epistome not projeeting. Upper lip produced in front to a compressed linguiform lobe. Mandible powerful, with one or two teeth at angle of cutting edge, molar prominent, conically produced and eiliated, palp set far forward. Maxilla 1, inner plate with 2 setae, outer broad, obliquely truncate, carrying 11 spimes, apex of palp having 5—10 spine-teeth. Maxilla 2, inner plate much smaller than outer. Maxillipeds, outer plates broadly oval, not (or not always?) reaching end of. 24 joint of palp, which is "robust. Gnathopod 1 short and stout, distinetly sub- chelate, palm nearly transverse, finger short and without prominent secondary 54 Anonyx tooth. Gmathopod 2, 6!" joint oval, its apex slightly produced beneath the minute finger. Peraeopods rather long, 24 joint large in peraeopods 3—5. Branchial vesicles transversely folded on both sides. Uropod 3 projecting beyond the preceding pair, rami lanceolate, with spinules and setae on the margins. Telson deeply cleft, with a pair of apical spinules. 5 species. Synopsis of species: j Eyes greatly dilated below — 2. \ Eyes not greatly dilated below — 3. j Gnathopod 1, 6th joint not longer than 5th... . 1. A.nugax. .... p- 54 Gnathopod 1, 6th joint longer than 5th .... 2. A.lagena..... p. 54 pP h g Antenna 1, flagellum and accessory flagellum sub- : 3 | 3 Eee SE en 9. A: aflinis .... p- 55 | Antenna 1,_ flagellum and accessory flagellum ; unequal — 4. 4 f Side-plate 1 scarcely widened below... .. . . . 4. A. lilljeborgii. . . p.55 \ Side-plate 1 much widened below .. .... - 5. A. ampulloides . . p.55 1. A. nugax (Phipps) .1774 Cancer n., Phipps, Voy. North Pole, p.192 t. 12 f.2 | 1781 Gammarus n., J. C. Fabrieius, Spec. Ins., v.1 p. 516 | 1826 Talitrus n., J. C. Ross. in: W. E. Parry, J. third Voy., App. p.119 | 1829 Gammarus n., Atylus (part.)?, Latreille in: G. Cuvier, Rögne an., n.ed. v.4 p.120 | 1877 Anonyx n., Miers in: Ann. nat. Hist., ser.4 v.19 p.135 | 1891 & 95 A.n. (part.), G. O. Sars, Crust. Norway, v.1 p.88, 686 | 1893 A.n. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.834 | 1894 A.n., T. Stebbing in: Bijdr. Dierk., ©.17 p.7 | 1845 & 46 A. ampulla (part.), Kreyer in: Naturh. Tidsskr., ser.2 v.1 p.578; v.2 p.43 | 1862 A. lagena (err., non Kröyer 18381), Bate, Cat. Amphip, Brit. Mus., p. 77 t.12 £.7 | 1866 Lysianassa l., Goes in: Öfr. Ak. Förh., v.22 p.518. a Head, lateral angles little produced, slightly rounded. Side-plate 1 widened below. Pleon segment 3, postero-lateral angles with upturned process acute, not long, segment 4 slightly carinate. Eyes flask-shaped, greatly widened below, very dark. Antenna 1, 1° joint not much longer than broad, flattened on inner side, sometimes also ridged on the outer side, flagellum in © of 23, in C of 34 joints, 1° not very elongate, accessory flagellum with 10 joints, 1 the longest. Antenna 2, ultimate joint of pedunele a little shorter than penultimate, flagellum in 9 reaching 40, iu S 60 joints. Gnathopod 1. 6th joint equal in length to 5t", Gmathopod 2, 6% joint oval, rather more than half length of 5%. Uropod 2, inner ramus constrieted. Uropod 3, rami broad and flat, inner almost as long as outer, of which the 24 joint is small. Telson oblong, breadth two thirds of the length, very deeply cleft, 2 or 3 pairs of marginal spinules and a pair on the obtuse apices. Colour light rose-red on the back, nearly white on the sides (Kroyer), light claret-red (Sars). L. reaching 45 mm or more. Arctic Ocean, to lat. 83° 19 N. Depth 18—1184 m. 2. A. lagena Kröyer 1838 Lysianassa l., A. I, (Reinhardt in MS.) + L. appen- diculosa, A. appendiculosus. Kröyer in: Danske Selsk. Afh., ©.7 p. 237, 244 t.1 f.1; p. 240, 244 t.1 f.2 | 1838 A.1.—+ A. appendiculosus, Kröyer in: Naturh. Tidsskr., v.2 p- 256, 257|1840 Lysianassa I. + L. appendiculata, H. Milne Edwards, Hist. nat. Crust., v.3 p.21 ! 1855 Lyeianassa l., T. Bell in: Belcher, Last arct. Voy., v.2 p.406 | 1871 Anony& l., A. Boeck in: Forh. Selsk. Christian., 1870 p. 108 | 1889 A. kükenthali, Vosseler in: Arch. Naturg., 0.551 p.154 t.8 f.1—17 | 1891 & 95 4A. nugax (parf.), A. lagena, G. O. Sars, Crust. Norway, v©.1 p.88 t.31; p. 686. ku EU ST nn d 4 IR NEE I ET = Anonyx 2 55 In general elosely resembling A. nugax. Antenna 1 in ©, flagellum R 15-jointed, accessory flagellum 8-jointed. Antenna 2, flagellum in Q 23-jointed. Br. Gnathopod 1, 6 joint longer than 5%, Uropod 3, inner ramus longer than basal joint of outer. Colour whitish, with transverse yellowish band on each segment. L. © 18 mm. Arctic Ocean; North-Atlantie, North-Sea, Skagerrak and Kattegat (Scandinavia, North Britain). Depth 38—565 m. 3. A. affinis Ohlin 1895 A.a. (non A. Della Valle 1893), Ohlin in: Acta Univ. Lund., ©.31 nr.6 p.24 t. f.15—18 | 1895 A. a., A. kükenthali var.?, Ohlin in: Zool. Anz., v.18 p. 486. ©. Head, lateral angles a little produced, rounded. Pleon Besen 3, postero-lateral angles produced into short sharp process, segment 4 carinate. Eyes very large, oblong, dark. Antennae 1 and 2 short, subequal. Antenna 1, flagellum 6-, accessory flagellum 5- or 6-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 6- or 7-jointed. Palp of mandible = affıxed over molar. Gnathopod 1 as in A. lilljeborgii, but palm (in figure) more > oblique. Gnathopod 2, 5!" joint narrower than 3% and little longer, 6! joint 3 distally truncate. Telson twice as long as broad, cleft nearly to the base. Uropod 3, inner ramus two thirds length of outer, with 3 long setae on inner margin. L. 13 mm. — JG unknown. Baffın Bay (Cape Dudley Digges). Depth 32—47 m. 4. A. lilljeborgii Boeck 1871 A.1., A. Boeck in: Forh. Selsk. Christian., 1870 p.109 | 1872 A. l., A..Boeck, Skand. Arkt. Amphip., v.1 p.154 t.4 f.3 | 1891 A. 1, G. O. Sars, Crust. Norway, v.1 p.90 t.32 f.1| 1894 A.L., T. Stebbing in: Bijdr. Dierk., v.17 p.8 | 1893 A. nugax (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 834. In general closely resembling A.lagena. Head, lateral angles a little more produced and narrowly rounded. Side-plate 1 of nearly uniform width. Pleon segment 3, postero-lateral angles not very acute. Eyes not greatly dilated below, brownish red. Antenna 1 in O, flagellum 14-, accessory flagellum 6-jointed. Antenna 2 in O, flagellum 15-jointed. Gnathopod 1 not very robust. 6th joint equal in length to 5%, rather tapering. Gnathopod 2 very slender, 6!" joint narrower and more distinetly produced beneath the finger than in A. lagena. Peraeopods 1 and 2, an obtuse spine at end of 6% joint more con- spieuous than in the larger species. Uropod 3, rami narrower. Telson rather longer in proportion to breadth. L. Oo 11 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (West-Norway). Depth 113—132 m. 5. A. ampulloides Bate 1862 .A.a., Bate, Cat. Amphip. Brit. Mus., p.78 t.12 f£.8 | 1888 A.a., T. Stebbing in: Rep. Voy. Challenger, ©.29 p.608 t.3 | 1891 A. a., G. 0. Sars, Crust. Norway, v.1 p.88 | 1893 A: nugax (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 834. e Head, lateral angles secarcely produced, rounded. Side-plate 1 considerablv widened below. Pleon segments 1—4 subcarinate, segment 3 with postero- lateral angles much upturned but little produced. Eyes large, reniform, nearly: meeting at top ofhead. Antenna 1, accessory flagellum with 7 or 8 joints, 1° elongate. Antenna 2, ultimate joint of pedunele considerably shorter than penultimate. Gnathopod 1, 6!" joint narrower than 5t" and barely as long, scarcely narrowed distally. Gnathopod 2, 6! joint more than half length of 5%, narrow, palm slightly excavate, finger not extremely minute. Peraeo- pod 1, 6% joint having on hind margin a minute hooked spine close to hinge of finger. Uropod 2, inner ramus constrieted. Uropod 3, rami lanceolate, bi ie un RT, N bl Ze eh Ce, 56 Anonyx, Socarnes subequal, outer with small 24 joint. Telson nearly twice as long as broad, cleft three quarters of length, rather dehiseent. L. about 13 mm. N orth-Paeifie (Japan). Depth 1419 m. 33. Gen. Socarnes Boeck 1838 Anonys (part.), Kröyer in: Danske Selsk. Afh., «.7 p.242 | 1847 Ephippiphora (Sp. un.: E. kroyeri) (non Duponchel 1834, Lepidoptera!), A. White in: P. zöol. Soe. London, ».15 p.124 | 1871 Socarnes (Sp. un.: 8. vahli), A. Boeck in: Forh. Selsk. Christian., 1870 p.99 | 1872 S., A. Boeck, Skand. Arkt. Amphip., «.1 p.128 ! 1890 S., G. 0. Sars, Crust. Norway, v.1 p.43 | 1893.8., J. Bonnier in: Bull. sei. France Belgique, v.24 p. 188. Body dorsally broad, laterally compressed. Side-plates rather large. Antenna 1, joints of flagellum not numerous; antenna 2 short in Q. Upper lip separated by rather deep incision from epistome and prominent beyond it. Mandibular processes of lower lip not very divergent. Mandible, cutting edge simple, molar very weak, palp attached behind it. Maxilla 1 normal. Maxilla 2 with inner plate obliquely truncate. Maxillipeds normal, inner plates obliquely truncate, outer rounded, 7% joint small normal. Gnathopod 1 not subchelate. Gnathopod 2 elongate, subchelate. Peraeopods 3-—-5 successively longer. Branchial vesieles with accessory lobes on one side only. Uropod 3, rami of moderate size, outer 2-jointed. Telson deeply eleft. 3 species accepted, 1 obscure. Synopsis of accepted species: Pleon segment 3 with central triangular pro- 1 jeetion of postero-lateral margins . . . . 1. S, bidentieulatus.. . . p.56 Pleon segment 3 without triangular pro- jection — 2. Antenna 1, accessory flagellum with more than | FIRE a en a een 2: van... 2.05% p. 57 2 | Antenna 1, accessory flagellum with not more TE a. VE ee 3. S. erythrophthalmus . p.57 1. S. bidenticulatus (Bate) 1835 Gammarus nugax (err., non Cancer n. Phipps 1774!), J.C. Ross in: John Ross, App. sec. Voy., nat. Hist. p.87 | 1862 Lysianassa n., Bate, Cat. Amphip. Brit. Mus., p.65 t. 10 f.3 | 1858 L. bidenticulata, Bate in: Ann. nat. Hist., ser.8 v.1 p.362 | 1877 Anonyx bidenticulatus, Miers in: Ann. nat. Hist., ser.4 ».19 p.136 | 1885 & 86 Socarnes b., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p-139, 276 t.12 £.1; Crust. II p.38 | 1894 S$.b., T. Stebbing in: Bijdr. Dierk., v.17 p.3| 1893 Tchnopus b., A. Della Valle in: F. Fl. Neapel, v.20 p. 804 | 1866 Lysianassa vahli (part.), Goes in: Öfv. Ak. Förh., v.22 p.518 | 1871 Socarnes v. (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.100 | 1882 S. ovalis, Hoek in: Niederl. Arch. Zool., suppl. I nr.7 p.42 t.3 f. 29—29r. Body deep and tumid. Head with lateral angles acute. Side-plates deep. Pleon segment 3 with postero-lateral margins showing 2 triangular projections, of which the upper is larger, the lower small and sometimes evanescent. Eyes narrow, reniform or sublinear, darkbrown. Antenna’ 1, peduncle short and thick, 1° joint large, 24 and 34 very short, flagellum of about 18 joints, the 1° not very large, accessory flagellum 9-jointed, more than half as long as primary. Antenna 2 in O more slender and scarcely longer than antenna 1, flagellum 17-jointed. Gnathopod 1, 6% joint tapering, Socarnes 57 about as long as the 5th, 7tlı small. Gmathopod 2, 6% joint shorter than 5th, not forming a chela but produced to angular corner beneath the finger. Peraeopods 3—5, 24 joint broadly 'expanded, almost eircular. Uropod 3 scarcely reaching beyond uropod 2, rami shortly lanceolate. Telson triangular, cleft to the middle. L. attaining 36 mm. Aretie Ocean. 2. S. vahlii (Kröyer) 1838 Lysianassa v., Anony& v., (Reinhardt in MS.) Kröyer in: Danske Selsk. Afh., v.7 p.233, 244 | 1871 Socarnes vahli (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.100 | 1890 8. v., G. O. Sars, Crust. Norway, v.1 p.44 t.16 f.2 | 1894 S. vahlii, T. Stebbing in: Bijdr. Dierk., ».17 p.3 | 1888 Ephippiphora v., 8. (part.), T.Stebbing in: Rep. Voy. Challenger, v.29 p. 177, 1698 | 1893 Ichnopus nugax (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 804. Back broadly rounded. Head, lateral angles narrowly rounded. Side- plates rather deep. Pleon segment 3 broadly rounded at the postero-lateral corners. Eyes reniform, black. Antenna 1, 24 joint of peduncle not extremely short, flagellum with 12 joints, the 1°t rather small, accessory flagellum 7-jointed, half length of primary. Antenna 2 in 9 scarcely longer than antenna 1, in 9 longer than the body. Gmathopod 1, 6!" joint narrower than 5tt and not longer, tapering, 7% small. Gnathopod 2 elongate, 6% joint half length of 5th, roundly expanded below the finger. Uropod 3, inner ramus considerahly shorter than outer. Telson eleft beyond the middle, subequal in length to pedunele of uropod 3, the lobes narrowly rounded apically, a spinule at each apex. Colour whitish, with broad transverse bands of beautiful erimson spots. L. 14 mm. Arctie Ocean and North-Atlantie (West-Norway, chiefiy to the north). 3. S. erythrophthalmus D. Roberts. 1892 S. e, D. Robertson in: P. nat. Hist. Soe. Glasgow, n. ser. v.3 p.200 | 1893 S. e., J. Bonnier in: Bull. sei. France Belgique, v.24 p.183 t. 6. Head with lateral angles rather sharply advanced, the margin above slightly serrate. Pleon segment 3 with postero-lateral angles rounded. Eyes oval, red, fading in spirit. Antenna 1, peduncle robust, flagellum of 8—13 joints, 1° scarcely larger than 24; 24, 34 and 4! in J with calceoli; accessory flagellum with 4 slender joints. Antenna 2, a little longer than antenna 1, ultimate joint of peduncle shorter than penultimate, flagellum 6—10-jointed. Gmathopod 1 as in S. vahlii. Gnathopod 2, 6tk joint: half length of 5t", rather squared below the 7!" joint. "Uropod 3 as in S. vahlii. Telson rather longer than peduncle of_uropod 3, cleft to the centre, with a spinule at each narrow apex. Colour pellueid with slight greenish tint. "The eggs few and large, when ripe golden yellow. L. 3—4 mm. Firth of Clyde, surface to 26 m; Pas de Calais (Cape Gris-Nez, depth 50 m). '8.kroyeri (A. White) 1847 Ephippiphora k., A. White in: P. zool. Soc. London, v.15 p.124 | 1884 E. kröyeri, Miers in: Rep. Voy. Alert, p.312 | 1888 E. kroyeri, Socarnes (part.), T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 555, 1698 | 1862 Lysianassa k., L. kröyeri, Bate, Cat. Amphip. Brit. Mus., p.65 t. 10 f.4 | 1872 Socarnes? kröyeri, A. Boeck, Skand. Arkt. Amphip., v.1 p. 128. L. 25 mm. Indian Ocean and South-Paeific (Tasmania, Dundas Straits, Prince of Wales Channel, Port Denison). 58 Hippomedon 34. Gen. Hippomedon Boeck 1871 Hippomedon (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.102|1872 H., A.Boeck, Skand. Arkt. Amphip., v.1 p.135 | 1890 H., G.O. Sars, Crust. Norway, v.1 p.55 | 1893 H., J. Bonnier in: Bull. sci. France Belgique, v.24 p.174 | 1893 H., A. Della Valle in: F. Fl. Neapel, v.20 p.807 | 1894 H., T. Stebbing in: Bijdr. Dierk., v.17 p.4 | 1888 Platamon (Sp. un.: P.longimanus), T.Stebbing in: Rep. Voy. Challenger, 0.29 p.642. Side-plates rather narrow. Pleon segment 3, postero-lateral angles sharply upturned. Eyes imperfectly developed. Antenna 1, flagellum not large, 1° joint very large, accessory flagellum small. Antenna 2 much longer than antenna 1, flagellum many-jointed; flagellum of antennae 1 and 2 with calceoli in.J. Epistome not projeeting. Mandible short and strong, molar prominent, powerful, palp elongate, affixed in front of molar. Maxilla 1, inner plate short, with 2 setae, outer with the usual spines, palp expanded distally, earrying numerous spine-teeth. Maxilla 2, plates rather short and broad, the inner fringed on inner margin. Maxillipeds, outer plates fringed with spine-teeth on straight inner margin, generally reaching much beyond 24 joint of the robust palp. Gmnathopod 1 slender, 5 joint long, 6!" oblong ovate, with ill-defined palm, finger slender. Gnathopod 2 subchelate. Peraeo- pods slender, except 24 joint of pairs 3—5. Branchial vesicles of peraeo- pods 3 and 4 somewhat complex, a small one on peraeopod 5. Uropod 3, rami long, subequal, with marginal spinules, generally without conspicuous setae, the outer 2-jointed. Telson oblong, eleft deep, dehiscent, with 1 pair of apieal spinules. 6 species. Synopsis of species: j Eyes with one eonspieuous lens apiece.. . - . . 1. H.holböli ... ... p.58 - | Eyes without lenses — 2. | Pleon segment 3, lateral processes defined by a 2 Kobalt 2. H. denticulatus . . p.59 3 j Gnathopod 1, palm confluent with hind margin — 4. \ Gnatliopod 1, palm not eonfluent . . ..... 6. H. geelongi. . . . p.60 Pleon. segment 3, lateral processes acutely pro- A | IONDaB Re, re ee a 3. H. propingvus . . p.59 | Pleon segment 3, lateral processes rather short and blunt — 5. f Cleft of telson scarcely dehiscent ... ... .. 4. H. robustus. . . . p.59 | 5 | Cleft of telson strongly dehiscent .. .»..... 5. H.longimanus . . p.60 1. H. holbölli (Kroyer) 1846 Anonyx h., Kroyer in: Naturh. Tidsskr., ser. 2 v.2 p.8,38 | 1846 A. h., Kroyer in: Voy. Nord, Crust. t.15 f.1a—s | 1866 Lysianassa h., Goös in: Öfv. Ak. Förh., v.22 p.520 | 1885 Hippomedon h. var., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.142 t.12 f£.2 | 1887, H. h., H. J. Hansen in: Vid. Meddel., ser. 4 ©.9 p.63 t.2 f.1—1b | 1890 H. h., H. holbelli, G. O. Sars, Orust. Norway, v.1l p-58 t.21 f.2 | 1893 H. holbölli (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 808. Head, lateral angles not produced. Side-plate 1 scarcely widened below. Pleon segment 3, postero-lateral angles moderately upturned, acute, segment 4 with conspicuous carina. Body above and partly on the side very finely reticulate with longitudinal striae, side-plates and sides of pleon finely granu- late. Eyes at lateral angles of head, with a conspicuous watchglass-shaped lens. Antenna 1, joints of pedunele not produced, flagellum 12-jointed, accessory flagellum 4-jointed. Antenna 2, ultimate joint of peduncle little longer sein en u m u ne Kia an 5 a er EEE IRIREN Hippomedon 59 than penultimate. Peraeopods, 7tk joint elongate. Uropod 3, 24 joint of outer ramus rather long. Telson not twice as long as broad, eleft extending ®/, of the length, dehiscent. L. 11—16 mm. Arcetie Ocean. 2. H. denticulatus (Bate) 1857 Anonyx d., Bate in: Ann. nat. Hist., ser. 2 v.19 p.139 | 1861 A. d., Bate & Westwood, Brit. sess. Crust., v.1 p.101 f. | 1887 Hippo- medon d., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.65 t.2 f.2—2b | 1890 H.d., G. ©. Sars, Crust. Norway, v.1 p.56 t.20 | 1893 H.d. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.808 t.29 f£.33—42 | 1871 H. holbolli (err., non Anony« holbölli Kroyer 1846!), A. Boeck in: Forh. Selsk. Christian., 1870 p. 102 | 1872 H. h., H. holbölli, A. Boeck, Skand. Arkt. Amphip., v.1 p. 136 u: 8; 66 87. Head, lateral angles slight produced, acute. Side-plate 1 widened 'below, covering the mouth-organs. Pleon segment 3, postero-lateral angles strongly upturned, unique in having a notch separating the acute process from the hind margin, segment 4 without carina.. Body smooth, slightly punctate. Eyes linear, slightly widened below, without lenses, light red, transversely striped with opaque white. Antenna 1, joints 1 and 2 bluntly produced, flagellum in © 11-jointed, in d much longer, accessory flagellum 3-jointed. Antenna 2in O more than twice aslong as antenna 1, in C as long as the body, ultimate joint of peduncle nearly twice penultimate. Gnathopod l, 6int half as long as 5%, palm finely denticulate. Peraeopods, 7'h joint scarcely more than half as long as 6. Uropod 3, 24 joint of outer ramus very small. Telson nearly twice as long as broad, cleft extending beyond the middle, distally dehiscent, with one pair of marginal spinules. Body whitish, pellueid, with some transverse orange bands. L. Q 14, 9 11 mm. North-Atlantie, North-Sea, Skagerrak and Kattegat (Bohuslän, Denmark, Great Britain, France); Mediterranean. 3. H. propingvus 0. Sars 1859 Anonyx holbölli (err.. non Kreyer 1846!), R. M. Bruzelius in: Svenska Ak. Handl., n.ser. v.3 nr. 1 p.43 | 1890 Hippomedon pro- pingvus, &. O. Sars, Crust. Norway, v.1 p.57 t.21 f.1 | 1893 H. propinquus, A. Della Valle in: F. Fl. Neapel, v.20 p.810 | 1894 H. squamosus, T. Stebbing in: Bijdr. Dierk., v.17 p.4 t.1. Head, lateral angles narrowly rounded. Side-plate 1 scarcely widened below. Pleon segment 3, postero-lateral angles strongly upturned, acute process without defining notch, segment 4 slightly produced dorsally. Integument very finely and irregularly reticulated. Eyes as in H. denti- culatus. Antenna 1, joints 1 and 2 little produced, 1° joint of flagellum very elongate, accessory flagellum slender, 3-jointed. Antenna 2, ultimate joint of peduncle little longer than penultimate. Gnathopod 1 more slender than in H. denticulatus. Peraeopods 1 and 2, 7" joint nearly as long as 6#", with cap over the apex. Uropod 3, 24 joint of outer ramus rather large. Telson more than twice as long as broad, cleft extending much beyond the middle, distally dehiscent, with 2 or 3 pairs of marginal spinules. Colour whitish, pellueid, tinged with erimson at either end. L. © 10 mm. North-Atlantic and Arctie Ocean (Trondhjemsfjord, Nordland and Fumark to _Vadsö). Depth 37-188 m. 4. H. robustus O. Sars 1895 H.r.,, G.O. Sars, Crust. Norway, v.1. p. 679 t. DI £.1. Head, lateral angles acute, scarcely produced. Side-plate 1 a little expanded below, 4!" much broader than the preceding pairs. Pleon segment 3, postero-lateral angles unusually short and broad, 4" segment with dorsal 60 Hippomedon, Glycerina depression shallow. Integument finely and irregularly retieulated. Eyes narrow oblong, widened a little below, without trace of visual elements, light red, transversely striped with öpaque white. Antenna 1, joints 1 and 2 slightly produced, flagellum in © with 11 joints, 1° of moderate length, accessory flagellum 4-jointed. Antenna 2, ultimate joint of peduncle little longer than penultimate; flagellum in © 32-jointed. Telson about twice.as long as broad, eleft extending about °/, of length, dehiscent only distally, carrying 2 or 3 pairs of marginal spinules. Body whitish, pellueid, without coloured patches, but side-plates and 24 joint in peraeopods 3—5 mottled with dark greenish spots. L. © 10 mm. Trondhjemsfjord. Depth 94 m. 5. H. longimanus (Stebb.) 1888 Platamon 1., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 643 t.13 | 1898 Hippomedon denticeulatus (part.). A. Della Valle in: F. Fl. Neapel, ©.20 p.808. Head, lateral angles moderately acute. Side-plate 1 a little. widened below, 4!" considerably. Pleon segment 3, postero-lateral angles acutely upturned, the process neither very long nor very sharp, segment 4 with ‚slight carina ending acutely. Eyes not observed. Antenna 1, 1° joint carinate, produced over the 24, flagellum in oO with 7 joints, 1° very long, accessory flagellum small, 3-jointed. Antenna 2, ultimate joint of peduncle scarcely longer than penultimate, flagellum 35-jointed. Maxilla 1 with 19 teeth on very broad apex of palp. Maxillipeds, outer plates not reaching greatly beyond 2% joint of palp. Gnathopod 1, 6t% joint fusiform, palm denticulate, and finger with cap over the apex, as in H. dentieulatus, H. propingvus, and probably other species. Gnathopod 2, 6*"joint distally widened, with excavate palm, finger comparatively large. Peraeopods 1 and 2, 7{k joint as long as 6", with cap over apex. Uropod 3, 24 joint of outer ramus not very large. Telson not twice as long as broad, cleft extending *,, of the length, dehiscent throughout, with 3 or 4 pairs of marginal spinules. L. about 17 mm. North-Atlantie (Cape Finisterre). Depth 2057 m 6. H. geelongi Stebb. 1888 H.g., T. Stebbing in: Rep. Voy. Challenger, v.29 p-635 t.11 | ?1895 Cheirimedon cerenatipalmatus (err., non T. Stebbing 1888!), A. Della Valle in: F. Fl. Neapel, v.20 p. 837. Head, lateral angles acute. Pleon segment 3, postero-lateral angles acutely upturned, the process not very large. No eyes perceived. Antenna 1, 1° joint very obtusely produced, not carinate, accessory flagellum 5-jointed. Antenna 2, ultimate Joint of pedunele not longer than penultimate, flagellum 30-jointed. Maxilla 1, inner plate with 7 very unequal setae, outer with 11 spines, palp with 12 spine-teeth. Gnathopod 1, 6tk joint as long as 5, slightly widened distally, the moderately oblique palm overlapped by the finger. Peraeopods, finger long and slender. Uropod 3 with plumose setae as well as spinules on both rami, the outer rather the longer, with a short 24 joint. Telson with 2 pairs of marginal spinules, cleft extending much beyond the middle, the apices a little dehiscent. L. 12 mm. The position of this speeies in the genus is rather doubtful. Port Phillip [Melbourne]. Depth 60 m. 35. Gen. Glycerina Hasw. 1880 Glycera (Sp. un.: @. ten (non Savigny 1822, Vermes!), Haswell in: P. Linn. Soe. N.S.Wales, r. 4 p- 256 | 1882 Glycerina (Sp. un. :@. tenwicornis), Haswell, Cat. Austral. Crust.. p. 933 | 1888 G., T. Stebbing in: Rep. Voy. Challenger, r.29 p.648. Glycerina, Scopelocheirus 61 Antenna 1 slender, rather long. Mandible, molar prominent. Maxilla 1, outer plate with oblique apical margin, 7 or 8 spine-teeth on apex of palp. Gnathopod 1 imperfectly subchelate. Gmathopod 2 subchelate. Uropod 3, rami broadly lanceolate. Telson deeply cleft. The genus and its 2 species remain in much obscurity. 2 species. Synopsis of species: Gnathopod 1, 6th joint much shorter than th . ....... 1. G. tenuicornis . p.61 Gnathopod 1, 6th joint much longer than th ...... 2. G.affinis . . . p.6l 1. G. tenuicornis (Hasw.) 1880 Glycera t., Haswell in: P. Linn. Soc, N. S.Wales, v.4 p.256 t.8 f.6 | 1882 Glycerina t., Haswell, Cat. Austral. Crust., p. 234 t.4 f. 3. . Head, lateral angles rather acutely - produced. . Pleon segment 3, postero-lateral angles subquadrate. Eyes long oval, nearly meeting above. Antenna 1, 1° joint stout, flagellum slender, longer than pedunele, accessory flagellum 9-jointed. Antenna 2 rather longer than antenna 1, flagellum 3 times as long as peduncle. Gnathopod 1 long, filiform, 6t" joint about ”/, length of 5%, irregularly ovoid, narrowed distally, with eurved setae on hind margin. Gnathopod 2 long, slender, stouter than gnathopod 1, 6% joint nearly twice as long as 5 [?], subquadrate, nearly. as broad as long, palm concave, defined by acutely produced angle. Peraeopod 3 much shorter than the rest, 24 joint eircular with deeply serrate hind margin. Peraeopods 4 and 5, 2° joint oval, not deeply serrate. Apices of telson acute. L. 8 mm. Coral Sea (Howiek Group), Port Jackson [East-Australia]. N 2. G. affinis Chilton 1885 @. «., Chilton in: P. Linn. Soe. N.S. Wales, v.9 p. 1036 t.47 f.1a,b. In general shape closely resembling G. tenuicornis. Gmathopod 1, 6" joint longer than 5**, tapering, without palm. Gnathopod 2 very long and 'slender, 6t% joint shorter than 5%, of uniform width, nearly 3 times as long as broad, palm rather oblique. Port Jackson [East-Australia]. 36. Gen. Scopelocheirus Bate 1851 Callisoma (non L. Agassiz 1846, Coleoptera!) (part.), A. Costa, Fauna Reg. Napoli, fasc. Marz. 1851 p.1 | 1888 C., T. Stebbing in: Rep. Voy. Challenger, v.29 p.247 1890 C., G.O.Sars, Crust. Norway, v.l p.52 | 1893 C©., A. Della Valle in: F. Fl. Neapel, v.20..p.838 | 1856 Scopelocheirus (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 S. (Sp. un.: $. crenatus), Bate in: Ann. nat. Hist., ser.2 «.19 p. 138. Side-plates large. Antenna 1 much shorter than äntenna 2, 1° jomt tumid, 15 joint of flagellum in 9 very large, accessory flagellum rather small. Antenna 2, basal joint swollen, flagellum long and slender, especially in 9; ‚antennae 1 and 2 in C with calceoli. Epistome projeceting, rounded, defined by a sinus from upper lip. Hind lobes of lower lip very divergent. Mandible, molar prominent, tapering, palp affıxed above it, large, setose. Maxilla 1, inner plate with several plumose setae along inner margin, outer plate with the usual spines, palp large with bifurcate apical spines. Maxilla 2, both plates short, broad, densely setose, setae ofinner plate fringing its inner margin. Maxillipeds, outer plates not reaching end of 24 joint of palp, fringed with spine-teeth, 4" joint of palp long and slender. Gnathopods 1 and 2 subequal in length. 62 Seopelocheirus Gnathopod 1, 6% joint long, narrow, with double row of delicate setae at apex, finger rudimentary in dense brush of setae. Gmnathopod 2 minutely chelate. Peraeopods 3—5, 24 joint expanded; 4tk joint of 3% pair expanded; 5th pair longest. Uropod 3 prolonged, rami subequal, with spinules and setae. Telson long, narrow, deeply cleft, with a pair of apical spinules. 2 species. Synopsis of species: Gnathopod 1, 6th joint much longer than öth ...... 1. 8. hopei ° . . . p.62 Gnathopod 1, 6th joint not longer than öth .. ..... 2. 8. crenatus . . p.62 1. S. hopei (A. Costa) 1851 Callisoma h., A. Costa, Fauna Reg. Napoli, fasc. - Marz. 1851 p.5 t.8u f.1| 1851 C. h., (A. Costa in:) F, W. Hope, Cat. Crost. Ital., p. 44 f.2 | 1893 C. h. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.839 t.6 f.11; t.26 f.1—15; t.48 f.19 | 1853 ©. barthelemyi, A. Costa, Deser. 3 Crost. dal Hope, p.7 | 1859 Anonyx kröyeri, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.45 42 f.7.| 1890 Callisoma k., G. O. Sars, Crust, Norway, ©.1 p.54 t.19 £. 28 | 1874 C. branickii, Wrzesniowski in: Ann. nat. Hist., ser.4 v.14 p.15. | Head, lateral angles little produced. Side-plate 1 widened below, not completely covering ‘mouth-organs, expansion of 4! not quadrate. Pleon segment 3, postero-lateral angles almost quadrate, hind margin smooth, 4b with dorsal depression moderately deep, followed by rounded carina. Eyes broad oval, dark brownish (Sars), scarlet (Della Valle). Antenna 1 ino, flagellum with 7 or 8 joints, 1° not very large, accessory flagellum with 3 or 4 joints. Mandible, 24 joint of palp broad. Gnathopod 1, 6 joint considerably longer than 5%, margins parallel. Gnathopod 2, 5tk joint much widened distally. Peraeopods 3—5, 4 joint considerably dilated in the 34, but much less so in the other two. Uropod 3, inner ramus a little shorter than outer, but scarcely narrower. Telson about twice as long as broad, cleft almost to the base. Colour yellowish, without distinet pigmentary spots. L. © 5:5 (Sars), 7 (Bruzelius) mm. Mediterranean; North-Atlantie, North-Sea, Skagerrak, Kattegat and Baltie (Great Britain, Norway, Sweden). Depth 58-78 m. 2. S. crenatus Bate 1856 $. breviatus (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.58 | 1857 S. crenatus, Bate in: Ann. nat. Hist., ser.2 0.19 p.138 | 1861 Callisoma crenata, Bate & Westwood, Brit. sess. Crust., «.1 p. 120 f. | 1890 ©. e., @. ©. Sars, Crust. Norway, v.1 p.53 t.19 f.1 | 1890 T’ryphosa serra, Meinert in: Udb. Hauchs, v.3 p.156 t.1 f.80-—88 | 1893 Callisoma hopei (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 839. Head, lateral angles slightly projecting. Side-plate 1 widened below, completely covering mouth-organs, expansion of 4" quadrate. Pleon segment 3 almost quadrate, hind margin crenulate, 4 with deep dorsal depression in front of rounded carina. Eyes broad oval, reddish brown, orange-coated. Antenna 1, flagellum ‘with 10—12 joints, 1° very large only in Q, accessory flagellum 3-jointed. Antenna 2 in Q, flagellum 24-jointed. Gmnathopod 1, 6h joint subequal to 5t", slender, slightly narrowed at the middle. Gnatho- pod 2, 6! joint much shorter than the slender 5t". Peraeopod 3, 24 joint greatly dilated. Peraeopods 3 and 4, 4tk joint dilated. Uropod 3, inner ramus as long as outer. Telson nearly 3 times as long as broad, deeply cleft, with a pair of dorsal spinules.. Colour yellowish, with numerous orange spots. L. 0 95 mm. North-Atlantie, North-Sea and Skagerrak (Great Britain, South- and West- Norway); Kattegat. | ; Alicella, Uristes 63 37. Gen. Alicella Chevreux 1899 Alicella (Sp. un.: A. gigantea), Chevreux in: Bull, Soe. zool. France, 2.2Pp.154. Head short, hollowed in front. Side-plates not so deep as their respective segments. Eyes large, imperfectly developed. Antennae 1 and 2 slender. Antenna 1 with accessory flagellum well developed. Lobes of lower lip apically narrowed. Mandible with broad dentate cutting edge,. accessory plate on left mandible .denticulate, molar consisting of a narrow, spinulose, backward-pointing lamina, palp short, 34 joint dilated, strongly setose. Maxilla 1, inner plate obliquely truncate, fringed with 16 plumose setae, outer plate with 9 spines, 24 joint of palp long, with 23 apical spines. Maxilla 2, inner plate a little shorter than outer, each carrying long plumose setae. Maxillipeds, inner plates obliquely truncate at apex, outer plates broad, nearly reaching end of palp’s 24 joint, ultimate joint of palp dactyliform. Gmathopod 1 short, simple. Gmathopod 2 long, slender, feebly subchelate. Uropod 3, rami long, equal, lanceolate. Telson elongate, some- what tapering, cleft nearly to the base. 1 species. 1. A. gigantea Chevreux 1899 A. g., Chevreux in: Bull. Soc. zool. France, v.24 p.154 f. 1—6. Pleon segments 3—6 dorsally grooved and slightly bicarinate. Head in front forming a kind of vault, at bottom of which the antennae 1 and 2 are inserted. Side-plate 5 less deep than side-plate 4, much broader than deep. Pleon segment 3, postero-lateral corners quadrate. Eyes opaque white or orange, irregularly reniform, without trace of ecelli. Antenna 1, 24 joint not half as long as 1°t, 34 very short, flagellum 35-jointed, accessory flagellum 9-jointed. Antenna 2 a little the longer, ultimate joint of pedunele much longer than penultimate, flagellum 60-jointed. Epistome little prominent, upper lip with unsymmetrical apex, feebly bilobed. Gnathopod 1, 6% joint tapering, rather shorter than 5t%, finger more than one third as long as 6%. Gmnathopod 2 more than twice as long as gnathopod 1, 6tR joint very slender, nearly as long as 5%, its front and hind margins parallel, finger feeble and short. Peraeopods 1 and 2 not longer than gnathopod 1, joints 2—4 rather robust, the following slender, very short. Peraeopods 3—5, 24 joint somewhat expanded, the rest slender. Peraeopods 4 and 5 equal, longer than peraeopod 3, finger very short. Pleopods 1—3, rami very long, many-jointed. Uropods 1 and 2, outer branch nearly smooth, rather shorter and narrower than the spinulose inner branch. Uropod 3, rami fringed with long plumose setae. Telson with numerous little groups of spinules along back of each lobe, apex of. each emarginate, carrying 2 spines. Colour white tinted with greenish yellow. L. reaching 140 mm. I North-Atlantie (lat. 31° N., long. 28° W.). Depth 5285 m. 38. Gen. Uristes Dana 1849 Uristes, J. D. Dana in: Amer. J. Sei., ser.2 v,8 p. 136 | 1852 U. (Sp. un.: U. gigas), J. D. Dana in: P. Amer.Ac., v.2 p.209 | 1862 U., Bate, Cat. Amphip. Brit. Mus,, 'p.89 | 1888 U., T. Stebbing in: Rep. Voy. Challenger, v.29 p.263 | 1893 T., A. Della Valle in: F. Fl. Neapel, v.20 p.836 | 1899 TU., T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.211 | 1891 Pseudotryphosa, G. O. Sars, Crust. Norway, v.1 p.83 | 1893 Tryphosella (part.), J. Bonnier in: Bull. sei. France Belgique, v.24 p. 170. 64 Uristes Body stout. Pleon strongly developed. Side-plates 1—4 in position not oceupying a greater length than side-plates 5—7 in position. Antenna 1 and 2 calceoliferous, the flagella many-jointed. Antenna 1, flagellum stout, accessory flagellum slender. Antenna 2 not much longer than antenna 1. Epistome little or not at all projeceting. Mandible, molar well developed, palp affıxed nearly over it, the 34 joint elongate. Maxilla 1, inner plate with 2 plumose setae, outer with very oblique apex, spine-teeth on apex of palp very small. Maxillipeds, outer plates broad, not quite reaching apex of 24 joint of palp, palp rather robust, 4% joint unguiform. Gmathopod 1 imperfectly subchelate. Gnathopod 2 subchelate. Peraeopods 3—5, 24 joint much expanded. Uropod 3 extending much beyond uropod 2, both rami carrying setae on inner margin, inner ramus longer than 1° joint of outer. ' Telson large, twice as long as broad, deeply cleft. 2 species. Synopsis of species: Side-plate 9 am0olh 72:0, Zar ee a 1. U.gigas... . . p.64 Side-plate 5 with oentral boss » , ..... 2. u 22: 2. U. umbonatus . p. 64 1. U. gigas Dana 1849 U., J. D. Dana in: Amer. J. Sei., ser.2 0.8 p.136 | 1852 U. yigas, J.D. Dana in: P. Amer. Ac., v.2 p.209|1853&55 U. g., J. D. Dana in: U. 'S. expl. Exp., ve. 1311 p.917; 1.62 f.3a—g | 1899 D.g., T. Stebbing in: Amn. nat. Hist.,'ser. 7 0.4 p.211 | 1888 U. g. + Tryphosa antennipotens, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.266; p.617 t.6 | 1891 Pseudotryphosa a., G. O. Sars, Crust. Norway, v.1 p-83 | 1893 Anonyx a. + 4. ?gigas, A. Della Valle in: F. Fl. Neapel, v. 20 p. 827, 836 1893 Tryphosella a., J. Bonnier in: Bull. sei. France Belgique, v.24 p. 171. Head, lateral angles acute. Side-plate 1 narrowed below, concealing the mouth-organs, 2—4 successively deeper, overlapping. Pleon segment 4 dorsally depressed, then carinate, with upturned apex; postero-lateral angles of segment 3 produced, very broadly rounded. Eyes reniform, seemingly large, indistinet in spirit. Antenna 1, 1° joint long, flagellum with 52 joints, 1°! not very long, accessory flagellum slight, 4-jointed, shorter than 1° ofprimary. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 53-jointed, rather louger and thinner than in antenna 1, in both with ealceoli in 9. Epistome a little prominent. , Lower lip, mandibular processes not specially divergent. Maxilla 1 with setae on outer margin below palp, and also (according to Dana) at base of its 1° joint. Gnathopod 1, 6% joint a little longer than 5tb and nearly as broad, slightly narrowed distally, palm ill-defined, 7" joint less than half length of 6". Gnathopod 2, 6" joint more than half as long as 5!ı, palm transverse. Peraeopods 3—5, 24 joint much expanded, hind margin serrulate. Peraeopod 5 rather shorter than peraeopod 4. Uropod 3, rami long, broadly lanceolate, subequal, carrying spines and plumose setae. Telson long, narrowing a little distally, eleft *, of length, with 5 lateral and 2 apical spines to each lobe. L. 18 mm. Antaretie Ocean; Southern Indian Ocean (Heard Island, depth 274 m). 2. U. umbonatus (O. Sars) 1882 Ichnopus u., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.79 t.3 f.2 | 1891 & 95 Pseudotryphosa iwmbonata, G. O. Sars, Orust. Norway, v.1 p.88 t.29 f.2; p. 686 | 1893 Anonyx umbonatus, A. Della Valle in:F, Fl. Neapel, v.20 p.825 | 1899 Uristes u., T. Stebbing in: Ann. nat. Hist., ser.7 v.£ p.211. Head, lateral angles acute. Side-plate 1 narrowed_ below, 5tk broader than deep, with central outstanding boss or umbo. Pleon segment 3 nearly De EL. 6 ae 5 1) Dr ee a or a a he I = a a ae a en N Zn en m a oT a m 0 2 Tal Sl) LA ZU Dale 2 Brian ud SA I a T Uristes, Centromedon i 65 quadrate, 4 without any dorsal projeetion. Eyes narrow, sigmoid, light red, evanescent in spirit. Antenna 1, 1° joint rather elongate, flagellum stout, of 25 joints, 1°t largest, not very large, accessory flagellum almost filiform, of 6 small joints. Antenna 2 rather longer than antenna 1, ultimate joint of pedunele longer than penultimate, flagellum not very stout, 23-jointed. Epistome not projecting. Gnathopod 1, 6% joint much longer than 5", oblong, palm very oblique, ill-defined, 7% joint about half as long as 6". Gnathopod 2, 6! joint rather broader than 5t%, and more than half as long. Telson tapering much, carrying 2 pairs of dorsal spinules. Colour whitish. L. 11 mm. Aretie Ocean, North-Atlantic and North-Sea (West-Norway), Skagerrak. Depth 55—790 m. 39. Gen. Centromedon O. Sars 1891 Centromedon (Sp. typ.: ©. pumilus), &. O. Sars, Crust. Norway, v.1 p.99 | 1893 C., J. Bonnier in: Bull. sei. France Belgique, v.24 p. 173. Head, lateral angles acutely produced. Side-plates deep. Pleon segment 3, postero-lateral angles acutely upturned. Eyes imperfeet or wanting. Antenna 1 and 2 in © stout, subequal. Epistome not projecting. Mandible, molar conical, palp rather large, affiıxed over molar. Maxilla 1, inner plate’ with 2 setae, outer with usual,spines, apex oblique, palp with few spines on apex. Maxilla 2, inner plate a little shorter than outer. Maxillipeds, outer plates not reaching end of 24 joint of palp, which has the 4" joint small. Gnatho- pod 1 stout, imperfectly subchelate. Gnathopod 2 subchelate. Peraeopods 3—5, ‚24 joint large; 5th peraeopod much shorter than 4. Uropod 3 rather small, rami without marginal setae. Telson oblong, deeply cleft, with 2 pairs of apical spinules. 4 species. Synopsis of species: Peraeopod 5, 2d joint with lower hind corner acute 1. C. calcaratus . p.65 1 Peraeopod 5, 2d joint with lower hind comer rounded — 2. 0 | Head, lateral angles slightly upturned. . ... . - 2. C. productus. . p.66 | Head, lateral angles straight pointed — 3. f Pleon segment 4 with rounded earina. ... ... . 38. C. pumilus. . . p.66 \ Pleon segment 4 with pointed carina . »..--.. 4. C.typhlops . . p.66 1. C. calcaratus (O. Sars) 1879 Anonyx e., Hippomedon?, G. O. Sars in: Arch. Naturv. Kristian., ©. 4 p. 440 | 1885 A.c., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 142 t.12 £.3 | 1893 A. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 829 | 1891 A. c., Centromedon?, G. O. Sars, Crust. Norway, v.1 p.100, Head, lateral angles produced to a straight spine-like point. Side- plate 1 not narrowed below. Pleon segment 3, postero-lateral angles acutely upturned to a greater extent than in any other species of the genus, 4% without carina. Eyes wanting, unless represented by a diffuse whitish-yellow pigment. Antenna 1, peduncle rather stout, flagellum with 9 joints, 1° not very long, accessory flagellum 3-jointed. Antenna 2 about as long as antenna 1, ultimate Joint of pedunele much shorter than penultimate, flagellum 9-jointed. Gnatho- pod 1, 6% joint longer than 5%, rather narrow, tapering, palm undefined. Gnatho- pod 2, 6tk joint comparatively broad, palm not produced. Peraeopods 1 and 2, 7 joint almost straight. Peraeopods 3 and 4, 24 joint oval. Peraeopod 5, 24 joint rather quadrate, the lower hind corner outdrawn to a spine-like point. Uropod 3 Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 5 66 Centromedon, Cheirimedon nearly as in ©. pumilus, but 24 joint of outer ramus less elongate. Telson very deeply cleft, much tapering. Colour whitish. L. 8 mm. Arctic Ocean (between Iceland and Jan Mayen, North West of Bear Island). Depth 1240—2260 m. 2. C. productus (Go&s) 1866 Lysianassa producta, Go&s in: Öfv. Ak. Förh., v.22 p.519 1.37 f.4.| 1891 Centromedon affinis, G. O. Sars, Crust. Norway, v.1 p.101 | 1893 C. a., Anonyx a., A. Della Valle in: F. Fl. Neapel, v.20 p.831, 920. Nearly allied to C. pumilus, but differs by its much larger size, by the lateral corners of the cephalon being not straight but slightly upturned at the tip, and by having the postero-lateral angles of pleon segment 3 considerably narrower and more produced (Sars). L. 8 mm (Goös). Aretie Ocean and North-Atlantie (Spitzbergen, Norway). 3. C. pumilus (Lillj.) 1865 Anony« p., W. Lilljeborg in: N. Acta Soc. Upsal., ser.8 v.6 nr.1 p.26 t.4 f.35—41 | 1893 A.p., A. Della Valle in: F. Fl. Neapel, v.20 p. 831 | 1891 Centromedon p., G. O. Sars, Crust. Norway, v.1 p.100 t.34 £.2. Head, lateral angles drawn out into a straight spine-like point. Side- plate 1 narrowed below. Pleon segment 4 with small rounded carina. Eyes wanting. Antenna 1, pedunele not very stout, flagellum with 8 joints, 1° not elongate, accessory Hagellum 3-jointed. Antenna, 2 scarcely longer than antenna 1, ultimate joint of pedunele a little shorter than penultimate, flagellum 9-jointed. Gmathopod 1, 6% joint as long as 5tt, tapering distally, palm oblique, ill-defined, 7*ı half length of 6%. Gmathopod 2, 6tk joint oblong oval, more than half length of 5%, palm transverse. Peraeopods 1 and 2, 6! joint slender, 7! long. Uropod 3, inner ramus longer than basal joint of outer, which has the 29 joint nearly as long as the basal. Telson with 1 or 2 pairs of dorsal spinules. Colour whitish, tinged with red at ends of segments and joints. L. © 5 mm. Arctic Ocean, North-Atlantie (North-America, Norway), Skagerrak (Bohuslän). Depth 94—188 m. ; 4. C,typhlops (O.Sars) 1879 Anony« t., G.O.Sars in: Arch. Naturv. Kristian., v.4 p.486 | 1885 A.t., G.O. Sars in: Norske Nordhavs-Exp., v.6 Crust.I p. 145 t.12 f.4a—k | 1891 A. t., Centromedon?, G.O.Sars, Orust. Norway, v.1 p.100 | ?1889 A. caecus, Vosseler in: Arch. Nabiig, v.551 p.155 t.8 f.8—14 | 1893 A. nugax (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 834. Head, lateral angles pr oduced, somewhat acutely. Side-plate 1 narrowed below. Pleon segment 3, postero-lateral angles shortly but acutely upturned, 4th with an acutely ending carina. Eyes wanting. Antenna 1, pedunele short and thick, flagellum of 11 joints, 1° large, accessory flagellum slender, 4-jointed. Antenna 2 rather longer than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum 18-jointed. Gnathopod 1, rather stout, 6'h joint a little longer than 5", with oblique but distinet palm. Peraeo- pods 3—5, 24 joint oval. Uropod 3 as in C. calcaratus (p. 65), telson with cleft not quite so deep. Colour whitish, tinged with red. L. 15 mm. Arctie Ocean (between Jan Mayen and Finmark). Depth 3200 m. 40. Gen. Cheirimedon Stebb. 1888 Cheirimedon (Sp. un.: (©. crenatipalmatus), T. Stebbing in: Rep. Voy. Challenger, v.29 p.638 | 1890 C., G. O. Sars, Crust. Norway, v.1 p.34 | 1893 C., J. Bonnier in: Bull. sei. France Belgique, v.24 p.174 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p. 837. Cheirimedon, Tryphosella 67 Head, lateral corners angularly projecting. Body compressed; side-plates deep, 4" deeply not broadly excavate. Pleon segment 4 with high compressed projection. Antenna 1, 24 and 34 joints short, 1°t of flageilum long. Epistome slightly projecting, defined by short ineision from upper lip. Mandible with denticulate molar, palp elongate, attached above the molar, its 1% joint short. Maxilla 1, inner plate with 2 plumose setae, outer with 11 spines, palp with many apical spine-teeth. Maxilla 2, plates fringed at the apices. Maxillipeds, plates of moderate size, 24 joint of palp not longer than 1%, Gmathopod 1 subchelate, 5!" joint very short, triangular, 6!" large, expanding gradually to the transverse palm, 7% joint as long as breadth of palm. Gnathopod 2 subchelate. Peraeopods 1 and 2, 4!" joint rather long. Peraeo- . pods 3—5, 24 joint longer than broad. Branchial vesicles simple. Uropod 3, pedunele not very long, outer ramus 2-jointed, much longer than the inner. Telson narrowing distally, deeply cleft. 2 species. Synopsis of species: Pleon segment 3, postero-lateral angles uneinate . . 1. C. crenatipalmatus. . p. 67 Pleon segment 3, postero-lateral angles quadrate. . 2. C.latimanus. .. . . p- 67 1. C. erenatipalmatus Stebb. 1888 ©. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.638 t.12 | 1893 C. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 837. F Head, lateral lobes sharply produced. Pleon segment 3, postero-lateral | angles acutely and strongly upturned. Antenna 1, flagellum with 12 joints, of R which 1° very long, longer than 3-jointed accessory flagellum; antenna 2, ulti- h mate and penultimate joints of pedunele subequal, flagellum 7-jointed. Maxillal, palp with 9 teeth on right, 12 on left maxilla. Gmathopod 1, palm margin erenulate. Gnathopod 2, 34 joint shorter than 5t", which is rather robust, 6!h scarcely half length of 5", palm not at all produced, finger shutting closely upon it. Telson nearly once and a half as long as broad. L. © 7’5 mm. Cumberland Bay [Kerguelen Island]. Depth 230 m. y 2. C. latimanus (0. Sars) 1882 Normania latimana, G. ©, Sars in: Forh. Selsk. Christian., nr. 18 p.83 t.3 £.6,6a | 1890 Cheirimedon latimanus, G. O. Sars, Crust. Norway, v.1 p.35 t.13 f.2 | 1893 ©. L., A. Della Valle in: F. Fl. Neapel, v.20 p. 838 t. 60 f.50. Head, with lateral lobes produced almost acutely. Pleon segment 3, postero-lateral angles quadrate. Eyes narrow oval. Antenna 1, flagellum with 7 joints, of which the 1° moderately long, about half as long as. the slender 3-jointed accessory flagellum; antenna 2, ultimate joint of peduncle much shorter than penultimate, flagellum 6-jointed. Gnathopod 1, 6 joint with palm margin not erenulate. Gnathopod 2, 6% joint fully half length of 5t". Telson almost twice as long as broad. L. © 6 mm. North-Sea (Bukken [West-Norway)). Ed im mal un 1 00 Su 2 5 Lei ni ua Linn nei u 41. Gen. Tryphosella Bonnier 1890 Orchomenella? (part.), &. ©. Sars, Crust. Norway, v.1 p.66 | 1893 Tryphosella (part.), J. Bonnier in: Bull. sei. France Belgique, v.24 p. 170. Antenna 2 in o little longer than antenna 1. Mandible with denticulate molar, which is prominent, pointing backward, palp with 1° joint short, dr 68 Tryphosella, Tryphosa attached just over molar. Maxilla 1, inner plate with 2 setae, outer with 11 spines on sliehtly. decurrent apex. Maxilla 2, outer plate rather longer \ than inner. Maxillipeds, inner plates normal, outer fully reaching end of 24 joint of palp, fringed on inner margin with stout spine-teeth, 24 joint of palp not longer than 1%. Gnathopod 1 setose, subchelate, 34 joint not longer than 4, 6tk much longer than 5th, oblong, palm transverse. Gnathopod 2 (Fig. 11) minutely chelate, 6!" joint less than half as long as HZ 5th, Peraeopods 3—5, 24 joint large. Peraeopod 4 6% joint longer than peraeopod 5. Uropod 3, inner ramus Fig. 11. T. barbatipes. as long as basal joint of outer. Telson cleft beyond Gnathopod 2. the. centre. 1 species, 1. T. barbatipes (Stebb.) 1888 Tryphosa b., T. Stebbing in: Rep. Voy. Challenger, v.29 p.621 t.7 | 1890 T. b., Orchomenella?, G. O. Sars, Crust. Norway, v.1 p-66 | 1893 Anonyx b., A. Della Valle in: F. Fl. Neapel, v.20 p.814 | 1893 Tryphosella b., J. Bonnier in: Bull. sei. France Belgique, v.24 p.171, 195. Head, lateral corners much produced, acute. Side-plate 1 narrowed below, 5!" as broad as deep. Pleon segment 3, postero-lateral angles slightly rounded. Antenna lin oO, flagellum with 8 joints, 1° large and equal to 4-jointed accessory flagellum. Antenna 2 in © , ultimate and penultimate joints of peduncle subequal, flagellum about 7-jointed. Peraeopods, 4 joint only little widened. Telson oblong oval, cleft for °/, of its length. L. © 9 mm. Southern Indian Ocean (Kerguelen Island). Depth 228 m. 42. Gen. Tryphosa Boeck ?1849 Stenia, J. D. Dana in: Amer. J. Sci., ser.2 v.8 p.136 | 1871 Tryphosa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.117 | 1876 T. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.180 | 1891 & 95 7, G. O. Sars, Crust. Norway, v.1 p. 75; p- 683, 684 | 1893 Tryphosella (part.), Typhosa (laps.), J. Bonnier in: Bull. sei. France Belgique, v.24 p. 170. Side-plate 1 usually narrowed below. Accessory flagellum of antenna 1 well developed. Antenna 2 in scarcely half the length of the body. Epistome usually projecting in front of upper lip, rounded. Mandible, molar denticulate, prominent, palp attached just over it, with 1° joint short, 24 elongate. Maxilla 1, inner plate short with 2 setae, outer obliquely truncate with crowded spines. Maxilla 2, outer plate a little longer than inner. Maxillipeds normal, outer plates reaching beyond 24 joint of palp, the margin crenulate. Gnathopod 1 slender, subchelate, 6!" joint scarcely as long as Ö5th, both narrow. Gmnathopod 2 subchelate, 6!" joint rather stout, more than half as long as 5th, Peraeopods 3—5, 24 joint large, rest of limb sender. Uropod 3, inner ramus at least as long as basal joint of outer. Telson oblong oval, deeply cleft. 9 species. Synopsis of species: Eyes wanting — 2. Eyes present — 5. 0 Pleon segment 4 not dorsally elevated — 3. Pleon segment 4 dorsally elevated — 4. EEE N U We DD ON el ld en 1 HÖR Anl a a a Tryphosa 69 Pleon segment 3, postero-lateral corners not acute 3 EORDDIO Serien ee er 1. T.insignis.. . . p.69 Pleon segment 3, postero-lateral corners acutely a er ea a ee 2. T. kergueleni . p.69 ä Aelson Taperiee DIR. 0. en 3. T. trigonica . . p.70 Toon: TRDORIUE TanelE 5 0 a: ee een 4. T. pusilla . . . p.70 5 Pleon segment ee 5. nar8l:: „72.070 Pleon segment 4 carinate — 6. 6 Head with lateral angles acute . . .. :..... 6. T. angulata . . p.70 Head with lateral angles rounded — 7. 7 Gnathopod 2, 6th joint broader than 5thı . .... 7. T. compıessa . p.7l Guathopod 2, 6th joint not braader than 5th — 8, 8 Pleon segment 4 with rounded cearina. . ..... 8. T.nanoides . . p.7l Pleon segment 4, carina angularly produced at apex 9. T. heringii . . . p.71 1. T.insignis Bonnier 1896 T.i., J. Bonnier in: Ann. Univ. Lyon, v.26 p.619 t. 36 £.1. Head, lateral corners produced to a right-angled lobe with straight sides. Side-plate 1 scarcely narrowed at rounded distal end, 4% large, much produced backward. Pleon segment 3, postero-lateral eorners produced backward in narrowly rounded lobe, segment 4 not dorsally elevated. Eyes wanting. Antenna 1 in young JS, flagellum of 7 joints, 15! as long as the peduncle’s short 24 and 34 joints combined, the other 6 joints small, without calceoli, accessory flagellum 3-jointed. Antenna 2 scarcely longer than antenna 1, flagellum with 7 small joints. Epistome not projecting in front of upper lip. Gnathopod 1 slender, 5th and 6th joints equal, palm small, defined by 2 spinules, finger bifid. Gnatho- pod 2 scarcely longer, 5!" joint considerably longer than 6", Peraeopod 3, 24 joint nearly as broad as long, smaller than the side-plate. Peraeopod 4, 24 joint oblong oval, rest of limb more elongate than in peraeopods 3 and 5. Peraeo- pod 5, 24 joint very large, rest of limb small. Uropod 3, 2-jointed outer ramus with 1 seta on outer margin, inner ramus quite unarmed. Telson deeply cleft, with 2 pairs of marginal and 1 of apical spines. L. 6 mm. Bay of Biscay. Depth 950 m. 2. T. kergueleni (Miers) 1875 Lysianassa k., Miers in: Ann. nat. Hist., ser. 4 e.16 p.74 | 1879 Anonyx k., Miers in: Phil. Tr.. v.168 p.207 t.11 f.4 | 1888 Hippo- medon k., T. Stebbing in: Rep. Voy. Challenger, v.29 p.623 t.8 | 1893 H. holbölli (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 808. Head, lateral angles acutely produced. Side-plate 1 not narrowed below. Pleon segment 3, postero-lateral angles upturned, the process long, narrow, acute, segment 4 not apically elevated. Eyes doubtful. Antenna 1, 1° joint broad and long, flagellum with 14 joints, 1° not very long, accessory flagellum 5-jointed. Antenna 2, ultimate joint of pedunele a little shorter than penultimate, flagellum 16-jointed. Maxilla 1, with 12 spine-teeth on apex of palp. Maxillipeds, with spine-teeth on inner margin of outer plates. Gnatho- pod.1, 6% joint very little shorter than 5%, rather narrow, of uniform width, palm oblique. Gnathopod 2, 6 joint long ovate. Uropod 3, inner ramus longer than basal joint of outer. Telson nearly twice as long as broad, cleft extending more than three fourths of length, not dehiscent, with 3 pairs of marginal spinules and a pair in the emarginate apices. L. 10-mm. Southern Indian Ocean (Kerguelen Island). Depth 37 m. 70 Tryphosa 3. T. trigoniea (Stebb.) 1888 Hippomedon trigonicus, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.630 t.9 | 1893 Anonya miersi?, A. Della Valle in: F. Fl. Neapel, v.20 p.814, 952. Head, lateral angles moderately acute. Pleon segment 3, postero-lateral angles upturned, the process short, only subacute, segment 4 with raised angular apex. Antenna 1, 1° joint long and narrow, flagellum with 11 joints, 1° not very long, accessory flagellum 3-jointed. Antenna 2, ultimate and antepenultimate joints of peduncle equal, shorter than penultimate, flagellum 9-jointed. Epistome a little prominent, rounded. Maxillipeds and gnathopod 1 as in T. kergueleni (p. 69). Gnathopod 2, 6! joint rather stouter. Uropod 3, inner branch not longer than basal joint of outer. Telson not greatly longer than broad, the cleft not dehiscent, */, of the length, with 3 pairs of marginal spinules and a pair on the truncate apices. L. 6 mm. Southern Indian Ocean (Kerguelen Island). 4. T. pusilla (O. Sars) 1879 Anony«x (T.) pusillus, &. OÖ. Sarsin: Arch. Naturv. Kristian,, v.4 p.439 | 1885 T'. pusilla, G.O,Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.151 1.18 £.2, 2a. Head, lateral angles prominent, obtuse. Pleon segment 3, postero-lateral angles acute, scarcely produced, segment 4 hunched above. Eyes wanting. Antenna 1, flagellum with 11 joints, 1° rather large, accessory flagellum very slender, 3-jointed. Antenna 2 about equal to antenna 1, ultimate joint of peduncle very short, flagellum 12-jointed. Epistome not deseribed. Gnatho- pod 1, 6" joint subequal to 5t%, slender, palm rather oblique. Telson tapering much. Colour whitish. L. 5'5 mm. Arctie Ocean (between Jan Mayen and Iceland). Depth 1890 m. 5. T. sarsi (Bonnier) 1891 T. nana (err., non Anonya& nanus Kroyer 1846!), G. O. Sars, Crust. Norway, v.1 p.76 t.27 f.1 | 1893 Tryphosella sarsi, J. Bonnier in: Bull. sci: France Belgique, v.24 p.171 | 1895 Tryphosa s., G. O. Sars, Crust. Norway, v.1 p. 684. Head, lateral angles little projeeting, rounded. Pleon segment 3, postero- lateral angles quadrate, segment 4 without dorsal projeetion. Eyes oblong oval, light red. Antenna 1, fagellum with 9 joints, 1° rather sbort, accessory flagellum slender, of 5 joints, 1% short. Antenna 2 in © little longer than antenna 1, flagellum 9-jointed; antenna 2 in J twice as long as antenna 1. Epistome obtusely angular in front. Gnathopod 1, 6th joint about as long as 5th, palm nearly transverse. Gnathopod 2, 6th joint oval, scarcely narrower than 5%, Uropod 3, inner ramus equal to basal joint of outer. Telson with 2 pairs of marginal spinules. Body whitish, pellueid, with a few reddish spots. L. 9 4 mm. North-Atlantie (Norway). Depth 11—38 m. 6. T. angulata O.Sars 1891 T.a., G. O. Sars, Crust. Norway, v.1 p.78 t.28 f£.1 | 1893 Tryphosella a., J. Bonnier in: Bull. sei. France Belgique, v.24 p.171 | 1893 Anonyx& angulatus, A. Della Valle in: F. Fl. Neapel, v.20 p. 825. Head, lateral angles drawn out into a little tooth. Pleon segment 3, postero-lateral angles quadrate, segment 4 with high carina, the apex vertically two-angled. Eyes very large, narrow oblong, light red. Antenna 1, peduncle narrower than usual, flagellum setose, of 14 joints, 1% not long; accessory flagellum of 5 joints, none long. Antenna 2 in © a little longer than antenna 1, flagellum 15-jointed. Epistome prominent, evenly rounded. Gmathopod 1, Tryphosa 71 6'h joint scarcely as long as 5t%, palm oblique, finger with secondary tooth conspicuous. Gnathopod 2, 6!" joint as broad as 5th, Uropod 3, inner ramus equal to basal joint of outer. Telson with 3 or 4 pairs of marginal spinules. Colour pale reddish. L. © 7 mm. Aretie Ocean (Nordland, Finmark), Trondhjemsfjord. Depth 188—282 m. 7. T. compressa O. Sars 1891 & 1895 T.c., G. O.Sars, Crust. Norway, v.1 p- 76; p.685 t. IV f.2 | 1893 Tryphosella e., J. Bonnier in: Bull. sei. France Belgique, v.24 p.171. Head, lateral angles much projecting, narrowly rounded. Pleon segment 3, postero-lateral angles less than a right angle, tbe point not sharpened, segment 4 as in T. angulata. Eyes long, narrow, slightly sigmoid, light red. Antenna 1, 1° joint of pedunele rather long, flagellum 12-jointed, accessory flagellum with 6 joints, 1° short. Antenna 2 in O subequal to antenna 1, flagellum 14-jointed. Epistome large, evenly rounded. Gmnathopod 1, 6" joint shorter than 5tt, oblong linear, the palm small, a little oblique, finger with secondary tootb conspieuous. Gnathopod 2, 6% joint large, hirsute, broader than 5th, distally widened, palm transverse, defined by a projecting angle, finger rather strong and curved. ‚Uropod 3, inner ramus scarcely longer than basal joint of outer. Telson with 3 pairs of marginal spinules. L. Q 8 mm. Arctic Ocean (West of Spitzbergen, Nordland). 8. T. nanoides (Lillj.) 1865 Anonyx n., W. Lilljeborg in: N. Acta Soe. Upsal., ser.8 v.6 nr.1 p.25 t.3 f.32—34 | 1898 A.n., A. Della Valle in: F. Fl. Neapel, v.20 p. 852 | 1871 Tryphosa n., A. Boeck in: Forh. Selsk. Christian., 1870 p.118 | 1876 T.n., A. Boeck, Skand. Arkt. Amphip., v.2 p.186 | 1891 & 95 T.n., G. O. Sars, Crust. Norway, v.1p.79 t.28 f£.2; p.684 | 1893 Tryphosella n., J. Bonnier in: Bull. sei. France Belgique, v.24 p.171. Head, lateral angles little projeeting, rounded. Pleon segment 3, postero-lateral angles a little obtusely upturned, segment 4 with rounded carina overlapping segment 5. Eyes large, reniform, pale red. Antenna 1, peduncle massive, flagellum with 11 joints, 1° very large, accessory flagellum with 10 joints, 1°° comparatively large. Antenna 1 in © rather longer than antenna 2, flagellum 22-jointed. Epistome with narrow rounded lobe overhanging upper lip. Gnathopod 1, 6!" joint a little shorter than 5tt, palm transverse. Gnathopod 2, 6t% joint about half as long as 5tt, scarcely as broad. Uropod 3 larger than usual, inner ramus subequal to basal joint of outer, both with small setae on inner margin. Telson very slightly tapering, with 3 or 4 pairs of marginal spinules.. Body whitish pellucid, with diffuse orange patches. L. 9 8 mm. Aretice Ocean; North-Atlantie, North-Sea, Skagerrak, Kattegat and Baltie (Norway, Sweden, Denmark, Scotland). Depth 94—188 m, 9. T.horingii Boeck 1871 T.h., A. Boeck in: Forh. Selsk. Christian., 1870 p.118 | 1876 T. höringiü, A. Boeck, Skand. Arkt. Amphip., v.2 p.182 | 1891 T. hörringii, . T. höringiüi, &. O. Sars, Crust. Norway, v.1 p.77 t.27 f£.2 | 1893 Tryphosella hörringii, J. Bonnier in: Bull. sci. France Belgique, ».24 p.171 | 1893 Anonyx nanus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 820. Head, lateral angles projecting, rounded. Pleon segment 3, postero- lateral angles almost quadrate, segment 4 with high carina angularly produced at apex. Eyes large, oblong oval, widened below, light red. Antenna 1, peduncle stout, flagellum with 11 joints, 1° not very large, accessory flagellum with 6 joints, 72 Tryphosa, Chironesimus, Eurythenes 1st the longest. Epistome rather prominent, rounded. Gnathopod 1 slender, 6th joint a little shorter than 5%, palm nearly transverse. Gmnathopod 2, 6th joint searcely as broad as 5%. Uropod 3, inner ramus rather longer than basal joint of outer. Telson with 3 pairs of marginal spinules. Colour pale reddish. L. 9 7, C 6 mm. Arctic Ocean and North-Atlantie (North America, Scandinavia). Depth 94-282 m. 43. Gen. Chironesimus 0. Sars 1891 Chironesimus (Sp. un.: C. debruynii), G. O. Sars, Crust. Norway, v.1 p.108 | 1894 C., T. Stebbing in: Bijdr. Dierk., v.17 p.13. Head, lateral lobes slightly produced, subacute. Side-plate 1 scarcely expanded below, 4 rather considerably. Pleon segment 3, postero-lateral angles acutely upturned. Epistome not projeeting, upper lip forming in front a rather large compressed linguiform lobe. Mandible, molar tapering to a blunt apex, palp rather large, set well forward. Maxilla 1, 2 setae on inner plate, 11 spines ‘on outer, 9 spine-teeth on palp. Maxilla 2, inner plate not very narrow, more than half as long as outer. Maxillipeds, broad outer plates set with minute teeth on inner and apieal margin, 4!" joint of palp not elongate. Gmathopod 1 subchelate, 6" joint shorter and much narrower than 5t", oblong, slightly narrowed towards the short almost transverse palm. Gnathopod 2, 24 joint rather shorter than 5tt, 6tk more than half as long as 5th, widening distally, front margin longer than hind one, palm concave, the curved finger not reaching its outer angle. Peraeopods comparatively slender. Peraeopods 3—5, 24 joint large, 4!" not very robust. Uropod 2, inner branch constricted. Uropod 3 reaching beyond uropod 2, rami longer than peduncle, subequal, lanceolate, outer with small second joint, both carrying spinules and setae. Telson nearly twice as long as broad, cleft more than °/, length, a spinule in each of the blunt rather divergent apices. l species. 1. C.debruynii (Hoek) 1882 Anonyx d., Hoek in: Niederl. Arch. Zool., suppl.1 nr.7 p.44 t.3 £.50—30x | 1893 A. d., A. Della Valle in: F. Fl. Neapel, v. 20 p. 830 | 1891 & 95 Chironesimus d., G.O.Sars, Crust. Norway, v.1l p.109 t.37 £.2; p- 687 | 1894 C. d., T: Stebbing in: Bijdr. Dierk., v.17 p.13. Eyes oblong oval, a little broader below, red. Antenna 1, 1° joint tumid, ridged on inner margin, 24 and 34 very short, flagellum in o with 11 joints, in S with 18 (or more), 1° largest, accessory flagellum with 6 joints, 1° large and somewhat expanded. Antenna 2, ultimate and penultimate joints of peduncle a a flagellum in Q with 15 joints, in G with 20 (or more). Gmatho- pod 1, the 6! joint is as long as the 5t" and papers too much to form a palm (Hoek, not Sars or Stebbing). Peraeopod 5, 24 joint broadly oval, about as long as rest of limb. Colour yellowish white, intestine dark brown, ovaries reddish. L. (JSjuv.?) 20 (Hoek), O0 14 (Sars) mm. Arctic Ocean; North-Atlantie and North-Sea (West-Norway). Depth 94—-240 m. 44. Gen. Eurythenes S. I. Sm. 1865 Eurytenes (Sp. un.: E. magellanicus) (non Arn. Foerster 1862, Hymenoptera!), W.Lilljeborg in: N. Acta Soc. Upsal., ser.8 ©.6 nr.1 p.11 | 1882 Eurythenes, (8.1. Smith in:) Seudder, Nomencl. zool., suppl. L. p.135 | 1884 E., S. I. Smith in: Amer. J. Sci., ser.3 v.28 p.54 | 1891 Euryporeia, G.O. Sars, Crust. Norway, v.1 p.85 | 1893 E., A. Della Valle in: F. Fl. Neapel, v.20 p. 847. u u ne ul A U LU 9 2 er ee Eurythenes, Tmetonyx 73 Body massive. Head, lateral angles little produced. Side-plates not very deep, 1° very small, rounded, not covering the head or the protruding mouth-organs, 5? much broader than deep. Antenna 1, pedunele not very stout, flagellum with many short joints, accessory flagellum well developed. Antenna 2 in © much longer than antenna 1, ultimate joint of pedunele longer than penultimate, flagellum many-jointed. Epistome not defined by an ineision from upper lip, projeeting broadiy rounded in front of mouth- organs. Lower lip with front lobes apically emarginate. Mandible broad, molar large and prominent, palp not very long, affixed a little in front of molar. Maxilla 1, inner plate carrying many setae, outer with the usual 11 spines on oblique apex, palp very narrow, apical spines few. Maxilla 2, inner plate much shorter than outer, both with many setae along inner margin. Maxillipeds normal, the large outer plates not reaching beyond 24 joint of the large setose palp, their inner margin furnished with small nodular teeth. Gnathopod 1 strong, subchelate, 6!" joint rather longer than 5th, almost oblong, a little tapering, palm small, slightly excavate. Gmnatho- pod 2 very slender, subchelate, 6t" joint much more than half length of bih, nearly linear, not produced to form a chela with the minute finger. Peraeopods 3—5 rather short and stout, 24 joint moderately large, 4% some- what expanded and produced. Uropod 3 projecting beyond uropods 1 and 2, rami foliaceous, setose, inner ramus as long as basal joint of outer. Telson long, free from spinules, sharply tapering, celeft deep, not dehiscent. 1 species. 1. E. gryllus (Leht.) 1822 Gammarus g., (H. Lichtenstein in:) Mandt, Observ. Groenl., p. 34 | 1866 Lysianassa g., Goes in: Öfv. Ak. Förh., v.22 p.517 t.36 f.1 | 1884 Burythenes 9.; S.L Smith in: Amer. J. Sei., ser.3 0.28 p.54 | 1891 Euryporeia g., G. O. Sars, Crust. Norway, v.1 p.86 t.30 | 1893 E. g., A. Della Valle in: F. Fl. Neapel, 'v.20 p.848 t.60 f.58 | 1848 ZLysianassa magellanica, H. Milne Edwards in: Ann. Sei. nat., ser.3 v.9 p.398 | 1865 Eurytenes magellanicus, W.Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.6 nr. 1 p.11 t.1—3 f£. 1—22. Back broadly rounded (Sars), last segment of peraeon and 1° —5tk of pleon with a low longitudinal ridge (Lilljeborg), segments 4—7 of peraeon and 1—4 of pleon carinate. Pleon segment 3, postero-lateral angles rounded, segments 3 and 4 with dorsal depression. Eyes very large, irregularly flask-shaped, light orange. Antenna 1, 1° joint not very long, flagellum with 30 joints, 1° large, accessory flagellum with 10 joints,‘1°t* the largest. Antenna 2 twice as long as antenna 1, flagellum slender, setose, 50-jointed. Gmathopod 2 twice as long as gnathopod 1. Telson nearly reaching apex of uropod 3. Colour rosy with yellowish tinge, margin of legs vermilion. L. reaching 90 mm. D Arctie Ocean and North-Atlantie (Finmark, North East of America, Bay of Biscay, Azores), tropical Atlantie (lat. 4° S., long. 18° W.). South-Atlantie (Cape Horn). From Procellaria glaecialis L., from stomachs of sharks, and fished up from great depths. 45. Gen. Tmetonyx Stebb.*) 1891 Hoplony& (non Jam. Thomson 1858, Coleoptera!), G. O. Sars, Crust. Norway, v.1 p.91 | 1894 H., T. Stebbing in: Bijdr. Dierk., v.17 p.9. Epistome more or less projeeting and rounded in front. Antennae 1 and 2 in S with small ealceoli. Mandible, molar large, obliquely truncate, palp affıxed over it, 24 and 34 joints subequal. Maxilla 1, 2 setae on inner plate. *) Nom. nov.; tuntöc, shaped by cutting, övuf, nail. — The name Hoplonys is preoceupied (1858, James Thomson in: Arch. ent., v.2 p. 98). 74 Tmetonyx 11 PR on the broad obliquely truncate outer, several spine-teeth on palp. Maxilla 2, plates rather longer than in Anonyx (p. 53). Maxillipeds, outer plates large, oblong oval, reaching end of 24 joint of palp, which is not specially robust. Gnathopod 1 slender, 3% joint generally longer than 4h, 6th oblong, palm very oblique, rather indistinetly defined, 7% rather long, minutely denticulate, having a secondary tooth on inner margin and a cap over the apex. Gmnathopod 2, 6% joint usually not at all produced beneath the minute finger. Peraeopods 1, rather elongate, 24 joint large. Branchial vesicles usually simple. Ur opod 3 projecting beyond uropod 2, rami minutely dentieulate. Telson oblong, deeply cleft. 8 species. Synopsis of species: 1 Pleon segment 3 little or not at. all produced — 2, Pleon segment 3 acutely produced or upturned — 5. 9 Head, lateral corners rounded — 3. Head, lateral corners not rounded — 4. 3 M Antenna 1, 1st joint of flagellum not very large 1. T.eicada . . .. . p.74 Antenna 1, 1st joint of flagellum very large . . 2. T.miersi.... . p- 75 Head, lateral corners acute, much praiiend; eyes bright U Ne RR BR TEE EN BIN BUS. SE, p- 75 Head, Gnkerad corners quadrate; eyes light red, ER IT N EN EEE Se 4. T.albidus ....p.7 5 Side-plate 1 expanded below . .. 2... 5. T. cicadoides . . . p.75 “ 1 Side-plate 1 not expanded below — 6. Java DIIGRE BE a en BI simmilin 4.5458 p. 76 6 Dyon Wan. a ee Er er 7. T. leucophthalmus p.76 Ey wenn ae Tara 8. T. caeculus . . . . P.76 1. T. cicada (O0. Fabr.) 1780 Oniscus c., O. Fabricius, Fauna Groenl., p.258 | 1888 Anonyx e., T. Stebbing in: Rep. Voy. Challenger, v.29 p.47, 617 | 1893 A.c. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.833 | 1891 Hoplonyx c., G.O. Sars, Crust. Norway, v.1 p. 92 t.32 £.2| 1894 H. c., T. Stebbing in: Bijdr. Dierk., v.17 p.9 | 1845 Anonyx& gulosus, Kroyer in: Naturh. Tidsskr,, ser.2 v.1 p.611 | 1846 3; ‚9., Kroyer in: Voy. Nord, Crust. t.14 f.2a—t | 1866 Lysianassa gulosa, Goös in: Öfv. Ak. Förh., v.22 p.520 | 1851 Anonyx norvegicus, W. Liljeborg in: Öfv. Ak. Förh., v.8 p.22 | 1861 A. bruzelü, A. Boeck in: Forh. Skand. Naturf., Mede 8 p. 643. Head, lateral angles very slightly projecting, slightly rounded. Side- plate 4 expanded in a narrow obtuse lobe. Pleon segment 3, postero- lateral angles almost quadrate, with very short produced point. Eyes angled, narrow linear above, lower arm oval, bright red. Antenna 1in oO, flagellum with 16 joints, 1° not very large, accessory flagellum 7-jointed. Antenna 2 in O, flagellum 28-jointed. Gnathopod 1, 5" and 6t% joints equal in length, palm arcuate, finely serrate, not defined by any trace of angle. Gnathopod 2, 6th joint half as long as 5tk, Uropod 2 with neither ramus constrieted. Uropod 3, inner ramus scarcely longer than basal joint of outer. Telson not quite twice as long as broad, cleft nearly to base, with 2 pairs of dorsal spinules and an apical pair. Colour creamy with tinge of rose and on the back bright apple red; eggs in pouch dark violet. L. Q 18—24 mm. Arctie Ocean; North-Atlantie, North-Sea and Skagerrak (South- and West- Norway, Bohuslän, North Britain, France). Timetonyx 75 2. T. miersi (Stebb.) 1888 Hippomedon m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.681 t.10 | 1898 Anonyx miersü, A. Della Valle in: F. Fl. Neapel. v.20 p. 813. Head, lateral angles rounded. Side-plate 1 narrowed below. Pleon segment 3, postero-lateral angles rounded, almost quadrate. Eyes doubtful. Antenna 1, flagellum with 11 joints, 1° very large, accessory flagellum 4-jointed. Antenna 2 in J, ultimate joint of pedunele longer than penultimate, flagellum 38-jointed. Epistome? Gmnathopod 1, 34 joint not longer than 4%, 6th rather longer than 5!%. Gmathopod 2, 6tt joint not half as long as 5t", apically a little produced. Branchial vesieles, with approximation to Anonyx (p. 53), showing some irregular folds. Uropod 3, inner ramus shorter than basal joint of outer, each carrying-a fringe of very long plumose setae. Telson much longer than broad, cleft about *, of the length, with 2 pairs of marginal spinules and 1 pair in the broad emarginate apices. L. about 12 mm. Bass Strait (Bast Moneoeur Island). Depth 68 m. 3. T. acutus (O. Sars) 1891 Hoplonyx a., G. ©. Sars, Crust. Norway, v.1 p.95 t.33 f.2 | 1898 Anonyx eicada (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 833. - Head, lateral angles much and very acutely produced. Side-plate 1 neither narrowed nor expanded below, 4!" much expanded into a narrow obtuse, lobe. Pleon segment 3, postero-lateral angles scarcely produced, quadrate. Eyes as in T. similis (p. 76). Gnathopod 1, palm straight. Gnathopod 2, 6!" joint fully half as long as 5%, palm obliquely truncate, finger stronger than usual. Uropod 3, rami nearly equal in length. Telson with 2 pairs of dorsal spinules. Eggs in pouch orange-coloured. L. © 13 mm. — Other points in practical agreement with the account given of T. similis (p. 76). North-Atlantie (West-Norway). 4. T. albidus (O. Sars) 1891 Hoplonyx a., G. O. Sars, Crust. Norway, v.1 p.96 t..33 £.3 | 1893 Anonyx a., A. Della Valle in: F. Fl. Neapel, v.20 p. 826. Head, lateral angles nearly quadrate. Side-plate 1 narrowed below, 4th expanded into a short broad quadrate lobe. Pleon segment 3, postero- lateral angles not at all produced, quadrate, 4" deeply depressed dorsally. Eyes large, scarcely prolonged backward as in other species, visual elements indistinet, pigment light red. Antenna 1 in O, flagellum 15-jointed, accessory flagellum 8-jointed. Antenna 2 considerably longer than antenna 1, flagellum 28-jointed. Epistome much projecting, obtusely angled. Gnathopod 1, 6! joint subequal to 5t%, palm indistinctly defined below. Gmathopod 2, 6!" joint more than half length of 5tt, narrow. Peraeopods 3—5 shorter than usual, . 24 joint very large. Uropod 3, rami rather broad, inner shorter than outer. Telson not twice as long as broad, with 2 pairs of dorsal spinules. Colour whitish, not tinged with red, eggs in pouch bright red. L. © 12 mm. Aretie Ocean, North-Atlantie and North-Sea (North- and West-Norway). Depth 150—282 m. 5. T. cicadoides (Stebb.) 1888 Anonyax c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.612 t.4,5 | 1891 A. c., Hoplony« (part.), G. O. Sars, Crust. Norway, v.1 p.92 | 1893 Ichnopus sp.? + A. nugax (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 835. Head, lateral angles a little produced, rounded. Side-plate 1 expanded below, 4% expanded into a rather narrow rounded lobe. Pleon segment 3, postero-lateral angles much produced, acutely upturned. Character of eyes uncertain. Antenna 1 in O, flagellum with 20 joints, 1° not very large, accessory flagellum with 9 joints, 1° not very long. Antenna 2 in ©, ultimate and penultimate joints of peduncle subequal, flagellum 30-jointed. Antenna 2 76 Timetonyx in d, ultimate joint of pedunele longer thän penultimate, flagellum with 50 joints, most with calceoli as in flagellum of antenna 1. Maxilla 1, 10 spine-teeth on apex of palp. Maxillipeds, 5 small spines on apical border of outer plates. Gmathopod 1, 6" joint longer than 5%, palm very oblique and very ill-defined. Gnathopod 2, 6t" joint not half as long as 5t%, narrow, with a little convex palm. Uropod 2, inner ramus strongly econstrieted. Uropod 3, rami narrowly lanceolate, carrying spinules and setae, inner scarcely longer than basal joint of outer. Telson not quite twice as long as broad, cleft nearly to base, with 3 pairs of dorsal spinules, and outer angle of each apex produced into. a small tooth. Some specimens in spirit, of a deep brown colour, others cream-coloured. L. 18 mm. Southern Indian Ocean (Kerguelen Island). Depth 36—228 m. 6. T. similis (O. Sars) 1891 Hoplony« s., G. O. Sars, Crust. Norway, v.1 p. 93 t.33 f.1 | 1898 Anonyx cicada (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 833. Head, lateral angles not rounded. Side-plate 1 narrowed below, 4th expanded into a short, broad, rather squared lobe. Pleon segment 3, postero- lateral angles acutely produced. Eyes angled, upper arm very narrow, lower bulb-like, bright red. Antenna 1 in © rather more slender than in T. eicada (p. 74), flagellum with 20 joints, 1° rather large, accessory flagellum 6-jointed. Antenna 2 in 9 little longer than antenna 1, flagellum 24-jointed. Epistome somewhat more projecting than in T. cieada. Gnathopod 1, 6!% joint a little longer than 5%, palm slightly flexuous, defined by an obtuse angle. Gnathopod 2, 6t joint scarce half as long as 5". TUropod 3, inner ramus distinetly longer than basal joint of outer. Telson about twice as long as broad, deeply cleft, with only 1 pair of dorsal spinules. Pellueid, with faint tinge of pale reddish yellow. L. 14 mm. Arctic Ocean, North-Atlantie and North-Sea (West-Norway, Scotland). Depth 38-—282 m. 7. T. leucophthalmus (0. Sars) 1891 Hoplonyx l., G.O.Sars, Crust. Norway, v1 p.97 t.34 f.1| 1893 Anonyx cicada (part.), A. Della Valle in: F, Fl. Neapel, v.20 p. 833. Head, lateral angles obtusely projecting. Side-plate 1 slightly narrowed below, 4 rather broadly and squarely expanded. Pleon segment 3, postero- lateral angles rather sharply produced. Eyes angled, narrow, without distinet visual elements, pigment whitish. Antenna 1 in Q, flagellum with 18 joints, 1° rather long, accessory flagellum 6-jointed. Antenna 2 in © little longer than antenna 1. Epistome much projecting, evenly rounded. Gnathopod 1, 6 joint as long as 5th, palm flexuous, defined by an indistinet obtuse angle. Gmathopod 2, 6% joint short and broad, not half length of 5", palm transverse,. Peraeopods rather long and slender. Uropod 3, inner ramus scarcely longer than basal joint of outer. Telson not nearly twice as long as broad, with only one pair of. dorsal spinules. Colour pale reddish yellow, pinkish in front. L. © 15 mm. Hardangerfjord and Trondhjemsfjord. Depth to 282 m. 8. T. caeculus (0. Sars) 1891 Hoplonyx c., G. O. Sars, Crust. Norway, v.1l p-98 t.35 £.1 | 1895 Anonyx& cicada (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.833. Head, lateral angles acutely projecting. Side-plate 1 scarcely narrowed below, 4 with expansion short, broad, obtuse. Pleon segment 3, postero- lateral angles acutely upturned, 4" with rounded carina behind the dorsal depression. Eyes wholly wanting. Antenna 1, flagellum with 11 joints, 1° very Tmetonyx, Tryphosites 77 large, accessory flagellum with 4 joints, 1% long. Epistome scarcely projecting in front of upper lip, but defined. from it by distinet ineision. Gnathopod 1, 34 joint less elongate than in other species, 6!" joint as long as 5tk, palm very oblique, finely denticulate, defined by obtuse angle. Gmathopod 2, 6! joint oblong oval, more than half as long as 5tt, palm transverse. Peraeopods rather slender, 7! joint long and narrow. Peraeopod 5, 24 joint very large, as long as rest of limb. Uropod 3, rami narrow, mucroniform, without the marginal setae found in the other species, the outer the longer, with spiniform 24 joint. Telson not nearly twice as long as broad, deeply eleft, with 1 or 2 pairs of dorsal spinules. Body pellueid whitish, unpigmented. L. 9 5 mm. Trondhjemsfjord. Depth about 280 m. 46. Gen. Tryphosites O. Sars 1871 Tryphosa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 117 | 1891 Tryphosites (Sp. typ.: Anonys longipes), &. O. Sars, Crust. Norway, v.1 p.81. Side-plate 1 of uniform width. Pleon segment 3, postero-lateral angles acutely upturned. Antenna 1, accessory flagellum rather small, antennae 1 and 2 subequal in Q, antenna 1 ind long, antenna 2 very long. Epistome produced into an acutely lanceolate process. Mandible with prominent molar, palp slender, affixed scarcely behind it. Maxilla 1, inner plate not very short, otherwise as in Tryphosa (p. 68). Maxilla 2, plates moderately wide, inner plate a little the shorter. Maxillipeds, outer plates large, reaching much beyond 24 joint of palp, fringed with small spine-teeth. Gnathopod 1 slender, subchelate, 6!" joint shorter than 5%, Gmathopod 2 slender, subchelate, 6th joint nearly fusiform, much more than half length of linear 5tk. Peraeo- pods slender, long. Peraeopods 3—5, 24 joint much expanded. Uropod 2, inner branch constrieted. Uropod 3 rather large, inner ramus a little longer than basal joint of outer, both carrying spinules and setae in both sexes. Telson deeply cleft. 1 species. 1. T. longipes (Bate & Westw.) 1861 Anonya Il. + A. ampulla (err., non Cancer a. Phipps 1774!), Bate & Westwood, Brit. sess. Crust., v.1 p.113 f.; p.116 f£. | 1862 A. 1. + A.a., Bate, Cat. Amphip. Brit. Mus., p.79 t.13 f£.4,5 | 1871 T’ryphosa I,, A. Boeck in: Forh. Selsk. Christian., 1870 p.118 | 1891 T’rryphosites l., G. O. Sars, Crust. Norway, v.l p.81 t.28 f.3; t.29 f.1 | 1898 Anonyx I., A. Della Valle in: F. Fl. Neapel, v.20 p.830. Head, lateral angles a little produced, acute. Side-plate 5 much broader than deep. Pleon segment 4 with no dorsal projection. Eyes oval, not very large, light red. Antenna 1 in oO, flagellum with 18 joints, 1° very large, accessory flagellum 5-jointed; flagellum in S 30-jointed. Antenna 2, pen- ultimate joint of peduncle rather expanded, flagellum in © 15-jointed, in C filiform, longer than the body. Gnathopod 1, 6!" joint of uniform width, palm slightly oblique. Peraeopods 1 and 2 very setose on hind margin. Telson only slightly tapering, carrying 3 pairs of marginal spinules and 3 pairs on the truncate apices. Body whitish pellueid. L. 12 mm. Arctie Ocean, North-Atlantic, North-Sea, Skagerrak, Kattegat and Baltie (Norway, Denmark, Great Britain, West-France); Mediterranean. 78 Lepidepecreum 47. Gen. Lepidepecreum Bate & Westw. 1868 Lepidepecreum, Bate & Westwood, Brit. sess. Crust., v.2 p.509 | 1888 L,, T. Stebbing in: Rep. Voy. Challenger, v.29 p.686 | 1891 L., G. O. Sars, Crust. Norway, v.1 p.112 | 1871 Orchomene (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 114. Body carinate, asarule extensively, integument firm, calcareous,. Antennal, 1° joint usually carinate, produced (Fig. 12). Antenna 2 in Q not longer than antenna 1, antepenultimate joint of peduncle rather long, in g flagellum slender, very elongate. Epistome forming a broad compressed plate projecting in front Padändi, of upper lip. Mandible, molar joint ı. slight, palp slender, affıxed far back. Maxilla 1, inner plate with 2 setae, outer with almost trans- verse apex. Maxilla 2, plates rather elongate, inner narrower and a little shorter than outer. a Maxillipeds, outer plates reaching Br re beyond 24 joint of palp. Gmatho- I. 9 er e pod 1 subchelate, 6tk joint narrow. ea ne he tAfter 6, O. Bara.] Gnathopod 2 minutely chelate. [After 6. 0. Bars.) Peraeopods 1 and 2 slender. Peraeopods 3—5, 22 joint large. Uropod 3, rami in O scarcely reaching beyond uropod 2, with few setae or none, in d much larger, densely setose on inner margin (Fig. 13). Telson conically attenuated, cleft (Fig. 13). 5 species. Synopsis of species: f Darina of small extent . : „u... una 1. L. typhlops. . . . p.78 1 | Carina of great extent — 2. Telson not eleft beyond the centre . ..... 2. L. foraminiferum . p.79 2 | Telson cleft beyond the centre — 3. a RR REN DER ME ET 3. L. clypeatum . . . p.79 Peraeopod 5, 24 joint not greatiy produced, down- ward — 4. Side-plate 5 not deeper than broad . ..... 4. L. longicorne. . . p.80 Side-plate 5 deeper than broad ... ..... ER p- 80 = ( 5, 24 joint greatly produced down- ai 1. L. typhlops Bonnier 1896 L. t., J. Bonnier in: Ann. Univ. Lyon, v.26 p- 621 t. 86 £.2. Back somewhat rounded, not carinate, apparently with single exception of pleon segment 4, which is raised into a sharp, apically upward pointing keel, and in C, but not in Q, has a deep transverse sinus. Head very narrow, rostrum small, lateral corners greatly produced into a narrow, somewhat downward directed, apically rounded lobe. Side-plates 1—4 very large; pleon segment 3, postero-lateral corners quadrate. Eyes entirely wanting. Antenna I, 1 joint large, scarcely produced apically, rest disposed at right angles to Ist, flagellum in 9 with 6 joints, with some calceoli, 1 joint longer than other 5 combined, in O with 5 joints, 1° not very long; accessory flagellum very small, 2-jointed. Antenna 2 in J as long as body, ultimate and penultimate joints of nr Fe u ET RE EN gl Sad ri grad m irn + Man Eu a ne De Fa ae ° na a an a gl d Bir u Lepidepeereum 79 peduncle equal, each narrower and a little shorter than antepenultimate; flagellum with many short joints, each with a calceolus. Epistome carinate with 2 successive apices above, below dividing into two keels. Maxilla 1, outer plate apically carrying 12 spines. Gnathopod 1, side-plate said to be almost as long as the remainder of the appendage (but?), 5tk and 6tk joints equal, margins parallel, palm small, well defined. Gnathopod 2 longer, very slender, 6t% joint in- flated at the distal end, which prolongs itself in a rounded lobe beyond the ‚finger. Peraeopods land 2, 5t% joint shorter than 6%, finger long. Peraeopod 5, 8 p J 8 g p 24 joint broader and longer than in preceding peraeopods. Uropods 1 and 2 with few spines on the rami; uropod 3, outer ramus 2-jointed, fringed in S, notin ©, with long setae on inner margin, inner ramus carrying 3 spines and 2 setae. Telson long, deeply eleft, with a pair of apical spinules. L. about 6 mm. Bay of Biscay. Depth 650—950 m. 2. L. foraminiferum Stebb. 1888 L. f., T. Stebbing in: Rep. Voy. Challenger, v.29 p.686 t.24 | 1893 Anonyac longicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.814. Carina extending from 24 joint of antenna 1 to pleon segment 4, on peraeon segments 6 and 7 and pleon segments 1—3 the ridge forming a small distal tooth. Head slightly rostrate, lateral angles outdrawn into long narrow lobes ending obtusely.“ Side-plate 5 with breadth and depth sub- equal. Pleon segment 3, postero-lateral angles acute, slightly upturned, segment 4 forming a strong upturned carinal tooth. Eyes not perceived. Antenna 1 inO, flagellum with 5 joints, 1° not very large, accessory flagellum 2-jointed; in CO, flagellum with 6 joints, 1% large, accessory flagellum 3-jointed, slender. Antenna 2 in O, ultimate joint of pedunele shorter tkian either of the preceding, in © rather longer than either; flagellum in © with 5 joints, ind with many. Epistome projecting. Gnathopod 1, 6" joint nearly as long as Stk, of uniform width, palm slightly concave and oblique. Gmnathopod 2, 6tk joint more than half length of 5%, both distally widened. Peraeopods 3—5, 24 joint large, overlapping 34, in peraeopod 5 very large, much longer than rest of limb, . In peraeopods 3—5 4!" joint expanded. Uropod 3, rami rather broad, outer the longer, with setae also in ©. Telson cleft not quite to the centre, with 2 pairs of marginal spinules. L. 5 mm. Southern Indian Ocean (Kerguelen Island). Depth 230 m. 3. L. elypeatum Chevreux 1888 L.c., Chevreux in: Bull. Soe. zool. France, v.13 p.40 | 1895 Anonyx longicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.814. Q. Carina as in L. umbo (p. 80). Head, lateral angles little produced, acute. Side-plate 5 of equal breadth and depth. Pleon segment 3, postero- lateral angles acute, carina of this and segment 4 produced into a sharp strong tooth. Eyes inconspieuous. Antenna 1, 1° joint very stout, produced over half length of 24. Antenna 2 subequal to antenna 1, flagellum in both short, with long eilia. Gmnathopod 1, 6 joint a little longer than 5th, palm oblique. Gmnathopod 2, 6*2 joint half length of 5t, distally dilated, angle of palm produced. Peraeopods 3 and 4, 24 joint expanded, serrate on front margin, produced below 34 joint, 4! much dilated and produced. Peraeopod 5, 24 joint very large, produced almost to the end of the 6% joint. Telson very elongate, cleft to the base. L. 5mm. — d unknown. North-Atlantie (lat. 46° N.). Depth 180 m. 80 Lepidepecreum 4. L. longicorne (Bate & Westw.) ‚1861 Anonyax longicornis, Bate & Westwood, Brit. sess. Crust., v.1 p.91 f. | 1862 A.l., Bate, Cat. Amphip. Brit. Mus., p.72 t.11 f.4 | 1893 A.l. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.814 t.60 £.47—49 | 1888 Lepidepecreum longicorne, T. Stebbing in: Rep. Voy. Challenger, v.29 p.373 | 1868 L. carinatum + Anonya longicornis, Bate & Westwood, Brit. sess. Crust., v.2 p. 509, 510f. | 1891 & 95 L. c., G. O. Sars, Crust. Norway, v.1 p.113 t.38 f.2; t.39 £.1; p.687 | 1890 L. mirabile, Meinert in: Udb. Hauchs, v.3 p.153 t.1 f. 7—12. Dorsal carina extending from 24 joint of antenna 1 back to 4t" segment of pleon. Head slightly rostrate, lateral angles produced to large slightly deflexed linguiform lobes. Side-plates 4—6 carinate near the base, 5th quadrate, not deeper than broad. Pleon segment 3, postero-lateral angles quadrate, dorsal carina of this and of segment 4 acutely produced. Eyes oval, larger in J than in O, reddish with opaque white coating. Antenna 1 inO, 1° joint large, its dorsal carina .jutting out over 24 joint, which on a smaller scale is similar, flagellum short, with 7 joints, 1° not large, accessory flagellum wanting. Antenna 1 in C a little larger, 24 joint scarcely produced, flagellum with 9 joints, 1° very large (Fig. 12). Antenna 2 in © shorter than antenna 1, ultimate joint of peduncle shorter than penultimate or antepenultimate, flagellum 4-jointed. Antenna 2 in GO, ultimate joint of peduncle as long as either of 2 preceding joints, flagellum as long as body. Epistome laxge, nearly rectangular. Gnathopod 1, 6% joint shorter than 5t", of nearly uniform width. Gnathopod 2 very slender, 6! joint more than half length of 5%, oblong triangular. Peraeopod 3, 24 joint rounded, 4% expanded. Peraeopods 4 and 5, 24 joint oval, narrowed below, 4! expanded. Uropod 3, rami very nearly equal (Fig. 13), in © without setae. Telson narrow and long, nearly 3 times as long as broad, deeply cleft, apices elosely adjacent, acute (Fig. 13). Colour chalky white, with dorsal orange patch on each segment. L. 9 7, 0 8 mm. North-Atlantie, North-Sea, Skagerrak, Kattegat and Baltic (South-Norway, Denmark, France, Great. Britain); Mediterranean. 5. L. umbo (Goös) 1866 Lysianassa u., Goes in: Öfv. Ak. Förh., v.22 p. 520 t.37 £.6 | 1871 .Orchomene w., A. Boeck in: Forh. Selsk. Christian., 1870 p.117 | 1882 Lepidepecreum u., G. ©. Sars in: Forh. Selsk. Christian., nr. 18 p.81 | 1891 L. u., G.O. Sars, Orust. Norway, v.1 p.115 t.39 f.2 | 1898 Anonyx u., A. Della Valle in: F. Fl. Neapel, v.20 p. 815. Dorsal carina extending from 1° joint. of antenna 1 to 4" pleon segment. Head, lateral angles acutely produced. Side-plates large and deep, 5t" oval, much deeper than broad, lower hind corner produced downward, the centre forming a conspicuous boss. Pleon segment 3, postero-lateral angles quadrate, minutely produced, carinate process of this and segment 4 acutely upturned. Eyes narrow oblong, red. Antenna 1, only 1° joint produced at apex, flagellum in © with 8 joints, 1° of moderate size, accessory flagellum 3-jointed, very small. Antenna 2 in © nearly as long as antenna 1, flagellum 8-jointed. Antenna of S modified as in L. longicorne. Epistome obtusely rounded in front. Gmathopod 1, 6% joint about as long as 5t", slightly widened distally. Gnathopod 2, 5th joint considerably expanded distally, and 6" rather stouter than in L. longicorne. Peraeopods 3—5, 24 joint not narrowed below, 4 not expanded. Uropod 3, inner ramus notably shorter than outer; outer in Q * carıying 2 setae. Telson oblong triangular, scarcely twice as long as broad, deeply cleft, apices acute. Colour bright carneous red. L. Q 11 mm. Ärctie Ocean, North-Atlantie (Southernmost range, Brönösund [Nordland]). Depth 58—188 m, Orchomenella 81 48. Gen. Orchomenella O0. Sars 1871 Orchomene (part.) + Tryphosa (part.), A. Boeck in: Forh. Selsk. Christian, 1870 p. 114, 117 | 1890 & 95 Orchomenella (part.), G. O. Sars, Crust. Norway, v.1 p. 66; p- 683 | 1894 O., T. Stebbing in: Bijdr. Dierk., v.17 p.6. Side-plates large. Antenna 1, accessory flagellum moderately developed. Antenna 2 in O little longer than antenna 1, in Q' not greatly elongated. Epistome little or not projeeting beyond upper lip. Mouth-organs nearly as in Orchomene (p. 44), molar of mandible rather stronger, outer plate of maxilla 1 more obliquely truneate, inner and outer plates of maxillipeds shorter and palp longer. Gnathopods, peraeopods and uropod 3 in O as in Orchomene, uropod 3 in J nearly the same as in O, telson larger than in Orchomene, oblong triangular, eleft extending beyond the centre, scarcely dehiscent. 5 species. Synopsis of species: 1 f Epistome not at all prominent — 2. \ Epistome rather prominent — 4. Pn| re 1: O,1lsevVis; .: .:» p:8l a Eyes present — 3. 3 { Side-plate 5 scarcely produced downward behind. . 2. O.nanus . . .p.8l Side-plate 5 produced downward behind ..... 3. O. pinguis.. . . p.82 | Side-plate 5 deeper than broad, produced downward 4. O.minuta . . . p.82 Side-plate 5 broader than deep, not produced . 5. ©. groenlandida p. 83 1. O.laevis Bonnier 1896 O.1., J. Bonnier in: Ann. Univ. Lyon, v.26 p.617 1.35 £.5. ‚Pleon segment 4 witn deep dorsal depression. Head, lateral corners sharply produced. Pleon segment 3, postero-lateral corners strongly produced, apparently subacute. Eyes entirely wanting. Antenna 1 in J short, 24 and 34 joints very short, flagellum without calceoli, with 11 joints, 1° not very long, shorter than accessory flagellum. Antenna 2 nearly as long as body, with a calceolus on each joint. Epistome with crest not projecting in front of - upper lip. Lower lip, mandibular processes acute. Maxilla 1, 24 joint of palp with 6 spines on apical margin. Maxilla 2 (in fig.), inner plate shorter than outer. Maxillipeds, outer plates fully reaching end of palp’s 24 joint, inner margin erenulate, apical carrying a spine and 4 setae. Gnathopod 1, 5th joint subequal to 6, 6th oblong, the short oblique palm defined by a spine at the .. angle. Gnathopod 2, 5tk joint not nearly twice as long as the subchelate 6th, Peraeopods 1 and 2, finger longer than 6" joint. Peraeopods 3—5 successively shorter (text, but in fig. 4th the longest), 24 joint oblong oval in peraeopods 3 and 4, much more expanded in peraeopod 5, very broad and longer than the remaining joints combined. Uropods 1 and 2 short, rami as long as peduncle; | uropod 3 much longer, inner ramus with 3 spines on inner margin, outer E much longer, 2-jointed, with 3 spines on outer margin. Telson _ deeply ‚left, with a pair of lateral and a pair of apical spines. L.5 mm. Bay of Biseay. Depth 950 m. [ 2. O. nanus (Kreyer) 1846 Anonyx n., Kroyer in: Naturh. Tidsskr., ser. 2 E »0.2 p.30 | 1846 A.n., Kroyer in: Voy. Nord, Crust. t.17 f.2a—t | ?1893 A.n. (part.), j A. Della Valle in: F. Fl. Neapel, v.20 p.820 | 1871 Tryphosa n., A. Boeck in: Forh. ; Selsk. Christian., 1870 p.117 | 1893 7. nana, J. Bonnier in: Bull. sei. France Belgique, } v.24 p.170, 191 t.7 | 1895 Orchomenella n. (Anonyx namus, laps.!), G. ©. Sars, Crust. 3 Norway, v.1 p. 683 | 1882 Tryphosa eiliata, G. O. Sars in: Forh. Selsk. Christian., nr. 18 F p:-81 t.3 f.4 | 1891 Orchomenella c., G. O. Sars, Crust. Norway, v.1 p.69 t.25 f.2. Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 6 EN a re 82 | Orchomenella Head, lateral angles broadly rounded in Q, narrower in d. Side- plate 1 of uniform width, 5% of equal breadth and depth, lower hinder angle scarcely produced. Pleon segment 3, postero-lateral angles rounded, hind margin smooth, 4 segment with deep dorsal depression. Eyes large, oval, widened below, light red. Antenna 1, flagellum in 9 with 8 joints, in 9 with 12, 1°tlarge and hirsute, accessory flagellum with 3 joints, 1° long, slightly dilated, hirsute. Antenna 2 in Q little longer than antenna 1, in JS about once and a half as long. Epistome flattened in front, not projecting beyond upper lip. Gnathopod 1 rather robust, 6! joint a little longer than 5%, slightly tapering, palm transverse. Gnathopod 2, 6!" joint oval, fully half as long as 5t, obtusely produced beneath the minute finger. Peraeopods 3—5, 24 joint nearly as long as rest of leg. Uropod 3 in Q, inner ramus not longer than basal joint of outer. Telson rather broad, triangular, with 1 pair of marginal spinules, cleft narrow, extending beyond the centre. Colour greyish white. L. Q over 5 mm. 4 North-Atlantie, North-Sea and Fb (South-Norway, France, Holland, Great Britain). 3. O. pinguis (Boeck) 1861 Anonya p., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.642 | 1893 A. p., A. Della Valle in: F. Fl. Neapel, v.20 p. 821 t. 28 f.22—35 | 1871 Orchomene pingvis, A. Boeck in: Forh. Selsk. Christian., 1870 p.115 | 1872 & 76 O.p., A. Boeck, Skand. Arkt. Amphip., v.1t.5 f.1; v.2 p.176 | 1890 &95 Orchomenella p., G. O. Sars, Crust. Norway, v.1 p.67 t.24 f.2; p.683 | 1893 Tryphosa pinguis, J. Bonnier in: Bull. sci. France Belgique, v.24 p. 196. / Head, lateral angles narrowly rounded, produced. Side-plate 1 a little expanded or narrowed (Della Valle) below, 5t" deeper than wide, produced downward behind. Pleon segment 3, postero-lateral angles scarcely rounded, hind margin minutely erenulate or smooth (Della Valle). Eyes narrow, reniform, light red. Antenna 1, flagellum with 8—11 joints, 1° large, hirsute, accessory flagellum with 4 jvints. Antenna 2 in © decidedly longer than antenna 1, flagellum with 15 joints, in S with 20 joints. Epistome scarcely projecting in front of upper lip, defined from it by distinet ineision. Gnathopod 1 rather short and stout, 6% joint much longer than 5t%, tapering to the transverse palm. Peraeopods 3—5, 24 joint shorter than the rest of the limb. Uropod 3, inner ramus scarcely as long as basal joint of outer, which in Q has 3 setae on inner margin. Telson tapering, with 2 pairs of marginal spinules, cleft usually extending beyond the centre, scarcely dehiscent. Colour whitish. L. 9 4—7'5 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Siberia, Baus: and West- Norway, Malangenfjord [Finmark]); Mediterranean. 4. O. minuta (Kroyer) 1846 Anonyx minutus, Kreyer in: Naturh. Tidsskr., ser.2 v.2 p.23 , 1846 A. m., Kreyer in: Voy. Nord, Crust. t.18 f.2a—t | 1893 A. m., A. Della Valle, in: F. Fl. Neapel, v.20 p. 826 | 1866 Lysianassa minuta, Goös in: Öfv. Ak. Förh., v. 22 p. 520 | 1871 Orchomene minutus, A. Boeck in: Forh. Selsk. Christian., 1870 p. 116 | 1893 O. m., J. Bonnier in: Bull. sei. France Belgique, v.24 p. 194 | 1890 & 95 Orchomenella minuta, G. ©. Sars, Crust. Norway, v.1 p.66 t.24 f.1; p.683 | 1895 O. m., Ohlin in: Acta Univ. Lund., v.31 nr. 6 p.22 | 1894 O. minutus, T. Stebbing in: Bijdr. Dierk., v.17 p. 6. Head, lateral angles in. 9 almost quadrate, in e) rather narrow and acute. Side-plate 1 of uniform widtb, 5tk deeper than broad, produced downward behind in triangular lobe. Pleon segment 3, postero-lateral angles a very little produced, hind margin smooth, 4! segment with shallow dorsal “ eg an. —4u 3 Orchomenella, Orehomenopsis "83 depression. Eyes oval, slightly widened below, light red. Antenna 1, flagellum in O with 10 joints, accessory flagellum with 4 or 5. Antenna 2 in 9 little longer than antenna 1, flagellum with 10—12 joints, much longer in S. Epistome slightly projecting in front of upper lip, evenly rounded. Gnathopod 1 not robust, 6! joint scarcely longer than 5t%, palm very slightly oblique. Gmnatho- pod 2, palm produced beneath the minute finger. Peraeopods 3—5 unusually short, 24 joint large, as long as rest of limb, 7*k joint very small. Uropod 3, inner ramus as long as basal joint of outer, which in O has 1 seta on inner margin. Telson nearly twice as long as broad, carrying 2 pairs of marginal spinules, cleft extending beyond the centre, apically dehiscent. Colour pale yellowish red, with orange speck at corners of each segment. L. © 6 (Sars), reaching 11 mm (Ohlin). Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (whole Norway). British and Mediterranean localities remain doubtful. Depth 2—112 m. 5. O. groenlandica (H. J. Hansen) 1887 Anonyx groenlandieus, H. J. Hansen in: Vid. Meddel, ser.4 v.9 p.72 t.2 f.5—5g | 1893 A.g., A. Della Valle in: F. Fl. Neapel, v.20 p.832 | 1891 & 95 Orchomenella groenlandica, G. OÖ. Sars, Crust. Norway, v.1 p.70 t.26 f.1; p. 684 | 1893 Ze J. Bonnier in: Bull. sei. France Belgique, v.24 p. 194. Head, lateral corners slightly projeeting, subangular (Sars), rounded (Hansen). Side-plate 1 narrowed below, 5t% broader than deep, not produced. behind. Pleon segment 3, angles upturned, acute, 4% with deep depression and low carina ending acutely. Eyes oval, widened below, visual elements imperfectly developed, pigment dark red with opaque white coating. Antenna 1, flagellum in 9 with 8, in C with 14 joints, 1° rather large, accessory flagellum with 4 joints, IR long. Antenna 2 in © scarcely longer than antenna 1, not nearly twice as long in d. Epistome considerably projeeting in front of upper lip (as in Orcho- mene, p.44), evenly rounded. Mandible rather stout. Gnatho- pod 1, 6% joint longer than 5tt, scarcely tapering, palm trans- verse. Gnathopod 2 subehelate, 6‘ joint half length of 5th, slightly produced at angle of palm. Peraeopods 3—5 of moderate length, 24 joint large, 4 little widened. Uropod 2, inner ramus constrieted. Uropod 3, inner ramus in © nearly as long as outer, in d somewhat larger, with both rami setose on inner margin. Telson oblong oval, nearly twice as long as broad, with 2 pairs of marginal spinules, eleft narrow, extending beyond the centre. Colour whitish, pellueid. L. 7 mm. Arctic Ocean. Depth 19—94 m. 49. Gen. Orchomenopsis 0. Sars 1891 Orchomenopsis, G. O. Sars, Crust. Norway, v.1 p. 73 | 1893 O., J. Bonnier in: Bull. sei. France Belgique, v.24 p.174. Head, lateral angl&ös rounded. Side-plate 1 expanded below, 4% with rather short obtuse expansion. Pleon segment 3, 47 postero-lateral angles not produced. Antenna 1, pedunele 9 7 / stout, 24 and 34 joints very short, accessory flagellum well nr developed. Antenna 2 notably longer than antenna 1. Epistome Oo. ne not projeeting. Mandible strong, molar weak, much ceiliated, Pleopod with palp set far back, its 1% joint short. Maxilla 1, 2 setae on narrow ""nacula. inner plate, 11 spines on broad obliquely truncate outer plate, many spine-teeth on apex of palp. Maxilla 2, plates rather long and narrow, somewhat acuminate 6* a en nn 6 an hl En Yıund zer 1%; ee a ”, Br Lu were 3 NL. 84 Örchomenopsis apically. Maxillipeds, outer plates oval, with little nodulous teeth on inner margin, length of plates compared with joints of palp a little variable. Gnatho- pod 1 powerful, subchelate, 6" joint eonsiderably longer than 5t®, palm transverse, well defined. Gmathopod 2, 5!" joint rather expanded, 6!" narrower, about half length of 5t%. Peraeopods strong, 24 joint of peraeopods 3—5 moderately expanded, narrowed below. Uropod 3, rami projeeting beyond uropod 2, setiferous. Telson more or less tapering and more or less deeply cleft. 4 species. Synopsis of species: 1 f Cleft of telson not quite reaching the centre... . .. 1. O. musculosa . p.84 eft of telson extending beyond the centre — 2. Cleft of tel ding beyond th -f Gnathopod 2 minutely chelate . ... 2.2... 2. O. abyssorum . p.84 \ Gnathopod 2 subehelate — 3. 3 f Cleft of telson not dehiscent . - . . -» 2.2... 3. O. obtusa . . . p.85 1 Cheit :0f telson -dehiscens. nn rn Ber 4. O.zschauii . . p.85 1. ©. musculosa (Stebb.) 1888 Orchomene musculosus, T. Stebbing in: Rep. Voy. Challenger, ©. 29 p. 673 t.20 | 1891 O. m., Orchomenopsis (part.), G. ©. Sars, Crust. Norway, v.1l p.74 | 1893 Anonyx m., A. Della Valle in: F. Fl. Neapel, v.20 p. 823. Side-plate 5 deeper behind than in front. Pleon segment 3, postero-lateral angles much rounded. Antenna 1, flagellum with 11 joints, 1st large, accessory flagellum with 4 joints, 1° long. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum with 13 joints. Maxilla 1, one palp with 11, the other with 8 spine-teeth. Maxillipeds, inner plates with apieal margin excavate, outer plates reaching beyond 24 joint of palp, with 2 spine-teeth on apical margin. Gnathopod 1, 24 joint short and massive, not longer than 5t" and sth combined, 5" short, cup-shaped, 6!" oblong, thickest near base, hind margin slightly concave, palm transverse, with accurately fitting finger. Gnathopod 2, 6 joint very little apically produced. Uropod 3, rami nearly equal. Telson twice as long as broad, with a pair of dorsal and a pair of apical spinules, eleft not quite reaching centre, slightly dehiscent throughout. L. about 12 mm. North-Paeifie (South of Japan). Surface. 2. O.abyssorum (Stebb.) ?1865 Anonyx chilensis, Cam. Heller in: Reise Novara, v. 2111 Crust. p.129 t.11 f.5 | 1888 Orchomene abyssorum, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 676 t.21 | 1891 O.a., Orchomenopsis (part.), G. O. Sars, Crust. Norway, v.1 p.74 | 1893 Anonyx& a., A. Della Valle in: F. Fl. Neapel, v.20 p.824. Side-plate 5 not deeper behind than in front. Pleon segment 3, postero- lateral angles slightly rounded. Antenna 1 similar to that of O. musculosa. Antenna 2, ultimate joint of peduncle shorter than penultimate, equal to antepenultimate, flagellum with 15 joints. Mandible, 24 joint of palp longer than in OÖ. musculosa, but mouth-organs of the two species in close agreement. Gnathopod 1 similar to that of O. musculosa, but of slighter construetion, the side-plate less expanded below, and the joints more slender. Gnathopod 2, the slender 6!" joint strongly produced at apex to form a little chela with the minute finger. Pleopods, coupling spines very small, yet with 3 retroverted teeth below the terminal hook; 6 or 7 eleft spines on inner ramus (Fig. 14). Uropod 3, outer ramus pretty distinetly longer than inner. Telson nearly twice as long as broad, with 3 pairs of marginal and 1 of apical spinules, eleft extending beyond the middle, dehiscent. L. about 9 mm. South-Atlantie (Buenos Ayres), depth 3578 m; South-Paeifie (Chili). N m. E % > Ri BL". er c I u N IE I" Er, Y t -. AN En E £ x Bahia 2 Er rn a u Ta N ra u 4 5 . . 7 ; N ET " ni D Ei ni = Dr. wi er u. 5 $ Orchomenopsis, Lysianassidarum genera dubia et species dubiae 85 3. O. obtusa O.Sars 1891 & 95 O. o., G. O. Sars, Urust. Norway, v.l p.74 t.26 f.2; p. 684 | 1893 Anonyx obtusus, A. Della Valle in: F. Fl. Neapel, v.20 p. 824, Side-plate 5 not deeper behind than in front. Pleon segment 3, postero- lateral angles smoothly rounded, 4 forming behind the dorsal depression a rounded carina. Eyes rather large, irregularly oval, light red. Antenna 1 nearly as in preceding species, flagellum with 10 joints, accessory flagellum with 5 joints. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum with 18 joints. Maxillipeds, inner plates with apical margin not excavate. Gmnathopod 1, intermediate in robustness between the 2 preceding species, structure similar, except 34 joint slightly longer. Gnathopod 2, 6% joint not suffieiently produced to be considered chelate. Uropod 3, inner ramus very little shorter than outer. Telson about twice as long as broad, regularly tapering, with 6 or 7 pairs of dorsal and marginal and 1 of apical spinules, cleft extending beyond the middle, at. no part dehiscent. Colour uniformly whitish. L.9 12 mm. Trondhjemsfjord, depth at about 188 m; Stavangerfjord, depth 753 m. 4. O. zschauii (Pfeff.) 1888 Anonys z., Pfeffer in: Jahrb. Hamburg. Anst., v.5 p.87 t.2 f.1 | 1893 A.z., A. Della Valle in: F. Fl. Neapel, v.20 p.823 | 1888 Orchomene cavimanus, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.679 t.22 | 1891 O. excavatus (err., pro: cavimanus) + Anonyx zschawii, G.O. Sars, Urust. Norway, v.1 p. 74, 88. Side-plate 5 not deeper behind than in front. Pleon segment 3, postero- lateral angles rounded, 4!" forming behind the dorsal depression a carinate point lifted above the 5th segment. . Eyes large, wider below than above. Antenna l, flagellum with 13—20 joints, accessory flagellum with 5—7 joints. Antenna 2, ultimate joint of pedunele shorter than penultimate, equal to antepenultimate, flagellum with 15—18 joints. Epistome appears to be somewhat projeeting. Maxilla 1 with inner plate elongate, and having (Pfeffer) about 14 spine-teeth on apex of palp. Maxilla 2, inner plate very little shorter than outer. Maxillipeds, inner plates not apically excavate, outer plates scarcely reaching end of 24 joint of palp. Gnathopod 1 nearly as in O. musculosa. Gnathopod 2, 5th joint wide, 6! joint with the little palm excavate, leaving a cavity when the small finger is elosed upon it. Uropod 3, inner ramus considerably shorter than outer. Telson twice as long as broad, with 2 pairs of marginal and 1 pair of apical spinules, cleft extending for */, of the length, dehiscent. L. 10—15°5 mm. South-Atlantie (South Georgia); southern Indian Ocean (Kerguelen Island, depth 228 m). Lysianassidarum genera dubia et species dubiae. Alibrotus M.-E. 1830 Lysianassa (part.), H. Milne Edwards in: Ann. Sci. nat., v.20 p.364 | 1840 Alibrotus (Sp. un.: A. chauseicus), H. Milne Edwards, Hist. nat. Crust., v.3 p.23 | 1846 Halibrotus (nom. emend.), L. Agassiz, Nomenel. zool., Index p.14, 171. Anonyx albus Gosse 1850 A. a. (nom. nud.), A. White in: List Brit. An. Brit. Mus., v.4 p.50 | 1855 A. a., Gosse, Mau. mar. Zool., v.1 p.139 f.261; p. 142 | 1857 A. a., A. White,- Hist. Brit. Crust., p. 169. North-Atlantic (Great Britain). B A. amaurus Giles 1888 A. a. G. M. Giles in: J. Asiat. Soc. Bengal, v. 57 p. 220 1.6 £.1. Blind. Side-plates subequal in depth. Gnathopod 1 strongly subehelate. All limbs short. Colour ivory white. L. 12 mm. Bay of Bengal (Burmah). Depth 2478 m, in water-logged seeds. 86 Lysianassidarum genera dubia et species dubiae A. annulatus Bate 1862 A.a., (Stimpson in MS.) Bate, Cat. Amphip. Brit. Mus., p.79 t.13 £.3. Perhaps belonging to Tryphosa (p.68). L. 6 mm. North-Pacifie (Japan). A. brocchii Catta 1875 A.b., Catta in: Rev. Sei. nat., v.4 p.164. Mediterranean (Marseilles). Depth 25—30 m. A.elegans W. Thomps. 1847 A.e.. W. Thompson in: Ann. nat. Hist., v.20 p. 243. Perhaps identifical with Orchomene batei (p.45). L. 12 ınm. North-Atlantie (Ireland). A. exiguus Stimps. 1853 A. e., Stimpson in: Smithson. Contr., v.6 nr.5 p.51| 1862 A. e., Bate, Cat. Amphip. Brit. Mus., p. 75 t.12 £.3. “ Fundy Bay (Grand Manan). Depth 14—27 m. A.femoratus Pfefl. 1888 A. f., Pfeffer in: Jahrb. Hamburg. Anst., v.5 p. 93 1.2 f.2. Possibly belonging to Onisimus (p.25).” L. about 12 mm. South-Atlantie (South Georgia). A. filiger Stimps. 1864 A. f., Stimpson in: P. Ace. Philad., p. 157 | 1888 A. f., T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 351. To Hippomedon (p. 58)?, or Lepidepeereum (p. 78)? L. 8 mm. Puget Sound. A.indicus Giles 1890 A.i., G.M. Giles in: J. Asiat. Soc. Bengal, v.59 p. 69 t.2 £.5, 5a. If the palp of mandible is really only 2-jointed, the species requires a new genus. L. about 5 mm. Bay of Bengal (Seven Pagodas near Madras). Depth 9—18 m. A. nardonis Heller 1866 A.n., Cam. Heller in: Denk. Ak. Wien, v.2611 p. 26 t.2f.17,18 | 1876 A.n., Tryphosa (part.)?, A. Boeck, Skand. Arkt. Amphip., v.2 p. 180] 1893 A.n., Ichnopus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 836. Exeluded from Anonyx and Tryphosa by the gnathopod 1, from Ichnopus by the antennae; perhaps a Socarnes (p.56). L. 4—5 mm. Adriatie. A.nobilis Stimps. 1853 A.n., Stimpson in: Smithson. Contr., v.6 nr. 5 p.50| 1862 A.n., Bate, Cat. Amphip. Brit. Mus., p. 76 t.12 £.5. Fundy Bay (Grand Manan). Low water mark. A. pallidus Stimps. 1853 A.p., Stimpson in: Smithson. Contr., ©.6 nr. 5 p. 50| 1862 A.p., Bate, Cat. Amphip. Brit. Mus., p. 81. Fundy Bay (Grand Manan). Depth 7—36 m. A. politus Stimps. 1853 A.»p., Stimpson in: Smithson. Contr., v6 nr.5 p.50| 1862 A.p., Bate, Cat. Amphip. Brit. Mus., p. 80. Fundy Bay (Grand Manan). Depth 72 m. A. punctatus Bate 1862 A.p., (Stimpson in MS.) Bate, Cat. Amphip. Brit. Mus., p.78 t.13 f.2. L. 13 mm. Behring Strait. a si ET BT ei N m vr Sa Nie. Se N 3 1 EN LT RL NER Ne He EN 2 ENT ER an EN Da ee ET ee u nn r “ REN Nee NR) 1 eb Fa A ee ea Bad da a N Lysianassidarum genera dubia et species dubiae 87 A.schmardae Heller 1866 A. s., Ichnopus s. + A. filicornis (8), Cam. Heller in: Denk. Ak. Wien, v. 2611 p.21 t.2 f.29--33; p.23 t.3 f. 13—16 | ?1893 I. s., A. Della Valle in: F. Fl. Neapel, v.20 p.808 t.5 £.4; t.27 f.23—-32. Della Valle’s species differs from that of Heller in gnathopod 1, uropod 3 and telson, and is excluded from Ichnopus by the branchial vesicles with accessory lobes on one side only, by uropod 3 with 1-jointed outer ramus and the large 1st joint of flagellam in antenna 1. Adriatie, Gulf of Naples. . A.sp., Bate 1862 A. plautus (err., non Kroyer 1845!), Bate, Cat. Amphip. Brit. Mus., p.78 t.13 £.1. . Approaching to Nannonyx spinimanus (p. 35). L. 5 mm. North-Sea (Seotland). A.sp., Della Valle 1893 A. nanus (err., non Kroyer 1846!), A. Della Valle in: F. Fl. Neapel, v.20 p.820 t.28 f. 36—42. Mediterranean. A.sp., G.M. Thoms. 1832 A, exiguus (err., non Stimpson 1853!), G. M. Thomson in: Tr. N. Zealand Inst., v.14 p. 232 t.118 f.2. Paterson Inlet [Stewart Island near New Zealand]. Depth 14 m. Lysianassa affinis Hasw. 1880 L.a., Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.255 | 1885 L. a., Haswell in: P. Linn. Soe. N.S. Wales, v.10 p.99 t.12 £.5, 6. Perhaps 5 of Lysianassa nitens (p. 88). "Port Jackson [East-Australia]. L. australiensis Hasw. 1880 L. a., Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.323 t.18 f.3 | 1885 L. a, Haswell in: P. Linn. Soc. N.S. Wales, v. 10 p.99 1.12 £.3, 4. Port Jackson [East-Australia]. L. brasiliensis Dana 1852 L.b., J. D. Dana in: P. Amer. Ac., v.2 p.208 | 1853 &55 L.? b., J. D. Dana in: U. S. expl. Exp.. v. 1311 p. 914; t. 62 f. 1a—f. Tropical Atlantie (Rio Janeiro). L. chauseica M.-E. 1830 L.c., H. Milne Edwards in: Ann, Sei. nat., v. 20 p- 865 | 1840 Alibrotus chauseicus, H. Milne Edwards, Hist. nat. Crust., v.3 p. 23. Golfe de St. Malo (Iles Chausay). L.cymba Goes 1866 L.?c., Goes in: Öfv. Ak. Förh., 0.22 p.521 t.38 £.7| 1872 L. c., A. Boeck, Skand. Arkt. Amphip., «.1 p.118 ! 1893 L.c., A. Della Valle in: F. Fl. Neapel, v.20 p. 849. Aretie Ocean (Spitzbergen). Depth 9 m. L.fisheri Lockington 1877 L. f., Lockington in: P. Calif. Ae., v.7 p.48. Behring Sea (Alaska). L. marina Bate 1857 L. m., Bate in: Ann. nat. Hist., ser.2 v.19 p.138 | 1862 L. atlantica (part.), Bate, Cat. Ampkip. Brit. Mus., p. 68 t.10 £.10. Plymouth Sound; North-Sea (Banff). L. martensi Goes 1866 L.m., Gö&s in: Öfv. Ak. Förh., 0.22 p.519 t.37 f.2| 1871 Anonyx m., A. Boeck in: Forh. Selsk. Christian., 1870 p. 109 | 1872 A. m., A. Boeck, Skand. Arkt. Amphip., ®.1 p.156 | 1893 A. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 836. Nearer to Anonyx lilljeborgii (p. 55) than to A. nugax (p.54). L. 75 mm. Arectie Ocean (Spitzbergen). Depth 38 m. ’ > 88 Lysianassidarum genera dubia et species dubiae, Stegocephalidae L. nitens Hasw. 1880 L.n., Haswell in: P. Linn. Soc. N.S. Wales, v.4 p. 255 t.8 £.5/1885 Anonyx n., Haswell in: P. Linn. Soc. N.S. Wales, v.10 p.98 t. 12 £.1, 2| 1893 A.n., A. Della Valle in: F. Fl. Neapel, v.20 p. 886. L. 6 mm. Port Jackson [East-Australia]. Se Sa ee L. woodmasoni Giles 1890 L. w., G. M. Giles in: J. Asiat. Soc. Bengal, v.59 P.68 1.2 £.4. Agreeing in several points with Podoprion bolivari (p.18). L. 8 mm. Macpherson’s Strait (Andaman Islands). Coral sand, depth 30 m. Orchomene grimaldii Chevreux 1890 O©. g., Chevreux in: Bull. Soc. zool. France, v. 15 p. 164. Separated from ÖOrchomene by the entire telson, from Nannonyx by the sub- chelate gnathopod 1, from Onisimus by having the rami of uropod 3 shorter than the peduncle. Mouth-organs not described. Mediterranean (Monaco). Depth 475 m. Be Stenia Dana 1849 $S. (non Guen&e 1846, Lepidoptera, fide: A. Marschall, Nomenel. zool., p.813), J. D. Dana in: Amer. J. Sei., ser.2 0.8 p.136 ! 1852 $. (Sp. un.: $. magellanica), .). D. Dana in: P. Amer. Ac., v.2 p. 209. S. magellanica Dana 1852 S. m., J. D. Dana in: P. Amer. Ac., v.2 p.209 | 1888 Anonys magellanicus, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.266 | 1853 & 55 A. fuegiensis, J.D. Dana in: U. S. expl. Exp., v. 1311 p. 919; t.62 f.4a—p | 1893 A.f.. A. Della Valle in: F. Fl. Neapel, «.20 p. 836. Epistome and telson agree with Onisimus (p. 25), but head and mouth-organs in general and gnathopod 1 with Tryphosa (p. 68). Good Success Bay [Tierra del Fuego]. 2. Fam. Stegocephalidae 1852 Subfam. Stegocephalinae, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.310 | 1853 Subfam. 8.; J. D. Dand in: U.S. expl. Exp., v. 1311 p. 907 | 1882 Stegocephalidae, G.O. Sars in: Forh. Selsk. Christian., nr. 18 p.23 | 1886 Subfam. Lysianassina (part.), Gerstaecker in: Bronn’s Kl. Ordn., v.511 p.499 | 1888 Stegocephalidae, T. Stebbing in: Rep. Voy. Challenger, v.29 p.727 | 1891 S., G..O. Sars, Crust. Norway, v.1 p.196 | 1893 Gammaridi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 620. Head short, retiring. Peraeon broad, deflexed in front. Side-plate 4 large (Fig. 18). _Antenna 1, accessory flagellum 1- or 2-joınted (Fig. 19). Antenna 2 seldom much longer than antenna 1. Upper lip bilobed. Lower lip without inner lobes, Mandible (Fig. 17, 21) without molar or palp, accessory plate on one of the pair. Maxilla 1 (Fig. 15, 20), inner plate with numerous setae, outer usually with 9 prineipal spines. Maxilla 2 (Fig. 16), inner plate very broad and setose, outer narrow. Maxillipeds, plates broad rather than long, last 2 joints of palp narrow. Gmathopods 1 and 2 not subchelate. Peraeopod 3, 24 joint not expanded. Uropod 3 biramous. Telson small. Marine. ne Er a E Br. : 5 9 genera, 12 accepted species, 2 obseure. RL IR ve e StegocephaJidae, Phippsia 2 | 89 Synopsis of the genera: Mandible (Fig. 17, 21) dentieulate — 2. { Mandible not dentieulate — 6. j Telson cleft — 3. \ Telson not eleft — 5. Maxilla 1 (Fig. 15), palp 2-jointed . . . . 1. Gen. Phippsia. .... . p- 89 Maxilla 1, palp 1-jointed — 4. Peraeopod 4, 24 joint expanded. . . . . o 2. Gen. Stegocephalus . . . p.90 Peraeopod 4, 2d joint not expanded. . . 3. Gen. Stegocephaloides, . p.91 4 b) > Maxillipeds, inner plates of normal size . 4. Gen. Andaniopsis. . . . p.92 | Maxillipeds, inner plates very short . . . 5. Gen. Andaniella . .. .p.9% Telson not cleft — 7. | Telson celeft — 8. Maxilla 1, palp 2-jointed . .. ..... 6. Gen. Andaniexis . . . . p.% N Maxilla 1 (Fig.20), palp 1-jointed . . . . 7. Gen. Parandania .. . . p.% Pleon segment 6 very elongate .... . 8. Gen. Andaniotes . . . . P-% | Pleon segment 6 not very elongate . . . 9. Gen. Euandania. ... . p- 97 {er} 1 8 1. Gen. Phippsia Stebb.*) 1793 Subgen. Gammarellus (part.), J. F.W. Herbst. Naturg. Krabben Krebse, v.2 p.106 | 1891 Aspidopleurus (non F.J. Pietet & A. Humbert 1866, Pisces!), G. O. Sars,. Crust. Norway, v.1 p.203 | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p. 632. Side-plate 4 immensely expanded, overlapping side-plates 5 and 6. Eyes wanting. Epistome projecting as rounded compressed lobe. Upper lip slightly and centrally notched. Lower lip, lobes narrow, not Fr strongly dehiscent. Mandible, 2 outer eutting edge narrow, finely pinte }_ plate dentate. Maxilla 1 (Fig. 15), inner plate setose on inner margin ofnarrowed distalhalf, FR palp very small, but 2-jointed. P. gibbose. Maxilla 2 (Fig.16), inner plate Maxilla ı. long, distally rather widened, Fig. ı6. P. gibbosa. oe outer plate wide apart, linear, en tipped withlonghooked spines. Maxillipeds, inner plates narrow, obliquely truncate, outer reaching beyond. acutely produced 24 joint of palp. Gnathopod 1 rather stouter than gnatho- pod 2. Peraeopod 4, 24 joint linear. Peraeopod 5, 24 joint expanded. Uropod 3, rami lanceolate, unarmed. Telson oval, more or less cleft. 2 species. Synopsis of species: - Hs wich amnte sim... 2. ee 1. P. ampulla. . . p.89 Head without distinet rostrum . .. .».. 2 2 2 2.2.2. 2. P. gibbosa . . . p.90 1. P, ampulla (Phipps) 1774 Cancer a., Phipps, Voy. North Pole, p.191* t.12 f.3 | 1781 Gammarus a., J. C. Fabrieius, Spee. Ins., v.1 p.515 | 1793 Cancer (Gamma- rellus) a., J. F.W. Herbst, Naturg. Krabben Krebse, v.,2 p. 116 t.35 f.1 | 1840 Lysia- nassa? a., H. Milne Edwards, Hist. nat. Crust., 0.3 p.22|1866 Stegocephalus a. (part.), Go&s- *) Nom. nov. After Constantine John Phipps. — The name Aspidopleurus is preoccupied (1866, F. J. Pietet & A. Humbert, Poiss. foss. Liban, p. 107). Ai tr; 90 : Phippsia, Stegocephalus ‚in: Öfv. Ak. Förh., 2.22 p.521 t.38 f.9 (not f.8) | 1893 Aspidopleurus a., A. Della Valle in: F. Fl. Neapel, v. 20 p. 633 t. 59 f.45 | 1880 Stegocephalus kessleri (nom. nud.), Stuxberg in: Bih. Svenska Ak., v.5 nr.22 p.65, 72 | 1882 S. k., Stuxberg in: Vega-Exp., v.1 p.713 £. | 1891 $.k., Aspidopleurus (part.)?. G.O. Sars, Crust. Norway, v.1 p. 204. Head with conical acute down-bent rostrum. Side-plate 4 with the great backward expansion moderately deep. Pleon segment 3 not dorsally produced, postero-lateral corners much ceurved upward to a subacute point. Mouth-organs undescribed. Peraeopod 4, the narrow 24 joint with lower hind corner ending in a little rounded lobe (Goös). Telson oval, a little longer than broad, cleft dehiscent, not quite reaching the middle. Colour almost white (J. ©. Fabrieius). — L. attaining 565 mm. Arctie Ocean. 2. P. gibbosa (0. Sars) 1882 Stegocephalus gibbosus, G.O.Sars in: Forh. Selsk. Christian., nr. 18 p.85 t.3 £.7 | 1891 Aspidopleurus g., G. O. Sars, Crust. Norway, v.1 p-204 t.71 f.1) 1893 A. g., A. Della Valle in: F. Fl. Neapel, v.20 p. 634 t.59 f.46, 47. Head without rostrum. Side-plate 4 with lower margin horizontal, backward expansion very deep, rounded behind. Pleon segment 3 produced at the end dorsally to a gibbous projection, pointed at the tip, postero- lateral corners quadrate below, acutely upturned above. Antenna 1, 1° joint of peduncle scarcely longer than 24 and 34 combined, flagellum with 6 joints, 1° not very elongate, accessory flagellum small. Antenna 2 subequal to antenna 1, ultimate joint of pedunele rather longer than penultimate. Gnatho- pods 1 and 2, 6" joint narrow, tapering, scarcely longer than 5t". Peraeopod 4, 24 joint withlower hind angle rounded, not produced. Peraeopod 5, 24 joint oblong, slightly widened distally, rounded end overlapping 34 joint. Telson a little longer than broad, celeft dehiscent, not nearly reaching the middle. Colour uniformly milk white. L. © 8 mm. North-Atlantie(West-Norway). Among living Lophelia prolifera (Pall.). Depth226m. . 2. Gen. Stegocephalus Kroyer 1842 Stegocephalus (Sp. un.: 8. inflatus), Kroyer in: Naturh. Tidsskr., v.4 p.150 | 1891 8., G.O.Sars, Crust. Norway, v.1 p.197 | 1893 $. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 626. Head more or less rostrate. Side-plate 4 deep, completely overlapping the 5t", Jower margin evenly curved. Eyes wanting. Antenna 1 with bundles of sensory setae on flagellum, accessory flagellum with 24 joint . minute. Epistome flattened in front. Upper lip deeply and unsymmetrically bilobed. Lower lip, lobes dehiscent with in- kann. curved apical tooth. Mandible (Fig. 17), eutting edge coarsely dentate, accessory plate of left mandible finely serrate. Maxilla 1, inner plate fringed with setae all along oblique upper margin, Ng outer carrying about a score of spines, palp 1-jointed, tipped with a few spines. Maxilla 2, inner plate broad, with numerous d spines, outer linear, standing apart, tipped with short hooked Fig. 17. spines. Maxillipeds, plates apically rounded, outer large, broad, a S. inflatus. sliohtly serfate on inner margin, not reaching beyond 24joint: De ine N 2of palp. Gnathopod 1 rather stouter than gnathopod 2, 6% joint narrow in both, tapering only in gnathopod 2. Peraeopods 4 and 5, 24 joint expanded. Uropod 3, rami lanceolate, minutely dentieulate, Telson triangular, cleft, unarmed. 2 species. zu KB a a run nn seinen & Far. 2 I 3 Norway, v.1. p.201 | 1893 8. (part.), A. Della . Stegocephalus, Stegocephaloides 9] Synopsis of species: Pleon segment 3, lower margin serrate, hinder smooth. . . . 1. S.inflatus. . p.91 Pleon segment 3, lower margin smooth, hinder serrate. . . . 2. 8.similis.. . p.91 1. S.inflatus Kroyer 1842 S.i., Kroyer in: Naturh. Tidsskr., v.4 p.150 | 1845 $.i., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.522 t.7 f£.3 | 1887 S.i., H.J. Hansen in: Dijmphna Udb., p.218 t.21 £.10—10e | 1888 S.;., T. Stebbing in: Rep. Voy. Challenger, ©.29 p. 728, 1721 t.187a | 1891 S.:., G. O. Sars, Crust. Norway, v.1 p.198 t.69 | 1893 S.i., A. Della Valle in: F. Fl. Neapel, v.20 p. 627 t.59 f. 32—34 | 1855 S. ampulla (err., non Cancer a. Phipps 1774)), T. Bell in: Belcher, Last aret. Voy., v.2 p.406 t.35 f.1| 1866 S..a. (part.), Goes in: Ofv. Ak. Förh., v.22 p.521 t.38 f.8 (not £. 9). Head with deflexed rostrum reaching end of 1° joint of antenna 1, lateral corners rounded, somewhat projeeting. Peraeon segment 1 not so long as 24 and 39 combined. Side-plate 4 twice as deep as segment, as broad as side-plates 1—3 combined. Pleon segment 3, lower margin serrate, hinder smooth, angles acute. Antenna 1, 1° joint nearly twice as long as 24 and 34 combined, with slight setulose expansion; flagellum with 12-joints, 1! not elongate, shorter than accessory flagellum. Antenna 2 rather longer than antenna 1, ultimate joint of pedunele longer than penultimate, flagellum slender, subequal to pedunele. Gnathopod 1, 6" joint as long as the slightly dilated dth, Gnathopod 2, 6 joint sublinear, longer than 5%. Peraeopod 4, 24 joint oblong quadrangular, lower hind corner quadrate. Peraeopod 5, 24 joint much expanded, hind margin very convex, serrulate, lower corner acute. Uropod 3, rami nearly twice as long as peduncle. Telson nearly twice as long as broad, ending acutely, eleft beyond centre. Colour yeilowish with brown patches, legs and antennae banded. L., fully extended, 47 mm in rare instances. Arctie Ocean; North-Atlantice (West-Norway, Shetland Isles, Nova Scotia). Depth 188—376 m. 2. S.similis O.Sars 1891 8.s., G. O.Sars, Crust. Norway, v.1l p.200 1.70 £.1| 1893 S. s., A. Della Valle in: F. Fl. Neapel, 0.20 p. 627 t.50 f. 35. N Head with very short obtuse rostrum, lateral corners rounded, very slightly projecting. Peraeon segment 1 longer than 24 and 34 combined. Side-plate 4 not nearly twice as deep as segment, nor as broad as side-plates 1—3 combined. Pleon segment 3, lower margin smooth, hinder serrate, angle not produced. Antenna 1 as in S. inflatus, but flagellum with 9 joints, 1° longer than accessory flagellum. Antenna 2 scarcely longer than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum shorter than pedunele. Gnathopod 1, 5tk joint much dilated, shorter than 6!", Peraeopods 4 and 5, 24 joint oval, longer in 5% pair than in 4. Uropod 3 as in S. inflatus. Telson not nearly twice as long as broad, ending subacutely, cleft beyond centre. Straw-coloured, mottled with brown and reddish spots. L. © 12 mm. Arctie Ocean and North-Atlantie (West- 1 Norway). Often but not always with S. inflatus. 3. Gen. Stegocephaloides 0. Sars 1891 Stegocephaloides, G. O. Sars, Crust. Valle in: F. Fl. Neapel, v.20 p. 629. Like Stegocephalus (p. 90) in mouth- organs and general appearance (Fig. 18), but side-plate 4 with lower and hinder ge r h -th ; Fig. 18. 8. christianiensis, 2. margins meeting in an angle; 6'% smaller Yrmltlaw. tAfter 6: 0 Sars | 92 > Stegocephaloides, Andaniopsis -than 7th, greatly narrowed below. Antenna 1, peduncle rather flattened, flagellum with 4 joints, 1° very large, last spiniform. Gmathopods 1 and 2 subequal and similar, 6!" joint oblong, tapering distally, rather longer than 5, finger very short. Peraeopod 4, 24 joint linear; peraeopod 5, 24 joint large, produced downward in an acute lobe. Uropod 3, rami unarmed. Telson cleft, - 2 species. Synopsis of species: Peraeopod 5, apex of 2d joint not very acute nor produest. Below WR: u. SET 1. 8. christianiensis. . . p.92 Peraeopod 5, apex of 24 joint very aeute, produced uno Velo A, a ee 2: B,.A0XaDE 2 2 2.54 p. 92 1. S. christianiensis (Boeck) 1871 Stegocephalus c.. A. Boeck in: Forh. Selsk. Christian., 1870 p.128 | 1876 8. c., A. Boeck, Skand. Arkt. Amphip., ©.2 p.424 t.8 f.4; t.9 £.1 | 1891 Stegocephaloides 6, @. O. Sars, Crust. Norway, v.1 p.202 t.70 f.2 1893 S. c., A. Della Valle in: F. Fl. Neapel, v.20 p.681 t.59 £.4l. Head with very short rostrum, lateral angles acute (Fig. 18). Side- plate 4 nearly as broad as deep. Pleon segment 3, postero-lateral angles produced, minutely bidentate. Antenna 1, accessory flagellum scarce half as long as laminar 1° joint of flagellum. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum short, 8- or 9-jointed. Peraeopod 5, 24 joint as long as rest of limb, overlapping 4" joint, hind margin serrate, angularly curved, obtusely pointed below. Telson oblong oval, moderately tapering, eleft nearly to the middle. Colour tessellated with angular patches of pigment spots, dark greenish brown. L. © normally 7 mm; North-Atlantie specimens more than twice this size, perhaps therefore a different species (Sars). Aretie Ocean, North-Atlantic, North-Sea and Skagerrak (Bohuslän, South- and West-Norway). Depth 38—188 m. 2.8. auratus (0. Sars) 1882 Stegocephalus a., G. O. Sars in: Forh. Selsk. Christian., nr.18 p.86 t.3 f.8 | 1891 Stegocephaloides a., G. O. Sars, Crust. Norway, v.1 p.203 t.70 £.3 | 1893 S.a., A. Della Valle in: F. Fl. Neapel, v.20 p.631 t.59 f.42. Head with minute rostrum, lateral angles narrowly rounded.. ‚Side-plate 4 much deeper than broad. Pleon segment 3, postero-lateral angles produced, minutely serrate. Antenna 1, accessory flagellum more than half as long as 1° joint of peduncle. - Peraeopod 5 short, 24 joint much longer than rest of limb, overlapping 5t" joint, hind margin serrate, smoothly curved, acutely pointed below. Telson subtriangular, sharply tapering, cleft beyond the middle. Colour semipellueid, with broad orange band round the middle. L. © 5 mm. Arctic Ocean, North-Atlantie and North-Sea (North- and West-Norway). Solitary, in depths of 150—876 m. 4. Gen. Andaniopsis 0. Sars 1871 Andania (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.128 | 1891 Andaniopsis (Sp. un.: A. nordlandica), G. O. Sars, Crust. Norway, ®.1 p. 208. Side-plate 4 broad, completely overlapping side-plate 5. Eyes distinct, small. Antennae 1 and 2 subequal; antenna 1, flagellum 4-jointed. Epistome rounded in front. Upper lip unsymmetrically bilobed. Mandible, eutting edge straight, finely denticulate Maxilla 1, inner plate with many setae, outer rather narrow, palp small, 1-jointed. Maxilla 2, inner plate short, broad, with many setae or spines, outer short, sublinear, tipped with spines. HE u rien a Tr ae un 5, 4 U 73 - 2 es TEE ET ER DER Fate TE Sen Era air 1 EEE Zr Rn Zee a NT EN nn ee Y - Andaniopsis, Andaniella 93 Maxillipeds, inner plates transversely truncate, reaching end of palp’s 1° joint, ‚outer rather large, finely spinulose inside, palp very slender. Gnathopods 1 and 2 similar, 6!" joint narrow, tapering, rather longer than 5t", finger slight, smooth. Peraeopod 4, 24 joint a little dilated below. Peraeopod 5 much shorter than preceding pairs, 24 joint greatly expanded, decurrent lobe obtusely pointed, 4t!h joint expanded, decurrent. Uropod 3, rami narrow, unarmed, outer 2-jointed. Telson very small, triangular, entire. l species. 1. A. nordlandiea (Boeek) 1871 Andanian., A. Boeck in: Forh. Selsk. Christian., 1870 p.129 | 1876 A.n., A. Boeck, Skand. Arkt. Amphip., 2 p.428 t.9 f.3 | 1891 Andaniopsis n., G. O. Sars, Crust. Norway. v.1 p.209 t.72 f.2 | 1895 Stegocephaloides nordlandicus, A. Della Valle in: F. Fl. Neapel, v.20 p. 630 t.59 f.40. Head not rostrate, lateral corners quadrate. Peraeon segment 1 scarcely as long as 24 and 34 combined. Side-plate 4 nearly as broad as deep. Pleon segment '3, postero-lateral angles quadrate. Eyes narrow, oblong, white, tinged with red below. Antenna 1, 1° joint of flagellum very large, accessory flagellum scarcely more than half its length. Antenna 2, ultimate joint of peduncle shorter than penultimate; flagellum as long as peduncle. Uropod 3, rami longer than peduncle, 24 joint of outer ramus subequal to 1°t, Telson rather broader than long, apex obtusely pointed. Colour yellowish, transversely banded with mottling of dark brown and reddish spots. L.Q5 mm. Aretie Ocean, North-Atlantie and North-Sea (West-Norway). Depth 38—188 m. 5. Gen. Andaniella 0. Sars 1891 Andaniella (Sp. un.: A. pectinata), G. ©. Sars, Crust. Norway, v.1 p. 210. Side-plate 4 broad, completely overlapping 5t%. Eyes wanting. Antenna 1 longer than antenna 2, flagellum 4-jointed. Epistome produced in front to an acuminate lappet. Upper lip rather wide, unsymmetrically bilobed. Lower lip with the lobes rather narrow (with a bidentate process, Aurivillius), apically rounded. Mandible strong, eutting edge not straight, coarsely dentate. Maxillal, inner plate rather small, with several setae, outer large, with 9 strong spines, palp very small, 1-jointed (with an obseure suture near the base, Aurivillius). Maxilla 2, inner plate short, broad, outer not extremely narrow, with 4 strong apical spines. Maxillipeds, inner plates very short, only reaching base of palp, outer large, reaching much beyond 24 joint of slender, slightly armed palp. Gnathopod 1 shorter than gnathopod 2, 6% joint longer than 5th, finger strong, curved, armed with -spines. Peraeopod 4, 24 joint linear. Peraeopod 5 much shorter than preceding pairs, 24 joint oval, deeurrent part rounded, 4% joint not much expanded or deeurrent. Uropod 3, rami shorter than peduncle, outer 2-jointed, longer than inner. Telson small, triangular, entire. 1. species. 1. A. pectinata (O.Sars) 1882 Andaniap., G. ©. Sars in: Forh. Selsk. Christian., nr.18 p.86 t.3 f.9a,b | 1885 A.p., ©.W.S. Aurivillius in: Vega-Exp., v.4 p. 226 t.7 f. 1—12 | 1888 Stegocephalus pectinatus, T. Stebbing in: Rep. Voy. Challenger, v.29 p-557 | 1891 Andaniella pectinata, G.O.Sars, Crust. Norway, v.1 p.211 t.72 f.3 | 18% Stegocephaloides pectinatus, A. Della Valle in: F. Fl. Neapel, v,20 p. 630 t.59 f 39. Body eapable of rolling up into a ball. Head not rostrate, lateral corners quadrate. Peraeon segment 1 little longer than 24. Pleon segment 3, 94 Andaniella, Andaniexis postero-lateral corners slightly rounded. Antenna 1, pedunele compressed, flagellum, 1° joint longer than other 3 combined, twice as long as accessory flagellum. Antenna 2, ultimate joint of pedunele much shorter than the stout penultimate, flagellum very short. Gmnathopod 1, 6% joint slightly dilated in the middle, finger with 4 spines, Gnathopod 2, 6!" joint sublinear, finger with 2 spines. Peraeopod 5, 24 joint oval, scarcely longer than rest of limb, hind margin smooth reaching middle of slightly decurrent 4tk joint. Telson much broader than long. Colour yellowish, mottled with light brown spots. L. 9 4 mm. Aretie Ocean and North-Atlantie (Norway, Greenland, Spitzbergen). Sometimes in branchial cavity of Ascidians. 6. Gen. Andaniexis Stebb.”*) 1871 Andania (non F. Walker 1860, Lepidoptera!) (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.128 | 1876 A., A. Boeck, Skand. Arkt. Amphip., v.2 p.426 | 1888 A. (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.30 | 1891 A., G. ©. Sars, Crust. Norway, v.1 p.206 | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p. 682. Side-plate 4 not completely overlapping 5t". Eyes distinet, but without any trace of visual elements. Antennae 1 and 2 subequal; flagellum of antenna 1 slender, 5-jointed, accessory flagellum as long as 1° joint of primary. Epistome rounded in front. Upper lip small, slightly emarginate. Lower lip, lobes dehiscent, narrowly rounded with small dentiform process. Mandible broad, eutting edge straight, simple. Maxilla 1, inner plate broad, densely setose, outer with strong dentieulate spines, palp well developed, 2-jointed. Maxilla 2, inner plate short, broad, with many plumose setae, outer short, narrow, with simple setiform spines. Maxillipeds, inner plates reaching little beyond base of palp, obliquely.truncate, outer short, rounded, with curved spinules on inner margin, palp robust, rapidly tapering. Gmnathopod 1 rather robust, 6th joint oblong oval, longer than 5tt, Gnathopod 2, 6t% joint linear, much longer than 5tı, Peraeopod 4, 24 joint moderately expanded, oblong oval, 6th joint long. Peraeopod 5, 24 joint much expanded, partly overlapping the rather small 4 joint. Uropod 3, rami narrow, unarmed, shorter than peduncle, 24 joint of outer ramus much shorter than 1°. Telson small, triangular, as long as .broad, entire. l accepted species, 1 incompletely known. 1. A. abyssi (Boeck) 1871 Andania a., A. Boeck in: Forh. Selsk. Christian., 1870 p.129.| 1876 4A.a., A. Boeck, Skand. Arkt. Amphip., 2 p.426 t.9 f.2 | 1891 A.a., G. O. Sars, Crust. "Norway, v.1 p.207 1.71 £.2; 1.72 £.1 | 1898 A.a., A. Della Valle in: F. Fl. Neapel, v.20 p.632 t.59 f. 43—44. Head not rostrate, lateral angles rounded, projecting. Peraeon segment 1 nearly as long as 24 and 39 combined. Side-plate 4 obliquely quadrangular, deeper than broad. Pleon segment 3 smooth, postero-lateral angles produced, not acute. Eyes conspicuous, subquadrate, milky-white. Antenna 1, 1% joint large, somewhat flattened; flagellum, 1° joint rather long, 5t% spiniform. Antenna 2, ultimate joint of pedunele much longer than penultimate, flagellum 9-jointed. Peraeopod 5, 24 joint much longer than rest of limb, hind margin evenly eurved, serrate. Colour brownish grey, with transverse bands of spots, . partly dark greenish. L. © 7 mm. ArcticOcean and North-Atlantie (West-Norway); Christianiafjord. Depth 376—752m. *) Nom. nov. — The name Andania is preoceupied (1860, Franeis Walker, List Lep. Brit. Mus., v.20 p. 57, 223). BI nn 1 eb Pr a Ss RT Andaniexis, Parandania 95 A.spinescens (Alcock) 1894 Andania s., A. Aleock in: Ann. nat. Hist., ser. 6 v.13 p.4ll f. Head concealed under peraeon segment 1; pleon segments 1—4 carinate, apically dentate. L. nearly 40 mm, Bay of Bengal (lat. 10° N., long. 86° E.) Depth 3646 m. 7. Gen. Parandania Stebb. 1899 Parandania (Sp. typ.: Andania boecki), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 206. Side-plate 4 as broad as deep, not deeper than the segment, only in part overlapping the 5tt. Peraeon segment 1 as long as 24 and 34 combined. Pleon rather large. Pleon segment 3, postero-lateral angles produced, not acute. Eyes wanting. Antennae very unequal, flagella 3 many-jointed. Antenna 1, 1° joint of flagellum : and accessory flagellum long (Fig. 19); antenna 2, 3 ultimate joint of pedunele longer than penultimate. 3 Epistome carinate. Upper lip short, emarginate. 4 Lower lip, lobes very broad, distally truncate, with 4 --. Plagelum (entiele at outer corner. Mandible short and broad, S R eutting edge very broad, straight, smooth. Maxilla l, a --- Hagellum inner plate large with a score of plumose setae, outer r plate with 9 spines, palp 1-jointed (Fig. 20). Maxilla 2, ; inner plate broad, with many spines 2 and setae, outer narrow, apically = fringed, and with 2 setules on outer R margin. Maxillipeds, inner plates 2 broad, inflated, setose, not reaching & 8 apex of 1° joint of palp, outer not = E nearly reaching apex of 24 joint of ; palp, fringed with slender spines; _ en E palp’s first 2 joints robust. Gnatho- "°P E RER pod 1 robust, 6% joint oval, tapering en Ban er distally, rather longer thanthestouter nn like gnathopod 1, but longer and less robust, 34 joint in both pairs short. Peraeopods 1—5, 4! joint little expanded, long, except in peraeopod 5. Peraeopod 4, 24 joint oblong oval, slightly decurrent. Peraeopod 5, 24 joint more expanded and decurrent than in peraeopod 4. Uropods 1—3, all the rami subequal, except in the 1°t pair slightly armed, in each pair much shorter than peduncle. Telson a little longer than broad, oval, entire. : i | ‚5th, 7th Jinear, curved. Gmathopod 2 1 species. 1. P. boecki (Stebb.) 1888 Andania b., T. Stebbing in: Rep. Voy. Challenger, v.29 p.735 t.36 | 1893 Stegocephalus boecki, A. Della Valle in: F. Fl. Neapel, v.20 p. 628 t.59 £.36 | 1899 Andania boecki, Parandania sp. typ., T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 206. Head short. Antenna 1 (Fig. 19), pedunele short and thick, flagellum with 14 joints, 1% longer than rest combined, much longer than peduncle, channelled to receive accessory flagellum, which is 1-(2-?)jointed and nearly as long as 15% joint of primary. Antenna 2 much longer than antenna 1, ultimate joint of peduncle more than twice as long as penultimate, flagellum 25-jointed, longer 96 Parandania, Andaniotes than peduncle. Branchial vesicles large, even on peraeopod 5 well developed. Uropods 1 and 2 with numerous spines and setae on peduncles, rami carinate and spinulose. Uropod 3, pedunele unarmed, rami lanceolate, not carinate. L. 22 mm. Tropieal-Atlantie (Pernambuco). Depth 1234 m. 8. Gen. Andaniotes Stebb. 1897 Andaniotes (Sp. un.: A. corpulentus), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.80 | 1897 Andaniodes, J.V. Carus in: Zool. Anz., Bibliogr. v.2 p. 622. Side-plate 4 slightly deeper than broad, overlapping 5t" and part of 6th, Peraeon segment 1 subequal to 24 and 3% combined. Pleon segment 6 longer than 4th or 5th, Eyes wanting. Antennae subequal. Antenna 1, 1° joint of pedunele very thick, longer than 24 and 34 combined, flagellum slender, with 4 joints, 1° longer than 1° of peduncle, 4" spiniform; accessory flagellum very small, 1-jointed. Antenna 2, ultimate joint of pedunele shorter than penultimate, flagellum short. Epistome slightly carinate. Upper lip broader than deep, faintly emarginate. Lower lip, lobes narrow, very widely dehiscent, with minute upright spine at apex. Mandible (Fig. 21), cutting edge straight, smooth, rather broad, tooth-like secondary plate on left mandible. Maxilla 1, inner plate with 7—11 plumose setae, outer with 9 spines, palp 1-jointed, with 7 spines. Maxilla 2, inner plate broad, denseiy fringed with spines and plumose setae, outer narrow, Fig. an. with 9 setae. Maxillipeds, inner plates very broad, with 3 spine- A.corpulentus. teeth but not many setae, outer not nearly reaching end of Left mandible. palp’s 24 joint, fringed with short spines. Gnathopod 1, 24 joint broad, especially in JS, 6!" abruptly narrowed distally, rather shorter and a good deal narrower than the 5t". Gnathopod 2 slender throughout, 34 joint elongate, 5" and 6th joints subequal, 6!" narrowly oval. Peraeo- pods 1-5, 4 joint decurrent. Peraeopod 4, 24 joint oblong, not very widely expanded. Peraeopod 5, 24 joint very broadly oval, as long as rest of limb. Uropod 1--3 in d, peduncle robust, rami very short; uropod 1, outer ramus-thick, inner thin; uropod 3, rami minute, outer 2-jointed, nearly twice as long as inner. In the © uropods 1—3, peduncle less robust, rami all slender, in uropod 3 subequal, nearly as long as pedunele. Telson oval, cleft nearly to middle. 1 species. 1. A. corpulentus (G. M. Thoms.) 1882 Anonysx c., G. M. Thomson in: Tr. N. Zealand Inst., v.14 p.231 t.17 f. 1a—f | 1897 Andaniotes c., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.31 t.8 | 1888 Andania abyssorum, T.'Stebbing in: Rep. Voy. Challenger, v.29 p.739 t.37 | 1893 Stegocephalus a., A. Della Valle in: F. Fl. Neapel, v.20 p.629. Head with small rostrum, lateral eornersrounded, sides produced downward. Pleon segment 3, lateral angles narrowly rounded, dorsum bent, in 9 distally furnished with 2 small humps; segment 6 doubly ridged. Antenna 2, flagellum with 8 joints. Apical narrowing of 6% joint of gnathopod 1 more abrupt in © than in JS; gnathopods 1 and 2 are furnished with various spines and setae, many serrate or plumose. Peraeopod 3, 24 joint scarcely perceptibly dilated. The sexual variation in the uropods is very marked. L. 7 mm. South-Pacifie (New Zealand). Deptlis 2012 (Challenger Exp.), 15 m (G.M. Thomson). R: g De Pi =" u": = 6° je (a a. BP: ze Fi Ei 2 Tu Euandania, Stegocephalidarum species dubiae, Ampeliseidae ‚97 9. Gen. Euandania Stebb. 1899 Euandania (Sp. typ.: Andania gigantea), T. Stebbing in: Ann. nat. Hist, ser. 7 v.4 p. 206. Side-plates much shallower than the segments, 4th yather broader than ‘deep, only in part overlapping 5tl. Peraeon segment 1 as long as 24 and 34 ‚combined. Pleon much smaller than peraeon. Pleon segment 3, postero-lateral ‚angles produced, scarcely acute. Eyes wanting. Antennae not very unequal, flagella many-jointed. Antenna 1, 1° joint of flagellum and accessory flagellum long. Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum _ shorter than in Parandania (p. 95). Mandible widened at the middle, cutting edge broad, straight, smooth, accessory plate of right mandible small. Lower ‚lip, lobes widely, not deeply, dehiscent, broadly rounded, without mandibular ‚processes. Other parts of the mouth as in Parandania, except that setae and spines on inner plate of maxillae 1 and 2 are more numerous, and there are no setules on outer margin of outer plate of maxilla 2. Gmathopods 1 and 2, peraeopods 1—5 and uropods 1—3 nearly as in Parandania. Telson small, ‘oval, celeft less than half its length. » 1 species. 1. E. gigantea (Stebb.) 1888 Andania g., T. Stebbing in: Rep.Voy. Challenger, v.29 p.730 t.35 | 1893 Stegocephalus giganteus, A. Della Valle in: F. Fl. Neapel, v.20 p- 628 t.59 f.37 | 1899 Andania gigantea, Euandania sp. typ., T. Stebbing in; Ann, nat. Hist., ser.7 v.4 p. 206. Head short. Peraeon segments greatly dilated. Antenna 1, peduncle short and thick, flagellum with 14 joints, 1° much longer than peduncle or rest of flagellum, grooved to receive accessory flagellum, which consists of ‚1 joint nearly as long as 1° of primary. Antenna 2, ultimate joint of peduncle much thinner than penultimate, twice as long, flagellum with 25 joints, ‚shorter than peduncle. L. 38—50, height 18—38 mm. South-Paeifie (between lat. 46° and 470 S.). Depths 2926 and 3430 m. Stegocephalidarum species dubia. Stegocephalus latus Hasw. 1880 8$.1., Haswell in: P. Linn. Soc. N.S. W er v4 p.252 .8 f.2| 1885 S.1., Haswell in: P. Linn. So N.S. Wales, v. 10 p.97 t.11 £.7—12 Resembling Stegocephaloides (p. 91). L. about 10 mm. South-Paeifie (Tasmania, New South Wales). 3. Fam. Ampeliscidae 1857 Tetromatides, Bate in: Ann. nat. Hist., ser.2 v.19 p.189 | 1857 Ampeliscades, ‚Bate in: Ann. nat. Hist., ser.2 v.20 p.525 | 1857 Subfam. Ampeliscini, A. Costa in: Mem. Ace. Napoli, v.1 p.173 | 1861 Subfam. Ampeliscides, Bate & Westwood, Brit. sess. Crust., v.1 p.124 | 1865 Subfam. Ampeliseina, W. Lilljeborg in: N. Acta Soc. Upsal., ser.8 v.6 nr. 1 p.18 | 1871 Subfam. Ampeliscinae, A. Boeck in: Forh. Selsk. Christian., 1870 p.220 | 1876 Ampeliscaidae, A. Boeck, Skand. Arkt. Amphip., v.2 p.516 | 1882 Ampeliseidae, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.29 | 1891 A., G. O. Sars, Crust.. Norway, v.1 p. 162. Front of head narrowly truncate, without rostrum. Side-plate 1 setose on lower margin. Pleon segments 5 and 6 coalesced (Fig. 25 p. 108). Eyes ‚frequently 4, exceptionally 6, sometimes 2, or wanting; each eye with or Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 7 TE N EN ERE RE a En e rLt 9; Ampeliseidae, Ampelisca without a lens-shaped thickening of its cornea; sometimes ocular pigment present without lenses. Antenna 1 attached at apex of head, without accessory appendage; antenna 2 far back below. Upper lip helmet-shaped, minutely incised; lower lip 4-lobed. Mandibie (Fig. 28), maxillae 1 and 2, maxillipeds with all the normal parts well developed. Inner plate of maxilla 1 sometimes without setae, sometimes with 1 or 2. Base of maxillipeds fringed with feathered setae and the outer plates armed with strong spine-teeth on inner margin. Gnathopods1 and 2 imperfectly subchelate, the 5t" joint never shorter than the 6%; gnathopod 2 longer and more slender than gnathopod 1 (unless Ampelisca australis be an exception). Peraeopods 1 and 2 (Fig. 22) with 4th joint very large, usually longer and more setose in peraeopod 1 than in. peraeopod 2, 7! joint slender, elongate. Peraeopods 3 and 4, 24 joint very broad, 5th Jong and strongly spined, 6!" and the minute 7!" retroverted. Peraeo- pod 5 (Fig. 23, 26, 27,29) unlike the preceding, varying in the different genera. Branchial vesicles transversely pleated. Cleft of telson (Fig. 24) generally very deep, sometimes minute. Antennae 1 and 2, uropod 3 generally, and occasionally_ peraeopod 5 and telson wery in the two sexes. Glutiniferous apparatus extensive. Marine. 3 genera, 40 accepted and 7 doubtful species. Synopsis of the genera: Peraeopod 5 (Fig. 23, 26), 24 joint without setae between its expansion and the 3d joint, 6th foliaceous, 7th lanceolate, . - . 2.2... l. Gen. Ampelisca . p. 98 \) Peraeopod 5 (Fig. 27, 29), 2d joint with setae | between its expansion and the 3d joint, 6th narrow, 7th spiniform — 2. Oo 2 N A RE ERST EI NEN 2. Gen. Byblis .. . p.111 Peraeopod 5 (Fig. 27), 24 joint much widened | Peraeopod 5 (Fig.29), 24 joint not widened distally 3. Gen. Haploops. . p.116 1. Gen. Ampelisca Kroyer 1842 Ampelisca (Sp. un.: A.eschrichtiti), Kreyer in: Naturh. Tidsskr., v.4 p. 154 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.1035 | 1891 A., G.O.Sars, Crust. Norway, v.1 p.164 | 1893 A. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 469 | 1846 Ampelisia (laps.), Kroyer in: Voy. Nord, Orust. 1.23 f.1 | 1853 Pseudophthalmus, Stimpson in: Smithson. Contr., ©.6 nr.5.p.57 | 1853 Araneops, A. Costa in: Rend. Soc. Borbon., n. ser. v..2 p.169 | 1856 Tetromatus, Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 T., Bate in: Ann. nat. Hist., ser.2 v».19 p.139 | 1887 Amplisca (laps.), Cheyreux in: Bull. Soc. zool. France, v.12 p. 574.- Head with postero-antennal corners obsolete. Side-plate 1 scarcely deeper than 24, often concealing base of antenna 2; side-plate 4 with rare exceptions (as A. odontoplax), obliquely truncated below the posterior angle (Fig. 25). Corneal lenses 4 or none. Mandibular palp with 24 joint generally laminar, 34 ]inear and rather short. Peraeopods 3 and 4 with 24 joint very broad, its front edge strongly eurved in the middle, 5!" joint carrying a simple series of spines within the hinder margin. Peraeopod 5 (Fig. 23, 26), 24 joint variously expanded so that the greatest breadth is sometimes lowest (transversely truncate), sometimes more or less median (obliquely truncate), the margin forming the lower side of the triangle being fringed with plumose setae; the following joints varying much in relative size, the 6! foliaceous, the 7%" lanceolate. Uropod 3 (Fig. 24) reaching considerably beyond the others, rami foliaceous, 4.78 "Yes Fk EP u 2 DEE ea N “ Ze a Sa a a ee eier wei ER reHN RR 7 k UNS Oil Ds ba Da WB 2 a a ad Zn al 0“ le ı a 9 A By SER Ampelisca inner broader than outer. Telson (Fig. 24) oblong, cleft nearly to the base. Two pairs of hepato-pancreatic caeca. 25 species accepted, 7 insuffieciently described. Synopsis of the accepted species: ‚Peraeopod 5, 34 joint shorter than 4th — 2. si Peraeopod 5, 34 joint longer than 4th — 10. Eyes present — 8. Eyes wanting — 8. Pleon segment 3, postero-lateral margin bisi- nuate — 4. x Pleon segment 3, postero-lateral ar not bisinuate — 7. Telson without dorsal setules. . . ..... Telson with dorsal setules — 5. Peraeopod 1, 4th joint with produced distal lobe Peraeopod 1, 4th joint without produced distal lobe — 6. 2 4 5 Pleon segment 4, dorsal carina little elevated 6 | Pleon seginent 4, dorsal carina much elevated Pleon segment 3, postero-lateral angles qua- drate, antenna 1 much shorter than antenna2 Pleon segment 3, postero-lateral angles rounded, antenna 1 not shorter than antenna 2. . Antenna 1, flagellum many-jointed ..... . | Antenna 1, flagellum few-jointed — 9. [ Peraeopod 5, 6th joint longer than 5th .... Peraeopod 5, 6th joint shorter than 5th... . Gnathopod 2 shorter and stouter than gnatho- 1 8 a er ee ee Gnathopod 2 not shorter or stouter than gnathopod 1 — 1. # Antenna 2 very much longer than antenna 1 —18. Cornea not thiekened to a lens — 13. Cornea thieckened to a lens — 15. Antenna 2, ultimate joint of pedunele not longer 0 Antenna 2, ultimate joint of pedunele longer than penultimate — 14. Pleon segment 3, angles slightly produced. . Pleon segment 3, angles not produced aRaae Tome ge 7.02. Corneal lenses small — 16. Pleon segment 4 with elevated earina. . Pleon segment 4, cearina not elevated — 17. 13 14 15 er 6 ‘ Peraeopods 1 and 2, 7th joint not longer than. a EP EN a Re Peraeopods 1 and 2, 7th joint much longer than 5th and 6th — 19. Peraeopods 1 and 2, 7th joint not much longer than 5th and 6th — 20. 18 1. A. eschrichtü . ... 2. A. brevicornis. . . “ 3. A. macrocephala. . 4:4: 81DbAa. 2... ; 0. A: Tann 2 7. A. odontoplax . 8. A. uncinata . . 9. A. abyssicola 10. Alaustralis . .. . Antenna2 not very much longerthan antenna 1— 12. 11. A, rubelle ; -.:.*.. 12. A.amblyops... .‘. 13-3. pusilla. . . 14, A.anomala . .. . 15. A. spinipes 16. A. aequicornis. . 17. A. serraticaudata 7x 100 19 j Head obliquely truneate . .» . 2...» 18. A.diadema . . . . p. 107 \ Head transversely truncate. .. 2... 19. A. acinaces . . . . p.108 00 f Antenna 2 very shot ..» - v2... 20. A. spinimana . . . p.109 | Antenna 2 not very short — 21. i 1. j Cornea not forming a lens. .. 2... 21. A. compacta. . . . p.109 \ Cornea forming a lens — 22. Pleon segment 4, dorsal apex raised above | segment 5 — 23. = | Pleon segment 4, dorsal apes not raised above segment 5 — 24. e 98 j Peraeopod 5, finger not longer than 6th joint 22. A.typica ..... p- 109 \ Peraeopod 5, finger longer than 6th joint . . 23. A. zamboangae . . p.110 4 f Head obliquely truneate.... . 2.2... 24. A. tenuicornis . . . p.110 \.Head transversely truneate. ... .... . Be. ee p. 111 1. A. eschrichtii Kreyer 1842 A.e., Kroyer in: Naturh. Tidsskr., v.4 p.155 | 1891 A.e., A. eschrichti, G. O. Sags, Crust. Norway, ».1 p.174 t.61 f.1 | 1893 A. eschrichtiüi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.475 | 1894 A. e., T. Stebbing in: Bijdr. Dierk., v.17 p.17 | 1862 A. ingens (Pseudophthalmus i. Stimpson in MS.), Bate, Cat. Amphip. Brit. Mus., p.92 t.15 f.2 | 1871 A. dubia + A. eschrichti + A. propingva, A: Boeck in: Forh. Selsk. Christian., 1870 p. 224, 225. Peraeon segments 6 and 7 and pleon segments 1—4 dorsally carinate, composite 5t" and 6!" of pleon with a pair of tubercles flanking an excavation. Pleon segment 3 with margin moderately sinuous over acutely prominent postero-lateral angles. Corneal lenses distincet, lower pair a little removed from lower front corners of head, pigment well defined, bright red. Antenna 1 in Q reaching beyond peduncle of antenna 2, flagellum 2'/, times as long as peduncle, with 30 joints. Antenna 2 twice length of antenna 1, ultimate and penultimate joints of peduncle subequal. Peraeopods 1 and 2, 7! joint con- siderably longer than 5!" and 6% combined. Peraeopod 5, 24 joint longer than all the rest of the leg, produced below the 34, expansion obliquely truncated, and lower corner broadly rounded, 5!" joint projeeting anteriorly, 6% narrow, shorter than 4 and 5% combined, 7!" more than half length of 6%. Uropod 3 with rami lanceolate, fringed with plumose setae and a few spinules. Telson oblong, with a small denticle at the side of each acute apex, without any dorsal spinules.. Body semipellueid, tinged with yellowish, mottled with orange and pinkish pigment. L. reaching 30 mm. Aretie Ocean, widely distributed; Skagerrak (Bohuslän). Depths to 254 m. 2. A. brevicornis (A. Costa) 1853 Araneops b., A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.171 | 1893 Ampelisca b. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.473 - t.4 1.4; 1.37 1.29; 1.38 £.3.5,6,9, 18; 1.43 £.20; t.44 £.26—28; t.45 f.5—10 (but see p.109); t.47 f.5--16 | 1855 A. Iaevigata, W. Liljeborg in: Öfv. Ak. Förh., «12 p-123 | 1891 A.1., G. ©. Sars, Crust. Norway, v.1 p.169 t.59 f.1 | 1856 Tetromatus bellianus, Bate in: "Rop. Brit. Ass., Meet.25 p.58 1.17 £.D5 | 1857 T.b., Bate in: Ann. nat. Hist., ser.2 v.19 p. 139. Pleon segment 3 deeply bisinuated over acutely prominent postero- lateral angles, segment 4 with small dorsal hump at the end. Corneal lenses small, distinet, lower pair at lower corners of head, pigment dark brownish (Sars) or bright red (Della Valle). Antenna 1 in O not (in G scarcely) reaching beyond penultimate joint of peduncle of antenna 2, flagellum with 10 joints, not twice length of pedunele; antenna 2 in Q scarcely more than half length of body, ultimate joint of pedunele much shorter than penultimate. Peraeopod 1, 4% joint et. ._ $- ER re ve 2 - Ampelisca 101 with produced lobe. Peraeopods 1 and 2, 7tk joint considerably longer than 5th and 6 combined. Peraeopod 5, 24 joint shorter than rest of leg, the expansion transversely truncate, reaching end of 34 joint, 4!" completely overlapping the triangular 5!" with a setose lobe behind, 6th oval, broad, as long nearly as the 3 preceding combined, 7% narrowly lanceolate about half length of 6%. Uropod 3 with rather broad foliaceous rami, carrying plumose setae on confronted edges. Telson about twice as long as broad, slightly constrieted near base, triangularly tapering distally, here carrying within each outer margin a row of setules; cleft for */, length. Body whitish, pellueid, mottled with dark brown stars, head and front legs speckled with light yellow. L. 7—9 (Della Valle), 12 mm (Sars). * Aretic Ocean, North-Atlantie, North-Sea and Skagerrak (South- and West-Norway, northwards to Lofoten Isles, British Isles, France); Kattegat; Mediterranean. 3. A. macrocephala Lilj. 1852 A. m., W. Liljeborg in: Öfv. Ak. Förh., v.9 p.7| 1891 A. m., G.O. Sars, Crust. Norway, v.1 p.172 t.60 £.1| 1894 A. m., T. Stebbing in: Bijdr. Dierk., e.17 p.17 | 1874 A. eschrichtii (err., non Kreyer 1842!), Buchholz in: Zweite D. Nordpolarf., v.2 p.375 Crust. t.13 f. 1 | 1893 2 e. (part.), A. Della Valle in: -F. Fl. Neapel, v.20 p. 475. Pleon segment 3 sinuous above acutely prominent postero-lateral angles, segment 4 with dorsal carina little elevated. Corneal lenses very small, distinet, lower pair at lower corners of head, pigment somewhat irregular, bright red. Antenna 1 in O reaching end of peduncle of antenna 2, flagellum twice length of peduncle, 12-jointed. Antenna 2 in O scarcely more than half length of body, ultimate joint of peduncle shorter than penultimate. Peraeo- pods 1 and 2, 7! joint subequal to 5t% and 6! combined. Peraeopod 5, 2% joint subequal in length to rest of leg, expansion transversely truneate, descending below 34 joint with its full breadth instead of in a lobe, 4" joint forming a small setose lobe behind, 5t% carrying 3 long plumose setae on the hinder angle, 6!" equal in length to 4 and 5" combined. Uropod 2, outer ramus with long spine near apex. Uropod 3 with rami broadly lanceolate. Telson oblong oval, with 4 pairs of dorsal spinules and 1 pair at the blunted tip. Body whitish, pellueid, sides mottled with pinkish and yellowish specks. L. 9 14 mm, | rather less. Arctie Ocean; North-Atlantie, North-Sea and Skagerrak (British Isles, whole Norway); Kattegat. 4. A. gibba O.Sars 1882 A.g., G.O.Sars in: Forh. Selsk. Christian., nr. 18 p-107 t.6 £.1, 1a | 1891 A.g., G. O. Sars, Crust. Norway, v.1 p.171 t.59 f.2 | 1893 A. brevicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 473. Pleon segment 3 bisinuate not very deeply. over acute, moderately prominent postero-lateral angles, segment 4 with pronounced dorsal hump at the end. Corneal lenses distinet, lower pair a Nittle behind lower corners of head, pigment well defined, bright red. Antenna 1 in O searcely reaching beyond penultimate joint of peduncle of antenna 2, 24 joint more elongated than in A. brevicornis (p. 100), flagellum with 6 joints, about as long as peduncle; antenna 1 in J not reaching end of peduncle of antenna 2. Antenna 2 in © not quite as long as body, very slender, ultimate joint of peduncle a little shorter than penultimate. Peraeopods 1 and 2, 4 joint narrower than in A. brevicornis, without produced distal lobe, 7 longer than 5!" and 6tk combined. Peraeo- pod 5, 24 joint subequal to rest of leg, expansion transversely truncate, characters of limb as in A. brevicornis, but lobe of 4% joint much smaller with only 102 Ampelisca 3 setae at the tip, the 7*k joint ending in a little curved nail. Uropod 3 with foliaceous rami, not very broad and nearly naked. Telson in Q shorter and broader than in A. brevicornis, otherwise similar, narrow in d. Pellucid, except for a few yellowish specks in front, ova in pouch orange-coloured. L. © 8, 5 7 mm. North-Atlantie, North-Sea and Skagerrak (South- and West-Norway, northwards to Trondhjemsfjord). Depth 94—-282 m, muddy ground. 5. A. chiltoni Stebb. 1888 A.c., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1042 t. 103 | 1893 A. propinqua (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 484. Head transversely truncate. Pleon segment 3 with postero-lateral corners almost quadrate, minutely produced, segment 4 dorsally ending angularly. Corneal lenses 4, lower pair occupying lower corners of head. Antenna 1 in © not reaching end of pedunele of antenna 2, 24 joint scarcely twice length of 1°, flagellum with 9 joints, somewhat longer than peduncle; antenna 2 in O about half length of body, ultimate-joint of peduncle a little shorter than penultimate, flagellum with about 25 joints, not much longer than peduncle. Mandibular palp slender, 34 joint shorter than 24 Maxilla 1 with 2 small setae on inner plate. Peraeopods 1 and 2, 7*k joint longer than 5th and 6 combined. Peraeopod 5 as in A. eschrichtii (p. 100). Uropod 3 as in A. eschriehtii. Telson oblong, with 3 pairs of dorsal spinules and 1 pair in the blunt emarginate apices. L. 15 mm. South-Paeifie (New Zealand). Depth 282 m. 6. A. fusca Stebb. 1888 A. f, T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1052 t.105 | 1893 A. f., A. Della Valle in: F. Fl. Neapel, v.20 p. 483. Head transversely truncate. Side-plates 1—3 with a tooth at lower hind corner, 4% with lower and hind margins at right angles. Pleon segments 3 and 4 slightly carinate, segment 3 with postero-lateral angles gently . rounded. Corneal lenses 4, lower pair removed from lower corners of the head,- projecting from lower margin. Antenna 1 in O longer than antenna 2, 24 joint more than twice as long as 1°, flagellum with 34 joints, much longer than peduncle; antenna 2 nearly as long as the body, ultimate joint of pedunele shorter than penultimate, flagellum with 18 slender joints, shorter than pedunele of antenna 2 and shorter than flagellum of antenna 1. Man- dibular palp with 24 joint rather broad, 3% narrower and shorter. Fig. 22. Fig. 23. Maxilla 1 with 2 small setae on Peraeopod 2. Peraeopod 5. inner plate. Peraeopods 1 and 2 Fig. 22 and 23. A. fusca. (Fig. 22), 7th joint much longer Peraeopods 2 and 5. R % 2 than 5th and 6t" combined. Peraeo- pod 5 (Fig. 23), 24 joint with expansion obliquely and evenly rounded, reaching end of 4th joint, which with its strongly plumose hind lobe is much longer RT, Ampelisca 103 than the 34; the 5tk produced in front is as long as the 4tk; the 6t% is a little longer than the 5tk; the lanceolate 7" ®/, length of 6%. Uropod 3 (Fig. 24) with broad foliaceous rami, plumose on the confronted margins. Telson (Fig.24) nearly _ twice as long as broad, cleft */, length, the distal half triangularly tapering to the acute apices, each carrying a spinule; % on the surface within the margins are Telson -17- 6 or more pairs of setules. The specimens Uropod 3 - in spirit dark coloured, the branchial vesicles in partieular being Zee mIne:; coloured. L. about 13 mm. | Southern Indian Ocean (Cape Agulhas). wia3r KR Tancn. Depth 282 m. Uropod 1ı—3 and telson. 7. A. odontoplax O.Sars 1879 A.o., G. 0. Sars in: Arch. Naturv. Kristian., v.4 p.454 | 1885 A.o., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 196 t. 16 f.4 | 1891 A. o., G.O. Sars,. Crust. Norway, v.1 p.176 t.61 f.2 | 1898 4A. o., A. Della Valle in: F. Fl. Neapel, v.20 p. 485. Head earinate dorsally. Side-plates 1—-3 with distinct tooth at lower hind corner, 4b with hind and lower margins in a continuous eurve. Pleon segments 1—4 with carina, that of 4 ending angularly, postero-lateral angles of 34 segment slightly produced and acute. Eyes none. Antenna 1 in Q about half length of body, rather more than half of antenna 2, 24 joint of pedunele twice length of 1%, flagellum with 32 joints, scarcely twice length of peduncle. Antenna 2, ultimate joint of peduncle shorterthan penultimate. Gnatho- . pod 1, 6% joint a little shorter than 5, Peraeopods 1 and 2, 7 joint considerably longer than 5t" and 6!" combined. Peraeopod 5, 24 joint broad, scarcely as ‚long as rest of leg, expansion nearly transversely truncate, reaching a little below the short 34 joint, 6% longer than 4!" and 5!" combined, 7!" more than half length of 6", narrowly lanceolate. Uropod 2 with rami very spinose on inner margin, and carrying a long terminal spine; uropod 3, rami ‘ lanceolate, fringed with setae and spines. Telson oblong oval, with 2 pairs of dorsal spinules and a spinule in the emargination of each apex. Whitish, pellueid, with no distinet pigmentation. L. © 18 mm. North-Atlantie and Arctic Ocean (Trondhjemsfjord, Helgeland, West-Finmark). Depth 267 m. 8. A. uncinata Chevreux 1887 A. u., Chevreux in: Bull. Soc. zool. France, v.12 p.573 | 1893 A. brevicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 473. Resembling A. gibba and A.brevicornis (p. 101, 100). Head obliquely truneate. Side-plates 1—3 with small tooth at lower hind corner. Pleon segment 3, postero-lateral angles acute and recurved, segment 4 with high compressed carina, ending angularly, following segments slightly cearinate. Eyes none. Antenna 1 not reaching end of penultimate joint of pedunele of antenna 2, 24 joint '/;, longer than 1%, flagellum 10-jointed. Antenna 2 a little longer than the body, pedunele ?/, of whole length, ultimate joint of peduncle a little shorter than penultimate. Peraeopods 1 and 2, 7% joint longer than 5!" and sth combined. Peraeopod 5, 24 joint reaching nearly to middle of 4%; the 4! with curved and angular lobe descending below the 5tk; the 6 hroad and oval; the 7th nearly as long as the 6!%, very strongly ceurved in form of a hook at its extremity. Uropod 3, rami lanceolate, dilated at the base, almost entirely smooth. % ” a ee ee 0 0 104 Ampelisca Telson with 6 or 7 stiff setae on each side, its shape as in A. gibba ©. Colour after long preservation in ‚spirit still keeping a green tint. L. 7 mm. North-Atlantie (Cape Finisterre). Depth 510 m. 9. A. abyssicola Stebb. 1888 A. a@., T. Stebbing in: Rep. Voy. Challenger, e.29 p.1047 t.104 | 1893 A. a., A. Della Valle in: F. Fl. Neapel, v.20 p. 477, Head transversely truncate. Side-plates 1—3 with small tooth at lower hind corner, 4!h with lower and hind margins almost continuous. Pleon segment 3 with postero-lateral corners quadrate, segment 4 impressed and with carina dorsally ending angularly. Eyes wanting. Antenna 1 in O not nearly reaching end of peduncle of antenna 2, 24 joint nearly twice length of 1%, flagellum 10- or 11-jointed, scarcely as long as pedunele; antenna 2 nearly as long as body, ultimate joint of peduncle slightly longer than penultimate. Mandibular palp with 24 joint long and rather broad, 3% much shorter and narrower, but not very narrow. Maxilla 1 with two setae on inner plate. Gnathopod 1, 5th and 6th joints stout. Peraeopods 1 and 2, 7! joint a little longer than 5t" and 6‘h combined. Peraeopod 5, expansion obliquely .rounded, reaching nearly to end of 4th joint, 34 and 4tk joints both short, 5tt longer than both combined, produced downwards in front, 6! oval, eonsiderably shorter than 5tk and scarcely longer than the lanceolate 7%. Uropod 3 with lanceolate rami, serrate on both margins and furnished with spines and plumose setae. Telson not twice as long as broad, deeply cleft, with 4 pairs of spinules within the margins, the apices broad, each with a spinule. L. 16 mm. Tropical Atlantie (Virgin Islands Culebra and St. Thomas). Depth 714 m. 10. A. australis Hasw. 1880 A.a., Haswell in: P. Linn. Soe. N.S.Wales, v.4 p.257 t.9 f.1 | 1882 A.a., Haswell, Cat. Austral. Crust., p.235 | 1885 A.a. (part.?), Haswell in: P. Linn. Soc. N.S.Wales, ©. 10 p.97 t.12 £.7—16; t.13 £.1—4 | 1893 A. a., A. Della Valle in: F. Fl. Neapel, v.20 p. 471. Eyes not mentioned or figured, perhaps but not certainly to be presumed from generie account adopted in Haswell’s Catalogue. Antenna 1 not nearly reaching end of peduncle of antenna 2; antenna 2 about twice as long as antenna 1, ultimate joint of peduncle shorter than penultimate, flagellum with about 10 slender joints. Gnathopod 1, 6t% joint about as long as 5tt. Gnathopod 2 similar to gnathopod 1, but shorter and slightly stouter [?|. Peraeopods 1 and 2, 7tk joint as long as 5tl and 6tk combined. Peraeopod 5 with 4th joint very short and broad, 5% longer than 4 or 6", 7th Jong, slender and slightly curved (measurements agree nearly with those of peraeopod 5 in A. abyssicola). Uropod 3, rami broad lanceolate, the outer armed on one border, the inner on both with slender setae. Telson squamiform, cleft, rounded posteriorly. L. about 9 mm. (Figures of peraeopod 5 given by Haswell 1885 are at variance with the descriptions of 1880, 1882.) Port Jackson, Port Denison and Port Stephens [East-Australia]. Depth 9—11 m. 1l. A. rubella A. Costa 1864 A.r., A. Costa in: Annuario Mus. Napoli, ©.2 p.153 t.2 £.7| 1888 A.r., T. Stebbing in: Rep. Voy. Challenger, v.29 p.346 | 1895 A.r. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.109, 482 t.2 f.4; t.37 £.21; t.38 £. 1,4, 10, 16; 1.45 £.6. Head truncate nearly transversely, but with upper comer a little prominent. Pleon segment 3 moderately sinuous above bluntly projecting postero-lateral angles. Corneal lenses wanting; crimson pigment not very brilliant; rudiments of a 3@ pair of eyes conspicuous. Antenna 1 about as long as antenna 2, peduncle reaching beyond penultimate joint of peduncle of Ampelisea 105 antenna 2, 24 joint not quite twice as long as 1%, flagellum with 20 joints, more than twice as long as peduncle; ultimate and. penultimate joints of antenna 2 equal. Peraeopods 1 and 2, 7" joint shorter than 5tt and 6! combined. Peraeo- pod 5, 24 joint longer than rest of leg, expansion broadly rounded, reaching end of 34 joint, which is longer than 4"; 6% fully as long as 4% and 5th combined, itself short and broad; 7% not much shorter than 6%. Uropod 3 with broad rami. Telson having only a spinule at each apex. Colour deep red (Costa) or pearl-grey, pellueid with a slight tendeney on the appendages to violet (Della Valle). L. 6 mm. Mediterranean. Among algae. ! 12. A.amblyops O.Sars 1891 A.a., G.O.Sars, Crust. Norway, v.1 p. 180 t.63 f.1 | 1893 A. aequicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907, 917. Side-plate 1 not concealing base of antenna 2, 4! having hind and lower margins defined by an obtuse angle. Pleon segment 3 with postero- lateral angles slightly produced, 4 with carina ending in a prominent blunted angle. Corneal lenses absent, but patches of reddish pigment present at the ocular positions. Antenna 1 in Q not much shorter than antenna 2, peduncle reaching beyond penultimate joint of peduncle of antenna 2, 24 joint more than twice as long as 1°, flagellum with 25 joints, twice length of peduncle; antenna 2 not as long as body, ultimate joint of peduncle longer than penultimate. Gmathopod 1, 6!" joint a little shorter than 5%. Peraeopods 1 and 2, 7! joint subequal to 5t" and 6" combined. Peraeopods 3 and 4 comparatively elongate, slender. Peraeopod 5, 24 joint considerably longer than rest of leg, expansion obliquely truncate, reaching to end of 34 joint, which is longer than the 4%, 6th scarcely as long as 4! and 5tb combined, 7tk lanceolate, about half length of 6, TUropod 3 broad, foliaceous, with a few scattered setae. Telson oblong oval, with 2 pairs of dorsal spinules and a pair at the unemarginate apices. Highly pellueid, nearly colourles. L © 8 mm. Christianiafjord and Trondhjemsfjord. Depth 188—282 m. 13. A. pusilla O.-Sars 1891 A.p., G. O. Sars, Orust. Norway, v.1 p.181 t.63 f,2 | 1893 A. aequicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907, 917. Closely approaching A. rubella (p. 104). Front of head obliquely emarginate, lower corner little projeeting. Side-plate 1 not concealing base of antenna 2. Pleon segment 3, lower hind corners quadrate, 4 scarcely carinate in S, more distinetly and with deep anterior saddle-shaped depression in d. Corneal lenses absent, but patches of pigment representing the eyes. Antennae 1 and 2 in O subequal, little more than half length of body; peduncle of antenna 1 reaching beyond penultimate joint of pedunele of antenna 2, 24 joint twice as long as 1°; antenna 2, ultimate joint of peduncle longer than penultimate. Gnathopod 1, 6" joint fully as long as 5t%, Peraeopods. 1—4 asin A. amblyops. Peraeopod 5, 24 joint little longer than rest of leg, expansion broad, obtusely truncated in Q, narrower and more obliquely truncated in d, reaching below the 34 joint, which is longer than the 4!h; 6th Jonger than 4! and 5th combined, 7! more than half the length of the 6. Uropod 3, rami not very broad, slightly armed. Telson without dorsal spinules.. Body whitish, pellueid, with a faint rosy tinge on front of body and side-plate 1. L. © scarcely more than 5 mm. North-Sea, Skagerrak, North - Atlantie and Aretic Ocean (South- and West- Norway, and northwards to Selsövig exactly at the polar eirele). Depth 188—376 m, muddy ground. 106 Ampelisca 14. A. anomala 0. Sars 1882 A. a, G. O. Sars in: Forh. Selsk. Christian., nar.18 p.108 t.6 f.2| 1891 A.a., 6. O. Sars, Orust. Norway, v.1 p.178 t.62 f.2 | 1893 A. aequicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.478. _ Head transversely truneate, emarginate, lower corner acutely produced. Side-plate 1 not eoncealing base of antenna 2. Pleon segment 3, lower hind corners quadrate; 4" with distinet carina ending angularly. Corneal lenses larger but less refractive than usual, lower pair removed from lower corners and lower margin of head, pigment well defined, reddish. Antenna 1 in © considerably more than half as long as the body, peduncle reaching beyond penultimate joint of peduncle of antenna 2, 24 joint twice as long as 1°t, flagellum 30-jointed, 2?/, times as long as pedunele; antenna 2 nearly as long as body, 1'/, length of antenna 1, ultimate joint of pedunele longer than pen- ultimate. Gnathopod 1, 6% joint nearly as long as 5f"; onathopod 2 differing from gnathopod 1 less than usual. Peraeopods 1 and 2, 7*% joint considerably longer than 5 and 6!" combined. Peraeopods 3 and 4 with 5t% joint rather elongate. Peraeopod 5, 24 joint longer than rest of leg, expansion obliquely rounded, not reaching below 34 joint, which is longer than the 4th, 6th fully. as long as 4 and 5% combined, 7! more than half length of 6%. Uropod 3, rami foliaceous, fringed with a few setules. Telson oval, searcely twice as long as broad, without dorsal spinules. Body highly pellueid, nearly colour- les. L. 9 7 mm. North-Sea (Korshavn [West-Norway]), Hardängerfjord, Christianiafjord, North- Atlantie (Cape Finisterre). Depth 188—-376 m. 15. A. spinipes Boeck 1861 A.s., A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 653 | 1876 A. s., A. Boeck, Skand. Arkt. Amphip., v.2 p.526 t.31 £.5 | 1891 A. s, G.O. Sars, Crust. Norway, v1 p.173 t.60 f.2 | 1893 A. aequicornis (part.), A. Della Valle in: F. Fl. Neapel, «.20 p. 478. Head truncate nearly transversely, but with upper corner rather more projecting than lower. Pleon segments 1— 3 slightly carinate, 34 with lower hind corners nearly quadrate; 4" deeply impressed in front and with high rounded carina behind. Corneal lenses small, distinet, lower pair removed from lower ecorners of head; pigment irregular, reddish, partly coated with chalky white. Antenna 1 in Q nearly half as long as body, pedunele just reaching beyond penultimate joint of peduncle of antenna 2, 29 joint not twice length of 1°t, flagellum 32-jointed, about 3 times as long as pedunele; antenna 2 in O 1'/, length of antenna 1, ultimate and penultimate joints of pedunele equal. Gnathopod 1, 6% joint decidedly shorter than 5; gnathopod 2 much more slender than gnathopod 1. Peraeopods 1 and 2, 7b joint equal to 5! and 6th combined. Peraeopods 3 and 4 as usual very spinous. Peraeopod 5, 24 joint as long as rest of leg, expansion obliquely truncated, reaching to end of 34 joint, which is much longer than the 4%; 6tk Jonger than 4 and 5th combined; 7tı ®/, length of 6%. Uropod 3 foliaceous, with short setae on the confronted margins in Q. Telson very narrow, without dorsal spinules, but with 3 marginal spinules near each apex. Semipellucid, light yellowish, with orange shadows and specks, peduncles of antennae with reddish tips. L. © 15 mm, 9 rather less. North-Sea, Skagerrak, North-Atlantie and Arctie Ocean (South- and West-Norway, northwards to Lofoten Isles). Depth 56-188 m. 16. A. aequicornis Bruz. 1859 A.a., R.M. Bruzelius in: Svenska Ak. Handl., n.ser. v.ö nr.1 p.82 t.4 f.15 | 1891 A. aegvicornis, G.O. Sars, Crust. Norway, v.1 p.177 t. 62 f. 1] 1893 A. a@quicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 478. Ampelisca 107 Back not earinate, except slightly at pleon segment 4. Head truncate nearly transversely, but with upper eorner rather more projecting than lower. Side-plate 4 with hind and lower margins defined by an obtuse angle. Pleon segment 3, lower hind eorners quadrate. Corneal lenses small, distinct, lower pair removed from lower eorners of head, pigment well defined, reddish. _ Antenna 1 in 9 very little shorter than antenna 2, pedunele reaching beyond penultimate joint of pedunele of antenna 2, 24 joint twice as long as 1°, flagellum 24-jointed, more than twice as long as pedunele; antenna 2 a little over half length of body, ultimate joint of peduncle longer than penultimate. Gnatho- pod 1, 6th joint shorter than 5t!k; gnathopod 2 much more slender than - gnmathopod 1. Peraeopods 1 and 2, 7th joint scarcely equal to StR and 6th combined. Peraeopods 3 and 4 unusually short and robust. Peraeopod 5, 24 joint longer than rest of leg, expansion broad, obtusely truncate, not reaching end of 34 joint, which is much longer than the 4, 6 shorter than 4! and 5t" combined, 7 broadly lanceolate, more than half length of 6th, Uropod 3, rami foliaceous, fringed with spinules. Telson oblong, a little tapering distally, with 2 pairs of dorsal spinules and 1 Ber at the blunted apiees. L. © 11 mm. North-Sea, Skagerrak and North-Atlantie (South- and West-Norway, northwards to Lofoten Isles, Bohuslän, British Isles). 17. A. serraticaudata Chevreux 1888 A.s., A. serraticandata (laps.), Chevreux in: ©.-R. Ass. Frane., Sess. 17 v.2 p.349 t.6 f.3—9 | 1893 A. rubella (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 482. Head transversely truncate. Pleon segments 1—3 with postero-lateral angles acute, slightly produced, segment 4 without any of the usual gibbosity. Eyes figured as having small corneal lenses. Antenna 1 in oO little shorter than antenna 2, about half length of the body, peduncle reaching beyond penultimate joint of peduncle of antenna 2, 2% joint figured as not longer than 1°, flagellum more than twice as long as peduncle; ultimate joint of peduncle of antenna 2 figured as longer than penultimate. Gmathopod 1, 6 joint sub- equal in length to 5t". Peraeopods 1 and 2, 7% joint much longer than 5% and 6!" combined. Peraeopods 3 and 4 short and robust. Peraeopod 5, 24 joint longer than rest of leg, expansion very obliquely truncate, reaching end of 34 joint, which is longer than the 4; 6th joint not as long as 4 and 5th combined; 7* very short and broad. Uropod 3, rami broad, with plumose setae on the confronted margins, outer ramus eurved at the apex, serrate in the upper part. Telson long, very deeply cleit, with a long spinule at each apex. L. oO 5'5 mm. Mediterranean (Üherchell [Algeria]). 18. A. diadema (A. Costa) 1855 Araneops d., A. Costa in: Rend. Soc. Borbon, nm. ser. .2 p.171 | 1867 Ampelisca d., A. Costa in: Annuario-Mus. Napoli, v.4 p.45 | 1893 A.d. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.479 t.4 f.2; t.37 f.19, 20, 22--28, 30-38; 1.38 f.2,7,8, 11,12, 14, 15; t.40 £.39, 40; t.41 f.23; t.44 f.4, 8,9, 11; t.45 £.17.18; 1.46 4-6; 1.47 f.29; t.48 f.19 | 1862 A. gaimardü (part.), Bate, Cat. Amphip. Brit. Mus., p.91 | 1871 A. assimilis, A. Boeck in: Forh. Selsk. Christian., 1870 p.222 | 1891 A.a., G. ©. Sars, Crust. Norway, ®.1 p.168 t.58 f.2. Head obliquely truncated. Ventral surface of peraeon segments 5 and 6 each carrying a backward directed hook, segment 7 with 2 unequal hooks directed forward. Pleon segment 3 with postero-lateral angles rounded, " segment 4 with slight anterior depression and earina barely indieated (rather high and evenly rounded, Boeck, Sars). Corneal lenses 4, lower pair at ea Sa a A re F a P ? RE - 108 Ampelisca lower eorners of head. Antenna 1 in 9 a little longer than peduncle of antenna 2, 24 joint of pedunele not much longer than 1°, flagellum 10-jointed, about twice as long as peduncle; ultimate joint of peduncle of antenna 2 in d much, in © a little longer than penultimate, flagellum in Q 20-jointed, 1'/, length of peduncle. Peraeopods 1 and 2, 7*% joint much longer (shorter, Boeck) than 5th and 6 combined. Peraeopod 5, 24 joint longer than rest of leg, not reaching end of 34, expansion obliquely rounded, 34 joint longer than 4th, 6th Jonger than 4 and 5tk combined, 7% almost as long as 6, Uropod 3 with rami broad, carrying some feathered setae on the confronted edges. Telson long oval, eleft almost to the base, without dorsal spinules, but with some setules on the margins. Colour greyish, passing into yellow-brown on the sides, with red or violet on sides of pleon and legs. L. 7”—12 mm. Mediterranean; North-Atlantie, North-Sea and Skagerrak (West- and South- Norway, Bohuslän). 19. A. acinaces Stebb. 1888 A.a., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1036 t. 101, 102 | 1893 A. a., A. Della Valle in: F. Fl. Neapel, v.20 p. 476. Head transversely truncate. Side-plates 1 and 2 minutely toothed at lower hind corner, 1° distally much widened, 4b with lower and hind margins forming a very obtuse rounded angle (Fig. 25). Corneal lenses 4, the lower pair behind the obtusely projecting lower | eorners of the head. Antenna 1 in O not nearly reaching end of peduncle of antenna 2, 24 joint about twice length of 1%, flagellum 10-jointed, longer than peduncle; antenna 2 in © as long as the body, ultimate joint of pedunele rather shorter than penultimate, which is longer than whole peduncle of an- tenna 1, flagellum 34-jointed, longer than peduncle. Mandibular palp with 24 joint moderately broad, 3% much shorter and Fig. 25. A.acinaces. Fig. 26. A. acinaces. Lateral view. Peraeopod 5. narrower. Maxilla 1 with 2 small setae on inner plate. Peraeopods 1 and 2, 7% joint much longer than 5! and 6! combined. Peraeopod 5 (Fig. 26), 24 joint with the expansion broad, almost transversely truncate, not reaching end of 34 joint, which is longer than 4th; 5tk joint a little longer than the 4, each of them being lobed in front but not deeply; 6 nearly as long as 3 preceding joints combined; 7! narrowly lanceolate, about ®/, length - of 6%, Uropod 3, rami lanceolate, furnished with spines and setules. Telson 2.20 p.479. Ampelisca 109 distally tapering, with evenly curved margins, within which are planted 5 pairs of setules; a pair of setules adjoin the moderately acute apices. L. 21 mm. Port Jackson [East-Australia]. Depth 63 m. 20. A.spinimana Ühevreux 1887 Amplisca (laps.) s., Chevreux in: Bull. Soe. En zool. France, v.12 p.574 | 1893 Ampelisca diadema (part.), A. Della Valle in: F. Fl, Neapel, v.20 p.479. Head obliquely truncate. Pleon segment 3 with postero-lateral angles slightly produced, almost quadrate; segment 4 slightly carinate in Q, deeply impressed and more strongly carinate in d. Eyes normal. Antenna 1 in Oo extremely short, 1° joint searcely longer than broad, 24 1?/, length of 1%, flagellum 6-jointed. Antenna 2 in Q scarcely '/, length of body, ultimate and ‚penultimate joints of pedunele equal, flagellum 11-jointed. Antenna 2 in d much longer than the body. Gnathopod 1, 6 joint as long as 5tt, armed with long spines and setae on the concave palm. Peraeopods 1 and 2, 7! joint longer than 5!" and 6% combined. Peraeopod 5, 24 joint not quite reaching end of 34, which is armed with 4 spines on the front; 7th joint as long as 6%, Uropod 3 in © with long smooth rami ending in a little spine, the rami in © setose on the confronted edges. Telson cleft almost to the base, with 4 spines at the extremity. Colour uniform pale rose. L. 7 mm. North-Atlantie (Cape Finisterre, depth 510 m; Croisie, depth 15—20 m). 21. A. compacta Norm. 1882 A. c. A. M. Norman in: P. R. Soe. Edinb., v.11 p. 688. ’ Body rounded, compaet. Pleon not carinate, segment 3 with postero-lateral angles acute, not much produced nor upturned, segment 4 with slight saddle- shaped depression. Eyes apparently‘ wanting. Antenna 1 longer than peduncle of antenna 2, flagellum 10-jointed; antenna 2 much longer than antenna 1, ultimate and penultimate joints of peduncle subequal. Peraeopods 1 and 2, 7 joint subequal to 5!" and 6" combined. Peraeopod 5, 24 joint reaching end of 34, expansion transversely truncate, lower margin slightly concave(?), 34 joint much longer than 4*h, Gt" not quite equal to At" and 5 combined, 7tı half length of 6%. Uropod 3 with the rami sparingly ciliated. Telson deeply eleft. L. about 8 mm. North-Atlantic. Depth 968 m. 22. A.typica (Bate) 1856 Tetromalus typicus, Bate in: Rep. Brit. Ass., Meet. 25 p-58 t.17 f.8, DA | 1857 T.t., Bate in: Ann. nat. Hist., ser.2 ».19 p.139 | 1871 Ampelisca typica, A. Boeck in: Forh. Selsk. Christian., 1870 p.222 | 1891 A.t., G.O. Sars, Crust. Norway, o.1 p.165 t.57 | ?1859 A. carinata, R.M. Bruzelius in: Svenska Ak. Handl., n. ser. 0.3 nr.1 p.87 t.4 f.16 | 1862 A. gaimardi (part.), Bate, Cat. Amphip. Brit. Mus., p.91 t.15 f.1 | 1898 A. diadema (part.), A. Della Valle in: F. Fl. Neapel, Head truncate nearly transversely. Pleon segment 3 with postero- lateral eorners quadrate, segment 4 deeply impressed, especially in J, with rather high carina projeeting angularly. Corneal lenses distinet, lower pair a little removed from lower corners of head, pigment well defined, red with chalky white eoating. Antenna 1 in Q very small, much shorter than pedunele of antenna 2, 24 joint longer than 1, flagellum about 7-jointed, a. little longer than peduncle; antenna 1 in d reaching beyond peduncle of antenna 2. Antenna 2 in O scarcely more than half length of body, in J as long as body, ultimate joint of peduncle equal to penultimate in ©, longer than it in d. Gnathopod 1, 6! joint a little shorter than 5%. Peraeopods 1 and 2, 7'% joint longer than 5% and 6'% combined. as 24 joint longer than rest of leg, expansion obliquely truncated, reaching beyond 3@ joint, which is longer than 4%, 6% scarcely longer than 4% and 5% combined, 7% about as long as 6%. Uropod 3 in Q only fringed with simple setules, in d with plumose setae on the confronted edges. Telson about twice as long as broad, apically blunted, carrying several pairs of dersal spinules, and in © 5 pain of marginal setules. Whitish, pellueid, mottled with light yellowish and a few reddish patches, intestine orange-coloured, ova in pouch rose-coloured. L. 10 mm. r North-Atlantie, North-Sea and Skagerrak (British Isles, South- and ee up to Trondhjemsfjord); Kattegat. Depth 37—112 m. ; 23. A. zamboangae Stebb. 1888 A. z.. T. Stebbing in: Rep. Voy. Ohaflinge e.29 p.1057 t.106 | 1893 4. diadema (part.), A. Della Valle in: F. Fl. Neapel, r.20 p.479_ Oo unkwown. — 9. Closely allied to A.typica (p. 109). Pleon segment 3 with postero-lateral corners almost quadrate, slightly rounded, segment 4 impressed and with a carina raised at the apex above the next segment. Corneal lenses 4, lower pair at the lower corners of the head. Antenna 1° reaching a little beyond peduncle of antenna 2, 24 joint not longer than 1*, flagellum about 24-jointed, much longer than peduncle, antenna 2 as long as body, ultimate joint of pedunele much longer than penultimate, flagellum 38-jointed, much longer than peduncle. Palp of mandible very large, 24 joint very broad, 3 much narrower but subequal in length. Gnathopod 1, 6% joint not much shorter than 5%. Peraeopods 1 and 2, 7% joint little longer than 52 and 6% combined. Peraeopod 5, 24 joint with expansion obliquely, but evenly rounded, reaching end of 34 jeint, wbich is much longer than the 4%, 6% not longer than the 4% and 5%: combined, 7% longer than the 6%, Tropod 3 with broad lanceolate rami serrate on tbe confronted margins and furnished with feathered setae and spines. Telson not twice as leng as broad, with one pair of dorsal spinules, cleft nearly */, length, the distal half triangularly tapering to the acute apices, each of which is notched for a setule. L. (in the position of usual curvature) 6 mm. Basilan Strait (Samboanga [Philippine Islands]). Surface. ’ 24. A.tenuicornis Lilj. 1855 A. £., W. Liljeborg in: Öfv. Ak. Förh, «12 p-123 | 1891 A.£., G.O.Sars, Crust. Norway, 2.1 p.167 £.58 £.1) 1862 A. laexigata (err., non W. Liljeborg 18551). Bate, Cat. Amphip. Brit. Mus., p. 96 | 1893 A. diadema (part.), A. Della Valle in: F. Fi. Neapel. e.20 p.479. Head strongly eurved anteriorly and obliquely truncate. Pleon segment 3 with postero-lateral corners quadrate, sharpened in ©, in JS more obtuse; segment 4 slightly impressed in >, with very low and scarcely projecting carına, in Ö deeply impressed, with distinet though rounded carina. Corneal lenses distinet, lower pair a litile removed from lower corners of head, pigment irregular, bright red. Antenna 1 in O not reaching end of peduncle of antenna 2, 24 joint about twice as long as 1, flagellum about 11-joöintel, nearly twice as long as peduncle; antenna 2 in Onearly as long as body, ultimate and penultimate jeints of peduncle subequal. Antennae in d as in A.typia (p-109). Peraeopods 1 and 2, 7% joint subequal to 5'# and 6% combined. Peraeopod 5, 24 joint scarcely longer than rest of leg, expansion nearly = transversely truneate, not reaching beyond 3@ joint, which is longer than 3 4%, 6% joint longer than 4 and 5% combined, 7% much shorter than 6. Uropod 3 in o with fewer marginal setules than in A. typica. Telson slighily ; constrieted near the base, without dorsal spinules, but with 3 pairs of anlage 11r setules. Whitish, pellueid, with a conspicuous carmine patch on side-plate 1. L. scarcely more tban 8 mm. B Nortli-Atlantie, North-Sea and Skagerrak (South- and West-Norway up to- Trondhjemsfjord, British Isles); Kattegat. Depth 19—188 m. 25. A. sarsi Chevreux 1888 A. s., Chevreux in: C.-R. Ass. Frang,, Sess. 16- E: v.2 P- 666. ee: Closely allied to A. tenuicornis. Head transversely truncate, similar to A.typica (p. 109). Pleon segment 3 with lateral margin slightly prolonged _ backward, rounded, segment 4 scarcely carinate in ©, in JS impressed and _ with a high gibbous carina. Eyes not mentioned, but perhaps to be presumed, - asthe head is compared to that of A.laerigata Liljeborg (p. 100). Antenna 1 in © - much shorter than peduncle of antenna 2. Antenna 2 in O ®/, length of body, in 9 longer than the body. Peraeopods 1 and 2, 7! joint as long as- 5th and 6th combined. Peraeopod 5, 24 joint not reaching end_of 34, 4% joint not overlapping 5%. L. 7 mm. North-Atlantie (Croisie).. Depth 15—20 m. A.agassizi (Judd) 1896 Byblis a., S.D.Juddin: P.U.S. Mus.. ‚e18p. 599 f. 9-11. Near to A. diadema (p. 107). 4 5 Narragansett Bay (Newport [Rhode I1sland]). ; ‘A. daleyi Giles 1890 A.d., G.M.Giles in: J. Asiat. Soc. Bengal, 2.59 p.66 1.2.3. = Side-plate 5 having hind border of hind lobe notched. Antenna 2, last 3 joints * of peduncle very long and slender, antepenultimate longest, ultimate shortest. Peraeo- pods 3 and 4 with 7th joint (finger or spine?) remarkably long and slender. L. 4 mm.. Bay of Bengal (Seven Pagodas near Madras). Depth 13 m. A.japonica Bate 1862 4.j5., (Stimpson in MS.) Bate, Cat. Amphip. Brit. Mus., p.A4t15 £5. L. 9 mm. North-Pacifie (Japan). 5. A. limicola (Stimps.) 1853 Pseudophthalmus l., P. limicolus, Stimpson in: - Smithson. Contr., 2.6 nr.5 p.57, 65 | 1862 Ampelisca limicola, Bate, Cat. Amphip. Brit. Mus., p.93 t.15 f.4. En: . But 1 clear eye-spot on each side of head. Peraeopod 5, 7th joint not lanceolate, - but stiliform and eurved. L. 15 mm. ; North-Atlantie (Charleston). Low water, in mud-holes. : A.nordmannii (M.-E.) 1840 Acanthonotus n.,. H. Milne Edwards, Hist. nat. Crust., v.3 p.24 | 1893 Ampelisca n., A. Della Valle in: F. Fl. Neapel, u. 20 p. 469. Black Sea (Crimea). "28 A. pelagiea (Stimps.) 1853 Pseudophthalmus pelagieus, Stimpson in: Smithson. — Contr., ©.6 nr.5 p.57 | 1862 Ampelisca pelagica, Bate, Cat. Amphip. Brit. ER p- 9. Be: L. 10 mm. Be ° Long Island Sound and Häke Bay [North-Ameriea]. Depth 55—91 m. Bi ö Be A. pugetica Stimps. 1864 A. pugeticus, Stimpson in: P. Ac. Philad., p. 158. 2 Puget Sound [western North-America]. Depth 18 m. # | 2. Gen. Byblis Boeck e- 1871 Byblis (Sp. un.: B. gaimardi), A. Boeck in: Forh. Selsk. Christian., 1870 BE P-228 | 1891 B., G. O. Sars, Crust. Norway, v.1 p. 182. Be. Head with postero-antennal corners distinet. Side-plate 1 searcely deeper than 2, not concealing base of antenna 2; side-plate 4 evenly curved _ 112 Byblis below the prominent posterior angle. Pleon segment 3, postero-lateral angles obtusely rounded. Corneal lenses 4 or none. Mandibular palp with 24 joint narrow, 39 narrow and rather short. Peraeopods 3 and 4, 24 joint rather broad, its front edge moderately eurved, 5t% joint carrying several transverse rows of spines. Peraeopod 5 (Fig. 27), 24 joint strongly produced, the long hind margin nearly straight, inner and lower margins of the squarely descending lobe "carrying a dense fringe of plumose setae; 34 joint shorter than 4", 4th and 5th rather wide, 6!" sublinear, 7t spiniform. Uropod 3 scarcely reaching beyond the others, rami narrowly lanceolate, not setose in ©, confronted edges more or less serrate. Telson short and broad, not very deeply eleft. Two pairs of hepato-pancreatie caeca. 10 species. Synopsis of species: j Cleft of telson minute — 2. \ Cleft of telson not minute — 5. Antenna 2, ultimate joint of pedunele longer than | penubamale'. ta re an Bersihtope 7 DR Antenna 2, ultimate joint of peduncle not longer than penultimate — 3. 3 j Corneal lenses wanting . » ... 2.0... 2. B.abysbl. - - ,:279.138 \ Corneal lenses not wanting — 4. penultimate; peraeopods 1 and 2, 6th joint much Antenna 2, ultimate joint of peduncle shorter than 4 IOnger Th DB 5 0 en ee 3. B. gaimardii . . p.113 penultimate; peraeopods 1 and 2, 6th joint not | Antenna 2, ultimate joint of peduncle equal to much lougör than. BE... 5 un 4. B. longieornis. . p. 113 Antenna 1 reaching well beyond peduncle of 5 antenna 2 — 6. R en l reaching scarcely or not beyond peduncle of antenna 2 — 8. 6 f Antenna 1 not very long...» 2.00... 5. B.affinis. . . . p.114 ntenna 1 very long — 7. A l y long r f. Gorneal lenses absent. . .. . 2.2... 2... 6. B. crassicornis . p. 114 Y. Oofneal ienses Present x”. 2.3... 0a 7. B. guernei . . . p.114 8 f Corneal lenses absent..... 2... . 2... 8. B.serrata . . . p.114 \ Corneal lenses present — 9. | Branchial vesicles and peraeopod 2 ofnormallength 9. B. kallarthra . . p.115 9 2 Branchial vesieles and peraeopod 2 of abuormal | langt Sy ee NEN REN 10. B.lepta; . .. ..- p. 115 1. B. erythrops O. Sars 1882 B.e., G. O. Sars in: Forh. Selsk. Christian., or.18 p.109 t.6 f£.8,3a 11891 B.e., G.O. Sars, Crust. Norway, v1 p.187 t.65 £.3| 1893 Ampelisca gaimardi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 472. Corneal lenses very small, lower pair removed from lower corners of front, pigment bright red. Antenna 1 little shorter than antenna 2, pedunele reaching considerably beyond end of penultimate joint of peduncle of antenna 2, flagellum in O 35-jointed, more than twice as long as peduncle; ultimate joint of peduncle ofantenna 2 notably longer than penultimate. Peraeopod 5, 24 joint produced below the 4fh, its front and lower edges in a continuous curve, 5tk joint as long as 3% and 4th combined, a little longer than the 6%, Uropod 3 with rami very slightly’ serrate on the confronted edges. Telson almost square, Es al ra a E ri; at Sn De na Re 113 distal angles rounded, cleft short. Body pellucid, with dark violet intestine shining through the integument, sides mottled with white. L. © 8 mm, or slightly more. Arctic Ocean and North-Atlantie (Magerö and Bejan [Norway]). Depth 150—188m, muddy bottom. ; 2. B.abyssi O.Sars 1879 B.a., G.O.Sars in: Arch. Naturv. Kristian., v.4 p-456 | 1885 B.a., G. O. Sars in: Norske Nordhavs-Exp., 0.6 Crust. 1 p.201 t.16 f.6 | 1891 B.a., G. O. Sars, Crust. Norway, v.1 p.189 t.66 f.2 | 1893 Ampelisca gaimardii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 472. Pe. Corneal lenses wanting. Antenna 1, peduncle not nearly reaching end of penultimate joint of peduncle of antenna 2, flagellum in Q 28-jointed, twice as long as peduncle; ultimate joint of pedunele of antenna 2 notably shorter than penultimate, antenna 2 nearly twice as long as antenna 1. Peraeopod 5, 24 joint broad, reaching a little below 4%, front and lower edges in a continuous curve, but almost quadrate, 5!" joint as long as 34 and 4th combined, slightly longer than 6, 7tk joint very short. Uropod 3, inner margin of inner ramus serrate, that of outer ramus almost smooth. Telson almost quadrate, - but broader than long, slightly narrowed distally, distal angles rounded, cleft - nearly obsolete. Colour whitish, pellueid. L. © 12 mm. Br. Arctie Ocean and North-Atlantie (West- and Northwest-Norway). “ Depth 659 —1186 m. ; 3. B. gaimardii (Kroyer) 1846 Ampelisia (laps., corr.: Ampelisca) g., Kroyer in: Voy. Nord., Crust. t.23 f. 1a—y | 1871 Byblis gaimardi, A. Boeck in: Forh. Selsk. Christian., 1870 p.228 | 1891 B. gaimarditi, G. O. Sars, Crust. Norway, v.1 p.183 t.64| 1893 Ampelisca g. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 472 t.57 f.39—41 | 1896 Byblis serrata (err.?, non S. I. Smith 1873!), S.D. Judd in: P. U. S. Mus,, v. 18 p- 596 f. 4—8. Corneal lenses large, lower pair occupying lower corners of front, - _ pigment brownish. Antenna 1, peduncle not reaching end of penultimate joint of - _ peduncle of antenna 2, flagellum in O 20-jointed, twice as long as peduncle, ultimate joint of peduncle of antenna 2 shorter than penultimate. Peraeopods 1 and 2 having 6! and 7% joints each much longer than tbe 5"; peraeopod 5 with 24 joint produced below the 4, its front and lower edges defined by an obtuse - angle, 5tk joint as long as 34 and 4! combined and rather longer than the 6th, Uropod 3 having the rami acute, with confronted edges serrate and a projecting corner near the base. Telson with nearly equal length and breadth, eleft very short. Colour whitish- with faint orange markings, front of head mottled with dark violet. L.9 15, J rather less (Sars), reaching 23 mm (Ohlin). Arctie Ocean, North-Atlantie and North-Sea (whole West-Norway); Christiania- fjord; Kattegat. Depth 37—150 m. 4. B.longicornis O.Sars 1891 B.L., G.O.Sars, Crust. Norway, v.1 p.185 1.65 £.1 | 1893 Ampelisca gaimardii (part.), A. Della Valle in: F, Fl, Neapel, v.20 p. 922 | 1894 Byblis intermedius, T. Stebbing in: Bijdr. Dierk., v.17 p.18. Corneal lenses smaller than in B. gaimardii, lower pair removed from lower corners of front, pigment light brown. Antenna 1, peduncle usually reaching end of penultimate joint of peduncle of antenna 2, flagellum in 9 27—35-jointed, twice aslong aspeduncle; ultimate and penultimate joints of peduncle of antenna 2 - „subequal; both pairs longer than in B. gaimardii. Peraeopods 1 and 2 having 6 E joint not much longer than 5'%; peraeopod 5 with 24 joint not produced below the 4, its front and lower edges in a continuous curve, 5!" joint scarcely as long as 34 and 4 combined and shorter than the 6%. Uropod 3 with rami acute and confronted edges serrate, but without projecting corner near Das Tierreich. 21. Lief.: T.R.R. Stebhing, Amphipoda I. 8 a ee a ie > . \ FRONT SE N 5% 114 Byblis the base. Telson broader than long, slightly tapering, eleft very short. Head not mottled. L. © 12 mm. Aretie Ocean (Lofoten Isles, Finmark, South-Spitzbergen, Barents Sea). 5. B. affinis VO. Sars 1891 B.a., G.O. Sars, Crust. Norway, v.1 p.186 t.65 f.2 | 1893 Ampelisca gaimardii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.907, 922. Corneal lenses smaller than in B. longieornis (p. 113), lower pair remote from lower corners of front, pigment dark brownish. Antenna 1, peduncle reaching end of penultimate joint of peduncle of antenna 2, flagellum in 9 24-jointed, twice aslong aspeduncle; ultimate and penultimate joints of peduncle of antenna 2 subequal; both pairs shorter than in B: longicornis. Gmathopod 1 with 6th joint little shorter than 5%, a character which this species has in common only with B. serrata and B. guernei. Peraeopods 1 and 2 having 6th joint eonsiderably longer than 5t"; peraeopod 5 with 24 joint not produced below the 4h, front and lower edges in a continuous curve, but almost quadrate, . 5th joint as long as 34 and 4% combined, and rather longer than the 6", Uropod 3 lanceolate, with confronted edges slightly serrate. Telson very little broader than long, very slightly tapering to the truncate distal margin, cleft extending almost to the middle. Body pellucid with reddish intestine, head dotted with whitish and brownish pigment not ramified, orange patches on 22 joint in peraeopods 3—5 and on pleon. L. © 9 mm. Trondhjemsfjord. Depth 75—113 m. 6. B. crassicornis Metzg. 1875 B.c., Aug. Metzger in: Jahresber. Comm. D. Meere, v.2/3 p.297 t.6 f.9, 9a,b | 1891 B. c., G. O. Sars, Crust. Norway, v.1 p. 188 t.66 f.1 | 1893 Ampelisca gaimardü (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.472. Corneal lenses wanting. Antenna 1, peduncle reaching eonsiderably beyond penultimate joint of peduncle of antenna 2, flagellum in O9 20-jointed, scarcely twice as long as peduncle; ultimate joint of peduncle of antenna 2 a little shorter than penultimate, antenna 2 little longer than antenna 1. Peraeopod 5 with 24 joint less expanded than usual, scarcely reaching beyond the 4" joint, front and lower margins in a continuous curve, 5t% joint little longer than 4", not longer than 6% Uropod 3, rami not serrate on the confronted edges. Telson fully as long as broad, much tapering, cleft nearly reaching the middle. Body pellueid, nearly colourless. L. 9 7 mm. Bukkenfjord (Jaederen, Hvitingsö), Christianiafjord. Depth 188—282 m. 7. B. guernei Ühevreux 1887 B. g., Chevreux in: Bull. Soc. zool. France, v.12 p. 576. Corneal lenses very distinet. Antenna 1 more than °/, length of the body; antenna 2 as long as the body, ultimate joint of peduncle a little shorter than penultimate. Gnathopod 1, 5tt joint a little longer than 6", Peraeopod 5 having the 24 joint much expanded and reaching to the end of the 5t" joint. Telson a little broader than long, distally truncate, cleft extending to the middle. L.5 mm. North-Atlantie (Cape Finisterre). Depth 510 m. 8. B. serrata S. I. Sm. 1873 B. s., (S.I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p.561 | 1879 Ampelisca minuticornis, G.O.Sars in: Arch. Naturv. Kristian., v.4 p.455 | 1885 A. m., G.O. Sars in: Norske Nordhavs-Exp., 0.6 Crust. I p-198 t.16 f.5a—o | 1893 A. m., A. Della Valle in: F. Fl. Neapel, ©.20 p.477 | 1891 Byblis m., 6. O. Sars, Crust. Norway, v.1 p. 190 t. 66 £.3. Byblis 115 Lower margin of side-plate 1 (Sars), or side-plate 1 and 2 (Smith) serrate between marginal setae. Corneal lenses wanting (Sars, not mentioned by Smith). Antenna 1 scarcely reaching beyond penultimate joint of peduncle of antenna 2, flagellum in © 6-jointed, shorter than peduncle; antenna 2 little more than half as long as the body, ultimate joint of pedunele shorter than penultimate. Gnathopod 1 with 5% joint scarcely if at all longer than 6*" (Smith and Sars 1885, but considerably longer in Sars’s figure). Peraeopod 5, 24 joint much expanded and reaching to the end of the 5% joint, anterior corner rounded off (Sars), anterior and inferior margins evenly arcuated (Smith), 5!" joint about as long as 34 and 4 combined and about as long as the 6. Uropod 3 with eonfronted edges not having any distinet serration. Telson subquadrate, about as long as broad, eonverging (rapidly, Smith) to distal margin, eleft extending about.to the middle (Sars), rather more than half its length (Smith and Sars 1885). Body highly pellucid, and nearly colourless (Sars), specked and mottled on ‚side-plates; 24 joint of peraeopods 3—5, and sides of pleon with erowded points of dark pigment (Smith). L. © 8—12 mm. Aretie Ocean and North-Atlantie (Spitzbergen, West- and North-Norway, depth 659-—1193 m; off Vineyard Sound and Buzzard Bay, deep water). 9. B. kallarthra Stebb. 1886 B. kallarthrus, T. Stebbing in: P. zool. Soe. London, p.4 | 1887 B.k., T. Stebbing in: Tr. zool. Soc. London, v.12vı p.199 t.38 | 1893 Ampelisca k., A. Della Valle in: F. Fl. Neapel, v.20 p. 476. Lower margins of side-plates 1 and 2 serrate, side-plate 4 produced back- wards with sinuate lower margin, not observed in any other species. The 4 corneal lenses surrounded with dark pigment. Antenna 1 scarcely more than reaching end of pen- ultimate joint of peduncle of antenna 2, flagellum in o 11-jointed, a little longer than peduncle; ultimate joint of peduncle of antenna 2 rather shorter than penultimate, antenna 2 not quite °/, length of body. Gnathopod 1, 5% joint much longer than 6%", Peraeo- pods 1 and 2, 6% joint considerably longer than 5t%; peraeopod 5 (Fig. 27) with 24 joint produced fully to the end of the 5tk, the front and lower margins forming a gently continuous curve, 5% joint considerably longer than 34 and 4! combined and much longer than 6%, Uropod 3 with confronted margins of rami serrate and angled near the base. Telson slightiy longer than broad, a little rounded, cleft extending Fig. 27. a little beyond the middle. Branchial vesicles with B. kallarthra. secondary lamellae on both sides. L. © 10 mm. Bey serke Singapore Strait. 10. B. lepta (Giles) 1888 Ampelisca l., G. M. Giles in: J. Asiat. Soc. Bengal, v.57 p.223 t.8,9 | 1893 A. 1, A. Della Valle in: F. Fl. Neapel, v.20 p. 89. The 4 corneal lenses surrounded with dark brown pigment. Antenna 1 reaching a little beyond peduncle of antenna 2, flagellum with 10 very slender joints; antenna 2, °”/, length of body, ultimate joint of peduncle a little shorter than penultimate, flagellum 14- or 15-jointed. Peraeopod 2 unusually elongate. Peraeopod 5, 24 joint descending below the 4%, Uropod 3, rami apparently serrate on confronted margins and angled near the base. Telson deeply cleft, semilunar. Colour ivory white. Branchial vesicles of great length, with - conspicuous accessory laminae on each surface. L. about 6 mm. Head of Bay of Bengal. Depth 195 m. 7th joint 8* 116 Haploops 3. Gen. Haploops Lilj. 1855 Haploops, W. Liljeborg in: Öfv. Ak. Förh., v.12 p.135 | 1891 H., 6.0. Sars, Crust. Norway, v.1 p.191 | 1893 H., A. Della Valle in: F. Fl. Neapel, v.20 p.111, 126, 485 | 1894 H., T. Stebbing in: Bijdr. Dierk., ©.17 p.18. Head with postero-antennal corners rounded off. Side-plate 1 deeper than next pair, partly concealing base of antenna 2; 4 evenly curved below the prominent posterior angle. Eyes less perfect than in the other genera, corneal lenses 4 or 2 or none. Mandibular palp (Fig. 28) setose, with elongate 39 joint. Peraeopods 3 and 4, 24 joint rather broad, its front edge moderately curved, dt carrying several transverse rows of spines. Peraeopod 5 (Fig. 29), 24 joint squarely dilated above, so that the front and hind margin are subparallel, while the descending lobe is narrowly or broadly rounded, its margin fringed with setae, of which there are many also on the hind margin and surface of the expansion; 34 joint shorter than Ah, 4th and Stk hroad, 6% very narrow, 7% spiniform. Uropod 3 reaching conside- rably beyond the others, rami foliaceous, setose at the edges, inner margin of inner ramus armed with strong spines. Telson of moderate size, usually deeply cleft. One pair of hepato-pancreatie caeca (Della Valle). 5 species. Synopsis of species: | Body smooth or nearly so, eorneal lenses present — 2. 1 2 Body with dorsal fascieles of setae, corneal lenses _ | absent — 4. Antenna 1 very long; uropod 1, inner ramus very BHO A le We en 1. H.dellavallei . p.116 ] Antenna 1 not very long; uropod 1, inner ramus not very short — 3. 2 Corneal lenses 2; uropod 3 in 2, rami subequal, 3 | NET N ee ae ia er er abloole > RB Corneal lenses 4; uropod 3 in 2, rami unequal, BOB ne N 8. Fu 1soVis . 2... B. 4117 4 f Telson cleft a little beyond the middle ... . . 4; H.inetosa : . ; ». PT \ Telson cleft nearly to the base . . . ........ 5. H. robusta . . . p.118 1. H. dellavallei Stebb.*) 1893 H.tubicola (err., non W. Liljeborg 1855!), A. Della Valle in: F. Fl. Neapel, v.20 p. 486 t.3 £.2; t.87 £. 1-18. Corneal lenses 4, colour of eyes erimson, standing out on a ground of bright yellow. Antenna 1 much longer than the body, flagellum 7 times as long as peduncle, of about 30 joints with very long setae. Antenna 2 subequal to antenna 1, ultimate joint of peduncle a little longer than penultimate, flagellum as in antenna 1. Peraeopod 5, 24 joint rather narrow, broadest at base, hind margin concave, lower lobe narrow, scarcely reaching beyond the short 34, 4th and 5t" equal, 5tk with both margins crenate, 6 and Th very small. Uropod 1 perfeetly smooth, inner ramus spine-like, "/, length of outer; uropod 2 furnished with spines; uropod 3 with the rami subequal and foliaceous, armed with spinules and setules. Telson heart-shaped, cleft almost to the base, with a setule on each side of the almost acute apex. Colour pearl-grey, changing into yellow-brown on the sides; a large erimson blotch occupies part of the head and peraeon segment 1. L. 8 mm. Gulf of Naples. Depth 20-40 m. *) Spec.nov. After Antonio Della Valle. a len See vis ter ea" Sn. LEER VON a Haploops 117 2. H.tubicola Lilj. 1852 Ampelisca eschrichti? (err., non A. eschrichtii Kroyer 18421), W. Liljeborg i in: Öfv. Ak. Förh., v.9 p.6 | 1855 Haploops tubicola + H. carinata, W. Liljeborg in: Öfv. Ak. Förh., v.12 p.135, 136 | 1880 H.t., Stuxberg in: Bih. Svenska Ak., 0.5 nr.22 p.65 | 1891 H.t., G.0. Sars, Orust. Norway, v.1 p.192 t.67 | 1894 H.t., 7; Stebbing in: Bijdr. Dierk., v.17 p.19. Pleon in carinate. Corneal lenses 2, ent bright reddish. Antenna 1 about half length of body, 24 joint much longer than 1°, flagellum 2'/, times as long as pedunele, with about 23 joints carrying setae. Antenna 2 - subequal to antenna 1, ultimate and penultimate joints of peduncle subequal. Peraeopod 5, 24 joint rather narrow, broadest at base, hind margin concave, lower lobe narrow, scarcely reaching beyond 34 joint, 4 longer than 5tk, 6 and 7b very small. Uropod 1, inner ramus °/, length of outer, carrying spinules; uropod 3, rami subequal and foliaceous, fringed in J with long ciliated setae, in Q with shorter setae, the outer ramus having also 4 spinules. Telson a little longer than broad, cleft extending far beyond the middle, apices somewhat rounded. Body whitish, pellueid, with dark violet intestine. L. 0 11, 90 10—22 mm. Arctic Ocean, North-Atlantie, North-Sea, Skagerrak, Kattegat and Baltie (Nor- wegian, Danish, Dutch, French and British coasts). 3. H.laevis Hock ?1866 H. tubicola (part.), Go&s in: Öfv. Ak. Förh., v.22 p.528 | 1895 H. t. {par ), A. Della Valle in: F. Fl. Neapel, v.20 p.486 | 1882 H. laevis, Hock in: Niederl. Arch. Zool., suppl. 1 nr.7 p.61 t.3 f£.31 | 1894 H.l!., T. Stebbing in: Bidr. Dierk., v.17 p.19 t.3. Several segments of peraeon with a patch of fine down on tbe back. Corneal lenses 4. Antenna 1 about half length of body, 1° joint nearly as long as 24, flagellum in Q 30- jointed, scarcely twice as long as peduncle; antenna 2 rather longer than antenna 1, ulti- mate joint of peduncle a little longer than penultimate. Gnathopod 1, 6! joint distally rather widened instead of narrowed as is more usual. Peraeopod 5 (Fig. 29) nearly as in H. tubicola, but the little 6" and 7% joints more elongate. Uropod 1, inner ramus ?/, length of outer, both SS‘ smooth; uropod 2 furnished N with spines; uropod 3 in © with rami not longer or broader than those ofuropod 2, Fig.28. H.laevis. setose, the inner and shorter rege branch earrying also 2 spines. Telson scarcely longer than broad, cleft fully */, length, sides slightly converging, apices broadly rounded. L. reaching 19 mm. Arctie Ocean (between lat. 690 and 76°N., long. 36° and 65° E.). Depth 45—276 m. 4. H.setosa Boeck 1871 H.s., A. Boeck in: Forh. Selsk. Christian., 1870 p.228 | 1876 H.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.541 t.80 £.7 | 1891 H.s., G. O. Sars, Crust. Norway, v.1 p.194 t.68 f.1 | 1893 H.s., A. Della Valle in: F. Fl. Neapel, v.20 p.489. Fig. 29. H.laevis. Peraeopod 5. 118 Haploops, Haustoriidae Fascicles of long slender setae rising from dorsal end of peraeon segments 5—7 and pleon segments 1—3. Head with lower corners distinetly angular. Postero-lateral angles of 34 pleon segment very slightly produced. Patches of reddish pigment in the position of the absent corneal lenses. Antenna 1 more than half as long as body, 24 joint of pedunele much longer than 1°, flagellum 24-jointed, twice as long as peduncle; antenna 2 subequal to antenna 1, ultimate and penultimate joints of peduncle subequal. Gnathopod 1, 6" joint distally narrow. Peraeopod 5, 24 joint broad, hind margin straight, lower lobe broad, descending much below the 34, the expansion on surface and margin being densely setose, 4!" and 5th joints subequal, 5tl not equalling in length the narrow 6!" and 7" joints combined. Uropod 1 slightly armed, inner ramus °/, length of outer; uropod 2 with rami much shorter than those of uropod 3, which are foliaceous and setose, the inner and shorter carryıng 2 spines. Telson about as long as broad, cleft scarcely - beyond the middle, tapering to an almost acute apex. Colour greyish white, with brownish intestine. L. © 13 mm. Aretie Ocean; North-Atlantie, North-Sea and Skagerrak (South- and West-Norway). 5. H. robusta O. Sars 1891 H.r., G. O. Sars, Crust. Norway, v.1 p.195 t. 68 f.2|1893 H.r., H.setosa?, A. Della Valle in: F. Fl.:Neapel, v.20 p.907, 982 | 1894 H.r., T. Stebbing in: Bijdr. Dierk., 0.17 p. 18. Perhaps not distinet from H.setosa. Fascicles of setae as in H. setosa. Head with lower angles more or less rounded. Postero-lateral angles of 3% pleon segment not produced. Cormeal lenses wanting. Antenna 1 in the type speeimen less than half length of body, with 24 joint of peduncle little longer than 1°, but sometimes little differing from the proportions‘ in H. setosa; flagellum sometimes consisting of 33 joints; antenna 2, flagellum sometimes of 30 joints. Peraeopod 5 as in H. setosa, but 4 and 5tk joints rather longer in proportion to breadth. Uropod 3 with 3 spines on the inner ramus. Telson rather longer than broad, cleft almost to the base. L. reaching 22:5 mm. . Arctic Ocean (Finmark, and between lat. 720 and 76° N., long. 16° and 54° E.). 4. Fam. Haustoriidae 1882 Pontoporeiidae, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.22 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.804 | 1891 P., G. ©. Sars, Crust. Norway, v.1p.121. Head ‚seldom rostrate. Side-plates of moderate size, generally fringed with setae, side-plate 5 bilobed. Antenna 1 (Fig. 30, 32) usually shorter than antenna 2 (Fig. 31, 33), with accessory flagellum, joints of peduncle sharply defined. Epistome not projeeting. Upper lip with rounded margin, lower lip quadrilobate. Mandible with dentate eutting edge, accessory plate, prominent and large molar, palp 3-jointed. .Maxillae 1 and 2 (Fig. 34) and maxillipeds usually but not always normal. Gnathopods 1 and 2 seldom powerful, weakly subchelate or chelate.. Peraeopods 3—5 (Fig. 35, 36) varied, often adapted for burrowing. Branchial vesicles simple. Pleopods as a rule well developed, especially ind. Uropods 1—3 biramous, uropod 3 unlike uropods 1 and 2. Telson flattened, more or less deeply cleft. Marine; also in brackish and fresh water. 8 genera, 21 accepted, 5 doubtful species. inner plate with many setae, 29 joint of palp with A Bi pi . . n L u ; 3 Haustoriidae, Bathyporeia 119 . Synopsis of the genera: = Antenna 1 (Fig. 30) geniculate between Ist a er 1. Gen. Bathyporeia . . p.119 Antenna 1 (Fig. 31, 32). not geniculate — 2. - Peraeopods 4 (Fig. 35) and 5 with 4th and 5th joints greatly expanded — 3. Peraeopods 4 and 5 (Fig. 36) with some or all of those joints little expanded — 4. f Gnathopods 1 and 2 with 3d joint elongate 2. Gen. Platyischnopus . p. 122 \ Gnathopods 1 and 2 with 34 joint short . Gen. Haustorius . . . p.124 f One of the side-plates abnormally small . . 4. Gen. Cardenio . . . . p.125 \ None of the side-plates abnormally small — 5. Ps Side-plates 1—4 obtusely pointed below . . 5. Gen. Priseillina . . . p.126 ? | Side-plates 1—4 broadly rounded below — 6. j Gnathopod 1, 5th joint short and broad . . 6. Gen. Pontoporeia. . . p.127 \ Gnathopod 1, th joint long and narrow — 7. | Peraeopod 4, 4th joint not expanded; peraeo- 7 @w pod 5, 2d joint not greatly produced downward a N RER 7. Gen. Urothoe. ... . p. 128 | Peraeopod 4, 4th joint RR expanded; peraeo- pod 5, 2d joint greatly produced downward 8. Gen. Urothoides . . . p.132 1. Gen. Bathyporeia Lindstr. 1855 Bathyporeia (Sp. un.: B. pilosa). Lindström in: Öfv. Ak. Förh.; «.12 p.59| 1857 Bathyporea (laps.), Bate in: Ann. nat. Hist., ser.2 v.19 p.271 | 1891 Bathyporeia, G.O. Sars, Crust. Norway, v.1 p.127 | 1893 B., A. Della Valle in: F. Fl. Neapel, v. 20 p. 751 | 1856 Thersites. (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.59 | 1857 T. (non L. Pfeiffer 1855, Mollusca!), Bate in: Ann. nat. Hist.. ser.2 v.19 p. 146. Body eompressed. Head without rostrum. Side-plates not very large, 1° narrow, bent forward. Pleon segment 4 with 2 dorsal setules curving forward. Antenna 1 (Fig. 30) shorter than antenna 2, geniculate between the 1° and 2 joint, 1° abouttwiceaslong as 24 and 3% combined, accessory flagellum small, 2-jointed, flagellum with calceoli on upper margin in d. Antenna 2, ultimate joint of pedunele shorter than penultimate, flagellum „same short in ©, long, with caleeoli, in . Mandible, 1 joint "7 eutting plate narrowly produced, simple, few spines in spine-row, 39 joint of palp narrow, curved. Maxilla 1, Accessory agellum apex incurved, hairy. Maxillipeds, outer plates rather short, with strong spines on inner margin, 24 joint \ of palp large, hairy, strongly produced at inner apex, Fig. 80, 34 narrow, incurved, 4!" small. Gnathopod 1, 6% joint B. guilliamsoniana. oval, shorter than 5th, scarcely subchelate, finger smalk Arne. N, Gnathopod 2, fringed with long setae, the 6th joint slenderly subfusiform, finger wanting. Peraeopods 1 and 2 short, with 4th joint rather stout.. Peraeo- _ pod 3 doubly genieulate in posture, 24 joint narrowest at the base, 4 expanded, setose, 5th and 6 narrow, 7*Yh wanting. Peraeopod 4, 24 and 4th -joints more expanded than in peraeopod 5, both pairs with finger rudi- mentary, and having terminal joints fringed with setae and groups of spines. Uropod 3, outer ramus long, 2-jointed, inner small, laminar. Telson cleft to base, carrying spines on truncate apices and outer lateral margins. 5 species accepted, 1 doubtful. ea aa N re 120 Bathyporeia Synopsis of accepted species: Pleon segment 3, postero-lateral angles produced | 0.2 Wolh: nee TR A en 1. B. guilliamsoniana . p.120 : | Pleon segment 3, postero-lateral angles not produced to a tooth — 2. j Pleon segment 4 with dorsal spinules — 3. . | Pleon segment 4 without dorsal spinules — 4. J Pleon segment 4 with 1 pair of dorsal spinules 2. B. pelagiea ... . . p- 120 \ Pleon segment 4 with 2 pairs of dorsal spinules 3. B.gracilis ..... p- 121 Peraeopods 4 and 5, 2d joint less than half 4 as long ‚as rest ot im. . 5.08 55 4. B. robertsoni .. . . . p.121 Peraeopods 4 and 5, 2d joint more than half ds. long 98 rent Of Imb . ... ..2.000.5 D: 3. DHOBA 20% p- 121 1. B. guilliamsoniana (Bate) 1856 Thersites guilliamsonia (nom. nud.),. Bate in: Rep. Brit. Ass., Meet. 25 p.59 | 1857 T. guilliamsoniana, Bate in: Ann. nat. Hist., ser.2 v.19 p. 146 | 1857 Bathyporea guilliamsonia, B. pilosa?, Bate in: Ann. nat. Hist., ser.2 v. 19 p. 271 | 1862 Bathyporeia p. (err.. non Lindström 1855!), Bate, Cat. Amphip. Brit. Mus., p.172 t.31 f.4 | 1891 B. norvegica, G. ©. Sars, Crust. Norway, v1 p.128 t.43 | 1898 B.n., A. Della Valle in: F. Fl. Neapel, v.20 p.754 | 1893 B.n., T. Seott in: Rep. Fish. Board Seotl., v. 11 p. 213 t.5 £. 22. Back comparatively broad. Head scarcely as long as peraeon segments 1 and 2 combined. Side-plate 1 acutely pointed, 24 and 39 with small tooth at hinder angle. Pleon segment 3 with postero-lateral angles forming a short but distinet tooth; segment 4 dorsally depressed deeply at base, with a pair of spinules behind the bent setules. Eyes in Q reniform, in S much longer, widening upward, dark red. Antenna 1 (Fig. 30), flagellum in o with 8, ind with 13 joints, 24 joint of accessory flagellum !/, as long as the 1%, which has spinules on both edges. Antenna 2, tlagellum in O with 8 joints, shorter than last 2 of peduncle, in J slender, considerably longer than the body. Gnathopod 1, 6 joint broadly oval, much shorter than 5tk., Peraeopod 3, 4% joint much expanded, setose, as long as 5!" and 6!" combined. Peraeopods 4 and 5, 24 joint about half as long as rest of limb. Uropod 3, 1° joint of outer ramus a little dilated distally, 24 about !/, as long, setose. on both margins. Each half of telson sublinear, with about 9 apical spines and 4 lateral. Body pellueid, nearly colourless.. L:Q 7, 0 8 mm. North-Atlantice and North-Sea (England, between tide-marks; Scotland; South- Norway, depth 4—11 m). i 2. B. pelagica (Bate) 1856 Thersites p. (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.59 | 1857 T. p., Bate in: Ann. nat. Hist., ser.2 v.19 p.146 | 1862 Bathyporeia p., Bate, Cat. Amphip. Brit. Mus., p. 174 t.31 f.6 | 1891 B. p., G. O. Sars, Crust. Norway, v.1 p.129 t.44 f.1 | 1895 B.p., T. Scott in: Rep. Fish. Board Scotl., v. 11 p. 213 t.5 f.23—25 | 1875 B. pilosa (part.), T. Stebbing in: Ann. nat. Hist., ser. 4 v.15 p.74 t.3 | 1898 B.p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 752 | 1877 B. tenuipes, Meinert in: Naturh. Tidsskr., ser. 3 v. 11 p. 201. More slender than the preceding species; head fully as long as peraeon segments 1 and 2. Side-plate 1 less narrowed in front, obtusely pointed, in 24 and 34 tooth obsolete. Pleon segment 3, lateral angles rounded, without tooth; segment 4 with a like pair of spinules. Eyes in Q small, rounded oval, larger ind, bright red. Antenna 1, flagellum in 9 6-, in C 9-jointed; accessory flagellum, 24 joint nearly half as long as 1°, which has spinules on outer edge only. Antenna 2, flagellum in © with 7 joints, much shorter than last 2 of ‘ DE I SE lesen Ann in nn alte SE Ze nn Re S E 3 =: R- B 3 Bathyporeia 121 'pedunele, in S about as long as the body. Gmathopod 1, 6! joint oblong oval, somewhat shorter than 5%. Peraeopods less setose. Uropod 3, 1° joint of outer ramus scarcely dilated distally, 2% nearly half as long, and in O without lateral setae. Telson with about 6 apical spines and 2 lateral on each half. Body pellueid, nearly colourless. L. scarcely more than 5 mm. Aretie Ocean, North-Atlantie, North-Sea, Skagerrak and Kattegat (Scandinavia, France, Great Britain). 3. B. gracilis 0. Sars 1891 B.g., G.O. Sars, Crust. Norway, v.1 p.132 t.45 . £.1] 1893 B. pilosa (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 752. Rather slender though not much compressed; head about as long as peraeon segments 1 and 2. Side-plate 1 rather narrow, obtusely pointed, 24 and (?) 3% with tooth. Pleon segment 3, angles rounded, without tooth; segment 4 not deeply depressed and carrying 2 pairs of spinules. Eyes imperfectly developed, and not at all visible in spirit specimens. Antenna 1, flagellum in © with 6, in J with 8 joints; accessory flagellum, 24 joint scarcely more than !/, length of 1°, which has spinules only on outer edge. Antenna 2 in 9 twice as long as. antenna 1, flagellum slender, subequal to last 2 joints of peduncle, 8-jointed ; in C scarcely longer than in 9 , flagellum with 13 joints, distinet ealceoli on the first 5. Gnathopod 1, 6*% joint regularly oval, much shorter than 5, Peraeopods 3—5 much more slender than in any of the other species known, 4h joint little expanded in peraeopod 3 and scarcely as long as 5 and 6 combined; 5tk and 6!k very elongate and narrow in peraeopods 4 and 5. Uropod, 3, 24 joint of outer ramus about "/, length of 1°, both margins smooth. Each half of telson rather narrow, with 4 apical spines and 2 lateral. IL. about 6 mm. North-Atlantie (West-Norway). From rather deep water. 4. B.robertsoni Bate 1862 B.r., Bate, Cat. Amphip. Brit. Mus., p.173 t.31f.5 | 1891 B. robertsoni, G. O. Sars, Örust. Norway, v.1 p.131 t.44 f.2 | 1893 B. robertsoni, T. Seott in: Rep. Fish. Board Seotl., v. 11 p.213 t.5 f.26—29 | 1875 B. pilosa (part.), T. Stebbing in: Ann. nat. Hist., ser.4 v.15 p.74 | 1893 B.p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 752. In general agreement with B. pelagiea. Pleon segment 4 without dorsal spinules. Eyes rather large, oblong oval or reniform, very dark. Antenna 1 in C, flagellum 9-jointed; accessory flagellum, 24 joint extremely small, - 1° with group of spinules in middle of inner margin. Antenna 2 in adult S scarcely more than half length of body, flagellum about twice as long as pedunele, with 17 joints, the first 15 each with rather large calceolus. Gnatho- pod 1, 6 joint ovate, about as long as 5t", finger hook-like. Uropod 3, . 24 joint of outer ramus scarcely more than '/, length of 1%, which is rather expanded. L. 6 mm. Arctic Ocean, North-Atlantie and North-Sea (Finmark, Great Britain, France). 5. B. pilosa Lindstr. 1855 B. p.,“Lindström in: Öfv. Ak. Förh., 0.12 p.59 t.2 f.1—11 | 1891 B.p., G. O. Sars, Crust. Norway, v.1 p.133 t.45 f.2 | 1893 B.p. (part.), A. Della Valle in: F,F]. Neapel, v.20 p. 752. In general agreement with B.pelagica. Pleon segment 4 slightly impressed and with no dorsal spines behind the forward eurving setules. Eyes in O small, rounded oval, in © somewhat larger, blackish. Antenna 1, 1°t joint scarcely twice as long as 24 and 34 combined, flagellum in © 6-, in C 12-jointed; he a RT ro I bi Ei - ER ud howel,; “r bee? BZ N, er Er er, n be N: 2 ae 122 Bathyporeia, Platyischnopus accessory flagellum, 1 joint much coarser than in B. pelagica, 24 little more than !/, aslong. Antenna 2 in Q little longer than antenna 1, flagellum shorter than ultimate and penultimate joints of pedunele combined, 8-jointed, in nearly as long as the body. Gnathopod 1, 6%% joint oval, about as long as 5t", Peraeopod 3, 4th joint considerably expanded, densely fringed, much longer than the short 5th and 6% combined. Peraeopods 4 and 5 much shorter and coarser in structure than. in the other 4 species. Uropod 3, 1% joint of outer ramus rather expanded, 29 scarcely more than '/, as long. Lobes of telson comparatively short, each with 6 apical and 3 lateral spines.. L. about 5 mm. Baltic, Kattegat. Depth 4--75 m. B.lindströmi Stebb.*) 1893 B. pilosa (part.) (err., non Lindström 1855)), A. Della Valle in: F, Fl. Neapel, ©.20 p. 752 t.5 f.1; t.36 f. 19-32. General aspeet robust. Side-plate 1 ending obtusely, 24 with tooth at hinder angle (front in text). Pleon segment 3, angles rounded, segment 4 carrying a single forward bending setule and a pair of spinules.. Eyes oval, scarlet. Antenna 1 in 2, ‚flagellum 5- or 6-jointed. Antenna 2 in 2, flagellum 10-jointed, nearly equal ultimate and penultimate joints of peduncle combined. Gnathopod 1, 6th joint broadly oval, much shorter than 5th. Peraeopods 2, 3 and 4 as in B. pelagica (p. 120), peraeopod 5 elongate as in B. graeilis (p. 121), but the finger said to be wanting. Uropod 3, outer ramus, 24 joint about ?/; length of 1st. Apices of telson said to be rounded. No apical spines mentioned or figured. Body pellueid, colourless, or with a yellowish tinge. L. 5 mm. Bay of Naples. Depth 10—20 m, in sand. 2. Gen. Platyischnopus Stebb. 1888 Platyischnopus (Sp. un.: P. mirabilis), T. Stebbing in: Rep. Voy. Challenger, v.29 p.830 | 1893 Platyschnopus, A. Della Valle in: F. Fl. Neapel, ©.20 p. 784. Head (Fig.31) long, rostrate. re Side-platesI—3 small, 4!" quadrate. Antenna 2attached in front of eyes to lower surface of head, 24 joint 52 of pedunele longer than 1% or N / 34, flagellum in O few-jointed, Ay ( ( L not longer than peduncle, accessory flagellum half as long, 3-jointed. N Antenna 2 (Fig. 31) very little longer than antenna 1, attached behind the eyes, ultimate joint of peduncele shorter than penultimate, IN ee Accessory longer than the3-jointed flagellum. flagellum Upper lip evenly rounded. Lower lip without inner lobes. Mandible, N N eutting edge narrowly produced, DT} ! N er En accessory plate perhaps wanting, no spine-row, molar prominent, denticulate, palp rn with 39 joint shorter than 24, both ed a naeh long and slender. Maxilla 1, inner plate small, outer with 8 or 9 nearly simple spines, palp 1-jointed with 3 setae. Maxilla 2, outer plate the broader. Maxillipeds, inner plates not large, outer narrow, with strong *) Spec. nov. After Gustaf Lindström. Platyischnopus 123 spine-teeth on inner margin, reaching beyond long 2% joint of palp. Gmatho- pods 1 and 2 long and slender, distinetly chelate, or gnathopod 1 nearly simple, 24 and 5th joints elongate. Peraeopods 1 and 2 small, 4 joint longer than 5th or 6th, Peraeopod 3, 24, 4th and 5tk joints more or less widened. Peraeo- pod 4, 24 joint oval, 4 and 5 much expanded. Peraeopod 5, 24 joint much broader than long, 4!" and 5tk well expanded. Uropod 1, outer ramus a little, uropod 2 (and probably urepod 3), outer ramus much longer than inner. Telson rather longer than broad, widely emarginate at apex or - deeply eleft. The hood-like shape of head and the 1-jointed palp of maxilla 1 approximate this anomalous genus to the Phoxocephalidae (p. 133), the long, slender, chelate gnathopods 1 and 2 and the emarginate telson to some Acanthonotozomatidae (p. 210). 2 species. Synopsis of species: Gnathopods 1 and 2, 3d joint elongate ... . . ... 1 P-mirabilis ... . p.123 Gnathopods 1 and 2, 3d joint very short. . ... - . 2. P. neozelanicus . p. 123 =. 1. P. mirabilis Stebb. 1888 P.m., T. Stebbing in: Rep. Voy. Challenger. v.29 5 p. 830 t.58 | 1893 Platyschnopus m., A. Della Valle in: F. Fi. Neapel, v. 20 p.785 t. 60 £. 86. Head longer than peraeon segments 1—3 combined, shallower where the small, round, dark eyes are placed than before or behind them (Fig. 31). Rostrum pointed. Pleon segment 3, postero-lateral angles produced into a small, acutely upturned point. In antenna 1 and 2 all the flagella slender, 1° joint longest. Gnathopod 1, 3% joint elongate, 6* joint the widest of all, rather shorter than the 5*b, its front margin much shorter than the hinder, being thus produced into an acute triangle for antagonism with the small nail-tipped finger. Gnathopod 2, all the joints except the finger longer than in gnathopod 1, 6" joint rather more than half as long as 5t, the chela-forming process shorter and sharper than in gnathopod 1. Peraeo- pods 1 and 2, 4% joint rather long and broad, finger slender, tapering. Peraeo- pods 3—5, 4 and 5t" joints with many groups of spines; in peraeopod 3 24 joint widened below, in peraeopod 4 regularly and rather broadly oval,« in peraeopod 5 partially fused with the side-plate, twice as broad as long, with aeute hinder angle. Peraeopod 5, 4 and 5tk joints greatly expanded. Uropod 3, peduncle rather stout, much longer than one of the rami, the other ramus unknown. L. about 8 mm. Port Jackson [East-Australia], depth 4—19 m; tropical Atlantie (harbour of Bahia). en RE EINE Or 2. P. neozelanieus Chilton 1897 P.n., Chilton in: Ann. nat. Hist., ser. 6 v.1%&p.1.t5. . Body rather broad, chiefly at peraeon. Head and position of antennae as in P. mirabilis. Antenna 1 rather shorter than antenna 2, peduncle longer than flagellum, 2 joint a little longer than 1°t, oblong, with 4 or 5 long plumose setae, flagellum 5-jointed, accessory flagellum 3-jointed. Antenna 2, peduncle stout, flagellum apparently about as long as ultimate joint of peduncle. Mouth-parts not preeisely known. Gmnathopod 1, 24 joint ending in 2 long setae, 31 short, 5th Jonger and wider than 6t", setose on sinuous hind margin, 6% slightly widened distally, with long setae on distal half of hind margin, no distinet palm, finger rather small. Gnathopod 2 similar in general shape but rather longer, 5! joint twice as long as 6!", and widened near the base, 6!" produced 124 Platyischnopus, Haustorius distally to a small tooth, forming a little chela with the minute finger. Peraeopod 1, 6 joint rather longer than 5%, apex oblique with about 6 spiniform setae, a little longer and more slender than the finger. Peraeo- pod 2 rather longer than peraeopod 1, 5tk joint with convex hind margin, carrying about 6 plumose setae, which reach beyond the finger. Peraeopod 3, 24 joint as broad as long, remainder not very different from P. mirabilis. Peraeopod 4 similar to peraeopod 3. Peraeopod 5, 2° joint broader than long, 4!" and 5tk moderately expanded. Uropod 3, peduncle much shorter than rami, outer slightly longer, 2-jointed, each with 2 or 3 long plumose setae. Telson double or deeply «left, each lobe with 2 lateral setules and a stout apical spine. L. about 4 mm. Otago Harbour [New Zealand]. 3. Gen. Haustorius St. Müll. 1775 Haustorius (Sp. un.: H. arenarius), St. Müller in: Slabber, Phys. Belustig., p-48 | 1888 H., T. Stebbing in: Rep. Voy. Challenger, v.29 p.39 | 1891 H., G. O. Sars, Crust. Norway, v.1 p.134 | 1893 H., A. Della Valle in: F. Fl. Neapel, 0.20 p.750 | 1818 Lepidactylis (Sp. un.: L. dytiscus), Say in: J. Ac. Philad., v.1ıı p.379 | 1825 Pterygocerus (Sp. un.: Oniscus arenarius), Latreille in: Enc. möth., v.10 p.236 | 1829 Pterygocera, Latreille in: G. Cuvier, Rögne an., n. ed. v.4 p.124 | 1851 Bellia (Sp. un.: B. arenaria) (non H. Milne Edwards 1848, Decapoda!), Bate in: Ann. nat. Hist., ser.2 v.7 p.318 | 1854 Sulcator, Bate in: Ann. nat. Hist., ser.2 v.13 p. 504. Back broad, except in pleon segments 4—6, which are usually folded in. Head with small rostrum. Side-plates 1—3 obtusely pointed, 4 little Accessory _ flagellum Fig.32. Antenna1l. Fig. 33. Antenna 2. Fig. 34. Maxilla 2. Fig. 32—34. H.arenarius. [After G. O. Sars.] { excavate. Antennae 1 and 2 (Fig. 32, 33), joints of peduncle very distinct, with fan-like armature of plumose setae chiefly on penultimate, flagellum shorter than peduncle; accessory flagellum of antenna 1 well developed; penultimate joint of peduncle of antenna 2 longer and greatly wider than ultimate. Mandible normal, palp large, 34 joint not shorter than 24. Maxilla 1, inner narrowed, palp with 2 sets of setae on 2 joint. Below the base is a setose lamina, of which been explained. Maxilla 2 (Fig. 34), inner Fig. 35. H. arenarius. plate with a sinuous setose ridge on the ie see surface, outer much larger, semilunar, densely setose on inner and ciliated on outer margin. Maxillipeds, inner and outer plates subequal, narrow, fringed on inner margin, 24 joint of palp large, ARFRINT ENT * BD plate small, with several setae, outer apically- 6° joint the homology and function have not hitherto {er a Be nz PER EEE Fe FR NET: 2 wi N, Ne IT % we IE nl Pi ee Sn Sn, Ka a Ki Haustorius, Cardenio much produced, 34 sharply bent, 4" wanting. Gnathopod 1 simple, 5tk joint much broader and longer than 6'%, finger small. Gnathopod 2, forming a minute chela. Peraeopods 1 and 2, 4% and 5th joints rather broad, 5tk and 6! short, 5t% widened distally. Peraeopods 3—5 (Fig. 35) with 24, 4th and 5tk joints much expanded and carrying many spines and setae. Finger wanting in all peraeopods. Pleopods weak. Uropod 1 strong, spinose; uropod 2 smaller, setose; uropod 3, outer ramus 2-jointed, longer than inner, setose at tip. Telson short, much broader than long, not tapering, a little incised. 1 species. 1. H. arenarius (Slabber) 1769 Oniscus a., O. arenatius, Slabber, Natuurk. Verlustig., p. 92 t.11 £.3,4 | 1775 Hausiorius arenarius, St. Müller in: Slabber, Phys. Belustig., p.48 | 1891 H.a., G.O. Sars, Crust. Norway, v.1 p.135 t.46 | 1893 H. a., A. Della Valle in: F. Fl. Neapel, 0.20 p.750 t.60 f.22,23 | 1825 Oniscus a., Pterygocerus, Latreille in: Enc. meth., v.10 p.236 | 1829 O.a., Pterygocera, Latreille in: G. Cuvier, Rögne an., n. ed.v.4 p.124 | 1878 P.arenaria, Bovallius in: Bih. Svenska Ak., v.4 nr. 8 p-1 t.1—4 | 1851 Bellia a., Bate in: Ann. nat. Hist., ser.2 v».7 p.318 t.11 f. 1-8 | 1854 Sulcator arenarius, Bate in: Ann. nat. Hist., ser.2 v.13 p.504 | 1871 S. arenatius, A. Boeck in: Forh. Selsk. Christian., 1870 p.137 | 1818 Lepidactylis dytiseus, Say in: J. Ac. Philad., v. 11 p. 380. Pleon segment 3 much larger than 1° or 24, angles rounded, setose. Eyes small, imperfectly developed, light-coloured. Antenna 1 (Fig. 32), flagellum 9-jointed, accessory flagellum 5-jointed. Antenna 2 (Fig. 33) little longer than antenna 1, flagellum 10-jointed. Gnathopod 2 more slender than gnatho- pod 1, 6! joint much shorter than 5tk, In peraeopod 4 (Fig. 35), 4" joint much larger than in the other pairs, longer than broad. In peraeopod 5 4% joint much broader than long. Telson twice as broad as long, cleft not reaching the middle, each lobe with .an apical tuft of spinules and 2 lateral spinules. Colour paler than sand. L. © 11 mm. Burrows with great dexterity in wet sand. Will live long in suitable eonfinement. North-Atlantie (Holland, France and Britain, North-America); Kattegat. 4. Gen. Cardenio Stebb. _ 1888 Cardenio (Sp. un.: C. paurodactylus), T. Stebbing in: Rep. Voy. Challenger, .29 p.806 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p.749 | 1890 Cardenis, Warburton in: Zool. Ree., 0.25 Crust. p. 18. Head somewhat produced. Side-plate 1 very small, 4 broader than deep, scarcely excavate. Antenna 1 shorter than antenna 2, accessory flagellum small, with 2 joints, 22 minute. Mandible short, strong, cutting edge quadri-dentate, accessory plate rather stronger on left than on right mandible, left with 3, right with 2 spines in spine-row, molar strong, palp broad, 3% joint much shorter than 24, Maxilla 1, 12 setae on inner plate, 9 spines on outer, several spinules and setules on 24 joint of palp. Maxilla 2, both plates broad, inner with lateral as well as apical armature. Maxillipeds, inner plates moderate, outer fringed with spinules, nearly reaching apex of ‚palp’s long 24 joint; 1° of palp very short, 4" rudimentary or wanting. Gnathopods resembling those of Synopia. Gmnathopod 1, 5!" joint broad and long, 6! narrower, only half as long, both fringed with spines and setae, finger rudimentary. Gnathopod 2, 24, 5tk and 6th joints long and slender, 6° more than half as long as 5'%, capable of celosing against it; both carrying long setae, finger wanting. Peraeopods 1—5, 4!" joint widened, 126 Cardenio, Priseillina little in 24, greatly in 3% pair; longer than 5tk in all but the 1% pair; 5th joint rather wide; finger wanting in 1°, 24 and 5% pairs; short and blunt, tipped with long spine in 34 and 4" pairs. Uropod 1, peduncle longer than sub- equal rami; uropod 2, peduncle intermediate in length between rami; uropod 3, peduncle much shorter than lanceolate rami. Telson long, tapering, celeft nearly to base. 1 species. 1. C. paurodactylus Stebb. 1888 C.p., T. Stebbing in: Rep. Voy. Challenger, v.29 p.806 t.53 | 1893 C©.p., A. Della Valle in: F. Fl. Neapel, v.20 p.750 | 1890 Cardenis ?.. Warburton in: Zool. Rec., v.25 Crust. p. 18. Back rounded, head as long as peraeon segments 1 and 2 combined. Hind margin of pleon segments dorsally dentieulate. Pleon segment 3, postero-lateral angles acute, segments 4—6 comparatively long. Eyes reniform, small but with numerous components, set near front of head, dark in spirit. Antenna 1, joints of pedunele nearly equal, not long, flagellum in O 4-jointed. Antenna 2, ultimate joint of peduncle rather longer than penultimate, flagellum in © 5—7-jointed. Gnathopod 2, 6% joint with an apical projecting point. Peraeopod 3, 24 joint almost eireular, but wider than deep. Peraeopod 4, 24 joint with sinuous hind margin, little wider than the 4!" and not so long. Peraeopod 5, 2° joint more expanded, 4" shorter, 6 Jonger than in preceding pair. L. 5 mm. Southern Indian Ocean (Kerguelen Islands). 5. Gen. Priscillina Stebb. 1871 Priscilla (Sp. un.: P. armata) (non Jam. Thomson 1864, Coleoptera!), A. Boeck in: Forh. Selsk. Christian., 1870 p.124 | 1891 P., G. ©. Sars, Crust. Norway, e.1 p.125 | 1888 Priseillina, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1680 | 1893 P., A. Della Valle in: F. Fl. Neapel, v.20 p. 754. Side-plates 1—4 strong, ending below in an obtuse, setose point, side- plate 5 small. Antenna 1 shorter than antenna 2, accessory flagellum rather large; peduncle setose in both pairs. Mandible normal, palp robust. Maxilla 1, inner plate large with many setae; maxilla 2, plates subequal. Maxillipeds, outer plates scarcely reaching end of 24 joint of palp. Gnathopods 1 and 2 subchelate, 6! joint as broad as 5tk, finger rather short. Peraeopods 1—5 with many fascieles of spines, finger minute. Peraeopods 3 and 4, 24 joint little expanded, upper hind angle (at least in Q) produced to a hook-like process. Peraeopod 5, 24 joint greatly expanded, densely setose. Uropods 1—3 rather robust. Uropod 3, outer ramus spinose, with minute 24 joint, inner very small. Telson laminar, deeply notched. 1 speeies. 1. P. armata (Boeck) 1861 Pontoporeia a., A. Boeck in: Forh. Skand. Naturf., Mode 8 .p.648 | 1871 Priseilla a., A. Boeck in: Forh. Selsk. Christian., 1870 p.124 | 1891 P.a., G.O.Sars, Crust. Norway, v.1 p.126 t.42 | 1888 Priseillina a., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1719 | 1893 P.a., A. Della Valle in: F. Fl. Neapel, v.20 p. 754 t. 60 f.24, 25. ‚Head with sharply produced postero-antennal angles. Body rather robust, back broad. Pleon segments 2 and 3 dorsally ending in upturned acute process, postero-lateral eorners rounded. Eyes inconspieuous (in spirit). Antenna 1, flagellum much shorter than peduncle, 10-jointed, accessory r N Bu TEN FEIPER N a fs NE Se NT a a a AR Ne Te a je. 4 8 = 3 e “ h A ee. NEE a" EUR Er Den. GEISTER EN INERE, SUR IT Be De FH m Ma ST a Fa Priseillina, Pontoporeia 127 flagellum more than half length of primary, 5-jointed. Antenna 2, ultimate joint of peduncle much smaller than large penultimate, flagellum in 9 about half length of peduncle. Gmnathopod 1, 6! joint as long-as 5t%, rather broader, palm oblique. Gnathopod 2, palm transverse. Peraeopod 3, hook of 2% joint larger than in peraeopod 4. Peraeopod 5, 24 joint nearly orbicular, 5th oradually expanded distally, with series of short spines. Telson little longer than broad, notched widely a fourth of length, each truncate apex with 4 spinules. L. 11 mm. Aretie Ocean and North-Atlantie (Greenland; West-Norway?). 6. Gen. Pontoporeia Kroyer 1842 Pontoporeia (Sp. un.: P. femorata), Kroyer in: Naturh. Tidsskr., «.4 p.152 | 1891 P., G.O. Sars, Crust. Norway, v.1 p.122 | 1893 P., A. Della Valle in: F. Fi. Neapel, v.20 p.716 | 1846 Pontoporia, L. Agassiz, Nomencl. zool., Index p.305 | 1853 Pontiporeia, J. D. Dana in: U. S. expl. Exp., v.13ur p. 912. Side-plate 5, front lobe the larger. Antennae 1 and 2 in 9 subequal, with short flagella, in C flagella long. Mandible normal, palp slender, setose. Maxilla 1, inner plate with a few setae. Maxilla 2, outer plate the broader. Maxillipeds, outer plates not quite reaching end of broad 24 joint of palp, palp’s 4" joint small. Gnathopod 1 setose, 5!" joint laminarly expanded, 6! smaller than 5%, palm ill-defined, finger feeble. Gnathopod 2 slender, subchelate or almost chelate, 6" joint narrow, finger small. Peraeopod 4 the longest. Peraeopods 1 Pp. Bihocate and 2, 4tk joint rather long. Peraeopods 3 and 4, 24 joint _ Peraeopod 5. slightiy expanded, narrowed below. Peraeopod 5 (Fig. 36). 0 Sams] 24 joint greatly expanded, setose. Peraeopods 1—5, finger small. Uropod 3 short, rami 1-jointed, outer the larger. Telson squamiform, deeply celeft. 3 species accepted, 1 doubtfully distinet. Synopsis of accepted species: Gnathopod 1, palm short ......... 1. P. mierophthalma . . p. 127 Gnathopod 1, palm not short — 2. Pleon segment 4 with furcate dorsal process. 2. P. femorata. .. . . p. 128 2 Pleon segment 4 without dorsal process or DOIBRL DE a ia 0. PB p- 128 1. P. microphthalma 0. Sars 1896 P. m., (0. Grimm in MS.) G. O. Sars in: Bull. Ac. St.-Pötersb., ser.5 v.4 p.428 t.2 f. 1—7. Back not broad. Pleon segment 4 dorsally raised at apex with 2 denticles (spines?) at top and a spinule on each side. Head,” lateral corners narrowly ' rounded. Side-plates and pleon segment 3 as in P. affinis (p. 128). Eyes small, irregularly oval, pigment light. Antenna 1, flagellum subequal to peduncle, 9-jointed, accessory flagellum 3-jointed. Antenna 2, last 3 joints of peduncle thick, hirsute, flagellum 9-jointed. Gnathopod 1 with much shorter palm than in the other 2 species. Gnathopod 2, palm transverse, not as in the other 2 species produced to a thumb-like prominence. Peraeopod 5, 24 joint longer than rest of limb, more regularly rounded oval than in the 'other 2 species, with which the uropods and telson agree. L. (0?) 6 mm. Caspian Sea. Depth 144---162 m. 128 Pontoporeia, Urothoe 2. P. femorata Kroyer 1842 P.f, Kroyer in: Naturh. Tidsskr., «4 p.153 | 1846 P. f., Kroyer in: Voy. Nord, Crust. t.23 f.2a—y | 1891 P. f., G. O. Sars, Crust. Norway, o.1 p.123 t.41 f.1| 1893 P. f., A. Della Valle in: F. Fl. Neapel, ©.20 p. 717 t.60 £.7 11859 P. furcigera, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr. 1 p.49 t.2 f.8 | 1884 P. f., H. Blanc in: N. Acta Ac. Leop., v.47 p.60 t.7 £.40-—44. Back broad. Head, lateral corners angular. Side-plates 1—3 with tooth at lower hind corner, 1° broadly expanded, 5tt with front lobe deep. Pleon segment 3, postero-lateral angles narrowly rounded; segment 4 with bifurcate process on the back. Eyes reniform, bright red. Antenna 1 in O, flagellum shorter than peduncle, 9-jointed, accessory flagellum 2-jointed. Äntenna 2 in O, ultimate and penultimate joints of peduncle subequal, together equal to 12-jointed flagellum. Gnathopod 1, 5! joint very broad, 6!" obliquely and broadly oval, finger very slender and curved. Gmathopod 2, 6% joint a little shorter than 5tt. Peraeopod 5 (Fig. 36), 24 joint very broad, much longer than rest of limb. Uropod 3, outer ramus considerably larger than inner, densely spinose on outer edge. Telson rather longer than broad, cleft beyond centre, 3 setules on each rounded apex. Colour paleyellowish. L. 9 14—17 mm. Arctie Ocean; North-Atlantie (Labrador, Norway); Kattegat; Baltic. Depth 38—188 m. 3. P. affinis Lindstr. 1855 P. a., Lindström in: Öfv. Ak. Förh., v.12 p.68 | 1867 P.a., G. O. Sars, Crust. d’Eau douce Norvege, p.82 t.7 £.10-—25; 1.8 f.1—5 | 1891 P..a., G. O. Sars, Crust. Norway, v.l p.124 t.41 f.2 | 1893 P..a. (part.), A. Della Valle in: F. Fl. Neapel, ©.20 p.717 t.54 f.1 | 1885 P. femorata (err., non Kroyer 1842!), H. Blane in: N. Acta Ac. Leop., v.47 p.58 t.6 f.33; t.7 f. 34—39. Back less broad than in P. femorata. Pleon dorsally hirsute, segment 4 without process. Head, lateral corners narrowly rounded. Side-plates 1— 3 without tooth, 1° little expanded, 5! with front lobe not very deep. Pleon segment 3, corners subquadrate. Eyes small, oval, black. Antenna 1 in 9, flagellum as long as peduncle, accessory flagellum 3-jointed. Antenna 1 in f) (P. filieornis Smith), flagellum 35-jointed; antenna 2 in d‘, flagellum 50-jointed. Gnathopod 1, öth joint of moderate breadth, 6!" narrow oval. Gmathopod 2, 6th joint about as long as 5Ü, Peraeopod 5, 24 joint scarcely longer than rest of limb. Uropod 3 in Q very small. Telson small, broader than long, cleft about to centre (Sars) or nearly to base (Blanc). Colour yellowish, orange- tinged, bluish-green borders. L. 9 8 mm. Fresh water lakes (Norway, Sweden, Russia, North-America); Baltic, Kattegat, Kara Sea, North-Atlantie (France). P.hoyi S.I. Sm: 1871 P.affinis (err.?, non Lindström 1855), S. 1. Smith (& A.E. Verrill) in: Amer. J. Sci., ser.3 v.2 p.452 | 1893 P.a. (part.), A. Della Valle in: F, Fl. Neapel, v.20 p.717 | 1874 P. hoyi + Pontiporeia filicornis, S. I. Smith in: Rep. U. S. Fish. Comm., %.2 p.647 t.2 f.5; p. 649. Neither the „papilliform appendages“ (mentioned also by Sars 1867 in P. affinis) on the sternal portion of the thoracie segments in P. hoyi, nor ehe long flagella with calceoli in P. filicornis 3 are of specific value. North-America (Lake Superior, Lake Michigan). [3 . Gen. Urothoe Dana 1852 Urothoe, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.311 | 1853 D. (part.), 7. D. Dana in: U. S. expl. Exp., v. 1311 p.920 | 1857 Ur othoß, Bate in: Ann. nat. Hist., ser.2 v.19 p.145|1891 Urothoe, T.Stebbing in: Tr. zool. Soe. London, v.131 p.1|1891 Urothog, G.0. Sars, Crust. Norway, v.1 p.137 | 1893 Urothoe, A. Della Valle in: F. Fl. Neapel, v.20 p. 663 | 1855 Egidia (Sp. un.: E. pulchella), A. Ödsta in: Rend. Soe. Borbon., n. ser. v.2 p. 170. N: Sb hab Babel) En ac u sus isn Alu, 237 Sub nahen En: us, 4 dr ee 1 en sh a a En 3 Y s o rn a N la Has nie 2E nu 1a60 BÜTTE CN 1 DZ Se EEE BR TE ee 3 I b - = 32 Br. EN & F Zul # 4 & 2 5 P: t e: E 7 Urothoe 129 Body robust. Head slightly produced, sides triangular downward below the antennae. Side-plates not large. Gland-cells numerous. Antenna 1, joints of peduncle not very unequal, flagellum and accessory flagellum very short. Antenna 2, peduncle spinose, ultimate joint in S with calceoli, flagellum in © 2- or 3-jointed, in d long, many-jointed, with calceoli. Upper lip rounded. Mandible, eutting edge scarcely denticulate, accessory plate small, spine-row wanting, molar strong, palp slender, 1° joint not short, 39 as long as or longer than 24. Maxilla 1, inner plate slight, number of setae small, variable, outer plate with 11 spines, 24 joint of palp equal to or longer or shorter than 1°, with 3 apieal setae. Maxilla 2, inner plate with armature on inner margin, outer rather the broader. Maxillipeds, plates of moderate size, outer fringed with spines, 24 joint of palp produced, 39 club-shaped, 4th slender. Gnathopods 1 and 2 similar, weakly subchelate, 6!" joint shorter than 5t"; finger longer in gnathopod 1 than in gnathopod 2. Peraeopods 1 and 2, 4th joint longer than either 5tt or 6, both of which are strongly spined. Peraeopod 3, joints 2—5 dilated, 24 quadrate, joints 4—6 strongly spinose, joint 5 as wide as or wider than 4"; peraeopod 4 the longest; peraeopods 4 and 5, 24 joint oval, others not expanded. All the legs have a cap over finger-tip. Peraeopods 1—5, finger nodulous or serrulate. Pleopods, inner ramus the shorter. Uropods 1 and 2, rami narrow. Uropod 3, rami foliaceous, not very unequal, setose especially in S. Telson cleft nearly to base. As a rule peraeopods 1 and 2 have a row of setae on outer surface of joints 4 and 5; there are long plumose setae in peraeopod 3 on inner distal margin of joints 4 and 5 and on inner surface of joint 6, in peraeopod 4 on inner surface of 24 joint and hind margin of 4b, in pleon segment 2 on lower inner surface. 7 species accepted, 3 obscure. Synopsis of the accepted species: 1 a RI er AEE a 1. U. abbreviata . p.129 \ With eyes — 2. 9. J Uropod 1, rami strongly eurved. .... 2... 2. U. marina . . . p.130 \ Uropod 1, rami not strongly eurved — 8. 3 Peraeopod 3, 5th joint extremely broad — 4. '\ Peraeopod 3, 5th joint not extremely broad — 5. 4 j Uropod 3, inner ramus longer than outer . ... . 3. U.grimaldii . . p.130 \ Uropod 3, inner ramus shorter than outer . . . . 4. U. pulchella . . p. 130 f Uropods 1 and 2 strongly armed ........ 5. U. poucheti . . p.13l \ Uropods I and 2 weakly armed — 6. 6 j Antenna 1, accessory flagellum long. .... ». 6. U. brevicornis . p.131 \ Antenna 1, accessory flagellum short ..... . . 7. U. elegans . . . p.13l 1. U. abbreviata O.Sars 1879 U.a, G.O.Sars in: Arch. Naturv. Kristian., v.4 p.446 | 1885 UT. a., G. O. Sars in: Norske Nordhavs-Exp,, v.6 Crust. I p.164 t. 14 f.1| 1891 D.a., T. Stebbing in: Tr. zool. Soe. London, v».131 p.3, 9 | 1895 UT. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 664. Body remarkably short and thick-set. Pleon segment 3, postero-lateral eorners quadrate. Eyes wanting. Antenna 1 much longer than antenna 2, 3 joints of peduncle uniform in length, flagellum 4-jointed, accessory flagellum 1-jointed. Peraeopod 3, 24 joint short and broad, the others greatly (moderately in figure) dilated at the extremity, finger almost straight. Uropod 3 very small. Telson small. Colour yellowish white. L. 4 mm. Perhaps the young of U. elegans (p. 131). Arctic Ocean (Finmark). Depth 1167 m. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 9 130 Urothoe 2. U. marina (Bate) 1857 Sulcator marinus, Bate in: Ann. nat. Hist., ser. 2 e.19 p.140 | 1862 Urotho& m., Bate, Cat. Amphip. Brit. Mus., p.115 t.19 f.2 | 1869 U. m.? var. pectinatus, E. Grube in: Abh. Schles. Ges., 1868/69 p.119 | 1891 TU. m., T. Stebbing in: Tr. zool. Soe. London, v. 131 p.16 t.2 | 1893 TD. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 664. Eyes very large in adult ©, nearly meeting on top of head. Antenna 1, 34 joint ?/, length of 24, flagellum 9-jointed, accessory flagellum 5-jointed. Antenna 2, flagellum in O as long as ultimate joint of peduncle, flagellum in C 50-jointed. Maxilla 1, inner plate with 4 or 5 setae, joints of palp equal. Gnathopod 1, 5t" joint having at the distal margin a row of 12 pectinate spines and a row of microscopie spinules; gnathopod 2 without these rows, palm less oblique, finger shorter than in gnathopod 1. Peraeopods 1 and 2, finger with 5 tubereles on hind margin. Peraeopod 3, 24 joint very broad, hind corners ‘obtuse, 39 broader than long, 4" rather longer, scarcely wider, inner apical margin fringed with 16 very long plumose setae, 5tk nearly as long as 34 and 4th combined and slightly wider, 6th Jonger, much narrower than 5#, 7th nearly as long as 6**, rather broad, except at tip, with about 13 nodules on front margin. Uropod 1, peduncle equal to outer ramus, rami smooth, strongly eurved, inner much less than outer; uropod 2 smaller, rami smooth, slightly eurved, outer scarcely longer than inner; uropod 3, rami subequal, rather long, moderately broad, in G densely plumose, outer with minute 24 joint. Telson, length and breadth equal, cleft nearly to base, each apex with feathered cilium, spine and 3 setae. L. 8 mm. North- Atlantie (Shetland Islands, Moray Firth, Firth of Clyde, Liverpool Bay, France). 3. U. grimaldii Chevreux 1895 U. g., Chevreux in: Mem. Soc. zool. France, v.8 p.498 f. 1-4. | Q unknown. — d. Eyes very large, oval, meeting on top ofhead. Antennal, 24 joint of peduncle rather longer than 1°, 1° than 34, flagellum shorter than 34, 4-jointed. Antenna 2, flagellum 40-jointed. Mouth-organs more robust than usual. Maxilla 1, inner plate small, with 3 setae, outer plate very. broad, 1° joint of palp longer than 24, Gnathopods 1 and 2 rather slender. Peraeopod 3, 24 joint with hinder angles rounded, 3% and 4tk subequal, ‚St 2'/, times as broad as long, with very numerous spines, finger having 5 or 6 long spines on front margin. Uropods 1 and 2 with slender subequal rami, inner branch in 1° slightly armed. _Uropod 3 uniquely having the inner ramus rather longer than the outer; 24 joint of outer minute. Telson cleft nearly to the base, a little broader than long, with 2 spinules on each apex. I. 35 mm. Mediterranean (Morocco). Depth 2 m. 4. U. pulchella (A. Costa) 1853 Egidia p., A. Costa in: Rend. Soc. Borbon., n. ser.v.2 p.172 | 1876 Urotho@p., A. Boeck, Skand. Arkt. Amphip., v.2 p. 225 | 1891 - D.p., T. Stebbing in: Tr. zool. Soe. London, v.181 p.11 t.4A | 1893 D. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 664 t.5 f.3,8; t.36 f.1—18; t. 60 £.11, 12. Eyes in S reniform, except in smaller stages, in © eircular. Antenna 1, 1°t and 24 joints equal, 34 rather shorter, flagellum 5- or 6-jointed, little longer than ultimate joint of peduncle, accessory flagellum 3- or 4-jointed, longer than half primary. Antenna 2, flagellum in © scarcely as long as ultimate joint of peduncle, flagellum in S 34-jointed. Maxilla 1, inner plate slender, with 6 setae, 1°t joint of palp rather broader and longer than 24. Gnathopod 1, 7 spines Urothoe 131 in the row on distal margin of 5tk joint. Gnathopod 2, 6% joint about *), length of 5%, with the small convex palm more prominent than usual. Peraeopod 3, ‚geh joint scarcely longer or broader than 34, 5tk more than 1!/, times as broad as long, with many spines, finger narrowing abruptly to a sharp apex, its front margin not nodulous, but finely serrulate. Uropod 1, rami curved, armed with 2 spines; uropod 2 smaller, rami smooth; uropod 3, rami plumose but not densely, outer exceeding length of inner by its small 24 joint. Telson short, a little broader than long, sides convex, each apex armed with a spinule. Colour of © grey, tinted on the back with violet, of C erimson. L. 5 mm. Gulf of Naples, North-Atlantie (West-France). 5. U. poucheti Chevreux 1888 U.p., Chevreux in: Bull. Soc. zool. France, v.13 p.34 | 1891 U. p., T. Stebbing in: Tr. zool. Soe. London, v.131 p.9, 25 | 1893 U. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 664. oO unknown. — Q'. Body comparatively slender. Eyes very large and dark, meeting on the top of the head. Peraeopod 3, 24 joint with hinder angles well rounded, 4!" not broader than 34, not strongly spined, 5th not broader than 4b, finger long, slender, distal half serrate. Uropod 1, rami equal, slender, not quite as long as pedunele, which is more spinose than in other species, outer ramus with 4 spines; uropod 2, rami equal, slender, shorter than peduncle, outer with 3 spines; uropod 3, rami long. L. 5 mm. North-Atlantie (Azores). 6. U. brevicornis Bate 1862 U.b., Bate, Cat. Amphip. Brit. Mus., p.116 t.20 £.1 | 1891 U. b., T. Stebbing in: Tr. zool. Soe. London, v.131 p.23 t.3, dc | 1893 . U. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 664. Eyes in J conspicuous, almost contiguous at the top. Antenna 1 in J, 1° joint longer than 24, flagellum 7-jointed, accessory flagellum 6-jointed, more than half length of primary. Antenna 2, flagellum in © shorter than ultimate joint of pedunele, flagellum in G 23-or 24-jointed. Maxilla 1, inner plate with 3 setae, 1° joint of palp rather longer than 24. Gnathopod.1 as in U. marina (p. 130), spines on distal margin of 5*" joint varying in number. Peraeopod 3, 24 joint with angles more acute than usual, other joints as in U. marina, except finger, which tapers gradually and has finer nodules. Uropod 1, pedunecle longer than in U. marina, equal to the rami, which are slender, subequal, nearly straight, reaching beyond the 24 pair, outer with 3 spinules, inner with 1—3 setules; ‚uropod 2, peduncle shorter than rami, which are subequal, straight, with 2 or 3 spinules on outer and a spinule on the inner. Uropod 3 and telson as in U. marina. L. about 8 mm. St. George’s Channel, Bristol Channel and English Channel (Wales and Devonshire). 7. U. elegans Bate 1857 U.e., Bate in: Ann. nat. Hist., ser.2 ».19 p.145 | 1861 U. norvegica, A. Boeck in: Forh. Skand. Naturf., Mede8 p.647 | 1891 U. n., G.O. Sars, Crust. Norway, v. 1 p.138 t.47 | 1891 DU. elegans + U. n., T. Stebbing in: Tr. zool. Soe. London, v.131 p. 13 t.4; p.21 t.4B | 1893 U. irrostrata (vark: 2 A. Della Valle in: ‚F. Fl. Neapel, v.20 p. 664. Eyes moderately large in adult d. Antenna 1, 34 joint °/, length of 24, flagellum 6-jointed, accessory flagellum 3-jointed. Antenna 2, flagellum ‚ing equal ultimate joint of pedunele, 2- or 3-jointed, flagellum in C 40-jointed. Maxilla 1, inner plate with 2 setae, joints of palp equal. Peraeopods 1 and 2, finger with 3 or 4 distant pointed tubereles. Peraeopod 3, 2 joint rather variable 9*+ 132 Urothoe, Urothoides in width, 4%" joint longer and wider than 34, 5tk Jonger than broad, not broader than 4, finger rather narrow, distal half slenderly tapering, with 7 small tubereles on front margin. Uropod 1, rami smooth or almost smooth, nearly straight, subequal; uropod 2 much smaller, otherwise similar; uropod 3, rami rather broad, plumose, outer rather the longer. Telson longer than broad, cleft nearly to the base, with spinule and setule on each apex. Colour in life, adorned with rose-coloured markings (Bate), yellowish, changing in the © to light orange (Sars). L. 4—6 mm. | North-Atlantie (England, Scotland, West-France, Azores, Norway). U. bairdii Bate 1862 U. b., Bate, Cat. Amphip. Brit. Mus., p. 114 t.19 £.1| 1871 U. norvegica (err., non A. Boeck 1861!), A. Boeck in: Forh. Selsk. Christian., 1870 p. 138 | 1891 U. marinus (part.), T. Stebbing in: Tr. zool. Soc. London, v.131 p.7 | 1893 U. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, ».20 p. 664. L. 5 mm. Moray Firth. U. igrostrata Dana 1853 & 55 U. irrostratus, J. D. Dana in: U.S. expl. Exp., v.1311 p. 922 t.62 f.6a—f | 1891 D.i., T. Stebbing in: Tr. zool. Soe. London, v. 131 p- 10 | 1893 U. irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 664. Antenna 1, flagellum 6- or 7-jointed, accessory flagellum 2- or 3-jointed. Peraeo- pods 4 and 5, finger nodulose on front margin. Sooloo Sea. U. rubra Giles 1888 U. ruber, G. M. Giles in: J. Asiat. Soc. Bengal, 0.57 p.246 t.11 !1893 D. r., A. Della Valie in: F. Fl. Neapel, 0.20 p. 895. Colour bright briek red. L. about 3 mm. Bay of Bengal (Banks of Chittagong). Surface. 8. Gen. Urothoides Stebb. 1891 Urothoides (Sp. un.: U. lächneessa), T. Stebbing in: Tr. zool. Soc. London, v.131 p. 26. oO. Head with obtusely produced and deflexed rostrum. Antennae 1 and 2, mouth-organs, gnathopods 1 and 2, peraeopods 1 and 2 nearly as in Urothoe (p. 128). The anterior gastrie lobes (triturating organs) scantily armed, not profusely as in Urothoe. Peraeopods 1—5, finger slender, not nodulose. Peraeo- pod 3, 24 joint expanded but not quadrate, 4!" wider than 5t". Peraeopod 4 with 24, 4th and 5th joints much expanded, 4tk longer and wider than 5th, Peraeopod 5 much shorter than peraeopod 4, 24 joint greatly expanded and produced, as long as rest of limb, which is not expanded. Uropod 1, rami stiliform, subequal, almost smooth; uropod 2 much smaller, rami slender, smooth, subequal; uropod 3, outer ramus of 2 equal joints, inner spiniform, not half the length of the outer. Telson little longer than broad, cleft nearly to the base, apices acute, not dehiscent. — JS unknown. 1 species. 1. U.lachneössa (Stebb.) 1888 Urothoäl., T. Stebbing in: Rep. Voy. Challenger, v.29 p.825 t.57 | 1893 Urothoe lachneessa, A. Della Valle in: F. Fl. Neapel, v.20 p.667 t.60 f.13 | 1891 Urothoides lachneössa, T. Stebbing in: Tr. zool. Soc. London, v.131 p.26. Back covered with a sort of bristly down. Head at the base and peraeon dorsally very broad. Pleon segment 2 without plumose setae; segment 3, postero-lateral angles rounded. Eyes wanting or not perceived. Bl SU BE una En > u hehe aa lb a Urothoides, Phoxocephalidae 183 Antenna 1 in O, flagellum shorter than pedunele, 5-jointed, accessory flagellum 2-jointed. Antenna 2 in O, ultimate joint of pedunele shorter than penultimate, each with a few strong spines, flagellum 2- or 3-jointed. Gnathopod 1, finger nearly as long as the oval hand; no row of pectinate spinules on distal margin of 5th joint was noticed. Peraeopod 4, the large 24 joint with front margin setose, hind margin sinuous, 4! widening and 5!" narrowing distally. Peraeo- pod 5, 24 joint strongly serrate behind, produced below the 4'% joint. Telson broad at base, narrowing gradually to the acute apices. L. about 4 mm. ‘ Cumberland Bay [Kerguelen Island]. Depth 236 m. 5. Fam. Phoxocephalidae 1857 Phoxides, Bate in: Ann. nat. Hist., ser.2 v.20 p.525 | 1865 Subfam. Phoxina, W.Lilljeborg in: N. Acta Soe. Upsal., ser.3 v.6nr.1p.18|1871 Subfam. Phoxinae, A. Boeck in: Forh. Selsk. Christian., 1870 p.133 | 1885 Phoxidae, G.O.Sars in: Norske Nordhavs- Exp., v.6 Crust. I p. 154 | 1891 Phoxocephalidae, G. ©. Sars, Crust. Norway, v. 1 p. 142. Body fusiform. Hooded rostrum covering base of antenna, lateral comers of head obsolete, postero-antennal angles distinet. Side-plates rather large, 15 — 4th obtusely truncate, hinder lobe of side-plate 5 the deeper. Pleon segments 4—6 in d narrower than in Q. Eyes dorsal, lateral or wanting. Antennae more or less modified in C, short in ©, accessory flagella well developed. Epistome not projecting. Upper lip rounded. Inner lobes of lower lip usually small. Mandible short, cutting edges distinetly developed, molar variable, seldom large, palp rather large. Maxilla 1, inner plate small, palp I- or .2-jointed. Maxilla 2, plates short, rounded at apex. Maxillipeds, plates small, palp large. Gnathopods 1 and 2 generally similar in form, hands subchelate, large, with palmar tooth fortified by a spine. Peraeopod 4 the longest. Peraeopod 5 (Fig. 37, 38) short, 24 joint greatly expanded. Branchial vesicles simple. Pleopods stronger in S than in 9. Uropod 3 often varying sexually, outer ramus the longer, 2-jointed. Telson cleft to or nearly to the base. Marine. 7 genera, 23 accepted, 7 doubtful species. Synopsis of genera: j Maxilla 1, palp 1-jointed — 2. \ Maxilla 1. palp 2-jointed — 5. Mandible, molar well developed... .. » l. Gen. Phoxocephalus . p. 134 J 2 \ Mandible, molar feebly developed — 8. Maxillipeds, 34 joint of palp with strongly 3 | N 2. Gen. Leptophoxus . . p. 136 Maxillipeds, 34 joint of palp with apex not strongly produced — 4. 4 | Gnathopods 1 and 2 alike in size and shape 3. Gen. Paraphoxus. . . p. 137 “-) Gnathopods 1 and 2 differing in size and shape 4. Gen. Metaphoxus. . . p.138 N en Se er 5. Gen. Harpinia . . . . p.140 “ \) Eyes present — 6. l Peraeopods3 and 4, 4thjointstrongly expanded 6. Gen. Pontharpinia . . p. 145 6 ! Peraeopods 3 and 4, 4th joint not strongly & \ N a ER 7. Gen. Parharpinia. . . p. 147 14 Phoxocephalus 1. Gen. Phoxocephalus Stebb. 1842 Phoxus (non Billberg 1820, Coleoptera!) (part.), Kreyer in: Naturh. Tidsskr., v.4 p.150 | 1842 Spinifer (non Rafinesque 1831, Mollusca! fide: L. Agassiz, Nomenel. zool., Moll. p.84) (part.), (Holbell in MS.) Kroyer in: Naturh. Tidsskr., v4 p.151 | 1888 Phoxocephalus (nom. nov.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.810 | 1891 P., G. ©. Sars, Crust. Norway, v.1 p.143 | 1893. P. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 738. Body compressed. Hood more or less acute. Side-plates with a few san: setae on lower margin, 4!" not much expanded backward, 5t" with hind lobe rounded. Antenna 1 shorter than antenna 2, the latter in d with long filiform flagellum, calceoliferous. Mandible with well developed molar and 24 and 34 joints of palp not greatly expanded.- Maxilla 1, outer plate with 7—9 spines, palp 1-jointed, small, with slender spines. Maxilla 2, plates nearly equal. Maxillipeds, outer plates scarcely larger than inner, fringed with curved spine-teeth, 39 joint of palp oval. Gnathopod 2 larger than gnathopod 1. Peraeopod 3 short, Fig.» 2° joint expanded. Peraeopods 3 and 4, 4" and 5% joints P.holbölli. not expanded. Peraeopod 5 (Fig. 37), 24 joint large, elypei- ae & form. Uropod 3 in ©, inner ramus unarmed, much shorter than Sars] outer, in © much larger than in O, both rami well developed, lanceolate, fringed with plumose setae. Telson,. lobes rather narrow, especially in C. 3 species accepted, 4 doubtful. Synopsis of the accepted species: 1 :Byen ill dtexelopet „u. aa nt 1. P.holbölli . . p.134 | Eyes well developed — 2. | Gnathopod 2, 6th joint not longer than broad . . . 2. P.bassi . .'. p.136 \ Gnathopod 2, 6th joint longer than broad. . . . . 3. P. kergueleni . p. 135 1. P. holbölli (Kroyer) 1842 Phoxus h. (Spinifer spinosissimus + 8. flagelli- formis Holbell in MS.), Kreyer in: Naturh. Tidsskr., v.4 p. 151 | 1845 P.h., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.551 | 1876 P. holboliü, S. I. Smith (& Harger) in: Tr. Connect. Ac., v.3 p.29 | 1888 Phoxocephalus holbölli, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1891 P.h., G.O. Sars, Crust. Norway, v.1 p.144 t.49 | 1893 P.h., A. Della Valle in: F. Fl. Neapel, v.20 p.740 | 1853 Phoxus kroyeri, Stimpson in: Smithson. Contr., v.6 nr.5 .p.58. Body glabrous. Hood acute, triangular, postero- -antennal corners of head nearly quadrate. Side-plate 1 little expanded below, 1% —34 with about 10 setae on hinder part of lower margin, 4% angled at the emargination. Pleon segment 3, postero-lateral augles slightly rounded. Eyes small, nearly round, an irregular mass of whitish pigment without any trace of visual elements (Sars). Antenna 1, 15? joint rather longer than 22 and 39 combined, flagellum 6-, accessory flagellum 4-jointed. Antenna 2, penultimate joint of peduncle rather large, with 3 rows of spines, flagellum in Q 6-jeinted, in O with numerous joints, nearly reaching end of body. Gnathopods 1 and 2, 6" joint oblong oval, a little dilated distally, palm shorter than hind margin; gnathopod 2 only a little larger than gnathopod 1. 'Peraeopod 3, 24 joint broader above than below. Peraeopod 4 about half the length of the body. Peraeopod 5 (Fig. 37), 24 joint as long as rest of limb, as broad as long, hind margin strongly curved, finely serrate. Uropod 3 in O, inner ramus scarcely half as long as outer, 24 joint of.outer less than half length of 1%; in S rami nearly equal, narrowly lanceolate, plumose, outer with 3 spines on outer margin. Telson much longer than broad, cleft to Phoxocephalus 135 the base, narrowing distally, with 2 spinules and a setule on each rounded apex. Colour (rather variable) light buff changing to BERUSS: with opaque 'whitish shadows. L. 7 mm. Arctic Ocean; North-Atlantic, North-Sea, Skagerrak, Kattegat and Baltie (Seandinavia, Great Britain, France, North-America). Sandy bottom, depth 38—94 m. 2. P.bassi Stebb. 1888 P.b., Phoxus b., T.Stebbing in: Rep. Voy. Challenger, v.29 p.811 t.54 | 1893 Phoxocephalus b., A. Della Valle in: F. Fl. Neapel, v.20 p. 743. > unknown. — d. Hood with narrowly rounded apex, postero-antennal corners subquadrate. Side-plate 1 well expanded below, with 14 setae, 24—4th with about 10 setae, 4th pair nearly quadrate, but a little deeper than broad, 5th with hind lobe little deeper than front. Pleon segment 3, postero-lateral angles rounded, segment 4 dorsally impressed. Eyes large, irregularly quadräte, dark in spirit. Antenna 1, flagellum 8-jointed, with calceoli, accessory flagellum 5-jointed. Antenna 2, calceoli on ultimate joint of peduncle, flagellum 37-jointed, nearly reaching end of body. Mandible, 3 spines in spine-row, molar small, but strongly dentate. Maxilla 1, outer plate with 9 spines. . Maxillipeds, 6 spine-teeth on margin of outer plates. Gmnathopod 1, 5th joint triangular, nearly as long as 6th, 6th oblong, twice as long as broad, palm convex, only slightly oblique, the finger with a membranous cap over the tip. Gmathopod 2 much larger, 5tt joint small, with the 4!" forming a cup for- the hand or 6% joint, which is as broad as long, slightly widened at the palm, the palmar tooth strong. Peraeopods 1 and 2, spines at apex of 5th joint nearly as long as 6** joint, finger small. Peraeopods 3—5 and uropods 1—3 nearly as in P. holbölli. Telson much longer than broad, scarcely tapering, cleft almost to the base, 1 spinule and 1 setule on each apex. L. 10 mm. Bass Strait. Surface. 3. P. kergueleni Stebb. 1888 P. k., Phoxrus k., T. Stebbing in: Rep. Voy. Challenger, v.29 .p.816 t.55 | 1893 Phoxocephalus k., A. Della Valle in: F. Fl. Neapel, v.20 p. 742. Hood with tolerably acute apex. Side-plate 1 a little expanded below, with 5 setae on lower margin, 4! little deeper than broad, hind margin convex, oblique, 5t% with hind lobe much deeper than front. Pleon segment 3, postero-lateral angles rounded. Eyes small, distant, not dark in spirit. Antenna 1, flagellum 5-, accessory flagellum 3-jointed. Antenna 2, ultimate joint of peduncele half length of penultimate in J, more than half in oO, flagellum in © with 5 joints, in young © without calceoli with 15 rather stout joints. Mandible, E 3 spines in spine-row, molar strongly dentate, 34 joint of palp shorter than 24 in ©, equal to it in S. Maxilla 1, outer plate apparently with only 7 spines. Maxillipeds, outer plates with 3 spine-teeth. Gnathopod 1, 5t" joint much shorter than 6%, which is oblong, much broader than half the length, _ palm convex, slightly oblique. Gnathopod 2, 4t-and 5th joints short, side by side, 6'% much as in gnathopod 1, but much larger both in oO and d, the palm more oblique and palmar tooth stronger. Peraeopods 1 and 2, apical spine on 5th joint longer than 6tk joint. Peraeopod 3, 24 joint as broad below as above. Peraeopod 5, 24 joint very broad, longer than rest of limb, hind margin slightly serrate, descending below the 4" joint. Uropod 3 in young J, inner ramus longer than 1° joint of outer, 24 joint of outer half length of.1%. Telson not greatly longer than broad, not cleft to the base but beyond the middle, with a long spine at each broad apex. L. 5 mm. Cumberland Bay [Kerguelen Island]. Depth 226 m. B. @ ® 2 5 Bi: 4 E 3 Br: E 2 F . P=- E B > Ar > en a a mr 136 Phoxocephalus, Leptophoxus P. erythrophthalmus (Catta) 1875 Phoxus e., Catta in: Rev. Sei. nat., ».4 p. 163 | 1888 Phoxocephalus e., T. Stebbing in: Rep. Voy. Challenger, v».29 p. 1717. Differs from P. holbölli by the very perfect eyes. Mediterranean. P. geniceulatus (Stimps.) 1855 Phoxus g., Stimpson in: P. Ace. Philad., v.7 p- 382 | 1888 Phoxocephalus g., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1893. P. g., A. Della Valle in: F. Fl. Neapel, v. 20. p. 748. Rostrum long, acute. Eyes white. Antenna 1, flagellum and accessory flagellum equal, 10-jointed. Peraeopods 1 and 2, 4th and 5th joints dilated. Uropod 3, rami unequal, outer long, 3-jointed. Colour white. L. 6 mm. North-Pacific (Japan). . P. obtusus (Stimps.) 1855 Phoxus o., Stimpson in: P. Ac. Philad., v.7 p.382| 1888 Phoxocephalus o., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1717. L. 6 mm. North-Paeific (Japan). P. simplex (Bate) 1857 Phoxus kröyerii (non P. kroyeri Stimpson 1853!), Bate in: Ann. nat. Hist., ser.2 v. 19 p. 140 | 1857 P. simplex, Bate in: Ann. nat. Hist., ser.2 v.20°p.525 | 1888 Phoxocephalus s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1893 P.s., A. Della Valle in: F. Fl. Neapel, v.20 p.743 | 1896 P.s., A.O. Walker in: Ann. nat. Hist., ser. 6 v.18 p. 157. Plymouth Sound. 2. Gen. Leptophoxus 0. Sars 1891 Leptophoxus (Sp. un.: L. falcatus), G. O. Sars, Orust. Norway, v.1 p. 146. Body much compressed. Hood slightly carinate and deflexed at apex. Side-plates with a few simple setae on lower margin, 4! broad, 5tk with hinder lobe subtruncate. Antenna 1 much smaller than antenna 2. Antenna 2, peduncle stout, flagellum in © short, in S long and slender. Mandible, cutting- plates, spine-row and molar feebly developed, 24 and 34 joints of palp expanded. Maxillae 1 and 2 about as in Phoxocephalus (p. 134). Maxillipeds, inner plates very small, acuminate, 34 joint of palp strongly produced ät outer apex. Gnathopods 1 and 2, 6" joint nearly quadrangular, that of gnatho- pod 2 much the larger. Peraeopod 3, 24 joint much expanded. Peraeopod 4, except 24 joint, very slender.. Peraeopod 5, 24 joint large and elypeiform. Uropod 3 alike in S and O, inner ramus very small, spiniform, outer slender with spines but no setae. Telson as in Phoxocephalus. 1 species. 1. L. falcatus (O.Sars) 1871 Phoxus simplex (err., non Bate 1857!), A. Boeck in: Forh. Selsk. Christian., 1870 p.135 | 1876 P.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.217 t.8 f.3 | 1882 P. falcatus, G. O. Sars in: Forh. Selsk. Christian., nr.18 p.84 | 1888 Phoxocephalus f., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1717 | 1893 P. f., A. Della Valle in: F. Fl. Neapel, 0.20 p. 739 t.60 f.15, 16 | 1891 Leptophoxus f., G. O. Sars, Crust. Norway, v.1 p.147 t.50. Body very slender, especially in d. Apex of hood- hook-like.. Side- plates 1—3 each with 3 small setae at lower hind corner, 1° expanded below, 4!" as broad as deep, almost reetangular below the emargination. Pleon segment 3, postero-lateral angles obtuse. Eyes wanting. Antenna 1, 18? joint thiek, much longer than 24 and 34 combined, flagellum 5-, accessory Slam 4 Luz 0 a u miea rd Dal Aal zus f y li aa hg re fl a Bed Ai a a tn u lee Leptophoxus, Paraphoxus 137 flagellum 3-jointed. Antenna 2 in Q nearly twice as long as antenna 1, 'bent, flagellum 5-jointed, scarcely half length of peduncle, in C nearly as long as body. Maxillipeds, 34 joint of palp produced to a narrow conical process tipped with 4 plumose setae. Gnathopod 1, 6!" joint narrow quadrangular; gnatho- pod 2, 6! joint nearly twice as large, subquadrate; in both palmar tooth stout. Peraeopod 3, 24 joint as broad as long, hind margin evenly rounded. Peraeopod 4 nearly half length of the body. Peraeopod 5, 24 joint shorter than rest of limb, narrower above than below, slightly serrate, as broad as long. Uropods 1 and 2, rami slender, unarmed. Üropod 3, inner ramus extremely small, outer slender, elongate, 24 joint spiniform, about half length of 1°, Telson cleft to the base, slightly dilated in the middle, each apex narrow. tipped with a spinule and setule. Colour whitish, pellueid. L. 4 mm. Arctic Ocean, North-Atlantic, North-Sea and Skagerrak (Norway, Bohuslän). Depth 56---376 m. 3. Gen. Paraphoxus (). Sars 1891 Paraphoxus (Sp. un.: P. oculatus), G. O. Sars, Crust. Norway, v.1 p. 148. Body rather stout. Hood not carinate or deflexed. Side-plates 1—4 with several simple setae on lower margin, 4" rather broad, 5% with hind lobe rounded. Eyes well developed. Antennae l and 2 in Onearly equal, antenna 2 in Cd, flagellum of moderate length, slender, calceoliferous. Mandible, cutting edges and spine-row well developed, molar feeble, tipped with spinules, palp narrow with few setae Maxilla 1, palp 1-jointed, well developed. Maxilla 2, inner plate smaller than outer. Maxillipeds, inner plates obtusely rounded at apex, 39 joint of palp not produced, 4" slender, curved. Gnatho- pods 1 and 2 alike in structure. Peraeopods 1—5 about as in Phoxocephalus (p. 134). Uropod 3 in ©, inner ramus much smaller than outer. Uropod 3 in 9 much larger than in ©, inner ramus nearly as long as outer, both plumose. Telson with rather narrow lobes. . l species accepted, 1 incompletely described. l. P. oculatus (O0. Sars) 1879 Phoxus o., G. O.Sars in: Arch. Naturv. Kristian., v.4 p.441 | 1885 P.o., G. O. Sars in: Norske Nordhavs-Exp., ©.6 Crust. I p. 154 t. 13 f. 4a—e | 1888 Phoxocephalus o., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1717 | 1893 P.o., A. Della Valle in: F. Fl. Neapel, v.20 p.740 t.5 f.5; t.35 f. 19—28 | 1891 Paraphoxus o., G. ©. Sars, Crust. Norway, v.1 p.149 t.51. Body more tumid in © than im Cd. Hood with rounded apex. Side-plate 1 a little expanded distally, with about 14 setae, 2% with about 8 (Sars; 4 and 6 in Della Valle’s figures), 4!" as broad as long, expansion evenly rounded. Pleon segment 3, postero-lateral angles produced in a broad linguiform lobe. Eyes in O small, rounded, brownish, in © very large, oblong oval or reniform, dark. Antenna l in 0, 1° joint as long as 2 and 3 combined, flagellum rather shorter than pedunele, 7-jointed, accessory flagellum 4-jointed; ind with a dense brush on inner side of 1° joint, flagellum subequal to peduncle, calceoliferous. Antenna 2 in O, flagellum 8-jointed, in S scarcely longer than half the body, penultimate and antepenultimate joints of peduncle densely hairy, ultimate with 2 calceoli, flagellum 20-jointed. Gnathopods 1 and 2, 6% joint oval, a little widened distally, palm shorter than the hind margin, palmar tooth rather short; this joint a little smaller in gnathopod 2 than in gnatho- podl. Peraeopods1 and 2, 7!k joint fully as loug as 6%, Peraeopod 3, 24 joint oblong, much longer than broad. Peraeopod 4 very slender, much longer than half the body. Peraeopod 5, 24 joint obliquely expanded, as long as 138 Paraphoxus, Metaphoxus rest of limb, not so broad as long, hind margin distinctly serrate, over- lapping the 4" joint. Uropod 3 in Q, inner ramus scarcely half length of outer, conical, in d rami subequal, lanceolate, plumose. Telson, apices obliquely truncate, with 3 apical setules. Colour greyish white, semi-pellueid, or tending in parts to yellowish. L. © 5, 9 4 mm. Arectie Ocean, North-Atlantie and North-Sea (Norway, depth 38—-188 m; Jan Mayen; Greenland, depth 377 m; France); Mediterranean. P. maculatus (Chevreux) 1888 Phoxus m., Chevreux in: Bull. Soc. zool. France, v.13 p.40 | 1893 P. m., A. Della Valle in: F. Fl. Neapel, v.20 p.743 | 1888 Phoxo- cephalus m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1899 Paraphoxus m., Chevreux in: C.-R. Ass. Frang., Sess. 27 v.2 p. 477. Perhaps identical with P. oculatus. L. 35 mm. North-Atlantie (lat. 46° N., long. 7° W.). 4. Gen. Metaphoxus Bonnier 1896 Metaphoxus (Sp. un.: M.typicus), J. Bonnier in: Ann. Univ. Lyon, v.26 p.650. Hood not carinate or deflexed. Side-plates I—4 with few setae on lower margin, 5tk with hind lobe rounded. Eyes well developed. Antennae 1 and 2 in O short.. Antenna 2 in C, flagellum long, slender, calceoliferous. Mandible, eutting edges and spine-row well developed, molar feeble, 34 joint of palp distally rather expanded, carrying setaee Maxilla 1, inner plate without setae, palp 1-jointed, linear, not very elongate. Maxilla 2, inner and outer plate subequal. Maxillipeds, outer plates reaching beyond inner, but not greatly, 3% joint of palp not apically produced. Gnathopods 1 and 2 unequal, differing somewhat in shape. Peraeopods 1—5 about as in Phoxocephalus (p. 134). Uropod 3 as in Paraphoxus (p. 137). Telson with lobes not very narrow. 3 species. Synopsis of species: f Peraeopod 4, 4th joint much shorter than 5th ... 1. M.typicus . . . p.138 1 \ Peraeopod 4, 4th joint not much shorter than 5th — 2. Gnathopods 1 and 2, palm forming acute angle ö | with hind margin of 6th joint . ....... 2. M. fultoni . . . p.139 | Gnathopods 1 and 2, palm forming obtuse angle with hind margin of 6th joint ........ 3. M. pectinatus . p.139 1. M. typicus Bonnier 1896 M. t., J. Bonnier in: Ann. Univ. Lyon, v. 26 p: 630 t£. 37 £.1. Extremely near to M. peetinatus (p. 139). Head, postero-antennal angle distinet. Eyes round, small, well developed, remaining black in spirit. Antenna 1 in © short, flagellum 4-jointed, accessory flagellum nearly as long, 3-jointed.. Antenna 2, ultimate joint of peduncle shorter than the stout penultimate, flagellum 4-jointed. Gmathopod 1, 6*R joint oblong, palm slightly oblique, defined by a small tooth. Gnathopod 2 larger, distally _ widened, palm more convex and more oblique, defined by a considerable tooth. Peraeopods 1 and 2, finger almost as long as 6th joint. Peraeopod 4, 24 joint very convex in front, 4!" much shorter than 5th, Peraeopod 5, 24 joint nearly as wide as length of rest of limb. Uropod 3 in ©, inner ramus very short, outer long, 2-jointed. Telson eleft nearly to base, lobes rather dehiscent near the apices, each of which has 3 spines. 1.9 a little over 5 mm. Bay of Biscay. Depth 950 m. 1 Er Ya Bar" Sa pn Are a a ae Dasiäten an u 5 2% WANT ee el Eu Fri 2 y ı* u h f pe Fi TAN. ii eh a nk te" Eh Een zu TE RN ER ERIRELS: NE Metaphoxus : 139 2. M. fultoni (T. Scott) 1890 Phoxocephalus f., T. Scott in: Rep. Fish. Board Seotl.. v.8 p.397 1.12 f.10—12; t.13 f.13—19 | 1892 P. f., D. Robertson in: P. nat. Hist. Soc. Glasgow, n. ser. v.3 p. 207 | 1896 P. f., Calman in: Tr. Irish Ac., v. 30 p. 743 t.31 £.1,2| 1893 P. chelatus, A. Della Valle in: F. Fl. Neapel, v.20 p. 742 t.5 £.10: t.85 £. 29-35. Body compressed, especially in d. Hood nearly straight, not very long. Side-plate 1 expanded distally, 1t—34 with 3 or 5 setae, 4th as broad as long, with pretty evenly rounded hind margin. Pleon segment 3, postero- lateral angles squarely rounded. Eyes well developed, dark, larger in Cd. Antenna 1 in ©, 1° joint as long as 24 and 34 combined, flagellum shorter than pedunele, 4-jointed, accessory flagellum 3-jointed; in JS longer, 1° joint with dense brush, flagellum longer than peduncle, 5- or 6-jointed with 1 or 2 calceoli, terminal setae long, accessory flagellum 3-jointed. Antenna 2 in Oo about "/, longer, flagellum very short, 3-jointed; in S about as long as body, penultimate joint of peduncle and 2 preceding joints densely hirsute, ultimate joint with 1 ealceolus, flagellum about 22-jointed, ealceoliferous. Palp of mandible not very slender. Maxilla I, the 1-jointed palp narrow but rather long. Gmathopods 1 and 2, 5" joint rather longer and more triangular in gnathopod 1, the subquadrate 6t" joint narrower, but in both the front margin of this joint is shorter than’ the hind one, with which the oblique convex palm forms an acute angle, ‘thus tending to a chelate form. Peraeopods 1 and 2, apiecal spine of 5" joint sometimes shorter than 6! joint. Peraeopod 3 as in Paraphoxus oculatus (p. 137). Peraeo- pod 4 not very slender, about equal '/, length of body, hind margin of 2 joint a little produced, 4 joint as long as 5%. Peraeopod 5 rather longer in SO than in O, 24 joint as long as rest of limb, nearly as broad as long, overlapping 39 joint, hind margin crenate, with setules. Uropod 3 in Q short and stout, inner ramus half length of 1° joint of outer, in S more elongate, inner ramus equal to 1° joint of outer, both with long plumose setae. . Telson deeply eleft, lobes truncate, with 1 spinule and some’ setules. Colour greyish pellueid, with violet tinting on middle of back. L. 2:5 mm. Firth of Clyde, Firth of Forth, Menai Strait, Galway Bay; Gulf of Naples. From low water to 40 m. 3. M. pectinatus (A. Walker) 1896 Phoxocephalus simplex (err.?, non Phoxus s. Bate 1857!). Calman in: Tr. Irish Ae., 0.30 p. 748 t.32 f.3 | 1896 P. peetinatus, A. O. Walker in: Ann. nat. Hist., ser.6 v.17 p.343 t.16 f. 1-6; v.18 p.156 | 1899 Meta- phoxus p., Chevreux in: ©.-R. Ass. Franc., Sess. 27 0.2. p. 477. Hood slightly deflexed at the apex, postero-antennal corners slightly rounded. Side-plate 1 well expanded distallv, 15°—34 with 3 or 4 simple setae on lower margin, 4" little deeper than broad, hind margin convex, oblique, 5th with hind lobe much deeper than front. Pleon segment 3, postero-lateral - angles slightly rounded, segment 4 with 1 or 2 spinules-en dorsal tuberele (C). Eyes round, dark, large, especially in d. Antenna 1, 1° joint longer than 24 and 3% combined, upper margin produced in C, flagellum 4-jointed, in S with 2 calceoli and ending in a long seta, accessory flagellum 3-jointed. Antenna 2, flagellum in Q 4-jointed, as long as the stout penultimate joint of peduncle, in J about */, length of body, calceolated. along with ultimate joint of peduncle. Mandible with spine-row, molar rudimentary (at least in 5), 24 joint of palp longer than 34, 34 distally expanded, carrying many setae. Gnathopod 1 smaller than gnathopod 2, with less oblique palm and less powerful palmar tooth, in both gnathopods joints 4 and 5. combining to form a small cup for the large 6'" joint, which in gnathopod 1 is much 140 Metaphoxus, Harpinia longer than broad, a little tapering distally, while in gnathopod 2 it widens a little distally, with a length not much exceeding its considerable breadth. Peraeopods 1 and 2, 7% joint about °/, length of 6'". Peraeopod 4 nearly ?/, length of the body, 4!" joint as long as 5%. Peraeopod 5, 24 joint as long as rest of limb, not quite so broad as long, hind margin with about 3 shallow teeth, not produced below the 4% joint, joints 3 and 4 in 9 with plumose setae, joint 5 m J with 3 or 4 curved blunt spines forming comb on distal half of front margin. Uropod 3 in Q as in Phoxocephalus holbölli (p. 134), in S inner ramus as long as 1° joint of outer, the latter without spines on outer margin. Telson as in P. holbölli. L. 3 mm. Firth of Clyde; English Channel (Guernsey, depth 13 m; France). 5. Gen. Harpinia Boeck 1842 Phoxus (part.) (Spinifer Holbell in MS., part.), Kreyer in: Naturh. Tidsskr., v.4 p.150 | 1871 Harpina.(non Burmeister 1844, Coleoptera!), A. Boeck in: Forh. Selsk. Christian., 1870 p. 135 | 1876 Harpinia, A. Boeck, Skand. Arkt. Amphip., v.2 p.218 | 1888 H., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 819 | 1891 H., G. O. Sars, Crust. Norway, v.1 p.150 | 1895 H., A. Della Valle in: F. Fl. Neapel, v. 20 p. 744. Body rather broad. Head with evenly vaulted hood, not carinate or deflexed. Side-plates plumose, 4th broadly produced backward, 5t" with oblique hind lobe. Eyes wanting. Antenna 1, 1° joint very large, carrfing sensory bristles and in J densely setose, accessory flagellum long. Antenna 2 with many spines and setae on peduncle, of which the penultimate joint is broad. Primary flagellum not long in either antenna in either sex. No calceoli. Mandible with short cutting edge, denticulate accessory plate on left mandible, spine-row, feeble molar tipped with slender spines, palp slender, armed chiefly on truncate tip of long 39 joint. Maxilla 1, 9 spines on outer plate, palp 2-jointed. H. Fe Maxilla 2, plates subequal. Maxillipeds, plates slender, palp Peraeopod 5. elongate. In J the mouth-organs are subject to degradation. A) Gmathopods 1 and 2 similar, 6% joint oval, palm more or less oblique. Peraeopod 3, 24 joint linear. Peraeopod 4 much longer than the rest, 24 joint narrowed distally. Peraeopod 5 (Fig 38) rather small, 24 joint much expanded. Uropod 3 in © rather short, outer ramus the longer, with spines; in S longer, both rami knife-shaped, and as a rule unarmed. Telson with rounded apices. 12 species. Synopsis of species: Pleon segment 3, postero-lateral angles acutely 1 produced — 2. \ Pleon segment 3, postero-lateral angles rounded—10. | Peraeopod 5, 2djoint with apronounced spur (Fig.88) 1. H. mucronata. . p. 141 Peraeopod 5,24 joint without a pronounced spur— 8. En nn EEE ar Er KEBSRET N 2. H. crenulata . . p. 141 Pleon segment 3, postero-lateral corners not Pleon segment 3, postero-lateral eorners abruptly 5 abruptly upturned — 4. j Peraeopod 5, 2d joint deeply serrate — 5. + \ Peraeopod 5, 2d joint not deeply serrate — 6. Harpinia 141 Side-plates 1—3 with few setae, a tooth at lower ERINA-OOFHOR ET la det 3. H. pectinata . . p.142 a Side-plates 1—3 with many setae, no tooth at E Jower una armer ES ee 4. H.serrata . . . p.142 f Gnathopod 2, palm bidentate ... . 2.2... 5. H. excavata . . p.142 \ Gnathopod 2, palm not bidentate — 7. Head with postero-antennal corners much produced 6. H. antennaria. . p. 143 7 | Head with postero-antennal corners not much produced — 8. Pleon segment 3, postero-lateral corners produced INWSALRRAHFTODEN > a en 7. H. propinqua.. . p.143 ® Pleon segment -3, postero-lateral corners produced into a large tooth — 9.- Side-plates 1—4, setae on lower margin elose-set | BREINUMEFONR Se a a eye 8. H. obtusifrons . p.145 s | Side-plates 1—4, setae on lower margin not close- s BBL.:0 DUMETONB FR en 9. H.plumosa. . . p. 144 j Peraeopod 5. 24 joint with hind margin obliquely 10 DUDORED WOW a en TE, 10. H.truncata. . . p.144 | Peraeopod 5, 2d joint with hind margin rounded — 11 u | Pleon segment 4 with dorsal hump . . . ... 1l. H.abyssi. . . . p.144 Pleon segment 4 without dorsal hump . . . . . 12. H. laevis.. . . . p.145 1. H. mucronata 0. Sars 1879 H.m., G.O.Sars in: Arch. Naturv. Kristian., v.4 p.446 | 1885 H. m., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 161 t.13 £.7, 7a—g | 1891 H. m., G. O. Sars, Crust. Norway, v.1 p.157 t.54 f.3 ! 1893 H.m., A. Della Valle in: F. Fl. Neapel, v.20 p. 746 t.60 £.17. Body rather compressed, glabrous above. Hood prominent, slightly convex. Side-plates 1—3 with small tooth at lower hind corner, setae few. Pleon segment 3, postero-lateral angles slightly upturned in long spiniform process. Antennae 1 and 2 comparatively slender, accessory flagellum nearly as long as prineipal. Gnathopods 1 and 2, palm slightly longer than hind margin in 6fh joint. Peraeopod 4 not very slender, scarcely more than half the length of the body. Peraeopod 5 (Fig. 38) very small, 24 joint less expanded than usual, lower hind corner carrying a strong backward- pointing acute spur, with a slight excavation above it and a few points of serration below. Uropod 3, inner ramus as long as 1° joint of outer, 24 joint of outer not nearly half as long as 1°. Telson broader than long, apices very obtuse. Colour greyish white. L. © 5 mm. Aretie Ocean and North-Atlantie (Finmark, Greenland), North-Sea. - 2. H.crenulata (Boeck) 1871 Harpina c., A. Boeck in: Forh. Selsk. Christian., 1870 p.136 | 1876 Harpinia c., A. Boeck, Skand. Arkt. Amphip., v.2 p.221 t.8 f.2| 1891 H. e., G. O. Sars, Crust. Norway, v.1 p.158 t.55 f.2 |] 1898 H.c. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 745 | 1896 H.nana, J. Bonnier in: Ann. Univ. Lyon, v.26 p. 633 t.37 £.2. Body rather short and stout. Hood prominent. Side-plates, setae not numerous. Pleon segment 3, postero-lateral angles rounded, with a little upturned, scarcely projeeting denticle above, the margin below it sometimes erenulate; segments 1—3 dorsally densely hirsute; segment 4 with dorsal depression in d. Antenna 1, flagellum 6-jointed, accessory flagellum 5-jointed. Antenna 2, flagellum 5-jointed. Gnathopods 1 and 2, palm longer than hind margin of 6% joint, especially in the more robust gnathopod 2. Peraeopod 4 slender, ®/, length of body. Peraeopod 5, 24 joint with expansion not 142 Harpinia entirely overlapping 4 joint, hind margin in Q carrying long setae between about 12 points of serration, the lower ones bipartite; in d a few setules between 5 or 6 obseure points. Uropod 3 in O, outer ramus with 3 spines on outer margin of 1° joint, 24 joint not half length of 1%, inner ramus little more than half length of same; in G 24 joint more than half length of 1°, and inner ramus longer than. 1° joint of outer. Telson starcely broader than long, apices divergent, narrowly rounded. Colour greyish white, pellueid. L. about 4 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, depth 56— 188m; Bohuslän); Kattegat; Bay of Biscay, depth 950 m. 3. H. pectinata O. Sars 1891 H.p., G. O. Sars, Crust. Norway, v.l p.154 t.53 f.2 | 1893 H. p., A. Della Valle in: F. Fl. Neapel, v.20 p. 746. Body rather eompressed, glabrous above. Hood prominent, postero- - antennal eorners not produced. Side-plates 1—3 with small tooth at lower hind corner, setae few. Pleon segment 3, postero-lateral angles slightly upturned in rather short spiniform process. Antennae 1 and 2 comparatively slender. Gnathopods 1 and 2, palm about equal to hind margin in 6! joint. Peraeopod 4 rather slender, about half length of body. Peraeopod 5, 24 joint obliquely expanded, overlapping 4% joint, hind margin coarsely serrate with 5 or 6 unequal downward directed points. Uropod 3 in © small, inner ramus longer than 1°t joint of outer, outer with 2 spines on outer margin, 24 joint half as long as 1%. Telson small, broader than long, apices very obtuse and divergent. Colour greyish white, pellueid. L. Q 4 mm. Arctic Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, Bohuslän). 4. H. serrata O.Sars 1879 H.s.,, G. 0. Sars in: Arch. Naturv. Kristian., v4 p: 445 | 1885 H.s., G. O. Sars in: Norske Nordhavs-Exp., %.6 Crust. I p. 162 t.13 £.8, 8a—d ! 1891 H.s., G.O. Sars, Crust. Norway, v.1 p.155 t.54 f.1| 1893 3.3, 2; Della Valle ih: F. Fi. Neospel, v.20 p. 747 t.60 f. 18. Body robust, broadly vaulted. Hood rather convex with blunted tip. Side-plates without tooth at lower hind corner, setae many; 1° much widened distally, 5" with hind lobe unusually deep. Pleon segments 1—3 dorsally hirsute, postero-lateral angles of 3% with spiniform process slightly upturned. Antenna 1, 1° joint of peduncle unusually large, flagellum rather short, 5-jointed, accessory flagellum 4-jointed. Antenna 2 strong, flagellum short, 5-jointed.. Gnathopods 1 and 2, palm of 6% joint about equal to hind margin. Peraeopod 4 very slender, and much more than half length of body. Peraeopod 5, 24 joint obliquely oval, overlapping 4%, hind margin eut into 5 very large backward direeted points. Uropod 3 in O, inner ramus much shorter than 1° joint of outer, which has 4 spines on outer margin, the 24 joint minute with long apical setae. Telson broader than long, apices obtuse, not very divergent. Colour greyish white. L. Q 6 mm. Arctic Ocean (Jan Mayen; Norway?). 5. H. excavata Chevreux 1887 H.e., Chevreux in: Bull. Soe. zool. France, v.12 p.568 | 1893 H. neglecta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 747. Body elongate. Hood almost straight. Pleon segment 3, postero- lateral angles strongly produced, acutely curved upward. Antenna 2, penultimate joint of pedunele with 2 rows of strong spines. Gmnathopod 1, 6% joint long oval, palm erenulate, defined by a spine. Gnathopod 2, 6! joint more broadly oval, palm defined by a long sharp tooth, with another Harpinia 143 stout and short at its middle. Peraeoped 4 long, robust, 4!" joint with 2 very long curved apical spines, 6!" much narrower than 5*&, more than twice as long, finger short, straight, scarcely '/, as long as 6%, Peraeopod 5, 24 joint finely erenulate on regularly rounded hind margin, produced scarcely half-way down the 34, which has very long plumose setae in front. Uropod 3 a little shorter than the preceding. Telson cleft to the base, each half with 2 long plumose eilia, planted vertically near the apex.- L. 6 mm. Bay of Biseay (about lat. 43° N.). Depth 5110 m. 6. H. antennaria Meinert 1857 Phoxus plumosus (err., non Kroyer 1842!), Bate in: Ann. nat. Hist., ser.2 v.19 p.140|1862 P. p., Bate, Cat. Amphip. Brit. Mus., p. 99 t.16 f.8 | 1876 Harpinia plumosa (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.219 t.8 f.1| 1890 H.antennaria, Meinert in: Udb. Hauchs, v».3 p. 160 t.1 f.39—41 | 1891 H.neglecta, G.O.Sars, Crüst. Norway, v.1 p.155 t.53 f.1 | 1893 H.n. (part.), A. Della Valle in: F. Fl. Neapel. v.20 p. 747 t.5 £.6; t.35 f. 1—18; t. 60 f. 19. Body rather compressed. Hood prominent, postero-antennal corners drawn out to a forward pointing process. Pleon segment 3, postero-lateral . angles produced, more in O than in C, acute, slightly upturned ; segments 1—3 in O dorsally densely hirsute. Side-plates and antennae as in H. plumosa (p. 144). Gnathopods 1 and 2, palm longer than hind margin of 6!" joint, defined by a process in Q, not in d. Peraeopod 4 longer than half of body. Peraeopod 5 short, 24 joint not overlapping whole of 4", serrate points of hind margin small but sharp, about 9, with setules between. Uropod 3 slender, outer ramus with 4 spines on outer margin, 24 joint much less than half as long as inner ramus and shorter than 1° joint of outer. Telson little broader than long, apices narrowly rounded. Colour greyish white. L. © 5 mm, J rather less. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, depth 56— 282m; Bohuslän; Great Britain; France); Kattegat.. 7. H. propingua O0. Sars 1891 H.propingva, G.O. Sars, Crust. Norway, v.1 p- 156 t.54 f.2 | 1893 H. propinqua, A. Della Valle in: F. Fl. Neapel, v.20 p. 746. Body rather slender. Hood prominent, postero-antennal corners apparently quadrate. Side-plates. not densely setose. Pleon segment 3, postero-lateral angles acutely but minutely produced; segments 1—3 dorsally finely hirsute. Gnathopods 1 and 2, palm very oblique, but scarcely longer than hind margin of 6th joint. Peraeopod 4 about half length of the body. Peraeopod 5, 24 joint not completely overlapping 4", hind. margin very obscurely serrate. Uropod 3, outer ramus with 3 spines on outer margin, 2° joint more than ‚ half as long, inner ramus about equal 1° joint of outer. Telson rather short, broader than long, apices broadly rounded. L. O scarce 5 mm. Arctie Ocean (Jan Mayen). 8. H. obtusifrons Stebb. 1888 H. o., T. Stebbing in: Rep. Voy. Uhallenger, v.29 p. 820 t.56 | 1893 H. neglecta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.747. Body robust. Hood prominent, very broadly rounded at the apex. Side-plates with feathered setae very numerous. Pleon segment 3, postero- lateral angles pretty strongly upturned in a rather long acute tooth; the segment covered with a fine down. Antenna 1, 1° joint about twice as long as 24 and 3% combined, flagellum 7-jointed, accessory flagellum 5-jointed. Antenna 2, flagellum 8-jointed. Lower lip with small conical tooth at inner side of each principal lobe. Mandible, spine-row of 7—9 spines, molar unarmed. Maxillipeds, outer plates with about 14 spine-teeth on inner margin 144 Harpinia and apex, and about 7 plumose setae on outer margin; 4% joint of palp with nail shorter than the base. Gnathopods 1 and 2, palm very oblique, longer than hind margin of 6% joint; gnathopod 2 more robust than gnathopod 1. Peraeopod 4 much longer than half the body, 5t% joint longer than 4th, 6! longer than 5. Peraeopod 5, 24 joint much expanded, but longer than broad, only partiy overlapping 4 joint, the hind margin weakly and not acutely serrate. Uropod 3, outer ramus with 4 spines on outer and 2 on inner margin, 24 joint rather less than half length of 1°, inner ramus unarmed, equal 1° joint of outer. Telson about as long as broad, tapering to the broadly rounded scarcely dehiscent apices. L. © about 8 mm. Southern Indian Ocean (Kerguelen Islands). Depth 55—220 m. 9. H. plumosa (Kroyer) 1842 Phoxus plumosus, (Holbell in 'MS) Kroyer in: Naturh. Tidsskr., v.4 p.152 | 1871 Harpina plumosa, A. Boeck in: Forh. Selsk. Christian., 1870 p.135 | 1876 Harpinia p. (part.), A. Boeck, Skand. Arkt. Amphip., ©.2 p.219 t.8 £.5 | 1891 H.p., G. O. Sars, Crust. Norway, v.1 p.151 t.52 | 1898 H.p., A. Della Valle in: F. Fl. Neapel, v.20 p.749 | 1853 Phoxus fusiformis, Stimpson in: Smithson. Contr., v.6 nr.5 p.57 | 1876 Harpina f., S.1. Smith (& Harger) in: Tr. Connect. Ac., v.3 p.29. .. Body moderately compressed, glabrous above. Hood slightly projecting, apically narrow ; postero-antennal corners nearly right-angled. Side-plates 1—5 fringed with about 7, 6, 6, 10, 4 strong plumose setae. Pleon segment 3, postero-lateral angles forming long, acute, slightly upturned process. Antennal, 1° joint of peduncle very large; flagellum 6-jointed, about kalflength of peduncle, accessory flagellum 5-jointed. Antenna 2, penultimate joint of peduncle heart-shaped, flagellum 5-jointed. Maxillipeds (in attachment with peraeon instead of with head, Kroyer), outer plates armed on inner margin and apex with 7—9 serrate spine-teeth. Gnathopods 1 and 2 nearly equal, in stk joint palm shorter than hind margin. Peraeopod 4 scarcely longer than half the body. Peraeopod 5, 24 joint subquadrate, overlapping most of 4th, hind margin with 3 or 4 feeble points over a well marked excavation. Uropod 3 very short, outer ramus with 3 'spines on outer margin, 24 joint more than half length of 1%, inner ramus unarmed, longer than 1°* joint of outer. Telson broader than long, apices obtuse. Colour pale yellow. L.o 7 mm. Arctic Ocean and North-Atlantie (Greenland, Spitzbergen, Nova Scotia, Kara Sea, Siberia, America; Norway?). 10. H.truncata O.Sars 1891 H.t., G. ©. Sars, Crust. Norway, v.1 p.157 t.55 f.1 | 1893 H. erenulata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 745. O0. Body rather robust. Hood prominent. Side-plates, setae not numerous. Pleon segment 3, postero-lateral angles rounded, without denticle; segments 1—3 densely hirsute. Antenna 1, flagellum 7-jointed, accessory flagellum 6-jointed. Antenna 2, flagellum 6-jointed. Gnathopods1 and 2, palm longer than hind margin of 6'% joint, especially in the more robust gnatho- pod 2. Peraeopod 4 more than half length of body, 6t% joint elongated, with 4 recurved feathered setae on hind margin. Peraeopod 5, 24 joint much expanded, hind margin little serrate and transversely truncate below. Uropod 3, outer ramus with 5 spines on outer margin of 1 joint, 24 very small, inner ramus */, length of 1° joint of outer. Telson rather longer than broad, apices divergent. Colour greyish white. L. 6 mm. — © unknown. Trondhjemsfjord, depth 188—282 m; Skagerrak (Bohuslän). 11. H.abyssi O.Sars 1879 H.a.+ H. carinata (5), 6. O. Sars in: Arch. Naturv. Kristian., v.4 p. 443, 444 | 1885 H. a. + H. c., G. O. Sars in: Norske Nordhavs-Exp., v. 6 Crust. 1 p.157 t.13 £.5, 5a—m; p.159 t.13 f.6, 6a—e | 1891 H. a., G. O.Sars, Crust. Norway, v.1 p.160 t.56 £.1| 1893 H.a., A. Della Valle in: F. Fl. Neapel, v. 20 p. 745. Ba Ba Ya a ich ce ne a ae m else Harpinia, Pontharpinia 145 Q.Bodyrobust. Hood moderately prominent. Side-plates, setae numerous; 1% much expanded distally, 5t% with deep transverse hind lobe. Pleon segment 3, postero-lateral angles rounded, lower edge setose; segments 1—3 very finely hirsute; segment 4 with dorsal hump in both sexes. Antenna 1, 1% joint twice as long as. 24 and 39 combined, flagellum short, 7-jointed, accessory flagellum 6-jointed. Antenna 2 scarcely as long as antenna 1, flagellum 6-jointed. Penultimate joint of pedunele in both antennae 1 and 2 with dense set of plumose setae. Gnathopods 1 and 2 not very unequal, palm very oblique, much longer than hind margin of 6% joint, palmar tooth almost obsolete. Peraeopod 4 more than half length of body, 6t% joint long and slender. Peraeopod 5 very small, front margin angled, setose below, hind margin broadly rounded, little produced downward, finely erenulate below. Uropod 3 not very large, 1° joint of outer ramus with 6 spines on outer margin, 24 joint very small, inner much shorter than 1° joint of outer. Telson short, broader than long, apices divergent. Colour greyish white to rusty yellow. — J. More slender and compressed, pleon carinate, 6!" segment dorsally humped as well as 4%. Antenna 1, the expanded 1° joint of flagellum densely setose. Peraeopod 5, 24 joint, front margin almost straight, hind margin nearly smooth. Uropod 3, rami rather broad, outer with 6 setules, 24 joint minute, inner ramus nearly as long as outer. — L. 0 & 5 12mm. North-Atlantie (lat. 630°—75° N.). Depth 660—2288 m. 12. H.laevis O.Sars 1891 H.l.. G.O.Sars, Crust. Norway, v.1l p.161 t.56 f£.2 | 1893 H.1., A. Della Valle in: F. Fl. Neapel, v.20 p. 745. O0. Body stout, glabrous. Hood very prominent. Side-plates, setae very few (3). Pleon segment 3, postero-lateral angles narrowly rounded, lower margin quite smooth. Antennae 1 and 2 unusually slender, with few setae on penultimate joint of peduncle, antenna 1, flagellum 6-jointed, accessory flagellum 5-jointed. Antenna 2, flagellum 5-jointed. Gnathopods 1 and 2, palm rather oblique, subequal to hind margin of 6% joint, palmar tooth pretty strong. Gmnathopod 2 more robust than gnathopod 1. Peraeopod 4 less than half length of body. Peraeopod 5, 24 joint large, fully overlapping 4th joint, hind margin feebly erenulate. Uropod 3, 1° joint of outer ramus with 1 spine on outer margin, 24 joint more than half as long, inner ramus longer than 1° joint of outer. Telson longer than broad, apices narrowly rounded. Colour greyish white, pellucid. L. 4 mm. — Ö undescribed. Hardangerfjord and Trondhjemsfjord. Depth 94—188 m. 6. Gen. Pontharpinia Stebb. 1853 Urothoe (part.), J.D. Dana in: U. S.expl. Exp., v.1311 p.920 | 1888 Phoxo- cephalus (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1897 Pontharpinia (Sp. un.: P. pinguis), T. Stebbing in: Tr. Linn, Soc. London, ser.2 v.7 p. 32. Back broad. Hood obtuse. Eyes distinet. Antenna 1, 34 joint short, accessory flagellum many-jointed. Antenna 2, penultimate joint of pedunele long, broad, earrying setae and spines. Mandible, molar small or obsolete, palp long and slender, 34 joint shorter than 24. Maxilla 1, palp 2-jointed, Maxillipeds, outer plates short, 4! joint of palp long and slender. Gnatho- pods 1 and 2 similar. Peraeopods I and 2, 4tk joint longer than 5!" or 6, Peraeopods 3 and 4 with 24, 4th and 5th joints expanded. Peraeopod 5, expanded 24 joint greatiy produced. Uropod 3, rami lanceolate. Telson deeply cleft. 2 accepted species, 2 uncertain. Das Tierreich. 21.Lief.: T.R. R. Stebbing, Amphipoda I. 10 146 Pontharpinia Synopsis of accepted species: Peraeopod 4, 4th joint as broad as 2d .... 2.2.2... 1. P. pinguis. . p. 146 Peraeopod 4, 4th joint narrower than 2d .... 2... 2. P.rostrata . p.146 1. P. pinguis (Hasw.) 1880 Urothoe p., Hasweli in: P. Linn. Soc. N.S.Wales, v.4 p.525 t.19 f.2 | 1891 Harpinia? p., T. Stebbing in: Tr. zool. Soc. London, v. 131 p.4 | 1897 Pontharpinia p., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.33 t.9e | ?1893 Urothoe irrostrata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 667. Lower margin of side-plates and of pleon segments 1—3 more or less fringed with setae, pleon segment 3 serrulate above small produced point of postero-lateral angles. Antenna 1, flagellum in 9 9-jointed, accessory flagellum 7-, flagellum in 9 15-, accessory flagellum 10-jointed ; the joints apically oblique. Antenna 2, flagellum in 21-, in 9 10-jointed, the joints apically oblique. Maxilla 1, outer plate with 11 spines. Gnathopods 1 and 2 in oO, 5 joint broadly fusiform, 6t" widening from base, then of uniform width to the transverse palm, ?/, length of front margin strongly setose, finger in gnathopod 1 slightly over- lapping palm, but not in gnathopod 2. Gnathopod 1 ind, 6 joint a little longer than 5tk, palm not defined, finger half as long as 6t joint; gnathopod 2, 5th joint short, 6tR ovate, palm defined by a prominent angle, finger more than half as long as 6" joint. Peraeopods 3 and 4, 4 joint squarish, hind margin serrate, in peraeopod 4 deeply incised. Peraeopod 5, 24 joint membranous- looking. Uropod 1, rami slightly eurved; uropod 2, rami shorter, straight; uropod .3, rami (at least in C) setose. Telson as broad as long, apices divergent, sides (in J) setose. L. © 7°5, d 10 mm. South-Pacifie (New South Wales). ÜUast on beach. 2. P. rostrata (Dana) 1853 & 55 Urothoe rostratus, J. D. Dana in: U. S. expl. Exp., v.1311 p. 921; t.62 f.5a—p | 1876 Phoxus r., A. Boeck, Skand. Arkt. Amphip., v.2 p.214 | 1880 P.batei, Haswell in: P. Linn. Soe. N.S. Wales, 0.4 p.259 t.9 £. 3 | 1888 Phoxocephalus b. + P. rostratus, T. Stebbing in: Rep. Voy. Uhallenger, v. 29 p.1717 | 1893 P.?b.+P.?r., A. Della Valle in: F. Fl. Neapel, v. 20 p. 748, 744. Hood long, straight, obtuse. Side-plate 1 distally expanded, with a few setae (not mentioned or figured by Dana) on lower hind corner of 1° to 4th; 4th proad, a little narrowed distally, hind excavation shallow. Pleon segment 3, postero-lateral angles squarely rounded, with setae on hind margin above the angle. Eyes round (Dana), long-oval (Haswell), subrotund, large, conspicuous. Antenna 1, 1° joint about as long as 24 and 34 combined, fagellum 10—13 joints, accessory flagellum ?/, as long as primary, 6—10-jointed. Antenna 2, in © rather, in d much longer than antenna 1, penultimate joint of peduncle in O with numerous stout spines, in d (Dana) towards apex furnished with stoutreversed setae, flagellum in 9 scarcely longer than peduncle, 13-jointed, Ö (Dana) with 15 long slender joints carrying calceoli. Upper lip broadly rounded. Mandible, eutting edge sharply tridentate, spine-row of about 6 spines, molar very small, palp long and slender, 24 joint longest, a little curved, 34 with setae on obliquely truncate apex. Maxilla 1, inner plate oval, with a few apical setae, outer plate with 9 spines, palp long, 2-jointed, the short 1° joint faintly distinet. Maxilla 2, plates broad, subequal, inner with 4 spines on distal half of inner margin. Maxillipeds, outer plates scarcely reaching beyond 1° joint of palp, with 5 slender spines on inner margin, 24 joint of palp elongate, 3 with apex reaching a little beyond insertion of finger, finger not longer than 3% joint unless by inclusion of its apical spine. Gnatho- pods 1 and 2 similar, 24 rather larger than 1%, 6th joint broader than 5%, but scarcely if at alllonger, oblong, palm setulose, eurved, somewhat oblique, defined My RAN OR if Pontharpinia, Parharpinia 147 by a spiniferous process, against which the finger impinges. Peraeopods 1 and 2, 5th joint short, with long, stout, apical spine, 6!" with strong spines on lower half of hind margin, finger small. Peraeopod 3, 24 joint broadly expanded, though in one specimen much longer than broad; 4 joint distally broader than the length, subtriangular, with many spines on lower margin, 5!" narrower than 4th, subquadrate, almost surrounded by spines, 6% narrow, spinose, finger smooth, slender. Peraeopod 4, 24 joint broadly oval, with long setae on front margin, 4th Jonger and broader than in peraeopod 3, spinose, remaining joints nearly as in peraeopod 3. Peraeopod 5 much shorter than peraeopod 4, 24 joint large, the wide expansion produced to overlap 3% and 4th joints, 4h and 5th shorter but wider than 68, all three spinose, especially 5t", finger slender. Uropod 1, rami stout, 5 spines on one, 2 on the other. Uropod 2, 12 spines along margin of peduncle, rami short and stout. Uropod 3, rami in J long, subequal, plumose (Dans), i in Q outer lanceolate, plumose, with minute terminal joint, inner about °/, as long, feebly armed and narrower. Telson cleft to the base or nearly so, apices rounded, with spinule and setules on outer point. L. 6—9 mm. Sooloo Sea, Port Jackson [East-Australia]. P. grandis (Stimps.) 1857 Phoxus g., Stimpson in: Boston J. nat. Hist., v. 6 p-521 | 1888 Phoxocephalus g., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1893 P.g., A. Della Valle in: F. Fl. Neapel, v.20 p. 743. L. 12:5 mm. Entrance of San Franeisco Bay. Sandy bottom, depth 19 m. P. uncirostrata (Giles) 1890 Phoxus uneirostratus, G. M. Giles in: J. Asiat. Soc. Bengal, v.59 p.65 t.2 f.2 | 1893 Phoxocephalus u., A. Della Valle in: F. Fl. Neapel, v.20 p. 895. L. about 5 mm. Bay of Bengal (Seven Pagodas near Madras). Sandy bottom, depth 9-—-19 m. 7. Gen. Parharpinia Stebb. 1888 Phoxocephalus (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1717 | 1899 Parharpinia (Sp. typ.: Phoxus villosus), T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 207. Hood obtuse. Eyes distinet. Antenna 1, 34 joint short, accessory flagellum many-jointed. Antenna 2, penultimate joint of peduncle broad, carrying setae and spines. Mandible, molar small or obsolete, palp long and slender, 34 joint longer than 24, Maxilla 1, palp 2-jointed. 'Maxillipeds, outer plates “elongate, fringed with serrate spines on inner margin, 4th joint of palp long and slender. Gnathopods 1 and 2 similar. Peraeopods Land 2, 4*h joint longer than 5th or 6th, Peraeopods 3 and 4 with 4th and 5th joints not expanded. Peraeopod 5, expanded 24 joint moderately produced. Uropod 3, rami lanceolate. Telson deeply cleft. 1 species. 1. P. villosa (Hasw.) 1880 Phoxus villosus, Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.258 t.9 f.2a, b | 1888 Phoxocephalus v., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1717 | 1893 P. v., A. Della Valle in: F. Fl. Neapel, v.20 p.743, 744 | 1899 Phoxus v., Parharpinia sp. typ., T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.207 | 1882 Phoxus batei (err., non Haswell 1880!), G. M. Thomson in: Tr. N. Zealand Inst., v.14 p. 232 t.17 f.2a—e: 10* 148 Parharpinia, Amphilochidae Hood long, reaching almost end of pedunele of antenna 1. Side-plates 1—4, hinder half of lower margin well fringed with setae, 4" as broad as deep, excavation shallow. Pleon segment 3. postero-lateral corners subquadrate. Eyes ovate, conspicuous. Antenna 1, 1° joint as long as 24 and 34 combined, 24 with fasciele of setae, flagellum subequal to peduncle or a little longer, 13-jointed, accessory flagellum not much shorter, 10-jointed. Antenna 2, pen- ultimate joint of peduncle not greatly longer than ultimate, with long setae, flagellum rather longer than pedunele, 17-jointed. The long straight 34 joint of the mandibular palp is obliquely truncate at the apex. Palp of maxilla 1 com- paratively large. Outer plates of maxillipeds reach more than half-way along the long 24 joint of the palp and are fringed with a dozen graduated spines serrate on both edges. As in Pontharpinia pinguis (p. 146) the 34 joint of the palp is produced a little beyond the insertion of the finger, which is nearly as long as the 34 joint, not tipped with a spine. Gnathopod 1, 5tt joint much shorter than the oblong oval 6%; palm very oblique, defined by a tooth with palmar spines. Gnathopod 2, 5tt joint about as long as 6%, which is similar to that of gnathopod 1, not broader (rather broader, Haswell). Peraeopods 1 and 2, the 5tb joint has the apieal spine nearly as long as the 6t% joint, finger rather short. Peraeopod 3, 24 joint not greatly expanded, more so above than below, 4th to 6! with spines and long setae, 4" rather shorter but distally wider than 5tb, 5th wider, scarcely longer, than 6". Peraeopod 4, 24 joint strongly curved and setose in front, hind margin nearly straight. Peraeopod 5, 24 joint as broad as long, not produced to end of 4%, Branchial vesicles on gnathopod 2 and peraeopods 1—5 large. Uropod 1, peduncle little longer than the equal rami, of which one has 4 lateral spines,- the other only 1. Uropod 2, peduncle fringed with 10 outstanding spines, rami a little unequal. Uropod 3, rami longer than pedunele, not narrow, inner smooth, only a little shorter than the 2-jointed outer, which carries spines and setae. Telson as in Pontharpinia pinguis, the apices rounded, with setae at extremity of outer margin. Colour yellowish (Thomson). L. about 9—14 mm. Port Jackson [East-Australia]; Paterson Inlet [Stewart Island by New Zealand], depth 13 m. 6. Fam. Amphilochidae 1871 Subfam. Amphilochinae, A. Boeck in: Forh. Selsk. Christian., 1870 p. 129 | 1876 Subfam. A., A. Boeck, Skand. Arkt. Amphip., «.2 p.430 | 1882 Amphilochidae, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.23 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.743 | 1891 A., G. ©. Sars, Crust. Norway, v.1 p. 212. Body rather short and stout, pleon narrow and strongly flexed. Of the side-plates some and always the 4! rather or very large (Fig. 40). Antennae 1 and 2 rather short, seldom differing much in length, accessory flagellum of antenna 1 wanting or small. Upper lip apically ineised. Lower lip, inner lobes wanting or rudimentary. Mandible normal, except as to molar, which varies from feeble or obsolete to strong. Maxilla 1, inner plate small, palp 1- or 2-jointed. Maxilla 2 normal or degraded. Maxillipeds, outer plates not very large, palp long. Gnathopods 1 and 2 not very powerful. Peraeopods 1—5 slender. Branchial vesicles usually simple. Marsupial plateg often large with long setae. Uropods 1—3, rami slender. Telson entire, unarmed, (Fig. 39 p. 154). Marine. 9 genera, 19 accepted species and 7 doubtful. Amphilochidae, Amphilochus 149 Synopsis of genera: Side-plates 3 and 4, contiguous margins not 1 | exactly fitting — 2. Side-plates 3 and 4 (Fig. 40), contiguous margins exactly fitting — 5. 9 Mandible, molar small or obsolete — 3. Mandible, molar large and prominent — 4. 3 I A 1. Gen. Amphilochus.. . . p. 149 a 2. Gen. Amphilochoides . p.152 4 Mazilla 1, palp 2-jointed ........ 3. Gen. Gitanopsis . . . - p.153 Maxilla 1, palp l-jointed ........ 4 ten: Glitana ', ., ... ; p- 155 Side-plates 1—4 combined in forming lateral 5 Er e 5. Gen. Tetradeion . . . . p.157 Side-plates 1 and 2 (Fig. 40) not forming eonstituents of lateral shields — 6. 6 Mandible, molar wanting . . .». .».. 2... 6. Gen. Cyproidea . . - . p.157 Mandible, molar developed — 7. - Uropod 2 not reaching so far as uropod 3 7. Gen. Stegoplax . - . . p.158 { Uropod 2reaching at least asfar asuropod 3 — 8. h Gnathopod 1, 4th joint not greatly or acutely 4 8 eh BR 8. Gen. Peltocoxa. . .. - p. 159 B Gnathopod 1, 4th joint greatly and acutely RE RE TERTERETRITER 9. Gen. Paraeyproidea . . p.160 1. Gen. Amphilochus Bate 1862 Amphilochus (Sp. un.: A. manudens), Bate, Cat. Amphip. Brit. Mus., p. 107 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.743 | 1892 A., G.O.Sars, Crust. Norway, v.1 p.215 | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p. 593 | 1876 Calli- merus (Sp. un.: C. acudigitata), T. Stebbing in: Ann. nat. Hist., ser. 4 v.18 p. 445. Body rather stout. Rostrum curved acuminate, lateral angles of head projecting, postero-antennal corners obsolete. Side-plate 1 small, obscured, 24 —4th Jarge and deep, 4% rather strongly emarginate behind, hind lobe of 5th the deeper. Antennae small, peduncles rather long, flagella short. Antenna 1 larger in than in , without accessory flagellum. Epistome rounded in front. Upper lip distally ineised, lower lip without inner lobes. Mandible, eutting edge narrow, denticulate, accessory plate only on left mandible, molar feeble, 34 joint of palp rather long. Maxilla 1,.inner plate very small, outer probably with 7 spines, palp 2-jointed. Maxilla 2, inner plate broader than outer. Maxillipeds, inner plates elongate, outer of moderate size, palp. long, 4!" joint short. Gnathopods 1 and 2 subchelate, palm distinet, 5 joint more or less produced, finger long; gnathopod 2 the larger. Peraeo- pods 1—5 slender, subequal; peraeopods 3—5, 24 joint expanded. Uropod 2, rami unequal, uropod 3, peduncle longer than the subequal rami. Telson conically tapering, entire. } 5 species accepted, 3 doubtful. N N are, 3a ln ce a DE Lay net et a et Synopsis of accepted species: Gnathopod 1, front margin of 6th joint acutely 1 | ee 1. A. manudens . . p.150 | Gnathopod 1, front margin of 6th joint not acutely produced — 2. mn. 7 ir A, a u en > Hop EL EN EREE EN ae ee ne Se 150 | Amphilochus palm of Om... 2. A. neapolitanus . p. 150 Gnathopod 2, process of 5th joint not overlapping Gnathopod 2, process of 5th joint overlapping | palm of 6th — 3, 3 Telson longer than 3 times the breadth . . . . 3. A. tenuimanus. . p.150 Telson shorter than 3 times the breadth — 4. 4 Mandibular palp, 34 joint longer than 2d ... 4 A.marionis .. . p.151 Mandibular palp, 3d joint shorter than 24... 5. A.brunneus. . . p.löl 1. A. manudens Bate 1862 A. m., Bate, Cat. Amphip. Brit. Mus., p. 107 t. 17 f.6 | 1892 A. m., G.O. Sars, Crust. Norway, o.1 p.217 t.74 | 1893 A. m., A. Della Valle in: F. Fl. Neapel, «.20 p.594 t.59 f£.4 | 1871 A. manuidens, A. Boeck in: Forh. Selsk. Christian., 1870 p.130 | 1876 A. m., A. Boeck, Skand. Arkt. Amphip., %.2 p.432 t.11 f.1 | 1876 A. coneinna + Callimerus acudigitata, T. Stebbing in: Ann. nat. Hist., ser. 4 v.18 p.445 t.19 £.1—1b; p.445 t.20 f.3 | 1890 A. boeckii, Meinert in: Udb. Hauchs, v.3_p. 160. Head, rostrum longer in Ö than in 9, lateral corners ending in a sharp deflexed point. Side-plates deeper in O than in d, 1° subquadrate, 24 and 34 with lower margin coarsely dentate, 4! with lower and hind margin denticulate. Pleon segment 3, postero-lateral angles produced, ending in small acute point. Eyes round, dark red. Antenna 1, 1% joint apically indented, a little longer than 24, 24 than 34, flagellum in 2 about 6-jointed with slender sensory setae, in J longer, with band-like sensory filaments. Antenna 2 in o subequal to antenna 1, ind much shorter, ultimate joint of peduncle shorter than penultimate, flagellum about halflength of peduncle. Mandible, 39 joint of palp as long as 1% and 24 combined. Gnathopods 1 and 2, 6" joint widening to convex, rather oblique, denticulate palm, front margin apically produced to an acute tooth, finger slender, eurved, reaching beyond the palm, proximal half of inner margin denticulate. In gnathopod 1, 5" joint only moderately produced, in the much larger gnathopod 2, narrowly produced as far as palm margin, which forms an angle with the hind margin. Peraeopods 3—5, 24 joint oval, serrulate on hind margin, largest in peraeopod 5. Uropod 3 projecting beyond uropods 1 and 2, rami very narrow, with scattered spinules. Telson scarcely more than half length of peduncle of uropod 3, quite simple, acute, length nearly thrice breadth. Colour brownish to reddish. L. © 5, 0 4 mm. Arctic Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, Greenland, France, Great Britain); Kattegat. Depth 188 m. 2. A. neapolitanus Della Valle 1893 A.n., A. Della Valle in: F. Fl. Neapel, v.20 p.595 t.29 £. 16, 17. Eyes maroon, retieulated with white. Gnathopods 1 and 2, front margin of 6% joint not produced into an apical tooth; in gnathopod 1 process of 5th joint not reaching palm of the broad 6%; in gnathopod 2, 6th joint larger than in gnathopod 1, process of 5" joint overlapping the palm with a bent point. Other appendages in agreement with A. brunneus (p. 151). Colour greenish-brown in part, in part pearly white lightly flecked with green. L. 3—4 mm. Gulf of Naples. Among algae. 3. A. tenuimanus Boeck 1871 A. t., A. Boeck in: Forh. Selsk. Christian., 1870 p. 131 ! 1876 A. t., A. Boeck, Skand. Arkt. Amphip., e.2 p.487 t.9 f.6, 7? | 1892 A.t., G. O. Sars, Crust. Norway, v.1 p. 218 t.75 f.1 | 1893 A.t. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.595 t.59 f.5. E E : 7 ; 3 E k Amphilochus . 151 Head, rostrum long, lateral corners projecting bluntly. Side-plate 1 a little produced obtusely, 24—4th scarcely denticulated. Pleon segment 3, postero-lateral angles without any acute point. Eyes small, rounded, visual elements imperfectly developed, light red with whitish coating. Antenna 1 nearly as in A. manudens (p. 150), antenna 2 comparatively shorter and stouter, not so long as antenna 1. Mandible, 34 joint of palp rather longer than 24. Gmathopods 1 and 2 smaller and less unequal than in A. manudens, without apical tooth, palm nearly straight, irregularly denticulate, finger scarcely overlapping it, process -of 5t& joint not quite reaching the palm even in gnathopod 2. Peraeopods as in A. manudens, but uropod 3 much shorter, scarcely reaching beyond uropod 1, peduncle little longer than rami, which are without spinules. Telson overlapping peduncle of uropod 3, more than thrice as long as broad, acutely tapering. Colour pale yellowish, with light red patches. L. Q 4 mm. Aretie Ocean, North-Atlantic and North-Sea (Norway, depth 188—376 m; Firth of Clyde). 4. A. marionis Stebb. 1888 A. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 743 t.38 | 1893 A. tenwimanus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 595. 9. Side-plate 1 with front margin semicircular, 2I—4#k with lower margin only slightly erenate. Pleon segment 3, postero-lateral angles forming a scarcely perceptible tooth; segment 6 outdrawn on either side of the telson. Eyes small, oval. Mandibular palp, 3 joint longer than 1% and 24 combined. Maxillipeds, outer plates broader than in European species, distal margin finely peetinate on inner and ciliated on outer part, with a simple spine between. Gnatho- pods 1 and 2 without apical tooth to 6" joint, otherwise nearly as in A. manudens (p- 150); gnathopod 2 very much larger than gnathopod 1. Peraeopods 1—5 about as in A. manudens. Telson triangular-oval, not twice as long as broad L. about 3 mm. — G unknown. Southern Indian Ocean (Marion Island). Depth 188 m. 5. A. brunneus Della Valle ige 4A.b., A. Della Valle in: F. Fl. Neapel, v.20 p.596 1.4 £.5; 1.29 f. 1—15. Head, rostrum short, lateral corners of head obtuse. Side-plate 1 reetangular, 24—4th (as figured) quite smooth. Eyes oval, brown. Antenna 1, 1° joint rather shorter than 24, 34 very short, flagellum 6-jointed, shorter . than peduncle. Antenna 2 subequal in length to antenna 1, ultimate and penultimate joints of pedunele equal in length, flagellum 5-jointed. Mandible, 34 joint of palp shorter than 24. Gnathopods 1 and 2 without apical tooth to the 6b joint, which widens distally rather less than in other species; process of the 5tk joint does not nearly reach palm; finger does not reach beyond palm. In gnathopod 2 the hand is moderately larger than in gnathopod 1, and has a straighter front margin. Peraeopods normal. Uropod 3 the longest. Telson triangular, about °/, length of peduncle of uropod 3. Colour yellow brown to red. L. 4—5 mm. Gulf of Naples. Depth to 10 m. A.longimanus Üheyreux 1888 A. I., Chevreux in: Bull. Soe. zool. France, v.13 p.4l. L. 2 3 mm. North-Atlantie (lat. 46° N., long. 7° W.). Depth 180 m. 152 . Amphilochus, Amphilochoides A.melanops A. Walker 1894 A.m., A.O. Walker in: Rep. Brit. Ass., Meet. 63 p. 585 | 1895 A. m., A. O. Walker in: P. Liverp. biol. Soc., v. 9 p. 298 t.18 £. 12; t.19 f. 13—15. Probably identical with A. brunneus (p. 151). L. 25 mm. Menai Strait, Liverpool Bay. Depth 9—19 m. A. oculatus H. J. Hansen 1887 A. o. H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p.89 t.3 £.2—2e | 1892 A.o., G.O.Sars, Crust. Norway, ©.1 p. 226 | 1893 A. tenwi- manus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 595. L. 4 mm. Davis Strait (Godthaab, depth 47 m; Sukkertoppen, depth 9—19 m). 2. Gen. Amphilochoides,®. Sars 1892 Amphilochoides (Sp. typ.: Amphilochus odontonyx), &. O. Sars, Crust. Norway, v.1 p.220 | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p. 593. General form like Amphilochus (p. 149). Upper lip distally wider, less deeply incised. Lower lip with lobes more strongly inflexed. Mandible, molar obsolete, palp longer, 3 joint elongate. Maxilla 1, inner plate very small, outer with dentate expansion below the apical spines, palp broad, 2-jointed. Maxilla 2, plates very small, almost unarmed. Maxillipeds, plates moderately broad, not elongate, palp long. Gnathopods 1 and 2 similar, 24 much the larger, with setiferous process of 5t" joint more produced, 6th joint almost fusiform, palm being very oblique, finger long with nodiform denticle in one or both of the pairs on inner margin near hinge. 3 species. Synopsis of species: Gnathopods 1 and 2 with nodiform dentiele on 1 | Anger 4. su ns ee RE EG 1. A. boeckii . . . p.152 | Gnathopod 2, not gnathopod 1, with nodiform denticle on finger — 2. Pleon segment 3, postero-lateral angles not produced IH a WB en ed 2. A. odontonyx . p.153 Pleon segment 3, postero-lateral angles pröduced into B taoih en. an nn 3. A. intermedius . p. 153 2 1. A. boeckii O. Sars 1892 A. odontony& (err., non Amphilochus 0. A. Boeck 1871!), G. ©. Sars, Crust. Norway, v.1 p.221 t.75 f.2 | 1893 A. o., A. Della Valle in: F. Fl. Neapel, v.20 p.593 t.59 f.2,3 | 1895 A. boeckü, G. OÖ. Sars, Crust. Norway, v.1 p. 690. Head, rostrum large, much deflexed, lateral corners nearly rectangular. Side-plate 1 obliquely quadrate, lower front angle acute, 24 slightly denticulate. Pleon segment 3, postero-lateral angles produced to a distinet acute tooth. Eyes large, rounded oval, dark red. Antenna 1, 24 joint produced on inner side to acute apical process, flagellum much shorter than peduncle, about 7-jointed, carrying setae. Antenna 2 rather longer than antenna 1, ultimate joint of peduncle much shorter than penultimate, flagellum much shorter than pedunele, 7-jointed. Gnathopod 1, process of 5tk joint not reaching palm, 6th joint twice as long as broad, palm denticulate, as long as hind margin, finger with nodiform dentiele, tip much overlapping the palm. Gnathopod 2, process of 5tk joint reaching palm, 6! joint more than twice as long as A ee 1 a Zus Ye a 1 u es han Dal mi Ze REN ER N SE En a a a Ei ana Mara bahrrnn Alaeia > umera Zn ah scan al as a A A ne Ya apa ir in T ? ent f a e we ba re ur 2. . x Mi D- “ 4 ® 3 r ä BR: er Amphilochoides, Gitanopsis 153 broad, palm denticulate, much longer than hind margin, finger with nodiform denticle and slightly overlapping palm. Peraeopods 3—5, 24 joint broadly ‚expanded, hind margin serrate. Uropod 3 scarcely reaching beyond uropod 1, peduncle rather longer than rami. Telson elongate, reaching beyond peduncle of uropod 3, with a secondary dentiele on left of acute apex. Integument firm, squamose. Colour yellowish, mottled with red brown spots, limbs and distal half of pleon tinged with dark erimson. L. © 6 mm. North-Atlantie and North-Sea (West-Norway). Depth 94—282 m. 2. A. odontonyx (Boeck) 1871 Amphilochus o., A. Boeck in: Forh. Selsk. Christian., 1870 p.131 | 1876 A.o., A. Boeck, Skand. Arkt. Amphip., v.2 p.434 t.11 f.3 | 1895 Amphilochoides o., G. ©. Sars, Crust. Norway, v.1 p.690 | 1892 A. pusillus, G. ©. Sars, Crust. Norway, v.1 p. 222 t.76 £.1. Head, rostrum not very large, lateral corners somewhat produced. Side- plate 1 bluntly rounded at front corner, 24 not expanded as in the other species. Pleon segment 3, postero-lateral angles not produced into a tooth, nearly quadrate. Eyes small, rounded. Antennae 1 and 2, flagellum 5-jointed, otherwise as in A. boeckii, but smaller lobe to joint 2 of antenna 1. Gnatho- pod 1, 6*& joint scarcely twice as long as broad, palm denticulate, straight, forming a distinet angle with hind margin, Bayer without nodiform dentiele, finely ciliated on inner margin. Gmathopod 2, process of 5{" joint reaching a little beyond palm, which is very oblique, forming an obtuse angle with the short hind margin, and is not dentieulate near the hinge, finger with nodiform denticle. Uropod 3 reaching a little beyond uropod 1, pedunele much longer than rami. Telson very long and tapering, apex tridentate. L. ovigerous © under 3 mm. Arctie Ocean (Vadsö, depth 56—113 m); North-Atlantie and North-Sea (Scotland); Skagerrak, Christianiafjord and Kattegat; Liverpool Bay. 3. A.intermedius T. Scott 1896 A.i., T. Scott in: ER Fish. Board Seotl., 0.14 p.159 t.4 8.18. Close to A. boeckii, but side-plate 1 RT at lower front angle. Gnathopod 1, palm not denticulate, but fringed with minute setae, finger without nodiform dentiele, gnathopod 2, 4 joint with produced bifid apex very conspieuous, palm quite smooth. Pleon segment 3 agroes with A. boeckii, not‘ with A. odontonyx. Firth of Forth. 3. Gen. Gitanopsis ©. Sars 1892 Gitanopsis, G. O. Sars, Crust. Norway, v.1 p.223 | 1893 @., A. Della Valle in: F. Fl. Neapel, v.20 p. 598. Rostrum curved. Side-plate 1 not always exceedingly small. Upper lip ineised at narrowed apex. Lower lip with lobes narrowed in front, deeply ineised on inner margin. Mandible, cutting plate dentate, accessory plate on left mandible, spine-row well developed, molar powerful, palp with 34 joint the longest. Maxilla 1, inner plate very small, outer with (7?) spines, palp 2-jointed. Maxilla 2, well developed, inner plate broader than outer. Maxillipeds, inner plates narrow, long, outer reaching beyond 1° joint of rather robust and setose palp. Gnathopods 1 and 2 subchelate. Peraeopods 1—5, uropods 1—3 and telson (Fig. 39 p. 154) about as in Amphilochus (p. 149). 3 species. r 154 - Gitanopsis Synopsis of species; 1 [ Pleon segments 1 and 2 dorsally produced to a tooth 1. G. bispinosa . p.154 Pleon segments 1 and 2 not dorsally produced — 2. 9 [ Gnathopods 1 and 2 strong, very unequal . ... . 2. G.inermis . . p.154 Gnathopods 1 and 2 weak, not very unequal . . . 3. G.aretica. . . p.155 1. G. bispinosa (Boeck) 1871 Amphilochus b., A. Boeck in: Forh. Selsk. Christian., 1870 p.131 | 1876 A. bispinosus, A. Boeck, Skand, Arkt. Amphip., v.2 p.435 t.10 f.1 | 1892 Gitanopsis bispinosa, G. O. Sars, Crust. Norway, v.1 p.224 t.76 f.2| 1893 @. b., A. Della Valle in: F. Fl. Neapel, v.20 p.598 t.59 £.6,7. Head, rostrum rather short, lateral corners produced, scarcely obtuse. Side-plates not very large, 1°: very partially concealed, tapering to an obtuse denticulated point, 24 finely serrate on truncate distal margin. Pleon segments 1 and 2, produced dorsally to a spiniform recurved process, segment 3, postero-lateral corners quadrate. Eyes rounded oval, light red. Antennae 1 and 2 rather long. Antenna 1, 1° joint scarcely longer than 24, flagellum nearly twice as long as pedunele, with 15 joints, each with fasciele of delicate sensory setae. Antenna 2 rather longer, slender, ultimate and pen- ultimate joints of peduncle subequal, flagellum 15- or 16-jointed. Gnathopods I and 2 rather feeble, not very unequal, 5! joint scarcely narrower than 6th, the lamellar setose lobe not quite reaching the palm even in gnathopod 2, 6th joint oval, about twice as long as broad, palm convex, very oblique, not defined by any distinet angle, with small denticles and bristles on either side of it, finger hirsute. Peraeopods 1—5 slender, spinulose, in 3I—5th pairs 2% joint well expanded, especially in peraeopod 5. Uropods 1—3, rami densely spinulose, uropod 3 reaching as far as uropod 1, peduncle scarcely longer than rami. Telson conically tapering, not reaching end of peduncle of uropod 3. Colour whitish, banded with light red. L. 9 55 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, depth 94--188 m; Greenland; France; Great Britain). 2. G. inermis (0. Sars) 1882 Amphilochus i., G. O.Sars in: Forh. Selsk. Christian., nr.18 p.87 t.3 f.10 | 1892 Gätanopsis i., G. O. Sars, Crust. Norway, v.1 p. 225 t. 77 f£.1} 1893 @.i., A. Della Valle in: F. Fl. Neapel, v.20 p.598 t.59 f.8. Head, rostrum strongly eurved, lateral corners nearly quadrate. Side-plate 3 very small, obliquely quadrangular, 24 slightly expanded, distal margin rounded, coarsely dentate. Pleon segment 3, postero-lateral curners sub- - Uropods Quadrate. Eyes rather large, rounded oval. Antennae land 2 rather short, subequal. Antenna 1, 1% and 24 joints equal, flagellum 6-jointed, much shorter than peduncle. Antenna 2, ultimate and penultimate joints of peduncle equal, flagellum scarcely half length of pedunele. Gnathopods 1 and 2, resembling those of Amphilochus (p. 149), rather powerful, —- Telson re 6% joint widening to a convex, slightly oblique, dentieulate . Inermis, . . . ı Telson and palm, which is a little overlapped by the finger. In gnatho- uropod 3. pod 1, process of 5th joint not very long, palm defined by ARE AO Bean] 2 slender spines on each side. Gnathopod 2 much larger than gnathopod 1, process of 5t" joint long, slender, nearly reaching palm, which has a dense series of small hairs. Uropod 3 scarcely reaching so far back as uropod 1, peduncle rather longer than the smooth rami. . Telson longer than peduncle of uropod 3 (Fig. 39), tapering uniformly to acute apex. L. 2 under 4 mm. Varangerfjord (Vadsö [Finmark]). Depth 38—94 m. Gitanopsis, Gitana 155 3. G. arcetica O.Sars 1892 @.a., G.O.Sars, Crust.Norway, v.1 p.227 t.77f.2| 1893 @.a., A. Della Valle in: F. Fl. Neapel, v.20 p.599 t.59 f.9. Head, rostrum strongly curved, lateral corners not projecting, evenly rounded. Side-plate 1 very partially concealed, linguiform, sliehtly indented at apex, 24 distinetly dentate on rounded distal margin. Pleon segment 3, postero-lateral angles produced, but without tooth. Eyes large, oval. Antenna 1, 24 joint shorter than 1°, 39 shorter than 24, flagellum 10-jointed, much longer than peduncle. Antenna 2 longer than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum as long as peduncle, 14-jointed. Gnathopods land 2 rather feeble, not very unequal, 5tk joint with process densely setose, not nearly reaching palm even in gnathopod 2, 6t" joint scarcely wider than 5th, widening to well defined, denticulate, nearly transverse palm, finger minutely spinulose on inner margin, overlapping palm. Peraeopods 1—5 as in G. bispinosa. Uropod 3 reaching as far back as uropod 1, pedunele longer than unarmed rami. Telson scarcely reaching beyond peduncle of uropod 3, conieally tapering, minutely tridentate.e L. 9 5 mm. Varangerfjord (Vadsö |Finmark]). 4. Gen. Gitana Boeck 1871 Gitana, A. Boeck in: Forh. Selsk. Christian., 1870 p. 132 | 1892 @., @. 0. Sars, Crust. Norway, v.1 p.228 ! 1893 @., A. Della Valle in: F. Fl. Neapel, v.20 p.589. Rostrum broad at base. Side-plate 1 very small, almost concealed. Antennae 1 and 2 rather slender. Mandible well developed, molar strong, 34 joint of palp shorter than 24. Maxilla 1, palp 1-jointed. Maxilla 2, inner plate shorter and broader- than outer. Maxillipeds as in Gitanopsis (p. 153), but palp more elongate. Gnathopods 1 and 2 rather feeble, not very unequal, scarcely subchelate. Peraeopods 1—5, uropods 1—3 and telson about as in Amphilochus (p. 149). 3 species. Synopsis of species: Gnathopod 2, 6th joint shorter than front margin of 5th — 2. Gnathopods 1 and 2, 5th joint distinetly produced . 2. G. abyssicola . p. 156 Gnathopods 1 and 2, 5th joint not distinetly produced 3. G. rostrata . . p. 156 Gnathopod 2, 6th joint longer than front margin of 5th 1. G. sarsi. . . . p.155 ! | 1. G.sarsi Boeck 1871 @.s., A. Boeck in: Forh. Selsk. Christian., 1870 p.132| 1876 @. s., A. Boeck, Skand. Arkt. Amphip., v.2 p.439 t.11 f.2 | 1893 @. s., Chevreux & E. L. Bouvier in: Ann. Sei. nat., ser. 7 v.15 p.122 | 1892 @. sarsü, G.O. Sars, Crust. Norway, v.1 p.228 t.78 f.1 | ?1893 @. s. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.590 t.29 f.18—32 | 1878 Amphilochus sabrinae, T. Stebbing in: Ann. nat. Hist., ser.5 v.2 p.864 t.15 £.1. Body short and stout. Rostrum strongly curved, rather obtuse, lateral corners of head nearly quadrate. Side-plate 2 tapering to a rounded distal margin with 3 serrations in the middle, 4" pair finely serrate continuously round lower and much of hind margin. Pleon segment 3, postero-lateral angles rather produced, not dentiform in this or the other species of the genus. Eyes of moderate size, rounded oval, dark brown. Antenna 1, 24 joint slightly shorter than 1°, 34 a good deal shorter than 24, flagellum scarcely longer than pedunele, 7-jointed. Antenna 2 rather longer than antenna 1, 156 Gitana ultimate joint of peduncle rather longer than penultimate, flagellum nearly as long as peduncle. Gnathopods 1 and 2 less feeble than in the other 2 species; 5th joint in gnathopod 1 with front margin shorter than 6", produced setiferous hind margin equal to it; 5!" joint in gnathopod 2 with front margin shorter, but produced setiferous hind margin much longer than 6, which in both is narrowly oval, with faseicles of spinules on hind margin, finger rather small, hirsute on inner margin. Peraeopods 1—5 not quite so slender as in the other species, 24 joint in 3d—5tk pairs oval. Uropod 3 reaching beyond uropod 1, peduncle much longer than unarmed rami. Telson not reaching apex of peduncle of uropod 3, tapering to tridentate apex. Colour dark brown or blackish violet, the crowded spots usually in transverse bands. L. 9 about 3 mm. Aretie Ocean, North-Atlantiec, North-Sea and Skagerrak (Norway, Spitzbergen, France, Great Britain); Kattegat. Sublitoral. 2. G. abyssicola O0. Sars 1892 @.a., G.O. Sars, Crust. Norway, v.1 p.229 t. 78 f.2 | ?1898 @. sarsii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 590. Body short and stout. Head, rostrum shorter and less strongly curved than in G. sarsi (p. 155), lateral corners rather more produced. Side-plate 2 with only 2 serrations on the obtusely pointed tip, 4" quite smooth. Pleon segment 3, postero-lateral angles less produced. Eyes larger, rounder, less refractive, light red. Antennae 1 and 2 about as in G. sarsi, but flagellum of antenna 2 comparatively shorter, 6-jointed. Gmathopod 1, 5" joint little produced, little longer than 6"; gnathopod 2 longer and more slender than gnathopod 1, 5tk joint more but still not greatly produced, on both margins much longer than 6t% joint. Peraeopods 1—5 more slender, 24 joint of 32 —5th pairs broader than in G. sarsi. Uropods 1—3 and telson nearly as in G. sarsi. Colour whitish, pellueid, with patches of light red. L. © nearly 5 mm. Aretie Ocean (Selsövik [Nordland], exactly within the polar eircle). Depth 188-282 m. 3. G. rostrata Boeck 1871 @.r., A. Boeck in: Forh. Selsk. Christian., 1870 p.132 | 1876 @. r., A. Boeck, Skand. Arkt. Amphip., ©.2 p.441 t.11f.4 | 1892 G. r., G. O. Sars, Crust. Norway, v.1 p.230 t.79 f.1 | 1893 @.r., A. Della Valle in: F. Fl. Neapel, 0.20 p.592 t.59 f.1. Body less stout. Head, rostrum slightly curved, more produced, acuminate, lateral corners rounded, little produced. Side-plate 2 comparatively much larger, all the narrowly rounded distal margin serrate, 4% seemingly a little serrate. Pleon segment 3, postero-lateral angles slightly produced. Eyes small, rounded, feebly developed, light red with whitish coating. Antenna 1, 24 joint of peduncle longer than 1°, flagellum shorter than peduncle, 7-jointed. Antenna 2 much longer than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum about half length of peduncle. Gnathopods 1 and 2 very slender and feeble, 5!" joint scarcely at all produced on setose hind margin, much longer than almost linear 6!"; gnathopod 2 rather longer than gnatho- pod 1. Peraeopods 1—5 very long and slender, 24 joint of 32 —5th pairs large and laminar. Uropod 3 rather long, but scarcely reaching beyond uropod 1, peduncle much longer than the unarmed rami. Telson not reaching apex of peduncle of uropod 3, tapering to a simple apex. Colour whitish, without spots, sometimes faintly tinged with red. L. © 7 mm. Aretie Ocean, North-Atlantie and North-Sea (West-Norway). Depth 188—377 m. N = IR Tetradeion, Cyproidea 157 5. Gen. Tetradeion Stebb. 1899 Tetradeion (Sp. typ.: Cyproidia erassa) (non Tetradium J. D. Dana 1846, Cnidaria), T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 207. Body short and stout, pleon shorter than peraeon. Head small, rostrum > obsolete. Side-plates 1—4 together forming a continuous shield, the confronted _ margins of the contiguous side-plates neatly fitting, 4% much broader than Ist to 34 combined, 5! much broader than deep, fitting hind emargination of 4th, 6th and 7th concealed. Eyes well developed. Antennae 1 and 2 small. Antenna 1 the stouter, without accessory flagellum. Antenna 2, penultimate joint of pedunele shorter than antepenultimate. Mouth-parts unknown. Gmathopods 1 and 2 equal, similar, imperfectly subchelate, 4" and 5tk joints slightly produced. Peraeopods 1—5 slender, character of 24 joint unknown, but expansion rendered needless by the great extent of side-plate 4. Uropod 1, rami shorter than peduncle, subequal. Uropod 2 reaching as far back as uropod 1, rami a little unequal. Uropod 3 not reaching so far back as the other pairs, stouter, rami decidedly unequal. Telson entire oval, short. 1 species. 1. T. erassum (Chilton) 1885 COyproidia? erassa, Chilton in: Tr. N. Zealand Inst., v.15 p.80 t.3 £.1 | 1899 C©.c., Tetradeion sp. typ., T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p.207. Side-plate 1 broader than 24 or 34, but not so deep, 4" deeper than the rest, much broader than deep. Pleon segment 3, postero-lateral angles not produced. Eyes large. Antenna 1, 1° and 24 joints stout, subequal, 24 produced into a tooth over the small stout 34, flagellum 6- or 7-jointed, tapering, with long sensory filaments. Antenna 2, antepenultimate joint much longer, ultimate rather longer than penultimate joint of peduncle, flagellum subequal ultimate joint of peduncle, with 4 joints, 1° the longest. Gmnatho- pods 1 and 2, 5tk joint bluntly produced, 6t% rather narrow, slightly tapering, scarcely forming a palm for the small finger. Peraeopods 1—5 subequal, finger small. Uropods 1 and 2, the longer ramus with 2 spinules. Uropod 3, rami unarmed, one shorter, the other longer than the peduncle. Telson apically a little narrower than at base. Colour brown. L. about 3°5 mm. Lyttelton Harbour [New Zealand]. 6. Gen. Cyproidea Hasw. 1880 Cyproidea, Haswell in: Ann. nat. Hist., ser.5 0.5 p.31 | 1880 Cyproidia (part.), Haswell in: P. Linn. Soe. N.S. Wales, v.4 p. 320 | 1885 C. (part.), T. Stebbing in: Ann. nat. Hist., ser.5 ».15 p.59 | 1888 C., Peltocoxa?, T. Stebbing in: Rep. Voy. Challenger, v.29 p.513 | 1893 P. (part.), A. Della Valle in:-F. Fl. Neapel, v.20 p. 647 | 1881 Cypridoidea, E. C. Rye in: Zool. Rec., v.16 Index p.4. Body short and stout. Side-plates 1 and 2 rudimentary, 3 and 4th very large, confronted margins closely fitting, 6% and 7tk concealed. Eyes well developed. Antennae 1 and 2 small. Antenna 1, peduncle rather stout, accessory Nagellum wanting. Antenna 2 slender. Epistome strongly projeeting. Upper lip unsymmetrically bilobed. Lower lip apparently with inner lobes obsolete.. Mandible, eutting edge with numerous teeth, accessory plate on left mandible also dentate, spine-row well developed, molar wanting, palp slender, 3-jointed, -1°% joint not very short. Maxilla 1, inner plate with 1 spinule on rounded apex, outer with 7 or 8 spines, palp large, 1-jointed, Maxilla 2, inner plate 158 Cyproidea, Stegoplax the broader, both short, with 2 or 3 apical spines. Maxillipeds, inner plates: with apical margin produced at inner angle and having a denticle at the outer, 2 spinules on inner surface below the apex, outer plates short, broader than inner, not reaching end of 1° joint of palp, with 2 apical spinules, palp long, 24 joint scarcely as long as 1° or 34, finger slender, curved. Gnatho- pod 1 subchelate, 5% joint with produced process. Gnathopod 2 complexly subchelate, 5!" joint forming a chela with 6®h, but not with 7, Peraeo- pods 1—5 slender, 24 joint not expanded. Uropods 1—3, rami slender, not very unequal, shorter than peduncle. Uropod 2 extending beyond uropod 3. Telson entire. 1 species. 1. C. ornata (Hasw.) 1880 C. sp. (part.), Haswell in: Ann. nat. Hist., ser.5 &.5 p.31 | 1880 Cyproidia ornata, Haswell in: P. Linn. Soe. N.S. Wales, v.4 p.320 t.18 £.1. Head small, with small rostrum. Peraeon broad and deep. Pleon folding under, narrow, laterally angled, segment 5 very short, segment 6 produced to a point overlapping but raised above the telson. In lateral view the raised point looks obtuse and the telson pointed, the true character as seen in dorsal view being just the reverse. Side-plate 4 much the largest, with rather broad but shallow excavation behind, into which side-plate 5 neatly fits, concealing the 6% and 7, Pleon segment 3, postero-lateral corners subquadrate. Eyes rather small, rounded. Antenna 1, 24 joint longer than 1°, produced in triangular process over half the short narrow 34, flagellum slender, with 9 joints carrying hyaline sensory appendages, the last 3 joints extremely thin. Antenna 2 rather longer, gland-cone short, obtuse, ante- penultimate joint of peduncle comparatively long, with one margin sinuous, pen- ultimate jointnarrower, much longer, ultimate jointalittle shorterthan penultimate, but longer than the very thin 3-jointed flagellum including its apical spine. Projeeting edge of epistome rounded, sharp. Gmathopod 1, 24 joint narrowly oblong, rather abruptly widened some distance down, 34 at least as long as 4*h, 5th triangular, hind margin setulose, inner margin and apex of process carrying spines, 6!" tending to oval but front nearly straight, palm long, scarcely defined, matched by the long finger, which has much of inner margin finely serrulate. Gnathopod 2, 24 joint a little widened downward, 34 very short, but hind apex produced to a long curved narrow process, tipped with a spine, 4th with short process, tipped with 2 spines, 5tk with broad base nearly as long as 6t%, and a tapering process which reaches the truncate apex of oblong 6%, the short finger overlapping the serrulate rounded angle of the 6! and tip of 5t". Peraeopods 1—5, 24 joint long, and narrow, finger short; in peraeopods 1 and 2, 4% joint rather longer than 5th or 6th, but not so in following pairs. Uropod 1, peduncle very long, slender, rami much shorter, equal. Uropod 2 similar to uropod 1, but shorter. Uropod 3, pedunele stouter than in uropods 1 and 2, outer ramus rather shorter than inner. Telson oblong, apex roundly truncate. Colour light pink, with minute brown and red dots forming a lobed pattern on the side-plates. L. reaching 5 mm. Port Jackson, Port Stephens and Watson’s Bay [East-Australia]. 7. Gen. Stegoplax 0. Sars 1882 Stegoplax (Sp. un.: S.longirostris), G. O. Sars in: Forh. Selsk. Christian,, nr.18 p.88 | 1892 S., G. ©. Sars, Crust. Norway, v.1 p. 232. Stegoplax, Peltocoxa 159 Body short and stout. Head boldly rostrate. Side-plates 1 and 2 rudimentary, 34 and 4tk very large, confronted margins closely fitting, 6!" and 7tk not con- cealed (Fig. 40). Eyes feebly developed. Antennae 1 and 2 and mouth-parts as in Cy- proidea (p. 157), except that the mandible has a well developed molar, and the maxillipeds have the apex of inner plates transverse, not oblique, and outer reaching end of 1° joint of palp. Gnathopods 1 and 2 subequal, similar, scarcely subchelate, slender, 5t joint a little produced. Peraeopods 1—5 slender, but 24 joint expanded in 4 and 5% pairs. Uropod 3 larger than uropod 2, Fig. Ver e and reaching much beyond it. Telson entire. A 1 species. 1. S.longirostris O. Sars 1882 8.1, G. O.Sars in: Forh. Selsk. Christian., nr.18 p.88 t.3 f£.11 | 1892 $.2,, G. O. Sars, Crust. Norway, v.1 p.232 t.79 f.2 | 1893. ‚Peltocoxa I., A. Della Valle in: F. Fl. Neapel, v.20 p. 650 t.59 f£. 64, 65. Head, rostrum very long, slightly curved, acuminate. Side-plates 1 and 2 concealed, 3 and 4 with the margins in a uniform curve to the emargination of the 4b, which almost completely receives the 5tk; 5tl deeper behind than in front. Pleon segment 3, postero-lateral angles rather produced backward, not acutely; segment 6 with 2 longitudinal ridges apically acute (Fig. 40).. Eyes small, rounded, 3 components, pigmentred with whitish coating. Antennal, 1? joint as long as 24 and 3% combined, flagellum with 5 joints, 15° much the largest, all with long band-like sensory filaments. Antenna 2, ultimate joint of pedunele twice length ofpenultimate, flagellum with 4 joints, 1° much the longest. Gnatho- pods 1 and 2 similar, 6 joint narrow, scarcely longer than 4 and 5th combined, palm not distinetly defined, minutely eiliated, with 2 spinules in gnathopod 1, and one in the narrower gnathopod 2, 5th joint produced behind to a setiferous lobe, finger slender, finely spinulose on inner margin. Peraeopods 1 and 2 very slender, longer than the others. Peraeopods 4 and 5, 24 joint with sinuosity in hind margin of expansion. Uropod 3 much longer than uropod 2, peduncle longer than the slender unarmed rami. Telson conically triangular and flattened, reaching end of pedunele of uropod 3. Colour greyish white. L. © about 2 mm. Hardangerfjord, Trondhjemsfjord, Arctic Ocean (Lofoten Isles). Depth 282—565 m. 8. Gen. Peltocoxa Catta 1875 Peltocoxa (Sp. un.: P. marioni), Catta in: Rev. Sci. nat., v.4 p. 161 | 1893 P. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 647. Body short and stout. Head with very small röstrum. Side-plates and peraeopods 1—5 nearly as in Stegoplax. Eyes well developed. Antennae land 2 small. Antenna 'l much the stouter, with small, 1-jointed accessory flagellum, the prineipal flagellum having a stout 1° joint fringed with very long sensory filaments. Mouth-parts apparently in close agreement with those of Stegoplax, except that both plates of maxilla 2 are slender, and the outer plates of maxillipeds reach beyond 1° joint of palp. Gmathopod 1 scarcely subchelate, 5th joint a little produced. Gnathopod 2 strongly subchelate, 5th joint very little produced. Uropod 1 longer than uropod 2, uropod 2 longer than uropod 3 and reaching beyond it. Telson entire, large, boat-shaped. 1 species accepted, 1 doubtful. ME A Ka u 5 N 160 Peltocoxa, Paracyproidea 1. P. marioni Catta 1875 P.m., Catta in: Rev. Sci. nat., ©.4 p.161 | 1885 Cyproidia damnoniensis, T. Stebbing in: Ann. nat. Hist., ser.5 v.15 p.59 t.2 | 1893 Peltocoxa d. + P. marionis, A. Della Valle in: F. Fl. Neapel, v.20 p.648 t.30 f.19—32; t.60 £.11, 12; p. 648. Head, rostrum small. Side-plates and angles of pleon segment 3 as in Stegoplax longirostris (p.159). Eyes small, round, about 20 components, pigment red. Antenna 1, 1° joint as long as 24 and 34 combined, flagellum with 4 joints, 1%? much the longest, with long band-like filaments, accessory flagellum minute, l-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 4-jointed, tapering. Mandible, palp of very delicate structure or wanting. Maxilla 1, inner plate weak, unarmed or wanting; outer plate probably armed with 7 spines, palp rather long, though but 1-jointed. Gnathopod 1, 5tk joint slightly produced, 6" narrow, without distinet palm, with spinules on the hinder margin, finger dentieulate on inner margin. Gnathopod 2 similar to gnathopod 1, except that the 6tk joint widens distally to a distinet convex palm defined by a tooth and spinules. Peraeopods 1—3 slender, peraeopod 3 with the 4 terminal joints shorter than in peraeopods 1 and 2. Peraeopod 4, 24 joint with hind margin of expansion uniformly curved. Peraeopod 5, expansion of 24 joint subquadrate, produced broadly below the 34. Uropod 1, rami equal, uropods 2 and 3, rami a little unequal. Uropod 3 smaller than uropod 2, pedunele shorter than the serrate rami. Telson triangular, boat-shaped, reaching apex of shorter ramus of uropod 3. Colour greyish with many red spots or red and purple. L. 2:5 mm. English Channel (South-Devon), Firth of Clyde, Firth of Forth, Liverpool Bay, Gulf of Naples. P. brevirostris (T. & A. Scott) 1893 COyproidia? b., T. & A. Scott in: Ann. nat. Hist., ser.6 v.12 p.244 t.13 | 1895 C.b., A.O. Walker in: P. Liverp. biol. Soe., v.9 p. 300. .. In agreement with P. marioni, yet without aecessory flagellum to antenna 1, palp of mandible rather longer, finger of gnathopods 1 and 2 not denticulate, side- plates 6 and 7 almost entirely concealed, and 2d joint of peraeopod 5 with acutely produced lower hind corner. L. about 1:5 mm. Moray Firth. Depth 73 m, from Filograna filograna (L.) [F. implexa Berkeley). 9. Gen. Paracyproidea Stebb. 1880 Cyproidia (part.), Haswell in: P. Linn. Soc. N.S.Wales, v.4 p. 320 | 1899 Paracyproidea (Sp. typ.: Cyproidea lineata), T. Stebbing in: Ann. nat. Hist., ser. 7 0.4 p.207. Like Cyproidea (p. 157) in general, but mandible with well developed molar, maxillipeds with apex of inner plates transverse not oblique; gnatho- pods 1 and 2 much more slender, rather feebly subchelate, gnathopod 1 having the 4 joint produced along the 5t" as in Aora, gnathopod 2 with the 5t joint produced. Uropods 1—3 with rami subequal, much sborter than peduncle, 1%: and 24 reaching only a little beyond 34, telson entire, very large, strongly compressed, extending back almost to extremity of uropods. 1 species. 1. P. lineata (Hasw.) 1880 Cyproidia l., Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.321 t.18 f.2 | 1899 Cyproidea l., Paracyproidea sp. typ., T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 207. Head, rostrum very small. Pleon segments 5 and 6 very short, 6% not dorsally produced. Side-plates as in Cyproidea ornata (p. 158), but 7% perhaps a . Paracyproidea, Amphilochidarım species dubiae, Leucothoidae 161 little exposed. Eyes very large, round, red. Antenna 1, 1° and 24 joints stout, 24 a little longer than 1°, produced in a tooth over the whole of the 34, flagellum tapering, its 7 joints smooth. Antenna 2 not longer, ante- penultimate joint short, ultimate and penultimate joints of peduncle not long, subequal, flagellum 7—9-jointed, subequal to peduncle. Mandibular palp slender, 1° joint little shorter than 24 or 34. Gnathopod 1, 24 joint distally widened, hind margin very sinuous, 4% joint as long as 5%, tapering, nearly reaching apex of 5th, which is as long as 6'b, 6th narrowly oblong, slightly widened at short, eurved, sloping palm, which is overlapped by the small finger. Gnathopod 2, 24 joint straight, 4% with transversely truncate apex, narrower but not shorter than 34, 5 produced along 6%", but not reaching the palm, obliquely truncate and inner margin carrying spines, 6% widened to the oblique, eurved, spinulose palm, which is shorter than the hind margin and matches the smooth finger. Peraeopods 1—-5, 24 joint slender. Uropods 1—3, peduncle long, rami short. Telson with a very narrow triangular flattened top, thence sloping to meet the straight lower margin, the sides being flat, deep and long. Colour, numerous brown dots disposed in lines on the lateral shields and the body. L. about 2:5 mm. Port Jackson [East-Australia]. Amphilochidarum species dubiae. Amphilochus squamosus G. M. Thoms. 1880 A.s., G. M. Thomson in: Ann. nat. Hist., ser.d ©.6 p.4 t.1 f.4,4a |! 1881 A.s., G.M. Thomson in: Tr. N. Zealand Inst., v.13 p.214 t.7 f.5a,b | 1893 A.? s., A. Della Valle in: F. Fl. Neapel, v.20 p.597. Terminal joints of maxillipeds spinous, not clawed. L. about 4 mm. Dunedin Harbour [New Zealand]. Depth 7—9 m. Probolium serratipes (Norm.) 1869 P. s., A.M. Norman in: Rep. Brit. Ass., Meet. 38 p. 273. L. about 2 mm. North-Atlantie (Shetland Islands). P. spence-batei Stebb. 1876 P.s.-b., T. Stebbing in: Ann. nat. Hist., ser. 4 v.17 p. 344 t. 19 f. 4, 4a—c | 1888 Amphilochus? s.-b., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 460. Probably young of Gitanopsis inermis (p. 154). L. about 3 mm. Torbay [South-Devon]. 7. Fam. Leucothoidae 1852 Subfam. Leueothoinae, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.3ll| 1856 Leucothoides, Bate (& Westwood) in: Rep. Brit. Ass., Meet.25 p.21 | 1865 Subfam. Leucothoina, W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.6 nr. 1 p.18 | 1882 Leuco- thoidae, &. OÖ. Sars in: Forh. Selsk. Christian., nr. 18 p.27 | 1888 L., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 771 | 1892 L., @. O. Sars, Crust. Norway, v.1 p.281. Antennae 1 and 2 small, not very unequal. Antenna 1 with rudimentary accessory flagellum. Antenna 2 the more slender. Epistome (Fig. 41 p. 163) ‚produced in front. Lower lip without inner lobes. Mandible without molar, palp slender with short 39 joint. Maxilla 1, inner plate small, outer with not more than 7 spines, palp 1- or 2-jointed. Maxillipeds with outer plates small Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 11 162 Leueothoidae, Seba or rudimentary, palp well developed, 4tk joint long. Of the gnathopods one or both pairs chelate. Uropods 1—3 almost or entirely- unarmed. Telson entire. Marine. 8 genera, 14 accepted species and 7 doubtful. Synopsis of genera: 76h joints; uropod 8 uniramous . .. . . 1.Gen. Seba ..... p. 162 Gnathopod 1, chela formed between 5th and 6th joints; uropod 3 biramous — 2. Maxillipeds, outer plates rudimentary . . . . 2. Gen. Leucothoe. . . p.163 * | Maxillipeds, outerplates small,butwelldeveloped 3. Gen. Paraleucothoe . p.169 | Gnathopod 1, chela formed between 6th and 1. Gen. Seba Bate*) 1862 Seba (Sp. un.: S. innominata), (A. Costa in MS.) Bate, Cat. Amphip. Brit. Mus., p.159 | 1888 S.,, T. Stebbing in: Rep. Voy. Challenger, v.29 p.782 | 1893 S., A. Della Valle in: F. Fl. Neapel, v.20 p.773 | 1884 Teraticum (Sp. un.: T. typicum), Chilton in: Tr. N. Zealand Inst., v. 16 p.257 | 1889 Grimaldia (Sp. un.: @. armata), Chevreux in: Bull. Soc. zool. France, v.14 p. 283. Antenna 1 stouter than antenna 2, both with pedunele long, flagellum ‘short, accessory flagellum very small, 2-jointed. Upper lip with symmetrical slightly sinuous margin, epistome bluntly eonical. Lower lip without inner lobes. Mandible, eutting plate strongly dentate, accessory plate denticulate, smaller on right than on left, spine-row of 4 spines, molar obsolete, palp with 3% joint much shorter and narrower than 24. Maxilla 1, inner plate small, outer with 7 spines, palp 1-jointed. Maxilla 2, plates short, inner shorter and broader than outer. Maxillipeds, plates rather small, feebly armed, not rudimentary, palp well developed, 4 joint elongate. Gmathopod 1 chelate or subchelate; gnathopod 2 chelate, 34 joint elongate; in both the basal part of the 6" joint much larger than the thumb. Uropod 2 not shorter than the others. Uropod 3 uniramous. Telson triangular, entire. 2 species. Synopsis of species: Antenna 1, flagellum longer than peduncle; peraeopods 3—5, BA IE TERREOWE ee ee ae 1. 8S.innominata . p.162 Antennal, flagellum shorter than pedunele; peraeopods83—5, r BETH DRSRE SR ee 2. 8. saundersii . . p.163 1. S. innominata Bate 1862 8.i., (A. Costa in MS.?) Bate, Cat. Amphip. Brit. Mus., p.159 t.29 £.5. Peraeon segments subequal. Pleon segments L—3 with sinus above the postero-lateral angle, well marked in segment 3. Eyes small. Antenna 1 nearly half as long as the body, flagellum a little longer than peduncle. Antenna 2 rather shorter than antenna 1, but with peduncle equally long. Gnathopod 1, 5tk joint as broad as 6% but only half as long, 6" with chela- forming process as long as finger. Gnathopod 2 similar, but rather larger, with 5th joint rather narrower and very much shorter than 6", Peraeopods 3—5 (in fig.) with narrowly oval 24 joint. Gulf of Naples. *) Bate, 1862, attributes the authorship of the genus (and of the species innominata) probably by error to A. Costa. Br TREO NE VEBEHRN ‘ Seba, Leucothoe 163 2. S. saundersii Stebb. 1875 S.s., T. Stebbing in: Ann. nat. Hist., ser.4 v.15 p.186 t.15 f.2, 2a—c | 1888 $. s., T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 783 t.49 | 1893 $.s., A. Della Valle in: F. Fl. Neapel, v.20 p.774 t.60 f.32—34 | 1884 S. typica, Chilton in: N. Zealand J. Sei., v.2 p.230 | 1884 Teraticum typicum, Chilton in: Tr. N. Zealand Inst., v. 16 p.257 t.18 f. la—g | 1889 Grimaldia armata, Chevreux in: Bull. Soe. zool. France, v.14 p.284 f. | 1899 Seba a., Chevreux in: C.-R. Ass. Frang., Sess. 27 v.2 p.483. Side-plate 1 directed forwards, 4th not specially larger than any of the preceding (smaller than any in Chevreux’s fig.). Pleon segment 3, postero- lateral angles rounded, produced backward; segments 5 and 6 coalescent (Chevreux). Antenna 1, 1% joint thicker but rather shorter than 24, 34 about "/, length of 24, flagellum 5-jointed, accessory flagellum with 2 joints, of which the 24 is minute, Antenna 2, ultimate joint of pedunele shorter than penultimate, flagellum 3-jointed. Gmnathopods 1 and 2, 5% joint triangular, not produced, 6 with a base which in gnathopod 1 is broad and setose on the hind margin, but longer, narrower, and smooth in gnathopod 2; in both produced so as to form with the finger a perfect chela; omathopod 1 sometimes (in CS?) subchelate, 6! joint being subquadrate, with the palm transverse, crenate near the finger hinge, hollowed in the centre, with a tooth in the hollow (Chilton). Peraeopods 1 and 2 slender. Peraeopods 3—5, 24 joint oval, hind margin most serrate in the 5°" pair; 34 pair smaller than 4 or 5th, Ur opod 1, rami longer than peduncle, inner rather the longer. Uropod 2 stouter, peduncle more nearly equal to the long, subequal rami. Uropod 3, the simple ramus longer than peduncle. Telson triangular oval, end blunt. L. oO 4 mm. Strait of Magellan (Cape Virgins, depth 100 m); Algoa Bay?, from sponges; South-Paeifie (New Zealand); North-Atlantic (Azores, depth 1287 m; Belle-Ile-en Mer, depth 180 m). 2. Gen. Leucothoe Leach 1793 Subgen. Gammarellus (part.), J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p.106 | 1813/14 Leucothöe (Sp. un.: L. artieulosa), Leach in: Edinb. Ene., v. 7 p. 403, 432 | 1826 Leucothoe, Audouin in: Deser. Egypte, v. lıv p.92 | 1840 Leucothoe, O0. G. Costa, Fauna Reg. Napoli, Crost., Cat. p.5 | 1888 Leucothoe, T. Stebbing in: Rep. Voy. Challenger, v.29 p.771 | 1892 L., G. O. Sars, Crust. Norway, v.1 p. 282 | 1893 Leucothoe, A. Della Valle in: F. Fl. Neapel, v.20 p.651 | 1816 Zycesta (Sp. un.: L. furina), Savigny, Mem. An. s. Vert., v.1 p. 109. Side-plates 1—4 broad compared with their depth. Antenna 1 stouter than antenna 2, both with peduncle long, flagellum Short, accessory flagellum ofantenna 1 very small, 1-jointed. Epistome eonically projecting. Upper lip unsymmetrically bilobed (Fig. 41). Lower lip without inner lobes. Mandible, eutting edge strongly dentate, accessory plate well developed on left, very small on right, molar obsolete, 34 joint of palp much smaller than 24. Maxilla 1, inner plate very small, with 1 seta, outer with 7 spines, palp 2-jointed. . Maxilla 2, inner plate broader than outer. Maxillipeds, inner plates short and broad, partly coalesced, outer very small or rudimentary, the inner edge of the joint carrying it being sharpened, palp large. Gnathopod 1 chelate between 5th and 6 joints, 5% bulbous at base and produced into a slender Fig. 41. thumb, parallel to the 6th, 7th small, folding over apex of 5th, a erg 5 Gnathopod 2 powerful, subchelate, 5!" joint setose, produced Eee ip: along hind margin of the large oval 6%, finger strong, eurving over the long oblique palm nearly to the process of 5 joint. 11* 164 Leueothoe Peraeopods 3—5 subequal and similar. Uropod 2 much the shortest. Uropod 3, peduncle long, rami lanceolate, minutely spinulose., Telson triangular, long, unarmed. Frequently lodged in tunicates or sponges. 11 species accepted, 7 doubtful, Synopsis of accepted species: i Gnathopod 1, finger serrate . . . . . EEE p- 164 „ | Gnathopod 1, finger smooth — 2. 2 Antenna 1 in S, basal joint very tumid . . . 2. IL. pachycera . . . p.164 Antenna 1 in d, basal joint not very tumid — 38. 3 Mandibular palp extremely short... .... . 8. L. miersi. » .. . p. 165 Mandibular palp moderately short — 4. Pleon segment 3, postero-lateral -angles not 4 ineised — 5. Pleon segment3, postero-lateral anglesineised — 9. 5 Antenna 1, 34 joint not half length of 24 — 6. Antenna 1, 34 joint half length of 24 — 8, 6 Gnathopod 2, 6th joint irregularly dentieulate. 4. L. furina. ... . p. 165 Gnathopod 2, 6th joint regularly dentieulate — 7. 7 BE ER RE 5. L.spinicarpa . . p.165 rs black EHER RER .. .. 6. IL. commensalis . p. 166 8 Gnathopod 1, 6th joint widest at base . 7. L.tridens . . . . p.166 Gnathopod 1, 6th joint narrowest at base. . . 8. L. brevidigitata . p. 167 9 Gnathopod 1, 5th joint, inner margin smooth . 9. IL. richiardii . . . p. 167 Gnathopod 1, 5th joint, inner margin serrate — 10. 10 Telson twice as long as broad. . . . 2...» 10. Lines 28 55% p- 167 Telson not twice as long as broad. .... . 11. L. illjeborgii. . . p. 167 1. L. traillii G. M. Thoms. 1882 L.t., G. M. Thomson in: Tr. N. Zealand Inst., v.14 p. 234 t.18 f. 1a—d | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 652. Body rather slender. Eyes rounded, large. Antenna 1, 1° joint stout, 24 subequal, slender, flagellum 4-jointed (?). Antenna 2, peduncle rather longer than that ofantenna 1, flagellum 5-jointed, shorter than ultimate joint of peduncle. Mandibular palp very slender. Gnathopod 1, process of 5tk joint about ?/, length of 6% joint, apex acute, finger curved, about "/, length of 6% joint, inner margin finely serrate. Gnathopod 2, 5! joint produced to ?/, length of 6% and ending in a curved spine, 6tk Jarge, oval, with numerous dentations, finger half as long. Peraeopods slender, 3—5 with 24 joint wide, crenate on hind margin. Uropods 1—3, rami narrowly lanceolate; nearly smooth. Telson narrow, tapering to a subacute, entire apex. Integument rather thin, semi-transparent. L. 9 mm. Port Pegasus and Paterson Inlet [New Zealand]. Depth 9—18 m. 2. L. pachycera Della Valle 1893 L.p., A. Della Valle in: F. Fl. Neapel, v.20 p.651 t. 19 £.22, 23, 2934. Pleon segment 2, postero-lateral angles not acute, in segment 3 incised, with upturned acute angle. Antenna 1 in J, 1° joint very tumid, ellipsoidal, 24 widening from narrow base, distally truncate, flagellum 7-jointed. Antenna 2 slender, flagellum 5-jointed. Gnathopod 1, process of 5th joint irregularly serrate, uncinate at apex. Gnathopod 2, 24 joint narrow at base, 6!" elongate, Leucothoe 165 with irregular outline, finger large. Telson very short, not twice as long as broad, ending only subaeutely. Colour pearl-grey, a little interspersed with greenish-yellow, with flecks of crimson on the sides and smaller ones on the back. L. 3—4 mm. . Gulf of Naples. Depth 10—12 m, in sand. 3. L. miersi Stebb. 1888 L.m., T. Stebbing in: Rep. Voy. Challenger, v.29 "pP. 772 t.46 | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 652. Nearly allied to L. spinicarpa. Side-plate 3 tending to oblong. Antenna 1, flagellum longer than 24 and 34 joints of peduncle combined, 17—21-jointed, aecessory flagellum rudimentary, 1-jointed. Antenna 2, ultimate joint of pedunele Me a an. Bari u = Zu al ya > a Zu A al PD 7 much more than half length of penultimate, flagellum 12-jointed. Mandible with accessory plate on both mandibles multidentieulate, that on the right much the smaller, spine-row of about 30 spines, 34 joint of palp only about "/, length of 2%. Gmathopod 1, inner margin of process of 5*" joint minutely tubereulate. Gnathopod 2, palmar margin serrate more and more deeply as it approaches the finger hinge, close to which the serration is minute. Peraeopods 3—5, oval 24 joint almost imperceptibly serrate on hind margin. Uropod 3, rami little more than half as long as peduncle. Telson thrice as long as broad, tapering gradually till near the acute apex, then more rapidly. L. 12 mm. Southern Indian Ocean (Cape Agulhas). Depth 274 m. 4. L. furina (Sav.) 1816 Lycesta f., Savigny, M&m. An. s. Vert., v.1 p.109 t.4 f£.2| 1826 L.f., Audouin in: Deser. Egypte, v.lıv p.92; Crust. t.11 f.2 | 1855 Leucothoe f., W.Liljeborg in: Öfv. Ak. Förh., v.12 p.128 | 1857 L. procera, Bate in: Ann. nat. Hist., ser. 2 0.19 p. 146 | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 652. Pleon segment 3, postero-lateral angles slightly rounded, almost quadrate. Eyes irregularly oval. Antenna 1, 1% and 24 joints long, subequal, 34 fully "/, length of 2%, flagellum 8-jointed. Antenna 2, ultimate joint of peduncle not much shorter than penultimate, flagellum 4-jointed. Gnathopod 2, 5th joint apically much widened and emarginate, 6% strikingly narrowed to the finger- hinge, near to which it has a small sharp notch and a deeper one in the almost straight palm margin. L. 8 mm. Mediterranean (Egypt), North-Sea (Banff). 5. L. spinicarpa (Abildg.) 1789 Gammarus spinicarpus, Abildgaard in: O.F. Müller, Zool. Dan., ed.3 v.3 p.66 t.119 f.1—4 | 1793 Cancer (Gammarellus) s., J. F.W. Herbst. Naturg. Krabben Krebse, ».2 p. 135 t. 36 f.6, 7 | 1861 G@ammarus s., Leucothoe articulosa, A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 654 | 1892 L. spinicarpa, L. a. (err.), G. O. Sars, Crust. Norway, v.1 p.283 t.100; t.101 f.1|?1893 L. s. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 652 t.6 f.4; t.19 f.1—20 | 1804 Cancer articulosus, Montagu in: Tr. Linn. Soe. London, ®.7 p.70 1.6 f.6 | 1812 Astacus a., Pennant, Brit. Zool., ed.5 v.4 p.36 | 1813/14 Leucothöe articulosa, Leach in: Edinb. Ene., 0.7 p.403 | 1818 Gammarus articulosus, Lamarck, Hist. An. s. Vert., v.5 p.181 | 1838 G.a., „Leucothoe“ (part.)?, H. Milne Edwards in: Lamarck, Hist. An. s. Vert., ed.2 v.5 p.311 | 1826 Leucotho& articulata (err.), Audouin in: Deser. Egypte, v. lıv p- 92 | ?1851 L. denticulata, A. Costa, Fauna Reg. Napoli, fasc. April 1851 t.9 £.3. Body slender, back broadly rounded. Side-plate 1 somewhat expanded distally, front corner transversely truncate, 24 broader than deep, 34 tending to semieircular, 4! with lower front angle rounded and upper hind one a little blunted. Pleon segment 3, postero-lateral corners quadrate, with minutely produced point. Eyes oval, bright red. Antenna 1 scarcely '/, length 166 Leueothoe of body, 1°t joint with acute apical process, 24 narrower, subequal, flagellum about 16-jointed. Antenna 2 more slender, little shorter, ultimate joint ofpedunele about or a little more than half length of penultimate, flagellum 9-jointed. Mandible, 34 joint of palp more than '/, length of 24. Gmathopod 1, process of 5 joint spiniform, inner margin "quite smooth, apex slightly eurved, 6th joint parallel-sided, inner margin finely serrate, and with a row of eurved setules, finger about half its length, slender, curved. Gnathopod 2, process of 5th joint densely setose, apex serrulate, gt joint massive, oval, with acute setose apex in front, palm convex, minutely serrate; rather more strongly near the hinge of finger. Peraeopods 1—5 subequal, marginal spinules short, finger small. Peraeopod 5, the oval 24 joint more distinetly serrate than in 34 and 4b pairs. Uropod 3, rami much more than half length of peduncle. Telson thrice as long as broad, uniformly tapering to acute apex. Colour BR flesh-colour with darker transverse bands; ova in pouch EURE L. 9 14, 5 18. mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland; N depth 56—282 m; British Isles; Azores; France); Kattegat; Mediterranean? Sometimes in Ascidians. 6. L. commensalis Hasw. 1880 L.c., Haswell in: P. Linn. Soe. N.S.Wales, v.4 p.261 t.10 f.3 | 1884 L. spinicarpa var., Miers in: Rep. Voy. Alert, p. 312 | 1885 L.s. var., Haswell in: P. Linn. Soc. N.S.Wales, v.10 p.101 | 1893 L. s. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 653. Close to L. spinicarpa (p. 165). Eyes black. Antenna 1 '/, longer than antenna 2. Maxillipeds, inner plates less broadly truncate, rudimentary outer plates smaller, 1°t joint of palp more produced on the outer side. Peraeopods of varying slenderness; peraeopod 5 has the 24 joint very broadly oval, the hind margin very convex to the middle or a little below it and then obliquely truncate, the same form of margin being indicated also in peraeopods 3 and 4. Apex of telson moderately acute. Colour varying, brick-red or greenish, sometimes: light pink with innumerable minute crimson dots. L. reaching to 12—14 mm. South-Paeifie (New South Wales). In Sponges, Ascidians and other positions. 7. L. tridens Stebb. 1888 L.t., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 777 t.47 | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 653. Side-plate 1 produced forward below, 2% much broader than deep, 4th foursided, broader below than above. Pleon segment 3, postero-lateral corners quadrate. Eyes round-oval, dark. Antenna 1, 1° joint with small apical tooth, 34 half length of 24, flagellum very short, accessory flagellum shorter than the very short 1° joint of flagellum. Antenna 2, ultimate joint of pedunele nearly °/, length of penultimate, flagellum of 6 slender joints. Mandible, eutting plates as in L. miersi (p. 165), spines of spine-row fewer, 34 joint of palp rather more than half length of 24. Maxillipeds, outer plates minutely rudimentary. Gnathopod 1, process of 5% joint smooth on inner margin, apex curving round quite to hinge of finger, 6" joint rather broader at base than apex, inner margin finely serrate, finger about '/, length of 6!% joint. Gmathopod 2, apex of 5tk joint eut into 5 denticles, 6 joint broadly oval, with no outer apical process, palm with 3 little teeth near hinge of finger, rest of serration mieroscopie. Peraeopods 1—5, armature slight, finger not very small. Telson scarcely twice as long as broad, apex a little obtuse. L. 5 mm. South-Pacifice (New Zealand). Depth 2000 m. N Leueothoe 167 8. L. brevidigitata Miers 1884 L. b., Miers in: Rep. Voy. Alert, p.313 t. 34 f£.A | 1888 L. flindersi, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 779 t. 48. Side-plate 1 expanded below, scarcely produced forward, 24 not broader than long, 4" rotundo-quadrate. Pleon segment 3, postero-lateral angles not acute or ineised. Eyes oval. Antenna 1, 1° joint longer than 24, 3% more than half length of 24, accessory flagellum not longer than broad. Antenna 2, ultimate joint of peduncle a little shorter than penultimate, flagellum 4-jointed. Upper lip, the narrow lobe very short. Mandible, 10 spines in spine-row, 24 joint of palp robust, 3 narrow, half as long as 24. Maxillipeds, inner plates longer than in other species, outer very small, 4!" joint of palp with a long nail. Gmathopod 1, 24 joint moderately dilated, 5t" scarcely bulbous at base, broadly tapering to a slightly eurved apex, with a row of setae on the hind margin, 6% joint extremely narrow at base, then narrowly oval, finger extremely small. Gnathopod 2, 5% joint very short and produced ‚along the hind margin of 6!" for less than half its length; 6% joint widest distally, without apical process, palm flat, tuberculate, very long, but convex ‚and less elongate than usual in small specimens. Peraeopod 3, 2° joint with hind margin smooth, whereas in peraeopod 4 it is serrate. Telson not twice as long as broad, apex a little obtuse. L. 4—16 mm. Torres Strait (Thursday Island, Flinders Passage). Depth 13—15 m, coral mud. 9. L. riehiardii Mich. Lessona 1865 L.r., Mich. Lessona in: Atti Soc. Ital., v.8 p.426 | 1893 L.r., A. Della Valle in: F. Fl. Neapel, v.20°p.654 t.3 £.4; t.19 £.21. Agreeing almost entirely with L. spinicarpa (p. 165); differs in having a small ineision at the postero-lateral corners of pleon segment 3, and in colour; on peraeon brilliant alternating bands of red and orange, on pleon segments 1—3 large red spots in rows; the small, circular eyes pale red; antennae are red, with a white spot at apex of 24 joint of antenna 1 and of ultimate and penultimate joints of peduncle of antenna 2; side-plate 4 bright red; gnathopod 2 particoloured, red and yellow; uropod reddish. L. 6—7 mm. Mediterranean (Genoa, Naples). 10. L. incisa D. Roberts. 1888 L. furina (err., non Lycesta f. Savigny 1816)), Chevreux in: Bull. Soc. Etud. Paris, v. 11 p. (9) | 1892 L. ineisa, D. Robertson in: P. nat. Hist. Soc. Glasgow, n. ser. v.3 p. 217. Near to L. lilljeborgii, but side-plate 4 with front angle rounded, not acute; gnathopod 1, 5!" joint with tip of process strongly hooked, inner margin of 6" joint faintly erenulate, finger not very small; gnathopod 2, palm convex, faintly but broadly erenulate, finger not abruptly bent at the base; telson fully twiee as long as broad, apex almost acute. As in L. lilljeborgii, postero-lateral angles of pleon segment 3 are sharply upturned forming a sinus, and pleon segment 2 shows a similar tendeney. Also in gnathopod 1, inner margin ‚of 5tk joint is serrate. Mandible, 34 joint of palp not much shorter than 24. L. 7 mm. North-Atlantie (France; Firth of Clyde, low water and at 38 m). 11. L. lilljeborgii Boeck 1855 L. articulosa (err., non Leach 1813/14!), W. Lilje- borg in: Öfv. Ak. Förh., 0.12 p.126 | 1861 L. lilljeborgii, A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 654 | 1892 L.1;, G. O. Sars, Crust. Norway, v.1 p. 284 t. 101 f.2| 1889 L. imparicornis, A. M. Norman in: Ann. nat. Hist., ser. 6 v.4 p. 114 t.10 f.1—4| 1893 L. serraticarpa, L.lilljeborgii, A. Della Valle in: F, Fl. Neapel, v.20 p. 656 t.19 f. 24—28; p. 908. 168 Leueothoe Side-plate 1 slightly widened below, 2% broader than long, 4" pentagonal, with lower front angle acute. Pleon segment 3, postero-lateral angles acutely upturned forming a sinus. Eyes rounded triangular, dark brownish. Antenna 1 much larger than antenna 2, 1° joint without apical process, as long as 24, flagella 9-jointed. Antenna 2 slender, ultimate joint of peduncle not much shorter than penultimate, flagellum 7- or 8-jointed. Gmathopod 1, 24 joint densely setose on both margins, 5!" dilated at base, process not very slender, inner margin serrate, apex a little bent, 6% narrow, inner margin smooth, finger /, length of 6!" joint. Gmathopod 2, 5 joint tridentate at apex, 6% tapering distally, palm very oblique, its edge quite smooth and nearly straight, finger abruptly bent at base. Peraeopods 1—5 very slender, 6! joint elongate. Uropod 3, rami nearly as long as peduncle. Telson triangular oval, little longer than broad, apex well rounded. Colour pellueid with yellowish tinge and irregular orange and pinkish specks. L. © 6 mın. North-Atlantie, North-Sea and Kattegat (Kullaberg [Sweden]; Kopervik [South- west-Norway]. depth 75—113 m; Shetland Isles). L. affinis Stimps.. 1855 L.a., Stimpson in: P. Ae. Philad., v.7 p.394 | 1862 L.a., Bate, Cat. Amphip. Brit. Mus., p.378 | 1893 L. richiardii? (err., non Mich. Lessona 1865!), A. Della Valle in: F. Fl. Neapel, v.20 p. 656. L. 12:5 mm. False Bay |Cape of Good Hope]. On gravelly bottom in the coralline zone. L. antarctica Pfeff. 1888 L..a., Pfeffer in: Jahrb. Hamburg. Anst., v.5 p. 128 t.2 f.4 | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 658. Agrees generally with L. spinicarpa (p. 165). L. about 5 mm. South-Atlantie (South Georgia). L. crassimana Kossm. 1880 L.c., Kossmann, Reise Roth. Meer., v. 21 Malacost. p.131 t.13 £.9,10 | 1898 L.e., Sowinski in: M&m. Soc. Kiew, v.15 p.492 t.11 f.20—22; t.12 f.7,8 | 1884 L. spinicarpa (err., non Gammarus spinicarpus Abildgaard 1789!), Miers in: Rep. Voy. Alert, p.313 | 1893 L. s. (part.), A. Della Valle in: F. Fi. Neapel, v.20 p. 653. L. 7—7'5 mm. Red Sea, Bosphorus. L. diemenensis Hasw. 1880 L.d., Haswell in: P. Linn. Soc. N.S.Wales, ».4 p-262 1.9 f.5 | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p:653. Scarcely distinguishable from L. commensalis (p. 166). But eyes round, large; gnathopod 2, the process of the 5th joint bifurcate and the finger relatively longer. South Paeifie (Tasmania). L. gracilis Hasw. 1880 L. g., Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.263 t.10 f.2 | 1893 L. spinicarpa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 653. Not distinguished from L. commensalis or L. diemenensis (p.166, 168). L. 10 mm. South-Paeifie (Tasmania). L. grandimana Stimps. 1853 L. grandimanus, Stimpson in: Smithson. Contr., v.6 nr.5 p.51 t.3 f.37 | 1893 L.g., A. Della Valle in: F. Fl. Neapel, v.20 p. 656. Probably identical with L. spiniearpa (p.165). L. 11 mm. Fundy Bay (Granä Manan). On shelly bottom, depth 55 m. ie NE % Y. A % Ben: N Fr SV. EM wi; N ER Ei. Ben Bi, 3 Leueothoe, Paraleueothoe 169 L. stylifera Stimps. 1855 L. s., Stimpson in: P. Ac. Philad., v.7 p.383 | 1893 L. s., A. Della Valle in: F, Fl. Neapel, v.20 p. 656. L. 8 mm. North-Paeifie (Japan). 3. Gen. Paraleucothoe Stebb. 1899 Paraleucothoe (Sp. typ.: Leucothoe novae-hollandiae), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.208. Body stout; peraeon segment 1 longer than 24. Antenna 1 larger than antenna 2, with rudimentary accessory flagellum. Antenna 2, flagellum 2 shorter than pedunele. Mandible, eutting edge with few teeth, accessory plate larger on left than right mandible, molar wanting, 39 joint of palp slight, but longer than half 24. Maxilla 1, outer plate with 5 seta-like spines, palp very large, 1-jointed, with expanded base. Maxilla 2, inner plate the longer, both plates apparently almost devoid of spines- or setae. Maxillipeds, inner plates broad and long, narrow at base, coalesced, but with median line of separation, apieal margin slightly concave, the median part produced _ inward so as to give the effect of an additional pair, of plates, also coalesced, not quite reaching the apical margin of the others, but surmounted by the 3 pairs of spine-teeth usually found on the true apex, outer plates not rudimentary but small, scarcely reaching apex of 1° joint of palp, armed with a single spinule at inner apex, 2 joint of palp the shortest. Gnathopod 1 chelate between 5t" and 6f" joints, apex of 6% joint grooved to received the finger. Gnathopod 2 subchelate, 5% joint slightly produced, finger strong, but not nearly reaching process of 5 joint. Peraeopods- 3—5 subequal, 24 joint expanded. Uropod 3 reaching beyond uropod 2, pedunele longer than the smooth equal rami. Telson triangular oval. 1 species. 1. P. novaehollandiae (Hasw.) 1880 Leucothoe n.-h., Haswell in: P. Linn. Soe. N.S.Wales, v.4 p. 329 t.20 £.2 | 1884 L. n.-h., Miers in: Rep. Voy. Alert, p. 314 | 1893 L.n. h., A. Della Valle in: F. Fl. Neapel, v.20 p. 656 | 1899 L. n.-h., Paraleucothoe sp. typ., -T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 208. Head rather small. Peraeon segment 1 rather tumid, longer than any . succeeding peraeon segment. Side-plate 1 broader than 24 or 34, some- - what produced forward. Pleon segment 3, postero-lateral corners sub- quadrate, not produced. Eyes large, oval. Antenna 1, 24 joint slightly longer than 1°, or shorter, and in the latter case the 34, though much narrower is more than '/, as long as 24; flagellum 13-jointed, much shorter than peduncle, accessory flagellum like a tubercle, yet seemingly 2-jointed. Antenna 2 sub- equal in length to antenna 1, ultimate joint of peduncle sherter than penultimate, . flagellum very short, 9-jointed. Lower lip, mandibular processes quadrate. Mandible, 8 spines in the spine-row, tapering 34 joimt of palp tipped with a long spine. Maxillipeds very narrow, outer plates a little longer than broad, one overlapping the other, the peculiar structure of the inner plates making it impossible to flatten down the outer plates and elongate palps. Gnathopod 1 large in correspondence with the size of the peraeon segment 1 and its side-plate, 34 joint larger than 4b; 5th with base massive, broad and long, produced to a process shorter than base, but tapering to end of hind margin of the 6", which from a narrow base becomes subquadrate and has a grooved truncate apex, within which is almost concealed the 170 Paraleucothoe, Anamixidae, Anamixis finger, its short triangular nail and its slightly eurved upper margin alone protruding. Gnathopod 2 not much larger than gnathopod 1, 34 joint larger than 4, 5th with strongly setose, grooved, shortly produced hind part, 6! powerful, elongate, basal part broad and longer than broad, palm oblique, sharply defined, the strong finger elosing over several teeth into a rather large concave portion with which the palm ends. Peraeopods 1—5 smooth. Peraeopods 3—5, 24 joint oval, 4 a little produced downward behind. Uropods 1—3 smooth. Uropod 1 the longest, peduncle equal to the equal rami. Uropod 2, pedunele as long as the longer ramus. Uropod 3 as long as uropod 2, peduncle longer than the equal rami. Telson about as long as peduncle of uropod 3, its apex narrowly rounded. Colour light pink, nearly white. L. 18 mm. Port Jackson [East-Australia]. 8. Fam. Anamixidae 1897 Anamixidae, T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.36 | 1899 A., T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210. Side-plates 2—4 shield-like. Mandible weak. Maxillae 1 and 2 obsolete. Maxillipeds without plates. Gnathopod 1 (Fig. 42) chelate. Telson simple. Marine. 1 genus, 1 species. 1. Gen. Anamixis Stebh. 1897 Anamixis (Sp. un.: A. hanseni), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 35. Head hood-like. Side-plate 1 very small, 24—4th very large. Antenna 1, pedunele long, no accessory flagellum. Antenna 2 remote from antenna 1, more slender, flagellum small. Mouth-organs degraded and abnormal. Gnatho- pod 1 (Fig. 42) delicately chelate. Gnathopod 2 (Fig. 43) massive, complexly subchelate. Peraeopods 1—5 slender. Pleopods small. 1 species. 1. A. hanseni Stebb. 1897 A. h., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.35 1.11. Head narrowed distally, apex rounded, lateral angles indistinet. Side- plate 1 triangular, 24 the largest. Pleon segment 3, postero-lateral angles a little blunted, segment 5 very short, segment 6 projeeting on either side of the telson. Eyes round, lateral. Antenna 1 inserted below apex of head, pedunele rather long, 24 joint nearly ®/, of 1°, much more slender, 34 ?/, of 24, flagellum of 11 joints, some with sensory filaments. Antenna 2 attached near the base of head, penultimate joint of peduncle longest, ultimate joint rather longer than antepenultimate, flagellum with 4 small joints. From the slightly keeled underside ofthe head a vertical plate projects between the 24 pair of antennae, having on its truncate front edge some microscopic teeth, and sug- gesting a coalescence of the mandibles. Maxillipeds, the coalesced 24 joint showing a slight division between 2 rounded apices on the outer surface, the 34 joint like one of the joints of the palp, of which the 34 (6! of the maxillipeds) is the longest, terminal joint or finger long, slender, curved. Gmathopod 1 (Fig. 42) very slight, 5% joint wider and longer than the 24, its long slender Anamixis, Metopidae 171 curved process tipped with a needle-like spine, 6'% joint slender, tapering, together with a needle-like finger opposed to the process of the 5 joint to form a long delicate chela. Gnathopod 2 (Fig. 43), 2° joint narrow, wider distally, 3% in appearance if not im reality articulating not only with 24 and 4%, but also with the 5! and 6 joints, 5b subequal to 24, broadest at base, apically acute, not fully reaching the end of the broad 6'h joint, which is 3 or 4 times as long as broad, the palm short, oblique, tridentate, finger more than half as long as 6% joint, strong, with eurved acute tip much overlapping apex of 5th joint. Peraeopods 3—5, 24 joint ex- panded, oval. Pleo- pods with 5- or 6-join- Fir. A. Hankani. ted rami, shorter than 6b joint 5tb joint 5th joint 4th joint 34 joint Fig. 43. A. hanseni. Gmnathopod 1. peduncle. Uropod 1 Gnathopod 2. longer than uropod 2; in both the inner ramus is a little longer, the outer much shorter than the peduncle; uropod 3 unknown. Telson a little longer than broad, apex broadly rounded. L. about 3 mm. Tropical Atlantic (West Indies).. From Goniastraea varia Dana. 9. Fam. Metopidae 1899 Metopidae, T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p.210. Side-plate 1 rudimentary, side-plates 2—4 together forming large lateral shield (Fig. 47). Antenna 1 sometimes with rudimentary accessory flagellum. Upper lip bilobed. Lower lip with inner lobes eoalesced. Mandible, eutting edge dentate, molar weak or wanting, palp small, 3-jointed, 39 joint very small. Maxilla 1, inner plate very small, outer with 6 spines, palp 1- or 2-jointed. Maxilla 2, inner plate the smaller. Maxillipeds (Fig. 44, 49), inner plates coalesced or "separate, outer small or wanting, palp elongate. Gnathopod 1 (Fig. 45) simple or sometimes subchelate, generally feeble. Gnathopod 2 (Fig. 46, 50) generally robust, subchelate. Peraeopod 1 usually more slender than peraeopod 2 (Fig. 48), 24 joint little or not at all expanded in peraeopod 3, usually much but sometimes not at all in peraeopods 4 and 5. Uropods 1 and 2 biramous, uropod 3 with a single 2-jointed ramus. Telson oval, entire. The adjustment of this family is involved in much diffieulty, because in regard to many species it remains uncertain whether they have or have not an accessory flagellum to antenna 1, whether the inner lobes of the lower lip and the inner plates of the maxillipeds be or be not coalesced, and whether the maxilla 1 have the palp 1- or 2-jointed. Marine. 4 genera, 37 accepted species and 2 doubtful, Synopsis of genera: N Maxilla 1, palp 1-jointed . .:.....2.. 1. Gen. Metopa ; . . p.172 Maxilla 1, palp 2-jointed — 2. 172 Metopidae, Metopa | Peraeopods 4 and 5, 24 joint little or not at all ! N 1 Er Eee se 2. Gen. Metopella . . p. 182 | Peraeopods 4 and 5, 24 joint expanded — 3. 3 Antenna 1 with rudimentary accessory flagellum 3. Gen. Metopoides . p.185 Antenna 1 without accessory flagellum . . . . 4. Gen. Proboloides . p. 187 1. Gen. Metopa Boeck 1871 Metopa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.140 | 1876 M., A. Boeck, Skand. Arkt. Ampbip., «.2 p.451 | 1892 M., G. O. Sars, Crust, Norway, v.1 p- 248 | 1893 M., A. Della Valle in: F. Fl. Neapel, v.20 p. 634. Relative proportions of antennae 1 and 2 varying. Lower lip with inner lobes coalesced. Mandible, molar wanting, palp small, 34 joint very short. Maxilla 1, palp 1-jointed. Maxillipeds (Fig.44), inner plates coalesced almost to the’ apices, outer plates wanting. Gnathopod 1 (Fig. 45) small, seldom distinetly subchelate. Gnathopod 2 (Fig. 46) distinetly subchelate, usually strong, often differing in the two sexes. Peraeopod 3, 24 joint not expanded. Peraeopod 4 usually, peraeopod 5 always, with 24 joint expanded. Uropod 3, peduncle longer or shorter than the 2-jointed ramus. 21 species. Synopsis of species: N { Peraeopod 4, 24 joint not expanded . .. .. 1. M.esmarki. ... . p.173 Peraeopod 4, 2d joint expanded — 2. 2 Side-plate 4, lower margin sinuous — 8. Side-plate 4, lower margin not sinuous — 5. 3 Gnathopod 1, 24 joint rather broad, lamellar . 2. M.robusta. . . . p.173 Gnathopod 1, 2d joint not expanded — 4. | Peraeopod 5, 4thjoint produced sstraightdownward 3. M.sinuata . . . . p.174 4 2 Peraeopod 5, 4th joint produced downward with BCE ET IE SR rar a . .4. M. propingqua . . p.174 Gnathopod 1, finger fringed with eurved setae pe 5 or spines — 6. \ Gnathopod 1, finger not fringed with eurved setae or spines — 7. J Antennae 1 and 2 short... . „2... ...5. M. palmata. . . . p.174 \ Antennae 1 and 2 long. . . 2 .......°...6. M. elypeata . . . p.175 - | Antennae 1 and 2 markedly unequal — 8. Antennae l and 2 not markedly unequal — 18. 8 | Antenna 1 shorter than antenna 2 — 9. Antenna 1 longer than antenna 2 — 10. j Animal small, with large eyes... ..... 7. M.alderii ... . . p.175 ’ \ Animal large, with small eyes... ... ...8. M. spectabilis . . p. 176 10 Gnathopod 2, palm not deeply incised — 11. Gnathopod 2, palm deeply ineised — 12. 11 f Gnathopod 1, 6th joint nearly linear... .. 9. M.affinis ... .p.176 \ Gnathopod 1, 6th joint rather broad . . .. . 10. M.latimana . . . p. 177 Gnathopod 2, thumb-like process reaching beyond 19 | a a Ber Se 11. M. norvegica. . . p. 177 Gnathopod 2, thumb-like process not renching beyond the pale ...-.2.2:% 4... . 12. M. boeckii . . . . p.178 a ss f RT anne ia Metopa 173 13 Gmnathopod 1 distinetly subehelate . . . - - . 13. M. leptocarpa . . p.178 Gnathopod 1 not distinetly subchelate — 14. - 4 Antennae 1 and 2 long — 15. Antennae 1 and 2 not long — 17. Peraeopods 4 and 5, 4th joint narrow, scarcely 15 a N RE a EN A er 14. M. longicornis . . p. 179 Peraeopods 4 and 5, 4th joint deeurrent, not narrow — 16. 16 Side-plate 4 nearly as deep as broad. .. . . 15. M. pusilla . . . . p.179 Side-plate 4 not nearly as deep as broad . . . 16. M. aequicornis . . p.180 17 .‚Gnathopod 2, palm serrate — 18. Gnathopod 2, palm smooth — 19. 18 j Gnathopod 2, palm irregularly serrate .. .. . 17. M. borealis. . . . p.180 - 1 Gnathopod 2, palm regularly serrate . ... . . 18. M. rubrovittata . p.180 19 N A 19. M. sölsbergi . . - p.181 Gnathopod 2 feeble — 20. N N u EEE 20. M.tenuimana . . p.181 Body stout; gnathopod 2, 6th joint oblong kasarsheular Eee 21. M.invalida . . . p.182 Body slender; gnathopod 2, 6th joint oblong 20 | | 5 1. M. esmarki Boeck 1872 M.e., A. Boeck in: Forh. Selsk. Christian., 1871 p-47 | 1893 M. esmarkii, A. Della Valle in: F. Fl. Neapel, v.20 p. 644. Back round. Side-plate 4 very large. Antenna 1 in S much, in O little shorter than antenna 2, 1° joint much longer than 24, flagellum 10- or 11-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, flagellum very short. Gnathopod 1 in C slender, 4% joint produced, 5tt wider and considerably longer than the narrowly oval 6t%, which has no definite palm. Gnathopod 2 in C robust, 5!" joint cup-shaped, 6" powerful, with a deep and wide cavity between a stout process of the hind margin and a small tooth, over which the finger curves to meet the process, leaving a small cavity between its hinge and the tooth. Gnathopod 2 in © with much smaller process and cavity, the margin serrate above and below the small tooth. Peraeopods 1—5, joints slender, except the 24 of peraeopod 5, which is almost broader than deep, the 4!" of peraeopod 3, which is not much expanded, and the 4th of peraeopods 4 and 5, which is very much widened and overlaps all the next joint. Uropod 3, pedunele with 6 spines, longer than ramus. L. 90 4, d 5 mm. North-Paeifie (California). 2. M. robusta 0. Sars 1892 M.r., G. O. Sars, Crust. Norway, v.1 p. 270 1.96 £.1. Body stout, integument very firm. Head, lateral corners angular. Side- plate 4 nearly twice as large as 24 and 34 combined, lower margin very sinuous. Pleon segment 3, postero-lateral angles rather produced. Eyes round, bright red. Antennae 1 and 2 subequal. Antenna 1, flagellum longer than peduncle, 14-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, flagellum 9-jointed. Gnathopod 1, 22 joint rather broad and lamellar, 4" forming a broadly rounded setiferous lobe, 5!" very narrow and elongated, rather tapering, 6!" about half as long, linear, finger short, finely eiliated within. Gnathopod 2 powerful, as in M.norvegica (p. 177), the 4% and 5" joints both eup-shaped; 6th subquadrate, but gradually expanded towards the slightly oblique, convex, in part coarsely serrate, palm, which is defined by a strong tooth. Peraeopod 1 174 ° Metopa not like peraeopod 2, but slender, while peraeopods 2—5 are powerful, with the 4b joint expanded and produced, the finger strong, minutely serrate. Peraeopods 4 and 5 have the 24 joint expanded, in peraeopod 5 rounded quadrangular, and the 4% joint produced below the 5%. Uropod 3, peduncle with 1 spine, little longer than 1° joint of ramus, 24 joint of ramus shorter than 1%. Telson oval, obtusely pointed, with 2 pairs of strong spines. Colour whitish pellucid, with orange patches. L. O0 6 mm. Arctie Ocean and North-Atlantie (Norway). Depth 55—94 m. 3. M. sinuata O. Sars 1887 M. bruzelüi (part.), H. J. Hansen in: Vid. Meddel., ser.4 ©.9 p.97 t.4 f.2, 2a, b | 1892 M. sinuata, G.O.Sars, Crust. Norway, v.1 p.263 t. 92. £..2. Body rather compressed, not very slender. Head, lateral corners angular. Side-plate 4 broader than deep, much larger than 24 and 3% combined, lower margin sinuous. Pleon segment 3, postero-lateral corners a little produced. Eyes rather large, irregularly rounded. Antennae 1 and 2 subequal, short and stout. Antenna 1, 1° joint longer than 24 and 34 combined, flagellum little longer than peduncle, 12-jointed. Antenna 2, ultimate and penultimate joints of peduncle sub- equal, together longer than flagellum. Gnathopod 1 not weak, 6" joint longer than 5%, very narrowly oval, with 5 spinules on hind margin. Gnathopod 2, 6! joint oblong oval, palm minutely serrate, rather oblique in Q, less so in d, defined by a slight angular projection, which like the joint itself is more strongly developed in S than in 0. Peraeopods 2—5 rather stout, 24 joint in peraeopod 5 broadly oval, and 4% joint produced a little beyond 5th, Uropod 3, peduncle with 2 spines, nearly as long as ramus, of which 24 joint is shorter than 1%. Telson with 2 pairs of lateral spines, oval, apex obtuse. L. Q 4 mm. Arctic Ocean and North-Atlantie (Nordland, depth 56—75 m; Greenland). 4. M. propingua O. Sars 1892 M. propingva, G. O. Sars, Crust. Norway, v1 p- 264 1.93 £.1. Very near to M.sinuata; but antennae 1 and 2 longer and more slender, antenna 1 longer than antenna 2, 1° joint as long as 22 and 34 combined, flagellum decidedly longer than pedunele. Antenna 2, flagellum as long as ultimate and penultimate joints of pedunele combined. Gnathopod 1, 6% joint shorter than 5tt and much narrower, without spinules. Gnathopod 2 rather powerful, defining tooth of palm well developed. Peraeopod 5, 24 joint irregularly rounded, hind margin bulging in the middle, 4 joint produced in a curved lobe beyond 5!k, Uropod 3, peduncle with 3 strong blunt spines, decidedly shorter than ramus, of which 24 joint is quite as long as 1%. Telson with 3 pairs of lateral spines. Colour whitish, with dark brown stellate spots on back, brown shadows on sides. L. about 3 mm. Trondhjemsfjord. Depth 75 m. 5. M. palmata O. Sars 1892 M.p., G. O. Sars, Orust. Norway, v.1 p.272 t. 96 £.2. Body stout. Head, lateral corners subangular. Side-plate 4 larger than 24 and 34 combined, lower margin in a single curve. Pleon segment 3, postero- lateral angles little produced. Eyes round, rather large. Antennae 1 and 2 sub- equal, short. Antenna 1, 1% joint much longer than 2 and 3X combined, flagellum a little longer than peduncle, 12-jointed. Antenna 2, ultimate joint of peduncle Metopa 175 rather longer than penultimate, flagellum 7-jointed. Gnathopod 1 slender, 24 joint narrow, 4 rather long, narrowly and triangularly produced, 5! long, linear, 6! narrower and rather shorter, finger short, scale-like, fringed closely. within with long curved setae. Gmathopod 2 powerful, 5t" but not 4th joint cup-shaped, 6!" oblong quadrangular, palm transverse, gently concave, obscurely erenulate, defined by a broad setose lobe slightly emarginate at tip, finger ending with a small hook. Peraeopods 1—5 nearly as in M.robusta (p. 173), but rather less strong. Uropod 3, peduncle with 3 spines, nearly as long as ramus, of which the 24 joint is nearly as long as the 1. Telson oval, obtusely pointed, with 2 or 3 pairs of lateral spines. L. 5 mm. Arctie Ocean (Hammerfest [Finmark]). 6. M. clypeata (Kreyer) 1842 Leucothoe e., Kreyer in: Naturh. Tidsskr., v.4 p.157 | 1845 L.c., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.545 t.6 f.2a-—f | 1846 L.e., Kroyer in: Voy. Nord., Crust. t.22 f.2a—o | 1862 Montagua e., Bate, Cat. Amphip. Brit. Mus., p.58 t.9 f.4 | 1871 Metopa c., A. Boeck in: Forh. Selsk. Christian., 1870 p- 140 | 1876 M. c. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.451 t.18 £.4; t.19 £.3 | 1887 M.c., H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p.90 t.3 f.3—3b | 1893 M. c., A. Della Valle in:-F. Fl. Neapel, v.20 p. 638 t.59 f. 50, 51. Body somewhat compressed, strong. Side-plate 4 much broader than deep, much larger than 24 and 34 combined. Pleon segment 3, postero-lateral corners subquadrate. Eyes very small, round. Antenna 1 very long, 1° joint long, a little longer than 24, flagellum slender, twice as long as peduncle, 25-jointed. Antenna 2 rather shorter than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum less than half length of peduncle, 12-jointed. Maxilla 1 with large 1-jointed palp. Maxillipeds, inner plates separate (?). Gnathopod 1, 4 joint broadly produced and setose, 5! long, tapering, fringed with long setae on the hind margin, 6% much shorter, linear, little curved, with setae on front and apical part of hind margin, finger rudi- mentary, with a comb of graduated spines. Gnathopod 2 stoutly built, 6! joint very large, longer than the 1°, oblong oval widening distally, palm finely serrate, slightly convex and oblique, defined by a strong tooth. Peraeopod 1 more slender than peraeopod 2, which resembles peraeopod 3. Peraeopod 5, 24 joint shorter and broader, also 4 with the laminar part shorter and broader, but the produced part longer than in peraeopod 4 (according to Kroyer’s text and to the fig. 3b of Hansen, but not according to Kroyer’s fig. and Boeck’s fig. 4n).. Uropod 3 stout, pedunele with some spinules, not quite so long as the 2 subequal joints of the ramus. Telson oval, obtuse at apex, figured by Boeck with 2 pairs of lateral spines. L. 6—8 mm. Arctic Ocean and North-Atlantie (Greenland; Bell Sound [Spitzbergen] ?). 7. M.alderii (Bate) 1857 Montagua a., Bate in: Ann. nat. Hist., ser.2 ov.19 p-137 | 1862 M. a., Bate, Cat. Amphip. Brit. Mus., p.57 t.8 f.6 | 1871 Metopa a., A. Boeck in: Forh. Selsk. Christian., 1870 p.141 | 1892 M. alderi, G. ©. Sars, Crust. Norway, v.1 p.250 t.86 | 1893 M. alderi, A. Della Valle in: F. Fl. Neapel, v.20 p. 638 t.59 f.52 | 1874 Stenothoe alderi, M’Intosh in: Ann. nat. Hist., ser. 4 v. 14 p. 265, Body rather compressed, but back broadly rounded. Head, lateral eorners broadly truncate. Side-plate 4 much larger than 24 and 34 combined. Pleon segment 3, postero-lateral corners quadrate. Eyes large, round oval, dark red. Antenna 1 much shorter than antenna 2, 1° joint as long as 24 and 34 combined, flagellum in O, but not in C, longer than peduncle. Antenna 2 strong, especially in CS, ultimate joint of peduncle almost or quite as long as penultimate and 176 Metopa longer than flagellum. Gmathopod 1 small, 4 joint not much produced, 5th as long and broad as 6%, which is imperfectly subchelate. Gnathopod 2 strong, especially in JS, 4tk joint (as in M. norvegica, M. spectabilis and M. robusta) produced on the inner side in a thin triangular lamella, so as to have a cup-shaped appearance like the 5t", 6th in © oblong oval, palm oblique, armed with 8 teeth beginning at the hinge of the finger and followed by a deeply sinuous part which reaches the defining tooth; 6th in ö much larger, palm with 5 or 6 teeth followed by a deep excavation and a large defining tooth. Peraeopods 3—5, with 4 joint decurrent and rather wide, 24 joint well expanded in peraeopods 4 and 5, in the latter rather widened below. Uropod 3, pedunele with 5 minute spines, nearly as long as ramus, of which the 2 joints are equal. Telson large, oblong oval, broadly rounded at apex. Colour whitish, obliquely banded with reddish patches. L. 7 mm. Arctic Ocean, North-Atlantie, North-Sea and Skagerrak (South- and West-Norway, depth 38—1183 m; Spitzbergen; Murman coast; Iceland; British Isles); Kattegat. 8. M. spectabilis O. Sars 1876 M. clypeata var., A. Boeck, Skand. Arkt. Amphip., %.2 t.18 £.5 | 1876 M. alderi (err.. non Montagua alderii Bate 18571), G. O. Sars in: Arch. Naturv. Kristian., v.2 p. 255 | 1879 M. spectabilis, G. O. Sars in: Arch. Naturv. Kristian., v.4 p.451 | 1885 M. s.. G. OÖ. Sars in: Norske Nordhavs-Exp., v. 6 Crust. I p.185 t.15 f.4a—n | 1892 M.s., G. O. Sars, Crust. Norway, v.1 p.251 t. 87 | 1893 M. s., A. Della Valle in: F. Fl. Neapel, v.20 p. 641 t.59 f. 58. Body rather slender. Head, lateral corners obtusely rounded. The much greater size is the chief distinetion between this species and M. alderii (p. 175) but also, eyes comparatively much smaller; antenna 1 in both JS and 9 much shorter than antenna 2, which have ultimate and penultimate joints of peduncle long and strong and flagellum very short; gnathopod 1, 6" joint rather shorter than 5t"; gnathopod 2, 6" joint in Q with palm more oblique and its sinus deeper, in C very large, the defining tooth much larger, the excavation deeper, the dentate portion of the palm having the hindmost tooth much larger than the others; uropod 3, peduncle as long as ramus, 24 joint of ramus shorter than 1°; telson rather narrower. L. 9 14 mm. Arctic Ocean (Hammerfest [Finmark], depth 94—149 m); North-Atlantie. 9. M. affinis Boeck 1871 M..a., A. Boeck in: Forh. Selsk. Christian., 1870 p. 142 | 1876 M.a., A. Boeck, Skand. Arkt. Amphip., v.2 p.459 t.19 f.2 | 1892 M. a., G. O. Sars, Crust. Norway, ®©.1 p.260 t.91 f.2| 1893 M.a., A. Della Valle in: F. Fl. Neapel, v.20 p. 644. Body in G slender, but not much compressed. Head, lateral corners rounded. Side-plates smaller than usual. Pleon segment 3, postero-lateral corners nearly quadrate. Eyes small, round. Antenna 1 longer than antenna 2, 1% joint longer than 24, flagellum nearly twice as long as peduncle, not very slender. Antenna 2, ultimate and penultimate joints of peduncle subequal, together as long as flagellum. Gnathopod 1, 4% joint broadly produced, setose, Stk rather long, subfusiform, 6 a little shorter, much narrower, nearly linear, finger very short, stout, setose on inner margin. Gmnathopod 2 powerful, 5th joint wide, cup-shaped, 6! very large and broad, subquadrate, though somewhat widening distally, palm nearly transverse, smooth, little curved, defined by a small tooth. Peraeopods 1—5 powerful, 6! joint somewhat eurved, finger strong and ceurved. In peraeopod 5, 2° joint comparatively small, oval quadrangular, 4 strongly dilated, but only little deeurrent. are) Metopa 47 Uropod 3, peduncle short and broad, little longer than one of the subequal joints of the ramus; its one spine is apieal. Telson scarcely twice as long as broad, devoid of spines, apex obtuse. L. 3—4 mm. Aretie Ocean, North-Sea and Christianiafjord (Norway). 10. M. latimana H. J. Hansen 1887 M.1., H. J. Hansen in: Vid. Meddel,, ser. 4 v.9 p.92 | 1893 M.1., A. Della Valle in: F. Fl. Neapel, v.20 p.644 | 1892 M. affinis?, G. ©. Sars, Urust. Norway, v.1 p. 260. Close to M. affınis. Head, lateral corners broadly rounded. Side-plates not very deep. Antenna 1 little shorter than the whole body, peduncle about as long as half flagellum, 1° joint a little longer than 24. Antenna 2 about ?/, length of antenna 1, ultimate joint of peduncle rather longer than penultimate, flagellum 6-jointed. Gnathopod 1 a little shorter and thicker than in M.norvegica, especially as to 6% joint, in which oblique palm oceupies whole breadth of hand. Gnathopod 2 rather short, powerful, 6" joint widening distally, rather longer than broad, palm long, smooth, nearly straight, defined by a small tooth. Peraeopods 1—5 long, the fingers very long; peraeopod 5, 24 joint pretty well expanded, only a little longer than broad. L. 3 mm. Aretie Ocean and North-Atlantie (Greenland). 11. M. norvegica (Lilj.) 1850 Leucotho& n., W. Liljeborg in: Öfv. Ak. Förh., 0.7 p.82 | 1851 L.n., W. Liljeborg in: Vetensk. Ak. Handl., 1850 p.335 t.20 f.4 | 1862 Montagua n., Bate, Cat, Amphip. Brit. Mus., p. 370 ! 1888 Metopa n., T. Stebbing in: Rep. Voy. Challenger, v.29 p.236 | 1856 Montagua pollexianus (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.57 | 1857 M. pollexiana, Bate in: Ann. nat. Hist., ser. 2 0.19 p. 137 | 1869 Probolium pollexianum, A.M. 6 joint Norman in: Rep. Brit. Ass., Meet. 38 p.274 | 1874 Stenothoepollexiana, M’In- tosh in: Ann. nat. Hist., ser.4 v.14 p. 265 | 1875 Metopa p., Ad. Metzger in: Jahresber. Comm. D. Meere, v.2/3 p.299 | 1887 M.p., H.J. Hansen in: Vid. Meddel,, ser. 4 v.9 p-92 t.3 £.5, 5a |'1892 M. p., 6.0. Sars, Crust. Norway, v.1 p.269 t.95 | 1876 M. clypeata (part.), ' A. Boeck, Skand. Arkt. Amphip., v.2 p.454 | 1893 . M. e., M. pollexiana, A. 1g. 44. Della Valle in: F. FM. M. ; M Fig. 46. Gnathopod 2, g. ie Neapel, v.20 p.643, 645, Fig. 45,46. M. er [After G.O.Sars.] 569. __ [After 6. O. Sars.] Body rather compressed, back rounded. Head, lateral corners broadly rounded. Side-plate 4 fully as large as 24 and 34 combined. Pleon segment 3, postero-lateral corners rather acute than quadrate. Eyes round, dark red. Antenna 1 longer than antenna 2, 1° joint longer than 24 and 34 combined, flagellum slender, twice as long as peduncle, 24-jointed. Antenna 2, ultimate Fig. 45. Gnathopod 1. ah gih 6 joint . and penultimate joints of peduncle subequal, flagellum scarce half length of peduncle. Maxillipeds (Fig. 44), inner plates cleft only at apex, nearly as long as the next joint, which displays no outer plate. Gnathopod 1 (Fig. 45), 4% joint broadly round at produced setose apex, 5th long, densely setose, nearly twice as long as the 6%, which is narrow but has a distinet nearly transverse palm. Das Tierreich. 21. Lief.: T. BR. R. Stebbing, Amphipoda I. 12 178 Metopa Gnathopod 2 (see Lilljeborg’s figure) very large, especially ind (Fig.46), 4" and 5th joints cup-shaped asin M. alderüi (p. 175), 6% long, gradually widening distally, palm angularly produced in the middle, minutely erenulate thence to the hinge, this part separated by a deep narrow incision from a defining tooth which extends beyond the rest of the joint and beyond the finger when elosed. Peraeopod 1 more slender than peraeopod 2, but with the ga joint rather broad aud laminar. Peraeopods 2—5, finger strong, minutely serrulate within, 4% joint produced, especially in peraeopod 5, 24 joint oval, not very long, in 'peracopods 4 and 5. Uropod 3, peduncle with 1 spine on nodiform projeetion of apex, 1° joint of ramus longer than 24, nearly as long as pedunele. Telson triangular oval, tapering to a narrow apex, 2 pairs of lateral spinules. Colour whitish- yellowish, with narrow orange band to each segment; ova bright bluish. L. Q 8 mm, J rather larger. Aretie Ocean, North-Atlantie and North-Sea (Norway, depth 55—94 m; Greenland; Murman coast; British Isles). 12. M. boeckii 0. Sars 1868 Montagua norvegica (err., non Leucothoe n. Liljeborg 1850!), Bate & Westwood, Brit. sess. Crust., v.2 p.500 f. | 1871 Metopa bruzelii (err., non Montagua b. Goes 1866!), A. Boeck in: Forh. Selsk. Christian., 1870 p.142 | 1876 M.b., A. Boeck, Skand. Arkt. Amphip., v.2 p.458 t.18 f.29 | 1882 M. borealis (part.), G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.91 t.4 f.4a | 1892 M. boecki, G.O. Sars, Crust. Norway, v.1 p. 252 t. 88. Body slender and compressed. Head, lateral corners angular. Side-plate 4 larger than 2 and 34 combined. Pleon segment 3, postero-lateral eorners rather acute. Eyes round, dark red. Antenna i in Q rather longer than antenna 2, scarcely so in d, 1° joint not so long as 24, flagellum slender, longer than pe- duncle. Antenna 2, ultimate and penultimate joints of pedunele subequal, stronger in J than in Q, with flagellum shorter. Gmnathopod 1 feeble, 4 joint not broadly produced, 5tk setose, little longer than the fusiform 6%. Gmathopod 2 rather powerful, 4 joint not cup-shaped, 6% in 9 triangular oval, palm somewhat oblique, near the hinge of finger scarcely dentate, in the other half minutely, being then defined by a strong tooth and 2 spines; in the J larger, having the minute dentation replaced by a deep and rather wide excavation bounded by a sharp tooth. Peraeopods 1—5 rather slender, 4" joint not greatly expanded or much decurrent even in peraeopods 4 and 5, which have the 24 joint _ oblong oval. Uropod 3 rather slender, peduncle with 4 spines, subequal to ramus, in which 1° joint is longer than the 24. Telson oblong oval, distally tapering to acute apex, 3 pairs of lateral spines. Colour whitish with scattered red-brown patches; ova bluish. L. 6 mm. Arctic Ocean, North-Atlantie and North-Sea (Norway). 13. M. leptocarpa O. Sars 1882 M.l., G. O.Sars in: Forh. Selsk. Christian., nr.18 p.91 t.4 f.3,3a | 1892 M.l., G.O. Sars, Crust. Norway, v.1 p.265 1.93 £.2| 1893 M.!., A. Della Valle in: F. Fl. Neapel, v.20 p.639 t.59 f. 53. Body very slender, not much compressed. Head, lateral eorners angular. Side-plate 4 scarcely larger than 24 and 39 combined. Pleon segment 3, postero- lateral corners little produced, rather obtuse. Eyes round. Antennae 1 and 2 subequal, rather short. Antenna 1, 1° joint scarcely aslong as 24 and 3 combined, flagellum shorter than peduncle, 9-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum about half length of pedunele. Gnathopod 1 slender, longer than gnathopod 2, 5th joint extremely narrow and elongated, 6!h much shorter, narrowly oblong but widening distally, the small palm nearly transverse, defined by a small tooth. Gnathopod 2 powerful, 6% joint broadly BEN! 179 Metopa ‘oval, palm smooth, convex, rather oblique, defined by a sharp tooth. Peraeo- pods 1 and 2 little unequal, peraeopods 3—5, 4" joint not greatly expanded, in peraeopod 5 produced below middle of 5tk, 24 joint of peraeopod 5 oblong oval. Uropod 3, peduncle with 2 spinules, longer than 1° joint of ramus, 24 as long as 1°. Telson unarmed, rather broadly oval, apex obtuse. 1.04 mm. North-Atlantie (Christiansund [West-Norway]). Depth 110—-146 m. 14. M. longicornis Boeck 1871 M.1l., A. Boeck in: Forh. Selsk. Christian., 1870 p.143 | 1876 M.1,, A. Boeck, Skand. Arkt. Amphip., ©.2 p.460 t.19 f.1 | 1887 M.|., H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p.97 t.4 f.1,1a|1892 M.|., G.0O. Sars, Crust. Norway, v.1 p.258 t.90 f.2 |, 1893 M.L., A. Della Valle in: F. Fl. Neapel, - ©.20 p. 644. Body slender. Head, lateral eorners bluntly produced. Sär-elite 4 as deep as broad, rather larger than 24 and 32 combined. Pleon segment 3, postero- lateral corners produced but not very acutely. Eyes round, rather large. Antennae 1 and 2 subequal, rather long. Antenna 1, 1° and 24 joints long, sub- equal, flagellum scarcely longer than peduncle, with 10 joints (20, Sars in text). Antenna 2, ultimate joint of peduncle as long as flagellum, rather shorter than penultimate. Gnathopod 1, 6'% joint as long as 5'%, subfusiform, with a row of seven minute spinules on what may be considered the palmar part of the hind margin. Gnathopod 2 comparatively feeble, scarcely longer than gnathopod 1, 6% joint oblong triangular, palm oblique, smooth, defined by a small tooth. Peraeopods 1—5 rather slender, 4% joint little decurrent, sublinear; 24 rather narrowly oval in peraeopod 4, more broadly so. in peraeopod 5, with hind margin rather abruptly curved in the middle. Uropod 3, peduncle with 3 spines, nearly as long as ramus, the joints of which are subequal. Telson with 3 pairs of lateral spines, narrowly oval, blunt at apex. 1.0 4 mm. Aretie Ocean, North-Atlantie and Christianiafjord (Norway; Greenland, depth 56— 112 m). 15. M. pusilla O.Sars 1892 M.p., G. ©. Sars, Crust. Norway, v.1 p.256 t.90 f.1. Body short, eompressed. Head, lateral corners sharply angular. Side-plates very large, 4! nearly as deep as broad, rather larger than 24 and 3% combined. Pleon small. Pleon segment 3, postero-lateral corners little produced but acute. Eyes minute, round, dark red. Antennäe 1 and 2 rather slender and tolerably long, though shorter than in M. longicornis. Antenna 1, 24 joint scarcely shorter than 1°, flagellum longer than peduncle, 11-jointed. Antenna 2 scarcely shorter than antenna 1, ultimate and penultimate joints of pedunele subequal, slender, flagellum shorter than the 2 together, 9-jointed. Gnathopod 1 rather feeble, 6!" joint decidediy shorter than 5%, sublinear. Gnathopod 2 moderately strong, 6!" joint oblong triangular, widening distally, palm somewhat “oblique, nearly straight, slightly serrated, defined Dy an acute tooth; in C rather longer than in O0. Peraeopod 1 rather slender and elongated, the others stouter, 3—5 successively shorter, the finger strong and curved. Peraeopod 5, 24 joint rather a short broad oval, 4 produced beyond middle of 5tk, Uropod 3, peduncle with 2 spines, scarcely longer than 1° joint of ramus, and subequal to the 24. Telson with 2 pairs of lateral spines, oblong oval. Colour whitish with stellate brownish REDE patches, side-plates also tending to greenish. L. Q 3 mm. North-Atlantie, North-Sea and Skagerrak (West- and South-Norway). In shallow water among Algae and Hydroids. 12* a a ee 180 Metopa 16. M. aequicornis U. Sars 1879 M. aegvicornis, G. O. Sars in: Arch. Naturyv. Kristian., e.4 p.453 | 1885 M.a., G.O.Sars in: Norske Nordhavs-Exp., ©.6 Crust. I p. 188 t.15 f.5 | 1895 M. aeqwicornis, A. Della Valle in: F. Fl. Neapel, v.20 p. 644. Body rather stout, back round. Head, lateral corners little projeeting. Side- plate 4 elliptic, broader than deep, larger than 24 and 34 combined, concealing 5th and 6%, Pleon segment 3, postero-lateral corners slightly produced but obtuse. Eyes small, round, red. Antennae I and 2 nearly as long as the body, subequal. Antenna 1, 1° joint a little shorter than 24, flagellum slender, a little longer than peduncle, with many joints. Antenna 2, ultimate joint of peduncle longer than penultimate and as long as flagellum. Gnathopod 1 as in M. spectabilis (p.176). Gnathopod 2, 6!" joint very large, distally dilated, palm somewhat oblique, almost straight, eoarsely dentate throughout, and defined by a short triangular projection. Peraeopods 1—5, uropods 1—3 and telson resembling those of M. spectabilis. Colour whitish, pellueid, with some very faint pigmentation. L. 75 mm. Arctie Ocean (South-West of Spitzbergen). Depth 1400 m. 17. M. borealis O.Sars 1882 M.b. (part.), @. O. Sars in: Forh. Selsk. Christian., nr. 18 p.91 t.4 f.4 | 1887 M.b.?, H.J. Hansen in: Vid. Meddel., ser.4 v.9 p.91 t.3 f.4,4a | 1892 M.b., G. O. Sars, Crust. Norway, v.1 p.254 t.89 f.1 | 1893 M.b., A. ah Valle in: F. Fl. Neapel, v.20 p. 644. Body rather stout. Head, lateral cornersrounded. Side-plates large,4{ much larger than 2dand 39 combined. Pleon segment 3, postero-lateral corners acutely produced. Eyes round, dark red. Antennae 1 and 2 short, antenna 1 slightly shorter than antenna 2, 1° joint as long as 24 and 34 combined, flagellum longer than peduncle, 12-jointed. Antenna 2, ultimate joint of peduncle rather longer than penultimate, and equal to flagellum. Gnathopod 1 small, 6% joint about as long as 5%, narrowly oval, with no distinet palm. Gnathopod 2, 6!" joint oblong, slightly expanded distally, palm slightly oblique, little curved, coarsely and irregularly dentieulate throughout, defined by a tooth. Peraeo- pods 2—5 stout; in peraeopod 4, 24 joint broadiy oval, 4! broad and decurrent almost to end of 5!%. Uropod 3, peduncle with 2 spinules, much shorter than ramus, of which 24 joint is shorter than 1°. Telson without spines, oblong oval, apex obtuse. L. 9 5—7 mm. Arctie Ocean and North-Atlantie (Norway, Greenland). 18. M. rubrovittata O. Sars ?1869 Probolium alderi (err., non Montagua alderii Bate 1857!), A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.273 | 1882 Metopa rubrovittata, G. ©. Sars in: Forh. Selsk. Christian., nr. 18 p.90 t.4 f.2,2a | 1889 M.r., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 «2 p.188 t.7 f.4,4°| 1892 M.r.,, @.0. Sars, Crust. Norway, v.1 p. 255 t. 89 f 2|1893 M.r., A. Della Valle in: F. Fl. Neapel, v.20 p. 645. Body stout and compact. Head, lateral corners a Side-plate 4 much broader than deep, nearly twice as large as 2 and 3X combined. Pleon segment 3, postero-lateral corners produced but obtuse at apex. Eyes rather small, round, dark red. Antenna 1 short, a little longer than antenna 2, 1° joint rather longer than 22 and 34 combined, flagellum longer than peduncele, 10-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum longer than both combined. Gnathopod 1, 6% joint narrower than 5%, subequal to it in length, palm imperfectly defined by a spine about in the middle of the hind margin. Gnathopod 2 rather powerful, 6% joint oblong quadrangular, but widening a little distally, palm nearly transverse, convex, regularly serrate, Metopa 181 defined by a strong acute tooth. Peraeopods 2—5 moderately stout, expansion of 24 joint in peraeopod 5 oblong oval, and the 4% produced nearly to end of 5%. Uropod 3, peduncle with one spine, not longer than 1° joint of ramus, which is equal to 24, Telson ‚without spines, more than twice as long as broad, oval, apex obtuse. Colour whitish with bands of erimson, which on the side-plates are oblique and undulating; ova bluish. L. 25—4 mm. Aretie Oeean, North-Atlantie and North-Sea (Christiansund, depth 56 m, and Vadsö [Norway]; Holland; France; Firth of Clyde; Liverpool Bay); Kattegat. 19. M. sölsbergi J. S. Schn. 1884 M. s., J. S. Schneider in: Tromse Mus. Aarsh., ©.7 p.71 t.8,4 | 1892 M.s., G. O. Sars, Crust. Norway, v.1 p. 266 t. 94 f.1| 1893 M. s., A. Della V alle in: F. Fl. Neapel, v.20 p. 645. Body robust, little compressed, integument unusually soft and thin. Head, lateral corners rounded. Side-plate 4 as deep as broad, rather larger than ' 24 and 34 combined. Pleon segment 3, postero-lateral corners subquadrate. Eyes round, yellowish red. Antenna 1 rather shorter than antenna 2, 1° joint as long as 24 and 32 combined, flagellum much longer than pedunele, 14-jointed. Antenna 2, ultimate joint of pedunele equal to penultimate (Sars) or longer than it (Schneider), flagellum half length of peduncle, 10-jointed. Maxilla 1, palp 1-jointed. Maxillipeds with inner plates apparently separate (see Schneider 1.3 f. 6). Gnathopod 1 rather strong, 4 joint rectangular, little produced, 5'% and 6'h subequal, 6% oblong oval, with 2 spinules on the hind margin, but no definite palm. Gnathopod 2 strong, 6!" joint oblong quadrangular, but slightly expanded distally, palm smooth, slightly oblique, forming an obtuse angle with the hind margin, defined by 2 spinules, and (according to Schneider, but not Sars) by a small process. Peraeopod 1 not quite so stout as peraeopods 2 and 3. Peraeopods 4 and 5, 24 joint oblong oval, unusually narrow, 4!" moderately expanded, and deeurrent to middle of 5th. Uropod 3, peduncle with 4 spinules, nearly as long as ramus, of which the 2 joints are equal. Telson unarmed, oval, obtuse at apex. Colour pale carneous or yellowish. L. 9 nearly 6 mm. Hardangerfjord and Malangenfjord [Norway]. Depth 18 m. 20. M. tenuimana 0. Sars 1892 M.t., G. O. Sars, Crust. Norway. ©.l p.259 1,91 f.1. ' Body slender. Head, lateral corners angular. Side-plate 4 broader than deep, much larger than 2 and 3% combined. Pleon segment 3, postero-lateral corners much produced. Eyes round. Antennae 1 and 2 rather short. Antenna 1 rather the longer, 1° joint much longer than 24, flagellum longer than peduncle, 9-jointed. Antenna 2, ultimate and penultimate joints of peduncle sub- equal, together as long as flagellum. Gnathopod 1, 6!" joint rather shorter than 5tk, tapering, without any armature to indicate a palm. Gnathopod 2 rather feeble, 6!" joint slenderly oblong triangular, widening distally, palm quite smooth, slightly oblique, defined by a tooth and spines. Peraeopods 1—5 nearly as in M. pusilla (p. 179), but rather less stout, though with 24 and 4 joints of peraeopod 5 more strongly developed. Uropod 3, peduncle with only an apical spinule, not longer than 1° joint of ramus, which has the 24 joint shorter than 1%. Telson with 1.or 2 pairs of lateral spines, oval, obtuse at apex. L. © 3 mm. North-Atlantie (West-Norway). 182 Metopa, Metopella 21. M.invalida O.Sars 1876 M. alderii (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.456 1.17 f.4,4k | 1892 M. invalida, G.O. Sars, ‚Crust. Norway, v.1 p. 267 t. 94 f.2. Body stout and compact. Head, lateral corners obtusely projecting. Side- plate 4 broader than deep, much larger than 24 and 34 combined. Pleon segment 3, lateral corners rather produced. Eyes round, bright red. Antennae 1 and 2 subequal, short. Antenna 1, 1° joint shorter than 24 and 3% combined, flagellum scarcely as long as pedunele, 9-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, flagellum scarcely longer than ultimate. Gnathopod 1, 6'h joint as long as 5", narrow, tapering, with a single spine about in middle of hind margin. Gnathopod 2 rather feeble, 5tk joint widely eup-like, setose at rather produced apex, 6% oblong quadrangular, slightly dilated distally, palm nearly straight, quite smooth, slightly oblique, forming obtuse angle with hind margin. Peraeopods 1—5 rather slender, but 24 joint of peraeo- pod 5 rather broad, oval quadrangular, and 4" joint produced beyond middle of 5, Uropod 3, peduncle with 2 spinules, shorter than ramus, of which the joints are subequal. Telson unarmed, 3 times as long as broad, a little constrieted above, apex obtusely pointed. Colour pale greyish white, with transverse yellowish bands; ova bluish. L. © 4 mm. Aretie Ocean (Hammerfest and Selsövig [North-Norway]). Depth 74—92 m. 2. Gen. Metopella 0. Sars 1871 Metopa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.140 | 1892 Metopella, G. O. Sars, Urust. Norway, v.1 p.274 | 1893 Proboloides (part.) + Metopoides (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907. Antennae 1 and 2 not very long nor very unequal, with or without accessory fagellum to-antenna 1. Mandibular palp, 3% joint small. Maxilla 1, palp (at least sometimes) 2-jointed. Maxillipeds, inner plates not very small, separate (at least sometimes), outer plates very small (mouth-organs ascertained for M. nasuta and M. nasutigenes). Gnathopod 1 simple or subchelate. Gnathopod 2 subchelate. Peraeopods 3—5, 24 joint little or not at all expanded. Uropod 3, pedunele shorter than ramus. 6 species. Synopsis of species: 1 { Antenna 1, 1st joint strongly produced over 24. — 2. Antenna 1, 1st joint not produced — 3. j Peraeon segment 4 conspieuously carinate . ... . 1. M.nasuta .. . p.182 Peraeon segment 4 not conspieuously carinate . . 2. M. nasutigenes . p. 183 8 pP y I 3 f Peraeopod 5, 24 joint without expansion. . .. . 3. M.ovata. . . . p.183 \ Peraeopod 5, 2d joint not without expansion — 4. | Peraeopod 5, 2d joint with convex expansion above 4. M.neglecta . . p.184 \ Peraeopod 5, 2d joint with slight linear expansion —5. p J 8 P J Peraeon segment 4 carinate. .. -... 2... 5. M. carinata .. . p.184 \ Peraeon segment 4 not earinate. . ». 2... 6. M. longimana . p.185 1. M. nasuta (Boeck) ‘1871 Metopa n., A. Boeck in: Forh. Selsk. Christian., 1870 p.144 | 1876 M.n., A. Boeck, Skand. Arkt. Amphip.. v.2 p.465 t.18 f,6 | 1887 M. n.?, H. J. Hansen in: Vid. Meddel., ser. 4 vo.9 p.102 | 1893 M. n. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.637 | 1892 M.n., Metopella (part.), G. O. Sars, Crust. Norway, v.1 p.276 t.98 £.1. Body short, compact and firm. Peraeon segment 4 much the largest, with rounded dorsal carina. Head, lateral corners truncate.. Side-plate 2 Metopella 183 with dentiele at lower hind corner, 4!" much larger than 24 and 32 combined. Pleon segment 3, postero-lateral angles subacute, segment 4 carinate, overarching segment 5. Eyes small, round. Antenna 1, 1° joint completely overlapping 24, flagellum 8-jointed. Antenna 2 rather shorter than antenna 1, ultimate and penulti- mate joints of peduncle subequal, flagellum 7-jointed. Maxilla 1, palp 2-jointed. Maxillipeds, inner plates separate. Gnathopod 1 feeble, 4% joint shorter than 5th, 6! joint as long as 5t", almost linear. Gnathopod 2 of moderate size, 5th joint cup-like, 6!" oblong triangular, widening distally, palm a little oblique, eoarsely serrate, defined by a tooth and 2 spines. Peraeopods 1—5 very slender, none of the joints expanded. Uropod 3, peduncle armed with 1 spine, 2 joints of ramus subequal. Telson narrow, linguiform, obtuse at apex, quite unarmed (Sars) or with 2 lateral spines. L. © 3—4 mm. Arctie Ocean, North-Atlantie and North-Sea (Norway, depth 94—188 m; ?Greenland, depth 72m; Firth of Clyde; Firth of Forth; Moray Firth). 2. M.nasutigenes (Stebb.) 1888 Metopa n., T.Stebbing in: Rep. Voy. Challenger v.29 p.753 t.40 | 1893 M. nasuta (part.), Proboloides nasutigenes, A. Della Valle in: F. Fl. Neapel, v.20 p. 637, 907, 945. Body compaet and firm. Peraeon segment 4 much the largest, slightly angled dorsally, not carinate. Head, lateral corners little produced. Side- plate 2 with serration of 4 points at bottom of hind margin, 4!" much larger than 24 and 3% combined. Pleon segment 3 almost quadrate, segment 4 with slight dorsal depression. Eyes round, not large. Antenna 1, 1° joint acutely produced beyond 24, 24 longer than 34, flagellum 10-jointed. Antenna 2 rather shorter than antenna 1, ultimate joint of peduncle rather longer than penultimate, flagellum 8-jointed. Maxilla 1, palp 2-jointed. Maxillipeds, inner plates separate. Gmnathopod 1, 4! joint as long as 5t, 5tk much shorter than 6*%, almost eup-like, 6!" almost oblong, subchelate, with oblique, finely peetinate palm, defined by an obtuse angle and spines. Gmnathopod 2 not very unlike gnathopod 1, but larger, 4!" joint shorter than the cup-like 5t, 6'h 3 times as long as broad, almost parallel-sided, palm almost smooth, defined as in gnathopod 1. Peraeopods 1—5 very slender, none of the joints expanded. Uropod 3, peduncle armed with 1 spine, 1 joint of ramus armed with 3 spines, rather longer than 24 joint. Telson long, with upturned sides, apex acute. L. © 45 mm. Cumberland Bay [Kerguelen Island], Depth 222 m. 3. M. ovata (Stebb.) 1888 Metopa o., T.Stebbing in: Rep. Voy. Challenger, v.29 - P-764 t.44 | 1895 M. o., Metopoides ovatus, A. Della Valle in: F. Fl. Neapel, v.20 p. 645, 907, 988. Head, lateral corners little produced. Pleon segment 3, postero- lateral corners sub- quadrate. Side-plate 2 completely covering the 15, 4! much larger than 24 and 34 combined, Fig.47. M. ovata. Lateral view, 2. lete] änzEth Fig. 48. M. ovata. compietely Covermg9””, Peraeopod 2. 6 and 7th (Fig. 47). Eyes round. Antenna 1, flagellum longer than peduncle, 10-jointed; a rudi- mentary 2-jointed accessory flagellum, as in Metopoides (p. 185). Antenna 2 Re Er 184 Metopella nearly as long as antenna 1, ultimate and penultimate joints of pedunele subequal, flagellum longer than pedunele, 10- or 11-jointed. Maxilla 1, palp 2-jointed. Maxillipeds, inner plates separate. Gnathopod 1 subchelate, 4!" joint produced along the short cup-like 5t", 6!" much longer than 4" or 5t", almost oblong, palm convex, not very oblique, very minutely pectinate, defined by a denticle and 2 spines. Gnathopod 2 very similar to gnathopod 1, but larger, 6% joint longer, a little widened distally, palm smooth, convex, scarcely oblique. Peraeopods 1-—5 (Fig. 48) slender, all joints linear, but 24 joint in peraeopods 3 and 4 (not in 5) a little wider above than below. Uropod 3, peduncle scarcely longer than 1° joint of ramus, 24 of ramus rather shorter than 1°. Telson not twice as long as broad, apex narrow. L. about 3 mm. Strait of Magellan (Cape Virgins). Depth 100 m. 4. M. neglecta (H. J. Hansen) 1876 Metopa longimana (part.), A. Boeck, Skand. Arkt. Amphip., ©.2 t.17 f£.5—5n | 1887 M. neglecta, H. J. Hansen in: Vid. Meddel., ser.4 0.9 p.96 t.3 f.9—9b | 1893 M. n., A. Della Valle in: F. Fl. Neapel, v.20 p.640 1.59 f.56 | 1892 M.n., Metopella (part.), G. O. Sars, Crust. Norway, v.l p. 274 t. 97 £.2. ve Body rather compressed, integument thin. Head, lateral corners sub- quadrate. Side-plate 4 larger than 24 and 3% combined. Pleon segment 3, postero- lateral angles somewhat produced. Eyes small, round. Antenna 1, flagellum scarcely as long as peduncle, about 8-jointed. Antenna 2 in Q subequal to antenna 1, in J rather longer, ultimate joint of peduncle shorter than penultimate, flagellum subequal to the latter. Maxilla 1, palp very long, 1-jointed (Boeck perhaps overlooked the division into 2 joints). Maxillipeds, inner plates separate (Boeck’s figure). Gnathopod 1, 4!" joint not much produced, 6! almost linear, not much shorter than 5t". Gnathopod 2, 5t" joint narrowly cup-like, 6'h Jong and narrow, widening distally, palm rather oblique, curved, smooth, defined by a denticle and 2 spines. Peraeopods 1—5 extremely slender, only 24 joint in last pair at all expanded, and that only in the upper part. Uropod 3, peduncle armed with 2 spinules, joints of ramus subequal. Telson long and narrow, apex obtuse, 2 pairs of lateral spines. L. © 3 mm. Arctic Ocean, North-Atlantie and North-Sea (West-Norway; Greenland, depth | 19—113 m). 5. M. carinata (H. J. Hansen) 1887 Metopa c., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.99 t.4 f.3-—3e | 1895 M. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 637 t. 59 f. 49. Body deep, little compressed in Q, more so in d. Peraeon segment 4 much the largest, with rounded dorsal carina, more elevated in O than in C. Side-plate 2 with subacute apex, 4 much larger than 24 and 34 combined. Eyes small, round. Antennae 1 and 2 subequal, very short and slenderin © ‚ thicker and longer ind. Antenna 2, ultimate and penultimate joints of pedunele subequal. Gnathopod 1 feeble, 6! joint twice as long as 5t", more slender, tapering. Gnathopod 2, 6% joint in Q large, widening distally, palm curved, a little oblique, defined by a long narrow projecting process; 6 joint in G longer and narrower, not dilated, palm very oblique, defined by a minute tubercle. Peraeopods 1—5, all joints slender, 24 in peraeopod 5 with slight linear expansion. L. © 3, C 2'1 mm. Arctic Ocean and North-Atlantie (Greenland). Depth 4—94 m. Metopella, Metopoides 185- m 6. M.longimana (Boeck) 1871 Metopal., A. Boeck in: Forh. Selsk. Christian., 1870 p. 144 | 1876 M. I. (part.), A. Boeck, Skand. Arkt. Amphip., v. 2 p. 464 t.17 £.6 | 1887 M.1., H.J. Hansen in: Vid. Meddel., ser.4 v.9 p.95 t.3 f:8—8b | 1893 M.1., A. Della Valle in: F. Fl. Neapel, v.20 p.643 t.59 f£.61 | 1892 M.., Metopella (part.), G. O. Sars, Crust. Norway, o.1 p. 273 t. 97 £.1. Body strongly built, integument firm. Head, lateral angles acute. Side- - plate 4 unusually large, completely covering 5tt, 6! and 7%, Pleon segment 3 - slightly produced, subquadrate. Eyes round. Antennae 1 and 2 subequal in ©, antenna 1 the shorter in d. Antenna 1, flagellum 8-jointed. Antenna 2,.. ultimate joint of pedunele much shorter than penultimate. Gnathopod 1, 4 joint _ moderately produced, 6! decidedly shorter than 5t", almost linear. Gnathopod 2, 6% joint in © nearly as in M. neglecta, but palm almost straight, slightly serrate,. defined by a decided tooth; in J larger, with 2 excavations in the palm near the tooth. Peraeopods 1—5 slender, throughout, only 24 joint of 5th - with slight linear widening. Uropod 3, pedunele with 2 spines, joints of ramus- - subequal. Telson oblong oval, obtuse at apex, with 2 pairs of lateral spines.. L. about 3 mm. E; Aretic Ocean and North-Atlantie (Greenland); North-Sea (Norway) and Christiania- - $jord. Depth 72—-110 m. 3. Gen. Metopoides Della Valle 1893 Metopoides (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907. Antenna 1 shorter than antenna 2, with very small 2-jointed accessory flagellum. Mandibular palp, 34 joint small, with 2 apical setae. Maxilla 1, palp large, 2-jointed. Maxillipeds (Fig. 49), inner plates not very small,. - doubtfully separate, outer plates very small but apparent. Gmathopods 1 and 2 - (Fig.50) subchelate. Peraeopods 4 and 5, 2% joint expanded. Uropod 3, peduncle- shorter than ramus. 3 species. ALT: a rn Ba a a a a a une Synopsis of species: Er. Peraeopods 3—5, 4th joint narrow . .. . . .- 1. M. magellanieus. . p.185 E- N Peraeopods 3—5, 4th joint not narrow — 2. Sf Gnathopod 2, 6th joint elongate . .. .... 2. M. parallelocheir . p.186 | Gnathopod- 2, 6th joint short . ....... 3. M. compaectus. . . p. 186: 1. M. magellanieus (Stebb.) 1888 Metopa magellanica, T. Stebbing in: Rep. Voy. Challenger, v.29 p.756 t.41 | 1893 M. m., Metopoides magellanicus, A. Della Valle in: F. Fl. Neapel, ©.20 p. 644, 907, 938. Head, lateral angles little produced, obtuse. Side-plate 3 a little narrowed downward, 4! of equal breadth and depth, larger than 24 and 3% combined. Pleon segment 3, postero-lateral corners subquadrate. Eyes round. Antenna 1, 34 joint longer than half 24, flagellum longer than peduncle, 13-jointed. Antenna 2, penultimate joint of peduncle long and slender, rather shorter than ultimate, flagellum 8- or 9-joimted. Maxillipeds, inner plates probably not separate except at apex, outer plates consisting of small apical processes on joints of considerable length and width. Gmathopod 1, 5t% joint rather shorter than the oval 6%, palm very oblique, finely pectinate, defined by 2 spines, to which the long finger reaches. Gnathopod 2, 5th joint much - shorter than 6t%, cup-like, 6!" widest where the long oblique palm with ‚elose row of spines meets the much shorter hind margin; finger long, curved. Marsupial plates almost eircular. Peraeopods 1—5, 4! joint long, scarcely \ 186 | Metopoides decurrent, 24 joint more expanded in peraeopod 5 than in 4. TUropod 3, 24 joint of ramus shorter than 1%. Telson twice as long as broad, distally tapering to acute apex, 3 spines on each margin. L. O0 5 mm. Strait of Magellan (Cape Virgins). Depth 100 m. 2. M. parallelocheir (Stebb.) 1888 Metopa p., T. Stebbing in: Rep. Voy. ‘Challenger, v.29 p.762 t.43 | 1893 M.p., Metopoides p., A. Della Valle in: F. Fl. Neapel, 2.20 p. 642, 907, 938; t. 59 f. 59. Head, lateral corners little produced. Side-plate 3 of uniform breadth. Pleon segment 3, postero-lateral corners quadrate. Eyes round. Antenna 1, 34 joint half length of 24, flagellum shorter than peduncle, about 8-jointed. Antenna 2 as in preceding species. Maxillipeds, inner plates not very large, probably not separate except at apex, outer plates triangular, on joints which are broad but not elongate. Gmathopod 1, 6!" joint rather long and narrow, palm almost smooth, extremely oblique and ill-defined except by ending of spine-row, finger finely pectinate, a dentiele at base of the nail. Gnathopod 2, 5t% joint cup-like, much shorter than the long hand, which has front and hind margins almost parallel, palm short but oblique, defined by a tooth and group of spines, finger short, curved. Peraeopods 1—5, 4b joint rather long, wider and more decurrent in peraeopods 3-and 4 than in 1 and 2. Uropod 3, 2% joint of ramus a little shorter than 1%. Telson long oval, apex not very acute, 2 spines on each margin. L. 3:5 mm. Strait of Magellan (Cape Virgins). Depth 100 m. 3. M. compactus (Stebb.) 1888 Metopa compacta, T. Stebbing in: Rep. Voy. Challenger, v.29 p.767 t.45 | 1898 M.c., Metopoides compactus, A. Della Valle in: F. Fl. Neapel, v.20 p. 644, 907, 938. Head, lateral corners a little prominent. Side-plate 2 broad, semi- eircular, 34 oblong, 4" broader than deep. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes round. Antenna 1, 39 joint longer than half 24, flagellum shorter than peduncle, 10-jointed. Antenna 2 little longer than antenna 1, penultimate joint of pedunele rather longer than ultimate, flagellum 8-jointed. Mandibular palp with 24 joint broader and 34 a little more developed than usual in this family. Maxillipeds (Fig. 49), inner plates rather large. sepa- ration doubtful, outer plates apically rounded, the sup- porting joint almostas broad as long. Gnathopod 1, 4 and 5% joints strongly armed with peetinate spines, 5th as long as 6%, which widens to-the convex, rather oblique, . finely pectinate and denti- Fig. 49. eulate palm, forming obtuse 6% 5% joint as sa ge angle with hind margin and ee defined by a row of spines; finger pectinate. Gnathopod 2 (Fig. 50), 5% joint cup-like, rather shorter than the stout oblong 6", palm very little oblique, sinuous, denticulate, defined Ze S a N Ta FEN Na 7 a kn KUBASE, an er Be Er . Metopoides, Proboloides 187 by a small tooth. Marsupial plates almost eireular. Peraeopods 1—5 nearly as in M. parallelocheir. Uropod 2, rami less unequal than in 2 preceding species. Uropod 3, 24 joint of ramus much shorter than 1%. Telson very broad, though longer than broad, distally converging to an obtuse apex; 3 small spines on each margin. L. © 35 mm. Strait of Magellan (Cape Virgins). Depth 100 m. 4. Gen. Proboloides Della Valle 1871 Metopa (part.), A. Boeck in: Forh, Selsk. Christian., 1870 p.140 | 1898 Proboloides (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 907. _ Antennae 1 and 2 subequal. not large; antenna 1 without accessory flagellum or by exception perhaps with rudiment. Mandibie, molar wanting, palp slender, 3-jointed, apical joint small. Maxilla 1, palp large, 2-jointed. Maxillipeds, inner plates separate, usually not very small, outer plates very small or obsolete. Gnathopod 1 more or less subchelate. Gnathopod 2 distinetly subchelate in ©, in C powerful, with palm defined or undefined. - Peraeopods 3—5, 4% joint usually expanded and produced, 2% joint expanded in peraeopods 4 and 5, not or scarcely in peraeopod 3. Br 7 species accepted, 1 doubtful. Synopsis of accepted species: 1 f Peraeopod 3, 4th joint rather narrow . . . . 1. P.grandimanus. .. p. 187 \ Peraeopod 3, 4th joint rather broad — 2. Gnathopod 2 in Z, palm undefined or imperfeetly defined — 8. Gnathopod 2 in 3, palm well defined — 6. 2 [ Peraeopod 3, 2d joint distally widened . . . 2. P. crenatipalmatus . ‚p. 188 Peraeopod 3, 2d joint not widened — 4. ä | Gnathopod 2, palm quite smooth. ... . . 8. #, bruselil „=. ... p. 188 Gnathopod 2, palm not quite smooth — 5. [ Gnathopod 2, palm eonspieuously dentate . .- 4. P. gregarius . . . . p.189 Gnathopod 2, palm ineonspiceuously dentate . 5. P. calearatus . . . . p.189 3» Be I Gnathopod 2, 24 joint broad. ....... 9 Piglaclalie..; 4075 p. 189 =“ Gnathopod 2, 2d joint narrow .-. » »... . 7. P.groenlandiceus . . p.190 1. P.grandimanus (Bonnier) 1896 Probolium grandimanum, J. Bonnier in: Ann. Uuiv. Lyon, v.26 p. 638 t.37 f. 4. fa © unknown. —d. Head without rostrum. Side-plate 1 much more deve- - _ Joped than usually in this family, subtriangular, 24 considerably smaller, _ with acute apex directed forward, 34 and 4! large- Pleon segment 3, postero-lateral corners rounded. Eyes small, round. Antenna 1, 1° and 24 joints long, equal, 34 very short, flagellum with more than 12 joints. Antenna 2, ultimate joint of peduncle rather shorter than the long penultimate, flagellum with more than 10 joints. Epistome very acute. Upper lip bilobed. Mandible small, but these and other mouth-parts in accord with generic character. Maxillipeds, outer plates quite wanting. Gmathopod 1, 4" joint well produced, obtuse at apex, 5!" longer than 6", 6th distally widened, subchelate. Gnatho- - pod 2, 24 joint channelled in front, 4!" joint apieally acute, 5tk short, eup- 4 shaped, 6'h Jarge, elongate, having near the hinge of finger 4 small teeth, only that most remote from hinge acute, the rest of the margin nearly 188 Proboloides straight, fringed with setules, finger as long as 6 joint, with setules om inner margin. Peraeopod 3, 24 joint narrow, 4!" scarcely widened distally. Peraeopods 4 and 5, 24 jointwidely expanded, 4! moderately produced. Uropod 1, rami equal, one with 2, the other with 4 spines. Uropod 2, outer ramus shorter than inner, with 1 spine. Uropod 3, ramus with 2 lateral spines, 24 joint shorter than 1%. Telson with 1 pair of minute and 2 pairs of stout lateral spines. L. less than 5 mm. Bay of Biscay. Depth 950 m. 2. P. cerenatipalmatus (Stebb.) 1888 Metopa crenatipalmata, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.759 t.42 | 1893 M. c., Proboloides erenatipalmatus, A. Della Valle in: F. Fl: Neapel, ».20 p.907, 945. Head, lateral corners very obtuse. Side-plate 4 scarcely equal to 24 and 34 combined. Pleon segment 3, postero-lateral corners subquadrate. Eyes round. Antenna 1, 1° joint not longer than 24, flagellum longer than peduncle, about 12-jointed; perhaps a rudimentary accessory flagellum present. Antenna 2, ultimate joint of pedunele slightly longer than penultimate, flagellum 8-jointed. Mandibular palp with 24 joint long, 34 scarcely longer than 1°, carrying l or 2 apical setae. Gnathopod 1, 4 joint not much produced, apically spinose, 5tR nearly as long as 6!" and rather broader, palm of 6{ oblique, finely cerenulate, finger finely pectinate on inner margin. Gmathopod 2, 5th joint cup-like, 6" oblong oval, palm crenulate in 2 divisions, rather oblique, defined by a sharp tooth, finger broad, smooth on inner margin. Peraeopod 3, 24 joint distally lobed behind, 4" broad, a little decurrent. Peraeo- pods 4 and 5, 2% and 4!" joints expanded, 4 moderately decurrent. Uropod 3, peduncle a little shorter than ramus, with 4 spines; 24 joint of ramus rather longer than 1°. Telson long oval, obtusely pointed, 3 spines on each margin. L. © 6 mm. Strait of Magellan (Cape Virgins). Depth 100--270 m. 3. P. bruzelii (Goes) 1866 Montagua b., Go&s in: Öfv. Ak. Förh., u.22 p. 522 t.38 f. 10 | 1886 Metopa b., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. II p. 484 1887 M.b. (part.), «H. J. Hansen in: Vid. Meddel., ser.4 ©.9 p.97 t.4 f.2e,d | 1892 M.b., G.O, Sars, Crust. Norway, v.1 p. 261 t. 92 £.1. Body slender and rather compressed. Head, lateral corners angular. Side- plate 4 much larger than 24 and 3X combined. Pleon segment 3, postere-lateral angles rather acute than quadrate. Eyes round, dark red. Antennae 1 and 2 sub- equal. Antenna 1, 1° jointlongerthan 24 and 3% combined, flagellum longer than peduncele, about 12-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, and together subequal to flagellum. Maxilla 1 (Go&s) with 2-jointed palp, 1° joint large. Maxillipeds (Goös), inner plates rather small, separate, outer quite obsolete. Gmathopod 1, 4th joint rather broadiy produced, 6% narrower than 5", equal to it in length, tapering distally, smooth. Gmatho- pod 2, 6! joint oval, palm quite smooth, rather oblique, defined by a slight angular projection and 2 spines; alike in G and 9, but larger in C. Peraeopods 2—5 rather stout, 24 joint broadly expanded in peraeopod 5, and 4 produced below- the middle of the 5'". Uropod 3, peduncle nearly as long as ramus, with 4 spines, 24 joint of ramus nearly as long as 1*, Telson long oval, tapering to acute apex, 2 pairs of lateral spines (Sars), 3 pairs and a blunt apex (Go&s). Colour whitish, with a few orange patches; ova bluish. L. 4 mm. Aretie Ocean and North-Atlantie (Spitzbergen, Greenland, Norway). Depth 56—113 m. ‚2 ST a Ay Se EN ee I fi Eee ne 20 ATTEN Proboloides 189 4. P. gregarius (O.Sars) 1882 Metopa gregaria, G. ©. Sars in: Forh. Selsk. m Christian., nr. 18 p.93 t.4 £.6,6a | 1892 Probolium gregarium, G.O.Sars, Crust. Norway, - =@.1p.245 t.84 | 1893 Metopa gregaria, Proboloides gregarius, A. Della Valle in: F. Fl. Neapel, v.20 p. 643, 907, 945; t.59 f. 62, 63. Head, lateral corners nearly rectangular. Side-plate 4 subequal to 24 and 34 combined. Pleon segment 3, postero-lateral angles somewhat produced. Eyes - rounded oval, well developed, dark red. Antenna 1, 1° and 24 joints subequal - in length, flagellum longer than pedunele. Antenna 2, ultimate joint of peduncle rather shorter than penultimate. Lower lip, inner plates coalesced. Mandibular E palp very slight, 34 joint minute. Gnathopod 1, 4 joint considerably produced, 5tt and 6% joints subequal, palm convex, undefined. Gnathopod 2inO, 6b joint oblong oval, palm erenulate in 2 divisions, oblique, defined by a - ‚distinet angle armed with a spinule; in S much larger, much narrower in projeetion to length, the hind margin or palm pubescent, nearly straight, - interrupted by 2 denticles and ending in a finely serrate apical expansion, finger very long, eiliated on inner margin. Peraeopods 3—5, 4 joint broad, - _ decurrent, in the 5tk peraeopod greatly; 24 joint linear in 34, broadly oval - jm 4th, obliquely rounded in 5t. Uropod 3 rather short and stout, peduncle a little longer than ramus, with 6 spines, 24 joint of ramus shorter than 1°. Telson twice as long as broad, apex acute, 4 spines on each margin. Colour whitish, pellueid, with orange patches. L. © 5, S 6 mm. North-Atlantie (Norway). Depth 75—188 m. 5. P. calearatus (O. Sars) 1882 Metopa calcarata, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.92 t.4 f.5,5a | 1892 Probolium calcaratum, G. ©. Sars, Crust. Norway, v.1 p.247 t.85 | 1893 Metopa bruzelüi (part.), M.calcarata, Proboloides calcaratus, A. Della Valle in: F. Fl. Neapel, v.20 p. 641, 907, 945. Head, lateral corners angular in O ‚more rounded in J. Side-plate 4 searcely as broad as 2 and 3% combined. Pleon segment 3, postero-lateral angles rather produced. Eyes very large, oval quadrangular, imperfectly developed, bright red. Antenna 1, 1° joint longer than 24, flagellum little longer than peduncle. Antenna 2, ultimate joint ofpeduncle rathershorter than penultimate. Gnathopod 1 asin P.gregarius. Gnathopod 2in O , 6 jointtriangular oval, palm oblique, nearly straight, slightly serrated, defined by an obtuse angle with 3 spinules, finger of moderate size; in S, 6% joint very long, palm nearly as in P. gregarius, but rather concave and without the 2 denticles, finger long and ciliated. Peraeopods 3—5 more robust than in P. gregarius, the 4" joint more strongly decurrent. Uropod 3, pedunele as long as ramus, 5 spines. Telson comparatively shorter and broader, 3 spines on each margin. Colour uniformly whitish, ova 4 ‚reddish. L.o 5, d 6 mm. North-Atlantie (Norway). Depth 150—282 m. 6. P. glacialis (Kroyer) 1842 Leucothoe g., Kroyer in: Naturh. Tidsskr., v.4 pP 159 | 1846. L.g., Kroyer in: Voy. Nord, Crust. t.22 f.3a—p | 1862 Montagua g., Bate, Cat. Amphip. Brit. Mus., p.58 t.9 £.3 (inaceurate) | 1871 Metopa g., A. Boeck in: Forh. Selsk. Christian., 1870 p.141 | 1887 M.g., H. J. Hansen in: Vid. Meddel,, ser. 4 0.9 p.98 t.3 f.6,6a | 1893 M.g., A. Della Valle in: F. Fl. Neapel, v.20 p.639 t.59 f.54. Side-plate 4 not as broad as 24 and 39 combined. Pleon segment 3, postero- lateral eorners bluntly subquadrate. Eyes small, round, dark. Antenna 1, 1° joint slightly longer than 24, flagellum shorter than pedunele, 10-jointed. Antenna 2 j _ scarcely shorter than antenna 1, ultimate joint ofpeduncle a little shorter than pen- ultimate, longer than 6-jointed flagellum. Maxilla 1, 1° joint of palp unusually 190 Proboloides, Metopidarum species dubia, Cressidae large. Maxillipeds, inner plates distinetly separate and outer altogether wanting. Gnathopod 1 small but rather strong, 5% joint broadiy and stoutly oval, 6% shorter and much narrower, widening distally to a transverse palm, which is slightly overlapped by the finger. Gmathopod 2 large, 24 joint rather short but unusually broad, 6!" longer than 24, oblong, palm defined by a slender outstanding tooth, within which it is erenulate, then forming a denticle and a larger tooth over which the strong finger eurves. Peraeopods 1—5 agreeing with the generie character. Uropod 3, peduncle shorter than the 2-jointed ramus. Telson long oval, without spines. Colour whitish-yellow. L. 7—8 mm. Aretie Ocean and North-Atlantie (Spitzbergen, Greenland, Iceland). 7. P. groenlandicus (H. J. Hansen) 1887 Metopa groenlandica, H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p.94 t.3 f.7—Te | 1893 M.g., A. Della Valle in: F. Fl. Neapel, v.20 p.640 t.59 f. 55. Era Very near to P. glacialis (p. 189), but side-plates deeper, 4! larger than 24 and 34 combined. Antenna 1 in J, 24 joint longer than 1°, a little shorter than flagellum. Mouth-organs not described. Gmathopod 2, 24 joint not unusually wide, 6!% with a deep and broad sinus in the palm between the defining process and a smaller tooth forming a subobtuse angle with the serrate portion near the hinge of the finger. Gnathopod 2 in Q, 6% joint oval, a convex serrate palm sloping to a small tooth. Peraeopod 5, 24 joint much dilated, 4% little L. 9 8'4, © 7'5 mm. Arctic Ocean and North-Atlantie (Greenland). P. sarsii (Pfeff.) 1888 Metopa s., Pfeffer. in: Jahrb. Hamburg. Anst., v.5 p.84 t.2 f.3,8; t.3 f.2 | 1895 M. s., A. Della Valle in: F. Fl. Neapel, 0.20 p. 645. L. 3 mm. South-Atlantie (South Georgia). Low tide. Metopidarum species dubia. Metopa normani Hoek 1889 M.n., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.190 t.7 £.5, 5‘. Said to be near to Metopella longimana (p. 185), but being nearer to Metopoides parallelocheir (p.186). L. 4:8 mm. North-Sea (Dutch coast). Depth 24 m. 10. Fam. Cressidae 1899 Cressidae, T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210. Side-plate 1 rudimentary, 24 to 4 Jarge but normal in shape. Upper lip bilobed. Lower lip with inner lobes coalesced. Mandible, ceutting edge dentate, molar weak, palp elongate, 34 joint long. Maxilla 1, palp 1-jointed. Maxilla 2, inner plate very small. Maxillipeds, inner plates separate, outer small but distinet. Gnathopod 1 simple. Gnathopod .2 subchelate. Peraeo- pods 3—5, 24 joint expanded. Uropods 1 and 2, rami very unequal. Uropod 3 with a single 2-jointed ramus. Telson coalesced with pleon segment 6. Marine. l genus, 3 species. 191 1. Gen. Cressa Boeck e 1857 Danaia (Sp. un.: D. dubia) (non H. Milne Edwards & Haime 1855, Anthozoa!), Bate in: Ann. nat. Hist., ser.2 v.19 p.137 | 1871 Cressa, A. Boeck in: Forh. Selsk. - Christian., 1870 p.145 | 1890 C., J. Bonnier in: Bull. sei. France Belgique, v.22 p.186, 191 | 1892 C., G. O. Sars, Crust. Norway, v.1 p.277 | 1893 C., A. DellaValle in: F. Fl, Neapel, v.20 p.580. * Antenna 1 much longer than antenna 2. Gmathopod 1 slender and feeble. Peraeopods 1—5 slender. Telson acute at apex. 3 species. Synopsis of species: FE 1 Some of the segments dorsally dentate .. . .. . 1. C.dubia „ . . p.19t Be None of the segments dorsally dentate — 2. E 9 EN SE RE Pr RN 2. C.minuta .. p.192 3 ran Wann: a en es ga a e 3. C. abyssicola , p. 192 1. C. dubia (Bate) 1856 Montagua dubius (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.57 | 1857 Danaia dubia, Bate in: Ann. nat. Hist., ser.2 v.19 p. 137 | 1876 D.d., T. Stebbing in: Ann. nat. Hist., ser.4 v.18 p.444 t.19 f.2 | 1888 Cressa d., #8 T.Stebbing in: Rep. Voy. Challenger, v.29 p.293 | 1890 C.d. (part.), J. Bonnier in: Bull. sei. France Belgique, v.22 p. 186 t.10 | 1892 (©. d., G. O. Sars, Crust. Norway, ».1 © p».278 1.98 f.2; t.99 f.1 | 1893 C.d. (part.), A. Della Valle in: F. Fl. Neapel, ».20 p.581 t.58 f.85 | 1871 C. schiodtei, A. Boeck in: Forh. Selsk. Christian., 1870 p. 145. Head, lateral corners acutely produced, with a small tooth below and ‚to the rear of the prineipal projection. Peraeon segments 6 and 7 and pleon - segments 1 and 2 produced backward in a curved tooth. Side-plates 2 and 3 with 4 or 5 coarse serrations eurving forward at lower hind corner; 4! emarginate behind, angle of emargination acute. Pleon segment 3, postero- lateral corners much produced. Eyes large, oval, dark red. Antenna 1, 1° joint long, rather longer than 24, both triangularly produced at apex, flagellum - _slender, twice as long as peduncle, 20-jointed; in JS longer than in ©, with long sensory setae on flagellum. Antenna 2 much shorter and more slender than antenna 1, ultimate joint of peduncle shorter than penultimate; flagellum - rather longer than pedunele. Lower lip not easily disseeted ont (see the greatly - differing figures by Bonnier and Sars). Mandible with accessory plate, a - minute fringe representing spine-row, and a smooth projeetion answering to molar, long 34 joint of palp finely furred. Maxilla 1, inner plate without setae, outer probably with 6 spines, palp elongate, 1-jointed (in Boeck’s figure - — 2-jointed). Gmnathopod 1, 6! joint nearly linear, shorter than the long, narrow 5b, Gmathopod 2, 5*h joint narrowly cup-shaped, 6 subtriangular, constricted at base, much widened distally, palm little ”oblique, fringed with spinules, defined by a tooth. Peraeopods 1—5 very slender, 24 joint in peraeo- pods 3—5 oblong oval, obliquely truncated at lower hind corner. Uropods land 2, rami narrow, acute, constrieted towards the end and furnished with 2 spines at the constrietion. Uropod 3, peduncle broad at base, produced at apex, longer than ramus, of which the 1° joint is twice as long as 24 and carries 2 apical spines. Telson ending in an acute piece flanked on each side of its base by an acute little tooth (not shown in Bonnier’s figure). Colour dark brown, spotted. L. © 3 to about 6 mm, S much less (Sars). North-Atlantie and North-Sea (Norway, depth 36—146 m; France; Great Britain). N en EEE IN 2 a an Sr eh ser = 192 Cressa, Stenothoidae, Stenothoe 2 C. minuta Boeck 1871 C. m., A. Boeck in: Forh. Selsk. Christian., 1870 p. 146 | 1876 C. m., A. Boeck, Skand. Arkt. Amphip., v.2 p.469 t.18 f.7 | 1892 CO. m., -G. O. Sars, Crust. Norway, v.1 p.280 t.99 f.2 | 1885 Danaia m., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 190 | 1890 Cressa dubia (part.), J. Bonnier in: Bull. sci. France Belgique, v.22 p. 186 | 1893 C.d. (part.), A. Della Valle in: F. Fl. Neapel, .v.20 p. 581. In general resembling C. dubia (p. 191). Back not dentate, though the imbrication of the segments may produce the appearance of dentation. Head, lateral corners acutely produced, with no inferior dentiele. Side-plates 2 and 3 with a single tooth ceurving forward at lower hind corner, 4! with angle of ‚emargination not very acute. Pleon segment 3, postero-lateral angles moderately produced. Eyesrather small, round. Antennal, flagellum 12-jointed. ‘Gnathopod 1, 6" joint little more than half length of 5t", Peraeopods 3—5, ‚24 joint regularly oval, not truneate at lower hind corner. L. © 3—5 mm. North-Atlantie and North-Sea (Norway, Firth of Forth). 3. C. abyssicola O. Sars 1879 ©. a., G. O.Sars in: Arch. Naturv. Kristian. v.4 p.453 | 1892 C.a., G.O. Sars, Crust. Norway, v.1 p.278 | 1885 Danaia a., G. 0. Sars in: Norske Nordhavs-Exp., 0.6 Crust.I p. 190 t.16 f.1, 1a | 1890 Oressa dubia (part.), -J. Bonnier in: Bull. sei. France Belgique, v.22 p.186 | 1893 C. d. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 581. In several respeets agreeing with C.dubia(p.191). Body compact, notdorsally ‚dentate. Head, lateral corners acutely produced. No eyes. Antenna 1 longer than the body, 1° and 24 joints not apically produced. Antenna 2 scarcely half length of antenna 1. Gnathopod 2, 5" joint narrowly produced, 6!" large, palm almost transverse and straight, with a regular series of 8 spines on ‚either side. Peraeopods 3—5, 24 joint regularly oval. Colour whitish. L. 6 mm. Arctie Ocean (between Finmark and Beeren Island, depth 841 m; Greenland, ‚depth 376 m). 11. Fam. Stenothoidae 1871 Subfam. Stenothoinae, A. Boeck in: Forh. Selsk. Christian., 1870 p. 188 | 1888 Stenothoidae, T. Stebbing in: Rep. Voy. Challenger, e.29 p.747 | 1892 S.,, 6.0. -Sars, Urust. Norway, v.1 p. 234. Agreeing with the Metopidae (p. 171), except in some points of the mouth-organs. Lower lip with the inner lobes rudimentary, separate. Mandible without molar or palp. Maxilla 1, palp 2-jointed. Maxillipeds (Fig. 51 p. 193), inner plates small, separate, outer obsolete. Peraeopod 3, 24 joint perhaps sometimes, but generally not, expanded ; peraeopods 4 and 5 with 24 joint expanded. Marine. 1 genus, 15 accepted species and 3 doubtf£ul. 1. Gen. Stenothoe Dana 1852 Stenothoe, J.D. Dana in: Amer. J. Sci., ser.2 v.14 p.311 | 1853 $. (Sp. un.: S. validus), J. D. Dana in: U, S. expl. Exp., v.13u p. 923 | 1888 $., T. Stebbing in: Rep. Voy. Challenger, v.29 p.748 | 1892 S., G. O. Sars, Crust. Norway, v.1 p.235 | 1893 -S., A. Della Valle in: F. Fl. Neapel, v.20 p.564 | 1853 Probolium (Sp. un.: .P. polyprion), a - Stenothoe 193 A.Costa in: Rend. Soc. Borbon., n. ser. v.2 p.170 | 1856 Montagua (non Leach 1813/14, - Decapoda!), Bate in: Rep. Brit. Ass., Meet.25 p.57 | 1857 M. (part.), Bate in: Ann. nat. Hist., ser.2 v.19 p.137 | 1871 Metopa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.140 | 1883 Montaguana, Chilton in: Tr. N. Zealand Inst., v.15 p.78. Antennae 1 and 2 usually subequal, flagellum long in antenna 1, peduncle in antenna 2. Mandible, molar evanescent. Maxilla 1, palp large. Maxillipeds (Fig. 51), inner plates very small, outer evanescent or wholly absent, palp elongate, 4tk joint ciliated on concave margin. Gmnathopods 1 and 2 more or less distinetly subchelate. _ Gmathopod 1, 4 joint produced into a lobe along side of the 5th (except in S. peltata, p. 194). Gmathopod 2, 6 joint powerful, usually differing to some extent in the 2 sexes. _ Peraeopod 3, 24 joint linear (except in _ Fig. 5ı. 8 valida, p. 194). larinipeds. Be 15 species accepted, 3 obseure. 4 Synopsis of accepted species: e: i | Back earmnle 0. u. a 1. 8. richardi . . . . p.194 ei: Back not carinate — 2. E Peraeopod 3, 24 joint expanded ....... 2 BR valide... p. 194 :- 2 N Peraeopod 3, 2d joint not expanded — 8. 3 3 f Gmathopod 1, 4th joint not-distinetly produced 3. 8. peltata . . . . p.194 E. | Gnathopod 1, 4th joint distinetly produced — 4. & ä [ Gnathopod 1, 2d joint strongly bent at base . 4. S. antennulariae . p.195 = Gnathopod 1, 2d joint straight — 5. BR „ f Uropod 3, 2d joint of ramus genieulate. ... 5. 8.ceattai ... .. p- 195 E { Uropod 3, 2d joint of ramus straight — 6. 4 Gnathopod 2, palm with a single deep excavation 6. S.elypeata. ... . p.195 # 6 Gnathopod 2, palm with more than one or with no excavation — T. Uropod 3, peduncle much shorter than ramus — 8. 5a 7 Uropod 3, peduncle longer or scarcely shorter @ than ramus — 9. E Gnathopod 2, 6th joint subquadrate, palm slightly R: 8 en ER RESET 7. S. monoculoides . p. 196 B Gnathopod 2, 6th joint elongate, palm extremely E Ge ne Re 8. S.dollfusi . . . . p.196 Ri: | Peraeopods 3—5, 4th joint narrow and little 9 produced —- 10. | Peraeopods 3—5, 4th joint widened and produced — 11. Antennae 1 and 2 of considerable length, palm #2 10 | of gnathopod 2 in d not deeply ineised. . 9. 8.tenella. .... p- 196 E. Antennae 1 and 2 extremely long, palm of gnatho- er 2 pod 2 in 5 deeply ineised . ....... 10. 8. megacheir . . . p. 197 5 1 | DE GV ee en. 11. 8. mierops . . . . p. 197 e Eyes well developed — 12. EB 19 ! Gnathopod 2 in , palm dentieulate throughout 12. 8. marina . . . . p.198 B- Gnathopod 2 in 3, palm dentieulate only at apex 13. 8. bosphorana*) . p.198 RE 13 ! Gnathopod 2 in Q, palm defined. ...... 14. S. brevicornis . . p.199 & | Gnathopod 2 in 2, palm undefined. .... .» 15. S. adhaerens.. . . p.199 *) S. bosphorana 2 is distinguished from $. brevicornis 2 by the gnathopod 2 with palm ill-defined, and from S. adhaerens 2 by the gnathopod 1 with 4th joint not “ produced to apex of 5th, In S. marina the telson has 2 spines on each side, in S. adhaerens 4, in S. brevicornis none. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 13 Br et: a2 he a a N BE I AN a ee a aa year alt Eh An Et 2 E 194 Stenothoe 1. 8. richardi Chevreux 1895 S. »., Chevreux in: M&m. Soe, zool. France, v.8 p.432 f. Head, lateral angles broadly rounded, rostrum little eurved. Body much compressed, dorsal carina produced into a tooth on each segment from 39 of peraeon to 3% of pleon. Side-plate 2 irregularly pentagonal, 4th wider than deep, rounded behind. Pleon segment 3, postero-lateral angles strongly produced, sharply uncinate. Eyes very "large, round. Antenna 1, 1% and: 24 joints subequal, 34 very short, flagellum 18-jointed. Antenna 2. ultimate joint of peduncle rather longer than long penultimate, flagellum very short, 10-jointed. Maxillipeds, ultimate joint of palp longer than penultimate. Gnathopod 1, 4% joint not quite reaching apex of 5th, 6th Jong oval, rather longer than 5". Gmathopod 2, 6! joint broadest at base, where there is a small spinous protuberance, reached by long finger eurving over crenulate palm. Peraeopod 5, 24 joint exceptionally broad and expanded. Uropod 3, peduncle much longer than ramus, of which 24 joint is rather longer than ea Telson broadiy oval, 4 spines on each side, one median, a acute. .d 5 mm. Bay of Biscay (lat. 47° N., long 8° W.). Depth 748—1262 m. 2. S. valida Dana 1852 S., J. D. Dana in: Amer. J. Sei., ser.2 ..14 p.311" 1853 & 55 S. validus, J.D. Dana in: U. S. expl. Exp., v.1311 p.924; t. 63 f.1a— 0 | 1893 S. valida (part.), A. Della Valle in: F. Fl. Neapel, ©.20 p.566 t.58 f. 74—-78 | ?1853 Probolium polyprion, A. Costa in: Rend. Soe. Borbon., n. ser, e.2 p. 173 | 1876 Steno- thoep., A. Boeck, Skand. Arkt. Amphip., v.2 p.446 | 1866 Probolium megacheles, Cam. Heller in: Denk: Ak. Wien, ©. 26n p.13 t.2 f£.1,2. Eyes small, round. Antennae 1 and 2 nearly equal; antenna 1 as figured is the shorter in O, the longer in 0. Antenna 2, ultimate joint of peduncle shorter than penultimate. Gnathopod 1, 4" joint longer than 5th, its base in S longer, in 9 shorter, than the produced part, 6% narrow oval, finger (as figured) much larger in J than in ©. Gnathopod 2, 4! and 5t% joints short, 6 in JS very large, oblong, margins nearly parallel, an obtuse tooth at lower apex, finger long and stout, hind margin of hand partiy pubescent (Costa: minutely serrate); in the © this joint is rather smaller, more oval, with a small tuberele in place of the tooth, finger shorter and less powerful. Peraeopods 3—5, 24 joint well expanded, 4 joint moderately so. Uropod 1 extending beyond uropod 2, and uropod 2 beyond uropod 3. Uropod 3 (as figured) has peduncle stout, rather shorter than ramus, of which 24 joint is longer than 1°. Telson apparently carrying 3 lateral spines. L. 6—8 mm. | Tropical Atlantie (Rio Janeiro); Mediterranean? 3. S. peltata S. I. Sm. 1876 S.p., S.I. Smith (& Harger) in: Tr. Connect. Ac., ©.3 p.29 t.3 f.5—8 | 1893 S.p., A. Della Valle in: F. Fl. Neapel, v.20 p. 570. Side-plate 3 deeper, not wider than 2%, 4 as wide (or long) as length of peraeon segments 1—5. Eyes round, nearly white in spirit. Antenna 1 in ©, flagellum 8-jointed, scarcely longer than peduncle. Antenna 2 rather longer than antenna 1, ultimate and penultimate joints of pedunele subequal, flagellum subequal to that of antenna 1. Gnathopod 1, 4 joint triangular, distally broader than 5*h, 5th parallel-sided, 6 narrower but slightly longer than 5t", distally narrowed, finger about half aslong. Gnatho- pod 2, 6% joint nearly twice as long as broad, palm convex, slightly oblique, DE a ST Hera Stenothoe 195 ‚defined by an acute lobe within which tip of finger closes. Peraeopods 1 and 2 slender. Uropod 3, ramus slightly longer than peduncle. L. Q about 6 mm. North-Atlantie (St. George’s Banks [United States of America]). Depth 55 m. 4. S. antennulariae Della Valle 1893 S.a., A. Della Valle in: F. Fl. Neapel, 0.20 p.565 t.30 f.1—18 ! 1896 8. crassicornis (part.), A. O. Walker in: Rep. Brit. Ass., - Meet. 66 p.420 | 1897 S$.c., A. O. Walker in: J. Linn. Soec., 0.26 p.229 t.18 f.3—3e. Body robust. Side-plate 1 very small, 4% large, subtriangular; depth and width subequal. Eyes small, eircular, rosy. Antenna 1, 1° and 24 joints equal in length, flagellum with 7—11 slender Joints. Antenna 2, ultimate and - penultimate joints of peduncle equal, flagellum short, 6- or 7-jointed. Maxillipeds, inner plates exceedingly small, outer quite wanting, palp slender. Gnatho- pod 1. 24 joint notably bent at the base, 4!" not nearly reaching apex of 5ih, Gh oval, rather longer than 5t%. Gmathopod 2, 4 and 5th joints short, 5b wide distally, 6 much larger in J than in 9, in © having the palm defined at some distance from the base by a tooth to which the long finger reaches eurving over another tooth or projection much nearer the hinge, (this projeetion being subdivided in J as well as in oO: Walker); 6th joint in © almond-shaped, with some slight teeth at intervals over which the moderately sized finger curves. Peraeopods 3—5, 4% joint decurrent, 24 and 4! expanded in peraeopods 4 and 5. Uropod 3 with very short peduncle, 1° joint of the ramus with several spines, 24 rather shorter, with 1 spine (unless supposed 1° joint be in reality the peduncle, and supposed 24 joint an indistinctly 2-jointed ramus). Telson oval, with 2 (Della Valle; 3, Walker) ‚Spines on each side; apex acute. Colour pale greyish with some yellow spots, ova bluish-green. L. 15—2 mm. B Gulf of Naples (depth 50-80 m, on Hydroids, especially Antennularia and E Aglaophenia myriophyllum (L.)); Irish Sea (W.-S.-W. of Calf of Man, depth 42 m). 5. S. cattai Stebb.*) 1876 Probolium polyprion (err., non A. Costa 1853!), Catta in: Ann. Sei. nat., ser.6 ».3 nr.1 p.15 t.2 f.1 | 1893 Stenothoe valida (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 566 | 1897 8. crassicornis (part.), A. OÖ. Walker in: J. Linn. Soc., 0.26 p. 229. Eyes small, round, black. Antenna 1 in CS rather shorter than antenna 2. - Antenna 1, flagellum 20-—25-jointed; antenna 2, ultimate and penultimate Joints of peduncle subequal, flagellum 15—24-jointed, thicker than flagellum of _ antenna 1. Gnathopod 1, 4" and dt" joints side by side, much shorter than the 6% joint, which is trapezoidal, twice as long as broad, back and front margins parallel, palm oblique, finely erenulate, well defined. Gnathopod 2 nearly as in S. valida and S. dollfusi (p. 194, 196), 6% joint with hind margin - pubescent and ending in 2 apical teeth, finger eleft at the apex. Peraeopod 3, 24 joint expressiy stated to be not expanded. Uropod 2 shorter than the others. - — ÜUropod 3; peduncle a little longer than the ramus,-of which the 24 joint is geniculate. Telson twice as long as broad, produced to a little apical - point, 3 spines on each side, scattered hairs on the surface. L. Q 3 mm. Mediterranean. B- 6. 8. clypeata Stimps. 1853 $. c., Stimpson in: Smithson. Contr., .6 nr.5 p.5l! 1893 8. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 569 | ?1862 S. clypeatus, Bate, Cat. Be . Amphip. Brit. Mus., p.61 t.9 £.7. | Eyes conspicuous, red. Gnathopod 1 slender, 6% joint small. Gnathopod 9, : Be joint very large, palm excavate between 2 teeth, of which the proximal *) Spec. nov. After J.D. Catta. ” 18* 196 Stenothoe is the larger. Peraeopod 3, 24 joint not expanded. Colour bright yellow; in the young pale bluish. L. 12:5 mm. Fundy Bay (Grand Manan). Depth 55 m. 7. S. monoculoides (Mont.) 1815 Cancer (Gammarus) m., Montagu in: Tr. Linn. Soe. London, v.11 p.5 t.2 f.3 | 1828 G@. m., G. Johnston in: Zool. J., v.3 p.179 | 1856 Montagua m., Bate in: Rep. Brit. Ass., Meet. 25 p.57 | 1869 Probolium m., A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.273 | 1871 Stenothoe m., A. Boeck in: Forh. Selsk. Christian., 1870 p.140 | 1892 $. m., G. O. Sars, Crust. Norway, v.1 p.240 t.82 f.1 | 1893 S. m. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.568 t.58 £.79 | 1881 Probolium tergestinum, Nebeski in: Arb. Inst. Wien, «.3 p.143 t.13 f. 39. Back broad. Head scarcely produced in front, lateral corners obtusely angular. Side-plate 4 larger than 24 and 3% combined. Pleon segment 3, postero- lateral angles somewhat produced. Eyes small, round, dark red. Antennae l and 2 subequal, rather short and stout. Antenna 1, flagellum of 12 very distinet joints, longer than pedunele. Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum 10-jointed, longer than peduncle. Maxillipeds, joint supporting the palp large and laminar, palp rather short and stout. Gnathopods 1 and 2 similar in the 2 sexes, also similar to one another in structure, not in size, 4 and 5th joints short, 5t% distally wide, 6" oblong quadrangular, palm well defined, nearly transverse in gnathopod 1, more oblique in the larger gnathopod 2. Peraeopods 1—5 slender throughout, except for expanded 24 joint in 4 and 5%, Uropod 3, pedunele very short and broad, with 3 strong spines, each joint of ramus about equal to it in length. Telson oblong oval, without spines, apex evenly rounded. Colour whitish with orange-red blotches about middle; ova in pouch dark bluish. L. O0 3 mm. North-Atlantie. North-Sea, Skagerrak and Kattegat (Norway, Denmark, France, Great Britain); Black Sea. Littoral, among Algae. 8.8. dollfusi Chevreux 1887 S.d., Chevreux in: Bull. Soc. zool. France, ». 12 p. 3827, 297 f. | 1891 S. d., Chevreux in: Bull. Soe. zool. France, ©.16 p.260 f.6--10 | 1893 8. d., A. "Della Valle in: F. Fl. Neapel, v.20 p. 570. Head, lateral angles rounded, little produced. Body ie Side- plate 4 as wide as 24 and 34 combined, hind margin truncate. Eyes round. Antenna 1 long, 1° joint rather longer than 24, flagellum with 15 long slender joints. Antenna 2 rather shorter, ultimate joint of peduncle much shorter than penultimate, flagellum 10-jointed, nearly as long as pedunele. Gnathopod 1, 4th and 5th joints rather long, side by side, 6! oval, subequal to 4b or a little longer. Gnathopod 2, 4 and 5tk joints subequal, not elongate, 6" in G very long and narrow, hind margin densely hirsute, ending in 3 coarse teeth or tubercles; the finger almost as long as the 6 joint, with cilia on the concave margin, the apex cleft; in Q the 6tk joint is broader and less long, the hind margin not very hirsute, with 2 tubercles following an excavation; the finger shorter than in C, smooth and apically pointed. Peraeopods 1—5 long and very slender, 29 joint of peraeopods 4 and 5 less expanded than usual and with the hind margin almost ‚straight. Uropod 3, peduncle much shorter than the spinose ramus. Telson long, with 3 spines on each side. L. 3 mm. Mediterranean (Cannes); North-Atlantie (Azores). Depth 130 m. 9. S.tenella O.Sars 1882 S.t., G.O.Sars in: Forh. Selsk. Christian., nr. 18 p-88 t.3 f.12 | 1892 S.t., G. O. Sars, Crust. Norway, v.1 p.238 t.81 f.2 | 1895 8.t., A. Della Valle in: F. Fl. Neapel, v.20 p. 570. Stenothoe 197 Body slender. Head, lateral corners angular. Side-plate 3 distally widened, 4th scarcely as wide as 24 and 34 combined. Pleon segment 3, postero-lateral corners triangularly produced. Eyes large, round, imperfectly developed, light red. Antennae 1 and 2 long, slender, subequal, more than half length of body. Antenna 1, 24 joint longer than 1°, flagellum about twice as long as pedunele, 21-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum about 11-jointed. Gnathopod 1 small, 4" joint produced about to apex of 5th, 6th scarcely broader than 5". Gmnathopod 2 in J, 6!" joint narrow oblong, palm undefined, concave, pubescent, distally dentate and incised almost at riecht angles to the length, finger long, powerful, concave margin hairy; er in o 6% joint somewhat tapering, palm irregularly serrated, finger and hand less powerful than in C. Peraeopods 1—5 long and slender, none of the joints expanded, except 24 in peraeopod 4 narrow oval and in peraeopod 5 broad aval. Uropod 3, peduncle much longer than ramus; armed with 8 spines, joints of ramus equal. Telson oblong oval, nearly twice as long as broad, obtusely pointed, 3 spines on each side. Colour whitish, banded irregularly with patches of light red; ova violet. L.Q 5'5 mm. North-Atlantic and North-Sea (West-Norway). Depth 150—282 m. 10. S. megacheir (Boeck) 1871 Metopa m., A. Boeck in: Forh. Selsk. Christian., 1870 p. 143 | 1876 M. m., A. Boeck, Skand. Arkt. Amphip., v.2 p.462 t.18 f.1 | 1892 Stenothoe m., G. O. Sars, Crust. Norway, v.1 p. 242 t. 83. Body slender. Head, lateral ecorners bluntly angular. Side-plate 3 distally widened, 4" scarcely as wide as 2 and 34 combined. Pleon segment 3, postero- lateral corners triangularly produced. Eyes large, round, indistinctly developed, licht vellowish red. Antennae 1 and 2 extremely long and slender. Antenna 1 ‚as long as body, 24 joint of peduncle longer than 1°t, flagellum filiform, twice ‚as long as pedunele. Antenna 2 in O a little shorter, in S a little longer than antenna 1, ultimate and penultimate joints of peduncle subequal, very long. flagellum much shorter than either. Maxillipeds very slender and elongated. Gnathopod 1 small and feeble, 4! joint not quite produced to apex of 5th, 6" not longer and scarcely broader than 5t, Gmathopod 2, large and powerful, especially in J, 6% joint oblong oval, palm long, defined, having in d 3 deep ineisions with denticulation above and below them, in © slightly concave, irregularly serrate; finger curved, strong, inner margin in © eiliated. Peraeopods 1—5 long and slender, none of the joints expanded, except 24 in peraeopods 4 and 5 not very broadly oval. Uropod 3, peduncle with 10 spines, nearly twice as long as ramus, of which the 2 joints are subequal, very slender. Telson oblong oval, apically narrowed, 3 spines on each side. Colour whitish, pellueid, with scattered orange patches; ova violet. L.8 mm. North-Atlantie and North-Sea (West-Norway). Depth 150282 m. 11. S. mierops O. Sars 1892 $. m., G. O. Sars, Crust. Norway, v.1 p.237 t.81 f.1 | 1893 S. monoculoides (part.), A. Della Valle in: F. Fl, Neapel, e.20 p. 907. Not very sharply distinguished from S. marina (p. 198). Body rather ‚robust. Head, lateral corners broadly rounded. Side-plates and pleon segment 3 nearly as in S. marina. Eyes very small, round, imperfectly developed, light red. Antennae 1 and 2 comparatively shorter than in S. marina, nearly equal. - Gnathopod 2 in Q, 6tk joint elongate, palm coarsely dentated, reaching nearly to base. Uropod 3, peduncle with 8 spines, longer than ramus, of which 2° joint is shorter than 1%. Telson rather broadly oval, 4 spines on each TE SE ONE a EEE RER a A Ve re 198 Stenothoe side. Colour highly pellucid, whitish, with reddish patches; ova small, bluish grey. L. 0 85 mm. North-Atlantie (Norway); North-Sea, outside the great fishing banks. Depth 188m. 12. S. marina (Bate) 1856 Montagua marinus (nom. nud.), Bate in: Rep. Brit, Ass., Meet.25 p.57 | 1857 M. m., Bate in: Ann. nat. Hist., ser.2 v.19 p.137 | 1866 Probolium marinum, Cam. Heller in: Denk. Ak. Wien, 0.2611 p.14 | 1871 Stenothoe - marina, A. Boeck in: Forh. Selsk. Christian., 1870 p.139 | 1892 S. m., @.O. Sars, Crust, Norway, e«.1 p.236 t.80 | 1861 8. danai, A. Boeck in: Forh. Skand. Naturf., Mede 8 p. 655 | 1893 S. monoculoides (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 568. Body moderately slender. Head, lateral corners rounded. Side-plate 2 rather small, with little tooth at lower hind corner, 34 distally expanded, 4th nearly as wide as 2% and 39 combined. Pleon segment 3, postero-laterar corners not strongly produced. Eyes small, round, well developed, dark red. Antenna lin 2 nearly.half as long as body, 24 joint of peduncle shorter than 1°, flagellum longer than peduncle, 14—18-jointed. Antenna 2 rather shorter than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum 10—12-jointed. Antennae l and 2 in J rather longer than in 9. Gmathopod 1, 4! joimt produced nearly to apex of 5%, which is distally widened, 6! rather longer than 5%, distally widened, palm obliquely convex. Gnathopod 2 powerful, ie joint broad at base and tapering in Q, longer and narrower at base in JG, palm well defined, almost all the length of the hand, denticulate throughout and in C coarsely so at the apex, finger very long, in JS eiliate on inner margin. Peraeopods 3—5, 4" joint rather expanded and produced, 24 joint long oval in peraeopod 4, broadly oval in peraeopod 5. TUropod 3, peduncle . with 6 spines, subequal to ramus, of which 24 joint is little shorter than 1. Telson oblong oval, obtusely pointed, 2 spines on each side. Colour pellucid whitish, mottled with yellow and with pinkish patches. L. © 5, d 6 mm. North-Atlantie and North-Sea (Norway, France, (Great Britain); Adriatie. Depth 37—94 m. 13. S. bosphorana Sowinski 1898 S.Db., Sowinski in: Mem. Soc. Kiew, v. 15 p.498 t.11 .2325 (249); t.12 £.9—19. Closely resembling Proboloides grandimanus (p. 187), except in regard to mandible. Head, rostrum feeble. Eyesrather large, round. Antenna 1 in J shorter than antenna 2, first 2 joints equal, 39 about '/, as long as 24, all 3 almost bare, flagellum with 11 or 12 joints, 1° the longest;'accessory fagellum rudimentary, 1-jointed. Antenna 2 in C, ultimate joint of peduncle considerably longer than penultimate, flagellum rather shorter than ultimate joint of peduncle, with 8 joints, 1° the longest. Antennae 1 and 2 in © differing from those of JS, antenna 1, flagellum with 15 joints, 1° not longer than the following; antenna 2, ultimate and penultimate joints of pedunele much shorter than in C, flagellum thrice as long as ultimate joint of peduncle, 11- or 12-jointed. Mouth- parts as usual in the genus. Gnathopod 1 in JS, 4" joint not nearly reaching apex of 5th, 5th rather longer than the narrowly oblong oval 6%, palm oblique, ill-defined, finger not large. (Gnathopod 1 in ©, 5% joint much shorter than 6, Gnathopod 3 in S, 4 and 5th joints very "short, 4th apically acute, 5'h eup-shaped, 6% rather longer and much stouter than 24, oblong oval, but with transverse apex serrate in 4 dentieles and projeeting outward in a small tooth, over which the great finger bends, reaching nearly to end of hind (or palmar) margin, this being bordered with setules interspersed with 4 or 5 minute spines; inner margin of finger setulose, apex not eleft. = “4 . = 3 E t ; E d: . Stenothoe Gnathopod 2 in O, 6% joint almond-shaped with almost rectilinear front margin and eonvex hind margin. Peraeopod 1 longer than peraeopod 2; peraeopod 3 _ similar to peraeopods l and 2; peraeopods 4 and 5, 24 joint oval, wider and - more produced in peraeopod 5 than in 4, 4! joint produced downward. ‚behind. Uropod 1, rami equal, each figured with 2 (outer with 3 in text), ‚pedunele with 6 spines. Uropod 2 little more than half as long as uropod 1. . Tropod 3, pedunele with 3 spines, basal joint of ramus with 3; fig. 24 represents ‚a biramous pair, neither branch 2-jointed. Telson ‘oval, with 2 spines above, 2 setules below on each lateral margin. L. about 3°5 mm. Bosphorus. Depth 32 m. 14. S. brevicornis O.Sars 1882 S.b., G. O.Sars in: Forh. Selsk. Christian., nr.18 p.89 t.4 f.1 | 1892 S.b., G. O. Sars, Orust. Norway, v.1 p.241 t.82 f.2| 1893 8. b., A. Della Valle in: F. Fl. Neapel; v.20 p.569. Body rather robust. Head, lateral eorners obtusely angular. Side- siste: 3 distally widened, 4'h about as wide as 24 and 34 combined. Pleon segment 3, z postero-lateral corners almost quadrate. Eyes round, well developed, dark red. Antennae 1 and 2 very short. Antenna 1 about ?/, length of the body, 24 joint shorter than 1°, flagellum scarcely longer than peduncle, 12-jointed. Antenna 2 ‚subequal to antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum as long as either. Gmathopod 1, 4" joint not reaching apex of 5’, 6% as long as 5%, much wider, widening distally, palm well defined, straight, moderately oblique. Gnathopod 2 in Oo, 6% joint much larger than in gnathopod 1, but similar in shape, palm defined by a projecting angle, ‚sinuous, dentieulate near the finger hinge, finger not very strong. Peraeo- .pods 1—5 rather short and stout, 4th joint i and produced, 24 joint in peraeopod 5 more broadly oval than in peraeopod 4. _ Tropod 3, peduncle rather broad, longer than ramus, with 5 minute spines; 24 joint of ramus smaller than 1%. Telson oblong oval, obtusely pointed, devoid of spines. Colour whitish, ova bluish green. L. © 8 mm. Arctic Ocean, North-Atlantie and North-Sea (Norway). Depth 94 m. = 15. 8. adhaerens Stebb. 1888 S. «., T. Stebbing in: Rep. Voy. Challenger, 2.29 p.748 t.39 f 1893 S.a., A. Della Valle in: F. Fl. Neapel, v.20 p. 569. Head, lateral corners rounded. Side-plate 4 searcely as wide as 2!and 3 combined. Pleon segment 3, postero-lateral angles little produced, obtuse. Eyes ‚rounded oval, well developed. Antennae 1 and 2 subequal, not elongate. Antenna 1, flagellum 17-jointed. Antenna 2, ultimate joint of pedunele shorter than penultimate, flagellum 15-jointed, nearly as long as peduncle. Maxillipeds (Fig.51 p.193), inner plates minute, outer wanting. Gmathopod 1, 4% joint produced quite to apex of 5th, 6! Jonger than 5", palm well defined, somewhat oblique, finely pectinate. Gnathopod 2 in O, 6% joint not twice as long as broad, palm undefined, irregularlv but finely denticulate on the part near to the hinge of the long broad finger. Peraeopods 3—5, 4" joinf"expanded and produced strongly, 24 joint more broadiy oval in peraeopod 5 than in peraeopod 4. Uropod 3, peduncle subequal to ramus, with several spines, 24 joint of ramus shorter than 1%. Telson long oval, apex subacute, 4 pairs of lateral spines. L. about 6 mm. Southern Indian Ocean (Cape Agulhas). On serew of H.M. S. Challenger. x S. guerinii (Bate) 1862 Montagua 9., Bate, Cat. Amphip. Brit. Mus., p.59 t.9 £.5 | 1893 Stenothoe valida? (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. "569. Indian Ocean (Madagascar). RE Nr ER TEN RS BO ENER er ie en 200 Stenothoe, Phliantidae, Phlias S. longimana (Bate) 1862 Montagua l., Bate, Cat. Amphip. Brit. Mus., p. 57 £.9 f.1 | 1885 Probolium longimanum, J. V. Carus, Prodr. F. Medit., v.1 p.407 | 1898 Stenothoe?, A. Della Valle in: F. Fl. Neapel, ©.20 p. 569. „Piedmont“. S. miersii (Hasw.) 1880 Montagua m. + M. longicornis (3?), Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.823 t.24 f.4; p.323 t.24 f.5 | 1883 Montaguana m., Chilton in: Tr. N. Zealand Inst., «. 15 p.79 | 1885 Probolium m., Chilton in: P. Linn. Soe. N.S.Wales, v. 9 p. 1043 | 1893 Stenothoe monoculoides? + Montagua miersüi, A. Della Valle in: F. Fl. Neapel, v.20 p. 569. L. about 4 mm. South-Paeifie (Port Jackson [East-Australia]; Timaru and Lyttelton Harbour [New Zealand)). 2. Fam. Phliantidae 1899 Phliadidae, 'T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 414. Peraeon strongly developed. Pleon segments 5 and 6 subjectto degradation (Fig. 52). Antennae 1 and 2 short. Antenna 1 without accessory flagellum, flagellum with sensory filaments. Upper lip with distal margin usually undivided. Lower lip without inner lobes. Mandible without palp. Maxilla 1 with palp obsolete. Maxillipeds variable. Gmathopods 1 and 2 simple or only feebly subchelate. Peduncle laterally produced in one or more of the pleopods (Fig. Ra): Uropod 3 usually not biramous. Telson short, entire. Marine. 6 genera, 6 species. Synopsis of genera: 1 j Maxillipeds, palp 3-jointed — 2. \ Maxillipeds, palp 4-jointed — 4. 0 f Uropod 3 biramous. ........2... 2 4, Gen.’ Phlias . . . 2.200 \ Uropod 3 not biramous — 8. 3 j Uropod 3, pedunele and ramus distinet. . . .. 2. Gen. Pereionotus . p.201 \ Uropod 3, ramus not distinet from pedunele. . 3. Gen. Palinnotus. . p.202 f Pleopod 3 (Fig. 53), inner ramus rudimentary . 4. Gen. Iphiplateia. . p.203 \ Pleopod 3, inner ramus well developed — 5. | Side-plates 1—4 very deep . . : 22 2... 5. Gen. Iphinotus . . p. 204 ’ | Side-plates 1—4 very shallow . .. 2.2.2. 6. Gen. Bireenna. . . p.205 1. Gen. Phlias Guer. 1836 Phlias, Guerin (-Möneville) in: Mag. Zool., C1.7 t.19 | 1840 P., H. Milne Edwards, Hist. nat. Crust., v.3 p.23 | 1853 P., J. D. Dana in: U. S. expl. Exp., v. 1311 p. 908 | 1862 P., Bate, Cat. Amphip. Brit. Mus., p.83 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.165 | 1899 P., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 414. Body short, laterally u Peraeon segments 1—7 tubereulately carinate. Pleon segments 5 and 6 coalesced, or 5t" missing. Head small, partially immersed in peraeon segment 1. Side-plates 1—4 large. Eyes prominent. Antennae 1 and 2 short, antenna 1 the longer and much the stouter, both elosely similar to those of Pereionotus, as likewise the limbs, so far as is known. Maxillipeds, palp 3-jointed. Pleopod 3 (uropod 1 according to ER ne De 5 F Phlias, Pereionotus 201 Guerin) with pedunele short, and 2 much longer, equal, eiliated rami. Uropod 1 with blunt equal rami, as long as peduncle. Uropod 2 wanting as in Pereionotus (9). Uropod 3 very short, with 2 conical rami as long as peduncle. Telson small, transverse, a little rounded (text) or a little emarginate. 1 species. 1. P. serratus Guer. 1836 P.s., Guerin (-Meneville) in: Mag. Zool., C1.7 t.19 f.1—4 | 1862 P.s., Bate, Cat. Amphip. Brit. Mus., p.88 t.14a f.2 (on t.21) | 1888 P. s., T. Stebbing in: Bon. Voy. Challenger, v.29 p.165 ete. | 1893 P.s., A. Della Valle in: F. Fl. Neapel, v.20 p.561 | 1899 P.s., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 e.7 p. 417. Colour opaque a brown. L. 5—6 mm. : South-Paeifie (between the Malouines (Falkland) Isles and Port ‚Jackson |East- Australia]); Mediterranean. = 2. Gen. Pereionotus Bate & Westw. ER 1862 Pereionotus (Sp. un.: P. testudo), Bate & Westwood, Brit. sess. Crust., ®. 1 ——— ».226 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.340 | 1893 P., A. Della ; Valle in: F. Fl. Neapel, v.20 p.559 | 1899 P. (part.), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.416 | 1864 Ieridium (Sp. un.: I. fuscum), E. Grube in: Jahresber. - — —— Sechles. Ges., v.41 p. 58. 5 Body depressed, ridged, hind part of pleon ventrally foxed. Head, _ _ rostrum short, obtuse, lateral corners carrying prominent eyes. Antennae 1 and 2 small, antenna 1 the larger, flagellum in both small. Upper lip bilobed. Lower lip without inner lobes. Mandible, eutting edge dentate, spine-row of | very few spines and a seta, molar and palp wanting. Maxilla 1, inner plate wanting, outer plate with 5 spines, palp wanting, its place indicated by a bulge of the margin. Maxilla 2, inner and outer plate coalesced except at apex. Maxillipeds, inner plates with 3 spine-teeth on truncate apex, outer plates almost unarmed, reaching end of 24 joint of palp or further, palp small, of 3 joints, 1° largest. Gnathopods 1 and 2 simple. Peraeopods 1—5 as in gnathopods 1 and 2 with hooked finger. Peraeopods 3 and 4, 2 joint roundly expanded, 4 joint also wide. Peraeopod 5, 24 and 4" joints smaller than in peraeopods 3 and 4. Pleopods 2 and 3 sending out an arm from peduncle (as in Iphiplateia, p. 203, but much shorter), tipped with 3 coupling spines. Uropod 1 reaching much beyond the others, pedunele as long as or longer than rami, outer ramus rather the shorter, slightly curved, both rami obtuse, - _ tipped with-short, blunt spine. In © (?) uropod 2 not developed, uropod 3, pedunele subequal to single spine-tipped ramus. In C (?) uropod 2 much - _ shorter than uropod 1, but otherwise similar, especially as to the obtuse rami, E the pair of peduncles "distally convergent, uropod 3 very short, with tubercle 0m inner margin of peduncle, single ramus not longer than broad, much E: shorter than peduncle. Telson small, triangular, depressed. a 1 species. E 1. P. testudo (Mont.) 1808 Oniscus t., Montagu in: Tr. Linn. Soc. London, 7.9 E p- 102 | 1862 Pereionotus t., Bate & Westwood, Brit. sess. Crust., v.1 p.228 f. | 1893 P.t., A. Della Valle in: F. Fl. Neapel, v.20 p.559 t.3 f.7; t.31 f.1—19 | 1862 Phlias rissoanus, Bate, Cat. Amphip. Brit. Mus., p.88 t.14a f.3 (on t.21) | 1875 Ieridium E rissoanum, Catta in: Rev. Sei. nat., v.4 p.161 | 1864 T. fuscum, E. Grube in: Jahresber. > Sehles, Ges., v.41 p. 58 | 1864 I. f., E. Grube in: Arch. Naturg., v.301 p.209 t.5 Be: 8.3, Ba—f. 202 . 3 Pereionotus, Palinnotus Peraeon segments 1—-7, pleon segments 1 and 2 tubereulately carinate and setulose, lateral tubereles on peraeon segments 2—7. Pleon segment 5 apparently missing in ©, short in S. Head flat, widening distally, a small point projecting below r eye. Side-plates 1—4 wide, outspread, fringed, 4b a little emarginate. Eyes subglobose, red (Montagu: black). Antenna 1, 15% joint very broad, with short obtuse apieal process, 24 shorter and narrower with small process, 34 seareely shorter, this and the little 1-jointed flagellum carrying long setae. Antenna 2 inserted some way behind antenna l, much shorter, only 3 free joints of peduncle, ultimate and penultimate joints subequal, flagellum 2- or 3-jointed, shorter than antepenultimate joint of pedunele, tipped with long setae. Gnathopods 1 and 2, 34 joint longer than broad, 4" triangular, underriding short 5", 6!" simple as in peraeopods, tipped. with spine. Peraeopods 1 and 2, 24 joint rather stout, not long, 4 and. le short, and broad in comparison with the length, 6 joint and finger similar in all the limbs. Colour dull red, with a white spot on the anterior part of the back, but as the insect dies this mark is lost (Montagu); uniform. yellow brown on segments of peraeon and pleon, with large white spots on 24 peraeon segment” (Della Valle). L. 3—4 mm. English Channel (South of Great Britain), Mediterranean. ‚3. Gen. Palinnotus Stebb. 1900 Palinnotus (Sp. typ.: P. thomsoni), T. Stebbing in: Ann. nat. Hist., ser. 7 v.5 p. 16. 43 0. In general agreement with Pereionotus, but distinguished as follows. Upper lip not bilobed. Maxilla ‘1 with a small spinule representing the palp. Maxillipeds, outer plates reaching slightly beyond the 3-jointed palp, and minutely fringed on distal half of inner margin. Pleopod 3, but not pleopod 2, with inner side of pedunele produced. Uropod 2 developed, short, uniramous. Uropod 3 without distinetion of peduncle and ramus. — d unknown. 1 species. 1. P.thomsoni (Stebb.) 1899 Pereionotus t., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.417 t,354 | 1900 Palinnotus t., T. Stebbing in: Ann. nat. Hist., ser. 7 v.5 p. 16. Body broad oval. Peraeon segments 1—7 and A segments 1 and 2 carinate, the medio-dorsal processes not quite as long as their segments, that on peraeon segment 1 preceded by am acute point directed forward. Head, rostrum small, but distinct, lateral angles a little in advance. Side- plates 1—4 without conspicuous setules on distal margin. Eyes rounded oval, dark, on lateral lobes of head. Antenna 1, 1° joint broad, 24 eylindrieal, 34 conical, flagellum small, 2-jointed. Antenna 2 shorter, much more slender, attached to the rear of antenna 1 on under surface of head, ultimate joint of pedunele rather longer than penultimate, flagellum with long setae, 1- or 2-jointed. Gnathopods 1 and 2 and peraeopods 1 and 2 as in Iphiplateia whiteleggei (p. 203). All the limbs have a rather strong spine at äpex and at middle of inner margin of 6 joint. Peraeopod 3, 24 joint broader than ‚ong, 4 not longer than 34, very broadly lobed. Peraeopods 4 and 5 with 24 and 4% joints successively much smaller than in peraeopod 3, 24 in peraeopod 5 with hind lobe not reaching instead of overlapping the 34 joint. Pleopod 2, peduncle broader than long, inner margin convex, but not a a Tr ze re . Er ya £ RR r ee TE De a a ge TEL ee N Fr ee Te h “ R- Palinnotus, Iphiplateia 203 produced. Pleopod 3 with the coupling spines on a short, but very distinetly produced process. Uropod 1, peduncle rather longer than the longer of the two rami, both rami narrow. Uropod 2, pedunele not reaching end of telson, the single ramus narrowly oval. Telson triangular, with rounded apex. L. rather under 5 mm. Watson’s Bay [East-Australia]. Low-tide line. 4. Gen. Iphiplateia Stebb. x 1899 Iphiplateia (Sp. un.: I. whiteleggei), T. Stebbing in: Tr. Linn. Soc. London, -ser.2 v.7 p. 414. Body much depressed, pleon strongly flexed. Heäd immersed between projeeting 1° pair of side-plates, square, feebly rostrate, front corners prominent, carrying the eyes. Side-plates I—4 large, outspread. Antennae 1 and 2 short, subequal in length, antenna 1 the broader, antenna 2 attached to the rear of antenna 1, on under side of head. Upper lip with convex distal margin. Maxilla 1, inner plate wanting, outer with 5 spines, palp wanting, but position for it indicated. Maxilla 2, inner plate short and broad, with apical spine-teeth, outer narrow, continuous with the base. Maxillipeds ‚rather broad, outer plates feebly armed, reaching apex of 24 joint of palp, finger of palp small, cylindrical, tipped with a long seta. Gnathopods 1 and 2 simple. Peraeopods 3—5, 24 joint very large, 4! broad. Pleopods 2 and 3, peduncle with produced process of inner margin. Pleopod 3, inner ramus rudimentary. Uropods 1 and 2 biramous, 29 the shorter. Uropod 3 very small, l-jointed. Telson entire. 1 species. 1. I. whiteleggei Stebb. 1899 I. w., T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.415 t. 34. Body (Fig. 52) forming a broad oval, by help of the 1° joint of antenna 1 and of 24 joint of peraeopods 3—5; dorsal line feebly angular or ‚smooth, peraeon segment 7 slightly upraised, pleon segment 1 projecting backward in a prominent tuberele, pleon small, segment 6 dorsally undeveloped. - Bide-plate 1 subtriangular, 24 and 34 oblong, 4" very broad, excavate behind, 5t" to 7th small, bilobed, front lobe the larger. Eyes small, oval, dark. Antenna 1, 15t joint nearly as broad as long, with large inner lobe, 24 similar, but smaller, 32 narrow, flagellum & very small, 2-jointed. Antenna 2, basal joints apparently soldered to underside of head, ultimate joint of pedunele rather smaller than penulti- mate, sliehtly longer than the small ER 2-jointed flagellum. Epistome roun- PR EN Doreal view, sek. ded above. Mandible, eutting edge cn nooked spines. Ä quadri-dentate, spine-row of 3 minute spinules; a broad pellueid spine tipped with a setule perhaps represents the molar. Gmnathopod 1, 29 joint not nearly reaching distal border of side-plate, 34 as long as 4th, 5fh a little longer than the tapering 6'", which forms no palm, finger small, eurved. Gnathopod 2 like gnathopod 1, but TEEN SER 204 Iphiplateia, Iphinotus 5th and 6*h joints more nearly equal. Peraeopods 1 and 2, 4th joint a little wider, not longer than 34, 5th as broad as long, much shorter than 6th, 6 and 7th nearly agreeing in all the limbs of peraeon. Peraeopod 3, 24 joint with the broad expansion produced below the 34 joint, 4! as broad as long, lobed behind. Peraeopod 4, 24 and 4tk joints larger than in peraeopod 3. Peraeopod 5 with 24 joint shorter than in peraeopods 3 and 4, but even wider, otherwise nearly as peraeopod 3. Pleopod 1, peduncle without process, but carrying 5 or 6 coupling spines. Pleopod 2, peduncle much shorter than in pleopod 1, with short, broad process carrying 5 or 6 coupling spines. Pleopod 3 (Fig. 53), pedunele very short, with long narrow process carrying 3 coupling spines, inner ramus minute, oval, unjointed, without setae, outer ramus normal. Uropod 1, peduncle shorter than the curved outer ramus, longer than the straight inner one. Uropod 2 much smaller, otherwise like the 1°. Uropod 3, each consisting of a small oval lamella, nearly eoncealed by the telson. Telson semi-oval, with subacute apex. L. about 5 mm. Watson’s Bay [East-Australia]. 5. Gen. Iphinotus Stebb. 1882 Iphigenia (Sp. un.: I. typica) (non ©. F. Schumacher 1817, Mollusca!), G.M. Thomson in: Tr. N. Zealand Inst., v.14 p.237 | 1899 Iphinotus (Sp. un.: I. chiltoni), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v©.7 p.419. - Body much depressed, pleon strongly flexed. Head immersed between the projeeting 1° pair of side-plates, square, feebly rostrate, front corners prominent, carrying the eyes. Side-plates 1—4 large, outspread. Antennae 1 and 2 nearly as in Ipbiplateia (p. 203), as also the mouth-parts, except that the maxillipeds have the 4 joint well developed, unguiform. Limbs of the peraeon nearly as in Iphiplateia, except that the 24 and 4 joints are very much smaller in peraeopod 5 than in peraeopods 3 and 4. Pleopods 1—3 with both rami well developed. Pleopods 2 and 3, pedunele laterally produced into a long-and strong process. Uropods 1 and 2 biramous, peduncle much longer than the rami. Uropod 1 slender, uropod 2 stout. Uropod 3 membranous, not biramous, small. Telson entire. 1 species. 1. L.typicus (G.M. Thoms.) 1882 Iphigenia iypieca, G.M. Thomson in: Tr. N, Zealand Inst., e. 14 p. 237 t. 18 f.4 ! 1899 Iphinotus chiltoni + Iphigenia typica, T. Stebbing in: Tr. Linn. Soe. London, ser.2'0.7 p.419 t.358; p. 420. Body broad oval, with dorsal carina. Eyes rounded oval, dark. Antennal, 1°t joint large, distally widened, 29 cylindrical, 3% scarcely longer than broad, flagellum with 3 small joints. Antenna 2, moderately stout, ultimate joint of peduncle longer than penultimate, flagellum with 5 joints, last 4 very small, setose. Upper lip broader than deep, distal margin almost straight. Gnathopods 1 and 2 and peraeopods 1 and 2 in general as in Palinnotus thomsoni (p. 202), except that the finger is abruptly narrowed at base of the sharp hooked nail, and has there a strong setule. Peraeopods 3 and 4, 24 joint very large, a little longer in peraeopod 3 than in peraeopod 4, 4 joint greatly expanded, hind lobe nearly . double the length of the front margin. Peraeopod 5, 24 and 4 joints very much smaller than in peraeopods 3 and 4. Pleopod 1, peduncle not very long, not expanded. Pleopod 2, peduncle short, produced on inner side to a long, powerful process, carrying 4 coupling spines. Pleopod 3 like pleopod 2, Iphinotus, Bircenna 205 but the process a little less massive. Uropod 1, peduncle slender, more than twice as long as the slender, subequal, finely ciliated rami. Uropod 2 shorter but much stouter than uropod 1, peduncle about twice as long as the stumpy rami, fringed near outer margin with about 11 short spines. Uropod 3 broad above, the pointed apex projecting just beyond the telson, the pair together not so broad as the telson. Telson much wider than long, obtuse-angled, a few slight setules at the sides. L. about 5 mm. Lyttelton Harbour and Otago Harbour [New Zealand]. 6. Gen. Bircenna Chilton 1884 Bircenna (Sp. un.: B. fulvus), Chilton in: Tr. N. Zealand Inst., v.16 p.264 | 1893 B., A. Della Valle in: F. Fl. Neapel, v.20 p.561 | 1899 B., T. Stebbing in: Tr. - Linn. Soe. London, ser.2 v.7 p.421. Body broad. Pleon segment 5 very short, 6" indistinet. Head broad, depressed in front. Side-plates all very shallow. Pleon segments 1—3, postero-lateral corners rounded. Antennae 1 and 2 short, antenna 1 rather the longer. Mandible without palp. Maxilla 1, inner plate with apical setae, outer with 8 apical spines, palp wanting, but margin of maxilla interrupted / at its point of disappearance. Maxillipeds, inner plates distally truncate, with 3 E spine-teeth, outer slightly armed, both reaching apex of 2% joint of palp, palp E short, 1° joint largest, 3 following successively both shorter and narrower, 4th very small. Gnathopods 1 and 2 almost simple. Peraeopods 1 and 2, 4 joint a little widened. Peraeopods 3—5, 24 joint expanded, larger in 4h than in 34, and much larger in 5th peraeopod; 4 joint rather expanded and deeurrent. Pleopods 1—3 biramous, with peduncle broadly produced on inner side. Uropod 1, peduncle shorter than acute, curved, very unequal rami; uropod 2 similar, but rather stouter and shorter; uropod 3, a single joint bifid, with outer apex rounded, inner (perhaps representing ramus) acute, setiferous. Telson short, entire. (a 4 1 species. 1. B. fulva Chilton 1884 B. fulvus, B. fulva, Chilton in: Tr. N. Zealand Inst., v.16 p.264, 265; t.21 f.1, la—e | 1893 B. fulva, A. Della Valle in: F. Fl. Neapel, v.20 p.562 1.58 £.73, 73* | 1899 B. f., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.421. Peraeon much larger than pleon. Head very prominent, protruding a little below the antennae. Eyes minute. Antenna 1. 1% joint as long as 24, flagellum as long as peduncle, 6 joints with sensory filaments. Antenna 2 with only 3 free joints of pedunele, ultimate as long as the 2 preceding combined, flagellum about as long as free part of peduncle, 4-jointed. Gnathopods 1 and 2, 34 joint longer than broad, as long as 4*h, 5th a Jittle shorter than 6%, which is not expanded, but a little produced at apex, yet not enough to make a chela with the short apieally toothed finger. Peraeopods 1 and 2 very like the gnathopods 1 and 2, except as regards the 4 joint. Peraeopod 5 much the largest. Telson nearly an equilateral triangle, with a setule on either side of subacute apex. Colour yellow. L. 3 mm. Lyttelton Harbour [New Zealand]. RE HEBEN EEE FR N 206 Colomastigidae, Colomastix 13. Fam. Colomastigidae 1893 Subord. Subiperini, A. Della Valle in: F. Fl. Neapel, v.20 p.853 | 1899 Colomastidae, Chevreux in: O.-R. Ass. Franc., Sess. 27 v.2 p.483 | 1899 Colomastigidae, T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 211. Body cylindrie, subdepressed. Head, rostrum small, acute. Side-plates all shallow, none bilobed. Eyes distinet. Antennae 1 and 2, peduncle well developed, flagellum minute, antenna 1 (always?) the longer, without actessory flagellum. Epistome conical. Upper lip bilobed. Lower lip probably without inner lobes. Mandible, eutting edge divided into spine-like teeth, no accessory plate, spine-row, or palp; molar small. . Maxilla 1, inner plate wanting, outer feebly armed, palp 1-jointed. Maxilla 2, inner plate the broader, only slightly separated from outer. Maxillipeds, inner plates completely coalesced, outer broad, reaching to middle of Rn: 2° joint, palp 4-jointed, 39 joint longest. SeHDERNR 1 and 2 simple in ©, in © gnathopod 2 subchelate. Peraeo- pods 1—5 subequal, 24 joint but little expanded. Pleopods, rami few-jointed. Uropod 3, rami lanceolate. Telson entire. Marine. 1 genus, 3 species. 1. Gen. Colomastix Grube 1861 Colomastix (Sp. un.: ©. pusilla), E. Grube, Ausfl. Triest, p. 157 | 1888 (., T. Stebbing in: Rep. Voy. Challenger, v.29 p.329 | 1893 ©., J. Bonnier in: Bull. sei. France Belgique, v. 24 p; 202 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p.854 1862 Cratippus (Sp. un.: CO. tenuipes), Bate, Cat. Amphip. Brit. Mus., p. 275 | 1869 Exunguwia (Sp. un.: E. stilipes), (A.M. Nonmhn, in:) G.S. Brady &D. Robertson in: Ann. nat. Hist., ser.4 v,3 p. 859. With the characters of the family. 3 species. Synopsis of species: f j..Uropod 8, rami. very uregual .; 2... 8 Kur 1. ©. brazieri . p.206 \ Uropod 3, rami subequal — 2. { Gnathopod 1, 34 joint rather elongate . .. .... 2. C. pusilla . . p. 207 Gnathopod 1, 34 joint not elongate . ... 2... 3. C. hamifera . p. 207 1. ©. brazieri Hasw. 1880 €. b,, Haswell in: P. Linn. Soc. N .S.Wales, v.4 p- 341 t.22 f.4 | 1893 ©. pusilla (part.), A. Della Valle in: F. Fl. Neapel, «.20 p.851. Eyes round, rather prominent. Antennae 1 and 2 subequal, spinose, pedunele slightly compressed; antenna 1, 1% joint stouter and rather longer than 24, not as long as 24 and 34 combined, flagellum shorter than 34 joint of pedunele, 4- (Haswell) or (?)3-jointed. Antenna 2, 34 joint stout, as long as ultimate joint of pedunele, penultimate rather longer, flagellum with 1 distinet Joint, perhaps followed by I or 2 minute terminal joints. Epistome very acute, maxillipeds and probably other mouth-parts as in C. pusilla. Gnathopod 1, 24 joint membranous, slightly widened, 3% rather long, 4% a little longer, "5th and 6% Jinear, 5tk much longer than 6t", the latter tipped with fasciele of spines, one of which may be the finger. Gnathopod 2 more robust, 3% and 4" joints not elongate, zth eup-like, rather broad, much shorter than 6*k, very spinose. 6‘ in Oo elongate oval, apically narrowed, hind margin spinose, palm short, Colomastix ill-defined, overlapped by small slender finger, in JS broadly oval, narrowed ‚at the oblique obscurely bidentate palm, finger rather stout, not overlapping palm. Peraeopods 1—5 moderately robust, 4% joint a little widened. ranchial vesieles narrow, marsupial plates very long and broad. Uropods 1 and 2, peduncle subequal to rami, rami nearly equal, longer in uropod 1 than in uropod 2; uropod 3, pedunele shorter than telson, inner ramus long narrowly lanceolate, reaching much beyond those of uropods 1 and 2, outer very short, spine-like. Telson conical, compressed, almost acute at apex. Colour light green. L. about 10 mm. Port Jackson [East-Australial. Depth 4--18 m. “R 2. C. pusilla Grube 1861 €. p., E. Grube, Ausfl. Triest, p.137 | 1864 ©. Ps E. Grube in: Arch. N Naturg., 0.301 p.206 t.5 f.2,2a—b | 1888 C. p., T. Stebbing in: Rep. Voy. Challenger, v.29 p.329 | 1893 C.p., J. Hospser in: Bull. sei. France Belgigüe, 0.24 p.203 t.8| 1893 C.p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.854 t.6 2.2; t.61 f.23-—37 | 1862 Cratippus tenuipes, Bate, Cat. Amphip. Brit. Mus., p. 276 t.46 f.10 | 1876 ©. £., T. Stebbing in: Ann. nat. Hist., ser.4 v.18 p.447 t.20 £.4.4a- e| - 1866 (. erassimanus -+ ©. pusillus, Cam. Heller in: Denk. Ak. Wien, ®. 2611 p. 50; t.4 f. 12, 13 | 1869 Exunguia stilipes, (A. M. Norman in:) G. S. Brady & D. Robertson "in: Ann. nat. Hist., ser.4 v.3 p.359 t.22 f. 7—12. Head, lateral cornersrounded. Pleon segments 1—3, lateral angles rounded. Eyes small, round, red, the lenses outlined with white. Antenna 1 longer and _ much stouter than antenna 2, 1° joint not as long as 24 and 34 combined, flagellum of 1 short and 2 minute joints. Antenna 2, penultimate joint rather longer than the stout antepenultimate or narrower ultimate, all serrulate, flagellum as in antenna 1. Epistome subacute. Lower lip apically broad, prominent at centre. Maxilla 1, outer plate small on large base, armed with 2 or 3 spinules, the short 1-jointed palp carrying 4 slender spines. Maxillipeds, inner plates forming one piece, simply conical or blunt, outer plates feebly armed, _ reaching middle of 24 joint of palp, of which 34 is rather longer than 24, finger _ obtuse, setulose. Gnathopod 1, 29 joint widened distally, 4" rather longer than 34: 5 and 6th subequal, finger spine-like, distinguished from the group of - spines about it by the attached tendon; gnathopod 1 atrophied in C (Della - Valle). Gnathopod 2, 34 and 4th joints short, 5% and 6!" in © subequal in length, spinose, 6! rather tapering, palm ill-defined, finger moderately strong, in G 5tl short, cup-like, 6!" greatiy enlarged, palm divided into 3 large blunt processes, finger robust (Heller’s €. erassimanus). Peraeo- pods 1—5 subequal, not very robust, 24 joint little dilated. Branchial vesicles narrow. Uropods 1—3, rami broad, lanceolate, slightly serrulate, 34 shortest, in all rami subequal. Telson suboval, entire, longer than broad EB . (Della Valle), -or distally widened with apical border slightly concave, broader i than long (Bonnier).. Colour ivory white with pale dorsal markings, or greyish, dorsally tinted with ochre. L. 4—5 mm. ® h Mediterranean, North-Atlantie (France, Great Britain). u: 3. C. hamifera Kossm. 1880 C. hamifer, Kossmann, Reise Roth. Meer., v.21 E: Malacost. p.136 t.15 f. 1-10 | 1893 C. pusilla (part.), A. Della Valle in: F. Fl. Neapel, Di v.20 p. 854. Like C. pusilla (p. 207) (of which it is perhaps a young J) except in . the following respects. Antenna 1 rather more slender than the equally long antenna 2. Gmnathopod 1, 3% joint short. Gmathopod 2, 5% joint as broad as Be ee a TEE En zeEr Scheren 302 Free ES ee nn a ei "u EN = + Be A I ER re ae “ig ker) 208 Colomastix, Lafystiidae, Lafystius long, shorter than the large 6*%, which is oblong oval, with obscurely defined undivided palm. Uropod 1, one ramus slender, the other a little longer and very much broader, except at the rather abruptly acute apex. Telson (in fig.) seemingly oval. L. 2:5 mm. Red Sea. 14. Fam. Lafystiidae 1893 Laphystiidae, G. ©. Sars, Crust. Norway, v.1 p. 382. Body depressed. Head, rostrum broad, tapering, not acute. Side- plate 4 the deepest. Eyes distinet. Antenna 1 stouter and longer than antenna 2, no accessory flagellum. Upper lip entire, distally narrowed. Lower lip without inner lobes. Mandible, eutting edge dentate, accessory plates on left and right, no spine-row or molar, palp large, 39 joint longest. Maxilla 1, inner plate with 3 setae, outer with 8 spines, palp rudi- mentary, nodiform. Maxilla 2, outer plate longer than inner, inner setiferous on inner margin. Maxillipeds (Fig. 54), inner plates narrow, not short, outer large, Fig. 54. overlapping the 2-jointed palp. Gmathopod 1 simple, are raonnga gnathopod 2 weakly subchelate. Peraeopods 1—5 stout, subequal, finger uncinate. Uropod 3, rami obtuse, inner the longer. Telson small, entire. Marine. 1 genus, 1 species. 1. Gen. Lafystius Krayer 1842 Lafystius (Sp. un.: L. sturionis), Kroyer in: Naturh. Tidsskr., v.4 p. 156 | 1888 L., T. Stebbing in: Rep. Voy. Challenger, v.29 p.898 | 1893 L., A. Della Valle in: F. Fl. Neapel, v.20 p. 587 | 1846 Laphystius (nom. em.), L. Agassiz, Nomenel. zool., Index p.200, 202 | 1876 L., Lafystius, A. Boeck, Skand. Arkt. Amphip., v.2 p.250, 712 | 1893 Laphystius, G. O.Sars, Crust. Norway, v.1 p.383 | 1856 Darwinea (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 Darwinia (Sp. un.: D. compressa), Bate in: Ann. nat. Hist., ser.2 o.19 p.14l | ?1870 Dermophilus (Sp. un.: D. lophii) (non Dermatophilus Guerin-Möneville, 1829—38, Diptera), E. Beneden & Bessels in: Möm. cour. Ac. Belgique, v.34 nr.4 p.26 | ?1873 Ichthyomyzocus (part.), E. Hesse in: Ann. Sei. nat., ser.ö ©.17 nr.7 p.5 | ?1877 Desmophilus, Huxley, Man. Anat. Invert., p. 367. With the characters of the family. 1 species. 1. L. sturionis Kroyer 1842 L.s., Kroyer in: Naturh. Tidsskr., v.4 p: 157 | 1875 L. s., Schiedte in: Naturh. Tidsskr., ser.3 v. 10 p.237 t.5 f.9---18 | 1876 L. s., A. Boeck, Skand. Arkt. Amphip., v.2 p.252 t.19 £.6 | 1888 L. s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.899 t. 137» | 1893 L. s., A. Della Valle in: F. Fl. Neapel, v.20 p-588 1.6 f.8; t.32 f£.20—37 | 1893 Laphystius s., G. O. Sars, Crust. Norway, v.1 p.384 t.134 | 1856 Darwinea compressus (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.58 | 1857 Darwinia compressa, Bate in: Ann. nat. Hist., ser.2 «.19 p.141 | ?1870 Dermophilus lophi, E. Beneden & Bessels in: M&m. cour. Ac. Belgique, v.34 nr.4 p.26 | ?1873 Ichthyomyzocus morrhuae, E. Hesse in: Ann. Sei. nat., ser.5 «. 17 nr.7 p.7 t.4 £.3—7. Lafystius, Laphystiopsidae, Laphystiopsis 209 . Back broad, smooth. Head depressed, rostrum tapering to truncate apex, reaching end of 1° joint of antenna 1. Side-plates 1—3 rounded quadrangular, 4th much deeper, acutely triangular below, 5t" and 6!" with hind lobe acutely produced downward. Pleon segment 3, postero-lateral corners obtusely quadrate, segments 4—6 flattened. Eyes round, prominent, lateral, dark. Antenna 1, 15 joint longer than 24 or 34, all stout, flagellum as long as peduncle, tapering, 6 joints with sensory faseicles. Antenna 2 shorter, much more slender, ultimate joint of pedunele longer than penultimate, flagellum rather longer than peduncle, 8-jointed. Gnathopod 1 feeble, almost unarmed, 5t% joint shorter than narrowly oblong 6", finger long, ‚weak, nearly membranous. Gmathopod 2 stouter, 5tk joint subequal to nearly quadrangular 6t%, the small palm slightly produced, much overlapped by the rather stout and curved, bidentate finger. Peraeopods 1—5, 4tk joint rather wide, not long, finger strong, hooked. Peraeopods 1 and 2, 6% joint stout. Peraeopods 3—5, 24 joint oval quadrangular, in peraeopod 5 angled at lower hind corner. Uropod 1, - rami subequal, uropods 2 and 3, outer ramus shorter than inner; uropod 3, rami unarmed, ending obtusely. Telson rounded oval. Colour white, more or less pellucid. L. 7 mm. North-Atlantie and Mediterranean (from A Trondhjemsfjord to the Gulf of Salerno). On various fishes, Raja batis L., Lophius piscator L., Gadus morhua LE, Acipenser’ sturio L., Galeus galeus di). 15. Fam. Laphystiopsidae 1899 Laphystiopsidae, T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.211. Body depressed. Head, rostrum broad, not tapering. Side-plates all shallow, 5! the deepest. Eyes rudimentary. Antenna 1 slender, longer than antenna 2, no accessory flagellum. Upper lip apically broad, bilobed. Lower lip with small inner lobes. Mandible, eutting edge denticulate, accessory plate on left and right, no spine-row, molar weak, conical, palp slender, 34 joint longest. Maxilla 1, inner plate with 1 seta, outer with few spines, palp large, 1-jointed. Maxilla 2, inner and outer plates small, subequal, only setose at apex. Maxillipeds, inner plates short, outer small, not over- lapping 1° joint of 4-jointed palp. Gnathopods 1 and 2 small, simple. Peraeopods 1—5 not robust, 24 joint in all somewhat expanded, most in peraeopod 5, which is notably the longest. Uropod 3, peduncle very short, rami lanceolate. Telson entire. Marine. 1 genus, 1 species. 1. Gen. Laphystiopsis 0. Sars 1893 Laphystiopsis (Sp. un.: L. planifrons), G@.O. Sars, Crust. Norway, v.1 p.386. With the characters of the family. 1 species. 1. L. planifrons O. Sars 1893 L.p., G.O.Sars, Crust. Norway, v.1 p.386 t.135. Body rather slender, depressed anteriorly, segments imbricated. Pleon segments 3 and 4 with compressed gibbous dorsal projection, preceded in segment 4 Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 14 210 Laphystiopsis, Acanthonotozomatidae, Odius by a deep depression. Head depressed, rostrum horizontal, lamellar, broadly truncate, at its base forming lateral ridges on head. Side-plates 1—4 small, not contiguous, simple, 5!" and 6!" bilobed, 5 larger than any. Pleon segment 3 less deep than 24, narrower below, postero-lateral corners rounded. Eyes represented by 2 irregular patches of reddish pigment, coated with chalky white. Antenna 1, 1% joint distally widened, rather longer than 24, 34 short, flagellum more than thrice as long as pedunele, with 24 joints, 1°t longest, with 4 sensory fascieles. Antenna 2 much shorter, ultimate and penultimate joints of pedunele . subequal, flagellum twice as long as pedunele. Gnathopods 1 and 2, 5tk joint about as long as and rather wider than simply eylindrie slightly eurved 6%, finger small, strong, hooked. Peraeopods 1 and 2 with 24 joint broad, and 4th a little widened, otherwise very like the much smaller gnathopods 1 and 2. Peraeopods 3—5 successively longer. Uropods 1 and 2, outer ramus much the shorter, uropod 3, rami spinulose, acute, outer little shorter than inner. Telson nearly semieireular. Colour whitish. L. © 8 mm. Christianiafjord, Trondhjemsfjord, Arctic Ocean (Selsövig [Nordland]). Depth 188--752 m. 16. Fam. Acanthonotozomatidae 1871 Subfam. Iphimedinae, A. Boeck in: Forh. Selsk. Christian, 1870 p.178 | 1888 Iphimedidae, T. Stebbing in: Rep. Voy. Challenger, v.29 p.882 | 1893 IL, G. 0. Sars. Crust. Norway, v.1 p.372 | 1893 Dexaminidi, A. Della Valle in: F. Fl. Neapel, v.20 p. 556. Integument more or less indurated, processiferous. Head rostrate. Side-plates well developed, 1% —4tk usually acuminate. Eyes well developed. Antennae 1 and 2 seldom elongate or very different in length, accessory flagellum absent or rudimentary. Mouth-parts projeeting downward, and drawn out as if for piereing rather than biting. Gnathopod 1 very slender and feeble, simple or chelate; gnathopod 2 seldom strong. Peraeopods 3—5, 24 joint expanded, usually acute. at one or more points of. hind margin. Uropod 3, rami lanceolate. Telson unarmed, apically emarginate. Marine. 4 genera, 11 accepted species and 3 doubtful. Synopsis of genera: f Maxilla 1, palp 1-jomted ....... 1. Gen. Odys 7.2... 4 p- 210 \ Maxilla 1, palp 2-jointed — 2. Maxilla 1, palp not reaching apex of outer 0 RE a ee 2. Gen. Panoploea . . . . . p.211 | Maxilla 1, palp reaching Beyond apex of outer plate — 8, f Gnathopod 1 minutely chelate . . . . . 3. Gen. Iphimedia . . . . . p. 214 . \ Gnathopod 1 simple, wholly unchelate . 4. Gen. Acanthonotozoma . p.218 1. Gen. Odius Lillj. 1862 Otus (Sp. un.: O. carinatus) (non Jac. Hübner 1816, Lepidoptera!), Bate, Cat. Amphip. Brit. Mus., p.125 | 1865 Odius (nom. nov.), W. Lilljeborg in: N. Acta Soe. Upsal., ser.8 ©.6 nr.1 p.18 (tabella), 19 | 1893 O., G. O. Sars, Crust. DOrHen, v1 p. 380 | 1893 O., A. Della Valle in: F. Fl. Neapel, v.20 p. 581. Odius, Panoploea 211 Integument indurated, body compressed, carinate. Head, lateral corners well developed. Side-plates 1—4 rather large. Antennae 1 and 2 very short. Upper lip narrow, tapering, minutely bifid. Lower lip without inner lobes, outer acutely produced. Mandible produced to acute eutting edge, spine-row long, - spines short, molar distinet, small, palp slender, almost unarmed. Maxilla 1, inner plate small, tapering, outer elongate, tapering to. acute point, palp a minute conical joint. Maxilla 2, both plates long, narrow, obliquely truncate, inner the shorter. Maxillipeds, inner plates long, narrow, outer reaching much beyond 2 joint of palp, palp not long, finger minute. Gnathopod 1 feeble, slender, minutely chelate. Gmathopod 2 rather robust, subchelate. Peraeopods 1—5 stout, subequal, peraeopods 3—5, 24 joint expanded. Uropod 3, rami very unequal. Telson oblong, minutely ineised. 1 species. 1. ©. carinatus (Bate) 1862 Otus ce., Bate, Cat. Amphip. Brit. Mus., p. 126 t.23 f.2 | 1871.Odius e., A. Boeck in: Forh. Selsk. Christian., 1870 p. 182 | 1893 O. e., G. ©. Sars, Crust. Norway, v.1 p.381 t.135 f.2 | 1893 O.c., A. Della Valle in: F. Fl. Neapel, v.20 p.582 t.58 f. 86, 87. Short and stout but highly compressed, carinate from peraeon segment 1 to pleon segment 3, on pleon segment 2 with obtusely rounded projection, on segment 3 with erect acute process. Head, rostrum acute, vertical, well overlapping 1°* joint of antenna 1, lateral corners forming a large triangular lobe. Side-plate 1 tapering to obtuse point, 24 and 34 slightly narrowed below, 4th hroad below, hind margin oblique below emargination, 5!" and 6 with hind lobe truncate. Pleon segment 3, postero-lateral angles acutely but slightly ‚ produced, a sharp ceurved tooth higher up below a deep sinus. Eyes reniform, red. Antenna 1, 1° joint subequal to 2 and 32 combined, flagellum much shorter than peduncle, with 7 joints, last 3 very small, with long sensory filaments. Antenna 2 shorter, flagellum scarcely longer than ultimate joint of peduncle. Gnathopod 1, 24 joint widened proximally, rest of limb very slender, 5th joint narrow, much longer than 6t%, which is curved and forms a very small chela. Gnatho- pod 2, 4% joint produced into a narrow lobe, 5!" short, euplike, but narrowly produced, 6th hroad, widening distally, palm nearly transverse, finely denticulate. FE Peraeopods 1—5, 4th joint strongly produced over 5t, finger strong, curved, zu = peraeopods 3—-5, 24 joint quadrate, lower hind angle broadiy emarginate or slightly bilobed. Uropod 3, outer ramus much narrower than inner, and little more than "/, as long. Telson more than twice as long as broad, tapering to minutely incised apex. Colour whitish or variegated with dark brown shadings. L. © about 5 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland, Spitzbergen, Arctie America, Norway, Shetland Isles). Moderate depths to 113 m; on rocky bottom, among Algae and Hydroids. pe 2. Gen. Panoploea G. M. Thoms. 1880 Panoploea (part.), &. M. Thomson in: Ann. nat. Hist., ser.5 v.6 p.2 | 1881 Panoplaea, G. M. Thomson in: Tr. N. Zealand Inst,, v.13 p.212 | 1893 Iphimediopsis (Sp. un.: I. eblanae), A. Della Valle in: F. Fl. Neapel, 0.20 p. 585. Back broadly rounded, some segments produced into teeth. Rostrum acute. Side-plates 1—3 more or less acutely tapering, 4tt with projecting point of hind margin. Upper lip somewhat narrowed distally. Lower lip without inner lobes, outer ineised on inner margin near apex. Mandible narrowly tapering to cutting edge, accessory plate narrow, no spine row, molar exceedingly 14* 212 Panoploea feeble, 39 joint of palp not very long. Maxilla 1, inner plate with several setae, outer with 10(?) spines, palp 2-jointed, not reaching extremity of outer plate. Maxilla 2, outer plate the longer, rather the narrower, obliquely truncate, inner still more so and fringed for half its length. Maxillipeds, inner and outer plates long and narrow, outer fringed on distal part of. outer margin, 1% joint ofpalp notaslong as 22and 3% combined, 2% much produced along inner margin of 34, finger wanting. Gnathopods 1 and 2 very slender, gnatho- pod 1 with very small chela, gnathopod 2 more or less chelate. Peraeo- pods 3—5, 24 joint well expanded. Uropod 3, rami narrowly lanceolate. Telson broadly ineised at apex. 3 species accepted, 1 doubtful. z Synopsis of accepted species: Peraeopods4and5, 24 joint withlowerhind cornerrounded 1. P. spinosa . p. 212 5 | Peraeopods 4 and 5,24 joint with lower hind eorner acute — 2. 9 Peraeopod 5, 2d joint with an upper tooth on hind margin 2. P. eblanae . p. 212 | Peraeopod 5, 2d joint without upper tooth on hind margin 3. P. minuta . p.213 1. P. spinosa G. M. Thoms. 1880 P.s., G. M. Thomson in: Ann. nat. Hist., ser.5 v.6 p.3 t.1 f.2 | 1881 Panoplaea s., G.M. Thomson in: Tr. N. Zealand Inst., v.13 p.213 | 1888 Iphimedia s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.524 | 1893 I. s., A. Della Valle in: F. Fl. Neapel, v.20 p. 585. Peraeon broad, smooth, 7'% segment and pleon segments 1 and 2 dorsally produced into 2 teeth. Rostrum nearly reaching apex of 1° joint of antenna 1. Side-plates 5 and 6, hind lobes rounded. Pleon segments 2 and 3, postero-lateral eorners acute, scarcely produced. Eyes long, narrow, curved, pale reddish. Antenna 1, 1% jointlonger than 24 and 34 combined, with an apical tooth, 24 with 2 apical teeth, flagellum with 22 rather long joints, many with sensory filaments, 1st joint longest. Antenna 2 shorter, ultimate joint of peduncle rather shorter than penultimate, flagellum with 44 joints, all short except 1%. Upper lip slightly narrowing to insinuate apex. Mandible, apieal tooth obscurely subdivided, to the rear a 24 tooth probably representing the accessory plate, but apparently not free, molar a thin expansion slightly fringed with minute spinules, 34 joint of palp short, scarcely longer than 1°; its blunt apex obliquely truncate, slightly fringed, 24 joint little longer than 34. Maxilla 1, inner plate with 9 setae on oblique distal margin, outer with 10 spines, palp not rudimentary, but not reaching end of outer plate. Triturating lobes of stomach very small, with minute spine-teeth. Gnathopod 1, 5t" joint tapering, much longer than 6", otherwise as in Iphimedia (p. 214), with small finger opposed to very slender thumb. Gnathopod 2 rather stouter, 5!" joint shorter than 6", which widens a little distally and forms a little distinet chela with the small finger. Peraeopods 3—5, 24 joint strongly expanded, rounded oval, hind margin strongly serrate. Uropod 2, rami very unequal, uropod 3, pedunele with acute points, rami only a little unequal. Telson longer than broad, slightly tapering, apex widely not deeply emarginate. Marsupial plates large and long. Colour varying from light to dark brown, thickly covered with black stellate markings. L. 11 mm. Dunedin Harbour [New Zealand]. Depth 7—9 m. 2. P. eblanae (Bate) 1857 Iphimedia e., Bate in: Nat. Hist. Rev., «.4 P. Soc. p- 229 t.16 f. 1—7 | 1893 Iphimediopsis e., A. Della Valle in: F. Fl. Neapel, v.20 p.586 t.6 f.5 (inaceurate); t.32 f.1—19; t.58 f.93 | 1864 Iphimedia multispinis, E. Grube in: Arch. Naturg., v. 301 p.202 t.5 f.1!1864 I. m., E. Grube in: Jahresber. Schles. Ges., v. 41 p.58 | 1866 IT. eblanae + I. carinata, Cam. Heller in: Denk. Ak. Wien, v.2611 p. 28, 29 | ?1875 I. corallina, Catta in: Rev. Sei. nat., v.4 p. 164. E 3 4 E re Ei: Sa ai RR EE N n ET #3 Panoploea 213 Body stout. Peraeon segment 7, pleon segments 1—3 dorsally produced into a pair of strong teeth, pleon segments 1—3 also armed with a medio- dorsal earina-tooth. Rostrum flat above, narrow, reaching end of 1° joint of antenna 1. Side-plates 1-—3 pointed below, 4! with 2 emarginations, 5t— 7th with a backward direeted point. Pleon segments 2 and 3, postero-lateral corners acute, segments 1—3 with a medio-lateral tooth, in segment 3 all the teeth rather upturned. Eyes subreniform, bright red. Antenna 1, 1° joint longer than 24 and 34 combined, produced into 2 strong unequal apical teeth, 24 produced into 1 apical tootlı, flagellum longer than pedunele, 16-jointed. Antenna 2 rather longer, ultimate and penultimate joints ofpeduncle subequal, flagellum 20-jointed. Upper lip figured by Della Valle with truncate apex. Mandible, accessory plate doubtfully free, 24 joint of palp much the longest (as figured). Maxilla 1, palp very small, joints equal, inner plate with only 4 setae (Della Valle). .Gnathopod 1 very slender, 5tk joint longer than 6*%, chela.very delicate with 7 setae. Gnathopod 2 stronger, 5th joint subequal to 6", which widens distally and at apex is produced into a rounded lobe against which the small finger impinges more or less chelately, hind margin fringed with setules. Peraeopods 1—5, 6!" joint spinose, finger strong. Peraeopods 3—5, 24 joint quadrate, produced above into a strong tooth, lower hind angle acute. Uropod 1, rami as long as pedunele, uropod 2, rami rather shorter than pedunele, uropod 3, rami much longer than pedunecle. Telson short, boat- shaped, apex emar ginate. Colour variable, pinkish-white, with transverse bands of orange spots (Grube), sometimes entirely orange-yellow (Della Valle). L. about 7 mm. North-Atlantie (Ireland), Mediterranean. Depth 50 m, on coralline bottoms; also from Rhizostoma euvieri Per. & Les. 3. P. minuta (0. Sars) 1874 Iphimedia eblanae var., T. Stebbing in: Ann. nat. Hist., ser.4 v.14 p.11 t.2 f.4 | 1882.I. minuta, G.O. Sars in: Forh. Selsk. Christian., nr.18 p.100 t.5 f.2 | 1893 I. m., G. O. Sars, Crust. Norway, v.1 p.879 t.133 f.1 | 1893 -I. obesa (part.), A. Della Valle in: F..Fl. Neapel, v.20 p. 584. Peraeon segment 7, pleon segments 1—3 dorsally produced into a pair of strong teeth, with. no medio-dorsal tooth. Rostrum strongly curved, about reaching apex of Ist joint of antenna 1. Side-plates 1—-4 as in P. eblanae, 5th and 6" subtruncate on hind lobe, 7tk rounded. Pleon segments 2 and 3 as in P. eblanae. Eyes large, reniform, dark red. Antenna 1, 1° joint produced to . apical tooth not very large or acute, flagellum about twice as long as peduncle. Gnathopod 1, 5t% joint subequal to 6%, chela very delicate, with a few setae. Gnathopod 2, 6'% joint produced so as to make an almost perfect chela. Peraeo- pods 3—5, hind margin of 24 joint rounded above, not produced into a tooth, quadrate below, and in peraeopod 5 sharply produced, 4% joint decurrent. Uropod 3, inner ramus considerably longer than outer. Telson oblong quadrangular, scarcely tapering, broadly and angularly emarginate between acute apical points. Colour variable with bright bands, or dark brown shadows, or nearly black. L. © 5—6 mm. North - Atlantie, North -Sea and Skagerrak (South- and West-Norway, British Isles); Mediterranean. P. ambigua (Hasw.) 1880 Iphimedia? a., Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.327 t.24 f.2 | 1893 I. obesa (part.), A. DellaValle in: F. Fl. Neapel, v.20 p.584. Intermediate between P. eblanae and P. minuta. L. 2:5—3:75 nım. Port Jackson [East-Australia]. ‚214 Iphimedia 3. Gen. Iphimedia H. Rathke 1843 Iphimedia (Sp. un.: I. obesa), H. Rathke in: N. Acta Ac. Leop., v.201 p.85 | 1888 I., T. Stebbing in: Rep. Voy. Challenger, v.29 p.889 | 1893 I., G. O. Sars, Crust. Norway, v.1 p.876 | 1893 I., A. Della Valle in: F. Fl. Neapel, v.20 p.582 | 1846 Micro- cheles (Sp. un.: M. armata), Kroyer in: Naturh. Tidsskr., ser.2 v.2 p.58, 66. Back broadly rounded, some segments produced into teeth. Rostrum acute. Side-plates 1--3, at apex simply acute or bidentate, 4!" with projecting tooth between 2 emarginations. Eyes well developed. Antennae 1 and 2 not greatly differing in length. Upper lip little or not emarginate. Lower lip having outer lobes ineised on inner margin, thus forming an inner process, which may or may not represent the inner lobe. Mandible rather broadly tapering to blunt obscurely dentate cutting apex, accessory plate rather long, spine-row wanting, molar feeble (or sometimes wanting?), palp rather strong. Maxilla 1, inner plate with several setae, outer with (always?) 11 spines, palp 2-jointed, reaching beyond apex of outer plate. Maxilla 2 and nıaxillipeds as in Panoploea (p. 211). Gnathopods 1 and 2 very slender, delicately chelate, 32 joint not very short; 24 joint in gnathopod 1 sinuous. Peraeopods 3—5, 24 joint well expanded. Uropod 3, rami narrowly lanceolate. Telson broadly ineised at apex. 4 species accepted, 2 doubtful. Synopsis of accepted species: 1 f Side-plates 5—7 not acutely produced backward 1. Lobesa. .... . p- 214 1 Side-plates 5—7 acutely produced backward — 2, f Side-plates 5—7 forming each 2 acute processes 2. I. pulchridentata . p.215 2 \ Side-plates5—7 forming each 1 acute process — 3. Of peraeon segments only 7th with a pair of dorsal 3 BER ARTE AT ER RE 3.:L paeiflca : : ».. « .:p.215 { Of peraeon segments 4th—7th each with a pair oL-Borakl iueih ET ern 4. L’n0odosa 5’... p- 216 1. L. obesa H. Rathke 1843 I. o., H. Rathke in: N. Acta Ac. Leop., ©.201 p.85 t.3 £.1A—Q | 1876 I. o., A. Boeck, Skand. Arkt. Amphip., v.2 p.245 t.18 £.l1d—k 1889 I. o., Hoek in: Tijdschr. Nederl. dierk. Ver., ser: 2 v0.2 p.194 t.7 f.6 | 1893 I. o., G.O.Sars, Crust. Norway, v.1 p.377 t.132 | 1893 I. o. (part.), A. Della Valle in: F. Fl. Neapel, ©.20 p.584 t.58 f.92 | 1846 Microcheles armata, Kroyer in: Naturh. Tidsskr., ser.2 v.2 p.58 | 1846 M. a., Kroyer in: Voy. Nord, Crust. t. 11» f. 2a—v. Peraeon segment 6, pleon ‚segments 1—3 dorsally produced into 2 teeth. Head, rostrum strongly curved, overlapping. 1° joint of antenna 1, lateral corners deflexed, acute. Side-plates 1—3 tapering to acute apex, 5th and 6% with hind lobe the deeper, subtruncate at apex. Pleon segments 2 and 3, postero-lateral angles acute, segment 3 having an upper tooth subequal to the corner one. Eyes large, reniform, dark red, scarlet, or purplish. Antenna 1, 1° joint longer than 24 and 34 combined, forming a large apical tooth, 24 with small tooth, flagellum nearly thrice as long as peduncle, with about 24 joints, each with fasciele of sensory setae, more strongly developed inJ. Antenna 2 scarcely longer, ulti- mate joint of,pedunele longer than penultimate, flagellum about twice as long as peduncle. Upper lip distally narrowed, slightly emarginate. Mandible, accessory plate distinet on both left and right, molar almost obsolete, palp sturdy, 3% joint curved, much longer than 1°. Maxillipeds, 1° joint of palp as long as 24 and 34 combined, finger wanting (Sars) or rudimentary (Boeck). Gmathopod 1 very slender, 5" joint rather shorter than 6tt, chela about '/, length of 6tk joint, thumb not stouter than apically dentieulate finger. Gnathopod 2 rather stouter, Iphimedia. 215 Hr and 6 one subequal, 6!" setose, very slightly expanding to the chela, - which is less than ’/, of the whole length, thumb much stouter than finger. - Peraeopods 3—5, 24 joint oval quadrangular, the lower hind angle a little produced only in peraeopod 5, 4% joint decurrent. Uropod 3, rami long, nearly equal. Telson oblong, little tapering, angularly incised between = — 2 acute apices. Colour variable, whitish, striped with rosy pink, or lemon- > © /, length, dehiscent, with a spinule at each apex and a setule on each lateral margin. L. 8 mm. South-Paeifie (lat. 37° S., long. 83° W.). Depth 3246 m. 4. Gen. Nicippe Bruz. ee: EL 1859 Nicippe (Sp. un.: N. tumida), R.-M. Bruzelius in: Svenska Ak. Handl,, n.ser.v.3 nr.] p.99 | 1893 N., G. O. Sars, Crust. Norway, v.1 p.409 | 1893 N. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 657. Head with very small rostral projection, lateral corners produced. - Side-plates very shallow, not overlapping, 4" not emarginate, 5tk with front lobe the deeper. Antenna 1 in Q much longer than antenna 2, accessory flagellum small. Antenna 1 in JS rather shorter than antenna 2, 1° joint of fagellum long, bearded, 1° joint of accessory flagellum long, laminar. Upper lip moderately bilobed. Lower lip, outer lobes small, separated by a single inner lobe. Mandible, eutting edge broad, dentate, accessory plate broad, only present on left mandible, spine-row with small spines, 39 joint of palp not much shorter than 24. Maxilla 1, inner plate with 1 seta, outer with 8(?) spines, palp with 9 spine-teeth on expanded apex. Maxilla 2, inner plate a little shorter than outer, both slender. Maxillipeds, inner plates conical, small but not rudimentary, outer fringed with spines, narrow, not ‚reaching end of palp’s 1° joint, palp very large, 24 joint long, oval, 3% not much shorter, finger spinulose on inner margin. Gnathopods 1 and 2, 5th joint rather short, distal expansion densely setose, 6% long oval, finger long, curved, acute. Peraeopods 1 and 2, 4!" and 5tk joints equal, slightly widened, 6'% rather longer. Peraeopods 3—5 successively longer, slender, 24 joint - oblong, little expanded, finger stiliform. Uropods 1 and 2 strong, spinose, outer Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. ED 226 Nieippe, Synopioides ramus little shorter than inner; uropod 3 reaching beyond the others, rami subequal, setose on inner margin. Telson narrow, deeply cleft. 1 species. 1. N. tumida Bruz. 1859 N.t., R.M. Bruzelius in: Svenska Ak. Handl,, n. ser. v.3 nr.1 p.99 t.4 f.19 | 1868 N. t., A. M. Norman in: Ann. nat. Hist., ser. 4 v.2 p.414 t.21 £.4—6 | 1876 N. t., A. Boeck, Skand. Arkt. Amphip., &.2 p.492 | 1893 N. t., G. ©. Sars, Crust. Norway, v.1 p.410 t.144; t. 145 £.1 | 1893 N. t., A. Della Valle in: F. Fl. Neapel, v.20 p. 658 t. 59 f. 66, 67. Back broadly vaulted, subdepressed, pleon segment 4 with 2 contiguous very small dorsal teeth. Head, lateral eorners angularly produced, their lower margins continued backward as lateral projecting ridge. Side-plate 1 larger than any of the 3 following. Pleon segment 3, postero-lateral corners quadrate. Eyes represented by yellowish pigment near lateral margins of head. Antenna 1 in © long, slender, 1° joint as long as 24 and 34 combined, flagellum neariy 4 times as long as peduncle, 48-jointed, accessory flagellum with 3 or 4 joints, 1° as long as others combined. Antenna 2 in Q, ultimate and penultimate joints of peduncle equal, flagellum as long as peduncle, 18-jointed. Antenna 2 in d, flagellum long, filiform. Gnatho- pod 1, 6% joint very large and tumid, palm not defined, but subchelate by help of the long clasping finger. Gnathopod 2 like gnathopod 1, except that the distal expansion of 5 joint is: somewhat more prominent and very densely spinose. Peraeopod 5 very elongate, 24 joint behind submarginally armed with 2 (Bruzelius; 1 Norman; not noticed by Boeck and Sars) long strong setae, plumose on the distal half. Uropod 3 large, peduncle thick, setose on outer margin, rami oblong lanceolate, inner margin fringed with long setae, outer a little the longer. Telson nearly 3 times as long as broad, cleft nearly to the base, the division dehiscent more at the 2 extremities than in the middle, apices bidentate. Colour a tinged yellowish orange. L. © 14mm, | rather less. Arctic Ocean, North-Atlantie, North-Sea and Eck (Norway, Shetland Isles, Sound of Skye). Depth 113—565 m. 5. Gen. Synopioides Stebb. 1888 Synopioides, T. Stebbing in: Rep. Voy. Challenger, v.29 p.999 | 1893 $., A. Della Valle in: F. Fl. Neapel, ©.20 p.851. . Side-plates very shallow. Antenna 1, peduncle short, flagellum long, accessory flagellum rather long. Antenna 2 longer than antenna 1. Mandible (Fig. 60), cutting edge broad, denticulate, accessory plate on both mandibles, spine-row of 2 spines, palp very long, 39 joint linear, much shorter than 24, Maxilla 1, outer plate with 8 long spines, palp with 7 spine-teeth on distally widened 24 joint. Maxilla 2, inner plate fringed on inner margin, rather shorter than outer. Maxillipeds, inner plates small, conical, setiferous, outer small on a large base, with few fringing spines, palp long. Gnatho- pods l and 2 simple, 5!" and 6" joints long, narrow. Fig. 60. 8. macronyx. . : Mandibles and hing 3 Peraeopods 1 and 2 as in Pardalisca (p. 221), but rather more slender. Peraeopods 3—5 elongate, finger stiliform. Uropod 1, rami equal; uropod 2, outer ramus much the shorter; uropod 3, rami subequal, foliaceous. Telson deeply cleft. 1 species accepted, 1 doubtful. a E B; Synopioides, Pardaliscella 227 1. S. macronyx Stebb. 1888 S. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1000, 1223 t. 94a | 1893 S. m., A. Della Valle in: F. Fl. Neapel, v.20 p.852. Head apparently angled in front as in Synopia scheeleana (p.272). Side- plates 5 and 6 broader than the preceding. Pleon segments 1—3, postero- lateral angles acute, chiefly in segment 3. Eyes not perceived. Antenna 1, 1° joint short, as long as 24 and 34 combined, flagellum in © 5 times as long as peduncle, with 33 joints, 18 very long, first 6 or 7 very stout, then tapering, terminal 20 slender, the proximal joints armed with slender E spines and a large brush of long broad sensory filaments, accessory flagellum with 3 joints, together as long as the first 8 of primary. Antenna 2 longer, ultimate joint of peduncle elongate, shorter than the spinose penultimate, flagellum longer than peduncle, with about 30 unequal joints. Triturating lobes of stomach of peculiar character. Gmathopod 1, 5tk joint considerably shorter than the long, narrow, slightly curved 6, finger about half 6%, setulose, with tooth at base of the nail. Gnathopod 2, 5!" joint rather stouter and longer Be than the tapering 6", both densely furnished with setiform spines, some on the 5th of great length, finger more than '/, as long as 6", nearly as in gnathopod 1. Peraeopods 1 and 2 spinose. Peraeopod 3, 24 joint oblong, not very wide, 6% joint straight, slender, finger needle-like. Peraeopod 5, 24 joint piriform, very broad at the top. Uropods 1 and 2, pedunele and rami very spinose, in uropod 1 peduncle subequal to the rami, in uropod 2 peduncle as long as the shorter ramus, inner rather longer than rami of uropod 1. Uropod 3, pedunele much shorter than the broad lanceolate rami, which are setose on inner margin, outer the longer by the extent of its small 24 joint. Telson about once and a half as long as broad, cleft nearly to base, apices acute, bidentate, the inner points rather divergent, the outer considerably produced. L. 10 mm. South-Pacifie (lat. 38° S., long. 94° W.). Depth 2743 m. S.secundus Stebb. 1888 S.s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1224. Perhaps the & of $S. macronyx. L. 12 mm. South-Pacifie (lat. 39% S., long. 105° W.). Depth 3703 m. 6. Gen. Pardaliscella 0. Sars 1893 Pardaliscella (Sp. un.: P. boeckii), G&. ©. Sars, Crust. Norway, v.1 p. 407. Body slender, eylindrie, without dorsal processes. Head not rostrate. Side-plates as in Pardalisca (p. 221). Antennae 1 and 2 in O short, subequal, accessory flagellum small. Lower lip, outer lobes small, separated by a single inner lobe. Mandible not very strong; as to cutting edge, accessory plate and spine-row similar to those of Pardalisca, but weaker, palp slender, almost naked except at apex. Maxilla 1, inner plate with 1 seta, outer with 6 spines, 2 very stout, apex of palp moderately expanded. Maxilla 2 with few setae, inner plate a little shorter and wider than outer. Maxillipeds, inner plates conical, rather, not very, small, outer moderately broad, not reaching end of palp’s 1° joint, palp of moderate size. Gnathopods 1 and 2 stronger than in Pardalisca, 5% joint wider, scarcely longer than 6%, which narrows distally, finger simple, unguiform. . Peraeopods 1—5 nearly as in Pardalisca. Uropods 1 and 2, rami nearly equal, with few spinules; uropod 3, rami equal in length, quite naked, outer the narrower, with small 24 joint. Telson unarmed, deeply_cleft. 2 species, 15* ee SE a ee 298 Pardaliscella, Halice Synopsis of species: Pleon segment 3, postero-lateral eorners slightly rounded . . 1. P, boeckii . p. 228 Pleon segment 3, postero-lateral corners strongly rounded . . 2. P.axeli . . p.228 1. P.boeckii (Malm) 1871 Pardalisca b., A. W. Malm in: Öfv. Ak. Förh., 0.27 p.547 t.5 £.2 | 1893 Pardaliscella b., G. O. Sars, Crust. Norway, v.1 p.408 t.143 f.2 | 1893 Pardalisca abyssi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 692. Peraeon long. Head, lateral corners slightly projeeting, evenly rounded. Side-plate 1, front corner acute, 5" in front as deep as 4{h, Pleon segment 3, postero-lateral corners evenly rounded, little prominent. Eyes inconspicuous in speeimens in spirit. Antenna 1 inQ, 1° joint longer than 24 and 34 combined, flagellum rather longer than pedunele, about 12-jointed, accessory flagellum small, 2- or 3-jointed. Antenna 2 scarcely longer, ultimate joint of peduncle subequal to penultimate, flagellum subequal to the 2 combined. Gnathopods 1 and 2, 5% joint not longer than 6°, finger with small dentiele at middle of concave margin. Peraeopods 1 and 2 less setose than in Pardalisca (p.221). Peraeopod 3, 24 joint rather narrow, 6! linear, finger as long as 6%, Peraeopod 5, 24 joint more widened, finger not so long as 6. Uropods 1 and 2, rami lanceolate, each with a single spinule at about middle of each margin. Telson not quite twice as long as broad, distally tapering rapidly to acute apices, cleft rather beyond middle. L. (a presumably young specimen) 2:5 mm (Malm), © adult, scarcely exceeding 4 mm (Sars). Skagerrak (Bohuslän), Christianiafjord. Depth 188 m. 2. P. axeli Stebb.*) 1871 Pardalisca boeckii (err., non Malm 1871!), A. Boeck in: Forh. Selsk. Christian., 1870 p. 152 | 1876 P.b., A. Boeck, Skand. Arkt. Amphip., v.2 p.485 t.10 f.4. Differing from P. boeckii by following characters. Side-plate 1, front corners rounded (in fig.) Pleon segment 3, postero-lateral corners broadly rounded and (in fig.) strongly outdrawn. Antenna 1, flagellum longer than peduncle, 16-jointed, accessory flagellum 2-jointed. Antenna 2 shorter, ultimate joint of peduncle shorter than penultimate, flagellum shorter than peduncle, 10—12-jointed. Gnathopods 1 and 2, 5tk joint a little longer than 6th, Telson lanceolate, cleft to the base. L. 8—10 mm. Christianiafjord, North-Sea (Karmöe). 7. Gen. Halice Boeck 1871 Halice, A. Boeck in: Forh. Selsk. Christian., 1870 p. 152 | 1893 H., G. 0. Sars, Crust. Norway, v.1 p.411 | 1895 H., A. Della Valle in: F. Fl. Neapel, v.20 p. 661. Head, rostrum small but distinet. Side-plates very shallow. Eyes wanting. Antennae 1 and 2 slender, much stronger in d. Antenna 1 the shorter. Mandible, eutting edge moderately wide, a small accessory plate on both mandibles, palp not very large, 34 joint very short. Maxilla 1, inner plate with 1 seta, outer with 6(?) spines, 24 joint of palp not distally expanded. . Maxilla 2 comparatively large. Maxillipeds, inner plates almost obsolete, outer as long as their base, overtopping 1° joint of palp, fringed with a few spines, palp not very large. Gmathopods 1 and 2 not very powerful, simple. Peraeopods 1 and 2 as in Pardalisca (p. 221). Peraeopods 3—5 long, slender, 24 joint rather narrow, finger stiliform. Uropod 3, rami extended *) Sp.nov. After Axel Boeck. Halice, Liljeborgiidae 229 < considerably beyond the others, subfoliaceous, inner margin setose, outer ramus with small 24 joint. Telson narrow, unarmed, deeply cleft. 1 species. 1. H. abyssi Boeck 1871 H.a.-+- H. grandicornis ($), A. Boeck in: Forh. Selsk. Christian., 1870 p.152, 153 | 1876 H. a., A. Boeck, Skand. Arkt. Amphip., v.2 p-488 t.10 f.2 | 1893 H.a., G.O. Sars, Crust. Norway, v.1 p.412 t.145 f.2 | 1893 H. a., A. Della Valle in: F. Fl. Neapel, v.20 p. 661 t.59 f. 69—71. Body moderately slender, peraeon in O much longer than in JS, pleon segments +and 5 produced to a dorsal acute subdeflexed tooth, larger in segment 5. Head, rostrum nearly reaching middle of 1° joint of antenna 1, lateral corners somewhat produced, narrowly rounded. Side-plate 1, front corners acutely - produced, 5t" more than twice as broad as deep, front lobe scarcely produced. Pleon segment 3, postero-lateral corners subquadrate. Eyes not represented by any trace of pigment. Antenna 1 in Q, 1° joint nearly twice as long as 22 and 34 combined, flagellum scarcely thrice as long as pedunele, 1° joint as long as the next 8 combined; accessory flagellum nearly as long as peduncle, with 3 joints, 1% much the longest. Antenna 2 little longer, ultimate joint of pedunele shorter than penultimate, flagellum subequal to the peduncle. In CS antennae 1 and 2 nearly twice as long as in O9. Antenna 1, 1° joint of flagellum extremely large, dense with sensory setae, about as long as laminar accessory flagellum. Gnathopods 1 and 2, 5t" joint little expanded distally, densely setose, 6! joint much longer, rather narrow, hind margin densely setose, finger slender, smooth, a little curved. Peraeopods 1 and 2 scarcely longer than gnathopod 2, 4 joint rather shorter than 5th, Peraeo- pods 3—5 long, slender; in peraeopod 3, 24 joint rather small and narrow, ‚in 4 and 5tk successively larger, 4th joint considerably longer than 5tk or 6th, finger short. Uropod 3, outer ramus rather longer than inner. Telson more than twice as long as broad, tapering, cleft nearly to base, apices bidentate. Colour pellueid with faint yellowish tinge. L. © 8, d 9 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (whole Norway). Depth 188—752 m. 18. Fam. Liljeborgiidae 1899 Liljeborgüidae, T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.211. Pleon with one or more of the segments dorsally dentate. Head, rostrum seldom large. Side-plate 1 produced forward, 4!" emarginate behind. Antenna 1 usually shorter than antenna 2, accessory flagellum well developed. Upper lip slightly or not bilobed. Lower lip without-inner lobes. Mandible, molar feeble. Maxillipeds, inner and outer plates rather small, palp elongate, Gnathopods 1 and 2 strong, subchelate, gnathopod 2 the larger, often with sexual variation. Peraeopods 1 and 2 very slender. Peraeopods 3--5, 24 joint expanded, 5th pair the longest. Uropod 3, rami subequal in length. Telson cleft. Marine. 2 genera, 10 accepted species and 2 doubtful. Synopsis of genera: Gnathopods 1 and 2, 5th joint produced into a narrow lobe 1. Gen. Liljeborgia p. 230 Gnathopods 1 and 2, 5th joint little or not at all produced 2. Gen. Idunella . p. 234 N a ee F = + 230 Liljeborgia 1. Gen. Liljeborgia Bate 1861 Iduna (non Keyserling & H. Blasius 1840, Aves!), A, Boeck in: Forh. Skand. Naturf., Mode 8 p.656 | 1862 Liljeborgia (part.). Bate (& Westwood), Brit. sess. Crust., v.1 p.202 | 1862 L., Bate, Cat. Amphip. Brit. Mus, p.118 | 1876 L., A. Boeck, Skand. Arkt. Amphip., v.2 p.496 | 1888 L., T. Stebbing in: Rep. Voy. Challenger, v.29 p- 980 | 1871 Lilljeborgia, A. Boeck in: Forh. Selsk. Christian., 1870 p.154 | 1894 L., G. ©. Sars, Orust. Norway, v.1 p.529 | 1865 Microplax (non Fieber 1861, Hemiptera!), W. Lilljeborg in: N. Acta Soe. Upsal., ser.3 v.6 nr.1 p.19. Pleon segment 4 dorsally dentate. Antenna 1 the shorter, accessory flagellum strongly developed. Mandible, cutting edge dentate, accessory plate on- both mandibles, spines of spine-row short, palp slender, with less difference in length than usual between the joints. Maxilla 1, inner plate small, with 1 or 2 setae, outer plate with 10 spines, palp large. Maxilla 2, inner plate the wider. Maxillipeds, outer plates narrow, reaching little beyond 1° joint of elongate palp. Gnathopods 1 and 2, 5 joint produced into a considerable lobe, 6% joint large, oval, finger long, more or less serrate on inner margin. Uropod 3, rami 1-jointed. 8 species accepted, 2 doubtf£ul. | Synopsis of accepted species: Pleon segments 1 and 2 each with a single dorsal tooth — 2. Pleon segments 1 and 2 each with. more than 1 dorsal tooth — 6. Pleon segment 3 without dorsal tooth; telson celeft nearly to base — 3. Pleon segment 3 with dorsal tooth; telson not cleft nearly to base — 5. J 1 2 Pleon segment 3, postero-lateral angles upturned 1. L. pallida . . . . p.250 ® Pleon segment 5, postero-lateral angles not upturned —4. Eyes eonspieuous; peraeopods 4 and 5, finger less than half as long as 6th joint . ...... 2. L. brevicornis . . p. 251 Eyes ineonspieuous; peraeopods 4 and 5, finger more than half as long as 6th joint ...... 3. I. maceronyx. . . p.231 4 Peraeopods 3—5, 24 joint narrowly oblong. . . 4. L. fissicornis - . p.231 \ \ Peraeopods 3—5, 24 joint broadly ovate. . . . 5. L. consanguinea . p.232 f Pleon segments 1 and 2 quinquedentate .... 6.L. dubla. 0% p- 233 \ Pleon segments 1 and 2 tridentate — 7. Pleon segment 3 not dentate, segment 4 unidentate 7. L. kinahani . . . p.233 Pleon segment 3 unidentate, segment 4 bidentate 8. L. dellavallei . . p.234 1. L. pallida (Bate) 1856 Gammarus? pallidus (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.55 | 1857 @.?p., Bate in: Ann. nat. Hist., ser.2 v.19 p.145 | 1862 Liljeborgia pallida (part.), Bate & Westwood, Brit. sess. Crust., v. 1 p. 203 f. | 1862 L.p., Bate, Cat. Amphip. Brit. Mus., p. 118 t.20 £. 5. In many respects agreeing with L. brevicornis; but: Pleon segment 3, postero-lateral angles acutely toothed, with a distinet sinus above the upturned point. Antenna 2, flagellum shorter than ultimate joint of pedunele (a character probably variable and less important). Uropod 3, rami much shorter than peduncle. Colour in life very white, back stained with a rich erimson blotch, gnathopods 1 and 2 with a rosy hue on 6% joint, and the same tint on parts of the peraeopods. L. 5 mm. Plymouth Sound; off Torquay. og RE Ar Se 2 TE Dr EU Hehe ST ar Liljeborgia 231 2. L. brevicornis (Bruz.) 1859 Gammarus b., R.M. Bruzelius in: Svenska Ak. Handl., n. ser.v.3 nr.1 p.62 t.3 f. 11a—o | 1861 @. b., Iduna (part.), A. Boeck in: Forh. Skand. Naturf., Mode8 p.657 | 1862 Liljeborgia pallida (part.) (err., non Gam- marus pallidus Bate 1857!), Bate & Westwood, Brit. sess. Crust., v.1,p.205 | 1871 Lilljeborgia p., A. Boeck in: Forh. Selsk. Christian., 1870 p.155 | 1876 L.p., A. Boeck, Skand. Arkt. Amphip., v.2 p.497 t.18 f.9 | ?1889 L.p., A.M. Norman in: Ann. nat. Hist., ser.6 v.4 p.116 t.10 £.10 | 1894 L.p., G.O. Sars, Crust. Norway, v.1 p.580 t. 187. Pleon segments 1, 2 and 4 (Sars) (Bruzelius and Boeck: segments 1—5) each produced to a small dorsal tooth. Head, rostrum distinet but short, lateral corners projeeting, obliquely rounded. Side-plate 1 distally expanded, 15 —34 with small tooth at lower hind corner. Pleon segment 3, postero-lateral angles acute, lateral margin straight. Eyes large, oval quadrangular, very dark. _ — Antenna 1, 1° joint nearly twice as long as 2 and 34 combined, 34 very small, = — _flagellum nearly twice as long as peduncle, about 20-jointed, accessory pedunele "more than ?/, as long as primary, 13-jointed. Antenna 2 about ?/, longer, ultimate = joint of peduncle rather longer than penultimate, flagellum longer than ultimate = joint of pedunele. Gnathopod 1, 4% joint apically acute, 5" produced to a narrow setose lobe, 6!" large, ovate, palm curved, oblique, spinulose and setulose, defined from the shorter hind margin by an angle and spines, finger curved, with 6 strong teeth in proximal half. Gmathopod 2 similar, but larger, E and larger in 9 than in O, palm longer and more oblique, finger serrate almost throughout, with about 12 teeth. Peraeopods 1 and 2, 5* joint | much shorter than 6*%, finger about !/, length of 6th. Peraeopods 3—5, 24 joint oval, serrate behind. Peraeopod 5, 6" joint rather longer than 5%, tapering, with fascicles of setae on hind margin, finger about '/, as long, stiliform. Uropod 3, rami longer than peduncle, lanceolate, subequal in length, but inner much broader than outer, with 3 or 4 spinules on inner margin. Telson nearly twice as long as broad, cleft nearly to base, apices a little dehiscent, bidentate, outer point more produced than inner, a long spine in each notch. Colour pale orange. L. © 8, © nearly 10 mm. Aretie Ocean, North-Atlantic, North-Sea and Skagerrak (whole Norway, depth 75—564 m; Bohuslän; Seotland; France). 3. L. macronyx (0. Sars) 1894 Lilljeborgia m., G.O. Sars, Crust. Norway, v.1 p.588 t. 188 f.2. 2 Body slender, pleon segments 1, 2 and 4 each produced to a small dorsal - . tooth. Head, rostral projeetion well marked, lateral corners slightly produced, obtusely acuminate. Pleon segment 3, postero-lateral corners almost quadrate, produced to a very small tooth. Eyes inconspicuous in spirit. Antenna 1, flagellum nearly twice as long as pedunele, about 12-jointed, accessory flagellum more than half as long, 8-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum less than both combined. Gnathopods 1 and 2 nearly as in L. brevicornis, but finger in gnathopod 1 with-only 3 teeth at base, and in gnathopod 2 with 7 on proximal half. Peraeopods 1 and 2, finger half as F: long as 6tk joint. Peraeopods 3—5, 2 joint large and laminar. Peraeopod 5 very E. long, 6% joint smooth, finger nearly as long. Uropod 3, both rami rather - — narrow, inner the wider, with 3 small spinules on inner margin. Telson 5 very narrow, nearly thrice as long as broad, cleft nearly to base, apices minutely bidentate, with spinule in each notch. L. © 6 mm. Christianiafjord and Trondhjemsfjord. Depth 376-752 m. 4. L. fissicornis (Sars) 1858 Gammarus f., M. Sars in: Forh. Selsk. Christian., p- 147 | 1861 @. f., Iduna f., A. Boeck in: Forh. Skand. Naturf.,, Mode 8 p. 657 | # 232 Liljeborgia 1871 Lilljeborgia f., A. Boeck in: Forh. Selsk. Christian., 1870 p. 155 | 1876 L. f., A. Boeck, Skand. Arkt. Amphip., v.2 p.499 t.18 f.10 | 1889 L. f,, A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.118 t.10 £.11 } 1894 L. f., G. O. Sars, Crust. Norway, v.1 p- 534 t.189 |.1866 Gammarus pallidus (ert., non Bate 1857!), Goes in: Öfv. Ak. Förh., v.22 p.529 t.40 f.27 | 1893 Nieippe pallida (part.), A. Della Valle in: F, Fl. Neapel, v.20 p. 658, Body rather slender, pleon segments 1—5 each produced into a dorsal tooth, segments 4 and 5 carinate and the tooth on each large, especially that on segment 4. Head, rostrum small, lateral corners subangular. Side-plate 1 much expanded distally. Pleon segment 3, postero-lateral corners produced to a small tooth. Eyes wholly wanting. Antennal, flagellum nearly twice as long as peduncle, 18—20-jointed, accessory flagellum more than half as long, 10—12-jointed. Antenna 2 longer by almost the whole flagellum. Gnathopods 1 and 2 in 9 , palm curved, oblique, defined by a projeeting angle and strong palmar spines, finger in gnathopod 1 with 4 teeth at base, in gnathopod 2 with about 9 covering the proximal ?/, of margin. Gmnathopod 1 ind asin O, but gnatho- pod 2 with 6! joint very large, dilated at base, then tapering, palm long, straight or slightly concave, finely eiliated, finger very large, greatly curved, without teeth. Peraeopods 3—5, 24 joint narrowly oblong, 4! pair much longer than 34, and 5!" than 4%, In peraeopod 5, 6!" joint with small setae on both margins, finger rather short. Uropod 3, rami equal in length, inner the broader, with 3 spines on inner margin. Telson longer in J than in ©, cleft not much beyond the middle, apices contiguous at the inner points, the outer considerably more produced, a long spine in each notch. Colour uniformly yellow. L. © 10, & 11 mm, but arctie specimens reaching 20 mm. Aretie Ocean and North-Atlantic (Greenland, Spitzbergen, Trondhjemsfjord, Finmark); Skagerrak (Bohuslän). Depth 94-376 m. 5. L. consanguinea Stebb. 1888 L.c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.980 t.91 | 1893 Nieippe pallida (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.658. Pleon segments 1—5 carinate, each produced to a small but pronounced dorsal tooth. Head, rostrum small, well marked, lateral corners narrowly obtuse. . Side-plate 1 broadly produced forward, 1%—34 with a denticle at the front and hind corners, 4 with the hind margin below the excavation straight, serrate into 4 teeth. Pleon segments 1—3, postero-lateral corners acute, in segment 3 slightly upturned with small sinus above. ‚Eyes doubtful. Antenna 1, 24 joint fully half as long as 1%, flagellum rather longer than peduncle, 13-jointed, accessory flagellum more than half as long, 8- or 9-jointed. Antenna 2 not much longer than antenna 1, ultimate joint of peduncle rather longer than penultimate, flagellum shorter than both combined, 13-jointed. Upper lip very slightly bilobed. Mandible, accessory plate strongly dentate on left, feebly denticulate on right, spine-row of 6 spines, molar almost evanescent, represented by a row of spines, 24 joint of palp a little longer than 1°, 1% than 34. Maxilla 1, inner plate with 2 setae instead of 1 as in the European species, outer plate with 10 spines. Gnathopods 1 and 2 in go asin L. fissicornis (p. 231), but 4" joint of gnathopod 1 distally rounded (?). Peraeo- pods 3—5 distinguished from those of L. fissicornis by the broadly oval 24 joint, which also in peraeopod 5 has the hind margin very convex. Uropod 3, rami rather longer than peduncle, inner little broader and rather shorter than outer, with 2 spinules on the inner margin. Telson as in L. fissicornis. L. 9 11 mm. Southern Indian Ocean (Kerguelen Island, depth 36 m; Heard Island, depth 187 m). Liljeborgia 233 6. L. dubia (Hasw.) 1880 Eusirus dubius, Haswell in: P. Linn. Soc. N.S.Wales, v.& p.331 t.20 f.3 | 1885 E. affinis, Haswell in: P. Linn. Soc. N.S.Wales, v.10 p. 101 t.14 f. 2—4 | 1888 Liljeborgia haswelli, T. Stebbing in: Rep. Voy. Challenger, v. 29 p-985 t.92 | 1893 Nieippe h., A. Della Valle in: F. Fl. Neapel, v.20 p. 661 t.59 f. 68. Pleon segments 1—5 dorsally dentate, 1% and 29 having 5 teeth each, 34 a very minute tooth- between two rounded lobes, 4" and 5tR carinate each with a strong tooth; peraeon segments 6 and 7 with a dorsal tooth(?). Head, rostrum very distinet, narrow, acute, lateral corners broadly rounded. Side-plates 1—3 with very small denticles at the corners, 4" with 2 teeth on the hind margin. Pleon segments 2 and 3, postero-lateral eorners acute, very slightly produced. Eyes oval, not large, remaining dark in spirit. Antenna 1, 15 joint fully twice as long as 24 and 34 combined, flagellum much longer than pedunele, 34-jointed, accessory flagellum more than half as long, 18-jointed. Antenna 2 considerably longer, penultimate joint of pedunele long, but shorter than ultimate, flagellum shorter than both combined, 24-jointed. Maxilla 1, inner plate with, 1 seta. Gnathopods 1 and 2 in Q nearly as in L. consanguinea, but 6!" joint more broadly oval. In the J gnathopod 2 has the palm of 6 joint well defined, but rather concave than convex, the joint distally narrowed, with the palm produced into a blunt tooth, strong but variable in length, with a cavity between it and the lobe adjoining the hinge of the finger; inner margin of the finger somewhat convex at the middle, cut into teeth. Peraeopods 1-5, finger short. Peraeopods 3—5, 24 joint rather broad, hind margin not very convex, strongly 'serrate. Uropod 3, rami lanceolate, inner rather the broader and longer, with 4 spines on the inner margin. Telson long and narrow, cleft nearly to the base, outer point of bidentate apices produced much beyond the inner, a long spine in each notch. Colour in spirit showing a lustrous green on many parts. L. 15 mm, but often much smaller. Bass Strait and South-Paeifie (Tasmania; Port Jackson, Port Stephens and Jervis Bay [East-Australia]; East Moneoeur Island, depth 69 m). 7. L. kinahani (Bate) 1862 Phaedra k., Bate (& Westwood), Brit. sess. Crust., e.1 p.211 f. | 1862 P.k., Bate, Cat. Amphip. Brit. Mus., p.119 t.21 f.1 | 1876 Liljeborgia k., A. Boeck, Skand. Arkt. Amphip., v.2 p.497 | 1888 Lilljeborgia k., Chevreux in: C.-R. Ass. Franc., Sess. 16 v.2 p.666 | 1894 L. k., G.O. Sars, Crust. Norway. v.1 p. 532 t.188 f. 1. Body very short and stout. Pleon segments 1, 2, 4 and 5 each produced into a well marked dorsal tooth, this in segments 1 and 2 (Sars) accompanied by a smaller tooth on each side. Peraeon segments 5—7 and(?) pleon segment 3 dorsally dentate (Bate). Head, rostrum distinct, lateral cormers obtusely acuminate. Side-plate 1 broader than 24 or 34, but scarcely expanded distally, Pleon segment 3, postero-lateral corners acute, slightly upturned, with very small sinus above. Eyes small, round, black. Antenna 1 short, flagellum not nearly twice as long as peduncle, 12-jointed, accessory flagellum more than half as long, 7-jointed. Antenna 2, ultimate joint of pedunele scarcely longer than penultimate. Gnathopod 1 as in L. brevicornis (p. 231), but 24 joint abruptly dilated near base, finger with only 3 teeth at base. Gmnathopod 2, finger with 6 teeth on proximal half. Peraeopod 5, 6" joint setose on outer margin, finger about half as long, very slender. Uropod 3, outer ramus quite unarmed, inner with a single spinule on inner margin. Telson ° cleft nearly to base, lobes divergent, a long spine in the notch of each apex, the points of the apices level. Colour whitish, pellueid (Sars), in front tinted with violet, behind rosy white (Chevreux). L. 3 mm. North-Atlantie and North-Sea (Norway, depth 11--19 m; France; Great Britain). ET EEE EEE IT TE ER 4 an a REN ’ vr £ IR Igea ch Te j , 234 Liljeborgia, ldunella 8. L. dellavallei Stebb.*) 1893 Nieippe pallida (part.) (err., non Gammarus pallidus Bate 1857!), A. Della Valle in: F. Fl. Neapel, 0.20 p.658 t.1$.1; t.19 £.35—52. Rather robust. Pleon segments 1 and 2 each produced into 3 dorsal teeth, 3 and 5 each into 1 tooth, segment 4 into 2 teeth. Head, rostrum small, acute, slightly deflexed, lateral corners rounded. Side-plate 1 distally expanded, corners rounded. Pleon segments 2 and 3, postero-lateral angles acute, upturned, with a small sinus above. Eyes white, in Q rather small, rounded oblong, in C larger, irregular, approximating above. Antenna 1, 1° joint longer than 24 and 34 combined, flagellum twice as long as peduncle, with about 20 short joints, accessory flagellum with more than 12 joints. Antenna 2, ultimate joint of pedunele longer than penultimate, rather shorter than 15-jointed flagellum. Gnathopod 1, finger with 7 teeth on proximal half. Gnathopod 2, 11 teeth covering about */, length of inner margin of finger. Peraeopods 3—5, 24 joint oval, broadly so in peraeopod 5, hind margin strongly serrate, finger small and delicate. Uropod 3, rami broadly lanceolate, little longer than peduncle, Telson cleft about */, of the length, each apex seemingly evenly bidentate. Colour variable, sometimes uniformly grey, sometimes wine-red to peraeon segment 6, then yellowish grey. L. 5—6 mm. Gulf of Naples. L. bispinosa (A. Costa) 1857 Gammarus bispinosus, A. Costa in: Mem. Ace. Napoli, v.1 p.223 t.3 f.9 | 1876 Liljeborgia b., A. Boeck, Skand. Arkt. Amphip., v.2 p- 497 ,.?1893 Gammarus locusta- (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 660. L. 5 mm. Gulf of Naples. L. pugettensis (Dana) 1853 & 55 Gammarus p., J. D. Dana in: U.S. expl. Exp., v. 1311 p. 957; t.66 f.la—g | 1876 @. pugetensis, Cheirocratus (part.), A. Boeck, Skand. Arkt. Amphip:, v.2 p.395 | 1894 @. p., (©. (part.), G. O. Sars in: Crust. Norway, v.1 p.523 | 1893 @. locusta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.760. Third joint of palp of mandible seems to be longer than in other species of Liljeborgia. L. 18 mm. Puget Sound [Western North-America]. 2. Gen. Idunella O. Sars 1894 Idunella (Sp. un.: I, aegvicornis), G. O. Sars, Crust. Norway, v.1 p.586 | 1896 Idurella, Pocock in: Zool. Ree., v.32 Crust. p. 41. Head, rostrum not large. Accessory flagellum of antenna 1 not very large. Mouth-parts probably agreeing nearly with those of Liljeborgia (p. 230). Gnathopods 1 and 2, 5" joint not or very slightly produced. 2 species. Synopsis of species: ; Pleon with only 1 segment dorsally dentate . ...... 1. I aequicornis . p. 234 Pleon with 4 segments dorsally dentate .. . 2... 2. Lpicta. . . .. p.235 1. I. aequicornis (©. Sars) 1876 Lilljeborgia aeqvicornis, G. O. Sars in: Arch. Naturv. Kristian., 0.2 p.255 | 1894 Idunella a., G. O. Sars, Crust. Norway, v.1 p.537 t. 190. Rather slender. Pleon segment 2 produced to a small dorsal tooth. Head, rostrum small, lateral corners narrowly rounded. Side-plate 1 much bxpanded, *) Sp. nov. After Antonio Della Valle. Idunella, Oedicerotidae 235 broadly rounded in front, 1°°—34 with denticle at lower hind corner, 4'k large, quadrate, emarginate above. Pleon segment 3, postero-lateral corners acutely upturned, a small sinus between the point and the bulging hind margin. Eyes represented by small ovoid patches of whitish pigment. Antenna 1, 1° joint scarcely longer than 22and 34 combined, flagellum subequal to the peduncle, about 12-jointed, accessory flagellum not half as long, slender, 5-jointed. Antenna 2 scarcely as long as antenna 1, ultimate joint of pedunele a little shorter than - penultimate, flagellum shorter than the 2 combined. Mandibular palp more fully developed than in Liljeborgia, 34 joint long and faleiform. Maxillipeds, palp smaller than in Liljeborgia. Gnathopod 1 in Oo, 24 joint somewhat fusiform, 5th very slightly produced, 6% very large, gradually widened distally, palm nearly transverse, slightly convex, defined by a distinet angle and 2 unequal spines, finger slender and curved. Gmathopod 2 in O similar, but with 6%: joint a little smaller. Gmathopod 1 in C very large, 6'" joint longer, than joints 2—5 combined, palm long, concave, very oblique, defined by an acute tooth, the joint greatly narrowed towards tbe hinge near which the palm ends in a small denticle, finger long; slender, greatly curved. Gnathopod 2 in C as in ©, much smaller than gnathopod 1. Peraeopods 1 and 2 very slender. Peraeopods 3—5, 24 joint expanded, oval, peraeopod 5 the longest, its 6% joint a little longer than 5", sparingly setose, finger rather shorter and thin. Uropod 3, rami subequal, inner lanceolate, outer much narrower, 2-jointed, 22 joint spiniform. Telson about twice as long as broad, little tapering, cleft nearly ?/, length, inner point of bidentate apices the longer, each with 2 spines in the notch. Colour uniformly pale yellow. L. scarcely 7 mm. Arctic Ocean (Varangerfjord, depth 94—188 m; Storeggen; Jan Mayen; Barents Sea). 2. I. pieta (Norm.) 1889 Lilljeborgia p., A. M. Norman in: Ann. nat. Hist., ser.6 ©4 p.116 t. 10 £.5—9. Pleon segments1,2,4and 5 produced each ala dureal oh: Head, rostrum small, lateral corners scarcely produced. Eyes (in fig.) oval, dark. Antenna 1 shorter than pedunele of antenna 2, flagellum with about 7 joints, accessory flagellum with only 3, the last very minute. Antenna 2, ultimate joint of peduncle ?/, aslong as penultimate, flagellum a little longer than ultimate, 8-jointed. Mouth- parts not deseribed. Gnathopod 1, 5tk joint not produced, 6!" widening gradually from base, palm oblique, well arched, searcely more than '/, of total length of joint. Gnathopod 2, 5tk joint not produced, 6!" ovate, greatest width at commencement of palm, which is slightly defined, a little longer than hind margin. Peraeopods 1 and 2, finger little more than '/, length of 6% joint. Peraeopod 5, 6% joint slightly longer than 5%, finger scarcely more than !/, as long. Uropod 3, rami very broad and foliaceous. Colour pale with markings of deep pur ple, a spot on ultimate joint of pedunele in antennae 1 and 2, the purple suffused over part of head, and most of peräeon, but on peraeopods and the other parts in spots and blotches. L. 6 mm. English Channel (Guernsey). 19. Fam. Oedicerotidae - 1865 Subfam. Oedicerina, W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 0.6 nr.1 p-18 | 1871 Subfam. Oedicerinae, A. Boeck in: Forh. Selsk. Christian., 1870 p.160 | 1883 Oediceridae, J.S. Schneider in: Tromse Mus. Aarsh., 0,6 (p.1) | 1888 O., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 835 | 1892 O., G. O. Sars, Crust. Norway. v.1 p.286 | 1893 Oediceridi, A. Della Valle in: F. Fl. Neapel, v.20 p.531. EEE ES ze TE a a Aa ee Lehe 5 DT Re ee ce DE A BEE a a ee Te Fe u Te EN Sega En er at ” & TE u“ a Sn BES ER E > a 236 Oedicerotidae Side-plates of moderate size, fringed with setae. Pleon segments 1—3, postero-lateral corners usually rounded. Eyes (Fig. 61, 62), when present and distinctly developed, usually contiguous, approximate or wholly confluent, dorsal and more or less frontal. Antenna 1 (Fig. 61, 67) with accessory flagellum absent or rudimentary. Epistome not projeeting. Upper lip not bilobed. Lower lip with inner lobes separate or coalesced. Mandible, molar variable, palp usually large. Maxillipeds, plates well developed, but seldom large. Gnathopod 1 (Fig. 65) subchelate. Gnathopod 2 (Fig. 66) subchelate or rarely chelate. Peraeopods 1—4 (Fig. 63), 4" joint moderately large. Peraeopods 3 and 4, 24 joint elliptie, fringed with plumose setae. Peraeopod 5 (Fig. 64) very long, 24 joint expanded, 7 stiliform. Branchial vesieles usually simple, large. Uropods 1—3 commonly extending equally far back. Telson small, entire. Marine; many species are known as sand-burrowers. 18 genera, 56 accepted species and 6 doubtf£ul. Synopsis of genera: line of demarcation — 2. Eyes not completely confluent — 3. f Eyes (Fig. 61) not prominent .. . . . 1. Gen. Perioculodes . . .'p. 237 \ Eyes (Fig. 62) prominent . ...... 2. Gen. Gulbarentsia . . . p. 238 ® not contiguous, though distinetly | Eyes completely eonfluent, without median : | 2 BOVolDDen Tin Ha RT, 3. Gen. Exoediceros . . . p.2839 Eyes, when distinetly developed, conti- guous or approximate — 4. A Gnathopod 2 chelate — 5. Gnathopod 2 (Fig. 66) subehelate — 6. 5 f Mandible, molar normal... ..... 4. Gen. Pontocrates. . . . p.239 \ Mandible, molar degraded. .. ... . 5. Gen. Synchelidium - . . p. 241 3 Mandible, molar without triturating sur- 6 face — T. H Mandible, molar with triturating surface — 8. Gnathopods 1 and 2 alike in structure . 6. Gen. Oediceros. . . . . p. 243 Gnathopods 1 and 2 unlike in structure 7. Gen. Paroediceros . . . p.245 Uropod 3 much longer than uropods land2 8. Gen. Haliereion . . . . p.247 Uropod 3not longer than uropods 1 and 2 — 9. Mandible, 2d joint strongly curved — 10. Mandible, 2djoint not strongly curved —12. Front of the head not produced .. .. 9. Gen. Arrhis ...... p: 248 Front of the head produced — 11. 2 1 | Gnathopods 1 and 2, palm very oblique 10. Gen. Westwoodilla. . . p.249 9 fa oO Gnathopods 1 and 2, palm nearly transverse 11. Gen. Carolobatea. . . . p.252 Front of the head not produced . . . . 12. Gen. Oediceropsis . . . p.252 Front of the head (Fig. 67) produced — 18. Back'multicarinste ; 2.222... 2..2.0..% 13. Gen. Acanthostepheia . p.253 Back not multicarinate — 14. 12 13 Eyes (Fig. 67) wanting or not placed on rostral projection — 15. Eyes or ocular pigment on rostral pro- jeetion — 16. Peraeopods 1 and 2 (Fig. 63) with widened Sinbectiu Auen, 1, NIS hah shi 14. Gen. Aceroides. . -. - - p. 254 Peraeopods 1 and 2 without widened joints 15. Gen. Bathymedon . . . p.255 14 15 re ee DE NER Ten ’ . Eher er Oedieerotidae, Perioeulodes 237 16 Antenna 1 longer than antenna 2 . . . 16. Gen. Monoeculopsis . . . p.257 Antenna 1 not longer than antenna 2 — 17. j ; Blonde EN gene 17. Gen. Monoculodes . . . p.258 Gnathopod 2 (Fig. 66), process of 5th joint 17 | enden 2, process of 5th joint broad 18. Gen. Oediceroides . . . pP. 267 4. Gen. Perioculodes 0. Sars 1892 Perioculodes (Sp. un.: P. longimanus), G.O.Sars, Crust. Norway, v.1 p.312| 1895 P., A. M. Norman in: Ann. nat. Hist., ser. 6 v.15 p. 486. Side-plates moderately deep. Rostral projection short, deflexed. A single ‘eye (Fig. 61) encircling front of head, lenses highly refractive. Antenna 1 in O rather longer than antenna 2, 1%, 24 and 34 joints subequal, in J (Fig. 61) 24 shorter than 1°, 34 than 24, - — flagellum stronger than inQ. Antenna 2in J (Fig. 61), flagellum long, filiform. Upper lip broadly truncate. E: Lower lip, inner lobes coalesced. Mandible not strong, molar feeble, conical, tipped with 3 spinules, palp in © rather small, 34 jointshort; in J larger. Maxillae land 2 nearly as in Monoculodes (p. 258). Maxillipeds, inner plates small, outer nearly reaching apex of 24 joint of - palp, armed with spaced spines. Gnathopods 1 and 2, = process of 5t" joint very long, stiliform, adjacent to "> 18 joint x = 34 joint \ and overtopping hind margin of the narrow 6*% joint, Fig. 61. which is long with short palm. Peraeopods 1—5 F.longimanus, 3. = Head and antennae. and uropods 1—3 nearly as in Monoculodes. Telson Tafter G. 0. Sars.] oblong, apically rounded. 1 species accepted, 2 doubtful. 1. P. longimanus (Bate & Westw.) 1868 Monoculodes l., Bate & Westwood, Brit. sess. Crust., v.2 p.507 | 1892 Perioculodes l., &. O. Sars, Crust. Norway, v.1 p.313 t.110 £.2; t.111 £.1| 1895 P. 1, A. M. Norman in: Ann. nat. Hist., ser. 6 v.15 p.486 | 1893 Oediceros l. (part.). A. Della Valle in: F. Fl. Neapel, v.20 p.547 t.4 f.9; t.33 2.32 —36 | 1871 Monoculodes grubei, A. Boeck in: Forh. Selsk. Christian., 1870 p. 165 | 1888 M. aequimanus (err., non Oedicerus a. Kossmann 1880!), (A. M. Norman in MS.) F: D. Robertson in: P. nat. Hist. Soc. Glasgow, n. ser. v.2 p.30. = Head, rostral projection short, broad, triangular, lateral corners rounded. 2 Side-platel rather expanded and obliquely truncate, 24 and 3% oblong, with small tooth at lower hind corner, 4" very large, lower hind corner a little produced, obtuse, 5!" broader, less deep. Eyes broadest at top, bright scarlet with about 12 brilliantly iridescent lenses on each side. Antenna 1 in 9, flagellum little over half length of pedunele, with 6 joints, in J flagellum as long as pedunele, 1% joint - very large, densely clothed the sensory hairs not shown in Fig.61). Antenna 2 in Q, ultimate and penultimate joints of peduncle subequal, together as long as flagellum. Antenna 2 in J twice as long asinO©. Gnathopod 1, process of 5tt joint rather flexuous, nearly reaching end of 6%, which is about thrice as long as broad, palm nearly as long as hind margin. Gmnathopod 2, process of 5tk joint ® extending much beyond 6!" joint, which is 4 times (Sars) or about 5 times E (Norman) as long as broad, palm much shorter than hind margin. Peraeo- pods 1—4 moderately slender, densely setose, in 1° and 24 finger narrowly acuminate, not half length of broad 6** joint, in 34 and 4!" Janceolate, compressed. Peraeopod 5, 24 joint quadrangular oval, 5t" and 6 subequal, each longer In ve m b ae Ne RI ee Rue 2a rei I N a ah er a 238 Perioeulodes, Gulbarentsia than 4", Uropod 3, rami as long as peduncle, very narrow, unarmed. Telson nearly twice as long as broad, apex evenly rounded. Colour pale orange; ova in pouch dark bluish. L. 4 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, France, Great Britain); Kattegat; Mediterranean. Shallow water. P. aequimanus (Kossm.) 1880 Oedicerus a., Kossmann, Reise Roth. Meer., v.2ı Malacost. p.130 t.13 f.6—8 | 1893 Oediceros longimanus (part.), A. Della Valle in: F, Fl. Neapel, v.20 p. 547. Probably young 2 (doubtful marsupial plates on peraeopods 8—5). Red Sea. P. megapleon (Giles) 1888 Monoculodes m., G. M. Giles in: J. Asiat. Soc. Bengal, 0.57 p.235 t.7 f.12 | 1893 Oediceros longimanus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 547. Perhaps identical with P. longimanus (p. 237). L. 3'2 mm. Bay of Bengal (banks off Chittagong). Surface. 2. Gen. Gulbarentsia Stebb. 1894 Barentsia (Sp. un.: B. hoeki) (non T. Hincks 1880, Bryozoa!), Gulbarentsia, T. Stebbing in: Bijdr. Dierk., ©.17 p. 25, 2. Head without frontal process or rostrum (Fig. 62). Side-plates not large, 1° distally expanded, 4% not excavate behind. Eye single, prominent, forming a semicireular ring (Fig. 62). Antenna 1 shorter than antenna 2, flagellum in both many-jointed. Upper lip with rounded sides, distally narrowed. Lower lip, inner lobes small, distinet. Mandible normal, but molar small, palp elongate, 39 joint longer than 24. Maxilla 1, inner plate with 2 setae, outer with 7 spines, 24 joint of palp apically narrowed. Maxilla 2, plates subequal. Maxillipeds, inner plates small, outer reaching half way along the large and long 24 joint of palp, elosely fringed with slender spines. Gnathopods 1 and 2 similar, 5t" joint much shorter than 6th, with strongly projecting setose process, 6% long oval, the long spinose palm moderately defined. Peraeopods 1 and 2, finger much shorter than 6t% joint. Peraeopods 3 and 4, 24 joint little expanded, finger longer than 6!" joint, with a cap over the nail. 1 species. 1. G. hoeki Stebb. 1894 Barentsia h., Gulbarentsia, T. Stebbing in: Bijdr. Dierk., v.17 p.25 t.5. Head, front broadly convex, lateral angles acute, a dorsal carina behind the eye (Fig. 62). Peraeon segments 1—6 transversely ridged on front and hind margins, 5tk and 6!" with median carinate tooth and - postero-lateral angles acute. Side-plates partially serrate and spinulose, 5tt and 6 with hind angles of lobes acute. Eye large, collar-like, with many lenses, separated from front of head by a narrow groove. Antennae 1 and 2 little Fig. 62. G.hoeki. armed. Antenna 1 (18 mm), 1° joint twice as long as 24, Head, dorsal view. Aagellum nearly as long as peduncle, 36-jointed. Antenna 2 (25 mm), ultimate and penultimate joints of pedunele subequal, flagellum rather longer than peduncle, with 160 joints, many very short and broad. Gnathopod 2, side-plates apically narrowed, 24 and 6!" joints and lobe of 5" longer than in Gulbarentsia, ang Pontocrates 239 gnathopod 1, palm rather better defined in gnathopod 1. Peraeopods 1—4, 6" joint eurved, spinose on convex margin, the shorter 5th joint armed on the opposite margin. Specimen defective after peraeon segment 6. L.? Kara Sea (lat. 72° N., long. 65° E.). 3. Gen. Exoediceros Stebb. 1899 Exoediceros (Sp. typ.: Oedicerus fossor), T. Stebbing in: Ann, naf. Hist., ser. 7 v.4 p. 208. Distinguished from Oediceros (p. 243) by having the rostrum little pronounced, the eyes not contiguous though well developed, antenna 1 with rudiment of accessory flagellum, mandible with well developed molar and the palp’s 24 and 34 joints broad, maxilla 1 with numerous setae fringing the inner plate, maxillipeds with inner plates broad, gnathopods 1 and 2 with 5th joint at least as large as 6%, peraeopods 1 and 2 without finger, peraeo- pods 3 and 4 with minute upturned finger, uropod 2 not reaching so far back as uropod 1 or uropod 3 R 1 species. 1. E. fossor (Stimps.) 1855 Oedicerus f., Stimpson in: P. Ac. Philad., v.7 p.393 | 1899 O. f., Exoediceros sp. typ., T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.208 | 1880 E O. arenicola, O. f.?, Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.325 t.24 f.3 | 1893 ‚ Oediceros a., Halimedon sp.?, A. Della Valle in: F. Fl. Neapel, v.20 p. 556. Eyes small, rounded oval. Antenna 1, joints of peduncle successively a little shorter, flagellum attaining to about 24 distally widened joints carrying small calceoli, accessory flagellum a little blunt joint tipped with long setae. Antenna 2, flagellum as in antenna 1, at least in O0. Upper ___]ip rounded. Maxilla 2, with outer lobe the broader, inner with row of setae eurving from surface along i inner margin. Gnathopods 1 and 2 rather larger in Ö than in O (Haswell), 24 gnathopod larger than 1°, but similar, 5t"joint distally wide, setose, lobed, not produced along the oval 6%. Peraeopods 1—-4 have the 4b and 5th joints distally widened, 4" much longer than 5t", both strongly setose, 6!" narrow, with rows of setiform spines and spinules. Peraeopods 3—5 have the 2% joint oval, with numerous setae projecting from within the expansion. Peraeopod 5 elongate as in Oediceros. Uropods 1 and 2 with few spines on the slender subequal rami, which are much longer in the 1° than in the 24 pair. Uropod 3, rami equal, laminar, as long as peduncle, truncate apically, with numerous setae or spines. Telson at least as broad as long, narrowing slightly to broadly rounded apex, length less than peduncle of uropod 3 Colour white with a few blackish spots. L. 5—7'5 mm. Shark Island and Port Jackson [East-Australial. Burrowing in sand above high-water mark. _ 4. Gen. Pontocrates Boeck 1871 Pontocrates (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.171 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.307 | 1892 P., G. O. Sars, Orust. Norway, v.1 p.315. Head with short deflexed rostrum.- Side-plates 4 and 5 rather large. Eyes contiguous, at base of rostrum. Antenna 2 in Q much or little longer than antenna 1, in S elongate. Upper lip nearly quadrate. Lower lip, inner lobes separate from one another, but coalesced with outer lobes. Mandible normal. Maxilla 1, inner plate with 2 setae, outer with 9 spines. Maxillipeds, le LE ae a FE RE a N, or, 240 Pontocrates outer plates scarcely reaching beyond middle of large 24 joint of palp. Gnathopods 1 and 2 very dissimilar. Gnathopod 1, 5t% joint with short base and long process, 6! oval, palm well defined. Gnathopod 2, 5! joint with short base and processproduced beyond the chela which is formed between produced end of narrow 6#" joint and short finger (the process appears to be partially coalesced with the 6% joint, though less so than in Synchelidium (p. 241). Peraeopods 1—4 rather stout, densely setose, finger minute. Peraeopod 3 very short. Peraeopod 5, 24 joint broad oval, subequal in length to 4*h, 5th, 6th or 7, Uropod 3, rami narrow, longer than peduncle. Telson small. 3 species. Synopsis of species: j Antenna 2 in @ much longer than antenna 1... .. 1. P.altamarinus . p. 240 \ Antenna 2 in 2 little longer than antenna 1 — 2. Gnathopod 2, thumb of chela much broader than finger, process of ö5th joint little produced EEE EUER, 2. P. arceticus . . . p.240 Gnathopod 2, thumb of chela scarcely broader than finger, process of 5th joint much produced Boyd BMI ve ee Er 3. P. arenarius . . p.241 1 2 1. P.altamarinus (Bate & Westw.) 1862 Kroyera altamarina, Bate & Westwood, Brit. sess. Crust., ©. 1 p. 177 f. | 1893 Kröyera a., A. Della Valle in: F. Fl. Neapel, v. 20 p. 554 | 1895 Pontocrates altamarinus, G.O. Sars, Crust. Norway, v.1 p.695 t. vu f.2. » Moderately robust. Rostrum a little projesting, moderately deflexed. Side-plate 1 expanded and rounded distally, 24 and 34 slightly narrowed distally, 4% rather produced at lower hind corner. Eyes rather large, yellowish red. Antenna 1 much shorter than antenna 2 in both sexes, 24 joint fully as long as 1°, flagellum shorter than pedunele, 8-jointed. Antenna 2 in 9, ultimate joint of peduncle longer than penultimate, flagellum longer than peduncle. Gnathopod 1, process of 5!" joint not reaching much beyond hind margin of 6%, which is rather large, oval fusiform, palm obliquely eurved, much longer than hind margin, densely fringed with minute curved spinules. Gmathopod 2, process of 5% joint produced very little beyond chela, 6!" joint slightly tapering, thumb of chela little broader than finger, fringed as in palm of gnathopod 1. Peraeopods 1 and 2 moderately robust, 6" joint narrower than 5%, but subequal in length. Uropod 3, pedunele rather long, rami unarmed (Sars, but?). Telson oval, apex a little insinuate. Colour semipellucid, dorsally marbled with opaque light yellowish, antennae banded with orange; ova in pouch reddish brown. L. Q nearly 7 mm. North-Atlantie and North-Sea (Skudesnes, depth 38 m; France; British Isles). 2. P. arceticus O. Sars 1883 P. norvegieus (err., non Oedicerus n. A. Boeck 1861), J. S. Schneider in: 'Tromse Mus. Aarsh., v.6 p.17 t.2 f.15; t.3 f.21, 22 | 1889 P.n., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.193 t.9 f.8 | 1892 P.n., G. 0. Sars, Crust. Norway, v.1 p.315 t.111 f.2 | 1895 P. arcticus, G. ©. Sars, Crust. Norway, v.1 p. 698. | Rather stout, tumid in front. Rostrum short, much deflexed. Side- plate 1 with lower margin flattened, slightly insinuate, 29 rather narrowed distally, 39 not so, 4% rather produced at lower hind corner. Eyes rounded, light red with whitish coating. Antenna 1 in Q nearly as long as antenna 2, 24 joint shorter than 1°, flagellum nearly as long as peduncle, 8- or 9-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum in 9 a little, in C Fe I: iR hi: Fi Bi. BB; Bi Be; Pontocrates, Synchelidium 241 very greatly, longer than pedunele. Gnathopod 1, process of 5 joint reaching much beyond hind margin of 6'%, which is oval, constrieted at base, considerably expanded distally, palm obliquely eurved, somewhat longer than hind margin, edge smooth with row of minute curved spinules. Gnathopod 2, process of 5th joint produced very little beyond chela, 6% joint scarcely tapering, nearly 6 times (Sars) or 5 times (Schneider) as long as broad, thumb of chela much broader than finger. Peraeopods 1 and 2 rather stout, 6b joint shorter than 5th, finger extremely small. Uropod 3, peduncle rather long, rami each with 2 spinules. Telson rounded, apex obtusely truncate, beset with ‚8 spinules (Schneider). Colour yellowish, antero-dorsally tinged with orange. L. © 6 mm. Arctie Ocean (Finmark). Depth 11—19 m. 3. P. arenarius (Bate) 1858 Kroyera arenaria, Bate in: Nat. Hist. Northumb,, . ©.4ı p.15 t.2 f.1 | 1862 Kröyera a., Kroyea (laps.) a., Bate, Cat. Amphip. Brit. Mus., p-106 t.17 £.4 | 1893 Kröyera a., A. Della Valle in: F. Fl. Neapel, v.20 p. 554 | 1888 Pontocrates arenarius, T. Stebbing in: Rep. Voy. Challenger, v.29 p.307 | 1889 P. a., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.192 t.9 £.7,8 | 1861 Oedicerus nor- vegicus, A. Boeck in: Forh. Skand. Naturf., Mode 8 p.650, 652 | 1871 Pontocrates n., A. Boeck in: Forh. Selsk. Christian., 1870 p.171 | 1876 P.n. + P.n.var., A. Boeck, Skand. Arkt. Amphip., ©.2 p.288 t.16 f.4; t.15 £ 711895 P.n., @.0. Si Crost. Norway, v.1 p.693 t.vı £.2; t. vu £.l. Robust, segments dorsally sharply defined. Rostrum short, slightly curved. Side-plate 1 with distal part transversely truncate, 24 tapering to an obtuse point, 3% with oblique slightly insinuate distal margin, 4!" much deeper than the preceding, little produced at lower hind corner. Eyes rounded, light red with no whitish eoating. Antenna 1 in O not much shorter than antenna 2, 24 joint a little shorter than 1%, flagellum subequal to peduncele, with 9 joints, in C stouter, flagellum with 11 joints, first 6 or 7 densely hirsute. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum in © as long as peduncle, in G very much longer, filiform. Gnathopod 1, process of 5th joint reaching beyond 6%, which gradually widens distally, palm nearly transverse, not as long as hind margin, densely fringed with long stiff setae. Gmathopod 2 very slender, process of 5!" joint produced considerably beyond chela, 6% joint very narrow, thumb of chela little broader than finger. Peraeopods 1 and 2, 5t" joint broad, scarcely longer than 6, finger almost obsolete. Peraeopod 5, 24 joint oval quadrangular, with straight hind margin. Uropod 3, peduncle shorter than in the 2 preceding species, rami with a few spinules. Telson oval, apex evenly rounded. Colour semipellueid, whitish, slightly tinged with yellowish. L. © 6, C 6:5 mm. North-Sea (Skudesnes, depth 19 m; Dutch and British eoasts); Christianiafjord. 5. Gen. Synchelidium 0. Sars 1871 Pontocrates (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.171 | 1892 Synchelidium, G. ©. Sars, Crust. Norway, «.1 p. 317. Head with more or less strongly deflexed ee: Side-plate 1 distally expanded, with straight lower margin, 4% and 5t% rather large. Eyes eontiguous, at base of rostrum. Antenna 1 in O longer than antenna 2, 3% joint rather long. Antenna 2 in Ö very elongate. Mandible, molar small, conical, tipped with 1 spine, 34 joint of palp in © small. Maxilla 1 as in Pontocrates (p. 239). Maxilla 2, plates short, outer apically truncate. Maxillipeds, outer Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 16 242 Synchelidium plates with only a few strong spines. Gmathopod 1 powerful, nearly as in Pontoerates, but process of 5! joint tipped by a strong spine, palm coarsely dentate. Gnathopod 2, process of 5! joint coalesced with 6", except near the small chela, in which thumb and finger are both narrow. Other parts in agreement with Pontocrates. 4 species. Synopsis of species: 1 J Blotehed with brown — 2. \ Pellueid, without pigmentary ornament — 3. 9 Gnathopod 1, 6th joint broadly oval... ... 1. S. haplocheles . . p.242 Gnathopod 1, 6th joint elongate oval . ... . 2. 8. maculatum . . p.242 Rostrum much deflexed, lateral corners of head 3 | a RE a a EL 3. 8. tenuimanum . p.243 | Rostrum little deflexed, lateral corners of head a N ne 4. 8. intermedium . p.243 1. S. haplocheles (Grube) 1864 Kroyeria h., E. Grube, Lussin, p.72 | 1893 Kröyera h. (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p-553 t.3 f.15; t. 34 f. 3539 | 1868 Kroyera brevicarpa, Bate & Westwood, Brit. sess. Crust., v. 2 p. 508 f. | 1892 Synchelidium brevicarpum, G. O. Sars, Crust. Norway, v.1 p.318 t.112 £.1. Not robust, but back broadly rounded. Rostrum short, evenly curved, scarcely reaching beyond middle of 1° joint of antenna 1. Eyes rather large, rounded, bright red, with whitish eoating. Antenna 1 in O slender, 1°t and 24 joints subequal, 39 not much shorter, flagellum much shorter than peduncle, 5-jointed, in d 24 and 34 joints shorter and thicker, flagellum as long as peduncle, its 1° joint large, densely clothed. Antenna 2 in 9 shorter than antenna 1, ultimate and penultimate joints of peduncle subequal, together as long as flagellum. Gnatho- pod 1, process of 5t" joint a little dilated, then tapering, produced considerably beyond hind margin of 6%, which is wide at the middle, fusiform, palm much longer than hind margin, defined by an angular projecetion and strong spine, its edge denticulate, 6 of the denticles large and blunt (Sars, but scarcely so in Della Valle’s Fig... Gnathopod 2 rather slender, 6% joint thickened at base, thence tapering, chela about '/, of its length, a little overtopped by process of 5" joint. Peraeopods 1 and 2 moderately strong, 5th and 6th joints subequal, finger minute. Peraeopods 3 and 4, finger less insignificant. Peraeopod 5, 5! joint the longest. Uropod 3, rami very slightly longer than peduncle, slender, unarmed. Telson rather large, oblong oval, apex slightly insinuate. Colour whitish, variegated with dark brown, this forming transverse bands on some segments. L. 4—5'5 mm. North-Atlantie, North-Sea and Skagerrak (South- and West-Norway, Trondhjems- fjord, depth 19—56 m; Great Britain); Mediterranean. - 2. S. maculatum Stebb.*) 1893 Kröyera arenaria (err., non Kroyera a. Bate 1858!), A. Della Valle in: F. Fl. Neapel, v.20 p.554 t.4 f.1; t.34 f. 18-34. Slender. Eyesred. Antenna 1, 1° joint a little longer than 24, 24 than 3°, flagellum as long as 24 and 34 combined, with 4 rather elongate joints. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 6-jointed. Gnatho- pod 1, process of 5th joint reaching end of hind margin of 6, which is ellipsoidal, more than twice as long as broad, palm longer than hind margin, *) Sp. nov. ü $ Fi ö RE TIEENE Bee LE oh la Synehelidium, Oedideros 243 defined by a stout spine, divided into numerous little teeth, of which 5 interspersed are more conspicuous than the rest. Gnathopod 2, 24 joint distally constrieted, process of 5!" showing separation or suture at base, then eoalesced till near the chela, which it a little overtops, long 6t" joint rather wide at base, the narrow thumb fringed with minute dentiele and 4 larger hooked ones at apex, finger apically hooked. Telson subquadrate, not longer than broad. Colour reddish yellow, with large brown scars of various shapes on head and trunk, all the appendages pellueid, violet-grey. L. 4—5 mm. Mediterranean. 3. S. tenuimanum Norm. 1871 Pontocrates haplocheles (err., non Kroyeria h. E. Grube 1864!), A. Boeck in: Forh. Selsk. Christian., 1870 p.172 | 1876 P. h., A. Boeck, Skand. Arkt. Amphip., v.2 p.289 t.16 f.3 | 1892 Synchelidium h., G. O. Sars, Crust. Norway, v.1 p.319 t.112 f.2 | 1893 Kröyera h. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.553 | 1895 Synchelidium tenuwimanum, A. M. Norman in: Ann. nat. Hist., ser. 6 v.15 p..486. Moderately stout. Head strongly arched, rostrum vertically deflexed, acute, nearly reaching end of 1° joint of antenna 1; lateral corners angularlv produced. Eyes rather small, lenses few, bright red with chalky white coating. Antenna 1 in ©, 1° joint longer than 24, flagellum subequal to peduncle, 7-jointed. Antenna 2 in © shorter than antenna:1 ‚Hagellum subequal to pedunele. Gmathopod 1, 5!" joint as in S. haplocheles, 6th much expanded, oval triangular, palm divided into 7 or 8 coarse denticles. Gnathopod 2 extremely slender, 6 joint narrow at base, but much more so at the chela, which is scarcely more than !/, of its length, overtopped very slightly by a narrow point of the process of the 5tk joint. Peraeopods 1 and 2, 6! joint shorter than 5, finger minute. Peraeopod 5, 5tk and 6! joints subequal. Telson rather small, scarcely longer than broad, insinuate slightly at apex. Colour pellueid, whitish, not at all diversified; ova in pouch orange. L. O0 4 mm. North-Atlantie and North-Sea (Norway). Depth 94—564 m. 4. S.intermedium 0. Sars 1892 S.i., G. O. Sars, Crust. Norway, v.1 p. 320 113 £.1. Head, rostrum slightly deflexed, scarcely reaching beyond middle of 1° joint of antenna 1; lateral corners obtusely rounded. Side-plate 1 with lower front eorner more angular than in the 2 preceding species. Eyes rather small, lenses few, licht red with whitish coating. Antenna 1 in O, 24 joint fully as long as 1°, 34 rather long, flagellum much shorter than pedunele, 6-jointed. Antenna 2 in O much shorter than antenna 1, flagellum scarcely as long as pedunele. Gmathopod 1 nearly as in S. haplocheles, but process of 5! joint . less produced. Gnathopod 2 more slender than in S. haplocheles, but less elongate than in S. tenuimanum, chela about '/, as long as 6*k joint. Peraeo- pods 1 and 2, 5t" and 6% joints subequal, otherwise peraeopods 1—5 about asin S. tenuimanum. Telson oval, decidedly longer than broad, apically transverselv truncate. Colour pellueid, whitish, not diversified. L. © 4 mm. Trondhjemsfjord. Depth 282—750 m.- 6. Gen. Oediceros Kroyer 1842 Oediceros (Sp. un.: O. saginatus), Kreyer in: Naturh. Tidsskr., v.4 p. 155 | 1892 O., G. O. Sars, Crust. Norway, v.l p.287 | 1893 O. (part.), A. Della Valle in: F.Fl. Neapel, v.20 p.541 | 1853 Oedicerus (non Kollar & L. Redtenbacher 1844, Coleoptera!), J, D. Dana in: U.S. expl. Exp., e.13u p.933 | 1882 Aedicerus (laps.), Haswell, Cat. Austral. Crust., p. 238, 315. 16* 244 : ° . Oediceros Back of peraeon broad. Rostrum deflexed, acute. Eyes distinet, contiguous, at base of rostrum. Antenna 1 shorter than antenna 2, peduncle of each elongate. Upper lip rounded. Mandible, molar without triturating surface, palp robust. Maxilla 1, inner plate with a few setae, outer plate narrow. Maxilla 2, plates oval, subequal. Maxillipeds, outer plates strongly fringed with spines. Gmnathopods 1 and 2 similar and nearly equal, 5% joint produced to a setose lobe, 6!" oval, palm very oblique. Peraeopods 1—4 short, stout, setose, finger lanceolate. Telson rounded quadrangular. 2 species accepted, 1 doubtful. Synopsis of accepted species: Rostrum goiniculabe: "2.0 ee ein l. O. saginatus . p.244 Rostrum vonliy Burvall sa a a 2. O. borealis . . p. 244 1. O. saginatus Kroyer 1842 O.s., Kreyer in: Naturh. Tidsskr., v.4 p.156 | 1883 O.s., J. S. Schneider in: Tromse Mus. Aarsh., ©.6 p.11 t.2 £.10 | 1892 O.s., G. O. Sars, Crust. Norway, v.1 p.288 t.102 | 1893 O.s. (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.551 t.58 £. 71, 72. Head, rostrum abruptly deflexed, acute, nearly reaching apex of 1° joint of antenna 1; lateral corners quadrate. Side-plates not deep, 4 scarcely emarginate behind, 5'% broader and nearly as deep. Eyes within a rounded prominence, dark red. Antenna 1, 1° and 24 joints equal in length, flagellum scarcely as long as peduncle, 13-jointed. Antenna 2, ulti- mate joint of peduncle as long as penultimate and antepenultimate com- bined, flagellum rather shorter than peduncle. Gnathopods 1 and 2, process of 5th joint slightly eurved and a little dilated in the middle, densely tufted, 6% joint oblong oval, more than twice as long as broad, palm denticulate, long, gently curved, defined by a little tooth, finger long and curved. Peraeopods 1—-4, finger rather short. Peraeopod 5 more than half length of body, 24 joint with sinuous hind margin. Uropod 3, inner ramus rather the longer, with 4 spinules.. Telson little longer than broad,' apex transversely truncate. Colour whitish, tinged with orange, head reticulate and back banded with brown violett. L. 20—30 mm. Aretic Ocean and North-Atlantie (Greenland, Iceland, Spitzbergen, Murman coast, Siberian Polar Sea, Norway). 2. O. borealis Boeck 1871 O.b., A. Boeck in: Forh. Selsk. Christian., 1870 p. 162 | 1876 O.b., A. Boeck, Skand. Arkt. Amphip., ©.2 p.261 t.14 f.1| 1892 O.b., G. 0. Sars, Crust. Norway, ©.1 p.290 t.103 £.1 | 1893 ©. saginatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.551. Head, rostrum evenly curved downward, reaching little beyond middle of 18 joint of antenna 1; lateral corners rounded. Side-plates rather large, 1°t somewhat pentagonal, 4 distinetly emarginate, deeper than 5{". Eyes rather small, contiguous. Antenna 1, flagellum 10-jointed. Antenna. 2, ultimate joint of peduncle scarcely longer than penultimate, flagellum subequalto peduncle. Gnathopods 1 and 2 very strong, process of 5!" joint narrow, sparingly setose, 6! tumid, oval, palm not very long, defined by a little tooth, finger to match the palm. Peragopods 1—4 less stout than in O. saginatus, finger in peraeopods 3 and 4 rather long. Peraeopod 5, 24 joint rounded oval, hind margin scarcely sinuous. Uropod 3 rather small, rami very narrow, inner with 1 spinule. Telson much longer than broad, apex broadly rounded. L. © 9 mm. Arctic Ocean (Greenland, Finmark). 5 Ei Oediceros, Paroediceros 245 0. latrans (Hasw.) 1880 Oedicerus l., Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.324 t.19 £. 1 | 1893 Oediceros |., A. Della Valle in: F. Fl. Neapel, v.20 p. 556. Bondi Bay [New South Wales]. Burrowing in the sand between tide marks. 7. Gen. Paroediceros 0). Sars 1892 Paroediceros, G. O. Sars, Crust. Norway, v.1 p.291. Front of head produced to a process bearing the contiguous eyes, when present, at its distal end. Antenna 1 much shorter than antenna 2. Upper lip with flattened margin. Mandibular palp slender. Gnathopod 1, process of 5th joint insignificant, 6!" joint elongate, distally widened. Peraeopods comparatively slender. Other characters agreeing: with Oediceros (p. 243). 5 species. Synopsis of species: Gnathopod 1, 6th joint extremely elongate — 2. ! Gnathopod 1, 6th joint not extremely elongate — 8. 9 | Frontal process small, without eyes . ...... 1. P. macrocheir . p.245 ‚Frontal process well developed, with eyes . : . . 2. P.intermedius . p. 245 3 | Frontal process deflexed . . -... 2... ... . 8. P. eurvirostris . p.246 Frontal process horizontal — 4. 4 j Eyes large, transverse bands of colour on body . 4. P.l1ynceus . . . p.246 \ Eyes small, no colour bands on body . .. . . . 5. P. propinguus . p.246 1. P. macrocheir (O. Sars) 1879 Oedicerus m., G.O.Sars in: Arch. Naturv. Kristian., .4 p,449 | 1885 Oediceros m., G.O.Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 170 t.14 £.4 | 1887 O.m., H. J. Hansen in: Dijmphna Udb., p.221 | 1892 O. m., Paroediceros (part.), &. O. Sars, Crust. Norway, v.1 p.291 | 1893 O. Iynceus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 546. Head arched, frontal process very small, not tumid. Side-plates 1—4 large and broad, densely fringed, 4 scarcely so deep as the others, 5th distinetly bilobed, 6! and 7tk small. Eyes wanting. Antenna 1 very short, 1° and 24 joints equal in length, flagellum shorter than peduncle, 8-jointed. Antenna 2 more than twice length of antenna 1, ultimate and penultimate joints of peduncle robust, ultimate the shorter, flagellum slender, rather long. Gnathopod 1 very long, 24 joint large and muscular, 3d—5th very short, 6% more than 4 times as long as broad, dilated distally, palm arcuate, oblique, defined by obtuse projection and strong spine. Gmathopod 2 shorter, 5th joint narrowly produced, 6!" shorter and broader than in gnathopod 1, palm very oblique, about half length of the joint. Peraeopods 1 and 2 rather slender, very hirsute, finger large, falciform. Peraeopods 3— 5, 2% joint narrowly ovate; 4!" peraeopod longer than 34, both very hirsute, with long faleiform finger; 5th with short simple setae and long needle-like finger. Uropod 3 shorter than uropod 2, and uropod 2 than uropod 1. Telson_short, apically rounded. Skin pellueid, but with ‘brown-violet arborescent markings. L. 9 18 mm. Arctie Ocean (between Jan Mayen and Iceland). Depth 1890 m. 2. P. intermedius Stebb.*) 1887 Oediceros microps (err., non O. Sars 1882!), H. J: Hansen in: Dijmphna Udb., p.220 t.21 f.12 | 1892 Paroediceros (part.), G.O. Sars, Crust. Norway, v.1 p. 291, 294 | 1893 Oediceros Iynceus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 546. Intermediate between P. propinquus (p. 246) and P. macrocheir. Frontal process produced to end of 1° joint of antenna 1, scarcely deflexed. Side-plates *) Sp. nov. - 246 Paroediceros distally expanded. Eyes placed at apex of frontal process. Antenna 1 reaching about to end of peduncle of antenna 2, both agreeing in general . with those of P. propinguus. Gnathopod 1 agreeing closely with P. macrocheir. L. 115 mm. Kara Sea. Depth 113 m. 3. P. curvirostris (H. J. Hansen) 1876 Oediceros Iynceus (part.), A. Boeck, Skand. Arkt. Amphip.. v.2 p:259 t.13 f.4 | 18958 0.1. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.546 | 1887 O. cwrvirostris, H. J. Hansen in: Vid. Meddel., ser.4 v.9 p. 107 t.4 f.4 | 1892 O.c., Paroediceros (part.), G. O. Sars, Crust. Norway, p. 291. Head, rostrum deflexed, reaching slightly beyond 1°t joint of antenna 1, lateral corners somewhat produced, with rounded apex. Eyes large, some- what remote from downcurved apex of rostrum. Antennae a little more slender than in P. lynceus. Peraeopod 1, finger much longer than 6% joint; in peraeopod 2 rather shorter than it. Peraeopods 3 and 4, finger very little longer than 6" joint. Other points agreeing with P. Iynceus, unless the colour be fainter. L. Q 12:5 mm. Davis Strait (lat. 64° N., long. 53° W., depth 81 m; Godthaab, depth 11-19 m). 4. P.lynceus (Sars) 1858 Oediceros I, M. Sars in: Forh. Selsk. Christian., p-143 | 1876 O.1. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.259 | 1883 O.1., J.S. Schneider in: Tromse Mus. Aarsh., v.6 p.14 t.2 f.12 | 1888 O.1., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.837 t.137s | 1893 O.1. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.546 t.58 f.65, 66 | 1892 Paroediceros I., G. O. Sars, Crust. Norway, v.1 p. 292 t.103 £.2; t. 104 £.1.| 1867 Monoculodes nubilatus, Packard in: Mem. Boston Soe., v.1_ p- 298 t.8 £.4. Head produced horizontally a little beyond 1°t joint of antenna 1, lateral corners produced, acute. Side-plate 1 pentagonal. Pleon segments 1—3 slightly carinate dorsally. Eyes rather large, contiguous, at extremity of frontal process, leaving a minute rostral tip, yellowish red. Antenna 1 in © shorter than peduncle of antenna 2, 1° joint longest, flagellum much shorter than peduncle, 10-jointed. Antenna 2, penultimate joint of peduncle scarcely longer but much thicker than ultimate, very setose, flagellum slender, longer than peduncle, in young C still longer, with very many short joints. Gnatho- pod 1 in length subequal to gnathopod 2, 24 joint moderately dilated, 6!" a little widened at the spine which defines the eurved oblique palm, longer than half the joint, finger longer than the palm. Gnathopod 2, 6! joint oblong oval, palm more than half its length. Peraeopods moderately- slender, finger in peraeopods 1 and 2 shorter than 6% joint, in the others about equal to it in length; in peraeopod 5, 29 joint rather broad, hind margin setose. Uropod 3, rami as. long as or longer than peduncle, inner one with 1 spinule. Telson oval quadrangular, apex truncate, carrying 2 setules. Colour whitish, with brownish-violet bands on back and retieulated on head. L. 22—25 mm. Arctie Ocean (Greenland, Iceland, Spitzbergen, Murman coast, Siberian Polar Sea, Labrador, Finmark). Depth 9—94 m. — No doubt often confused with P. propinquus, so that notices of localities and depths are exposed to some uncertainty. 5. P. propinquus (Gods) 1866 Oediceros p., Goes in: Öfv. Ak. Förh., v.22 p.526 t.39 £.19 | 1892 Paroediceros propingvus, G.O.Sars, Crust. Norway, v.1 p.293 t.104 f.2 | 1882 Oediceros microps, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p. 95 t.4 f.8, 8a| 1883 O.m., J. 8. Schneider in: Tromse Mus. Aarsh., 0.6 p.15 t.2 f.14 | 1893 O. Iynceus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 546. Paroediceros, Haliereion 247 Near to P.Iynceus, but frontal process less tumid, less long, lateral corners of head less produced, side-plate 1 foursided, eyes much smaller, on apex of frontal process, bright red. Antenna 1 in ©, 1° joint scarcely longer than 24, flagellum with 8 joints, shorter than peduncle, but in J twice length of pedunele, with 11 joints, many setose; antenna 2, flagellum in © as long as peduncle, in J reaching end of body. Gnathopod 1, 24 joint fusiform, 6!" about 3 times as long as broad, palm about half its length. Gmnathopod 2 as in P. Iynceus, peraeopods more slender, finger long and (in 1° —4th) faleiform ; 22 joint in peraeopod 5 less dilated. Uropod 3, rami as long as peduncle, narrow, quite unarmed. Telson similar, comparatively smaller. Colour light yellowish, tinged with rose, with no brown markings. L. 10 —11 mm. Arctie Ocean (Varangerfjord (Vadsö), depth 36—146 m; Tromsö, depth 146 m; Kvalö [Nordland]; Spitzbergen, depth 7—55 m; Greenland; Iceland). 8. Gen. Halicreion Boeck 1871 Halicreion (Sp. un.: H.longicaudatus), A. Boeck in: Forh. Selsk. Christian., 1870 p.173 | 1876 H., A. Boeck, Skand. Arkt. Amphip., v.2 p.294 | 1892 H., G.O. Sars, Crust. Norway, v.1 p.321 | 1873 Halicrion, E.v. Martens in: Zool. Rec., v.8 p.190. Head produced to an acute deflexed rostrum. Side-plates of moderate size. Eyes contiguous at base of rostrum. Antenna 1 rather shorter than antenna 2, slender in Q, in © robust with tumid short-jointed peduncle and 1°t joint of lagellum enormous. Mouth-parts as in Monoculodes (p. 258), except that outer plates of maxillipeds are rather shorter and broader. Gnathopods land 2 nearly alike, 6tk joint ovate, process of 5" rather narrower and longer in gnathopod 2 than in gnathopod 1. Peraeopods 1—5 as in Monoculodes; 5! much (not a little, as Boeck says) longer than 3% and 4, Uropod 3 greatly elongate, projeeting far beyond uropods 1 and 2. Telson very small. 1 speeies.. 1. H. aequicornis (Norm.) 1869 Oediceros a., A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.278 | 1893 O.a. (part.), A. Della Valle in: F. Fl. Neapel, «.20 p.545 t.58 f. 638, 64 | 1889 Monoculodes a., A. M. Norman in: Ann. nat. Hist., ser.6 v.3 p.453 t-20 £.1—5 | 1871 Halicreion longicaudatus, A. Boeck in: Forh. Selsk. Christian., 1870 p.173 | 1876 H.1., A. Boeck, Skand. Arkt. Amphip., ®.2 p.295 t.21 f.3 | 1892 H.L, G. O. Sars, Crust. Norway, v.1 p. 322 t. 113 f.2. Rather slender and compressed. Rostrum somewhat compressed, reaching a little beyond 1°* joint of antenna 1. Side-plate 1 scarcely expanded, 4 not very broad. Eyes oval, ill developed, light red, at base of rostrum. Antenna 1 in © reaching end of peduncle of antenna 2, 24 joint a little shorter than 1°, 34 than 24, each with stiff diverging apical setae, flagellum shorter than pedunele, 5-jointed. Antenna 1 ind, 24 and 34 joints very short and thick, flagellum twice as long as peduncle, 1° joint longer than other 4 combined, with 2 rows of long sensory setae in dense tufts. Antenna 2 alike in Cd and ©, ultimate and penultimate joints of peduncle long, slender, subequal, each subequal to 5-jointed flagellum. Gmathopod 1, process of 5t" joint scarcely reaching palm, which is rather oblique, longer than hind margin. Gnathopod 2 subequal to gnathopod 1, process of 5tt joint narrower, reaching palm, 6% joint also narrower, otherwise similar. Peraeopods not very setose. Peraeopods 1 and 2, 4'h joint little expanded, in length equal to 6*", a little longer than the finger. Peraeopods 3 and 4, 24 joint oval, with setae projecting from within distal half of expansion, finger nearly equal to 4" and fully equal to 6!" joint. Peraeo- 248 Haliereion, Arrhis pod 5, very long, 24 joint piriform, 4t" rather shorter than 5tk, 5th than either 6*h or finger. Uropods 1 and 2 scarcely reaching beyond peduncle of uropod 3. Uropod 3, rami narrow, lanceolate, unarmed, longer than the long peduncle. Telson scarcely longer than broad, apieal margin slightly concave. Colour whitish tinged with yellow. L. © 5, d 4 mm. North-Atlantie, North-Sea and Christianiafjord aber, depth 94—188 m; St. Magnus Bay [Shetland Islands], depth 55—110 m). 9. Gen. Arrhis Stebb.*) 1861 Aceros (Sp. typ.: Oedicerus obtusus) (non ©. L. Bonaparte 1850, Aves!), A. Boeck in: Forh. Skand. Naturf., Mede 8 p.651 | 187F A., A. Boeck in: Forh. Selsk. Christian., 1870 p. 172 | 1892 A., G. O. Sars, Crust. Norway, v.1 p. 338. Body slender. Head without frontal process. Side-plates not deep, 1° produced forward. Eyes inconspicuous, their pigment patches not con- tiguous. Antenna 1 in Q longer than antenna 2, or as long, peduncle very long, much longer than in antenna 2, flagellum short. Lower lip, inner lobes separate. Mandible strong, eutting edge little dentate, molar strong, 24 joint of palp arcuate. .Maxilla 1, outer plate with 7 spines (Schneider). Maxillipeds, inner ' plates not reaching apex of 1° joint of palp, outer not nearly reaching apex of the distally widened 24 joint. Gnathopods 1 and 2, 5" joint long, produced to narrow setose process, 6'" oval, palm oblique, pretty well defined. Peraeo- pods 1 and 2 rather longer than peraeopods 3 and 4, finger in all lanceolate. Peraeopod 5, uropods 1—3 and telson not generically distinetive. 1 species. 1. A. phyllonyx (Sars) 1858 Leucotho@ p., M. Sars in: Forh. Selsk. Christian., p- 148 | 1862 Montagua p., Bate, Cat. Amphip. Brit. Mus., p. 369 | 1871 Aceros p., A. Boeck in: Forh. Selsk. Christian., 1870 p.172 | 1887 A.p., H.J. Hansen in: Vid. Meddel., ser.4 v.9 p.117 t.4 f.7 | 1892 4A.p., G. O. Sars, Crust. Norway, v.1l p.338 t.119; 1.120 f.1 | 1893 Halimedon p., A. Della Valle in: F. Fl. Neapel, v.20 p.535 t. 58 f. 23—27 | 1859 Oediceros obtusus, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.92 t.4 f.17 | 1861 Oedicerus o., Aceros sp. typ., A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 651. - Tumid anteriorly. Head tumid with swollen cheeks, front truncate. Side-plate 1 produced along lower side margins of head, 34 with insinuate lower margin, 5th, 6th and 7tk unusually broad. Eyes separate, on sides of head near the front, represented by 2 small patches of whitisb pigment. AntennalinO, 24 joint nearly twice as long as 1°, setose on both edges, flagellum very short, 11-jointed, in (young) © somewhat longer. Antenna 2, ultimate and penultimate joints of peduncle subequal, and together as long as flagellum in Q, flagellum longer in d. Gmathopod 1, 5" joint longer than 6th, its setose process not lying near hind margin of 6", palm longer than the hind margin. Gnathopod 2 nearly resembling gnathopod 1, but longer, and process of 5th joint narrow, lying near margin of 6, Peraeopods 1 and 2, 24 joint bent, 4th large, very setose, 5tb and 6!" equal, finger shorter, compressed, lanceolate. Peraeopods 3 and 4, 24 joint long oval, finger as long as 6% joint. Peraeopod 5 elongate, 24 joint large, elongate piriform, 5% joint shorter than 4, much shorter than 6t%, Uropods 1 and 2, rami densely spinose, uropod 3, *) Nom. nov. üßfıc, without nose. — The name Aceros is preoccupied (1850, C. L. Bonaparte, Consp. Av., v.1 p. 90). 2 3 2 7 a r Arrhis, Westwoodilla 249 rami spinulose, about as long as peduncle. Telson almost a square. Colour whitish, with tinge of flesh colour. L. 15—20 mm. Arctic Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland, Iceland, Spitzbergen ete.; Norway, depth 90—753 m; Bohuslän); German Ocean? 10. Gen. Westwoodilla Bate - 1856 Westwoodea (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 Westwoodia (Sp. un.: W.caecula) (non Brull& 1846, Hymenoptera!), Bate in: Ann. nat. Hist., ser. 2 v.19 p. 139 | 1862 Westwoodilla, Bate, Cat. Amphip. Brit. Mus., p.102 | 1871 Halimedon (part.). A. Boeck in: Forh. Selsk. Christian., 1870 p.169 | 1892 H., G. ©. Sars, Crust. Norway, v.1 p. 8326 | 1893 H. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 533. Head with frontal process ending in acute rostrum, usually short. Side-plates of moderate size, 4! with lower hind corner not produced, narrower than 5". Eyes contiguous on frontal process. Antenna 1 shorter than antenna 2, flagellum of antenna 2 in C very elongate. Upper lip with angular sides. Lower lip, inner lobes well defined. Mandible strong, eutting edge indistinetly dentate, molar well defined, palp slender, 24 joint longest, much ceurved. Maxilla 1, outer plate carrying 8 spines (Schneider). Maxillipeds, inner plates rather short, outer reaching apex of 24 joint of moderate-sized palp. Gmnathopods 1 and 2 nearly alike, rather feeble, 5t" joint long, ending in short setose expansion, 6% rather small, oblong oval. Peraeopods 1—5, uropods 1—3 and telson as in Monoculodes (p. 258). 5 species. Synopsis of species: 1 Frontal process deflexed — 2. - 1 Frontal process horizontal — 4. 9 f Rostral apex delezed .. 2... ..... 1. W. brevicalcar . p.249 \ Rostral apex not deflexed — 3. , Eyes oval, of moderate size...» 2 2.2.2 .. 2. W.caecula . . . p.250 Eyes rounded, unusually large. . . . 2... 8. W. megalops . . p.250 Eyes not prominent, at centre of tapering frontal ER IE RE EEE 4. W. acutifrons . . p.251 Eyes prominent, at distal end of elongate frontal en ee 5. W. rectirostris . p.251 1. W. breviealear (Goes) 1866 Oediceros b., Go@s in: Öfv. Ak. Förh., v.22 p-527 t.39 1.22 | 1871 Halimedon b., A. Boeck in: Forh. Selsk. Christian., 1870 p.171| 1876 H.%., A. Boeck, Skand. Arkt. Amphip., v.2 p.286 t.15 f.3| 1883 H.b., J.S. Schneider in: Tromse Mus. Aarsh., ©.6 p.37 t.2 f£.11 | 1892 H.b., G. O. Sars, Crust. Norway, v.l p.351 t.116 f.3 | 1895 H.b. (part.), A. DelleValle in: F. Fl. Neapel, v.20 p. 539. Rather short and stout. Head frontal process short, evenly curved, the acute deflexed rostrum reaching a little beyond middle of 1° joint of antenna 1. Side-plate 1 little expanded distally. Eyes of moderate size, rounded oval, bright red, at base of frontal process. Antenna 1 in Q reaching beyond pedunele of antenna 2, 24 joint shorter than 1°, flagellum a little shorter than peduncle, 7-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum about as long as the 2 combined. Gnathopod 1, 5tk joint not much longer than its width at the somewhat projecting process, 6! joint 250 Westwoodilla as long as 5tk, oval, palm oblique, rather longer than hind margin. Gnatho- pod 2 more elongate, process of 5'k joint little projecting, palm of 6'% scarcely longer than hind margin. Peraeopods 1—4, finger nearly as long as the narrow linear 6*" joint; in peraeopods 3 and 4, 24 joint oval, with long setae projecting from within most of the expansion. Peraeopod 5, 24 joint piriform, 4%, 5th and 6th subequal. Uropod 3, rami narrow, longer than peduncle. Telson decidedly longer than broad, quadrangular, apically truncate, armed with spinules. Colour whitish, tinged with yellow. L. © 6 mm. Arctie Ocean (Iceland, Greenland, Spitzbergen; Norway, depth 9—55 m). 2. W. caecula (Bate) 1856 Westwoodea caeculus (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.58 | 1857 Westwoodia caecula, Bate in: Ann. nat. Hist., ser.2 v.19 p. 140 | 1862 Westwoodilla c. + W. hyalina, Bate, Cat. Amphip. Brit. Mus., p. 102 t.16 f.5; p.103 t.17 f.5 | 1862 Oediceros parvimanus, Bate & Westwood, Brit. sess. Crust.; v.1 p.161 f. | 1889 Halimedon p., A. M. Norman in: Ann. nat. Hist.,. ser.6 v.3 p.455 t.20 £.10—14 | 1893 H.p., A. Della Valle in: F. Fl. Neapel, v.20 p.539 t.58 f.38—40 | 1871 H. molleri, A. Boeck in: Forh. Selsk. Christian., 1870 p.169 | 1876 H. mülleri, A. Boeck, Skand. Arkt. Amphip., e.2 p.281 t.13 f.5 | 1883 H. m., J. S. Schneider in: Tromss Mus. Aarsh., v.6 p.33 t.3 £.17 | 1892 H. m., G. O0. Sars, Crust. Norway, v1 p. 327 t. 115. Rather slender, but tumid anteriorly. Frontal process rather large, strongly arched distally, but the small rostral apex projected horizontally. Side-plate 1 much expanded and produced forward, 5" nearly as deep as 4h. Eyes of moderate size, oval, light red, at distal end of frontal process. Antenna 1 in 9 little longer than peduncle of antenna 2, 24 joint rather longer than 1°, flagellum as long as 24 and 39 combined, 10-jointed. Antenna 1 in JS, 1° and 24 joints _ equal, flagellum longer than peduncle, with 14 joints, first 10 thiekened, hirsute. Antenna 2in O, ultimate joint of pedunele longer than penultimate, both densely setose, together longer than flagellum. Antenna 2 in J, peduncle nearly bare, flagellum very long, filiform. Gmathopod 1 rather feeble, process of 5t" joint broadly rounded and setose, 6! joint subequal to 5%, oblong oval, palm ill- defined, nearly twice as long as hind margin. Gnathopod 2 similar to gnatho- pod 1, but longer and more slender. Peraeopods 1—4 densely setose, the finger about as long as 6" joint, the latter in peraeopods 1 and 2 subfusiform, with dense tufts on distal half of front margin. Peraeopod 5, 24 joint rounded oval, 4!" and 5!" equal, 6% rather longer than either. Uropod 3, rami spinulose, narrowly lanceolate, longer than peduncle. Telson oval, apex broadly rounded, carrying several setules. Colour pellueid whitish, lightly tinged with red; ova orange-coloured. L. 8 mm. ArcticOcean, North-Atlantie, North-Sea and Skagerrak (Norway, depth 36—-376m; France, Great Britain; West Greenland, depth 47—400 m); Kattegat. 3. W. megalops (0. Sars) 1882 Halimedon m., G. O. Sars in: Forh. Selsk. Christian., nr.18 p.96 t.4 f.9,9a | 1883 H.m., J. S. Schneider in: Tromse Mus. Aarsh., v.6 p.38 t.2 f.9 | 1892 H. m., G. O. Sars, Crust. Norway, v.1 p.330 t.116 f.2 | 1893 H. brevicalcar (part.), A. Della Valle in: F. Fl. Neapel, v.20°p. 589. Very tumid anteriorly. Frontal process broad, strongly arched, the small rostral apex jutting out nearly to end of 1° joint of antenna 1. Side-plate 1 a little expanded distally, 5!" deeidedly less deep than 4%. Eyes unusually large, rounded, prominent, dark red, occupying most of frontal process. Antenna 1 in © short, little longer than peduncle of antenna 2, 1° joint as long as 24 and 3% combined, flagellum shorter than peduncele, 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum nearly aslong as peduncle. Westwoodilla 251 Maxilla 1, outer plate with 8 spines, 24 joint of palp narrower than 1s (Schneider). Gnathopods 1 and 2, 5% joint distally widened, alike in both pairs, 6% joint oval, longer than 5% (Sars) or equal to it (Schneider), palm in gnathopod 1 much longer than hind margin, in gnathopod 2 little longer. Peraeopods 1—4, 6!" joint narrow linear, sparingly setose, finger about as long. Peraeopod 5, 24 joint broad, obliquely quadrate, 4 and 5th subequal, 6th rather longer. Uropod 3, rami a little longer than peduncle, each carrying 2 spinules. Telson quadrate, nearly as broad as long, slightly narrowed at truncate apex, which has 2 setules. Colour yellowish orange mottled with reddish brown; antennae banded with orange. L. © 6 mm. Arctie Ocean and North-Atlantie (North-Norway). Depth 36—55 m. 4. W. acutifrons (0. Sars) 1892 Halimedon a., G. O.Sars, Crust. Norway, v.1 p.329 1.116 £.1. Rather slender. Frontal process rather long, little arched, gradually tapering to an acute horizontally projected rostral apex reaching beyond 1°t joint of, antenna 1. Side-plate 1 much expanded and produced forward, 5tk Jess deep than 4th, Eyes oblong oval, light red, covering centre of frontal process. Antenna 1 in O, 24 joint longer than Ist, flagellum shorter than 24 and 34 combined, 10-jointed. Antenna 2, ultimate and EEE, joints of pedunele subequal, flagellum less than the 2 combined. Gnathopods 1 and 2 feeble. Gnathopod 1, 5t& joint distally much expanded, 6tk rather longer, more than twice as long as broad, palm very oblique, longer than hind margin. Gnathopod 2, 5t" joint less expanded, 6'h narrower than in gnathopod 1, equal in length to 5% joint, palm scarcely longer than hind margin. Peraeo- pods 1 and 2, 6tk joint slightly expanded at setose distal end, finger nearly as long. Peraeopods 3 and 4, finger longer than 6" joint. Peraeopod 5 very long, 23 joint broad above, 5th and 6th joints subequal, longer than 4%, Uropod 3, rami narrow, spinuliferous, longer than peduncle. Telson oval, apex not very broadly rounded. Colour whitish, faintly tinged with yellow; ova rose- coloured. ‘'L. Q 8 mm. } North-Atlantie (Apelvaer [Namdal], Trondhjemsfjord). Depth 90—270 m. 5. W. rectirostris (Della Valle) . 1893 Halimedon r., A. Della Valle in: F. Fl. Neapel, v.20 p. 587 1.4 £.6; 1.33 £.1—15. Rather slender. Frontal process elongate, horizontally projected. Side- plate 1 greatly expanded distally and produced forward, 5'% much broader than 4" and nearly as deep. Eyes small, rounded, prominent, bright vermilion, at apex of frontal process, leaving a very minute rostral point (a single eye is represented on t. 33, with no dividing line). Antenna 1 in Oo , 2 joint as long as 1°t, 39 more than half length of 24, flagellum shorter than peduncle, 10-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum in O as long as the 2 combined, 12-jointed. Gnathopods 1 and 2 said to be almost exactly alike, 5! joint triangular, as long as 6®%, hinder distal angle dilated, not produced, 6! joint almond-shaped. In the figures the angle of 5% joint is as usual more broadly dilated in gnathopod 1 than in gnathopod 2, and the palm of 6 joint is much longer than hind margin in gnathopod 1, and little longer than it in gnathopod 2, but the 6! joint of gnathopod 1 is 2'/, times as long as broad, and in gnathopod 2 only twice. Peraeopods 1, 2 and 4, finger subequal to 6" joint, in peraeopod 3 longer than it. Peraeopod 5, 22 joint broad, 4 longer than 5tb or 6t, finger shorter than 6'k. Uropod 3, 252 Westwoodilla, Carolobatea, Oediceropsis rami longer than peduncle. Telson longer than broad, sides insinuatg, distal margin flatly rounded. Colour orange-yellow blotehed with lemon- vellow. L. 5—6 mm. Gulf of Naples. In muddy sand, depth 12—20 m. 11. Gen. Carolobatea Stebb. 1899 Carolobatea (Sp. typ.: Halimedon schneideri), T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 208. Frontal process of head apically subaeute. Side-plate 1 distally expanded, 4th much deeper than the rest, 5!" nearly as broad as 4. Eyes contiguous, on frontal process. Antenna 1 in Q shorter than antenna 2, flagellum in both many-jointed. Upper lip with sides angular. Lower lip with inner lobes separate. Mandible, cutting edge bluntly dentate, molar rather weak, 24 joint of palp very slightly bent. Maxilla 1, outer plate with 9 spines; maxilla 2, inner plate the broader. Maxillipeds, inner plates small, not reaching apex of 18 joint of palp, outer plates not nearly reaching apex of distally expanded 24 joint ofpalp. Gnathopods 1 and 2, 5% joint subequal to 6*, distally widened and slightly produced, 6% oblong, a little widened distally, palm well defined, very slightly oblique, much shorter than hind margin. Peraeopods 1—4, finger narrowly boat-shaped, and as in gnathopods 1 and 2 having a membranous cap over the tip; in 1%, 24 and 4tk pairs finger as long as 6!" joint. Uropod 3, rami subequal to peduncle. Telson rather longer than broad. l species. 1. C. schneideri (Stebb.) 1888 Halimedon s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.839 t.59 | 1899 H.s., Carolobatea sp. typ., T. Stebbing in: Ann, nat, Hist., ser.7 v.4 p.209 | 1893 H. brevicalcar (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.589 t.58 f.4l, 42. . Frontal process deflexed, reaching end of 1° joint of antenna 1. Eyes dark, elongate, widened distally (apparently not always persistent in alcohol). Antenna lin Q, 24 joint rather longer than 1%, flagellum shorter than peduncle, 17-jointed. Antenna 2, ultimate joint of pedunecle shorter than penultimate, flagellum shorter than the 2 combined, 24-jointed. Gnathopod 2 longer and more slender than gnathopod 1, the palm a little more oblique, but in both defined by a well marked angle with palmar spine. ‘Peraeopods 1—4, 6tlı joint with brush of setae on lower half of the convex margin; in peraeo- pods 3 and 4, hind margin of 24 joint sinuous. Peraeopod 5 imperfeet, but with the family character indicated. Telson narrowing distally, apical margin very slightly insinuate. L. © (from front of head to end of outstretched uropod) 13 mm. Southern Indian Ocean (Kerguelen Island). 12. Gen. Oediceropsis Lillj. 1865 Oediceropsis (Sp. un.: ©. brevicornis), W. Lilljeborg in : N. Acta Soc. Upsal., ser.8 v.6 nr. 1 p.18, 19 | 1871 O., A. Boeck in: Forh, Selsk. Christian., 1870 p. 174 1892 O., G. O. Sars, Crust. Norway, v.1 p. 324. Head without frontal process, but narrowed anteriorly. Side-plates 1—4 rather large, 1° expanded distally, 4!" excavate behind, 5tt small. Eyes lateral. Antenna 1 very small. Antenna 2 large, penultimate joint of peduncle Oediceropsis, Acanthostepheia 5 ‚253 very large, flagellum of many short calceoliferous joints both in Q and GC. Upper lip with margin evenly convex. Mandibular palp elongate. Maxilla 2, inner plate much wider than outer. Plates of maxillipeds rather broad in proportion to length. Gnathopods 1 and 2, 5" joint short with rather small - setose lobe, 6" long ovate, palm much longer than hind margin. Peraeo- pods 1 and 2 feeble. Peraeopods 3 and 4 Strong. Uropod 3, rami longer than peduncle. Telson very small. l speeies. 1. O. brevicornis Lillj. 1865 O. b., W. Lilljeborg in: N. Acta Soc. Upsal., ser.8 e.6 nr.1 p.19 | 1876 O.b., A. Boeck, Skand. Arkt. Amphip., v.2 p. 297 t.13 £.2| 1892 O.b., G. O. Sars, Crust. Norway, v.1 p.325 t.114 | 1893 Oediceros b., A. Della Valle in: F. Fl. Neapel, v.20 p. 543 t.58 f. 50—52. Head with minute rostrum and sinuous margin on each side below it. Side-plate 1 densely setose, 4% very broad distally. Eyes rounded triangular, light red, no distinct lenses. Antenna 1 only reaching middle of penultimate joint of peduncle of antenna 2, 1° joint longer than 24, flagellum shorter than peduncle, 10-jointed. Antenna 2, penultimate joint of peduncle with conspieuous spine at apex, ultimate only about half as long, with 5 large spines, flagellum shorter than peduncle, very flexible. Mandibular palp nearly twice as long as trunk of mandible. Gmathopods 1 and 2, palm nearly 4 times as long as hind margin, slightly defined, set with setae and spinules; palm and finger rather longer in gnathopod 2. Peraeopods 1—4 very setose, finger slender, long. Peraeopods 1 and 2, 5! joint longer than 4! or 6, Peraeopods 3 and 4, 5th joint shorter than 4; peraeopod 4, 6tk joint and finger elongate. Peraeopod 5, 24 joint expanded, tufts of spinules on others. Uropod 3 not reaching beyond-the others. Telson oval quadrangular., Colour pale flesh- tinge, pellueid. L. © 11 mm. North-Atlantie and Arctic Ocean (West-Norway, to Lofoten Islands). Depth 94—-564 m. 13. Gen. Acanthostepheia Boeck 1871 Acanthostepheia (Sp. un.: A. malmgreni), A. Boeck in: Forh:. Selsk. Christian., 1870 p.163 | 1876 A., A. Boeck, Skand. Arkt. Amphip., v.2 p.262 | 1894 A., T. Stebbing in: Bijdr. Dierk., v.17 p.24 | 1873 Acanthostephia, E. v. Martens in: Zool. Rec., 9.8 p.190. Carinate, peraeon broad, pleon compressed. Rostrum long, tapering, earinate, about reaching apex of 1° joint of antenna 1. Side-plate 1 distally expanded, 5t" as large as the 4th, Eyes separated by carina of head, large, oval or reniform, prominent. Antenna 1 shorter than antenna 2, 24 joint shorter than 1%. Mouth-parts nearly as in Monoculodes (p. 258). Gnatho- pods 1 and 2 similar, 5% joint rather ‚short, with prominent round-ended process, 6" Jarge oval, the oblique palm much longer than hind margin, finger as long as palm. Peraeopods 1 and 2, finger small. Peraeopods 3 and 4, finger rather large, lanceolate. Uropod 3, rami not longer than pedunele. Telson short, quadrate. 2 species accepted, 1 doubtful. Synopsis of accepted species: Eyes divergent . ..... . DE RE a es 1. A. malmgreni . p.254 N a ae 2. A.pulchra . . . p. 254 254 Acanthostepheia, Aceroides 1. A. malmgreni (Goes) 1866 Amphithonotus m., Goes in: Öfv. Ak. Förh., v.22 p.526 t.39 f.17 | 1871 Acanthostepheia m., A. Boeck in: Forh. Selsk. Christian. 1870 p.163 | 1876 A. m., A. Boeck, Skand. Arkt. Amphip., v.2 p.263 | 1894 A. m., T. Stebbing in: Bijdr. Dierk., v.17 p.24 | 1887 A. malmgreni, H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p. 104 | 1893 Oediceros m. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 544 t.58 f.55. Head, rostrum not always reaching end of 1° joint of antenna 1, lateral angles acute, carina not quite extending to hind margin. Peraeon segments strongly ridged transversely, carina rudimentary on first 5, on 7th and on pleon segments 1—4 longitudinally bidentate. Postero-lateral angles of peraeon segments 5—7 and pleon segments 1—3 acute, intermediate ridges on the latter. Side-plates 5 and 6 with 2 acute lobes, 7th with one acute lobe. Eyes reniform, diverging backward from base of rostrum. Antenna 1, 1° joint very long, 24 rather shorter, flagellum subequal to peduncle, 40-jointed. Antenna 2, ultimate and penultimate joints of peduncle long, subequal. Gnathopod 2, process of 5b joint rather longer and narrower, and 6*" joint rather longer than in gnathopod 1. Peraeopods 1—5 not very hirsute, finger shorter than 6! joint in peraeopods 1 and 2, longer than it in peraeopods 3 and 4. Peraeopod 5, 24 joint longitudinally carinate, 5tR and 6th joints much longer than 4b, 5tk a little longer than 6%. Uropod 3, peduncle carinate, decidedly longer than rami. Telson little longer than broad, distally a little emarginate. Colour dull yellow, dorsally red. L. sometimes 45 mm. Arctie Ocean (Spitzbergen, Franz Joseph Land, Siberia, Barents Sea, Kara Sea, Greenland). Depth 10-300 m. 2. A. pulchra Miers 1881 A.p., Miers in: Ann. nat. Hist., ser.5 ©.7 p.47 t.7 £.1,2 | 1894 A.p., T. Stebbing in: Bijdr. Dierk, v.17 p.25 | 1882 Acanthostephia malmgreni (err., non Amphithonotus m. Goes 1866!), Stuxberg in: Vega-Exp., v.1 p.724 f. (no description) | 1898 Oediceros malmgrenii (part.), A. Della Valle in: F. Fl. Neapel 2.20 p. 544. Head, rostrum reaching fully to or beyond apex of 1° joint of antenna 1, lateral angles acute, but almost quadrate, carina not quite extending to hind margin. Ridges and carina of peraeon and pleon similar to those in A. malmgreni, but far less strongly developed, carina of pleon segment 3 scarcely bidentate. Postero-lateral angles of peraeon segments 5—7 and pleon segments 1—3 rounded. Side-plates 5 and 6 with rounded lobes, the hinder produced much below the front one. Eyes oval, parallel. Antenna 1 shorter than in A. malmgreni, 24 joint considerably shorter than 1°, flagellum about 20-jointed. Antenna 2, ultimate joint of pedunele considerably longer than penultimate. Peraeopods 1—4, finger not longer than 6!" joint. Peraeopod 5, 24 joint not distinetly carinate, 5t" joint longer than 4h, 6th Jonger than 5, Uropod 3, rami nearly as long as peduncle. Telson as in A. malmgreni. L. 37 mm. Arctic Ocean (Franz Jöseph Land, Siberia). Depth 6--192 m. A. behringiensis (Lockington) 1877 Oedicerus b., Lockington in: P. Calif. Ae., v.7 p.47 | 1893 O.b., A. Della Valle in: F. Fl. Neapel, v.20 p. 556. : Perhaps identical with A. pulchra. L. about 32 mm. North of Behring Strait (West Alaska). 14. Gen. Aceroides 0. Sars 1892 Aceroides, Aceropsis (Sp. un.: A. latipes) (non Aceropsis Stuxberg 1880, nom. nud.), G. O. Sars, Crust. Norway, v.1 p. 340. fs ale Sa a 4 ua Aceroides, Bathymedon .. 255 Head with small but distinet rostrum. Side-plates not deep, 1° not expanded. Eyes absent. Antennal in O longer than antenna 2, peduncle rather short, flagellum much longer. Upper lip broad, with margin scarcely insinuate. Lower lip with inner lobes separate. Mandible less strong than in Arrhis (p. 248), palp straight. Maxillae 1 and 2, maxillipeds and gnathopods 1 and 2 as in that genus. Peraeopods 1 and 2 (Fig. 63) large, 4" to 7!" joints much expanded. Peraeopods 3 and 4 much smaller, 29 joint little expanded, finger slender. Peraeopod 5 characteristic of the family. Uropods 1—3 and telson normal. 1 species. 1. A. latipes (0. Sars) 1866 Oediceros obtusus var., Goes in: Öfv. Ak. Förh., v.22 p.527, 536 t.40 f.24, 24° | 1882 Halicreion latipes, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.97 t.4 f£.10 | 1883 H.?l., J.S. Schneider in: Tromse Mus. Aarsh., v.6 p.43 | 1892 & 98 Aceropsis l., Aceroides l., G. O. Sars, Crust. Norway, v.1 t.120 f.2; p.341 | 1887 Aceros distinguendus, H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.118 t.4 f.8 | 1893 Halimedon d., A. Della Valle in: F, Fl. Neapel, v.20 p. 916. Neither very slender nor in front very tumid. Rostrum very small, acute. Side-plate 1 obliquely quadrate, 3% slightly emarginate below, subequal to 4th, 5th —_7th proad. Antenna 1 in Oo, 1% joint as long as 24 and 32 combined, flagellum nearly twice as long as peduncle, with 12 joints, each with 2 long setae. Antenna 2 in Q much shorter, ultimate joint of peduncle shorter than penultimate, flagellum as long as the 2 combined. Gmnathopod 1, 5 joint shorter than 6", process rather large, pointed obli- quely forward, 6 joint oblong oval widening to oblique palm, which is longer than hind margin. Gnathopod 2, 5" joint with very narrow process, 6th elongate, palm shorter than hind margin. Peraeo- pods 1 and 2 (Fig. 63) very large and powerful, 4th joint much expanded distally, a curved ridge on the outside fringed with long setae, 5!" joint short, heart shaped, setose, 6‘ expanded distally, finger large, foliaceous. Peraeopods 3 and 4 much Fig. 63. A. latipes. Peraeopod 1. more feebly eonstructed, subequal to one another, ratter 6.0. Sars.] 24 joint not oval, finger slender. Peraeopod 5, 24 joint large, oval, 5tk much shorter than 4 or 6%. Uropod 3, rami with a few spinules, narrowly lanceolate, longer than peduncle. Telson nearly square. L. © (young?) 5 mm. Arctic Ocean (Spitzbergen; Kara Sea; Greenland; Varangerfjord . [Norway], depth 144—188 m). 15. Gen. Bathymedon 0. Sars 1871 Halimedon (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p. 169 | 1892 Bathymedon, G. O. Sars, Crust. Norway, v.1 p. 332. Near to Westwoodilla (p. 249). Front of head produced to a short rostrum, lateral angles deep, quadrate. Side-plates not very large, sparingly setose. Eyes poorly developed or wanting. Mandible powerful, 24 joint of palp only a little or not arcuate. Maxillipeds, outer plates rather large, though sometimes not reaching apex of 24 joint of palp. Gnathopods 1 and 2, 5b joint usually long, with or without distal process, 6tk joint usually oval, not very large, palm oblique. Gnathopod 2 longer and more slender than gnathopod 1. Other characters nearly as in Westwoodilla (p. 249). 4 species. 256 Bathymedon Synopsis of species: ıJ Gnathopod 2, 5th joint well expanded distally . . 1. B. obtusifrons . p.256 \ Gnathopod 2, 5th joint scarcely at all expanded — 2. 'f Gnathopod 2, 5th joint much shorter than 6th . . 2. B. saussurei . . p.256 . | Gnathopod 2, 5th joint longer than 6th — 8. 3 | Eyes represented by white pigment .......- 3. B. longimanus . p.257 Eyes entirely wanting . . » » 2: 22.2.2 .2 2... 4. B. acutifrons . . p. 257 1. B. obtusifrons (H.J. Hansen) ?1883 Halimedon sayssurei (err., non A. Boeck 1871?), J. S. Schneider in: Tromse Mus. Aarsh., v.6 p.35 t.2 f.13 | 1887 H. obtusifrons, H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.116 t.5 f.1—le | 1895 H.o., A. Della Valle in: F. Fl. Neapel, v.20 p.536 t.58 f.30—32 | 1892 Bathymedon o., G.O. Sars, Crust. Norway, v.1 p.336 t.118 f.2. Body tumid anteriorly. Rostrum very short and blunt. Side-plate 1 expanded. Eyes imperfeetly developed, rounded, light red, dorsal behind rostrum. Antenna 1 in 9 a little longer than peduncle of antenna 2, 1° joint longer than 24, flagellum longer than pedunele. Antenna 2, ultimate and penultimate joints of peduncle subequal, together as long as flagellum. Divergent setae on - 24 joint -- — —. 7% joint Fig. 64. B. saussurei. Peraeopod 5. [After @G. 0. Sars.] apices of joints of peduncle in antennae 1 and 2. Upper lip, sides obtusely angled. Mandible, 24 joint of palp straight. Maxillipeds, outer plates reaching end of palp’s 24 joint. Gnathopod 1, 5" joint not longer than 6%, distally expanded into a much projecting narrow lobe, 6tk rather broad at pretty well defined palm. Gnathopod 2 much longer than gnathopod 1, 5tk joint similarly produced, 6% long oval, palm twice as long as hind margin with very long palmar spine, finger very long, curved, serrate within. Peraeo- pods 1—4 strongly built, setose, finger lanceolate, short. Peraeopod 5, 5th joint rather shorter than 4 or 6, Uropod 3, rami narrowly lanceolate, spinuliferous, nearly twice length of peduncle. Telson rather longer than broad, narrowed distally, apical margin truncate. Colour whitish tinged with yellowish; ova orange-coloured. L. © 5 mm. Arctie Ocean (Greenland; Tromsö, Varangerfjord, depth 188 m). 2 B. saussurei (Boeck) 1871 Halimedon s., A. Boeck in: Forh. Selsk. Christian., 1870 p.170 | 1876 H.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.283 t.15 f.1 | 1893 H.s., A. Della Valle in: F. Fl. Neapel, v.20 p.535 t.58 f. 28,29 | 1892 Bathymeldon s., G. ©. Sars, Crust. Norway. v.1 p. 335 t.118 £.1. Body slender. Rostrum acute, reaching a little beyond middle of 1° joint of antenna 1. Side-plate 1 distally expanded, 5!" hroad. Eyes represented by irregular whitish pigment not extending beyond the head. Antenna lin oO, 24 joint considerably longer than 1°, flagellum as long as peduncle, 14-jointed. Antenna 2 in O not longer than an- tenna 1, ultimate and penultimate joints of pedunele nearly equal, together as long as flagellum. Gmathopod 1, 5t" joint narrowly produced a little forwards, 6!" joint subequal to 5th, oblong oval, palm subequal to hind margin. Gmathopod 2 slender and feeble, 5" joint with very slight process, 6!" much longer than 5tt, almost linear, palm short and ill-defined. Peraeopods 1 and 2, finger long and slender. Peraeopod 3 much shorter than peraeopod 4, finger as long as 6" joint. Peraeopod 4, 6!" joint much longer 5 # 2 1 Bathymedon, Monoeulopsis 257 than the long finger. Peraeopod 5 (Fig. 64) slender, unusually long, very fragile, 24 joint broad oval, 5t® longer than 6th, 6th than Ah, Uropod 3, pedunele longer than 'rami, inner ramus with dense row of minute spinules on inner margin. Telson small, as broad as long, rounded quadrangular, apical border insinuate. Colour pale yellowish, peraeon transversely banded with faint whitish stripes. L. © 5 mm. Skagerrak, North-Sea and North-Atlantie (Christianiafjord to Trondhjemsfjord). Depth 94—564 m. 3. B. longimanus (Boeck) 1871 Halimedon1., A. Boeck in: Forh. Selsk. Christian., 1870 p.170 | 1876 H.1., A. Boeck, Skand. Arkt. Amphip., e.2 p.284 t.13 £.6 | 1883 H.|., J. S. Schneider in: Tromse Mus. Aarsh., e.6 p.34 t.3 f.16 | 1893 H.1., A. Della Valle in: F. Fl. Neapel, v.20 p.538 t.58 f.36, 37 | 1892 Bathymedon I., G. ©. Sars, Crust. Norway, v.1 p.333 t. 117. Body rather slender and eompressed, thin-skinned. Small acute rostrum reaching about middle of 1° joint of antenna 1. 1° side-plate distally ex- panded and produced, 5t® broad. Eyes represented by chalky white pigment irregularly distributed within head and front of peraeon. Antenna 1, 24 joint longer than 1°, flagellum in © short, with 10 joints, in GC longer, with 22 setose joints. Antenna 2 in O, ultimate and penultimate joints of peduncle subequal, together as long as flagellum, in JS ultimate rather longer than penultimate, flagellum filiform, elongate. Mandible, 24 joint of palp slightly arcuate. Maxillipeds, outer plates not reaching apex of 24 joint of palp. . Gnathopod 1, 5tk joint with short broad distal expansion, 6% rather shorter, . oval, palm longer than hind margin, defined by a long spine. Gnathopod 2 much more slender, 5t% joint scarcely at all expanded, elongate, 6 joint much shorter, palm twice as long as hind margin, defined by a spine. Peraeo- pods 1—4 setose, finger longer in peraeopods 1 and 2 than jn peraeopods 3 and 4.. Peraeopod 5, 24 joint large, piriform, 5t shorter than 4", 4th than 6", Uropod 3, peduncle stout, rami rather longer, spinuliferous. Telson scarcely as long as breadth at base, narrowing to somewhat emarginate apical border. Colour pale yellowish; ova vellowish. L. 6 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (South- and West-Norway northward to Lofoten Isles). Depth 94—376 m. 4. B. acutifrons Bonnier 1896 B. a., J. Bonnier in: Ann. Univ. Lyon, v. 26 p. 643 t. 38 f.2. Nearly akin to B. longimanus. Rostrum very small, acute. Side-plate 1 distally expanded and produced, 5!" broad. Eyes and ocular pigment entirely wanting. Antenna 1, 1° and 24 joints equal, 39 very short, flagellum multi- articulate. Antenna 2 in © much longer, ultimate and penultimate joints of peduncle subequal, long. Mandible, 2? joint of palp not arcuate. Maxillipeds, outer plates not reaching apex of 2a joint of palp. Gnathopods 1 and 2 as in B. longimanus. Peraeopods 1—5 also nearly as in that species, but differing by having in peraeopods 1—4 a rather bluntly lanceolate, instead of an arcuate finger. Telson quadrangular oval, with a couple of long setae near the lower angles, apical margin slightly concave. L. d 5 mm. Bay of Biscay. Depth 950 m. 16. Gen. Monoculopsis 0. Sars 1892 Monoculopsis (Sp. un.: M. longicornis), G. O. Sars, Crdsk Norway, v.1 p.310. Head produced to a short obtuse rostrum. Side-plates 4 and 5 in O very large. Eyes contiguous within the front of head. Antenna 1 in Q longer than Das Tierreich. 21.Lief.: T.R. R. Stebbing, Amphipoda I. 17 258 Monoeulopsis, Monoculodes antenna 2, 39 joint long, flagellum short. Upper lip rounded quadrangular Lower lip with inner lobes separate. Mandible, molar weil developed, palp slender, 34 joint shorter than 24. Gmathopod 1, process of 5th joint very . large, projeeting. Gnathopod 2 slender, process of 5! joint long, slender, 6t elongate, tapering distally. Peraeopods 1—4 short. stout, very hirsute. Uropods and telson as in Monoculodes (p. 258). 1 species. 1. M. longicornis (Boeck) 1871 Monoculodes I, A. Boeck in: Forh. Selsk. Christian., 1870 p.165 | 1876 M.1., A. Boeck, Skand. Arkt. Amphip., 0.2: p. 273 t.16 f.2 | 1883 M.1., J. S. Schneider in: Tromse Mus. Aarsh., v.6 p.24 t.1 £.7; t.3 f.18, 23 | 1892 Monoculopsis l., G. ©. Sars, Crust. Norway, v.1 p.311 t.110 f£.1 | 1893. Oediceros affinis (part.), A. Della Valle in: F. FI. Neapel, v.20 p. 548. Tumid in front. Head, rostrum very short, triangular, lateral corners subrectangular. Side-plates 1—3 small, 4th as large as 1%t—34 combined, 5th still broader, not so deep. Eyes rounded, light red with whitish coating. Antennae 1 and 2 densely setose. Antenna 1, 24 joint much longer than 18%, 34 subequal to 1%, and to 8-jointed flagellum. Antenna 2 in © a little shorter than antenna 1, ultimate joint of pedunele longer than penultimate, flagellum shorter than those 2 combined. Gmnathopod 1 not strong, process of 5" joint narrowly linguiform, reaching beyond hind margin of oblong oval 6%, which has palm very oblique, subequal to hind margin. Gnathopod 2 long, slender, process of 5!" joint stiliform, reaching beyond palm, 6! joint nearly 5 times as long as broad, distally narrowed, palm small, oblique, well defined. Peraeopods 1 and 2, 4% joint rather expanded, as long as 5tb and 6" combined, finger small. Peraeopods 3 and 4 not long, 24 joint much expanded, 4!" broad, finger short and broad. Peraeopod 5 long, 24 joint broadly oval, 4!" and 5th sub- equal, 6% and 7t% subequal. Uropod 3, rami narrowly lanceolate, spinuli- ferous, a little longer than pedunele Telson. little longer than broad, slightly narrowed to slightly insinuate apical margin. Colour whitish, pale brownish violet on back. L. O0 9 mm. Arctic Ocean, North-Atlantie and North-Sea (Haugesund to Vadsö [Norway], depth 18—36 m; Jan Mayen). 17. Gen. Monoculodes Stimps. 1853 Monoculodes (Sp. un.: M. demissus), Stimpson in: Smithson. Contr., ©. 6 nr.d5 p.54 | 1892 M., G.O. Sars, Crust. Norway, ©.1 p.294 | 1857 Kröyera (Sp. un.: K. carinata), Bate in: Ann. nat. Hist., ser.2 v.19 p.140 | 1858 Kroyera, Bate in: Nat. Hist. Northumb., ©. 41 p. 15 | 1862 Kroyea, Bate, Cat. Amphip. Brit. Mus., t. 17 | 1864 Kroyeria, E. Grube, Lussin, p.72 | 1871 Kroyeria, A. Boeck in: Forh. Selsk. Christian., 1870 p.171. ‘ Head produced to a rostrum, which is usually deflexed, acute. Side- plates 4 and 5 rather large. Eyes almost always contiguous, at base of rostrum. Antenna I generally much shorter than antenna 2, flagellum of latter in © filiform. _Mandible, molar with triturating surface. Maxilla 1, with 9 (6?, 7?) spines on outer plate. Gmathopod 1 (Fig. 65) usually shorter and stouter than gnathopod 2 (Fig: 66), 5th joint of latter produced into a long slender process. Peraeopods, uropods and telson nearly as in Oediceros (p. 243). 18 species accepted, 1 obscure. Monoeulodes Synopsis of accepted species: Eyes separated by carina of head ..... ı Eyes contiguous —- 2. Head narrowly produced behind the eyes — 3. 2 Head not narrowly produced behind the eyes —5. Antenna 1, 2d joint of pedunele much longer than 1st EEE II RER TE FE ER RPER Antenna 1, 2d joint of altaels not longer than 1st — 4. Produced part of head long . .. ... ne Produced part of head short... ..» - .. Rostrum short — 6. Rostrum long — 14. 1 or [e2) Telson a little emärginate —- 9. . Antenna 1 in 2, 2d joint longer than Ist... 7 \ Antenna lin 9, 1st and 2d joints subequal — 8 Gnathopod 2, process of 5th joint overreaching hind margin of 6th; pleon carinate Gnathopod 2, process of 5th joint not over- reaching hind margin of 6th; pleon smooth E- Frontal process abruptly deflexed — 10. Mi r Frontal process not abruptly deflexed — 11. ı Eyes not very large or prominent; side-plate 1 mich -oroRnded.. u ae Eyes large, prominent; side-plate 1 little N 1 EEE EEE Er Peraeopods 1 and 2, 7th joint short — 12. Peraeopods 1 and 2, 7th joint rather long — 13. | | | | | N Telson transversely truncate. — 7. | | | »| | en 1 - 9 Peraeopod 5, 24 joint evenly expanded . Peraeopod 5, 2d joint piriform . . 2.2... | Colouring tessellated; telson apically insinuate 12. M. tesselatus 3 Colouring not tessellated; telson with apex \ decidedly emarginate . . . 2... 2 14 f Antenna 1, 2d joint apically tuberculate. . . 5 \ Antenna 1, 2d joint not apically tubereulate — 15. ’ 5 Eyes large — 16. 4 ® | Eyes not large — 17. E Side-plate 1 little expanded; gnathopod 1, process of 5th joint broad . ». 2.2... Side-plate 1 much expanded; gnathopod 1, process of 5th joint narrow . ...... 16 Gnathopods 1 and 2 rather weak; telson broadly rounded at apex. . . .. vun... Gnathopods 1 and 2 rather strong; telson nar- a 259 1. M. gibbosus . . . . p.259 2. M. hanseni - pP: 260 3. M. longirostris . . p.260 4. M. kröyeri . p. 261 5. M. pallidus ..p. 261 6. M. carinatus. . . . p.261 7. M. griseus. .: .-... p: 262 8. M. borealis . pP. 262 9. M. schneideri . . . p.263 10. M. crassirostris . . p.263 11. M. latimanus . pP. 264 .. p. 264 13. M. simplex . p. 264 14. M. tubereulatus . . p.265 15. M. norvegicus . . . P.265 16. M. subnudus . pP. 266 17. M. packardi . . . . pP. 266 18. M. tenuirostratus . p.267 17° 1. M. gibbosus Chevreux 1888 M.g., Cheyreux in: Bull. Soe. zool. France, v.13 p.4l | 1893 Oediceros affinis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.556 Head with rostrum and pleon carinate. Rostrum large, evenly eurved with high narrow carina, shortly acuminate, reaching apex of 1° joint of, 260 Monoeulodes antenna 1. Side-plate 1 expanded into a lobe in front. Pleon segments 1 and 2 ending dorsally in a median tubercle, segment 3 with a very high gibbous carina. Eyes very large and prominent, oval, at the base of the rostrum, separated by the cephalic carina. Antennae 1 and 2 short. Antenna 1 a little shorter than peduncle of antenna 2, flagellum 5-jointed. Antenna 2, ultimate joint of peduncle much longer than penultimate. Gnathopod 1, process of 5th joint broad, 6'% joint large, ovate, palm not defined. Gnathopod 2, process of 5th joint narrow, reaching beyond the hind margin of 6", which is almost 3 times as long as broad, distally widened. Peraeopods 1 and 2 very hirsute, finger short. Peraeopod 5, 24 joint moderately dilated, hind margin serrate. Uropods 1 and 2 elongate, rami shorter than peduncle. Colour yellowish white, marbled with tawny red. L. © 8 mm. North-Atlantie (lat. 46° N., long. 7° W.). Depth 180 m. 2. M.hanseni Stebb. 1894 M. h., T. Stebbing in: Bijdr. Dierk., v.17 p.23 t.4. Head, frontal process long, horizontal, lateral angles little produced, obtuse. Side-plate 1 distally expanded, 32 with lower margin insinuate, 4" with concave hind margin. Last peraeon segment with faint trace of carina. Pleon segments 1—3 discontinuously earinate; 1° and 24 with many adpressed surface spinules. Eyes contiguous, forming an oval prominence at apex of frontal process, leaving a very small deflexed rostral apex. Antenna 1, 1° joint reaching beyond cephalie process, 29 much longer, flagellum about 11-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate. Upper lip with slightly concave margin. Gmnathopod 1, 5" joint with broad process, scarcely reaching the palm of 6% joint, which is widest at the point where a palmar spine separates the oblique convex palm from the shorter concave hind margin. Gnathopod 2 much longer than gnathopod 1, 5 joint with narrow process, long, but scarcely reaching palm of 6% joint, which widens gradually to the palmar spine, the palm convex, much shorter than the faintly concave hind margin. Peraeopods 1 and 2 very hirsute, 4 joint much widened distally, finger smooth, curved, as long as 6!" joint. Peraeopods 3 and 4 very like 1°t and 24, except that the 24 joint is piriform, the expansion being almost confined to the upper part. Peraeopod 5, 24 joint oval, other joints slender, with small spines. Uropods 1—3, in all peduncle longer than rami, in uropod 3 outer ramus rather shorter than inner. Telson small, a little longer than broad, sides and apex slightly insinuate, some setules on rounded corners of apieal margin. L. © 21 mm. Kara Sea (lat. 72° N. long. 65° E.; Varna, depth 104 m). 3. M. longirostris (Go&s) 1866 Oediceros l., Go@s in: Öfv. Ak. Förh., v.22 p.526 t.39 £.20 | 1893 O.1., A. Della Valle in: F. Fl. Neapel, v.20 p.545 t,58 f.61,62| 1876 Monoculodes l., A. Boeck, Skand. Arkt. Amphip., ©.2 p.270 | 1883 M.1., J.S. Schneider in: Tromse Mus. Aarsh., v.6 p.26 t.1 £.1| 1892 M.1., G.O. Sars, Crust. Norway, v.1 p.306 t.108 £.3 | 1894 M.1., T. Stebbing in: Bijdr. Dierk., v.17 p. 24. Head, frontal process long, horizontal, and the species in general in close agreement with M: hanseni, but without carina, 1°t joint of antenna 1 not reaching end of frontal process, 24 joint not longer than 1%, palm of gnathopod 1 shorter than the hind margin, peduncle of uropod 3 shorter than rami, telson with sides slightliy convex and apical margin straight. Antenna 2 in C with 60—70 joints in flagellum (Boeck). Colour semi- pellueid, whitish, rarely (in adults?) with brownish marbling. L. © 12 mm. Arctie Ocean (Spitzbergen, Finmark, Tromsö); Kattegat. Depth 9—150 m. 5 2 # A £ Monoeulodes : 261 4. M.kröyeri Boeck 1871 M.k., A. Boeck in: Forh. Selsk. Christian., 1870 p. 166 | 1876 M.k. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 t.15 f.5 and 6 in part. (51,m,6i, k,n,r; the rest referring to other species) | 1892 M.k., G. ©. Sars, Crust. Norway, v.l p.305 t.108 £.2| 1894 M.k., T. Stebbing in: Bijdr. Dierk., 0.17 p.24 | 1893 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 550. Body robust, tumid in front. In general like M. hanseni, but without carina, frontal process much shorter, the rostral tip reaching little beyond middle of 1° joint of antenna 1, eyes not very large, 24 joint of antenna 1 not longer than 1°, in antenna 2 ultimate joint of peduncle as long as penulti- mate. Gnathopod 1, palm of 6" joint about equal to hind margin, in gnatho- pod 2 palm very oblique, only a little shorter than hind margin. Peraeo- pods 1—4 unusually expanded, finger rather broad, laminar, shorter than the 6% joint. Telson with convex sides, a little tapering to the truncate apex. L. 9 17 mm. Arctie Ocean (Greenland, depth 11—47 m); North-Sea (Haugesund [Norway], depth 113 m). 5. M. pallidus O. Sars 1892 M.p., G.O.Sars, Crust. Norway, v.1 p.299 t.106 £.3|1893 Oediceros affinis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 938. _ Body rather compressed, but with no distinet carina. Frontal process short with narrow, acute, evenly curved rostrum not reaching apex of 1° joint of antenna 1; lateral corners of head obtuse. Side-plate 1 scarcely expanded. Eyes small, round, imperfectly developed, light red. Antenna 1 in Q longer than peduncle of antenna 2, 24 joint longer than 1°, flagellum shorter than pedunele, 9-jointed. Antenna 2, ultimate and penultimate joints of peduncle sub- equal, flagellum little shorter than peduncle. Gnathopod 1, process of 5" joint narrow, produced beyond hind margin of oval 6!" joint, palm well defined, moderately oblique. Gnathopod 2, slender process of 5!" joint produced much beyond hind margin of narrow 6!" joint, which is more than 3 times as long as broad. Peraeopods 1 and 2, 5t" joint tapering distally, densely setose on convex hind margin, finger short. Peraeopods 3 and 4, finger short, compressed. Peraeopod 5, 24 joint rather broadly oval, 5 little longer than At", Telson quadrangular, apical margin straight. Colour whitish, pellueid. L. © 8 mm. North-Atlantie (Norway). Depth 110--360 m. 6. M. carinatus (Bate) 1856 Westwoodea c. (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 Kröyera carinata, Bate in: Ann. nat. Hist., ser.2 v.19 p- 140 | 1883 Monoculodes carinatus, J. S. Schneider in: Tromse Mus. Aarsh., v. 6 p-19 t.2 f£.4 | 1889 M.c., A.M. Norman in: Ann. nat. Hist., ser.6 v.3 p.447 t.19 £.1—5 | 1892 M. c., G. O. Sars, Crust. Norway, v.1 p.295 t.105 | 1859 Oediceros affinis, R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.93 t.4 f.18 | 1893 O. a. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.548 t.4 f.3; t.38 £.27—31 | 1871 Monoculodes a., A. Bseck in: Forh. Selsk. Christian., 1870 p.164 | 1862 M. carinatus + M. stimpsoni, Bate, Cat. Amphip. Brit. Mus., p. 104 t.17 f£.2; p.105 t.17 £.3. Robust, rather tumid in front. Frontal process strongly vaulted, the short curved rostrum barely reaching apex of 1° joint of antenna 1. Side- plate 1 distally expanded. Pleon segments 1—3 dorsally carinate. Eyes very large, elliptical, purplish with yellowish coating. Antenna 1 in ©, 1° and 24 joints subequal, flagellum shorter than pedunele, S-jointed. Antennal in JG, 24 joint much shorter than 1°, flagellum thickened at base, with some joints densely setose. Antenna 2 in © nearly twice length of antenna 1, ultimate joint of pedunele much longer than penultimate, flagellum equal to the 262 Monoeulodes 2 combined; antenna 2 in C less elongate than usual. Gmathopod 1 (Fig. 65), process of 5th joint densely setose, produced beyond hind margin of oval 6th joint, which has palm very oblique, longer than hind margin, not very sharply defined. Gnathopod 2 (Fig. 66), process of. 5# joint very long and slender, extending a little beyond hind margin of 6% joint, which is more than 4 times as long as broad, palm 6b joint = -/? Fig. 65. short, rather oblique, well 6% joint zu joint M. carinatus. 4 . 59 Fig. 66. M. carinatus. Gnathopod 1. defined. Peraeopods 1—4 Gnathopod 2. [After G. O. Sars.] rather short and stout, [After G. O. Sars.] densely setose, finger ex- tremely small; in peraeopods 1 and 2 6t" joint longer than 5tk, Peraeo- pod 5, 24 joint oval, hind margin irregularly curved, 5t, 6th and 7th joints subequal, each longer than 4, Uropod 3, rami narrowly lanceolate, longer than peduncle, each with about 5 spines. Telson not much longer than broad at the middle, which is somewhat dilated, apical margin straight. Colour yellowish white, mottled with dark brown in transverse bands, the most marked usually on 1° peraeon segment. Ova in pouch rose-coloured. L. 9 11, 9 9; 6—7 mm (Della Valle). North- Atlantic, North-Sea and Skagerrak Shoe Britain, France, Bohuslän, Norway); Kattegat; Gulf of Naples. 7. M. griseus (Della Valle) 1893 Oediceros g., A. Della Valle in: F. Fl. Neapel, v.20 p.551 t.38 f. 16—%6. Back smooth. Frontal process short, deflexed. Side-plate 1 little expanded distally. Eyes oval, oceupying almost all the frontal process. , Antenna 1 longer than peduncle of antenna 2, 1° and 24 joints subequal, flagellum shorter than either, 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle equal. Gnathopod 1, process of 5" joint short, broad, 6" joint oval, palm very oblique, much longer than ‘the obscurely defined hind margin, finger matching palm. Gnathopod' 2, process of 5" joint rather long, just reaching the well defined, rather short and oblique palm; the 6'% joint a little widened at the palm. Peraeopods 1 and 2, finger described as little, not very weak, for peraeopod 2 figured nearly as long as 6% joint. Peraeopods 3—5, finger straight, in peraeopod 4 figured as long as 6% joint, in peraeopods 3 and 5 longer than 6®% In other respects agreeing with M. carinatus (p. 261). L. 5—6 mm. Gulf of Naples. 8. M. borealis Boeck 1866 Oediceros affinis (part.) (err., non Bruzelius 1859)), Goös in: Öfy. Ak. Förh., v.22 p.527 t.39 f.21‘ | 1871 Monoculodes borealis, A. Boeck in: Forh. Selsk. Ohristian.. 1870 p.168 | 1876 M. b. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.278 t.15 an & ?6 | 1883 M. b., J. S. Schueider in: Tromse Mus. Aarsh., v.6 p.22 t.1 f.3 | 1892 M.b., G. O. Sars, Crust. Norway, v.1 p.298 t.106 f.2 | 1893 Oediceros nubilatus (part.), A. DellaValle in: F. Fl. Neapel, v.20 p. 550. Body not very tumid in front, pleon segments 1—3 scarcely carinate. Frontal process moderately large with abruptly deflexed rostrum, apex acute, reaching apex of 1° joint of antenna 1. Side-plate 1 distally expanded. Eyes moderate, rounded, dark red, on genieulation of head. Antenna 1 in 9 reaching just beyond peduncle of Antenna” 2, 1° joint rather longer than 24, flagellum much shorter than peduncle, 8-jointed. Antenna 2, ultimate joint of pedunele 3 E. 3 Monoeulodes 263 shorter than penultimate, flagellum in O as long as those 2 combined. Gnatho- pod 1, process of 5!" joint short, broad, scarcely reaching defining point of oblique palm, which is scarcely longer than hind margin of oblong oval 6% joint. Gnathopod 2, process of 5" joint about or searcely reaching palm of 6% joint, which is about 3 times as long as broad, a little expanded at palm. Peraeopods 1’and 2, 24 joint curved, 24, 4!" and 5!" distally expanded, 5!" short, setose, finger not quite so long as 6", Peraeopods 3 and 4, finger as long as 6th joint. Peraeopod 5 very long, 24 joint piriform, 5" joint longer than 4th, Telson rounded, quadrangular, apical margin slightly insinuated. Colour yellowish white, head retieulated and back transversely striped with dark brown. L. © 10 mm. Arctic Ocean and North-Atlantie (Spitzbergen, Greenland, Siberian Polar Sea, Norway, Scotland). i 9. M. schneideri O.Sars 1895 M.s., G. O. Sars, Crust. Norway, v.1 p. 692 ENIEL Intermediate between M. tesselatus (p. 264) and M. borealis. Body rather slender, pleon segments 1—3 scarcely carinate. Frontal process moderately large with abruptly deflexed rostrum, apex acute, not reaching apex of 1°t joint of antenna 1. Side-plates rather small, 1°' pair little expanded, lower hind corner of 4!" well produced. Eyes very large and protuberant, red, placed at geniculation of head. Antenna 1 reaching end of peduncle of antenna 2, 1% joint of peduncle a little longer than 24, flagellum shorter than peduncle, 8-jointed. Antenna 2 in Q, ultimate and penultimate joints of pedunele subequal, together as long as flagellum. Gnathopod 1, process of 5tt joint 'broad, reaching ill-defined palm of rather small oval 6!" joint. Gmathopod 2, process of 5" joint reaching palm of 6", which is scarcely 3 times as long as it is broad. Peraeopods 1 and 2 rather stout, 5!" joint little expanded, subequal . in length to 6%, finger nearly as long. Peraeopods 3 and 4, finger as long as 6! joint. Peraeopod 5 very long, 24 joint very broad, irregularly round, 5th joint shorter than At, Gt or 7, Telson quadrangular, apical margin very slightly insinuated. Colour variegated with alternating irregular patches of dark brown. L. O0 6 mm. Arctie Ocean (Tromsö). Depth 13—19 m. 10. M. crassirostris H. J. Hansen 1887 M.c., H.J. Hansen in: Vid. Meddel., ser.4 v.9 p.108 t.4 f.5—5f | 1889 M. carinatus?, A. M: Norman in: Ann. nat. Hist., ser.6 v.3 p.450 | 1893 Oediceros affinis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.548. Frontal process short, arched as to upper margin, lower nearly straight, apex acute, not reaching apex of 1° joint of antenna 1. Side-plate 1 distally somewhat expanded. Eyes on the bend of the head, large. Antenna 1 short, 24 joint a little shorter than 1, flagellum short, about 8-jointed. Gnathopod 1 robust, process of 5tk joint broad and rather long, 6 joint quadrangular oval, palm ill-defined, furnished with simple setae, finger touching process of 5th joint. Gnathopod 2, the long slender process of 5t" joint produced beyond the short palm of 6" joint, which is 5 times as long as - its middle width, broadest near base. Peraeopods 1 and 2 short, setose, 24, 4 and 5th joints rather dilated, 6!" scarcely as long as 5t*, finger short, very slender. Peraeopod 3, 24 and 4th joints broad, 5tt much shorter than 4*", finger only half length of 6%". Peraeopod 5, 24 joint much expanded, as broad as long. Telson subrectangular, corners rounded, apical margin insinuate. . Colour whitish, each segment transversely banded with red-brown. L. 8 mm. Arctic Ocean (Greenland). 264 Monoeulodes 11. M. latimanus (Gods) 1866 Oediceros 4, Goes in: Öfv. Ak. Förh., v. 22 p.527 t.39 £.23 | 1893 O.1., A. Della Valle in: F. Fl. Neapel, v.20 p.549 t.58 f.67,68 | 1871 Monoculodes l., A. Boeck in: Forh. Selsk. Christian., 1870 p.168 | 1876 M.1,, A. Boeck, Skand. Arkt. Amphip., v.2 p.279 t.14 f.2| 1883 M.l, J.S. Schneider in: Tromse Mus. Aarsh., v.6 p.öl t.1 f.2 | 1892 M. 1. G. O. Sars, Crust. Norway, v.1 p.304 1.108 f.1. Rather slender and compressed. Frontal process short, not strongly deflexed, apex of rostrum obtuse, scarcely reaching beyond middle of 1° joint of antenna 1. Side-plate 1 distally expanded. Eyes rather small, rounded, dark red, at base of frontal process. Antenna 1 rather short, but longer than peduncle of antenna 2, 1° joint longer than 24, flagellum subequal to peduncle, 10-jointed. Antenna 2, ultimate joint of peduncle slightly shorter than penultimate, flagellum subequal to pedunele. Maxilla 1, outer plate with 9 spines. Gnatho- pod 1, process of 5t" joint very short, 6" joint much widened towards the well defined palm, which is much longer than hind margin. Gmnathopod 2, process of 5t" joint unusually small, scarcely reaching beyond middle of hind margin of large, oblong oval 6% joint, which widens towards well defined large oblique palm. Peraeopods 1 and 2, 24 joint bent, 6" subequal to 5t", finger short. Peraeopods 3 and 4, finger rather more elongate, but not as long as 6" joint. Peraeopod 5, 24 joint piriform, last 4 joints subequal to one another. Telson a little longer than broad, apical margin nearly straight or slightly rounded, carrying 4 spinules. Colour pale yellowish; ova dark violet. L. 7 mm. Arctic Ocean and North-Atlantie (Norway from Namdal northwards, depth 19—94 m; Spitzbergen; Greenland, depth 4—132 m). 12. M. tesselatus J.S. Schn. 1883 M.norvegicus (err., non Oedicerusn. A. Boeck 1861!) J. S. Schneider in: Tromso Mus. Aarsh, v.6 p.21 t.1 £.5; t.3 f.20 | 1884 M. tesselatus, J. S. Schneider in: Tromse Mus. Aarsh., v©.7 p.81 | 1892 M. tessellatus, G. O. Sars, Crust. Norway, v. 1 p.297 t.106 f. 1 | 1895 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.550. Frontal process not greatly produced, San curved, rostral apex reaching apex of 1° joint of antenna 1. Side-plate 1 subrectangular, little expanded. Pleon segments 1—3° scarcely carinate. Eyes large, rounded oval, bright red, at base of frontal process. Antenna 1 in O reaching a little beyond peduncle of antenna 2, 1° joint rather longer than 24, flagellum nearly as long as peduncle, 11-jointed; in J 1° joint of peduncle twice length of 24, flagellum densely setose. Antenna 2 in C as long as body, ultimate joint of pedunele shorter than penultimate (equal to it according to Schneider). Gnathopod 1, process of 5" joint short, broad, not reaching palm, 6% joint oval, palm well defined, about as long as hind margin. Gmathopod 2, process of 5t" joint not more than reaching palm, 6% joint of even width, scarcely more than tbrice as long as broad. Peraeopods 1—4, finger as long as 6% joint; in peraeopods 1 and 2 6% joint scarcely longer than 5". Peraeo- pod 5, 5th joint shorter than 4 or 6%, Uropod 3, peduncle equal to rami in length. Telson shortly oval, apical margin distinetly insinuate. Colour whitish, tessellated with dark brown patches. L. 8 mm. Aretic Ocean (Norway from Kvalö northwards). Depth 38—94 m. 13. M. simplex H. J. Hansen 1887 M.s., H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p.114 t.4 f.6—6h | 1893 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 550. Near to M. tesselatus and M. borealis (p. 262). Frontal process not greatly produced, pretty evenly curved, little deflexed, rostral apex acute, u a re a en mid Monoeulodes 265 about reaching apex of 1° joint of antenna 1. Side-plate 1 a little expanded distally. Eyes of moderate size, at base of frontal process. Antenna 1 reaching considerably beyond pedunele of antenna 2, 1° joint rather longer than 24, joints of flagellum elongate. Antenna 2, ultimate joint of pedunele rather shorter than penultimate. Gnathopod 1, 24 joint not dilated, process of 5th joint apically narrowed, scarcely reaching palm of 6*% joint, palm minutely pectinate and set with setules and numerous little hooks. Gnathopod 2, process of 5!" joint slender and long, yet not quite reaching palm, which is oblique and furnished as in gnathopod 1, 6Fh joint of uniform width. Peraeopods 1 and 2, joints little dilated, finger a little shorter than 6!" jomt. Peraeopods 3 and 4, 24 joint well expanded, the rest not, finger long, nearly straight. Peraeopod 5, 24 joint broad, narrowed distally, 5% rather longer than 4, 6th than 5%, finger longer than 4. Telson a little longer than broad, a little tapering, apical border emarginate more deeply than usual, lateral angles subacute. Colour pale tinged with brown. L. 75 mm (not full grown). Aretic Ocean (Greenland). Depth 19—48 m. 14. M. tuberculatus Boeck 1866 Oediceros affinis (part.) (err., non Bruzelius 18591), Goes in: Ofv. Ak. Förh., v.22 p.527 t.39 f.21 | 1871 Monoculodes tuberculatus, A, Boeck in: Forh. Selsk. Christian., 1870 p. 167 | 1876 M.t., A. Boeck, Skand. Arkt. Amphip., v.2 p.277 t.15 f.2 | 1883 M.t., J. S. Schneider in: Tromss Mus. Aarsh., v. 6 p-29 t.1 f.8 | 1892 M.t., G.O. Sars, Crust. Norway, v.1 p.303 t.107 £.3 | 1893 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 550. Rather stout. Frontal process strongly convex, rostral part large, deflexed, acute, reaching beyond 1° joint of antenna 1. Side-plate 1 distally expanded. Eyes of moderate size, round, bright red, at base of frontal process. Antenna 1 without the plumose setae so commonly present, 1° joint longer than 24, apex of 24 joint produced uniquely into a setose quadrate lobe or tubercle, flagellum rather longer than peduncle, 8-jointed. Antenna 2 scarcely longer than antenna 1, ultimate joint of peduncle shorter than pen- ultimate (equal, according to Schneider), flagellum 16-jointed (Boeck), L1-jointed (Sars in fig.). Maxilla 1, outer plate according to Schneider carrying 7 spines. Gmnathopod 1, process of 5 joint not reaching palm, 6% joint oblong oval, rather curved, palm as long as hind margin. Gnathopod 2 scearcely longer than gnathopod 1, though more slender, process of 5% joint slender, not reaching palm, 6t% joint thrice as long as broad, not widened distally, palm oblique. Peraeopods 1 and 2, 5% joint distally widened, finger about ?/, length of 6%. . Peraeopods 3 and 4, 24 joint broad, 6% much longer than finger. Peraeopod 5, 24 joint piriform, 4" shorter than 5%, 5th than 6b, Uropod 3, rami much longer than pedunele. Telson quadrangular, slightly tapering, apical margin insinuate, carrying 2 spinules, angles rounded. Colour yellowish, with shadows of diffuse orange; ova dark violet. L. 6-8 mm. Arectie Ocean and North-Atlantie (Spitzbergen; Greenland; Norway, depth 94— 188 m; Firth of Clyde). 15. M. norvegicus (Boeck) 1861 Oedicerus n. (part.), A. Boeck in: Forh. Skand. Naturf., Mode8 p.650 | 1871 Monoculodes n., A. Boeck in:*Forh. Selsk. Christian. 1870 p.164 | 1876 M.n., A. Boeck, Skand. Arkt. Amphip., v.2 p.267 t.14 f.5 | 1892 M. n., G.O. Sars, Crust. Norway, v.1 p.301 t.107 £.1 | 1893 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 550. Rather short and stout, though somewhat compressed. Frontal process deflexed, rostral apex acute, reaching beyond 1° joint of antenna 1. Side- 266 Monoeulodes plate 1 little expanded distally. Eyes rather large, oval, dark red, placed at base of frontal process, some way from apex. Antenna 1 reaching beyond peduncle of antenna 2, 1° joint longer than 24, flagellum longer than peduncle, about 12-jointed. Antenna 2 in 9, ultimate and penultimate joints of pedunele sub- equal, together longer than flagellum. Gmathopod 1, process of 5 joint broad, reaching palm, 6% joint oblong oval, slightly curved, expanded distally, palm well defined, scarcely as long as hind margin. Gnathopod 2, process of 5th joint reaching palm, 6! joint nearly 4 times as long as broad. Peraeopods slender. Peraeopods 1 and 2, 5tk joint little expanded, shorter than 6", finger long, but rather shorter than 6% joint. Peraeopod 5, 24 joint piriform, 5t% longer than 4" and slightly longer than 6%. Telson quadrangular, little longer than broad, apical margin scarcely insinuate. Colour persistent, whitish, with transverse bands of reddish brown. L. Q scarcely more than 6 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (South- and West-Norway northwards to Vadsö); Kattegat. Depth 90-376 m. 16. M. subnudus Norm. 1889 M.s., A. M. Norman in: Ann. nat. Hist., ser. 6 v.3 p.450 | 1892 M. falcatus, G. O. Sars, Crust. Norway, ©.1l p.302 t.107 f.2 | 1893 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 550. Near to M.borealis, M.simplex (p. 262, 264) and to M.norvegicus (p. 265). Frontal process evenly curved downward, apex of large rostrum reaching beyond apex of 1° joint of antenna 1. Side-plate 1 considerably- expanded distally. Eyes large, rounded oval, bright red, at base of frontal process. Antenna 1 in O reaching much beyond peduncle of antenna 2, 1° joint as long as 24 and 34 combined, flagellum longer than peduncle, about 13-jointed (Sars). Antenna 1 in ©, 24 joint as long as 1°, 34 half length of 24, flagellum with 11—14 joints (Norman in text, but in figure the 3 joints of peduncle, measure respectively 9, 7, 5 sixteenths of inch). Antenna 2, ultimate joint of pedunele shorter than penultimate (Sars), subequal (Norman), flagellum as long as both combined. Gmnathopod 1, process of 5tk joint reaching palm (Sars), not reaching it (Norman; their figures scarcely distin- guishable), 6% joint narrow oblong, somewhat curved, palm shorter than bind margin. Gnathopod 2, process of 5tk joint not nearly reaching palm (Sars), reaching palm (Norman; in figures the difference is trifling), 6 joint narrow sublinear, more than 4 (Sars; Norman: 5) times as long as broad. Peraeopods less setose than usual (Norman). Peraeopods rather less slender than in M. norvegieus, 5! joint in 1° and 24 slightly expanded, finger comparatively shorter. Telson subquadrate, apical border emarginate, and according to Norman each rounded angle carrying 5 spinules. Colour more or less dark orange (Sars). L. 10 mm. North-Atlantie and Arctic Ocean (Norway to aretie circle, depth 94—188 m; Shetland Islands; Sleat Sound [Isle of Skye]). 17. M. packardi Boeck 1871 M.p., A. Boeck in: Forh. Selsk. Christian., 1870 p- 166 | 1876 M. p., A. Boeck, Skand. Arkt. Amphip., v.2 p.274 t.14 f.3 | 1883 M.p., J.S. Schneider in: Tromse Mus. Aarsh., ©.6 p.27 t.1.£.6 | 1892 M.p., G. O. Sars, Crust. Norway, v.1 p.307 t.109 f.1 | 1898 Oediceros nubilatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 550. Rather slender. Frontal process rather convex, rostral part long, narrow, not reaching end of 1° joint of antenna 1. Side-plate 1 distally expanded. Side-plates in S smaller than in ©. Eyes small, rounded oval, light red, at base of frontal process. Antennae 1 and 2, peduncle elongate. Antenna 1 Monoeulodes, Oediceroides 267 - longer than peduncle of antenna 2, 24 joint as long as 1° or longer, flagellum in O rather shorterthan peduncle, 9-jointed. Antenna 2, ultimate joint of peduncle - nearly as long as penultimate, both densely setose in O, not in C, flagellum in O nearly as long as peduncle, in S-very long, filiform. Lower lip with a single central lobe (Boeck). Maxilla 1, outer plate with 6 spines (Schneider). Gnathopod 1, process of 5" joint short, broad, not reaching palm, 6" joint oblong oval, little expanded distally, palm ill-defined, about as long as hind margin. Gnathopod 2, process of 5t" joint about reaching palm, 6% joint more than twice as long as broad, a little expanded distally, palm ill-defined. Peraeo- pods 1-4, finger, especially in 34 and 4", very long, longer than 6! joint. Peraeopod 5, 24 joint broad above, fringed with delicate setae, 5t" joint shorter than 4", Uropod 3, rami unarmed, about as long as pedunele. Telson oblong oval, little tapering, apically rounded with 2 adjacent spinules. Colour whitish' pellucid, orange on back, antennae banded with orange; ova rose-coloured, L. 7—12 mm. Aretie Ocean, North»Atlantie, North-Sea and Skagerrak (Norway, depth 19—188 ın ; Firth of Clyde, depth 75 m). 18. M. tenuirostratus Boeck 1871 M.t., A. Boeck in: Forh. Selsk. Ohristian., 1870 p. 167 | 1876 M.t., A. Boeck, Skand. Arkt. Amphip., v.2 p.276 t.14 f.4 | 1892 M.t., G.O. Sars, Urust. Norway, v.1 p.309 t.109 f.2 | 1893 Oediceros aequicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 545. Nearly allied to M. packardi. Frontal process evenly curved, rostral part very long and narrow, nearly reaching apex of 1°t joint of antenna 1. Side-plate 1 distally expanded. Eyes at base of frontal process, faint in aleoholie specimens. Antennae 1 and 2 elongate. Antenna 1, 29 joint much longer than 1°, flagellum shorter than pedunele, 12-jointed. Antenna 2 in © scarcely longer than antenna 1, ultimate joint of pedunele shorter than pen- ultimate, flagellum shorter than peduncle. Gnathopods 1 and 2 much stronger than in M. packardi. Gmnathopod 1, process of 5t joint large, broad, very setose, reaching palm, 6" joint widened distally, palm well defined. Gnatho- pod 2, process of 5t" joint reaching palm, 6!" joint scarcely more than twice as long as broad, widened distally, palm about as long as hind margin. Peraeopods nearly as in M. packardi. Telson oval triangular, strongly tapering to obtuse point with 2 spinules. L. O0 8 mm. Christianiafjord [Norway], North-Atlantie. M. demissus Stimps. 1853 M.d., Stimpson in: Smithson. Contr., ©. 6 nr.5 p.54 | 1893 M.d., A. Della Valle in: F. Fi. Neapel, v.20 p. 556. L. 9 mm. Fundy Bay (Duck Island, Grand Manan). Depth 7 m. 18. Gen. Oediceroides Stebb. 1888 Oediceroides, T. Stebbing in: Rep. Voy. Challenger, v.29 p.843 | 1892 O., G. 0. Sars, Crust. Norway, v.1 p. 287. Head with frontal process conspicuously developed (Fig. 67). Side- plates not very large, 1° expanded distally, produced forward. Eyes, when present, elongate, contiguous, on frontal process. Antenna 1 much shorter than antenna 2 (Fig. 67). Mouth-parts nearly as in Oediceropsis (p. 252), but inner plate of maxilla 1 more strongly developed, carrying from -3—8 plumose setae, outer plate with 9 spines. Gnathopods 1 and 2 nearly 268 Oediceroides n - alike, powerful, 5!" joint distally expanded into a broad setose process, 6'h elongate oval or squarish, palm longer than hind margin. 4 species. Synopsis of species: | Eyes represented only by a pigment mas. ... . 1. O. rostratus . p.268 1 Eyes not represented Eyes distinet — 2. uf Back without tubereles a Da NE a EN re 2. O. proximus . p.269 ae 3. O. cinderella . p. 269 4. O. ornatus . . p.270 1. ©. rostratus (Stebb.) 1883 Oediceropsis rostrata, T. Stebbing in: Ann. nat. Hist., ser. 5 v.11 p. 204 | 1888 Oediceroides r., O. conspicua, T. Stebbing in: Rep. Voy. > 4] ZI I -4= S Syyunpr Fig. 67. O. rostratus. Rostrum and antennae. —— Flagellum Challenger, v. 29 p. 844; p. 547 t.60, 61 | 1893 Halimedon rostratus, A. Della Valle in: F. Fl. Neapel, v.20 p. 540 t. 58 #. 46—49. Body finely pubescent, peraeon segments 1—6 transversely furrowed, segment 7 and pleon segments 1—4 tuberculately keeled. Side-plate 4 deeply emarginate behind. Frontal process (Fig. 67) arcuate, reaching middle of 24 joint of antenna 1, prismatie in cross section, with a little boat-shaped rostral apex, lateral corners of head acute, postero-antennal rounded. In place of eyes, frontal process filled with a bifid mass of granular bright red pigment. Antenna 1 (Fig. 67) reaching little beyond penultimate joint of peduncle of antenna 2; 1°joint as long as 24 and 34 combined, flagellum 21-jointed, hirsute, tapering. Antenna 2 (Fig. 67), ultimate joint of peduncle shorter than penulti- mate, both stout, setulose, armed with long spines, flagellum shorter than pe- duncle, tapering, of 65 joints, most with calceoli, or peduncle without long spines, flagellum longer than peduncle, of 74 joints, without calceoli Upper lip transversely- oval, a little projecting at centre. Mandible, eutting plates distinetly denticulate. Maxilla 1, inner plate with 8 plumose setae, 24 joint of palp with many spiniform setae about apex. Maxilla 2, inner margin of inner plate entirely fringed with setae. Gmathopods 1 and 2, 5th joint shorter but broader than oval 6", considerably so in gnathopod 2, in which the 6% joint is little broader, but considerably longer than in gnathopod 1, palm long, feebly defined. Peraeopods 1—4 setose, finger nearly as long as 6h joint, with cap over the nail. Branchial vesicles in peraeopods 1 and 2 very large, lightly erumpled. Peraeopods 3 and 4, 4 joint as long as 24 or Oediceroides 269 longer, both very setose. Peraeopod 5, 24 joint piriform, large, but not longer than 4", which is a little longer than 5th or 6%, all the three spinose; the finger straight, as long as 5!" or 6t% joint, with slender spines or setae fringing both margins. Uropod 3, rami rather longer than peduncle, subequal, lanceolate, spinulose and partly pectinate. Telson small, subquadrate, sides convex, apical border emarginate. L. 18—31 mm. Southern Indian Ocean (Cumberland Bay [Kerguelen Island], depth 223 m; Heard Island, depth 274 m). a 2. O. proximus Bonnier 1896 O.proxima, J. Bonnier in: Ann. Univ. Lyon, v.26 p. 640 t.38 £.1. Pleon segments I—3 dorsally covered with little conical tubercles, close set, produeing a downy appearance. Head, frontal process or rostrum acute, scarcely longer than 1° jeint of antenna 1, lateral corners rounded. Side-plate 1 distally expanded and produced, 4" dilated in front, hind margin almost straight. Eyes entirely wanting. Antenna 1 rather longer than peduncle of antenna 2, 1° joint longer than 24 and 34 combined, flagellum longer than peduncle, with 17 short thick joints. Antenna 2, ultimate joint shorter than thick penultimate, flagellum long, 64-jointed. Mouth-parts nearly as in O. rostratus; maxilla 1 with 6 setae on inner plate, outer with 8 spines. Gmathopod 1, 5th joint distally expanded, spinose, shorter than oval 6%, in which palm is finely erenulate, longer than hind margin, defined by a palmar spine, finger as long as palm. Gmnathopod 2, 5% joint distally produced, though not to end of hind margin of 6%, which is longer not wider than in gnathopod 1. Peraeopod 1, 6% joint narrow at the extremities, dilated at middle of setose front margin. Peraeopods in general like those of O. rostratus. Uropod 3 not known. Telson oval, with 2 spinules and 2 setules at the rounded apex. L. d 7 mm. Bay of Biscay. Depth 650—950 m. 3. O. cinderella Stebb. 1888 O. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.850 t. 62, 63 | 1895 Halimedon e., A. Della Valle in: F. Fl. Neapel, v.20 p. 540 t.58 f.45—45. Back a little imbrieated. Side-plate 1 greatly expanded and produced forward, 4% slightly excavate behind. Frontal process deflexed, nearly reaching apex of 1° joint of antenna 1, prismatie in section; lateral corners of head subacute, postero-antennal corners rounded. Eyes long, narrow, nearly reaching blunt apex of frontal process. Antenna 1, 1° joint longer than 24, 24 nearly twice as long as 34, all with plumose setae, flagellum slender, probably not long. Antenna 2, ultimate joint of peduncle much narrower than penultimate, about as long, armed with large spines, flagellum of 54 joints, most with calceoli. Upper lip smoothly rounded. Mandibular palp, 24 joint decidedly longer than 34, Maxilla 1, inner plate with 3 plumose setae. Maxilla 2, inner plate not wholly fringed with setae. Gmnathopods 1 and 2, 5th joint as broad as long, shorter than 6t%, 6 Jonger than broad, the long convex palm forming a very deeided angle with the much shorter hind margin, this joint being longer, but not broader in gnathopod 2 than in gnathopod 1, finger long and curved. Peraeopods 1--4 moderately setose, finger boat-shaped, in peraeo- pods 1 and 2 a little shorter, in peraeopods 3 and 4 a little longer than the 6*b joint, a cap over the nail. Branchial vesieles with accessory lobe at base. Peraeopods 3 and 4, 24 joint not broadly oval, in peraeopod 4 shorter than 4b joint. Peraeopod 5, 24 joint broad oval, longer than 4th, 5th or 6th, 270 Oediceroides, Oedicerotidarum species incerftae sedis, Synopiidae . which are subequal. Telson small, rounded oval, with spinules and plumose setules on rounded apex. L. 15 mm.’ South-Atlantie (Falkland Islands). Depth 1893 m. 4. O. ornatus (Stebb.) 1883 Acanthostepheia ornata, T. Stebbing in: Ann. nat. Hist., ser.5 o.11 p.203 |! 1888 Oediceroides o., T. Stebbing in: Rep. Voy. Challenger, v.29 p.855 t.64 | 1893 Halimedon ornatus, A. Della Valle in: F. Fl. Neapel, v.20 p. 536 t.58 f. 33—35. 5 Back imbricate and diseontinuously carinate, with large medio-dorsal tubereles, and on peraeon and pleon segments 1 and 2 smaller läteral ones, hind margin of peraeon segments I—7 and pleon segment 1 fringed with small tubereles. Side-plate 1 much produced forward, 4! excavate behind. Head dorsally ridged, with conspieuous frontal process, constrieted at base, prismatic in cross section; lateral corners rounded. Eyes long, separated only by the narrow carina, occupying frontal process to its acute tip, remaining dark in spirit, ocelli numerous. Antenna 1, pedunele slender, short, 1° joint longer than 24, 34 feeble, suggesting that the missing flagellum is small. Antenna 2, penultimate joint of pedunele much longer than ultimate, 1° joint of flagellum carrying ‚a calceolus, rest missing. Upper lip, distal margin broad. Lower lip, outer lobes very broad, character of inner not clearly ascertained. Mandible, 24 joint of palp a little longer than 34. Maxilla 1, inner plate very large, with 5 setae. Maxilla 2, inner margin of inner plate wholly fringed with setae. Gnathopods 1 and 2, 5tk joint shorter than 6'%, with a rather massive setose or spinose lobe, 6th oval, broadest at base, the very long setose palm moderately defined from the short hind margin. Peraeopods 1—5 all more or less broken, what remained showing the characters usual in the family. Uropod 3 not as long and not reaching so far -back as uropods 1 or 2; rami lanceolate, spinose, a little longer than peduncle. Telson small, oblong, . slightly narrowing to the scarcely emarginate apieal border. L. © 15 mm. Bass Strait (East Moncoeur Island). Depth 70 m. Oedicerotidarum species incertae sedis. Oedicerus novi-zealandiae Dana 1853 &55 O. n., J.D. Dana in: U.S expl. Exp., v.1311 p. 934 t.63 f.7a—h | 1861 ©. n., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.650 | 1862 O. novae-zealandiae, O. novi-zealandiae, Bate, Cat. Amphip. Brit. Mus., p. 104 t.17 £.1] 1876 O. novae-zealandiae, Miers, Cat. Crust. N. Zealand, p. 126 | 1886 O. neo-zelaniceus, (G. M. Thomson &) Chilton in: Tr. N. Zealand Inst., v.18 p. 149. Generically near to Exoediceros (p. 239), but with finger on peraeopods 1 and 2 well developed. Colour greenish. L. 4 mm. South-Paeifie (New Zealand). Rock-pools. 20. Fam. Synopiidae 1853 Subfam. Synopinae, J.D. Dana in: U.S. expl. BED v.1311 p. 981 | 1886 Synopidae, Bovallius in: N. Acta Soc. Upsal., ser.8v.13 nr. 9 p.3 | 1888 S., T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 798. Integument thin, pellueid. Head klansulee. not inflated, produced over bases of antennae 1 and 2. Side-plate 3 the largest. Eyes large, coalesced at top of head, usually with small lateral pair below. Antenna 1 shorter than antenna 2, peduncle short, 1°* joint of flagellum large, accessöry flagellum Kr Fall a Ze nr > ae nn nl dr u A da Synopiidae, Synopia 271 rather long. Upper lip bilobed. Mandible normal, but 24 joint of palp large, 34 minute. Maxilla 1, inner plate with several setae, outer with 8 spines, 24 joint of palp with spine-teeth on apex. Maxilla 2, inner plate broader than outer, fringed on inner margin. Maxillipeds strongly setose, inner plates rather short, rounded at apex, outer long, narrow, 4" joint of palp very small. Gmnathopod 1 scarcely subchelate (Fig. 68), gnathopod 2 simple (Fig. 69). Peraeopods 1 and 2 with 4% and 5t% joints dilated. Peraeo- pods 3—5, 24 joint expanded. Uropods 1 and 2, outer ramus shorter than inner, uropod 3 reaching furthest back, outer ramus the longer, 2-jointed. Telson cleft. Marine. 1 genus, 2 species accepted, 3 doubtful. 1. Gen. Synopia Dana 1852 Synopia, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.315 | 1853 S., J.D. Dana in: U.S. expl. Exp., v.131r p.994 | 1871 S., Claus in: Nachr. Ges. Götting., p. 157 | 1886 S., Bovallius in: N. Acta Soc. Upsal., ser.8 v.15 nr.9 p.4 | 1888 $., T. Stebbing in: Rep. Voy. Öhallenger, v.29 p.799 | 1893 S., A. Della Valle in: F. Fl. Neapel, v.20 p. 850. With the character of family. 2 species accepted, 3 doubtful. Synopsis of accepted species: EOlNOn SOMOWlDE FISngulär. ı 2 u see ni 1. S. ultramarina . p.271 Ba nee en an 2 Bu Bahserleane..... 1: 278 1. S. ultramarina Dana 1853 &55 S.u.-+-S. gracilis, J. D. Dana in: U.S. expl. Exp., v.131r p. 995; t.68 f.6a—h, 7a—e | 1862 $.u., Bate, Cat. Amphip. Brit. Mus.. p.341 t.54 f.1 | 1886 $. u., Bovallius in: N. Acta Soc. Upsal., ser.3 v.13 nr. 9 p-6 t.1 | 1893 S. u. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 851. Body and front of head sharp-edged, peraeon segments 1—7 short, pleon segments 1—3 long and large. Front of head at right angles to dorsal line. Side-plates 1 and 2 small, slightly bent forward, 3% far larger, quadrangular, emarginate behind, 4" not large, triangular, with the longest side arcuate, 5th—7th small; pleon segments 1—3, postero-lateral corners subquadrate. Eye seemingly variable, round or oval, especially perhaps in 9, the little lateral eyes having 3 or 4 lenses, colour continuing dark in spirit. Antenna 1, flagellum in © with 5 jeints, in G with 10—14, in both 1°* long, tapering, more or less fringed, accessory flagellum 2-(Dana: faintly 3-)jointed, a little longer or shorter than 1° of primary, the terminal joint minute. "Antenna 2, ultimate joint of peduncle much shorter than penultimate, flagellum in © with 12—14 joints, in d with 18. Triturating lobes of stomach fringed with very slender spines. Gmathopod 1, 24 joint rather widened distally, 5th joint large and long, narrow at the extremities, fringed on hind margin with long plumose spines or setae, 6!" very -much smaller, broadiy ovate, fringed on part answering to palm with plumose spines or setae, finger nearly as long as 6tk joint, slender, slightly curved, scarcely intended to close against any palm margin, since the equivalent of the palm is clothed as above mentioned. Gnathopod 2 much more slender, 5" joint long and narrow, 6{h also narrow, more than half as long, both fringed on hind margin 272 Synopia with long spines, finger small, with a nail nearly as long as the base. Peraeopod 1, 24 joint widened distally, 4 and 5t" joints broad, subequal, the 5th oval, fringed on hind margin, 6% sublinear, rather shorter than 5t, finger more than half length of 6, the base more than twice as long as the little nail. Peraeopod 2 differing from peraeopod 1, 4" joint broad, rather cup- like, much shorter than the broadly oval densely fringed 5th, 6tk narrowly oval, about half as long and broad as 5", slightly armed, finger as in peraeopod 1. Peraeopods 3 and 4, 24 joint a very broad oval, the hind wing so transparent as easily to escape observation, 6% joint subequal in length to 24, longer than the other joints, finger long and straight. Peraeo- pod 4 rather longer than peraeopods 3 or 5. Peraeopod 5, 24 joint with straight front, hind margin produced downward, forming a subangular lobe, finger shorter than in peraeopods 3 and 4. Pleopods have 2 cleft spines on 1° joint of inner ramus. Uropod 1 much longer than uropod 2, its pedunele much longer than pedunele of uropod 3, but its rami shorter. Telson reaching distinetly beyond peduncle of uropod 3; triangular, obliquelv truncated behind, divided beyond the middle (Bovallius), or, triangular with a tendency to oval, cleft to the middle, the apices notched, with the outer tooth rather more produced than the inner. Colour rich blue to hyaline, tinted in parts with blue. L. 4—6 mm. Tropical Atlantie (lat. —12° S., long. 11—25° W.). 2. S. scheeleana Bovall. 1886 S.s., Bovallius in: N. Acta Soc. Upsal., ser. 3 v.13 nr.9 p.16 t.2 f.22—29 | 1888 S. s., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 799 t.52 | 1893 S. ultramarina (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 851. Very near to S. ultramarina (p. 271), but antenna 1 more elongate and telson differently shaped. Eye large, oval, sometimes narrowly prolonged backward, about 30 lenses; lateral eyes of 4 lenses. Antenna 1, flagellum in S with 16—20 joints, 1t]ong, closely fringed, accessory flagellum equal to it ora little shorter, its 24 joint minute, tipped with a setule. Antenna 2, flagellum 20-jointed. Uropod 2, outer ramus totally smooth along both margins (Bovallius) or finely peetinate along upper margin (Stebbing), inner ramus with 2 spines (Bovallius) or 1 spine (Stebbing) on inner margin. Telson broadly ovate, reaching Fig. ’68. : ; Fig. 69. ee little beyond peduncle of uropod 3, ceft a Gnathopod ı. about to centre, sometimes beyond, sometimes Gnathopod 2. falling short of it, apices rounded, slightly notched, inner point equally advanced with outer or falling short of it. Colour hyaline. L. 4-6 mm. : Tropical Atlantie and Paeifie. S. angustifrons Dana 1853 &55 $.a., J. D. Dana in: U. S. expl. Exp., v. 1311 p. 998; t.68 f.8a—d | 1886 S.a., Bovallius in: N. Acta Soc. Upsal., ser.3 v.13 nr.9 p.20 t.2 f. 36—839 | 1893 8. ultramarina (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.851. Antenna 1 short, flagellum 5-jointed. Antenna 2, flagellum 10-jointed. L. 3 mm. Tropical Paeifie (lat. 18% S., long. 122° W.), ”. Se Synopia, Tironidae 273 S. caraibica Bovall. 1886 S.c., Bovallius in: N. Acta Soe. Upsal. „ser.3 v.13 ar.9 p.14 t.2 £.30 | 1893 8. ultramarina (part), A. Della Valle in: F. FL. Neapel, 2.20 p. 851. L. 5 mm. Caribbean Sea. S. orientalis Kossm. 1880 S.o., Kossmann in: Reise Roth. Meer, v.2ı Malaecost. -p.137 t.15 £. 11-13 | 1886 S.o., Bovallius in: N. Acta Soc. Upsal., ser.3 v.13 nr. 9 p-21 | 1893 8. ultramarina (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 851. L. 3mm. Red Sea. 21. Fam. Tironidae 1871 Subfam, Syrrhoinae, A. Boeck in: Forh. Selsk. Christian., 1870 p.146 | 1888 Syrrhoidae, 'T. Stebbing in: Rep. Voy. Challenger, v.29 p. 787 | 1893 PR 2 0. Sars, Urust. Norway, v.1l P- 388. Pleon well developed. Head usually produced into a deflexed rostrum. Side-plate 4 (except in Argissa, Fig. 70 p. 276) not conspicuously large, often smaller than 39, Eyes of various characters. Antenna 1 with accessory flagellum, peduncle longer, fagellum shorter in 9 than in d; antenna 2 little or not longer than antenna 1 in O, eonsiderably longer in d. Lower lip (Fig. 71 p. 278), with inner lobes. Mandible robust, but palp slight, usually with very short 34 joint. Maxilla 1, inner plate with several setae, outer with (so far as known) 11 spines, 2@ joint of palp long. Maxilla 2, inner plate rather the broader, fringed on inner margin. Maxillipeds normal. Gmathopods 1 and 2 feeble, slender, not: very unequal, 5tk joint long, 6! shorter, subchelate or simple. Peraeopods 1 and 2 slight. Peraeopod 5 usually the longest. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami subequal. Telson long, cleft (except in Bruzelia, p. 274). > Marine. 7 genera, 13 accepted species, 1 doubtful. Synopsis of genera: 1 Ra aa 1. Gen. Bruzelia . . . p.274 \ Telson deeply cleft — 2. : ” DE BR ee a a RE le 2. Gen. Tiron . ... . p.275 \ Eyes two, coalesced or separate, or none — 8. j Side-plate 4 larger than 34 (Fig. 70) — 4. \ Side-plate 4 not larger than 3d — 5. | Mandible, molar large; maxillipeds, outer plates 4 GE monerate Be net, 3. Gen. Argissa . . . P.276 ] Mandible, molar very small; maxillipeds, outer Dlatevary large: Sa RE 4. Gen. Astyra. . . . p.278 „ f Side-plate 3 not greatly expanded distally . . 5. Gen. Syrrhoites . . p.279 ° -) Side-plate 3 greatly expanded distally — 6. 6 f Gnathopods 1 and 2 subehelate . ... . ... . 6. Gen. Syrrhoe . . . p.281 \ Gnathopods Land 2 simple .. .... 2... 7. Gen. Pseudotiron . p. 284 Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 18 274 Bruzelia 1. Gen. Bruzelia Boeck 1871 Bruzelia (Sp. un.: B. typica), A. Boeck in: Forh. Selsk. Christian., 1870 p-149 | 1876 B., A. Boeck, Skand. Arkt. Amphip., v2 p.477 |1893 B., G. O. Sars, Crust. Norway, v.1 p.394 | 1893 B., A. Della Valle in: F. Fl. Neapel, v.20 p. 667. Body stout, indurated. Head, rostrum deflexed, lateral corners broadiy rounded. Side-plate 3 slightly expanded below, 4" shorter, deeply excavate behind. Pleon segments 1—3 large, 22 and 34, postero-lateral angles acute. Eyes rudimentary. Antenna 1 rather short, aecessory flagellum 2- or 3-jointed. Antenna 2 in O rather, in 9 much longer. Upper lip carinate, broad, narrowing to truncate apex. Lower lip, inner lobes partially coalesced with outer. Mandible compact, cutting edge obscurely dentate, little prominent, molar large, not prominent, palp slender, 34 joint not or scarcely longer than 1%. Maxilla 1, inner plate with 10 setae, outer with 11(?) spines, palp long. Maxilla 2, inner plate broader than outer, fringed on inner margin. Maxillipeds, inner plates broad, outer reaching beyond middle of palp’s 24 joint, fringed with spines on inner margin, finger of palp small. Gmatho- pods 1 and 2 similar, but 24 longer and thinner than 1%, 5th joint long, 6" short, palm oblique, armed with a strong denticulate spine. Peraeopods 1 and 2 very slender. Peraeopods3—5 stronger, 5% subequal to 4%, Uropodl, rami narrow, unequal; uropod 2, pedunele short, outer ramus narrow and short, inner long, broadiy lanceolate, unarmed; uropod 3, rami narrow, outer with spiniform terminal joint. Telson large, broadly lanceolate, entire. 2 species. Synopsis of species: Rostrum spatuliform, peraeon smooth . ..» » 2 .... 1. B. typica. . . . p.274 Rostrum acuminate, peraeon segments 3—7 tubereulately VBFTIIREO N TEE EU ES ESTER 2. B. tuberculata . p.275 1. B. typiea Boeck 1871 B.t., A. Boeck in: Forh. Selsk. Christian., 1870 p. 150 | 1876 B.t., A. Boeck, Skand. Arkt. Amphip., v2 p.478 t.10 £.3| 1898 B. t., G.O. Sars, Crust. Norway, v.1 p.395 t.138, t.139 f.1| 1893 B.t., A. Della Valle in: F. Fl. Neapel, v.20 p. 668 t.59 £. 76. Body extremely broad, subdepressed, back of peraeon vaulted above, lateral edges forming abrupt angle with side-plates. Pleon segments 1—3 dorsally carinate, produced to upturned point on segment 3, segments 4—6 smooth in oO, in d segments 5 and 6 armed with a dorsal projection, that on segment 5 narrow linguiform, abruptly deflexed, ending in 2 setules. Head, rostrum apically abruptly deflexed and obtusely rounded, not reaching apex of 1°t joint of antenna 1. Side-plates 1—3 slightly widened distally, 5" and 6!" much broader than deep, hind lobe angular below. Eyes represented by an irregular patch of chalky white pigment. Antenna 1 in ©, 1° joint bent, stout, little longer than 24, 34 more than half as long as 24, flagellum scarcely as long as peduncle, with 8 joints, accessory flagellum small, 2-jointed; in S 1° joint of flagellum very large, densely filamented, accessory flagellum large, 3-jointed. Antenna 2 in 9 rather longer than antenna 1, ultimate and penultimate joints of peduncle subequal, long, flagellum little more than half as long as peduncle, 7-jointed, in d filiform, very long, with about 12 long joints. Gnathopod 1, 5t® joint nearly twice as long as 6tk, 6th oblong oval, palm subequal to hind margin, defined by obtuse angle, the denticulate spine as in Syrrhoe erenulata (p. 282). Gnatho- pod 2, 5th and 6t% joints narrower and longer. Peraeopods 1 and 2, 5tk joint longer than 4!" or 6*h, fringed distally with long setae. Peraeopods 3—5, wu Bruzelia, Tiron 275 24 joint narrowly oblong, hind margin smootb, 4" joint rather large, wide above, acutely produced. Uropod 3, outer ramus 2-jointed, a little shorter than inner, in © unarmed, in JS both rami fringed with plumose setae on inner margin. Telson about twice as long as broad at base, distally tapering rapidly, subacute apex minutely bidentate. Colour dark yellowish. 'L. about 6 mm. Arctic Ocean, North-Atlantie, North-Sea and Skagerrak (Norway northward to Lofoten Islands). Depth 150-—564 m. 2. B. tuberculata O. Sars 1882 B.t., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p- 95 t.4 f.7 | 1893 B.t., G. O. Sars, Crust. Norway, v.1 p.397 t.139 f.2 | 1893 B. t., A. Della Valle in: F. Fl. Neapel, 0.20 p.668 t.59 f.75. Body ratber stout and compact. Peraeon segments 3—7 and pleon segments 1—3 dorsally raised to obtuse tubereuliform processes. Lateral .margins of peraeon segments ‚forming keels, which are continued on pleon segments 1 and 2, and there produced into small teeth. Pleon segments 4—6 dorsally smooth. Head, rostrum almost vertically deflexed, acuminate, over- lapping 1° joint of antenna 1. *Side-plates smaller than in B. typica. Pleon segment 3, postero-lateral angles more hook-like, with lower margin coarsely serrate. Eyes represented by rounded patch of whitish pigment at base of rostrum. Antenna 1 in O, 1° joint slightly curved, flagellum shorter than pedunele, 6-jointed, accessory flagellum as long as the 1° joint of flagellum, 2-jointed. Antenna 2 in Q rather longer than antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum about half as long as peduncle, 6-jointed. Gnathopods 1 and 2, peraeopods 1 and 2 as in B. typica. Peraeopods 3—5 rather strong, not very unequal, 24 joint serrate on hind margin and in peraeopod 5 very broadly oval, 4! joint also much expanded above. Uropods 1 and 2 nearly as in B. typica; uropod 3, rami scarcely longer than peduncle, both unarmed. Telson more than twice as long as broad, slightly constrieted near base, distally tapering to an acute simple point. Colour light yellowish with large irregular patches of diffuse briek-red. L. © 6 mm. Arctie Ocean and North-Atlantie (Lofoten Isles, Bejan in. Trondhjemsfjord). Depth 188—564 m. 2. Gen. Tiron Lillj. 1865 Tiron (Sp. un.: T. acanthurus), W.Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.6 or.1 p.19 | 1876 T., A. Boeck, Skand. Arkt. Amphip., v.2 p.475 | 1893 T., G.O. Sars, Crust. Norway, v.1 p.398 | 1893 T., A. Della Valle in: F. Fl. Neapel, v.20 p. 693 | 1866 Syrrho& (part.)?, Goes in: Öfv. Ak. Förh., v.22 p.527 | 1868 Tessarops (Sp. un.: T. hastata) (non Rafınesque 1821, Arachnoidea!), A.M. Norman in: Ann. nat. Hist., ser.4 v.2 p.412. Body not robust or indurated. Head, rostrum of moderate length. Side-plate 4 less deep than 34. Eyes 4, a subdorsal pair, and a minute lateral pair. Antenna 1 with long accessory flagellum: Antenna 2 longer than antenna 1. Upper lip rounded, bilobed, carinate. Lower lip with inner lobes. Mandible normal, molar large and prominent, palp slender, 34 joint scarcely longer than 1%. Maxilla 1, inner plate with many setae, outer with 11(?) spines, . palp long. Maxilla 2, inner plate fringed on inner margin, outer rather narrower. Maxillipeds normal. Gnathopods 1 and 2 long, setose, 5!" joint narrow, much longer than the linear simple 6%, finger small. Peraeopods short and stout, 29 joint much expanded in peraeopods 3—5, especially in ı18* pe 276 Tiron, Argissa peraeopod 5. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami long, lanceolate, subequal, outer. with small 29 joint. Telson narrow, very long, deeply cleft. l species. 1. T. acanthurus Lillj. 1865 T.a., W. Lilljeborg in: N. Acta Soe. Upsal., ser. 3 c.6 nr.1 p.19 | 1876 7. a., A. Boeck, Skand. Arkt. Amphip., v.2 p.475 t.9 £.8; t.13 £.1 11898 T.a., 6.0. Be Crust. Norway, ®.1 p.399 t.140 | 1893 T.a., A. Della Valle in: F. Fl. Neapel, v.20 p.693 1.60 f.1 | 1866 Syrrhoe [?] bieuspis, Go&s in: Öfv. Ak. Förh., v.22 p.528 t.40 f.26 | 1868 Tessarops hastata, A. M. Norman in: Ann. nat, Hist., ser. 4 v.2 p.412 1.22 f.4—7. Pleon segments 1—3 dorsally serrate, with about 10 teeth, segments 4+—6 dorsally produced to conically pointed process, smallest on segment 6. Head, rostrum reaching about middle of 15 joint of antenna 1, lateral corners nearly quadrate. Side-plates 1—3 rather narrow, distally erenulate, setose, 4!" slightly emarginate, obtusely triangular below, 5tt and 6", hind lobe deep, rounded. Pleon segment 3, postero-lateral angles minutely produced. Upper eyes rounded, dark red. Antenna 1 in oO, 1% joint nearly as long as 24 and 34 combined, flagellum longer than peduncle, 10-jointed, accessory flagellum half as long, 5-jointed. Antenna 2 in 9 much longer, ultimate joint of peduncle shorter than penultimate, flagellum half as long as pedunele, 9-jointed. Antenna l in J, 18 joint longer than 24 and 34 combined, flagellum more than twice as long as peduncle, 1° joint very long, densely fringed. Antenna 2 ind, flagellum longer than peduncle, 15-jointed. Gnathopods 1 and 2, 5t" joint distally narrowed, ‘more than twice as long as 6", the small finger 2-jointed. Peraeopods 1 and 2, 4 joint longer than 5th or 6, finger small. Peraeopods 3—5 much stouter, 4 joint much larger than 6", especially in the 5tb pair. Uropod 3 reaching much beyond uropods 1 and 2, spinules- and setae on the rami more developed in C than in 90. Telson cleft nearly to the base, gradually tapering, apices acute, contiguous. Colour dark reddish brown, antennae banded with brown. L. Q 8, G 9 mm. Aretie Ocean, North-Atlantie, North-Sea and ag (Greenland, NONE: ‘Great Britain); Kattegat. Depth 38—113 m. 3. Gen. Argissa Boeck 1871 Argissa (Sp. un.: A. typica), A. Boeck in: Forh. Selsk. Christian., 1870 p.125 ı 1891 A., G. O. Sars, Orust. Norway, o.1 p.140 | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p.686 | 1890 Chi- maeropsis (Sp. un.: ©. danica) (non Zittel 1887, Pisces!), Meinert in: Udb. Hauchs, v.3 p. 167. Body (Fig. 70) compressed. Head not or little rostrate. Side- plates decreasing from 1° to 34, 4th Jarge, shield-like, little ex- cavate. Antenna 1 shorter than antenna 2, accessory flagellum small, with 2 joints, 24 minute. Fig. 70. A. halnatipes, ?. No calceoli. Upper lip slightly Lateral view. [After G.O. Sars.] notched. Mandible, euttin g ed ge and accessory plate dentate, many spines in spine-row, molar strong, palp slight, 34 joint longer than 24, Maxilla 1, inner plate with 2 or 3 setae, 24 joint TE vos a Argissa 277 of palp distally widened. Maxilla 2, inner plate with lateral armature. Maxillipeds, plates moderate, outer with apical spines, inner margin simple, 4th joint of palp spiniform. Gmathopods similar, not subchelate, 6 joint slender, much shorter and narrower than 5th, finger slender, feeble. Peraeo- pods 1 and 2 very small. Peraeopods 3 and 4, 24 joint moderately expanded, smaller in 4!" pair than in 34. Peraeopod 5, 24 joint large, descending much below 34, 4th and 5th joints laminar, setose; all peraeopods with 6 and 7th joints small. Uropod 3, rami foliaceous, inner margin setose. Telson large, tapering, deeply cleft. 2 species. Synopsis of species: en N RAR ARE BER 1. A. hamatipes . p. 277 A FT I RE 2. A.stebbingi . p.277 1. A. hamatipes (Norm.) 1869 Syrrhoe h., A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.279 | 1893 Argissa h., T. Scott in: Rep. Fish. Board Scotl., v.11 p. 213 t.5 f. 50, 31 | 1871 A. typica, A. Boeck in: Forh. Selsk. Christian., 1870 p. 125 | 1872 & 76 4A.t., A. Boeck, Skand. Arkt. Amphip., v.1 t.7 f.2; v.2 p.206 | 1891 A.t., G. O. Sars, Crust. Norway, v.1 p.141 t.48 | 1893 A. t., A. Della Valle in: F. Fl. Neapel, v.20 p- 687 t.59 f£.91 | 1890 Chimaeropsis danica, Meinert in: Udb. Hauchs, v.3 p. 167 t.2 f. 4247. | Head longer than peraeon segments 1 and 2. Side-plate 1 distally widened and rounded, 24 and 34 triangular, 4" large, especially in Oo, 5th and 6! with hind lobe, much deeper than front. Pleon segments 4 and 5 dorsally smooth in oO (Fig. 70), in JS dorsally produced, in segment 5 the expansion large, overarching segment 6. Eyes, each containing 4 small bigeminous lentieular bodies imbedded at the periphery of a common pigmentary mass (Sars). Antenna 1, 1° joint of peduncle as long as 24 and 32 combined, flagellum with 7 joints, in Q as long as peduncle, in @ much longer, in J the first 2 joints of flagellum fused and fringed with cilia. Antenna 2, ultimate joint of pedunele as long as antepenultimate, much shorter than penultimate, flagellum with 7 joints, in O subequal to last 2 joints of pedunele, in 9 to the whole peduncle. Gmathopods setose. Peraeopods 1—5, finger held at an angle to preceding joint. Peraeopods 3—5 with 29 joint glandular. Uropod 3, outer ramus with minute 24 joint. Telson in Q subtriangular, in d more regularly oval. Colour whitish, pellueid, orange-tinted on antennae ‚and legs. L. 9 5, 0 6 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland; Norway, depth 38—188 m; Shetland; Firths of Forth and Clyde; S.W. of Belle Tle en Mer, depth 100 m); Kattegat. 2. A. stebbingi Bonnier 1896 A. s., J. Bonnier in: Ann. Univ. Lyon, v.26 P-626 1.36 f.4. | Pleon segment 5 in JS prolonged over 6!" in a salient apically rounded lamella. Head, lateral corners a little produced, obtuse; a vertical erest separates bases of antennae 1 and 2 of one side from antennae I and 2 of the other, the crest being divided by 2 emarginations into a bluntish rostrum, a truncate prominence, and a subacute projecting epistome reaching halfway along antepenultimate joint of peduncle of antenna 2. Pleon segment 3, postero- lateral corners quadrate. Eyes wanting. Antenna 1 in J, 34 joint fully half as long as 24, flagellum with 5 joints, together rather longer than pedunele. 1st densely clothed, longer than 24 and 34 joints of pedunele combined, accessory flagellum 278 Argissa, Astyra less than half its length, 2-jointed. Antenna 2 in C twice as long, penultimate Joint of peduncle more than thrice as long as antepenultimate, nearly. twice aslong as ultimate, flagellum with 8 slender joints. Antenna 1 inoQ, 34 joint less than half 24, accessory flagellum as long as 1° joint of primary. Ahtenna 2 in O, penultimate joint of peduncle much shorter than in 9. Mandibular palp pro- portionally longer than in A. hamatipes (p. 277), 39 joint twice as long as 24, Maxilla 1, inner plate small, with 2 setae, outer with 7 spines, 24 joint of palp much dilated towards the apex. Maxillipeds, finger ending in a long and strong spine. Gnathopods 1 and 2, 6% joint very narrowly oval, hind margin carrying serrate spines and some long setae, finger ending in a little spine. Peraeo- pods 1—5 nearly as in A. hamatipes, but without glandular bodies in 24 joint. Uropods 1—3 and telson also similar, but outer ramus of uropod 3 without spiniform 24 joint. L. C nearly 5 mm, 9 a little smaller. Bay of Biscay. Depth 940 m. 4. Gen. Astyra Boeck 1871 Astyra (Sp. un.: A. abyssi), A. Boeck in: Forh. Selsk. Christian., 1870 p.133 | 1876 A., A. Boeck, Skand. Arkt. Amphip., v.2 p.442 | 1892 A., G. ©. Sars, Crust. Norway, e.1 p.213 | 1893 A., A. Della Valle in: F. Fl. Neapel, «20 p. 69. Body tumid in front, integument thin. Head little produced in front. Side-plate 1 wider than 24 or 34, 4 obliquely truncate below emargination. Antennae 1 and 2 rather strong, not elongate, 1° with small accessory tlagellum, 24 rather the longer. Mouth-parts projecting below. Upper lip rounded, slightly emarginate. Lower lip (Fig. 71), inner lobes minute, contiguous, between widely separated outer lobes. Mandible, cutting edge rather wide, transversely dentate, accessor y plate on the left mandible, spines of spine- row numerous, molar weak, conical, 24 joint of palp much longer than 34, Maxilla 1, inner plate with several setae, 24 joint of palp long. Maxilla. 2, both plates short, broad, densely setose. Maxillipeds, inner plates moderate, outer large, reaching much beyond 24 joint of palp, inner margin spinose, palp rather short, stout, finger small. Gnathopods 1 and 2 not robust, sub- equal, scarcely subchelate, 5th joint much wider than 6*%. Peraeopods 1 and 2 rather slender. Peraeopods 3—5 rather robust, 24 joint oblong, not widely expanded. Uropods 1—3, rami narrowly lanceolate, spinulose, peduncle very short and rami long in uropod 3. Telson small, deeply eleft. 1 species. 1. A. abyssi Boeck 1871 A. a., A. Boeck in: Forh. Selsk. Christian., 1870 p.133 | 1876 A.a., A. Boeck, Skand. Arkt. Amphip., 0.2 p.443 t.9 f.4 | 1892 A.a,, G. OÖ. Sars, Crust. Norway, v.1 p.214 t.73 | 1893 A. «a., A. Della Valle in: F. Fl. Neapel, 0.20 p.694 1.60 £.2. Back quite smooth. Head, rostrum short, blunt, lateral Re almost obso- lete, post-antennal linguiform, deflexed. Side-plate 1 distally expanded, 294 4th distally narrowed, 5t" rounded quadrate, slightly bilobed. Pleon R>N segment 3, postero-lateral eorners nearly quadrate, segment 4 PD with deep dorsal depression. Eyes wanting. Antenna 1. 1° joint Fig. 71. A.abyssi. rather flattened, as long as 24 and 3X combined, flagellum Lower Hp. more than twice as long as peduncle, with 20—30 joints, [After G. ©. Sars.] flagellum delieate, 1-jointed. Antenna 2, peduncle rather stout, ultimate and pen- ultimate Jjoints subequal, carrying fascieles of setules, flagellum once and a half proximal 5—8 inflated, armed with sensory hairs, accessory = - Astyra, Syrrhoites 279 as long as. pedunele. Gnathopod 1 rather stronger than gnathopod 2, 5th joint rather longer and much wider than 6", ending in a short rounded setose lobe, 6 joint narrow oblong, with no distinet palm, finger short, spinose on inner margin. Peraeopods 3—5, 24 joint having outside an elevated diagonal ridge, finger lanceolate, spinulose at the edges. Uropod 1, rami nearly equal; uropod 2, rami rather unequal; uropod 3 with the shortest . 'peduncle, the longest rami, inner a little longer than the outer and longi- tudinally ridged. Telson rather longer than broad, eleft beyond middle, lobes distally diverging. Colour pale yellowish. L. © 8 mm. Arctic Ocean, North-Atlantie and North-Sea (North- and West-Norway). Depth 188-564 m. -5. Gen. Syrrhoites 0. Sars 1893 Syrrhoites (Sp. un.: S. serrata), G. O. Sars, Crust. Norway, v.1 p.391. : Body rather stout, compressed, carinate. Head, rostrum acute, deflexed, cheeks deep, inflated. Side-plates 1—-3 narrowly quadrangular. Eyes wanting. Antennae 1 and 2 subequal in O, in J antenna 2 the longer. Upper lip short, broad, distally truncate. Lower lip, inner lobes rather small, outer incised near apex on inner margin. Mandible stout, compact, cutting edge ‘conical, not dentate, or only bidentate, spine-row wanting, molar a very broad, triturating surface, palp extremely slender, 34 joint not longer than 1°. Maxilla 1, inner plate with several setae, outer with 11 spines, palp long. Maxilla 2, inner plate the broader, fringed on inner margin. Maxillipeds, inner plates broad, outer broad, armed with unusually strong spines, 34 joint of palp linear, finger very small. Gnathopods 1 and 2 feeble, 5! joint twice as long as 6%, which is small, imperfeetly subchelate, palm very oblique, with no strong defining spine. Peraeopods 1 and 2 very slender and feeble. Peraeopods 3—5 much stronger, successively longer, 24 joint expanded oval. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami lanceolate, subequal. Telson long, distally narrowed, deeply eleft. 3 species accepted, 1 doubtf£ul. Synopsis of accepted species: Pleon segment 3, margin above postero-lateral tooth 1 N TE N A 1. 8. serratus . . p.279 | Pleon segment 3, margin above postero-lateral tooth simple — 2. j Pleon segments 1—3 with dorsal teeth inconspieuous 2. 8. fimbriatus . p.280 R \ Pleon segments 1-—-3 with dorsal teeth conspieuous 3. 8. walkeri . . p.281 1. S. serratus (O. Sars) - 1879 Bruzelia serrata, G.O.Sars in: Arch. Natury. ‘ Kristian., «4 p.447 |1885 B.s., G. O. Sars in: Norske Nordhavs-Exp., ©.6 Crust.I p-182 t.15 £.3 | 1893 B.s., A. Della Valle in: F. Fl. Neapel, v.20 p.668 t.59 f.77,78| 1893 Syrrhoites s., G. O. Sars, Crust. Norway, v.1 p.392 t. 137. Carinate throughout, peraeon segments 4—7 with carina raised to simple triangular processes, pleon segments 1—3 to a small and a large point, hinder on segment 3 upturned, on segments 4—6 likewise produced, on segment 4 with 2 points in ©, with only 1 in C, on segment 5 upturned in ©. much stronger and deflexed in C. Head, rostrum strongly deflexed, reaching apex of 1° joint of antenna 1, lateral corners rounded. Side-plate 3 scarcely .expanded below, 4" rather less deep than 34, slightly emarginate, 280 Syrrhoites triangular below. Pleon segments 1—3 very large, laterai corners of 1° rounded, of 24 a little produced, of 34 very acutely produced below a deep sinus, above which the margin is serrate with 5 upturned teeth. Eyes not even represented by pigment. Antenna 1 in Q, 1° joint a little longer than 24, 24 than 34, flagellum less than peduncle, 9-jointed, accessory flagellum small, 2-jointed. Antenna 2in 9 scarcely longer,ultimate joint ofpeduncle slightly shorter than penultimate, flagellum about half as long as peduncle. Antenna 1 in CS, 1 joint as long as 24 and 34 combined, 1° joint of flagellum very long, with long sensory filaments, accessory flagellum much longer than in ©. Antenna 2 in d much longer, flagellum longer than peduncle. Maxillipeds, outer plates fringed with 8 unusually strong spines. Gnathopods 1 and 2 very small, 5th joint narrow, not tapering, palm of 6% subequal to and making very obtuse angle with hind margin, finger short, 2-jointed. Peraeopods 3—5, 24 joint serrate on hind margin, 6!" joint very slender and long, especially on peraeopod 5. Uropod 3, rami intermediate in length between outer and inner ramus of uropods 1 and 2, outer ramus with short 24 joint. Telson oblong triangular, eleft more than ”/, of length, apices narrow, bidentate, contiguous. Colour yellowish grey. L. 8 mm. Arctic Ocean, North-Atlantie and North-Sea (West-Norway). Depth 282-658 m. 2. S. fimbriatus (Stebb. & D. Roberts.) 1891 Syrrho& f., T. Stebbing & D. Robertson in: Tr. zool. Soc. London, ».131 p.34 t.5z | 1895 S. f., A. Della Valle in: F. Fl. Neapel, v.20 p.662 | 1895 S. f., A. O. Walker in: P. Liverp. biol. Soe., v.9 p. 304. Body faintly carinate, integument not indurated, peraeon segment 7 and pleon segments 1 and 2 apparently produced dorsally to a small tooth; in the S only, pleon segment 5 has a tooth projecting over segment 6, and segment 6 is dorsally fringed with close-set spinules. Head curved in front to a strongly deflexed carinate rostrum. Side-plate 3 rather widened below, lower front corner rather acutely produced, 4th less deep, rounded below. Pleon segment 3, postero-lateral corners acutely upturned. Antenna 1 in O, 1° joint longer than 24, 24 Jittle longer than 34, flagellum not longer than peduncle, with 6 joints, 1° not very long, accessory flagellum with 2 joints, 24 minute. Antenna 2 in O subequal, ultimate and penultimate joints of peduncle subequal, flagellum much shorter than peduncle, 5-jointed. Antenna 1 in Q', 1st joint longer than 24 and 34 combined, flagellum rather longer than peduncle, with 7 joints, 1° setose, as long as the other 6 combined, accessory flagellum with 3 joints, 1° long, 3% minute. Antenna 2 in d much longer, ulti- mate joint of peduncle long, a little longer than penultimate, flagellum longer than pedunele, about 12-jointed. Lower lip slightly ineised on inner margin of outer lobes, mandibular processes wide-spread. Mandible, ceutting edge seemingly not dentate in O, bidentate in 9, 34 joint of palp about as long as 1*t, tipped with 5 long setae. Maxilla 1, inner plate with 8 setae, outer with 11 spines, spine-like setae on tip of palp’s 24 joint. Maxillipeds, inner plates broad, outer fringed with 8 spines of moderate size. Gmathopod 1, 24 joint distally widening, 5% not very slender, not twice as long as 6!", spinose on hind margin, 6tb broadest where the short hind margin forms very obtuse angle with tbe very oblique palm, finger short, abruptly narrowed at the centre. Gnathopod 2 more slender, 5!" joint twice as long as 6th, 6 ind with margins parallel all along, forming a minute palm much overlapped by the small curved finger; in © palm oblique, corresponding with an oblique row of spines on the hand of the Q'. Peraeopods 1 and 2 slight. Peraeo- > 3 ” MIN ; | ET Syrrhoites, Syrrhoe 281 pods 3 and 4, 24 joint narrowly oblong oval, hind margin serrate. Peraeo- pod 5, 24 joint broadly oval, hind margin serrate. Uropod 1, peduncle shorter than inner ramus, more than twice as long as outer, which ends in a long spine. Uropod 2, peduncle a little longer than outer ramus, about half as long as the broadly lanceolate spinulose inner. Uropod 3, peduncle rather shorter than the subequal rami, outer ramus 2-jointed, both in C armed on inner margin. Telson nearly twice as long as broad, cleft beyond centre, apices acute, minutely notched. L. 1'5 mm. Firth of Clyde; Irish Sea (Calf of Man). 3. S. walkeri Bonnier 1896 $. w., J. Bonnier in: Ann. Univ. Lyon, 2.26 p.647 t. 38 £. 4. Carinate (apparently) throughout, hind segments of peraeon projecting, pleon segments 1—6 each prolonged into dorsal tooth, large on 1°t—3d, on 34 upturned, in J tooth on 5! produced over 6*", 6th fringed with close-set spinules. Head carinate, rostrum strongly deflexed, acute, reaching apex of 1° joint of antenna 1, lateral corners forming straight-fronted lobe. Side- plates as in S. serratus (p. 279), unless 4! be a little deeper than 34. Pleon segment 3, postero-lateral corners strongly produced, acute, margin above not denticulate. Eyes wanting. Antenna 1 in 9, 1% joint ending in a small hook, 24 and 34 equal, flagellum subequal to peduncle, 9-jointed, accessory flagellum small, 2-jointed. Antenna 2 in Q equal to antenna 1, flagellum short, 7-jointed. Antenna 1 in Cd‘, 34 joint shorter than 24, flagellum with 9 joints, 1 as long as pedunele, longer than the other 8 combined, densely fringed with sensory filaments, accessory flagellum 3-jointed. Antenna 2 in C much longer, ultimate joint of peduncle rather longer than penultimate, flagellum longer than pedunele. Epistome salient. Upper lip long, rounded. Other mouth-parts nearly as in S. serratus, but maxilla 1, outer plate said to have 12 spines, and maxillipeds have 11 spine-teeth of moderate size on outer plates, which reach apex of palp’s rather short 24 joint. Triturating lobes of stomach with 2 enormous spines in addition to the ordinary armature. Gnathopods 1 and 2 as in S. serratus, but palm defined by a strong spine. Peraeopods 1—5 similar to those of S. serratus but more slender, and ‚6% joint in peraeopods 3—5 more elongate. Uropods 1—3 as in S. serratus. Telson elongate triangular, cleft to centre, apices notched. L. 7 mm. Bay of Biscay. Depth 950 m. S.levis (Boeck) 1871 Syrrhoel., A. Boeck in: Forh. Selsk. Christian., 1870 p-148 | 1876 S.1., A. Boeck, Skand. Arkt. Amphip., e.2 p.473 | 1893 S.!., A. Della Valle in: F. Fl. Neapel, v.20 p. 662. L. 5 mm. Bömmelfjord (Moster [West-Norway]). Depth 282 m. 6. Gen. Syrrhoe Goös 1866 Syrrhoö (part.), Go&s in: Öfv. Ak. Förh., 0.22 p.527 | 1871 $., A. Boeck in: Forh. Selsk. Christian., 1870 p.147 | 1888 S., T. Stebbing in:, Rep. Voy. Challenger, v.29 p.788 | 1893 $., G. O. Sars, Crust. Norway, v.1 p.389 | 1893 Syrrhoe (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 662. . Body rather slender, integument thin. Head produced to sharp strongly | . deflexed rostrum. Side-plates rather smäll, 3% much the largest, distally 282 Syrrhoe expanded, 4th very small. Eyes, when present, dorsal, eoalesced. Antennae 1 and 2 slender, antenna 2 the longer, in d much the longer. Upper lip distally narrowed, rounded. Lower lip, inner lobes well developed, mandibular processes widely spread. Mandible, eutting edge and accessory plate dentate, spine-ow and molar normal, palp slender, 39 joint minute, tipped with long setae. Maxilla 1, inner plate with many setae, outer with 11 spines, palp rather long. Maxilla 2, plates subequal, inner fringed on inner margin. Maxillipeds, inner plates rather broad, outer not very, fringed with spines, palp normal. Gnathopods 1 and 2 feeble, slender, subchelate, palm transverse, armed with thumb-like denticulate spine. Peraeopods 1—5 slender; peraeopods 3—5 successively longer, with 29 joint expanded, serrate on hind margin. Uro- pods 1 and 2, outer ramus much the shorter; uropod 3, outer ramus a little the shorter, 2-jointed. Telson long, deeply cleft. 3 species. / Synopsis of species: 1 j Pleon segment 3, postero-lateral margin not serrate 3. 8. papyracea . . P.283 \ Pleon segment 3, postero-lateral margin serrate — 2. Pleon segment 3, postero-lateral margin wholly 2 I RR RE ER ET RRE Sa r EEE . 1. 8. crenulata . . p.282 Pleon segment3, postero-lateral margin partly serrate 2. 8. semiserrata . p.283 1. S. erenulata Goes 1866 $.c., Goös in: Öfv. Ak. Förh., 0.22 p.527 t.40 f.25 | 1876 S.c., A. Boeck, Skand. Arkt. Amphip., ©.2 p.471 t.9 f.5; t.12 f.4 | 1893 8. c., G. ©. Sars, Crust. Norway, v.1 p.390 t.136 | 1893 S. c. (part.), A. Della Valle in: F. Fl. Neapel. v.20 p. 663 t.59 f. 74. Body nearly eylindrical, peraeon segment 7 and pleon segments 1—3 dorsally serrate. Head strongly vaulted in front, rostrum reaching beyond middle of 1°: joint of antenna 1. Side-plates 1 and 2 narrow, directed. for- ward, 39 nearly securiform, front margin sloping forward, hind lobe narrowly truncate beneath deep emargination which receives side-plate 4. Pleon segments, postero-lateral angles in 24 a little produced, acute, in 3 nearly quadrate, hind margin above sinuous, serrate with upturned teeth, nearly meeting the dorsal serration. Eyes forming a large dark red dorsal mass. Antenna 1 in 9, 1% joint with apical tooth, 29 a little shorter than 1°, 34 than 24, flagellum slender, rather longer than peduncle, 18-jointed, accessory flagellum with 3 joints, 39 minute. Antenna 2 in oa little longer, ultimate joint of peduncle rather longer than long penultimate, both setulose, flagellum half as long as peduncle. Antenna 1 in C, 1° joint fully as long as24 and 39 combined, flagellum very long, 1° joint very large, densely fringed, others rather long, accessory flagellum with laminar 1° joint. Antenna 2 ind, flagellum very long, filiform, joints short, numerous. Upper lip, partly carinate. Gnathopod 1, 5th joint about twice as long as 6%", which is oblong triangular, widening distally and dense with delicate setae, tip “of finger erossing the palmar spine. (Gnathopod 2 similar, but longer and more slender, 5th joint about once and a half as long as the narrow 6%. Peraeopods 3—5, 24 joint coarsely serrate on hind margin, largest and produced downward in peraeopod 5, which has 5! and 6 joints elongate. Uropod 3, the lanceolate rami setose on inner margin. Telson long, lanceolate, nearly thrice as long as broad, eleft ?/,—-?/, of length, apices acute (bidentate Goös), contiguous. Colour variable, variegated with yellow, white and pink, side- a ee let 1 Sa An mn Tr De 5 Lu ae Sarah... RE HE Ve ie 1 an. a Wann a (,) 334 En 7, Mena ln Bars u An a FRE S r Ar va hd l dr a re Fa Syrrhoe 283 r plates and other parts coral-red, antennae and limbs banded with orange. L. © 10 mm, © less. Arctie Ocean, North-Atlantic, North-Sea and ie Sg (Greenland, Spitzbergen, Norway). Depth 38—188 m. 2. S. semiserrata Stebb. 1888 S. s., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.793 t.51 | 1893 S.s., A. Della Valle in: F. Fl. Neapel, 0.20 p.663 t.59 f.72, 73. © unknown. — d.. Peraeon segment 7 and pleon segments 1 and 2 dorsally produced into a small tooth. Head strongly vaulted in front, rostrum carinate, reaching beyond middle of 1° joint of antenna 1. Side- ' plates 1—4 nearly as in S. crenulata. Pleon segments, postero-lateral angles in 2 a little produced, acute, in 39 not produced, hind margin above cut into 8 upturned teeth not nearly reaching the unserrated dorsum. Eyes as in S. erenulata, colour not known. Antenna 1, 1° joint thick, longer than 24 and 34 combined, 1° joint of flagellum nearly as long as pedunele, densely fringed, accessory flagellum about as long as 1° joint of primary, slender, serrate, setae along one side and spines along the other. Antenna 2, ultimate joint of pedunele much more than twice as long as penulti- mate, penultimate nearly twice as long as antepenultimate, flagellum with at least 20 joints, which are slender, not short. Mandible, 3 spines in spine-row. Maxillipeds, outer plates fringed with 11 spines. Gmathopod 1, 5% joint fusiform, nearly twice as long as 6%, which widens a little distally, spinulose along hind margin, palm short, setose, the palmar spine with blunt process near the base and 7 oblique dentieles on its concave margin, finger short, hooked, stout at base. Gmathopod 2, 34 joint longer than 4", 5th narrow, slightly bent, nearly twice as long as 6%, which scarcely widens distally, hind margin spinulose and finely pectinate, palmar spine without the blunt process. Peraeopods 1 and 2 very slieht. Peraeopods 3—5, 24 joint not very large, the serration not coarse. Uropod 1, peduncle longer than rami, outer ramus much shorter than inner; uropod 2, outer ramus narrow, longer ‘ than inner ramus of uropod l, inner ramus very long, broad, spinose on both margins; uropod 3, rami long, lanceolate, fringed with setae on inner margin, outer a little the shorter, with small 24 joint. Telson long, deeply «left, character of apices uncertain. L. 7:5 mm. Bass-Strait. Depth 60 m. 3. S.papyracea Stebb. 1888 S. p-., D. Stebbing in: Rep. Voy. Challenger, v.29 p- 789 t. 50 | 1893 S. p., G. O. Sars, Crust. Norway, v.1 p.390 | 1893 S. erenulata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 663. Peraeon segment 7 and pleon segments 1—4 dorsally serrate, the central tooth most prominent on pleon segment 2. Head produced and sharply eurved at base of sharp-edged rostrum. Side-plates 1—4 nearly as in S. crenulata, but 3% with a more quadrate hind lobe. Pleon segments 2 and 3, postero-lateral angles acutely produced, more strongly in 24 than 34, margin above not dentieulate. Eyes not perceived. Antenna 1 in oO, 1° joint with no large apical tooth, 24 joint rather shorter than 1°, 34 than 24, flagellum longer than peduncle, with 15 joints or more, 1° longest, accessory flagellum with 2 long joints and 1 very short. Antenna 2 much longer, ultimate joint of peduncle as long as the short antepenultimate and long pen- ultimate combined, flagellum shorter than peduncle, with 18 unequal joints. Mandible, spine-row of 6 spines. Maxillipeds, outer plates fringed with 16 spines, 34 joint of palp longer than in the other species, finger with a nail as long EN WE N MR 2 A NE re re une 284 Syrrhoe, Pseudotiron as the basal part. Gnathopod 1, 5tR joint fusiform, more than twice as long as 6%, hind margin densely fringed, 6t% short, widening distally, hind margin pectinate, palm slightly oblique, sinuous, setose, the palmar spine with 7 or 8 denticles, finger reaching a little beyond the palm. Gmathopod 2, 34 joint shorter than 4", 5tk Jong, narrow, spinose, more than twice as long as 6%, which is longer, and narrower than in gnathopod 1, scarcely widened distally, armature similar. Peraeopods 1—5 much as in S. crenulata (p. 282), but 24jointin peraeopods 3—5 less strongly serrate. Pleopods, peduncles with small interlocking process at apex, coupling spines large, 4 cleft spines on 1° joint of inner ramus. Telson not twice as long as broad, cleft a little beyond middle, apices acute, with small lateral tooth above. L. 12 mm. Tropical Atlantie (Virgin Island Culebra). Depth 713 mm. 7. Gen. Pseudotiron Chevreux 1895 Pseudotiron (Sp. un.: P. bowvieri), Chevreux in: Bull. Soc. zool. France, v. 20 p. 166. Body compressed, not indurated. Head triangular (as in Synopia, p. 271), more advanced in J than in ©. Side-plate 3 the largest, greatly excavate (as in Syrrhoe, p. 281). Eyes (as in Argissa, p. 276) small, imperfectly deve- loped. Antenna 1 in S much shorter than antenna 2; accessory flagellum 3-jointed. Mouth-parts and gnathopods nearly as in Tiron (p. 275). Man- dible normal, cutting edge and accessory plate dentate, spine-row of several spines, prominent molar, but palp very slender, 34 joint scarcely longer than broad. Maxilla 1, inner plate with several setae, outer with usual spines, 24 joint of palp broad at apex. Maxilla 2, inner plate the broader with inner margin partially fringed. Maxillipeds, inner plates normal, outer armed with 3 long and 5 stout spine-teeth, palp rather long, finger long. Gnatho- pods 1 and 2 long, slender, simple, setose. Peraeopods 1 and 2 short, stout, finger short, hooked. Peraeopods 3—5, 24 joint expanded, 6!h very short, finger small, hooked. Uropods 1 and 2, rami unequal; uropod 3, pedunele short, rami long, broad, subequal, spinulose. Telson long, lanceolate, eleft nearly to base. 1 l species. 1. P. bouvieri Chevreux 1895 P.b., Chevreux in: Bull. Soe. zool. France, v.20 p- 166 £.1—14. Peraeon smooth. Pleon segments 1—3, hind margin denticulate, segment 4 with 3 dentieles, segment 5 with 1 long tooth extending over segment 6. Side- plate 1 distally expanded, 34 with straight front margin, hind part reetangular below emargination, 4!" much smaller, obliquely produced and rounded below a slight emargination. Pleon segment 3, postero-lateral angle a little produced, acute. Eyes in Q, a group of 4 small lenses near front margin of head (compare Argissa, p. 276), not observed in d. Antenna 1 in ©, 1° joint rather longer than 34, 24 much shorter than either, flagellum a little longer than peduncle, 9- or 10-jointed, accessory flagellum small. Antenna 1 in C, 1% joint much longer than 24 and 34 combined, flagellum considerably longer than pedunele, 1% joint much the longest, fringed, longer than the 3-jointed accessory flagellum. Antenna 2 in C, ultimate joint of peduncle shorter than penultimate, flagellum much longer, 23-jointed. Gmnathopods 1 and 2, 34 and 4th joints very short, 5th joint long and slender, 6th linear, . a DA Te a A al ee Tr AN, Baal b Man. en NEST ee Ehe PERL EEE NEE 4 Pseudotiron, Calliopiidae - 285 in gnathopod 1 half as long as 5", in gnathopod 2 °/, as long as th, finger rather long, nearly straight. Uropod 2 the smallest. Uropods 1 and 2, the inner ramus the shorter (Chevreux, but?). Uropod 3, outer ramus armed with 3 rows of spinules, inner with a row of setules. Telson, apices subacute, in figure a little divergent. Colour pellueid. L. 9 5 mm. Mediterranean (North of Tunis). Depth 170 m. "22. Fam. Calliopiidae 1893 Calliopiidae, G. O. Sars, Crust. Norway, v.1 p.431. Body compressed or with broadly vaulted peraeon, with or without dorsal teeth. Head, rostrum unimportant. Side-plates small or of moderate size. Antenna 1, peduncle usually short, accessory flagellum 1-jointed or wanting. Upper lip rounded or faintly bilobed. Lower lip with inner lobes small or wanting. - Other mouth-parts varying little from the normal. In Laothoes (p. 286), however, the palp of maxilla 1 is abnormally small, and the outer plates of maxillipeds are abnormally large. In Sancho (p. 288), and perhaps also in Paraleptamphopus (p. 294), the gnathopods (Fig. 72, 73) show striking sexual differences. Gnathopods 1 and 2 usually feeble, sub- chelate. Marsupial plates large, broad. Uropod 3, inner ramus much, or more usually little, longer than outer. Telson entire, sometimes a little notched or emarginate. Marine, generally distributed; rarely in wells. 15 genera accepted, 1 imperfectly known, 29 accepted species, 8 obscure. Synopsis of accepted genera: j Lower lip without inner lobes — 2. \ Lower lip with inner lobes.— 8. jest Maxilla 1, palp very small; maxillipeds, outer plätes very large; ER 1. Gen. Laothoes. . ... . p. 286 Maxilla 1, palp not very small; mas peds, outer plates not very large — 8 | Back broadly vaulted — 4. \ Back not broadly vaulted — 6. Antenna 1 without accessory flagellum; | telson. nobched .. ..:,2... anna, 2. Gen. Chosroes. . ... . p: 287 | Antenna 1 with accessory flagellum; telson not notehed — 5. B o in Maxillipeds, outer plates smaller than EI EN u RE 8. Gen. Sancho. ..... . . .- p. 288 $; | Maxillipeds, outer plates larger than ER A .. .. 4. Gen. Amphithopsis . . . p.289 6 Body with some segments dorsally dentate 5. Gen. Halirages. . ... . p. 290 Body without dorsally dentate segments — 7. Antenna 1 without accessory flagellum; uropod 3, rami unequal. ..... 6. Gen, Leptamphopus . . . P.293 san 1 with accessory flagellum; uropod 3, rami equal... .... . 7. Gen. Paraleptamphopus . p. 294 { Telson at apex smoothly rounded —- 9. Telson at apex acute or notched — 10. 1 x 286 : Calliopiidae, Laothoes l Peraeopod 5 of moderate length, finger 9: DRIVER. N a a an 8. Gen. Calliopius . .. . . p: 295 | Peraeopod 5 very elongate, finger straight 9. Gen. Paracalliope . . . . p.297 0 | Telson notehed — 11. 1 \ Telson not notehed — 12. Side-plates 1—4 rather deep; mandible u | with eutting edge outdrawn.. . . . 10. Gen. Harpinioides . . . . p.298 | Side-plates 1---4 rather shallow ; mandible with cutting edge not outdrawn . . 11. Gen. Atylopsis. ..... p- 299 j Antenna 1 longer than antenna 2 — 18. ir \ Antenna 1 not longer than antenna2— 14. 13 Body with some segments dorsally dentate 12. Gen. Cleippides . . . . . p- 300 Body without dorsally dentate segments 13. Gen. Stenopleura . . . . p.302 | Side-platesshallow, 4thnotdeeperthanlst 14. Gen. Haliragoides . . . . p.308 14 ? Side-plates not very shallow, successively | deeper to the 4h ........ 15.. Gen. Apherusa .... .. p: 304 1. Gen. Laothoes Boeck 1871 Laothoös (Sp. un.: L. meinerti), A. Boeck in: Forh. Selsk. Christian., 1870 p- 202 | 1876 L., A. Boeck, Skand. Arkt. Amphip., v.2 p.360 | 1890 L., T. Stebbing in: Ann, nat. Hist., ser. 6 v.5 p.194 | 1893 Laothoe (non J.C. Fabrieius 1807, Lepi- doptera!), G. O. Sars. Crust. Norway, v.1 p.453 | 1893 Thoelaos, A. Della Valla in: F. Fl. Neapel. v.20 p. 592. Side-plates not very large. Antennae 1 and 2 slender, antenna 1 the shorter, peduncle short, no accessory flagellum. Mouth-parts much pro- jeeting. Upper lip rounded triangular. Lower lip without inner lobes. Mandible normal, strong, accessory plate on both, 34 joint of palp shorter than 24. Maxilla 1, inner plate with 5 setae, outer with strong spines, palp very small, 24 joint rudimentary, nodiform. Maxillipeds, inner plates normal, outer very large, broad, reaching almost to extremity of palp, with dentate inner margin. Gnathopods 1 and 2 feeble, 5!" and 6th joints narrow, rather long, palm very short. Peraeopods 3—5, 24 joint oval, largest in peraeopod 5. Uropod 2, outer ramus much the shorter; uropod 3, rami long, subequal, lanceolate. Telson entire. 1 species accepted, 1 uncertain, 1. L. meinerti Boeck 1871 L. m., A. Boeck in: Forh. Selsk. Christian., 1870 p-202 | 1876 L. m., A. Boeck, Skand. Arkt. Amphip., v.2 p.361 | 1893 L. m., Laothoe m., G.O. Sars, Crust. Norway, v.1 p.454 t. 160 | 1893 Thoelaos meinertü, A. Della Valle in: F. Fl. Neapel, v.20 p. 592. Body rather long and eylindrie. Head, rostrum very small, lateral corners deflexed, rounded, post-antennal quadrate.. Pleon segment 3, postero-lateral corners almost quadrate, the margins slightly convex. Eyes oblong oval, widened below, light red. Antenna 1 in O not half as long as the body, 1°* joint thick, Imuch longer than 24 and 3X combined, flagellum setiferous, of many short joints, about 4 times as long as peduncle. Antenna 2 considerably longer, ultimate and penultimate joints of pedunele subequal, flagellum fully thrice as long as peduncle. Gnathopod 1, 5" joint fusiform, as long as narrowly oblong 6*", palm nearly transverse, scarcely half as long as hind margin. Gnathopod 2 rather longer, 5t" joint widest distally, as long as the narrow, almost linear 6th, Peraeopods 1—5 moderately slender, 24 joint in peraeopods 3—5 with smooth DEE Tin Ku Lab er RAR SLR Laothoes, Chosroes 287 hind margin. Uropod 3, rami about twice as long as peduncle, fringed with spinules only. Telson oval quadrangular, with apex broad, faintly emarginate. Colour pellueid, yellowish, indistinetly banded with orange; ova in pouch pale violet. L. 0 8 mm. Aretie Ocean, North-Atlantic and North-Sea (Hardangerfjord, depth 565—942 m; Trondhjemsfjord; Nordland). L. carcinophilus (Chevreux) 1889 Paramphithoe careinophila, Chevreux in: Bull. Soe. zool. France, v.14 p.288 f. | 1893 P. e., Acanthozone?, A. Della Valle in: F. Fl. Neapel, v.20 p. 619. L. 7 mm. North-Atlantie (Azores, between Pico and San Jorge, depth 620 m, and off Flores, depth 1386 m). From the carapace of Geryon sp. 2. Gen. Chosroes Stebh. 1888 Chosroes (Sp. un.: C. ineisus), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1208. Back of peraeon broadly vaulted in front, with side-plates laterally out- spread, pleon segments 4—6 folded under, 5!" and 6!" not very short. Head, rostrum minute. Side-plate 1 small. Antenna 1 the shorter, without accessory flagellum; both 1° and 24 antennae calceoliferous. Upper lip rounded. Lower lip without inner lobes. Mandible normal, palp very large, 34 joint longer but narrower than 24. Maxilla 1, inner plate with 2 or 3 setae, outer with . 11 spines. Maxilla 2, inner plate only partially fringed on inner margin. Maxillipeds, outer plates scarcely reaching middle of palp’s 24 joint, inner margin fringed with submarginal spinules, palp rather elongate, finger short with a short sharp nail. Gnathopods 1 and 2 small, similar, 5t" joint rather elongate, palm rather short, slightly oblique. Peraeopods 1 and 2, 24 joint partially dilated; peraeopods 3—5, expanded 2 joint notched, 4" joint in all broad, not long. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami subequal, lanceolate. Telson slightly notched. 1 species. 1. C.incisus Stebb. 1888 C.i., T. Stebbing in: Rep. Voy. Challenger, v.29 p:1209 t.134, 135 | 1893 Acanthozone incisa, A. Della Valle in: F. Fl. Neapel, v.20 p.614 t. 59 f. 26. z Body dorsally very wide at middle of peraeon, pleon segment 6 considerably longer than 5th. Side-plate 4 deeply emarginate, 5" broad, the lobes about equal in depth. Eyes :broadly oval, wide apart, lenses numerous. Antenna 1, 1° joint stout, a little longer than 24, and 24 than 34, flagellum about twice as long as peduncle, with more than 34 joints, short, distally a little widened, these and last 2 joints of pedunele with many small calceoli. Antenna 2 decidedly longer, ultimate joint of peduncle longer than penultimate, flagellum longer than pedunele, with more than 24 joints, short, broad, ealeeoliferous. Triturating lobes at entrance of stomach with short curved and long straight spines. Gmathopod 1, 5tk joint somewhat expanded in the middle, 6!" equally long, broader, oval, palm slightly convex, shorter than hind margin, defined by a group of palmar spines. Gmnathopod 2 similar but more elongate. Peraeopods 1 and 2, 24 joint expanded into a broad lobe near but not at the apex, 5th joint longer than 4th, 6" than 5th, finger short. Peraeopods 3—5, 24 joint broad, hind margin deeply notched below the middle. Marsupial plates large. Uropods 1 and 2, outer ramus shorter RENT UE RER ER ER a8 a SZ, 288 Chosroes, Sancho than inner; uropod 3, rami equal, broadly lanceolate, inner with spines and setae on both margins, outer with spines and setae on inner, groups of spines on outer margin. Telson as long as peduncle of uropod 3, not twice as long as broad, a short triangular notch separating 2 rounded apices, sides convex in young, slightly concave in adult. L. 10 mm. Strait of Magellan (Cape Virgins). Depth 100—128 m. 3. Gen. Sancho Stebb. 1897 Sancho (Sp. un.: 5. platynotus), T. Stebbing in: Tr. Linn. Soc. London, ©: ser.2 0.7 p.42. Back of peraeon broadly vaulted, with side-plates laterally outspread, pleon narrow, segments 3—6 folded under. Head with angular front. Eyes dorsal, separate. Antenna 1 with short pedunele, accessory flagellum small, l-jointed. Antenna 2 not mueh longer than antenna 1. Upper lip broader than long. Lower lip without inner lobes. Mandible, cutting edge, accessory plate and spine-row small, molar and palp powerful. Maxilla 1, inner plate with 2 setae, outer with 11 spines, small and inconspieuously denticulate. Maxilla 2, inner plate broader than outer, not fringed on inner margin. Maxillipeds, inner plates broad, outer smaller than, and scarcely reaching beyond, the inner, palp well developed, finger small. Gnathopod 1 (Fig. 72) feeble, subchelate. Gnathopod 2 in © similar to gnathopod 1, in C (Fig. 73) very elongate, with 6% joint massive. Peraeopods 1 longest. Uropods 1—3, outer ramus shorter than inner. Telson small, entire. . 1 species. 1. S. platynotus Stebb. 1897 S. p., T. Stebbing in: Tr. Linn. Soc. London, ser.2 0.7 p.42 t.9A. Peraeon segment 1 very short, segment 7 longer; flexing of pleon begins at the 24 segment. Head dorsally flattened. Side-plate 1 distally a little widened, 4% the largest, emarginate behind, serrulate below the excavation. Fig. 72, Pleon segments 1 and 2, postero-lateral eorners minutely produced. Eyes round, wide apart on top of head, light pinkish in spirit. Antenna 1, 1° joint longer than 24 and 34 combined, flagellum in C 4 times as long as pedunele, with 41 joints, the 1° slightly longer than 34 joint of peduncle, and longer than accessory flagellum. Antenna 2, ultimate joint of peduncle longer and thinner than pen- 24 joint 5% joint ultimate, both spinose, flagellum nearly as in Fig, 78. antenna 1. but setuliferous. Upper lip, distal Fig. 7 em. 8. platynotus, 5. margin almost straight. Mandible, 3° joint of nathopods 1 and 2. ; . & ß palp as long as 24, wide, with spines on oblique apex. Maxillipeds. outer plates fringed with slender spines on the inner margin, 39 joimt of palp narrower but not much shorter than 24, finger. short, tipped with spinules. Gnathopod 1 in C (Fig. 72), 5% joint considerably longer and narrower than the 6%, which is rather longer than broad, palm short, nearly transverse, with small finger to match; in the Q 5!" and 6 joints narrow, not very long, subequal, 6% rather the longer. Gnatho- pod 2 in G (Fig. 73), 24 joint narrewer at base, a little widened near the middle, 5!" joint subfusiform, shorter and strikingly narrower than the massive 5 normal, 5tb the Sancho, Amphithopsis 289 rotundo-quadrate 6%, which has the front margin straight, the hinder curved, slightly crenulate, palm broad, almost transverse, divided into 3 or 4 irre- gular teeth, finger smooth, eurved, elosing down into a pocket excavate in thiekness of 6% joint; in the 9 5! and 6tk joints almost as in gnatho- pod 1, feeble, but rather more elongate. Peraeopods 1—5, 4 joint a little widened and produced, finger small, with spinule on inner margin. Peraeopods 1 and 2 rather short; peraeopod 3, 24 joint tending to oval; peraeopods 4 and 5, 24 joint more oblong, fringed on both margins with long setae, hind margin nearly straight, produced downward, especially in peraeopod 5, which has numerous spines and spinules on the narrow, elongate, subequal 5% and 6th joints. Uropod 2, peduncle as long as in uropod 1 and rami longer than in uropod 1. Uropod 3, pedunele short, apically dentate, outer ramus much shorter and narrower than inner. Telson scarcely as long as peduncle of uropod 3, as broad as long, margins strongly convex, rather abruptly converging to the obtuse apex. L. (without fiexed part of pleon) about 3 mm. Port Jackson [East-Australia]. 4. Gen. Amphithopsis Boeck 1861 Amphithopsis (part.), A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 661 | 1876 A., A. Boeck, Skand. Arkt. Amphip., «2 p.349 | 1893 A., G. O. Sars, Crust. Norway, v.1 p.455 | 1894 A., T. Stebbing in: Bijdr. Dierk., v.17 p. 36. Back of peraeon broadly vaulted, with side-plates laterally outspread, pleon segments 5 and 6 dorsally not very short. Head, rostrum small, post-antennal corners not produced. Antennae 1 and 2 long, slender, subequal, accessory flagellum very small. Upper lip distally narrowed, rounded. Lower lip without inner lobes. Mandible normal, 34 joint ot palp large. Maxilla 1, inner plate with several setae. Maxilla 2, inner plate only partially fringed on inner margin. Maxillipeds normal, rather robust. Gnathopods 1 and 2 small, subequal, 5t% joint rather elongate, palm short, transverse. Peraeopods 3—5, 24 joint oval, peraeopods 4 and 5 much longer than peraeopods 1—3. Uropods 1—3, outer ramus much shorter than inner. Telson small, entire. 1 species. 1. A. longiecaudata Boeck 1861 A.1.,, A. Boeck in: Forh. Skand. Naturf., Möde 8 p. 663 | 1876 A.1., A, Boeck, Skand. Arkt. Amphip., v.2 p.351 t.22 f.3 | 1893 A.1., G. O.Sars, Crust. Norway, v.1 p.456 t.161 | 1893 Acanthozone Il. (part.), A. Della "Valle in: F. Fl. Neapel, v.20 p. 605 t. 59 f. 17. Peraeon segment 7 longest. Head, rostrum rather prominent, lateral sorners narrowly rounded. Side-plates close set, 1° distally expanded. Pleon segment 3, postero-lateral angles quadrate, produced point scarcely percep- tible. Eyes irregularly round, light red. Antenna 1 rather longer than the body, 1° joint a little longer than 24, 24 about twice as long as 34, flagellum 5 times as long as pedunele, brittle, many-jointed, setulose, accessory flagellum linear, 1-jointed, about as long as 1° joint of primary. Antenna 2 subequal to ‚antenna 1, less slender, ultimate joint of peduncle longer than penultimate, both of. these together with proximal part of flagellum densely setose, flagellum more than twice as long as peduncle. Gnathopod 1, 5tk joint somewhat expanded in the middle, 6!" subequal in length, widening distally to transverse palm, which is about half as long as hind margin. Gnathopod 2 scarcely longer, more slender, Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 19 290 Amphithopsis, Halirages 6b joint narrower, with shorter palm. Peraeopods 1 and 2 rather slender. Peraeopods 3—5 rather robust, 29 joint with hind margin smooth, finger in all peraeopods large, with 2 dentieles near the curved apex. Uropod 2 reaching beyond uropod 1, and about as far as uropod 3, which has outer ramus scarcely '/; as long as inner. Telson oval triangular, apex obtusely pointed. Colour Dellueid, "whitish, mottled in bands with light red; ova in pouch bluish green. L. © 7 mm. Arctic Ocean, North-Atlantie and North-Sea (Norway). Depth 94—282 ın. 5. Gen. Halirages Boeck 1871 Halirages (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.194 | 1876 H., A. Boeck, Skand. Arkt. Amphip., 0.2 p.337 | 1893 H., @G. 0. Sars, Crust. Norway, v. N p- 435. ö Body slender, with some segments dentate. Head, post-antennal corners acute, not strongly produced. Side-plates 1—4 rather shallow. Antennae 1 and 2 elongate, with small ealceoli in several rows. No accessory flagellum. Upper lip rounded. Lower lip without inner lobes. Mandible normal, palp large, 3% joint curved. Maxilla 1, inner plate with ‚several (5 or 6) setae, outer with 11 spines. Maxilla 2, inner plate fringed on inner margin. Maxillipeds normal, palp robust. Gnathopods 1 and 2 feeble, 5th joint elongate, 6" oblong, palm shorter than hind margin. Peraeopods 1—5 rather slender, finger short. Peraeopods 3—5, 24 joint oval. Uropod 3 reaching beyond the others. Telson entire, with notch or seulpturing. 4 species accepted, 2 obscure. Synopsis of accepted species: Peraeon segment 7 and pleon segments 1 and 2 1 | dorsaly fridentste un seen a 1: BL nilssoni: >. >3.'729.290 | Peraeon segment 7 and pleon segments 1 and 2 dorsally unidentate — 2. Telson transversely truncate, a little emarginate 2. H. fulvocinctus . . p.291 Telson with a little apieal noteh... . . . . - 3. H.huxleyanus . . p.291 Telson' apieally tridentate 2. nu no 4. H. quadridentatus . p. 292, 2 1. H. nilssoni Ohlin 1895 AH.n., Ohlin in: Aeta Univ. Lund., v.81 nr.6 p.44 t. £.1—6. Peraeon segment 7 and pleon segments 1 and 2 each produced dorsally into a large central tooth, with a feebler one on either side of it. Pleon , segment 3 with an elevated keel, not dentate but strongly rounded behind. Side-plates 1—3 (in figure) very much smaller than the 4, Pleon segment 3, postero-lateral corners produced to an acute tooth, the lateral. margin above forming a truncate lobe with serrate margin, ending in a tooth above. Eyes large, oval or slightly reniform, dark with a lighter rim. Antenna 1, 1% joint rather longer than 24, 34 about '/, as long as 24, outdrawn in a laminar ealceoli- ferous process to middle of 15° joint of flagellum, which joint is as long as 6 or 7 of the following short joints. Antenna 2 as long as the body, twice as long as antenna 1, penultimate joint of peduncle as long as ultimate, outdrawn at apex.. Mouth-parts as in H. fulvoeinetus, but 34 joint of mandibular palp even more strongly developed. Gnathopods 1 and 2, 6th joint as long as bh, but considerably wider, widening towards the oblique palm. Gnathopod 2 rather weaker than gnathopod 1. Uropod 3, rami without setae. Telson. Halirages 291 not quite twice as long as broad, strongly tapering to an emarginate apex bounded by sharp points. L. 13 to about 18 mm. Baffın Bay. Depth 9-27 m. 2. H. fulvocinetus (Sars) 1858 Amphitho& fwlvocineta, M. Sars in: Forh. Selsk. Christian.. p. 141 | 1866 Paramphithoe f., Goes in: Ofv. Ak. Förh., v.22 p.525 t.39 £.15 | 1871 Halirages fulvocinctus, A. Boeck in: Forh. Selsk. Christian., 1870 p.196 | 1876 H. f., A. Boeck, Skand. Arkt. Amphip., ».2 p.342 t.23 f.11f. | 1888 H. f., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.90 | 1893 H. f., G.O.Sars, Crust. Norway, v.1 .p.436 t.154 | 1895 Acanthozone fulvocincta (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.614 t.59 f.27 | 1864 Pherusa tricuspis, Stimpson in: P. Ac. Philad., 1865 p.139. Peraeon segment 7 and pleon segments 1 and 2 each produced to a dorsal tooth. Side-plates 1—3 quadrate with rounded corners, 4" broader, more rounded, emarginate behind. Pleon segment 3, postero-lateral corners and lateral margin as in H.nilssoni. Eyes large, oval, bright red. Antenna 1 in © more than */, length of body, flagellum more than 4 times as long as pedunele, otherwise as in H. nilssoni; antenna 2 longer, ultimate and penultimate joints of peduncle subequal, with many calceoli, flagellum nearly 4 times as long as peduncle, with calceoli in double row. Antennael and 2 inc stil more elongate. Mandible, 3% joint of palp longer than 24, eurved, elosely fringed. Maxillipeds, outer plates with smooth inner margin, fringed with submarginal spine-teeth, 34 joint of palp apically a little produced. Gnathopod 1, 5t" joint slightly widening distally, 6!" subequal, rather .narrowly oblong, palm much shorter than hind margin, not very oblique, but defined by an obtuse angle, armed with short spines, finger short. (mathopod 2 similar, rather longer. Peraeopods 1—5 moderately long, fringed with fascieles of spinules. Peraeopod 5, 24 joint broadly oval, much larger than that of peraeopods 3 and 4, hind margin smooth, roundly produced below. Uropod 3, peduncle rather long, rami nearly twice as long as peduncle, densely fringed with spinules and on the inner margin also with setae. Telson about twice as long as broad, slightly tapering, apex very slightly emarginate and serrulate. Colour pellucid, yellowish, transversely banded with orange. L. © reaching 19 mm. Arectie Ocean (widely distributed, reaching lat. 820 27°N.); North-Atlantie (South of Halifax [Nova Scotia], whole West-Norway). Depth 2--470 (659?) m. R 3. H. huxleyanus (Bate) 1862 Atylus h., Bate, Cat. Amphip. Brit. Mus., p.155 t.25 f.4 | 1888 Halirages h., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.902 t.73 : 1893 Acanthozone huxleyana, A. DellaValle in: F. Fl. Neapel, ».20 p.612 t.59 f.23. Back rounded to end of peraeon segment 6, imbricated, peraeon segments 5—7 with postero-lateral angles produced acutely backward. Peraeon segment 7 and pleon segments 1—3 each produced into a large tooth, and at least pleon segments 1—3 carinate, peraeon segment 6. slightly toothed. Head, rostrum acute but very small. Side-plates 1—4 small, of rather irregular shape, 4% not much larger than 34, 5" strongly bilobed. Pleon segments 1—3, postero-lateral eorners produced into short acute points. Eyes round, not very large, dark in spirit, with a light rim. Antenna 1, 1° joint not as long as 24 and 3% combined, 3% more than half 24, flagellum 3 or 4 times as long as peduncele, with 62 joints, at intervals much widened distally. Antenna 2, peduncle rather longer than in antenna l, 19* 292 Halirages flagellum about equal; ultimate joint of pedunele rather shorter than pen- ultimate, flagellum evenly tapering, with 56 joints, some of the proximal having as many as 6 calceoli, and the last 3 joints of peduncle having 2 or 3 rows of them. Mandible, 3% joint of palp very spinose, scarcely as long as 24, Maxillipeds, outer plates with smooth inner margin, fringed with submarginal spine-like setae. Gnathopod 1, 5!" joint shorter and narrower than 6th, 6th oval, narrowest at hinge of finger, palm very oblique and ill-defined. Gnathopod 2 similar, but rather longer, not wider. ' Peraeo- pods 1—5 not especially slender, finger short, curved. Peraeopod 5, 24 joint somewhat piriform, much larger than in peraeopods 3 and 4. Uropods 1 and 2 with few marginal spinules, each with a stout apical spine, outer ramus shorter than inner; uropod 3, rami subequal, about twice as long as peduncle, lanceolate, with several spinules and setae. Telson longer than peduncle of uropod 3, more than twice as long as its greatest breadth, sides a little sinuous, not strongly tapering, apex triangularly notched. L. 22:5 mm. South-Atlantie (Stanley Harbour [Falkland Islands], lat. 52° S, from kelp; Hermit Island, lat. 56° S.); Strait of Magellan. 4. H. quadridentatus O. Sars 1876 H. quadridentatus, G.O. Sars in: Arch. Naturv. Kristian., ©.2 p.257 | 1885 H.gq., G.0O.Sars in: Norske Nordhavs-Exp., ®.6 Crust. I p. 172 t.14 f.4ı, 4a—f | 1893 Acanthozone quadridentata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.611 t.59 f.22 | 1882 Halirages elegans, A. M. Norman in: P.R. Soc. Edinb., v.11 p. 688. Peraeon segments 6 and 7 and pleon segments 1 and 2 each produced into a dorsal adpressed tooth. Head, rostrum obsolete, lateral corners narrowly rounded, post-antennal produced to an acute deflexed lobe. Side-plates 1—4 described as simple rounded, and finely serrate along the lower margin (but Sars fig. 4d shows side-plate 1 with an acute front angle, in accordance with Norman). Pleon segment 1, postero-lateral angles rounded, in segments 2 and 3 quadrate, in segment 3 lateral margin above the angle slightly arcuate, very finely crenulated. Eyes very large, irregular oval, almost meeting above, brilliant red. Antenna 1 as long as body, 34 joint of pedunele very short, fiagellum 5 times as long as peduncle, joints numerous, short, except 1°. Antenna 2 considerably longer, ultimate and penultimate joints of peduncle subequal. Mandible, 34 joint of palp rather shorter than 24. Gmathopods 1 and 2, 5! joint slender, considerably longer than 6th, 6tk oblong, little widened distally, palm short, scarcely oblique. Peraeopods 1—5 very slender, 1° and 24 almost filiform, 3I—5tk with 24 joint piriform, produced at lower hind corner to a sharp point. Uropods 1 and 2, outer ramus much shorter than inner; uropod 3, outer ramus little shorter than inner, both long, lanceolate, with pectinate edges. Telson reaching beyond peduncle of uropod 3, twice as long as broad, triangular, apex tridentate, central tooth the largest, but all 3 small. Colour whitish, translueent, with a few faint red bands. L. 25 mm. North-Atlantie (West-Norway, depths 659 and. 960 m; lat. 60° N., long. 6° W., depth 988 m). H. batei (R. O. Cunningh.) 1871 Atylus? b., R. O. Cunningham in: Tr. Linn. Soe. London, v.27 p.498 1.59 f.9 | 1888 Halirages huxleyanus?, T. Stebbing in: Be: Voy. Challenger, v.29 p. 902. L. 16 mm, Strait of Magellan (Possession Bay). In. - RE Halirages, Leptamphopus 293 H. megalops (Buchh.) 1874 Paramphithoö m., Buchholz in: Zweite D. Nord- polarf., 0.2 p.369 Crust. t. 12 | 1893 Acanthozone fulvocineta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 614. Strongly separated from the genus Halirages by the non-dentated segments. the long rostrum, short 34 joint of mandibular palp and small size; but in other respeets close to H. fulvocinetus (p. 291). Also like, but not reconeilable with Apherusa megalops (p. 306). L. 5—7 mm. Arctic Ocean (Sabine Island, Germania Harbour, Shannon). Depth 19 m. 6. Gen. Leptamphopus 0. Sars 1880 Panoploea (part.), G. M. Thomson in: Ann. nat. Hist.. ser.5 e.6 p.2 | 1893 Leptamphopus (Sp. un.: L. longimanus). G. O. Sars, Crust. Norway. ®.1 p.458. Body not acutely dentate. Head, rostrum not very pronounced. Side-plates of moderate size, 4!" the largest, distinetly emarginate. Antennae 1 and 2 elongate, antenna 1 the longer, no accessory flagellum. Upper lip rounded. Lower lip without inner lobes. Mandible, eutting edge much produced, molar large, palp moderate. Maxilla 1, inner plate fringed with many setae, outer with spines very closely set, palp rather elongate. Maxilla 2, inner plate fringed on inner margin, both plates with the apex densely fringed. Maxillipeds not very large, outer plates not reaching end of palp’s 24 joint. fringed with spine-teeth on inner margin, palp comparatively small. Gnatho- pods 1 and 2 slender, unequal, the 24 much the longer, 6" joint nearly linear, palm very short and nearly transverse. Peraeopods 3—5, 24 joint oval. Uropod 3, rami narrow, unequal. Telson entire. 2 species. ‚Synopsis of species: None of the segments dorsally produced... . . . l. L. longimanus : . . . p.29% Peraeon segment 7 and pleon segments I and 2 Romsally Prag a er ae. 2. L. novaezealandiae . . p. 294 1. L. longimanus (Boeck) 1871 Amphithopsis longimana, A. Boeck in: Forh. Selsk. Christian.,. 1870 p.200 | 1876 A.1., A. Boeck, Skand. Arkt. Amphip., v.2 p.353 t.22 f.2 | 1893 Leptamphopus longimanus, G. O. Sars, Crust. Norway, v.1 p.459 t. 162 1893 Acanthozone longimana (part.), A. DellaValle in: F. Fl. Neapel, v.20 p.604 t.59 f. 16. Body slender, back evenly rounded. Head, rostral projeetion very small, lateral corners defined below by a small notch, post-antennal corners forming a triangular lobe. Pleon segments 2 and 3, postero-lateral corners sub- quadrate. Eyes faintly traceable in spirit. Antenna 1 in © nearly as long e body, 1° joint subequal to 24 and 34 combined, flagellum slender, about 5 times as long as peduncle. Antenna 2 much shorter, ultimate joint of ednicle longer than penultimate, flagellum not quite twice as long as peduncle. Mandible, said to have no accessory plate on right mandible. Gnathopod 1, 5th joint somewhat widened distally, forming a short setose lobe, 6!" as long as 5t%, but much narrower. sublinear, fringed behind with faseicles of setules, finger exceedingly small. Gmathopod 2 much longer, 34 joint not twice as long as broad, 5!" and 6tk joints subequal, very long and narrow, fringed behind with ‘setules, finger very small. Peraeopods 1—5 slender and brittle. Peraeopods 3—5, 24 joint oblong oval, hind margin perfectly smooth, that of a 5 much the largest. Uropod 1 much larger than uropod 2; uropod 3 reaching about te apex of uropod 2, outer ramus 294 Leptamphopus, Paraleptamphopus about half as long as inner. Telson oval quadrangular, with small notch in broadly truncate apex. L. © 10 mm. Arctic Ocean, North- Atlantie and North-Sea (Greenland; Norway, depth 282—752 m). 2. L. novaezealandiae (G. M. Thoms.) 1879 Pherusa n.-z., G. M. Thomson in: Tr. N. Zealand Inst., «11 p.289 t.10c f.2, 22—c | 1886 P. neo-zelanica, (G. M. Thomson &) Chilton in: Tr. N. Zealand Inst., ».18 p.148 | 1880 Panoploea debilis, 6. M. Thomson in: Ann. nat. Hist., ser.5 v.6 p.3 t.1 f.3 | 1898 Acanthozone longimana (part.), A. Della Valle in: F. Fl. Neapel, «.20 p. 604, 620. Back rounded, peraeon segment 7 and pleon segments 1 and 2 produced each dorsally into a flat obtuse tooth. Head with triangular front, no proper rostrum. Pleon segments 2 and 3, postero-lateral angles produced to a small tooth, smaller on 3% than 24, margin above smooth. Antenna 2 nearly as long as antenna 1. Right mandible perhaps with small accessory plate. Gnathopod 2, 34 joint at least 3 times as long as broad., Peraeopods 3-5, 24 joint with hind margin slightly serrate. First 3 marsupial plates very long and broad, 4 narrow. Apparently in uropods 1 and 2 the outer ramus is much the shorter, but in uropod 3 not very much shorter than the inner. Telson slightly tapering to a broadly rounded unnotched extremity. In other respects, the species shows elose agreement with L. longimanus. Colour light brown, made up of stellate markings. L. 9 mm. Dunedin Harbour [New Zealand]. 7. Gen. Paraleptamphopus Stebh. 1899 Paraleptamphopus, T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 209. Body not dentate. Antenna 1 the longer, with small accessory flagellum. Upper lip flatly rounded. Lower lip without inner lobes. Mandible normal, 39 joint of palp shorter than 24. Maxilla 1, inner plate with many setae, outer with 10 or 11 spines, 24 joint of palp with longer spines on one maxilla than on the other. Maxilla 2, inner plate fringed on inner margin. Maxilli- peds, outer plates not reaching apex of palp’s 24 joint, fringed with spine- teeth on inner margin. Gmathopods 1 and 2 subchelate, weak, 54 joint in gnathopod 2 rather long. Peraeopods 1—5, 6!" joint longer than 5%, finger short. Peraeopods 3—5, 24 joint oval. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami equal. Telson entire. 2 species. Synopsis of species: Eyes wanting, colour of body white, semipellueid . .. . 1. P. subterraneus . p.294 Eyes small, colour of body dark indieo blue . . . . . 2. P. caeruleus. . . p.295 1. P. subterraneus (Chilton) 1882 Calliope subterranea, Chilton in: N. Zealand J. Sei.. e.1 p.44 | 1882 C. s., Chilton in: Tr. N. Zealand Inst., «.14 p.177 t.9 f.1—10 | 1889 C. s., Moniez in: Rev. biol. Nord France, ».1 p.253 ! 1890 C. s., Wrzesniowski in: Z. wiss. Zool., 2.50 p.611 | 1886 Calliopius subterraneus, (G. M. Thomson &) Chilton in: Tr. N. Zealand Inst., 0.18 p.148 | 1894 €. s.2, Chilton in: Tr. Linn. Soc. London, ser.2 0.6 p9.234 1.28 f.10—18; #3 t.22 f.1—15, t.23 f. 1—9) | 1898 Acanthonotosoma subterraneum (part.), A. Della Valle in: F. Fl. Neapel, ©.20 p. 678 | 1899 Calliope sub- terranea, Paraleptamphopus (part.), T. Stebbing in: Ann. nat. Hist., ser.7 ©.4 p.210. Paraleptamphopus, Calliopius 295 ©. Body slender. Head, rostral projection very small. Side-plates not very deep. Pleon segment 3, postero-lateral corners rounded. Eyes wanting. Antennal, 1°* joint rather longer than 24, 34 short, flagellum many-jointed, accessory flagellum 1-jointed. Antenna 2, ultimate joint of peduncle slightly shorter than penultimate, flagellum much shorter than that of antenna 1. Maxilla 1, inner plate with 10 setae. Maxilla 2, inner plate strongly fringed on the inner margin. Maxillipeds, outer plates nearly reaching end of palp’s 24 joint, 32 joint of palp a little produced over the short finger. Gnathopod 1, 5th joint distally widened, rather shorter than 6, which is oblong oval, palm sliehtly oblique "and serrulate, fairly well defined, finger with setules on the concave margin. Gnathopod 2 much longer and thinner, 5t% joint considerably longer than 6", both nearly parallel-sided, palm transverse, very short, well defined, finger very short. Uropod 1, peduncle longer than rami, outer ramus not much shorter than inner; uropod 2, outer ramus eonsiderably shorter than inner; uropod 3, rami not very much longer than pedunele. Telson short, not tapering, broader than long, sides convex, apical border faintly coneave. Colour white, semipellueid. L. 5 mm. — The supposed © is uncertain in respeet to sex and to identity with the species. It has the flagellum calceoliferous in both 1° and 29 antennae, and on some of the limbs a plate additional to the normal branchia. New Zealand (Eyreton, Lincoln, Ashburton and Winchester). In wells. 2. P. caeruleus (G. M. Thoms.) 1885 Pherusa caerulea, G. M.'Ihomson in: N. Zealand J. Sei., v.2 p.576 | 1887 P. e., T. Stebbing in: Tr. zool. Soe. London, v.12vı p.206 1.39 f.» | 1886 Amphithopsis c., T. Stebbing in: P. zool. Soe. London, p.5 | 1899 Pherusa c., Paraleptamphopus (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210 | 1893 Acanthonotosoma subterraneum?, A. Della Valle in: F. Fl. Neapel, v.20 p. 678. Body rather compact, shining. Head, rostrum short, lateral corners narrowly obtuse. Side-plates 1—4 rather deep, 1% —34 oblong, 4? much the largest, rounded below, emarginate behind. Pleon segment 3, postero-lateral corners rounded. Eyes very small, dark. Antenna 1, 1° joint much thicker than 24 and rather longer, 22 much longer than 34, flagellum about thrice as long as pedunele, 33-jointed, accessory fagellum 1-jointed. Antenna 2 much shorter, ultimate joint of peduncle rather shorter than penultimate, flagellum 19-jointed. Maxilla 1, inner plate with 15 setae, outer with 10 spines. Maxilla 2, fully fringed on inner margin of inner plate. Maxillipeds, outer plates nearly reaching end of palp’s 24 joint. Gnathopods 1 and 2 feeble and slender, 5th joint distally a little widened, longer than 6%, which is also a little widened distally. palm oblique, short, in gnathopod 2 defined by a promi- nence, against which the setulose end of the blunt finger impinges. Uropod 1, peduncle longer than rami, outer ramus not much shorter than inner. Uropod 3, rami not very long, but longer than peduncle. Telson rounded, shorter than the short peduncle of uropod 3. Colour deep indigo-blue, appearing black when alive, persistent in spirit, but flagellum of antennae 1 and 2, and appendages of peraeon and pleon light. L. 5 mm. New Zealand (Otago). In streamlet, at height of about 915 m above sea-level. 8. Gen. Calliopius Lillj. 1856 Calliope (Sp. un.: ©. leachii) (non J. Gould 1836, Aves!), Bate in: Rep. Brit. Ass., Meet.25 p.58 | 1857 C., Bate in: Ann. nat. Hist., ser.2 «.19 p.142 | 1859 Paramphithoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.68 | 1861 Amphithopsis (part.), A. Boeck in: Forh. Skand. Naturf,, Mode 8 p.661 | 1865 296 i Calliopius Calliopius, W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 ©.6 nr.1 p.18,19 | 1876 @., A. Boeck, Skand. Arkt. Amphip., v.2 p.344 | 1893 C©., G. O. Sars, Crust. Norway, 1 p. 446 | 1866 Paramphithoe, Goes in: Ofv. Ak. Förh., v.22 p. 523. . Body rather strongly built, without dorsal teeth. Side-plates of moderate size. Antennae 1 and 2 not very slender, subequal, 39 joint of pedunele of antenna 1 apically produced, no accessory flagellum, joints in flagella sharply defined, calceoli in both sexes. Mouth-parts nearly as in Apherusa (p.304), but palp of mandible larger, with 3% joint as long as 24. Gmathopods 1 and 2, 5" joint short, cup-shaped, 6 large, oval, palm longer than hind margin, weakly defined. Peraeopods 1—5 rather strongly built, finger curved, not elongate, 3I—5t" pairs with 24 joint oval. Uropod 3 scarcely reaching beyond the others, peduncle short, rami lanceolate, subequal. Telson entire, linguiform. 2 species accepted, 1 obscure. Synopsis of accepted species: Antenna 1, 3d joint produced into a large lobe. . . . 1, ©. laeviusculus . p.24# Antenna 1, 34 joint produced into a small lobe. . . . 2. C.rathkii . . . . p.2%6 1. C. laeviusculus (Kröyer) 1838 Amphithoe laeviuscula, Kröyer in: Danske Selsk. Afh., ©.7 p.281 t.3 f.13a—h | 1859 Paramphithoel., R.M. Bruzelius in: Svenska Ak. Handl., n. ser. ©.3 nr.1 p.76 | 1861 Amphithopsis l., A. Boeck in: Forh. Skand. Naturf., Mede8 p.662 | 1862 Calliopel., Bate, Cat. Amphip. Brit. Mus.. p.148 t.28 f.2| 1871 Calliopius laewiuseulus, A. Boeck in: Forh. Selsk. Christian., 1870 p. 197 | 1876 ©. 1. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.345 | 1893 Acanthozone laeviuscula (part.), A. Della Valle in: F. Fl. Neapel. ©.20 p. 602 t.59 f.12 | 1856 Calliope leachii, Bate in: Rep. Brit. Ass., Meet.25 p.58 t.17 f.3 | 1857 C©.I., Bate in: Ann. nat. Hist., ser.2 r.19 p. 142 | 1858 Amphithoe serraticornis, M. Sars in: Forh. Selsk. Christian... p. 140. Pleon segments 1—3 dorsally raised at end, giving an imbrieated. appearance. Head, rostrum obsolete, lateral corners obtusely rounded. Pleon segment 3, postero-lateral corners subquadrate. Eyes oval, reniform, . very dark, larger in © than in 9. Antenna 1 of '/, length of body, 1°% joint. as long as 24 and 34 combined, 34 produced beyond 1° joint of flagellum, with row of 8 calceoli on the triangular lobe, flagellum rather longer than pedunele, with 20—30 joints sharply defined, as though the flagellum were serrate. Antenna 2 scarcely longer, flagellum similar in appearance, sub- equal to peduncle. Gnathopods 1 and 2 strongly built, 5" joint with setose lobe, 6 wide at base, narrowing from commencement of oblique palm to hinge of finger. Peraeopods 1-—-5 strong, 24 joint of 5'" pair rather.large, especially in the S. Uropod 3, both rami plumose and spinose. Telson nearly twice as long as broad, a little dilated at base, smoothly rounded at apex. Colour uniformly light green, with whitish area on front of back. L. 9 12, 13—14 mm. Aretic Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland; Spitzbergen; Labrador; Norway, depth 6—56 m; British Isles); North-Pacifie. 2. C. rathkii (Zadd.) 1844 Amphithoe r., Zaddach, Syn. Crust. Pruss.. p.# | 1895 Calliopius rathkei, G. ©. Sars, Crust. Norway, v.1 p.447 1.157 f.2 | ?1847 Amphi- thoe gibba, (H. Frey &) R. Leuckart, Wirbell. Th., p.162 | 1862 Calliope grandoculis, Bate, Cat. Amphip. Brit. Mus., p. 149 t.28 f.4 | 1879 Calliopius laeviusculus (err., non’ Amphithoe laeviuscula Kröyer 1838!), Hoek in: Tijdschr. Nederl. dierk. Ver., #.4 p.138 t.6 f.4, 6, 7, 10—12: t. 10 £.7. Calliopius, Paracalliope 297 Glosely approaching C. laeviuseulus. Segments rather sharply defined. Head, rostrum short but distinet, lateral eorners subtruneate. Pleon segment 3, postero-lateral eorners produced to a small but distinet upturned point, margin above convex. Eyes obliquely oval, dark brown, larger in 9 than no. Antennal, 18 joint not as long as 24 and 34 combined, 34 about '/, aslong as 24, produced lobe quite short, with only 2 or 3 ealceoli. Gmathopods 1 and 2, lobe of 5th joint narrow, sparingly setose, 6'% less stout than in preceding species. Peraeopods 1—5 not so stoutly built as in C. laeviuseulus. Uropod 3, both rami spinose, only the inner plumose. Telson fully twice as long as broad, of uniform width, smoothly rounded at apex. Colour yellowish violet, with irregular orange specks, segments banded behind with reddish brown, on dorsum of peraeon segments 3 and 4 a shield of silvery lustre. L. oO searcely over 6 m. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, Bohuslän, France, Holland, Great Britain); Kattegat. C. pietus (Giles) 1890 Parapleustes p., G. M. Giles in: J. Asiat. Soc. Bengal, v.59 p.70 1.2 £.6 | 1893 Acanthozone laeviuscula?, A. Della Valle in: F. Fl. Neapel, v.20 pP. 895. Very like C. laeviusculus. Pleon segment 3, postero-lateral angles rounded. Eyes very large. Colour resembling that of the host. L. reaching 7 mm. Bay of Bengal (Andaman Isles). Depth 55 m. On Pennatula sp. 9. Gen. Paracalliope Stebb. 5 1899 Paracalliope (Sp. typ.: Calliope fluviatilis), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210. Body without dorsal teeth. Side-plates not very large. Antenna 1 the shorter, without accessory flagellum or calceoli. Upper lip rounded. Lower lip with inner lobes. Mandible slightly constructed, normal, 39 joint of palp at least as long as 24. Maxilla 1, inner plate with many (11) setae, outer with (apparently) 11 spines, 24 joint of palp carrying spine- teeth and slender spines. Maxilla 2, inner plate the narrower, fringed along inner margin. Maxillipeds, inner plates rather broad, outer reaching apex of palp’s 24 joint, fringed with spines on inner margin, the series not eontinued on the apical border, finger of palp acute. Gnathopod 1,'5*" joint rather shorter than oval 6%. Gnathopod 2, 5" joint cup-shaped, 6? quadrangular oval, with hollow well-defined palm. Peraeopods 1—4, finger eurved. Peraeo- pod 5 much longer than the others, finger long, straight, spinose. Uropods 1—3, rami slender, with few spines. Uropod 3, rami equal, not longer than peduncle. - Telson short, entire. PT 1 species. 1. P. fluviatilis (G. M. Thoms.) 1879 Calliope f., &. M. Thomson in: Tr. N. “ Zealand Inst.. «.1l p.240 t.10c f.4, 4a—c | 1886 Calliopius f., (G. M. Thomson &) Chilton in: Tr. N. Zealand Inst., v.18 p.148 1899 Calliope f., ?Oedicerus novae-zealandiae, Paracalliope sp. typ., T. Stebbing in: Ann. nat. Hist.. ser.7 v.4 p.210 | 1880 Pherusa australis. Haswell in: P. Linn. Soe. N.S.Wales, v.5 p.103 t.7 £.1. Peraeon segments 1—6 rather short. Head, front obtuse-angled. Side- plate 1 a little widened distally. Pleon segment 3, postero-lateral corners 'subquadrate. Eyes oblong oval, large, black. Antenna 1, 1% joint as long as 24 and 34 combined, but much stouter, 39 nearly '/, as long as 24, and 298 Paracalliope, Harpinioides (contrary to Haswell and Thomson) quite distingwishable from the flagellum, whieh is slender, about twice as long as pedunele, 21-jointed. Antenna 2 longer, ultimate and penultimate joints of pedunele subequal, flagellum about twice as long as peduncle, 24-jointed. Upper lip transversely oblong, with distal margin not strongly eonvex. Mandible, cutting edge and accessory plate slight in structure, spine-row with few spines, molar very prominent, 39 joint of palp curved, spinose, narrow at apex. Gnathopod 1, 5th joint elongate triangular but not very long, 6! with oblique palm. Gnathopod 2 considerably stronger, lobe of 5!" joint fringed with slender spines, 6!" broad at base, widening a little to the moderately oblique palm, which on one margin is evenly concave, on the other sinuous and spinose, the rather strong finger closing down in the hollow between them; the reversion of gnathopod 2, beginning at 5" joint, recalls the eurious torsion in gnathopod 1 of Trischizostoma nicaeense (p. 13). Peraeo- pods 15, 6!" joint longer than either 4 or 5%, the 4ı—6th joints spinose, 24 joint in peraeopods 3—5 expanded, hind margin little serrate. Peraeopod 5, 6 joint elongate, but shorter than the long, stiliform, spinose finger. Uropod 1, rami shorter than peduncle, outer ramus little shorter than inner. Uropod 2, outer ramus much shorter than inner. Uropod 3, peduncle rather elongate. Telson little longer than broad, of uniform width to the smoothly rounded apex. Colour greyish, more or less marked with dark spots. L. 5 mm. This species is not improbably identical with Oedicerus novi-zealandiae Dana (p.270), which Boeck, in 1861, includes into his genus Aceros (p. 248). New Zealand. In fresh water, in brackish or nearly salt water. — Botany Bay |East-Australia]. 10. Gen. Harpinioides Stebb. 1888 Harpinioides (Sp. un.: H.drepanocheir), T. Stebbing in: Rep. Voy.Challenger, r.29 p.986 | 1890 Harpinoides, Warburton in: Zool. Ree., 0.25 Crust. p. 19. Back rounded. Head, rostrum obsolete. Side-plates 1—4 rather deep, 1° somewhat expanded distally. Antenna 1 the longer, pedunele short, accessory flagellum minute. Upper lip, distal margin broad, flat. Lower lip with inner lobes. Mandible, cutting edge very oblique, long, eut into numerous dentieles, accessory plate on left similar but shorter, on right represented by a short prickly spine, 10 spines in spine-row, molar small and slender, not dentieulate, 24 joint of palp dilated, 34 equally long, but narrower. Maxilla 1, inner plate with 1 seta, outer. with 9 spines, mostly smooth, 24 joint of palp somewhat dilated. Maxilla 2, inner plate shorter and narrower than outer, partially fringed on inner margin. Maxillipeds, inner and outer plates narrow, outer prolonged much beyond inner, but not reaching end of palp’s 24 joint, fringed on inner margin with slender spine-teeth, palp rather long. finger as long as 3% joint. Gnathopods 1 and 2 similar, 5th joint short, 6% long, tapering. Peraeopods 3—5, 24 joint greatly expanded. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami subequal, lanceolate. Telson almost entire, feebly notched. l species. I. H. drepanocheir Stebb. 1888 H. d.. T. Stebbing in: Rep. Voy. Challenger, v.29 p.987 t.82 | 1893 Acanthonotosoma d., A. Della Valle in: F. Fl. Neapel, v. 20 p. 677 1.59 8.87. Harpinioides, Atylopsis 299 Pleon segment 3, postero-lateral corners strongly rounded. Eyes not observed. Antenna 1, 1° joint stout, longer than 24 and 34 combined, flagellum twice as long as pedunele, with 24 joints, 1° the longest; accessory fiagellum shorter than 1° joint of primary, eonsisting of 1 narrow, truncate joint. Antenna 2, ultimate joint of pedunele rather shorter than pen- ultimate, flagellum shorter than pedunele, 14-jointed. Gnathopods 1 and 2, 5’ joint cup-like, about '/, length of 6!, 6th broadest at base, tapering with a curve to a narrow apex, without definite palm, finger long, slender, slightly eurved, about half length of 6!" joint and closing over the coneave part of its margin. Gmnathopod 2 rather the longer. Peraeo- pods 1—5, 5t" joint shorter than 4% or 6b, finger curved. Peraeopod 3, 2° joint almost as broad as long, and of nearly equal breadth throughout. Peraeopod 5 longer than peraeopod 4, and with 24 joint broader. Telson longer than peduncle of uropod 3, once and a half as long as broad, slightly tapering to a slight triangular emargination between minutely notched apiees. L. 6 mm. Cumberland Bay |Kerguelen Island]. Depth 232 m. 11. Gen. Atylopsis Stebb. 1888 Atylopsis (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 924. Side-plates rather shallow. Antenna 1, peduncle short. Upper lip slightly bilobed. Lower lip with inner lobes. Mandible normal, palp strong, 34 joint as long as 24. Maxilla 1, inner plate with few setae, outer with 11 'spines. Maxilla 2, inner plate with few setae on inner margin. Maxillipeds, outer plates without spine-teeth on inner margin, 39 joint of palp produced over base of finger. Gnathopods 1 and 2 not very powerful, subchelate, 24 larger than 1%. Uropods 1—3, outer ramus shorter than inner. Telson short, with emarginate apex. 2 species. Synopsis of species: Pleon segments 1 and 2 dentate; uropod 3, rami extremely EB re RER eg ...... 1. A.dentata . . . p.299 Pleon segments 1 and, 2 not dentate; uropod 3, rami not extremely unequal . ........ N NEE 2. A. emarginata . p.300 1. A. dentata Stebb. 1888 A. dentatus, T. Stebbing in: Rep. Voy. Challenger, r.29 p. 929 t.80 | 1893 Acanthonotoseoma?, Acanthozone?, A. Della Valle in: F. Fl. Neapel, 0.20 p.910. - Like, but quite distinet from Apherusa tridentata (p. 305). Peraeon seg- ment 7 and pleon segments 1 and 2 each produced to a dorsal tooth, surface of body rather hairy. Head, rostrum small, obtuse, lateral margin forming a rounded lobe, post-antennal cormers not produced. Side-plate 1, lower front corner rounded, slightly outdrawn. Pleon segment 3, postero-lateral corners produced into a small tooth. Eyes broadly oval. Antenna 1, 1° joint not twice as long as 24, 24 scarcely longer than broad, remainder missing. Antenna 2, penultimate joint of peduncle not elongate, after-part missing. Maxilla 1, inner plate with 2 setae; on outer plate only 10 spines were actually ob- served. Maxilla 2, inner plate rather shorter and narrower than outer, with RER TE SR 300 Atylopsis, Cleippides 2 setae on the inner margin. Maxillipeds, outer plates small, feebly armed, finger of palp short, with spine-like nail. Gmathopod 1, 5 and 6 joints equal, 6!" very little widened distally, palm short, oblique, much shorter than hind margin, with defining spine at the eurve in which they meet. Gnathopod 2 longer, 5! joint rather shorter than 6%, which is a little more widened towards the more oblique palm than in gnathopod 1. Peraeopod 1, 6% joint longer than 4% or 5th, finger rather strong. with 2 or 3 setules on convex margin. Peraeopods 3—5, 24 joint broadiy oval, serrate on hind margin, largest in peraeopod 5. Uropods 1—3, outer ramus much shorter than inner; uropod 3, peduncle very short, outer ramus narrower than inner and about half its length, both acute and carrying spines, Telson as long as peduncle of uropod 3, a little longer than broad, ending in a small triangular emargination between obtuse apices, sides convex. L. 6 mm. Strait of Magellan (Cape Virgins). Depth 100 m. 2. A. emarginata Stebb. 1888 4A. emarginatus, T. Stebbing in: Rep. Voy. Challenger, ©.29 p.932 t.81 | 1893 Acanthonotosoma emarginatum, A. Della Valle in: F. Fl. Neapel, v.20 p. 678 t.59 f. 86. Body not dentate. Head, rostrum small, obtuse, post-antennal corners slightly produced, rounded. Side-plate 1, lower front corner slightly outdrawn. Pleon segment 3, postero-lateral corners rounded. Eyes seemingly large, reniform. Antenna 1, 1° joint little longer than 24, 24 than 34, flagellum not long, but nearly twice as long as peduncle, 30-jointed, accessory flagellum minute, 1-jointed. Antenna 2 longer, ultimate joint of pedunele rather longer than penultimate, flagellum with 33 joints, 1° longest. Maxilla 1, inner plate with 4 or 5 setae, outer with 11 spines. Maxilla 2, inner plate as broad as outer, with 4 setae on inner margin. Maxillipeds, outer plates moderately large, with long spines on distal margin and slender submarginal spines near the inner border, finger rather large, acute. Gnathopods 1 and 2, 5th joint much shorter than 6%, distally rather wide and cup-like, 6 joint oblong oval, palm oblique, with a tooth near the hinge, then sinuous and closely peetinate, in gnathopod 1 as long as the hind margin, but shorter than it in gnathopod 2; finger with inner margin cut into many adpressed teeth. Peraeopod 1, 6% joint longer than 4" or 5t", finger eurved, strong, unarmed. Peraeopods 3—5, 24 joint rather wider above than below, not strongly expanded, hind margin straight. Uropod 1, rami long; uropod 2, outer ramus much shorter than inner; uropod 3, peduncle short, rami long. outer ramus in © not greatly shorter than inner, but more decidedly so in © Telson longer than pedunele of uropod 3, a little longer than broad, distal emargination not as deep as wide, the triangular apices a little serrate on outer margin. L. 7 mm. Southern Indian Ocean (Marion Island). Depth 567 m. 12. Gen. Cleippides Boeck 1871 Cleippides (Sp. un.: CO. trieuspis), A. Boeck in: Forh. Selsk. Christian., 1870 p- 201 | 1876 C., A. Boeck, Skand. Arkt. Amphip., v.2 p. 357 | 1875 Cleippides, Cam. Heller in: Denk. Ak. Wien, ».35 p. 32. Back rounded in front, some of the hinder segments produced to a dorsal tooth. Side-plates 1—4 not large. Antenna 1 the longer, without \ Gleippides 301 accessory flagellem. Upper lip little or not at all emarginate. Lower lip with inner lobes obsolescent. Mandible, cutting edge not dentate, accessory plate dentieulate, spine-row small, or accessory plate and spine-row wanting (Heller), molar with a eircular ridge, 2% and 34 joints of palp distally widened. Maxilla 1, inner ‚plate with several setae, outer with 11. spines, st joint of palp about half as long as 24. Maxilla 2, inner plate rather the shorter, fringed on inner margin. Maxillipeds, inner plates of moderate size, outer not nearly reaching end of palp’s 24 joint (if Kroyer’s figure can be trusted against his text), fringed with spine-teeth on inner margin, palp stout, 1°°—34 joints subequal in length, 4" small. Gnathopod 1 weakly subchelate, 5tk joint much longer than 6", Peraeopods 1—5 slender, 32 — 5th with 24 joint little eg Uropod 3, rami lanceolate, equal. Telson small, entire. 2 species. Synopsis of species: Three segments, each produced into a dorsal tooth . . 1. C. trieuspis . . . p.301 Four segments, each produced into a dorsal tooth. . . 2. C. quadricuspis . p.301 1. C. trieuspis (Kroyer) 1846 Acanthonotus t., Kreyer in: Naturh. Tidsskr., ser.2 v.2 p.115 | 1846 A.t., Kroyer in: Voy. Nord, Crust. t.18 f.1a—v | 1862 Dexaminet., Bate, Cat. Amphip. Brit. Mus, p.133 t,24 f.5 | 1866 Paramphitho£ t., Goes in: Ör. Ak. Förh., v.22 p.525 | 1871 Cleippides t., A. Boeck in: Forh. Selsk. Christian., 1870 2.201 | 1876 C.t., A. Boeck, Skand. Arkt. Amphip., v.2 .p.358 | 1893 Acanthozone t. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 608 t.59 £.13, 14. Without carina. Peraeon segment 7 and pleon segments 1 and 9 sach produced into a large flat dorsal tooth. Head, rostral projeetion small. Side-plates 1—3 deeper than broad, lower corners rounded. Side- plate 4 rather broader, slightly emarginate behind. Pleon segment 3, postero -lateral angles outdrawn into a tooth, above which is another, separated by a rather large sinus. Eyes narrowly reniform, dark, the colour disappearing in spirit. Antenna 1 long, thin, 1° joint as long as 22 and 34 combined, flagellum thrice as long as pedunele, 50—60-jointed. Antenna 2 much shorter, ultimate joint of peduncle rather shorter than penultimate, flagellum rather longer than peduncle, 40-jointed. Gnatho- pod 1,:5th joint much longer than the narrowly oval 6t%, palm undefined, finger small, but strong, curved, bidentate. Gmathopod 2 rather longer, 5 joint narrow, scarcely longer than the narrowly quadrangular 6th, Peraeopods 3—5, 24 joint larger in peraeopod 4 than in 34, in 5th than in 4, narrowing downward, the hind margin serrate, tending to concave. Uropod 1, outer ramus little shorter than inner; uropod 2, outer ramus much shorter than inner. Telson oval, feebly acuminate. Colour chestnut-brown. L. reaching 16 mm or more. Arctie Ocean and North-Atlantie (South-Greenland, Spitzbergen). 2. C. quadricuspis Heller 1875 C. q., Cam. Heller in: Denk. Ak. Wien, +85 p.82 t.3 f.1—16 | 1885 ©. q., G.O. Sars in: Norske Nordhavs-Exp., v.6 CrustI ».174 t.14 f.5 | 1893 Acanthozone trieuspis (part.), A. Della Valle in: F. Fl. Neapel, ».20 p. 608. Peraeon segment 7 and nleon segments 1—3 bluntly carinate and each produced into a long dorsal tooth. Head, rostrum small, acute, lateral 302 Cleippides, Stenopleura corners angular, scarcely produced, post-antennal cormers acutely produced downward. Side-plates 1—4 subquadrate, produced -below into a minute- pointed tooth, in front of 1%, behind in 2I—4%; 5th and 6 each produced into 2 teeth, 5'% pair much wider than the rest. Pleon segment 3, postero- lateral corners with 2 teeth as in C. tricuspis. Eyes small, reniform, almost colourless. Antenna 1, 1% joint as long as 24 and 39 combined, flagellum more than thrice as long as pedunele, many-jointed. Antenna 2 scarcely half as long. Gnathopods 1 and 2 alike, but the 24 rather longer than the 1°; 5t" joint long, distally wide, 6% abruptly narrower, oval, about half as long, palm undefined, finger curved. Peraeopods 3—5, 2° joint scarcely expanded, except a little at the base; peraeopod 5 with a tooth, the lower hind angle produced to a point. Uropods 1—3 and telson as in ©. trieuspis. Colour yellowish white shading into violet and rose-red; mouth-parts and most of the limbs of a rich carmine. I. 42—52 mm. Arctic Ocean (lat. 67°—80° N,, long. 16° E.—12° W., depth 663 1890 m; Spitz- bergen, depth 160265 m). 13. Gen. Stenopleura Stebh. 1888 Stenopleura (Sp. un.: S. atlantica), 'T. Stebbing in: Rep. Voy. Challenger, v.29 p. 949. Body slender, not dentate. Head, post-antennal corners not produced. Side-plates 1—4 very shallow. Antenna 1 the longer, without accessory flagellum. Lower lip with inner lobes. Mandible with accessory plate on left, spine-row with very few spines, molar strong, palp robust, 34 joimt as long as 24. Maxilla 1, inner plate with 1 seta, outer with 10 spines, 24 joint of palp tipped with spine-teeth. Maxilla 2, inner plate shorter than outer, each with a few apical spines, inner margin unarmed. Maxillipeds, inner plates with distal margin sloping outward, outer plates not reaching beyond apex of palp’s 1° joint, with 3 spines on apical margin and a few submarginal setae on inner, finger as long as 39 joint of palp. Gmnathopods | and 2 alike, subequal, 5'% joint short, cup-like, 6" oval, rather large, finger long. Peraeopods 1 and 2, 24 and 4th joints widened. Peraeopods 3—5, 24 joint expanded, finger in all peraeopods smoöth, curved. Uropods 1 and 2, outer ramus much shorter than inner; uropod 3, rami long, lanceo- late, outer nearly as long as inner. Telson entire, apically sculptured. l species. 1. S. atlantica Stebb. 1888 8. a., T. Stebbing in: Rep. Voy. Challenger, ». 29 p-950 t.84 | 1893 Acanthozone a., A. Della Valle in: F. Fl. Neapel, ©.20 p.601 1.59 f. 11. Head, rostrum and lateral corners little prominent. Side-plate 1 distally a little produced forward. . Pleon segment 3, postero-lateral corners subquadrate. Eyes large, oblong oval. Antenna 1, peduncle short, 1° joint stout, longer than 24 and 3@ combined, flagellum about 5 times as long as peduncele, soon becoming filiform, with 33 joints, 15 nearly as long as 24 of peduncle. Antenna 2 rather shorter, ultimate joint of peduncle shorter than penultimate, flagellum more than 4 times as long as pedunele, filiform, 35-jointed. Gmatho- pods 1 and 2, 5th joint triangular, with serrate spines on the slightly produced lobe, 6th joint triangular oval, tapering to the hinge of the eurved finger; to judge by the length of the latter, the palm may be considered to form the hind margin. Gnathopod 2 is slightly the larger, with the lobe of the ‘ Stenopleura, Haliragoides 303 5th joint rather narrower and more decidedly produced. Peraeopods 1 and 2, 24 joint not twice as long as broad, narrowest at the base, 4" shorter than either 5th or 6%, broad, with convex outer margin. Peraeopods 3—5, 22 joint widely oblong oval, but in peraeopod 5 with straightened hind margin and produced below the 34 joint. Uropods 1—3, all the rami spinulose, in uropod 2 outer ramus only half as long as inner, in uropod 3 peduncle very short, outer ramus a little shorter and more slender than inner. Telson rather longer than peduncle of uropod 3, a little longer than broad, the central piece of the tridentate apex much larger than the lateral teeth. L. 75 mm. Tropical Atlantie (lat. 2—3° N., long. 8—-24° W., depths 91 and 3383 m); South- Atlantic (near Tristan da Cunha). 14. Gen. Haliragoides 0. Sars 1893 Haliragoides (Sp. un.: H. inermis), G. O. Sars, Crust. Norway. v.1 p.432. Body slender, not dentate. Head, post-antennal corners strongly produced. Side-plates 1—4 shallow, 4" not deeper,than 1%°—3@. Antenna 1 the shorter, without accessory flagellum. Upper lip with rounded, very slightly insinuate margin. Lower lip, inner lobes distinet, small. Mandible normal, well developed, 3% joint of palp much shorter than 2%. Maxilla 1, inner plate with several setae. Maxilla 2, inner plate fringed on inner margin. Maxillipeds normal, outer plates fringed with spine-teeth, palp rather robust than elongate. Gnathopods 1 and 2 subequal, rather feeble, 5tb joint elongate, 6% oval, palm very oblique. Peraeopods 1—5 very slender, long, finger long and thin. Peraeopod 5, 24 joint much larger than in peraeopods 3 and 4. Uropod 3 reaching much beyond the others. Telson entire, apically sculptured. 1 species. 1. H.inermis (O.Sars) 1882 Halirages i., G. ©. Sars in: Forh. Selsk. Christian., nr.18 p.103 t.5 £.5 | 1893 Haliragoides i., G.O.Sars, Crust. Norway, v.1 p.433 t.153 | 1893 Acanthozone quadridentata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 611. Back rounded, not at all carinate. Head, rostrum and lateral corners very little produced, post-antennal lobes linguiform, deflexed, serrate in front. Side-plate 1 obtusely. produced, 4! a little emarginate. Pleon segment 3, postero-lateral corners produced to a small acute tooth, above which the margin is convex, smooth. Eyes large, oval, feebly developed, light red. Antenna 1, 1° joint rather stout, apically dentate, nearly as long as 24 and 34 combined, flagellum about thrice as long as peduncle, with 28 joints, 15 elongate. Antenna 2 much longer, longer than the body, ultimate and. penultimate joints of peduncle subequal, flagellum 5 or 6 times as long as peduncle, 1° joint long, slender, the others short. Gnathopods 1 and 2, 5" joint elongate triangular, being a little widened distally, 6% shorter, widest at beginning of palm, which is much longer than the hind margin, defined from it by an obtuse angle, finger about as long as palm. Peraeopods 1—5 very brittle, fringed with fascieles of setules, 4" joint shorter than 5tk, 6th much longer than either. Peraeopods 3 and 4, 24 joint rather small, narrowly oval. Peraeopod 5, 24 joint much wider above than below. Uropod 2 small. Uropod 3 long, pedunele well developed, rami narrowly lanceolate, outer a little the shorter, both densely spinulose and with setae 304 Haliragoides, Apherusa on inner margin. Telson shorter than pedunele of uropod 3, oval triangular, tridentate, the central tooth much the largest. Colour brilliant with red, orange and pure white. I. 10—14 mm. Arctie Ocean, North-Atlantie and North-Sea (Norway). Depth 188—564 m. 15. Gen. Apherusa A. Walker 1859 Paramphithoe (part.), R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.68 | 1861 Amphithopsis (part.), A. Boeck in: Forh. Skand. Naturf., Mode 8 p.661 | 1862 Gossea (Sp. un.: G. microdeutopa) (non L. Agassiz 1862, Coelenterata!), Bate (&Westwood), Brit. sess. Crust., v.1 p.276|1871 Halirages (part.), A. Boeck in: Forh. Selsk. ‘ Christian., 1870 p.194 | 1891 Apherusa, A. O. Walker in: Ann. nat. Hist., ser.6 ©.8 p-83 | 1893 A., G. O. Sars, Crust. Norway, v.1 p. 438. Head, post-antennal corners more or less produced. Side-plates of moderate size, encreasing in depth to the 4%. Antenna 1 shorter than antenna 2, without calceoli, no accessory flagellum. Upper lip rounded. Lower lip with small inner lobes. Mandible, molar strong, 34 joint of palp shorter than 24. Maxilla 1, inner plate with variable number of setae, outer with variable number of spines. Maxilla 2, inner plate the narrower, fringed on inner margin. Maxillipeds, inner plates large as compared with outer, outer fringed on inner margin with spine-teeth or slender spines, palp of moderate size. Gnathopods 1 and 2 not strong or differing much in size. Peraeopods 1—5 usually rather strongly built. Uropod 3, rami usually projecting beyond the others. Telson not large, entire. 7 species accepted, 3 doubtful. Synopsis of accepted species: 1 Back with some segments dentate — 2. Back with no segments dentate — 5. | Postero-lateral margin of pleon segment 3 smooth . 1. A.eirrus . . . p.304 2 X Postero-lateral margin of pleon segment 3 denti- | eulate — 3, 3 H Peraeon segment 7 dentate. ... - 2. 2 220. 2. A. tridentata . p.305 Peraeon segment 7 not dentate — 4. BIIGORTBIR 0 a LTE RE 3. A. bispinosa . p.305 Head, post-antennal corners strongly produced; telson Didambabs 774 Me Er N EN RET, 4. A. megalops . p.306 f Gnathopods 1 and 2, 5th joint much longer than 6th 5. A. glacialis . . p.307 Head, post-antennal corners slightly produced; telson ; | ß \ Gnathopods 1 and 2, 5th joint not longer than 6th — @. 6 | Antenna 1, 3d joint much shorter than 2d,.... 6. A. jurinei. . . p.307 Antenna 1, 3d joint not much shorter than 24. . . 7. A. georgiana . p.308 1. A. eirrus (Bate) 1862 Pherusa bicuspis (.P. eirrus Bate) (err., non Amphithoe b. Kröyer 1838!), Bate & Westwood, Brit. sess. Crust., v.1 p.253 f. | 1862 P. eirrus + P.b., Bate, Cat. Amphip. Brit. Mus., p. 143 t. 27 £.6; p. 144 t.27 £.7 | 1871 Halirages borealis, A. Boeck in: Forh. Selsk. Christian, 1870 p. 196 | 1876 H. b., A. Boeck, Skand. Arkt. Amphip., ©.2 p.340 t.23 £.6 | 1893 Apherusa b., G. O. Sars, Crust. Norway, v.1 p.441 1.155 f.2 | 1895 A. b.?, A. O. Walker in: Ann. nat. Hist., ser.6 v.15 p.468 | 1893 Acanthozone laeviuscula?, A. Della Valle in: F. Fl. Neapel, v.20 p.619. Pleon segments 1 and 2 each produced into a dorsal tooth. Head somewhat produced in front, but not rostrate, lateral and post-antennal ET er ia ee a ARTEN - ee a Se ka ge Apherusa 305 corners of little. prominence. Side-plates 1—3 rounded quadrangular, 4th obliquely rounded and little widening distally. Pleon segment 3, postero- lateral corners ending in a short blunt point, margin above smooth. Eyes small, round, black. Antenna 1, 1°* joint longer than 24 and 34 combined, flagellum 2—3 times as long as peduncle, 22-jointed. Antenna 2 longer, ultimate and penultimate joints of peduncle subequal, flagellum 2—3 times as long as peduncle. In J the underside of peduncle of antenna 1 and upperside of peduncle of antenna 2 have fascicles of setae (Bate’s figure; but flagellum of antenna 2 much longer than he represents). Gnathopods 1 and 2, 5tk joint shorter than the narrow oblong 6t%, which has a short rather oblique palm. Gnathopod 2 larger than gnathopod 1, having the 5th joint stouter and the 6t" longer. Peraeopods 1—5, 4 joint a little widened, shorter than 6", finger strong. Peraeopods 3—5, 24 joint oval, in peraeopod 5 oblong oval, much larger than in the other peraeopods. Uropod 3, rami not greatly longer than peduncle, extending much beyond uropod 2. Telson triangular, scarcely twice as long as broad, tip pointed, simple. Colour uniformly elaret-red. L. 7°5 mm. Arctic Ocean, North-Atlantie, North-Sea and English Channel (North-Norway, depth 11—19 m; Great Britain, among shore weeds). 2. A. tridentata (Bruz.) 1859 Paramphithoe t., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. o.3 nr.1 p.74 t.3 f.13 | 1861 Amphithopsis t., A. Boeck in: Forh. Skand. Naturf.. Mode 8 p.662 |; 1862 Dexamine t., Bate. Cat. Amphip. Brit. Mus.. p.376 | 1871 Halirages tridentatus, A. Boeck in: Forh. Selsk. Christian., 1870 p.196 | 1876 H.t., A. Boeck, Skand. Arkt. Amphip., ©.2 p.341 !1893 Apherusa tridentata, G.O. Br Crust. Norway, v.1 p.442 1.156 f.1 | 1895 Acanthozone EERIREE (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 614. Peraeon segment 7 and pleon segments 1 and 2 each produced into a dorsal tooth. Head, rostrum small, lateral corners rounded, sharply defined below, post-antennal corners prominent, acute. Side-plate 1, front corner rather angular, 1% —34 with lower margin minutely serrate, 4% much widened distally. Pleon segment 2, lower part of hind margin serrate, segment 3, postero-lateral corners sharply produced, margin above broadly lobed, cut into 12 upturned teeth. Eyes oval reniform, dark, larger in 9 than in oO. Antenna 1 in oO, about '/, length of body, 1° joint as long as 24 and 34 combined, flagellum rather over twice as long as peduncle, with 40 joints, 1°the largest. Antenna 2 nearly twice as long, ultimate and penultimate joints of peduncle subequal, flagellum slender, about thrice as long as peduncle. Mandible, molar strong. Gnathopods 1 and 2, 5tk and 6th joints slender, subequal, 6" slightly widening distally, palm short, defined by an obtuse angle. Peraeopods 1—5 moderately robust, 24 joint in peraeopods 3—5 oval, with serrate hind margin, largest in 5th pair. Uropod 3 reaching not greatly beyond the others; inner ramus rather the longer, outer edge bulging at the base. Telson oblong oval, not quite twice as long as broad, apical border irregularly serrate, with some of the teeth double. Colour mottled with a magnificent carmine red. L. 9 attaining 14 m. Arctie Ocean (Norway southward to Lofoten Isles). 3. A. bispinosa (Bate) 1857 Dexamine b., Bate in: Ann. nat. Hist., ser. 2 0.19 p.142 | 1871 Halirages bispinosus, A. Boeck in: Forh. Selsk. Christian., 1870 p-.195 | 1876 H.b., A. Boeck, Skand. Arkt. Amphip., v.2 p.338 t.23 f.9 | 1881 Pherusa bispinosa, Nebeski in: Arb. Inst. Wien, v.3 p. 146 | 1893 Acanthozone b., A.-Della Valle in: F. Fl. Neapel, v.20 p.609 t.3 £.5; t.17 £.22—-86 | 1893 Apherusa b., G. O. Sars, Das Tierreich. 21. Lief.: T.R.R, Stebbing, Amphipoda 1. 20 MEER ee B 306 \ Apherusa Crust. Norway, o.1 p.489 t.155 f£.1 | 1858 Amphitho& macrocephala, M. Sars in: Forh. Selsk. Christian., p. 142 | 1859 Paramphithoe elegans, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v8 nr.1 p.75 t.3 f.14 | 1861 Amphithopsis e., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.662 | 1862 Atylus bispinosus + Pherusa e., Bate, Cat. Amphip. Brit, Mus., p. 140 t.27 £.1; p.377 | 1868 P. pontica, Üzerniavski in: Syezda Russ. Est., Syezda 1 Zool. p. 110 t.8 £.15. Pleon segments 1 and 2 each produced into a dorsal tooth. Head. rostrum distinet, acute, lateral corners small, angular, post-antennal forming a short deflexed point. Side-plate 1 subangular in front, a little expanded distally. Pleon segment 2, postero-lateral corners acutely produced, segment 3, postero-lateral corners acute, margin above serrate, upper corner forming a sharp upturned point, followed by a deep sinus with a bidentate projection in it or margin above with only 4 teeth (Üzerniavski). Eyes large, roundish, dark brown. Antennal in O scarcely more than '/, as long as body, 1°t joint longer than 24 and 34 combined, flagellum nearly 4 times as long as peduncle, 30-jointed. Antenna 2 in O nearly twice as long, ultimate joint of peduncle rather longer than penultimate, flagellum long and slender. _Antennae 1 and 2 in C longer than in O, and setose on confronting edges of peduncle; antenna 2, flagellum with 60—70 joints (Boeck). Gmnathopods 1 and 2 in © slender, feeble, 5th joint in gnathopod 1 longer than 6%, in gnathopod 2 equal to it, 6!» joint narrow oblong, palm oblique, much shorter than hind margin. In C the hand is very often elongate piriform, narrowed at the hinge of the long weak finger, and the hand is longer than the wrist or 5th joint (Czerniavski). Peraeopods rather slender, spinulose, 24 joint in peraeopods 3—5 oval, hind margin slightly serrate, largest in peraeopod 5. Uropod 3 reaching much beyond the others, rami spinulose, inner rather the longer, its outer edge bulging at the base. Telson triangular, fully twice as long as broad, apex very minutely tridentate. Colour variable, brightly mottled. L. © 6 mm, longer in greater depths. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, France, Great Britain); Kattegat; Mediterranean. 4. A. megalops (O.Sars) 1882 Halirages m., G.O.Sars in: Forh. Selsk. Christian., _ nr.18 p.102 t.5 f.4 | 1893 Apherusa m., G.O. Sars, Örust. Norway, v.1l p.443 t. 156 f.2 | 1893 Acanthozone fulvocincta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.614. Pleon segments 1 and 2 each produced into a dorsal tooth. Head, rostrum obsolete, lateral corners little prominent, transversely truncate, post- antennal strongly produced, acute, upper edge serrulate. Side-plates 1—3 rather small, rounded quadrangular, slightly serrate below. Pleon segment 2, postero-lateral corners a little produced, segment 3, postero-lateral corners quadrate, margin above obliquely truncate, regularly serrate, the deep sinus above containing a simple projection within. Eyes very large, obliquely oval, nearly contiguous above, dark brown. Antenna 1 scarcely '/, as long as body, 1° joint as long as 24 and 34 combined, apically toothed, flagellum twice as long as peduncle. Antenna 2 twice as long, ultimate and pen- ultimate joints of peduncle equal, 1° joint of flagellum much the longest. Gnathopods 1 and 2 nearly as in A. tridentata (p. 305), peraeopods 1—5 rather more slender, uropod 3 also similar but rather more elongate, telson differing in the apical border, which has a rounded notch between two acute points. Colour semipellueid, tinged with orange, transversely banded with light red. L. © 11 mm. Varangerfjord [North-Norway]. Depth 94--123 m. = Dr, Bei ae Ba ad ee ee BIER >. N, er . Apherusa 307 5. A. glacialis (H.J. PR 1887 Amphithopsis g., H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p. 137 t.5 £.6—6e | 1894 A. g., T. Stebbing in: Bijdr. Dierk., v. 17 p-85 | 1895 Apherusa g., Ohlin in: Acta Univ. Lund., v.3] nr.6 p.46 | 1893 Acanthozone longimana (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 604. Body slender, back without dorsal teeth, except a pair of minute points on pleon segment 6. Head, rostrum obsolete, lateral corners rounded. Pleon segment 3, postero-lateral corners showing only an incipient tooth, margin above sligehtly convex. Eyes rather large, rounded, dark with light rim. Antennal scarcely '/, as long as body, 1°t joint as long as 24 and 34 combined, flagellum nearly thrice as long as peduncle. Antenna 2 rather longer, ultimate and penultimate joints of pedunele subequal. Maxilla 1, inner plate with 9 setae, outer narrow with 7 or 8 spines, slender, erowded. Maxillipeds, inner plates as large as outer and reaching as far, outer plates fringed on inner margin with spine-like setae, 1° joint of palp short, 24 broad, 4 short, with minute nail on the blunt apex. Gnathopods 1 and 2, 5tl joint long and narrow, but wider as well as much longer than the sublinear 6, which has a very short transverse palm and finger to match. Gnathopod 1 is longer than gnathopod 2, the extra length being in the 5tR and 6" joints. Peraeopods 1—5 not very elongate, 5t" considerably the longest, 24 joint in 3d—5th pairs oblong ovate. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami not greatly longer than peduncle, outer ramus very little shorter than inner. Telson little longer than broad, slightly narrowed a apex entire, furnished with a pair of setules. Colour yellowish red. L. 7—10 mm. Arctie Ocean, reaching lat. 76° 30° N. 6. A. jurinei (NM.-E.) 1830 Amphithoe j., H. Milne Edwards in: Ann. Sei. nat., v.20 p.376 | 1840 A. jurinii, H. Milne Edwards, Hist. nat. Crust., v3 p.30 t.1 f.2| 1891 Pherusa j., A. O. Walker in: Ann. nat, Hist., ser. 6 v.7 p.421 | 1893 Apherusa j., G. O. Sars, Crust. Norway, v.1 p.445 t.157 f.1 | 1895 A.j., A. O. Walker in: P. Liverp. biol. Soe., v.9 p.305 | 1843 Amphithoö norvegica, H. Rathke in: N. Acta Ac. Leop., v.201 p. 83 1.4 £.6 | 1859 Paramphithoe n., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.8 nr.1 p.77 | 1871 Calliopius norvegieus, A. Boeck in: Forh. Selsk. Christian., 1870 p.198 | 1876 C©.n., A. Boeck, Skand. Arkt. Amphip., 0.2 p.348 t.22 f.6 | 1862 Pherusa fuecicola (part.) (err., non Leach 1813/14!) + ?Gossea microdeutopa (Bate), Bate & Westwood, Brit. sess. Crust., v.1 p.255; p. 277 f. | 1862 P. f. (part.) + Calliope norvegica + ?G. mierodentopa, G. microdeutopa, Bate, Cat. Amphip. Brit. Mus., p-.145; p.150; p. 160, 387, 396 t.29 f.6 | 1891 Apherusa, A. O. Walker in: Ann. nat. Hist., ser. 6 v.8 p.83 | 1893 Acanthozone laeviuscula (part.), A. Della Valle in: F. Fl. - Neapel, v».20 p.602. Back without any dorsal teeth. Head, rostrum very small, lateral corners rounded, post-antennal acute, neither strongly produced. Side-plates 1—3 rounded quadrangular. Pleon segment 3, postero-lateral angles forming a short acute projection, the margin above a triangular smooth lobe (Milne Edwards). Eyes oval reniform, dark brown. Antenna-l about '/, as long as body, 1° joint not quite as long as 24 and 34 combined, flagellum twice as long as peduncle, 26—28-jointed. Antenna 2 about once and a half as long as antenna 1 (Milne Edwards: longer than antenna 1), ultimate and penultimate joints of peduncle equal, flagellum twice as long as peduncle, 1° joint longest. Gnathopods 1 and.2 rather feeble, 5t" joint shorter than 6*%, which is sub- fusiform, widest at beginning of palm, palm oblique, nearly equal to hind margin. Peraeopods 1—5 rather stout, finger curved, 24 joint in 3I—5th peraeopods oval, hind margin quite smooth. Uropod 3 extending but little (Milne Edwards: much) beyond the others, rami narrowly lanceolate. Telson triangular, not quite twice as long as broad, apex obtusely pointed, having 20* in Re IR 308 Apherusa, Schraderia on each side 2 minute spinules. Colour light straw-yellow, variegated with reddish orange. L. © 8 mm. North-Atlantie and North-Sea (Norway, France, Great Britain); Kattegat; Mediterranean. 7. A. georgiana (Pfeff.) 1888 Calliopius georgianus, Pfeffer in: Jahrb. Hamburg. Anst., v.5 p.116 t.2 f.6 | 1893 Atylus?, A. Della Valle in: F. Fl. Neapel, v.20 p.704. Except in size closely resembling A. jurinei (p. 307). Back of peraeon broad, rounded, hinder segments of pleon compressed, no dorsal teeth. Head, front obtuse angled, lateral corners transversely truncate. Side-plates 1—4 not very large, but size encreasing rapidly from 1° to 4%, Pleon segment 3, postero-lateral corners subquadrate. Eyes tending to rounded oval. Antennal, peduncle stout, 1°°—34 joints nearly equal in length, 24 and 3% distally some- what outdrawn, flagellum (in figure) shorter than peduncle, with about 25 joints, alternately weakly and strongly distally outdrawn. Antenna 2 much longer, ultimate joint of pedunele rather longer than penultimate, flagellum twice as long as that ofantenna 1, with about 38 joints. No calceoli mentioned. Mandible with prominent molar, palp rather short, 39 joint shorter than 24, curved, acute at apex. Maxilla 1, inner plate with 3 setae. Maxilla 2, inner plate narrower but rather longer than outer. Gmathopods 1 and 2, 5tk joint nearly as long as 6%, subdistally lobed, more strongly in gnathopod 2, 6% joint oval, narrow, palm seemingly weakly defined. Peraeopods 1 and 2 more slender than peraeopods 3—5, otherwise like them, 4th joint in all outdrawn. Uropods1 and 2, rami small, outer ramus the shorter; uropod 3, peduncle strong, smooth, rami serrate, spinose, reaching back much beyond the other uropods. Colour greenish grey. L. 17 mm. South-Atlantie (South Georgia). Under stones, in Florideae, ete. A. barretti (Bate) 1862 Pherusa b., Bate, Cat. Amphip. Brit. Mus., p. 146 t.27 f.9 (10 in text) | 1898 Acanthozone fulvocincta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 943. L. 12:5 mm. North-Atlantie. A.laevis (Hasw.) 1880 Pherusa l., Haswell in: P. Linn. Soc. N.S.Wales, v.4 p. 260 1.9 f.4. L. 9 mm. South-Pacifie (Kiama [New South Wales]). A.translucens (Chilton) 1884 Panoplaea t., Chilton in: Tr. N. Zealand Inst., v.16 p.263 t.21 f.3a—c | 1893 Acanthozone longimana (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 619. Closely related to Panoploea debilis (Leptamphopus BETELREL ERBE, p: 294): Chilton. L. 14 mm. Lyttelton Harbour [New Zealand]. Gen. Schraderia Pfeff. 1888 Schraderia (Sp. un.: 8. gracilis), Pfeffer in: Jahrb. Hamburg. Anst., »,5 p.141. 1 species. S. gracilis Pfeff. 1888 $.g., Pfeffer in: Jahrb. Hamburg. Anst., ©5 p.141 t.2 f.5 | 1893 Acanthozone?, Pontogeneia?, A. Della Valle in: F. Fl. Neapel, v.20 p.904. No description; only one figure. South-Atlantic (South Georgia). EEE a er u VE a Ba rer OR, TUT he Fre a RE. Pleustidae, Pleustes ! 309 23. Fam, Pleustidae 5 1874 Subfam. Pleustinae, Buchholz in: Zweite D. Nordpolarf., v.2 p.333 | 1888 _ Pleustidae, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 870 ! 1893 Paramphithoidae, G. ©. Sars, Crust. Norway, v.1 p.343.. Rostrum more or less prominent. Side-plates 5—7 small. Antenna 1 without accessory flagellum, longer than antenna 2, flagellum in both many- jointed. : Upper lip unsymmetrically bilobed. Lower lip, inner lobes eontinuous with outer, little prominent. Mandible, accessory plate sometimes wanting - on right, palp well developed, 34 joint falciform. Maxilla 1, inner plate small, _ with 1—4 setae. Maxillipeds, inner and outer plates rather small, not strongly armed, palp long. Gmnathopods 1 and 2 often alike, subchelate. Peraeopods 3—5, 24 joint expanded. Branchial vesicles rather small, simple. Uropod 3, rami longer than pedunele, slender, lanceolate, spinulose, outer shorter than inner. Telson small, entire or (very rarely) notched, boat- shaped. Sexual difference very slight. Marine. 5 accepted genera and 1 doubtful, 18 accepted species and 4 doubtful. Synopsis of accepted genera: 1 j Mandible, molar feebly developed — 2. \ Mandible, molar strongly developed — 3. Mandibular palp of moderate size; gnathopods 1 SB ED DOWOLEDL a ns 1. Gen. Pleustes. . . . p.309 2 | Mandibular palp large; gnathopods 1 and 2, of moderate Bizarr 2. Gen. Neopleustes . . p.311 E 8 | Maxillipeds, finger of palp strong... .. . 3. Gen. Mesopleustes . p.315 4 Maxillipeds, finger of palp slight — 4. = i:, Mandible, molar eompressed; maxilla 1, inner 4 A | DEBE WAHR TE a ee 4. Gen. Stenopleustes . p.316 E- | Mandible, molar ceylindrie; maxilla 1, inner 2 ee A ee 5. Gen. Sympleustes. . p.317 em 1. Gen. Pleustes Bate 1858 Pleustes (Sp. un.: P. tuberculata), Bate in: Ann. nat. Hist., ser.3 v.1 p.362 1876 P. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.299 | 1893 P., G.O.Sars, Crast. 2 Norway, v.1 p.343 | 1859 Paramphithoe (part.), R.M. Bruzelius in: Bvanaka Ak. Handl., E n. ser. v.d nr.1 p.68 | 1871 P., A. Boeck in: Forh. Selsk. Christian. .,„ 1870 p. 174. - . Coating indurated, with keels or tubereles. Rostrum large, flat. - — 8ide-plates 1—4 large, 4th emarginate behind. Antennae 1 and 2 not - _ elongate. Upper lip, lobes subequal, finely hirsute. Mandible, molar feeble, palp of moderate size. Maxilla 1, inner plate with 1 seta, outer with 9 spines. Maxilla 2, inner plate the wider. Maxillipeds, outer plates scarcely reaching beyond 1st joint of elongate palp. Gnathopods 1 and 2 powerful, 5'h joint short, produced to a narrow lobe, 6! large, oval, palm oblique, well defined, tufted with spines. Peraeopod 4 little longer than 34 and 5" little longer than 4, Telson broadly rounded at apex. 2 species accepted, 3 obscure. Nun EP: ui Mae er ad ee ni m das Ener u ERFRPASN ER ee a ee 310 Pleustes Synopsis of accepted species: Peraeon tricarinate, carinae medio-dorsal and latero- TORE nn ae a ER 1. P.panoplus . . . p.310 Peraeon quinquecarinate, with 5 longitudinal rows of teeth or tuberalas '.: 2.5. m ser . . . 2. P. cataphractus . p.310 1. P.panoplus (Kröyer) 1838 Amphithoe panopla, Kröyer in: Danske Selsk. Afh., v.7 p.270 t.2 f. 9a—i | 1846 Amphitoe p., Kreyer in: Voy. Nord, Crust. t.11 f. 2a—x | 1859 Paramphithoe p., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.8 nr. 1 p.69| 1862 Pleustes panoplus, Bate, Cat. Amphip. Brit. Mus., p.63 t.9 f.9 | 1874 P. p., Buchholz in: Zweite D. Nordpolarf., v.2 p.334 Crust.t.6 | 1893 P.p., G. O. Sars, Crust. Norway, v.1 p.344 t.121 | 1894 P. panopla, 'T. Stebbing in: Bijdr. Dierk., 0.17 p.28 (synonymy) | 1893 Acanthozone p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.607 t.59 £.19 | 1867 Amphithonotus cataphractus (err., non Stimpson 1853!), Packard in: Mem. Boston Soc., v.1 p. 298. Back dorsally carinate, strongly on peraeon, which also has lateral margins carinate; pleon segments 1—4 and 6 with a pair of dorsal projeetions, 1t— 34 with a tubercle on each side below these. Rostrum large, obtuse or subacute, slightly hollowed dorsally, carinate below; lateral corners of head subquadrate. Side-plate 4 acute angled below emargination, 5t" and 6th with quadrate hind lobe. Pleon segment 3 with postero-lateral angles acute, slightly produced. Eyes rather small, rounded oval, prominent, dark red. Antenna 1 short, 1° joint about as long as 24 and 32 combined, flagellum scarcely thrice as long as peduncle, with 26—45 joints. Antenna 2 still shorter, ultimate and penultimate joints of peduncle subequal, flagellum subequal to peduncle, with 20—26 joints. Gnathopod 1, palm much longer than hind margin of 6'% joint, finger only reaching 1° of 3 transverse rows of palmar spines. Gmnathopod 2 more powerful, narrow lobe of 5" joint more projecting, 6% much more dilated at junction of palm with hind margin (Sars appears to reckon the palms not from this angle, but from the point reached by the finger). Peraeopods 3—5, 24 joint oblong quadrangular. Uropod 3 not very long, inner ramus not twice length of outer. Telson at base constrieted and having on the upper face a triangular prominence, apical margin broadly rounded. Colour dark brown, or whitish, or variegated with shades of brown. L. 9 reaching 18—-27 mm. Arectie Ocean (widely distributed, depth 5—113 m); Nortlı-Atlantic (West-Norway from Bergen northwards, depth 19=56 m; South of Halifax [Nova Scotia], depth 155 m). 2. P. cataphractus (Stimps.) 1853 Amphithonotus e., Stimpson in: Smithson. Contr., v.6 nr.5 p.52 | 1876 Paramphithoe cataphracta, S. I. Smith & Harger in: Tr. Connect. Ac., v3 p.31 | 1876 Tritropis cataphractus, A. Boeck in: Skand. Arkt. Amphip., v.2 p.510 | 1888 Rhachotropis c.. T. Stebbing in: Rep. Voy. Challenger, v.29 p.278, 1720. Body robust. KRostrum very large, elongate triangular, pointed, curving downwards, concave above and with a sharp median ridge below. One strong median dorsal carina commencing on peraeon segment 1, becoming strongly dentäte on .the last peraeon segment, and ceasing on pleon segment 2; the next 2 carinae (proceeding outwards) are developed in the form of strong teeth on peraeon segments 6 and 7 and all pleon segments, being spine-like on pleon segment 2, and almost lamelliform on the last 4; the next carinae are sharp ridges, extending along the bases of the side-plates, and slightly continued on pleon segments 1 and 2; and“ the last or outer carinae are very short, extending only along the bases of a BE ae > A Te AR EE Yaz E er a A aim ing " rn "2 Bar ei a in a LE a en nn u ei“ Se Pleustes, Neopleustes 3ll uropods 1—3. Side-plates large, angular. Eyes very large, rounded, prominent, yellowish or vermilion, with a black dot in the middle. Antennae 1 and 2 short, slender, subequal. Gnathopods 1 and 2, 5tk joint slenderly produced, 6th large, oväte, dentate below, finger about ?/, length of 6% joint. Peraeo- pods 1—5 slender, peraeopods 3—5, 24 joint but slightly expanded. Uropods 2 and 3, outer ramus shorter than inner. Telson subquadrate. Colour very variable, generally dark reddish or brown, variegated and mottled with white, sometimes a uniform deep purple or pure white. When disturbed, rolls itself up, as if feigning death. L. 12:5 mm. Fundy Bay (Grand Manan). Depth 18 m. P. medius (Goes) 1866 Paramphithoe media, Goes in: Öfv. Ak. Förh., v.22 p- 528 t.38 f.13 | 1871 P. m., A. Boeck in: Forh. Selsk. Christian., 1870 p. 176 | 1876 Pleustes medius, A. Boeck, Skand. Arkt. Amphip., v. 2 p. 302 | 1893 Acanthozone pulchella (part.)?, A. Della Valle in: F. Fl. Neapel, v. 20 p. 605. L. about 8 mm. Arctic Ocean (Spitzbergen). Depth 38 m. P. oceidentalis (Stimps.) 1864 Amphithonotus o., Stimpson in: P. Ac, Philad., p. 158. Closely allied to P. panoplus and P. cataphraetus. L. 19 mm. North-Paeifie (North-America). P. tuberculatus Bate 1858 P. tuberculata, Bate in: Ann. nat. Hist., ser.3 v.1 p.362 | 1893 P. tuberculatus, G.O.Sars, Crust. Norway, v.1 p.344 | 1871 Paramphithoe panopla (err., non Amphithoe p. Kröyer 1838!), A. Boeck in: Forh. Selsk. Christian., 1870 p.176 | 1876 Pleustes panoplus, A. Boeck, Skand. Arkt. Amphip., v.2 p.303 | ?1894 P. panopla, T. Stebbing in: Bijdr. Dierk., v.17 p.28 | 1898 Acanthozone p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.607 | ?1858 Amphithoe panoploides, M.Sars in: Forh. Selsk. Christian., p. 138. Perhaps only an aged form of P. cataphraetus. L. 21 mm. Arectie Ocean. S 2. Gen. Neopleustes Stebb.*) 1859 Paramphithoe (part.), R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 ur.1 p.68 | 1866 Paramphithoö (part.), Go&s in: Öfv. Ak. Förh., v.22 p.523 | 1898 P., G. O. Sars, Crust. Norway, ®.1 p.346 | 1861 Amphithopsis (part.) + P. (part.), A. Boeck in: Forh. Skand. Naturf., Mede 8 p. 661, 662. Body slender, not indurated. Head more or less produced over antenna 1, post-antennal corners usually projecting acutely. Side-plates not power- fully developed. Antenna 1 usually long and much longer than antenna 2. Upper lip unsymmetrically bilobed, ineision oblique. Mandible, molar weak, palp very large. Maxillae 1 and 2 nearly as in Pleustes. Maxillipeds differing by joint 3 of palp distally attenuated, 4" spiniform. Gnathopods 1. and 2 feeble to moderately strong. Peraeopods more or less elongated. Telson hollowed above, carinate below. 7 species. *) Gen. nov. veoc, new, and Pleustes. Type is Amphitoe pulchella Kroyer (1846). 312 Neopleustes Synopsis of species: 1 Dorsum with teeth — 2. Dorsum without teeth — 3. Dorsum with 5 or more teeth . . .2...... 1. N. pulehellus . » p.312 Doraum with 8 teethi 27, US 2. N. boeckii . . . p.312 Dotsum with Sites... nr Een AR ö. N. bicuspis. . . p.813 Dorkım: with 1 Wolle Sa ren 4. N. monocuspis . p.313 3 Antenba I shot 5. N. brevicornis . p.313 Antenna 1 elongate —- 4. 4 | Gnathopods 1 and 2 feeble. .... 2». 2... 6. N. assimilis . . p.314 Gnathopods 1 and 2 moderately strong . . . - - 7. N. bairdi. . . . p.3l4 1. N. pulchellus (Krayer) 1846 Amphitoe pulchella., Kroyer in: Voy.Nord, Crust. t.10 f.2a—r | 1859 Paramphithoe p., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. «3 nr.1 p.70 | 1887 P.p., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.119 t.5 £.2—2b | 1893 P.p., G. O. Sars, Crust. Norway, v.1 p.346 t.122 f.1 | 1862 Pherusa p., Bate, Cat. Amphip. Brit. Mus., p. 143 t.27 £.5 | 1876 Pleustes pulchellus (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.306 (not fig.) | 1893 Acanthozone pulchella (part), A. Della Valle in: F. Fl. Neapel, 0.20 p.605 t.59 f.18 | 1876 Pleustes euacanthus, G. O. Sars in: Arch. Naturv. Kristian., v.2 p.256 | 1885 Paramphithoe ewacantha, G.O.Sars in: Norske Nordhavs-Exp., 0.6 Crust. I p. 168 t. 14 f. 3. Sharp compressed teeth on peraeon segments 5—7, sometimes also on 4 and others; similar teeth on pleon segments 1 and 2, an upturned lamellar expansion on segment 3. Head produced to rather broad blunt rostrum, post-antennal corners spiniform. Side-plate 1 tapering to blunt point, a little serrate behind, 24 more rounded apically, also serrate, hind margin of 4 very oblique, acute below emargination. Pleon segment 3, postero-lateral angles acutely produced, slightly upturned, hind margin straight, finely serrulate. Eyes moderate, irregular oval, dark red. Antenna 1 very long, 1° joint as long as 24 and 34 combined, flagellum 4 to 5 times as long as peduncle, with 90 joints, 1° longer than 34 joint of peduncle. Antenna 2 scarcely '/, as long as antenna 1, ultimate and penultimate joints of peduncle equal, flagellum about twice as long as peduncle. Gnathopods 1 and 2 rather feeble, 5th joint rather long, little expanded, 6! joint longer, oblong oval, widening distally a little, palm shorter than hind margin, forming with it a very obtuse angle. Gnathopod 2 the stronger. Peraeo- pods 1—5, finger strong, curved; peraeopods 3—5, 24 joint oblong oval, serrulate behind. Uropod 3, inner ramus long, outer more than '/, as long, much longer than peduncle. Telson very small, oval, with small dentiform projection on each side near apex. Colour whitish, pellueid, mottled with dark brown. L. O reaching 17 mm. Arctie Ocean, North-Atlantic, North-Sea and Skagerrak (Greenland, Iceland, Spitzbergen, Norway, Bohuslän). Depth 75—282 m. 2. N. boeckii (H. J. Hansen) 1876 Pleustes pulchellus (part.) (err., non Amphitoe pulchella Kroyer 1846!), A. Boeck, Skand. Arkt. Ampbhip., v.2 t.23 f.1 (not text) | 1893 Acanthozone pulchella (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.605 | 1887 Param- phithoe boeckii, H. J. Hansen in: Vid. Meddel., n. ser. 4 v.9 p. 121 t.5 f. 8—3b | 1893 P.b., G. O. Sars, Crust. Norway, v.1 p.348 t.122 f.2. Sharp compressed teeth only on peraeon segment 7 and pleon segments 1 and 2. Head produced to strongly carinate acute rostrum, post-antennal corners little produced. Side-plates not serrate, 1° apically rounded. Pleon segment 3, postero-lateral angles acutely produced, hind margin convex, Re . = N N Neopleustes 3l3 smooth. Eyes very large, rownded triangular. Antenna 1, 1° joint of flagellum shorter than 39 of peduncle. Gnathopods 1 and 2 less slender than in N. pulchellus, 6'% joint more regularly oblong oval. Peraeopods 1—5 less robust; peraeopods 3—5, 24 joint with hind margin smooth. Uropod 3, outer ramus little longer than '/, inner. Telson about twice as long as broad, apex without dentiform projections. Colour pale red (Holböll). In other points agreeing with N. pulchellus. L. Q scarcely more than 8 mm. Arctic Ocean (Greenland). Depth 9—113 m. 3. N. bicuspis (Kröyer) 1838 Amphithoe b., (Reinhardt in MS.) Kröyer in: Danske Selsk. Afh., v7 p.273 t.2 f.10a—e | 1859 Paramphithoe b., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.73 | 1887 P.b., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.122| 1893 P.b., G.O. Sars, Crust. Norway, v.1 p.349 t.123 f.1 | 1895 Bb. (part.), A.O.Walker in: P. Liverp. biol. Soe., v.9 p.303 | 1861 Amphithopsis b., A. Boeck in: Forh. Skand. Naturf., Mede 8 p.662 | 1876 Pleustes b., A. Boeck, Skand. Arkt. Amphip., v.2 p. 308 | 1893 Acanthozone pulchella (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 605. Not carinate, but dorsally toothed on pleon segments 1 and 2. Rostrum small, obtuse, post-antennal corners little produced. Side-plate 1 scarcely expanded distally. Pleon segment 3, postero-lateral angles forming a small tooth with sinus above. Eyes rather small, oval triangular, dark red. Antenna 1, 1° joint longer than 24 and 3% combined, flagellum 4 or 5 times as long as peduncle, 90-jointed. Antenna 2 much shorter, ultimate joint of peduncle scarcely as long as penultimate, flagellum about twice as long as peduncle, 60-jointed. Maxilla 1 with 1 seta (Bruzelius; Boeck: 3 setae) on inner plate. Gmathopods I and 2, 5tk joint short, lobe setose, 6!" rather large, as long as 24 joint, tapering a little, palm spinose, leaving scarcely any hind margin. Peraeopods 1—5 rather slender, spinulose; peraeopods 3—5 subequal, 24 joint oval, serrulate behind. Uropod 3, outer ramus scarcely more than half as long as inner, longer than peduncle. Telson nearly twice as long as broad, apex evenly rounded. Colour whitish, tinged with yellowish, mottled with reddish brown spots, but sometimes almost pure white. L. Qo 12—14 mm. Aretice Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland, Spitzbergen, Iceland, Labrador, Norway, Bohuslän, France, Great Britain); Kattegat. Depth 6—113m. 4. N. monoeuspis (O.Sars) 1893 Paramphithoe m., G.O. Sars, Crust. Norway, v.1 p.351 t.123 f.2 , 1895 P. bieuspis (part.). A. O. Walker- in: P. Liverp. biol. Soc., ©.9 p.308. Dorsal tooth only on pleon segment 2. Rostrum small, obtuse, post- antennal corners sharply produced. Side-plate 1 broad, distinetly expanded distally, with denticle at hind corner. Pleon segment 3, produced angles without sinus above. Eyes large, almost regularly oval. dark red. Antenna 1, 1% joint subequal to 24 and 34 combined. Gnathopods 1 and 2 stouter than in N. bicuspis. Peraeopods 1—5 rather strong, 4" longer than 34, 5th than 4th, Uropod 3, outer ramus much longer than '/, inner. Telson oval, not nearly twice as long as broad. Colour whitish, sparingly mottled, except in front of head and dark peduncles of antennae. L. © 11 mm. Arctic Ocean (Greenland, Hammerfest [Finmark]). Depth 56—94 m. 5. N. brevicornis (O. Sars) 1882 Paramphithoö b., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.98 t.4 £. 11, 11a | 1893 P. b., G. O. Sars, Crust. Norway, v.l p.853 t.124 f.2 | ?1887 P. gracilis, H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p. 124. RR, EA ge I a ei FE alle Sue en we FREE ee EEE SEN NE 2 514 Neopleustes Stout, compact, no dorsal projections. Rostrum very slight, post- antennal corners little produced. Side-plates 1—4 deep, 1° rather expanded distally, 15—3@ with dentiele at hind corner, 4! subquadrate below emargination. Pleon segment 3, postero-lateral corners subquadrate, point obtuse. Eyes small, rounded, dark red. .Antennae 1 and 2 unusually short. Antenna 1, 1° joint rather thick, as long as 24 and 34 combined, flagellum not twice as long as peduncle, 12-jointed. Antenna 2 a little shorter, ultimate and penultimate joints of peduncle subequal, together as long as flagellum. Gnathopods 1 and 2 moderately strong, closely alike, 5t" joint very short, lobe linguiform, 6!" very large, as long as 24 joint, widest at palm, which is as long as hind margin, convex, defined by projeeting angle and palmar spines. Peraeopods 1—5 moderately long and spinulose, very slender. Peraeopods 3—5, 2 joint oval, largest in peraeopod 5 with hind margin nearly straight. Uropod 3 comparatively short, outer ramus °/, as long as inner. Telson oblong triangular, not nearly twice as long as broad at base, apex obtuse. Colour whitish, more or less darkened with dark brownish violet. L. © searcely 4 mm. Aretie Ocean (North-Norway; Greenland?). 6. N. assimilis (O. Sars) 1882 Paramphithoe a., G. O. Sars in: Forh. Selsk. Christian., nr.18 p.99 t.5 £.1,1a | 1887 P.a., H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p.124 | 1893 P.a., G. O. Sars, Crust. Norway, v.1 p.352 t.124 f.1 | 1893 Acan- thozone pulchella (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 605. With no dorsal projeetions. Rostrum short, obtuse, post-antennal corners little produced. Side-plate 1 slightly expanded distally, 24 and 34 large, 1°t— 34 with denticle at hind corner, 4" acute below emargination, narrow distally. Pleon segment 3, postero-lateral corners acutely produced, but not into a tooth. Eyes rather large, rounded triangular. Antenna 1 very long, 1st joint longer than 24 and 3% combined, flagellum more than 4 times as long as peduncle. Antenna 2 much shorter, ultimate joint of peduncle longer than penultimate, flagellum about twice as long as peduncle. Gmnathopods 1 and 2 rather feeble, 5!" joint rather long and little widened, 6 longer than 5%, not nearly so long as 24, widest at palm, which is not nearly so long as spinose hind margin. Peraeopods 1—5 long and slender. Peraeo- pods 3—5, 24 joint oval, serrulate behind, in peraeopod 5 its hind margin very convex. Uropod.3, rami spinose, outer longer than peduncle, little over half as long as inner. Telson fully twice as long as broad, apex evenly rounded. L. © 8 mm. Aretie Ocean and North-Atlantie (West-Norway; Greenland, depth 19—113 m). 7. N. bairdi (Boeck) 1872 Paramphitho£ b., A. Boeck in: Forh. Selsk. Christian., 1871 p.45, 50 t.1 £.3. Dorsum without keel or teeth. Head a little outdrawn, forming no proper rostrum; post-antennal corners blunt. Side-plates 1—4 large, distally rounded, feebly serrulate on lower hind margin. Pleon segment 3, postero-lateral corners subquadrate. Eyes moderately large, oval, black. Antenna 1, 1° joint stout, longer than 24 and 34 combined, flagellum about thrice as. long as peduncle, 40—45-jointed. Antenna 2 much shorter, ultimate joint of peduncle longer than penultimate, flagellum much longer than peduncle, about 24-jointed. Mandibular palp, 39 joint much longer than 24, Maxilla 2, inner and outer plates small. Maxillipeds, outer plates not reaching Neopleustes, Mesopleustes 315 middle of palp’s 24 joint, palp’s 34 joint tapering distally, finger spine-like. “Gnathopods 1 and 2, 5% joint short, triangular, lobe rounded, 6* joint very large, oval, widest at junction of subequal palm and hind margin, larger in gnathopod 2 than in gnathopod 1. Peraeopods 3—5, 24 joint large, feebly serrate, 4" joint produced downward. Uropod 3, peduncle very short, rami spinose, outer about ®/, as long as inner. Telson oval. L. ?. North-Paeifie (California). 3. Gen. Mesopleustes Stebb. 1899 Mesopleustes (Sp. typ.: Pleustes abyssorum), T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p.209. | Coating indurated, carinate. Rostrum large. Side-plates 1—4 distally narrowed, 5tk and 6 with hind lobe deeper than front. Upper lip with small ‘oblique ineision. Mandible, accessory plate on both left and right, molar prominent, strong, oval, 34 joint of palp longer than 24. Maxilla 1, inner plate with 2 short and 2 long plumose setae, outer plate with 10 spines. Maxillipeds, inner plates with 3 .spine-teeth in a group at apical angle, outer plates scarcely reaching beyond 1° joint of palp, inner margin unarmed, apical with 6 close-set spines, 1% and 24 joints of palp equal, 34 rather shorter, as long as strong finger. Gnathopods 1 and 2 strong, 5 joint eup-like, 6! broad oblong oval, palm well defined. Gmathopod 2 larger than gnathopod 1. Peraeopods 1—5 robust, subequal. Telson subrotund. 1 species. 1. M.abyssorum (Stebb.) 1888 Pleustes a., T.Stebbing in: Rep. Voy. Challenger, ©.29 p.872 t.67 | 1893 Acanthozone a., A. Della Valle in: F. Fl. Neapel, 0.20 p.609 t.59 f.21 | 1899 Pleustes a., Mesopleustes sp. typ., T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 209. In general appearence resembling Pleustes panoplus (p. 310). Peraeon and pleon segments all carinate except 4! of pleon; segments imbricate, pleon segment 3 with erect dorsal tooth. Rostrum long, narrow, carinate below, lateral and post-antennal corners little projeeting. Side-plate 1 narrowly produced forward, 2 denticles on hind margin, 24—4t% successively encreasing in depth, vertically ridged, 4% with very oblique hind margin below emargination, 5!" with distally narrowed hind lobe. Pleon segment 3, postero-lateral corners produced into a small tooth. Eyes small, oval. Antennal, 1° joint a little longer than 24, 3 more than '/, as long as 24, flagellum with 44 joints, 1° longest. Antenna 2 much shorter, ultimate joint of peduncle rather longer than penultimate, flagellum with 24 joints, 1° longest. Gnatho- pods 1 and 2 spinose, 5tk joint as broad as long; gnathopod 1, 6! joint with palm divided between 2 broad shallow emarginations, finger reaching beyond them. Gnathopod 2 much larger, palm with deep cavity between its blunt end and a large tooth or process near the finger hinge. Peraeo- pods 1—5 nearly as in Sympleustes latipes (p. 317), but 24 joint oblong, hind margin sinuous, with much produced lobe. Uropod 3, outer ramus little longer than peduncle, only half length of inner. Telson short, as broad as long. L. about 17 mm (if fully extended). Southern Indian Ocean (near Marion Island). Depth 3013 m. 316 Stenopleustes 4. Gen. Stenopleustes 0. Sars 1893 Stenopleustes, G. O. Sars, Crust. Norway; v.1 p. 354. Body slender, smooth, thin-skinned. Rostrum and post-antennal corners: little produced. Side-plates not very large. Antenna 1 slender, much longer than antenna 2. Lips nearly as in Neopleustes (p. 311). Mandible, molar powerful, compressed, palp moderate. Maxilla 1, inner plate with 1 seta.. Maxillipeds, inner plates rather broad, outer plates small, with a few hairs, 34 joint of palp apically much produced. Gnathopods 1 and 2 imperfectly subchelate, not strong. Peraeopods 1—5 rather slender. Telson nearly as. in Neopleustes. 2 species. Synopsis of species: te 2 ER RE re A 1. 8. malmgreni . p.316 a u one ES a ea FE a a 2. 8.nodifer . . p.316 1. S. malmgreni (Boeck) 1871 Amphithopsis m., A. Boeck in: Forh. Selsk. Christian., 1870 p. 199 | 1876 A. m., A. Boeck, Skand. Arkt. Amphip., v.2 p.350 t. 23 f.7 | 1893 Stenopleustes m., &. O. Sars, Crust. Norway, ®.1 p.355 t.125 f.1 | 1893 Acanthozone longicaudata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 605. Pleon without nodules. Head, rostrum short, blunt, lateral corners angular. Pleon segment 3, postero-lateral corners quadrate. Eyes very large, reniform, light red. Antenna 1, 1° joint subequal to 24 and 34 combined, flagellum nearly 6 times as long as peduncle, 1° joint elongate. Antenna 2, ultimate joint of pedunele longer than penultimate, flagellum longer than peduncle. Gnathopod 1, 5tR joint rather longer than.oblong oval 6%", palm very oblique, spinose. Gnathopod 2 rather larger, 5t" joint rather shorter than 6th, Peraeo- pods 3—5, 24 joint large oval. Uropod 3, inner ramus 3 times as long as peduncle, outer much the shorter, both spinose. Telson en oval. Colour whitish, sometimes faintly cameous. L. Q 7 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway). Depth 150—282 m. 2. S.nodifer (O.Sars) 1882 Amphithopsis nodifera, G.O.Sars in: Forh. Selsk. Christian., nr. 18 p. 103 t.5 £.6a—b | 1893 Stenopleustesnodifer, G.O.Sars, Crust. Norway, v.1 p.356 t.125 £.2 | 1895 S.n., A. O. Walker in: P. Liverp. biol. Soe., v.9 p. 303 | 1893: Acanthozone nodifera, A. Della Valle in: F. Fl. Neapel, v.20 p. 604 t.59 £. 15. Pleon segments 1 and 2 ending dorsally in pair of juxtaposed nodi- form projections (often difficult to make out). Head, rostrum a little produced, lateral corners rounded. Pleon segment 3, postero-lateral corners somewhat produced. Eyes large, reniform, dark red. Antenna 1, 1° joint rather longer than 24 and 34 combined. Gnathopods 1 and 2, palm rather shorter than in S. malmgreni. Telson longer, triangular with narrowly rounded apex. Other points elosely agreeing with S. malmgreni. Colour whitish, pellucid, speckled yellowish or brownish; pedunele of antenna 1 and uropods 1—3 generally dark brown (Sars); limbs and specially peraeon segments 4—6 speckled with dark red (Walker. L. 2 3—5 mm. North-Atlantie, North-Sea and Skagerrak (Norway, depth 56-188 m; Great Britain, depth 57 m). Er al cn 3. au pn Male un Zi ec Al a nl an, Sympleustes 817 5. Gen. Sympleustes Stebb. 1861 Amphithopsis (part.), A. Boeck in: Forh. Skand. Naturf., Mode 8 p.661 | 1899 Sympleustes, T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 209. Not very slender. Rostrum small, post-antennal corners more or less projeeting. Side-plates moderate. Upper lip as in Neopleustes (p. 311). Molar of mandible strong, not compressed but eylindrical, palp rather large. Maxilla 1, inner plate with 2 setae. Other mouth-parts nearly as in Stenopleustes, but palp of maxillipeds variable, finger slight. Gnathopod 2 usually much stronger than gnathopod 1, and more distinetly subchelate. Peraeopods 1—5, stoutness varying. Telson entire or (in S. megacheir) notched. 6 species. Synopsis of species: 1 f Telson with notehed apex . .. ve... 1. 8. megacheir.. . . p.317 \ Telson with apex entire — 2. 9 Back not entirely smooth — 38. Back entirely smooth — 4. 3 With obtuse dorsal projeetion. .» 2» ..... 2. 8-latipes .. .. -:P:817 Wr Dartial ahrınh u ee nk 3. 8. grandimanus . p.318 4 Antenna 1, 1st joint with spiniform process. . . 4.8. glaber .:s... 9318 Antenna 1, 1st joint without spiniform process — 5. 5 Gnathopods 1 and 2, palm not ineised. . ... . 5. 8. pulchellus. . . p.319 Gnathopods 1 and 2, palm deeply ineised . . . 6. 8. olrikü. ... . p- 319 1. S. megacheir (A. Walker) 1897 Parapleustes m., A. O. Walker in: J. Linn. Soe., v.26 p.230 t.18 f.4-—4c. Pleon segment 2 having a small dorsal tooth. Side-plates 1 and 2 small, front angle of 1° acute. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes wanting. Antenna 1 about °, as long as body, 1% joint as long as 24 and 34 combined. Antenna 2 shorter, ultimate joint of peduncle rather shorter than penultimate. Maxillipeds strong, finger longer than 34 joint of palp; other mouth-parts not described. Gmnathopod 1, 24 joint not longer than 6*", 5tk shorter than ovate 6", both setose on hind margin, finger with distal half serrate. Gnathopod 2, 5t% joint short, cup-shaped, 6% very large, the long oblique palm having three erenate lobes and two 'sinuses, and being defined by a small tooth. Peraeopods 1—5 and uropod 3 as in S. pulchellus (p. 319). Telson spoon-shaped, apically notched for one quarter of its length. L. 8 mm. North-Atlantie (South-West of Ireland). Depth 1371 m. 2. S. latipes (Sars) 1858 Amphithoe I., M. Sars, in: Forh. Selsk. Christian., p-139 | 1871 Amphithopsis1., A. Boeck in: Forh. Selsk. Christian, 1870 p.200 | 1876 A.l., A. Boeck, Skand. Arkt. Amphip., v.2 p.355 t.22 f.4 | 1887 A.l., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.185 t.5 f.4 | 1893 Parapleustes l., G.O. Sars, Crust. Norway. v.1 p.360 t. 127 | 1897 P.1., J. Bonnier in: Ann. Univ. Lyon, v.26 p. 645 t. 38 f.3 | 1893 Acanthozone I. (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 608 t.59 f. 20] 1899 Amphithoe l., Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p:209| 1862 Calliope ossiani (Bate) + C. fingalli, Bate & Westwood, Brit. sess. Orust., v.1 p.261f.; p-263 f. | 1862 C.0.+0.f., Bate, Cat. Amphip. Brit. Mus., p.149 t.28 f.3; p. 377 | 1869 Calliopius 0.+C. f., A. M. Norman in: Rep. Brit. Ass., Meet. 38 p. 280, 281. Robust; peraeon segment 7 and pleon segments 1—3 each with obtuse dorsal projeetion, that in pleon segment 3 compressed gibbous. Head, 318 Sympleustes rostrum small, lateral corners emarginate, post-antennal corners little: produced. Side-plates 1—3 without denticle, 1° acute at lower front corner, 4th deep, narrow below, 5!" and 6tk with hind lobe much deeper than front. Pleon segment 3, postero-lateral corners subquadrate, obscurely produced. Eyes rather large, oblong reniform, dark red. Antenna 1, 1° joint longer than 24 and 39 combined, apically somewhat produced, flagellum about thrice as long as pedunele, 1° joint longer than 34 of peduncle, accessory flagellum rudimentary (Bonnier). Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum little longer than pedunele. Upper lip very unsymmetrical. Mandible, 3% joint of palp much longer than 24. Maxillipeds, 34 joint of palp fully as long as 24, apically acutely produced. Gnathopod 1 rather feeble, 5! joint distally broad, as long as 6!", palm well defined, equal to hind margin and almost at right angles to it, so that the joint is sub- triangular. Gnathopod 2 powerful, 5 joint short, cup-like, 6! very large, expanded distally, palm excavate between a small projection and a broadly truncate lobe armed with 5 stout spines, the point of the finger elosing into a groove between these and a similarly armed surface ridge. Peraeopods 3—5 very strong, 29 joint oval, hind margin quite smooth, nearly straight, 4 and 5! expanded, produced downward; all peraeopods spinose, with finger strong. Uropod 3, outer ramus °/, as long as inner. Telson distinetly boat- shaped, very small, apex evenly but not broadly rounded. Colour whitish, transversely banded with patches of dark brown, found also on peduncle of antennae and on legs. L. 9 reaching 12 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland, Norway, Great Britain), depth 56—830 m; Bay of Biscay, depth 1410 m. 3. S. grandimanus (Ühevreux) 1887 Amphithopsis grandimana, Chevreux in: Bull. Soc. zool. France, v.12 p.570 | 1899 A.g., Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.209 | 1898 Acanthozone latipes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 608. Said to be near to S. pulchellus. Compressed, pleon segments 1—3 slightly carinate. Head, rostrum very short, lateral corners rounded. Side- plates not deep. Pleon segment 3, postero-lateral corners almost quadrate. Eyes large, oval. Antenna1 long, 24 joint almost as long as 1°, 34 half as long as,24, flagellum with 53 joints, 1° long. Antenna 2, °”/, as long as antenna 1, ultimate joint of peduncle a little shorter than penultimate, flagellum 29-jointed. Mandible, 34 joint of palp very long. Gmnathopod 1, 5tt joint rather shorter than the broadly oval 6, Gmnathopod 2, 6 joint very large, elongate oval, front margin with strong sharp apical tooth, palm slightly erenulate, spinose, well defined by a strong tooth. Peraeopods 1—5 large, robust; peraeo- pods 3—5, 24 joint broadly oval, slightly produced downward, smooth behind. Uropods 1—3 elongate, outer ramus only a little shorter than inner. Telson very short, rounded. L. 8 mm. North-Atlantie (Cape Finisterre). Depth 510.m. 4. 8. glaber (Boeck) 1861 Amphithopsis g., A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 662 | 1871 Paramphithoe glabra, A. Boeck in: Forh. Selsk. Christian., 1870 p.175 | 1876 Pleustes glaber, A. Boeck, Skand. Arkt. Amphip., v.2 p.300 t.21 f£.1 | 1893 Parapleustes g., &.O. Sars, Orust. Norway, v1 p.358 t.126 £.1 | 1899 Amphithopsis g., Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.209 | 1866 Paramphithoe exigua, Goes in: Öfr. Ak. Förh., v.22 p.523 t.38 f.12 | 1898 Acanthozone pulchella (part.)?, A. Della Valle in: F. Fl. "Neapel, v.20 p. 605. | g ; ae Pa = a a 0 a Zr DT nd sn at T Da er = ne Sympleustes 319 Rather slender, smooth. Head, rostrum not large but distinet, lateral corners acute, post-antennal corners projecting spiniform. Side-plates 1—3 with tooth at lower hind corner, 5!" with hind lobe little deeper than front. Pleon segment 3, postero-lateral angles forming a little recurved tooth. Eyes moderate, rounded oval, dark red. Antenna 1, 1° joint much longer than 24 and 34 combined, with spiniform apical process, flagellum more than thrice as long as pedunele, 1° joint long. Antenna 2 much shorter, ultimate joint of peduncle longer than penultimate, flagellum not twice as long as pedunele. Upper lip not very unsymmetrical. Mandible, 34 joint of palp not greatly longer than 2%. Maxillipeds, 34 joint of palp shorter than 24, not apically produced. Gnathopods 1 and 2 not large, nor very unequal, 5% joint much shorter than 6!%, lobe narrowly rounded, densely setose, 6 oblong oval, palm very oblique, much longer than hind margin, defined by fascieles of strong spines. Peraeopods 3—5, 24 joint regularly oval, serrulate behind. Uropod 3, outer ramus more slender than inner, less than ?/, of its length. Telson oval, nearly twice as long as broad. Colour generally whitish, marbled with reddish brown patches. L. © about 6 mm. Arctie Ocean, North-Atlantic, North-Sea and Skagerrak (Greenland, Spitzbergen, Iceland, Murmen Coast, Norway); Kattegat. 5. S. pulchellus (0, Sars) 1876 Amphithopsis pulchella, G. O. Sars in: Arch. Naturv. Kristian., v.2 p.258 | 1885 A.p., G.O.Sars in: Norske Nordhavs-Exp., v. 6 Crust. I p. 175 t.14 £.6 | 1893 Parapleustes pulchellus, G. O. Sars, Crust. Norway, v.1 p-359 t.126 f.2 | 1899 Amphithopsis pulchella, Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.209 | 1893 Acanthozone latipes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 608. Not very slender, smooth. Head, rostrum very small, lateral corners angular, post-antennal corners little produced. Side-plates 1—3, dentiele nearly obsolete, 4 narrow below, 5t" and 6%, hind lobe much deeper than front. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes moderate, reniform, bright red. Antenna 1, 1° joint scarcely longer than 24 and 34 combined, not produced, flagellum about thrice as long as peduncle, 18 joint long. Antenna 2, ultimate and penultimate joints of peduncle sub- equal, flagellum not nearly twice as long as peduncle. Gnathopod 1 rather slender, 5tk joint nearly as long as 6!%, lobe broad, setose, 6!" slightly widening distally, palm much shorter than hind margin, imperfectly defined between 2 sets of 3 small spines. Gnathopod 2 much stronger, not much longer, 5tk joint short, lobe narrow, setose, 6!" slightly widening distally, palm rather sinuous, slightly oblique, much shorter than hind margin, well defined between 2 sets of 3 strong spines. Peraeopods 3—5, 24 joint large oval, smooth behind. Uropod 3, outer ramus about ?/, as long as inner, both with few marginal spines. Telson rather small; distinetly boat-shaped, apex narrowly obtuse. Colour whitish with small pinkish spots all over. L. © 7 mm. Arctic Ocean (Greenland, Spitzbergen, Iceland, Varangerfjord). Depth 94—877 m. 6. S. olrikii (H. J. Hansen) 1887 Amphithopsis o., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.136 t.5 £.5—5b | 1892 A. olriki,. Parapleustes (part.), G. O. Sars, Crust. Norway, v.1 p.357 | 1899 A. olrikii, Sympleustes (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.209 | 1893 Acanthozone latipes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 608. 320 Sympleustes, Parapleustes, Paramphithoidae Rather robust, smooth. Head, lateral corners obtuse. Side-plate 1 shallow, 24 —4th suecessively deeper, all 4 narrow distally, 5% with hind lobe much deeper than front. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes large, subreniform. Antenna 1, 1° joint longer than 24 and 34 combined. Antenna 2 little more than '/, length of antenna 1. Gnathopod 1 rather stout, 5% joint a little shorter and distally wider than 6th, 66th oblong, palm very oblique but well defined, near middle deeply and irregularly incised, incision armed with 2 spines. Gnathopod 2 rather _ longer and stronger, 5" joint like that of gnathopod 1, but 6tR as wide as 5th and much longer, palm rather oblique, defined by a tooth and palmar spines, and having a wide and deep almost semieireular ineision. Peraeo- pods 3—5 subequal in length, 24 joint oblong with rounded corners, 4th long, not broad. Uropod 3, outer ramus ?/, as long as inner. L. about 8 mm (mouth-organs and telson not described). Arctic Ocean (Greenland). Depth 94 m. Gen. Parapleustes Buchh. 1874 Parapleustes (Sp. un.: P. glacilis), Buchholz in: Zweite D. Nordpolarf., v.2 p. 337. | 1 species. P. gracilis Buchh. 1874 P. glacilis, P. gracilis, Buchholz in: Zweite D. Nord- polarf., v.2 p. 269, 337 Crust. t.7 f.1 | ?1887 Paramphitho& graecilis, H.J. Hansen in: Vid. Meddel., ser.4 v.9 p.124 | 1893 Acanthozone pulchella (part.)?, A. bicuspis, A. Della Valle in: F. Fl. Neapel, v.20 p. 605, 942. In many respects agreeing elosely with Neopleustes brevicornis (p.313). Mandible with no molar tuberele, excluding the species from Gen. Sympleustes (p. 317). L. 5 mm. ; Arctic Ocean (Sabine Island). Depth 19 m. 24. Fam. Paramphithoidae 1871 Subfam. Epimerinae, A. Boeck in: Forh. Selsk. Christian., 1870 p. 183 | 1888 Epimeridae, T. Stebbing in: Rep. Voy. Challenger, v.29 p.876 | 1893 E., G.O. Sars, Crust. Norway, v.1 p. 362. Integument indurated, processiferous (Fig. 74, p.327). Side-plates rigid, some acute. Eyes, when present, prominent. Antenna l shorter than antenna 2, flagellum in both many-jointed, accessory flagellum rudimentary or absent. Upper lip not deeply or not ineised. Lower lip, inner lobes coaleseing with outer or absent. Mandible, accessory plate on right as well as on left. Maxillipeds, outer plates broad, not long, scantily armed on inner margin, finger small. Mouth-parts in, general strongly developed. Gnathopods 1 and 2 (Fig. 75, 76, p. 327) not stout in structure, 5tk and 6tk joints narrow, finger small. Peraeopods 3—5, 24 joint not widely expanded. Uropod 3, rami lanceolate, longer than peduncle. Telson not large, entire or distally insinuate. Sexual difference very slight. Marine. Free swimming, rarely semiparasitie. 3 genera, 8 accepted species and 1 obscure. Paramphithoidae, Epimeria 321 Synopsis of genera: GE a re l. Gen. Epimeria . . p.321 Side-plates 4 and 5 not eombining to form a Side-plates 4 and 5 together forming a crescentic ; eurve — 2. a ee er OR E 2. Gen. Paramphithoe p. 324 Gnathopods 1 and 2 (Fig. 75, 76), 5th joint greatly Gnathopods 1 and 2, th joint rather shorter i | one Ban En 3. Gen. Actinacanthus p. 326 1. Gen. Epimeria A. Costa Pi 1793 Subgen. Gammarellus (part.), J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p. 106 | ?1847 Vertumnus (Sp. un.: V. eranchii) (nom. nud.), (Leach in MS.) A. White, Crust. Brit. Mus., p.89 | 1851 Epimeria (Sp. un.: E. trieristata), (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p.46 | 1888 E., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 877 | 1893 -E., G. ©. Sars, Crust. Norway, v.1 p.363. Body rather stout, with dorsal projections. Head with acute curved @ rostrum, lateral corners weak, post-antennal deflexed, obtuse. Side-plates 1—3 i strongly tapering, grooved, 4 deep, with large upper emargination and larger one below defined by 2 acute points, 5tk produced acutely or sub- acutely backward, its lower margin prolonging the arch of side-plate 4, 6! rather acute at hind corner, 7! rounded. Eyes prominent, not strongly developed. Antenna 2 not elongate. Mandible, molar small, normal, palp not very large. Maxilla 1, inner plate with many setae. Maxilla 2, inner and outer plates broad, short, obliquely truncate, densely fringed, inner shorter, not narrower than outer. Maxillipeds, inner and outer plates pretty well developed, outer serrulate on inner margin, fringed with spines and setae, palp not very large. Gnathopods 1 and 2 similar, subequal, rather small, palm of 6tk joint short. Peraeopods 1—5 not robust; in peraeopod 3 24 joint narrow, in peraeopods 4 and 5 not greatly expanded; peraeopod 5 a little shorter than peraeopod 4. Uropods 1—3, rami lanceolate, spinu- lose, rami of uropod 3 large, equal. Telson rounded quadrangular, apex emarginate. 4 speeies. Synopsis of species: 4 Pleon segment 3, postero-lateral angles strongly 1 produced, no accessory tooth . . » 2» .... l. E. parasitica . . p.321 Pleon segment 3, postero-lateral angles weakly produced, an accessory tooth above — 2. _ 9 j The whole peraeon carindte - . . . 2... 7. 2. E. loricata . . . p.322 \ Only hinder part of peraeon earinate — 3. 3 { Side-plates 1-5 with aeute apices . . .. . . . 3. E. cornigera . . p.323 Side-plates 1—5 with obtuse apices . . .... . 4. E. tuberculata . p. 323 1. E. parasitica (Sars) 1858 Amphitho£ p., M. Sars in: Forh. Selsk. Christian., p- 131 | 1861 Acanthosoma p., ?A. tricristata, A. Boeck in: Forh. Skand. Naturf., Mode 8 p.665, 666 | 1862 Acanthonotus parasiticus, Bate, Cat. Amphip. Brit. Mus., p-375 | 1893 Epimeria parasitica, &. ©. Sars, Crust. Norway, v.1 p.366 t.129 f.1 | 1871 E. cornigera (err., non Gammarus corniger J. C. Fabrieius 1779)), A. Boeck in: Forh. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 21 322 Epimeria Selsk. Christian., 1870 p.185 | 1888 E.c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.318 | 1893 Acanthonotosoma cornigerum (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 676. Dorsal carina from peraeon segment 5 to pleon segment 4, the denti- form projection encreasing in strength on successive segments, subdorsal carinae ending in a small tooth on each side of the segments. Head, rostrum reaching slightly beyond 1° joint of antenna 1, post-antennal corners subacute. Pleon segments 1 and 2, postero-lateral corners with 2 projecting angular points, segment 3, postero-lateral corners acute, strongly produced, without upper projecting point. Eyes rather large, piriform, brilliant carmine. Antenna 1 not very long, 1° joint longer than 24 and 3% combined, flagellum about twice as long as peduncle, 20-jointed. Antenna 2 not much longer, ultimate and penultimate joints of pedunele subequal, flagellum twice as long as peduncle. Gnathopods 1 and 2, 5t% joint as long as 6", 6th slightly widening to not very oblique palm. Peraeopod 5, 24 joint as long as 31 —6tk combined, widened except at distal end, which is produced to small acute lobe. Uropod 3, rami long, not very broad, spinules few. Telson oblong oval, apical margin insinuate, not deeply. Colour dark red, especially at hind margin of segments. L. Q about 9 mm. North-Atlantic, North-Sea and Skagerrak (South- and West-Norway). Semi- parasitic on Holothuria tremula Gunn. 2. E.loricata O.Sars 1872 E.coniger (nom. nud.), Whiteaves in: Ann. nat. Hist., ser. 4 v.10 p.347 | 1874 E. cornigera (err., non Gammarus corniger J.C. Fabrieius 1779!), Whiteaves in: Amer. J. Sei., ser.3 0.7 p.213 | 1893 Acanthonotosoma cornigerum (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.676 | 1879 Epimeria loricata, G.O. Sars in: Arch. Naturv. Kristian., v.4 p.450 | 1885 E.l., @.O.Sars in: Norske Nordhavs- Exp., ©.6 Crust. I p.166 t.14 f.2 | 1888 E.1., T. Stebbing in: Rep. Voy. Challenger, v.29 p.878 t.68 | 1893 E.l., G. O. Sars, Crust. Norway, v.1 p.368 t.129 f.3 | 1883 E. conspicua, T. Stebbing in: Ann. nat. Hist., ser.5 v.11 p. 204. Much indurated, carinate from peraeon segment 1 to pleon segment 4, laminar, obtuse, backward produced processes, encreasing in size successively to pleon segment 1, on 24—4th more acute, on 4tk diminished in size; peraeon segments 1—7 with subdorsal lateral tuberele, pleon segments 1—3 with 4 lateral tubereles, 4t{h with one and a ridge, 5tk and 6tk centrally faintly carinate. Head not carinate, rostrum very long, acute, reaching end of peduncle of antenna 1. Pleon segments 1—3, postero-lateral angles acute, with another tooth above the produced point, pleon segment 2 with tooth at antero-lateral corner. Eyes very prominent, rounded or oval, rich vermilion. Antenna 1, 1° joint longer than 24 and 34 combined, flagellum nearly thrice as long as peduncle, with about 30 joints, 1° Jongest, accessory flagellum 1-jointed, almost rudimentary. Antenna 2 not much longer, ulti- mate joint of peduncle shorter than penultimate, flagellum with 50 joints or more, 1° Jongest. Upper lip faintly insinuate at narrowed apex. Maxilla 1, inner plate with 9 setae, outer with 11 spines. Gmnathopods 1 and 2 stronger than in other species of the genus. Gmathopod 1, 5tk joint nearly as long as 6, twice as long as broad, 6tk oblong, a little widened at the short, serrate, almost transverse palm, finger armed on inner margin with 12 spines. Gnathopod 2 like gnathopod 1, but 6! joint longer. Peraeopods 3 and 4, 24 joint deeply grooved behind; peraeopod 5, 24 joint not equal in length to 34 —6th combined, expanded above, produced into a narrow lobe below. Uropod3, rami long, broad, ending very acutely. Telson little longer than broad, Epimeria 323 triangularly ineised but not deeply between 2 triangular apices. Colour magnificent coral-red, more vivid on hind margin of segments. L. reaching 40 mm. Aretie Ocean and North-Atlantie (Greenland; Spitzbergen; North-America; Hasvig [West-Finmark], depth 150—282 m). 3. E. cornigera (F.) 1779 Gammarus corniger, J. C. Fabrieius, Reise Norweg., p-383 | 1788 Cancer (@.) e., J. F. Gmelin, Syst. Nat., 0.5 p.2992 | 1793 ©. (Gamma- rellus) c., J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p.141 | 1871 Epimeria cornigera, A.Boeck in; Forh. Selsk. Christian., 1870 p.185 | 1893 E.c., G. O. Sars, Crust. Norway, v.1 p.364 t.128 | 1893 Acanthonotosoma cornigerum (part.), A. Della Valle in: F. Fl. "Neapel, v.20 p. 676 t.59 £.85 | ?1847 Vertumnus cranchii (nom. nud.), (Leach in MS.) A. White, Crust. Brit. Mus., p.89 | ?1850 Acanthonotus testudo, A. White in: P. zool. Soe. London, v.18 p.97 t.16 | 1851 Epimeria trieristata, (A. Costa in:) F. W, Hope, Cat. Crost. Ital., p.46 | 1857 Acanthonotus owenit, Bate in: Ann. nat. Hist., ser.2 v.19 p.141. Front part broadly arched, back carinate from peraeon segment 5 to pleon segment 4, the keel forming in each segment an acute backward directed tooth, in pleon segment 4 the back indented in front of the tooth. There is also a similar but much slighter subdorsal keel on either side from peraeon segment 6 to pleon segment 3. Rostrum reaching beyond 1° joint ofantennal. Side-plates 1—5 with acute apices. Pleon segments 1—3 each having two rather distant teeth at postero-lateral corners. Eyes very prominent, rounded, bright carmine. Antenna 1, 1° joint longer than 24 and 34 combined, flagellum about thrice as long as peduncle, 40-jointed, accessory flagellum 1-jointed, almost rudimentary. Antenna 2 not much longer, ulti- mate and penultimate joints of peduncle subequal, flagellum about twice as long as peduncle. Gnathopods 1 and 2 rather feeble, 5t% joint longer than 6%, palm small, joining hind margin by a rounded angle. Peraeo- pods 1—5, uropods 1—3 and telson nearly as in E. loricata, but telson scarcely at all longer than broad. Colour whitish with reddish tinge, hind rim of each segment and tips of 4 and 5th side-plates pink. L. reaching 16 mm. North-Atlantie and North-Sea (West-Norway at least up to Trondhjemsfjord, depth 94—282 m; France; Great Britain); Mediterranean. 4. E. tuberculata O.Sars 1893 E.t., G. O. Sers, Crust. Norway, v.1 p. 367 t. 129 £.2. Front part broadly arched, carina from peraeon segment 6 to pleon segment 4 with rather blunt projeetions, subdorsal keels very slight without dentiform projections, pleon segment 4 with a lateral ridge. Rostrum little overlapping 1° joint of antenna 1. Side-plates 1—3 and 5 with blunt apices, 4 Jess produced and less distinctly faleiform than in other species. Pleon segments 1—3 with 2 distant, not very sharp, teeth at postero-lateral corners. Eyes rounded, light carmine. Antenna 1 short, 1° joint much longer than 24 and 34 combined, flagellum about twice as long as peduncle, 24-jointed. Antenna 2 considerably longer, ultimate joint of peduncle shorter than penultimate, flagellum 2%/, times as long as peduncle. Gnathopods 1 and 2, 5tk joint considerably longer than 6%, which is narrow, scarcely widening distally,. Peraeopod 5, 24 joint not nearly as long as remainder of leg, ending in a blunt lobe. Uropod 3 as in E. cornigera. Telson rather broad, scarcely longer than breadth at base, slightly emarginate between 2 blunt apices. Colour whitish with faint rosy tinge (Sars), clear 21* a ee Fr En ee nr an) ER a 2 Be Ne 5 N er eh ee 324 Epimeria, Paramphithoe white variegated by a peculiar, very pretty shade of chocolate brown (T. Seott, MS.). L. reaching 16 mm. North-Atlantic and North-Sea (West-Norway, depth 282—376 m; Ailsa Craig in Firth of Clyde). 2. Gen. Paramphithoe Bruz. 1835 Acanthosoma (Sp. un.: A. hystrix) (non J. Curtis 1824, Hemiptera!), (Rich. Owen in MS.) J. ©. Ross in: John Ross, App. sec. Voy., nat. Hist. p.91 | 1859 Param- phithoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.68 | 1871 Acanthozone (Sp. un.: A. cuspidata), A. Boeck in: Forh. Selsk. Christian., 1870 p. 184 | 1893 A., G. O. Sars, Crust. Norway, ®.1 p. 369 | 1893 A. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.599 | 1894 A., T. Stebbing in: Bijdr. Dierk., v. 17 p. 29. Body indurated, beset with acute processes. Head, rostrum very small, post-antennal corners spiniform. Side-plates 1—3, 6 and 7 forming one acute lobe, 4 and 5tl with 2 acute lobes. Eyes prominent. Antenna 2 elongate. Upper lip apically narrow, slightly insinuate, symmetrical. Lower | lip with well formed inner plates coalescent on their outer margins with the outer plates. Mandible powerful, all parts normal, eutting plates bluntly dentate, spine-row of about 15 slender spines, 34 joint of palp shorter than 2. Maxilla 1 with about 10 setae on inner plate, 11 spines on outer. Maxilla 2, inner plate fringed along much of inner margin, rather shorter and narrower than outer. Maxillipeds, inner and outer plates rather broad, outer closely fringed with spines on apical margin, 29 joint of palp much the longest, finger small. Gnathopods 1 and 2 rather feeble, narrow, 5% joint shorter than 6b, finger small. Peraeopods 3—5, 24 joint with acute processes on hind margin. Uropod 2, rami unequal, shorter than in uropods 1 and 3; uropod 3, rami long, lanceolate. Telson rather elongate and boat-shaped. 3 accepted species, 1 doubtful. Synopsis of accepted species: 1 I Bosträm elongatle 2; De ee ae 1. P. buchholzi .. . . p. 324 Rostrum short — 2. Peraeon segments 1—4 with elevated tooth on . | hiad magih. 2. eier are 2. P.hystrix. . : . p.325 . | Peraeon segments 1—4 without elevated tooth on KEN EIER N a a er 3. P. polyacantha . p.325 1. P. buchholzi (Stebb.) 1874 Acanthozone hystrix (err., non Acanthosoma h. J.C. Ross 1835!), Buchholz in: Zweite D. Nordpolarf., v.2 p. 362 Crust. t. 11 | 1888 A. buchholzi, T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 162, 467 | 1894 4A. b., T. Stebbing in: Bijdr. Dierk., «. 17 p.31 | 1893 A. euspidata (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 613. Peraeon segment 1 with 7 acute processes in front, the medio-dorsal largest, pointing upward and forward, and 5 on hind margin; segments 2—7 with 5 processes of hind margin. those on segments 5—7 pointing backward, the middle one with a subsidiary tooth near the top. Pleon segments 1—3 with a similar eentral process, and on either side of it in segment 1 with 4 sharp processes on the hind margin, in segment 2 with 6, in segment 3 with 3; segment 4 has a central lobe not acutely produced and at the postero- lateral corners a sharp process, which is repeated on segment 5. Head, rostrum straight, pointing slightly upward, overlapping 1° joint of antenna 1, Paramphithoe 325 lateral and post-antennal anglies alike sharply outdrawn. Side-plates 1 and 3 apically serrate in 4 teeth, plates 2, 5 and 7 each with 2 denticles, 4th and 5tb irregularly sculptured below. Eyes round. Maxilla 2, inner plate rather broader than outer(?). Gnathopods 1 and 2 feeble, subequal. Peraeo- pods 3—5, 24 joint with 3 acute processes of the hind margin in peraeo- pod 3, with 4 in peraeopods 4 and 5. Telson longer than breadth at base, tapering, with a triangular emargination between 2 triangular apices. Colour uniformly pale reddish yellow. L. 22:5 mm (29 antenna 23 mm long). Arectie Ocean (Greenland). Depth 56 m. 2. P. hystrix (J.C. Ross) 1835 Acanthosoma h., (Rich. Owen in MS.) J. C. Ross in: John Ross, App. sec. Voy., nat. Hist. p.91 t.» f.4—7 | 1838 Amphithoe h., Kröyer in: Danske Selsk. Afh.. ©. 7 p. 259 t.2 f.7 | 1859 Paramphithoe h., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. 0.3 nr. 1 p.71 | 1877 Acanthozone h., Miers in: Ann. nat. Hist., ser. 4 v. 19 p.136; v.20 p.100 | 1888 A.h., T. Stebbing in: Rep. Voy. Challenger, v.29 p.50, 318, 466 | 1894 4A. h., T. Stebbing in: Bijdr. Dierk., v.17 p-29 | 1871 A. cuspidata (err.?, non Oniscus cuspidatus Lepechin 1780!), A. Boeck in: Forh. Selsk. Christian., 1870 p.184 | 1876 A.c., A. Boeck, Skand. Arkt. Amphip., v.2 p.229 t.20 f.3 1893 A.c., G. O.Sars, Crust. Norway, v©.1l p.370 t.130 | 1893 4. ce. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.613 t.59 f. 25. Body nearly eylindrie. Peraeon segment 1 with large laminar carinate process completely overarching the head, a smaller subdorsal process on either side, segments I—7 with 5 processes from transverse ridge of hind margin as in A. buchholzi. Pleon segments 1—3 with similar central process, and on either side of it in segments 1 and 2, 4 sharp processes, the 2 upper much larger than the 2 lower, in segment 3 two on each side which are subequal, segment 4 with sharp median and postero-lateral processes, segments 5 and 6 with acute process at postero-lateral angles but no dorsal process. Head, rostrum very small, horizontal, lateral corners forming a subtruncate lobe, post-antennal corners sharply outdrawn. Side-plates 1—3 acutely produced at apex, not serrate, 4 with 2 acute processes pointing downward, 5tR with 2 pointing backward, 6!" and 7 with 1 acute process. Eyes prominent, rounded, dark brown (Sars) or white (Bate). Antenna 1, 1° joint as long as 24 and 34 combined, with large apical process, flagellum about 3 times as long as peduncle. Antenna 2 much longer, joints of pedunele produced to dentiform projections, ultimate and penultimate joints of peduncle subequal, flagellum nearly 4 times as long as peduncle. Gnathopods 1 and 2 subequal, 5th joint slightly shorter than 6%, 6" widening a little distally, palm nearly transverse, finger small. Peraeopods 3—5, 24 joint with only 2 acute processes of hind margin. Telson as long as once and a half breadth at base, tapering, slightly (more than in figure by Sars 1893) emarginate. Colour light straw- yellow, mottled with brown. L. reaching over 30 mm. Aretice Ocean, widely distributed; North- Atlantic (North- America; Norway, Trondhjemsfjord and northward). 3. P. polyacantha (J. Murdoch) 1885 Acanthozone p., J. Murdoch in: P. U. S. Mus., v.7 p. 520 | 1893 A. cuspidata (part.)?, A. Della Valle in: F. Fl. Neapel, v. 20 p. 613. Peraeon segment 1, anterior margin raised into a ridge eurving for- ward over the head, segments 1—5, hind margin raised into a rounded ridge, developing into a median tooth on segment 5. Peraeon. segments 6 and 7 and pleon segments 1—4 having on hind margin broad median tooth pointing backward, largest on pleon segment 3, nearly obsolete on segment 4, 326 Paramphithoe, Actinacanthus and postero-lateral angles produced acutely backward; peraeon segments 6 and 7 and pleon segments 1 and 2 with small intermediate tooth on each side, peraeon segments 1—5 with lateral margin deeply carinate. Head, rostrum very short, sharp, post-antennal corners spiniform. Side-plates with spiniform process. Pleon segment 2, postero-lateral corners bidentate. Eyes round, prominent. Antenna 1 about °/, as long as antenna 2. Gnatho- pods 1 and 2 slender, subchelate. Telson rather long, entire. Aretie Ocean (Point Franklin [aretie Alaska]). Depth 24 m. P. euspidata (Lepech.) 1780 Oniscus cuspidatus, Lepechin in: Acta Ac. Petrop., 1778 v.1t.8 £.3 | 1877 Acanthozone cuspidata, Miers in: Ann. nat. Hist., ser. 4 ©.19 p. 136; v.20 p.100 | 1888 A. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.49 (with copy of Lepechin’s fig.). ? Perhaps identical with P. hystrix (p.825). L. 20 mm. White Sea. 3. Gen. Actinacanthus Stebb.*) 1888 Acanthechinus (Sp. un.: A. tricarinatus) (non P. M. Duncan & P. Sladen 1882, Echinodermata!), T. Stebbing in: Rep. Voy. Challenger, v.29. p. 883. Body indurated, beset with acute processes (Fig. 74). Head, rostrum very small. Side-plates 1—4 acute, 31 — 7! furnished with acute backward pointing lobes. Antennae 1 and 2, some joints of peduncle with acute projeetions. Upper lip apically broad, rather unsymmetrically bilobed. Mandible, spine- row abnormal, molar very prominent, palp elongate. Maxilla 1, inner plate with 3 setae, outer with 7 spines, palp long. Maxilla 2, plates broad, outer the broader. Maxillipeds, inner plates well developed, outer rather broad, reaching a little beyond 1°t joint of palp, thinly furnished with setae, 1° joint of palp rather longer than 24, finger slight, short. Gmathopods 1 and 2 (Fig. 75, 76) very long and thin, 5" joint much longer than subchelate 6'h, finger very small. Peraeopods 3—5, 24 joint channelled, others deeurrent. Uropod 3, rami long, lanceolate. Telson short, entire. Branchial vesieles simple. Marsupial plates long, narrow. l species. 1. A. tricarinatus (Stebb.) 1883 Acanthozone tricarinata, T. Stebbing in: Ann. nat. Hist., ser.5 v.11 p.205 |! 1893 A.t., A. DellaValle in: F. Fl. Neapel, v.20 p.601 1.59 f,11 | 1888 Acanthechinus tricarinatus, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 884 t. 69, 70. Body eylindric, except hinder part of pleon which is a little depressed and strongly flexed. Peraeon segments 1—7 (Fig. 74) each with central and 2 lateral acute, 3-sided, serrate, processes connected by transverse ridge on hinder part of segment; central process on segment 1 bifureate, one arm pointing forward, the other backward. Pleon segments 1 and 2 with large central process flanked by 2 tubercles on each side, 39 with smaller central process and 1 tuberele, and having a tridentate process rising from hind margin; 4'h with hump, depression, and 2 serrate processes in succession; 5! unarmed; 6" with central and 2 lateral . processes. Side-plates 1 and 2 pointing forward, tapering, carinate, serrate; 34 and 4 with both lobes acute, pointing backward; 7! with the largest lobe. Eyes not perceived. Antenna 1, 1° joint *) Nom. nov. AKtic, ray, üxavbo, spine. — The name Acanthechinus is preoceupied (1882, P.M. Duncan & W. P. Sladen in: Pal. Ind., ser. 14 p. 34). Actinacanthus, Atylidae 327 ‚distally dilated, produced into 3 long processes, 24 joint subequal to 1, ‚produced into 2 long processes, 32 joint short, flagellum with 1° joint long, longer than shaft of 18 or 24 joint ofpeduncle. Antenna2 with 2 large processes on basal joint, with 1 long and 2 short on antepenultimate, 2 long and 2 short on penultimate, 2 very small on ultimate joint, which is longer than shaft of penultimate, flagellum rather longer than pedunele, with about 12 joints, 1° very long. Mandible, spines of spine-row extremely unequal, 1° joint of palp with tooth-like process, which seems to be movable, 34 joint rather longer than 24, spinose. Gmathopod 1 (Fig. 75), 29 joint the thickest part of the limb, 5tk joint stouter and much longer than 6%, which is about 5 times as long as its greatest breadth, tapering to minute obligue spinose palm, finger very small, with tooth and 5 joint ---L- Fig. 75. Fig. 76. Fig. 74. Section through peraeon segment 3. . Gnathopod 1. Gnathopod 2. Fig. 74—76. A. tricarinatus. slender nail overlapping palm. Gmathopod 2 (Fig. 76) rather ‘similar to gnathopod 1, but much longer, 5t% joint not thicker than 6 but 3 times as long, 6! of uniform widtb, otherwise nearly as in gnathopod 1, palm less spinose. Peraeopods 1—5 with finger short, broad, spinulose. Peraeo- pods 3—5, 2@ joint with 4 longitudinal ridges, below overlapping 34 joint with rounded lobe, 3I—6th joints carinate in front, 4! and 5t" sharply deeurrent. Peraeopod 5 rather longer than peraeopod 4. Uropods 1—3, peduncle channelled above, rami equal, lanceolate, in uropod 1 rather shorter than peduncle, in uropod 2 a little longer, in uropod 3 much longer. Telson rather longer than broad, somewhat boat-shaped, broad distal margin convex. L. about 16 mm. Southern Indian Ocean (Heard Island). Depth 282 m. 25. Fam. Atylidae 1865 Subfam. Atylina (part.), W. Lilljeborg in: N. Acta Soc. Upsal., ser.3 ©.6 nr.1 p.18 | 1876 Subfam. Atylinae (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.320| 1882 Atylidae, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.26 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 899. Body strongly compressed, carinate. Pleon segments 5 and 6 coalesced. Antenna 1, accessory flagellum rudimentary or absent. Upper lip rounded. 328 Atylidae, Atylus Lower lip with inner lobes obsolescent. Mandible (Fig. 77 p. 333) with palp. Maxilla 1 (Fig.78 p.333), inner plate with several setae. Maxilla 2, inner plate partially fringed on inner margin. Maxillipeds, palp well developed. Gnatho- pods 1 and 2 subchelate, gnathopod 2 generally the more slender. Peraeo- pods 1—5, finger usually pointing backward. Uropod 3, rami subequal, extending beyond those of uropod 2. Telson short, deeply cleft. | Marine. 2 genera, 8 accepted species and 1 obseure. Synopsis of genera: Mandibular palp strong; pleon segment 4 not. dorsally Böbched ER NER En SER 1. Gen. Atylus . . . p.828 Mandibular palp slight (Fig. 77 p.333); pleon segment 4 Gorselir ADtchell; 25 2:5, a re 2. (sen. Nototropis . p. 329 1. Gen. Atylus Leach 1815 Atylus (Sp. un.: A. carinatus), Leach, Zool. Mise., v.2 p.21 | 1815 A., Leach in: Tr. Linn. Soc. London, v.11 p. 857 | 1888 A., T. Stebbing in: Rep. wog: Challenger. v.29 p. 907 | 1898 A., G. O. Sars, Crust. Norway, v.1p.471 | 1893 A. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 697. Body strongly compressed, carinate. Pleon segment 4 dorsally produced, but without antecedent notch. Side-plates not deep. Antennae 1 and 2 subequal, not very slender, accessory flagellum rudimentary. Mandible normal, palp large, 39 joint long and spinose. Maxilla 2, outer plate wider and longer than inner. Maxillipeds rather large, outer plates not reaching end of palp’s 24 joint, palp rather strong. Gmathopods 1 and 2 short but strong, with broad 6!" joint. Peraeopods 1—5 rather short, peraeopod 5 with 24 joint much dilated, finger reversed. Branchial vesicles simple. Uropod 3, rami long, nearly equal, not reaching beyond uropod 1. Telson deeply cleft. l speeies. l. A. carinatus (F.) 1793 Gammarus c., J. C. Fabrieius, Ent. syst., v.2 p.515 | 1815 Atylus e., Leach, Zool. Misc., v.2 p.22 t.69 | 1874 A. c., Buchholz in: Zweite D. Nordpolarf., v.2 p.357 Crust. t.10 | 1876 A.c., A. Boeck, Skand. Arkt. Amphip., v. 2 p. 324 | 1893 A. ce., G. ©. Sars, Crust. Norway, v.1 p.471t.166 f.1 | 1893 A. c., A. Della Valle in: F. Fl. Neapel, v.20 p.701 t.60 f.5 | 1838 Amphithoe carinata, Kröyer in: Danske Selsk. Afh., ©.7 p.256 t.2 f.6a—k | 1838 A. c., Kröyer in: Naturh. Tidsskr., v.2 p.259 | 1866 Paramphithoö c., Goes in: Ößr. Ak. Förh,, v.22 p.523. Body elongate, carinate throughout, the keel produced into a tooth in peraeon segment 7 and pleon segments 1—4. Head, rostrum rather large, compressed, distally somewhat expanded, ending obtusely; lateral corners subtruncate. Side-plates 1—4 almost quadrangular, 4% broader, scarcely deeper than the preceding, little emarginate, 5!" with front lobe the deeper. Pleon segment 3, postero-lateral corners subquadrate. Eyes very small, rounded oval, prominent, very dark. Antenna 1 not nearly !/;, as long as body, 1° joint as long as 24, 34 about half 24, flagellum scarcely longer than pedunele, 22-jointed, accessory flagellum 1-jointed, very small. Antenna 2 not (Boeck: a little) longer, ultimate and penultimate joints of peduncle sub- equal, together longer than the 20-jointed flagellum. Gnathopod 1, 5th joint not very long, but nearly as long as 6th, 6th rounded oval, front margin densely setose, palm shorter than hind margin, with which it forms an Atylus, Nototropis 329 obtuse angle, finger rather short and stout. Gmathopod 2 similar, rather longer. Peraeopod 1 longer than peraeopod 2, 4% joint in both rather stout.. Peraeopods 3 and 4, 24 joint not very wide, narrowing distally. Peraeopod 5, 24 joint broader than long, hind lobe produced, defined by a notch in front, finger short and stout as in peraeopods 3 and 4, in all 3 easily reversed. Uropod 2 much shorter than uropods 1 and 3, the outer ramus a little shorter (Boeck: a little longer) than the inner. Uropod 3, peduncle very short, rami long, fringed with slender setae. Telson oval triangular, small, longer than broad, cleft nearly to base, tapering to obtuse apices, each carrying a spinule. Colour whitish with red spots? L. 32—43 mm. Arctic Ocean (widely distributed; north of Norway, in stomach of Liparis montagui Donov.). 2. Gen. Nototropis A. Costa 1853 Nototropis, Notrotopis (Sp. un.: N. spinulicauda), A. Costa in: Rend. Soe. Borbon., n. ser. v.2 p.170, 173 | 1859 Paramphithoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.68 | 1861 Epidesura (Sp. typ.: Amphitho& compressa), A. Boeck in: Forh. Skand. Naturf., Mode 8 p.659 | 1893 Paratylus, G.O. Bars, Crust. Norway, v.1 p. 462. Body strongly ecompressed, carinate. Pleon segment 4 dorsally produced with antecedent notch. Head rostrate, lateral margins sinuous. Side-plates 1—4 of moderate size, generally smaller in JS than in ©, 5tt with front lobe the deeper. Antenna 1 the shorter, without accessory flagellum, both pairs elongate in d. Mandible (Fig. 77 p. 333) normal, palp slender, feebly armed. ‚Maxilla 1 see fig. 78 (p. 333), maxilla-2 as in Atylus. Maxillipeds, outer plates fully reaching or passing end of palp’s 24 joint, palp slender. Gnathopod 1 rather stouter and shorter than gnathopod 2, 6! joint oval, densely spinose in front; 5t" joint in both pairs elongate triangular, palm oblique. Peraeopod 1 longer than peraeopod 2, peraeopod 3 short, with 24 joint piriform, peraeo- pods 4 and 5 longer, subequal, 24 joint in peraeopad 5 widely expanded, finger in peraeopods 3—5 sometimes reversed. Branchial vesieles often pleated. Uropods 1 and 2, outer ramus the shorter. Uropod 3, rami sub- equal, lanceolate, spinulose. Telson short, deeply cleft, apices subtruncate. 7 species accepted, 1 obscure. Synopsis of accepted species: 1 | Peraeopod 1, finger very large... ... . 1. N.falcatus . .. . . p- 330 Peraeopod 1, finger not very large — 2. o H Pleon segments 1—3 without dorsal teeth. . 2. N. swammerdamei . p.330 Pleon segments 1—3 with dorsal teeth — 3. Peraeopod 5, 2d joint with lower hind corner triangularly produced — 4. Paraeopod 5, 24 joint with lower hind corner - not triangularly produced — 6. Branchial vesicles simple. . . ....... 8. N. vedlomensis . . . p.331 Branchial vesicles not simple — 5. | Eyes large, reniform; a spinulose hump on : | | 4 eomposite segment of pleon. . ..... 4. N. guttatus. . . . - p. 331 Eyes small, round; no spinulose hump on ceomposite segment of pleon . ..... 5. N. nordlandieus. . . p. 332 Post-antennal -corners not produced; uro- p6d 8, rami very long 2... ..... 8, smiti. ..... p. 332 Post-antennal corners produced; uropod 3, es 7. N.homochir . . . . p.333. 330 Nototropis 1. N. faleatus (Metzg.) 1871 Atylus f., Aug. Metzger in: JJahresber. Ges. Hannover, v.21 p.28 | 1889 A. f, Hoek in: Tijdschr. Nederl. dierk. Ver., ser. 2 o.2 p.195 t.8 f.2,21| 1893 A. f., A. Della Valle in: F. Fl. Neapel, v.20 p.703 | 1888 A. f., Tritaeta?, T. Stebbing in: Rep. Voy. Challenger, v.29 p.408 | 1882 A. uneinatus, G.O. Sars in: Forh. Selsk. Christian., nr. 18 p.101 t.5 f.3, 3a | 1893 & 95 Paratylus falcatus, P.u., 6. O. Sars, Crust. Norway, v.1 p.465 t. 164 f.1; p.697 | 1895 P.f. + P.u., A. 0. Walker in: P. Liverp. biol. Soe., v.9 p. 306. Resembles N. swammerdamei except in the following points. Pleon segments 1—3 produced (not so in Alylus uneinatus O. Sars) to a small dorsal tooth. Side-plate 1 tapering distally, 4% little broader than 39. Antennalino scarcely '/, as long as body, flagellum little longer than peduncle. Antenna 2 much longer, ultimate joint of pedunele not nearly twice as long as pen- ultimate, flagellum not as long as both combined. Gnathopod 1 less strongly built. Gnathopod 2, 6tk joint narrowly oblong, palm very oblique, subequal to hind margin. Peraeopod 1 strong, 5t joint very short, cup-shaped, 6! eurved, with strong spines at base, finger huge, falciform, fitted for elasping. Peraeo- pod 2 very small, 5th—7th joints almost rudimentary. Peraeopods 3—5, 5th ‚joint much longer than 6%, finger reversed, 24 joint in peraeopod 5 broader and with more convex hind margin than in the other species. Colour rather pellueid, with scattered brownish patches (Sars) or white with a red spot on the back of each segment except pleon segment 4 (Walker). L. 9 5—7 mm. Arctie Ocean, North-Atlantic and North-Sea (Norway, East Frisian coast, Holland, France, North-West England, Wales). 2. N. swammerdamei (M.-E.) 1830 Amphithoe s., H. Milne Edwards in: Ann. Sei. nat., v.20 p.378 | 1840 Amphitoe svammerdamii, H. Milne Edwards, Hist. nat. Crust., v.3 p.35 | 1876 Atylus s., A. schwammerdamüi, A. Boeck, Skand. Arkt. Amphip., ®.2 p.328 t.21 f.5; 1.22 £.1 | 1879 A. swammerdammii, Hoek in: Tijdschr. Nederl. dierk. Ver., v.4 p. 134, 152 t.10 £. 1—6 | 1893 A. swammerdamiäi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.698 t.3 £.12; t.17 f.1-—-21 | 1893 Paratylus swammerdami, &. O. Sars, Crust. Norway, v.1 p. 463 “ 163 | 1895 P. swammerdamii, A. O. Walker in: P. Liverp. biol. Soc., v.9 p.805 | 1852 Amphitho& compre8sa, W. Liljeborg in: Öfv. Ak. Förh., v.9 p.8 | 1859 Paramphithoe e., R. M. Bruzelius in: Svenska Ak. Handl., n. ser, v.3 nr.1 p.72 | 1861 Amphithoe c., Epidesura sp. typ., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.659 | 1857 Dexamine gordoniana, Bate in: Ann. nat. Hist., ser. 2 v.19 p.142 | 1862 D. loughrini + Atylus swammerdamit + A. compressus, Bate, Cat. Amphip. Brit. Mus., p.182 t.24 f.3; p.136 t.26 f.2; p. 142. None of the segments produced to a dorsal tooth except 4 of pleon, the following composite segment ending in a little spinulose hump. Head, rostrum rather short, lateral margin bilobate, lobes rounded, post-antennal corners not produced. Side-plates I—4 much larger and deeper in O than in d, 1° not tapering, 4 slightly emarginate, front lobe of 5t" rounded. Pleon segment 3, postero-lateral eorners quadrate, with small acutely produced point. Eyes oblong reniform, larger in C than in ©, dark brown with whitish coating. Antenna 1 in Q more than '/, length of body, 1° joint as long as 24 and 3% combined, flagellum not quite twice as long as peduncle, about 24-jointed. Antenna 2 in © little longer, ultimate joint of peduncle nearly twice as long as penultimate, flagellum about equal to both combined. Antennae 1 and 2 in G much longer, with fascieles of setules on confronting edges of peduncles. Gnathopod 1, 5t" joint shorter than the 6‘%, which is rather stout, ovate, front margin with many series of spinules; palm very oblique, not strongly defined. Gnathopod 2 longer, more slender, 5!" joint nearly as long as 6%", which is narrow, with short, moderately Nototropis 331 definite palm. Peraeopods 1—5, 5tt joint shorter than 6th, finger small. Peraeopods 3-5, 24 joint with subacutely produced lower hind corner (production very slight in peraeopod 4), finger reversed; in peraeopods 3 and 4 front margin of 24 joint setose, in peraeopod 5 24 joint broadly oval. Uropod 3, rami more than twice as long as peduncle. Telson rather longer than broad, cleft nearly to base, apices truncate, each with a spinule. Colour pellueid, whitish, with small patches of chestnut-brown. L. 08mm, d rather less (Sars), adult S and © 4—9'5 mm (Walker). Aretie Ocean, North-Atlantie and Mediterranean (Europe from Vadsö [Finmark] round to Naples, also at the Azores). From between tide-marks to 37 m. 3. N. vedlomensis (Bate & Westw.) 1862 Dexamine v., Bate & Westwood, Brit. sess. Crust., v.1 p.242 f. | 1871 Atylus v., A. Boeck in: Forh. Selsk. Christian., 1870 p.192 | 1876 A. v., A. Boeck, Skand. Arkt. Amphip., v.2 p.330 t.9 £.9; t.11 £.6 | 1893 Paratylus v., 6. O. Sars, Crust. Norway, v.1 p.466 t.164 f.2 | 1866 Atylus costae, Cam. Heller in: Denk. Ak. Wien., v.2611 p.31 | 1893 Dexamine spinosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 579. Body slender, very distinetly carinate, peraeon segment 7 and pleon segments 1—3, as well as the 4", produced to compressed acute dorsal teeth, the following composite segment being apparently smooth, though with slight dorsal depression. Head, rostrum rather prominent, lateral margin bilobate, upper lobe acute, lower rounded, post-antennal corners not produced. Side-plates 1 and 2 slightly tapering, 34 and 4!" broader, not very unequal. Pleon segment 3, postero-lateral cormers rotundo-quadrate with obsolete point. Eyes small, oval, dark. brown with whitish coating (Sars; perhaps only applying to ©). Antenna 1 in Q much more than /, as long as body, 1° joint thiecker than 24, scarcely as long, produced to a denticle varying from obtuse to acute, 34 joint rather small, flagellum rather longer than pedunele, about 28-jointed. Antenna 2 in Q longer, ultimate joint of peduncle longer than penultimate, flagellum about as long as peduncle. In S antennae 1 and 2 attain greater length, 24 joint of peduncle of antenna 1 and ultimate joint of peduncle of antenna 2 being more elongate than in O. (nathopods 1 and 2, peraeopods 1 and 2, uropods 1—3 and telson nearly as in N. swammerdamei, but gnathopods 1 and 2 rather more slender. Peraeo- pods 3—5, 5th joint much longer than 6%, finger recurved. Peraeopod 3, 24 joint in Q uncinately produced at lower hind apex. Peraeopod 5, 24 joint very broad, lower hind corner rather sharply produced. Branchial vesicles not pleated. Colour semipellueid, yellowish, with a row of rounded orange spots along the back; sides, antennae, legs streaked and mottled with orange, mouth-parts and uropods tinged with dark brown; ova in pouch bluish-green. L. 9 8 mm. North-Atlantie, North-Sea and Skagerrak (South--and West-Norway, depth 19—94 m; Shetland Islands and southward to France); Kattegat. 4. N. guttatus (A. Costa) 1851 Acanthonotus g., Amphithonotus? g., (A. Costa in:) F.W.Hope, Cat. Crost. Ital., p.46 | 1857 Nototropis g., A. Costa in: Mem. Acc. Napoli, v.1 p.194 t.1 £.7 | 1885 Amphitonotus g., J. V. Carus, Prodr. F. Medit., v.1 p.408 | 21853 Notrotopis spinulicauda, A. Costa in: Rend. Soe. Borbon., n. ser. e.2 p.173 | ?1857 Nototropis s., A. Costa in: Mem. Ace. Napoli, v.1 p.194 t.1 f.8 | 1893 Dexamine spinosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.573 | ?1895 Atylus andrusowi, Sowinski in: M&m. Soe. Kiew, ©. 14 t.4 f. 7—14. In general appearance strikingly in agreement with N. vedlomensis, but clearly distinet. The composite pleon segment ends in a well marked en NT EEE a ee a BE ER Ds a y en er 332 Nototropis little spinulose hump. Rostrum rather long, with rounded end. Eyes reni- form, of moderate size in Q, very large in S, almost meeting at the top of the head. In peraeopod 3 the lower hind corner much less distinctly uneinate than in N. vedlomensis (p. 331); in peraeopod 5 the 24 joint not very broad, with the produced point not acute. Branchial vesicles of peraeo- pod 5 and to some extent those of peraeopod 4 simple, but those of gnathopod 2 and peraeopods 1—3 remarkably developed; their numerous distinet lobes approaching to the phyllobranchiate structure. Colour reddish white or yellowish, with 3 longitudinal series of milky. white spots on each side, and with various little broken snuff-coloured lines. L. about 10 mm. Mediterranean; Bay of Biscay (Vicero [North of Spain]); Black Sea? 5. N. nordlandicus (Boeck) 1871 Atylus n., A. Boeck in: Forh. Selsk. Christian., 1870 p.193 | 1876 A.n., A. Boeck, Skand. Arkt. Amphip., v.2 p.332 t.23 f.2 | 1893 Paratylus n., &. O. Sars, Crust. Norway, ©.1 p.469 t.165 f.2 | 1893 Atylus suammer- damii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 698. Body as in N. vedlomensis (p.331), but with peraeon segment 6 also toothed; head also similar, but rostrum more prolonged, reaching beyond middle of 1% joint of antenna 1, nearly horizontal. Side-plates 1—4 rather deep, 1% and 24 rather narrow, distal margin serrate and setose, 34 and 4% distally rounded, serrate, 4!" not emarginate, 5!" with front lobe narrowly rounded. Pleon segment 3, postero-lateral corners subquadrate, with small produced point and margin above slightly crenulate. Eyes very small, rounded, red. Antenna 1 in © about "/, as long as body, 1% joint a little shorter than 24, flagellum little longer than peduncle, 12-jointed. Antenna 2 rather longer, ultimate joint of peduncle little longer than penultimate, flagellum as long as both combined. Gmathopod 1, 5t" and 6" joints equal, 6!" oblong oval, palm ill-defined. Gnathopod 2 much longer, 6% joint shorter than elongate 5th, slightly widened distally. Peraeopods 1 and 2, 4% joint as long as 5th and 6 combined, 5% much shorter than 6%, Peraeopod 3, 24 joint with lower hind angle acutely produced, 5t% rather longer than 4 or 6%, Peraeopod 5, 24 joint very wide, lower hind angle acutely produced. Branchial vesicles pleated. Uropod 3, rami nearly 3 times as long as peduncle. Telson longer than broad, eleft °/, length, slightly dehiscent, apices obliquely truncate, armed with spinules and 2 setules. Colour dark yellowish grey, with row of obseure orange spots. L._Q scarcely 8 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway northward to Hasvig [West Finmark]). Depth 94—188 m. 6. N. smitti (Goös) 1866 Paramphitho& s., Goes in: Öfv. Ak. Förh., v.22 p.524 t.38 f.14 | 1871 Atylus s., A. Boeck in: Forh. Selsk. Christian., 1870 p.190 | 1876 A.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.326 | 1887 A. smittii, H. J. Hansen in: Dijmphna Udb., p.223 | 1894 A. smitti, T. Stebbing in: Bijdr. Dierk., v.17 p.35 | 1893 Para- tylus s., P. smithi, G. O. Sars, Crust. Norway, v.1 p.468; t.165 f.1 | 1898 Atylus swammerdamii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 698. Body highly compressed, very distinetly carinate, peraeon segments 5—7 and pleon segments 1—4 produced to compressed teeth, the size at first small but encreasing successively to that on segment 4, which is preceded by the usual notch. Head, rostrum sometimes reaching end of 1° joint of antenna 1, lateral margin sinuous, forming below a deflexed lobe defined - by a notch, post-antennal corners not produeed. Side-plate 1 narrow, bent forward, distally a little widened and serrate, 24 narrow, 3% and 4b Ba en le a Bu nd En ae ae ah a rl, en Nototropis 383 broader, less deep, distal border slightly emarginate, 5t" with front lobe subacute. Pleon segment 3, postero-lateral corners rotundo-quadrate with minutely produced point. Eyes small, rounded, carmine. Antenna 1 very slender, nearly '/, as long as body, 1°* joint much shorter than 24, 34 very small, flagellum about twice as long as pedunele, with about 45 joints. Antenna 2 little longer, ultimate and penultimate joints of peduncle subequal, flagellum about as long as peduncle, with 50 short joints. Gnathopods 1 and 2 very slender, 5tk joint longer, little narrower than 6%, both densely getose, palm rather oblique, shorter than hind margin. Gnathopod 2 longer and more slender than gnathopod 1. Peraeopods 1 and 2, 4 joint scarcely as long as 5t" and 6!" combined, 5t" much shorter than 6th. Peraeo- pods 3—5 rather long, 5% joint much longer than 6*h, finger scarcely reversed, 24 joint in peraeopod 3 with lower hind corner acute but scarcely produced, 24 joint in peraeopod 5 very wide, and distally abruptly narrowed, scarcely forming a lobe and not ending acutely. Branchial vesicles not pleated. Uropod 3, rami extending much or little beyond uropods 1 and 2, 4 or 5 times as long as pedunele, densely spinose. Telson scarcely longer than broad, eleft nearly to the base (Boeck: much longer than broad; cleft not so far extending), apiees not dehiscent, transversely truncate, each with a spinule, L. © 23—35 mm. Aretie Ocean (Finmark, Greenland, Spitzbergen, Siberia). 7. N. homochir (Hasw.) 1885 Atylus h.; Haswell in: P. Linn. Soe. N.S. Wales, v.10 p.101 t.13 £. 5—7 (juy.) | 1888 A. h., T. Stebbing in: Rep. Voy. Challenger, 2.29 9.908 1.74 | 1893 A. svammerdamii (part.). A. DellaValle in: F. Fl. Neapel, v.20 p.698. Body highly compressed, very distinetly carinate, peraeon segment 7 and pleon segments 1—3 produced to minute teeth, the hinder tooth on segments 4 and 6 more pronounced, the 4" with the usual notch, the coalesced 5 and 6! with a small anterior tooth. Head, rostrum slender, acute, reaching middle of 1° joint of antenna 1, lateral margins forming inner _ plate Fig. 77. N. homochir. Fig. 78. N. homochir. Mandible. ; Maxilla ı. below a deflexed lobe, post-antennal eorners acutely produced. Side-plate 1 narrow, bent forward, spiniferous, 24— 4! successively wider, also erenulate and spiniferous, 4" with lower border a little emarginate, 5tk with narrowly produced front lobe. Pleon segments 1—3, postero-lateral eorners produced to a small acute point, margin above convex. Eyes oval reniform. Antennae 1 and 2 elongate, peduncle carinate. Antenna 1, 1% joint distally produced into a short tooth, 24 joint rather longer, 39 about !/, length of 24, with a little tuberele looking like rudiment of accessory flagellum, flagellum considerably longer than pedunele, 40-jointed. Antenna 2 rather longer, ultimate joint 334 Nototropis, Melphidippidae of pedunele longer than penultimate, both long, spinose, flagellum slender, rather longer than ultimate joint of pedunele, 35-jointed. Mandible (Fig. 77), 34 joint of slender palp rather longer than 24, Maxilla 1 (Fig. 78), inner plate with 6 setae, outer with 11 spines, 24 joint of palp with slender spines on apex of one maxilla and stouter spines on the other, characters which probably apply to all the species, but have not been definitely recorded for all. Maxillipeds, outer plates reaching end of 24 joint of slender palp. Gnathopod 1, 5t" joint slightly shorter and narrower than 6th, Gt narrowly oval, widening a little distally, palm oblique, moderately defined. Gmnatho- pod 2, 5tk and 6th joints subequal, longer and less spinose than in gnathopod 1. Peraeopods 1 and 2 attached as in N. smitti (p. 332) very low down on the side- plates, 4! joint as long as 5! and 6tk combined, 5tk very short, shorter than the finger. Peraeopod 3, 24 joint piriform, lower hind corner not produced, 4 longer than 5th, 5th than 6, Peraeopod 5, 24 joint very broad, scarcely forming a lobe below, not produced, 5!" joint as in peraeo- pod 4 longer than 4 or 6t, finger reversed. Branchial vesicles simple. Uropod 3, rami about thrice as long as peduncle, not reaching beyond uropod 1. Telson short, not longer than peduncle of uropod 3, rather longer than broad, cleft °/, length, apices subtruncate, each with a spinule. L: 14 mm. Port Stephens [East-Australia], Port Phillip [southern Australia. Depth 62 m. N. villosus (Bate) 1862 Aiylus v., Bate, Cat. Amphip. Brit. Mus., p. 135 t. 26 f.1 | 1893 A. smammerdamii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 698. L. 23 mm. South-Atlantie (Hermit Island, lat. 56° S.). 26. Fam. Melphidippidae 1899 Melphidippidae, T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210 | 1899 M., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 422. Some of the segments dentate, body extremely slender. Head without distinet rostrum. Side-plates very shallow, 4 not emarginate, 5" with front lobe the deeper. Antenna 1 slender, with accessory flagellum. Antenna 2 not longer than antenna 1. Upper lip rounded, with,slight emargination. Lower lip with inner lobes well developed. Mandible with slender palp; maxilla 1, inner plate with many setae; maxilla 2, inner plate fringed on inner margin; maxillipeds, outer plates with spine-teeth on inner margin. Gnathopods 1 and 2 weakly subchelate, 5th joint rather elongate. Peraeo- pods 1—5 long and slender. Peraeopods 3—5, 24 joint little expanded. Branchial vesicles simple. Marsupial plates narrow. Uropods 1 and 2, outer ramus the shorter. Uropod 3 very elongate. Telson cleft. Marine. 2 genera, 5 species. Synopsis of the genera: Eyes imperfeetly developed; antenna 1, accessory flagellum well developed. . . 2... ... 1. Gen. Melphidippa . . . p.335 Eyes strongly developed; antenna 1, accessory flagellum diminutive . . ». ». . » 2 2 2 2.2. 2. Gen. Melphidippella . . p. 357 Melphidippa 335 1. Gen. Melphidippa Boeck 1871 Melphidippa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.218 | 1876 M., A. Boeck, Skand. Arkt. Amphip., v.2 p.413 | 1894 M., G. O. Sars, Crust. Norway, v.l p.482. Side-plate 1 triangularly produced, lower margin fringed with setules. Eyes imperfectly developed. Antenna 1, peduncle rather long, accessory flagellum well developed. Antenna 2 with peduncle long and densely setose. Mandible, 34 joint of palp little‘ shorter than 24. Maxillipeds, palp elongate.. Gnathopod 1, 5th joint expanded proximally. Peraeopods 1 and 2 setose, finger long, with setae on both margins. Peraeopods 3—5, finger small, in peraeopods 4 and 5 reversed. Uropod 3, peduncle elongate, narrow, rami subequal, linear, spinose. Telson triangular, longer than broad, apices. bidentate. 4 species. Synopsis of species: 1 j Palm of gnathopod 2 excavate and rather long . . 4. M. serrata . . p.337 \ Palm of gnathopod 2 not excavate, short — 2. PR] BaRaae 3, OR Jam BE 2. en seen, 1. M.goösi . . . p.335- 2, Antenna 1, 3d joint long — 3. ‘‘ Antenna 1, 2d joint much longer than 15t; gnatho- - 3 | pod 2, 5th joint much longer than 6th. .. .. 2. M. macrura. . p. 336: | Antenna 1, 2d joint not much longer than 1st; gnatho- pod 2, 5th joint not longer than 6th. ..... 3. M. borealis.. . p. 336 1. M. godsi Stebb. 1866 Gammarus spinosus (non Cancer (@.) s., Montagu 1813), Goös in: Öfv. Ak. Förh., 0.22 p.530 t.40 f.30 | 1871 Melphidippa spinosa, A. Boeck in: Forh. Selsk. Chicken 1870 p.219 | 1876 M.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.417 t.23 f.4 | 1894 M. s., G. O. Sars, Crust. Norway, v.1 p.483 t.169 | 1893 Ceradocus spinosus, A. Della Valle in: F. Fl. Neapel, v.20 p. 719 | 1899 Melphidippa. go@si, T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p. 422. Pleon segments 1—3 each produced into 3 sharp dorsal teeth, with. small denticles between them, segments 4 and 5 each produced into a large simple tooth. Head, lateral corners obtusely truncate. Pleon segments 1—3, postero-lateral margins irregularly dentate, in segment 3 postero-lateral corners acutely produced. Eyes oval, narrowed above, red with whitish‘ coating. Antenna 1 long, 24 joint much longer than 1°, 34 scarcely '/, as long as 24, flagellum nearly thrice as long as peduncle, 24-jointed; accessory flagellum not very large, 2-jointed. Antenna 2 rather shorter, ultimate joint of pedunele shorter than penultimate, flagellum about half length of peduncle. Gnathopod 1, 5th joint broad, laminar, densely setose at base, narrowed distally, 6 much shorter, subfusiform, setose, palm ill-defined, finger slender, curved. Gnathopod 2 much more slender, 5t" and 6tk joints narrow, subequal, palm very short, finger extremely small. Peraeopods l.and 2, 5tk joint longer than 4! or 6, Peraeopod 3, 24 joint acutely produced at lower hind angle. Peraeopods 3—5, 4tk and 5tk joints subequal, 6% much shorter. Uropod 2, outer ramus about half length of inner, longer than peduncle. Uropod 3, inner ramus rather the longer, nearly as long as the elongate pedunele. Telson nearly twice as long as broad, with a row of spinules along each margin, cleft nearly to middle, with a pair of plumose (auditory) setae near top of cleft, a long spine in each apical notch, of which the 336 Melphidippa outer tooth is the longer. Colour whitish, varied with reddish brown. L. © 9 mm. Aretie Ocean, North-Atlantie and North Sea (Spitzbergen, Kara Sea, Norway, Seotland). Depth 9—94 m. \ 2. M. macrura O.Sars 1894 M. m., G.O.Sars, Crust. Norway, v.1l p.484 4.170 £.1. Pleon segments 1—3 each produced to a dorsal tooth, with the hind margin on either side of it finely denticulate, segments 4 and 5 each produced to a long somewhat curved tooth. Head, lateral corners narrowly rounded. Pleon segments 1—3, postero-lateral margins smooth, except in segment 3, which has the postero-lateral corners produced to a small tooth. Eyes about as in M. goösi (p. 335). Antenna 1, 24 joint nearly twice as long as 1°t, 34 nearly ?/, length of 24, flagellum little longer than peduncle, about 15-jointed, accessory flagellum rather long, 4-jointed. Antenna 2 searcely shorter, ultimate joint of peduncle rather longer than penultimate, and longer than flagellum. Gmathopod 1, 5% joint less expanded than in M. goösi. Gnathopod 2, 5th joint expanded in an oblong form between the narrow extremities, 6% much smaller, subfusiform as in gnathopod 1, finger rather elongate. Peraeopods 1 and 2, 5tk joint subequal to 6th, and scarcely longer (shorter in figure) than the 4, Peraeopods 3-—-5 as in M. goösi, .except that the 24 joint of peraeopod 3 is not produced. Uropods 1—3 nearly as in M. goösi, except that uropod 3 is still more elongate, with the peduncle considerably longer than the rami. Telson with a single pair of lateral spinules close to the base, 2 pairs of setae near top of cleft, which extends beyond the middle, inner tooth of each bidentate apex very short, the spine in the noteh not elongate. L. © 8 mm. North-Atlantie (West-Norway). 3. M. borealis Boeck 1871 M.b., A. Boeck in: Forh. Selsk. Christian., 1870 p. 219 | 1876 M. b., A. Boeck, Skand. Arkt. Amphip., v.2 p.415 t.23 f.3 | 1894 M. b., G. ©. Sars, Crust. Norway, v.1 p.486 t.170 f.2 | 1893 Ceradocus b., A. Della Valle in: F. Fl. Neapel, v.20 p. 720. Pleon segments 1—5 each produced into a small dorsal tooth, with dentieulation of the hind margin on either side of it in segments 2—5. Head, lateral corners broadiy rounded. Pleon segments 1—3, postero- lateral margins smooth, postero-lateral corners of segment 3 quadrate. Eyes rather small, rounded, red with whitish coating. Antenna 1, 24 joint longer than 1°, 34 about half as long as 24, flagellum twice as long as peduncle, 19-jointed, accessory flagellum longer than 34 joint of pedunele, 5-jointed. Antenna 2. scarcely shorter, ultimate and penultimate joints of pedunele subequal, flagellum half as long as pedunele, 4-jointed. Gnathopod 1 about as in the preceding species. Gnathopod 2, 5" joint a little expanded, 6% fully as long as 5th, long oval, palm very short, finger small. Peraeopods 1 and 2, 5th joint nearly as long as 4, longer than 6%, Peraeopods 3—5 as in M. macrura. Uropods 1—3 as in M. goösi (p. 335). Telson very narrow, nearly thrice as long as broad, eleft beyond middle, lateral margins smooth, a small spine in each apical notch. Colour whitish, broadly banded across with chestnut brown patches; ova in pouch dark bluish. L. © 7 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway from Christiania- fjord to Vadsö). Depth 54—188 m. Melphidippa, Melphidippella 337 4. M. serrata (Stebb.) 1888 Neohela s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1215 t.136 | 1893 N. s., A. Della Valle in: F. Fl. Neapel, v.20 p.343 | 1894 Melphidippa s., (T. Stebbing in:) G. O. Sars, Crust. Norway, v.1 p.624 | 1899 M. s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 422. Pleon segments 1—5 agreeing with those of M. borealis, but the 1° also dorsally denticulate and the 3% with postero-lateral corners produced ' into an acute tooth. Head with rostrum produced beyond tlıe narrow lateral corners. In general agreeing with M. borealis, but gnathopod 2 with 6% joint not quite so long as 5t%, and having a rather long, oblique, well excavate palm, and the finger not very small, the telson deeply cleft, with somewhat divergent lobes. Peraeopods 3—5, uropods 1—3, much of antennae 1 and 2 and apices of telson missing. Triturating organs of stomach seemingly devoid of strong spines. L. 8 mm. Cumberland Bay [Kerguelen Island]. Depth 239 m. 2. Gen. Melphidippella 0. Sars 1871 Melphidippa (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.218 | 1894 Melphidippella (Sp. un.: M. macera), G. O. Sars, Crust. Norway, v.1 p. 487. Side-plate 1 subquadrate. Eyes well developed. Antenna 1, peduncle not very long, accessory flagellum rudimentary. Antenna 2 shorter than antenna 1 in Q, but not in d. Mandible, 3% joint. of palp much shorter than 24, Maxillipeds, palp not elongate. Gnathopod 1, 5" joint scarcely expanded proximally. Peraeopods 1 and 2 extremely slender, finger very short. Peraeopods 3—5, finger reverted. Uropod 3, pedunecle elongate, sublaminar, rami subequal, narrowly lanceolate. Telson triangular, longer than broad, apices bidentate. 1 species. 1. M. macra (Norm.) 1869 Atylus macer, A. M. Norman in: Rep. Brit. Ass., Meet. 38 p. 280 | 1888 A.? m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1628 | 1889 Melphidippa macra, A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p. 121 t.10 £.14; t.12 f.4—7 | 1893 Ceradocus macer, A. Della Valle in: F. Fl. Neapel, v.20 p.720 | 1894 Melphidippella macera, G. O. Sars, Crust. Norway, v.1 p.488 t.171 | 1871 Melphidippa ‚longipes, A. Boeck in: Forh. Selsk. Christian., 1870 p.219 | 1876 M.I., A. Boeck, Skand. Arkt. Amphip., v.2 p.414 t. 24 £.5. Peraeon in Q rather tumid. Pleon segments 1—5 each produced dorsally to a tooth, with the hind margin on either side of it finely denti- eulate.e Head short, but broad and deep, rostrum small, lateral lobes swollen and produced to an acute deflexed point. Side-plate 1, lower front corner minutely produced, 24 obliquely truncate belew, 5!" in front as deep as 4. Pleon segment 3, postero-lateral corners acutely produced, postero- lateral margin minutely serrate. Eyes large, semi-globose, red, on lateral lobes ofhead. Antenna 1 long, 1% joint thick, subequal to 2% and 34 combined, 34 very small, flagellum more than 4 times as long as peduncle, slender, with about 22 joints, accessory flagellum a minute setulose nodule. Antenna 2, penultimate joint of pedunele longer than ultimate, in S somewhat laminar, flagellum in 9 shorter than peduncle, with about 7 joints, in S fully as long as pedunele, with about 12 joints. Gnathopod 1, 5t% joint rather compressed, densely setose on hind margin, narrowing distally, 6{% much shorter, narrowly fusiform, finger slender. Gnathopod 2 rather longer, 5% joint Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 22 838 Melphidippella, Eusiridae, Eusirus rather narrow, in length subequal to the sublinear 6tt, which has a very short palm and finger to match. Peraeopods 1 and 2, 4th, 5th and 6th joints subequal. Peraeopods 3—5 longer and somewhat stronger. Uropod 3, rami a little longer than peduncle. Telson cleft much beyond the middle, slender spinules along lateral margins, a long spine in each apical noteh. Colour brick-red, mottled with opaque white. L. 6 mm. North-Atlantie, North-Sea and Skagerrak (Norway, Shetland Isles); Kattegat. Depth 11—54 m. 97. Fam. Eusiridae 1888 Eusiridae, T. Stebbing in: Rep. Voy. Challenger, v.29 p.953 | 1898 E., G. O. Sars, Crust. Norway, v.1 p.414. Pleon strongly developed. Head, margins incised for base of antenna 2. Side-plate 1 usually distally expanded (Fig. 79 p. 341). Antennae 1 and 2 (Fig. 82 p. 347), pedunele long; antenna 1 usually with small accessory flagellum. Upper lip not bilobed. Lower lip with small inner lobes. Mandible, molar generally well developed, 3% joint of palp elongate. Maxillae 1 and - 2 and maxillipeds normal; maxillipeds with strong palp. Gnathopods 1 and 2 (Fig. 80 p. 344) subequal, with large subchelate hands. Peraeopods 1 and 2 slender, shorter than the hinder peraeopods. Uropod 3 usually with subequal rami (Fig. 81 p. 344). Telson large, partly cleft. Marine. 6 genera, 26 accepted species and 1 obscure. Synopsis of genera: Gnathopods 1 and 2, 6th joint attached to produced apex of 5th — 2. Gnathopods 1 and 2, 6th joint with normal attachment to 5öth — 3, Gnathopods 1 and 2 (Fig. 79), 5th joint with 9 hind lobe prominent . » .. » 2.2... 1. Gen. Eusirus ... . . p. 838 | Gnathopods 1 and 2, 5th joint with hind lobe not. prominöhE +. 3: Er ai en 2. Gen. Eusiropsis. . . p.848 5 TERIRIDRRE BOB nn are 3. Gen. Eusiroides. . . p.345 \ Peraeopods (Fig. 83 p. 347) slender — 4. 4 a a RE ee 4. Gen. Cleonardo.. . . p.346 Body spiny and carinate — 5. P { En ee oe Br EN 5. Gen. Rhachotropis . p.347 TOR ON I ae 6. Gen. Rozinante . . . p.354 1. Gen. Eusirus Kroyer 1845 Eusirus (Sp. un.: EZ. cuspidatus), Kreyer in: Naturh. Tidsskr., ser.2 v.1 p. 501, 511 | 1861 E. A. Boeck in: Forh. Skand. Naturf., Mede 8 p.655 | 1888 E., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 964 | 1893 E., A. Della Valle in: F. Fl. Neapel, v.20 p.669 | 1898 E., G. O. Sars, Crust. Norway, v.1 p.415 | 1873 Eusinus, A. Marschall, Nomenel. zool., p. 409. Body compressed, more or less carinate, with dorsal projeetions. Head, rostrum small, lateral corners short, broad. Side-plate 4 the largest, emarginate behind. Pleon segment 3, postero-lateral angles not produced, lateral margin se i > Ei : % - er Eusirus 339 serrate. Eyes distinctt. Antenna 1,34 joint short, more or less covered by 2 dentate lobes of 24 joint, accessory flagellum a small linear joint with minute 24. Upper lip rounded. Mandible, cutting edge almost undivided, accessory plate dentate, spines of spine-row small, 3% joint of palp as long as 1° and 24 combined. Maxilla 1, inner plate with 1 or 2 setae, outer at least sometimes with 11 spines, palp not widened distally. Maxilla 2, both plates short, broad, apically rounded, inner the broader. Maxillipeds, inner plates sometimes partly coalesced, outer of moderate size, fringed with setiform spines, palp robust, finger unguiform. Gnathopods 1 and 2 (Fig. 79), 5th joint prolonged in front, behind produced to a narrow setose lobe, 6! very large, subquadrate or transversely elliptical, attached to the 5" joint only by its proximal front corner, palm nearly transverse, defined by a tooth and palmar spines, its edge sharp, minutely setose, finger long, slender, eurved. Peraeopods 1 and 2 generally very slender. Peraeopods 3—5 long, 24 joint oblong oval or piriform. Uropod 3, rami lanceolate, spinulose. Telson elongate, tapering, eleft or notched. 8 species. Synopsis of species: 1 Telson eleft beyond one third of length — 2. Telson not cleft beyond one third of length — 4. Peraeopods 1 and 2, 4th joint not nearly twice Be Eee en ae 4 1. E. cuspidatus . . p.339 Peraeopods 1 and 2, 4th joint twice as long as 5th — 8, 3 ı Antenna 1, 1st joint much longer than 24 . . . 2. E. propinquus . . p.340 Antenna 1, 1st joint not much longer than 24 . 3. E. antarcticus . . p.340 | Only 2 segments are dorsally produced into a tooth 4. E.longipes . . . p.341 3 segments are dorsally produced into a tooth — 5. f Pleon segment 3 dorsally dentate -- 6. | Pleon segment 3 not dorsally dentate — 7. 6 H Telson eleft nearly one third of the length. . . 5. E,leptocarpus . . p.341 Telson with minute apical notch. .. . .. » . 6. E. biseayensis . . p. 342 | Peraeopods 3—5, 6th joint not twiee as long as 24 7. E. minutus . . . p.342 Peraeopods 3—5, 6th joint nearly thrice aslong as2d 8. E.holmii . . . . p.342 1. E. euspidatus Kroyer 1845 E.c., Kreyer in: Naturh. Tidsskr., ser.2 vl p-501 t.7 f.1 | 1874 E.c., Buchholz in: Zweite D. Nordpolarf., v.2 p.313 Crust. t.3 f.2,2b | 1893 E. c., G. ©. Sars, Crust. Norway, v.] p.416 t,146 | 1893 E. c. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.669 t.18 f.41—50; t.59 f. 79—82. Body rather robust, carina produced to acute dorsal tootb in peraeon segments 6 and 7 and pleon segments 1 and 2; pleon segment 4 partly carinate. Head, rostrum short, obtuse, lateral corners slightly bilobed. Side-plate 1 moderately expanded distally, front corner rounded, hinder serrate with 3 denticles, as in the rather tapering 24 and 34, Pleon segment 3, postero- lateral corners evenly rounded, eonvex lateral margin minutely serrate. Eyes rather large, oval reniform, red. Antenna 1, 1% and 24 joints subequal, with dentate apical lobes, flagellum about twice as long as peduncle, with about 50 short joints, accessory flagellum very small, scarcely as long as 34 joint of pedunele. Antenna 2 considerably shorter, ultimate and penultimate joints of peduncle subequal, together fully as long as flagellum. Gnathopods 1 and 2 rather robust, lobe of 5% joint prominent, 6!" not much broader than long, 22* 340 Eusirus rounded quadrangular, palm little arched, finger powerful. Peraeopods 1— 5 more robust than in other species, very spinulose. Peraeopods 1 and 2, 4 joint not much longer than 5t". Peraeopod 5, 24 joint not nearly twice as long as broad, in length subequal to 6% joint. Uropod 3, inner ramus rather longer than outer. Telson large, slightly tapering, cleft nearly to centre, fissure not dehiseent till near to the acute divergent apices. Colour uni- formly yellowish, or whitish yellow passing over to the colour of the face. L. reaching 39 mm. North-Atlantie and Arctic Ocean (Greenland, Spitzbergen, Finmark). Depth 38—113 m. 2. E. propinguus 0. Sars 1893 E. propingvus, G. O. Sars, Crust. Norway, v.1 p.417 £.147 £.1. z Body moderately slender, not strongly carinate, peraeon scarcely carinate till segment 7, which has the dorsal tooth almost obsolete, only pleon segments 1 and 2 produced into a prominent dorsal tooth. Head, rostrum small, lateral corners nearly transversely truncate. Side-plate 1 well expanded distally, front corner rounded, hinder with 1 denticle. Pleon segment 3, postero-lateral corners narrowly rounded, lateral margin finely serrate. Eyes large, oval reniform, light red. Antenna 1 in 9, 1° joint fully as long as 24 and 34 combined, with dentiform apical lobe, flagellum scarcely as long as peduncle, 34 joint of.peduncle and the flagellum calceoliferous on lower margin, accessory flagellum linear, longer than 34 joint of peduncle. Antenna 2 little shorter, ultimate joint of peduncle rather shorter than penultimate, both with flagellum calceoliferous on upper margin, flagellum about half as long as pedunele. Gnathopods 1 and 2 less robust than in E. cuspidatus (p. 339), lobe of 5tk joint very narrow, 6!" nearly elliptical, much broader than long, palm rather arched, finger very slender. Peraeopods 1 and 2 very slender, 4! joint twice as long as 5tl, Peraeopods 3—5 rather slender, 6" joint narrow, long, finger slight; 2° joint in peraeopod 5 nearly twice as long as broad, hind margin insinuate. Uropod 3, rami narrowly lanceolate, inner little longer than outer, both with setae as well as spinules on inner margin. Telson narrow, tapering, margins finely spinulose, cleft not quite to middle, apices acute, searcely divergent. Colour semipellueid, orange-tinted, reddish brown on hinder margins of segments, antennae 1 and 2 banded with red. L. © 12 mm. North-Atlantie and Aretie Ocean (Trondhjemsfjord, depth 188—282 m; Selsövig [Nordland]; Finmark). 3. E. antareticus G.M. Thoms, 1880 E. cuspidatus var. a., G. M. Thomson in: Ann. nat. Hist., ser.5 v.6 p.4 | 1888 E. longipes (err., non A. Boeck 1861!), T. Stebbing in: Bap- Voy. Challenger, v.29 p.965 t.87 | 1893 E.1.?, G. O. Sars, Crust. Norway, v.1 p-421 ! 1893 E. cuspidatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 669, 671. Eroeedingly like E. propinquus; differs in following points. Side- plate 1 more produced forward. Peraeon segment 7 with dorsal tooth more pronounced. Eyes rather dark brown (in spirit), visual elements well developed. Antennae 1 and. 2 apparently not calceoliferous. Antenna 1, 1st joint much thicker, scarcely longer than 24, in J transversely banded below with setules, accessory flagellum linear, length variable, but scarcely longer than 34 joint of peduncle, flagellum of many short joints, the 1° sometimes long. Antenna 2 in d, upper margin of ultimate and pen- ultimate joints of peduncle transversely banded with setules. Mandible, molar prominent, but smaller than that figured by Sars for E. propinquus. ne an = EZ ? 1 Se ET N Eee ee Eusirus 341 Maxillipeds, finger well formed, ending in a spine or nail, its concave margin armed with 4 spinules. Gnathopods 1 and 2 (Fig. 79) agreeing with E. longipes more nearly than E. propinquus. Uropod 3 in young C without, in adult 9 probably with a fringe of setae as in the two species compared. Telson eleft for barely °/, of length, apices a little divergent. L. 9 mm. South Paeifie (New Zealand); Southern Indian Ocean (Kerguelen Island, Heard Island). Depth 282 m. ’ 4. E.longipes Boeck 1861 E.1., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.656 | 1876 E. 1, A. Boeck, Skand. Arkt. Amphip., v.2 p.504 t.19 f.4 | 1893 E. 1, G.O.Sars, Crust. Norway, v.1 p.420 t.148 f.1 | ?1862 E. helvetiae, Bate (& Westwood), Brit. sess. Crust., v. 1 p. 267 £. | ?1862 E. h., E. helvetioe, Bate. Cat. Amphip. Brit. Mus,., p-155 t.29 f.1 | 1866 E. bidens, Cam. Heller in: Denk. Ak. Wien, v.2611 p.82 1.3 f.19 | 1893 E. cuspidatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 669. Body moderately slender, dorsal carina only slightly indieated, only pleon segments 1 and 2 produced into a dorsal tooth. Head, lateral corners obtusely truncate. Side-plate 1 well produced and rounded in front, side- plates 1—3 with 2 denticles at lower hind corner. Pleon segment 3, postero- lateral corners narrowly rounded, convex lateral margin coarsely serrate. Eyes very large, oblong reniform, bright red. Antenna 1, 1° joint subequal to 24, with several dentiform apieal projections, 24 with the usual 2, of which the inner is 5-dentate, flagellum nearly twice as long as peduncle, with 40—50 joints, calceoli- ferous, accessory flagellum very narrow, subequal to 39 joint of peduncle. Antenna2 RE REN considerably shorter, ultimate joint of ner ip pedunele longer than penultimate, together as long as flagellum, ultimate joint of peduncle and flagellum ealceoliferous. Gnathopods 1 and 2 moderately strong, process of 5% joint slender, 6! sub- quadrate, little broader than long, palm slightly arcuate, finger slender. Peraeopods 1—5 very slender and long. Peraeopods 1 and 2, 4% joint subequal to 6%, not nearly twice as long as 5th, Peraeopods 3—5, 24 joint not broadly oval, strongly serrate behind. Uropod 3, rami subequal, narrowly lanceolate. Telson comparatively small, tapering, cleft scarcely '/, of length, apices acute, very little divergent. Colour straw-yellow, mottled all over with brick-red specks; ova dark bluish green. . L. Q reaching 13 mm. Aretic-Ocean, North-Atlantic, North-Sea and Skagerrak (Norway, depth 56—188 m; Shetland Isles; Firth of Clyde; France); Adriatie. --5!b joint 6b joint -- . 5. E.leptocarpus 0. Sars 1893 E.?!., G.O.Sars, Crust. Norway, v.1 p.422 t. 148 f. 2. Hind part of body distinetly carinate, pleon segments 1—3 produced to dorsal tooth. Head, lateral corners truncate. Side-plate 1 well expanded, narrowiy rounded in front, hind corner smooth. Pleon segment 3, postero- lateral corners narrowly rounded, fine serration of lateral margin turning the corner as in E. propinquus. Eyes faintly traced in speeimens in spirit. Antenna 1, 1% joint subequal to 24, both long, flagellum shorter than pedunele, without calceoli, accessory flagellum linear, fully as long as 34 joint of peduncle. Antenna 2 not much shorter, ultimate joint of peduncle shorter than penultimate, flagellum about */, as long as peduncle, without calceoli. ee EN En ee BE NG ea 342 Eusirus Gnathopods 1 and 2 rather large, 5! joint long, distally attenuated, 6!" fully twice as broad as long, palm evenly curved, finger narrow, long. Peraeo- pods 1—5 rather slender. Peraeopods 1 and 2, 4 joint rather longer than 6th, nearly twice as long as 5tk,. Peraeopods 3—5, 24 joint narrowly oval, finely serrate behind. Uropod 3, rami subequal, narrowly lanceolate. Telson as in E. longipes (p. 341), but comparatively larger. L. Q 8 mm. Hardangerfjord, depth 564-752 m; Trondhjemsfjord. 6. E. biscayensis Bonnier 1896 E.b., J. Bonnier in: Ann. Univ. Lyon, v.26 p.651 1.39 £.1. Peraeon segment 7 with slight carina ending in denticle, pleon segment 3 with carina ending in tooth. Head, rostrum narrow, as long as 1° joint of antenna 1. Side-plate 1 quadrate. Pleon segment 3, postero-lateral margin serrate. Eyes reniform. Antenna 2, ultimate and penultimate joints of peduncle equal, flagellum calceoliferous. Mouth-parts in most respects normal, but inner plate of maxilla 1 with 2 setae, outer with 8 spines. Gnathopods 1 and 2, 5th joint elongate, hind lobe small, acute, with only 2 setae, 6! more than twice as broad as long; the long, curved palm defined by a little hollow with palmar spines. Peraeopods 1 and 2 very slender, 4tk joint not longer than 5th, Peraeopods 3 and 4, finger nearly half as long as 6t% joint. Uropods 1 and 2 spinulose, outer ramus little shorter than inner. Telson minutely notehed at apex. Antenna 1 except 1° joint, terminal joints of peraeopod 5, and uropod 3 unknown. L. 9 12 mm. Bay of Biscay. Depth 940 m. 7. E. minutus O. Sars 1893 E. m., G. O. Sars, Crust. Norway, v.1 p.419 £.147 £.2. Body rather stout, hind ‘part distinctly carinate, peraeon segment 7 and pleon segments 1 and 2 produced to a dorsal tooth. Head, rostrum pretty well developed, lateral corners transversely truncate. Side-plate 1 well expanded, both corners smoothly rounded. Pleon segment 3, postero- lateral eorners narrowly rounded, margin finely serrate only a little way up, serration turning the corner. Eyes faintly traced in specimens in spirit. Antenna 1 in © short, 1° joint thick, longer than 24 and 34 combined, with acute apical lobe, inner lobe of 24 joint bidentate. flagellum rather longer than pedunele, 10-jointed, without calceoli, accessory flagellum very minute. Antenna 1 in G much longer, flagellum about thrice as long as peduncle, with many joints, several of the proximal densely elothed with sensory setae. Antenna 2 alike in G and ©, ultimate joint of peduncle shorter than penultimate, flagellum about ’/,, as long as peduncle. Gmnathopods 1 and 2 not very strong, process of 5!" joint long, narrow, 6!" scarcely shorter than breadth at base, distally somewhat widened, palm little curved. Peraeo- pods 1—5 slender, less elongate than in E. propinquus (p. 340). Peraeo- pods 1 and 2, 4 joint as long as 6", not nearly twice as long as 5th, Peraeopods 3—5, 24 joint strongly serrate behind, in peraeopod 5 broadly oval, scarcely at all tapering distally as in other species. Uropod 3, outer ramus much shorter than inner. Telson rather long, tapering throughout, cleft searcely "/, of length, apices acute, standing well apart. L. 9 about 6 mm. Trondhjemsfjord. Depth 752 m. 8. E.holmii H.J. Hansen 1887 E.h., H.J. Hansen in: Dijmphna Udb., p.224 t.22 f.1—1b | 1893 E. h., G. O. Sars, Crust. Norway, v.1 p.416 | 1893 E. cuspidatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 669. Een Sa a in a R EREIOIIE A Ten FERNE DERETEN ui rn a: RE ” r ER DE ne a a Eusirus, Eusiropsis 343 Body rather slender, peraeon segment 6 a little thickened and rounded, segment 7 and pleon segments 1 and 2 produced into a prominent dorsal tooth, these 3 and 2 following segments carinate. Side-plate 1 produced ‚subacutely in front. Pleon segment 3, postero-lateral corners quadrate, above the acute point finely serrate-on lateral margin. Antenna 1 long, 1° joint as long as 24, flagellum more than twice as long as pedunele, in appearance serrate below, by distal widening of the proximal joints, accessory flagellum spine- like. Antenna 2 scarcely half as long, much more slender, ultimate joint of peduncle in 1 specimen considerably longer than penultimate, only a little in a smaller specimen. Gmnathopods 1 and 2 long, slender, 6!" joint trans- versely oblong ovate. Peraeopods 1—5 extremely slender and elongate. Peraeopods 1 and 2, 4tk joint not nearly twice as long as 5th, Peraeo- pods 3—5, 24 joint narrowly oval, distally narrowed, 4% shorter than 5tk, 5th much shorter than 6, which is 2'/,—3 times as long as 24, finger small, straight. Uropods 1—3 long, but strong. Telson narrow, tapering, cleft very short, widely separating the acute apices. Colour light rose-red. L. © 53 mm. Kara Sea. Depth 172—176 m. 2. Gen. Eusiropsis Stebb. 1897 Eusiropsis (Sp. un.: E. rüisei), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.39. Body (Fig. 80 p. 344) without dorsal projections. Head rostrate. Side- plates shallow. Pleon segment 3, postero-lateral corners not produced, lateral margin not serrate. Antenna 1 the shorter, accessory flagellum minute, ‚l-jointed. Antenna 2, ultimate joint of peduncle in S elongate, Mouth- parts nearly as in Eusirus (p. 338), but mandible with molar feeble, maxilla 1, inner plate unarmed, outer with 10 spines, 24 joint of palp narrower and scarcely longer than 1°. Gmnathopods 1 and 2 as in Eusirus, but hind lobe of 5th joint almost obsolete. Peraeopods 1 and 2 slender, finger ending obtusely and tipped with long setae. Peraeopods 3—5 slender, elongate, finger straight, acute, armed like the preceding joints with long setae. Branchial vesieles with accessory lobes. Uropod 3, rami lancevlate, spinulose, in J very plumose (Fig. 81 p. 344). Telson narrow, apically cleft. 1 species. 1. E. riisei Stebb. 1897 E. r., (nom. sp. Lütken in MS.) T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.39 t.13, 14. Peraeon segments 2, 3 and 4 shorter than the others, pleon segments 1—3 large. Head, rostrum triangular, longer than broad. Side-plates 1 and 2 very shallow, 24 distally narrowed, 34 securiform,“ front corner rounded, hinder acutely produced, 4" nearly transversely oblong, slightly emarginate, 5th and 6th with hind lobe produced. Pleon segments 1—3, postero-lateral eorners rounded (Fig. 80). Eyes wanting. Antenna 1 in J, 1° joint stout, with tufts of setules below, 24 a little shorter, calceoliferous, 34 short, flagellum rather stout, with at least 30 joints, calceoliferous. Antenna 2, penultimate joint of pedunele with tufts of setules above, ultimate joint much longer, longer than pedunele of antenna 1, calceoliferous, flagellum longer than peduncle, with 42 joints, 27 rather stout, with calceoli, rest more slender, with sensory filaments. Upper lip apieally rounded. Lower lip, inner lobes small. Mandible with 5 or 6 small spines in spine-row. Maxilla 2, inner plate rather broader 344 Eusiropsis than outer, scantily armed. Maxillipeds, outer plates not very large, finger of palp as long as 39 joint. Gnathopods 1 and 2, 5tk joint not very elongate, but having the attachment of the 6!" as in Eusirus, the hind lobe very N j Fig. 80. E.riisei. Lateral view. slight, 6! joint massive, distally widened, palm long, convex, carrying setules and ending in a spinigerous pocket, into which the long curved finger inserts its Uropod 1 Fig. sı. E.riisei. Uropods 1—3 and telson. -- Telson apex. Peraeopods1 and 2, finger not unguiform, less than half as long as 6{h, apical margin not acute, fringed with 6 plumose setae, mostly of great length. Peraeopod 3, 24 joint ex- panded, hind margin serrate, 4th, 5th and 6% joints all longer than 24, finger as long as 24 joint, the limb copiously supplied with spines and plumose setae. Peraeopod 4, 24 joint larger than in peraeopod 3, 5tk joint shorter than 6", Peraeopod 5. 24 jointlarger than in peraeopod 4, 5tk and 6!" not quite so long, plumose setae of striking length. In uropod 1 outer ramus a little more than half as long as inner, in uropod 2 a little less than half; in uropod 3 peduncle a little longer than in uropod 2, rami long, outer a little the shorter (Fig.81). Telson longer than pedunele of uropod 3, cleft about a quarter of length, apices acute, lateral margins with 2 notches. North-Atlantie (lat. 22° N., long. 36° W.). L. about 10 mm. 2 a än # = > 2 E F " # » Eusiroides 345 3. Gen. Eusiroides Stebb. 1888 Eusiroides, T. Stebbing in: Rep. Voy. Challenger, 2.29 .969 | 1893 E,, G.O.Sars, Crust. Norway, v.1 p.414 | 1893 E., A. Della Valle in: F. Fl. Neapel, 0.20 p.671. Body with rounded back, not carinate. Side-plate 1 distally widened. Calceoli present on antennae 1 and 2 in © ; accessory flagellum of antenna 1 "eonsisting of 1 narrow short joint. Maxilla 1 with 1—3 setae on inner plate, 10 spines on outer. Maxilla 2 with varying proportions of the 2 plates. Gnathopods 1 and 2, 5tb joint short, cup-shaped, attachment of 6 normal, 6! Jarge, oval, palm ill-defined except by spines, finger long, curved. Peraeopods 1—5 rather robust, 3I—5! with 24 joint large, broadly oval. In other respects scarcely differing from Eusirus (p. 338). 3 species accepted, 1 obscure. Synopsis of accepted species: Pleon segment3, postero-lateral margin not serrate 3. E.crassi. .. . . p. 346 | Pleon segment3, postero-lateral margin serrate — 2. 9 f Eyes derk-oloured . 22, 24 74 2 1. E. monoculoides . p. 345 \ Eyes light-eoloured. . . . . Er 2. E. dellavallei . . p. 346 l. E. monoculoides (Hasw.) 1880 Atylus m., Haswell in: P. Linn. Soe. N.S. Wales, v.4 p.327 t.18f.4 | 1888 A.m. + Eusiroides caesaris + E. pompeii, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.969; p.970 t.88; p.974 t.89 | 1893 E. m. + E. ce. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 674, 672. Pleon segments 1 and 2 dorsally produced to a small acute tooth, which is sometimes obsolete. Head, rostrum small, lateral corners rounded. Pleon segments 1 and 2 sharply quadrate or a little produced, segment 3 with postero-lateral margin very convex, serrate with 10—18 upturned teeth. Eyes very large, reniform, nearly meeting above, blue-black. Antennal, 1° joint as long as or longer than 24 and 34 combined, 34 less than half as long as 24, both these and flagellum calceoliferous, flagellum nearly twice as long as peduncle, attaining 74 joints, the proximal broader than long, elosely set with calceoli, many at intervals distally widened, terminal joints slender, without calceoli. Antenna 2 rather shorter, ultimate joint of peduncle calceoliferous, a little or scarcely shorter than penultimate, flagellum sometimes as long as peduncle, attaining 54 joints, arranged and armed as in antenna 1. Maxilla 1, inner plate carrying 2 setae, 1° joint of palp more than half as long as 24, which carries many setae on the outer margin. Maxilla 2, inner plate broader than outer, and not shorter. Gnatho- pods 1 and 2, 5tk joint spinose, 6! broadly oval, narrowest at hinge of finger, with transverse groove on outer surface near the base, palm long, convex, defined by transverse line of strong palmar spines on inner surface, palm border striated, set on both sides with spines and spinules, finger large, eurved, with channelled inner margin. Gnathoped 2 rather the larger. Peraeopods 1—5 rather robust, carrying many short spines, finger short and stout. Peraeopods 3—5, 24 joint well expanded, peraeopods 4 and 5 rather longer "than 34. Uropods 1—3 spinose, in uropod 1 outer ramus a little, in uropod 2 much shorter than the inner, which exceeds all the rest in length. Uropod 3, rami subequal. Telson rather long, tapering, eleft about to the middle, lateral margins slightly sinuous near base, apices narrow, bidentate. Colour light olive, with a few red spots on the antennae. L. 6—18 mm. South-Paeifie and southern Indian Ocean (Port Jackson, Jervis Bay and Melbourne, [Australia]; Heard Island). 346 Eusiroides, Cleonardo 2. E. dellavallei Chevreux 1893 E. caesaris (part.) (err., non T. Stebbing 1888!), A. Della Valle in: F. Fl. Neapel, v.20 p.672 t.3 f.8; t.17 £.37—48 | 1899 E. dellavallei, Cheryreux in: ©.-R. Ass. Franc., Sess. 27 v.2 p.479. In close general agreement with E. monoculoides (p. 345), but the large, reniform eyes are white with a faint rose tint; in antenna 1 the 34 joint is more than half as long as the 24; maxilla 1 has only one seta on the” inner plate and only one on outer margin of the palp’s 24 joint; maxilla 2 bas the inner plate shorter and narrower than the outer. Colour grey, tinged with yellowish red. L. about 13 mm. Mediterranean (Naples, France); Bay of Cadiz. 3. E. crassi Stebb. -1888 E. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 977 t.90 | 1893 E. caesaris (part.). A. Della Valle in: F. Fl. Neapel, v.20 p. 672. Differing little from E. monoculoides (p. 345). Pleon segments 1 and 2 not produced into teeth dorsally, but forming a small acute tooth at postero- lateral corners, segment 3 with those corners almost quadrate, with no serration. Eyes very large, reniform, almost contiguous at top of head. Maxilla 1, inner plate long and narrow, with 3 setae, 1° joint of palp half as long as 24, 24 with 1 seta on outer margin. Gmathopods 1 and 2, 6tk joint dilated about the middle, so that the palm instead of being continuous with the hind margin forms a well-marked obtuse angle with it. Telson shorter than in preceding species, cleft for less than half its length, evenly tapering to subacute apices, which in the single specimen were simple, without any notch. L. about 15 mm. South-Atlantie (lat. 87° S., long. 54° W.). Depth 1092 m. E. lippus (Hasw.). 1880 Atylus I. Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.328 t.20 f£.1 | ?1885 A.2., Chiltou in: P. Linn. Soe. N.S. Wales, v.9 p. 1037 | 1888 A.1., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 969. L. 6 mm. Port Jackson (Clark Island [East-Anstralia]); Sydney Harbour? 4. Gen. Cleonardo Stebb. 1888 Cleonardo, T. Stebbing in: Rep. Voy. Challenger, v.29 p.959 | 1895 C., G.O. Sars, Crust. Norway, v.1 p. 414. Body without dentate or serrate RER: Head rostrate. Side-plates 1—4 not large but notably deeper than the following, side-plate 1 not produced forward, 4t moderately emarginate. Antenna 1 longer than antenna 2 (Fig. 82), at least ind‘, both calceoliferous. Upper lip apically convex. Mandible normal, 34 joint of palp longest, slender. Maxilla 1, inner plate with 2 setae, outer with 11 spines, 24 joint of palp not widened distally. Maxilla 2, inner plate broader than outer. Maxillipeds, inner and outer plates not very large, armature normal, palp long. Gnathopods 1 and 2, 5 joint short, lobed, 6th elongate oval, finger long, slender, curved. Peraeopods 1—5 (Fig. 83) very slender, finger long. Peraeopods 3—5 long, not very unequal. Uropod 3, rami lanceolate. Telson long, tapering, deeply cleft. 2 species. Synopsis of species: Uropods with the rami unequal, spinulose . . .... 1. C.longipes . . . p.347 Uropods with the rami equal, almost unarmed . . . . 2. C. appendiculatus p. 347 Cleonardo, Rhachotropis 347° 1. C. longipes Stebb. 1888 C. 1, T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 959 t.86 | 1893 Pontogeneia l., A. Della Valle in: F. Fl. Neapel, v.20 p.618 t.59 £.31. . 9 unknown. — J. Head, rostrum short and broad. Side-plates 1--4 rounded below. Pleon segments 1—3, postero-lateral corners more or less acutely produced. Eyes not perceived. Antenna 1, 1° joint stout, with obtuse apical tooth, 2% rather longer, 34 very short, flagellum longer than peduncle, with 46 joints, only 1° joint long, most with 24 and 34 joints of pedunecle calceoliferous. An- tenna 2 (Fig. 82) rather shorter, ultimate and penultimate joints of peduncle long, ultimate the shorter and much narrower, flagellum shorter than peduncle, with 35 joints, many with ultimate joint of peduncle calceoliferous. Gnathopods 1 and 2 rather strong, 5 joint eup-shaped, with spinose hind lobe, 6!" oval, apically narrowest, palm long, oblique, curved, eiliated, defined by a tooth with palmar spines. Peraeopods 1 and 2, finger as long as 6! joint, with setules on the convex margin. Peraeopods 3—5, 24 joint oval, in peraeopod 5 (Fig. 83) produced some- what downward, 5th—7th joints very long 24 joint Flagellum and slender. Pleopods 1—3, each pair closely Fig. 9. Fig. 83. united by very short coupling spines and Aue 3 NE ‚Peraeopod 5. numerous cleft spines. Uropods 1—3 very spinulose, outer ramus shorter and narrower than inner. Telson nearly reaching end of uropod 3, cleft for more than ®/, of length, margins finely pectinate, apices acute, not dehiscent. L. 10 mm. South-Paeifie (lat. 370 S., long. 83° W.). Depth 3244 m. 2. C. appendiculatus (0. Sars) 1879 Tritropis? appendiculata, G. O. Sars in: Arch. Naturv. Kristjan., v.4 p.451 | 1885 T.a., G. ©. Sars in: Norske Nordhavs- Exp., 0.6 Crust. I p.194 t.16 f.3,3a | 1888 T. a., Cleonardo (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.498, 959 |; 1898 Pontogeneia?, A. Della Valle in: F. Fl. Neapel, v.20 p. 620. Peraeon inflated, back rounded, pleon segments 1—3 with distinet but low central carina. Head, rostrum exceedingly small, slightly curved, lateral corners slightly produced, narrowly rounded. Pleon segments 1—3, postero-lateral cornmers acute, postero-lateral margins quite smooth. Eyes very small, oval. placed low down, pigment light, whitish. Antennae 1 and 2 nearly as in C.longipes, but 24 joint of antenna 1 rather shorter than 1%. Mouth-parts undescribed. Gnathopods 1 and 2, peraeopods 1—5 closely resembling those in €. longipes. Uropods 1—3 each with lanceolate, - equal rami, without distinet spines or setae. Telson unknown. Colour whitish, translucent. L. 13°5 mm. Arctie Ocean (lat. 71° N., long. 13° E.). Depth 2423 m. Fig. 82 &83. CO. longipss, g. 5. Gen. Rhachotropis S. I. Sm. 1871 Tritropis (non Fitzinger 1843, Reptilia!) (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.158 | 1883 Rhachotropis, S. I. Smith in: P.U.S.Mus., v.6 p.222 | 1888 R., T. Stebbing in: Rep. Voy. Challenger, v.29 p.954 | 1893 R., G. O. Sars, Crust. Norway, v.1 p.423 | 1896 Rachotropis, J. Bonnier in: Ann. Univ. Lyon, v.26 p. 658. 348 Rhachotropis _ More or less of the body dorsally and subdorsally carinate. Head rostrate. Side-plates rather small, 1° narrowly produced forward, 4 very slightly emarginate. Pleon segment 3, postero-lateral corners rounded, serrate above. Antenna 1 generally shorter than antenna 2, and sometimes with small 2-jointed accessory flagellum. Antennae 1 and 2 larger in C than in Q. Mouth-parts nearly as in Eusirus (p. 338). Maxilla 1, outer plate with 9 spines (sometimes 8°). Gnathopods 1 and 2 strong, subequal, 5th joint short, cup-shaped, 6" large, oblong oval, palm very oblique. Peraeopods 1—5 slender, long, 5" very long, its 24 joint larger than that in 34 and 4 pairs. Uropod 3, rami foliaceous. Telson long, more or . less cleft. 11 species. Synopsis of species: angle — 2. Peraeopod 5, 2d joint not acute at lower hind angle — 3. 1 Telson cleft for more than a quarter of its ER » » . 1. B, aculeata ... . .. p.348 Telson eleft for less than a quarter of its lengt 2. R. kergueleni . . . p.349 | Peraeopod 5, 2d joint acute at lower hind . teeth upturned — 4. Pleon segments 1—3 not having some of the Pleon segments 1---3 having some of the dorsal ; | dorsal teeth upturned — 5. R.grimaldii. . . . p.350 ZB elogans'. ...,.% p- 850 f Antenna 1 without accessory flagellum \ Antenna 1 with 1-jointed accessory flagellum 5 [ Eyes well developed — 6. Eyes not well developed — 9. f Antenna 1, 34 joint very short... ... . 5. R. oceulata. . . .. . p.350 \ Antenna 1, 3d joint not very short — 7. 8 4 6 medio-dorsal tooth . ... .. „ar... 2 6. RB. inflata . . .. . p. 351 | Peraeon segment 7 and pleon segment 3 with medio-dorsal tooth — 8. | Peraeon segment 7 and pleon segment 3 without | Peraeopod 5 not so long as the body . . . 7. R.helleri ..... p. 351 Peraeopod 5 longer than the body . . . . . ‘8. R. macropus. . . . p.352 9 Diyer nuidnienlalv a. N rn, 0 9. R. leucophthalma . p. 353 Eyes wanting — 10. 10 f Pleon triearinate on segments 2—4. .. . . 10. R.rostrata . . . . p.353 1 Pleou not -teignsinale 2. a En A 3) p. 853 1. R. aculeata (Lepech.) 1780 Oniscus aculeatus, Lepechin in: Acta Ac. Petrop., 17781 p.247 t.8 f.1 | 1866 Amphithonotus a., Goes in: Ofv. Ak. Förh., «.22 p-526 | 1874 A. a. (part.), Buchholz in: Zweite D. Nordpolarf., v.2 p.316 Crust. t.4 | 1871 Tritropis aculeata, A. Boeckin: Forh. Selsk. Christian., 1870 p.158 | 1872 & 76 Acanthonotus aculeatus + T. aculeata, A. Boeck, Skand. Arkt. Amphip., v.1 p.37; v.2 p.5ll | 1883 Rhachotropis aculeata, R. aculata, S. I. Smith in: P. U. S. Mus., 0.6 p.229, 222 | 1893 R. aculeata, G.O. Sars, Crust. Norway, v.1 p.424 t. 149 | 1894 R. aculeatus, T. Stebbing in: Bijdr. Dierk., ©. 17 p.37 | 1898 Pontogeneia aculeata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.616 1.59 £.28 | 1821 Talitrus edvardsii, E.Sabine, An.north. Exp., p.55 t.2 f.1—4 | 1835 Amphithoe edvardsi, J. C. Ross in: John Ross, App. sec. Voy., nat. Hist. p-90 | 1846 A. edwardsii, Kroyer in: Naturh. Tidsskr., ser.2 v.2 p.76 | 1862 Amphithonotus e., WA a ERTL Zu Dre Pan DE Ba a DR FT = Fr a Ko a ae En BE Fe TE ae a ET A ER T a N EEE, Rhachotropis 349 Bate, Cat. Amphip. Brit. Mus., p.151 t.28 f.5 | 1867 Amphitonotus e., Packard in: Mem. Boston Soe., v.1 p.297 | 1882 Tritropis avirostris, G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.105 t.5 f.8 | 1888 Rhachotropis aculeatus (part.) + R. avirostris (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.49, 954; p. 540. }: Peraeon segments 1—5, dorsal carina faintly indicated in large speeimens, F segment 6 with 3 teeth, segment 7 and pleon segments 1—4 triply carinate, carinae produced into sharp teeth except the lateral of segment 4, which, however, like the 5t" and 6", has a small lateral tooth. Peraeon segment 7 has E lateral corners acute. Central carina forms 2 successive teeth on each B. ‘of pleon segments 1—4. Head with dorsal hump, rostrum nearly reaching end of 1° joint of antenna 1, acute, channelled above, carinate below, lateral corners with a triangular, somewhat deflexed lobe. Side-plate 1 concave below, front corner acute, 1°—34 with hind corner acute, 5tR and 6! sligchtly ridged behind. Pleon segment 3, lateral margin very finely serrate. Eyes large, convex, rounded triangular, dark brown. Antenna 1, ‚1° joint large, as long as 24 and 34 combined, with apical tooth, 34 very short, 24 and 34 calceoli- ferous, flagellum longer than peduncle, with about 65 short joints, each with calceolus; accessory flagellum 2-jointed. Antenna 2 rather longer, ultimate and penultimate joints of peduncle subequal, calceoliferous, flagellum longer than pedunele, with about 85 calceoliferous joints. Gnathopods 1 and 2 nearly equal, 6% joint powerful, palm defined by obtuse spiniferous tooth, finger long, evenly curved. Peraeopods 1—5 moderately slender. Peraeopods 3 and 4, 24 joint rather small, hind margin proximally produced to acute triangular process. Peraeopod 5, 24 joint broad above, hind margin angular above the middle, acutely produced at apex. Uropods 1 and 2, outer ramus R much the ‚shorter; uropod 3, outer ramus a little the shorter, both narrowly Be lanceolate; all the rami closely spinulose. Telson very long, tapering, — — elosely margined with spinules, cleft '/, of length, apices approximate, acute. Colour variegated with brown, orange and pure white, gnathopods 1 and 2 carmine. L. 30—44 mm. Arctic Ocean (widely distributed, eircumpolar, reaching lat. 82° 27’ N.). Depth 19—263 m. 2. R. kergueleni Stebb. 1888 R. k., T. Stebbing in: Rep. Voy. Challenger, v.29 p.955 .85 | 1895 R.k., G@. O. Sars, Crust. Norway, v.1 p.424 | 1893 Acanthozone k., A. Della Valle in: F. Fl. Neapel, v.20 p.612 t. 59 f. 24. Peraeon very short, pieon segments 1—4 long, tricarinate, each produced into a dorsal tooth, largest on segment 2, segments 1 and 2 with smaller tooth on each side. Head, rostrum very long, narrow, subdepressed, lateral corners narrow, prominent. Side-plate 1. produced linguiform, 4 moderately excavate, 5th and 6th slightly serrate behind. Pleon segment 3, lateral margin firmly serrate. Eyes not perceived. Antenna 1, 1% and 24 joints subequal, 34 not !/, as long as 24, flagellum much longer than pedunele, with 34 joints, those of distal half very slender, accessory flagellum not perceived. Antenna 2 longer, penultimate joint of peduncle long, fringed with plumose eilia, 3 ultimate much longer, flagellum longer than peduncle, abruptly narrower, j with 37 slender joints. Mandible, molar rather small, palp very large. E Gnathopods 1 and 2 similar, gnathopod 2 the larger; 5th joint with distal lobe ß well produced, very spinose, 6% large, broadly oval, distally narrowed, palm well defined by spinose tooth, finger long, much curved. Peraeopods 1—5 very slender. Peraeopods 3 and 4, 24 joint very small, in peraeopod 5 5 \ j 350 Rhachotropis much larger, but still small, in all 3 oval, with lower hind corner acute. Uropod 1, rami nearly equal; uropod 2, outer ramus somewhat shorter than inner; uropod 3, rami nearly equal, broad and long, narrowing rather abruptly to the acute apex; all the rami spinuliferous. Telson long, narrow, spinuliferous, more than 3 times as long as broad, tapering little till near the acute apices, which are separated by an exceedingly short slightly dehis- cent slit. L. 11 mm. Southern Indian Ocean (Kerguelen Island). 3. R. grimaldii (Chevreux) 1887 Tritropis g., Chevreux in: Bull. Soe. zool. France, v.12 p.571 | 1888 Bhachotropis g., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1641 | 1893 R. g., G. O. Sars, Crust. Norway, v.1 p. 424. Peraeon inflated, slightly carinate but without teeth, pleon segments 1—3 tricarinate, the carinae produced into long sharp teeth, upturned, especially those on segment 3. Head, rostrum short, straight, forming an angle with upper surface of head, lateral corners elongated, slightly rounded at apex. Side-plate 1 produced into a narrow angular lobe, lower margin behind ending in an obtuse tooth. Pleon segment 3, postero-lateral lobe prolonged backward, broadly rounded, firmly serrate. Antenna 1, 1° joint ending in 2 denticles, 24 rather longer, 34 not quite half as long as 24, flagellum 11-jointed; no trace of accessory flagellum. Antenna 2 longer, ultimate and penultimate joints of peduncle long, equal, fagellum 14-jointed. Gmathopod 1, 5% joint with long narrow lobe, 6!" large, elongate oval, finger shorter than palm, thin, eurved. Gnathopod 2 unknown. Peraeopods 3 and 4, 24 joint narrow, smooth. Peraeopod 5, 24 joint with hind margin broadly rounded, strongly serrate. Uropods 1—3 long and equal(?). Telson very long, cleft '/, of length. L. 11 mm. North-Atlantie (Cape Finisterre). Depth 510 m. 4. R. elegans (Bonnier) 1896 Rachotropis e., J. Bonnier in: Ann. Univ. Lyon, v.26 p.658 1.39 f.4. Perhaps identical with R. grimaldii. Slightly compressed, peraeon segments 1—7 dorsally raised behind, produeing a regularly undulating profile, pleon segments 1—3 tricarinate, carinae produced into teeth, some slightly upward turned, the central preceded by a small hump, segments 4—6 without any crest. Head with dorsal bump, rostrum very small. Pleon segment 3, postero-lateral margins rather produced, firmly serrate. Eyes wanting. Antenna 1 in d, 1° joint long, little longer than 24, 34 very short, flagellum longer than peduncle, accessory flagellum a single very short joint. Antenua 2 much longer, ultimate joint of peduncle rather longer than penultimate, flagellum much longer than peduncle. No calceoli, but many long sensory setae. Peraeopod 5, 24 joint figured as oblong oval, not narrowed below. Telson reaching extremity of uropod 3 (in figure surpassing it), cleft ”/, of length. Many parts figured, but not described. L. a little over 9 mm. Bay of Biscay. Depth 950 m. 5. R. oculata (H.J. Hansen) 1887 Tritropis o., H. J. Hansen in: Vid. Meddel., ser.4 0.9 p.140 t.5 £.7—7e | 1888 Rhachotropis o., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1644, 1721 | 1893 R.o., 6. O. Sars, Crust. Norway, v.1 p.424 | 1893 Pontogeneia aculeata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 616. Rhachotropis 361 Body thick, broad, peraeon unarmed, except for dorsal dentiele on segment 7, which has the hind corners acute, pleon segments 1—3 tricarinate, teeth acute, except dorsal tooth on segment 3, which is subacute. Head, rostrum rather small, lateral corners little produced, slightly rounded. Side-plate 1 u = nearly twice as broad as deep. Pleon segment 3, postero-lateral margin _ firmly serrate. Eyes very large, triangular, occupying major part of head’s “surface, nearly meeting at top, black. Antenna 1, 1° joint very stout, not very long, but as long as 24 and 34 combined, 34 very short, flagellum rather longer than peduncle, 23-jointed; accessory flagellum apparently wanting. Antenna 2 subequal to antenna 1, flagellum rather shorter than peduncle. Gnathopods 1 and 2, 6! joint large, broadly oval, defining tooth - of palm not very prominent. Peraeopods 1--5 long, slender, successively longer. Peraeopods 3—5, 24 joint piriform, very small in peraeopods 3 and 4, much larger but still small in peraeopod 5. Telson more than twice as long as broad, tapering to the acute, little separated apices, cleft °/,, of length. L.9 95, 9 11’5 mm. Arctie Ocean (Greenland). Depth 19—81 m. 6. R.inflata (O0. Sars) 1882 Tritropis i., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p. 104 t.5 f.7 | 1888 Rhachotropis i., T. Stebbing in: Rep. Voy. Challenger, v. 29 p- 540 | 1893 & 95 R. tümida, R.i., G.O.Sars, Crust. Norway, v.1 p.430 t.152; p. 697 | 1893 Pontogeneia aculeata (part.)?, A. Della Valle in: F. Fl. Neapel, 0.20 p. 617. Body rather short, peraeon much inflated, dorsally smooth, pleon segments 1—3 tricarinate, carinae produced into small teeth, except central 3 - of segment 3, segments 4—6 quite smooth. Head very broad, rostrum rather prominent, lateral corners linguiform, slightly deflexed. Side- plates nearly as in R. helleri. Pleon segment 3, postero-lateral margins strongly serrate, serration turning the corner. Eyes very large, convex, rounded oval, or reniform, dark brown. Antenna 1 in Oo short, without distinet calceoli, 1° joint longer than 24, 34 scarcely half as long as 24, flagellum longer than peduncle, 9-jointed; accessory flagellum 2-jointed. Antenna 2 in O little longer, ultimate and penultimate joints of peduncle subequal, flagellum half as long as peduncle, 8- or 9-jointed. Antennae l and 2in d much longer; antenna 1, flagellum with 12 joints, 1° very long, densely clothed with sensory setae. Gnathopod 1, 6!" joint oval, breadth much more than half length; gnathopod 2, 6tk joint twice as long as broad; in both the palm evenly curved, defined by slight angle carrying 1 spinule, finger long, eurved. Peraeopods 1—5 slender, of moderate length, 24 joint in peraeo- pod 3 very slightly expanded, in peraeopod 5 much broader, narrowing ‚ distally. Uropods 1-3, outer ramus notably shorter than inner, rami of uropod 3 narrowly lanceolate. Telson less elongate than usual, carıying a large sensory setule above the middle on each side, thence rapidly tapering to the acute contiguous apices, cleft almost to the centre. Colour generally variegated with patches of carmine and specks of golden yellow, antennae 1 and 2 and limbs banded. L. O searcely more than 6 mm, J somewhat less. Aretie Ocean, North-Atlantic, North-Sea and Skagerrak (Greenland; Kara Sea; Norway, depth 19—94 m). 7. R. helleri (Boeck) 1871 Tritropis h., A. Boeck in: Forh. Selsk. Christian., 1870 p.159 | 1876 T.h., A. Boeck, Skand. Arkt. Amphip., 0.2 p.518 t.20 £.6 | 1893 Rhachotropis h., G. O. Sars, Crust. Norway, v.1 p.426 t.150 | 1888 R. aculeatus (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.954 | 1898 Pontogeneia aculeata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 616. En EEE WENTR a En: 352 Rhachotropis Body rather slender, peraeon segments 1—3 dorsally a little raised behind, segment 7 produced to a very small dorsal tooth, pleon segments 1—3 tricarinate, carinae ending in teeth, the central on segment 3 much smaller and more obtuse than the preceding, segment 4 with dorsal tooth, lateral ridges not produced. Head, rostrum short, lateral corners narrow triangular. Side-plate 1 linguiform, lower margin straight, corners not acute, 4 slightly emarginate, 5! and 6‘ without lateral ridge. Pleon segment 3, postero- lateral margins firmly serrate. Eyes rather large, rounded oval, light brown. Antenna 1 in O not very long, 1°* joint not as long as 24 and 34 combined, 34 about half as long as 24, both calceoliferous, flagellum subequal to peduncle, 12—15-jointed, calceoliferous; accessory flagellum 2-jointed. Antenna 2in oa little longer, ultimate and penultimate joints of pedunele subequal, fringed above with calceoli, together as long as flagellum of about 14 joints. Antenna 1 in C more than twice as long as in O, flagellum at base carrying faseieles of sensory filaments. Antenna 2 in J rather longer, flagellum nearly twice as long as pedunecle. Gnathopod 1 rather strong, somewhat smaller than other- wise similar gnathopod 2, 6! joint oblong oval, about twice as long as broad, elongate palm defined by very slight spiniferous angle. Peraeopods 1—5 more slender and with more elongate fingers than in R. aculeata (p. 348); peraeopods 3—5 rapidly encreasing in length, 24 joint simple, oblong oval, a little narrowed below, 6 joint very long in. peraeopod 5, which is about ®/), as long as the body. Uropods 1—3, outer ramus not much shorter than inner, in uropod 3 both rami subfoliaceous, abruptly tapering to the apex, marginal spinules few. Telson unarmed, not strongly tapering till near the acute contiguous apices, cleft nearly to the middle. Colour semipellucid, whitish, blotched with light red. L. Q 12, S 10 mm. Arctie Oeean, North-Atlantie, North-Sea and Skagerrak (South- and West-Norway). Depth 94--188 m. Other localities doubtful. 8. R. macropus V. Sars ?1874 Amphithonotus aculeatus (part.), Buchholz in: Zweite D. Nordpolarf., v.2 p.316 | 1882 Tritropis helleri (err., non 'A. Boeck 1871!), Hoek in: Niederl. Arch. Zool., suppl. 1 nr.7 p.58 | 1894 Rhachotropis h., T. Stebbing in: Bijdr. Dierk., v.17 p.37 | 1893 R. macropus, G. O. Sars, Urust. Norway, v.l p. 428 t. 151 £.1. Very like R. helleri (p. 351), but peraeon segments not dorsally raised; segment 7 produced to very small tooth, pleon segments 1—3 tricarinate, carinae ending in teeth, central of segment 3 like the preceding, segment 4 with dorsal tooth, lateral ridges not produced. Pleon segment 3, postero-lateral margins strongly serrate, serration turning the corner. Eyes large, rounded, dark brown with whitish coating. Antenna 1 in Q moderately long, 1° joint as long as 24, 34 more than half as long as 24, both densely calceoliferous, flagellum searcely as long as peduncle; accessory flagellum 2-jointed. Antenna 2 subequal, ultimate joint of peduncle longer than penultimate, flagellum not nearly equal the 2 joints combined. Peraeopods 1—5 much more elongated and slender, peraeopod 5 longer than the whole body. Uropods 1—3 and telson not notably differing from those of R. helleri, but telson large, extending beyond uropod 3, cleft to the centre, apices only subacute. Colour whitish, blotehed with reddish orange, patches generally less confluent than in R. helleri. L. © 16 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway, depth 188—752 m; Barents Sea; Kara Sea; Spitzbergen.) Rhachotropis 353 9. R. leucophthalma O. Sars 1893 R. L., 6.0. Sars, Crust. Norway, ol p.499 t. 151.2. Rather less slender than R. maeropus, otherwise like it in general. Peraeon segments 1—7 without teeth, pleon as in R. macropus, but tooth of 4th segment unusually large. Head, lateral corners very narrow. Side- ' plates as in R. macropus. Eyes quite rudimentary, represented by 2 irregular yellowish white patches of pigment. Antenna 1 not very long, 1° joint subequal to 24, 34 more than half as long as 24, flagellum subequal to peduncle; accessory flagellum 2-jointed. Antenna 2 a little longer, ultimate joint of - peduncle longer than penultimate, flagellum not nearly as long as both combined. Gnathopods 1 and 2 rather powerful, similar to those of R. macropus, as also peraeopods I—5, but peraeopod 5 shorter than the body. Uropods 1--3 as in R. macropus, telson shorter, not extending beyond uropod 3, more tapering distally, cleft to the centre. Colour light yellowish, tinged with reddish orange, and pinkish on mouth-parts and gnathopods 1 and 2. L. © 14 mm. North-Atlantie, North-Sea and Skagerrak (Norway). Depth 188—752 m. 10. R. rostrata (Bonnier) 1896 Rachotropis r., J. Bonnier in: Ann. Univ. Lyon, 0.26 p.658 1.39 2. - Peraeon segments 1—7 smooth, not produced, pleon segment 1 slightly earinate behind, without lateral earinae, -segments 2, 3 and 4 tricarinate, earinae produced into teeth on segment 27 ending obtusely on segment 3, the central produced into a tooth on segment 4. Head, rostrum reaching along ?/, length of 1° joint of antenna 1, slightly deflexed, lateral corners produced to a truncate lobe. Side-plates of the usual form; pleon segment 3, postero-lateral margins eut into 10 sharp teeth. Eyes entirely wanting. Antennal in S, 1% joint as long as 24 and 34 combined, 24 calceoliferous, 34 less than half as long as 24, flagellum much longer than peduncle, with 20 joints, 1st very long, densely elothed, accessory flagellum wanting. Antenna 2 much longer, ultimate and penultimate joints of peduncle subequal, calceoliferous, flagellum longer than peduncle, with 40 elongate joints. Maxilla 1, inner plate with only .1 seta, outer with 8 spines. Gnathopods 1 and 2 nearly as in R. helleri (p. 351), but 5*" joint with lobe apparently very little produced, palmar angle set with 3 strong spines. Peraeopods 1—5 slender, elongate, 24 joint of peraeopod 5 broad proximally. Uropods 1 and 2, outer ramus rather the shorter; uropod 3, rami lanceolate, equal; all rami minutely spinulose. Telson tapering, not reaching extremity of uropod 3, carrying a pair of plumose cilia above the centre of lateral margins, eleft less than '/, of length. L. 13 mm. Bay of Biscay. Depth 950 m. Be 11. R. graeilis (Bonnier) 1896 Rachotropis g., J. Bonnier in: Ann. Univ. Lyon, 0.26 p.657 t. 39 £.3. Body compressed, dorsally carinate on peraeon segments 1—7 and pleon segments 1—4, earina produced into a small tooth only on pleon segments 1—4 (in text: on segments 1—3), no lateral carinae. Head, rostrum very short, lateral angles apparently aeute, little produced. Side-plate 1 (in figure) not produced forward. Pleon segment 3, postero-lateral margins with only 3 scarcely visible dentieles. Eyes wanting. Antenna 1 in JG short, 1° and 24 joints long, equal, 32 much less than half as long as 24, flagellum shorter than Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 23 354 Rhachotropis, Rozinante peduncle, accessory flagellum 2-jointed, nearly as long as‘ 1% joint of flagellum. Antenna 2 in adult 9 longer than the whole body, ultimate joint of peduncle longer than penultimate, both elongate. Upper lip, apex produced, narrowly rounded. Maxilla 1, inner plate with 1 seta, outer with 9 spines. Maxillipeds with elongate palp. Gnathopods 1 and 2 as in R. inflata (p. 351), with which also peraeopods I—5 appear nearly to agree, but in peraeo- pod 5 the 5®% joint is rather longer than the 6!" instead of the reverse. Uropod 3, rami foliaceous, rather blunt. Telson nearly reaching extremity of uropod 3, tapering but slightly, ending in a very small triangular emargination. L. about 10 mm. Bay of Biscay. Depth 950 m. 6. Gen. Rozinante Stebb. 1871 Tritropis (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.158 | 1894 Rozinante (Sp. typ.: R. fragilis), T. Stebbing in: Bijdr. Dierk., v.17 p.38 | 1899 R.. T. Seott in: J. Linn. Soc., v.27 p. 77. Front part of pleon carinate. Head minutely rostrate. Side-plates small, 1° narrowly produced forward. Pleon segment 3, postero-lateral margins denticulate. Antennae 1 and 2 sexually varying in length. Antenna 1 shorter than antenna 2, without accessory- flagellum. Upper lip slightly emarginate. Mandible, eutting edge dentate, accessory plate on both mandibles, many spines in spine-row, molar prominent, 34 joint of palp not longer than 24, Maxilla 1, inner plate with 4 setae, outer with 11 spines, 24 joint of palp distally widened, fringed with numerous spines. Maxilla 2, plates moderately long. Maxillipeds, inner and outer plates moderately long, finger of palp attached below the abruptly narrowed apex of 34 joint. Gnathopods 1 and 2 subchelate, 5th joint elongate, unlobed, 6% narrow, finger short. Peraeopods 1—5 slender, 5th the longest. Uropod 3 reaching much beyond the others, rami long, lanceolate, subequal, spinulose. Telson short, partially cleft. l species. . 1. R. fragilis (Go&s) 1866 Paramphithoe f., Go&s in: Öfv. Ak. Förh., v.22 p.524 t.39 f.16 | 1871 Tritropis f., A. Boeck in: Forh. Selsk. Christian., 1870 p.160 | 1874 T. f., Buchholz in: Zweite D. Nordpolarf., v.2 p. 320 Crust. t.3 f.1-| 1876 T. f., A. Boeck, Skand: Arkt. Amphip., v.2 p.515 | 1888 Rhachotropis f., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 356 | 1894 Rozinante f., T. Stebbing in: Bijdr. Dierk., v.17 p.39 | 1899 R. f., T. Scott in: J. Linn. Soc., v.27 p.77 | 1893 Pontogeneia aculeata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.617. Pleon segments 1—3 obtusely tricarinate, carinae not produced into dorsal teeth, but notched at end of lateral keels. Head, lateral corners slightly produced, obtuse, post-antennal corners very acutely produced, with serrate upper margin. Side-plates 5—7 serrate on hind margin. Pleon segment 2, postero-lateral corners a little acutely produced, segment 3 rotundo-quadrate, postero-lateral margins of segments 1—3 finely serrate (or strongly, Buchholz). Eyes large, subglobose or subreniform, black. Antennal, 18 joint longer than 24 and 34 combined, all with apical teeth, 24 joint only sometimes longer than 34, flagellum thrice as long as pedunele, of many short joints. Antenna 2, ultimate joint of peduncle as long as apically dentate penultimate, flagellum much longer than peduncle. Gnathopods 1 and 2, 5tk joint as long as or rather longer than 6!%, widened a little distally, Rozinante, Bateidae, Batea 355 6% joint two and a half times as long as broad, widening slightly to the not very oblique palm, which is overlapped by the denticulate finger. Peraeo- pods 3—5;, 24 joint narrowed distally, serrate on hind margin, finger long, slender. Uropods 1 and 2, outer ramus much shorter than inner, neither very long. Uropod 3; outer ramus very little shorter than inner. Telson about once and a half as long as broad, eleft from '/;—'/, of length, lateral margins serrate and also obtuse apices. Colour pale reddish yellow, with faint red markings. L. reaching 22°5 mm. : Arctie Ocean (Greenland; Spitzbergen; Cape Wynn, depth 6 m; Barents Sea, depth 372 m). ; 28. Fam. Bateidae Head strongly rostrate. Side-plate 1 rudimentary. Antenna 1 without accessory flagellum. Mandible with palp. Gmnathopod 1 degraded, without hand. Telson cleft. Marine. Zu En Be Br: z # . 1 genus, 1 species. 1. Gen. Batea Fr. Müll. = 1865 Batea (Sp. un.: B. catharinensis), Fritz Müller in: Ann. nat. Hist., ser. 3 Be 16 p.276. 3 Body not dentate. Side-plate 4 rather large and deeply excavate behind. Antenna 1 little shorter than antenna 2. Maxillipeds, outer plates fully reaching apex of palp’s 24 joint, fringed with spine-teeth on inner margin. Gnathopod 1 degraded, ending with a feeble linear 24 joint, which is longer in the o than in the d. Gnathopod 2 subchelate. Peraeopods 3—5, 24 joint expanded. Uropod 2 shorter than uropod 1 or 3; uropod 3, peduncle short, _ rami subfoliaceous. Telson rather short, deeply cleft. 1 species. 1. B. catharinensis Fr. Müll. 1865 B. c., Fritz Müller in: Ann. nat. Hist., ser.3 v.15 p. 276 t.10. Segment 7 of peraeon much the longest. Head, rostrum (in figure) nearly as long as 1° joint of antenna 1, very blunt. Pleon segment 3, postero- lateral eorners subquadrate, seemingly with spinules on the straight part of hind margin. Eyes large, dark, reniform, larger in C’ than in Q. Antennael and 2 longer in S than in Q. Antenna 1, 24 joint narrower and a little shorter than 1°, flagellum many-jointed, setae of alternate joints direeted downward in Q, backward in d. Antenna 2, ultimate and penultimate joints of pedunele subequal, with fascieles of hairs on upper side, but only ind, flagellum many-jointed, with long upward directed setae on alternate joints, but only inO. Gnathopod 1 with more hairs in O than in d. Gnathopod 2, 5th joint shorter than 6tk, distally widened, 6tk oval, palm subequal to hind margin, defined, but not very sharply. Peraeopods 1 and 2 with long hairs on hind margin of 5tt and 6!" joints, but only in d. Uropod 1, peduncle much longer than rami; uropod 2, peduncle little longer than rami; uropod 3, 238% 356 Batea, Pontogeneiidae, Eurymera rami subequal in length, one stouter, both fringed with plumose setae. Telson with rounded apices. L.? South-Atlantie (Desterro [Brazil]). 29. Fam. Pontogeneiidae Body eompressed, with or without dorsal teeth. Head, rostrum un- important. Side-plates 1—4 rounded. Antenna 1, peduncle not elongate, accessory flagellum usually wanting, 1-jointed when present. Upper lip rounded. Lower lip with inner lobes weakly developed or wanting. Mouth-parts in general normal. Gmathopods 1 and 2, hands not powerful, subchelate. Uropod 3, rami subequal, of moderate size. Telson deeply cleft. Marine. 7 genera, 9 accepted species, 4 obscure. Synopsis of genera: n | Antenna 1 without accessory flagellum — 2. Antenna 1 with accessory flagellum — 6. | Body veryrobust, middle side-plates verydeep—.3. 2 2 Body not very robust, middle side-plates not ) very deep — 4. 3 | Inep0od'8 very shert 5:25 l. Gen. Eurymera . . . p.356 Uropod 2 Dos anorl, #28. Wer 2. Gen. Bovallia. . . . p.357 A { Antenna 1 longer than antenna 2... ... 3. Gen. Stebbingia. . . p.358 Antenna 1 shorter than antenna 2 — 5. Peraeopods 3—5, 4th joint and finger normal 4. Gen. Pontogeneia . . p.359 5 | Peraeopods 3—5, 4th joint much dilated, finger with membranous cap .. ....».., 5. Gen. Zaramilla . . . p.361 6 j Antenna 1 longer than antenna 2 ..... 6 Gen. Atyloides . . . p.362 \ Antenna 1 not longer than antenna 2... .. 7. Gen. Paramoera . . p.863 1. Gen. Eurymera Pfeff. 1888 Eurymera (Sp. un.: E. monticulosa), Pfeffer in: Jahrb. Hamburg. Anst., v.5 p. 102. Peraeon dorsally broad. Head not rostrate. Side-plates 1—4 very large, 4" emarginate. Antennae 1 and 2 short; no aecessory flagellum. Upper lip rounded. Lower lip not known. Mandible normal, well deve- loped. Maxilla 1, inner plate with ‘many setae, outer with 9 spines (P), 24 joint of palp broad, with many spines. Maxilla 2, inner plate rather the smaller, strongly fringed ‘on inner margin. Maxillipeds, outer plates not reaching apex of palp’s 29 joint, fringed with spine-teeth on inner and setae on apical margin, palp not very long, finger acute, with setules on inner margin. Gnathopods 1 and 2 feeble, slender, subchelate, 5 and 6" joints nearly equal in length. Peraeopods 1—5, 4 joint not especially dilated, but, especially in 3d—5tk pairs, 4 and 5th joints distally produced; finger seemingly in all short, eurved. Uropods 1—3, outer ramus shorter than inner; uropod 3 seemingly very short. Telson deeply cleft. 1 species. Eurymera, Bovallia 357 1. E. monticulosa Pfeff. 1888 E. m., Pfeffer in: Jahrb. Hamburg. Anst., v,5 p.103 t.1 £.3. Back extremely broad at peraeon segments 4 and 5, hinder part of pleon compressed, peraeon and pleon segments 1—3 with transverse dorsal ridges and longitudinal lateral tubereular elevations. Head, lateral corners weakly convex, defined below by a small sharp ineision, post-antennal eorners strongly produced, obtusely acuminate. Pleon segment 3, postero- lateral corners rounded quadrangular. Eyes small, reniform, very bright. - Antenna 1, 1° joint as long as 24 and 34 combined, flagellum rather longer than peduncle, with about 34 short joints, the alternate distally outdrawn. Antenna 2 subequal to antenna 1, ultimate joint of peduncle shorter than penultimate, both distally outdrawn into several lobes, flagellum a little longer than peduncle, 1° joint as long as the next 3 combined. Mandible. spine-row of about 12 simple spines, 24 joint of palp rather longer than 3%. Maxilla 1, inner plate with more than 20 plumose setae, 24 joint of palp twice the length of 1°, fringed with many setae and spine-teeth. Gmnathopod 1, 5" joint twice as long as broad, subequal to 6%, which widens a little distally, the palm small, defined by an obtuse angle. Gnathopod 2 similar, but 5% joint more than twice as long as broad and 6% not widening distally; finger _ small in both gnathopods. Peraeopods 3—5, 24 joint well expanded, 5th joint (in figure) shorter than 6". Telson not quite twice As long as broad, - triangular oval, cleft for ?/, of length, the lobes not dehiscent, their apices ; rounded. L. 27 mm. South-Atlantie (South Georgia). 2. Gen. Bovallia Pfeff. E 1888 Bovallia (Sp. un.: B. gigantea), Pfeffer in: Jahrb. Hamburg. Anst., v.5 p.9. Some of the segments carinate and elevated. Head, rostrum small. - Side-plates 1—4 very large, not setiferous. Antennae 1 and 2 not elongate, antenna 1 with strong peduncle, no accessory flagellum. Upper lip semi- oval, outdrawn to a little point. Mandible normal, well developed. Maxillal, inner plate with many setae, outer with about 10 spines, 24 joint of palp - with many slender spines. -Maxilla 2, inner plate rather the broader, fringed ; on inner margin. Maxillipeds strongly developed, outer plates closely fringed on inner margin with short spine-teeth, finger of palp acute, almost concealed MR among setae of 34 joint. Gmathopods 1 and 2 similar, moderately large, E ee, 5th joint cup-shaped, 6!" oval, finger strong. Peraeopods 1 and 2 slender. Peraeopods 3—5, 24 joint long oval, laminar, the rest slender. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami equal, elongate, laneeolate. Telson slender, eleft to the middle. 1 species. ıe B. gigantea Pfeff. 1888 B. g., Pfeffer in: Jahrb. Hamburg. Anst., v.5 p-9%6 t.1 £.5. 2 Body thick and rather RN peraeon segments 1—5 dorsally rounded, 6th and 7th and pleon segments 1—3 carinate, each produced to a dorsal Bi tooth, large in the last four, pleon segment 4 with deep dorsal depression. Head, rostrum a small triangular deflexed tooth, lateral eorners quadrate, little produced. Side-plates 1—4 rectangular with corners slightly rounded, 358 Bovallia, Stebbingia 4th much the largest, strongly emarginate. Pleon segment 3, postero-lateral corners subquadrate. Eyes very large, narrowly reniform, with narrow interval at top of head. Antenna 1, 1° joint as long as 24 and 34 combined, strong, 1st and 24 serrately carinate below, 34 serrate, flagellum rather longer than peduncle, joints except 1° small, the alternate distally outdrawn and in Q calceoliferous. Antenna 2 scarcely as long as antenna 1, ultimate joint of peduncle about ?/, as long as penultimate, flagellum as long as peduncle, similar to flagellum of antenna 1. Gmathopod 1, lobe of 5th joint rounded, 6tk rather longer than 5%, broad, palm ill-defined, oblique, convex, finger slender, strongly bent, with dark chitinized point. Gnathopod 2, 6tk joint apparently rather slighter than in gnathopod 1, palm straighter and rather better defined. Peraeopod 5 a little longer than peraeopod 4, considerably longer than peraeopod 3, 24 joint with hind margin straighter than in peraeopods 3 and 4. Colour orange- to purple-red. L. 45 mm. South-Atlantie (South Georgia). 3. Gen. Stebbingia Pfeff. 1888 Stebbingia (Sp. un.: 8. gregaria), Pfeffer in: Jahrb. Hamburg. Anst., v.5 p. 110. Body slender, not carinate or dentate. Head scarcely rostrate. Side- plates 1—4 moderately large. Antenna 1 rather the longer, without accessory flagellum. Lower lip without inner lobes. - Mandible normal. Maxilla 1, inner plate with several (about 9) setae, outer with spines close-set, outer corner of 1° joint of palp somewhat outdrawn. Maxilla 2, inner plate rather shorter and broader than outer. Maxillipeds well developed, outer plates fringed on inner margin with short spine-teeth, finger of palp narrow and rather feeble. Gnathopods 1 and 2 subchelate, similar, but 1° much weaker than 24. Peraeopods 1 and 2 slender; peraeopods 3—5 rather stouter, 24 joint not greatly widened, the lower hind corner narrowly rounded. In uropod 1 outer ramus scarcely, in uropod 2 much, in uropod 3 not, shorter than inner. Telson cleft to the centre. 1 species. 1. S. gregaria Pfeff. 1888 S. g., Pfeffer in: Jahrb. Hamburg. Anst., &.5 p- 110 t.2 £.7 | 1893 Pontogeneia g., A. Della Valle in: F. Fl. Neapel, v.20 p. 904. Head, rostrum obsolete, lateral corners feebly convex. Side-plates 1—3 directed slightly forward, rounded below, 4!" much broader, also rounded below, emarginate behind. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes large, broadly reniform, narrowly separate above. Antenna l, 18t joint rather strong, but not as long as the much narrower 24 and 3% combined, flagellum considerably longer than peduncle, with 56 joints, the proximal ones, except the 1°, shorter than broad, alternate joints distally outdrawn. Antenna 2 shorter, ultimate and penultimate joints of peduncle subequal, flagellum about 46-jointed, alternately calceoliferous. Mandible, spines of the spine- row are described as short, curved, hyaline, and unfeathered, the palp and also maxilla 1 are said to resemble those of Bovallia gigantea (p. 357). Gnatho- pod 1, 5th joint seemingly quadrate, 6b oval, palm moderately oblique, defined by an obtuse angle, finger curved, rather shorter than the palm. Gmnatho- pod 2, 5th joint eup-shaped but not very short, 6% longer, said to be similar in structure to that of gnathopod 1, though very much larger and differently figured, with a much more oblique and less defined palm. Uropods 1—3, / Lam we - TOWER A ” ee Stebbingia, Pontogeneia 359 rami spinulose. Uropod 3, rami equal, lanceolate, acute. Telson about ?/, as broad as long, very little tapering, cleft to the centre, the lobes gradually dehiscent, with truncate notched apices. Colour dull green. L. 17 mm. South-Atlantie (South Georgia). Under stones, at low tide. 4. Gen. Pontogeneia Boeck 1871 Pontogeneia (Sp. un.: P. inermis), A. Boeck in: Forh. Selsk. Christian., 1870 p.193 | 1876 P., A. Boeck, Skand. Arkt. Amphip., v.2 p.334 | 1893 P., G. O.Sars, Crust. Norway, v.1 p.451 | 1895 P. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.615 | 1873 Pontogenia (non Claparede 1868, Polychaeta!), E. v. Martens in: Zool. Ree., v.8 p.190 | 1888 Atylopsis (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 924. Body without dorsal teeth. Head, rostrum small or obsolete, post- antennal corners produced. Side-plates not very large, 4! emarginate. Antennae 1 and 2 in J calceoliferous and longer than in ©, antenna 1 the shorter, without accessory flagellum. Upper lip rounded or slightly emarginate. Lower lip with small inner lobes. Mandible normal, palp strong. Maxilla 1 with about 6 setae on inner plate, 11 spines on outer, 24 joint of palp large. Maxilla 2, inner plate fringed on inner margin. Maxillipeds, outer plates not reaching end of palp’s 24 joint, apically fringed with slender spines, 34 joint of palp produced over base of finger. Gnathopods 1 and 2 similar, feeble, subchelate, palm shorter than hind margin of 6% joint. Peraeo- pods 3—5, 24 joint well expanded, the remaining joints normally slender. Uropod 3, pedunele short. Telson deeply cleft. 8 species accepted, 3 doubtful. Synopsis of accepted species: Gnathopod 2, 5th joint longer than 6th ..... 1. P.inermis . . . p.359 Gnathopod 2, 6th joint longer than 5th — 2. Apices of telson serrate -. -..... 2.2... 2. P. magellanica . p. 360 Apices of telson smooth . . 2»... . Je... 8. 2. dansi . . „x. D.800 1. P. inermis (Kröyer) ?1780 Oniscus abyssinus, O. Fabrieius, Fauna Groenl., p: 261 | 1838 Amphithoe inermis (2) + A. erenulata (3), (Reinhardt in MS.) Kröyer in: Danske Selsk. Afh., v.7 p.275 t.3 f.11la—g; p.278 t.3 f.12a—g | 1862. Atylusi. + A. crenulatus, Bate, Oat. Amphip. Brit. Mus., p.138 t.26 f.5; p.139 t.26 f.6 | 1866 Paramphithoe i., Goes in: Öfv. Ak. Förh., v.22 p.524 | 1874 P. i., Buchholz in: Zweite D. Nordpolarf., v.2 p.366 | 1871 Pontogeneia i., A. Boeck in: Forh. Selsk. Christian., 1870 p.194 | 1876 P.i., A. Boeck, Skand. Arkt. Amphip., v.2 p.385 t.21 f.4 | 1893 P.i., 6.0. Sars, Crust. Norway, v.1 p.451 1.159 | 1893 P.i., A. Della Valle in: F. Fl. Neapel, v.20 p. 617 t.59 f. 2». Back evenly rounded. Head, rostrum very small, lateral corners obtusely rounded, separated by an angular incision from th@ triangular post-antennal lobes. Side-plates 1—3 rounded quadrangular, lower margin minutely erenulate, 4'h considerably larger. Pleon segment 3, postero-lateral corners scarcely produced, lateral margin bulging above abruptly. Eyes oblong reniform, light red. Antenna 1, 1° joint not much longer than 24, 24 twice as long as 34, 34 a little produced at apex, flagellum about twice as long as peduncle, .many-jointed. Antenna 2, ultimate and penultimate joints of peduncle sub- equal, flagellum about twice as long as peduncle. Antennae 1 and 2 in C with large calceoli on confronting edges of ultimate and penultimate joints of peduncle, but none on the long slender flagella. Maxillipeds, outer plates fringed with spines on inner margin. Gnathopods 1 and 2, 5th joint slender, 860 Pontogeneia longer than 6", 6b slightly widening distally, palm somewhat oblique, slightly defined, finger small; 6t% joint rather more widened distally in gnathopod 2 than in gnathopod 1, with the palm rather less oblique and therefore better defined. Peraeopods 3—5, 24 joint rounded oval with hind margin smooth, that of peraeopod 5 much the largest. Uropod 2, outer ramus much shorter than inner; uropod 3, rami subequal, lanceolate, about twice as long as peduncle, fringed with spinules and setae. Telson oblong oval, cleft beyond the middle, lobes rather dehiscent, obtusely pointed. Trans- parent, colourless. L. 9 12 mm, S somewhat less. Arctie Ocean and North-Sea (Greenland, Siberia, West-Norway). 2. P. magellanica (Stebb.) 1888 Atylopsis magellanicus, T. Stebbing i in: Rep. R Voy. Challenger, v.29 p.925 t.79 | 1893 en A. Della Valle in: F. Fl. Neapel, v.20 p. 701. Head angular in front, not rostrate. Side-plate 1 distally widened, 4th much the widest. Pleon segment 3, postero-lateral angles acutely upturned, and lateral margin bulging above a small sinus. Eyes rather large, reniform. - Antenna 1, 1° joint rather longer than 24, remainder, and all but the basal joints of antenna 2, unknown. Upper lip slightly emarginate, so as to be unequally bilobed. Maxillipeds, outer plates fringed with submarginal spinules. Mouth-parts otherwise agreeing well with P. inermis (p. 359). Gnathopod 1, 5th joint as long as 6, 6 more than twice as long as broad, palın only slightly oblique, defined by a group of spines at the obtuse angle, finger small, curved, denticulate on inner margin. Gmnathopod 2 rather similar but longer, 5th joint not so long as 6th, which is rather widened distally. Peraeopods 3—5 nearly as in P.inermis, but hind margin of 29 joint slightly serrate. Uropod 3, peduncle shorter than one of the rami, the other ramus unknown. Telson not longer than peduncle of uropod 3, not much longer than broad, cleft for about °/, of length, lobes a little dehiscent near the broad apices, which form 3 denticles on their slope from the lateral margins. L. about 7 mm. Strait of Magellan (Cape Virgins). Depth 100 m. 3. P. danai (G. M. Thoms.) 1879 Atylus dania, A. danai, G. M. Thomson in: Tr. N. Zealand Inst., v. 11 p.238, 248 t.10 f.C 1 | 1879 A. danai, G. M. Thomson in: Ann. nat. Hist., ser.5.v.4 p.330 | 1898 A. d., A. Della Valle in: F. Fl. Neapel, v.20 p. 708. Head with short rostrum, post-antennal corners blunt, little produced. Eyes large, round, black. Antenna 1. about ’/, shorter than antenna 2, joints of peduncle short, dentate on lower margin, flagellum with more than 25 joints, every 39 or 4% produced to a setose tuberele. Antenna 2, ultimate and penultimate joints of pedunele rather short, equal, flagellum 40 —50-jointed. Side-plates, mouth-parts and peraeopods apparently in very close agreement with those of P. magellanica, and gnathopods 1 and 2 not very. different, but with palm imperfectly defined and finger smooth. Also gnathopod 1, at least in Q, has the 6!" joint larger and more ovate than that of gnatho- pod 2. Uropods 1 and 2, peduncle longer than rami, outer ramus shorter than inner. Uropod 3, rami about twice as long as peduncle, thickly studded with short spines and fringed with long cilia, probably in both sexes, certainly in 9. Telson cleft to nearly half its length, apices rounded, smooth, with a spinule somewhat remote from them on each side. Colour semi-transparent, with dark bluish spots. L. 7°5 mm. South-Paeifie (Dunedin [New Zealand]. Rock pools. 561 Pontogeneia, Zaramilla BE . P. eapensis (Dana) 1853 &,55 Iphimedia e., J.D. Dans in: U. $. expl. Exp., 130 p.981t.63 f.5a—g | 1862 Atylus c., Bate, Cat. Amphip. Brit. Mus., p.141 1.27 £.4. u: Possibly identical with P. magellanica. L. 8 mm. = Near to Cape of Good Hope. e - P. fissieauda (Dana) 1852 Amphithoe f., J. D. Dana in: P. Amer. Ac., v2 p.21l4 | 1853 & 55 Iphimedia f., J.D. Dana in: U. S. expl. Exp., v. 13m p.929 t.68 f.4 | 1862 Atylus f., Bate, Cat. Amphip. Brit. Mus., p. 141 t.27 £.3. South-Paeifie (north of Valparaiso). P. tasmaniae (G. M. Thoms.) 1893 Atyloides t., G. M. Thomson in: P. R. Soc. Tasmania, 1892 p.21 1.2 £.9—15; t.3 f. 1,2. E L. 7 mm. Pirates Bay [Tasmania]. Rock pools. 5. Gen. Zaramilla Stebb. | 1888 Zaramilla (Sp. un.: Z. kergueleni), T. Stebbing in: Rep. Voy. Challenger, ©.29 p.866 | 1890 Zaramella, Beddard in: Zool. Rec., v.25 Index p. 17. Back round, not dentate. Head not rostrate. Side-plates 1—4 not very large, setiferous. Antennae 1 and 2 short; no accessory flagellum. Upper lip rounded. Lower lip, inner lobes not sharply separated from outer. Mandible normal, well developed. Maxilla 1, inner plate with many setae, outer with 9 spines, 24 joint of palp large. Maxilla 2, inner plate rather the smaller, strongly fringed on inner margin. Maxillipeds, outer plates not nearly reaching apex of palp’s 29 joint, fringed with spine-teeth on inner margin and setae on apical, finger slender, with a sharp nail. Gnathopods 1 and 2 feeble, slender, subchelate, 5! and 6t% joints nearly equal in length. Peraeopods 1—5 setose, 4" joint long, dilated, especially in 39 —5{h pairs, finger very short in 1° and 24, long in 34—5th, in all with a membranous cap over the nail. Uropod 3, rami subequal, lanceolate. Telson not long, deeply cleft. l species. TNEREN 1. Z. kergueleni Stebb. 1888 Z. k., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.867 t. 66. .. E Head, lateral corners rounded, little produced. Side-plates 1—4 rounded - below; 4" much wider than 1°, 2X or 3%, emarginate above. Pleon segment 3, - _ postero-lateral corners quadrate. Eyes large, nearly meeting at top of head, = oval, dark. Antenna 1, 24 joint a little shorter than 1°, and 34 than 24, flagellum as long as pedunele, with 12 joints, some in G with caleceoli. 3 Antenna 2 a little longer, ultimate joint of peduncle sligehtly longer than - penultimate, flagellum subequal to pedunele, with 14 unequal joints, the longer ; more expanded distally and in G with ealceoli. Mandibles, on the left both plates strongly dentate, on the right accessory plate denticulate; spine-row, L molar and palp strongly developed. Gmathopod 1, 5th joint in the Cd a 2 little shorter, in the © a little longer than the 6; 6th oblong oval, palm = oblique, erenulate, defined by a group of spines, finger not long. Gnatho- 3 pod 2, 5tk joint in J considerably, in © a little, shorter than 6*h, otherwise = nearly as in gnathopod 1. Peraeopods 1 and 2, 4tk joint broader and much 3 e S Re Fi longer than 5tk, 5th broader and a little longer than 6%, Peraeopods 3—5, 24 joint broadly oval, hind margin serrulate, 4 subequal in length to 24, 362 Zaramilla, Atyloides much broader than 5t%, somewhat decurrent behind, 5tk Jonger and much broader than 6%, which is subequal to the tapering, minutely pectinate finger. Uropod 1, rami equal, rather shorter than peduncle; uropod 2 shorter and stouter, outer ramus shorter than inner; uropod 3, peduncle much shorter than rami, outer ramus more slender, scarcely shorter than inner, both spinulose. Telson once and a half as long as broad, cleft ®/, of length, with 3 pairs of dorsal spinules, apices acute, slightly divergent. L. O0 9 mm. Southern Indian Ocean (Kerguelen Island). At the surface. 6. Gen. Atyloides Stebb. 1888 Atyloides (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 913. Body not carinate or dentate. Side-plates I—4 rather deep, 4! emarginate behind. Antenna 1 longer than antenna 2, with 1-jointed accessory flagellum. Upper lip rounded, lower lip without inner lobes. Mandible normal, 34 joint of palp distally widened, not as long as 24. Maxilla 1, inner plate with many setae, outer with 11 spines, 24 joint of palp with many spine-teeth. Maxilla 2, inner plate fringed on inner margin. Maxillipeds, inner plates rather long, outer not reaching end of palp’s 24 joint, fringed with spine- teeth on inner margin. Gnathopods 1 and 2 slender, unequal, 5" joint elongate, 6% joint with parallel margins and very short palm. Peraeopods 3—5, 24 joint oval. Branchial vesicles simple. Uropods 1 and 2, outer ramus rather shorter than inner; uropod 3, rami lanceolate, subequal. Telson deeply cleft. 1 species. 1. A. serraticauda Stebb. 1888 A.s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.920 1.78 | 1895 Atylus s., A. Della Valle in: F. Fl. Neapel, v.20 p. 702. Body with downy surface. Head, rostral projection minute, lateral margins subtruncate, post-antennal corners not produced. Side-plate 5, hind lobe scarcely deeper than front. Pleon segment 3, postero-lateral corners bidentate, the upper tooth the larger. Eyes large, reniform, nearly meeting at top of head, retaining colour in spirit. Antenna 1 of ?/, length of body, 1° joint longer than 24 and 34 combined, 24 twice as long as 34, flagellum 5 times as long as peduncle, with more than 62 joints. Antenna 2 much shorter, ultimate joint of peduncle a little longer than penultimate, flagellum more than twice as long as peduncle, with 34 joints, 1° longest. Gnathopod 1, 5tk Joint much longer than 6%, both fringed with varied spines, 6!" joint about thrice as long as broad, palm convex, slightly oblique, finger not reaching beyond it. Gnathopod 2 similar, but much longer, 5!" and 6!" joints equal, 6 5 times as long as broad. Peraeopods 1 and 2, 4 and ‚stk joints equal, rather longer than 5t", all spinose, finger short, curved. Marsupial plates very large in gnathopod 2 and peraeopod 1, smaller in peraeopod 2, ‚and small in peraeopod 3. Peraeopods 3—5, 4" joint rather produced behind. Uropod 3, rami about once and a half as long as peduncle, serrate on inner margin, with spines on both margins, apices acute, inner ramus with pectinate inner margin. Telson longer than peduncle of uropod 3, longer than broad» only slightly tapering, cleft ®/, of length, the broad inward-sloping apices each cut into 5 teeth. L. about 8 mm. Port Phillip (Melbourne [southern Australia]). Depth 60 m. E = 2 4 E; B F E 3 Mi: Ri; z | E E Paramoera 363 7. Gen. Paramoera Miers 1875 Paramoera (part.), Miers in: Ann. nat. Hist., ser. 4 v.16 p.75 | 1882 Para- mera, (Miers in:) Scudder, Nomenel. zool., suppl. L. p.247 | 1888 Atyloides (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 913. Body not carinate or dentate. Pleon segments 5 and 6 not coalesced. Side-plates I—4 of moderate size, 4 emarginate behind, 5th with hind lobe the deeper. Antenna 1 not longer than antenna 2, with 1-jointed accessory flagellum. Upper lip rounded. Mandible normal, but 34 joint of palp as long as 24. Maxilla 1, inner plate with many setae, outer with 11 strong dentieulate spines, 24 joint of palp with many spine- teeth. Maxilla 2, inner plate fringed on inner margin. Maxillipeds, inner plates rather large, outer not reaching apex of palp’s 24 joint, fringed on inner margin with spine-teeth. Gnathopods 1 and 2, 5tk joint shorter than 6th, especially in S, 6tk joint oblong, much wider in J than in oO, palm not very oblique, well defined. Peraeopods 1—5, 5tk joint shorter than 6tk, finger small. Branchial vesicles simple. Uropods 1 and 2, outer ramus the shorter; uropod 3, rami long, lanceolate, subequal, reaching back as far as the 1%. Telson deeply cleft. l species accepted. 1 obscure. 1. P. austrina (Bate) 1862 Atylus austrinus, Bate, Cat. Amphip. Brit. Mus., 2.137 t.26 f.4 | 1893 A.a., A. Della Valle in: F. Fl. Neapel, v.20 p.702 | 1875 Para- moera australis, Miers in: Ann. nat. Hist., ser. 4 v.16 p.75 | 1875 Atylus a., Miers in: Ann. nat. Hist., ser.4 v.16 p.117 | 1879 A.a., Miers in: Phil. Tr., v. 168 p. 208 t.11 £.5,5a—g | 1880 A. megalophthalmus, Haswell in: P. Linn. Soc. N.S. Wales, v.5 p. 102 t.6 f.4 | ?1885 A. m., Chilton in: P. Linn. Soc. N.S. Wales, v.9 p. 1037 | 1888 Atyloides australis + A. assimilis, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 914 t. 75, 76; p- 918 t. 77. Body rather compressed. Head, rostrum obsolete (Chilton: about */, as long as 1° joint of antenna 1), lateral margins inconspicuously bilobed, post-antennal corners not produced. Pleon segment 3, postero-lateral corners rounded, segments 1—3 dorsaily microscopically scabrous. Eyes rather large, reniform, black. Antenna 1, 1% joint as long as 24 and 34 combined, flagellum tapering, with 16—55 joints, alternate joints widening at apex, accessory flagellum (Miers: not existing) consisting of 1 joint shorter than 1°t of primary, tipped with 2 setae. Antenna 2 scarcely longer (length variable, Haswell), ultimate and penultimate joints of peduncle subequal, flagellum 20—56- jointed. Gnathopods 1 and 2, 5tk joint in young and © not greatly shorter than the narrowly oblong 6%, in the d much shorter, while the 6% joint is much wider; both these joints in gnathopod 2 are longer than in gnathopod 1, without being wider; the palm is_short, slightly oblique, well defined by palmar spines. Peraeopods 3—5, 24 joint oval, widest on the last pair. Uropod 3, rami more than twice as long as peduncle, acute, with spines on each margin. Telson longer than peduncle of uropod 3, about ?/, as broad as long, cleft °/, of length, tapering, with a spinule in each bidentate apex (Chilton: oblong, eleft about to middle, apices rounded on outer margin). L. reaching 17 mm. : Southern Indian Ocean (Kerguelen Island, rocky beaches and surface to 45 m; Cape Agulhas, from screw of Challenger); South-Paeifie (Sydney, Port Jackson). P.simplex (Dana) 1852 Amphitoe (Iphimedia) s., J. D. Dana in: P. Amer. Ac., v.2 p.217 | 1893 A.(I.) s., A. Della Valle in: F. Fl. Neapel, v.20 p.585 | 1853 & 55 364 Paramoera, Gammaridae I. s., J. D. Dana in: U. S. expl. Exp., v.13u p.927 t.63 f.2a—i | 1862 Atylus s., Bate, Cat. Amphip. Brit. Mus., p.140 t.27 f.2 | 1880 A. microdeuteropus, Haswell in: P. Linn, Soe, N.S. Wales, v.5 p.102 t.6 £.2. Substantially agreeing and probably identieal with P. austrina.. L. 6—10 mm. South-Atlantie (Hermit Island); South-Pacific (Port Jackson, Botany Bay). 30. Fam. Gammaridae 1813/14 Gammaridae (part.), Leach in: Edinb. Ene., v.7 p.432 | 1882 @., 6. O. Sars in: Forh. Selsk. Christian., nr. 18 p.28 | 1888 @., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1004 | 1894 G@., G. ©. Sars, Crust. Norway, v.1 p.481 | 1871 & 76 Subfam. Gammarinae, A. Boeck, Skand. Arkt. Amphip., e.1 p.74; 0.2 p.362 | 1874 „Gammariden“, B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.6 | 1893 Gammaridi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 620. Body (Fig. 84, 85, 89) more or less slender, pleon segments 4—6 usually well defined. Antennae (Fig. 86) generally rather slender, and, as a rule, but little different in the two sexes; accessory flagellum of antenna 1, often greatly developed, may dwindle sometimes to a single joint or tuberele, or disappear entirely. Mouth-parts (Fig. 87, 88) normal. Upper lip with a rounded, entire or only slightly emarginate distal border; lower lip with inner lobes well developed, slightly indicated, or absent. Mandible with dentate cutting. edge and accessory plate, spine-row, molar, and 3-jointed palp (only in one genus 24 joint smaller than 1%). Maxilla 1 with inner and outer plate and 2-jointed palp (only exceptionally 1° joint as large as 24). Maxillipeds with inner and outer plates and palp well developed. Gnatho- pods 1 and 2 generally rather powerful, rarely less than subchelate, seldom both weak; sometimes stronger and larger in J than in ©. Peraeopods more or less slender, sometimes stout, sometimes 24 joint in peraeo- pods 3—5 little expanded. Pleopods lose only by exception one ramus and uropod 3 one or both of the rami. Uropod 3, rami more or less foliaceous, projeeting beyond uropods 1 and 2; uropod 3 and telson never hooked. Telson (Fig. 89 p. 481) either with entire margin or cleft to the base, sometimes strikingly different in the two sexes. The greater part of the family lives in fresh and brackish water of seas, lakes, rivers; also in wells and other subterranean waters; rarely in the ocean. Cosmopolitan. 52 genera, 243 accepted and 48 doubtful species. Synopsis of genera: Pleon (Fig. 84), segments 4—6 coa- lesceed — 2. A Pleon (Fig. 85), segments 4—6 not coalesceed — 8, 0 | Eyes wanting, body pellucid . .. . 1. Gen. Boruta . ....... p. 867 Eyes present, body not pellueid. . . 2. Gen. Synurella. ...... p- 368 j Pleopods with a single ramus. . . . 3. Gen. Paracrangonyx . . . . p.369 \ Pleopods with two rami — 4. 4 f Uropod 3 without rami »..... 4. Gen. Apoerangonyx . . . . p.370 \ Uropod 3 not without rami — 5. f Uropod 3 with a single ramus — 6. \ Uropod 3 with two rami — 7. - Gammaridae Re, 5 long, 2d joint moderately ” N ee 6 Peraeopod 5 short, 24 st greatly ee Telson sometimes entire, sometimes emarginate or cleft....... Telson entire, with or without emar- gination — 8. Telson eleft — 15. Telson not emarginate — 9. ie Telson emarginate — 11. Uropod 3, rami long Uropod 3, rami short — 10. Antenna |], accessory flagellum short © 10 Antenna 1, aeccessory flagellum long Uropod 3, innerramuslonger than outer 11 2 Uropod 3, inner ramus shorter than AR outer -— 12. ee 19 Uropod 3, inner ramus well developed FR Uropod 3, inner ramus very short — 18. E 2 13 Body RE ge = Body with dorsal carina — 14. E 14 Peraeopods 3—5 rather short . Peraeopods 3—5 very long Antenna 1 without accessory flagellum Antenna 1, accessory flagellum 1- or 2- jointed — I. Antenna 1, accessory flagellum of more than 2 joints — 29. Maxilla 1, 2d joint of palp not longer 17 than Ist EI ET ee Maxilla 1, 24 joint of palp longer than. st — 18. Uropod 3 short — 19. Uropod 3 well developed — 20. Body more or less carinate. .. . . Body not carinate jr 19 Uropod 3, outer ramus much longer than inner — 21. Uropod 3, outer ramus not much longer than inner — 285. Uropod 3, outer ramus 1-jointed . . Uropod 3, outer ramus 2-jointed — 22. "Maxilla 1, inner plate with few setae . Maxilla 1, inner plate with many setae — 23. Uropod 3, PL joint of outer ramus N ae | RN | | | # | | = es : { { | | di Uropod 3, 2d joint of outer ramus very short — 24. 5 4 Antenna 1 with accessory flagellum — 16. 5. 6. 7: 8. 9. 10. iH, 12. 13. 14. 15. 16. 17. Gen. 18. 19. 20. 21. 22. Gen. Gen. Gen. Gen. 7 Gen. Gen. Gen. Gen. Gen. Gen. .Gen. Gen. Gen. Gen. Gen. Gen. Gen. PERS IT st A, Bone | Amathillopsis Gammarellus Euerangonyx Axelboeckia Braehyuropus . . .. Macrohectopus. . . . Miceruropus Neoniphargus . . - . a a ET Ar p. 395 p. 395 p. 398 je 866 Gammaridae _ Gnathopods 1 and 2 subequal . . . 23. Gen. Gmelina. ...... p.412 Gnathopod 1 much stronger than gna- ER . . 24. Gen. Gmelinopsis . . . . . p.414 Gnathopod 2 not larger than gna- thopod 1 — 26. Gnathopod 2 larger than gnatho- pod 1 — 27. Uropod 3, peduncle shorter than outer (I-jointed?) N Re . 25. Gen. Hakonboeckia - . . . p.415 Uropod 3, peduncle as long as outer (2-jointed) ramus . ». »....». 26. Gen. Baikalogammarus . . p.416 Mandible, 2d joint of palp shorter RE EN En SR 27. Gen. Parelasmopus . . . . p.417 Mandible, 2d joint of palp Gone than 1st — 28, Uropod 3, rami narrowly lanceolate . 28. Gen. Cheirocratus. . . . . p. 417 Uropod 3, rami laminar, apically zöunded EEE RR RER . 29. Gen. Megaluropus. . .. . p- 420 24 27 28 Body notatallorscarcely carinate — 30. Body distinetly carinate — 46. Body without groups of dorsal spi- nules — 31. Body with groups of dorsalspinules— 40. Uropod 3 large — 32. Uropod 3 not large — 36. Uropod 3, rami very unequal . . . . 30. Gen. Melita. ....... p-. 421 Uropod 3, rami not very unequal — 38. | M| "| | | | Antenna 2 stout. 2». =... 31. Gen. Paraceradocus . . . . p.429 “| | | \ ii 30 3l 32 33 Antenna 2 slender — 34. Maxillae 1 and 2 with inner plate very BROWSEN EL en ea 32. Gen. Ceradocus . . ... . p- 430 Maxillae 1 and 2 with inner plate not very setose — 835. Peraeopods 83—5 slender ...... 38. Gen, Massa... 2 p. 483 Peraeopods 8—5 robust . ... .» . 84. Gen. Elasmopus. .... . p- 441 Uropod 3, rami equal ....... 85. Gen. Plesiogammarus . . . p.446 Uropod 3, rami unequal — 37. Peraeopods 1—5, 6th joint apically RER ee ER 36. Gen. Iphigenella .... . p- 447 Peraeopods 1—5, 6th joint not apically widened — 838. Lower lip without inner lobes . . . 87. Gen. Pandoritesı .... . p. 448 Lower lip with inner lobes — 39. Antenna 1 long, with long peduncle 38. Gen. Pherusa . . ... . .p.449 Antenna 1 short, with short pedunele 39. Gen. Niphargoides . . . . p.450 Without eyes . . . ."2 2.2.2... 40. Gen. Phreatogammarus . . p.453 With eyes — 41. Eyes (Fig. 86) of irregular form. . . 41. Gen. Ommatogammarus . . p.454 Eyes of regular form — 42. : Side-plate 5 dentately produced . . 42. Gen. Odontogammarus . . p.456 Side-plated5 not dentatelyproduced — 48. Pleon segments 4 and 5 each raised ; { dorsally to a spiniferous tuberele 43. Gen. Dikerogammarus. . . p.458 Pleon segments 4 and 5 not raised dorsally to aspiniferoustuberele — 44. 35 86 39 40 41 42 Groups of dorsal Elias limited to | pleon age De U 44 44 & 47. Groups of dorsal spinules (Fig. 89) | not mn. to pleon segments 4—6 — Antenna 1, a longer than pe- "4 duncle of antenna 2 ...... 45. Antenna 1, pedunele shorter than pe- ERS BETTER a N . 46. Pleon segments 1—3 without median 46 N a er en Er ER IET 48. Pleon segments 1—3 with median earina — 47. Body with median carina only — 48. 47 & Body with aan and lateral ca- rinae — Peraeopod m 2d joint with broad 48 iower hind bobe . . 2... .. 49 Peraeopod 5, 2d joint without broad lower Rind Iobe . . . .. . ... 50 Ta EN 51 u { N 4 Re ee a 52 Gammaridae, Boruta . Gen. Gen. Gen. Gen. Gen. . Gen. . Gen. . Gen. . Gen. 567 Gammarus. ..... p. 460 Heterogammarus*). . p.494 Poekilogammarus . . p. 477 Echinogammarus. . . p.479 Parapallasea. ... . p- 497 Amathillina ..... p- 499 Carinogammarus. . . p.501 Gammaracanthus - pP. 507 Acanthogammarus . . p.508 1. Gen. Boruta Wrzesn. 1888 Boruta (Sp. un.: 1896 COrangonyx, Vejdovsky in: SB. Böhm. Ges., nr. 10 p.5. Close to Synurella (p. 368). Pleon segments 4—6 coalesced (Fig. 84). E: Eyes wanting. Lower lip without inner lobes. Fig. 84. B. tenebrarum, 2. Lateral view. [After Wrzesniowski.] B. tenebrarum), Wrzesniowski in: Pam. Fizyjogr., v. 8 9.264 | 1888 B., T.Stebbing in: Rep. Voy. Challenger, v.29 p.1656 | 1890 B., Wrzesniowski in: Z. wiss. Zool., v.50 p.639 | 1893 B., A. Della Valle in: F. Fl. Neapel, v.20 p. 647 | Mandible, molar with a very u --- Pleonsegments4—6. BBOre apically truncate seta. Maxilla 1, inner plate with 7 setae, outer - with 7 spines, which are apically broad and pectinate, 24 joint of palp carrying curved setae on both the right and left maxilla. on outer plates than in Synurella. l species. Maxillipeds with more setae Telson emarginate, not cleft. *) For the differences of these two genera see p. 494. 368 Boruta, Synurella 1. B. tenebrarum Wrzesn. 1888 B. t., Wrzesniowski in: Pam. Fizyjogr., v.8 (p.72) t.9—16 ; 1888 B. t., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1656 | 1890 B.t., Wrzesniowski in: Z. wiss. Zool., v.50 p.677 t.28 £.6.7, 9,13, 15, 16; 1.29 f. 4-6; t.30 f.1, 2,4,6,15; t.31 £.1, 2,4, 6-13, 15—17; 1.82 f.2--7,9 | 1898 B.t., A. Della Valle in: F. Fl. Neapel, v.20 p. 647. Body moderately elongate, pleon segments carıying a few dorsal setules. Head, front corners rather prominent, truncate. Side-plate 4 the largest, emarginate. Pleon segments 1—3 (Fig. 84), postero-lateral corners quadrate (figure), sharply pointed (text). Antenna 1 athird of length of body or a little more, 1° joint of peduncle subequal to 24 and 34 combined, flagellum once and a half as long as pedunele, 12- or 13-jointed, accessory flagellum 2- Jointed, shorter than first 2 joints of primary. Antenna 2 much shorter, ultimate joint of peduncle shorter than penultimate, flagellum not equal these 2 combined, 5-or 6-jointed. Mandible, 24 and 34 joints of palp subequal. Gnathopod 1, 5th joint little longer than broad, 6" once and a half as long as broad, palm almost straight, scarcely oblique. Gnathopod 2, 5" and 6!" joints longer than in gnathopod 1, especially in O, with palm more oblique; finger in both gnathopods acute, curved, smooth on concave margin. Peraeopod 4 the longest. Peraeo- pods 3—5, 24 joint broadly oval, with serrate margins. Uropod 1, peduncle rather longer than rami. Uropod 2, pedunele subequal to rami. Uropod 3 subequalto peduncle of uropod 2, ramus betweenhalf and athirdas long aspeduncle, tipped with a spine. Telson rather longer than broad, emarginate less than !/), of length, the broad apices each armed with 4 spines. Branchial vesicles attached to gnathopod 2 and peraeopods 1—5 by a narrow stalk-like beginning. On peraeon segments 2, 3, 6 and 7 and between 1° pair of pleopod 1 there are pairs of tube-like sacs (accessory branchiae), close together on peraeon segments 7 and 8 and pleon segment 1, but wide apart and close to the side-plates on peraeon segments 6 and 7, these latter being the largest. Marsupial plates very large. Colour pellucid. L. © over 7, © under 4 mm. Northern slopes of Tatry mountains. In wells. 2. Gen. Synurella Wrzesn. 1877 Synurella (Sp. un.: $. polonica), (Wrzesniowski in:) Hoyer in: Z. wiss. Zool., v.28 p.403 | 1879 Goplana, Wrzesniowski in: Zool. Anz., v.2 p.299 | 1888 @., T. Stebbing in: Rep. Voy. Challenger, v.29 p.472, 501 | 1890 @., Wrzesniowski in: Z. wiss. Zool., v.50 p. 635 | 1890 G., Wrzesniowski in: Biol. Oentralbl., v.10 p.151 | 1893. @., A. Della Valle in: F. Fl. Neapel, v.20 p. 645. Pleon segments 4—6 coalesced. Side-plates 1—4 much deeper than the following. Eyes with few elements. Antenna 1 the longer, accessory flagellum 2-jointed. Antenna 2, flagellum in J calceoliferous. Lower lip with inner lobes. Mandible normal, molar with a long plumose seta. Maxilla 1, inner plate with several (7) setae, outer with 7 spines, some furcate, some serrulate, 24 joint of palp carrying spines and setae. Maxilla 2 with few setae’ on inner margin of inner plate. Maxillipeds, outer plates with few setae, palp long. Gmnathopods 1 and 2 similar, subchelate, 6! joint little dilated. Uropod 3 with a single conical ramus. Telson emarginate or. cleft. 2 species. Synopsis of species: Toon tt ZEN ng 1.8, ambaulans : . ....... p- 369 Telson emarginate . ..2.....n 2... 2:8, DORREROR 2 p- 869 Synurella, Paraerangonyx 369 1. S. ambulans (Fr. Müll.) 1846 Gammarus a., Friedr. Müller in: Arch. Naturg., v.121 p. 296 t.10 f. A—C | 1872 Crangonyx 4., r% Boeck, Skand. Arkt. Amphip., v.1 p.52 | 1879 Goplana a., Wrzesniowski in: "Zool. Anz., v.2 p.302 | 1888 @. 4, — —-T.Stebbing in: Rep. Voy. Challenger, v.29 p. 217, 502 | 1893 @.a., A. Della Valle in: —_F. Fl. Neapel, v.20 p. 644. Close to S. polonica, perhaps identical with it. Back smooth. Head without rostrum. Eyes tending to round. Antenna 1, the 2-jointed accessory flagellum very small. Uropod 3 very small. Telson cleft(?), appendages short, eylindrical, spinulose at apex. L. about 45 mm. Near Greifswald, and near Berlin. 2. S. polonica Wrzesn. 1877 8.p., (Wrzesniowski in:) H. Hoyer in: Z. wiss. Zool., v.28 p.403 | 1879 Goplana p., Wrzesniowski in: Zool. Anz., v.2 p.300 | 1888 @.p., T.Stebbing in: Rep. Voy. Challenger, v.29 p. 472, 501, 503 | 1890 @. p., Wrzesniowski in: Z. wiss. Zool., 0.50 p.639; 1.28 £.13; 1.30 f.5, 14; t.31 f.3 | 1893 @. p., A. Della Valle in: F. Fl. Neapel, v.20 p. 646. Body rather stout, back broad, rounded. Head, front corners very prominent. Eyes of moderate size, deep brown black, pigment somewhat irregularly distributed, erystalline cones few. Uropod 3, peduncle broad, the single ramus very short, with 1 spine at the apex. Telson apically emarginate. ‘In both sexes gnathopod 2 and peraeopod 1 have a pair of eylindrieal accessory branchiae on the front rim of fleshy part of side-plates, 5 = and to peraeopods 4 and 5 and to the front rim of pleon segment 1 similar but simple accessory branchiae are attached. In the S from gnathopod 2 to peraeopod 5 there are lamellar appendages homologous in situation and structure to the marsupial plates of the O0. Colour, © green, Q brownish- yellow, both with an irregular patch of lemon-yellow on top of the head. L. © 65 mm, © smaller. Warsaw.: In weedy ditch. 3; Gen. Paracrangonyx Stebb. 1899 Paracrangony& (Sp. typ.: P. compactus), T. Stebbing in: Tr. Linn. Soc, London, ser.2 v.7 p. 422. Side-plates 1—4 shallow, not deeper than the rest. Eyes rudimentary. Antenna 1 longer than antenna 2, accessory flagellum small. Upper lip faintly emarginate. Lower lip with small inner lobes. Mandible, molar small, 34 joint of palp subequal to 24. Maxilla 1, inner plate with 2 setae, outer with. 7 spines, palp 2-jointed. Maxilla 2, outer plate rather longer and broader than inner. Maxillipeds, outer plates short, palp large. Gnatho- pods 1 and 2 subchelate, 6!" joint oval, palm oblique. Peraeopods 1 and 2, 24 joint narrowly ovate. Peraeopods 3—5, 24 joint narrowly oblong. Pleo- .pods 1—3 slight, 1-branched. Uropods 1—3 short, biramous. Uropod 3 with inner ramus very small. Telson entire. 1 species. 1. P. compactus (Chilton) 1882 Crangonyx c., Chilton in: N. Zealand J. Sei., v.1 p.44 | 1893 C©.c., A. Della Valle in: F. Fl. Neapel, v.20 p.682 t.60 f.14 | 1894 C. c., Chilton in: Tr. Linn. Soe. London, ser.2 v.6 p.220 t.20 | 1899 Paracran- gony& c., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.422. Pleon rather deep, segments 1—3 not much longer than those of peraeon. Head not rostrate, lateral corners rounded. Pleon segment 3, Das Tierreich. 21. Lief. T.R.R. Stebbing, Amphipoda I. 24 370 Paracrangonyx, Apocrangonyx, Crangonyx postero-lateral corners subquadrate. Eyes represented by 2 or 3 imperfeect lenses without pigment. Antenna 1, 1° joint longer than 24, 24 once and a half as long as34, flagellum rather longer than pedunele, 13-jointed, accessory flagellum with 2 joints, 24 minute. Antenna 2, ultimate and penultimate joints of pedunele equal, flagellum shorter than either, 5-jointed. Gmnathopod 1, 5th joint short, cup-shaped, 6tk twice as long, palm about as long as hind margin, defined by spines, finger closely fitting it. Gmathopod 2 similar, but 5tk joint much longer and 6tk slightly shorter, with shorter and better defined palm. Peraeopods 1—5, finger short. Pleopods well armed with coupling-spines, the slender single ramus without cleft spines, such as are commonly found on 1° joint of inner ramus. Pleopod 1, ramus with 11 joints, pleopod 2 with 6, pleopod 3 with 3. Uropod 1, pedunele longer than the faleiform rami, outer ramus rather the shorter. Uropod 2, peduncle little longer than the subequal rami. Uropod 3, peduncle short, outer ramus thrice as long, with small 24 joint, inner ramus rudimentary. Telson oblong ovate, with spinule at each corner of the broad apex. Colour white, semi-transparent. L. about 8 mm. New Zealand (from pump at Eyreton, from Leeston, and from wells at Canterbury). 4. Gen. Apocrangonyx Stebb. 1899 Apocrangonyx (Sp. typ.: A. lucifugus), T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.422. Eyes wanting. Antenna 1 longer than antenna 2, accessory flagellum small. Gnathopod 2 stouter than gnathopod 1. Peraeopods stout. Uropod 3 rudimentary, without rami. Telson entire. 1 species. 1. A. lueifugus (0. P. Hay) 1882 Crangonys l., OÖ. P.Hay in: Amer. Natural., v.16 p.144 | 1893 0. 1., A. Della Valle in: F. Fl. Neapel, v.20 p.682 | 1894 C.1., Chilton in: Tr. Linn. Soc. London, ser.2 v.6 p.219 | 1899 Apocrangonyz l., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.422, 5. Pleon segment 3, postero-lateral corners subquadrate. Antenna 1 scarcely half as long as body, 24 joint ?/, as long as 1°, 34 joint ®/, as long as 24, flagellum 14-jointed, accessory flagellum 2-jointed. Antenna 2, half as long as antenna 1, ultimate and penultimate joints of peduncle long, together longer than flagellum, which is about 5-jointed. Gnathopod 1, 6% joint quadrate, palm smooth-edged, fringed with spines. Gnathopod 2, 6! joint ovate, edge of palm uneven. Peraeopods 4 and 5 the longest, subequal. Uropod 1, rami equal, shorter than pedunele. Uropod 2, outer ramus nearly as long as pedunele, inner nearly twice as long as outer. Uropod 3 consisting of a single joint which is rather longer than the telson, broadly ovate, ”/, as broad as long, with 2 short spines at apex. Telson a little longer than wide, narrowing a little to the truncate apex, which has 2 stout spines at each corner. Colour pale. L. reaching 6 mm. — In 9 gnathopod 2 has the palmar margin less oblique. Illinois (well in Abingdon). 5. Gen. Crangonyx Bate 1859 Crangonyx (Sp. un.: C. subterraneus), Bate in: P. Dublin Univ. zool. bot. Ass., v.1 p.237 | 1890 C., Wrzesniowski in: Z. wiss. Zool., v.50 p. 634, 697 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p.681 | 1894 C., Chilton in: Tr. Linn. Soc. London, ser.2 v.6 p.218 | 1896 C©., Vejdovsky in: SB. Böhm. Ges., nr.10 p.5 | 1872 Stygobromus (Sp. un.: 8. vitreus), E.D. Cope in: Amer. Natural., ©.6 p.422 | 1875 Stygodromus, E. v. Martens in: Zool. Ree., v.10 p. 189. Crangonyx 371 Body eompressed, not carinate. Side-plates 1—4 deeper than the following. Eyes present or absent. Antenna 1 the longer, accessory flagellum small, 2-jointed. Mouth-parts imperfectly known, probably near to those of Niphargus (p. 405), but (in C. flagellatus) lower lip with very small inner lobes, maxilla 1, inner plate with 6 setae, maxilla 2, inner plate he fringed on inner margin, maxillipeds, outer plates narrow. Gnathopods 1 and 2 subchelate, 6" joint not ee broader than 5tt. Peraeopods 3—5, 24 joint moderately expanded. Uropod 3 not elongate, with single 1-jointed ramus. Telson entire or partly cleft. \ 6 accepted species, 1 doubtful. Synopsis of accepted species: Uropod 8, peduncle shorter than ramus. . . . . 1. C. subterraneus . p. 371 I | Uropod 3, peduncle longer than ramus — 2. Telson not eleft — 3. 3 ! Telson more or less deeply eleft — 5. 3 { Telson more than twice as long as broad.... . . 2. C.flagellatus . . p.371 Telson less than twice as long as broad — 4. 4 \ Apex of telson with shallow sinus ....... 3. C. vitreus. . . . p.372 Apex of telson slightly arcuate . . ...... 4. C.tenuis . . . . p.372 5 ! Uropod 3, ramus more than half length of peduncle 5. C. bifureus . . . p.373 Uropod 3, ramus less than half length of peduncle 6. C. recurvus . . . p.373 1. C. subterraneus Bate 1859 (©. s., Bate in: P. Dublin Univ. zool. bot. Ass., v.1 p.237 | 1862 ©. s., Bate, Cat. Amphip. Brit. Mus., p.178 t.32 £.6 | 1893 ©. s., A. Della Valle in: F. Fl. Neapel, v.20 p.681 | 1896 C. s., Vejdovsky in: SB. Böhm. Ges., nr. 10 p.5. Side-plates 1—4 moderately deep, 4! the largest, slightly excavate behind. Pleon segments 1—3, postero-lateral corners seemingly obtusely quadrate. Eyes imperfeetly formed, showing small irregular patches of lemon- coloured pigment. . Antenna 1 about '/, length of the rest of the animal, 1st joint as long as 24 and 34 combined, flagellum as long as peduncle, about 11-jointed. Antenna 2 more slender. Gnathopod 1 stouter but shorter than gnathopod 2, 5% joint about as broad as 6%, but rather shorter, 6!h quadrate, palm slightly convex, not very oblique. Gnathopod 2, 5" joint much longer than broad, 6!" longer but scarcely broader, fusiform, palm very oblique, ill-defined. Peraeopods 1 and 2 much more slender than the following, which are successively longer, with well expanded 24 joint. Uropods 1—3 reaching nearly equally far back. Uropod 1, rami equal, rather shorter than pedunele. Uropod 2, rami equal, subequal to pedunele. Uropod 3, ramus about twice as long as the short peduncle. Telson narrow, entire. L. 5 mm. England (well in Hampshire). pr 2. C. flagellatus Benediet 1896 (©. f., J. E. Benedict in: P. U.S. Mus., v.18 p.616. Side-plates 1—4 moderately deep. Pleon segment 3, postero-lateral eorners obtusely quadrate. Eyes wanting. Antenna 1, 1° joint rather longer than 24, 24 nearly thrice as long as 34, 34 thrice as long as broad, flagellum sometimes as long as body, reaching 61 joints. Antenna 2 shorter, ultimate and penultimate joints of peduncle long, subequal, flagellum reaching 19 joints. Upper lip broadly rounded, longitudinally earinate. Lower lip, inner lobes small. Mandible, eutting edge and accessory plate dentate, accessory plate slighter on right mandible, few spines in spine-row, molar prominent, strong, palp, 24 and 34 joints large, subequal, well armed. Maxilla 1, inner plate 24* rt 372 Urangonyx with 6 setae, outer with 7 spines, 24 joint of palp with a few spinules on apex. Maxilla 2, inner plate with 4 setae on. inner margin, both plates armed apically. Maxillipeds, inner plates with 4 spine-teeth on truncate apex, outer plates scarcely so large, not reaching apex of palp’s 1° joint, fringed on apex and inner margin with slender spines, palp elongate. Gnathopods 1: and 2 similar, 5» joint triangular, cup-shaped, 6'" much longer, large, broadest at base, the long, oblique, rather convex palm fringed with numerous spines, the series continued beyond a large palm-defining spine, which the large curved finger reaches. Peraeopods 1—3 slight. Peraeopods 4 and 5 rather stronger and much longer. Peraeopods 3—5, 24 joint long oval. Uropods 1 and 2 extending much beyond uropod 3, strongly spinose. Uropod 1, pedunele longer than subequal rami. Uropod 2, peduncle subequal to slightly unequal rami. Uropod 3 short, pedunele rather broader than long, smooth, ramus much narrower and shorter, apically spinose. Telson about thrice as long as broad, slightly tapering to the truncate, very spinose apex. L. 12—14 mm. Texas (artesian well at San Marcos). 3. C. vitreus (Cope) 1872 Stygobromus v., E.D. Cope in: Amer. Natural., v.6 p.422 | 1888 Crangony« v., (S. 1. Smith in:) Pe in: Mem. Ace. Washington, ®.41 D 54 t.5 f. 1-4. Side-plate 4 the deepest, excavate behind, broader than any but the 5th, Pleon segments 1—3, postero-lateral corners obtusely quadrate. Eyes - wanting. Antenna 1 about '/, length of body, 1% joint as long as 24 and 34 combined, flagellum rather longer than peduncle, 10-jointed. Antenna 2 shorter, flagellum about 6-jointed. Gmnathopod 1, 5tk joint rather short and broad, 6! wider and much longer, palm making a very obtuse angle with the shorter hind margin. Gnathopod 2 much larger, 5tk joint short, triangular, cup-shaped, 6" large, widest at commencement of the long palm, thence narrowing to hinge of finger, palm fringed with spines and defined from the much shorter hind margin by 2 spines much longer than the rest, finger strong, curved. Peraeopods 1—3 subequal. Peraeopods 4 and 5 subequal, much longer than peraeopods 1—3; 24 joint in peraeopods 3—5 oblong oval. Uropods 1 and 2 extending beyond uropod 3; in uropod 1 peduncle considerably longer than the subequal rami, in uropod 2 only a little longer than the rami, of which the outer is a little shorter than the inner.. Uropod 3, pedunele short, stout, little longer than broad, single ramus minute, scarcely longer than broad, with 3 spinules at apex. Telson rectangular, nearly as broad as long, apical margin with a very shallow sinus in middle, each side of which is armed with several slender spines. Colour translucent. L. oO over 5 mm. Kentucky (Mammoth Cave). Furrowing in the mud of pools. 4. C.tenuis S.I.Sm. 1874 C.t., S.I Smith in: Rep. U. S. Fish Comm., v.2 p- 656 | 1893 ©. t., A. Della Valle in: F. Fl. Neapel, v.20 p. 682. Slender, elongated. Side-plates very shallow, more as in Niphargus than in Crangonyx. Eyes not perceived. Antenna 1 usually longer than antenna 2, flagellum with 16—19 joints in antenna 1, with 8—10 in antenna 2, but exceptionally large 9 had 1° antenna 5 mm long; flagellum twice as long as pedunele, with about 22 joints, antenna 2 stout, 6 mm long, flagellum as long as peduncle, 15-jointed. Gnathopods 1 and 2 differing little in the 2 sexes, gnathopod 1 the stouter, with palm more oblique, palm in both pairs armed on each side with a series of stout, obtuse spines, with a notch and IE ans Be a ee a Tan; a EA A ae ua rt Bet ul ra en = Ve Bi a FE ? Crangonyx 378 a cilium near the tip (this feature appears to be common in the genus). Uropods 1—3 extending to about the same point. Uropod 1, rami subequal, scarcely half as long as peduncle. Uropod 2, rami very unequal, outer half as long as inner. Uropod 3 scarcely as long as telson, the ramus very small, tipped with 4 or 5 setiform spinules. Telson ?/, as broad as long, tapering slightly to the entire, slightly arcuate apex, which is armed with about 10 slender spinules.. L. usual 6—8, largest d 13°5 mm. Connecticut (wells at Middletown). 5. C. bifurcus O.P. Hay 1882 C.b., O.P. Hay in: Amer. Natural., v.16 p.145 | 1894 €. b,, Chilton in: Tr. Linn. Soc. London, ser.2 v.6 p. 218. Pleon segments 1—3, postero-lateral angles drawn backward into a decided tooth. Eyes oval, black. Antenna 1, 1° and 24 joints subequal, 34 ®), length of 24, flagellum 24-jointed. Antenna 2 half as long as antenna 1, ultimate and penultimate joints of peduncle equal, these and the flagellum carrying sensory organs, which in spirit resemble a lanceolate or oblanceolate leaf having a midrib and parallel veinlets running from this to the margin. Gnathopod 2 with 6!" joint more elongate and with a more oblique palm than in gnathopod 1. Uropod 3, the ramus about ?/, as long as peduncle; a process of the peduncle is thought perhaps to represent the missing inner ramus. Telson twice as long as broad, sides nearly parallel, eleft nearly °/, of length, each prong armed at apex with 3—5 spines. L. about 9 mm. Mississippi (at Macon, from rivulet flowing down the limestone hills into the Noxubee-River). 6. ©. recurvus (Grube) 1861 Gammarus r., E. Grube, Ausfl. Triest, p. 137 | 1864 & 66 Crangonyx r., E. Grube in: Arch. Naturg., v.301 p.200; 0.321 p.410 t.10 f.1 | 1893\0, r., A. Della Valle in: F. Fl. Neapel, v.20 p. 682 | 1871 C. recurvatus, 8.1. Smith (& A. E. Verrill) in: Amer. J. Sei., ser.3 v.2 p. 448. Back smooth, pleon segments 1—3 not longer than the preceding. Side- plates 1—4 comparatively deep. Pleon segments 1—3, postero-lateral angles (in figure) acute. Eyes small, oval, composed of about 15 elements, pigment dispersed, black. Antenna 1 a little longer than half the body, flagellum con- siderably longer than peduncle, 14- or 15-jointed. Antenna 2 much shorter, ultimate and penultimate joints of peduncle equal, flagellum 5- or 6-jointed. Gnathopods 1 and 2 similar, 5tk and 6tk joints about equal in length and breadth, 6% longer than broad, subreetangular, palm scarcely oblique in gnathopod 1, a little more so in gnathopod 2, in neither as long as hind margin. Gnathopod 2, 5! and 6tk joints longer than in gnathopod 1. Peraeopods 3—5, 24 joint oblong oval, with erenulate hind margin. Mar- supial plates, except the last, very large, with long setae. Uropod 3 very short, not extending so far as 1° and 24, the ramus shorter than peduncle, with 1 or 2 spines at apex. Telson rather long, cleft to’the middle, apices acute. L. 3—6 mm. © Island of Cherso. C. ermannii (M.-E.) 1840 Gammarus e., H. Milne Edwards, Hist. nat. Crust., v.3 p.49 | 1862 Orangonys e., Bate, Cat. Amphip. Brit. Mus., p.179 t.32 f£.7 | 1893 C. e., A. Della Valle in:-F. Fl. Neapel, v.20 p.682. Eyes round, small. Antenna 1 the longer, flagellum longer than pedunele. Gnathopods 1 and 2 subequal, alike, 6th joint ovate, palm oblique, not defined, scarcely leaving any hind margin. Uropod 3 short, scarcely extending beyond preceding, ramus unarmed (Bate). According to Milne Edwards uropod 3 and telson end in two conical unarmed stylets. L. 15 mm. Warm springs of Kamtchatka. 374 Hyalellopsis, Pallasea 6. Gen. Hyalellopsis Stebb. 1899 Hyalellopsis (Sp. typ.: H. czyrnianskii), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 422. ’ Body (Fig. 85) smooth, pleon segments 4—6 very short. Head, rostrum insignificant. Side-plates I—4 moderately deep, rounded below, setuliferous, 4th excavate behind, much deeper than 5t". Antennae 1 and 2 short, antenna 1 rather the longer, with 1-jointed aecessory flagellum. Mouth-parts perhaps as in Gammarus (p. 460). Gnathopods 1 and 2 subchelate. Peraeopods 1—4, 24 joirit heart-shaped: Peräeopod 5 short, 24 joint as long as rest of limb, much expanded and distally produced. Uropods 1— 3 short, especially uropod 3, which is uniramous. Telson small, rounded. 1 species. 1. H. czyrnianskii (Dyb.) 1874 Gammarus e,, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.158 t.9 f.5 ! 1899 Hiyalellopsis c., T. Stebbing in: Tr. Linn. Soc. London, ser.2 ©.7 p. 422. Surface of body (Fig. 85) free from prominences, setae, spines, or hairs. Head, lateral lobes truncate, little produced. Pleon. segment 3, postero- . lateral corners (in figure) rounded. Eyes small, roundish, very prominent, black. Antenna 1 about '/, as long as body, little longer than antenna 2, peduncle stouter and somewhat longer, its 1° joint stout, flagellum 9—11-jointed, a little longer than peduncle; antenna 2, flagellum 5—8-jointed. Gnathopod 1, 6% joint piriform, more slender in S than in 9. Gmathopod 2, 6% joint oblong. Peraeopods 3 and 4, 24 joint having the slightly convex hind margin beset with short setae. Peraeopod 5, 24 joint having hind margin evenly rounded, produced nn Br .. a rounded .. and carrying I es NER while the front margin has long stout setae in fascicles. en ; Uropods 1 and 2 are said to reach beyond uropod 3 [After B. Dybowsky.] (scarcely in figure). Uropod 3 very short, rudimentary, ramus set like a stump on the short, broad pedunele, and carrying on its flat broad apex 5 or 6 stout spines. Telson small, leaf- like, semieireular. Colour dark horn-grey,. L. d 11, 0 7 mm. Lake Baikal. Depth 10 m. 7. Gen. Pallasea Bate 1793 [Subgen.] Gammarellus (part.), J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p.106 | 1862 Pallasea, Bate, Cat. Amphip. Brit. Mus., p.200 | 1867 P., G. O. Sars, Crust. d’Eau douce Norvöge, p. 67 | 1876 P., A. Boeck, Skand. Arkt. Amphip., v.2 p. 374 | 1893 P., A. Della Valle in: F. Fl. Neapel, v.20 p. 755 | 1899 P., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.422 | 1871 Pallasia (non Robineau-Desvoidy 1830, Diptera!), A. Boeck in: Forh. Selsk. Christian., 1870 p.206 | 1894 Pallasiella, G. O. Sars, Crust. Norway, v.1 p. 505. Rows of processes arming the back and sides or sides alone of some of the segments. Head, rostrum obsolete. Eyes prominent. Antenna 1 the longer, peduncle long, accessory flagellum rather short. Mouth-parts normal. Gnathopods 1 and 2 subchelate. Peraeopods 3—5 rather slender, 24 joint not greatly expanded, most so in peraeopod 5. Uropod 3 reaching to some Pallasea i 375 extent beyond the others, inner ramus the shorter, but often nearly equal to the outer. Telson seldom deeply cleft. . 10 species. Synopsis of species: Antenna 1, accessory flagellum 1-jointed. ..... 1. P.dybowskii. . . p.375 1 Antenna 1, accessory flagellum with more than one joint — 2. FR » Head with subdorsal dentate ridges. . . . . . 2. P.reissneri . . . p.376 Head without dentate ridges — 3, Peraeon segment 5 distinguished by its large pair of subdorsal teeth — 4. ‘ Peraeon segment 5 not distinguished by subdorsal teeth — 5. | Teeth of peraeon segment 5 simple, bent backward 4 re A 3. P. cancellus . . . p.376 | Teeth of peraeon segment 5 uheinate,raisedupward 4. P. gerstfeldtii. . . p. 3877 5 j Subdorsal processes wanting on peraeon — 6. \ Subdorsal processes present on peraeon — 8. 6 Uropod 3, inner ramus less than half outer . . 5. P. quadrispinosa . p.377 Uropod 3, inner ramus more than half outer — 7. Peraeon segments with median tubereles. . . . 6. P.kesslerii. . . . p.378 Peraeon segments without median tubereles . . 7. P.baikali... . . . p.378 a Pleon segments with subdorsal and marginal PER Ber ET a a 8. P. brandti . . . . p.379 N Pleon segments without marginal processes — 9. | Peraeon segments 1—4 with paired tubereles in EN RE ER EEE . Pgrubi,.. ., p. 879 | Peraeon segments 1—4 with single (almost ob- solete) tubereles in median line... ... 10. P. cancelloides . . p.380 1. P. dybowskii Stebb. 1874 Gammarus asper (non J. D. Dana 1852), B Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.155 t.13 f.1 | 1893 Acanthonoto- soma? a., A. Della Valle in: F. Fl. Neapel, v.20 p.927 | 1899 Pallasea dybowski, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.422. Peraeon segments 1—7 with lateral and marginal rows of tooth-like carinae or tubercles, marginal much stronger than the lateral, flattened, the first 5 almost twice as long as last 2, 5tk longer and more acute than the preceding; lateral rows consisting of small tubereles, the first 5 the stronger, the lateral rows slightly oblique. Pleon segments 1—3 with lateral rows of small tubereles, obscurely continued on segments 4—6, on segments 1 and 2 a small median tuberele. Head with arched upper profile, rostral margin blunt, little projeeting; on the cheek-lobe a thick rounded hump prolonged outward and downward. Side-plates 1—4 with no setae on lower margin, side-plate 4 with a central boss. Eyes not very large but very prominent, roundish, brown. Antenna 1 about '/, as long as body, nearly twice as long as antenna 2, peduncle somewhat longer than peduncle of antenna 2, flagellum 15—17-jointed, accessory flagellum 1-jointed. Gmnathopods 1 and 2, 6b joint larger in d than in ©, in gnathopod 1 piriform, in gnathopod 2 oblong. Peraeopods 3—5, 24 joint moderately broad, elongate oval, with short, distant setae on hind margin; in peraeopod 5 wing produced downward in a rounded lobe. Uropod 1 reaching end of peduncle of uropod 3. Uropod 2 reaching end of pleon 376 Pallasea segment 6, which is twice as long as segment 5. Uropod 3 in J !/,, in Q '/, as long as body, rami subequal, fringed with plumose setae. Telson much shorter than pedunele of uropod 3, rounded pentagonal, apical border almost truncate or faintly concave. Colour dark grey brown, with brighter markings and stripes, a dark stripe along the back, carinae darker than the rest of the body, often those to the rear red. L. 17 mm. Lake Baikal. Depth 10 m. 2. P. reissnerii (Dyb.) 1874 Gammarus r., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p. 126 t.3 f.1; t.4 £.7 | 1893 Pallasea? reissneri, A. Della Valle in: F. Fl. Neapel, v.20 p.930 | 1899 P. reisnerii, T. Stebbing in: Tr. Linn. Soc. London, ser.2.v.7 p. 422. Peraeon segments 1—3 with 2 rather remote median tubereular carinae, which dwindle away on segments 4 and 5, and are replaced by a single. carina on segment 6, which gradually encreases in height to pleon segment 3, successively more clearly divided by a saddle-shaped depression of the upper margin into 2 halves, of which the hinder is tooth-Iike, and on pleon segment 3 bent forward as a hook; pleon segment 4 with a tubereular keel, segments 5 and 6 quite flat. Peraeon segments 1—7 have marginal keels, perhaps representing a coalescence of marginal with subdorsal processes, the processes on segments 1—5 tolerably long and acute, on segments 6 and 7 blunt, tubereular. The swellings on the pleon segments are feebly indicated. Head, rostral point insignificant, upper surface rough, separated from the sides by ridges which have tolerably high, flat teeth at the ends; there is a lateral swelling above the eyes, and below and somewhat behind them a flat, double-pointed process. Eyes small, irregularly reniform, white. Antenna 1 half as long as body, about '/, longer than antenna 2, 1°t joint thick, longer than 24 and 34 eömbined, flagellum 32-jointed, accessory flagellum 3-jointed. Antenna 2, ultimate and penultimate joints of pedunele equal, flagellum 12-jointed. Gnathopod 1, 6!" joint slender, piriform, finger short. Gnathopod 2, 5th joint longer than in gnathopod 1, 6 joint slender, oblong, palm rather oblique, finger short. Peraeopods 3 and 4, 24 joint more or less heart-shaped. Peraeopod 5, 24 joint oblong, with rather long setae on hind margin, as in peraeopods 3 and 4. Uropod 3, outer ramus about "/, longer (not shorter, as misprinted in Dybowsky, p. 126) than the inner, 24 joint scarcely perceptible. Telson divided beyond the middle, with blunt apices (in figure). Colour white with shimmer of brown. L. J 25 mm. Lake Baikal. Depth 1300 m. 3. P. cancellus (Pall.) 1772 Oniscus ce. (Cancer baikalensis Laxman in MS.), Pallas, Spic. zool., v.9 p.52 t.3 £.18 | 1781 Gammarus ce., J. C. Fabrieius, Spee. Ins., v.1 p.515 | 1874 @. e., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 127 | 1793 Cancer (Gammarellus) c., J.F.W. Herbst, Naturg. Krabben Krebse, v.2 p.125t.35 f.12 | 1806 C.(Gammarus) c., Turton in: J. F. Gmelin, Gen. Syst. Nat., v.3 p. 760 | 1825 Amphithoe c., A. G. Desmarest, Consid. gen. Crust., p.268 | 1830 A. cancella, H. Milne Edwards in: Ann. Sei. nat., v.20 p.377 | 1862 Pallasea cancellus (Gammarus latreilli Guörin-Möneville in MS.), Bate, Cat. Amphip. Brit. Mus., p.200 t.36 f.1 | 1898 P. ce. (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p.755 t.60 f.26, 27 | 1776 Oniscus muricatus, Pallas, Reise Ruß., v.3 p. 709. ; Peraeon segments 1—7 and pleon segments 1—4 with a weak median carina formed by a small tuberele or blunt hump, the humps being strongest on the pleon segments. Immediately above the side-plates the margins of the peraeon segments form a weak carina, close above which are backward ne LEN a 4 A =, . = r ü äh ae ns = ra anheben A Na Linn BE ara an heran sn in arte ren ne Wrrilln Bud Die ten Pallasea 377 pointing blunt teeth, successively increasing towards and decreasing from those of segment 5, which are bent slightly backwärd and downward, and, besides being stronger than the rest, are set nearer to the middle of the back. In pleon segments 1—3 the lateral teeth are acute and rather long, on segments 4 and 5 they form weak carinae occupying about */, length of segment. Head, upper surface smooth, rostrum minute, a flat subacute tooth projeeting outward on the under margin of the lateral lobes. Eyes reniform or half-moon-shaped, black. Antenna 1 longer than half the body, twice as long as antenna 2, 1° joint rather long, 34 shorter than 24, flagellum 36—67-jointed, accessory flagellum 4—6-jointed. Antenna 2, flagellum 8—14-jointed. Maxillipeds normal (Bate: having a small squami- form plate to the ischium only, but his figure shows 24 joint produced as well as the 34), Gmathopod 1, 6% joint slender, piriform. Gnathopod 2, 6% joint more rhomboidal, broader, palm oblique. Peraeopods 3—5, 24 joint heart-shaped, with short setae on the hind margin. Uropod 3, rami sub- equal. Telson eleft '/, of length, each apex armed with a spinule. Colour greenish-brown, or brown with scattered dots. L. J attaining 70 mm to end of telson (with antenna 1:108 mm). Lake Baikal, near the shore; River Angara. 4. P. gerstfeldtii (Dyb.) 1874 Gammarus cancellus var. g., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.129 t.2 £.1 | 1893 Pallasea c. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.928 | 1899 P. gerstfeldtii, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.422. Resembling P. cancellus, but very strongly developed. On peraeon segments 1—4 a median carina of strong blunt teeth, the edge of which is often divided in segments 1 and 4; on segment 5 the carina is reduced to a little point, on segments 6 and 7 it is broad-based, spine-like, but variable in its strength and acuteness. The lateral teeth on peraeon segments 1—4 acute, successively longer, on segment 5 they are nearer to the median line, and appear as reaching high over the body, greatly curved or actually uncinate and backward bent, the distance between their tips being twice the breadth of the body at the base of the preceding pair of teeth; on segments 6 and 7 the lateral teeth are sharp; on pleon segments 1—3 they are somewhat more bent, successively shorter, and on segments 4 and 5 they are simple carinae. At the base of the lateral teeth, or between the latter and the median teeth, there is a small tuberele on peraeon segments 6 and 7 and pleon segments 1—3. As in P. cancellus, there are tubereles and spinules on the pleon segments 4 and 5, or 4—6#, the position of which is not very clear. Head, the tooth on the under margin of lateral lobes is more pointed and somewhat longer than in P. cancellus. Antenna 1, 34 joint as long as 24, or somewhat longer. L. attaining 75 mm to end of telson. Lake Baikal. Depth 20—50 m. e ‚5. P. quadrispinosa O. Sars 1861 Gammarus cancelloides (err., non Gerstfeldt 1858!), S. Loven in: Ofv. Ak. Förh., v. 18 p.287 | 1867 Pallasea ce. var. gvadrispinosa, G.O.Sars, Crust. d’Eau douce Norvöge, p.68 1.6 f.21-—-34 | 1876 P.g.. A. Boeck, Skand. Arkt. Amphip., v.2 p.375 | 1871 Pallasia q., A. Boeck in: Forh. Selsk. Christian., 1870 p-207 | 1894 Pgllasiella q., &. O. Sars, Crust. Norway, v.1 p.506 t.178 | 1874 Gammarus kesslerii var. europaeus, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.135 | 1893 Pallasea cancellus (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 755. Median carina wanting, body slender, peraeon segments 1—7 each with supramarginal obtuse nodiform prominence; pleon segments 1 and 2 each with a pair of strong, subdorsal, backward direeted, parallel teeth, wide 378 Pallasea apart, segments 4—6 without faseieles of spinules. Head, rostrum minute, lateral lobes smoothly rounded, a boss-like projection overhanging post- antennal corners. Side-plates 1—4 rather narrow, not contiguous below, 4th rather less deep than 34. Pleon segments 1—3, postero-lateral corners rounded (as perhaps throughout the genus). Eyes rounded oval, very dark. Antenna 1 about '/;, as long as body, 1° joint nearly as long as 24 and 3% combined, flagellum shorter than pedunele, with about 16 (Sars), with 24—15 (Dybowsky) joints, accessory flagellum with 2 joints, 24 the longer. Antenna 2 rather shorter, ultimate and penultimate joints of peduncle nearly equal, flagellum 6- or 7-jointed. Gnathopod 1, 6% joint piriform. Gmatho- pod 2 rather more slender, 6% joint oblong oval, palm nearly transverse; both pairs of gnathopods in C stronger than in O. Peraeopods 3 and 4, 24 joint little expanded, slightly narrowed below. Peraeopod 5, 24 joint larger than in preceding peraeopods, oval, fringed behind with setae. Uropod 1, rami much shorter than peduncle, smooth. Uropod 2 much shorter than uropod 1, rami with smooth sides. Uropod 3, outer ramus fringed with fascieles of slender setae, 24 joint minute, inner ramus scarcely more than '/, as’long as outer, setiferous on inner margin. Telson a little broader than long, 3 spinules on each side, emargination '/, of the length, apices rounded, tipped with a spinule. Colour yellowish grey, each segment banded transversely with. brownish green. L. d 15—19 mm. Lakes of Norway (Mjös-Sjö, depth 6—94 m, and others, also River Vorm), Sweden, and Russia (Finland, Onega). 6. P. kesslerii (Dyb.) 1874 Ganmmarus k., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.133 t.1 f.7 | 1893 Amathilla? k., A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1899 Pallasea k., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 422. Near to P. quadrispinosa (p. 377). Median carina represented by small tubereles on peraeon segments, peraeon segments 1—5 each with supramarginal strong acute tooth, segments 6 and 7 each with only a weak hump over the margin; pleon with addition of a little median tuberele on each of segments 1—3, and a flat lateral swelling on segment 3. Head, upper surface rough, with a median groove, narrowing forward; a strong outward and somewhat downward projeeting tooth overhanging post-antennal corners. Side-plates carinate. Eyes oval, very prominent, dark brown or black. Antenna 1 half as long as body, nearly twice as long as antenna 2, flagellum 20—28-jointed, accessory flagellum 2—4-jointed. Antenna 2, 7—9-jointed. Peraeopod 3, 24 joint sometimes widened below. Uropod 3, inner ramus in adults only about '/, shorter than outer, both carrying on their ‘margins numerous setae, the majority plumose. Telson very feebly emarginate, and very feebly grooved above distally. Colour bright greenish, with black or brownish spots, the appendages banded. L. reaching over 37 mm. Lake Baikal. Depth 10—20 m. 7. P. baikali Stebb. 1874 Gammarus lovenii (non @.Ioweni R.M. Bruzelius _ 1859!), B. Dybowsky in: Horae Soe. ent. Ross., ®.10 suppl. p.137 t.13 f.7 | 1893 Pallasea cancellus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1899 .P. baikali, T. Stebbing in: Tr. Linn. Soc, London, ser.2 «7 p.'422. Median carina wanting, peraeon segments 1—5 with marginal teeth, thinner, somewhat longer and more backward eurved than in P. cancelloides (p. 380); weak lateral swellings probably represent the lateral carinae;' pleon segments without teeth or humps, segments 4—6 each with a couple of small * Pallasea 379 ‚spinules on hind margin. Head, upper surface a little rough, under margin :of lateral lobes produced into an acute tooth. Eyes strongly protuberant, brown. ‚Antennal nearly "/, as long as body, about '/, longer than antenna 2, peduncle ‚longer than flagellum, flagellum 26—32-jointed, accessory flagellum 4-jointed. ‚Antenna 2, flagellum 8-jointed. Gmathopods 1 and 2, 6tk joint piriform. ‚Peraeopod 5, 24 joint twice as long as broad, narrower than usual in the ‚genus. Uropod 3, outer ramus about ?/,, longer than inner, both rami setose. Ei, ‚Telson rather long, with many lateral setules and shallowly concave apical margin. Colour brown, with white spots and bands. L. 33 mm. Lake Baikal. Depth 10—50 m. 8. P. brandtii (Dyb.) 1874 Gammarus b., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 136 t.14 f.1 | 1893 Ceradocus? b., A. Della Valle in: F. Fl. Neapel, 0.20 p.927 | 1899 Pallasea b., T. Stebbing in: Tr. Linn. Soc, London, ser.2 v.7 p. 422. Peraeon and pleon with 2 parallel median rows of tubereles, peraeon segments 1—7 each with marginal carina formed by a low, flattened, rounded tuberele, above which the lateral humps, successively higher, pass over into short, backward directed teeth; corresponding with and continuing the marginal and lateral carinae of the peraeon are ridges and teeth on the sides of pleon segments 1—3, but on segment 3 the median tubereles and the lateral tooth ‚are more feebly, while the ridge is more strongly developed than in segments 1 and 2. Head uneommonly large and tumid, rostrum very short, margin of lateral lobe thickened and carinate, a downward direeted boss behind the eyes. Side-plates 3—4 have little tubereles.. Eyes round or oval, strongly protuberant, as if stalked. Antenna 1 nearly half as long as body, and twiceas long as antenna 2, 1% joint thick, 34 variable, never less than half as long as 1, longer or shorter than 24, or equal to it, flagellum 30—45-jointed, accessory flagellum 4—6-jointed. Antenna 2, flagellum 9—12-jointed. Gnathopod 1,6!" joint piriform. Gmnathopod 2, 6! joint oblong, widening somewhat to the oblique palm. Peraeopod 5, 24 joint oval, rather wider above than below, marginal setae very short. Uropods 1 and 2 with setae on the margins and 1—3 spinules at the apices of the rami. Uropod 3, inner ramus scarcely shorter ‚than outer, both earrying many setae. Telson eleft to the middle (beyond it in figure), forming 2 tube-like lobes with the apices bent one to meet the other. Colour: head, peraeon segments 6 and 7, pleon segments 4—6 bright green, other segments brownish. L. reaching 35 mm. Lake Baikal. Depth 10—50 m. 9. P. grubii (Dyb.) 1874 Gammarus g., B. Dybowsky in: Horae Soc. ent. Ross., e.10 suppl. p.132 t.1 f.5 | 1898 Crangonya? g., A. Della Valle in: F. Fl. Neapel, v.20 p: 928 | 1899 Pallasea g., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 422, Peraeon segments 1—4 or 1—5 with 2 parallel mredian rows of tubercles separated by a groove; on the other peraeon segments the tubercles form. a single median row, continued by a weak median carina on pleon segments1—3; on peraeon segments 1—5 the marginal carina is represented by thick, broad, feebly flattened humps, on segments 6 and 7 by quite feeble, small humps; ‘the lateral carinae begin on peraeon segment 1 with very weak humps, encreasing on the following segments, and on 5—7 or 6 and 7 running out into short teeth; pleon segments 1 and 2 have each a pair of long, backward bent teeth, as in P. quadrispinosa (p. 377), and segment 3 has a lateral swelling. Head, upper surface rough, with median groove, bounded behind by 2 little tubereles; the sides below have a boss-like prominence. Eyes roundish oval, 380 Pallasea, Weyprechtia very protuberant, dark brown. Antenna 1 less than '/, as long as body, nearly twice as long as antenna 2, 1° joint elongate, flagellum shorter than peduncle, 25—29-jointed, accessory flagellum 2- or 3-jointed. Antenna 2, flagellum 8-jointed. Gmnathopod 1, 6t% joint piriform. Gnathopod 2, 6% joint oblong. Peraeopods 3 and 4, ga joint narrow, heart-shaped; peraeopod 5, 24 joint oval; long and thick setae on the margin in peraeopods 3—5. Uropod 3, outer ramus 4'/, times as long as the short, rudimentary inner ramus. Telson with a curved emargination, the upper surface depressed. Colour bright brownish green, with a whitish band over the middle of the back, often segments 2—4 darker than others; brownish spots occur; appendages banded. L. reaching 37 mm. Lake Baikal. 10. P. cancelloides (Gerstf.) 1858 Gammarus c., Gerstfeldt in: M&m. pres. Ace. St.-Petersb., 0.8 p.287t.9f.8 | 1874 @. e., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.130 t.13 f.6 | 1862 ‚Pallasea c., Bate, Cat. Amphip. Brit. Mus., p.380 | 1893 P. cancellus (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 755. Peraeon segments 1—7, median carina weak, tubercular, and on segments 1—3 inconspicuous, marginal carina more strongly developed than the lateral, the teeth directed outward and backward, acute, subequal, about twice as long as those of the lateral carina, which are directed backward, those of the 6! segment longer than the preceding, those of segment 7 nearly as long as the marginal teeth; pleon segments 1 and 2 with rather weak median carina, and on each side a strong, backward and outward bent tooth, longer than the lateral teeth on peraeon, pleon segment 3 with median carina flanked by weak humps, segments 4—6 almost smooth. Head tumid, with a prominence at the back, and a strong acute tooth projecting laterally from each cheek. Side-plate 4 with a weak tubercular projection. Eyes very protuberant, oval or broadly reniform, brownish black. Antenna 1 about ’/, as long as body, about */, longer than antenna 2, 1° joint twice aslong as24, 2dtwice aslong as 3, flagellum 22—-26-jointed, accessory flagellum 3-jointed. Antenna 2, flagellum 8- or 9-jointed. Gnathopods 1 and 2, 6% joint piriform, narrower and smaller in 9 than in d. Peraeopods 3 and 4, 24 joint elongate quadrangular, rather broader above than below, hind margin somewhat sinuous. Peraeopod 5, 24 joint oval, hind margin as in peraeo- pods 3 and 4 carrying long getae, Uropod 3, inner ramus only about ?/, shorter than outer, both with numerous setae, the majority plumose. Telson shallowly emarginate. Colour green or whitish green, with brownish black or brown spots. L. reaching 28 mm. Lake Baikal, under stones elose to the shore; River Angara at Irkutsk. 8. Gen. Weyprechtia Stuxb. 1880 Weyprechtia (Sp. un.: W. mirabilis), Stuxberg in: Bih. Svenska Ak., ©.5 nr. 22 p.27 | 1888 W., T. Stebbing in: Rep. Voy. Challenger, v.29 p.523 | 1894 W., T. Stebbing in: Bijdr. Dierk., v.17 p.41. Body dorsally smooth. Pleon segment 3, postero-lateral margins biden- tate. Antenna 1 the shorter, accessory flagellum 4—7-jointed. Upper lip not emarginate. Lower lip, inner lobes not distinet. Mandible, eutting edge little or not dentate, accessory plates dentate, spines of spine-row numerous, molar powerful, 34 joint of palp not curved, fully as long as 24 and 34 combined. Maxilla 1, inner plate with setae very numerous, outer with Sr De N en Zu Pe JB Ber > Fee N ET Sale FAT HE za Dane E Weyprechtia 381 11 spines, 24 joint of palp distally expanded and fringed in part with setae. Maxilla2, inner plate with close-set row of setae near the inner margin. Maxilli- peds, inner plates transversely truncate, outer scarcely reaching middle of palp’s 24 joint, which is little longer than 1° or 34, the finger short, thick, acute. Gnathopods 1 and 2 similar, slender, 5th joint at least as long as 6th, palm ill-defined, finger small. Peraeopods 3--5, 24 joint oval. Uropod 2 with unequal rami. Uropod 3, rami single-jointed, lanceolate, subequal. . Telson entire, longer than broad. 2 species. Synopsis of species: Side-plate 4 deeply and doubly emarginate . . » ..... 1. W. heuglini . p. 381 Side-plate 4 simply emarginate. . . . 2. 22.2. 200. 2. W. pinguis . p. 382 ; 1. W. heuglini (Buchh.) 1874 Amathilla h., Buchholz in: Zweite D. Nord- polarf., v.2 p.345 | 1893 A. heuglini, A. Della Valle in: F. Fl. Neapel, v.20 p.685 | 1894 Weyprechtia heuglini, T. Stebbing in: Bijdr. Dierk., v.17 p.41 t.7 | 1880 W. mirabilis, Stuxberg in: Bih. Svenska Ak., v.5 nr.22 p.28. Integument erustaceous, back rounded, broad; pleon segment 4 with trans- verse depression, of which also segments 1—3 show traces. Head dorsally broad, rostrum minute, front angles subtruncate, not very prominent. Side- . plates 1—3 narrow, truncate below, 1° with subacute front angle, 4" deeper, lower hind angle subacute, a strong downward curved horn dividing the hind margin into 2 great eurves. Side-plates I—5 somewhat projecting laterally, especially the 2 horns or angles of the 4th. Pleon segments 2 and 3, postero- lateral angles acute, segment 3 having a 24 and somewhat more produced tooth a little way above that of the postero-lateral angle. Eyes reniform, shining, black, curving round from side towards top of head. Antenna 1, 1 joint scarcely as long as 24 and 34 combined, flagellum twice as long as pedunele, attaining 32 joints, accessory flagellum 6- or 7-jointed. Antenna 2 about once and a half as long as antenna 1, ultimate and penultimate joints of pedunele equal, flagellum nearly twice as long as peduncle, about 40—59-jointed. Upper lip broadly rounded, almost truneate. Mandible, eutting edge appa- rently undivided (in younger specimens perhaps dentate), accessory plate of 4 teeth, as usual dissimilar in right and left mandible, 10 spines in spine- row, 34 joint of palp with one margin straight, longer than 24 and 34 com- bined. Maxilla 1, inner plate with about 30 plumose setae, 24 joint of palp distally widened, with several slender spines and setae on inner distal margin. Maxilla 2, inner plate with oblique row of about 30 long plumose setae near inner margin. Maxillipeds, outer plates, apical margin erowded with plumose setae passing over into serrate spines on inner margin.” Gnathopod 1, 24 joint the widest, 5tk joint narrow, longer than 6*%, which is rather long and narrow with small, indistinet palm, finger longer than palm, faintly serrate within, nail eurved, acute. Gmathopod 2 similar, but 5'% joint more widened, 6‘ nearly as long, palm even more indistinet. Peraeopods 1 and 2 slender. Peraeopods 3—5 considerably longer, 4 and 5tk subequal, longer than 34, 24 joint not very broadly oval, joints 4—7 rather elongate. Uropod 1, rami a little unequal, nearly as long as pedunele. Uropod 2, rami longer than peduncle, inner longer and broader than outer. Uropod 3, rami broad, much longer than peduncle. Telson a little variable, rather longer than broad, tapering to faintly emarginate apex, which carries 2 setules, some- ‘ 382 Weyprechtia, Paramieruropus. times producing a slightly trilobed appearance. L. reaching 51 mm (antenna 2: 24 mm). Arctie Ocean (Spitzbergen; Murman Sea, lat. 69° N., long. 59° E., depth 28m; glacial sea of Siberia between Cape Vankarema and Behring Strait, depth 7—11 m). 2. W. pinguis (Kröyer) 1838 Gammarus pingvis, Kröyer in: Danske Selsk., Afh., 0.7 p.252 t.1 f.5 | 1862 Amathia pinguis, Bate, Cat. Amphip. Brit. Mus., p. 200 | 1871 Amathilla pingvis, A. Boeck in: Forh. Selsk. Christian., 1870 p.218 | 1874 A, pinguis, Buchholz in: Zweite D. Nordpolarf., v.2 p.353 t.9 f.2 | 1878 A.p., Miers in: Nares, Voy. Polar Sea, v.2 p.246 | 1893 A.p., A. Della Valle in: F. Fl. Neapel, v.20 p- 684 1.59 f£.89 | 1895 A. p., Ohlin in: Acta Univ. Lund., ©.31 nr.6 p.50 | 1894 Weyprechtia p., T. Stebbing in: Bijdr. Dierk., 0.17 p.41. Closely resembling W. heuglini. Side-plate 4 with single normal emargination. Upper lip very large, not divided at the end (broadly conical, Buchholz; but ?). Mandible, cutting plate with few teeth on the point (Boeck), or completely without teeth (Buchholz). Gnathopods 1 and 2 with very oblique, straight, fairly well defined palm, longer than in W. heuglini. Peraeopod 4 intermediate in length between peraeopods 3 and 5 (Kröyer: a little smaller than 34 or 5). L. 24—29 mm (antenna 2 half this length). Aretic Ocean (Greenland, depth 6—56 m; Spitzbergen, a 4—22 m; ceircum- A reaching lat. 82° 24°’ N.). 9. Gen. Paramicruropus Stebb. 1899 Paramicruropus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 0.7 p.423, One of the pleon segments abruptly elevated above the next; pleon. segment 6 very small. Antennae 1 and 2 short; antenna 1 the longer, accessory flagellum small. Gnathopod 1, 6% joint not smaller than that of gnathopod 2.- Peraeopods 1—5 not elongate. Uropods 1 and 2 not very long. Uropod 3 ‚rudimentary, rami not very unequal. Telson small, entire. 2 species. Synopsis of species: Pleon segment 3 overarching the small 4th segment. . 1. P.solski . . . . p.882 Pleon segment 4 large, overarching the small 5th segment 2. P. taczanowskii . p. 382 1. P. solskii (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.42, 153 t.3 f.2 |1893 Amathilla? s., A. Della Valle in: F. Fl. Neapel, v.20 p.930 | 1899 Paramicruropus s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.423, Description incomplete. All segments (in figure) strongly ridged trans- versely, perhaps with exception of the very small pleon segments 4—6. Head not rostrate. Pleon segment 3 unusually large, overarching the small segment 4, grooved by a deep, horizontal, arched furrow. Eyes small, reni- form, black. Antenna 1 a little the longer, '/, as long as the body, pedunele shorter than in antenna 2, flagellum 17-jointed, accessory flagellum 3-jointed. Antenna 2, flagellum 12-jointed. Gnathopods 1 and 2 have short 5th joint, 6!h almond-shaped. Peraeopod 1 longer than peraeopod 2; peraeopods 3—5 with 24 joint narrowly oval, longitudinally carinate. Uropods 1 and 2 feebly developed, reaching back almost as far as uropod 3. Uropod 3, rami small, equal. Telson apically rounded (ef. Dybowsky’sanalyticalkey). Colour clouded yellow. L.23 mm. Lake Baikal. 2. P.taczanowskii (Dyb.) 1874 Gammarus t., B. Dybowsky in: Horae Soc. ent. Ross., v. 10 suppl. p.156 t.14 f.9 | 1893 Acanthonotosoma? t., A. Della Valle in: F. Fl. Neapel, v.20 p.930 | 1899 Paramicruropus t., T. Stebbing in: Tr. Linn, Soc. London, ser.2 v.7 p.423. er Paramieruropus, Parapherusa 383 - Head and all the segments dorsally granular, on each segment immediately above the side-plates a strongly developed carina, and encireling the back of each segment a broad, rib-like, granular, transverse prominence; on pleon segment 4 the prominence is divided by a deep longitudinal furrow; segments 5 and 6 very small, in the © so overarched by segment 4 as to be invisible in a side view, in the S more conspieuous. Head with rather long pointed rostrum, lateral lobes produced into an acute process as long as rostrum. Side- plates 1—4 ‚setose. Eyes point-like, black. Antenna 1 scarcely '/, as long as body, but much longer than antenna 2, 1% joint stout, flagellum shorter than peduncle, 12-jointed, accessory flagellum 1-jointed. Antenna 2, flagellum 6-jointed. Gnathopod 1, 6th joint oval, narrowing to finger hinge. Gmathopod 2 not larger, oblong, in en widening a little to the not very oblique palm. Peraeo- pod 5, 24 joint broader below than above, with long setae on both margins. Uropods 1 and 2 moderately long (not so long as in figure), reaching beyond the rudimentary uropod 3. Uropod 3, both rami very short, conical, with 1 long apical seta, inner ramus in 9 !/,,, in Q "/, shorter than outer (figure e difficult to reconcile with deseription). Telson broader than long, apical margin concave or shallowly emarginate. Colour wax-yellow. L. 10 mm. Lake Baikal. Depth 10—50 m. 10. Gen. Parapherusa Stebb.*) 1879 Harmonia (Sp. un.: H. crassipes), Harmomia (laps.) (non Harmonia E. Mulsant 1846, Coleoptera!), Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.330 | 1883 Harmonia, Chilton in: Tr. N. Zealand Inst., v.15 p.82 | 1880 Chloris (non Moehring 1758, Aves!), Haswell in: Ann. nat. Hist., ser.5 v.5 p.33. Side-plates shallow. Antenna 1 the shorter, accessory flagellum well developed. Mouth-parts normal. Mandible, 24 joint of palp as long as 34, but stouter. Maxilla 1, inner plate with about 10 long setae, outer with 11 spines, 24 joint of palp with 7 or 8 spine-teeth. .Maxilla 2, inner plate fringed on inner margin. Maxillipeds, inner and outer plates well armed. Gnathopods 1 and 2 subchelate, 24 much the larger in J, but not in ©. Peraeopods 3—5 very stout. Uropod 3 very short, rami equal, shorter than peduncle. Telson simple. l species. 1. P. erassipes (Hasw) 1879 Harmonia c., Harmomia c., Haswell in: P. Linn. Soe. N. S. Wales, v.4 p.330, 349; t.19 f.3 | 1883 "Harmonia c., Chilton in: Tr. N. Zealand Inst., v. 15 p.82 1.2 f.5a,h]| 1893 Protomedeia? e., A. Della Valle in: F. Fl. Neapel, v.20 p.442 | 1880 Chloris, Haswell in: Ann. nat. Hist,, ser.5 v.5 p.33. Pleon segments 5 and 6 very short. Head, lateral lobes rounded, little produced. Eyes well developed. Antenna 1 scarcely shorter than antenna 2, half as long as body, 24 joint scarcely longer than 1°, 34 short, flagellum rather longer than pedunele, about18-jointed, accessory flagellum 8-jointed. Antenna2, ultimate and penultimate joints of peduncle equal, flagellum much shorter than peduncle, about 10-jointed. Gnathopod 1, 6% joint rather longer than 5", oval, palm ill-defined. Gnathopod 2 in J, 5tk joint short, eup-shaped, 6t% very large, widening to the well-defined, suboblique, undulating palm, which has a square spinuliferous prominence adjacent to finger hinge and a similar but more convex one near the middle, finger strong, matching palm. Gnathopod 2 *), Nom. nov. TTapd, beside, Pherusa (see p.449). — The name Harmonia is preoccupied (1846, E. Mulsant, Hist. nat. Col. France, Securipalpes p. 108), also the name Chloris (1758, P.H.G. Moehring, Gesl. Vog., p.3, 24). 384 sygesgirten Amathillopsis in 9, gnathopod 1, but with shorter 5tk and longer 6th joint. Peraeopods 1 and 2 not very stout. Peraeopods 3—5, 24 joint oblong, other joints, including finger, very stout, peraeopods 4 and 5 longer than 34, Uropods 1—3 not elongate, in uropod 1 rami as long as peduncle, in uropods 2 and 3 shorter than peduncle. Telson rather longer than broad, sides converging to a truncate apex, which has a setule at each of the blunt angles.. Colour brown. L. 4 mm. South-Paeifie (Port Jackson [New South Wales], Griffith’s Point [’Vietoria]; Lyttelton Harbour, and Timaru [New Zealand]). 11. Gen. Amathillopsis Heller 1875 Amathillopsis (Sp. un.: A. spinigera), Cam. Heller in: Denk. Ak. Wien, v.85 p.85 | 1885 A., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust.I p.181 | 1888 A., T. Stebbing in: Rei; Voy. Challenger, v.29 p.442, 859 | 1894 A., T. Stebbing in: Bijde; Dierk., ®. 17 p. 27. Integument crustaceous, body dorsally carinate, with several strongly produced teeth. Head, rostrum short. Side-plates not very deep. Antenna 1 the longer, peduncle long, 24 joint as long as 1°, accessory flagellum very small. Upper lip with margin entire. Mandible normal, 24 and 34 joints of palp long. Maxilla 1, inner plate with 6 or 7 setae, outer with 11 only slightly dentieulate spines, 24 joint of palp elongate, armed both on right and left maxilla with spines and setae. Maxilla 2, inner plate setose or only eiliated on inner margin. Maxillipeds, outer plates small, extending not far along the 24 joint of the long palp. Gnathopods 1 and 2 alike, sub- chelate, 5tk joint as long as 6!%, palm ill-defined. Peraeopod 5, so far as known, the shortest. Uropod 1, rami shorter than peduncle, outer ramus shorter than inner. Uropod 3, rami lanceolate, outer a little shorter than inner, Telson short, slightly emarginate. 3 species. Synopsis of species: 1 f Gnathopods 1 and 2, 5th joint distally little expanded . 2. A. affinis . . p.385 \ Gnathopods 1 and 2, 5th joint distally much expanded —2. j Telson much shorter than peduncle of uropod3. . . 1. A. spinigera . p. 384 \ Telson subequal to peduncle of uropod 3...... 3. A. australis . p. 385 pP 1. A. spinigera Heller 1875 A.s., Cam. Heller in: Denk. Ak. Wien, 0.35 p.85 t.3 £.17—22; t.4 f.1—8 | 1885 & 86 4A. s., G.O. Sars in: Norske Nordhavs-Exp., 0.6 Crust. I p.181 t.15 f.2; Crust. II p.61 | 1888 A. s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.442, 865 | 1894 A. s., T. Stebbing in: Bijdr. Dierk., v.17 p.28 | 1893 Amathilla s. (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 684 t.59 f. 88. Peraeon broad, pleon ecompressed; body carinate faintly on head, and thence strongly to pleon segment 4, peraeon segment 1 with 2 upstanding acute processes, the other carinate segments each with one, successively larger to that on pleon segment 2, the next a little, and the next again much smaller than that preceding it. Peraeon segments 1—4 with lateral margins produced outward in acute processes. Head, rostrum very short, slightly deflexed, not projeeting ‘beyond the lateral corners which are quadrate, bases of antenna 2 conspicuous in the incision below. Side-plate 1 small, faintly emarginate below, 24—4th strongly emarginate below between 2 acute points, 5th subequal to 4th in depth and much broader, both lobes acute, 6! with Amathillopsis 385 only hind lobe acute. Pleon segments 1-—3, postero-lateral corners acutely produced, less in 39 than in 1% and 24. Eyes yellowish white, very small, oval, prominent, adjacent to a cavity in the lateral corners of head. Antenna 1, joints 1 and 2 long, subequal, 39 about "/, as long as 24, flagellum rather longer than pedunele, with a great number of very short joints, accessory flagellum spine-like, 24 joint minute. Antenna 2 rather shorter and more slender, basal joints short and stout, ultimate joint of pedunele shorter than penultimate, flagellum rather longer than pedunele and, as in antenna 1, calceoliferous. 8 Mandible, 3% joint of palp very little shorter than 24. Maxilla 1, outer plate has 12 spines (Heller; but 11°). Maxilla 2, inner plate with setae on inner margin. Maxillipeds, outer plates with short spine-teeth on inner margin, continued in longer forms round the apical margin. Gmnathopod 1, 5th joint narrow proximally, then much widened, wider than the oval sub- fusiform 6", both setose on hind margin, finger long, eurved. Gnathopod 2 with 5% joint wider and rather longer, its distal lobe more rounded, 6! joint slightly longer than in gnathopod 1, but searcely differing. Peraeopods 3—5, 24 joint scarcely (in peraeopod 5 a little more) expanded, sharply carinate behind and produced into a small distal tooth, peraeopod 4 shorter than 34, and 5tk shorter than 4%, Uropods 1—3, peduncle and rami with sharp margins, outer ramus shorter than inner, especially in uropod 2. Uropod 3, rami nearly equal to one another and to pedunele. Telson much shorter than peduncle of uropod 3, a little hollowed on surface, rather longer than broad, apically a little widened and emarginate between the rounded corners. Colour straw-yellow, mouth-parts and front legs vivid red. L. reaching 57 mm from rostrum to end of uropod 3; (antenna 1: 43 mm). Aretie Ocean (Spitzbergen, Franz Josef Land); North-Atlantie (lat. 63°— 76° N.). Depth 240—1408 m. 2. A. affinis Miers 1881 A.a., Miers in: Ann. nat. Hist., ser.5 7 p.48 t.7 f.3—5 | 1888 A. a., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 865 | 1893 Amathilla spinigera (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 684. Agreeing in many respeets with A. spinigera. Side-plates not so distinetly emarginate, 4"! much more developed. Antenna 1, 34 joint relatively shorter than in A. spinigera, flagellum very long and slender, accessory flagellum ‚very minute. Antenna 2 little more than half as long as antenna 1. Gmathopods 1 and 2 slender and feeble, 5" joint gradually widening to the distal end, which forms no lobe, 6! joint as long and wide, oblong, slightly widened at the palm, which is much shorter than hind margin, finger short in proportion. Gmathopod 2 rather the longer. In all the legs 24 joint oblong oval, much more expanded than in A. spinigera. Telson not distally widened. Aretie Ocean (Franz Josef Land). 5 3. A. australis Stebb. 1883 A.a., T. Stebbing in: Ann. nat. Hist., ser.5 vo. 11 P-205 | 1888 A. a., T. Stebbing in: Rep. Voy. Challenger, v.29 p.860 t.65 | 1893 Ama- thilla spinigera (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 684. Peraeon broad, pleon compressed. Carina indicated on head, peraeon segments 1—4, pleon segments 4—6; on peraeon segments 5—7 and pleon segments 1—3, prolonged into acute processes, successively larger. Head, rostrum small, deflexed, not projecting so far as the lateral corners. Side-plates 3 and 4 deeper than the rest, acute at lower front corner. Pleon segments 2 and 3, postero-lateral corners acutely produced. Eyes not perceived. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda 1. 25 386 Amathillopsis, Gammarellus Antenna 1, 1° and 24 joints equal in length, 34 rather longer than '/, of 24, flagellum broken, the remnant as long as 1°! joint of pedunele, containing 50 short joints, accessory flagellum seemingly represented by a strong, flat, incurved spine. Antenna 2 less robust, similar to that of A. spinigera, flagellum incomplete, with 70 joints, as in antenna 1 calceoliferous. Epistome carinate. Upper lip, with the rounded margin flattened at centre. Lower lip probably without inner lobes. Mandible, accessory plate much stronger on left than on right mandible, 34 joint of palp considerably longer than 1% and 24 combined. Maxilla 1, inner plate with 7 setae, outer with 11 spines. Maxilla 2, inner plate merely eiliated on inner margin. Maxillipeds, inner plates short, outer reaching little beyond 1° joint of palp, inner margin denticulate, with submarginal spinules, apical margin with long spines, palp elongate. Gnathopods 1 and 2, 24 joint with distal half much expanded behind, rest of limb as in A. spinigera. Peraeopods 1 and 2, 24 joint with hind margin a little expanded. Peraeopods 3—5 imperfect, 24 joint carinate on front and hind margins, a little expanded behind proximally and in front distally, shorter in 4% than 34, and in 5tk than 4%, with proximal expansion encreasing. Pleopods with numerous cleft spines on 1°t joint of inner ramus. Uropod 1, pedunele longer than rami, outer ramus a little the shorter. Uropod 2, pedunele shorter than inner ramus. Uropod 3, pedunele much shorter than the lanceolate rami, of which outer is slightly the shorter. Telson subequal to peduncle of uropod 3, longer than broad, slightly narrowing to the weakly emarginate apex. L. about 38 mm. ‚Coral Sea (between Australia and New Guinea, lat. 12% S., long. 145° E.). Depth 2560 m. 12. Gen. Gammarellus Herbst 1793 [Subgen.] Gammarellus (part.), J. F. W. Herbst, Naturg. Krabben Krebse, v.2 p.106 | 1899 @., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.423 | 1837 Amathia (Sp. un.: A. carinata) (non Lamouroux 1812, Hydrozoa!), H. Rathke in: M&m. pres. Ac. St.-Petersb., 0.3 p.375 | 1862 Grayia (Sp. un.: @. imbricata) (non Alb. Günther 1858, Reptilia!), Bate (& Westwood), Brit. sess. Crust., v.1 p.151 | 1862 Graya (non C. L. Bonaparte 1856, Aves!) (part.), Bate, Cat. Amphip. Brit. Mus., p. 101; t. 14a, 16 | 1895 Grayia, A. O. Walker in: Ann. nat. Hist., ser.6 ».15 p.466 | 1862 Amathilla, Bate & Westwood, Brit. sess. Crust., v.1 p.859 | 1893 A. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.683 | 1894 A., T. Stebbing in: Bijdr. Dierk., v.17 p.40 | 1894 A.. G. O. Sars, Crust. Norway, o.1 p. 489. Body dorsally carinate. Antennae 1 and 2 subequal, ind calceoliferous, accessory flagellum 4—7-jointed. Upper lip not emarginate. Lower lip, inner lobes not distinet. Mandible normal, both plates dentate, spines of spine-row numerous, 34 joint of palp faleiform, armed on both margins. Maxilla 1, inner plate with setae numerous, outer with 11 spines, 24 joint of palp scarcely expanded distally. Maxilla 2, inner plate fringed near inner margin. Maxillipeds, outer plates well armed, not reaching middle of palp's 24 joint, 39 joint of palp notably smaller than 24, very setose. Gmathopods 1 and 2, 5th joint cup-shaped, 6tk much larger, oval, palm feebly defined, finger strong. Peraeopods 1—5 rather stout, 24 joint oval in last three. Branchial vesieles pleated obliquely. Uropod 3, rami single-jointed, lanceolate, outer a little the longer. Telson feebly emarginate. 2 accepted and 1 doubtful species. Synopsis of the accepted species: Dorsal carina of some segments produced backward .. . 1. G.homari . . p.887 Dorsal carina of no segment produced backward . . . . . 2. G. angulosus . p. 387 N. I ee CH ET ING a T. a Gammarellus 387 ‚1. G.homari (F.) 1779 Astacus h., J.C. Fabrieius, Reise Norweg., p.247 | 1788 Cancer (A.) h., J. F. Gmelin, Syst. Nat., v.1 p.2986 | 1798 Gammarus h., J. ©. Fabrieius, Ent. syst., Suppl. p.418 | 1888 Amathilla h., T. Stebbing in: Rep. Voy. Challenger, v.29 p-45 ete. | 1893 A.h. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 685 t.59 f. 90 | 1894 A. h., T. Stebbing in: Bijdr. Dierk., ©.17 p.40 | 1894 A. h., G. ©. Sars, Örust. Norway, v.1 p.490 t.172, t.173 £.1 | 1895 A. h., A.O. Walker in: Ann. nat. Hist., ser. 6 v.15 p.466, 471 | 1899 Gammarellus h., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 9.7 p.423 | 1780 Oniscus arenarius (non Slabber 1769!), ©. Fabrieius, Fauna Groenl., p- 259 | 1887 Amathilla arenaria, H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p. 149 |,1798 Cancer (Gammarellus) homari + C. (@.) arenarius, J. F. W. Herbst, Naturg. Krabben Krebse, ©.2 p.113; p.133 | 1819 Gammarus sabini, Leach in: John Ross, Voy. Baftin’s Bay, app. p. 68 | 1862 Grayia imbricata + Amathilla s. (part.), Bate & Westwood, Brit. sess. Örust., v.1 p.152; p.361 f. | 1874 A. s., Buchholz in: Zweite D. Nordpolarf., v.2 p.346 Crust. t.8£.1,2; .9 £.1 | 1827 Gammarus marinus (err., non Leach 1815!), G. Johnston in: Zool. J., v.3 p.176 | 1828 @. carinatus (non J.C. Fabrieius 1793!), G. Johnston in: Zool. J., v. 4 p.52 | 1857 Amathia carinata, A. White, Hist. Brit. Urust., p. 182 | 1851 Amphitho& moggridgei, Bate in: Ann. nat. Hist., ser.2 v.7 p.318 t. 10 f.10 | 1862 Grayia imbricata, Graya i. + Amathia sabinii + A. carino-spinosa (part.), Bate, Cat. Amphip. Brit. Mus., p. 101 t.16 f.4; p. 197 t.35 £.9; p.199 t.35 £.11. Body robust in O0, more compressed in d. Peraeon segments 1—7 and pleon segments 1—3 with compressed dorsal carina produced more or less backward, that of peraeon segment 1 rather broad and also a little acutely produced forward; pleon segment 4 with a transverse dorsal “depression followed by a carina. In the young the dorsal prominences are much less marked. Head depressed, rostrum small, lateral corners obtusely truncate. Side-plates 1—4 suecessively larger, but in young 1°% little smaller than 24 or 34, Side-plate 4 emarginate behind. Pleon segment 3, postero-lateral corners quadrate. Eyes large, oblong reniform, dark brown. Antenna 1 in O about '/, aslong as body, 1° joint not as long as 2dand 34 combined, 22 not much longer than 34, flagellum once and a half as long as peduncle, with 40—55 setulose joints, accessory flagellum 6- or 7-jointed. Antenna 2 a little shorter, ultimate joint of peduncle shorter than penultimate, flagellum subequal to pedunele, 40-jointed, setulose and ealceoliferous. Antenna 2 in C more slender than in O0, rather longer than antenna 1, pedunele longer than flagellum. Gnathopods 1 and 2, 6! joint oval, narrowing to hinge of finger, palm setose and spinose. Gmathopod 2 the larger. Peraeopod 5, 24 joint larger than in peraeopods 3 and 4, its hind margin sinuous below. Uropod 3, outer ramus rather the larger, both rami setose on inner margin. Telson rather longer than peduncle of uropod 3,.much longer than broad, tapering to a rounded apex, in the centre of which is a little emargination flanked by a pair of spinules. Colour variable, olive-green or white miarbled or banded with brown or red. I. variable, reaching 44 mm (antenna 2 JS: 20 mm), Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland, Spitzbergen, Murman Coast, Aretie America, Norway, British Isles, France); Kattegat. Depth 0—206 m. 2. G. angulosus (H. Rathke) 1843 Gammarus a., H. Rathke in: N. Acta Ac. Leop., v. 201 p. 72 t.3 f.3 | 1855 @. a., W.Liljeborg in: Vetensk. Ak. Handl., 1853 p. 447 | 1871 Amathilla angulosa, A. Boeck in: Forh. Selsk. Christian., 1870, p-217 | 1894 A.a., G.O, Sars, Crust. Norway, v.l p.492 t.173 f.2 | 1899 Gamma- rellus angulosus, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.423 | 1862 Amathia carino-spinosa (part.), Bate, Cat. Amphip. Brit. Mus., p.199 | 1862 Amathilla sabini (part.), Bate & Westwood, Brit. sess. Crust., v.1 p.862 | 1898 A. homari (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.685 | 1895 A. h., A. O. Walker in: P, Liverp. biol. Soe., v.9 p.307. Often confounded with but distinet from G. homari. Body short and stout, in front angular, behind dorsally carinate, but carina in each segment 25* 388 Gammarellus, Euerangonyx truncate, not produced into a tooth, integument very minutely squamose. Head, rostrum short, obtuse, lateral corners evenly rounded. Side-plate 5, hind lobe deeper than front. Pleon segment 3, postero-lateral corners obtusely angular. Eyes oblong, dark brown. Antennae 1 and 2 subequal. Antenna 1, flagellum 21-jointed, accessory flagellum 4- or 5- jointed. Antenna 2, flagellum 22- or 23-jointed. Gnathopods 1 and 2, exactly alike both in size and structure (Sars). Peraeopods 1-5 short and stout, subequal. Peraeopod 5 the longest, 24 joint with hind margin not sinuous. Uropod 3 less setose than in G.homari (p. 387). Telson oval quadrangular, scarcely longer than broad, little tapering, with a small apical emargination flanked by a pair of spinules. Colour olive-green (Liljeborg), or yellowish, mottled with reddish brown (Sars). L. reaching 12 mm. Arctie Ocean, North-Atlantic, North-Sea and Skagerrak (Vardö [North-Norway], - South- and West-Norway., Bohuslän); Kattegat. French and British localities doubtful. G. carinatus (H. Rathke) 1837 Amathia carinata, H. Rathke in: M&m. pres. Ace. St.-Pötersb., v.3 p.375 t.5 f.29-—-35 | 1862 A.c., Bate, Cat. Amphip. Brit. Mus,., p. 198 t.35 f.10 | 1868 Amathilla e., Ozerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.151 | 1899 Gammarellus carinatus, @. homari (part.)?, T. Stebbing er Tr. Linn. Soc. London, ser.2 v.7 p. 423. Probably synonym to G. homari (p. 887). Carina only on peraeon segments 5—7 and pleon segments 1—3. L. about 15 mm. Black Sea. 13. Gen. Eucrangonyx Stebb. 1899 Euerangonys, T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 4283. Like Crangonyx (p. 370) in general, but with a small inner ramus to the 34 uropod, telson emarginate. 5 species, Synopsis of species: 1 Telson elongated in d, not n® ........ 1. E. mucronatus . p. 388 Telson alike ind and @ — 2. Er WE een ae 2. E. vejdovskyi . p. 389 Eyes devoid. of black pigment. .. - ....2.. 3. E. packardii . . p. 389 Eyes with black pigment — 38. ! Side-plate 4 not unusually large .. .. 2... 4, E.gracilis. . . p.390 Side-plate 4 unusually large . ......».. 5. E. antennatus . p. 390 1. E. mucronatus (S. A. Forb.) 1876 Orangonyx m. S. A. Forbes in: Bull. Illinois Mus., v1 p.6.£.1—7 | 1888 ©. m., Packard in: Mem. Ac. Washington, v.41 p- 37 t.5 f.15 | 1893 ©. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 682 | 1894 C. m., Chilton in: Tr. Linn. Soc. London, ser.2 v.6 p.219 | 1899 Eucrangonyx m., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 4283. Pleon segments 1—3, postero-lateral corners broadly rounded. Eyes wanting. Antenna 1 in d sometimes *, as long as body, 1° and 24 joints subequal, 34 !/, as long as 24, flagellum about 5 times as long as peduncle, 30— 35-jointed, 2-jointed accessory flagellum a little longer than 1°* joint of primary. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 9- or 10-jointed. Antenna 1 in © about half length of body, flagellum thrice as long as peduncle. Upper lip well rounded. Mandible with several spines in nr en Te ; Euerangonyx 389 spine-row, 1° joint of palp longer than broad, 34 fully as long as 24, curved. Other mouth-parts agreeing with those of Crangonyx flagellatus (p. 371). Gnathopod 1 in CS, 5t& joint subtriangular, °®/, as wide as 6th, 6! broadly ovate, °/, as wide as long, hind margin very short, palm oblique, not sharply defined, fringed with about 15 notched spines. Gnathopod 2, 5th joint as wide as 6%, rather longer than in gnathopod 1, 6% joint also a little longer and narrower. In Q gnathopod 1 has hind margin longer, palm shorter, and gnathopod 2is decidedly smaller than gnathopod 1. Peraeopod 3 about ?°/, as long as peraeopod 5, peraeopod 4 intermediate in length, 24 joint in all narrowly oval. Uropod 1 extending beyond uropod 2, and 24 beyond 34, Uropods 1 and 2 stout, each with subequal rami, shorter than peduncle. Uropod 3 short, outer ramus half as long as peduncle, inner ramus rudimentary, unarmed, '/, or '/, as long as outer. Telson in J smooth, cylindrical, apieally rounded and tipped with spinules, normally about as long as pleon segments 1—3, sometimes half as long as the body. In © it is only little longer than broad, extending to apex of uropod 3, flattened, slightly emarginate, with 2 terminal elusters of 4 or 5 spines. Golourless. L. 9—10 mm. Illinois. Well at Normal, and in springs. 2. E. vejdovskyi Stebb. 1896 Crangonyx subterraneus (err., non Bate 1859)), Vejdovskf in: SB. Böhm. Ges., nr. 10 p.12 t.1—3 | 1899 Euerangonyx vejdovskyi, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 423. Oo. Side-plate 4 much deeper than those which follow, broad, emarginate, lower margin erenulate. Pleon segments 1—3, postero-lateral corners rounded. No trace of eyes, but variable orange-or lemon-coloured pigment-masses in their place. Antenna 1, 1° joint not as long as 24 and 34 combined, 34 in figure even longer than 24, flagellum somewhat longer than peduncle, with 9—13 joints; accessory flagellum, 1° joint twice as long as 24. Antenna 2 shorter, ultimate joint of peduncle (in figure) much shorter than penultimate, flagellum 3—-5-jointed. Lower lip, inner lobes (in figure) not very distinet, mandibular processes unusually prolonged. Mandible, 24 joint of palp broad, considerably longer than 34. Maxilla 1, inner plate with 4 setae, outer with 6 (7?) spines. Maxilla 2, inner plate with setae near the inner margin. Maxillipeds, outer plates not reaching the middle of palp’s 24 joint, palp’s 4!" joint with a nail. Gnathopods 1 and 2, 5th joint shorter than -6tk, distally nearly as wide, 6! rectangular, nearly twice as long as broad in gnathopod 1, and more than twice ” as long as broad in gnathopod 2, palm convex, not very oblique, much shorter than hind margin, finger with nail. Peraeopods 1 and 2 very slender, said to be slightly longer than peraeopods 3—5, which have the 24 joint oval, with serrate margins, the 4! rather long and distally somewhat widened. Uropod 1, pedunele as long as the equal rami. Uropod 2, peduncle shorter than the rami. Uropod 3, pedunele half as long as outer ramus, which carries 6 or 7 spines, inner ramus rudimentary, flattened, shorter than peduncle. Telson almost square, apex with rounded emargination, and 5 or 6 spines on either side. Accessory branchiae on peraeon segments 5—7 latero-ventrally inserted somewhat behind the basal joint of the peraeopod, direetly behind the primary branchiae. L. 4 mm. BIT Wells near Prague. 3. E. packardii (S.I. Sm.) 1873 Orangonyx vitreus (err., non Stygobromus v. E.D.Cope 1872!), Packard in: Rep. Peabody Ac., 0.5 p.95 | 1888 C. packardii, (S. I. Smith in:) Packard in: Mem. Ae. Washington, ».4I p.85 t.5 f.5—11 | 1899 Euerangonyx P., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 423. 390 Euerangonyx Eyes small, round, without dark pigment. Antenna 1, 1° joint little longer than 24, 34 ®/, as long as 2%, flagellum not twice as long as peduncle, with 14 joints, accessory flagellum not longer than 1° joint of primary. Antenna 2, ultimate and penultimate joints of peduncle equal, flagellum of few joints. Gnathopod 1 (in ao 5 mm long), 5" joint trapezoidal, 6" oblong, palm little oblique, much shorter than hind margin; gnathopod 2 similar, but 6th joint longer, with more oblique palm. In largest OÖ gnathopod 1 has a more triangular 5!" joint and the 6! more expanded, bar 2 thau the dt, and gnathopod 2 also has the palm much more oblique and longer than hind margin. Peraeopods 1—5 differ from those in E. gracilis in having the spines more numerous, longer and more slender. Uropods 1 and 2 have the spines shorter and more obtuse than they usually are in E. graeilis, but otherwise these 2 closely allied species agree in uropods and telson. L. reaching 75 mm. Indiana (wells in Orleans and at New Albany). 4: E. gracilis (S. I. Sm.) 1871 Crangonys g., S. I. Smith (& A. E. Verrill) in: Amer, J. Sei., ser.8 ©.2 p. 453 | 1898 C. g., A. Della Valle in: F. Fl. Neapel, v.20 p. 682 | 1894 ©. g., Chilton in: Tr. Linn. Soe. London, ser. 2 0.6 p.218 | 1899 Eucrangonyx g., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 423. Pleon segments 1—3, postero-lateral corners produced and endingin a small tooth. Eyes slightly elongated, composed of a few black: facets. Antenna 1 rather more than half as long as body, 1° and 24 joints subequal, 39 ?/, as long as 24, flagellum not twice as long as peduncle, with about 20 joints, accessory flagellum as long as 1 joint of primary. Antenna 2 about half as long as antenna 1, ultimate and penultimate joints of peduncle long, subequal, flagellum rather shorter than peduncle, 7- or 8-jointed. Gnathopods 1 and 2 of Q asin E. packardii (p. 389). In S gnathopod 1 has palm slightly oblique, strongly spined, gnathopod 2 has 6th joint proportionally shorter than in Q, encreasing considerably in breadth distally, palm much more oblique, slightly arcuate and spinose. .Peraeopod 5 slightiy ve than peraeopods 3 and 4, 24 joint in all having hind margin serrate. Uropod 3 reaching apex of uropod 3, outer ramus nearly twice as long as peduncle, armed with a few slender spines, inner minute, unarmed, shorter than diameter of outer. Telson scarcely as long as peduncle of uropod 3, a little broader than long, apical margin with a trian- gular emargination, on either side of which the extremity is truncate, and armed with three ‚spines. L. © 6—7, 0 ,5—14 mm. North-America (Lake Superior, Lake Huron). 5..E. antennatus (Pack.) 1881 Crangonyx a., Packard in: Amer. Natural., 0.15 p.880 | 1888 C.a., Packard in: Mem. Ae. Washington, 0.41 p.36 t.5 f.12, 14; textf. | 1893 CO. a., A. Della Valle in: F. Fl. Neapel, v.20 p.682 | 1899 Eucrangonyx a., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 423. Side-plates 1—4 very unequal, 1 very small, 4 unusually large and nearly square, but seemingly much excavate behind. Pleon segments 1—3, postero-lateral corners subacute. Eyes distinet, well developed, black, but not so distinet and only '/, as large as in E. gracilis. Antenna 1 nearly ”), as long as the body, 24 joint of peduncle is said to be much longer than in E. gracilis, 34 rather more than half 24, flagellum 20—24-jointed. Antenna 2 (in figure) not '/, as long as antenna 1. Gnathopods land 2 and peraeo- pods 1—5 apparently as in E. gracilis, as also uropods 1—3 and telson, but rami of uropods are said to be slightly stouter and more polished, and the spinules a little stouter. Colour purplish. L. 6—7 mm. Tennessee (subterranean stream of Nickajack ÜUave). nn u ae a 2 u Tee mes B a a ale a ra u ae 7 2 A 4 A > Br "8 14 2 2: & De di Axelboeckia 391 14. Gen. Axelboeckia Stebh. 1894 Boeckia (Sp. un.: B. spinosa) (non A. W. Malm 1871)), (O. Grimm in MS.) G. O. Sars in: Bull. Ae. St.-Pötersb., ser.5 v.1 p.182 | 1899 Axelboeckia, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 423. Integument crustaceous, body robust, with median and marginal carinae, pleon segments 5 and 6 small. Head rostrate. Side-plates 1 and 4 shorter than 24 or 34, 4th not very broad, nor much emarginate behind. Antenna 1 the longer, with accessory flagellum. Mouth-parts nearly as in Gammarus (p. 460), but apex of upper lip scarcely emarginate, lower lip with broad principal lobes separated by rudiments of inner lobes. Maxilla 1 on right has apex of palp expanded, denticulate, on left narrower, with a few slender spines. Maxillipeds, 34 joint of palp distally expanded. Gnathopods l and 2 nearly alike, small, subchelate, stronger in J than in ©. Peraeopods 1—5 differing little in length. Peraeopods 3 and 4, 24 joint narrow. Peraeopod 5, 24 joint broadly expanded. Branchial vesicles broad, with narrow attachment. Uropods 1—3 successivelv smaller. Uropod 3 short, peduncle short, outer ramus l1-jointed, inner shorter. Telson very small, unarmed, not deeply cleft. 2 species. Synopsis of species: Antenna 1, accessory flagellum 1-jointed . ». »..... 1. A.spinosa . . p.391 Antenna 1, accessory flagellum with more than 1 joint. . 2. A. carpenterii. p. 392 1. A. spinosa (O. Sars) 1894 Boeckia s. (B. nasuta, B. hystrix), (0. Grimm in MS.) G.O. Sars in: Bull, Ac. St.-Petersb., ser.5 v.1 p.183 t.1, 2 | 1899 Axelboeckia ’s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 424. Body extremely stout in Q, less so in d. Back obtusely carinate throughout, peraeon segments each with spiniform process on each side near side-plates, in segment 5 very large, acute, the others smaller and rather obtuse; pleon segments I—4 with a pair of subdorsal, upturned processes, segment 4 overlapping 5: and 6th, and ending in a rather large, hooked, median projeetion. Young speeimens have all processes of head and body digitiform, ending obtusely, and the dorsal prominences more strongly elevated, giving the back a serrated appearance Head slightly keeled, rostrum horizontal, forming an equilateral triangle, lateral lobes acute, longer than rostrum, diverging nearly at a right angle. Side-plate 1 setose, curved forward, 4 obliquely truncate below emargination. Pleon segment 3, postero-lateral angles obtusely quadrate. Eyes small, rounded, dark, wide apart. Antenna 1 not long. 1° joint as long as 24 and 3% combined, 3% nearly as long as 24, flagellum twice as long as peduncle, with about 25 short, setose Joints, accessory flagellum an extremely small nodule, carrying 2 setules. Antenna 2 much shorter, bent back, ultimate joint of pedunele shorter than penultimate, flagellum 9-jointed. Gnathopods 1 and 2 in J, 6" joint much wider than 5%, hind margin armed with forward curving spines and forming a broadly rounded lobe where it meets the deeply eoncave palm, finger strongly curved, impinging within the lobe. Gnathopods 1 and 2 in © comparatively small, 6% joint about as long as 5t", and scarcely broader, palm in gnathopod 1 somewhat oblique, in gnathopod 2 nearly transverse, finger not strong, matching palm. Peraeopods 3 and 4 rather longer than the rest, 24 joint little expanded, slightly tapering distally. Peraeopod 5, 24 joint nearly straight in front, strongly expanded behind with curved hind 392 Axelboeckia, Brachyuropus margin. Uropod 1 much the longest, rami subequal, slightly longer than peduncle. Uropod 2, rami subequal, longer than peduncle. Uropods 1—3 very slightly armed. Telson extremely small, broadly triangular, length not half the breadth, incision about to the middle, apices rounded. L. C@ 25, Q 20 mm. Jaspian Sea. Depth 13—282 m. 2. A. carpenterii (Dyb.) 1874 Gammarus c., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p. 113 t.13 f.2 | 1899 Axelboeckia c., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7. p.424 | 1893 Amathilla homari (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. All segments with a median carina, low and divided by a transverse depression; all segments with hind margin more or less thickened, the thiekening on peraeon segments 1—3 and pleon segments 1—3 carrying very small -tubereles, representatives of lateral carinae; all segments with marginal swellings, stronger and more earina-like on peraeon segments 1—3 than on any others; the various elevations feebly developed on pleon segments 4—6. Head, rostrum long, acute, slightly deflexed, with carina-like compression below; upper surface of head separated from the cheeks by weak ridge-like elevations, and grooved with a furrow continued along the rostrum. Side- plates 1—4 very deep and obliquely outward and downward directed, owing to the breadth and flatness of the body. Eyes moderately large, prominent, biseuit-shaped, black. Antenna 1 about ’/, as long as body, and about /, longer than antenna 2, peduncle stouter and usually longer than peduncle of antenna 2, 34 joint longer than 24, in d flagellum with 12 joints, accessory flagellum with 2; antenna 2, flagellum with 4 joints; but in (much longer) Q antenna 1, flagellum with 20—29, accessory flagellum with 4 or 5, antenna 2, flagellum with 7 or 8 joints. Gmathopods 1 and 2, 5th joint short, 6! joint broad, oblong, that of gnathopod 1 somewhat larger than that of gnathopod 2 (in figure equal in size), the length little greater than the breadth, which enereases to the palm, this being oblique, well defined, subequal to the hind margin. Peraeopods 3—5, 24 joint not broad, hind margin feebly convex, with few but rather long setae. Uropods 1 and 2 reaching end of uropod 3 or rather beyond. Uropod 3 '/,, as long as body, inner ramus about °/, as long as outer, with simple setae, outer with a few plumose setae on inner margin. Telson eleft almost to centre (in figure less than "/, of length). Colour brown or yellow. L. 9 11, 0 24—31 mm. Lake Baikal. Depth 50—300 m. 15. Gen. Brachyuropus Stebb. 1899 Brachyuropus, T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p. 424. With median dentate carina. Side-plate 4 with projecting tooth. Antenna 1 much the longer, accessory flagellum long. Gnathopods 1 and 2 similar, subchelate. Peraeopods 3—5 elongate. Uropods 1 and 2 elongate. Uropod 3 rudimentary, rami very unequal. Telson apically emarginate. 2 species. Synopsis of species: Projeeting tooth of side-plate 4 compressed, direeted obliquely dowawarl ...... u sr oem 1. B.grewingkü . p.393 Projecting tooth ofside-plate 4rounded, direeted horizontally OBERE. 570 nn N EEE, 2. B. reichertii . . p.398 nee urrz Den a a E 2 12 4 E Pi 43 3 % J R 4 Brachyuropus 393 1. B. grewingkii (Dyb.) 1874 Gammarus g., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 150 t.2 f.4 | 1893 Orangony«&? g., A. Della Valle in: F. Fl. Neapel, v.20 p.928 | 1899 Brachyuropus g., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.424. Median dorsal carina represented on all segments, except pleon seg- ments 4—6 or 5 and 6, by strong teeth, usually strongest on peraeon seg- ments 5—7 and pleon segments 1 and 2, all, and especially those on pleon segments 1—3, laterally strongly compressed, hinder pleon segments dorsally rounded and completely smooth. Lateral marginal carinae on peraeon seg- ments weak, tubereular (a variety with double series of small tubereles on peraeon segments 6 and 7 and pleon segments 1—3). Head, surface rough, rostrum short, obtusely pointed; behind the eye from the cheek projects a long, pointed, obliquely outward and forward direeted tooth. Side-plates 1—4 more or less deeply emarginate below between 2 acute points, the hinder longest. Side-plate 4 on lower part of its surface provided with a down- ward and backward direeted, strong, pointed, flattened tooth, reaching far over its hind angle. Pleon segments 1—3, postero-lateral angles acute (in figure rounded). Eyes weakly developed, white, dimly showing through the pellueid integument, sometimes not discernible at all. Antenna 1 more than half aslong asbody, about thriceas long as antenna 2, flagellum with more than 60 joints, accessory flagellum 22-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 14-jointed. Gnathopods 1 and 2, 5t% joint short, 6! piriform, narrowing to the finger hinge, palm very oblique, much longer than hind margin, defined by a spine, and having a prominent spine near the middle (in figure); this joint (in figure) is longer in gnathopod 1 than in gnathopod 2. Peraeopods 3—5, 29 joint narrowly heart-shaped (in figure; narrowly oblong, a little widenel proximally), without setae on hind margin. Peraeopod 4 as long as body. Peraeopod 5 subequal to peraeopod 4 (in figure). Uropods 1 and 2 strongly developed, reaching about equally far, rami thickly fringed with simple setae. Uropod 3 searcely /,;,—"s, a8 long as body, outer ramus fringed with simple setae, 3—5 times as long as inner, which has only an apical seta. Telson broader than long, with convex margins narrowing to a shallowly emarginate apex, with angles only subaeute. Colour dark horn-yellow to yellowish white. L. reaching 66 mm. | Lake Baikal. Depth 100—1000 m. 2. B. reichertii (Dyb.) 1874 Gammarus r., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 42, 152 t.13 f.4 | 1893 Orangonyx reicherti, A. Della Valle in: F. Fl. Neapel, v.20 p. 930 | 1899 Brachyuropus reicherti, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 424. Median dorsal carina as in B. grewingkii, but the teeth higher, more acute, less compressed, longest on pleon segments 1 and 2; peraeon segments 1—4 with single weak lateral carina, segments 5—7 with lateral row of little roundish tubercles, and marginal prominences carina-like, tubereulate in the middle ; pleon segments 1—3 with lateral tubereles on hind margin. Head, surface rough, rostrum a short, blunt hump; from the cheek projects forward, outward, and upward a slightly bent tooth. Side-plates 1---4 below shallowly emarginate, the angles blunt and short. From the surface of side- plate 4, and nearly at right angles to it, a very long, rounded tooth is directed horizontally outward. Distance between apices of this pair of teeth equal to 21/,—3 times greatest breadth of body without the teeth. Pleon segments 1—3, postero-lateral angles rounded. Eyes as in B. grewingkii. Antenna 1°), as long as body, 3—4 times as long as antenna 2, flagellum 46-jointed, accessory flagellum 12-jointed. Antenna 2, ultimate joint of peduncle shorter 394 Brachyuropus, Macroheetopus than penultimate, flagellum 8-jointed. Gmathopod 1 as in B. grewingki; gnathopod 2 smaller, narrowing less, palm (in figure) shorter than hind margin. Peraeopod 3 not much shorter than the body. Uropods I and 2, rami scantily fringed with setae. Uropod 3 less than "/,, as long as body, outer ramus 2—3 times as long as inner, both having only apical setae. Telson two- pointed, i. e. with acute angles to the emarginate apex. Colour whitish or yellow. L. 32 mm. Lake Baikal. Depth 200—500 m. 16. Gen. Macrohectopus Stebb.*) 1874 Constantia (non A. Adams 1860, Mollusca!), Costantia (laps.), B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 50, 51, 186 | 1888 Costantia, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 427, 428. Peraeon smooth, pleon carinate. Head not rostrate. Side-plates all very small and shallow, apparently the 24 deepest, the 6! widest. Antenna 1 longer and stronger than antenna 2, peduncle very long, 39 joint longest, accessory flagellum wanting. Mouth-parts (so far as known) as in Gammarus (p. 460). Gnathopods 1 and 2 slender, feebly subchelate, 5t" joint longer than 6t%, Peraeopods 1—5 very slender, peraeopod 4 much the longest, 24 joint little expanded. Uropod 1 much the longest. Uropods 1 and 2, outer ramus much shorter than inner. Uropod 3, rami long, lanceolate, equal, 1-jointed, fringed with plumose setae. Telson long, divided. 1 species. 1. M. branickii (Dyb.) 1874 Constantia b. + ©. b. var. alexandri, B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p. 186 t.5 f.7; p.187 t.3 f.6 | 1888 Cosiantia b., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1696 | 1893 Pontogeneia (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 891. Body slender. Pleon segment 1 with weak median carina running out to a long, horn-like, upward projecting and slightly forward bent tooth (in vor, alexandri directed straight backward). Pleon segments 2 and 3 with median carina much stronger, but tooth directed straight backward and insignificant. Head, front somewhat depressed. Side-plates so small and shallow that the branchial vesieles and marsupial plates in a lateral view are exposed. Pleon segments 1—3, postero-lateral corners (in figure) rounded. Eyes rather large, narrowly reniform, black. Antenna 1 about ?/, as long as body, flagellum shorter than peduncle, witi 23—56 joints. Antenna 2 very slender, ultimate and penultimate joints of pedunele long, subequal, flagellum with 12—22 joints, setiferous as in antenna 1. Gmathopods 1 and 2 subequal, 5th joint almost twice as long as 6! (in figure subequal to it), 6! joint narrowly oval, palm feebly defined. Peraeopod 1 rather longer than peraeo- pod 2. Peraeopods 3—5, 24 joint short, narrow, not setiferous on hind margin. Peraeopod 4, 4 times as long as peraeopod 3, and twice as long as peraeopod 5. Uropod 1 reaching beyond uropod 3, pedunele long, but inner ramus longer, 5 times as long as the outer (in figure of var. alexandri shorter than peduncle and not much over twice as long as the outer ramus). Uropod 2, inner ramus about twice as long as outer, with plumose setae ‘on inner margin. Colour pellueid. L. © 36 mm. Lake Baikal (only met with swimming). *) Nom. nov. Maxpös, long, exrtog, sixth, molg, foot. — The name Constantia is preoceupied (1860, A. Adams in: Ann. nat. Hist., ser.3 v.5 p.300). The name Costantia is an accidental misspelling. a Er re SEHEN An 2 rn a F EEE a a ae a a Lie u Eh ja Te ee er ie: } Cardiophilus, Brandtia 395 17. Gen. Cardiophilus 0. Sars 1896 Cardiophilus (Sp. un.: C. baeri), G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.4 p.474 | 1899 Caridophilus, J. V. Carus in: Zool. Anz., Regist. 16-20 p.89. Body elongate, smooth. Side-plates 1-4 rather broad. Antenna 1, accessory flagellum very small. Antenna 2 exceedingly small. Upper lip small, rounded. Lower lip without inner lobes. Mandible, eutting plates narrow, spine-row of 3 spines, molar not very powerful, palp large. Maxilla 1, inner plate with 3 plumose setae, outer with dentieulate spines, number not stated, palp weak, of 2 subequal slender joints, the 24 tipped with 2 setules. Maxilla 2 normal, inner plate with setae only on distal half of inner margin. ‘ Maxillipeds normal, except that the finger is rudimentary, tipped with 2 minute setules. Gnathopods 1 and 2 unequal, subchelate, 5th and 6th joints short in gnathopod 1, narrowly elongate in gnathopod 2. Peraeopods 1 and 2, 4*h joint expanded, but not large. Peraeopods 3—5, 24 joint moderately . expanded. Peraeopods 1——-5, finger strong, hooked. Uropod 3 very small, outer ramus with minute 24 joint, inner scale-like. Telson very short, cleft to. the base. 1 species. 1. C. baeri O. Sars 1896 (©. b., @. ©. Sars in: Bull. Ae. St.-Pötersb., ser.5 v4 p- 474 t. 11 £. 13—27. Body extremely slender and elongate, nearly eylindrie, pleon segments 4—6 not long, perfeetly smooth. Head not rostrate, lateral lobes rounded, post-antennal corners subacute. Side plate 1 subquadrate, 4" little emarginate. Pleon segment 3, postero-lateral corners quadrate, but not very sharply. Eyes subrotund, dark. Antenna 1 about !/, as long as body, pedunele short, 1° joint longer than 2° and 34 combined, flagellum 10-jointed, accessory flagellum extremely small, with 2 joints, 24 minute. Antenna 2 scarcely half as long, ultimate joint of pedunele rather shorter than penultimate, flagellum 4-jointed. Gnathopod 1, 5tk joint subequal to 6%, 6th oval quadrangular, slightly narrowed distally, palm nearly transverse. Gnathopod 2 much longer, 5! joint fully as long as 6!" and distally wider, 6!" narrow, palm very short, transverse. Peraeopods 3—5, 24 joint oblong oval, slightly narrowed below, little differing in peraeopod 5 from that in peraeopod 4. Uropods 1 and 2 rather stout, rami subequal, having at the apex several spines, some of them hooked. Uropod 3 searcely at all projeetingy beyond uropod 1, outer ramus scarcely longer than peduncle, furnished with a few setules, inner ramus with 1 apical seta. Telson twice as broad as long, almost semieircular, each lobe with a small apical and 2 lateral hairs. L. © 5'5 mm. Caspian Sea. pr 18. Gen. Brandtia Bate 1862 Brandtia (Sp. un.: B.latissima), Bate, Cat. Amphip. Brit. Mus., p. 129. A median tubercular carina on at least some of the segments of peraeon and pleon; marginal carinae more or less developed. Antenna 1 longer, but seldom much longer and in J sometimes shorter than antenna 2, accessory flagellym 1-jointed. Mouth-parts nearly as in Gammarus (p. 460), at least in B. lata. Upper lip rounded. Lower lip without inner lobes. Maxilla 1, inner plate with numerous setae, outer with 11 spines. Peraeopod 5, 24 joint moderately expanded. Uropod 3 short. Telson deeply cleft. 6 species. 396 Brandtia Synopsis of species: Median carina on all segments of peraeon —- 2. 1 | Median carina only on last 2 or 3 segments of peraeon — 3. 2 j Median carina of pleon segment 1 carrying 2 spines 1. B.lata. .... p- 396 \ Median carina of pleon segment 1 devoid of spines 2. B. latissima . . p.396 3 j Uropod 1 reaching beyond uropod 3 — 4. \ Uropod 1 not reaching beyond uropod 3 —- 5. | Uropod 3, outer ramus twice as long as inner . . 3. B. tuberculata . p. 397 ® | Uropod 3, outer ramus not twice as long as inner 4. B. morawitzii . p. 397 f Uropod3, inner ramus more than half as long as outer 5. B. smaragdina . p. 398 \ Uropod 3, inner ramus less than half as long as outer 6. B. fasciata . . . p.398 1. B.lata (Dyb.) 1874 Gammarus latus, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.159 t.4 f.5 | 1893 Atylus? l., A. Della Valle in: F. Fl. Neapel, 0.20 p. 929 1899 Brandtia lata, T. Stebbing in: Tr. Linn. Soe. London, ser. 2 ©.7 p. 424. Back of peraeon flatly roof-shaped, median carina throughout, tuber- ceular, on segment 1 carrying 1 or 2 backward bent spines; marginal carinae strongly developed, obtusely projecting immediately over the side-plates; on pleon segments 1—3 the median tubercular carina carries on segment 1 in d 2, in © 4 spines, on segments 2 and 3 of both sexes 4 forward direeted spines; corresponding to the marginal carinae of peraeon are small, slightly. curved elevations; pleon segments 4—6 arched, without carinae. Head, front with tip-tilted rostrum, carrying 2 backward pointing spines, top of head surmounted by 4 humps each carrying a backward directed spine; an acute spine projecting from lower margin of each cheek. Side- plates 1—4 setiferous, 1—3 carinate. Lateral compression of body greatest at lower part of side-plates. Eyes prominent, oval or reniform, black. Antenna 1 not long, in J little, in Q eonsiderably, longer than antenna 2, 1° joint with hump near distal end above, flagellum 17—19 - jointed. Antenna 2, flagellum 7—9-jointed. Gnathopods 1 and 2 subequal, 6th joint oblong, but in gnathopod 1 with more oblique palm, which is armed with 1 large and 2 small spines. Peraeopods 3—5, 24 joint heart- shaped, with 11—15 rather long setae on hind margin. Uropod 3 smaller in Q than in d, rami nearly equal, ending in simple setae longer than the rami, with delicate plumose setae on the inner margin. Telson broader than long, cleft nearly to the base, with small setules on the rounded apices. Colour brownish yellow to brownish green, sometimes with a bright mark across end of peraeon. L. 17—20 mm. Lake Baikal. Depth 2—-20 m. 2. B. latissima (Gerstf.) 1858 Gammarus latissimus, Gerstfeldt in: Mem, pres. Ac. St.-Pötersb., v.8 p.288 | 1862 Brandtia latissima, Bate, Cat. Amphip. Brit. Mus., p. 129 1.23 f£.5,6 | 1893 Pontogeneia? l., A. Della Valle in: F. Fl. Neapel, v.20 p.616, 929 1874 Gammarus latissimus + @.latior, B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p. 161; p. 158 t.4 f. 6. General shape as in B. lata, median carina strongly developod, on pleon segments 2 and 3 carrying 3-—-4 pairs of spines, but none on segment 1; on pleon segment 3 the spines of the last pair almost on the hind margin and almost twice as far asunder as those of the other pairs, the same being the case on segment 2 only when the 4b pair of spines is developed. Marginal carina on each of peraeon segments carrying a short spine, this carina ein and un El 172, 32 10T SE 9" 22.20 on BE Ei. 3 Br ra nn tn ln nl a Bd Brandtia 397 represented by lateral swellings on pleon segments 1—3; pleon segments 4—6 much longer than in B. lata. Head with spines as in B. lata and 2 additional lateral pairs. Side-plates 1—4 all carinate, but not setiferous. Eyes prominent, oval or reniform, black. Antennae 1 and 2 in general as in B. lata, but 1° joint of antenna 1 with 2 humps in line, the front one armed with 2 backward direeted spines, flagellum with 15—27 joints, of which in the S the 3%, in the © the 4" is longest. Gmathopods 1 and 2 subequal, 6% joint slender, with slightly convex margins (Dybowsky), in gnathopod 1 6%% joint more elongate, in gnathopod 2 more rhomboidal, with palm more obliquely truncate (Gerstfeldt). Peraeopods 3—5, 2 joint heart-shaped, narrower than in B. lata, with extremely short, distant, setae on hind margin. Uropod 3 shorter in Q than in C, but never rudimentary. Colour in general greenish brown, parts of head and peraeon brighter. L. 19—27 mm. Lake Baikal, River Angara. 3. B. tuberculata (Dyb.) 1874 Gammarus tuberculatus, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 161 | 1893 Atylus? t., A. Della Valle in: F. Fl. Neapel, v.20 p.981 | 1899 Brandtia tuberculata, T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.424. The median carina weakly developed as longish tubereles on peraeon segments 6 and 7 and pleon segments 1—3; marginal carina represented by a rounded, smooth, not very prominent swelling immediately over the side-plates of all peraeon segments and pleon segments 1—3.” Head, rostrum a short - obtuse point. Side-plates I—4 yetiferous. Eyes round oval, broader below than above, black. Antenna 1 less than '/, as long as body, twice as long as antenna 2, 1° joint broad, flagellum 24-jointed. Antenna 2, flagellum zus Gnathopods 1 and 2 subequal, 6% joint piriform, palm defined by 3 spines, finger long, slightly bent. Peraeopods 3 and 4, 24 joint expanded above, all the hind margin beset with rather long setae. Peraeopod 3, 24 joint greatly widened below. Uropods 1 and 2 reach beyond uropod 3, which is very short, outer ramus twice as long as inner, with 3—7 spines on apex and 2 on outer margin, inner ramus with only 2 spines, both apical. Telson divided. Colour greyish white or elear brown, with narrow dark stripes across the segments. L. 16 mm. Lake Baikal. Litoral. 4. B. morawitzii (Dyb.) 1874 Gammarus .m., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 163 | 1893 Atylus? m., A. Della Valle in: F. Fl. Neapel, v.20 p: 929 | 1899 Brandtia m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 424. Median carina distinet on the convex peraeon segments 6 and 7 and pleon segments 1—3; spines on pleon segments 5 and 6 extremely delicate; whether marginal carinae are present or absent is not stated. Head, rostrum broad, rounded, little advanced. Side-plates 1—4 setiferous. Eyes moderately large, roundish, convex, black or dark red. Antenna 1 rather more than !/, as long as body, and about '/, longer than antenna 2, 1° joint stout, flagellum 14—18-jointed. Antenna 2, flagellum with 7 or 8 joints. Gmathopods 1 and 2 small, slender, 6% joint oval in gnathopod 1, oblong in gnathopod 2. Peraeopod 3, 24 joint on upper margin strongly rounded. Peraeopod 4, 24 joint heart-shaped. Peraeopod 5, 24 joint broader than in peraeopods 3 and 4, hind margin evenly rounded. Uropod 3 extremely short, outer ramus scarcely longer than peduncle, 1-jointed, with 4 spines on apex, 2 on outer margin; inner ramus °/, as long as outer, with 1—3 apical spines. Each half of telson 398 Brandtia, Mieruropus like a cone with broad base. Colour greyish white, sometimes dark longitudinal stripe on the back. L. 10 mm. Lake Baikal. Depth 20 m. 5. B.smaragdina (Dyb.) 1874 Gammarus smaragdinus + @. s. var. intermedius. B. Dybowsky in: Horae Soc. ent. Ross., ©. 10 suppl. p. 164 t. 11 f.6 | 1895 Atylus? s., A. Della Valle in: F. Fl. Neapel, v.20 p. 930 | 1899 Brandtia smaragdina, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 424. Shows some affınity to Cardiophilus (p. 395). Sexual variation very marked. Body stouter in 9 than in d. Median carina on peraeon segments 6 and 7 and pleon segments 1—3 consisting of long tubereles of little prominence; pleon segments 4—6 carrying 2 or 3 little groups of very delicate spines; marginal carinae not mentioned. Head, rostrum rounded, depressed. Side-plates 1—4 with marginal setae. Eyes convex, reniform, black. Antenna 1 in C as long - as body, 4 times as long as antenna 2, in Q half as long as body, twice as long as antenna 2, 1 joint stout, flagellum in © with 44, in Q with 34 joints. Antenna 2, flagellum 8-jointed. Gmnathopods 1 and 2, 6 joint oval, in S that of gnathopod 1 somewhat the larger. Peraeopods 3—5, 24 joint moderately broad, most expanded in peraeopod 5, with hind margin and surface setiferous and margin also spinose. Uropod 3 short, longer in S than in 9, outer ramus Y,—"/; longer than inner, in S with plumose setae on inner margin, on outer and apex with spines and simple setae; in Q with 2 spines on outer margin, on inner with 2 or 3 setae, at apex with spines and setae, inner ramus carrying only setae. Telson divided. Colour emerald-green (var. intermedius whitish; it has in © smaller eyes, shorter antennae, and shows some minute differences in the uropod 3). L. 11—12 mm. Lake Baikal. Depth 50—100 m (var. intermedius at 15 m). 6. B. fasceiata Stebb. 1874 Gammarus zebra (non Rathke 1843!), B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 166 t.14 f.7 | 1893 Atylus? z., A. Della Valle in: F. Fl. Neapel, v.20 p. 931 | 1899 Brandtia faseiata, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 424. Peraeon segments 5—7 or 6 and 7 and pleon segments 1—3 carinate or provided with little tubereles in the median dorsal line; pleon segments 4—6 very convex, with very delicate spine-points or setae. Head, rostrum short, slightly depressed. Side-plates 1—4 scantily setiferous. Eyes reniform, black. Antenna 1 very little longer than antenna 2, '/,—'/, as long as body, 1° joint rather broad, slightly flattened, flagellum 10—13-jointed. Antenna 2, flagellum 5—7-jointed. Gmathopods 1 and 2 subequal, 6'"% joint oblong, palm shorter and less oblique in gnathopod 2. Peraeopod 5, 24 joint trapezoidal, with the corners rounded, broadest below, much broader and longer than the corresponding joint of peraeopods 3 and 4. Uropod 3 short, outer ramus with small 24 joint, in length about 4 times as long as the inner ramus, with 4 spines and several setae on outer margin, simple setae on the inner, spines and setae at the apex, the inner ramus with 1 long apical seta. Telson divided. Colour greenish brown, with dark brown or black stripe across -each segment. L. 17 mm. Lake Baikal. At river mouths, ascending the streams in swarms. 19. Gen. Micruropus Stebb. 1899 Micruropus, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 424. Without carinae or overarching segments. Antennae 1 and 2 short; antenna 1 usually longer than antenna 2, the peduneles not greatly differing nn I ha a a De eh A N IR SER EETRTERRNE EN A06-277 0 ee Da ATI DE Ba ET a Micruropus 399 in length, accessory flagellum 1-jointed. Gnathopods 1 and 2, 6! joint not greatly differing in size. Uropod 3 small or very small, rami unequal, outer ramus usually 1-jointed. Telson cleft. 12 species. Synopsis of species: 1 All segments dorsally unarmed — 2. Some segments with dorsal setules or spinules — 3. Eyes rather large; uropod 1 not reaching beyond 2 | a NR 1. M. puella . . . p.399 Eyes very small; uropod 1 reaching beyond uropod3 2. M.inflatus . . p.399 All segments anterior to pleon segment 4 dorsally 4 smooth —- 4. Some segments anterior to pleon segment 4 dorsally armed — 5. j Uropod 1 not reaching beyond middle of uropod 3 3. M. vortex. . - p.400 “ 1 Uropod 1 reaching end of uropod 3... .. .. "4. M. talitroides . p. 400 & ntenna l, peduncle shorter than In antenna 2 — 6. A 1, pedunele shorter than i te 2—6 * \ Antenna 1, pedunele not shorter than in antenna 2 — 7. ’ pP | Antenna 1 shorter than antenna 2; uropod 3, inner | ramus half as long as outer... ......- 5. M. littoralis . . p.401 Antenna 1 longer than antenna 2; uropod 3, inner ramus scarcely !/; as long as outer. . . . -. . 6. M.glaber.. . . p.401 f Peraeon dorsally minutely granular ....... 7. M. rugosus . . p.402 \ Peraeon dorsally smooth — 8. 8 Antennaeland2, ingand 2, flagellum with caleeoli 8. M. wahlii . . . p.402 Antennae 1 and 2, flagellum without calceoli — 9. 'g j Antenna 1 longer than antenna 2 — 10. \ Antenna 1 not longer than antenna 2 — 11. 10. j Uropod 3, inner ramus nearly as long as outer... 9. M. fixsenii . . p.402 \ Uropod 3, inner ramus only half as long as outer 10. M. perla . „ . p.408 u j Gnathopod 2, 6th joint piriform. . ...... - 11. M.klukü . . . p.408 \ Gnathopod 2, 6th joint oblong . ... ..... 12. M. pachytus. . p.404 1. M. puella (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross.. v.10 suppl. p. 48, 175 | 1893 Atylus? p., A. Della Valle in: F. Fl. Neapel, v. 20 p. 930 | 1899 Mieruropus p., T.. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 424. All segments dorsally completely smooth and level. Side-plates 1—4 each with 3—5 setules. Eyes rather large, reniform, ruby-red. Antenna 1 °/, as long as body, more than twice as long as antenna 2, peduncle a little longer than pedunele of antenna 2, flagellum 12—14-jointed. Antenna 2, flagellum with 3 or 4 joints. Gmnathopod 1, 6" joint piriform, in 9 larger than the oblong 6t" joint of gnathopod 2. Peraeopods 3—5, 2° joint broad, rather convex in front, strongly widened behind, the almost semieireular wing ending below in a short rounded lobe, setules on both margins. Uropod 1 reaching end of uropod 3. Uropod 3 '/,, or "/s as long as body, outer ramus 2-jointed, 24 joimt '/, as long as 1°, with 2 apical setae, 1° joint with 1 marginal spine and 2 apical spines; inner ramus */, as long as outer, with 2 apical setae. Telson celeft. Colour white. L. 5—6 mm. Lake Baikal. Depth 100 m. -2. M. inflatus (Dyb.) 1874 Gammarus i., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl: p.169 t.12 f.4 | 1893 Atylus?i., A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1899 Micruropus i., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.424. 400 Miecruropus All segments dorsally smooth. Side-plates 1—4 with setae. Eyes very small, punetiform, black. Antenna 1 half as long as body, twice as long as antenna 2, longer than in other species of this genus, flagellum more than twice as long as peduncle, 23-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 9-jointed. Gnathopods 1 and 2, 6th joint piriform, little larger in gnathopod 1 than in gnathopod 2, palm very long and oblique, finger long, curved. Peraeopods 3—5, 24 joint with numerous fascicles of setae at the strongly convex lower front corner, upper hinder part in peraeopods 3 and 4 with broad winglike expansion, hind margin with long setae; peraeopod 5 very broad, evenly expanded behind, setose on both margins. Uropods 1 and 2 reaching much beyond uropod 3. Uropod 3 very short, scarcely '/,, as long as body, outer ramus about twice as long as inner, with 3 apical and 2 pairs of marginal spines, inner with 2 marginal spines and 1 or 2 apical setae. Telson broader than long, cleft to base, lobes conical, divergent. L. about 20 mm. Lake Baikal. Depth 2—10 m. "3. M. vortex (Dyb.) 1874 Gammarus v., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.178 t.9 f.4 | 1899 Miceruropus v., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.424 | 1898 Gammarus pungens (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 931. Pleon segments 4—-6 with 3 groups of delicate dorsal spines and setae, the number of setae small and variable; other segments smooth. Side-plates 1—4 with isolated setae. Eyes of moderate size, reniform, black. Antenna 1 about '/, as long as body, a little longer than antenna 2, pedunele a little shorter than pedunele of antenna 2, but in Q sometimes longer, flagellum 9—-16-jointed. Antenna 2, flagellum with 5—9 joints, calceoliferous only in the d. Gmathopod 1, 6!" joint piriform, as long as the oblong 6! joint of gnathopod 2, but (in figure) less bulky. Peraeopods 1 and 2, finger with a strong spine on inner margin adjacent to the nail. Peraeopod 3, 24 joint slightly convex in front, the wing-like expansion produced somewhat down- ward in a lobe-like rounded corner. Peraeopods 4 and 5, 24 joint heart- shaped, wide above, narrowed below, differing from the form usual in this group, hind margin fringed with long setae. Uropods 1 and 2 scarcely reaching middle of uropod 3. Uropod 3 about !/, as long as body, therefore rather distinet from rest of genus, outer ramus 2-jointed, inner only '/, or !/, as long, both with plumose setae on inner margin. Telson cleft. Colour greenish. 1. 0 10, 9 6—7 mm. Lake Baikal. Depth 5—80 m; on stony coasts. 4. M. talitroides (Dyb.) 1874 Gammarus t., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.47,171 t.14 f.3 | 1893 Atylus? t., A. Della Valle in: F. Fl. Neapel, v.20 p.930 | 1899 Mieruropus t., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.424. Pleon segments 5 and 6 with short, delicate, dorsal spinules, other segments smooth. Head, rostrum somewhat prominent, curved, bluntly rounded. Side-plates 1-——4 with setae. Eyes not large, reniform, brownish black. Antenna 1 about '/, as long as body, about '/, longer than antenna 2, but with rather shorter peduncle in C, flagellum 14—18-jointed. Antenna 2, flagellum with 7 joints, ealceoliferous only in d. Gnathopod 1, 6% joint rather shorter and deceidedly narrower than the oblong 6'% joint of gnathopod 2, described as piriform, but in figure the palm is shorter than hind margin, and, though very oblique, well defined. Peraeopods 3 and 4, 24 joint with convex, strongly setose, lower front corner, hinder expansion setose, rounded Mieruropus 401 above, narrowed below. Peraeopod 5, 24 joint setose as in preceding peraeo- pods, but longer and somewhat broader, hinder expansion narrower than musele-bearing part. Uropod 1 reaching end of uropod 3. Uropod 3 "3 — "is as long as body, outer ramus 1l-jointed, /,—?/, longer than inner, with ' 2 pairs of strong spines on outer margin, both rami having long apical setae. Telson cleft to base, each half (in figure) with 3 apical spinules. Colour yellowish or greenish grey; front margin of head and side-plates 1—3, side- plate 4, 24 joint of peraeopods 3—5, uropod 3 and telson, brownish black. L. 11 mm. rös Baikal. . M. littoralis (Dyb.) 1874 Gammarus l., B. Dybowsky in: Horae Soe. ent. Ross., v, sis suppl. p. 168 t.14 f.2 | 1893 Atylus? I., A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1899 Micruropus l., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.424. Peraeon segments 6 and 7 and pleon segments 1—3 with dorsal setae, pleon segments 4+—6 with groups of delicate spines arranged on upper curvature of the segments. Head, rostrum obtusely pointed. Side-plates 1—4 with few marginal setae. Eyes small, rounded reniform, wide apart, black, Antenna 1 (usually) shorter and with shorter pedunele than antenna 2, scarcely '/, as long as body, 1° joint stout, longer than 24 and 34 combined, flagellum 8-jointed, accessory flagellum 1-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, flagellum 5--7-jointed. Gmathopod 1, 6!" joint piriform, longer but narrower than the oblong 6 joint of gnathopod 2, palm concave, very oblique. Peraeopods 3 and 4 with lower front corner of 94 joint strongly convex and setose; peraeopod 5 as in M. inflatus (p. 399). Uropod 1 (not uropod 2) reaching end of uropod 3. Uropod 3 scarcely !/,» as long as body, outer ramus about twiee as long as inner, with 4 or 5 apical and 2 marginal spines and as many setae, inner with only a long apical seta. Telson broader than long, not eleft to the base, lobes conically divergent, tipped with spinules. Colour white. L. about 10 mm. Lake Baikal. 6. M. glaber (Dyb.) 1874 Gammarus g., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.176 t.14 f.6 | 1893 Atylus? g., A. Della Valle in: F. Fl. Neapel, v.20 p. 928 | 1899 Micruropus g., T. Stebbing in: Tr. Lin. Soc. London, ser.2 v.7 p. 424. Peraeon segments 6 and 7 each with 2 long setae on hind margin, pleon segments 1-4 with long, isolated setae on the whole upper surface, segments 5 and 6 with groups of delicate spinules. Head, rostrum a slightly depressed, rounded point. Side-plates 1—4 with isolated setae. Eyes of moderate size, rounded reniform, black. Antenna 1 about '/, as long as body, about '/, longer than antenna 2, but with pedunele rather shorter, flagellum 11-jointed. Antenna 2, ultimate and penultimate joints of peduncle equal, flagellum 4-jointed. Gnathopod 1, 6% joint in JS larger than oblong 6% joint of gnathopod 2, which it much resembles in shape, but that the much more oblique palm adds to its length, the part bounded by the hind margin being in both gnathopods oblong. Peraeopods 3—5, 24 joint with lower front cormer little or not at all inflated, but setose; in peraeopod 5 this joint is trapezoidal, with numerous and long setae on hind margin. ‚Uropods 1 and 2 reaching last fourth of outer ramus of uropod 3. Uropod 3 about '/, as long as body, outer ramus with apical spines and setae, 1 spine on inner margin, 2 pairs of spines on outer, inner ramus scarcely '/, as long as outer, with 1 apical seta. Telson cleft to base, lobes conical, with some armature. Colour white. L. 9 mm. Lake Baikal. Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda 1, 26 402 Mieruropus 7. M. rugosus (Dyb.) 1874 Gammarus r., B. Dybowsky in: Horae Soe. ent. Ross., ».10 suppl. p.48, 174 t.14 f.8 | 1893 Atylus? r., A. Della-Valle in: F. Fl. Neapel, v.20 p.930 | 1899 Micruropus r.. T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.424. All peraeon segments and a narrow girdle on head dorsally minutely granular and here and there beset with short setules. Head with short, rounded, rostral point. Side-plates 1—4 setose on lower margin. Eyes small, wide apart, rounded reniform, black. Antenna 1 scarcely '/, as long as body, about '/, longer than antenna 2, peduncle stouter and a little longer than that of antenna 2, 1% joint exceedingly stout, longer than 24 and 34 combined, flagellum rather shorter than pedunele, 10-jointed; accessory flagellum 1-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 8-jointed. Gnathopod 1, 6" joint rather longer and broader than that of gnathopod 2 (oval in gnathopod 1, oblong in gnathopod 2, but in figure very similar), the palm little oblique, well defined, much shorter than hind margin. Peraeopods 3—5, 24 joint at lower front corner fringed with fascicles of stiff setae; in peraeopods 3 and 4 the wing-like. widening behind chiefly on the upper half, in peraeopod 5 the greatest breadth at the lowest quarter. Uropods 1 and 2 reaching beyond uropod 3. Uropod 3 '/,, as long as body, outer ramus 1-jointed, as long as pedunele, with 3 apical spines and 2 in middle of outer margin, inner ramus about half as long, with 1 long apical seta. Telson (in figure) nearly twice as broad as long, celeft not nearly to the base, a seta on each divergent apex. Colour brownish white. L. 9 mm. Lake Baikal. 8. M. wahlii (Dyb.) 1874 Gammarus w. + @. w. var. platycercus, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.179; p.180 | 1893 Atylus? w., A. Della Valle in: F. Fl. Neapel, v.20 p.931 | 1899 Micruropus w., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.424. Pleon segments 4—6 each with 3 groups of spinules, 2 or 3 in each group on segments 4 and 5, only 1 or 2 in each on segment 6. Side-plates 1—4 with setae. Eyes moderately large, reniform, black. Antenna 1 less than '/, as long as body, usually rather shorter than antenna 2, in var. plaiycercus rather longer, peduncle stouter but shorter, 1% joint stout, flagellum with 21—27 joints (in var, with 43). Antenna 2, flagellum with 21—27 joints (in var. with 31—43), as in antenna 1 furnished with calceoli (in antenna 2 smaller in oO than in 9). Gmathopods 1 and 2 with 6" joint of same size, piriform in gnathopod 1, oblong in gnathopod 2. Peraeopods 3 and 4, 24 joint little inflated at the setose lower front corner, hind margin closely set with long setae. Peraeopod 5, 24 joint broad, broadest in the upper half, with long setae on the hind margin. Uropod 3 '/,, as long as body, reaching beyond the others, outer ramus 4 times as long as the inner, with plumose setae on inner margin, 2 pairs of spines and simple setae on the outer, 24 joint short (not found in var.); inner ramus with 2 plumose setae on inner margin and a long apical seta. Telson divided. Colour greenish white. L. 11 mm. Lake Baikal (mouth of the river Sljudianka). 9. M. fixsenii (Dyb.) 1874 Gammarus f., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p. 172 | 1893 Atylus? f., A. Della Valle in: F. Fl. Neapel, v.20 p.928 | 1899 Micruropus f., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 424. Pleon segments 1—6 each with 2 delicate setae on hind margin, otherwise upper surface of body quite smooth and even. Head, upper profile strongly convex, rostrum depressed, beak-like. Side-plates 1--4 with setae. Mieruropus 403 Eyes moderately large, broadly reniform, not prominent, black. Antenna 1 about '/, as long as body, nearly twice as long as antenna 2, but peduncle, though stouter, scarcely longer, flagellum 16-jointed. Antenna 2, flagellum 4- or 5-jointed. Gmnatbopods 1 and 2, 6® joint small, piriform in gnathopod 1, oblong in gnathopod 2. Peraeopods 3 and 4, 24 joint narrow, front margin little convex, with fascieles of long setae, hind margin setose, wing-like expansion very weakly developed. Peraeopod 5, 24 joint very broad, in C only */. longer than broad, lower part of front margin almost monstrously bulging, upper surface of the swelling elosely set with long setae. Uropods 1 and 2 moderately long, in S both reaching beyond uropod 3, in Q uropod 2 somewhat shorter. Uropod 3, outer ramus as long as peduncle, with 2 or 3 apical spines and 4 pairs on outer margin, inner ramus only about '/, shorter, with 2 or 3 apical spines. Telson eleft: Colour white, with a longitudinal dorsal dark stripe. L. about 9 mm. Lake Baikal. 10. M.perla (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.184 | 1893 Atylus? p., A. Della Valle in: F. Fl. Neapel, v.20 p. 929 | 1899 Micruropus p., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v».7 p. 424. Peraeon segments smooth, pleon segments with scattered dorsal setules. Head, rostral point short, rounded, slightly depressed. Side-plates 1—4 with few setae. Eyes punetiform or linear, white, becoming invisible in spirit. Antenna 1 about '/, as long as body and '/, longer than antenna 2, pedunele rather longer than pedunele of antenna 2, 1° joint broad, flagellum rather shorter than pedunele, 7- or 8-jointed, accessory flagellum 1-jointed. Antenna 2, flagellum 4- or 5-jointed. Gnathopod 1, 6!" joint oval, rather larger than the oblong 6!" joint of gnathopod 2. Peraeopods 3—5, lower front corner with fascieles of stiff setae; this joint in peraeopods 3 and 4 very narrow, above broader than below, hind margin sinuous, in peraeopod 5 very broad, wider below than above. Uropod 1 reaching rather beyond uropod 2, both beyond uropod 3. Uropod 3 about '/;,, as long as body, outer ramus shorter than peduncle or equal to it, with 2 or 3 apical spines, inner ramus half as long, sometimes with an apical seta. Telson cleft. Colour white. L. 9 9,9 7 mm. Lake Baikal. Depth 10 m. 11. M. klukii (Dyb.) 1874 Gammarus k., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.181 | 1893 Atylus? k., A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1899 Micruropus k.,.T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.424. Pleon segments 4—6 with 2 or 3 groups of delieate spinules, back otherwise quite smooth. Side-plates 1—4 setiferous. Eyes narrowly reniform, black. Antenna 1 only '/, as long as body, rather shorter than antenna 2, 15 joint broad, flat, 2% and 34 thin, flagellum with 10 joints, 1° rather long, and as long as 1-jointed accessory flagellum. Antenna 2, flagellum 4- or 5-jointed. »Gnathopods 1 and 2 equal, 5®% joint piriform. Peraeopod 3, 24 joint broader below than above, hind margin with upper and lower corners rounded. Peraeopod 4, 24 joint wider above than below. Peraeopod 5, 24 joint wider below, hind margin evenly rounded, and as in peraeopods 3 and 4 setose. Uropod 3 /,, as long as body, but reaching beyond uropods 1 ‚and 2, outer ramus 1-jointed, 4 or 5 times as long as inner, with 5 spines and 3 setae on the apex, a spine and ä.seta on outer margin, inner ramus 26* 404 Mieruropus, Neoniphargus with only 1 very long apical seta. Telson divided. Colour greyish white. L. about 10 mm. Lake Baikal. Close to the shore. 12. M. pachytus (Dyb.) 1874 Gammarus p. + @.p. var. dilatatus, B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl, p.182; p. 183 |; 1898 Atylus? p., A. Della Valle in: F. Fl. Neapel, 0.20 p.929 | 1899 Micruropus p., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 424. Segments smooth, except that the hind margin is thickened and overlaps front margin of following segment. In var. dilatatus the surface of the body covered with short hairs, and the setae of side-plates 1—4 long, stout, almost spine-like. Eyes small, rounded reniform, black. Antenna 1 !, as long as body, subequal to antenna 2, 1° joint broad, flagellum 11-jointed, with oblique attachment, so that it is always direeted outwards, accessory flagellum 1-jointed. Antenna 2, flagellum 8- or 9-jointed. Gnatho- pods 1 and 2 almost equally long, 6!" joint narrowly piriform im gnatho- pod 1, obliquely oblong in gnathopod 2, in the var, gnathopod 1 is said to be the larger. Peraeopods 3—5, 24 joint very setose on hind margin. Peraeo- pods 3 and 4, 24 joint broader below than above (in var. considerably broader above than below). Peraeopod 5, 24 joint broad, strongly and evenly curved behind, broadest in the upper half (in var. trapezoidal, broader below than above). Uropod 1 reaching at least as far back as uropod 3. Uropod 3 very short, scarcely '/,, as long as body, (in var. rudimentary, '/,, as long as body), outer ramus 2-jointed, less than twice as long as inner, with 3 spines on apex, 2 or 3 on outer margin (in var. with 4 on apex, 1 on outer margin); inner ramus with 1 apical spine. Telson divided (in var. short, divided almost to the middle). Colour greyish white (in var. greenish white). L. 15 mm. Lake Baikal. Depth 2—-10 m. 20. Gen. Neoniphargus Stebb. 1899 Neoniphargus (Sp. typ.: N. thomsoni), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 424. Side-plates 1—4 much deeper than those which follow. Eyes well developed. Antenna 1 the longer, accessory flagellum very small, 2-jointed. Mouth-parts nearly as in Niphargus (p. 405), but maxilla 1 said to have 6 spines on outer plate. Gnathopods 1 and 2 similar, subchelate, Stk joint distally wide, 6" quadrate. Peraeopod 5 shorter than peraeopod 4. Uropod 3 not elongate, outer ramus 1-jointed, inner minute. Telson partly cleft. 1 accepted and 1 doubtful speeies. 1. N. thomsoni Stebb. 1893 Niphargus montanus (non Gammarus m. A. Costa 1851!), @. M. Thomson in: P. R. Soc. Tasmania, 1892 p. 70 t.6 f. 1—13 | 1899 Neoni- phargus thomsoni, T. Stebbing. in: Tr. Linn. Soe. London, ser.2 0.7 p.425. Head, lateral corners very little prominent. Side-plate 1 rounded below, 4th broad, emarginate. Pleon segments 1—3, postero-lateral corners rounded. Eyes relatively large, subreniform, close to lateral margin of head. Antenna 1 short, 24 joint rather shorter than 1st, and 39 than 24, flagellum rather longer than peduncle, with about 14 joints, accessory flagellum rather longer than 18° joint of primary. Antenna 2 said to be about half as long as antenna 1, flagellum shorter than peduncle, 8-jointed. Gnathopods 1 and 2, 5!" joint triangular, = Br Er Br = ü jr “ Neoniphargus, Niphargus 405 cup-shaped, distally very wide, 6f nearly square, hind margin rugose, palm transverse, minutely denticulate. Uropods 1 and 2 reach nearly as far back as uropod 3. Uropod 3, outer ramus rather longer than peduncle. Telson as broad as long, cleft "to eentr e, apices broad, each carrying 4 spinules. Colour whitish yellowish to brown. L. 6 mm. Tasmania (swampy ground near top of Mount Wellington about 1200 m). N. moniezi (Wrzesn.) 1889 Gammarus puteanus (err., non ©. L. Koch 18351), Moniez in: Rev. biol. Nord France, v.1 p.245 | 1890 Niphargus moniezi, Wrzesniowski in: Z. wiss. Zool., v.50 p.672, 675, 676 | 1899 N. m., Neoniphargus (part.)?, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 425. Eyes wanting. @Gmnathopods, 1 aud 2, 6th joint oval. Uropod 3 short, inner ramus represented by a scale, oval. broad, „replice“, without apical spines or setae, outer ramus l-jointed. Telson double. L. 6—7 mm. North of France, Subterranean waters. 21. Gen. Niphargus Schiödte 1849 Niphargus (Sp. un.: N. stygius), Schiödte in: Danske Selsk. Skr., ser.5 v.2 p-26 | 1890 N., Wrzesniowski in: Z. wiss. Zool., v.50 p.620 | 1893 N., A. Della Valle in: F. Fl. Neapel, v.20 p.704 | 1894 N., Chilton in: Tr. Linn. Soc. London, ser.2 v.6 p. 165. Body compressed, not carinate. Side-plates 1—4 not large. - Eyes rudimentary or wanting. Antenna 1 the longer, accessory flagellum not more than 2-jointed. Upper lip rounded. Lower lip, inner lobes well developed. - Mandible normal, 34 joint of palp longer than 24, Maxilla 1, inner plate with few (2 or 3) setae, outer with 7 spines, palp of right and left maxilla alike in form. Maxilla 2, inner plate not or very slightly fringed along inner margin. Maxillipeds, outer plates not very broad, fringed with spine- teeth on inner margin, palp elongate. Gnathopods 1 and 2 similar, subchelate, 5th joint less wide than 6", 6th joint dilated, finger with nail. Uropod 3, _ outer ramus long, 2-jointed, inner very small. Telson more or less deeply eleft. 10 species accepted, 10 doubtful. Synopsis of accepted species: 1 Accessory flagellum of antenna 1 with 2 joints — 2. ’ Accessory flagellum of antenna 1 with only 1 joint — 8, Antenna 1 longer than the body; telson differing in a ee Fer 1. N. eroatieus . p. 406 Antenna 1 not longer than the body; telson not differing ing andQ — 8. 2 ‚Pleon segment 2, postero-lateral corners rounded, in | N ee re EEE UT Br 2. N. forelii . . p.406 3 Pleon segments 2 and 3, postero-lateral corners more or less rounded — 4. | Pleon segments 2 and 3, postero-lateral eorners acute or quadrate >— 5. Side-plates 1—4 not deeper than side-plate 5 .. . 3. N. aquilex. . p.406 Side-plates 1—4 deeper than side-plate 5 . . . . - 4. N. stygius.. . p. 407 Gnathopods 1 and 2, 6th joint broader than long — 6. Gnathopods 1 and 2, 6th joint longer than broad — 7. en NR ORTE RE ER 5. N. puteanus . p. 407 Without BER ITR ETTT 6. N.virdöi . . . p. 408 4 5 6 Er ee El ag EEE a ee N EHE, e) TERN TEN 406 Niphargus f Gnathopods 1 and 2, 6th joint narrowing distally. . 7. N. fontanus . p.408 \ Gnathopods 1 and 2, 6th joint widening distally .. 8. N. kochianus p.408 . f Antenna 1, accessory flagellum tubereuliform . . . 9. N. oreinus. . p.408 \ Antenna 1, accessory flagellum spine-like .... . 10. N. godeti . . p.409 1. N. croaticus (Jurinac) 1887 Eriopis croatica, Jurinae in: Rad Jugoslav. Ak., 0.83 p.96 t. f.1—12a | 1888 Niphargus eroaticus, Jurinac, Fauna Kroat. Karst., p- 11—16 f£. | 1890 N. c., Wrzesniowski in: Z. wiss. Zool., v.50 p. 610, 670, 676, 716 1889 Gammarus c., Moniez in: Rev. biol. Nord France, v.1 p. 252. Pleon segments 1—6, hind margin armed with a close-set row of backward pointing spinules. Side-plates successively deeper from 1°: to 34, 4th less deep than 34. Pleon segments 1—3, postero-lateral corners sub- acute. Eyes wanting. Antenna 1 in J rather longer than the body, flagellum more than 4 times as long as peduncle, 73-jointed, accessory flagellum 2-jointed. Antenna 2 less than '/, as long as antenna 1, ultimate joint of pedunele longer than penultimate, more than twice as long as the 8-jointed flagellum. Gnathopod 1, 6 joint trapezoidal, a little tending to oval, being . outdrawn towards the hinge of the finger, palm slightly convex, well defined. In the 9 gnathopod 1 appears to have the 6!" joint almost rectangular. Gnathopod 2, 6! joint reetangular, palm slightly convex. Peraeopod 3 con- siderably longer than peraeopods 1 and 2, but shorter than the long equal peraeopods 4 and 5. Peraeopods 3—5, 24 joint comparatively narrow, coarsely serrate. Uropod 1, rami equal to peduncle. Uropod 2 shorter, rami longer than peduncle Uropod 3 reaching much beyond the others, 1° joint of outer ramus 15 times as long as 24, carrying 8 plumose setae and many spinules, inner ramus very short, with apical spine and seta. Telson in C with a wide arched emargination rather more than '/, of its length, and 2 or 3 spines on the blunt apices, in O -cleft more than ”/, of length, the ineision not rounded but acute, 5—8 spines on the apices. Colour quite white. L. Q 18:5, 0 20 mm. Croatia (cavern near Zagorije). 2. N. forelii Humb. 1877 N. puteanus var. f. + N.p. var. onesiensis, A. Humbert n: Bull. Soc. Vaudoise, v.14 p.278 t.6,7|1888 N. p. var. f., T. Stebbing in: Rep, Voy. Challenger, v.29 p.456 | 1890 N. f., Wrzesniowski in: Z. wiss. Zool., v.50 p. 621, 631, 668, 674 | 1889 Gammarus puteanus var. f., Moniez in: Rev. biol. Nord France, v.1 p. 247 | 1882 Niphargus p. var. forellii, G. Joseph in: Berlin. ent. Z., ©.26 p.7. Side-plates 1—4 deeper than the following. Pleon segment 2, postero- lateral corners rotundo-quadrate, segment 3, postero-lateral corners acute, Eyes wanting. Antenna 1 rather less than half as long as body, 1° joint of pedunecle nearly as long as 29 and 34 combined, flagellum 16-jointed. Antenna 2, ultimate joint of pedunele rather shorter than penultimate, flagellum 7—-9-jointed. Inner lobes of lower lip not mentioned. Gnatho- pods 1 and 2 similar, 6% joint moderately broad at base, widening towards the straight palm at right angles with the convex hind margin; palm rather longer in gnathopod 2 than in gnathopod 1. Peraeopods 1—3 subequal, shorter than peraeopods 4 and 5. Peraeopods 3—5, 24 joint rather broad, according to figure. Uropod 3, outer ramus with 24 joint well developed. Telson eleft about ®/, of length. L. 9 mm. Switzerland (Lake of Geneva, well at Onex). 3. N. aquilex Schiödte 1841 Gammarus puteanus (part.: forma II), C. L. Koch, C.M. A., 0.36 or. 22 | 1889 @.p. (part.: forma II), Moniez in: Rev. biol. Nord France, v.1 p.245 | 1853 Niphargus stygius (err., non Gammarus s., Schiödte 1847!), Westwood Niphargus ö 407 in: Ann. nat. Hist., ser.2 v.12 p.44 | 1855 N. aqwilex, Schiödte in: Ov. Danske Selsk., p- 350 f. | 1888 N. a. (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.158, 287, 304, 316, 448, 456 | 1890 N. puteanus var. vejdovskyi, Wrzesniowski in: Z. wiss. Zool., 0.50 p- 655 t.27 £.6,9—11, 15; t.28f.1—3; t.30 f.3 | 1893 N. subterraneus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.704 t. 38 f. 31—34. Body long and narrow. Side-plates I—4 not deeper than 5tt. Pleon segments 1—3, postero-lateral corners rounded. _Eyes wanting. Antenna 1, 18 joint nearly as long as 22 and 39 combined, 34 abouthhalf aslong as 24 ‚flagellum with about 20 joints, accessory flagellum very small, 2-jointed. Antenna 2 much shorter but with longer pedunele, ultimate joint of peduncle a little shorter than penultimate, flagellum 7- or 8-jointed. Gnathopods 1 and 2, ‚5b joint much narrower than 6, 6th rounded triangular, widening to the palm, which is long, straight, defined by a spine at the obtuse angle. Peraeo- pods 1—3 subequal, peraeopods 4 and 5 rather longer. Peraeopods 3—5, 24 joint oblong oval. Uropods 1 and 2 very short, uropod 3 very long, especially in 9, peduncle short, outer ramus very long, 24 joint in J nearly as long as 1°, in © much shorter, inner ramus short, rudimentary. Telson short, deeply cleft, apices obtuse. Colour whitish, pellueid. L. S reaching 20, oQ 12:5 mm. Hurope (south of England, St. Briac, Leyden, Cologne, wells in Bohenia (var. vejdovskyi), and other places). 4. N. stygius (Schiödte) 1847 Gammarus s., Schiödte in: Ov. Danske Selsk., p-81 | 1849 Niphargus s., Schiödte in: Danske Selsk. Skr., ser.5 v.2 p.26 t.3 | 1890 N. s., Wrzesniowski in: Z. wiss. Zool., v.50 p. 603, 620, 665. Body long and narrow. Side-plate 3 slightly deeper than 4%, 4% than Stk, Pleon segments 1—3, postero-lateral corners in figure slightly rounded. Eyes wanting. Antenna 1, 1° joint rather longer than 24, 34 half as long as 24, flagellum 16—25-jointed, accessory flagellum very small, 2-jointed. Antenna 2 ?/, as long as antenna 1, ultimate and penultimate joints of pedunele subequal, flagellum 7—9-jointed. Maxilla 1 with 7 spines on the outer . plate, but figured with several setae on the inner plate and a great number on the outer margin of the palp’s 24 joint, peculiarities not to be acceptsd without corroboration. Gnathopods 1 and 2 very setose according to figure, 5th joint triangular, much shorter. than 6, 6 Jonger than broad, widest at the somewhat oblique palm, which is well defined by a strong spine at the angle.e Gmnathopod 2 rather larger than gnathopod 1. Peraeopods 1 and 2 slender, equal, shorter than the 3 following, which successively encrease - in length, with oval 24 joint. Uropods 1 and 2 short, each with equal rami. Uropod 3, inner ramus ind '/,,„, inQ !/, as long as outer, tipped with 2 spinules and a seta, outer ramus with 1°!joint in C thrice as long as pedunele and subequal to 24 joint, in Q twice as long as peduncle and twice as long as 24 joint. Telson eleft beyond the middle, apices- subacute. Colour snow-white. L. 10—14 mm. Caves of Adelsberg and Lueg in Krain. F 5. N. puteanus (C. L. Koch) 1835 Gammarus p. (part.: forma I), ©. L. Koch, 6. M. A., 0.5 nr.2|1862 Niphargus p., Bate, Cat. Amphip. Brit. Mus., p. 177 t.32 f.4 | 1890 N. ratisbonensis, Wrzesniowski in: Z. wiss. Zool., v.50 p. 662, 673, 696. Scarcely distinguishable from N. stygius, except in having yellow eyes, gnathopods 1 and 2, 6% joint very large, almost rectangular, broader than long, and the otherwise pellueid body streaked along the edges of the peraeon segments and to the and of pleon with a yellow ochre stripe. L. 12°5 mm. Regensburg, in wells; also at Poitiers. 408 Niphargus 6. N. virei Chevreux 1896 N. »., Chevreux in: Bull. Mus. Paris, v.2 p. 136. O..»Body less slender than usual in Niphargus. Pleon segment 5 with 6 very minute dorsal spines, segment 6 with 8. Head, lateral corners very prominent, rounded. Anterior side-plates much deeper than their segments, 4!" much deeper than 5", Pleon segments 1—3, postero-lateral corners quadrate with slightly acute point. Eyes wanting or rudimentary, perhaps represented by irregular blotches of yellowish pigment, which disappear in spirit. Antenna 1 °/, as long as body, flagellum 44—-56-jointed, accessory flagellum 2-jointed. Antenna 2 very short, flagellum a little longer than ultimate joint of peduncle, 15-jointed. Gnathopod 1, 6* joint almost quadrangular, a little broader than long, finger matching palm. Gmnathopod 2, 6th joint considerably larger than in gnathopod 1, subtriangular, tending to quadrate, much broader than long, twice as broad as the 5!" joint, finger strongly curved, slightly shorter than palm. Peraeopods 1-—5 slender and very elongate. Uropod 3, inner ramus rudimentary, outer very long, 24 joint less than half as long as 1°. Telson as broad as long, squarely truncate, . with a wide emargination oceupying ”/, of the length, each lobe ending in 6 strong spines and carrying a group of 3 spines and a setule towards the middle of the outer margin. L. 25—31 mm. Jura. ÜCaves. 7. N. fontanus Bate 1859 N.f.. Bate in: P. Dublin Univ. zool. bot. Ass., o.1 p-237 £. | 1862 N. f., Bate, Cat. Amphip. Brit. Mus., p.175t.32f.2 1890 N. f., Wrzesniowski in: Z. wiss. Zool., 0.50 p.665 | 1893 N. subterraneus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 704. Comparatively robust. Side-plate 4 the deepest. Pleon segments 1—3, postero-lateral corners acute. Eyes very small, of irregular shape, bright lemon. Antennae 1 and 2 as in N. aquilex (p. 406). Gmathopods 1 and 2 alike, 5th joint narrow, 6' large, the base much wider than the 5%, pear- shaped, narrowing from the palm to the hinge of finger, palm very oblique, much longer than hind margin, defined by a strong palmar spine, finger long, much eurved. Peraeopods 1 N. stygius (p. 407). Uropod 3, 24 joint of outer ramus shorter than 1%. In the © gnathopods 1 and 2 have the 6tk joint shorter and less distinetly pear-shaped, and uropod 3 has the 2° joint of outer ramus much shorter than 1°. Telson apparently as in N. aquilex. L. 12:5 mm. South of England. Wells. 8. N. kochianus Bate 1859 N. k., Bate in: P. Dublin Univ. zool. bot. Ass., vo. 1 p.237 £. | 1862 N. k., Bate, Cat. Amphip. Brit. Mus., p.176 t.32 f.3 | 1890 N. k., Wrzesniowski in: Z. wiss. Zool., v.50 p.665 | 1898 N. subterraneus (part.), A. Della Valle in:. F. Fl. Neapel, ©. 20 p. 704. In elose agreement with N. fontanus except in regard to gnathopods 1 and 2, 6tk joint, which approaches in form an imperfect oblong square, abruptly wider than the 5t% joint, and widening slightly to the sinuous palm, this being nearly at right angles with the serrate hind margin. Nothing is said about eyes. Uropod 3 figured with a very short 24 Era to outer ramus. L. about 8 mm. England (Hampshire and Wiltshire), Ireland (Dublin). Wells. 9. N. oreinus Joseph 1869 N. o., G. Joseph in: Jahresber. Schles. Ges., v.46 p.52 | 1890 N. o., Wrzegniowski in: Z. wiss. Zool., e.50 1.669. 676 | 1889 Gammarus o., Moniez in: Rev. biol. Nord France, v.1 p.252 | 1893 Niphargus subterraneus (part.)?, A. Della Valle in: F. Fl. Neapel, 0.20 p. 705, ba WE a BE AT DE Fr u f Mr Ra: rn L { J . Niphargns 409 Somewhat robust. Head somewhat acutely rostrate. Eyes wanting. Antenna 1 short, in the G "/,, in the © "/, of length of body, 24 joint longer than 1%, 34 ?/, as long as 24, flagellum twice as long as peduncle, 34-jointed, accessory flagellum represented by a small-tubercle carrying 1 seta. Antenna 2 half as long as antenna 1, ultimate joint of peduncle rather longer than penultimate, flagellum 13-jointed. Mouth-parts said to differ from those of other species. Gmathopods 1 and 2, 5th joint short, triangular, 6!" large, rotundo-quadrate, palm defined by a elaw-like inward-direeted strong tooth (palmar spine?), finger large, curved. Peraeopods 1 and 2 strong, slender. Peraeopod 5 the longest. Uropods 1 and 2 short. Uropod 3, outer ramus in S 6 times as long as pedunele, its 29 joint half as long as 1°, inner ramus short, laminar, almost as long as pedunele, more setose in © than in Q. ‚Telson deeply eleft, the conical halves as long as peduncle of uropod 3, armed with spines. Colour clear yellowish grey, tip of finger and tooth of palm in gnathopods 1 and 2 flesh-coloured. L.C 51, oO 475 mm. Krain. Stalactite-caves. 10. N. godeti Wrzesn. 1867 Gammarus puteanus (err.. non C. L. Koch 1835!), " Godet in: Bull. Soe. Neuchatel, v.7 p.424 | 1889 G.p., Moniez in: Rev. biol. Nord France, v.1 p.252 | 1890 Niphargus godeti, Wrzesniowski in: Z. wiss. Zool., v.50 p.668, 674. Side-plate 4 much the largest. Pleon segments 1—3, postero-lateral corners rounded. Eyes wanting. Antenna 1 almost as long as body, flagellum 6 times as long as peduncle, 51-jointed, accessory flagellum spine-like. Antenna2 very short, little more than '/, as long as antenna 1. Gnathopods 1 and 2, 6'h joint spoken of as triangular, but in fact figured as rather broad at base though widening to the slightly convex, not oblique palm. Peraeopods 3—-5 seemingly subequal in length, 2“ joint rather broad, hind margin coarsely serrate. Uropod 3 more than half as long as body, outer ramus with very long 24 joint. L. 33 mm. Neuchätel. Well. N N. casparianus Wrzesn. 1849 Gammarus puteanus (err., non ©. L. Koch 1835)), Caspary in: Verh. Ver. Rheinlande, 0.6 p.39 t.2 | 1850 @. p., Hosius in: Arch. Naturg., v.161 p.233 | 1890 Niphargus casparianus, Wrzesniowski in: Z. wiss. Zool., v.50 p.664, 673. Scarcely distinguishable from N. kochianus. Germany (Elberfeld, Bonn). N. caspary (Pratz) 1866 Gammarus e., Pratz, Grundw. 'Thiere | 1889 @. e., Moniez in: Rev. biol. Nord France, v.1 p.230 | 1890 Niphargus e., Wrzesniowski in: Z. wiss. Zool., v.50 p. 666. Gmathopods 1 and 2 with 6th joint triangular (probably widening from the base). Uropod 3 in S, 1st joint of outer ramus 4—5 times as long as peduncle, 24 joint short; in Q outer (Moniez: „interne“) ramus 1-jointed, the joint searcely longer than peduncele. Munich. Well. N. elegans Garbini 1894 N. e.+N. e. var. imperfectus + Gammarus flwviatilis var. .manophtalmus, Garbini in: Mem. Acc. Verona, ser. 350.70 p. 108,109 | 1895 N. e. + N. e. var. i. + @. f. var. m., Garbini in: Mem. Ace. Verona, ser.3 v.71ı p. 33, 38, 31. Near to N. tatrensis (p. 410), differing by want of spine-rows on pleon segments 1—3, by greater number of joints in antennae 1 and 2, by relative length of joints und. armature of uropod 3 ete. Eyes developed to wanting. Verona. 410 Niphargus N. longieaudatus (A. Costa) 1851 Gammarus longicaudatus, @. longicauda (non F. Brandt 1851!), (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p.45, 23 | 1857 @. longicaudatus, A. Costa in: Memı. Ace. Napoli, v.1 p.217 t.4 £.6 | 1890 Niphargusl. (part.), Wrzesniowski in: Z. wiss. Zool., e.50 p. 603, 625, 674 | 1893 N. subterraneus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 704. Probably the same as N. aquilex (p. 406). L. 12:5 mm. Naples. In the drinking water. N. minutus (Gerv.) 1835 Gammarus pulex m., P. Gervais in: Ann. Sci. nat., ser.2 v.4 p.128 | 1859 @. lacteus, P. Gervais & P. .J. Beneden, Zool. med., v.1 p.488 | 1890 @.1., Wrzesniowski in: Z. wiss, Zool., e.50 p.602 | 1893 @. fluviatilis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 763. L. minute. Neighbourhocd of Paris. Only in wells. N. montanus (A. Costa) 1851 Gammarus m., (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p.44 | 1857 @. m., A. Costa in: Mem. Acc. Napoli, v.1 p.218 t.4 f.7,8| 1867 @. longicaudatus var., A. Costa in: Annuario Mus. Napoli, v.4 p.38 | 1890 Niphargus longicaudatus (part.), Wrzesniowski in: Z. wiss. Zool., v.50 p. 674. Agreeing nearly with N. longieaudatus but differing in uropods and telson. L. 12:5 mm. Italy (Lake Matese). N. ponticus Üzern. 1868 N.p., Üzerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.108 t.8 f.12—14 | 1888 N. p., T. Stebbing in: Rep. Voy. Challenger, v.29 p-378 | 1890 N.? p., Wrzesniowski in: Z. wiss. Zool., v.50 p.673 | 1893 N. subterraneus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 705. L. about 2 mm. Black Sea. N. rhipidiophorus (Catta) 1878 Gammarus r., Catta in: Act. Soc. Helvet., Sess. 60 p. 257 | 1889 @. r., Moniez ih: Rev. biol. Nord France, v.1 p.252 | 1892 @. r., Chevreux and Guerne in: Bull. Soc. zool. France, v.17 p.140 | 1888 Niphargus r., T. Stebbing in: Rep. Voy. Challenger, v.29 p.475 | 1890 N.? r., Wrzesniowski in: Z. wiss. Zool., v.50 p. 607, 673 | 1898 Gammarus pungens (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 764. ’ Eyes small. Peraeopod I with brush of long setae on 5th and 6th joints. Uropod 3 enormous. France (a well, brackish in summer, at La Ciotat, near the Mediterranean). N. subterraneus (Leach) 1813/14 Gammarus s., Leach in: Edinb. Ene., ©.7 p. 402 | 1893 Niphargus s. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 704 | 1888 N. aquilex (part.), T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 84. London. Well. N. tatrensis Wrzesn. 1888 N. t., Wrzesniowski in: Pam. Fizyjogr., v.8 p.47 t.6—16 | 1890 N. t., Wrzesniowski in: Z. wiss. Zool., v.50 p.643 t.27 £.1—5,7, 8, 12—14; t.28 £.4, 5,8; t.29 £.1—8, 12; t.30 £. 11-13; t.31 £.5, 14, 14a, 18—21; t. 32 {.1, 8, 8a. Perhaps identical with N. stygius (p. 407); but said to be distinguished by the postero-lateral corners of the pleon segments I—3, the 6th joint.of the gnathopods l and 2, the relative length of peraeopods 3 —5, the relative length of the apical joint in uropod 3, and the setose armature of the mouth-parts. Tatra Mountain. ie an a a HE DS EEE Ep EL rn 222 Deu Te a ha nl ua my Dunn da nn Dan ar le ia tn u BERN ERBETEN zu Eriopisa 4ll 22. Gen. Eriopisa Stebb. “ 1859 Eriopis (non E. Mulsant 1851, Coleoptera!), R. M. Bruzelius in: Svenska Ak. Handl., n.ser. ©.3 nr.1 p.64 | 1890 Eriopisa, T. Stebbing in: Ann. nat. Hist., ser. 6 0.5 p.193|1893 E., A. Della Valle in: F. Fl. Neapel, v.20 p.705 | 1894 E., G. O. Sars, Crust. Norway, v.1 p.514 | 1890 Eriopsis, Wrzesniowski in: Z. wiss. Zool., v.50 p. 632. Body slender and smooth. Head not rostrate. Side-plates all shallow. ‚Eyes wanting. Antenna 1 much the longer, accessory flagellum small, 2-jointed. Upper lip rounded. Lower lip with inner lobes. Mandible normal, spine-row with many spines, palp slender, 39 joint longer than 24. Maxilla 1, inner plate with numerous setae, outer with 7 spines, 24 joint of palp with 3 or 4 spine-teeth. Maxilla 2, inner plate fringed on ?/, of inner margin. Maxillipeds, inner plates squarely truncate, outer fully reaching middle of palp’s 24 joint, with setiform spines on apical margin, spinules of inner margin not close to the edge, 39 joint of palp wide, finger slender, tipped with a spine. Gmathopods 1 and 2 subchelate, unlike and unequal, finger without nail or dentiele, gnathopod 2 the larger. Peraeopod 5 the longest, with 24 joint larger than in the other peraeopods. Uropod 3, inner ramus very small, outer very long, 2-jointed, the joints laminar. Telson deeply_cleft. 1 species. 1. E. elongata (Bruz.) 1859 Eriopis e.. R.M. Bruzelius in: Svenska Ak. Handl., n. ser. ©.3 nr.1 p.65 t.3 f.12 | 1871 Niphargus elongatus, A. Boeck in: Forh. Selsk. Christian., 1870 p.136 | 1876 N.e., A. Boeck, Skand. Arkt. Amphip., v.2 p.403 t. 22 f.5 1890 Eriopsis elongata, Wrzesniowski in: Z. wiss. Zool., v.50 p.632 | 1893 Eriopisa e., A. Della Valle in: F. Fl. Neapel, v.20 p.706 t.38 f.17---30; t.60 f.5 | 1894 E. e., G. O. Sars, Crust. Norway, v.1 p.515 t.181 f.2 ! 1895 E.e., A. M. Norman in: Ann. nat. Hist., ser.6 v.15 p. 490. Body elongate. Head, lateral corners slightly projeeting, rounded, post- antennal corners dentiform. Side-plates scarcely eontiguous, 1° angularly produced forward, 4" Jittle larger than 5t" and like it in shape. Pleon segment 3, postero-lateral corners produced into a small tooth. Antenna 1 as long as body, 1°t joint not longer than 24, with slender spine at apex, 34 little over !/, as long as 24, flagellum nearly thriee as long as pedunele, 32-jointed, - aceessory flagellum shorter than 1st joint of primary. Antenna 2 little longer than pedunele of antenna 1, ultimate joint of pedunele shorter than penultimate and subequal to the 6-jointed flagellum. Gmnathopod 1, 24 joint as in 3 following limbs very narrow at base, 5th joint as long as 6" but narrower, 6" triangular, palm and hind margin almost at right angles one to other. Gnathopod 2 much larger, 5® joint triangular, cup-shaped, much shorter than 6, 6th oblong oval, narrowing distally, palm very oblique, ill-defined, long, a little notched, armed with some strong spines, finger eiliated on inner margin. Peraeopods 1 and 2, 5th joint rather expanded. Peraeopod 3, 24 joint narrowly oval. Peraeopod 4 longer, 24 joint considerably wider. Peraeopod 5 with 24 joint oval, much larger than in peraeopod 4, hind margin strongly serrate as also in peraeopods 3 and 4. Uropods 1 and 2 of very moderate size. Uropod 3, pedunele short, inner ramus not quite equal to it, outer ramus as long as pleon. segments 1—5 combined, both joints laminar, fringed witl spinules, 24 rather the shorter, its truncate apex armed with dense brush of setae. Telson scarcely as long as pedunele of uropod 1, subtriangular, cleft close to base, apices acute, with spine and setule in notch formed by external tooth a little way up lateral margin. Colour yellowish. L. 11 mm: Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (South- and West-Norway to Lofoten Isles, depth 94—752 m; Bohuslän; Great Britain); Kattegat; Mediterranean. 412 Gmelina 23. Gen. Gmelina 0. Sars 1894 Gmelina, (0. Grimm in MS.) G.O.Sars in: Bull. Ae. St.-Petersb., ser. 5 v.1 p.191. Head with small rostrum, lateral lobes rather small. Side-plates 1—4 larger in © than in CO, 4 not very wide, nor strongly emarginate. Antennae 1 and 2 subequal, not elongate, slender, accessory flagellum 1-jointed. Mouth- parts nearly as in Gammarus (p. 460), but upper lip with no emargination at apex and with an obtuse prominence in front. Maxilla 2 with outer plate considerably broader than inner, palp of maxillipeds rather short, with 34 joint distally expanded. Gmathopods 1 and 2 alike, subchelate, feeble in Q, stronger in GC. Peraeopods 1-—5 not elongate, successively shorter to peraeopod 3 and thence successively longer, 24 joint rather larger and more laminar in peraeopod 5 than in 3 or 4. Uropod 3 more or less projeeting, outer ramus well developed, with very small 24 joint, inner ramus small, scale-like. Telson deeply_cleft. , . 4 species. Synopsis of species: | Many segments with conspieuous projeetions. — 2. 1 N i £ SR o segments with conspieuous projeetions — 8. 9 [ With median dorsal carina . . . -. u... 1. @. costata . . . p.412 Without median dorsal earina . ......2.u 2. G. kusnezowi . p.413 „ 5 Uropod 3, inner ramus longer than peduncle. . . 3. G. laeviuscula . p.413 \ Uropod 3, inner ramus not longer than pedunele . 4. G. pusilla . . - p.41l4 1. G. costata O. Sars 1894 @. e. (O. Grimm in MS.), (Palasiella macera in MS.) G. ©. Sars in: Bull. Ace. St.-Petersb., ser.5 «.1 p.192 t.3. Very slender and compressed, especially in C, integument erustaceous, median dorsal earina beginning faintly on peraeon segment 1, reaching highest elevation on pleon segment 3, the obtusely triangular laminar process on this and on the next preceding and 2 following segments being very con- spicuous, pleon segments 4 and 5 ending in upturned points, segment 6 smooth. On peraeon segments 1—-7 prominences near the side-plates form a low obtuse lateral keel. Head, rostrum triangular, not elongate, lateral lobes broadly truncate, post-antennal corners acute. Pleon segment 2, postero-lateral corners acutely produced, in segment 3 acute, subquadrate. Eyes oval reniform, not large, dark. Antenna 1, 1° joint nearly as long as 24 and 34 combined, 24 not twice as long as 34, flagellum little longer than pedunecle, with about 16 short joints, aecessory flagellum with 3 setules at tip. Antenna 2 in JS. equal to antenna 1, ultimate joint of pedunele as long as penultimate, flagellum 8-jointed, in O rather shorter than antenna 1, ultimate joint of pedunele shorter than penultimate, flagellum 6-jointed. Gmathopods 1 and 2 in CS, 6% joint much longer than 5%, large, oblong oval, widening a little to the concave palm, which is defined by a nearly rectangular lobe, armed with 2 strong spines, between which the strongly eurved finger impinges. Gnathopod 1 in O feeble, 6 joint longer than 5%, oblong quadrangular, palm rather oblique; gnathopod 2 rather more slender, 6% joint as long as 5t"%, palm nearly transverse. Peraeopods 3 and 4, 24 joint little expanded, narrowing distally. Peraeopod 5, 24 joint oblong quadrangular. Uropod 2 the smallest, the rami linear, with spines only at the apex. Uropod 3 large, projecting far beyond the others, peduncle short and thick, outer ramus large, foliaceous, margins setose and spinulose, apex broad, with a Gmelina 413 diminutive 24 joint, inner ramus rather longer than broad. Telson longer than broad, projeeting beyond peduncle of uropod 3, eleft more than °?/, length, outer margin finely eiliated, the lobes narrowing to obtuse divergent apices, each armed with a spinule and setules. 1.09 12, 16 mm. Caspian Sea. Depth 0—38 m. 2. G. kusnezowi (Sowinski) 1894 Gammarus k., Sowinski in: M&m. Soc. Kiew, v.13 p.883 t.8 | 1894 Gmelina k. (Pallasiella mammillifera in MS.), G. O. Sars in: Bull. Ace. St.-Pötersb., ser.5 v.1 p. 197 t.4. Rather slender and compressed, and more so in S than in 9, integument cerustaceous, with no median dorsal carina, but with a pair of subdorsal prominences on each segment from peraeon segment 1 to pleon segment 3, gradually encreasing from low tubereles to conspieuous knobs; peraeon segments I—5 (or 1—6) with conspieuous lateral projeeting tubereuliform prominences; pleon segments 4—6 dorsally smooth, except that on 5 and 6 there are 2 faseieles of spinules. Head tapering, rostrum short and narrow, lateral lobes narrowly rounded, with a boss-like process above the post- antennal corners. Pleon segments 2 and 3, postero-lateral corners acute, subquadrate. Eyes oval reniform, highly protuberant, very dark. Antenna 1 short, 1° joint little longer than 24, 24 twice as long as 34, flagellum shorter than peduncle, with 15 short joints; accessory flagellum with 3 setules. Antenna 2 subequal to antenna 1, ultimate joint of peduncle shorter than pen- ultimate, flagellum 6-jointed. Gnathopods 1 and 2 nearly as in G. costata, but gnathopod 2 in © with palm more oblique. Peraeopods 1—5 and uropods 1 and 2 nearly as in G. costata. Uropod 3 a little projeeting beyond uropod 1. outer ramus tapering to a narrowly truncate apex, the small but distinet 2 joint carrying several setules, inner ramus a little longer than broad, tapering. Telson broader than long, scarcely as long as peduncle of uropod 3, cleft deep, scarcely dehiscent, the lobes obtusely rounded, 2 spinules on outer and 4 on apical margin of each. Colour in dark transverse bands. L. o 14, 0 18 mm. Sea of Azov, Caspian Sea. 3. G. laeviuscula O.Sars 1896 @.Ll., G. O. Sars in: Bull. Aec. St.-Pötersb., ser.5 v.4 p.480 1.2 f.8—12. unknown. — ©. Rather slender, much compressed, without any distinet tubereles or processes, pleon segments 4—6 dorsally tipped with small bristles. Head slightly tapering, rostrum well marked, lateral lobes slightly produced, narrowly rounded. Pleon segment 3, postero-lateral corners slightly produced, 24 segment simply quadrate. Eyes very small, oval, dark. Antenna 1 rather the longer, flagellum shorter than peduncle, 10-jointed. Antenna 2, ultimate joint of peduncle shorter than”penultimate, flagellum about half as long as peduncle. Gnathopods 1 and 2 rather powerful, these and peraeopods 1I—5 seeming to agree with those of the 2 preceding species. Uropod 1 twice as long as uropod 2. Uropod 3 rather robust, projecting somewhat beyond the others, outer ramus very broad, foliaceous, fringed with fascieles of spinules, 24 joint small, inner ramus nearly half length of outer, not very narrow, nearly thrice as long as broad, tipped with spinules. Telson rather large, oval, cleft nearly to the base, lobes scarcely at all dehiscent, each with 4 or 5 spinules on outer margin, and about 7 on broadly truncate apex. L. 7 mm. North Caspian Sea. Ba a a a 414 Gmelina, Gmelinopsis 4. G. pusilla O. Sars 1896 @.p., @.0.Sars in: Bull. Ae. St.-Pötersb., ser. 5 0.4 p.432 t.2 1.1321. ; oO. Rather short and stout, somewhat compressed, smooth. Head slightly tapering, rostrum small, distinet, lateral lobes angularly produced. Side-plate 1 expanded below and produced forward. Pleon segments 2 and 3, postero-lateral corners quadrate. Eyes small, rounded oval, dark. Antenna 1 feeble, 24 joint subequal to 1°, 3° much smaller, flagellum as long as peduncle, 7-jointed. Antenna 2 stouter, scarcely longer, flagellum small, 4-jointed. Gnathopods 1 and 2 feeble, setose, in gnathopod 1 the 6% joint oblong oval, palm rather oblique, in gnathopod 2 more slender, not longer than 5t", oblong quadrate, palm transverse. Peraeopods 1—5 nearly as in G. laeviuscula (p. 413), but peraeopods 3—5 relatively shorter, more setose, and 24 joint of peraeopod 5 broader, irregularly oval. Uropod 1 not twice as long as uropod 2. Uropod 3 much less robust than in G. laeviuscula, outer ramus tapering, with few fascicles of spinules, 29 joint small, distinet, inner ramus narrow, about '/;, as long as outer, with one apical spinule. Telson longer than broad, celeft nearly to base, lobes each with 2 spinules on outer margin and 2 unequal ones on narrow apices. L. 5 mm. — © unknown. North Caspian Sea. 24. Gen. Gmelinopsis 0. Sars 1896 Gmelinopsis, G. O: Sars in: Bull. Ac. St.-Petersb., ser.5 v.4 p. 434. Peraeon segment 7 and pleon segments 1—3 dorsally carinate; marginal tubercular carinae on peraeon segments 1—7. Side-plates 1—4 rather deep. Antennae 1 and 2 short, slender. Antenna 1 the longer, accessory flagellum small, 2-jointed. Mouth-parts nearly as in Gmelina (p. 412). Gnathopod 1 stronger than gnathopod 2. Peraeopod 5, 24 joint strongly expanded. Uropod 3 rather short, outer ramus with small narrow 24 joint, inner ramus small, scale-like. Telson more or less deeply eleft, lobes apically narrow. 2 species. Synopsis of species: Telson cleft nearly to base, lobes widely dehisceent . . . 1. G. tuberculata . p.414 Telson eleft only to middle, lobes scarcely dehisceent . . 2. G.aurita . . . p.415 1. EG. tuberculata O.Sars 1896 @. t., G.O.Sars in: Bull. Ae. St.-Pötersb., ser. 5 v.4 p.485 1.8 f.1-—19. Peraeon segment 7 and pleon segments 1—3 with median dorsal carina formed by low obtusely rounded laminar expansions; peraeon segments 1—7 with distinet lateral tubereles, pleon segments 4—6 smooth. Head with small distinet rostrum, lateral lobes small, angular, below each of them a conspieuous boss-like prominence extends obliquely downward. Side-plates 1—4 deep, not very broad, slightly erenulate distally; side-plate 4 slightly emarginate behind. Pleon segments 1—3, postero-lateral corners rounded off. Eyes rather small, oblong oval, slightly protuberant. Antenna 1, 1° joint as long as 24 and 34 combined, flagellum longer than peduncle, 12-jointed, 24 joint of accessory flagellum minute. Antenna 2 little more than half as long as antenna 1, ultimate joint of pedunele much shorter than penultimate, flagellum scarcely longer than ultimate, 4-jointed. Gnathopod 1, 5 joint short, eup-shaped, 6t large, oblong oval, palm rather oblique, defined by an obtuse corner, carrying a strong spine. Gnathopod 2 much feebler, 6" joint ee ER | un call ira a a na Aida aa De Er Kane Gmelinöpsis, Hakonboeekia 415 shorter and much narrower, oblong quadrangular, palm nearly transverse. Peraeopods 1—5 rather slender and spinulose, 4" longer than 34 or Stk, in 34 and 4b 24 joint oblong oval, rather narrowed distally, larger in peraeopod 4 than in 3. Peraeopod 5, 24 joint greatly expanded, almost heart-shaped, its greatest breadth being below, hind margin minutely erenulate and setuliferous. Uropods 1 and 2 with subequal rami, apically tufted with strong spines. Uropod 3 rather short and thiek, reaching little beyond the others, outer ramus rather thick, slightly curved, apex of 1° joint much broader than the small 2° joint, inner ramus less than twice as long as broad. Telson eleft nearly to base, the lobes tapering, their narrow apices standing wide apart, each armed with a spinule and a hair. L. © 8 mm. Caspian Sea. Deptl 53 m. - 2. G. aurita O.Sars 1896 @.a., @.O.Sars in: Bull. Ae. St.-Pötersb., ser. 5 v.4 p.437 t.3 f. 20—28. O. Peraeon segments 6 and 7 and pleon segments 1—3 with median dorsal carina formed by laminar expansions, rounded on pleon segment 3, triangular on the others. Peraeon segments 1—7 with lateral tubercles less prominent than in G. tubereulata. Pleon segments 4—6 short and stout, with small hairs dorsally, segment 6 with a very minute denticle on each side. Head, lateral lobes small, obtuse-angled, lateral protuberances greatly developed, these spiniform projeetions extending obliquely downward and looking as seen from above like a pair of pointed ears. Side-plates 1-4 rather less deep than in @. tubereulata. Pleon segments 2 and 3, postero- lateral corners subquadrate. Antenna 1, flagellum shorter than peduncle, 10-jointed. Antenna 2 more than half as long as antenna 1. Telson triangular, about as long as broad at base, distally conically tapered, eleft narrow, reaching only to middle, apices acute, each armed with a spinule and 2 hairs. Other parts nearly as in G. tubereulata, but gnathopods 1 and 2 rather less unequal. L. 8 mm. — © unknown. Caspian Sea. Depth 203 m. 25. Gen. Hakonboeckia Stebb. 1899 Hakonboeckia (Sp. un.: H.strauchii), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.425. : Near to Axelboeckia (p. 391) and Gmelinopsis. Peraeon segments with margins acutely produced. Head with rostral and lateral projections. Antenna 1 longer than antenna 2, peduncle of antenna 1 equal to peduncle of antenna 2; accessory flagellum very small. Gmathopod 1, 6!" joint like that of gnatho- pod 2, but longer. Peraeopods 3—5, 24 joint broad, not produced down- ward. Uropod 3, rami subequal, outer (seemingly) 1-jointed. Telson eleft nearly to base. 1 species. 1. H. strauchii (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 112 t.12 f£.7 | 1899 Hakonboeckia s., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.425 | 1893 Gammarus strauchi, @.locusta (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segments 1—7, like serrate edge of a roof broadly expanded in outward and downward direeted pointed angles over the side-plates, most strongly in segments 1—5. Peraeon segments 6 and 7, and pleon segments 1—3 each Te a EEE | Re ur Fr Bo: 5% 3 RN = ae a 416 Hakonboeckia, Baikalogammarus with mid hind margin a little thiekened and raised over following segment. Head, upper profile arched with rostrum projeeting helm-like and deflexed; under part of cheek-lobes strongly projeeting outward and running down into a free acute point. Eyes very prominent, large, oval, dark brown. Antenna 1 little more than '/, as long as body, about twice as long as antenna 2, peduncle stouter than that of antenna 2 but equal in length, flagellum 9- or 10-jointed, accessory flagellum 2-jointed. Gnathopods 1 and 2, 6*k joint oblong, widening a little to the not very oblique palm, larger in gnathopod 1. Peraeopods 3—5, 2X joint broad, heart-shaped, hind margin with 3 or 4 short spine-like setae. Uropod 1 not reaching the end of uropod 3. Uropod 3 '/, as long as body, rami subequal, outer with plumose setae only on inner margin, inner ramus having them on both margins. Colour dark grey or dark green brown, antennae bright, under part of body and peraeopods dark blue or dark violet; a variety brightly coloured, side-plates and under body dark blue. L. 10—11 mm. Lake Baikal. Depth 20—100 m. 26. Gen. Baikalogammarus Stebh. 1899 Baikalogammarus (Sp.typ.: B. pullus), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 425. Near to Gammarus (p. 460). Pleon segments 4—6 with a few dorsal setules or spinules. Antenna 1 the longer, peduncle shorter than peduncle of antenna 2, accessory flagellum very short. Gnathopod 1, 6" joint not smaller than 6t" joint of gnathopod 2. Peraeopods 3—5, 24 joint broad, the wing produced downward in a long rounded lobe. Uropod 3 rather elongate, with peduncle as long as the 2-jointed outer ramus. Telson cleft. 1 species. 1. B. pullus (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.170 t.11 f.4 | 1898 Atylus? p., A. Della Valle in: F. Fl. Neapel, v.20 p-930 | 1899 Baikalogammarus p., T.Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.425. Pleon segments from 24, 34 or 4 to the 6! with 2—4 dorsal setules or very fine spines. Head, rostrum slightly deflexed and forming a helm- like prominence, post-antennal corners (in figure) rounded. Side-plates 1—4 with isolated short setae. Eyes large, widened above, black. Antenna 1 about '/, as long as body, a little longer than antenna 2, 1° joint stout, not as long as 22 and 32 combined, flagellum 15 —18-jointed, accessory flagellum l-jointed. Antenna 2, ultimate joint of peduncle longer than penultimate, curved, flagellum 7—-10-jointed. Gnathopod 1, 6" joint described as piriform, but in figure oblorg oval, widening a little to the oblique palm which is rather shorter than the hind margin. Gnathopod 2, 6" joint oblong, rather smaller than in gnathopod 1. Uropod 1 reaching end of uropod 3. Uropod 2 only reaching end of pedunele of uropod 3. Uropod 3 '/, (less?) of length of body; peduncle as long as outer ramus, which has 24 joint nearly '/, as long as 1%; inner ramus ?/, as long as outer; ‚both with plumose setae on inner margin. Telson in figure very small, much shorter than pedunele of uropod 3. Colour green, spotted with brown. L. 9 6, d 8—9 mm (ineluding uropod 3). Lake Baikal. Depth 3—10 m. TRITT NO Parelasmopus, Cheirocratus 417 27. Gen. Parelasmopus Stebb. 1888 SERIE (Sp. un.: P. suluensis), T. Stebbing in: Rep. Voy. Challenger, 2.29 p. 1029. Head without rostrum. Antenna 1 the longer, accessory flagellum small. Upper lip rounded. Lower lip with inner lobes. Mandible normal except as to palp, which is slender and has the 24 joint smaller than either 1% or 34. Maxilla 1, inner plate with few setae, outer with 7 spines. Maxilla 2, inner plate fringed on distal part of inner margin. Maxillipeds normal, but spine- teeth on apex of inner plate uncertain. Gnathopods 1 and 2 subchelate, 24 with 6'h joint in J very large. Peraeopods 3—5, 24 joint expanded. Uropod 3 not reaching beyond the others (Dana). Telson small, deeply eleft. l species. -1. P.suluensis (Dana) 1852 Gammarus s., J. D. Dana in: P. Amer. Ac., v2 p: 210 | 1853 & 55 @.s., J. D. Dana in: U.S. expl. Exp., v. 1311 p. 947; t.65 f.3 | 1862 Megamoera s., Bate, Cat. Amphip. Brit. Mus., p.230 t.40 f.6 | 1888 Parelasmopus 3., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1029 t. 100. Peraeon segment 7 and pleon segments 1 and 2 each with hind margin dorsally produced into a pair of teeth, segment 3 dorsally emarginate, segment 4 with 2 pairs of upward eurved teeth, segment 6 very short. Head with no rostral point, lateral lobes rounded, post-antennal corners acute. Side-plates 1—4 moderate in depih, 1° a little distally outdrawn. Pleon segments 1—3, postero-lateral corners acute, in segment 3 produced upward, with adjacent lower margin serrate in 4 or 5 teeth. Eyes large, oval, close to lateral lobes of head. Antenna 1 much the longer, 24 joint rather longer than 1°*, 34]less than '/, as long as 24, flagellum with more than 17 joints, accessory flagellum with 2 slender joints. Antenna 2 slender, gland-cone reaching end of . ‚antepenultimate joint, ultimate long, but shorter than penultimate, flagellum 10-jointed. Mandibular palp not so long as thetrunk, 1° and 34 joints equal, each twice or more than twice aslongas 24, 34 slightly tapering. Gnathopod 1, 5% joint nearly as long as 6t, 6th oblong, with oblique row of 20 spines on inner surface, palm slightly oblique, finely dentieulate. Gnathopod 2 in S, 5% joint short, eup-shaped, broader than long, 6% much broader, twice as long as broad, with oblique, irregular palm, having a spinose prominence near hinge of finger, then 4 emarginations and on either side ofthe last ofthem 2 processes of the inner surface adapted to receive the finger-tip. Peraeopods 3 and 4, 24 joint broader above than below, 4tk moderately broad. Peraeopod 5, 24 joint oval. Uropods 1—3 reaching equally far (Dana). Telson scarcely longer than broad, cleft nearly to base, lobes divergent, each with bidentate apex, outer tooth thelonger, 2 unequal spines inserted between the teeth. L. about 8 mm. S00loo Sea (between Cape York and the Arrou Islands). Depth 16 m; among sea-weed floating off the shore. 28. Gen. Cheirocratus Norm. 1862 Liljeborgia (part.), Bate (& Westwood), Brit. sess. Crust., v.1 p. 202 | 1867 Cheiroeratus (Sp. un.: (©. mantis), A. M. Norman in: Nat. Hist. Tr. Northumb., v. 1 p-12 | 1876 C., A. Boeck, Skand. Arkt. Amphip.,' v.2 p.395 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p. 687 | 1894 C©., @. O. Sars, Crust. Norway, v.1 p.528. Pleon segments 4 and 5 dentate, 4" —6tk armed with bristles. Head not rostrate, lateral corners obtusely lobed, post-antennal angles projecting Das Tierreich. 21.Lief.: T.R.R. Stebbing, Amphipoda I. 27 418 Cheirocratus just below them. Side-plate 2 the deepest, 4! scarcely emarginate, little or not at all deeper than 5t". Eyes small, round. Antenna 1 much the shorter, accessory flagellum very small, 2- or 3-jointed. Upper lip rounded. Lower lip, inner lobes moderately distinet. Mandible normal, 1° joint of palp not very short, 39 shorter than 24. Maxilla 1, inner plate with numerous setae. Maxilla 2, inner plate fringed along inner margin. Maxillipeds, palp rather short and slender. Mouth-parts in other respects normal. Gnathopods 1 and 2 inO rather feeble, subequal, 6% joint narrow, without palm. Gnathopod 1 in d asin O, gnathopod 2 in C powerful, strongly subchelate. Peraeopods 1 and 2 slight. Peraeopods 3—5 successively longer, 24 joint narrowly oblong. Uropod 3 long, rami narrowly lanceolate, subequal. Telson deeply celeft, lobes divergent, apically spinose. 4 species. Synopsis of species: Peraeopod 5, 4th-—6th joints narrow — 2. Peraeopod 5, 4th—6th joints broad — 8. Gnathopod 2 ind, palm not marginal, but formed 2 | by teeth on inner surface of 6th joint. ..... 1. ©. sundevallii . . p.418 Gnathopod 2 in d, palm marginal, eoncave. . . 2. C.intermedius . p.419 on inner surface of 6th joint... ..... B) robustus . . . p.419 Gnathopod 2 in d, palm not marginal, but formed 3 | .c. Gnathopod 2 ind, palm marginal, distal, dentate 4. C. assimilis . . . p.419 1. C. sundevallii (H. Rathke) 1843 Gammarus s., H. Rathke in: N. Acta Ace. Leop., v.201 p.65 t.3 f.2 | 1888 Cheirocratus s., T. Stebbing in: Rep. Voy. Challenger, v.29 p.204 | 1893 C.s., A. Della Valle in: F. Fl. Neapel, v.20 p. 690 t.20 £.3, 4, 24, 25, 27,80 | 1876 C. sundevalli, A. Boeck. Skand. Arkt. Amphip., v.2 p.396 t.24 f.2 (but not 2k) | 1889 C.s.,, A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.130 t.11 f£.9, 10; t.12 £.1—3 | 1894 C. sundewalli, G.O.Sars, Orust. Norway, v.1 p.524 t.184; t.185 f.1 | 1862 Liljeborgia shetlandica, Bate & Westwood, Brit. sess. Crust., v.1 p.206 f. | 1862 Protomedeia whitei, Bate, Cat. Amphip. Brit. Mus., p.169 t.31 f.2 | 1874 Lilje- borgia normanni, '. Stebbing in: Ann. nat. Hist., ser.4 v. 14 p. 10 t.1 £.1 | 1879 Cheirocratus brevicornis, Hoek in: Tijdschr. Nederl. dierk. Ver., v.4 p. 142 1.10 £.10—13 | 1884 ©. b., H. Blane in: N. Acta Ace. Leop., 9.47 p.72 t.8 f. 76, 77. Body rather slender and compressed, pleon segment 4 produced dorsally to 3, segment 5 to 4 teeth, with stiff bristles between them, segment 6 with 2 bristles. Head, the lateral lobes separated from the triangular post- antennal corners by a narrow incision. Side-plate 1 somewhat expanded below and angularly produced, 24 deeper in C than in 9, 6!" as deep as 4#, Pleon segment 3, postero-lateral corners acutely produced. Eyes reddish brown. Antenna 1 shorter than pedunele of antenna 2, 1° and 24 joints sub- equal in length, flagellum shorter than peduncle, 12—18-jointed, accessory flagellum with 3 (Boeck) or 2 (Sars) joints. Antenna 2 nearly twice as long as antenna 1, ultimate joint of peduncle longer than penultimate, flagellum shorter than both joints combined, with about 24 joints. Gnathopod 1, 6*% joint rather shorter and much narrower than the elongate 5", both densely setose, finger very small, denticulate. Gmnathopod 2 in © rather more slender, 6 joint about as long as 5tt,. Gmathopod 2 in Cd, 5" joint cup-shaped, much shorter than the large, tumid, ovate 6, which is densely setose about hind margin with long setae and has a sort of sinuous palm on the inner surface armed by 3 or 4 irregularly placed denticles, against which the ceurved finger impinges. Peraeopods 3—5 in both sexes very slender and long, with slender spines, Cheirocratus 419 the 24 joint distally a little tapering. Uropod 3, peduncle long, more than half as long as rami. Telson about °/, as long as peduncle of uropod 3, cleft rather wide, ?/, of length, apices obliquely truncate from within outward, armed with 3 unequal spines. Colour orange, mottled with rose-red; golden yellow, mottled all over with small red specks, an opaque whitish patch on front part of peraeon; segments and side-plates spotted with scarlet, margins of antennae 1 and 2 and basal joint of legs scarle. L. 8—10 mm. Arctie Ocean and North-Atlantie with the adjoining seas (Europe from Lofoten Isles round to Naples and Constantinople). Depth 0—112 m. 2. C. intermedius O.Sars 1894 C.i., G. ©. Sars, Crust. Norway, v.1 p.527 t.186 £.1 | 1896 ©. i., T. Scott in: Rep. Fish. Board Seotl., v. 14 p. 160 t.4 £.7. Closely resembling C. sundevallii. Head, lateral lobes slightly constricted at base, post-antennal corners projecting beyond them. Side-plate 1 little expanded distally, 24 in d much deeper. Pleon segment 3, postero-lateral corners acutely and considerably produced. Antenna 1, flagellum subequal to peduncle Gnathopod 2 in J, 6% joint very large, tumid at base, palm oblique, - longer than hind margin, concave, densely setose, defined by an obtuse prominence with a bifid dentiele and 2 others, having also 2 distant submarginal dentieles, and near the finger-hinge 2 or 3 prominent tubereles, finger curved, shorter than palm and impinging upon its edge, not elosing against the surface of the joint. Uropod 3 long, rami little longer than peduncle. Telson scarcely longer than broad, cleft wide, apices arımed with 5 spines, 1 longer than the rest. Colour pale yellow with irregular patches of vivid carmine. L. Q reaching 11 mm. North-Atlantie and North-Sea (South- and West-Norway up to the Trond- hjemsfjord, in moderate depths; Firth of Forth). 3. C. robustus O0. Sars 1894 C. r., G. O. Sars, Crust. Norway, v.1 p. 526 t.185 £.2. Very like C. sundevallii. Body comparatively stouter, with side-plates smaller, 24 in C only a little deeper than the others, pleon segment 3 with postero-lateral eorners rather more produced. Antenna 1 as long as peduncle of antenna 2, flagellum longer than peduncle, 22-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal. Gnathopod 1, 6% joint as long as 5tb, Gmathopod 2 in J, joints short except 6%, which is very large, tumid, ovate, inner face densely clothed with short setae, palm on inner surface, slightly concave, armed with 1 tubercle to meet point of finger. Peraeopods 3—5 strongly built, especially in JS, peraeopod 5 much the strongest, 4 —6th joints broad, compressed, finger small. Telson broader than long, 5 not very unequal spines at each apex. Colour pale yellow with small red spots. L. © nearly 10 mm. n Christianiafjord and Trondhjemsfjord. Moderate depths. 4. C. assimilis (Lilj.) 1851 Gammarus a., W. Liljeborg in: Öfv. Ak. Förh., v.8 p.23 | 1871 Cheirocratus a., A. Boeck in: Forh. Selsk. Christian., 1870 p. 214 | 1876 C. a., A. Boeck, Skand. Arkt. Amphip, v.2 p.398 t.24 f.3 | 1889 C.a., A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.129 t.10 £.13; t.11 £.11] 1893 C.a., A. Della Valle in: F. Fl. Neapel, v.20 p.688 t.20 f.1, 2, 5—23, 26, 28,29 | 1894 C.a.,, G. ©. Sars, - Crust. Norway, v.1 p.528 t.186 f.2 | 1867 C. mantis, A. M. Norman in: Nat. Hist. Tr. 'Northumb., v.1 p.13 t.7 f.14, 15. Body as in C. intermedius, post-antennal corners of head even more produced, postero-lateral angles of pleon segment 3 rather less. Gnathopod 2 97* 420 Cheiroeratus, Megaluropus in 8 much elongated, 6!" joint widening distally, with faseicles of spinules on both edges, palm much shorter than hind margin, scarcely setose, defined by a slender tooth and spine, divided into 3 unequal teeth, and minutely trilobed near finger-hinge, finger strong, faleiform, dilated in the middle, impinging against palmar tooth.. Peraeopods 3—5 nearly as in C. robustus (p. 419), but here peraeopod 5 still longer. Uropod 3, rami rather broad, twice as long as peduncle. Telson much broader than long, each of the concave apices carıying 3 spines, the central longest. Colour pale yellow, mottled with small red spots. Gmathopod 2 in Q, transverse rows of setae of 5th joint appear to want the hamate character conspieuous in ©. sundevallii (p. 418) (Norman). L. 13 mm. Distribution appears to be nearly the same as that of ©. sundevallii (p. 418). 29. Gen. Megaluropus Hoek 1889 Megalonoura (Sp. un.: M.agilis) (nom. nud.), (A.M. Norman in MS.) (A. 0. Walker in:) Herdman in: P. Liverp. biol. Soe., v.3 p.39 | 1889 Megaluropus (Sp. un.: M. agilis) (Megaloura A. M. Norman in MS.), (A. M. Norman in MS.) Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.197, 198 | 1889 Megaluropus, A. M. Norman in: Ann. nat. Hist., ser.6 v.3 p.446 | 1889 M., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v2 p: 260 | 1893 M., A. Della Valle in: F. Fl. Neapel, v.20 p. 694. Head with small, acute rostrum and very prominent lateral lobes, on which the eyes are placed. Antenna 1 much shorter than antenna 2, accessory flagellum very small. Upper lip broad, apically bilobed. Lower lip with inner lobes. Mandible, maxillae 1 and 2 and maxillipeds normal. Maxilla 1 with several setae on inner plate, 11 (?) spines on outer. Maxilla 2, inner plate fringed on inner margin. Gmathopod 1 simple; gnathopod 2 larger, simple or feebly subchelate. Peraeopod 5 elongate, finger stiliform. Uropod 3 much produced, rami equal, membranaceous, apically rounded. Telson eleft to the base. 1 species. 1.M.agilis Hoek 1889 M.a., (A.M. Norman in MS.) Hock in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p. 197, 260 t.7 1.7; 1.8 £.3, 3d,f,1; t.9 f.3g,h,i,k | 1889 M. a, A.M. Norman in: Ann. nat. Hist.. ser. 6 v.3 p.446 t.18 £.1— 10; v.4 p. 128 t. 10 f.15--17 | 1893 M.a.. A. Della Valle in: F. Fl. Neapel, ©.20 p. 695 t.3 f.9; t.34 f.1—17 | 1895 M. a., A. O. Walker in: P. Liverp. biol. Soe., ©.9 p.309 | 1890 Cheirocratus drechselii, Meinert in: Udb. Hauchs, v.3 p.170 t.2 f. 48—52. Pleon segment 3 (and perhaps also 4 and 5) with hind margin dorsally serrate. Head, rostrum reaching nearly middle of 1° joint of antenna 1, lateral lobes rather broad, abruptly sharpened at apex, reaching much beyond rostrum. Side-plate 1 a little widened distally, 24 larger, 34 irregularly elliptie, with concave hind margin, 4 largest, scarcely emarginate. Pleon segment 3, postero-lateral . corners quadrate, the postero-lateral margin serrate, with a eilium between every 2 or 3 teeth. ‚Eyes red, occupying all but the apex of lateral lobes of head, and in the J passing upward behind base of autenna 1. Antenna 1 rather short, 1° joint not longer, and in C rather shorter than 24, 34 joint very short, flagellum 6—-8-jointed, with sensory filaments but without calceoli, accessory flagellum 2-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, very long, flagellum in © with 8 joints, in C with 16 joints, which are long and slender, without calceoli or filaments. Gmathopod 1, 5% joint oblong ovate, broader than 6®h, which is of a tapering form, the long palm scarcely distinguished from the short hind margin, finger strong, eurved. Gnathopod 2, 5! joint in © longer Megaluropus, Melita 421 taan 6%, widening distally, 6!" joint not more than half as broad, with palm nearly asin gnathopod 1, but more defined and rather shorter. Gnathopod 2 in d, 5tk joint shorter and not much broader than 6%, which is long oval, palm ill-defined. Peraeopods land 2, 24 joint bent, distally widened. Peraeopods 3 and 4, 24 joint wider below than above, 4!" joint wide, longer than any of the following joints. Peraeopod 5, 24 joint well expanded, produced behind in rounded lobe below the 34 joint, 4— 7!" joints elongate, and except the 4! slender. Uropod 1, rami equal, shorter than pedunele. Uropod 2. rami unequal. Uropod 3, the broad rami setose in JS. Telson much longer than broad, the convex outer margin of each lobe fringed with setules. Colour variegated with erimson, orange, and white. L. 4—5 mm. Kattegat; North-Sea (Holland, Firth of Forth); Firth of Clyde; Liverpool Bay; English Channel, Bristol Channel (Devon, Jersey); Gulf of Naples. Surface and various depths to 36 m. 30. Gen. Melita Leach 1813/14 Melita (Sp. un.: M. palmata), Leach in: Edinb. Ene., v.7 p.403 | 1876 M., A. Boeck, Skand. Arkt. Amphip., ”.2 p. 384 | 1893 M., A. Della Valle in: F. Fl. Neapel, v.20 p.707 | 1894 M., G: OÖ Sars, Crust. Norway, e.1 p.507 | 1875 Paramoera (part.), Miers in: Ann. nat. Hist.. ser. 4 v.16 p. 75. Body slender, peraeon smooth, pleon usually with 1 or more of the segments dorsaliy dentate and armed with bristles. Head not rostrate, lateral corners rounded. Side-plate 4 the largest, emarginate behind. Eyes usually distinet, rather small. Antenna 1 slender, longer than antenna 2, 1° and 24 joints rather long, 39 not short, with accessory flagellum. Mouth-parts, so far as known, normal. Upper lip with small central emargination. Lower lip, inner lobes tolerably distinet. Mandibular palp rather slender. Maxilla 1, inner plate with several setae, outer with 11 spines. Maxilla 2, inner plate sometimes with setae on inner margin. Maxillipeds, outer plates with teeth on inner margin, passing into slender spines on apex. Gnathopod 1 small, subchelate. Gnathopod 2 larger, often unequal, and one in the d sometimes much larger than the other, sometimes approximately chelate. Peraeopods 3—5, 24 joint well expanded. Peraeopods 4 and 5 subequal, longer than others. Branchial vesieles simple. Marsupial plates narrow. Uropod 2 the shortest. Uropod 3 projeeting much beyond the others, outer ramus long, 24 joint wanting or rudimentary, inner ramus very short. 'Telson small, deeply cleft. Some characters subjeet to much variation within the species. 12 accepted and 7 doubtful speeies. Synopsis of accepted species: n j Without eyes. ........- N 1:36 pallide: . ;. p. 422 \ With eyes — 2. 0 | Eyes searcely pigmented'. -. . ....... 2. M. quadrispinosa . p.422 Eyes darkly pigmented —- 3. 3 | Gnathopod 2 in S, one of the pair chelate . 3. M. fresnelü . . . . p.423 Gnathopod 2 in S subehelate — 4. 4 [ No pleon segment dorsally dentate — 5. | At least 1 pleon segment dorsally dentate — 6. 5 { Peraeopods 8—5 slender. ....2.... 4. M. nitida ... .. p. 424 Peraeopods 3—5 rather strongly built... . 5. M. pellueida. . - . p.424 6 { Pleon segment 4 not dentate.. .... .» . 6. M. coroninii. . . . p.424 Pleon segment 4 dentate — 7. 422 Melita Pleon segment 4 produced to a single dorsal kohle a N 7. M. palmata . . . . p.425 ‘] Pleon segment 4 produced to more than 1 dorsal tooth — 8. 8 j Gnathopod 2 in d, finger ending obtusely . . 8. M. obtusata. . . . p.4236 \ Gnathopod 2 in d, finger ending acutely — 9. Q j Pleon segment 3 not dorsally dentate. .. . 9. M. amoena . . . . p.426 \ Pleon segment 3 dorsally dentate — 10. Pleon segmeuts 2 and 3 each with a single 10 | dorssl Mmothh:.. 20% Den 10. M. formosa . . . . p.427 | Pleon segments 2 and 3 each with several dorsal teeth — 11. Teeth ou pleon segments 1--6 ranging from | 3 to 11, side-plates 1— 4 shallow . . . . 11. M. dentata ... . . p.427 | Teeth on pleon segments 1—# usually limited to 3, side-plates 1—4 rather deep. . . . 12. M. gladiosa . . . . p.428 ıl 1. M. pallida O.Sars 1879 M.p., G. ©. Sars in: Arch. Naturv. Kristian., #4 p. 457 | 1885 M.p., G. O. Sars in: Norske Nordhavs-Exp.. v.6 Crust. ı p. 179 t.15 f.1, la-l | 1893 M.p., A. Della Valle in: F. Fl. Neapel, v.20 p. 716. Back rounded, but body greatly 'compressed, pleon segments 1—5 each produced into a pair of dorsal adpressed teeth, between which there are 2—4 smaller dentieles. Side-plates 1-4, lower margin quite smooth. Pleon segments 2 and 3, postero-lateral corners acutely produced, in segment 3 upward curving. Eyes entirely wanting. Antenna 1 nearly as long as body, 24 joint not longer than 1°, flagellum longer than peduncle, filiform, 24-jointed, accessory flagellum 3-jointed. Antenna 2 about half as long as antenna 1, ultimate and penultimate joints of peduncle equal, flagellum 11-jointed. Mandibular palp short and slender, 34 joint acute, ending in 2 simple setae. Maxilla 1, inner plate with numerous setae, outer with strong spines, 24 joint of palp slender, curved, with a few delicate spines at apex. Maxillipeds, 34 joint of palp distally dilated, setose, finger short, conical. Gnathopod 1, 6% joint as long as 5th, abruptly truncate at palm. Gnathopod 2, 6% joint large, oval, palm rather oblique, defined by a projecting corner, armed with a short spine. Peraeopods 3—5, 24 joint indistinctly serrate behind. Uropod 3 the longest, outer ramus more than twice as long as peduncle, armed with few spines, rudimentary inner ramus bare. Telson much shorter than pedunele of uropod 3, cleft to base, lobes scarcely dehiscent, narrowly truncate apices each with a setule. Colour uniform white. L. reaching 26 mm. Arctie Ocean (west of Spitzbergen). In cavities (work of Teeredo?) in wood dredged from 2510 m. \ 2. M. quadrispinosa Vosseler 1889 M. q., Vosseler in: Arch. Naturg., o.551 p. 157 t.8 f.15—24 | 1893 M. palmataQ ?, A. Della Valle in: F. Fl. Neapel, v.20 p. 716. Very like M. dentata (p. 427). Pleon segment 4 produced to 1 strong dorsal tooth, segment 5 to 3 weaker teeth. Pleon segments 2 and 3, postero- lateral corners acutely produced, and in segment 3 upturned. Body slender, strongly eompressed. Eyes small, scarcely pigmented. Antenna 1, accessory flagellum 3-jointed. Antenna 2, flagellum scarcely longer than penultimate joint of peduncle. Mandibular palp thin, with few setae. Maxilla 1 with few setae (very numerous in M. dentata) on inner plate. Gnathopod 1, 5" joint much longer (in figure) than the oval 6%, which has a palm, though weakly defined, 5t" and 6th joints both setose on hind margin. Gnathopod 2, 5% joint not short, 6th longer and broader, oval, palm weakly defined, finger eurved, Melita 423 acute, not especially large, and seemingly not closing against surface of 6tk joint. Peraeopods 3—5, 24 joint broadly oval. Uropod 3, outer ramus long, inner reduced to a small scale, peduncle longer than the telson. L. 11'5 mm. Arctic Ocean (Spitzbergen). 3. M.fresnelii (Aud.) 1826 Gammarus f., Audouin in: Deser. Egypte, v. lıv p. 93 Crust. t.11 f£.3 | 1830 Amphithoe f., H. Milne Edwards in: Ann. Sei. nat., v.20 p- 377 | 1875 Melita f., Paramoera (part.), Miers in: Ann. nat. Hist., ser. 4 v. 16 p.75 | ‘1893 M.f., A. Della Valle in: F. Fl. Neapel, v.20 p.708 t.60 £.6 ; 1845 Gammarus anisochir, Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.817 t.2 f. 1a—p | 1852 @. (Maera) validus + @. (M.) pilosus + G. (M.) setipes, J. D. Dana in: P. Amer. Ac., %.2 p.212, .213 | 1853 &55 M.valida+ M.s.+ M. anisochir, J. D. Dana in: U. S. expl. Exp., v.1311 p.966 t.66 f.6; p.967 t.66 f.7; p.968 1.66 f.8 | 1862 Melita v.+ M.s.+ M. a. + M. fresnelli, Bate, Cat. Amphip. Brit. Mus., p.185 t.33 f£.7; p. 186 t.33 f.8; p. 186 t.34 f.1; p.186 t.34 f.2 | 1864 M. exilii, Fritz Müller, Für Derain; p-6 f. 1879 M. australis, Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.264 t.9 £.6, 7 | 1890 M. cotesi, G. M. Giles in: J. Asiat. Soc. Bengal, 0.59 p.64 t.2 £.1. Peraeon quite smooth. Pleon segment 1, a small median tooth flanked on each side by 3 larger teeth and an outer rudimentary tooth; segment 2 similar, but median tooth comparatively smaller, and outer teeth larger; segment 3 with 7 teeth, the outermost on each side furcate; segment 4 with 5 teeth. 2 large, the middle and outer small; segment 5 with 2 rather long teeth. Side-plates I—4 tolerably large, setose on the lower margin, 1° with ‚dentiecle at lower hind comer. Pleon segment 3, postero-lateral corners produced to a long tooth, serrate on its upper margin. Eyes dark, nearly eireular. Antenna 1 nearly */, length of body, 1° joint shorter than 24, 34 scarcely ?/, as long as 24, flagellum much longer than peduncle, 40-jointed, accessory flagellum more than '/, of primary, 6-jointed. Antenna 2 a little shorter, ultimate joint of pedunele slightly shorter than penultimate, flagellum ?/, as long as peduncle, about 20-jointed. Mandible, 10 spines in spine-row, palp slight, but a little longer than the trunk. Maxilla 1, inner plate with 10 setae. Gnathopod 1 small, 6% joint oval, broader than 5t%, both setose, finger short, ‚pointed, strongly curved, seemingly not very freely movable. Gnathopod 2 in Q.similar to gnathopod 1, but longer and larger, 6% joint longer but not proportionatelvy broader, palm and inner margin of finger finely denti- culate (as seen in M. australis Haswell). Gnathopod 2 in J, the right limb nearly as in O, the left quite different, 24 joint rather dilated, 4" produced to a backward-directed point, 5t% very small, 6!" and finger forming a sort of &hela; the 6% joint, instead of being shorter than 24, is more than twice ‚as long, and of great breadth, its hind margin longer than the front, produced to a great spoon-shaped tooth, between which and the finger-hinge are 3 teeth or tubereles, the finger long, massive, slightly sinnous and apically blunt. Peraeopod 1 rather longer than peraeopod 2. Peraeopods 3—5, 24 joint minutely serrate behind. Peraeopod 4 slightly longer than peraeopod 5. Uropod 1, rami about equal to pedunele and one to other. Uropod 2, rami rather longer than peduncle. Uropod.3, outer ramus nearly twice as lung as peduncle. inner ramus small, almost linear. Telson cleft nearly to base, lobes conical, widely dehiscent, apices curved a little inward. Colour elouded yellowish grey, thumb of chela porcelain-white. L. about 13 mm. (Diagnosis taken especially from Kroyer’s account). Red Sea? (Egypt); Atlantic (Rio Janeiro, depth 11—13 m; Desterro); Indian Ocean (Andaman Islands, shallow water; Singapore, depth 3 m); Port Jackson [East- Australia]. a . 424 Melita 4. M.nitida S.I.Sm. 1873 M. n., (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm.,. v.1 p.560 | 1893 M.n., A. Della Valle in: F. Fl. Neapel, v.20 p. 716. Pleon segments 1—6, none serrate or emarginate, segment 5 with & several slender spines on each side near median dorsal line. Eyes small, round, black. Antenna 1 about °/, as long as body, 24 joint slightly longer than 1°, nearly twice as long as 34, flagellum longer than peduncle. Antenna 2 shorter, but with longer peduncle, ultimate joint of pedunele rather longer than penultimate. Gnathopod 1, 5t% joint longer and broader than 6%", which is oblong, slightly curved, finger very small but stout, curved, attached in noteh of apex of 6 joint, not elosing on palm but projecting inwards. Gnathopod 2 stout, 5th joint short, triangular, 6% somewhat oval, palm oblique, arcuate, conti- nuous with hind margin, with spinules and stiff hairs, tip of finger resting within the palmary margin. Peraeopod 1 rather longer than peraeopod 2. Peraeopods 3—5, 24 joint minutely serrate behind. Uropod 2 not reaching quite so far as uropod 1. Uropod 3 very long, with fascieles of spines along the margins. Lobes of telson slender, with spines at the tips. Colour dark greenish-slatee L. 7--9 mm. North-Atlantie (New Jersey to Cape Cod). Near low-water mark. 5. M. pellucida O. Sars 1882 M.p.,. G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.106 t.5 £.9, 9a, b ! 1894 M.p., G. O. Sars, Crust. Norway, v.1 p.511 t.180 f. 2. Body rather slender, with no dorsal teeth, but some simple bristles on pleon segments 4 and 5. Head, lateral corners broadly rounded, post- antennal corners to the rear but distinet. Side-plate 1 expanded distally, 4!h quadrate below the emargination. Pleon segment 3, postero-lateral corners acute, but scarcely produced. Eyes small, rounded oval, black. Antenna 1 about °/, as long as body, 1° joint fully as long as 24, 34 more than half as long as 24, flagellum nearly twice as long as peduncle, 18-jointed, accessory flagellum very small, 1-jointed. Antenna 2 scarcely more than '/, as long as antenna 1, ultimate and penultimate joints of peduncle subequal, together longer than flagellum. Gmathopod 1, 6! joint little more than !/, as long as 5, subquadrate, palm distinetly defined, transverse. Gmatho- pod 2 in © larger, 6! joint a little longer than 5" and broader, oval, but with palm nearly transverse, defined by a distinet angle and 2 palmar spines, in © similar, but with 5tk joint shorter, and 6" considerably larger. Peraeopods 3—5 rather strongly built, 24 joint rather broadly oval. Uropod 3, peduncle about '/, as long as outer ramus, which has apex obliquely truncate, armed with many unequal spines, inner ramus not twice as long as broad. Telson broader than long, not cleft to the base, the dehiscent lobes obtusely rounded, with several apical spines. Colour whitish, pellueid. L. © 6 mm, Q considerably less. South-Norway (brackish basin inside the Listerland). Ä 6. M. coroninii Heller 1866 M.c., Cam. Heller in: Denk. Ak. Wien, v.26n p-37 t.3 f£.20, 21 | 1893 M. palmata (part.) A. Della Valle in: F. Fl. Neapel, v.20 p.714. Pleon segments 1—4 entirely unarmed, segment 5 produced into 3 dorsal denticles with a bristle in each of the intervals ‘(the figured small 7th segment is an error). Eyes small, round, black. Antenna 1 almost as long as body, 24 joint longer than 1°, flagellum of more than 40 joints, accessory flagellum of 4 rather elongate, joints. Antenna 2 shorter, flagellum much shorter than peduncle, about 20-jointed. Gmathopod 1, 6! joint shorter than 5%, narrow proximally, distally a little widened, palm short, defined by a projeeting rounded lobe, behind which the point of the finger closes down. Gmathopod 2, 6! joint in J rather tumid, oval, palm weakly Melita 425 defined, finger strongly curved, closing - against inner surface of 6% joint. Peraeopods 1 and 2 slender. Peraeopods 3—5 stouter, 24 joint oval, pretty well expanded. Uropods 1—3 as usual in the genus. Telson with lobes about reaching end of peduncle of uropod 3. L. 10—11 mm. Adriatie (Lesina). 7. M. palmata (Mont) 1804 Cancer palmatus, Montagu in: Tr. Linn. Soc. London, 0.7 p.69 t.6 f.4 | 1812 Astacus p., Pennant, Brit. Zool., ed.ö v.4 p.35 | 1813/14 Melita palmata, M. palmeta, Leach in: Edinb. Ene., 0.7 p.408, 432 | 1876 M. palmata, A. Boeck, Skand. Arkt. Amphip., v.2 p. 387 t.24 f.4 | 1878 M.p., Zaddach in: Schr. Ges. Königsb., v.19 Abh. p.52 f.4 ! 1889 M.p., A.M. Norman in: Ann. nat. Hist., ser.6 v.4 p.132 | 1893 M. p. (part.), A. Della Valle in: F. Fl. Neapel, ».20 p. 713 t.1 £.6; t.23 f.24—40 | 1894 M.p., G. O. Sars, Crust. Norway, v.1 p.508 t.179 | 1818 Gammarus palmatus, Lamarck, Hist. An.s. Vert., ©.5 p.181 | 1830 @. dugesü, H. Milne Edwards in: Ann. Sei. nat., v.20 p.368 | 1857 0. inaequimanus,. Bate in: Ann. nat. Hist., ser.2 v.19 p. 145. e Pleon segment 4 produced dorsally to a compressed tooth, segment 5 »to 2 small contiguous dentieles, each with a bristle at the base. Head, a small rounded projeetion in the rostfal position, post-antennal corners separated by a small ineision from the lateral corners. Side-plate 6 in © (not in C, as Boeck asserted) having the front lobe produced below to a spiral process. Pleon segment 3, postero-lateral corners slightly produced, acute. Eyes very small, roundish, dark brownish. Antenna 1 more than '/, as long as body, 22 joint rather longer than 1°, 34 about half 24 or less, flagellum longer than peduncle, 20-jointed, accessory flagellum 2-jointed. Antenna 2 much shorter, ultimate and penultimate joints of pedunele subequal, flagellum short, sometimes with 10 joints. Maxillipeds, 34 joint of palp distally widened, finger with setules on inner margin. Gmnathopod 1 very small, 6th joint much shorter than 5%, widening distally, palm transverse; (Sars: finger in oO well defined, in C obtuse and immovable; but Zaddach and others: sth joint in J on its front border deeply emarginate and so obliquely that the emargination is larger on the inner than on the outer side, whereby arises an upper and an under process, the finger being placed in the emargination on the outer surface, and moving so obliquely that in repose it rests on the inner side of the under process, its place of insertion being protected by a chitinous process on each side). The finger ends in an acute hook. Gnatho- pod 2 large in Q, 5!" joint expanded distally to a broad setiferous lobe, 6th broad, ovately oblong, palm rather oblique, with a few spines at the obtuse angle; in 3 very large, 5t% joint short, eup-shaped, 6!" much expanded, widest at palm which is somewhat variable, sometimes where it meets hind margin much projecting and rounded off (Sars), at others, slightly oblique and angular, with a strong group of setae on the adjoining surface, finger eurved, acute, folding down on to the inner concave surface of 6 joint. Peraeopods 3—5 much stouter than peraeopods 1 and 2, 24 joint broadly oval, very slightly serrate, peraeopods 4 and 5 much longer than 34, terminal joints overturned baekward. Finger in maxillipeds and all the limbs ending in a nail, finger short in peraeopods 1—5. Uropods 1—3 of the usual character, Telson about reaching end of pedunele of uropod 3, with lobes rather narrow, widely divergent, each carrying 4 spinules on truncate apex, and 3 stronger spines on projection of inner margin (Sars); divided to the base, each lobe very acute, with slight indent on the outer margin (Della Valle). Colour pale brownish yellow. L. 8—16 mm. North-Atlantie with the adjoining seas (Europa: Great Britain, West-Norway, Baltie ete.; Azores). 426 Melita 8. M. obtusata (Mont.) 1813 Cancer (Gammarus) obtusatus, Montagu in: Tr. Linn. Soe. London, v.11 p.5 t.2 £.7 | 1818[?] @. o., Latreille in: Tabl. ene. meth., Crust. Arach. Ins. t.336 f,29 | 1830 Amphithoe obtusata, H. Milne Edwards in: Ann. Sei. nat., v.20 p.877 | 1879 Melita o., Hoek in: Tijdschr. Neder!. dierk. Ver., v.4 p. 140 t.10 f.8, 9 | 1889 M.o., A.M. Norman in: Ann. nat. Hist., ser.6 v.4 p.132 | 1893 M. o. (part.). A. Della Valle in: F. Fl. Neapel, v.20 p.711 t.1 £.7; 1.23 £.1—19; & ?juv. p. 713 t.3 f.14; t.23 f.20—23 | 1894 M.o., G.O.Sars, Crust. Norway, v.1 p.510 t. 180 f.1 | 1852 Gammarus maculatus (non G. Johnston 1827!), W. Liljeborg in: Öfv. Ak. Förh., c.9 p.10 | 1853 @. obtusunguis, A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.176 | 1862 Melita obtusata + M. proxima + Megamoera alderi, Bate, Cat. Amphip. Brit. Mus., p.183 t.33 f.3; p.184 t.33 f.4; p.228 t.40 f. 1. Pleon segments produced to variable number of teeth. Head, lateral corners broadly rounded, post-antennal corners forming a minute tooth. Side-plates 1—4 rather deep, 1% a little widened distally, 1°:—34 with den- ticle at lower hind corner. Pleon segment 3, postero-lateral angles much produced, acute, upturned, margins smooth or slightly serrate. Eyes small, round, dark. Antenna 1 more than \, as long as body, 24 joint rather longer than 1°*, flagellum longer than peduncle, flagellum about 16-jointed. (Sars), accessory flagellum 4-jointed, last joint minute. Antenna 2, ultimate joint of pedunele rather shorter than penultimate, flagellum subequal to both com- bined. Mandibular palp very narrow, joints successively longer. Gnathopod 1, 6 joint as long as 5%, rather broad, somewhat triangular, palm oblique, ill-defined. Gnathopod 2 larger in Q, 6 joint longer than 5th, oblong oval, palm rather oblique, defined by an obtuse angle; in J 5!" joint short, cup-like, 6!" very large, tumid, widest at palm, which is irregularly serrated, and hollowed near the triangular defining lobe; finger, which eloses into the cavity, is scimitar-shaped, its obtuse apex rounded above and squared below; (Bate: palm sometimes less sinuous and more irregularly denticulate). Peraeo- pods 3—5, 24 joint oval, hind margin distinetly serrate. Uropod 3, outer ramus ending in a strong spine, which perhaps represents a 24 joint, about once and a half as long as peduncle, inner ramus very small. Telson not nearly reaching end of peduncle of uropod 3, eleft nearly to base, lobes dehiscent, acute, with some spinules on inner margin. Colour pale brown, mottled with rufous brown, especially about the legs (Montagu). L. 6—9 mm. North-Atlantie.with the adjoining seas (from West-Norway round Europe to Italy). 9. M. amoena H. J. Hansen 1887 M.a., H. J. Hansen in: Vid. Meddel., ser. 4 e.9 p.147 t.6 f.1, la | 1898 M. obtusata (part.), A. Della Valle in: F. Fl. Neapel, 2.20 p. 711. d. Body somewhat compressed, pleon segment 1 with 1 very little dorsal tooth, segment 2 with 5, middle small, other 4 very minute, segment 3 unarmed, segment 4 with 2 rather small teeth, segment 5 with 2 minute teeth. Head, post-antennal corners not dentiform. Side-plates 1—4, lower margin broadly rounded, 18t the smallest. Pleon segment 2, postero-lateral corners produced to a process rather long, narrow, obtuse, corners of seg- ment 3 acute, upturned. Eyes small, round. Antenna 1 about ’/, as long as body, 1° joint rather shorter than 24, flagellum shorter than peduncle, accessory flagellum 4-jointed, last joint minute. Antenna 2, ultimate and penulti- mate joints of peduncle subequal. Gmnathopod 1, 6% joint shorter than 5th, much longer than broad, palm very oblique. Gnathopod 2, 5th joint very short, cup-shaped, 6! very large, about twice as long as broad, palm very oblique, longer than hind margin, irregularly dentate, finger long, the acute apex elosing behind the little triangular lobe which defines the palm. Peraeo- pods 3—5, 24 joint much expanded, in peraeopods 4 and 5 not '/, longer than Kr an in ra N rt Kan BE a ee rk Melita 427 broad. Uropod 3, outer ramus not quite twice as long as peduncle, inner very minute. Colour whitish. L. 8:5 mm. Ikertokfjord [West-Greenland|. Depth 56 m. 10. M. formosa J. Murdoch 1866 Gammarus dentatus (part.), Goes in: Öfr. Ak. Förh., v.22 p.530 t.40 f.29° | 1885 Melita formosa, J. Murdoch in: P. U. S. Mus., v.7 p.520 | 1887 M. goösii, H. J. Hansen in: Dijmphna Udb., p. 228 t.21 f.13 | 1887 M.g., H.J Hansen in: Vid. Meddel., ser.4 v.9 p.146 t.5 f.8 | 1893 M. obtusata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 711. z Close to M. dentata. Pleon segments 2 and 3 produced each to 1 dorsal tooth, segment 4 to 3 teeth, segment 5 to 4, all very small. Pleon segments 1—3, postero-lateral corners acute, in segment 3 produced upward. Antenna 1, 1° joint not quite so long as 24. Gnathopod 1, 6% joint oval, fringed with long hairs on hind margin. Gnathopod 2, 6!" joint in JS broadly oval, armed on the hind margin with 3 or 4 blunt teeth and running out into a broad blunt tooth, palm minutely denticulate, finger large, curved, acute, shutting on the inside of the palm. Uropod 3, inner ramus ovate. Colour purple, with lighter streak down middle of back (Murdoch). Hansen adds: body depressed, lateral corners of head produced into a long, acute process; side-plates 1—4 shallow; peraeopods 3—5, 24 joint long and narrow, with front and hind margins subparallel; uropod 3, outer (not inner!) ramus very long; colour red. L. 17':5—21 mm. . Arectie Ocean (arctic Alaska; Jugor Schar, depth 19—23 m; Veoskrlitechlend, depth 66 m; Spitzbergen, depth 19—75 m). 11. M. dentata (Kroyer) 1842 Gammarus dentatus, Kroyer in: Naturh. Tidsskr., v.4 p.159 | 1866 @. d. (part.), Goes-in: Öfv. Ak. Förh., 0.22 p.530 t.40 f.29 | 1862 Megamoera dentata, Bate, Cat. Amphip. Brit. Mus., p.225 t.39 f.4 | 1871 Melita d., A. Boeck in: Forh. Selsk. Christian., 1870 p.211 | 1876 M.d.(part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.389 t.23 f.10 | 1884 M.d., J.S. Schneider in: Tromss Mus. Aarsh., v.7 p-113 | 1889 M.d., A.M. Norman iin: Ann. nat. Hist.. ser. 6 v.4 p.135 | 1894 M. d. (part.), G.O.Sars, Crust. Norway, v.1 p.513 t. 181 f.1 | 1853 Gammarus purpuratus, Stimpson in: Smithson. Contr.; v.6 nr.5 p.55 |, 1893 Melita palmata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 713. Elongate, eompressed, but with rounded back. Pleon segments 1—6 produced dorsally to several teeth, of which median usually the largest, numbers very variable. Head, post-antennal corners short, dentiform. Side- plates 1—4 shallow, 1° scarcely expanded distally, 1:—34 with lower hind corner dentiform. Pleon segment 3, postero-lateral corners acutely produced, slightly upturned. Eyes small, rounded oval, black. Antenna 1 nearly as long as body, 1° joint with spines on lower margin, a long one at apex, 24 joint longer, 34 about '/,—", of 24; flagellum longer than peduncle, 36—46- jointed, accessory flagellum 4—9-jointed. Antenna 2, peduncle long, ultimate and penultimate joints subequal, flagellum short, about 13-jointed. Mandibular . palp rather slender, 1° joint produced to a dentiform projection, 3% and 24 subequal, or 32 the longer. Maxilla 1, outer plate. witlı 7—9(?) spines. Gnathopod 1 densely setose, 6!" joint (Sars) about aslong as 5", oblong oval, palm rather oblique, defined by an obtuse angle; (Norman: 6% joint ovate, much shorter than 5%, palm defined by a small tooth-like process, very minutely erenulated and spinulose, finger faleate, its inner margin divided up into minute teeth of peeuliar form, widening in the middle and apieulate). Gnathopod 2 much stronger, 5% joint rather short, 6tk rather large, especially in C, oblong, a little widening to the oblique slightly denticulated palm, which is defined by a tooth-like process, and in C is angular near the finger-hinge, finger 428 Melita large, curved, acute. Peraeopods 1 and 2 slender,; short. Peraeopods 3—5 successively longer, 24 joint large, oblong oval, hind margin serrate, with the lower hind corners rounded or subangular. Uropod 3, outer ramus very long, sublinear, fully twice as long as peduncle, ending in 4 spines, the largest per haps representing a 24 joint, inner ramus very small. Telson not nearly reaching end of peduncle of uropod 3, lobes acute, each with 2 spines inside the point, 1 setule outside. Colour varying with the surroundings (Schneider); uniform dark purple, never varying (Stimpson). L. 11—22(—27°5?) mm. Arctic and Seandinavian waters; North-Atlantice (Halifax [Nova Scotia], Labrador, Grand Manan, Northumberland). Down to 113 m. 12. M. gladiosa Bate 1862 M.g., Bate (& Westwood), Brit. sess. Crust., v. 1 p.846 f. | 1862 M. g., Bate, Cat. Amphip. Brit. Mus., p.185 t.33 f.6 | 1876 M. g,, T. Stebbing in: Ann. nat. Hist., ser. 4 o.17 p.77 t.4 f.2, 2a—d | 1889 M.g., A.M. Norman in: Ann. nat. Hist., ser.6 v.4 p.134 | 1893 M. obtusata (part.). A. Della Valle in: F. Fl. Neapel, v.20 p.711. Near to M. obtusata (p. 426). Pleon segments 1—6 each with 3 dorsal teeth, but sometimes segments 1, 5 and 6 with more or fewer, or 1° with none; teeth large on segments 1—4, except central of segment 4, teeth on segment 6 very small. Pleon segment 3, postero-lateral corners acutely produced, upturned, their upper and under margins serrate. Gmathopod 1, 5! and 6% joints equal and similar, broadly oval, palm scarcely defined, hind margin of 4 — 6" joints with dense fringe of fine short hairs, as in M. obtusata O. Gmathopod 2 in 9 without the fur seen in gnathopod 1, not much larger, 5t" joint less broad, 6! equal in breadth but longer, palm defined by a "small tooth. Gnathopod 2 in S much larger, 5" joint short, cup-shaped, 6" large, broad, palm serrate, strongly sinuous, with an abrupt eurve at the middle, finger scimitar-shaped, broad almost to the end, but with an acute apex. North-Atlantie (South-West-England: North-East-Seotland; Boulugne and West- France; Azores). M. appendiculata (Say) 1818 Gammarus appendiculatus, Say in: J. Ac. Philad., v.111 p.374|1845 @.a., Kreyerin: Naturh. Tidsskr., ser.2 v.1 p.326 | 1862 @. a., Podocerus (part.)?, Bate, Cat. Ampkip: Brit. Mus., p.223, 224 | 1888 Maera? a., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 103 | 1893 Cerarloeus?.a., A. Della Valle ; in: F. Fl. Neapel, v.20 p. 765. Peraeon segments 5—7 and pleon segments dentated on their Basler edges. L..7—8 mm. * United States of America (Georgia). M. confervicola (Stimps.) 1857 Maera e., Stimpson in: P. Calif. Ae., v.1 p.99 | 1857 Gammarus confervicolus, Stimpson in: Boston J. nat. Hist., ©.6 p.520 | 1862 @. e., Bate, Cat. Amphip. Brit. Mus., p.218 t.38 f.9 | 1899 Melita e., TV. Stebbing in: Tr. Linn, Soe. London, ser.2 v.7:p.425 | 1898 Gammarus marinus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 762. L. 12-5 mm. ’ North-Paecifie (San Franeisco, among confervae in salt marshes; Pugets Sound). M. gayi (Nie.) 1849 Amphitoe g., H. Nicolet in: Gay, Hist. Chile, v.3 p.236, Crust. t.2 f.6a,b | 1893 Amphithoe g., A. Della Valle in: F. Fl. Neapel, v.20 p.463 | 1899 Melita g., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v©.7 p. 425. Side-plate 5 much shorter than 4th, 6th deeply emarginate so that the anterior lobe takes the form of a horn much eurved backward (eompare M.palmata 9, p. 425). L. about 9 mm. South Paeifie (off Chili). en . 3 2 i F; 4 i Melita, Paraceradocus 429 M. inaequistylis (Dana) 1852 Amphitoe (Melita) i.(2) + 4A. (M.) tenuicornis part.: 8), J. D. Dana in: P. Amer. Ac., v.2 p.214; p.215 | 1853 & 55 M.t., J.D. Dana in: U. S. expl. Exp., e. 1311 p. 963 t.66 f.5a—m | 1881 M. t., G. M. Thomson in: Tr. N. ‚Zealand Inst., «.13 p.218 | 1862 Moera t., Bate, Cat. Amphip. Brit. Mus., p:195 t.35 f.6 | 1875 Paramoera t., Miers in: Ann. nat. Hist., ser.4 v.16 p.75 | 1876. P. t., Miers, Cat. Crust. N. Zealand, p.127 t.3 £.8 (2) | 1893 Melita palmata (part.).. A. Della Valle in: F. Fl. Neapel, v.20 p. 714. Dana’s and Thomson’s statements are in many respeets contradietory; whether 2 and 8 belong to the same species, is doubtful. # South-Paeifie (New Zealand). Between tidemarks and in rock pools along eoast. M. oxyura Catta 1875 M. o., Catta in: Rev. Sei. nat., .4 p.164 ! 1893 M. o., A. Della Valle in: F. Fl. Neapel, v.20 p. 716. Rather near to M. gladiosa; specially distinguished by the RER dentation of the lower hind margin of pleon segments. Gulf of Lyon (Marseille). Among Zostera, depth 19—25 m. M. sp., F. Brandt 1851 Gammarus longicauda (non A. Costa 1851!), F. Brandt in: Middendorff, Reise Sibirien, v.21 p.141 t.6 f.32 | 1862 Megamoera l., Bate, Cat. Amphip. Brit. Mus., p.229 t.40 f£.3 | 18938 Maera? l., A. Della Valle in: F. Fi. Neapel, v.20 p.730 | 1876 Melita dentata (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.392 | 1894 M.d. (part.), G. O. Sars, Crust. Norway, v.1 p.514. Perhaps identical with M. dentata (p. 427). Sea of Ochotsk. M.sp., Stimps. ?1852 Amphithoe tenwicornis (part.) (err., non Amphithoe t. Rathke 1843)), J. D. Dana in: P. Amer. Ac., ©.2 p.214 | 1855 Gammarus t. (sp. nov.!), Stimpson in: P. Ac. Philad.. v.7 p.382 | 1899 Melita t., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.425. L. 8 mm. North-Paeifie (Loo Choo Islands). 31. Gen. Paraceradocus Stebb. 1899 Paraceradocus (Sp. typ.: P. miersii), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.426. Side-plates not deep, 1° larger than 4". Antenna 1 longer than antenna 2, but not stouter and with shorter peduncle. Upper lip transversely elliptie. Lower lip with prineipal lobes dehiscent. Mandibular palp long, 34 joint not short. Maxilla 1, inner plate large, with setae only on the apex, palp broad. Maxilla 2, inner plate fringed on inner margin. Peraeopod 1, uropods and telson as in Ceradocus (p. 430). 1 species. pr 1. P. miersii (Pieff.) 1888 Megamoera m., Pfeffer in: Jahrb. Hamburg. Anst., 0.5 p.121 t.3 f.3 | 1893 Maera? m., A. Della Valle in: F. Fl. Neapel, v.20 p. 732 | 1899 Paraceradocus m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 426. Body elongate, back rounded as far as peraeon segment 6, segment 7 and pleon segments 1—5 with dorsal angle, on segments 4—5 raised into a carina produced acutely backward, pleon segment 6 dorsally flat. Head, lateral lobes a little Dee, narrowly rounded, post-antennal corners not acute. Side-plates 1 and 2 rather shallow, larger than 34 and 4th, 4th not deeper than 5t%,. Pleon segment 3, postero-lateral corners strongly En fr ae 9 Mac een Se BER TE RENTE 430 Paraceradocus, Ceradocus produced backward, acute, with slight upward curve. - Eyes narrowly oval. Antenna 1 about half as long as body, 1° joint long and stout, 24 thinner and rather shorter, 39 small, flagellum rather longer than peduncle, 50-jointed, accessory flagellum about 7-jointed. Antenna 2 very strong, gland-cone short, antepenultimate joint of peduncle very stout, penultimate and ultimate joints of peduncle corresponding in thickness and length respectively to 1% and 24 joints of antenna 1, flagellum stout, as long as ultimate joint of peduncle, about 17-jointed. Gmathopod 1, 5! joint rather longer than 6th, 6th oblong, a little widened distally, palm nearly transverse. Gnathopod 2 much larger, 5% joint broad, cup-shaped, 6!" large, subquadrate, a little widened distally, palm transverse, sinuous, defined by a short strong tooth, not quite reached by the finger-point. Peraeopods 1 and 2 not very strong. Peraeopods 3 —5 successively longer, robust, spinose, 24 joint well expanded, but narrowing somewhat downward. Uropods 1—3 stout, in 1° and 24 outer ramus rather shorter than inner, 1° not reaching so far back as 24, 24 Jittle beyond pedunele of uropod 3. Uropod 3, peduncle short, rami forming long narrow laminae, in 0 of quite exceptional size, slightly widening to rounded apices, in Q narrowly elliptic, inner ramus in q scarcely, in Q con- siderably longer and somewhat broader than the outer. Telson cleft nearly to base, breadth at base equal to °/, of length, lobes conical, divergent. Colour orange-red. L. © 35—38, 5 46 mm. South-Atlantie (South Georgia). Low-tide. 32. Gen. Ceradocus A. Costa 1853 Ceradocus (Sp. un.: ©. orchestiipes), A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.170 | 1893 C. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.718 | 1862 Mega- moera (part.), Bate (& Westwood), Brit. sess. Crust., v.1 p.400 | 1862 Megamaera, Bate, Cat. Amphip. Brit. Mus., t. 39. Head without conspieuous rostrum. Side-plates shallow, 4! not deeper than 5t%, nor excavate behind. Antenna 1 the longer and stouter, accessory flagellum well developed. Antenna 2, flagellum short. Upper lip with rounded margin. Lower lip with inner lobes. Mandible, 3% joint of palp straight, much shorter than 24. Maxilla 1, ipner plate large, subacute above, margin fringed with numerous setae, outer plate with 9 or more spines. Maxilla 2, inner plate fringed along inner margin. Maxillipeds, gnathopods 1 and 2, peraeopods 1—5, uropods 1 and 2 and telson as in Maera (p. 433); uropod 3 with rami greatly developed. 4 species. Synopsis of species: 1 Some segments dorsally dentate . ...... 1. ©. rubromaculatus . p. 450 No segments dorsally dentate — 2. Side-plates 1—4 with tooth at lower hind eorner 2. C. semiserratus ....p.431 2 2 Side-plates 1—4 without tooth at lower hind corner — 8. Pleon segment 3, postero-lateral corners denti- Dinbe ve e e , 3. C. orchestiipes. . . p. 432 Pleon segment 3, postero-lateral corners forming a simple N ES N AR 4.0. t0relHr 2.30 4: 9; 488 3 1. C. rubromaculatus (Stimps.) 1855 Gammarus rubro-maculatus, Stimpson in: P. Ac. Philad., v.7 p.394 | 1885 Moera rubromaculata, Haswell in: P. Linn. Soc. N.S. Wales, e.10 p.105 t.15 f.5—12 | 1888 Maera r., T. Stebbing in:. Rep. Voy. wi 2 nr ’ ’ 3 Ed ar N a a a Fr 1 f d 1 2 | $ A PO AT) ad man al Frage u De ame s Y r +” D e , a a a “ 6 Ceradocus 431 Challenger, v.29 p.1008 t. 95, 96 | 1893 Ceradocus rubromaculatus, A. Della-Valle in: F. Fl. Neapel, v.20 p.720 | 1899 C.r., T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.426 | 1862 Megamoera serrata, Bate, Cat. Amphip. Brit. Mus., p.226 t.39 f.5| 1879 Melita? ramsayi + Moera rubro-maculata + M. spinosa + M. ramsayi, Haswell in: P. Linn. Soe. N.S. Wales, v.4 p.246 t.10 £.1; p.267 t.10 £.4; p.268 t.10 £.5; p- 334 | 1885 Moera festiva, Chilton in: P. Linn. Soc. N. S. Wales, v.9 p.1037 t.46 f.2. Pleon segments 1—6 dorsally serrate, with setules in the serrations, segment 1 with 15 teeth, 24 with 17, 34 with 15, 4!" with 9, 5t" with 7, 6th with 3, - central most prominent, especially in segments 3 and 4, but this ornamentation is very variable. Head, lateral lobes nasiform, post-antennal corners acute. Side-plates 1—4 shallow, not deeper than 5%, 1° a little outdrawn, acute, 24 —4th subquadrate: with rounded angles.. Pleon segments 1—3, . postero-lateral corners acute, in segments 1 and 2 and sometimes in 3 lower margin a little serrate, and in segment 3 hind margin of the cormer serrate. Eyes dark, oval, elose to margin of lateral lobes of head. Antenna 1 half as long as body, 24 joint more slender than 1%, but as long or a little longer, 34 about !/), as long as 24, flagellum shorter than peduncle, 10— 33-jointed, accessory flagellum also variable, 4+—12-jointed. Antenna 2, gland-cone nearly reaching end of long antepenultimate joint of peduncle, this and ultimate joint much shorter than penultimate, flagellum short, with 18 joints (to match 33 in flagellum of antenna 1). Upper lip with almost semicircular margin. Lower lip, prineipal lobes dehiscent, with little quadrate corner at top of inner margin. Mandible, 34 joint of palp much shorter than 24, with long apical spines. Gnathopod 1, 5ttjoint longer than 6%, both spinose, 6!" rather broadly ovate, palm oblique, slightly convex, finely dentieulate, finger fitting palm. Gnathopod 2 in d, 5tk joint short, cup-shaped, much narrower than the massive 6*, which is distally widened, hind margin nearly straight, front very convex, palm defined by a strong tooth between palmar spines, very oblique, with 1 or 2 gaps, or with variable denticulation; finger strong, much or little curved. Peraeopods 1 and 2 slender, 1° rather longer than 24. Peraeopods 3—5 rather stout, 3X much shorter than the following, 4% rather longer than 5th, 22 joint narrowly oblong in peraeopod 3, broader in the others. Uropods 1 and 2 not or scarcely reaching beyond peduncle of uropod 3. Uropod 3, rami subequal, broad and long, strongly serrate and spined on both margins, apices narrow, not acute. Telson short, broader than long, cleft nearly to ‚base, almost the full width between the acute apices, inner margins of the lobes sinuous. Colour, spotted with erimson above, white below. L. reaching 23 mm. Australian and Tasmanian waters, and off Cape Agulhas. Depth 9—282 m, and in sea-weed on sandy beach. 2. C. semiserratus (Bate) 1862 Megamoera semiserrata, Bate (& Westwood), Brit. sess. Crust., v.1 p. 401 f. | 1862 M. s., Megamaera semmisefrata, Bate, Cat. Amphip. Brit. Mus., p.226; t.39 £.6 | 1869 Maera semiserrata, (A. M. Norman in:) G. S. Brady & D. Robertson in: Ann. nat. Hist., ser. 4 vo. 3 p. 359 | 1889 M. s., A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.127 | 1899 Ceradocus semiserratus, T. Stebbing in: Tr. Linn. Soc. Jaondon, ser.2 v.7 p.426 | 1893 C©. fasciatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 721. Body slender, smooth. Side-plates 1—4 each with a tooth at the lower hind corner. Pleon segment 3, postero-lateral corners rather produced, smooth below, but with the hind margin regularly serrate. Eyes narrowly reniform. Antenna 1 about half as long as body, 24 joint rather longer than 1°, 34 less than half as long as 1%, flagellum rather longer than peduncle Y 432 Ceradocus Antenna 2 reaching little beyond peduncle of antenna 1. Gmnathopods 1 and 2 somewbat similar in shape, but 1° (in figure) has 5t" joint longer than oblong oval 6%, both very hirsute; in the considerably larger gnathopod 2 the 5b joint is rather shorter than the 6'%, which has the palm oblique, slightly denticulated, defined by short palmar spines. Peraeopods 1 and 2 very slender. Peraeopods 3—5 successively longer, 24 joint not greatly expanded, serrate behind. Uropod 3 reaching far beyond the others, rami equal. Telson cleft, each lobe obliquely truneate. L. 6—7 mm. North-Atlantie (British Isles, West of France). 3. C. orchestiipes A. Costa 1844 Gammarus fasciatus (non Say 18181) + Var. @. f. corallinus (nom. nud.)—+Var. @. f. violaceus (nom. nud.), ©. G. Costa in: Atti Acc. Borbon., e.5ı p.73 t.1 f.8 | 1893 Ceradocus f. (part.), A. Della Valle in: F. Fl. Neapel, ©.20 p.721 t.6 £.1; t.21 £.17—33 | 1853 (©. orchestüipes, A. Costa in: Rend. Soc. Borbon., n. ser. v©.2 p.177 | 1899 €. o., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v©.7 p. 426 | 1866 Maera o., Cam. Heller in: Denk. Ak. Wien, 0.2611 p.38 t.3 f.22,23 | 1862 Melita orchestipes, Bate, Cat. Amphip. Brit. Mus., p. 187 ! 1864 Megamoera o., E. Grube, Lussin, p. 73. Body dorsally smooth, rounded, but pleon segments 1—6 (variably: all to none) medio-dorsally produced into a tooth. Head without rostrum, laterai lobes narrowly produced. Side-plates 1—4 shallow, subquadrate, 1°* produced forward in an acute recurved point. Pleon segment 3, postero- lateral corners acutely outdrawn, with irregular and variable denticulation. Eyes small, oval, black (Heller), eireular, yellow-brown (Della Valle). Antennal about half as long as body, 24 joint thinner than 1°, as long or longer, 34 short, flagellum sometimes longer than peduncle, 40-jointed, accessory flagellum 7—10- jointed. Antenna 2 much shorter, gland-cone as long as the unusually long antepenultimate joint of pedunele, ultimate shorter than penultimate, flagellum longer than ultimate joint of peduncle and sometimes more than 20-jointed. Gnathopod 1, 24 joint eurved, 5 as broad as 6th and rather longer, 6t" oval, hind margin more convex than front, palm ill-defined, finger stout. Gnathopod 2 much larger, especially in J, 5t" joint small, 6% widening to the very oblique palm, which is defined by a strong tooth, and is regularly denticulate in ©, irregularly in C. In J the hands of gnathopod 2 often unlike in size and shape. Peraeopods 1 and 2 slender. Peraeopods 3—5 successively longer, moderately robust, 24 joint oblong, not greatly expanded, hind margin smooth, distally produced into a small acuminate process. Uropods 1 and 2 reaching equally far back. Uropod 3 reaching much beyond the others, rami very long, equal, laminar, fringed with spinules, apices narrowly truneate. Telson cleft nearly to base, lobes dehiscent, with 2 spines between acute outer apex and inner angle. Colour, banded pale yellow and crimson, appendages variegated with the same hues. L. 15 mm. Mediterranean. Depth 17—-70 m. 4. C. torelli (Gods) 1866 Gammarus t., Goes in: Öfv. Ak. Förh., ©.22 p. 530 t.40 f,28 | 1867 Megamoera t., Bate in: Zool. Ree., ©.3 p.232 | 1871 Maera t., A. Boeck in: Forh. Selsk. Christian., 1870 p.208 | 1876 M.t., A. Boeck, Skand. Arkt. Amphip., v.2 p.380 | 1893 Ceradocus t., A. Della Valle in: F. Fl. Neapel, v.20 p. 723 | 1899 C.t., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 426. Body elongate, smooth, not very compressed. Head, lateral lobes rounded, little prominent. Side-plates 1, 2 and 5 larger than 34 or 4, none very deep. Pleon segments 1—3, postero-lateral corners forming a pöinted hook. Eyes unknown. Antenna 1 about half as long as body, B gi Br: al Ta TE Ceradocus, Maera : 433 peduncle very long, 24 joint longer than 1°, 34 scarcely '/, aslong as 24, flagellum shorter than peduncle, with 35 short joints, accessory flagellum 5-jointed. Antenna 2 much shorter, slender, gland-cone long, ultimate joint of pedunele shorter than penultimate, flagellum subequal to ultimate joint of peduncle, 16-jointed. Gnathopod 1, 5% joint rather smaller than 6%, both hirsute. Gnathopod 2 much larger, 5t" joint short, cup-shaped, 6tb very large, oblong, widening a little to the oblique, well defined palm, which is much shorter than the hind margin, finger serrate within. Peraeopods 1 and 2 small. Peraeopods 3—5 rather robust, peraeopod 3 very short, 5" long; 24 joint not greatly expanded, hind margin serrate, forming below an acute corner. Uropods 1—3 as in C. orchestipes. Telson deeply eleft, lobes divergent, with spinules on outer margin and in the emarginate apices. L. over 50 mm. Aretie Ocean (Iceland). 33. Gen. Maera Leach 1813/14 Maera (Sp. un.: M. grossimana), Leach in: Edinb. Ene., v.7 p. 403, 432 1893 M., A. Della Valle in: F. Fl. Neapel, v.20 p.724 | 1894 M., G.O. Sars, Crust. Norway, v.1 p.517 | 1843 Moera, L. Agassiz, Nomenel. zool., Crust. p.18 | 1853 Leptothoe (Sp. un.: L. danae), Stimpson in: Smithson. Contr., v.6 nr.5 p.46 | 1862 Megamoera (part.), Bate (& Westwood), Brit. sess. Crust., v.1 p. 400. Body more or less slender. Head without conspicuous rostrum. Side- plates shallow, 4 scarcely or not emarginate behind. Antenna 1 the longer, 24 joint usually longer than 1°, accessory flagellum well developed. Antenna 2, flagellum short. Upper lip symmetric. Lower lip with inner lobes. Mandible with slender palp, 3@ joint straight. Maxilla 1, inner plate with few setae, outer with (probably) 10 spines. Maxilla 2, inner plate not fringed with setae on inner margin. Maxillipeds normal, but the 3 spine-teeth on apex of inner plate are not certainly present. Gmnathopods 1 and 2 subchelate, gnatho- pod 2 usually much the larger in the d. Peraeopods slender, peraeopods 4 ' and 5 longer than the rest, 24 joint of peraeopods 3—5 variable, sometimes very slender. Uropod 3 often reaching much beyond the others, rami equal or not very unequal, 1-jointed. Telson rather small, deeply cleft. 12 accepted and 8 doubtful species. Synopsis of accepted species: Uropod 3 scarcely or not at all extending 1 | beyond uropod 1 — 2. Uropod 3 extending much beyond uropod 1— 5. 9 SE RN rar wer a EEE 1. M.tenera .... . p. 434 With eyes — 8. 3 Uropod 3, rami not apically obtuse. . . . . 2. M. quadrimana . . p.434 Uropod 3, rami apically obtuse — 4. Peraeopods 4 and 5, 2d joint not produced 4 N ET RITTER ERBE? 3. M. grossimana . . p.435 Peraeopods4and5, 2d joint produceddownward 4. M.inaequipes . . . p.485 5 Some segments dorsally dentate — 6. No segments dorsally dentate — 7. 6 Pleon segment 1 without dorsal teeth. ... 5. M.tenuimana . . . p.436 Pleon segment 1 with dorsal teeth ... . - 6. M. westwoodi . . . p. 486 y { MR RO ER en ie 7. M. fureicornis . . . p.437 Body not pubescent — 8. Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 28 434 Maera 8 Body extremely slender — ®. Body not extremely slender — 11. 9 Gnathopod 2, palm excavate near definingangle 8. M.hamigera. . . . p.487 Gnathopod 2, palm not excavate — 10. 10 Peraeopod 5 shorter than peraeopod 4 .. . 9. M.tenella. ... . p. 438 Peraeopod 5 not sherter than peraeopod 4 . 10. M.loveni ..... p. 438 Pleon segment 3, postero-lateral corners serrate 1 above and below, acutely produced . . . 11. M.othonis. ... . p- 438 Pleon segment 3, postero-lateral corners serrate only above, quadrate . . . . 2.2. 22... 12. M. mastersi. . . . p.489 1. M. tenera 0. Sars 1876 Moera tenella, Maera t. (non Gammarus tenellus J. D. Dana 1852|), G. O. Sars in: Arch. Naturv. Kristian., v.2 p. 259, 271 | 1885 Maera tenera,' G.O.Sars in: Norske Nordhavs-Exp., 0.6 Crust. I p.177 t.14 f.7 | 1893 M. t., A. Della Valle in: F. Fl. Neapel, v.20 p. 724. Body very slender, almost cylindrie, smooth. Head, lateral lobes -rounded, little prominent. Side-plates very shallow, 1° the deepest, rounded in front, produced a little forward. Pleon segment 3, postero-lateral corners . quadrate. Eyes entirely wanting. Antenna 1 elongate, 1% and 24 joints subequal, 34 about !/, as long as 24, flagellum shorter than pedunele, 16-jointed, accessory flagellum 4-jointed. Antenna 2 of ”/, length of antenna 1, ultimate joint of peduncle shorter than penultimate, flagellum shorter than peduncle, 8-jointed. Gmathopod 1 small, 6! joint not larger than 5th. Gnathopod 2 powerful, 5tk joint (in figure) broad and rather longer-than broad, 6!" very large, almost quadrate, twice as large as 5th, setose, finger not very large. Peraeopods 1—5 very slender, with scanty armature, 3d—5tk with linear 24 joint, peraeopods 4 and 5 elongate. Uropods 1—3, rami slender, lanceolate. Uropod 3 reaching little beyond the others. Telson very small, deeply ineised. L. 10 mm. North-Atlantie (Storeggen [Norway]). Cold area, depth 785 m. 2. M. quadrimana (Dana) 1853 & 55 Gammarus quadrimanus, J. D. Dana in: U.S. expl. Exp., v.13ır p. 955 t.65 f.9 | 1862 Moera q., Bate, Cat. Amphip. Brit. Mus., p. 194 t.35 £.5 | ?1882 M.q., G. M. Thomson in: Tr. N. Zealand Inst., v. 14 p. 235 t.17 £.4a, 4b | 1893 Maera truncatipes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.725. Body slender, smooth. Side-plates 1—4 shallow, subquadrate. Pleon segment 3, postero-lateral corners said to be dentate (Della Valle). Eyes (in figure) small, rounded. Antenna 1, 1% and 22 joints long, subequal, 34 very short, flagellum rather ‚shorter than peduncle, accessory flagellum rather longer than half the primary. Antenna 2, peduncle shorter than in antenna 1, flagellum very short. Gnathopod 1 small, 6! joint oblong, both 5tk and 6tk widened distally,. Gnathopod 2, 5tk joint small, cup-shaped, 6tk very large, widened to the palm, which forms a somewhat obtuse angle with the hind margin, is divided into 3 blunt teeth, and defined by a long, acute tooth, separated from the others by a cavity (Thomson: front margin longer than the hind margin; 2 small teeth in place of the long defining tooth). Peraeo- pods 1 and 2 very slender. Peraeopods 3—5, 24 joint moderately expanded and produced downward, 4th joint rather broad, produced, finger sharply produced behind the short nail. Peraeopod 5 a little shorter or longer than peraeopod 4. Uropods 1—3 (in figure) reaching about equally far back. Uropod 3, rami straight, equal, in figure subacute, tipped with slender setae. Uropod 2 Maera 435 with very long rami (Della Valle), Telson undeseribed. Colour uniform vellowish white or dirty green. L, 12—16 mm. Tropical and South-Paeifie (Fiji Islands, eoral reefs; Paterson Inlet [New Zealand]). 3. M. grossimana (Mont.) 1808 Cancer (Gammarus) grossimanus, Montagu in: Tr. Linn. Soe. London, @9 p.97 t.4 f.5 | 1812 Astacus g., Pennant, Brit. Zool., ed.5 v.4 p.33 | 1813/14 Maera grossimana, Leach in: Edinb. Ene., v.7 p.403. 432 | 1889 M. g., A. M. Norman in: Ann. nat. Hist., ser. 6 v.4 p.126 | 1893 M. g. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.727 t.2 £.10; t.21 f.1—16; t.41 £.37 | 1818 Gammarus grossimanus, Lamarck, Hist. An.s. Vert., ».5 p.182 | 1862 Moera g., Bate, Cat. Amphip. Brit. Mus., p.188 t.34 f.3 | 1888 M. grossimana, T. Barrois, Cat. Crust. Acores, p.38 f. | 1830 Gammarus impostii, H. Milne Edwards in: Ann. Sei. nat., v.20 p.368 | 1866 Maera donatoi, Cam. Heller in: Denk. Ak. Wien, 0.2611 p.41 t.3 f. 26. Body slender, smooth. Head, rostrum minute. Side-plate 1 acutely pro- duced forward, 24—4th quadrate. Pleon- segment 3, postero-lateral corners acutely produced, not serrate. Eyes narrow, sometimes reniform, reddish brown. Antenna 1, peduncle elongate, 24 joint longer, sometimes much longer than 1°, flagellum shorter than peduncle, 22-jointed, accessory flagellum 8-jointed. Antenna 2 much shorter, gland-cone long, but not reaching end of antepenultimate joint of peduncle, penultimate slightly curved, longer than ultimate, flagellum short, 8- or 9-jointed. Mandibular palp slender, 1% joint slightly produced, 34 joint straight, shorter than 24. Maxilla 1, inner. plate with 3 setae at apex. Maxillipeds, inner plates with a spine tooth subapical on inner margin, others perhaps on apex, 4% joint of palp with spine-like nail. Gnathopod 1 slender, 5tk joint rather longer than 6tk, front margin distally acute, 6t" joint widened a little to the oblique convex palm. Gnatho- pod 2, 4% joint with acute hind margin, 5t% short, cup-shaped, 6th large, longer than broad, palm defined by a tooth, with its margin irregularly notched in J, regularly serrate or crenulate and convex in ©, finger match- ing palm, large, curved, outer margin fringed with setules. Peraeopods 1 and 2 slender. Peraeopods 3—5, 24 joint little expanded, narrowing down- ward, slightly produced in peraeopod 3, but forming no free hind corner in peraeopods 4 and 5, finger with a short sharp nail on its blunt apex. Uropod 3 not or not conspicuously reaching beyond uropod 1, the rami equal, rather longer than peduncle, apices squarely truncate, tipped with setae. Telson shorter than pedunele of uropod 3, cleft about */, of length, lobes very divergent, each having a tridentate apex, middle tooth longest, outer minute, with intervening spinules. Colour transparent yellowish, with rosy tinting. L. 6—9 mm. North-Atlantie with English Channel (Devon, Cornwall, Channel Islands; Azores; West France); Mediterranean. 4. M. inaequipes (A. Costa) 1847 Amphithoe truncatipes (nom. nud.), (Spinola in MS.) A. White, Crust. Brit. Mus., p. 87 | 1893 Maera t. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 725 t.1 f.2; t.22 f.26—-40 | 1851 Amphithoe inaequipes, (A. Costa in:) F. W. Hope, Cat. Crost. Ital., p.45 | 1857 Gammarus scissimanus, A. Costa in: Mem. Acc. Napoli, v.1 p.221 t.3 f.7 | 1866 Maera seissimana + M. integrimana, Cam. Heller in: Denk. Ak. Wien, 0.2611 p.40 t.3 f.24; p.40 t.3 f.25 | 1888 Moera s., F. Barrois in: Bull. Soc. zool. France, v.13 p.58 | 1888 M. s., F, Barrois, Cat. Crust. Acores, p-35 textf. | 1862 M. truncatipes + M. blanchardi, Bate, Cat. Amphip. Brit. Mus., p.189 t.34 f.4; p.190 t. 34 £.5. , Body rather robust, smooth. Head, lateral lobes rounded. Side-plate 1, front corner a little produced, acute, 24 squarely rounded, small. Pleon 28* 436 Maera segment 3, postero-lateral corners not serrate. Eyes small, round, dark. Antennal slender, 24 joint longer than 1°, 34 rather short, flagellum rather shorter than peduncle, 15—26-jointed, accessory flagellum 7—11-jointed. Antenna 2 rather longer than peduncle of antenna 1, gland-cone reaching beyond ante- penultimate joint of peduncle, ultimate scarcely shorter than penultimate, flagellum subequal to ultimate, 5—10-jointed. Gnathopod 1, 5b joint as long as 6th, 6th subovate, wider than 5t" at junction of hind margin with convex, ill-defined palm. Gnathopod 2 much larger, 5" joint small, cup-shaped, 6th broad, a little longer than broad, palm almost transverse, defined by an acute tooth, margin in © convex, serrulate, in JS variable but usually with a deep central notch or cavity; finger powerful. Peraeopods 1—5 with tri- cuspidate finger, that is, having a nail projeeting between 2 points. Perae- pods 3—5, 24 joint moderately expanded, hind margin somewhat produced downward in a rounded lobe, peraeopods 4 and 5 equal. Uropods 1—3 reaching about equally far back. Uropod 3, rami not very long, apically obtuse, tipped with setae. Telson deeply cleft, each lobe bidentate, a spine between the short outer and long inner tooth. Colour, dorsally green bronzed with a little red, gnathopods 1 and 2 tinged with green, other appendages pellueid, pinkish. L. 7 mm. Mediterranean; North-Atlantie (Azores). 5. M. tenuimana (Bate) 1862 Gammarus tenwimanus (2), Bate (& Westwood), Brit. sess. Orust., v. 1 p. 384 f. | 1862 @. t., Bate, Cat. Amphip. Brit. Mus., p. 214 t.38 f.2 | 1895 @. t., A. O. Walker in: Ann. nat. Hist., ser.6 0.15 p.471 | 1868 Maera batei (3), A. M. Norman in: Ann. nat. Hist., ser. 4 v.2 p.416 t.22 f.1-3 | 1889 M.b., A. M. Norman in: Ann. nat. Hist., ser.6 ».4 p.127 | 1898 M.b., A. Della Valle in: F. Fl. Neapel, 0.20 p.726 | 1895 Moera b., A. O. Walker in: P. Liverp. biol. Soe., v.9 p.808 |! 1868 Megamoera multidentata, (A. M. Norman in MS.) Bate & Westwood, Brit. sess. Crust., v.2 p.515 f. Pleon segments 2—6 dorsally dentate, 24 with 3, 34 with 5, 4th—6th each with 2 teeth, a spinule at inner side of base of each tooth. Head, lateral lobes somewhat produced, rounded. Side-plates 1—4 shallow, 24 seemingly. somewhat large in d. Pleon segments 2 and 3, postero-lateral corners acute, not serrate. Eyes ovate, dark. Antenna 1, 24 joint considerably longer than 1%, 34 short, flagellum about as long as peduncle, 22—24-jointed, accessory flagellum 4- or 5-jointed. Antenna 2 subequalto peduncle of antenna l, ultimate and penultimate joints of peduncle subequal, flagellum not longer than ultimate, 8-jointed. Gmathopod 1 slender, 5" and 6" joints parallel- sided, 6tk the shorter, palm slightly oblique, short. Gnathopod 2 in Q very like gnathopod 1, but 6" joint ovate, palm undefined, finger small; in J, 5th joint small, cup-shaped, 6tk large, subreetangular, palm ?/, its length, with 3 tubercles, the one which defines the palm being flat-topped and setose, finger strongly eurved, leaving a gap when closed. Peraeopods 1 and 2 slender. Peraeopods 3—5, 24 joint not much expanded, in peraeopods 4 and 5 not forming a free corner below, finger strong. Uropod 1 much longer than uropod 2, but scarcely reaching beyond peduncle of uropod 3. Uropod 3, peduncle long, very stout, rami subequal, very long, laminar, fringed with spines. Telson with 1 spine at apex of each lobe. L. 6--9 (15?) mm. English Channel (Guernsey); Menai Strait and Liverpool Bay, depth 19-—88 m; Moray Firth, at mouth of rivers. 6. M. westwoodi Stebb. 1855 Gammarus kroyeri (non H. Rathke 1843)), T. Bell in: Belcher, Last arct. Voy., v.2 p.405 t.34 f.4 | 1862 Megamoera kröyeri, Bate, Cat. Amphip. Brit. Mus., p.229 t.40 f.4 | 1898 Maera? k., A. Della Valle in: F. Fl. ae a Fr Bl n f X Maerä ; 437 Neapel, v.20 p.730 | 1871 Melita dentata (err., non Gammarus dentatus Kroyer 1842!), A. Boeck in: Forh. Selsk. Christian., 1870 p.211 | 1888 M.d., T. Stebbing in: Rep. Voy. Challenger, v.29 p.281, 1710 | 1899 Maera westwoodi, T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.426. Little removed from M. tenuimana, but: pleon segment 1 dorsally dentate, accessory flagellum of antenna 1 extremely small, antenna 2 with - peduncle as long as pedunele of antenna 1, and gnathopod 2 (Bate) with 6th joint ovate, palm oblique, straight (sinuous in figure) L. 22 mm. Wellington Channel [aretic Canada]. Depth 66 m. 7. M. fureicornis (Dana) 1852 Gammarus f., J. D. Dana in: P. Amer. Ac., v.2 p.211 | 1853 & 55 @. f., J. D. Dana in: U.S. expl. Exp., v.13u p. 951 t.65 f.6 | 1862 Moera f., Bate. Cat. Amphip. Brit. Mus., p.193 t.35 £.2 | 1888 Maera f., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.1709 | 1893 M.? f., A. Della Valle in: F. Fl. Neapel, v.20 p. 730. Body rather slender, sparsely pubescent. Head, lateral lobes not prominent. Pleon segments 2 and 3, postero-lateral corners (in figure) not produced nor acute. Eyes (in figure) small, round. Antenna 1, 1° joint stout, 24 slender, a little longer, flagellum rather longer than peduncle, about 14-jointed, accessory flagellum about half primary, 5-jointed. Antenna 2 much shorter, but with pedunele nearly equal to that of antenna 1, its ultimate joint rather shorter than penultimate, flagellum subequal to penultimate, 7—10-jointed. Gnathopod 1 small, St" and 6*" joints subequal, 6" joint subovate. Gnathopod 2, 5th joint short, eup-shaped, 6 broad, oblong, a little widening to the truncate, or very slightly oblique, and not exeavate palm; finger half as long as 6!% joint. Peraeopods 3—5 rather long, 5t" the longest, 24 "oint in all narrow oblong, hind margin serrulate. Uropods 1 and 2 reaching about equally far, uropod 3 much farther, elongate. L. 6 mm. Sooloo Sea (shores of island off harbour of Soung). 8. M. hamigera (Hasw.) 1879 Moera h., Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.333 t.21 f.1 | 1888 Maera h., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1709 | 1893 M.h., A. Della Valle in: F. Fl. Neapel, v.20 p.723 | 1885 Megamoera suensis var., Haswell in: P. Linn. Soe. N.S. Wales, v.10 p. 103 t.15 £. 1—4. Body slender, smooth.. Head, lateral lobes not produced. Side-plates 1—4 not deep, gi the largest. Pleon segment 3, postero-lateral corners apparently quadrate with a few teeth(?) on their posterior margin. Eyes long, narrow. Antenna 1 elongate, 24 joint longer than 1°; flagellum about as long as pedunele, 33-jointed; accessory flagellum 4— 6-jointed. Antenna 2 about as long as peduncle of antenna 1, ultimate joint of peduncle shorter than penultimate, flagellum 13-jointed. Gnathopod 1 small, 6% joint ovate, palm not defined. Gmathopod 2, 5t" joint short, cup-shaped, 6!" more than twice as long as broad, widening a little to the pälm, which is little oblique, defined by an acute tooth separated by a cavity from 2 or 3 strong tubercles; finger strongly curved, short and thick; left gnathopod 2 smaller than right; larger hand with an acute tooth and 4 or 5 denticles, the smaller without denticles. Peraeopods 1 and 2 short, slender. Peraeopod 3 longer, not very stout. Peraeopods 4 and 5 long and stout. Peraeopods 3—5, 24 joint not much expanded. Uropods 1 and 2 reaching equally far, not to end of pedunele of uropod 3. Uropod 3 very large, peduncle long, rami more than twice as long as peduncle, ovate-lanceolate, with serrate margins. Halves of telson Jong and narrow, with a deep terminal notch. L. 12:5 mm. Port Jackson and Port Stephens [East-Australia]. 438 Maera 9. M. tenella (Dana) 1852 Gammarus tenellus, J. D. Dana in: P. Amer. Aec., v.2 p.212 | 1858 & 55 @. t., J. D. Dana in: U. S. expl. Exp., v.13u p.952 t.65 f.7 | 1862 Moera tenella, Bate, Cat. Amphip. Brit. Mus., p.193 t.35 f.3 | 1888 Maera t., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1710 | 1893 M. grossimana (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 727. Body slender, smooth. Side-plates shallow. Pleon segment 3, postero- lateral corners seemingly a little produced but scarcely acute. Eyes small, round. Antenna 1, 1% joint not stout, 24 very long, flagellum little longer than peduncle, accessory flagellum half as long as primary, 7- or 8-jointed. Antenna 2 very slender, short, flagellum as long as ultimate joint of peduncle. Gnathopod 1 small, 6!» joint subovate. Gnathopod 2 stout, 5 joint small, narrow, cup-shaped, 6% broad, much longer than broad, widening a little distally; palm nearly straight truncate, not excavate, defined by a small acute tooth. Peraeopods 1 and 2 remarkably slender. Peraeopods 3—5, 24 joint narrowing downward; peraeopod 5 rather shorter than 4*k, finger acutely produced behind the nail. Uropod 3 quite long, extending much beyond uropod 2. Telson oblong, apical setae as long as the telson. L. 8 mm. Tropical Paeifie (coral reefs of Fiji Island Viti Levu). 10. M. loveni (Bruz.) 1859 Gammarus l., R. M. Bruzelius in: Svenska Ak. Handl., n.ser. &.8 nr.1 p.59 t.2 £.9 | 1862 Moera loveni, Bate, ('at. Amphip. Brit. Mus., p. 193 t.85 f.1 | 1868 Maera loveni, A. M. Norman in: Ann. nat. Hist., ser. 4 ©. 2 p-416 t.21 f.11, 12 | 1893 M. loveni, A. Della Valle in: F. Fl. Neapel, ©.20 p.729 | 1894 M. loveni, G. OÖ. Sars, Orust. Norway, v.1 p. 519 t.182 £.2. Body long, very slender, smooth. Head, lateral lobes narrowly rounded. Side-plates small, 1° the largest, produced forward in a linguiform lobe, 4 twice as broad as deep, scarcely larger than 5th. Pleon segment 3, postero- lateral corners almost quadrate, with a little acute point. Eyes small, round, inconspieuous in spirit. Antenna 1 long, slender, 1° joint long, 24 longer, flagellum shorter than peduncle, 17— 30-jointed, accessory flagellum 5—7-jointed. Antenna 2 about half as long as antenna 1, ultimate joint of peduncle shorter than penultimate, flagellum not longer than ultimate, 7—12-jointed. Mandible, 34 joint of palp shorter than 24. Maxilla 1, inner plate with 3 or 4 setae at apex. Gmathopod 1, 5tk and 6th joints subequal, setose on both margins, 6 subovate, widest at the convex, ill-defined palm, finger with setae on outer margin and eilia on the inner. Gnathopod 2 rather powerful, 5th joint triangular, 6" large, oblong quadrangular, widest at the serrate, nearly transverse palm, defined by a small tooth, finger armed as in gnathopod 1. Peraeopods 1 and 2 very slender. Peraeopods 3—5, 24 joint little expanded, narrowing downward; peraeopods 4 and 5 elongate. Uropod 3 elongate, reaching much beyond the others, outer ramus about 2"/, times as long as peduncle, inner nearly as long as outer. Telson rather shorter than peduncle of uropod 3, cleft nearly to base, lobes Gonical, rather divergent, with spine between the shorter inner and longer outer tooth. L. JS reaching 26 mm. Arctie Ocean, North-Atlantie, North-Sea, Skagerrak and Kattegat (Disco [West- Greenland], depth 301 m; Spitzbergen, depth 87 m; Sweden, Norway, Denmark, Scotland). 11. M. othonis (M.-E.) 1830 Gammarus o., H. Milne Edwards in: Ann. Sei. nat., ©.20 p. 868, 373 t.10 f.11—13 | 1889 Maera o., A.M. Norman in: Ann. nat. Hist., ser.6 v.4 p.125 | 1893 M. o., A. Della Valle ia: F. Fl. Neapel, v.20 p.729 t.60 £.8| 1894 M. o., G. O. Sars, Crust. Norway, o©.1 p.518 t.182 f.1 | 1895 M.o., A.O. Walker in: P. Liverp. biol. Soe., v.9 p.308 | 1847 Gammarus longimanus, W. Thompson in: Ann. nat. Hist., v.20 p.242 | 1857 @.1., Bate in: Ann. nat. Hist., ser.2 v.19 p.145| 1876 Megamoera longimana, A. Boeck, Skand. Arkt. Amphip., ©.2 p.382 | 1847 Gam- an Maera 439 marus elongatus, (H. Frey &) R. Leuekart, Wirbell. Th., p. 160 | 1859 @. laevis, R.M. Bruzelius in: Svenska Ak. Handl.. n.ser.v.3 nr.1 p.60 t.2 f.10 | 1862 Megamoera longimana + M. othonis, Bate & Westwood, Brit, sess. Crust., v.1 p.4083 f.; p.405 £. | 1896 Maera brooki, T. Seott in: P. phys. Soc. Edinb., v. 18 p.173 t.5 f. 1—6. Body moderately compressed, back smooth. Head, lateral lobes angularly produced. Side-plate 1 produced in front, obtusely acuminate, 24 deeper, 4th quadrate, smaller than 34. Pleon segment 3, postero-lateral corners acutely produced and serrate above and below. Eyes oval reniform, dark. Antenna 1 slender, more than ?/, length of body, 24 joint longer and narrower than 1°, 34 short, flagellum longer than peduncle, 24—48-jointed, accessory flagellum 6- or 7-jointed. Antenna 2 about half as .long, ultimate and penultimate joints of peduncle subequal, flagellum short, 12—24-jointed. . Upper lip, apical margin faintly coneave. Mandibular palp slender, 3% joint as long as or longer than 2%. Maxilla 1, inner plate narrow, with 3 setae at apex. Gnathopod 1 slender, setose, 6% joint about as long as 5tk, oblong oval, palm very oblique, ill-defined, finger small. Gnathopod 2 in © rather stronger than gnathopod 1, 5t" joint distally widened and quadrate, 6% rather longer, narrowly oblong, palm oblique, mot strongly defined. Gnathopod 2 in d much stronger, 5tt joint short, broadly eup-shaped, 6 elongate, oblong oval, palm minutely serrate and imperfectly defined or non-existent; finger half as long as 6!" joint or longer than it. Peraeopods 1 and 2 slender and short. Peraeopods 3—5, 24 joint well expanded, oval, forming a free hind corner, hind margin serrate. Uropod 3 reaching much beyond the others, rami narrowly lanceolate, subequal. Telson rather longer than peduncle of uropod 3, lobes narrowly conical, acute, divergent, with spinule in notch a little way up inner margin. Colour whitish, blotched with rose. L. 11—35 mm. North-Atlantic, North-Sea and Skagerrak (Bohuslän; Norway; Heligoland; British Isles; West-France); Mediterranean (Marseilles). & 12. M. mastersii (Hasw.) 1879 Megamoera m., Haswell in: P. Linn. Soe. N.S. Wales, v.4 p.265 t.11 £.1 | 1899 Maera m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.426 | 1884 Megamoera thomsoni, Miers in: Rep. Voy. Alert, p.318 t.84 f.B| 1893 Ceradocus rubromaculatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 721. Body slender, back smooth. Head, lateral lobes rather narrowly produced. Side-plates I—4 rotundo-quadrate, not very deep but much deeper than the 3 following. Pleon segment 3, postero-lateral corners quadrate with their bind margin denticulate. Eyes narrowly reniform. Antenna 1, 24 joint of peduncle little longer than 1°, 34 short, flagellum as long or nearly as long as peduncle, accessory flagellum 4-jointed. Antenna 2, peduncle as long as that of antenna 1 or a little longer, flagellum subequal to ultimate joint of peduncle. Gnathopod 1, 5!" and 6th joints slender, equal; palm straight, smooth, oblique, hind margin strongly convex, with-4 small teeth. Gmatho- pod 2 much larger, 4 joint produced into a small acute tooth, 6th oval, palm oblique, irregularly denticulate, defined by a small tooth. Peraeopods 3—5, 24 joint well expanded, oval, with free corner, hind margin serrate, peraeo- pod 5 scarcely so long as 4%. Uropod 3 reaching much beyond the others, peduncle short and broad, rami equal, broadly lanceolate. Telson cleft to base, lobes bluntly conical, a little divergent, with 3 small teeth at the extremity and a notch armed with a single seta near the distal end of the inner border (Haswell), or with a row of spinules along the inner margin to the apex (Miers). Colour (in spirit) light yellowish brown. L. 11 mm. Port Jackson [East-Australia]; Torres Strait (Albany Island, Prince of Wales’ Channel and Thursday Island). Depth 7—17 m. 440 Maera M. albida (Dana) 1852 Gammarus albidus, J. D. Dana in: P. Amer. Ac., v.2 p-210 | 1853 & 55 @.a., J. D. Dana in: U.S. expl. Exp., v. 13m p.948 t.65 f.4 | 1862 Megamoera albida, Bate, ‘Cat. Amphip. Brit. Mus., p.231 t.40 f.7 (inaccurate copy) | 1893 Maera? a., A. Della Valle in: F. Fl. Neapel, v.20 p. 730. Uropods 1—3 all long; uropod 1 extends a little beyond the others, Tropical Paeifie (Samoan Island Tongatabu). In shallow waters of the lagoon, among sea weed. M.aspera (Dana) 1852 Gammarus asper, J. D. Dana in: P. Amer. Ac., v.2 p.209 | 1853 & 55 G.a., J. D. Dana in: U.S. expl. Exp., v. 1311 p. 945 t.65 f.2 | 1862 Megamoera aspera, Bate, Cat. Amphip. Brit. Mus., p.230 t.40 f.5 | 1893 Elasmopus? asper, A. Della Valle in: F. Fl. Neapel, 0.20 p.737 | 1899 Maera aspera, T. Stebbing in: Tr. - Linn, Soc. London, ser.2 v.7 p. 426. Pleon segments dorsally denticulate, denticulation irregular and not confined to the posterior margin. Mandibular palp small, slender, 1st joint short, 24 as long as 34, Peraeopods 3—5, 2d joint oblong, hind margin serrate. L. 12 mm. Sooloo Sea. Depth 12 m. M. danae (Stimps.) 1853 Leptothoe d., Stimpson in: Smithson. Contr., v.6 nr.5 p.46 t.3 f.32 | 1862 Moera d., Bate, Cat. Amphip. Brit. Mus., p. 190 t.34 f.6 | 1888 Maera d., T.. Stebbing in: Rep. Voy. Challenger, v.29 p.277 | 1898 M.d., A. Della Valle in: F. Fl. Neapel, v.20 p.731. Fundy Bay (Grand Manan). Laminarian zone, on sandy patches among weedy rocks. M. fusca (Bate) 1864 Moera f., Bate in: P. zool. Soc. London, p. 667 | 1888 Maera f., T. Stebbing in: Rep. Voy. Challenger, v. 29 p.345, 1709 | 1893 Mm. f., A. Della Valle in: F. Fl. Neapel, v.20 p. 731. North-Paeific (Esquimalt Harbour [Vancouver Island]). Depth. 19 m, from sponge. M.indica (Dana) 1853 & 55 Gammarus? indicus, J. D. Dana in: U, S. expl. Exp., v.13u p. 961 t. 66 f.4 | 1893 @. i., A. Della Valle in: F. Fl. Neapel, v.20 p. 454 | 1862 Megamoera indica, Bate, Cat. Amphip. Brit. Mus., p.232 t.40 f.9 | 1899 Maera i., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 426. Suggestive of a Sunamphitoe (p. 645); but see figure of uropod 3. L. 8 mm. Balabae Passage [North of Borneo]. Shores of a small coral island. M. kürgensis (Gerstf.) 1858 Gammarus k., Gerstfeldt in: M&m. pres. Ac. St.-Petersb., v.8 p.290 | 1888 @. k., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 309 | 1893 Amathilla? k., A. Della Valle in: F. Fl. Neapel, v.20 p.766. L.4-5mm. Arctic Ocean (pond on the Kürga [Siberia)). M. massavensis (Kossm.) 1880 Moera m., Kossmann, Reise Roth. Meer., v.2ı Malacost. p. 133 t.14 f. 9—11 | 1888 M. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.516 | 1893 Maera truncatipes (part.), A. Della Valle in: F. Fl. Neapel, v.20-p.725. Probably identical with M. tenella (p. 438). L. 4 mm. Red Sea. M. pubescens (Dana) 1852 Amphithoe p., J. D. Dana in: P. Amer. Ac., vu.2 p-214 | 1853 & 55 Gammarus? ps J. D. Dana in: U.S. expl. Exp., v. 131m p. 960 t. 66 f.3 | 1862 Gammarella p., Bate, Cat. Amphip. Brit. Mus., p. 181 t.38 f.1 | 1893 Elas- mopus? p., A. Della Valle in: F. Fl. Neapel, v.20 p. 737. Tropical Pacifie (Kingsmills). Coral reef. Ei ; r a a RB a RER 5% EU RT PET NEE VER CR in Elasmopus 441 34. Gen. Elasmopus A. Costa 1853 Elasmopus (Sp. un.: E. rapaz), A.Costa in: Rend. Soe. Borbon., n. ser. v.2 p. 170, 175 | 1871 E., A. Boeck in: Forh. Selsk. Christian., 1870 p.212 | 1888 E., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1018 | 1893 E., A. Della Valle in: F. Fl. Neapel, v.20 p.732 | 1894 E., G. O. Sars, Crust. Norway, v.1 p.520 | 1862 Megamoera (part.), Bate (& Westwood), Brit. sess. Crust., v.1 p. 400. Head with lateral lobes rounded. Side-plates I—4 usually well deve- loped and the 4! excavate behind and deeper than 5t%. Antenna 1 longer than antenna 2, 24 joint subequal to 1°, accessory flagellum seldom long. Antenna 2, flagellum short. Mouth-parts in general as in Maera (p.433), but 34 joint of mandibular palp usually falcate, and peetinate with spinules. Maxilla 1, outer plate sometimes with only 7 spines. Gnathopods 1 and 2 as in Maera. Peraeopods 3—5 robust. Uropod 3 reaching little or not at all beyond the others, rami broad, not long. Telson rather small, deeply cleft. 9 accepted and 4 doubtful species. Synopsis of accepted species: 1 One or more of the segments dorsally dentate — 2. None of the segments dorsally dentate — 4. Only one segment dorsally dentate ..... . 1. E. subcarinatus . p.441 Four segments dorsally dentate — 3. 3 f Gnathopod 2, palm very oblique.. ...... 2. E. diemenensis . p.442 \ Gnathopod 2, palm nearly transverse. . . . . - 3. E. suensis . . . . p.442 | Gnathopod 2, 6th joint fringed with very long setae 4. E. brasiliensis . . p. 443 4 X Gnathopod 2, 6th joint not fringed with very long T ek Gnathopod 2, 6th joint with eup-like hollow to 5 | zonBine Suser- Dom... ..4.5 u 2...» 5. E. pocillimanus . p.443 Gnathopod 2, 6th joint without cup-like hollow — 6. 6 Uropod 3, rami obtusely lanceolate . . ... . 6. E. delaplata . . . p.444 Uropod 3, rami truncate — 7. - { Antenna 1, accessory flagellum very short . .. 7. E,rapax.... . p.444 Antenna 1, accessory fagellum well developed — 8. 8 j Gnathopod 2, palm transverse. ........ 8. E.viridis . . . . p.445 \ Gmathopod 2, palm oblique. ..... 2... 9. E. boeckii . . . . p-445 1. E.subcarinatus (Hasw.) 1879 Megamoera sub-carinata, Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.335 t.21 f.4 | 1884 Moera s., Chilton in: N. Zealand J. Sei., v.2 p.230 | 1888 Elasmopus s., E. persetosus, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1019 t.98 | 1893 E. subcarinatus, A. Della Valle in: F. Fl. Neapel, 0.20 p. 733 | 1882 Moera petriei, &. M. Thomson in: Tr. N. Zealand Inst.v.14 p.236 t.18 f£.3 | 1883 M. p., Chilton in: Tr. N. Zealand Inst., v.15 p.82 t.2 f. 4a. Pleon segment 4 behind the dorsal depression bicarinate, the 2 apical teeth slightly inclined one toward the other. Head, lateral lobes broadly rounded, a small accessory lobe below the principal. Side-plate 1 somewhat produced forward, 4% the largest, much deeper than 5th, Pleon segment 3, postero-lateral corners acute, a little produced. Eyes large, reniform or oval, dark, advaneing on to lateral lobes of head. Antenna 1 elongate, 1° joint about as long as 24, much stouter, 34 not long nor yet very short, flagellum longer than peduncle, 50—60-jointed, accessory flagellum 6-jointed. Antenna 2 much shorter, ultimate joint of peduncle shorter than penultimate, flagellum shorter than peduncle, 14—17-jointed. Upper lip 442 Elasmopus faintly emarginate at apex. Lower lip with unusual distal narrowing of inner lobes. Mandible with slender palp, 3% joint longest, straight, (not falcate, as seems usual in the genus), and with few setae but no long row of spinules. Maxilla 1, inner plate with 3 setae on apex, outer with 7 spines. Maxilla 2, inner plate fringed on distal part of inner margin. Gnathopod 1 setose, 5!" joint a little shorter than 6%, 6th oblong, palm slightly oblique, convex, pectinate, well-defined, finger closing against small palmar spines on inner surface of the joint. Gnathopod 2 much larger in JS, 5% joint short, broad, cup-shaped, 6'% still broader, breadth */, of length, fringed behind with (Chilton: devoid of) very long setae, especially in C (as in E. brasiliensis), palm forming a broad spinulose process near.the finger-hinge, followed by a cavity, a strong tooth, a feeble oblique emargination and a defining dentiele; finger finely erenulate, strongly bent, with process touching the central palm-tooth, apex reaching the palmar denticle.e In Q gnathopod 2 has 5th joint rather longer than broad, 6!" scarcely broader than 5%, nearly twice as long as broad, palm oblique, not dentate, both joints very setose, finger slender, acute. Peraeopods 3—5, 24 joint rounded oblong, well expanded, especially in peraeopod 5, 4% joint large, 5th and 6th also stout, finger short. Uropods 1—3, rami a little unequal, with obtuse apices. Uropod 3, pedunele short, rami broad, laminar, inner slightly tbe shorter, with spines chiefly on inner margin, outer with spines chiefly on outer margin, each with spines on the truncate apex. Telson scarcely as long as pedunele of uropod 3, not quite as long as broad, lobes widely divergent, outer tooth of apex produced much beyond the inner, 2 unequal spines intervening. Colour whitish with brown dots, antennae banded with brown. L. about 14mm. South-Pacifie (Port Jackson, from low water to 66 m; Sydney Harbour; Botany Bay; Port Stephens; off Melbourne; Port Pegasus and Lyttelton Harbour [New Zealand], and at a depth of 2071 m). 2. E. diemenensis (Hasw.) 1879 Megamoera d., Haswell in: P. Linn. Soe. N.S. Wales, v.4 p.266 t.11 f.3 | 1893 Elasmopus rapax (part.)?, A. Della Valle in: F. FI. Neapel, v.20 p. 736. Pleon segments 1—4 each with a pair of strong spines [teeth] on its posterior margin near the middle dorsal line. Eyes reniform. Antenna 1, 24 joint narrower and longer than 1°, flagellum longer than peduncle, accessory flagellum 4-jointed. Antenna 2, peduncle shorter than peduncle of antenna 1, flagellum shorter than pedunele. Gnathopod 1, 5tk and 6th joints subequal, setose, 6% irregularly ovate, palm simple, oblique, ill-defined. Gnathopod 2 much larger, 5 joint short, cup-shaped, 6tb very large, seemingly piriform, finger elosing against its inner surface. Peraeopods 3—5, 24 joint rounded oblong, well expanded, especially in peraeopod 5, 46th joints very stout, finger small. Uropod 3, rami subequal, twice as long as peduncle, laminar. Telson with the halves laterally compressed, each terminating in 2 acute spines [teeth], and armed with a few short setae. L. 22 mm. Bass Strait (Tasmania). 3. E. suensis (Hasw.) 1879 Megamoera s., Haswell in: P. Linn. Soe. N. S. Wales, v.4 p.335 t.21 f.5 | 1884 M. s.?, M. haswelli, Miers in: Rep. Voy. Alert, p. 317, 318 | 1885 M. s. (part.), Haswell in: P. Linn. Soc. N. S. Wales, v.10 p.103 | 1899 Elasmopus s., T. Stebbing in: Tr. Linn. Soe. London, 'ser.2 2.7 p.426 | 1893 Ceradocus fasciatus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 723, 729. Body rather robust, peraeon segment 7 and pleon segments l and 2, each with 2 small dorsal teeth, segment 3 dorsally emarginate, not dentate, Elasmopus et: 443 segment 4 dorsally produced into 2 strong teeth. Head with a small lateral tooth behind the lateral lobes. Side-plates 1—4 rather deep, 1° in front rounded or subacute, not much produced. Pleon segment 3, postero-lateral corners truncated and armed with 3—5 teeth. Eyes oval, black. Antenna 1 elongate, 24 joint rather longer than 1°, 34 very short, accessory flagellum with 3 rather long joints. Antenna 2 shorter, ultimate joint of pedunele shorter than penultimate. Gmathopod 1 as in E. subcarinatus (p. 441). Gnathopod 2 5th joint short, broad, cup-shaped, 6 large, oblong, rounded at base, slightly widened distally, palm nearly transverse, not defined by a tooth, but diversified by a shallow emargination and 3 or 4 very obscure indications of teeth. Peraeopods 1 and 2 very slender, finger long. Peraeopods 3—5 as in E. subcarinatus. Uropod 3, rami subfoliaceous, rather narrow-ovate, and not greatly elongated. Telson, lobes subeylindrical, tipped with a few setae. Colour (in spirit) light brownish pink. L. 8—9 mm. Torres Strait (Sue Island, Albany Island);. Port Denison [East-Australia]. Depth 6—8 m. 4. E. brasiliensis (Dana) 1853 & 55 Gammarus b., J. D. Dana in: U.S. expl. Exp., v.13u p.956 t.65 f.10 | 1888 @. b,, Elasmopus (part.)?, T. Stebbing in: Rep. Voy. Challenger, v.29 p.267,516 | 1893 @.b., E.(part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 737, 927 | 1880 Moera b., Kossmann, Reise Roth. Meer,, ©.21 Malacost. p. 1352 | 1862 Gammarella b. + ?M. pectenicrus, M. pectinicrus, Bate, Ost. en Brit. Mus., p. 180 t.32 f.9; p.192 t.34 f. 8. Body smooth. Eyes small, and (Bate) irregular. Antenna 1, flagellum rather longer than peduncle, many-jointed, accessory flagellum very small and short (Dana), 2-jointed (Bate). Antenna 2 half as long as antenna 1, flagellum short. Mandible, 34 joint of palp (Dana’s figure) falcate, with long row of spinules. Gnathopod 1 small, 5t® and 6t% joints subequal, 6!" subovate, hirsute on hind margin. Gnathopod 2 very stout, 5% joint short, cup-shaped, 6'h large, piriform, densely furnished behind with long slender setae, palm oblique, not defined (Bate mentions a tubercle near the finger-hinge), finger long, eurved. Gmathopod 2 in 9 much smaller than in d, 6% joint subovate, setose. Peraeopods 1—5 apparently much as in E. subcarinatus (p. 441) and ‘other species; (Bate: peraeopod 4, 24 joint abruptly narrow distally). Uropods 1—3 subequal. L. 8—9 mm. Tropical Atlantie (Rio Janeiro); tropical Paeifie (New Guinea)? 5. E, pocillimanus (Bate) 1862 Moera p., Bate, Cat. Amphip. Brit. Mus., p.191 t.84 £.7 | 1888 Maera p., T. Stebbing in: Rep. Voy. Challenger, ©.29 p.535 | 1893 Elasmopus p., A. Della Valle in: F. Fl. Neapel, «20 p.733 t.1 f.4; t.22 £.23—25 | ?1874 Moera levis, (S.I. Smith in:) A. E. Verrill in: Rep. U.S. Fish Comm., v.1 p.559. Body very robust. Side-plate 1 rhomboidal. Pleon segment 3, postero- lateral corners produced, their hind margin crenulate. Eyes large, elliptie, tending to reniform, violet-brown. Antenna 1 nearly as long as body (Della Valle) or half as long (Bate), flagellum as long as peduncle, accessory flagellum rudimentary. Antenna 2 much shorter, flagellum very short. Gmathopod 1, 5 and 6th joimts equal, not large, finger small; 6tk joint differing on right and left side. Gmathopod 2, 5 joint short, eup-shaped, 6'h Jarge, long, a little narrowed distally, palm without processes or defining tooth, but im place of the latter having a bowl-shaped excavation of the inner surface for receiving the tip of the finger, which (Della Valle) is obtuse. Peraeo- pods 1—5 much as in the preceding species. Uropods 1—3 extending nearly to the same length. Uropod 3, rami scarcely longer than the peduncle, 444 Elasmopus fringed and tipped with short spines. Colour pellueid, lightly banded with crimson. L. 10 mm. Mediterranean (Italy); North-Atlantic (New Jersey, Long Island Sound, Vine- yard Sound)? 6. E. delaplata Stebb. 1888 E. d., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1025 t.99 | 1893 E. rapax (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 736. Body smooth. Head as in E. subcarinatus (p. 441). Side-plate 1 obtusely much outdrawn, 24 and 3% narrowing downward, 4 excavate behind, deeper than 5th, Pleon segment 3, postero-lateral corners subacute, a little outdrawn, their hind margin rather strongly serrate. Eyes small, oval, near margin of lateral lobes of head, white in spirit. Antenna 1 elongate, 1% joint stouter and longer than 24, 34 at least ?/, as long as 24, flagellum longer than peduncle, 35-jointed, accessory flagellum with 3 long joints and a short one. Antenna 2 much shorter, ultimate joint of pedunele rather shorter than penultimate, flagellum 16-jointed. Mandible, 3% joint of palp elongate, falcate, with long fringe of spinules. Maxilla 1, inner plate with 1 seta and 3 or 4 setules, outer plate with 7 spines. Maxilla 2, inner plate not fringed on inner margin. Gnathopods 1 and 2 nearly as in E.subcarinatus, but in gnathopod 2 palm with an irregular toothed eminence near finger-hinge, the strongly bent finger touching this but leaving a gap between its inner margin and the sinuously sloping remainder of the palm, and closing down between 2 small processes on inner surface of the 6!" joint. Peraeopods I and 2 slender. Peraeopods 3—5 moderately robust, but less stout than in most species, 24 joint oblong oval. Uropod 1 reaching beyond uropod 2, uropod 3 a little beyond uropod 1. Uropod 3, rami broad, lanceolate, the ends a little obtuse, not truncate, outer ramus rather longer than inner. Telson rather longer than broad, oval, cleft nearly to base, lobes only apically dehiscent, each with spine and cilium in notch of outer margin a little above the apex. L. 18 mm. South-Atlantie (Monte Video). Depth 1130 m. 7. E.rapax A.Costa 1853 E.r., A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p. 175 | 1889 E. r. (part.?), A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.124 t.11 f.1—8 (?f. 3) | 1894 E.r., G. O. Sars, Crust. Norway, ®.1 p. 521 t.183 | 1857 Gammarus brevicaudatus (non H. Milne Edwards 1840!), Bate in: Ann. nat. Hist., ser.2 v.19 p.145 | 1862 Mega- moera brevicaudata, Bate (& Westwood), Brit. sess. Orust., v.1 p.409 f..| 1862 M.b., Bate, Cat. Amphip. Brit. Mus., p.228 t.40 f.2 | ?1866 Maera b., Cam. Heller in: Denk. Ak. Wien, v.26u p.42 t.3 f.27,28 | 1871 Elasmopus latipes, A. Boeck in: Forh. Selsk. Christian., 1870 p.212 | 1876 E.Ll., A. Boeck, Skand. Arkt. Amphip., ©.2 p.393 t.24 f£.1 | 1887 E. 1, Chevreux in: Bull. Soe. zool. France, v.12 p.229 f.3 | 1893 E. affinis + E.rapax, A. Della Valle in: F. Fl. Neapel, ©.20 p.734 t.1 £.9, t.22 f.1—15; p. 736 t. 22 f. 16—22. Body robust, smooth. Head, lateral lobes broadly rounded, obtuse accessory lobe below the prineipal. Side-plate 1 angularly but very slightly produced in front, 4 excavate behind, much deeper than 5tt, Pleon segment 3, postero-lateral corners subquadrate, their hind margin indented. Eyes rounded oval, rather large, very dark (Sars), rosy, pale with white spots (Della Valle). Antenna 1, 1° and 24 joints subequal in length, 3X more than half as long as 24, flagellum rather shorter than peduncle, many-jointed, accessory flagellum 2-jointed. Antenna 2 much shorter, ultimate and penultimate joints of peduncle subequal, together longer than flagellum. Gnathopod 1, 6tk joint longer than 5th, oval quadrangular, palm nearly transverse, well-defined. Gnathopod 2 in JS, 5th joint short, broad, cup-shaped, 6!" powerful, somewhat piriform, u En are men Bleu =, dj» a te ET RZ, 6 year 3 ’ a Elasmopus 445 palm with rounded, denticulate lobe near finger-hinge, and 2 widely separated - dentiform projections from within the margin, finger very strong and curved; (Della Valle: 2 obtuse tubereles on the palm margin of E, affinis). In the oO the 5th joint is less broad, the 6! more regularly ovate, finger impinging against spines on inner surface but not into a groove. Peraeopods 1 and 2 of moderate size. Peraeopods 3—5 very robust (Sars: peraeopod 4 the longest, but?). Uropod 3 reaching somewhat beyond the others, rami stout, with truncate spinose apices, outer ramus rather the larger. Telson little longer than broad, cleft nearly to base, lobes oblong, scarcely divergent, 3 or 4 spines in subapical notch, of outer margin. Colour greyish or yellowish, sometimes with dark spots (Della Valle). L. 8—10 mm. North-Atlantie (Christianiafjord, British Isles, France, Azores); Mediterranean. 8. E. viridis (Hasw.) 1879 Moera v., Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.333 t.21 f.1 | 1899 Elasmopus v., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 x.7 p.426 | 1883 Moera incerta, Chilton in: Tr. N. Zealand Inst., v.15 p.83t.3 f.3| 1893 Maera truncatipes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 725. Body smooth. Side-plates 1—4 very shallow. Eyes round. Antenna 1, 24 joint slightly narrower and a little longer or shorter than the elongate 1°; 34 short; flagellum not so long as peduncle, 15—20-jointed; accessory flagellum half as long as primary, with 5—8 long joints. Antenna 2, peduncle subequal to peduncle of antenna 1; ultimate joint of peduncle shorter than pen- ultimate; flagellum not quite as long as ultimate joint of peduncle, 7—9-jointed. Gnathopod 1 small, 5tk joint about as long as ovate 6t", palm rather oblique, moderately well defined. Gnathopod 2 in JS, 5t% joint cup-shaped, 6! very large, oblong, a little widened distally, palm transverse, crenulate, with small central gap, defined by one tooth (not 3), finger with central cavity and pronounced tooth matching hollow of palm; 6% joint in 9 with the palm straight (Chilton: palm defined by a short stout tooth, with short stout setae along the whole.) Peraeopods 1 and 2 rather slender; peraeopods 3—5 stout (Chilton: finger with a produced point behind the nail). Uropod 3 reaching little beyond the others, rami broad, truncate, apically spinose, outer sometimes the longer, with 2 groups of spines on outer margin. Telson eleft nearly to base, lobes oblong, searcely dehiscent, with spines in bidentate apices. Colour light green. L. 5—6 mm. South-Paeific (Port Jackson [East-Australia]; Lyttelton Harbour Mew Zealand]). 9. E.boeckii (Hasw.) 1879 Megamoera b., Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.336 t.21 f.6 | 1898 Maera? b., A. Della Valle in: F. Fl. Neapel, v.20 p.732 | 1899 Elasmopus b., T: Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 426. Eyes oblong. Antenna 1, 1% and 24 joints subequal, 39 short, flagellum longer than pedunele, accessory flagellum with 4_long joints. Antenna 2 much shorter, flagellum a little longer than ultimate joint of peduncle. Gnathopod 1, 6% joint ovate, hirsute, palm undefined. Gnathopod 2 much larger, 5" joint not very broad, cup-shaped, 6tk described as ovate (figured as oblong), twice as long as broad, palm oblique, slightly excavate, with 4 small teeth, finger rather more than '/, as long as 6" joint. Peraeopods 3—5 rather stout, serrated. Uropod 3 short, broad, truncate, spinose. L. 4 mm. Port Jackson [East-Australia]. E. crassimanus (Miers) 1884 Moera crassimana, Miers in: Rep. Voy. Alert, p- 316 | 1899 Elasmopus crassimanus, T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 426. 446 Elasmopus, Plesiogammarus Body smooth. Pleon segments 1—3, postero-lateral corners acute, little produced. Gnathopod 1, 5th joint little shorter than 6th. Gnathopod 2, 5th joint broad, 6th longer than broad, narrower distally, with the distal margin very oblique, not acute, but presenting a broad surface, against which the strong arcuate finger eloses, and armed with 4 spines or lobes, of which the inner 2 are small. Peraeopods 3—5 rather robust, 2d joint not serrated. Uropod 3, rami subequal, broader and slightly shorter than the others. Port Jackson [East-Australia]. E. erythraeus (Kossm.) 1880 Moera erythraea, Kossmann, Reise Roth. Meer., v.2ı Malacost. p. 132 t.14 f.1—8 | 1888 Elasmopus erythraeus, T. Stebbing in: Rep. Voy. Challenger, v.29 p.516 | 1893 E. rapax (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 736. Probably the young of another species of Elasmopus. L. about 6 mm. Red Sea. E. miersi (Wrzesn.) 1879 Maera m., Wrzesniowski in: Zool. Anz., v.2 p. 348 | 1888 M. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 502 |'1893 M. m., A. Della Valle in: F. Fl. Neapel, v.20 p.732 | 1899 Elasmopus m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.426. L. 9 mm. Chimbote Bay [Peru]. Under stones in tide-pools. E. peruvianus (Dana) 1852 Amphithoe peruviana, J. D. Dana in: P. Amer. Ae., u.2 p.215 | 1855 & 55 Gammarus? peruvianus, J. D. Dana in: U.S. expl. Exp., v.lönm p. 958 1.66 f.2 | 1893 Elasmopus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p: 454 | 1862 Megamoera perwviensis, Bate, Cat. Amphip. Brit. Mus., p.231 t.40 £. 8. Near E. brasiliensis (p. 4438), compare also E. delaplata (p.444). Peraeopods 1 and 2 about as long as peraeopod 5, whieh is longer than peraeopod 4. L. about 12 mm. Tropical Pacific (Island of San Lorenzo [Peru]. Among sea-weed on the shore. 35. Gen. Plesiogammarus Stebb. 1899 Plesiogammarus (Sp. typ-: P. gerstaeckeri), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 426. Near to Gammarus (p. 460), with 6 joint of gnathopod 1 smaller than that of gnathopod 2, but with marginal inflation of many segments, some dorsal setae but no dorsal spines, peduncle of antenna 1 longer than peduncle of antenna 2, 24 joint of peraeopods 3—5 long and narrow, uropod 1 reaching end of the short uropod 3 and telson not cleft to the base. l species. 1. P. gerstaeckeri (Dyb.) 1874 Gammarus g., B. Dybowsky in: Horae Soc. ent. Ross., v. 10 suppl. p. 108 t.14 f.5 | 1899 Plesiogammarus g., T. Stebbing in: Tr. Linn. Soe. London, ser. 2 ©.7 p.426 | 1898 Gammarus loeusta (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Peraeon segments 1—7 and pleon segments 1—3 with clear marginal swellings, pleon segment 3 on upper surface and segments 4—6 on hind margin carrying a few tolerably long setae. Head with short rostral point, at the sides inflated over the eyes. Side-plates 1—4 small, regularly rounded below. Eyes of varying size and shape, usually reniform, more rarely roundish or punetiform, white. Antenna 1 as long as body or sometimes shorter, 4 times as long as antenna 2, pedunele stouter and somewhat longer than pedunele of antenna 2, 18 joint stout, as long as 24 and 34 combined, flagellum 47-jointed, accessory flagellum 3- or 4-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, thickened distally and there carrying a cirelet of plumose TOTER Plesiogammarus, Iphigenella 447 setae, flagellum 4-jointed. Gnathopods 1 and 2, 5th joint short, 6'h slenderly oblong, in gnathopod 2 considerably larger than in gnathopod 1 and slightly widening at the palm, which in both is much shorter than the hind margin. Peraeopods 3—5, 24 joint narrow, almost rod-like, a little wider above than below, 4—5 times as long as broad, without setae on hind margin, while the 4th and 6t% joints of these limbs, the margins of peduncle in uropods 1 and 2 and the lateral surfaces of the pleon segments are beset with numerous long setae. Uropod 1 reaching end of uropod 3 or somewhat beyond. Uropod 2 reaching scarcely °/, length of uropod 3. Uropod 3 of !/,;—"/, length of body, rami equal, beset with simple setae. Telson broader than long, divided beyond the middle but not nearly to the base, lobes with numerous apical setae. Colour yellow. L. reaching 16 mm. Lake Baikal. Depth 20—100 m. 36. Gen. Iphigenella 0. Sars 1896 Iphigenella (Sp. typ.: I. acanthopoda) (Iphigeneia O. Grimm in MS.), G. O. Sars in: Bull. Ae. St.-Pötersb., ser.5 v.4 p.478. Body almost smooth, robust, pleon segments 4 and 5 with a few dorsal hairs and a pair of subdorsal spinules, segment 6 with 2 pairs of spinules. Side-plates rather large, not setiferous. Antenna 1 the longer, with accessory flagellum. Mouth-parts nearly as in Gammarus (p. 460), but with inner lobes indicated inlower lip. Gnathopod 1 with short 5!" and large 6th joint. Gnathopod 2 with 5tk and 6tk joints elongate, slender. Peraeopods 1—5 narrowly sub- chelate. Peraeopods 3—5 rather short and stout, .24 joint well expanded. Uropod 3 not very large, outer ramus much longer than pedunele, 2-jointed, inner ramus scale-like. Telson narrow, cleft to the base. 1 species. 1. L.acanthopoda O.Sars 1896 I.a, G.O.Sars in: Bull. Ac. St.-Pötersb., ser.5 ©.4 p.478 t.12 £. 1—17. Body moderately compressed. Pleon segments 4—6 slightly carinate. Head scarcely rostrate, lateral lobes obliquely truncate. Side-plates 1—4 rather deep, 4tk the largest, much deeper than broad, emarginate, 5tk with front and hind lobes subequal. Pleon segment 3, postero-lateral corners acutely subquadrate. Eyes small, oval, dark. Antenna 1 more than U, a8 long as body, pedunele shorter than in antenna 2, 1% joint longer than 24 and 34 combined, flagellum twice as long as peduncle, 17-jointed, accessory flagellum 4-jointed. Antenna 2 rather stouter, ultimate and penultimate joints of pedunele subequal, flagellum little shorter than peduncle, 10-jointed. Gnathopod 1, 5tk joint short, cup-shaped, 6tk powerful, irregularly oval, widening to the rather oblique, sinuous palm, which is about equal to the hind margin and has a strong spine near the middle and 2 at the obtusely rounded palmar angle, finger long and faleiform. Gmathopod 2, 5tk joint long, a little wider and shorter than the sublinear 6%, both setose, palm transverse, extremely short, finger to match. Peraeopods 1 and 2 alike, rather slender. Peraeopods 3—5 subequal, shorter than peraeopods 1 and 2, 24 joint in . peraeopods 3 and 4 quadrangular oval, widest above, in peraeopod 5 obliquely expanded, produced below in a broadly rounded lobe. In all peraeopods the 6 joint has a wide apex armed with stout spines, forming a kind of palm, against which the short, strongly curved finger impinges. Uropods 1 and 2, ER N EN ET BE ES a N F Kr. el Zu 448 Iphigenella, Pandorites outer ramus shorter than inner, each with several spines at apex. Uropod 3 projecting much beyond the others, outer ramus nearly thrice as long as peduncle, with 2 sets of spines on outer, 3 on inner margin, 24 joint spiniform, almost as large as the little inner ramus. Telson nearly twice as long as broad, lobes little tapering or divergent, each with 3 spinules on the obtuse apex. L. 9 mm. Caspian Sea. Sometimes on Astacus leptodactylus, probably semiparasitic. 37. Gen. Pandorites 0. Sars 1895 Pandorites (Sp. typ.: P. podoceroides) (Pandora (non Bruguiere 1797, Mollusea!) O. Grimm in MS.), G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.3 p. 287. Body little compressed, smooth, pleon segments 4—6 short and stout, with a few dorsal hairs and spinules. Side-plate 4 the largest, only slightly emarginate. Eyes on lateral lobes of head. Antennae 1 and 2 slender, short, equal, antenna 1 with accessory flagellum. Upper lip rounded. Lower lip without inner lobes, and mouth-parts in general as in Gammarus (p. 460). Gnathopods 1 and 2 alike in S and in oO, very unequal, in gnathopod 1 6'h joint small, ovately piriform, in gnathopod 2 very large, expanding to the long, oblique palm. Peraeopods 1—5 not very long. Peraeopod 5, 24 joint much expanded, with produced lobe at lower hind corner. Uropod 3 very small, outer ramus short, its 24 joint minute, inner ramus scale-like. Telson short, cleft to the base. l species, 1. P. podoceroides ©. Sars 1895 P.p., G. O. Sars in: Bull. Ace. St.-Petersb., ser.5 v.3 p.287 t.19. In form - resembling a species of Ischyrocerus (p. 657), slender, with broadly rounded back. Head with angular front slightly projecting, lateral lobes evenly rounded, prominent; post-antennal corners acute, curving forward. Side-plate 1 small, narrowing distally, more setose than the rest, 4! almost square, but with convex lower and slightly concave hind margin. Pleon segments 2 and 3, postero-lateral corners smooth, quadrate. Eyes close to margin of lateral lobes of head, oval, dark. Antenna 1, 1° joint longer than 24 and 34 combined, 2 scarcely twice as long as 34, flagellum not quite as long as peduncle, 7-jointed, accessory flagellum small, 4-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 5-jointed. Gnathopod 1 setose, 5!" joint short, cup-shaped, 6% rather tumid, palm scarcely defined except by the palmar spines. Gmathopod 2 less setose, 24 joint with very convex hind margin, 5% joint short, with short and narrow setiferous lobe, 6! somewhat flattened, palm longer than hind margin, much curved, very oblique, its edge sharpened and fringed with setules; of the palmar spines one very slender and long, finger long and faleiform. Peraeo- pods 1 and 2 very setose, 1° rather the longer. Peraeopods 3—5 rather strong, not elongate, 24 joint in peraeopod 3 oblong oval, in peraeopod 4 longer, scarcely broader, narrowing distally, with sinuous hind margin; 24 joint in peraeopod 5 greatly expanded, widest below the middle, the obscurely serrate hind margin unarmed, its lower lobe not greatly produced downward, front margin densely setose below. Uropods 1 and 2 rather short and stout, rami subequal, each with apical spines, also 1 lateral spine, except on outer ramus of uropod 2. Uropod 3 reaching little beyond the others, outer ramus scarcely longer than peduncle, with 1 lateral and 2 apical spines, the tiny 2 STE NE EEE FRTERE a AP 449 Pandorites, Pherusa 24 joint tipped with setules, inner ramus less than '/, as long as outer, with 1 apical seta. Telson little longer than peduncle of uropod 3, broader than long, lobes not divergent, a spine and hair on each broad apex. L.o1l, S 13 mm. Caspian Sea. Depth 13—90 m. 38. Gen. Pherusa Leach 1813/14 Pherusa (Sp. un.: P. fueieola), Leach in: Edinb. Ene., v.7 p.432 | 1891 ‚P., A. O. Walker in: Ann. nat. Hist,, ser.6 v.7 p.418; v.8 p.81 | 1891 Pr; Pocock in: rt nat. Hist., ser. 6 v.7 p.550 | 1857 Gammarella (Sp. un.: @. orchestiformis), Bate in: Ann. nat. Hist., ser.2 v.19 p.143 | 1893 @., G.O. Sars, Crust. Norway, v.1 p. 446. Body smooth. Head without acute rostrum. Antenna 1 the longer, 24 joint of peduncle elongate, accessory flagellum developed. Upper lip smoothly rounded. Lower lip with inner lobes. Mouth-organs normal. Mandibular palp slender, 24 and 34 joints elongate. Maxilla 1, inner plate with about 18 setae, outer with 11 spines. Maxilla 2, inner margin of inner plate fringed with setae. Gnathopods 1 and 2 subchelate. Gmnathopod 2 differing greatly in the two sexes. Peraeopods 1 and 2 slender. Peraeopods 3—5 with 24 joint expanded, especially in peraeopod 5. Uropods 1—-3 short. Uropod 3, outer ramus little longer than pedunecle, inner much shorter. Telson deeply cleft. 1 species. 1. P. fucicola Leach 1813/14 P. f., Leach in: Edinb. Ene., v.7 p.432 | 1816 P.f., Leach in: Ene. Brit., ed.5 suppl.1 p.426 t.21 £. | 1862 P. f. (part.), Bate & Westwood, Brit. sess. Crust., v.1 p.255 f.z dorsal view | 1893 Melita f.. A. Della Valle in: F. Fl. Neapel, v.20 p.709 t.1 £.8; t.24 f. 1--19 | 1898 M. f., Sowinski in: Mem. Soe. Kiew, v.15 p.486 t.11 £.10—19; t.12 f.1—4 | 1830 Gammarus brevicaudus + Amphithoef., H.Milne Edwardsin: Ann. Sei. nat., v.20 p.369; p.377 | 1840 @. brevicaudatus, H. Milne Edwards, Hist. nat. Crust., v.3 p.53 | 1857 Amphithoe micrura + A. semi- carinata + G. obtusunguis (part.: 3 juv.) + @. punctimanus, A. Costa in: Mem. Ace. Napoli, v.1 p.209 t.3 £.2; p.210t.3 £.3; p.219.3f.8; p.222 t.3 f.6 | 1857 Gammarella orchestiformis, Bate in: Ann. nat. Hist., ser.2 v.19 p.143 | 1862 @. normanni (2), Bate & Westwood, Brit. sess. Crust., v.1 p.333 | 1862 @. brevicaudata + Gammarus Punctatus (laps., eorr.: G. punetimanus), Bate, Cat. Amphip. Brit. Mus., p. 180 t. 32 f.8; p- 224 | 1874 Gammarella b., T. Stebbing in: Ann. nat. Hist., ser. 4 0.14 p.13 t.2 f.3a—g | 1888 G.b., T. Barrois, Cat. Crust. Acores, p.47 t.4 f.5—12 | 1889 @. b., A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.128 | 1885 @. longicornis, R. Koehler in: Bull. Soc. Naney, v.17 p. 67. Pleon abruptly depressed and abbreviated behind segment 4, which is more or less obtusely carinate but not at all dentate, segments 5 and 6 with a couple of minute dorsal spinules.. Eyes small, round, tinged with red. Antenna 1, 24 joint nearly as long as 1%, flagellum longer than peduncle, sometimes nearly twice as long, accessory flagellum with 4 tolerably long joints. Antenna 2 much shorter, slender, ultimate joint of peduncle rather shorter than penultimate, flagellum about 20-jointed, subequal to peduncle. Gnathopod 1, 6 joint shorter than 5tk, widening somewhat to the palm, which is almost transverse, matching the short finger. Gnathopod 2 in Q, 6% joint longer than 5", not widening, palm short, transverse, finger short. Gnathopod 2 in J very unlike that of Q, 5tk joint very short, 6th very large, almond-shaped, narrowest at the finger-hinge, the long oblique palm, except in the young form, scarcely at all distinet from the hind margin, fringed with setae and carrying within the margin a.row of spinules, finger very Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 29 450 Pherusa, Niphargoides large, curved, sometimes overlapping the whole length of the hand, but shorter in young d. Peraeopods 1 and 2, 4 joint scarcely dilated, longer than 5th, 5th than 6tk, Peraeopods 3 and 4, 24 joint moderately expanded, more above than below. Peraeopod 5, 24 joint very wide at the middle. Pleopods with many coupling spines on the peduncle. Uropods 1—3 reaching about equally far back. Uropod 3, outer ramus seemingly with minute 24 joint, inner scarcely half as long or half as wide as outer. Telson subquadrate, cleft about °/, of length, with spinule in each rounded apex. Colour yellowish brown. 1L.'7—12(?) mm. North-Atlantie (South-England, shore at very low tides; Channel Islands; Scotland, Firth of Clyde; France; Azores); Mediterranean; Bläck Sea. Down to 84 m. 39. Gen. Niphargoides 0. Sars 1894 Niphargoides (Sp. typ.: N. caspius), G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.1 p.371. Akin to Pontoporeia (p. 127) and Gammarus (p. 460) ratherthan Niphargus (p. 405). Body. nearly smooth, robust. Head not rostrate. Side-plates 1— 4 not very large, setiferous, 4!" the largest, excavate behind. Antennae 1 and 2 short, subequal; antenna 1 with accessory flagellum usually more than l-jointed. Lower lip with inner lobes. Mandibular palp large. Maxillipeds, 34 joint of palp slender. Mouth-parts otherwise as in Gammarus. Gnatho- pods 1 and 2 well developed, subchelate, 24 usually the stronger. Peraeopod 5, 24 joint much more expanded than in peraeopods 3 and 4, hind margin, like the peraeopods in general, strongly setiferous. Uropods 1 and 2 with equal rami. Uropod 3 not very large, outer ramus much the larger, 2-jointed, inner ramus scale-like. Telson cleft to the base. 7 species. Synopsis of species: Gnathopods 1 and 2, hind margin longer than palm 2. N. corpulentus. . p.451 d Gnathopods 1 and 2, hind margin shorter than palm 3. N. ecompactus . . p.451 Uropod 3, 2d joint of outer ramus rudimentary — 2. 1 Uropod 3, 2d joint of outer ramus distinctly developed — 4, Gnathopods 1 and 2, 6th joint narrowing towards 0 hs Da 7 Er 1. N. caspius. . . . p.450 Gnathopods 1 and 2, 6th joint not narrowing towards the palm — 38, Uropod 3, 24 joint of outer ramus much shorter j Than DT FB 5 0 RE 4. N.grimmi. . . . p.452 > | Uropod 3, 2d joint of outer ramıus not much shorter than inner ramus — 5. 5 Lobes of telson strongly divergent. .. ... . 5. N. quadrimanus . p.452 Lobes of telson not strongly divergent — 6. 6 | Gnathopods 1 and 2 subequal. . ... 2... 6. N. aequimanus . p.453 Gnathopod 1 considerably smaller than gnathopod 2 7. N. borodini . . . p.458 1. N. caspius O. Sars 1894 N. ce. (Niphargus c. O. Grimm in MS.), G. O. Sars in: Bull. Ac. St.-Pötersb., ser.5 v.1 p.372 t.16. Body rather elongate, but robust and uncompressed, with only 2 dorsal spinnles on pleon segment 6. Head, lateral lobes rounded, little prominent. a re FRE EEE, OBERE Niphargoides 451 Side-plates 1—4 densely setiferous, 1° not expanded distally. Pleon segments 2 and 3, postero-lateral corners nearly quadrate, with a short oblique row of setules on outer surface, descending to the angle. Eyes not large, oval reniform, dark. Antenna 1 about '/, as long as body, 1° joint massive, much longer than 24 and 34 combined, 24 about twice as long as 34, flagellum 7-jointed, accessory flagellum 3-jointed. Antenna 2 slightly longer, antepenultimate joint of peduncle stout, with densely setose angular projeetion below, ultimate joint shorter than penultimate, flagellum 5-jointed. Gnathopods 1 and 2 similar, 5tk joint short, cup-shaped, 6! elongate, gradually tapering to the very oblique palm, which is much shorter than hind margin, and chiefly defined by 2 strong spines; gnathopod 2 much the larger. Peraeopods 1—5 densely setiferous, 1% and 24 with 4th joint large, widening distally, 39 and 4th with 24 joint oblong oval, narrowing distally, peraeopod 5, 24 joint much more expanded, broadly oval, hind margin evenly curved. Uropods 1 and 2, each ramus armed at apex with 4 blunt spines, and with 1 on the lateral margin. Uropod 3, pedunele with fringe of spines, outer ramus not twice as long as peduncle, rather broad, distal half fringed with plumose setae, 2 spines on outer margin, 24 joint minute; inner ramus shorter than peduncle, tipped with 1 spine. Telson, lobes rather divergent, each with 3 spines on the obtusely truneate apex. L. 11 mm. Caspian Sea. Depth 66—75 m. 2. N. corpulentus O.Sars 1895 N.c., G.O.Sars in: Bull. Ace, St.-Pötersb., ser.d5 v.3 p.275 t.17 f.1—19. oO unknown. — G. In general like N. caspius, differing as follows. Body more robust and with pleon segments 4—6. slightly raised dorsally, carrying a few small hairs, and with 2 subdorsal spinules on pleon segments 5 and 6; side-plates 1—4 larger and less densely setiferous; pleon segment 2 ‘ without the oblique row of setules. Antenna 1, flagellum 8-jointed, accessory flagellum 4-jointed ; antenna 2 seareely longer, flagellum 6-jointed. Gnathopods 1 and 2 less powerful, 6*% joint not tapering, but oblong quadrangular, with palm less oblique and defined by a distinet angle, carrying 2 or 3 unequal spines. Peraeopods 1 and 2, 5{k joint rather wider; peraeopod 3, 24 joint more regularly oval; peraeopod 4, 24 joint narrow, elongate, with the hind margin slightly sinuous; peraeopod 5, 24 joint greatly expanded, broadly heart-shaped, widest below, the long setae of the strongly curved hind margin springing from small serrations. Uropods 1 and 2, rami less blunt, with the spines more distributed; uropod 3, outer ramus about twice as long as peduncle, inner tipped with 2 spines, and carrying 3 setules on inner margin. Telson with lobes rather less divergent, each broad apex carrying 5 spines. L. 14 mm. Caspian Sea. Di 3. N. compactus O0. Sars 1895 N. c., G. ©. Sars in: Bull. Ace. St.-Pötersb., ser. 5 v.3 p. 278 1.17 £.14—19. - 9 unknown. — d. Agreeing nearly with N.corpulentus. Body extremely robust and compact, peraeon segments 6 and 7 and pleon segments 1—3 each with transverse dorsal furrow, pleon segment 5 carıying 2, segment 6 having 4 subdorsal spinules. Side-plate1 distally expanded. Antenna 1, 24 joint more than thrice as long as 34, longer than the 9-jointed flagellum, accessory flagellum 4-jointed. Antenna 2, ultimate and penultimate joints of pedunele eomparatively slender, flagellum very short, 6-jointed. Gnathopods 1 and 2 similar, powerful, with piriform hand, thus differing in shape from those in other 29* ee Bu 452 Niphargoides species, the 6'% joint being very tumid at the base, the palm very oblique, well defined, much longer than the hind margin, gnathopod 2 much the larger, with the palmar angle more projecting; finger long, curved. Uropod 3, outer ramus nearly thrice as long as peduncle, sublaminar, fringed almost all round, 24 joint almost evanescent, inner ramus with 7 plumose setae a inner margin and 2 spines at apex. Telson with 4 spines at each apex. . 17 mm. North Caspian Sea. 4. N. grimmi 0. Sars 1896 N. g., G. O. Sars in: Bull. Ac. St.-Pötersb., ser. 5 v.4 p.A7L t.11 £.1-—12. Resembling N. taspius (p. 450). Appendages much less hirsute. Body robust, pleon segments 5 and 6 each with 2 dorsal spinules. Head, lateral lobes narrowly rounded. Side-plates I—4 fringed with rather short setae. Pleon segment 2, postero-lateral corners quadrate, segment 3, postero-lateral corners acutely produced, with a few setules on the margin. Antenna 1, flagellum 5-jointed, accessory flagellum 2-jointed, the 24 joint minute. Antenna 2 not longer, flagellum 3-jointed. Gnathopods 1 and 2, 6% joint rather elongate, oblong, slightly widening to the palm, which is not very oblique, well defined, with 2 palmar spines, one of them very long; gnathopod 2 nearly twice as large as gnathopod 1. Peraeopod 3, 24 joint piriform. Peraeopod 4, 24 joint little widened, hind margin sinuous. Peraeopod 5, 24 joint greatly expanded, little longer than broad, widest at about the middle, fringed behind with hair-like setules. Uropod 3, outer ramus with fringing setae not close set, 24 joint very small, but well defined and obvious, inner ramus nearly as long as peduncle, tipped with 2 spines. Telson rather longer than broad, lobes little divergent, 4 spines on each apex. L. 8 mm. Caspian Sea. Depth 47—169 m. 5. N. quadrimanus O. Sars 1895 N.gq., N. quadrimanus, G.O.Sars in: Bull. ° Ace. St.-Petersb., ser.5 v.3 p.281; t.18 f. 1—18. Body not very robust, somewhat compressed, pleon devoid of subdorsal spinules. Head, lateral lobes broadly rounded. Side-plate 1 scarcely expanded distally, 4!" about as wide as deep. Pleon segment 3, postero-lateral eorners quadrate, with no oblique row of setules. Eyes rather small, oval reniform, dark. Antenna 1, 1° joint twice as long as 24 and 34 combined, 24 twice as long as 34, flagellum about 11-jointed, accessory flagellum 6-jointed. Antenna 2 equal to antenna l, peduncle geniculate between antepenultimate and penultimate joints, both of which are expanded below to setiferous lobes, ultimate joint nearly as long as penultimate, both spiniferous, flagellum 10-jointed. Gmnathopods 1 and 2, 6tk joint oblong quadrangular, palm not very oblique, defined by a distinet angle armed with 3 unequal spines; in gnathopod 1 the hand inelines to oval, but in the larger gnathopod 2 its great breadth, encreasing slightly towards the palm, gives it an almost square appearance. Peraeopods I and 2, 4th joint large, setiferous chiefly on hind margin, 5tb joint not much expanded, 6, as usual in the genus, linear. Peraeopod 3, 24 joint regularly oval. Peraeopod 4, 24 joint much longer, and below narrower, hind margin sinuous. Peraeopod 5, 24 joint greatly expanded, greatest width near distal end, hind margin fringed with short setae, lower front angle and 4 and 5tk joints, as in peraeopod 4, very hirsute. Uropods 1 and 2,.rami subequal, each with 5 apical spines and one lateral spine. Uropod 3 projecting far beyond the others, outer ramus with 2 sets of spines on outer margin, fringing setae Dh u" | ul an ud nl ra a a | Niphargoides, Phreatogammarus 453 scattered and simple, 24 joint not much shorter than inner ramus, which has 2 apical spines. Telson rather small, lobes strongly divergent, each with 1 apical spinule. L. 10 mm. Caspian Sea. Depth 13—37 m. 6. N. aequimanus 0. Sars 1895 N. a., N. aegvimanus, G. O. Sars in: Bull, Ae. St.-Petersb., ser.5 v.3 p.285; t.18 f. 14—23. Resembling N. quadrimanus. Lateral lobes of head narrowly rounded. Side-plate 1 distally widened. Antenna 1, flagellum 7-jointed, accessory flagellum 5-jointed; antenna 2, flagellum 7-jointed. Gnathopods 1 and 2 nearly equal, as well as similar, 6t joint oblong quadrangular, palm nearly transverse, much shorter than hind margin. Peraeopods 3 and 5, 24 joint almost as broad as long, the setae on hind margin in peraeopod 5 fewer than in N. quadrimanus. Uropods 1 and 2 without the lateral spine; uropod 3 with more elongate ramus, thrice as long as pedunele, inner ramus with 1 apical spine. Telson with broader lobes, not divergent, 2 unequal spinules on each apex. L. 5 mm. Caspian Sea. Depth 19 m. 7. N. borodini 0. Sars 1897 N.b., G. O. Sars in: Annuaire Mus. St.-Petersb.,” 0.2 P.290 1.15 £.4—9. QO. Body somewhat elongated, back broadly rounded, quite smooth. Head, lateral corners produced, narrowly rounded. Side-plates I1—4 com- paratively large, 1° not distally widened, 4!" deeper than wide. Pleon seg- ment 3, postero-lateral corners subquadrate, with no oblique row of setules. Eyes not very large, oval reniform, dark. Antenna 1, 1° joint very large, twice as long as 24 and 34 combined, distally rather narrowed, flagellum not half as long as peduncle, 8-jointed, accessory flagellum 6-jointed. Antenna 2 as long as antenna 1, antepenultimate and penultimate joints of peduncle with setiferous lobes, ultimate joint linear, nearly as long as the .9-jointed flagellum. Gnathopods 1 and 2 strong, 3?—5tk joints short, 6!" large, tending to quadrate in form, but widening distally to a somewhat oblique palm, defined by a spiniferous obtuse point; hand, palm, and finger considerably larger in gnathopod 2 than in gnathopod 1. Peraeopods I—5 and uropods 1 and 2asin N. quadrimanus. Uropod 3 projeceting much beyond the others, outer ‚ramus more than twice as long as peduncle, 1° joint spinose, 2% longer than the scale-like inner ramus, setose all round, inner ramus with 3 apical spines. Telson with oblong oval lobes, scarcely divergent, each with 3 spinules on blunt apex. L. 13 mm. — d unknown. Caspian Sea. - 40. Gen. Phreatogammarus Stebb. 1899 Phreatogammarus (Sp. typ.: P. fragilis), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p». 427. Near to Gammarus (p. 460). Without eyes. Upper. lip broader than deep. Mandible, 1° joint of palp not very short. Gmathopods 1 and 2 equal. Peraeopods 1 and 2 much shorter than peraeopod 3, peraeopod 5 the longest, with its 6!" joint longer than any of the other joints. Uropod 3 long, with equal 1-jointed eylindrical rami. l species. 454 Phreatogammarus, Ommatogammarus 1. P. fragilis (Chilton) 1882 Gammarus f., Chilton in: N. Zealand J. Sei. v.1 p.44 | 1882 @. f., Chilton in: Tr. N. Zealand Inst., ©. 14 p. 179 t.9 f. 11—18 | 1889 @. f., Moniez in: Rev. biol. Nord France, v.1 p.253 | 1890 @. f., Wrzesniowski in: Z. wiss. Zool., v.50 p. 611, 698 | 1894 @. f., Chilton in: Tr. Linn. Soc. London, ser.2 ®.6 p. 227 t.21 f.1—25 | 1899 Phreatogammarus f., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.427 | 1893 Gammarus flwviatilis (part.), A. Della Valle in: F. Fi. Neapel, v.20 p. 768. Body rather slender; pleon segments 4—6 each with 4 or 5 dorsal long spine-like setae. Head without rostrum, lateral angles broadly rounded, little produced. Side-plates rather shallow. Pleon segments 2 and 3 with postero- lateral angles blunt. Antenna 1 subequal to body, 1° joint long, not quite as long as 24 and 3X combined, flagellum many-jointed, more than twice as long as peduncle, accessory flagellum 6—9-jointed. Antenna 2 more than half as long as antenna 1, ultimate joint of pedunele slightly longer than penultimate, flagellum subequal to pedunele, about 20-jointed. Upper lip nearly semieircular, much broader than deep. Lower lip without inner lobes. Mandible, 1° joint of palp nearly halfaslong as 24, distally a little widened. Gnathopods 1 and 2 in Q rather large, 6% joint ovate, palm very oblique, finger long, curved. Peraeopods 1 and 2 slender. Peraeopods 3—5 long, 24 joint not very wide, narrowing downward, finger small. Peraeopods 4 and 5 with 6!" joint much the longest. Peraeopod 5 nearly as long as body. Uropod 3 extending much beyond the ‚others, the rami about twice as long as peduncle, scarcely tapering, each with 5 groups.of 3 spines and an apieal group of 6 or 7 spines. Telson short, the lobes almost rectangular, each with 4 or 5 spines on the obtusely truncate apex and 2 or 3 a little above on outer margin. Colour white, semitransparent. L. reaching 15 mm. New Zealand. Wells. 41. Gen. Ommatogammarus Stebb. 1899 Ommatogammarus, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.427. Near to Gammarus (p. 460). Dorsal spines only on pleon segments 4—6. Eyes irregular, with indented outline (Fig. 86). Antenna 1 the longer, but with pedunele usually shorter than that of antenna 2; accessory flagellum of more than 1 joint (Fig. 86). Upper lip narrowed to a rounded apex. Lower lip, inner lobes rudimentary. Mandible, 34 joint of palp not very elongate. Maxilla 1, inner plate fringed with numerous setae, outer carrying 11 spines, 24 joint of palp with about 10 spine-teeth on one maxilla and short spines on the other. Maxillipeds, outer plates reaching far along 24 joint of palp, spine-teeth and setae numerous. Gnathopod 1, 6fk joint ‘not smaller than that of gnathopod 2. Uropod 3, outer ramus about twice as long as inner, with simple setae on its outer margin, inner ramus with feathered setae on both margins. Telson cleft to the base. 4 species. Synopsis of species: | Dorsal margin of head abruptly bent downward — 2. 1 | Dorsal margin of head not abruptly bent down- ward — 3. 9 j Eyes with hind margin acutely indentured ... . 1. O.albinus. . . . p.455 \ Eyes with hind margin obtusely lobed .... . . 2. O.Bavus .. ..p.455 3 | ya ed HS RN ae 3. O. carneolus.. . . p.456 UÜEyen mare an 4. O. amethystimus . p. 456 Ommatogammarus 455 1. O. albinus (Dyb.) 1874 Gammarus a., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.71 t.9 f.3 | 1899 Ommatogammarus a., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.427 | 1898 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 9297. Dorsal spines on pleon segments 4—6 very delicate, and solitary at the places corresponding to lateral groups. Head abruptly bent down- ward, the dorsal line being connected by a short eurve with a frontal part at right angles to it. Eyes deep, celosely adjoining the upright front of head, front margin slightly concave (Fig. 86), hinder cut into very unequal lobes, some of which are acute, clear flesh-coloured or white with a dash of rose- red. Antenna 1 (Fig.86) about '/, as long as body and twice as long as antenna 2, peduncle rather shorter (or in Q sometimes a ORTE little longer) than peduncle of antenna 2, er atEirgen 1° joint thick, longer than 24 and 34 combined, ' flagellum 3 or 4 times as long as the short pedunele, 38-jointed, accessory flagellum 6—8- jointed. Antenna 2 (Fig. 86), ultimate and pen- ultimate joints of peduncle subequal, flagellum : 10—-13-jointed. Gnathopod 1, 6th joint piri- ee, form, very broad at base, hind margin much [After B. Dybowsky.) shorter than the very oblique but well defined palm. Gmnathopod 2, 5tk and 6tk joints longer and more slender than in gnathopod 1, 6tk joint oblong, but gradually widening to the ‘oblique palm, which is shorter than hind margin. Peraeopods 3—5, 24 joint with convex hind margin but narrowed near the distal end, where it forms a free angle. Uropods 1 and 2 reaching the second third of uropod 3. Uropod 3, outer ramus about twice as long as inner, 24 joint distinet. Colour more or less yellowish white. L. 28 mm. Lake Baikal. Depth 300- 1300 m. 2. O. flavus (Dyb.) 1874 Gammarus f., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.72 t.9 £.1 | 1899 Ommatogammarus f., T. Stebbing in: Tr. Linn, Soe. London, ser.2 v.7 p.427 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Dorsal spines very delicate, on pleon segments 4 and 5 in 4 little groups, on segment 6 only in 2, spines in a group varying between 1 and 3. Head bent at right angles as in O. albinus, but the connecting curve larger. Pleon segments 2 and 3, postero-lateral corners acutely produced. Eyes very large, oceupying nearly half the surface of head and nearly meeting at top, front margin closely adjoining upright front of head, hind margin divided into small rounded lobes, lower straight or alittle concave, black or, in specimens from a great depth, reddish. Antenna 1 about '/, as long as body, in GC less, in © more, than twice as long as antenna 2, pedunele shorter than peduncle of antenna 2 (or in O sometimes a little longer), flagellum 3 or 4 times as long as peduncle, 35—43-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 13—19-jointed. Gnathopod1, 6'h joint described as slenderly piriform, but rather oblong, the hind margin being considerably longer than the oblique, very concave palm, which is armed with a strong spine at the centre. Gnathopod 2, 5% joint rather longer than in gnathopod 1, 6% oblong, considerably shorter but nearly as broad as in gnathopod 1, hind margin slightly indented near the short, concave, nearly transverse palm. Peraeopods 3—5, 24 joint narrower than in O.albinus, i € . : 1. R » 456 Ommatogammarus, Odontogammarus the hind margin at the narrowed distal end not forming a free angle. Uropod 1 reaching end of inner ramus of uropod 3. Uropod 3, outer ramus broad, about twice as long as the narrow inner one, 24 joint indistinet. Colour yellow to clear honey-yellow. L. 30 mm. Lake Baikal. Depth 100—1300 m. 3. O. carneolus (Dyb.) 1874 Gammarus c., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.73 | 1899 Ommatogammarus c., 'T. Stebbing in: Tr. Linn. Soe. London, ser. 2 0.7 p.427 | 1893 Gammarus flwiatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Dorsal spines of pleon segments 4—6 arranged as in O. amethystinus. Eyes large, unique in form, like the capital letter B reversed, with 2 great lobes in front, the hinder and lower margins being also broken up into lobes, ruby-red. Antenna 1 more than '/, as long as body, nearly twice as long as antenna 2, peduncle shorter than peduncle of antenna 2, flagetlum 3 or 4 times as long as pedunele, 31 —45-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, flagellum 11—15-jointed, peduncle and flagellum elosely beset with simple setae, which are sometimes longer than the flagellum itself. Gnathopod 1, 6th joint slender, piriform; gnathopod 2, 6tk joint oblong; in both gnatho- pods pretty closely covered with setae often exceeding the length of the joint. Uropod 1 not reaching the middle of uropod 3. Uropod-3, outer ramus about twice as long as inner. Colour flesh-red, variable in intensity. L. 18 mm. Lake Baikal. Depth 300—700 m. 4. O. amethystinus (Dyb.) 1874 Gammarus a., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.74 t.9 £.6 | 1899 Ommatogammarus a., T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.427 | 1898 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 927. Dorsal spines very delicate, 1 or 2 on the obsceure elevations of the hind margins of pleon segments 4 and 5, corresponding to middle and lateral groups, segment 6 having only 2 spinules. Dorsal line of head slightly convex, rostral point depressed. Eyes small, narrow, hind margin broken up into lobes, reddish or bright rose-red to whitish red. Antenna 1 ?/,—?/, aslong as body, nearly twice as long as antenna 2, peduncle shorter than peduncle of antenna 2, flagellum 3 or 4 times as long as peduncle, 35 —62-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 12—16-jointed. Gnathopod 1, 6t% joint slenderly. piriform, the concave palm forming a sinuous line with the hind margin. Gnathopod 2, 5th joint decidedly longer than that of gnathopod 1, 6" evenly oblong, shorter than that of gnathopod 1, but scarcely narrower than its widest part. Peraeo- pods 3—5, 24 joint with convex hind margin produced below to a rather long obtusely ending process. Uropod 1 reaching middle of uropod 3. Uropod 3, outer ramus about twice as long as inner, its 24 joint distinet. Colour amethystine to bluish red. L. 24 mm. Lake Baikal. Depth 500—1300 m. 42. Gen. Odontogammarus Stebb. 1899 Odontogammarus, T. Stebbing in: Tr. Linn. Soe. London, ser. 2 0.7 p.427. In general like Gammarus (p. 460). Lower front angle of side-plate 5 forming a tooth. Peduncle of antenna 1 not shorter than peduncle of antenna 2, 34 joint as long as 24, Gmathopod 1, 6" joint not smaller than that of 4, Du = Ed nn en un TEE TEREIRL ANREGEN j En # . : F . ‚4 bi 3 a & h h # = 3 3 ae REN as Dana aaa Zn 2 u alien li nt. Odontogammarus 457 gnathopod 2. Peraeopods 3—5, 24 joint produced at lower hind angle into a tooth. Uropod 3 not very long, the 2-jointed outer ramus (as in Gammarus) longer than the inner. 2 species. Synopsis of: species: In side-plate 5 the tooth bent slightly outward. . . . 1. O.calcaratus. . . p.457 In side-plate 5 the tooth direeted straight downward . 2. O. margaritaceus . p. 457 1. O. calcaratus (Dyb.) 1874 Gammarus ce., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.54 t.7 f.4 | 1893 @. ce. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.759 | 1899 Odontogammarus c., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 427. Pleon segments 4 and 5 each with 3 little groups of dorsal spines on hind margin, segment 6 with 2 little groups, 2 or 3 spines to a group. Side-plate 5 in front half produced far down in a tooth-like angle, bent slightly outward from the body, the hind angle little prominent so that to the rear the lower margin forms almost a straight line; side-plate 6 in front half produced over 24 joint of peraeopod 4, slightly pointed, not forming a tooth; side-plate 7 rounded in front. Eyes small, reniform, black. Antenna 1 rather more than '/, as long as body and twice as long as antenna 2, peduncle as long as or a little longer than pedunele of antenna 2, 1° joint scarcely longer and 2% perhaps a little shorter than 34, flagellum twice as long as peduncle, 45—62-jointed, accessory flagellum 8—10-jointed. Antenna 2, ultimate joint of pedunele longer than penultimate, flagellum shorter than peduncle, 22-jointed, with calceoli in d. Characters of gnathopods 1 and 2, 6% joint differing in text and figure. Peraeopods 3 and 4, 24 joint with front margin very convex, much more so than in peraeopod 5, in all the hind. margin is slightly concave, ending below with a long tooth-like angle, reaching far over the 34 joint (wanting in young from the brood pouch). Uropod 1 reaching nearly to the middle of uropod 3. Uropod 3, 24 joint of outer ramus about '/, of 1° joint, inner ramus °/, as long as outer, both with plumose setae on both margins. Colour dorsally greenish yellow, iridescent, on sides dark yellow, here also nacreous. L. 36 mm (including '6 mm for uropod 3). Lake Baikal. Depth 50—100 m. 2. O. margaritaceus (Dyb.) 1874 Gammarus m., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.21,56 | 1899 Odontogammarus m., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.427 | 1893 Gammarus calcaratus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Like O. cealcaratus, but head more convex and in front more obtuse; side-plate 5 deeper, with front and hind angles nearly equally long, running out into triangular pointed lappets, of which the front one is somewhat the sharper and longer; side-plate 6, with front corner rounded, hind one produced acutely downward. Eyes irregularly linear-reniform, with broken hind margin, wbite, scarcely or notat all visible in spirit. Antenna 1, flagellum 53—63-jointed, accessory Hagellum 7-jointed; antenna 2, flagellum 19—-27-jointed. Peraeo- pods 3—5, 24 joint broader, with hind corner more weakly developed. Uropod 3 shorter, but inner ramus relatively longer, outer margin of outer ramus without plumose setae and its 24 joint diminutive. Colour bright yellowish playing into bluish. Lake Baikal. Depth 150—1000 m., ER a ae ee eb ir u RL TE SR 458 Dikerogammarus 43. Gen. Dikerogammarus Stebb. 1899 Dikerogammarus, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 428. Agreeing in general with Gammarus (p. 460). Pleon segments 4 and 5 each raised dorsally to a spiniferous tuberele. Antenna 1 the longer, accessory flagellum well developed. Gnathopods 1 and 2 larger in S than in oO, 24 larger than 1%, 5 species. Synopsis of speeies: 1 Uropod 3, rami very unequal — 2. Uropod 3, rami not very unequal — 4. Head arched longitudinally . . ».. 2.2.2... 1. D. macrocephalus . p. 458 Head not arched longitudinally — 8. 8 2! Peraeopods 3—5, 2d joint not very broadly ex- nn RE a Re 8. D. erimm# . . 5 °.)% p- 459 Gnathopod 2 much larger than gnathopod 1 . 4. D. verreauxi . . . p.459 Gnathopod 2 not much larger than gnathopod 1 5. D. fasciatus. . . . .p.460 Peraeopods 3—5, 2d joint broadly expanded . ED haemobaphes. . p. 458 4} \ 1. D. macrocephalus (O. Sars) 1896 Gammarus m., G. O. Sars in: Bull. Ace. St.-Pötersb., ser.d v.4 p.453 t.7 f.1—11 | 1899 Dikerogammarus m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 428. a Body robust, back smoothly rounded, except pleon segments 4 and 5, tuberele of pleon segment 4 tipped with 4, of segment 5 with 2 spines; segment 4 without lateral spines, segment 5 left doubtful, segment 6 with 2 on each side at base of telson. Head large, dorsal surface strongly vaulted, with peculiar areolated appearance from points of insertion of strong muscles eonverging to the mouth area. Side-plates not particularly large. Pleon segment 1, postero-lateral corners rounded, in segments 2 and 3 acutely produced. Eyes very small, distinctly reniform. Antenna 1 slender, not half as long as body, 1% joint as long as 24 and 34 combined, flagellum about 27-jointed, accessory flagellum 6-jointed. Antenna 2 stronger, rather setose, flagellum 10-jointed. Gnathopods 1 and 2, 6% joint oblong oval, in gnathopod 2 (at least in J) fully twice as large as in gnathopod 1, in both palm oblique, well defined, rather shorter than hind margin. Peraeo- pods 1—5 .rather slender, not very long. Peraeopods 3 and 4, 24 joint wider above than below, hind margin sinuous. Peraeopod 5, 24 joint much larger, broadly oval, hind expansion produced below to an obtusely pointed lobe. Uropods 1 and 2, rami subequal, not long, with apieal groups of spines, and here and there a lateral spine. Uropod 3 reaching far beyond the others, peduncle short, outer ramus long, sublinear, fringed densely all round with slender setae, and having 3 groups of spines on each margin, 24 joint minute; inner ramus little over */;, as long as peduncle. Telson broader than long, each lobe having 3 spinules on narrowly truncate apex L. © 24 mm. Caspian Sea. Depth 66 m. 2. D. haemobaphes (Eichw.) ?1771 Oniscus pulex, Cancer p. (err., non Linne 1758!), Pallas, Reise Ruß., v.1 p.477 | 1841 Gammarus haemobaphes, Eichwald in: N. Me&m. Soc. Moseou, ©.7 p.230 t. 87 £.7a—c | 1899 Dikerogammarus h., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.428 | 1894 Gammarus h. + G. robustoides (@. aralo- EEE er - Dikerogammarus 459 caspius ©. Grimm in MS.), @. ©. Sars in: Bull. Ae. St.-Pötersb., ser.5 ©o.1 p.215 t.8; p.358 1.12 | 1862 @. caspius (non Oniscus e. Pallas 1771!), Bate, Cat. Amphip. Brit. Mus,, p. 214 t.38 f.3 | 1875 @. aralensis, Uljanin in: Fedtschenko, Turkestan, Crust. p.1t.5£15. Very like D. macrocephalus, differing in the following points. Pleon segments 4 and 5, dorsal conical tuberele rather smaller, each with 2 apical spines, segment 4 with a spinule also on each side. Head normal. Pleon segment 3, postero-lateral eorners rather quadrate than acutely produced. Eyes well developed. Antenna 1, accessory flagellum 7—9-jointed. Antenna 2, flagellum about 8-jointed. - Peraeopods 3—-5 rather stout. Peraeopod 3, . 24 joint broader above than below, but nearly quadrangular, lower hind angle slightly produced. Peraeopod 4, 24 joint much more expanded above than below. Uropod 3, outer ramus with 1 group of spines on inner margin, the small inner ramus more than half as long as the short peduncle. Telson with only 1 or 2 apical spines on the very narrow apex of each lobe. Colour brownish green, hind margins of segments laterally tinged with pink; eyes dark. L. 9—16 mm. Black Sea; Caspian Sea (shore to 75 m). 3. D. grimmi (O0. Sars) 1896 Gammarus g., G. O.Sars in: Bull. Ac. St.-Petersb., ser.d v.4 p.448 t.6 f.1—10 | 1899 Dikerogammarus g., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 428. Very like D. haemobaphes. Body rather slender. Pleon segments 4 and 5, tuberele very prominent, narrow, on segment 4 tipped with 4 spines and flanked by 2 unequal spines on each side, on segment 5 tipped with only 2 spines, segment 6 carrying 3 spines on each side. Pleon segment 3, postero-lateral corners acutely produced. Eyes oblong oval, scarcely reniform, - usually dark, but variable. Antenna 1, accessory flagellum 7-jointed. Gnathopods 1 and 2 still more unequal in J than in ©, gnathopod 2 in JS very large, 6! joint very tumid at the base. Peraeopods 1—5 rather slender, 24 joint in peraeopodgs 3—5 conspicuously narrower than in D. haemobaphes, in peraeopod 5 this joint becoming oblong quadrangular, with nearly straight, much serrate hind margin, produced to a narrowly rounded lobe. Uropod 3, outer ramus very long and narrow, fringed with setae, but without conspicuous spines; inner ramus about half as long as peduncle, almost spine-like in narrowness. Telson with 2 spinules on each obtusely pointed apex. L. C 27 mm. Caspian Sea. Depth 66—203 m. 4. D. verreauxii (Bate) 1862 Gammarus v., @. verrauxü, (H. Milne Edwards in MS.?) Bate, Cat. Amphip. Brit. Mus., p.210 t.37 f.5 | 1899 Dikerogammarus verreauxü, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.428-+ 1895 Gammarus locusta (part.)?, A. Della Valle in: F. Fl. Neapel, ©.20 p. 768. Pleon segments 4 and 5 with dorsal tubercles (without spines in figure). Eyes ovate. Antenna 1 about '/, as long as body, flagellum shorter than pedunele. Antenna 2 shorter, peduncle not longer than in antenna 1. Gnathopod 2 twice as long’ as gnathopod 1, 6tk joint long ovate, tapering, palm the entire length of the inferior margin, straight, finger (im figure) very long. Peraeopods 3—5 not very unequal, 24 joint not much dilated, narrowed below (in figure). Uropod 2 considerably shorter than uropod 1, uropod 3 a little longer (reaching a little further?) than uropod 1, rami equal. L. 37 mm. New Holland. 460 Dikerogammarus, Gammarus 5. D. fasciatus (Say) 1818 Gammarus f., Say in: J. Ac. Philad., ve. 1ır p. 874 | 1830 @. f., H. Milne Edwards in: Ann. Sci. nat., v.20 p. 367 | ?1862 @. f., Bate, Cat. Amphip. Brit. Mus., p. 210 t.37 f.6 | 1874 @. f., 8S.I. Smith in: Rep. U. S. Fish Comm., v.2 p.653 | 1899 Dikerogammarus f., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 0.7 p. 428. Pleon segments 4 and 5 slightly angulated dorsally at hind margin, each armed with 3 fascieles of spines, the median raised on a distinet protu- berance, segment 6 also with 3 fascieles.. Antenna 1, 2% joint surrounded with long setae, which reach the 5tk joint of flagellum, accessory flagellum 5- or 6-jointed. Antenna 2 setose. Gmnathopod 1 in JS, 6tk joint much narrowed distally, palm very oblique, defined from the spineless hind margin by small spines, and having a stout spine at the middle, in Q only slightly narrowed distally, palm less oblique. Gnathopod 2 in JS, 5tk joint rather longer than in gnathopod 1, 6! with margins nearly parallel, but widening a little to the palm, which is a little oblique, slightly concave, with a lamellar edge, carrying a stout spine near the middle, and defined by groups of small spines; in 9 5*k joint proportionally longer, as wide as the narrow, parallel- sided 6!4, which has a short, nearly transverse palm. Uropod 3, inner ramus usually with 1 or 2 spines on the inner margin. Telson, each lobe with a spine and 1 or 2 hairs on outer margin as well as a ı few spines and hairs at the apex. L. 10—15 mm. Northern United States of America. Streams and ponds. 44. Gen. Gammarus F. 1758 Cancer (part.), Linne, Syst. Nat., ed. 10 p.625 | 1775 Gammarus (part.), J. C. Fabrieius, Syst. Ent., p.418 | 1813/14 @., Leach in: Edinb. Ene., 0.7 p.402, 482 | 1862 @., Bate, Cat. Amphip. Brit. Mus., p. 203 | 1874 @. (part.), B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.19 | 1876 @., A. Boeck, Skand. Arkt. Amphip., «.2 p. 364 | 1886 G., Gerstaecker in: Bronn’s Kl. Ordn., v.5rı p.5ll | 1888 @., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1005, 1673 | 1893 @., A. Della Valle in: F. Fl. Neapel, v.20 p.756 ! 1894 @., G. O. Sars, Crust. Norway, v.1 p.496 | 1793 [Subgen.]) Gammarellus (part.), J. F. W. Herbst, Naturg. Krabben Krebse, v.2 p. 106. Body without carinae, teeth or tubereles; dorsal spinules generally in median and lateral groups on pleon segments 4—6, but sometimes wanting on 4*h or on both 4tk and 5t". Head without conspieuous rostrum. Side-plates 1—4 usually rather deep. Eyespresent. Antenna 1 almost always longer than antenna 2, though with shorter pedunele, accessory flagellum almost always with more than one joint. Antenna 2, flagellum not- or little longer than peduncle. Upper lip as broad as deep, faintly emarginate at apex. Lower lip without inner lobes. Mandible normal. Maxilla1 (Fig.87 p.476), inner plate with several setae, outer with (11?) more or less serrate spines, 24 joint of palp with spine-teeth on the apex of one maxilla and slender spines on the other. Maxillipeds normal. Gnathopods 1 and 2 subchelate, stronger in J than in Q, gnathopod 2 usually the larger, in the JS often much the larger. Peraeopods 3—5, 24 joint variable, much or little expanded. Branchial 'vesicles simple, with narrow attachment. Uropod 3, outer ramus usually long and having a small 24 joint. Telson cleft, usually to the base. 30 accepted species, 1 doubtful. Synopsis of accepted species: Antenna 1, accessory flagellum of more joints | Antenna 1, accessory flagellum of only one joint 1. G.guernei. . . - - p. 462 1 than one — 2. ee BI U u un a. ft na Be Ze idee‘ ? - r nr . ; . Gammarus Antenna 1 shorter than antenna 2 — 3. 2. Antenna 1 not shorter than antenna 2 — 5. Antenna 2, ultimate joint of pedunele shorter than penultimate- . .. 2... 020... Antenna 2, ultimate joint of peduncle longer than penultimate — 4. Gnathopod 2, 6th joint narrow, subeylindric . * Gnathopod 2, 6thjointnot narrow, subrectangular Pleon segment 4 without dorsal spinules --- 6. B Pleon segment 4 with dorsal spinules — 16. Pleon segment 5 without dorsal spinules — 7. Pleon segment 5 with dorsal spinules — 14. [e2) Uropod3, outer ramus little longer than pedunele Uropod 3, outer ramus much longer than peduncle — 8. h Uropod 3, inner ramus less than half as long as outer — 9. Uropod 3, inner ramus fully half as long as outer — 13. | | | | | | | Uropod 3, outer ramus with rather large | | | | | & 9 2d joint — 10. Uropod 3, outerramus with very small 2d joint —1 | Uropod 3, inner ramus scarcely !/ of outer . 2 Uropod 3, inner ramus nearly !/s of outer. Peraeopods with very few setae ..... - 41 Peraeopods with numerous setae — 12. Pleon segments 4 and 5 dorsally upraised, EN TER RE Pleon segments 4 and 5 not dorsally upraised er Er Sr 12 Mandibular palp of normal size... .... 18 Mandibular palp abnormally large . ... . “ Peraeopod 5, 24 joint produced behind 34 Peraeopod 5, 2d joint broad, abruptly contracted a a re EL N a Peraeopod 5, 2d joint not broad, not abruptly a EA NR 15 Pleon segments 2 and 3, postero- See corners obliquely truneate . .’. 2.22... Pleon segments 2 and 3, postero-lateral eorners not truncate — 17. Uropod 3, inner ramus less than half as long as outer — 18. Uropod 3, inner ramus not less than half as long as outer — 24. 17 18 { Uropod 3, outer ramus remarkably long — 19. Uropod3, outer ramus not remarkably long — 21. ee NEE Gnathopod 1, 6th joint not much broader than | Gnathopod 1, 6th joint much broader than that that of gnathopod 2 — 20. 461 2. G. abbreviatus.. . . p.462 3. G. annulatus. . . . p.463 4. G.natator . . . .. p- 463 2... 0B6BUB 2. p- 464 % 6. G. macrurus . . . . p.464 7. G. compressus . . . P. 8. G. subnudus. . p 9. G. deminutus . . . p.466 10. G. similis . -. . - . p.466 1l. G. weidemanni. . . p. 467 12. G. maeotieus. . . . p.467 G. erassus . . . . » p.467 . 13. Peraeopod 5, 24 joint not produced behind 3d — 15. 17, . G. warpachowskyi . p. 468 . G. pauxillus . . . . p.469 . G.kietlinski . . . p.469 G. andrussowi.. . + p.469 462 Gammarus 90 Byes short, avaliin)e ar a 18. G.ischnus. . . . . p.470 Eyes long, retort-shaped. .. .». 2:2...» 19. G. plaeidus . . . . p.470 Gnathopod 2, 6th joint greatly expanded distally 20. G. platycheir. . . . p.471 21 Gnathopod 2, 6th joint not greatly expanded distally — 22. Antenna 1, 1st joint not as long as 2d and 3d 09 Bombinad 2a Eee 21. G.pungens. . .. . p. 471 Antenna 1, 1st joint as long as 24 and 3d combined — 28, 08 Pleon segments 4—6, dorsal spinules numerous 22. G. marinus. ... . p.472 Pleon segments 4—6, dorsal spinules few . . 23. G.simoni . ... . p- 473 04 Pleon segments 4—6 dorsally hairy. . . . . 24. G. duebenii . . . . p.473 Pleon segments 4—6 not dorsally hairy — 25. Antenna 1, accessory flagellum with not more 98 than 4 joints — 26. Antenna 1, accessory flagellum with more than 4 joints — 29. Peraeopod 5, 24 joint with lower hind corner 96 ee 1 TE 25. G. Dülez . . ,.,.... p- 474 Peraeopod 5, 2d joint with lower hind corner not rounded — 27. Uropod3, inner ramus only half as long as outer 26. G. delebecquei.. . . p.475 27 | Uropod 3, inner ramus much more than half as long as outer — 28. Gnathopod 1, 6th joint rather longer than that 08 DERUSEROWBR BE en ”., . 27. G. hyaeinthinus p- 475 Gnathopod 1, 6th joint not longer than that of BE RER a 28. G. syriacus p- 475 09 Eyes reniform. ....:... Bas 29. @.locusta .... . p. 476 es Eyes constrieted in the middle... .. .. 30. G. camylops p: 476 1. G. guernei Chevreux 1889 @.g., Chevreux in: Bull, Soc. zool. France, v. 14 p.294 f. | 1893 @. pungens (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.764. In form resembling G. pulex (p. 474). Pleon segments 4—6 with small dorsal fascicles of spines, 6 spines on segment 4, 8 on segment 5, 2 on segment 6. Head (in figure) with lateral angles scarcely at all prominent. Side-plates 1—4 rather deep. Pleon segments 1—3, postero-lateral angles acute. Eyes small, reniform. Antenna 1 not quite half as long as body, pedunele not long, 24 joint rather shorter than 1°, and 39 than 24, flagellum quite smooth, 19-jointed, accessory flagellum 1-jointed. Antenna 2 considerably shorter, flagellum without setae, 9-jointed. Gnathopods 1 and 2 similar, but 5th and 6th joints longer in gnathopod 2, 6tk joint oblong, palm well defined, short, a little oblique. Peraeopod 1, 4tk joint long and wide, strongly setose on hind margin, 5tk joint much narrower and shorter, likewise setose. Peraeopod 2 shorter and slighter, not setose. Peraeopods 3—5 rather long, 24 joint well expanded, oval. Uropod 3 reaching far beyond the others, outer ramus very long, with small 24 joint, inner ramus rudimentary, oval. Telson very short, each broadly oval lobe having a fasciele of spines at middle of outer margin, and another of 5 spines at apex. L. 6 mm. Azores (Flores). Torrents. 2. G. abbreviatus O. Sars 1894 @.a., G.O.Sars in: Bull. Ae. St.-Pötersb., ser.5 v.1 p. 365. a ee Ir Ei = BY Br B. x = u D . Gammarus 468: Body rather short and stout, pleon segment 4 smooth, segments 5 and 6 each with 1 or 2 very small dorsal spinules. Head, lateral lobes slightly prominent, evenly rounded. Side-plates 1—4 distally conspieuously erenulate and setose, 1% obliquely expanded below, 4{k very broad. Pleon segments 2 and 3, postero-lateral corners acute. Eyes oval reniform. Antenna 1 very short, not ?/, as long as body, 1° jointlarge, longer than 24 and 39 combined, flagellum about as long as pedunele, 9-jointed, accessory flagellum 4- or 5-jointed. Antenna 2 rather longer, setose, ultimate joint of peduncle shorter than penultimate, flagellum about 7-jointed. Gnathopods 1 and 2 in © similar, 24 slightly the larger, 6*% joint oblong oval, palm rather oblique, pretty well defined. Gnathopods 1 and 2 in J stronger, much more unequal, 6 joint in gnathopod 1 narrowing distally, palm more oblique, in gnathopod 2 much larger, oblong oval, with the usual spine in middle of palm. Peraeopods 1 and 2 strongly built, densely setose, 4 joint large and expanded. Peraeo- pods 3—5, 24 joint expanded, rounded quadrangular in peraeopod 3, expanded above, tapering below in peraeopod 4, much larger and regularly oval in peraeopod 5, produced downward behind in narrowly rounded lobe. Uropods 1 and 2 reaching beyond peduncle of uropod 3. Uropod 3 not very long, outer ramus densely setose, with small but obvious 24 joint, inner ramus. about as long as the short peduncle. Telson about as long as broad, each lobe with 3 apical spines, otherwise smooth. L. © 12, 0 13 mm. Caspian Sea. Among Zostera. 3. G. annulatus S.I. Sm. 1873 @..a., (S. 1. Smith in:) A. E. Verrill in: Rep. U.S. Fish Comm., v.1 p.557 | 1893 @. locusta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 760. Pleon segment 4 with median faseiele of 2 large and 2 small spines, segments 5 and 6 with lateral fascicles as well as median. Head, lateral lobes truncate, somewhat prominent. Eyes scarcely reniform, lower border remote from lateral lobes of head. Antenna 1 shorter than antenna 2. Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum slender, with rather elongate joints. Gnathopod 1, 6% joint rather elongated, palm very oblique. Gnathopod 2, 6! joint very narrow, elongated, sub- eylindrieal, slightly flattened on inner side, palm longitudinal, scarcely distinct from hind margin. Colour greyish white, hind margins of segments annulated with brown, red spots on some of the pleon segments. L. 12—18 mm. North-Atlantic (New Haven [Connectieut], and Eastport [Maine]). . Under stones, shore. 4. G. natator S.I.Sm. 1873 @.n., (S.I Smith in:) A.E. Verrill in: Rep. U. S. Fish Comm., v.1 p.558 | 1893 @. loeusta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 760. Pleon segment 4 with median faseicles of spines, segments 5 and 6 with median and lateral fascicles. Side-plates 1—3, lower margin setose. Pleon segments 2 and 3, postero-lateral angles acutely produced. Eyes large, long, slightly reniform. Antenna 1 shorter than antenna 2, setose, many of the setae plumose. Antenna 2 also setose, ultimate joint of pedunele longer than penultimate, flagellum about °/, length of peduncle. Gnathopod 1 in Ö more slender than gnathopod 2, 6% joint oval, palm continuous with hind margin, defined by 2 small spines, with stout spine in middle of laminar margin, finger strongly eurved. Gnathopod 2, 6% joint subreetangular, palm slightly oblique, armed as in gnathopod 1, but with notch for the stout spine. In © gnathopods 1 and 2 have 6! joint smaller and slenderer, somewhat oval, 464 Gammarus nearly alike in both gnathopods. Uropod 3, rami long, lanceolate, fringed with long plumose setae, outer with slender, almost spiniform 24 joint, ‘inner as long as 1° joint of outer. Telson, each lobe nearly thrice as long as broad. L. 10—12 mm. Vineyard Sound [United States of America]. At surface, usually among floating sea-weed. 5. G. obesus O.Sars 1894 @.o., G.O.Sars in: Bull. Ace. St.-Petersb., ser. 5 v.1 p. 368 t. 15. Body extremely short and stout, more so than in any other known Gammarus, dorsally smooth, except for a pair of very small spinules on pleon segment 6. Head, lateral lobes little prominent, evenly rounded. Side- plates 1—4 large and deep, distally fringed with setae, 1° rather broadly expanded distally, 4" not as broad as deep. Pleon segments 2 and 3, postero-lateral corners obtusely quadrate. Eyes oval, reniform, not large. Antenna 1 about '/, length of body, 1° joint large, longer than 24 and 34 combined, flagellum rather longer than peduncle, 15-jointed, accessory flagellum 2-jointed. Antenna 2 rather shorter, flagellum as long as ultimate and pen- ultimate joints of peduncle combined, 7-jointed. Gmnathopods 1 and 2, 6% joint oblong oval, palm well defined, not very oblique, more so in J than in ©, gnathopod 2 a little stronger than gnathopod 1, and both gnathopods rather stronger in J than in ©. Peraeopods 1—5 rather strong, densely setose, 5th joint short, finger strong. Peraeopods 3 and 4, 24 joint narrowing distally, so that the lower hind corner is not free. Peraeopod 5, 24 joint widely expanded, widened distally, with broadly rounded lobe. Uropods 1 and 2 with only apical spines. Uropod 3 unusually short and stout, reaching little beyond the others, outer ramus scarcely longer than peduncle, carrying plumose setae, 24 joint minute, inner ramus scale-like, with 1 apical spine, Telson much broader than long, each lobe having 1 spine and 2 setules on the narrowly truncated apex. L. © 8, d 9 mm. Caspian Sea. Shallow water. 6. G. macrurus O. Sars 1894 @. m., G. ©. Sars in: Bull. Ae. St.-Pötersb., ser. 5 v.1 p.350 t. 10 £. 17—27. Q. Body slender, dorsally smooth except for a pair of very small spinules on pleon segment 6. Head, lateral lobes broadly rounded, prominent. Side-plates 1—4 rather large, fringed with scattered setules; 1° a little expanded, 4 very large, as broad as deep. Pleon segments 2 and 3, postero- lateral corners produced to a rather obtuse point. Eyes not very large, oblong oval, dark. Antenna 1 scarcely more than '/, length of body, 1 joint large, nearly twice as long as 2% and 34 combined, flagellum about as long as pedunele, 6-jointed, accessory flagellum 3-jointed. Antenna 2 a little shorter, antepenultimate joint of pedunele wide, projecting, ultimate joint shorter than penultimate, flagellum 4-jointed. Gmathopods 1 and 2 small and feeble, 6' joint subequal to 5tk in length and scarcely broader, these 2 joints being rather longer, but not wider, in gnathopod 2 than in gnatho- pod 1. Peraeopods 1 and 2, 4th joint rather expanded, this and the 5th setose. Peraeopod 3, 24 joint rounded quadrangular. Peraeopod 4, 24 joint narrower and scarcely longer, narrowed close to distal end. Peraeopod 5, 24 joint much larger, oval, hinder expansion produced downward in a broadly rounded lobe. Uropods 1 and 2, rami equal, narrow. Uropod 3 long, Gammarus 465 reaching much beyond the others, outer ramus long, with setae on inner margin, its 24 joint fully half as long as 1° and as long as the pedunele, "inner ramus shorter than peduncle, tipped with 2 spines. Telson much Re. longer than broad, tapering, each narrow lobe having 1 lateral and 1 apical spinule. L. 6 mm. — J not known. Caspian Sea. 7. G. compressus O.Sars 1894 @.c., G.O. Sars in: Bull. Ace. St.-Pötersb., ser.5 v.1 p. 353 t. 11 £.1—10. Q. Body slender, much eompressed, dorsally smooth except for pair ' of minute spinules on pleon segment 6. Head without rostrum, lateral lobes narrowly rounded, little prominent. Side-plates 1—4 large, setulose, . 1°t widely expanded forward, 4 as broad as deep. Pleon segments 2 and 3, postero-lateral corners subquadrate. Eyes not large, narrowly oblong, dark. Antenna 1 scarcely more than '/, as long as body, 1° joint massive, longer than 22 and 34 combined, flagellum subequal to pedunele, 9-jointed, accessory fagellum 3-jointed. Antenna 2 subequal to antenna 1, ultimate joint of pedunele shorter than penultimate, flagellum subequal to peduncle, 6-jointed. Gnatho- pods 1 and 2 rather small and feeble, palm short and nearly transverse, 5!" and 6 joints rather narrower and longer in gnathopod 2 than in gnathopod 1. Peraeopods 1 and 2 strongly built, especially peraeopod 2, 4" joint large, expanded, 5tl oval, both densely fringed with setae on hind margin. Peraeo- pods 3—5 subequal in length, 4% joint rather broad, 24 joint rounded oval in peraeopod 3, narrower in peraeopod 4, with very sinuous hind margin, much larger and oval in peraeopod 5, ending in a produced, rounded lobe. Uropods 1 and 2, rami subequal, narrow, with spines only at apex. Uropod 3 of moderate size, reaching beyond the others, outer ramus about twice as long as peduncle, 24 joint about half as long as 1°, inner ramus nearly half as long as outer, tapering, tipped with a spine and 2 or 3 setules. Telson fully as long as broad, lobes gradually diverging, each with 2 spines at the somewhat truncated apex. L. 7” mm. — © unknown. Caspian Sea. 8. G. subnudus O.Sars 1896 @.s., G. O. Sars in: Bull. Ace. St.-Pötersb., ser. 5 ©.& p.451 t.6 f. 11-19. O0. Back broadly rounded, dorsally smooth except for a few small hairs at end of pleon segments 4—6. Head, lateral lobes broad, obliquely truncated, lower corner the more prominent. Side-plates 1—4 large, not setose, 1° not expanded distally, 4 broad. Pleon segments 2 and 3, postero-lateral corners quadrate. Eyes of medium size, oblong oval, dark, Antenna 1 scarcely more than /, as long as body, 1° joint scarcely as long as 24 and 34 combined, flagellum subequal to pedunele, 16-jointed, accessory flagellum 3-jointed. Antenna 2 a little shorter, flagellum shorter than ultimate and penultimate joints of peduncle. Gmnathopod 1, 5th joint short, 6th oblong oval, palm rather oblique, defining angle obtuse. Gnathopod 2 similar in shape, but 6" joint more than twice as large as in gnathopod }. Peraeopods 1—5 not very slender, very scantily furnished with spines and setae, 24 joint in peraeopod 3 rounded quadrangular, in peraeopod 4 gradually but greatly narrowing distally so as to have no free corner, in peraeopod 5 large, oval, with rounded lobe much produced downward. Uropod 3 of f moderate size, but reaching much beyond the others, outer ramus broad, = about twice as long as peduncle, fringed with setae, 24 joint small but distinct, \ Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 30 466 Gammarus inner ramus very small, scale-like. Telson broader than long, the lobes each narrowing to a bluntaapex, tipped with a spine and setule. L.8 mm. — C unknown. Caspian Sea’ (Bay of Baku). Depth 4—11 m. 9. G. deminutus Stebb.*) 1894 G. minutus (non @. pulex m. P. Gervais 1835!), G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.1 p.347 t. 10 f. 1—26. Body rather short and stout. Pleon segments 4 and 5 dorsally strongly convex, gibbous, 4!" partly overlapping 5t" dorsally, each with a very small fasciele of hairs, segment 6 with a pair of spinules. Head, lateral lobes broadly rounded, rather prominent. Side-plates I—4 deep, but less so in Ö than in 9, setose, 1° slightly expanded, 4" not nearly as broad-as deep. Pleon segments 2 and 3, postero-lateral corners acutely quadrate. Eyes not large, oblong oval, dark. Antenna 1 little more than '/, as long as body, 1° joint large, nearly twice as long as 24 and 34 combined, flagellum subequal to pedunele, 8-jointed, accessory flagellum 3-jointed. Antenna 2 a little shorter, antepenultimate joint of peduncle thick, distally projeeting, ultimate joint shorter than penultimate, flagellum about half as long as peduncle, 4-jointed. Gnathopods 1 and 2 in © small, subequal, 6% joint oval quadrangular, palm short, almost transverse. Gnathopods 1 and 2 in J stronger, more unequal, 6! joint in gnathopod 1 much narrower and with palm more oblique than in gnathopod 2. Peraeopods 1 and 2, 4tk joint rather large, this and 5th strongly setose on hind margin. Peraeopods 3—5 little differing in length, 24 joint in peraeopod 3 subquadrate, lower hind ‘corner nearly rectangular, in peraeopod 4 much narrower, somewhat expanded above, with no free corner below, hind margin sinuous, in peraeopod 5 unusually large, front margin little convex, hind margin extremely so, with broadly rounded lobe produced downward. Uropods 1 and 2, rami with apieal spines only. Uropod 3 of moderate size, reaching beyond the others, peduncle short, outer ramus narrow, with 1 fasciele of spines near middle of outer margin, others at apex of 1° joint, 24 joint very small, tipped with 3 'setules, inner ramus very small, with 1 apieal spinule. Telson with divergent lobes, each having 2 small spinules on the obtuse apex. L. © 4, d 5 mm. Caspian Sea. 10. G. similis O. Sars 1894 @. s., G. O. Sars in: Bull. Ac. St.-Pötersb., ser. 5 v.1 p.355 t. 11 f. 11-20. Very like G. compressus (p. 465), less compressed, back broad, smooth, except for 2 minute spinules on pleon segment 6. Head, lateral lobes obtusely rounded, prominent. Side-plates 1—4 setose, 1° scarcely expanded, 4th deeper than broad. Pleon segments 2 and 3, postero-lateral corners subquadrate. Eyes of moderate size, oblong reniform. Antennae 1 and 2 equal, scarcely more thaı '/, as long as body. Antenna 1, 1° joint large, nearly twice as long as 24 and 34 combined, flagellum rather longer than pedunele, 11-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, flagellum nearly as long as peduncle, 7-jointed. Gnathopods 1 and 2 in © small, 6 joint oblong, palm little oblique, St" and 6tk joints longer and narrower in gnathopod 2 than in gnathopod 1. Gnathopods 1 and 2 ind more powerful, palm more oblique, St and 6! joints little longer but much broader in gnathopod 2 than in gnathopod 1. Peraeopod 5, 24 joint compara- tively larger and more expanded than in G. compressus. Uropod 3 extending much beyond the others, outer ramus long, setose on inner margin, :24 joint *) Nom. nov. Zn a ee EA a BE EEE Fa Necto NER ; NEE En at Gammarus 467 ‘small, inner ramus scarcely '/, as long as outer, about as long as the short pedunele. Telson rather broader than long, lobes divergent, each with 2 spinules on rounded apex. L. 9 mm. Caspian Sea. From stones on shore, and among Zostera. 11. G. weidemanni 0. Sars 1896 G. w., G. ©. Sars in: Bull. Ac. St.-Pstersb., ser.5 v.4 p.462 t.9 f. 1-11. ne: Body rather robust, back broadly rounded, smooth except for 2 pairs ' of minute spinules on pleon segment 6. Head, lateral lobes obliquely rounded, ‚ upper corner the more prominent. Side-plates 1—4 setose, 1° rather expanded, 24 a little narrowed distally, 4b as broad as deep. Pleon segments 2 and 3, postero-lateral corners acutely quadrate. Eyes of moderate size, oval reniform, dark. Antennae 1 and 2 equal, about '/, aslong as body. Antenna 1, 1° joint massive, longer than 29 and 3% combined, flagellum longer than peduncle, 16-jointed, accessory flagellum 5-jointed. Antenna 2, antepenultimate joint ef pedunele projecting, ultimate joint shorter than penultimate, flagellum as long as these two combined, 8-jointed. Mandibular palp about as long as the trunk, setose, 34 joint curved, narrowly truneate at apex. Gmathopods 1 and 2, 5th joint short, 6% rectangular, palm rather oblique; rather strong in ©, but stronger in S, in both sexes gnathopod 2 larger than gnathopod 1, but similar in shape. Peraeopods 1 and 2, 4 joint large, especially in peraeopod 2, both long and broad, 5 joint short and broad, both densely setose. Peraeo- pods 3—5 rather stout, spinose, 29 joint in peraeopod 3 rounded quadrangular, with rounded lobe produced downward, in peraeopod 4 a little longer, upper part wider, but narrowed "elow, leaving no free corner, in peraeopod 5 much larger, hind margin evenly convex, produced downward in broadly rounded lobe. Uropod 3 reaching much beyond the others, outer ramus about twice as long as peduncle, broad, fringed with setae, 24 joint minute, inner ramus longer than peduncle, more than half as long as outer, with setae and 2 spines on inner margin. Telson scarcely longer than broad, lobes tapering, divergent. each with 3 spines on blunt apex. L. G 11 mm. Caspian Sea (Bay Karabugas). On sandy bottom near shore. 12. G. maeoticus Sowinski 1894 G. m., Sowinski in: M&m. Soe. Kiew, v.13 (p-6) t.1A, 2 | 1896 G.m., G. O. Sars in: Bull. Ac, St.-Petersb., ser.5 v.4 p. 465 t.9 f. 12— 20. : In many respeets agreeing with G. weidemanni, but some of the 3 differences are striking. Head, lateral lobes narrowly rounded, prominent. - $ide-plate 1 not at all expanded distally. Pleon segments 2 and 3, postero- lateral corners simply, not acutely, quadrate. Eyes rather small, decidedly reniform. Antennae 1 and 2 subequal, stout, '/, as long as body. Antenna 1, flagellum rather shorter than pedunele, 8- or 9-jointed, accessory flagellum 5-jointed. Antepenultimate and penultimate joints of peduncle distally widened, setose, ultimate joint also setose, scarcely shorter than penultimate, flagellum 6-jointed. Mandibular palp more than twice as long as the trunk, 3% joint as long as 24, both broad, setose. Gnathopods 1 and 2 in Q weak, subequal, in © much more powerful, unequal. Gnathopod 1 in Q', 6% joint narrowly > oblong. Gmathopod 2 in d, 6*h joint large and broad, oval quadrangular. er 2912 mm | Sea of Azov; Caspian Sea. Shallow water. 13. G. erassus 0. Sars 1894 @.c.(O. Grimm in MS.), G. O.Sars in: Bull. Ac. St.-Petersb., ser.5 v.1 p.362 t. 13. 30* N 2 er 468 Gammarus Body rather short and stout, back broadly rounded. Pleon segment 4 with dorsal fasciele of setules but no spines; segments 5 and 6 each with 2 dorsal groups containing 1 or 2 spinules a piece. Head, lateral lobes truncate, a little prominent. Side-plates 1—-4 with setules wide apart; side- plate 1 very little expanded, 4!" scarcely as broad as deep. Pleon segments 2 and 3, postero-lateral eorners acutely produced. Eyes oval reniform, dark. Antenna 1 less than '/, as long as body, 1°t joint large, fully as long as 24 and 34 combined, flagellum slender, longer than peduncle, 16-jointed, accessory flagellum 4-jointed. Antenna 2 a little shorter, ultimate joint of pedunele‘ shorter than penultimate, flagellum 8—11-jointed. Gnathopod 1 in 9, 6 joint oval, palm rather oblique, in gnathopod 2 rather larger, oblong, palm less oblique. Gnathopod 1 in ©, 6! joint narrowly oblong, palm sinuous, oblique, in gnatho- pod 2 nearly twice as large, broadly oblong, palm less sinuous, both gnathopods more powerful than in 2. Peraeopods 1 and 2, 4 joint rather large, 4% and 5th setose. Peraeopod 3, 24 jointrounded quadrangular. Peraeopod 4, 24 joint widely expanded, except distally, where there is scarcely a free corner. Peraeopod 5, 24 joint very large, hind margin serrate, evenly convex, the expansion much produced downward in a broad obtusely truncate lobe. Uropods 1 and 2, rami nearly equal, with apical spines, the inner also with 1 or 2 lateral spines. Uropod 3 reaching much beyond the others, outer ramus twice as long as peduncle, fringed with setae, 24 joint very small, inner ramus scale-like, little more than half as long as peduncle. Telson scarcely as long as broad, each obtuse apex having 2 spines and 2 setules. L. oO 11, S 12 mm. Caspian Sea. Shallow water to 202 m. 14. G. warpachowskyi O.Sars 1894 @.w., G.O.Sars in: Bull. Ace. St,-Petersb., ser.5 vo.1 p.343 t.9. Body rather slender and compressed, pleon segments 4—6 each with dorsal median fasciele of setules, segment 5 with 2 spinules among the setules, and oblique lateral rows of 3 spines and 2 or 3 spinules, segment 6 with lateral groups of 2 spines. Head, lateral lobes angularly prominent. Side- plates 1—4 with few setules, 1° scarcely expanded distally, 24 and 34 rounded distally, so that the lower edges are not continuous, 4% not so broad as deep. Pleon segments 2 and 3, postero-lateral corners slightly produced. Eyes oblong oval, dark, elose to margin of head. Antenna 1 scarcely more than '/, as long as body, 3% joint half as long as 1°, flagellum longer than peduncle, 9-jointed, accessory flagellum with 2 joints, the last minute. Antenna 2 shorter, ultimate joint of pedunele little or in not at all shorter than penultimate, flagellum half as long as peduncle, with 5 joints inOQ,7 ind, which has both peduncle and flagellum brush-like. Gnathopods 1 and 2 in Q rather small, 6 joint oval quadrangular, palm nearly transverse, in gnathopod 2 the 5t and 6% joints are rather longer, giving a more slender appearance, in the S both gnathopods much stronger, not very unequal, though gnathopod 2 is the larger, 6% joint large, oblong, palm slightly oblique, shorter than the hind margin, finger strong. Peraeopods 1 and 2 rather slender. Peraeopods 3—5 comparatively short and stout, 24 joint in peraeopod 3 subquadrate, in peraeopod 4 broadly expanded above, narrowed below, in peraeopod 5 much larger, with broad expansion abruptly eontracted near the distal end. Uropods 1 and 2, rami equal, with apical spines, inner also with spinule at middle of inner margin. Uropod 3 reaching beyond the others, outer ramus with fascicles of spines but no plumose setae, 24 joint small, distinet, inner ramus small, shorter than the short pedunele. Telson short, broad, lobes N ar ie a en de Zn nA m. PT. 5 aim EL REN SERIES ERNEUERT m: en 45% he g = Bl A: R REN, al h f a : 7 er fi ran > be WU- vi. “ > or Bee er % r... “ a N v .- “ IV ' Mu ” Kl a * r . N EN wid Me Ta, . Ca En ET EN a ur BE le Ten er N ta ae a Tune A al ar h =: an - bi ee TEN BR ; ‘ ä Be ; ar ö + PER, n > x Gammarus ’ 469 little divergent, each with 3 spinules on convex margin, and 1 spinule with 2 setules on rounded apex. L. Q about 6, © 7 mm. Caspian Sea. Depth 0—5 m. . 15. G. pauxillus O.Sars 1896 @. p. (0. Grimm in MS.), G. O. Sars in: Bull. Ace. St.-Pötersb., ser.5 v.4 p. 467 t. 10 f. 1—17. Body slender and eompressed, dorsally smooth except for a few small hairs at end of pleon segments 4—6, segments 5 and 6 each with 1 spinule .on either side. Head, lateral lobes obliquely truncated, upper corner the more prominent. Side-plates 1—4 not very large, without setae, 1° a little expanded distally, 24—4th with front corners rounded off. Pleon segments 2 and 3, postero-lateral corners quadrate. lyes rather large, oblong oval, dark. Antenna 1 slender, more than half as long as body, 22 joint nearly as long as 1°t, flagellum twice as long as peduncle, filiform, 16—20-jointed, accessory flagellum 3-jointed. Antenna 2 scarcely more than half as long, flagellum 5—7-jointed. Gmnathopods 1 and 2 in Q small and feeble, 6" joint oblong, in gnathepod 2 rather longer than in gnathopod 1, slightly widened distally, palm less. oblique. Gnathopods 1 and 2 in J powerful, especially gnathopod 2, 6! joint oblong oval, palm much shorter than hind margin. Peraeopods 1 and 2 slender, with few setae. Peraeopods 3—-5, 24 joint not greatly expanded, narrowing distally, hind margin not forming a free corner. Uropod 3 extending much beyond the others, outer ramus long, narrow, with fascicles of spines, 24 joint spiniform, tipped with 2 unequal setules, inner ramus very small, shorter than the short peduncle. Telson very short, nearly twice as broad as long, the broadly rounded apex of each lobe smooth, but the outer margin . Just above carrying 2 setules. L. Q about 4, J 6 mm. - Caspian Sea. Depth 75—202 m. $ 16. G. kietlinskii Dyb. 1874 @.k., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.57 t.1 f.1 | 1893 @. flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, .20 p. 929. Pleon segments 4—6 each carrying a median and 2 lateral groups of spines on slight elevations of the hind margin, in segment 4 each lateral group having 2 or 3 spines, the median having 2 spines, each on a separate elevation. Head, rostrum short, depressed. Side-plates 1—4 small, low, lower margins not continuous. Pleon segments 2 and 3, postero-lateral eorners obliquely truncate from behind forward. Eyes reniform, narrow, somewhat widened below, black. Antenna 1 about half as long as body, flagellum longer than pedunele, 75-jointed, accessory flagellum 14-jointed. Antenna 2 not much shorter, flagellum shorter than peduncle, 80-jointed, with large calceoli in both sexes. Gmathopods 1 and.2 with 6! joint equal in both sexes, more or less piriform. Peraeopods 3—5, 24 joint very slender, expansion not great above and thence tapering. Uropods 1 and 2 reaching end of shorter ramus of uropod 3. Uropod 3 about "/, as long as body, rami thickly fringed with fascieles of simple setae and having a few plumose setae on inner margin of outer and both margins of inner ramus, the latter ", or ®, as long as outer ramus. Colour red, margins of segments and side-plates, joints and apices of appendages yellow or olive-greenish. L. 81 mm. Lake Baikal. Depth 50 m. 17. G. andrussowi O0. Sars 1896 @.a., G. O. Sars in: Bull. Ae. St.-Petersb., ser.5 v.4 p.469 t.10 f. 18—26. 470 Gammarus Q. Body slender and compressed, pleon segments 4 and 5 each with a median faseiele of 2—4 spinules and 2 lateral groups of 3 spinules, segment 6 with a pair of spinules. Head, lateral lobes broad, vertically truncated. Side- plates 1—4 without setae, 1°* little expanded distally, but broader than 24, 4th rather broad. Pleon segments 2 and 3, postero-lateral corners quadrate. Eyes small, oval reniform. Antenna 1 slender, more than half as long as body, 1° joint not as long as 24 and 34 combined, flagellum twice as long as peduncle, 20-jointed, accessory flagellum 4-jointed. Antenna 2 scarcely more _ than half as long as antenna 1. Gmathopod 1, 5% joint short, 6!" large, oblong oval, palm oblique but well defined. Gnathopod 2 slender. 5" and 6th joints subequal, long, sublinear, palm small, almost transverse, the 6! joint being shorter and very much narrower than in gnathopod 1, but 5% and 6th joints together longer than the same two in gnathopod 1. Peraeopods 1 and 2 rather slender. _Peraeopods 3—5, 2° joint rather broad and expanded, with free corner to hind margin in peraeopod 4 as well as 3 and 5, in peraeopod 5 much larger, with the expansion obtusely truneated below. Uropod 3 extending much beyond the others, outer ramus long, sublinear, with fascicles of spines on each margin, 2% joint small, spiniform, inner ramus scale-like, shorter than the short peduncle. Telson broader than long, lobes rather divergent, each with 1 lateral spine and 3 spinules on the obtuse apex. L. 5 mm. — S unknown. Caspian Sea. 18. G. ischnus Stebb. 1896 @. tenellus (non. J. D. Dana 1852)), G. O. Sars in: Bull. Ae. St.-Petersb., ser.5 v.4 p.455 t.7 f. 12—24 | 1899 @. ischnus, T. Stebbing in: _ Tr. Linn. Soc. London, ser.2 ©.7 p. 428. Body exceedingly slender and compressed, pleon segments 4—6 each with 1 median and 2 lateral fascieles of slender, upturned spinules, usually 2 to a group, sometimes together with a setule. Head, lateral lobes very obliquely truncated, upper angle acutely prominent. Side-plates 1—4 not large, quite smooth, 1° scarcely expanded, distally rounded, 4 not very broad. Pleon segment 2, postero-lateral corners acutely quadrate, in segment 3 acutely produced. Eyes well developed, but rather small, oblong oval, elose te margin of head. Antenna 1 more than half as long as body, peduncle long, 1° joint not as long as 24 and 34 combined, flagellum twice as long as peduncle, 20-jointed, accessory flagellum 4-jointed. Antenna 2 considerably shorter, setose, especially in C, ultimate and penultimate joints of peduncle equal, flagellum 11-jointed. Gnathopods 1 and 2 rather feeble in ©, stronger in C, not very unequaäl, but gnathopod 2 the longer, 6" joint oblong, with palm rather oblique in gnathopod 1 and in G somewhat concave, in gnathopod 2 nearly transverse. Peraeopods 1 and 2 rather slender, much smaller than the others. Peraeopods 3—5, 29 joint narrowiy oval, im peraeopod 5 scarcely differing from that in 4{h, not forming a free corner in any peraeopod. Uropods 1 and 2, outer ramus rather shorter than inner. Uropod 3 very long, outer ramus sublinear, with 5 fascicles of spines on each side, 24 joint spiniform, well defined, tipped with setules, inner ramus seale-like, shorter than the short pedunele. Telson small, much broader than long, lobes divergent, with 2 spinules on outer margin of wide upper part, thence rapidly tapering to obtuse apex with 3 spinules. 1.9 6 mm, © a little longer. Caspian Sea (south of Baku). Depth 11m. 19. G. plaeidus O. Sars 1896 @.p. (O. Grimm in MS.), G. ©. Sars in: Bull. Ac. St.-Pötersb., ser.5 0.4 p.457 t.8 f.1—12. Gammarus 471 Body exceedingly slender, less compressed than in G. ischnus; pleon segments 4—6 each with 1 median and 2 lateral fascieles, the latter containing each 4 spinules in segment 4, 3 in segment 5, 2 in segment 6. Head, _ lateral lobes conspieuously acute, the point sometimes slightly deflexed. Side- plates 1—4 not very large, 1° quadrangular, 24 and 34 slishtly narrowed distally, 4% at least as broad as deep. Pleon segments 2 and 3, postero- lateral eorners acutely quadrate. Eyes dark, very narrow, deep, below a little inflated and bent forward. Antenna 1 slender, nearly ®/, as long as body, 24 joint fully as long as 1°, flagellum twice as long as peduncle, about 33-jointed, accessory flagellum 7-jointed. Antenna 2 shorter, more densely setose, ultimate joint of peduncle (in figure) longer than penultimate, flagellum about 16-jointed. Gnathopods 1 and 2 in © not powerful, setose, subequal, but 5!" and 6! joints in gnathopod 1 rather shorter, 6! oblong oval, palm rather oblique, 6'k joint in gnathopod 2 oblong, palm nearly transverse (in young J gnathopod 2 considerably larger than gnathopod 1). Peraeopods 1 and 2 rather slender, 1° the longer. Peraeopods 3—5 stouter, rather long, often reflexed, 29 joint narrowly oblong oval, without a free corner, in peraeopod 5 of same size and shape as in 4, Uropods 1 and 2, rami spinose, Uropod 3 exceedingly long, outer ramus nearly 4 times as long as pedunele, sublinear, with many fascieles of spines and a few setae on both margins, 2° joint spiniform, inner ramus extremely small, not half as long as peduncle. Telson short, nearly twice as broad as long, lobes not divergent, outer margin almost angularly bent below its 1 spinule, apex obtusely truncated, earıying 1 spinule. L. © 13 mm. Caspian Sea. Depth 4—75 m. 20. G. platycheir O. Sars 1896 @.p., G. O.Sars in: Bull. Ace. St.-Pötersb., ser.5 v.4 p.460 t.8 f. 14—17. S(?). Body rather robust, back broadly vaulted, pleon segments 4—6 dorsally each with 2 adjacent spinules, segment 6 also with a spinule on either side. Head, lateral lobes rather broad, vertically truncated. Side- plates 1—4 rather deep, setose, 1° smallest, 1% and 24 distally narrowed, 34 much larger, oblong, 4" nearly as broad as deep. Pleon segments 2 and 3, postero-lateral corners quadrate, 24 on anterior lateral margin closely fringed with delicate, curved setae. Eyes not large, oval reniform. Antenna 1 very short. not '/, as long as body, 1° joint as long as 24 and 32 combined, flagellum shorter than pedunele, 12-jointed, accessory flagellum 4-jointed. Antenna 2 as long or a little longer, flagellum 11-jointed. Gmnathopod 1 much the smaller. Gnathopod 2, 5! joint small, 6! very large, flattened, gradually expanding to the long, oblique, evenly eurved palm, which is densely fringed with spiniform setules, and defined by 3 strong spines, among which the tip of the long faleiform finger eloses down. Peraeopod 2 more setose than peraeopod 1. Peraeopod 3 much shorter than peraeopods 4 and 5, 24 joint in peraeopods 3 and 4 narrowed below, without a free corner, in peraeopod 5 much larger, oblong oval, hind margin closely fringed with setules. Uropod 3 reaching beyond the others, outer ramus subfoliaceous, twice as long as peduncle, fringed with setae, 24 joint very small, inner ramus about "/, as long as outer, with 2 spinules at apex. Telson about as long as hroad, left not quite to the base, the broad lobes distally divergent, with 3 spinules on the blunt apex of each. L. 16 mm. Caspian Sea (mouth of Volga). 21. G. pungens M.-E. 1840 G.p., H. Milne Edwards, Hist. nat. Crust., v.3 p-47 | 1893 G. p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 764 t. 24 f.35 | 1862 a et) ® SEP '@ A e 472 Gammarus @.p., Niphargus (part.)?, Bate, Cat. Amphip. Brit. Mus., p.217 | 1888 @. (N.) p., T. Stebbing in: Rep. Voy. Challenger, v.29 p.253 |; 1890 N. p., Wrzesniowski in: Z. wiss. Zool., v. 50 p. 603, 673 | 1865 Gammarus veneris, Cam. Heller in: Verh. Ges. Wien, v.15 p.981| 1894 G. v., Chevreux in: Bull. Soc. zool. France, v.19 p.171 f. | 1895 @. v., Chevreux in: Rev. biol. Nord France, v.7 p. 159. Near to G. marinus. Body slender and compressed, pleon segments 4 and 5 each with 1 or 2 spinules at 4 points of back, segment 6 with spines apparently only at 2 points. Head, lateral lobes rather obliquely truncate, post-antennal corners almost acute. Pleon segment 3, postero-lateral corners produced acutely backward. Eyes narrow, oblong reniform, dark in spirit. Antennae 1 and 2 liable to variations in many respects. Antenna 1 nearly half as long as body, 1° joint not longer than 24, 34 about half as long as 24, flagellum twice as long as peduncle, 34-jointed, accessory flagellum 4—6- jointed. Antenna 2 considerably shorter, with longer peduncle, penultimate joint of peduncle stouter than ultimate, but scarcely so long, flagellum sub- equal to peduncle, 16-jointed, the calceoli short and broad. Maxillipeds, 34 joint of palp slightly curved and distally widened. Gmathopods 1 and 2, 6th joint oblong oval, palm rather oblique, slightly sinuous and serrulate, ill-defined except by the palmar spines, finger in gnathopod 1 elosing more deeidedly against inner surface of hand than in the larger gnathopod 2. Peraeopods 1—5 all slender, 24 joint in peraeopods 3—5 distally narrowed, free corner quadrate, not very prominent. Uropod 3 reaching much beyond the others, outer ramus more than thrice as long as peduncle, 1° joint with spines at 4 points of outer and 3 of inner margin, both margins fringed with long conspicuous setae, 24 joint also setose, very small, inner ramus shorter than peduncle, very slender, smooth on inner margin, with spines and setae on outer and apex. Telson cleft to base, little longer than broad, each lobe with 1 spine high up on outer margin and 2 at the narrowed truncate apex. Colour grey or brownish, rarely with rusty spots. L. 6—12 mm. Italy (hot springs?); Sieily; Cyprus (fresh water, 15—16m above the sea); Syria. 22. G.marinus Leach 1815 @. m., Leach in: Tr. Linn. Soc. London, v.11 p.359 | 1862 G. m., Bate, Cat. Amphip. Brit. Mus., p.215 t.38 f.4 | 1889 G. m., A. M. Norman in: Ann. nat. Hist., ser. 6 v.4 p.138 t.12 f.12 ! 1893 G. m., A. Della Valle in: F. Fl. Neapel, v.20 p.762 t.60 f.28 | 1894 @.m., G.O.Sars, Crust. Norway, v.1 p.497 t.175| 1830 @. olivii, H. Milne Edwards in: Ann. Sei. nat., v.20 p. 367, 372 t.10 f.9, 10| 1837 @. gracilis, H. Rathke in: M&m. pres. Ac. St.-Petersb., v.3 p.374 t.5 £.7—10 | 1840 @. affinis, H. Milne Edwards, Hist. nat. Urust., ©.3 p.47 | 1843 @. poecilurus + @. kröyerii, H. Rathke in: N. Acta Ac. Leop., 0.201 p.68 t.4 f.2; p.69 t.4 f.1 | 1851 @G. locustoides, F. Brandt in: Middendorff, Reise Sibirien, v.21 p.139 t.6 f.30a—c. Body slender and compressed, pleon segments 4—6 each dorsally carrying 2 upward converging rows of spinules, each row having 6—9 spi- nules in 2 slightly separated groups. Head, lateral lobes vertically trun- cate. Side-plates 1—4 not very deep, 4 scarcely as broad as deep. Pleon segments 2 and 3, postero-lateral corners acutely quadrate. Eyes narrow, long, oblong reniform, dark. Antenna 1 nearly half as long as body, 1° joint as long as 24 and 34 combined, flagellum more than twice as long as peduncle, 33-jointed, accessory flagellum about 7-jointed. Antenna 2 sometimes con- siderably shorter, flagellum rather longer than peduncle. Gnathopod 1, oblong oval, palm slightly oblique, both 5th and 6tk joints rather longer and stronger in C than in ©. Gmnathopod .2 in Oo, 5tk joint longer than in gnathopod 1, 6" oblong, with palm nearly transverse, not larger than in gnathopod 1. Gnathopod 2 in OS not larger than gnathopod 1, palm nearly transverse. Be ieaninan nn aan rs ne in, i r DE ERS en . Fr Ko A a a I RT re ET Er ER rl ZEIG a a E wi SEEN ER, Ya a rg Sa Pr BASEHE ee Fr re ee ee Gammarus r 473 Peraeopods 3—5 rather short and stout, 24 joint in peraeopod 3 with lower hind corner rounded, free, in peraeopods 4 and 5 narrowed distally, without a free corner. Uropod 1 reaching beyond uropod 2, uropod 3 beyond uropod 1. - Uropod 3, outer ramus long, with spines and setae on both margins, 24 joint small, spiniform, inner ramus very narrow, scarcely '/, as long as’ outer. Telson rather small, lobes distally divergent, each with 2 marginal spines near base, and 3 on the truncate apex, 1 or 2 setules usually near outer margin a little above apex. Colour greenish or yellowish brown. L. 15 mm. North-Atlantie with adjoining seas (Europe, from Trondhjemsfjord round the marine coasts to the Black Sea; North-East-America). Littoral. 23. G. simoni Chevreux 1894 @. s., Chevreux in: Bull. Soe. zool. France, v. 19 p. 171 £.2—10. Pleon segments I—3 each with 2 or 3 dorsal setules, segments, 4—6 with dorsal spinules, segment 4 with 2 near together, segment 6 with 2 wide apart, segment 5 with 2 pairs, each pair having between then 2 setules. Head, lateral lobes obtusely truncate. Side-plate 4 rather less broad than deep. Pleon segments 2 and 3, postero-lateral corners produced, acute. Eyes small, oval. Antenna 1 in d ?/, as long as body, peduncle short, 1° joint as long as 24 and 39 combined, flagellum twice as long as peduncle, 30—35- jointed, accessory flagellum (1-) 3—5-jointed. Antenna 2 in JS considerably shorter, peduncle robust, ultimate and penultimate joints tufted with long setae, flagellum 12-jointed, */, (or less) of it setose like peduncle, apparently without calceoli. Antenna 1 in Oo as in Cd. Antenna 2 in © shorter, less robust, setae few and short. Gnathopods 1 and 2 in © feeble, 6! joint oblong, tending to oval, with oblique palm in gnathopod 1, rather longer and narrower, with palm almost transverse in gnathopod 2. Gmathopod 1 in S, side plate with sinuous front margin (in figure), 6% joint large, piriform, with 6 spines on hind margin and palm, finger long, eurved, its apex closing against side of 6! joint. Gnathopod 2 in S scarcely larger, 6tk joint oval, with 3 spines on the convex palm, which the finger fit. Peraeopods 1—5 short and robust. Uropod 2 reaching nearly as far as uropod 1. Uropod 3, outer ramus long and broad, fringed with spines and plumose setae, 24 joint small, Spiniform, with apical setae, inner ramus rather broad, about '/, as long as 1° joint of outer, with 2 apical spines. Telson with broad divergent lobes, each having a spine on outer margin near the base, 2 spines and some setules on rounded apex, and in S a sub-central spinule. 1L. O0 6, 0 reaching 8 mm. Algeria and Tunis. Fresh water. 24. G. duebenii Lilj. 1851 @.d., W. Liljeborg in: Öfv. Ak. Förh., v.8 p.22 | 1888 @. d., T. Stebbing in: Rep. Voy. Challenger, v.29 p.252 | 1894 @. dwebeni, G. O. Sars, Crust. Norway, v.1 p.502 t.177 £.1 | 1895 @. duab&ni, T. Scott in: Rep. Fish. Board Seotl., v.13 p.180, 244 | 1862 @. locusta (part.), Bate, Cat. Amphip. Brit. Mus., p- 206 | 1876 @. 1, A. Boeck, Skand. Arkt. Amphip., v.2 p.367 | 1893 @. 1. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 760 | 1874 G@. marinus (part.), Ritzema Bos, Bijdr. Crust. Hedriophthal., p.44 | 1889 G. campylops (err., non Leach 1815!), A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p.139 t.12 £.13 | 1889 @. locusta var. C, Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 ».2 p.219 t.10 f. 13, 13°. In form like G. loeusta (p. 476). Pleon segments 4—6 each with 2 spines in median dorsal group and 3 in each lateral group, also clothed with numerous- rather long hairs. Head, lateral lobes vertically truncate. Side-plates 1—4 smaller than in G. locusta, more like those in G. marinus. Pleon segments 2 and 3, postero-lateral corners acutely quadrate. Eyes not very large, reni- De PIIECHR Te ae ER RS, IE na KPI=" SE e ‘ Zu, aa. Bar nt ale 474 Gammarus form, dark. Antenna 1 not quite half as long as body, 1° joint scarcely as long as 24 and 32 combined, flagellum about twice as long as peduncle, accessory flagellum about 6-jointed. Antenna 2 considerably shorter, flagellum with calceoli ind. Gnathopods1 and 2 in O nearly as in G. loeusta, but 6** joint of gnathopod 2 not so narrow. Gmathopods 1 and 2 in C not so strongly developed as in G. locusta, and less unequal. Peraeopods 3—5 not very slender, 24 joint in peraeopod 3 with lower hind corner rounded. Uropod 3, rami densely setose, inner much more slender than outer, and reaching nearly °/, of its length. Telson rather broader than long, each lobe with 4 apical, 1 subapical, and 2—4 lateral spines, the last near the base, the spines accompanied by long diverging setae. Colour generally dark, with the usual pink marks on sides of pleon segments 1—3. L. G 15 mm, 9 smaller. . South Greenland (warm springs); Norway (beach, under stones and algae, and in brackish pools above high water mark); Kattegat; Dutch coast; Guernsey; England; Ireland; lochs of Shetland, Outer Hebrides, and Perthshire. 25. G. pulex (L.) 1758 Cancer p. (part.), Linne, Syst. Nat., ed.10 p.633 | 1763 C. p., Seopoli, Eut. Carniol., p.412 | 1775 Gammarus p.. J. ©. Fabrieius, Syst. Ent., p. 418 | 1876 @. p., A. Boeck, Skand. Arkt. Amphip., ©.2 p.373 t.24 f.7 | 1888 @. »., T. Stebbing in: Rep. Voy. Challenger, v.29 p.44, 253, 1703 | 1894 @.p., G. O. Sars, Crust. Norway, v.1 p.503 t.177 f.2 | 1777 Astacus p., Pennant, Brit. Zool., ed.4 v.4 p.17 | 1778 Squilla p., Geer, M&m. Hist. Ins., ©. 7 p. 525 | 1793 Cancer (Gammarellus) p. (part.), J. F. W. Herbst, Naturg. Krabben Krebse, v. 2 p. 130 (not figure!) | 1808 C. (Gammarus) p., Montagu in: Tr. Linn. Soc. London, ©. 9 p. 98 t.4 f.2 | 1815 Gammarus aquaticus, Leach in: Tr. Linn. Soe. London, v.11 p.359 | 1830 @. fluviatilis, H. Milne Edwards in: Ann. Sei. nat., 9.20 p. 368 | 1898 @. f. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 763 | 1835 @. fossarum, C.L. Koch, ©. M. A., v.5 nr.2 | 1839 @. stagnalis, Andrzeiowski in: Bull. Soc. Moseou, nr.1 p.23 | 1863 @. lacustris, G. O. Sars in: Nyt Mag. Naturv., ©.12 p.206 | 1867 @. neglectus, G. ©. Sars, Crust. d’Eau douce Norvige, p.46 t.4,5; t.6 £. 1—20 | 1889 @. loeusta var. B, Hoek in: Tijdsehr. Nederl. dierk. Ver.. ser.2 v.2 p.214 t. 10 £.12, 12’. Pleon segments 4—6 each with 2 spines in median dorsal groups and a single spine on each side. Head, lateral lobes vertically truncated, less broad than in G. duebenii (p.473). Pleon segments 2 and 3, postero-lateral corners simply quadrate. Eyes small, oval, black. Antenna 1 nearly half as long as body, 1°t joint not as long as 24 and 3% combined, flagellum twice as long as peduncle, 25—28-jointed in C, accessory flagellum only 4-jointed. Antenna 2 con- $iderably shorter, flagellum 12-jointed, in S with calceoli. Gnathopods 1 and 2 in © rather small, 6" joint in gnathopod 1 with oblique palm, in gnathopod 2 narrow, oblong, palm nearly transverse. Gmnathopods 1 and 2 in J rather stronger, 6tk joint in gnathopod 1 piriform, in gnathopod 2 of about the same size, but rather oblong, widening slightly to the palm which is far less oblique. Peraeopods 1—5 slender, 24 joint in peraeopod 3 with lower hind corner rounded, in peraeopods 4 and 5 without a free corner, but hind margin convex. Uropod 3 long, rami fringed with long setae, some plumose, inner ramus subequal in length to 1° joint of outer (Sars) or ®/, as long as the whole ramus (Chevreux), with a single spine on inner margin near base. Telson rather small, each lobe with 2 apical spines and 1 on outer margin near the base. Colour dark or liebt brownish green. L. © reaching 20 mm, 9 smaller. Europe. Lakes and streams, generally distributed, found even in lakes 900-- 1200 m above the sea. nn a u a & Bi a 475 26. G. delebeequei Chevreux & Guerne 1892 @.d., Chevreux & Guerne in: ‚Bull. Soe. zool. France, v.17 p. 136 | 1893 @. fluviatilis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 889. General form of body, armature of pleon segments 4—6, postero- lateral corners in segments 2 and 3 as in G. pulex. Eyes much larger, faintly reniform. Antenna 1 more than half as long as body, flagellum 32—35- jointed, more than twice as long as peduncle, accessory flagellum 4-jointed. Antenna 2 shorter than 1°, but more slender and elongate than in G. pulex, flagellum shorter than ultimate and penultimate joints of peduncle combined, 12-jointed, with setae of uniform length. Gnathopods 1 and 2 as in G. pulex, but with 6% joint a little narrower, and peraeopods 1—5 rather more slender. Peraeo- pods 4 and 5, 24 joint with sinuous hind margin, rather abruptly narrowing distally. Uropod 3, rami more sparsely fringed with setae, the outer with several groups of spines on outer margin, the inner slender, not more than half as long as the 1% joint of outer. Telson apparently as in G. pulex. L. DO 8, d 12 mm. France (from a warm spring at the bottom of the Lae d’Anneey). 27. G. hyacinthinus Dyb. 1874 @. h., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.70 | 1893 @. fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v,20 p.929. Pleon segments 4—6 each with dorsal spinules in 4 groups of 1, 2 or 3 a-piece. Eyes rather large, reniform, black. Antenna 1 not half as long as body, flagellum thriee as long as peduncle, 28-jointed, accessory flagellum 4-jointed. Antenna 2 °/, as long as antenna 1, flagellum 15-jointed. Gnatho- pods 1 and 2 not large, 6" joint in gnathopod 1 piriform, rather longer than tlıe oblong 6*" joint in gnathopod 2. Peraeopods 3—5, 24 joint tolerably broad, front and hind margins convex, the hind one ending below in a pointed corner. Uropods 1 and 2 reaching °/, length of uropod 3. Uropod 3 not very long, outer ramus with plumose setae only on the inner margin, inner about */, as long as outer, with plumose setae on both margins. Colour variable, greenish, yellowish, or bright reddish. L. 15 mm. Lake Baikal. Depth 100-300 m. 28. G. syriacus Chevreux 1895 @. s., Chevreux in: Rev. biol. Nord France, 0.7 p. 160 f. Body rather robust. Pleon segments 1—3 with some stiff dorsal setae, segments 4—6 each with a transverse elevation of hind margin armed with a variable number of spines, usually 2 median and 1 on each side in segments 4 and 5, and only 1 on each side in segment 6; the spines accompanied by setae. Head, lateral lobes vertically truncate, the sinus below smaller than usual. Side-plates 1—4 deep, 4!" much deeper than broad. Pleon segments 1—3, postero-lateral corners acutely and uneinately produced, chiefly 'in segment 3. Eyes of moderate size, reniform. Antenna 1 in d more than half as long as body, flagellum feebly armed, more than twice as long as peduncle, 40-jointed (21-jointed in Q ), aceessory flagellum 4-jointed. Antenna 2 considerably shorter, ultimate joint of peduncle rather longer than penultimate, flagellum about 14-jointed, apparently without calceoli. Gnathopods 1 and 2 as in G. pulex. Peraeopods1 and 2 with faseicles of long setae on hind margin. Peraeopods 3—5 robust, not elongate, 24 joint in peraeopod 3 with lower hind corner quadrate, in peraeopods 4 and 5 hind corner not free. Uropod 3, outer ramus fringed on outer margin with long plumose setae, inner ramus over ”/,; as long as outer, with 1 or 2 spines and a fringe of short plumose setae 476 Gammarus on inner margin. Telson much longer than broad, lobes each with 2 long: spines and some long setae on the apex, which is obliquely truncate from within; higher up are ‚2 fascicles of setae. L. 2 10, © reaching 19 mm. Syria. Fresh water. 29. G. locusta (L.) 1758 Cancer l., Linne, Syst. Nat., ed.10 p.634 | 1775. Gammarus l., J. C. Fabrieius, Syst. Ent., p.418 | 1862 @. 1., Bate, Cat. Amphip. Brit. Mus., p. 206 t.86 £.6 | 1889 @. 1., A. M. Norman in: Ann. nat. Hist., ser.6 v.4 p. 137 t.12 £.11 |] 1889 @. l., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.206 t.7 £.10“; t.10 £.10, 10' | 1893 @. 1. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 759 .2 f.1; t.24 f.20— 34; 1.45 £.1—11|1890&94 G.1., G.O.Sars, Crust. Norway, v.1t.1; p.499 t.176 £.1| 1808 Cancer (G.)l., Montagu in: Tr. Linn. Soc. London, v.9 p.92 t.4 f.1 | 1766 Oniscus pulex (part.), Pallas, Misc. zool., p.190 | 1853 Gammarus p., Stimpson in: Smithson. Contr.,. v.6 nr.5 p.55 | 1820 @. arcticus (Leach in MS.), Scoresby, Account arct. Regions, v.1 p.541 t.16 £.14 | 1821 & 24 @. boreus, E. Sabine in: W.E. Parry, J. Voy., Suppl. p. 51; p.229 | 1830 G. ornatus, H. Milne Edwards in: Ann. Sci. nat., v.20 p. 367, 369 t. 10- f.1-—8 | 1851 @. sitchensis, F. Brandt in: Middendorff, Reise Sibirien, v. 21 p. 187 t.6 f.28a—e | 1855 G. mutatus, W. Liljeborg in: Vetensk. Ak. Handl., 1853 p. 447. Pleon segments 4--6 each with median dorsal elevation camying 3—5 spinules, lateral groups well separated, each with 3 or 4 spinules. Head, lateral lobes angularly produced. Side-plates 1—4 larger than in G. marinus (p. 472), especially in Q ; side-plate 4 nearly as broad as deep. Pleon segments 2 and 3, postero-lateral corners acutely produced. Eyes rather large, reniform, Palp black with chalky white coating. Antenna 1 in.Q not quite half as long as body, in J rather longer, € 1°: joint subequal to 24 and 34 combined, flagellum Outer plate _ twice as long as peduncle, accessory flagellum about Inner plate 8-jointed. Antenna 2 shorter, flagellum about as long as ultimate and penultimate joints of pedunele combined, with calceoliind. Gnathopods 1 and 2 in 9, 6" joint Fig. 87. Fig.ss. oblong, in gnathopod 2 longer and narrower. Gnatho- Fig. 87&88. G. locusta. pod 1 in 3, 6! joint piriform; gnathopod 2, 6% joint after H 7 Hansen) Much more powerful, irregularly oblong, palm oblique though less so than in gnathopod 1, in both with strong spine at centre. Peraeopods 3—5 rather slender and elongate, 24 joint in peraeo- pod 3 forming a free corner, which is produced to an acute point. Uropod 3 elongate, rami fringed with plumose setae and several spines, inner ramus nearly equal to 1% joint of outer. Telson longer than broad, each lobe with 3 apical spines. and a seta, a spine and seta near the apex, and near the base 2 or 3 spines and one or two setae. Colour more or less dark brownish green, with-pinkish mark on sides of pleon segments 1—3. L. S 20— (aretie mei 48 mm, o usually considerably smaller. Arctie Ocean, North-Atlantie with adjoining seas (East of United States of America, Europe). From shore to 100 m. 30. G. camylops Leach 1813/14 @. c., Leach in: Edinb. Ene., v.7 p.403 | 1815 @. campylops, Leach in: Tr. Linn. Soe. London, v.11 p.860 | 1862 @. c., Bate & Westwood, Brit. sess. Crust., ©. 1 p. 875 f..| 1894 @. e., G. O. Sars, Orust. Norway, v.1 p.500 t. 176 f.2|1819 @. camptolops, (Leach in:) Samouelle, Ent. Compend., p. 104 | 1862 @. c., Bate,, Cat. Amphip. Brit. Mus., p.209 t.37 f.3 | 1830 @. camphylops, H. Milne Edwards in: Ann. Sei. nat., v.20 p. 367. Pleon segments 4—6 each with 2 median dorsal spinules and 2 on each side. Head, lateral lobes rather obliquely truncate, with very small ne ln mh Wen hun at A min Aue a. dh 4 Se N ONE sie TE ENGEN " - a an Bi; ENDE ET md {m . > ’ a 2a £ > Au - rw: 4 DAT an m ” 4 Fr re er ig BET Den ln Me B Ü ” “ £. r Eu); Mr} % Th da a ee ne Dr a nn" a in BE > . r ara eh eis a 5 vr IE FRE 1 Hindi ee ie ae Gammarus, Poekilogammarus 477 sinus below. Side-plates 1—4 rather small, 4!" not nearly so broad as ‚deep. Pleon segments 2 and 3, postero-lateral corners acute, but little produced. Eyes constrieted in the middle, slightly sigmoid, very dark. Antenna 1 fully half as long as body, 1° joint rather longer than 24 and 34 combined, flagellum nearly thrice as long as pedunele, accessory flagellum about 6-jointed. Antenna 2 shorter, flagellum in S with no apparent calceoli. Gmathopods 1 and 2 as in G. locusta, except that gnathopod 2 has 6!% joint in © rather shorter and in J less obliquely truneated. Peraeopods 3—5 rather slender and elongate, 2° joint in peraeopod 3 with lower hind corner nearly quadrate. Uropod 3, inner ramus not nearly as long as 1° joint of outer, and with fewer spines than in G. locusta. Telson scarcely so long .as broad, lobes divergent, each with 3 apical spines, and on outer margin l spine' near apex and 1 near base. Colour semipellucid, pale greenish with the usual pink markings faintly indieated. L. 9 scarcely over 6 mm, O smaller. North-Atlantie, North-Sea and Skagerrak (South-Norway, in oyster-bed above sea- level; in shallow water at Christianiafjord; Isle of Arran; Shetland; Belfast); Kuttegat. G. tunetanus E. Sim. 1886 @. £., E. Simon in: Expl. Tunisie, Crust. p.6 | 1893 @. fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, ©.20 p. 768. Said to differ from G. pulex (p.474) by having integument more sparingly and very minutely punctate, head a little longer and in front a little attenuate, eyes more elongate reniform, extending a little over the base of the antennae, accessory flagellum of antenna 1 longer, 6-jointed, reaching 6th joint of primary flagellum, 3d, 4th and 5th joints a little longer than the rest, equal to one another, flagellum of antenna 2 shorter, 8-jointed, all the joints a little longer than broad. From G. locusta it is said to differ by the much shorter flagellum of antenna 2, with the joints fewer and almost smooth. Tunis (Kerouan). 45. Gen. Poekilogammarus Stebb. 1899 Poekilogammarus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 428. In general like Gammarus (p. 460), but usually with dorsal hairs or spinules on all segments of peraeon and pleon, and head rostrate. Antenna 1 with peduncle longer than peduncle of antenna 2, 34 joint longer than 24. - Upper lip with wide, almost straight, apical margin; lower lip as in Axelboeckia (p. 391), the prineipal lobes separated by what may be regarded as rudimentary inner lobes. Maxilla 1, inner plate with about 6 setae. Maxillipeds, outer plates not reaching far along 34 joint of palp. Gnathopod 1, 6% joint larger than in gnathopod 2. Uropod 3 with equal rami, both carrying plumose setae, outer ramus 1-jointed. ix 4 species, Synopsis of species: ' Only pleon segments d—6 ke dorsal spinules; head DSB TOBLFALD Bee erh Ppietus.-+.27Ppr428 iss han of peraeon and pleon with setules or spinules; head rostrate — 2. 1 Peraeopod 5, 2d joint rather broad — 3. DE RE RO N en rn. 3. P.talitrus . . p. 478 Bose EBEN übtune: si: 272 Sn 4. P. araneolus . p.479 9 ve Peraeopod 5, 24 joint slender. . .. ......2.... 2. P. orchestes . p. 478 2 478 Poekilogammarus 1. P. pietus (Dyb.) 1874 Gammarus p. + Var. «a + Var. 8, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.108 t.12 f.3; p.104 t.12 f.2(juv.) | 1899 Poekilo- gammarus p., T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.428 | 1895 Gammarus fluviatilis (part.)?, A. Della Valle in: F, Fl. Neapel, v.20 p. 930, Pleon segments 4—6 with delicate dorsal spines. Head in front almost straight, rostral point scarcely indieated. Eyes moderately large, very prominent, as if set on tubercles, oval, black or brown. Antenna 1 longer than ?/, body (in young speeimens longer than body), more than twice as long as antenna 2, 24 joint only about ?/, as long as 34, flagellum 41—58-jointed, . accessory flagellum 6-jointed. Antenna 2, ultimate joint of peduncle rather shorter than penultimate, flagellum 9—-I1-jointed. Gmathopods 1 and 2 ‚little differing in size or even in shape, 6% joint oblong, with palm more oblique in gnathopod 1, hind margin longer in gnathopod 2, and 'the joint slightly widening to the palm. Peraeopods 3—-5, 24 joint not very wide, narrowing gradually from above downward, hind margin setose. Uropod 1 reachiug end of uropod 3. Uropod 3 moderately long, the 1-jointed equal rami fringed with plumose setae. Colour whitish yellow, variegated, with brownish or greenish yellow markings. L. 32 mm. Lake Baikal. Depth 50-100 m. 2. P. orchestes (Dyb.) 1874 Gammarus o., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.104 | 1899 Poekilogammarus o., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.428 | 1898 Gammarus pietus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Segments Of peraeon each provided with 2—4 delicate setae; segments of pleon completely covered with them. Head with middle dorsal line convex, rostrum short, projeeting with a slightly downward direeted curve, its apex obtuse. Eyes rather small, prominent, ovate, a little narrowed above, black. Antenna 1 a little shorter than body, almost twice as long as antenna 2, 24 joint about */, shorter than 34, flagellum not twice as long as pedunele, 21-jointed, accessory flagellum 2-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum shorter than pedunele, 7-jointed. Gnathopod 1, 6" joint piriform. Gnathopod 2, 6t joint oblong. Peraeopods 3—5, 24 joint slender, in front convex with long pendent setae, behind flatly concave or straight, with 5 or 6 setules. Uropods 1 and 2 scarcely reaching middle of uropod 3. Uropod 3 rather long, '/,—'/, as long as body. Colour yellow, spotted with yellow‘brown. L. about 10 mm. Lake Baikal. Depth 150 m. 3. P. talitrus (Dyb.) 1874 Gammarus t., B. Dybowsky in: Horae Soc. ent. Ross., v. 10 suppl. p.105 t.11 f.5 | 1899 Poekilogammarus t., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.428 | 1893 Gammarus pictus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Segments of peraeon each with 2—4 delicate setae; segments of pleon with delicate, irregularly arranged setae on surface and hind margin. Head with a rather long, straight, acute rostrum, downward bent only near the point. Eyes moderately large, prominent, elongate oval, slightly narrowed below, not far apart above, black. Antenna 1 about thrice as long as antenna 2, in J about as long as body, in Q rather shorter, 24 joint about */, shorter than 34, flagellum more than twice as long as peduncle, 28—39-jointed, accessory flagellum 3—6-jointed. Antenna 2, ultimate and penultimate joints of pedunele sub- equal, flagellum shorter than pedunele, 11-jointed. Gnathopod '1, 6!" joint war N AmpE Poekilogammarus, Echinogammarus 479 piriform (in figure oblong oval). Gmnathopod 2, 6" joint narrowly oblong, nearly 3 times as long as 5th joint. Peraeopods 3—5, 2% joint moderately broad, in peraeopod 5 with 7 or 8 rather long setae on front and hind margins (in figure rather wider above than below, hind and lower margins nearly straight). Uropod 1 reaching much beyond uropod 2, but scarcely to middle of uropod 3. Uropod 3 '/,—'/, as long as body. Colour bright yellow with bright brown spots. L. about 14 mm. Lake Baikal. Depth 100—200 m. 4. P. araneolus (Dyb.) 1874 Gammarus a. + @. a. var. qwinquefasciatus + @. a. var. ephippiatus, B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.106 t.11 £.3; p.107 t.11 £.7; p.107 t.11 f.8 | 1899 Poekilogammarus a., T. ae? in: Tr. Lan. Soe. London, ser.2 v.7 p.428 | 1893 Gammarus Auviatilis (part.)?, @. pietus (part.)?, A. Della Valle in: .F. Fl. Neapel, v.20 p.927; p. 928, 930. All segments of peraeon and pleon carrying short dorsal setae or very thin spinules; on peraeon segments 1—6 the setae generally on the hind margin, on peraeon segment 7 and pleon segments 1—6 over all the dorsal surface (fewer setae in var. ephippiatus). Head as in P. orchestes. Eyes large, prominent, ovate, slightly narrowed below, black. Antenna 1 only half as long as'body, twice as long as antenna 2, 24 joint a little shorter than 34, flagellum about twice as long as peduncle, 19—25-jointed, accessory » flagellum 3- or 4-jointed. Antenna 2, ultimate and penultimate joints of pedunele subequal, flagellum shorter than pedunele, 5—8-jointed. Gnathopod 1, ‚6b joint piriform. Gmathopod 2, 5" joint not elongate, 6% oblong, in C widening to the palm. Peraeopods 3—5, 24 joint tolerably broad, front and hind margins 'feebly convex, hind 'margin with short setae. Uropod 1 reaching end of uropod, 3, uropod 2 only end of peduncle of uropod 3. 'Uropod 3 tolerably long, '/, as long as body. Colour bright green or bright 'greenish. yellow with brownish yellow spots; in var. quinguefaseiatus, trans- versely banded, head and peraeon segments 1—3 reddish brown, segmeats 4 and 5 bright yellow, segments 6 and 7 and pleon segments 1 and 2 brown, pleon segments 3—6 and telson bright yellow, uropod 3 brown; in var. ephippiatus brownish yellow or dark green, with a saddle-like brightening of peraeon segments 6 and 7. L. 11—14 mm. Lake Baikal. Depth 10—50 m. 53 T i , 2 $ 3 2 46. Gen. Echinogammarus Stebb. 1793 [Sübgen.] Gammarellus (part.). J. #. W. Herbst, Naturg. Krabben Krebse, v.2 ‘'p.106 | 1899 Echinogammarus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 0.7 p.428. In general like Gammarus (p. 460), but with dorsal spines on segments anterior to pleon segment 4 (Fig. 89 p.481), antenna 1 the longer, with peduncle shorter than peduncle of antenna 2, and 6tk joint of gnathopod 1 almost always larger than that of gnathopod 2. 27 accepted and 1 doubtful species. "Synopsis of accepted speeies: long as outer — 2. Uropod 3, inner ramus-about half as long as | outer — 10. | Uropod 3, inner ramus much less than half as Uropod 3, inner ramus much more than half as long as outer — 14. 480 jr men N oO DD je [So] DD —— —— — —— — —— Echinogammarus Gnathopod 1, 6th joint smaller than that of gnathopäd ER N ee ea Gnathopod 1, sth Stat 1 than that of. guathopbd 2 — 8 Pleon elosely beset with spines. ...... Pleon with spines not closely set — 4. Uropod Babel, rast Uropod 3 long — 5. Uropod 8, outer ramus abnormally long. . . Uropod 3, outer ramus not abnormally long — 6. Antenna 1 eonsiderably more than half as long as body — 7. Antenna ! about half as long as body — 9. Uropod 3 with setae short, separate . ... . Uropod 3 with setae long, in fascicles — 8. Pleon segments 1 and 2, dorsal spinules not confined to hind margin .....2.. Pleon segments l and 2, dorsal spinules Saal unless on hind margin . . ERDE Pleon segment 3 with long dorsal hairs. . . Pleon segment 3 without dorsal hairs . . Pleon segment 1 without spines Pleon segment 1 with spines — 11. Gnathopod 2, 6th joint piriform . ».... Gnathopod 2, 6th joint oblong — 12. Pleon segment 3 without lateral ridge. Pleon segment 3 with lateral ridge — 18. Bank of: PIBORFWBHF.. N 5:4 Zi uk Back of pleon not warty.. .. 2... Peraeon segment 7 dorsally spinose — 15. Peraeon segment 7 not dorsally spinose — 19. Eyes shaped like a retort . 2. ...2.2..» Eyes reniform — 16. Peraeon segment 7, spines in a continuous series Peraeon segment 7, spines in groups — 17. Peraeon segment 7, spines in 6 groups . . Peraeon segment 7, spines in 2 groups — 18. Eyes narrowly reniform . % Eyes broadly reniform. .. ... Eyes irregularly shaped Eyes regularly shaped — 20. Antenna 1 little longer than antenna 2, about half as long as body — 21. Antenna 1 much longer than antenna 2, much more than half as long as body —- 22. No pleon segment with more than one row of dorsal spinules Some segments of pleon with more ma one row of dorsal spinules 2... .... Eyes white; antenna 1 more than twice as long as body ENT a Eyes black or die: antenna 1 less than twice as long as body — 23. 1. E. berilloni . p. 481 2. E. verrucosus . . . p.481 3. E. saphirinus « p. 482 4. E. czerskii. . . p.482 5. E.maackii . . . . . p.483 6. B.lividus . . . ... p.483 T. Bvidlb .. 5224 p- 484 8. E. ceyaneus. . p- 484 9. E. ochotensis . pP. 484 10. E. testaceus . . . . p.485 11. E. sophiae . . p. 485 12. E. fuseus FE 486 13. E. murinus ..p. 486 14. E. aheneus. . . pP. 487 15. E.sarmatus :. . . . p.487 16. E. capreolus. . . . p.488 17. E. ussolzewii . pP. 488 18. E. stenophthalmus . p. 489 19. E. schamanensis . . p. 489 20. E. leptocerus pP. 490 21. E. toxophthalmus . p. 490 22. E,vittatus. .. . . p. 491 23. E. petersi . ....p.491 Pr a en area se 24. E. violaceus . : . . p.492 Eyes large — 24. Uropod 3, outer ramus little longer than inner 25. E.ibex . ..... p- 492 24 | Uropod 3, outer ramus considerably longer than inner — 285. . f Gnathopod 1, 6th joint much inflated at base. 26. E. parvexii . . . . p.493 2 \ Gnathopod 1, 6th joint not inflated at base . 27. E. polyarthrus. . . p.493 1. E. berilloni (Catta) 1878 Gammarus b., Catta in: Bull. Soc. Borda | 1896 @.b., Chevreux in: Bull. Soe. zool. France, v.21 p.29 f. | 1899 Echinogammarus b., T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.429 | 1893 Gammarus barilloni, A. Della Valle in: F. Fl. Neapel, v.20 p. 765. Form of body nearly as in Gammarus pulex (p. 474). Peraeon seg- ment 7 sometimes with dorsal spines; pleon segments 1—3 with dorsal spines in great numbers mingled with setae (only with setae in one J spe- cimen (Chevreux)); 30—50 spines on segment 2, 4—8 dorsal spines on segment 4, 2—4 on segment 5, 2 or 3 on segment 6. Head, post-antennal angles acute. Pleon segment 3, postero-lateral corners acute. Eyes large, reniform. Antenna 1 not much longer than antenna 2, 1° joint not much longer than 24, flagellum 25—30-jointed, accessory flagellum with 6 very short joints. Antenna 2, ultimate and penultimate joints of pedunele long, subequal, flagellum shorter than both combined, without calceoli. Gnathopod 1, 6th joint oval, palm oblique, scarcely distinet from hind margin. Gnathopod 2 . in both sexes much larger than gnathopod 1, in S 6% joint of the same shape as in gnathopod 1, in Q more vblong, palm well defined from hind margin, emar- ginate in the centre. Peraeopod 1 strongly setose on hind margin, setae much longer than on peraeopod 2. Peraeopods 3—5 shorter and more robust than in Gammarus pulex, with fascicles of long setae. Uropod 3, outer ramus very elongate, with long setae and fascieles of spines on the margin, 24 joint obsolete, inner ramus not '/, length of outer, carrying a few setae and an apical spinule. Telson broader than long, lobes divergent, each with 2 spines and many setae at narrowly truncate apex, and usually with 1 spine on outer margin. Colour greenish brown or reddish brown. L. O0 7 mm, d 10—12 mm. Pyrenees, to a height of 750 m; Jersey. Streams. 2. E. verrucosus (Gerstf.) 1858 Gammarus v., Gerstfeldt in: M&m. pres. Ac. St.-Petersb., v.8 p.282 | 1862 @. v., Bate, Cat. Amphip. Brit. Mus., p.219 1.39 £.1 | 1874 @. v., B. Dybowsky in: Horae Soe. ent. Ross., 0.10 suppl. p.67 t.4 f.12]| 1888 @. v., T. Stebbing in: Rep. Voy. Challenger, v.29 p.309 | 1899 Echinogammarus v., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 429 | 1898 Gammarus pungens (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.768. Pleon segments 1—6 (Fig. 89) pectinate with rows of spinules on rather obliquely set ridge-like or tubercular dorsal prominences, usually forming 3 transverse series (spines 54) on segment 1, 5 series (spines 89) on segment 2, 5 series (spines 100) on segment 3, 2 series on each of segments 4—6 (spines 32, 24, 12). Pleon segment 3, postero-lateral corners approximately quadrate (produced into long upturned tooth, Bate, but?). Eyes flat, Fig. 89. almost linear reniform, black. Antenna 1 not much longer than eh ger eaiz . antenna 2, flagellum 35—59-jointed, accessory flagellum 4—10-. pleon. [After jointed. Antenna 2, flagellum 15—26-jointed, short, broad, flattened, #- Pybowsky.] with calceoli in both sexes. Gnathopods 1 and 2, 6% joint tolerably roundish- triangular (authors’ accounts differ). Peraeopods 3—5, 24 joint moderately Das Tierreich. 21.Lief.: T. R.R. Stebbing, Amphipoda I. 31 482 Echinogammarus expanded, hind margin slightly sinuous, not produced. Uropods 1 and 2 short. Uropod 3 long, outer ramus 6 or 7 times as long as the inner, with spines and fascicles of long setae on both margins. Telson (Fig. 89) as in. E. berilloni (p. 481). Colour greenish to yellowish, with a narrow brownish stripe on hind margin of each segment. L. reaching 43 mm. Lake Baikal, River Angara. 3. E. saphirinus (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.98 | 1899 Echinogammarus s., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 930. o unknown. — d. Peraeon segment-7 with 2 little groups of 2 or 3 spines on hind margin; pleon segments 1—6 each with dorsal spines in 2—4 groups adjoining hind margin, spines 18—22 on segment 1, 18—24 on segment 2, 18—20 on segment 3, 6—12 on segment 4, 8—6 on seg- ment 5, 4 on segment 6. Eyes irregularly reniform, long, narrow, upper end a little emarginate, reaching high on top of head, reddish, invisible in spirit. Antenna 1 nearly as long as body, thrice as long as antenna 2, flagellum 87-jointed, accessory flagellum 8-jointed. Antenna 2, flagellum 16-jointed. Gnathopod 1, 6th joint piriform, larger than the oblong 6!" joint of gnathopod 2. Peraeo- pods 3—5, 24 joint broad, hind margin convex, carrying 8—10 short setae, lower corner projecting. Uropods 1 and 2 short, but uropod 1 reaching as far back as tbe short uropod 3, in which the inner ramus is about °/, as long as outer; both earıying a few simple setae. Telson not described. Colour a very delicate sapphire-blue L. 18 mm. Lake Baikal. Depth 300 m. 4. E. ezerskii (Dyb.) 1874 Gammarus c., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.94 t.1 f.2; 1.3 f.8 | 1899 Echinogammarus c., T. Stebbing in: Tr. Linn. Soe. London, ser.2 ©.7 p.429 | 1898 Gammarus pungens (part.)?, A. Della Valle in: F. Fl. Neapel, ©.20 p. 928. Pleon segments 1—6 with regular little pectinate groups of spines on weak elevations scarcely oblique to the adjacent hind margin, on segment 1 usually 4 groups (2 median, 2 lateral), each with 3 or 4 spines, on segments 2 and 3 a row of4 groups, preceded by 2 or 3 rows consisting each of 2 groups, on segment 4 a row of 3 groups, preceded by a row of 2 groups, on seg- ments 5 and 6 a row of 3 groups. Each group has usually 3 or 4 spines, sometimes on segment 6 only 1 or 2. Eyes long reniform, widened below, black. Antenna 1 longer than the body, 1° joint rather shorter than 24, and only half as long as ultimate joint of peduncle of antenna 2, flagellum 90-jointed, accessory flagellum 7—-10-jointed. Antenna 2, ultimate joint of peduncle rather longer than penultimate, flagellum 20—28-jointed. Gnatho- pod 1, 6% joint piriform, much larger than the narrowly oblong 6th joint ofgnatho- pod 2. Peraeopods 3—5, 24 joint narrow, hind margin slightly convex, lower angle very shortly produced. Uropods 1 and 2 long, uropod 1 reaching the first or even the last quarter of uropod 3. Uropod 3 very long, easily detachable, ?°/, as long as body, outer ramus 9 times as long as inner, slightly bent, rind with long, simple setae. Colour, red above, violet below, appendages violet. L. about 28 mm. Lake Baikal. Depth 5—8 m. VE TPERT WW Echinogammarus 483 5. E. maackii (Gersif.) 1858 Gammarus m., Gerstfeldt in: M&m. pres. Ac. St.-Pötersb., v.8 p.283 | 1862 @. m., Bate, Cat. Amphip. Brit. Mus., p.217 t.38 f.8| 1874 G. m., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.97 | 1888 G. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.309 | 1899 Echinogammarus m., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.429 | 1893 Gammarus pungens (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 764. Pleon segments 1—6 with spines Bee arranged on ridges; on segment 1 are 2 oblique lateral ridges, each with 5—8 spines, on segments 2 and 3 the lateral ridges are longer, each with 7 or 8 spines commonly divided into two sets, of which the front is smaller than the hinder, also there are often 2 little median humps, or on segment 3 two pairs of them, each with 2 or 3 spines; segments 4—6 have the ridges short, each with 3—6 spines, and 2 little median humps, each with 1 or 2 spines. Eyes narrowly reniform, black. Antenna 1 about °®/, as long as body, 1° joint shorter than ultimate joint of pedunele of antenna 2, flagellum 40—54-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, flagellum 14—17-jointed. Gnathopods 1 and 2, 6% joint piriform, larger in gnathopod 1 than in gnathopod 2 (authors’ accounts differ). Peraeopods 3—5, 24 joint moderately broad, hind margin sinuous, ending in blunt, little projeeting corner. Uropod 1 reaching end of pedunele of uropod 3. Uropod 3 long, '/, as long as body, distinguished by paueity of setae, which are short and scattered, inner ramus scarcely */,, as long as outer. Colour, body green, appendages red. L. about 28 mm. River Angara at Irkutsk; Lake Baikal, depth !/s,—2 m. | 6. E.lividus (Dyb.) 1874 Gammarus l., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.68 t.6 f.1 | 1899 Echinogammarus I., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus pungens (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Pleon segments 1—6 with spines, segment 1, hind row in 4 groups, each with 4—6, front in 2 groups, each with 4 spines; segment 2, hind row as in segment 1, preceded by 3 rows, each forming 2 widely separated groups; segment 3 like segment 2, but with occasional addition of some intermediate groups; segment 4, hind row with a middle and 2 lateral groups, front with 2 middle and 2 lateral groups; segments 5 and 6 each with a middle and. 2 lateral groups in 1 row. Eyes flat, long reniform, below a little widened and truncate or slightly emarginate, black. Antenna 1 about °/, as long as body, peduncle shorter than peduncle of antenna 2, 1% joint rather shorter than 24, flagellum with 46—60 joints in Q, 52—70 in ÖS, accessory flagellum 5—9-jointed. Antenna 2, ultimate joint of peduncle slightly longer than penultimate, flagellum shorter than both combined, with 6—20 joints in Q,16—26 in J, carrying calceoli in both sexes. Gnathopod 1, 5th joint as broad as long, about °/, as long as the narrowly piriform 6tk, Gnathopod 2, 5!k and 6 joints together as long as those of gnathopod 1 but much narrower, 5!" joint ?/, as long as the narrowly oblong 6, which has a short, well defined, almost truncate palm. Peraeopods 3—5, 24 joint moderately broad, hind margin slightly convex or sinuous, ending often in a minutely produced angle. Uropod 1 reaching '/, ofuropod 3, which is rather long, outer ramus 6 or 7 times as long as inner, with spines and fascieles of long simple setae on both margins. Telson (in figure) much longer than broad, each lobe with a spine high up on outer margin and 3 spines on the narrow apex. Colour violet-blue or greenish violet, often with metallie glance, antennae 1 and 2 and uropod 3 red or violet-brown. L. 40 mm. Lake Baikal. Depth 1—10 m. 31* 484 Echinogammarus 7. E. viridis (Dyb.) 1874 Gammarus v. + @. v. var. canus + @. v. var. olivaceus, B. Dybowsky in: Horae Soc. ent. Ross., o. 10 suppl. p.95 t.6 f.2; p.95 t.5 f.3, t.4 £.4; p-95 | 1899 Echinogammarus v., T. Stebbing in: Tr. Linn. Soc, London, ser.2 0.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 931. Pleon segments 1 and 2, spines usually arranged in 2 groups close to hind margin (wanting on segment 1 in var. canus, and on both segments in var. olivaceus); segment 3, spines in 2—4 transverse series, on the hind- most forming oblique lateral groups, but middle groups almost parallel to the hind margin, in the front rows middle groups sometimes wanting; segment 4, spines in 1 or 2 series, consisting each of 2 middle and 2 lateral groups; segments 5 and 6 each with only 1 such row. The ridges or humps generally feeble, in young specimens scarcely indieated; number of spines in each group variable, encreasing with age. Eyes reniform, black. Antennae 1 and 2, gnathopods 1 and 2 and peraeopods 3—5 differing little from those of E. lividus (p. 483), but antenna 1, accessory flagellum 4—6-jointed, antenna 2, ultimate joint of peduncle more deeidedly longer than penultimate, gnatho- pod 1, 6!" joint thrice as long as 5t#, the 2 combined longer than 5t" and 6th of gnathopod 2, which are comparatively wider than in E. lividus, as is also 24 joint of peraeopods 3—5. Antenna 1 comparatively shorter, with fewer joints to the flagellum in the two varieties. . Uropod 1 almost reaches the end of the inner ramus of uropod 3, which is tolerably long, the outer ramus about 3—5 times as long as (figure; in text: '/,—"/, longer than) the inner, carrying marginal spines and simple setae. Telson (in figure) less elongate than in E. lividus. Colour varying from bright grass-green to dark olive-green, appendages red, horn-yellow to horn-brown. L. 24—31 mm. Lake Baikal, shore to 20 m; River Anyara. 8. E. cyaneus (Dyb.) 1874 Gammarus c., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.92.| 1899 Echinogammarus ce., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus pungens (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Pleon segment 1 with 2—6 delicate spinules on hind margin; segment 2 with 6—8 somewhat more conspieuous, but still setiform spines on hind margin; segment 3, whole dorsal surface set with long setae, among which the spines, if present, completely disappear; segments 4—6 less setose, spines stronger, on segment 4 forming 2 middle and 2 lateral groups, on segments 5 and 6, 1 median and 2 lateral groups, number of spines to a group 2—4. Eyes slightly reniform, black. Antenna 1 about ’/, as long as body, flagellum 24—35-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, flagellum 11—13-jointed. Gmathopod 1 piriform, gnathopod 2 oblong. Gnathopod 1 in J longer and broader than gnathopod 2, in © rather broader but not longer. Peraeopods 3—5, 24 joint tolerably broad, hind margin slightly convex, carrying 8—10 short setae, ending in a projeeting acute angle. Uropods1 and 2 about reaching end of inner ramus of uropod 3. Uropod 3 moderately long, outer ramus 3 or 4 times longer than inner, both with simple marginal setae. Colour bluish. L. 18 mm. Lake Baikal. Near the shore, under stones. 9. E. ochotensis (F. Brandt) 1851 Gammarus o., F. Brandt in: Middendorff, Reise Sibirien, 21 p.140 t.6 f.öla—c | 1862 @.o., Bate, Cat. Amphip. Brit. Mus., p. 216 t.38 f.5 | 1899 Echinogammarus o., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1895 Gammarus marinus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.762. Eehinogammarus 485 Pleon segments 1 and 2 more or less elearly furnished in the middle of the hinder dorsal margin with a median forward and 2 lateral hinder u of spinules on low elevations; segment 3 having these preceded by 2 or 3 pairs of similar elevations carrying 4 or 5 spinules each; segments 4 and 5 each with a pair of slightly curved ridges pectinate “with 5 or 6 spines, segment 4 having also 2 smaller lateral elevations with 2 or 3 spines each; segment 6 with a median pair of spines and 3 in a row on each side. Eyes slightly reniform. Antenna 1 about !/, as long as body, rather longer than antenna 2, flagellum 30—32-jointed, much longer than peduncle, accessory flagellum about '/, length of primary. Antenna 2, ultimate and penultimate joints of peduncle long, subequal, flagellum 20-jointed. Gnathopods 1 and 2 subequal, 6b joint moderately convex, almost rhomboidal, palm set with spines, more or less straight truncate (Brandt). Peraeopods tolerably strong, with short setae and spines. Uropod 1 moderately long and broad, reaching about the middle of uropod 3. Uropod 3, outer ramus about twice as long as telson, thrice as long as inner ramus. Telson conical, each lobe with spines on the blunt apex. IL. reaching 25 mm. Ochotsk Bay [Siberia]. 10. E. testaceus (Dyb.) 1874 Gammarus t., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.60 | 1899 Echinogammarus t., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 931. Pleon segment 1 without spines; segment 2 with a pair of lateral groups of 5 or 6 spines each; segments 3 and 4 and often 5 with 2 transverse rows, the hinder eomposed of 2 middle and 2 lateral groups, the front generally only of 2 lateral groups; segments 3—6 or 4 and 5 sometimes having the middle and lateral group on each side coalesced; segment 6 with spines. Eyes narrowly reniform, somewhat widened below, black. Antenna 1 shorter than body, twice as long as antenna 2, flagellum with 32 joints in Oo, t0o50in G, accessory flagellum with 4 joints in 9, to 7 in d. Antenna 2, flagellum with 11 Jeints in 9,t0o 23 in d, carrying calceoli. Gnathopod 1, 6 joint piriform, somewhat larger than the oblong 6! of gnathopod 2. Peraeopods 3—5, 24 joint broad, hind margin convex, ending below with projecting angle. Uropod 1 reaches middle of uropod 3, inner ramus about '/,—?/, as long as the 2-jointed ‘ outer, which has simple setae on its outer margin, but plumose ones also on the inner. Colour dark brownish, passing into greenish, the whole body spotted with yellow or bright greenish. L. Q 12—13, 9 21 mm. Lake Baikal (southern shore). 11. E.sophiae (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.61 | 1899 Echinogammarus s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1895 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 980. Pleon segments 1—3, spines on hind margin in a pair of lateral groups, 2 or 3 spines to a group; segments 4—6 each with only 3 or 4 delicate spinules, 1 or 2 in the median line, and 1 on each side in the place of lateral groups. Eyes small, oval or reniform, black. Antenna 1 nearly ?/, as long as body, 1° joint shorter than 24, flagellum 17—30-jointed, accessory flagellum 3—6-jointed. Antenna 2, flagellum 8—14-jointed, with calceoli. Gnathopods 1 and 2, 6tk joint piriform, larger and stronger in gnathopod 1 than in gnathopod 2, and somewhat tumid at the base. Peraeopods 3—5, 24 joint & a TEEN a TEEN ER RETR ae aa Kae IN FE 486 Echinogammarus slender, - hind margin slightly sinuous, not produced to an angle below. Uropod 1 reaches beyond middle of uropod 3. "Uropod 3, outer ramus about twice as long as inner, with plumose setae on the inner margin, 24 joint very small, hidden among the long terminal spines. Colour yellowish, playing into reddish. L. 0 9—15 mm. Lake Baikal. Depth 200 m. 12. E. fuscus (Dyb.) 1874 Gammarus f., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.63 t.5 f.2 | 1899 Echinogammarus f., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus flwiatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Pleon segments 1—6 with dorsal spines in groups on slight elevations of the hind margin; segments 1 and 2 with 2 middle and 2 lateral groups, each with 4 spines; in all the segments the middle and lateral groups sometimes unite on either side; segments 3 and 4 have an additional cross- row of 2 groups, with variable number of spines. Pleon segments 1 and 2, but not segment 3, having the lateral lobe marked off. Eyes rather small, reniform (in figure widened below), black. Antenna 1 about ?/, as long as body, only a little longer than antenna 2, 1° joint longer than 24 and 34 combined, as long as ultimate joint of pedunele of antenna 2 (in figure; shorter in ‚text), lagellum 30-jointed, accessory flagellum 7-jointed. Antenna 2, flagellum 20-jointed, with calceoli. Gnathopods 1 and 2, 6 joint moderately large, in gnathoped 1 piriform, in gnathopod 2 rather smaller, oblong, but with the palm rather oblique. Peraeopods 3—5, 24 joint rather broad, hind margin convex or somewhat sinuous, ending below in a short, acutely projeeting point. Uropods 1 and 2 reaching middle of uropod 3. Uropod 3, inner ramus !/,— °/, as long as outer, both with simple setae on outer margin, but also plumose setae on inner; 24 joint of outer ramus (in figure) distinct. Telson (in figure) with the lobes narrow, each having 3 spines at apex. Colour violet-brownish, with greenish spots; hind margin of head and front half of peraeon segment 1 brighter coloured; appendages banded. L. J reaching 39 mm. Lake Baikal. Depth 30—100 m. 13. E. murinus (Dyb.) 1874 Gammarus m., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.64 t.5 f.1 | 1899 Echinogammarus m., T. Stebbing in: Tr. Linn. - Soc. London, ser.2 ©.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A: Della Valle in: F. Fl. Neapel, 0.20 p. 929. Pleon segments 1—6 with dorsal spines on low elevations of the hind margin; segmient 1 with 1 cross-row of 2 middle and 2 lateral groups, each containing 4 or 5 spines; segment 2 with 3 eross-rows, the hindmost as in segment 1, but here with 4 spines to a group, preceding row similar or with only 2 middle‘ groups, and the other row generally with only 2 middle groups, spines varying from 1—3 in a group; segment 3 like segment 2, but often with the addition of solitary spinules and simple setae; segment 4 with 2 eross-rows, the spines more delicate, and often giving place to setae; segments 5 and 6 each with 1 cross-row, the lateral groups usually having 4 spines, the median 1 or 2 pairs of setae. Pleon segments 1—3 having the lateral lobes distinetly marked off. Eyes rather large, reniform, widened below and little rounded off, black. Antenna 1 nearly °/, as long as body, 1° joint as long as 24 and 34 combined, and as long as ultimate joint of peduncle of antenna 2, flagellum with 39—53 joints in Q, 57 ind, Echinogammarus 487 accessory flagellum with 12 joints in oO, 10 in d. Antenna 2, ultimate joint of pedunele rather shorter than penultimate, flagellum 28-jointed, with calceoli. Gnathopods 1 and 2 as in E. fuscus. Peraeopods 3—5, 24 joint tolerably broad, but narrower and longer than in E. fuscus. Uropods 1 ' and 2 reaching middle of uropod 3. Uropod 3, outer ramus strong, with ° only simple setae on outer margin, plumose setae also on inner; inner ramus narrow, °/, as long as outer, with plumose setae on both margins. Telson elongate, (in figure: each lobe with 1 spine high up on outer margin, 1 low down on inner, 3 on narrow apex). Colour bright violet-brownish or dark grey, with bright olive-green spots, appendages banded. L. about 23 mm. Lake Baikal. Depth 30—100 m. 14. E. aheneus (Dyb.) 1874 Gammarus a. + @. a. var. setosus + @. a. subvar. miniatus + G. a. subvar. succineus, B. Dybowsky in: Horae Soc. ent. Ross., e.10 suppl. p-65, 66; t.7 £.1, 2; t.6 £.3 | 1899 Echinogammarus a., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus calcaratus (part.)?, A. Della Valle in: .F. Fl. Neapel, v.20 p. 927. Pleon segments 1—6 armed with spines, varying in number and arrange- ment; segment 1 with 1 or 2 cross-rows of spines, segment 2 with 2—4 eross-rows, segment 3 with 4 or 5, segment 5 with 1 or 2, segment 6 with 1 eross-row of spines; segment 4 not specified. Besides the spines oceur setae, which sometimes take the place of the spines or conceal them. Pleon segments 1—3 having the lateral lobes distinetly marked off; also on lower margins of side-plates there are usually setae, few or whole faseicles.. Eyes reniform or biseuit- shaped, often slightly widened below, black. Antenna 1 nearly or quite as long as body, 1° joint little or not longer than 24, 34 not very short, flagellum 41—116-jointed, accessory flagellum 7—13-jointed. Antenna 2, ultimate joint of peduncle long, longer than penultimate, flagellum 20—33-jointed, with calceoli. Gmathopod 1, 6®% joint piriform, larger than the oblong 6th of gnathopod 2. Peraeopöds 3—5, 24 joint moderately broad, hind margin slightly convex or somewhat concave, ending below in a little angle. Uro- pod 1 not reaching middle of uropod 3. Uropod 3 long and strong, outer ramus 2-jointed, more than twice as long as inner, slightly curved inward, with only simple setae on outer margin; inner ramus with faseieles of simple setae interspersed with plumose ones on its margins. Telson (in figure) as in E. murinus. Colour red or-yellow. L. reaching about 37 mm. Lake Baikal. Depth 50—500 m. 15. E. sarmatus (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.86 t.1 f.3; t.8 f.4 | 1899 Echinogammarus s.. T. Stebbing in: Tr. Linn. Soc. London, ser.2 0.7 p.429 | 1893 Gammarus flwviatilis (part.), A. Della Valle in: F. Fl. Neapel, ®.20 p. 930. Q unknown. — C. Peraeon segment 7 and pleon segments 1—6 with dorsal spines, forming a single cross-row on hind margin, formed of 2 lateral groups with 2—5 spines in each, and 2 middle groups with 1—4 spines in each. Eyes retort-shaped, almost pointed above, concave in front, the widened lower part with lower margin slightly concave, white, becoming rosy on exposure. Antenna 1 longer than body, 1° joint long, 24and 34 successively a little shorter, flagellum thrice as long as pedunele, 130-or 131-jointed, accessory flagellum 39-jointed. Antenna 2 very little shorter than antenna 1, ultimate joint of peduncle longer than penultimate, flagellum 110—115-jointed, twice as long as peduncle. All the legs long — 488 Echinogammarus and delicate. Gnathopods 1 and 2, 6tk joint not large, piriform (in figure of gnathopod 2, 6! joint oblong, with a very oblique palm), the 5tk joint in both gnathopods rather elongate; gnathopod 2 rather smaller than gnatho- pod 1. Peraeopods 3—5, 24 joint slender, twice or (figure) more than twice as long as broad, the expansion forming a little lobe at top. Uropods 1 and 2 with rami longer than peduncle, almost reaching as far as end of the long uropod 3. Uropod 3, outer ramus with 1° joint twice as long as peduncle, 24 joint nearly '/, as long as 1°, inner ramus not much shorter: than 1° joint of outer, both with numerous plumose setae on both margins. Colour white or faintly flesh-toned, on exposure becoming more rosy. I. about 42 mm. Lake Baikal. Depth 1300 m. 16. E. capreolus (Dyb.) 1874 Gammarus ec. + @. ce. var. chloris, B. Dybowsky in: Horae Soe. ent.Ross., v. 10 suppl. p.87 t.11f.1 | 1899 Echinogammarus capreolus, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.), A.Della Valle in: F. Fl. Neapel, v.20 p. 928. Peraeon segment 7 and pleon segments 1—6 with dorsal spines; on. peräeon segment 7 and pleon segments 1—3 the spines are very delicate, oceupying the hind margin in too close a row to be separated into groups; on segments 4—6 they form 2 lateral groups, each with 2—5 spines, and 2 middle groups, each with 1—3 spines. Eyes rather large, slightly reniform, wider below than above. Antenna 1 longer than the body, 1° joint stout, nearly as long as 24 and 34 combined, flagellum 9—20 times as long as peduncle, 64—95-jointed, accessory flagellum 5—10-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, much more slender than 1° joint of antenna 1, flagellum 29—43-jointed, 2 or 3 times as long as peduncle. Legs delicate, long, brittle. Gnathopod 1, 6% joint slenderly ° piriform (oblong in figure); gnathopod 2, 5tl and 6tk joints longer but narrower than in gnathopod 1, 6!" narrowly oblong, with short transverse palm. Peraeopod 3 only a little shorter than peraeopod 4. Peraeopods 3—5, 24 joint longer than broad, hind margin feebly convex, ending below in a short angle. Uropod 1 longer than uropod 2, reaching end of uropod 3. Uropod 3, outer ramus twice as long as peduncle, its 24 jomt '/, as long as 1*t, inner ramus nearly as long as 1° joint of outer, both with plumose setae on margins. Colour horn-yellow. L. 14—19 mm. — Var. chloris: eyes larger and broader, legs more short and sturdy, 6! joint of gnathopods 1 and 2 stronger and broader, 24 joint of peraeopods 3—5 broader- and shorter, uro- pods 1—3 shorter, colour greenish, spotted with brown. L. 11—15 mm. Lake Baikal. Depth 100—-200 m. 17. E. ussolzewii (Dyb.) 1874 Gammarus ussolzevii, G. ussolzewü, @. ussolzevi + @. ussolzewii var. abyssorum, B. Dybowsky in: Horae Soc. ent. Ross., v. 10 suppl. p. 28, 89, 190 t.9 £.2 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 981 | 1899 Echinogammarus uzzolzewii, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429. Peraeon segment 7 and pleon segments 1—6 with dorsal spines; on peraeon segment 7 hind margin with 2 middle, 2 lateral and 2 marginal groups of 3 or 4 spines each; pleon segments 1—3, spines of the groups more numerous, so as often to form a continuous row on the hind margin, preceded by another row of 4 groups, 2 lateral and 2 marginal, with 3 or 4 spines each; segments 4—6 with 4 groups, containing each 2—4 spines. Eyes tolerably large, narrowly reniform, slightly widened below, black. Antenna 1 er ET WERTET AR 0 EWR Echinogammarus 489 about '/, longer than body, 18 joint stout, 34 not very short, flagellum about 5 times as long as peduncele, joints reaching 200 in number, accessory flagellum 14—17-jointed. Antenna 2 about '/, length of antenna 1, ultimate joint of pedunele longer than penultimate, flagellum rather longer than pedunele, 20—42-jointed. Gnathopods 1 and 2 nearly equally long, gnatho- pod 1 with 6! jomt piriform, gnathopod 2, 6% joint narrowly oblong, with short transverse palm in Q, smaller than Gh joint of gnathopod 1, but in C widening to the oblique palm, and both broader and longer than 6th joint of gnathopod 1. Peraeopods 3—5, 24 joint moderately broad, hind margin slightly convex or sinuous, or nearly straight, ending below with a projecting acute angle. Uropods 1 and 2 reaching end of shorter ramus of uropod 3. -Uropod 3, inner ramus °/,—?/, as long as outer, plumose setae on both margins; outer ramus having them only on its inner margin; its 2 joint distinet. Colour reddish yellow. L. 34 mm. — Var. abyssorum is distinguished by longer extremities, slender 6! joint to gnathopods 1 and 2, longer uropod 3, with relatively shorter. inner ramus, colour bright rose-red or reddish yellow, eyes whitish (becoming dark in spirit) or reddish, and plumose setae on outer margin of outer ramus of uropod 3. L. 41 mm. Lake Baikal. Depth 150—1000 m. . 18. E. stenophthalmus (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soc. ent. Ross., v. 10 suppl. p. 90 | 1899 Echinogammuarus s., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segment 7 and pleon segments 1—6 with dorsal spines on slight ridge-like elevations of the hind margin; on peraeon segment 7 only 2 middle rows, on all the pleon segments 2 middle and 2 lateral, on segments 2 and 3 the spines more numerous than on the others, so as to form a continuous row; Spines in a group 4—-6, rarely 1-3. Eyes narrowly to linear reniform, scarcely widened below, 4 times as deep as broad. Antenna 1 as loug as body, thrice as long as antenna 2, 1° joint thick, almost as long as ultimate joint of peduncle of antenna 2, flagellum more than 4 times as long as peduncle, 121-jointed, accessory flagellum 8-jointed. Antenna 2, flagellum shorter than pedunele, 23-jointed. Gnathopod 1, 6t* joint slenderly piriform. Gnathopod 2, 6'h joint oblong. Peraeopods 3—5, 24 joint rather broad, with convex front and hind margin, the latter ending below in an acute angle. Uropods 1 and 2 reaching about the middle of uropod 3. Uropod 3, outer ramus without plumose setae on outer margin, inner ?/, as long, with plumose setae on both margins. L. over 30 mm. Lake Baikal. Depth 200 m. . 19. E. schamanensis (Dyb.) 1874 Gammarus sz B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.91 | 1899 Echinogammarus s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1895 Gammarus calcaratus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segment 7 and pleon segments 1—6 with dorsal spines, in regular and usually separate groups in 1 eross-row on each hind margin; peraeon segment 7 with2 middle groups, all the rest with 2 lateral and 2 middle groups, the latter eoalescent on pleon segments 4—6, spines 2—6 in middle groups, 3—6in lateral groups. Eyes large and broad, reniform, black. Antennal almost as long as body, peduncle thicker and only a little shorter than that of antenna 2, 3@ joint relatively longer than in nearly related species, flagellum 490 Echinogammarus twice as long as peduncle, 75—84-jointed, accessory flagellum 7- or 8-jointed. Antenna 2 about °/, as long as antenna 1, flagellum shorter than peduncle, 26—35-jointed. Gnathopod 1, 6% joint broad, piriform, gnathopod 2, 6*h joint oblong. Peraeopods 3—5, 24 joint about */, longer than broad, hind margin sinuous, acute lower eorner not prolonged into a tooth. Uropods 1 and 2 reaching about ?/, of uropod 3. Uropod 3, outer ramus without plumose setae on outer margin, inner ramus ?/, as long as outer. Colourreddish yellow. L. about 23 mm. Lake Baikal. Depth 200 m. 20. E.leptocerus (Dyb.) 1874 Gammarus I. + @.l.var. nematöcerus, B.Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.85 t.8f.2; p.85 t.8 f.3 | 1899 Echinogammarus |, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1898 Gammarus fluviatilis «(part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Pleon segments 1-——3 with about 18 dorsal spines in 3 or 4 little groups or in a continuous row on hind margin of each; segments 4—6 with 7—9 spines in 3 groups. Eyes large and broad, irregularly reniform, hind margin uneven and lobed, black. Antenna 1 a little longer than body, nearly thrice as long as antenna 2, 1° joint stout, as long as 24 and 34 combined, flagellum about 6 times as long as pedunele, 43 — 90-jointed, accessory flagellum 4—7-jointed. Antenpa 2, ultimate joint of peduncle slender, longer than penultimate, flagellum a little shorter than pedunele, 11— 18-jointed. Gnathopods 1 and 2, 6% joint rather large, in gnathopod 1 piriform, in gnathopod 2 oblong, in C widening to the palm. Peraeopods 3—5, 24 joint slender, lower hind angle unimportant. Uropod 1 reaching middle of uropod 3. Uropod 3, inner ramus only a little shorter than outer, both with plumose setae on their margins. Colour reddish yellow. L. 14—15 mm. -— Var. nematocerus is distinguished by more slender build of body, longer and more slender legs, flagellum of antenna 2 longer than peduncle, eyes more narrowed above, more numerous setae on uropod 3, and whitish colour. L. 22—23 mm. -Lake Baikal. Depth 150—670 m. 21. E.toxophthalmus (Dyb.) 1874 Gammarus t., B. Dybowsky in: Horae Soe. ent. Ross.. v. 10 suppl. p. 77 | 1899 Echinogammarus t., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, 0.20 p. 931. Pleon segments 1—6 with dorsal spines in a single cross-row of regular groups on low elevations of each segment’s hind margin, 1—3 spines in each of the 2 middle groups, 4—8 in the 2 lateral groups, except on segment 6 where the number is reduced to 2. Eyes long, reniform, much curved, widened below, not widely separated above, black. Antenna 1 about ?/), as long as body, little longer than antenna 2; 1° joint stout, considerably shorter than ultimate joint of peduncle of antenna 2, flagellum about 2"), times as long as peduncle, 45-jointed, accessory flagellum 5-jointed. Antenna 2, flagellum a little shorter than pedunele, 26-jointed. Gnatho- pods 1 and 2, 6t% joint slender, in gnathopod 1 piriform, in gnathopod 2 oblong. Peraeopods 3—5, 24 joint moderately broad, hind margin almost straight, ending below in a shortly projecting angle. Uropod 1 reaching nearly the end of uropod 3. Uropod 3, inner ramus about '/, shorter than outer, both with plumose setae on both margins. Colour clear violet. L. 20 mm. Lake Baikal. Depth 120 m. Eehinogammarus 491 22. E. vittatus (Dyb.) 1874 Gammarus v., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p. 82 | 1899 Echinogammarus v., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1898 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 931. Pleon segment 1 with dorsal spines in a single eross-row formed by 2 quite small lateral groups and 2 middle spines, which seem to stand immediately - ‚on the dorsal surface; segment 2 with 3 cross-rows, the front one composed of 2 middle groups, the next and the one on the hind margin of 2 middle and 2 lateral groups, each containing 4 or 5 spines; segment 3 like segment 2, but with addition in front of 2 little groups on the median line; segment 4 with 2 cross-rows, the front one composed of 2 middle groups, the hinder of 2 middle and 2 lateral groups, having 2—5 spines in each; segments 5 and 6 each with 1 cross-row formed by 2 middle and 2 lateral groups. Eyes moderately large, reniform, black. Antenna 1 not '/, as long as body, 2/,—"/, longer than antenna 2, flagellum not twice as long as peduncle, 33—39-jointed, accessory flagellum 5- or 6-jointed. Antenna 2, flagellum shorter than peduncle, 12—15-jointed.. Gmathopod .1, 6% joint slenderly piriform, somewhat larger than oblong 6% joint of gnathopod 2. Peraeopods 3—5,"24 joint moderately broad, hind margin prolonged below in an obtuse angle, the margin convex in peraeopod 3, a little sinuous in peraeopods 4 and 5. Uropod 1 reaching end of shorter ramüs of uropod 3. Uropod 3 moderately long, inner ramus ?/,—?/, as long as outer, both fringed with numerous faseicles of setae, and both having among the simple setae of the fascicles on the inner margin plumose setae. Colour bright yellow green, or bright olive-green, each segment with a narrow stripe of brown on hind margin, antennae brown, with narrow greenish bands. L. 23 mm. Lake Baikal. Under stones. 23. E. petersii (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.83 t.10 f.1] 1899 Echinogammarus p., T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.429 | 1893 Gammarus calcaratus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segment 7 very rarely having a couple of delicate spinules on the hind margin; pleon segments 1—6 each with 1 cross-row of dorsal spines, on segments 1—3 forming 6 groups, 2 middle, 2 ‚lateral and 2 marginal, on segments 4—6 only 4 groups, 3—5 spines in a group; exceptionally some delicate isolated dorsal spinules occur on segments 2 and 3. Head with slightly convex upper outline. Eyes moderately large, reniform,' a little widened below and narrowed above, white, difficult to make out in spirit, not darkening with exposure to light. Antenna 1 thrice as long as body, 5 times as long as antenna 2, extremely brittle, 1° jomt stout, longer than 24 and 34 combined, shorter than ultimate joint of peduncle of antenna 2, flagellum never found complete, 17 times as long” as pedunele, at least 350-jointed, accessory flagellum fully as long as peduncle, 16-jointed. Antenna 2, ultimate joint of peduncle slender, much longer than penultimate, flagellum longer than pedunele, 27—-57-jointed. Legs delicate. Gnathopod 1, 6'% joint piriform. Gnathopod 2, 6! joint oblong. In figures gnathopod 1 in © has the 6th joint shorter, broader and with longer hind margin than in S, and gnathopod 2 in C' has the 6'k widening to the palm much more than in O, and consequently with a longer palm and longer finger. Peraeopods 3—4 (5?), 24 joint moderately broad, hind margin little convex, ending below with a weakly projeeting angle; 24 joint of peraeopod 5 (in figure) narrow, its breadth greatest at top, equalling only '/, of its length, the 492 Eehinogammarus hind margin almost straight, ending below in a little obtuse point. Uropods 1 and 2 reaching end of shorter ramus of uropod 3. Uropod 3 long, inner ramus about ?/, as long as outer, of which the 24 joint is well developed, 1, as long as 1° joint; both rami with plumose setae on both margins. Colour delicate, clear violet or reddish white. L. about 29 mm. Lake Baikal. Depth 700 --1300 m. 24. E. violaceus (Dyb.) 1874-Gammarus v. + @.v. var. virescens, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.75 t. 10 f.3; p.76 t.12 f.5 | 1899 Echinogammarus violaceus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus calcaratus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 931. Pleon segments 1—6 each with 1 eross-row of dorsal spines on the hind margin pectinately set on ridge-like elevations in 2 middle groups with 3—5 spines each, and 2 lateral groups with 4—7 spines each. Head, rostral point short and rounded. Eyes small, reniform, slightly widened below, black. Antenna 1 in J as long as body, more than twice as long as antenna 2, 1° joint not greatly longer than 24,'nor 24 than 34, flagellum about 4 times.as long as pedunele, 9L—148-jointed, accessory flagellum 7- or 8-jointed. Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum shorter than peduncle, 18—-25-jointed. Gnathopod 1, 6% joint broad, piriform. Gnathopod 2, 6tk joint slender, oblong. In figure gnathopod 1 has StR joint as broad as long, 6! joint twice as long as 5t", broadly oblong oval; gnatho- pod 2 has 5tk joint long and narrow, not much shorter than the 6!", the 2 combined being much longer than the much broader 5t" and 6!" of gnathopod 1 combined. Peraeopods 3—5, 24 joint broad, in peraeopod 5 heart-shaped, about '/, longer than broad, hind margin convex, prolonged below into a short angle. Uropods 1 and 2 short, reaching almost ”/, length of uropod 3. Uropod 3, inner ramus about °/,—'/, shorter than outer, with plumose setae on both margins, while the outer ramus has them only on the inner. Colour dark violet-red or brownish red, appendages brightly banded. L. reaching 37 mm. — Var. virescens distinguished by smaller eyes, shorter uropod 3, broader 24 joint to peraeopods 3—5 and a smaller number of spines. Lake Baikal. Depth 20-—-100 m. 25. E. ibex (Dyb.) 1874 Gammarus i., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.78 | 1899 Echinogammarus i., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Pleon segments 1—6 each with 4 groups of dorsal spines on very slight elevations of the hind margin, the 2 middle groups with 1—3 spines each, the lateral groups with 4—8. Head, frontal line almost straight. Eyes large, broad, reniform, slightly widened below, not far apart above, black. Antenna 1 longer than body, twice as long as antenna 2, 1°t joint stout, shorter than ultimate joint of pedunele of antenna 2, flagellum 5 times as long as peduncle, 73—80-jointed, accessory flagellum 8-jointed. Antenna 2, flagellum shorter than peduncle, 24—30-jointed. Gnathopods 1 and 2, 6'k joint moderately large, in C slightly widening to the palm, in gnathopod 1 piriform, in gnathopod 2 oblong. Legs delicate and thin. Peraeopods 3—5, 24 joint not broad, front margin carrying long setae, the feebly convex hind margin 10—16 short setae, and ending in a short projeeting angle. Uropods 1 and 2 long, but scarcely reaching middle of uropod 3. Uropod 3 in G almost !/, as long as body, outer ramus about "/, longer than inner, both having plumose setae on both margins. Colour uniform yellow, or with horn-yellow markings. L. 14 mm. Lake Baikal. Depth 150—200 m. a ee Ey a a NE ara SEE BR Echinogammarus 493 26. E. parvexii (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.81 t. 10 f.2 | 1899 Echinogammarus p., T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.429 | 1898 Gammarus ealcaratus (part.)?,.A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Pleon segments 1—6 each with 4 groups of dorsal spines on elevations ‚of the hind margin, the middle groups each with 1 or 2 spines, the lateral each with 2—4. Eyes tolerably large, biscuit-shaped or reniform, wide apart above, black. Antenna 1 nearly twice as long as body,thrice as long as antenna 2, 1° joint not as long as 24 and 3% combined, flagellum 7—9 times as long as the thin peduncle, 310-jointed, accessory flagellum 17-jointed. Antenna 2, ultimate joint of pedunele longer than penultimate, flagellum shorter than peduncle, 26-jointed. Gnathopod 1, 5tk joint as broad as long, 6!% very broadly piriform, the basal half tumid, finger strongly curved. Gnathopod 2, 6!" joint long and narrow, palm short, almost transverse. Peraeopods 3—5, PX joint narrow, in figure of peraeopod 5 more than twice as long as broad, hind margin flatly concave, produced to a subacute point. Uropods 1 and 2 long, reaching nearly the middle of uropod 3, rami longer than pedunele. Uropod 3, outer, ramus without plumose setae on outer margin, 24 joint between ’/, and '/, as long as 1°, inner ramus ?/, as long as 1° joint of outer. Colour orange- yellow. L. about 25 mm. Lake Baikal. Depth 170 m. 27. E. polyarthrus (Dyb.) 1874 Gammarus longicornis (non J. C. Fabricius 1779!) + @. I. var. p., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.79; p. 80 t.10 f.2b‘, e‘ | 1899 Echinogammarus p., T. anne in: Tr. Linn. Soc. London, ser. 2 v.7 p.429 | 1893 Gammarus ealcaratus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Pleon segments 1—6 each with 4 groups of dorsal spines on ridge- like elevations of the hind margin, the 2 middle groups each with 2—4 spines, the lateral with 2—6, except on segment 6, where there are only 4 spines for the 4 groups; also on segments 4 and 5 the middle groups are weakly developed. Eyeslarge, little deeperthan broad, reniform, slightly widened below, narrowedabove, black orreddish. Antennal in S longer than the body, 3—4times aslong as antenna 2, flagellum 5—8 timesas longas the stout peduncle, 250-— 340- jointed, accessory flagellum 16-jointed. Antenna 2, ultimate joint of peduncle longer than 1% joint of antenna 1, flagellum shorter than peduncle, 25—29- jointed. Gnathopod 1, 6% joint piriform base not tumid. Gnathopod 2, 6'% joint oblong. Peraeopods 3—5, 24 joint not very broad, hind margin flatly concave, ending in a short, projecting point. Uropods 1 and 2 reaching middle of uropod 3. Uropod 3, inner ramus about ?/, length of outer, both with plumose setae on both margins. “Colour brighter or darker reddish yellow. L. 32 mm. Lake Baikal. Depth 170—700 m; the so-called variety, from 300—700 m. E. mutilus (Abildg.) 1789 Gammarus m., Abildgaard in: O. F. Müller, Zool. Dan., ed.3 v.3 p.60 t.116 f.1—11 | 1888 @. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.56 | 1798 Cancer (Gammarellus) m., J. F. W. Herbst, Naturg. Krabben Krebse, v.2 p.120 1.35 f.7 | 1893 Gammarus locusta (part.), A. Della Valle in: F. Fl. Neapel, v.20 pP. 759. Peraeon segment 7 and pleon segments 1—3 furnished dorsally with backward directed spines on hind margin.. Antennae 1 and 2 subequal, flagellum long in both. Accessory flagellum of antenna 1 very long, 24-jointed. Pedunele of antenna 2 reaching beyond that of antenna 1. Uropod 3, peduncle short, rami rather long, nearly equal, fringed with long setae. North-Atlantie (Farö Isles).. On the shore. a ae a ae Se ne 494 Heterogammarus 47. Gen. Heterogammarus Stebb. 1899 Heterogammarus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 0,7 p. 429. In general like Gammarus (p. 460), without dorsal teeth or carinae, or notable processes of head or side-plate 1, with accessory flagellum of antenna 1 more than l-jointed, uropod 3, outer ramus with 2 joints, and telson cleft; but separated from Gammarus by one or more of the following characters: peduncle of antenna 1 longer than peduncle of antenna 2, 6®% joint of gnatho- pod 1 larger than 6tk joint of gnathopod 2, uropod 1 very short. 8 species. Synopsis of species: 1 Uropod 3 long, '„—!/ı as long as body — 2. Uropod 3 not long, !/ır—"!/ıo as long as body — 5. 2 Antenna 1 shorter than antenna 2... ..... 1. H. stanislavii. . p.494 Antenna 1 longer than antenna 2 — 3, & 3 Peraeopod 5, 2d joint with well developed wing . 2. H. sophianosii . p.494 Peraeopod5, 2d joint with wingscarcely developed —4. 4 Uropod 3, inner ramus about ®/s as long as outer 3. H. capellus. . . p.495 Uropod 3, inner ramus scarcely !/ı as long as outer 4. H.ignotus . . . p.495 Gnathopod 1, 6th joint larger than that of Ä 5 | gnathopod 2 — 6. | Gnathopod 1, 6th joint subequal to that of gnathopod 2 — 7. 6 Peraeopods 3 and 4, 2d joint broad. . . .... bh: BE Berl. 2.5: 2498 Peraeopods 3 and 4, 24 joint narrow . ..... 6. H. albulus . . . p.496 - Antenna 1 half as long as body . . ...... 7. H. bifasciatus . p.496 Antenna 1 4a as long as body...» 2.2.2. 8. H. branchialis . p. 497 1. H. stanislavii (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.58 | 1899 Heterogammarus s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus stanislavi, @. pungens (part.)?, A. Della Valle in: F, Fl. Neapel, v.20 p. 930. Juv. Only pleon segments 4—6 carrying spines, these situated on 3 slight elevations of the hind margin, the median with 2 or 3, the lateral each with l or 2 spines. Head, rostrum obsolete. Side-plates small and low. Pleon segments 2 and 3, postero-lateral corners acute. Eyes broadly reniform, slightly widened below, black. Antenna 1 only about ®/, as long as antenna 2, peduncle shorter and thinner than peduncle of antenna 2, flagellum 25-jointed, accessory flagellum 5- or 6-jointed. Antenna 2 about half as long as body, flagellum 53-jointed. Gmathopod 1, 6" joint piriform, widened at base, larger than 6% joint of gnathopod 2, which is also piriform, but not specially widened at base. Peraeopods 3—5, 24 joint rather slender, somewhat expanded proximally. Uropod 1 reaching beyond uropod 2, to the end of inner ramus of uropod 3. Uropod 3 long, '/, as long as body, outer ramus 4 or 5 times as long as inner, with plumose setae only on inner margin, inner ramus having them on both margins. Colour bright reddish yellow. L. 18—20 mm. Lake Baikal. Depth 100 m. 2. H. sophianosii (Dyb.) 1874 Gammarus s. + @.s. var. scirtes, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 101 t.10 £.4; p.102 t.11 f.2 | 1899 Hetero- gammarus sophianosi, T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fi. Neapel, v.20 p. 980. Heterogammarus 495 Pleon segments 4—6 with few, delicate spines on hind margin, other segments without dorsal armature. Head, rostrum obsolete. Eyes not large, little prominent, reniform, black. Antenna 1 half as long as body, twice as long as antenna 2, pedunele not thicker and very little longer than peduncle of antenna 2, flagellum 46—50-jointed, accessory flagellum 7- or 8-jointed. Antenna 2, flagellum not longer than ultimate joint of peduncle, 10- or 11-jointed. Gnathopods 1 and 2 in J, 6%" joint piriform, in © that of gnathopod 1 piriform, that of gnathopod 2 oblong, apparently the difference of size being slight, and the palm in all cases very oblique. Peraeopods 3—5, 24 joint heart-shaped, hind margin of wing carrying a few short setae, and . ending below without forming a free corner. Uropods 1 and 2 reaching almost the middle of uropod 3. Uropod 3 '„—!/, as long as body, inner ramus nearly as long as outer, both fringed with numerous plumose setae. Colour olive-green or brownish, with delicate brown or dark red markings. L. 41—46 mm. — Var. scirtes is distinguished especially by the liveliness of its walking and hopping. L. 12:5 mm. Lake Baikal. Depth 1—50 m; on sandy coasts. 3. H. capellus (Dyb.) 1874 Gammarus c., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.100 | 1899 Heterogammarus c., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. ; Pleon segments 4—6 usually with 3 little groups of spines on the hind margin, 1 or 2 spines in each group, other segments without dorsal armature. Head, rostrum a feeble point. Eyes slightly prominent, reniform, black. Antenna 1 rather longer than the body, 4 times as long as antenna 2, peduncle stouter and longer than peduncle of antenna 2, flagellum 46—52- Jointed, accessory flagellum 4-jointed. Antenna 2, flagellum 8- or 9-jointed. Gnathopod 1, 6! joint slenderly piriform, equal to the oblong 6 joint of gnathopod 2. Peraeopods 3—5, 24 joint narrow, heart-shaped. Uropod 1 reaching middle of uropod 3, uropod 2 scarcely reaching end of peduncle of uropod 3. Uropod 3 about '/, as long as body, inner ramus about ?/, ' a8 long as outer, both fringed with plumose setae. Colour reddish yellow with scattered reddish brown spots. L. about 13 mm. Lake Baikal. Depth 100 m. 4. H.ignotus (Dyb.) 1874 Gammarus i., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 109 t.4 f.3 | 1899 Heterogammarus i., T. Stebbing in: Tr. Linn. Soe. London, ser.2 0.7 p.429 | 1893 Gammarus pungens (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 929. Surface of body dorsally hairy or carrying scattered, short setae; only on hind margin of.pleon segments 4—6 there are somewhat longer and stouter setae. Eyes punctiform, white, in spirit not visible. Antenna 1 longer than half the body, fully twice as long as antenna 2, pedunele longer than peduncle of antenna 2, flagellum 24-jointed, accessory flagellum 3-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum 9- or 10-jointed. Gmnathopod 1, 6% joint piriform, broader but shorter than the narrowly oblong 6% joint of gnathopod 2; 5tk joint also shorter in gnathopod 1. Peraeopods 3—5, 24 joint narrow, the wing in no part broad, distally almost evanescent. Uropod 1 reaching nearly middle of uropod 3. Uropod 3 '/, as long as body, outer ramus with 24 joint well developed, inner about !/, as long as outer, both with isolated simple setae, but without plumose setae. Colour white. L. about 10 mm. Lake Baikal. Depth 800 m. 496 Heterogammarus 5. H. flori (Dyb.) 1874 Gammarus f., @. floriü, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.20,52; 54, 188 | 1899 Heterogammarus flori, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus flwviatilis (part.)?. A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Pleon segments 3 and 4 with dorsal fascieles of long setae, segments 5 and 6 each with 4 or 5 groups of spines, usually 5 spines in each of the oblique lateral groups. Eyes white, in general roundish, small, in spirit not visible. Antenna 1 */, as long as body, less than twice as long as antenna 2, peduncle subequal to that of antenna 2, its 1° joint with only a couple of short setae on front end, flagellum 22—27-jointed, accessory flagellum 3-jointed. Antenna 2, flagellum 7- or 8-jointed. Side-plates low, with 1 or 2 marginal setae. Gnathopod 1, 6% joint broadly oblong, larger than the narrowly oblong 6! joint of gnathopod 2. Peraeopods 3 and 4, 24 joint about */, longer than broad, hind margin slightly sinuous, with short setae in peraeopod 3, long, separate setae in peraeopod 4. Peraeopod 5, 24 joint widened below and produced far downward in a rounded lobe, hind margin with close set setae. Uropods 1 and 2 not reaching end of short uropod 3. Uropod 3 '/,, as long as body, inner ramus about °/, as long as outer, with simple setae on inner margin, outer ramus with them on both margins, each ramus with 4 or 5 apical setae, neither with plumose setae. Colour white. L. nearly 16 mm. Lake Baikal. Depth 50-100 m. 6. H. albulus (Dyb.) 1874 Gammarus flori var. albula, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.53 |'1899 Heterogammarus albulus, T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p. 429. Peraeon segments and pleon segments 1—3 each with 3 groups of spines, 2 spines in the centre group, 3 in each of the oblique lateral groups. Side-plates far lower, pleon segments 4—6 shorter, legs with broader joints than in H. flori; eyes as in that species. Antenna 1 longer than half the body, less than twice as long as antenna 2, peduncle stouter and rather shorter than peduncle of antenna 2, its 1° joint with several strong spines on front end, flagellum 16—24-jointed, accessory flagellum 3- or 4-jointed, shorter than in H. flori. Antenna 2, flagellum 6—8-jointed. Gnathopods 1 and 2, 6th joint oblong, in gnathopod 1 larger than in gnathopod 2, and considerably larger than in gnathopod 1 of H.flori, with 5 or 6 long spines along the palm and 3 still longer on the hind margin. Peraeopod 3, 24 joint twice as long as broad, hind margin feebly convex, without setae. Peraeopod 4, 24 joint 2'/, as long as broad, hind and front margin close set with long setae. Peraeopod 5, 24 joint much narrower above than below, produced far downward in a rounded lobe. Uropods 1 and 2 short, but reaching beyond uropod 3. Uropod 3 "/,, as long as body, inner ramus about °”/, as long as outer, carrying simple setae only at apex, outer having such also on its outer margin. Colour white. L. © 8 mm, d 13 mm. Lake Baikal. Depth 300 m. 7. H. bifaseiatus (Dyb.) 1874 Gammarus b., B. Dybowsky in: Horae Soc. ent. Ross., v. 10 suppl. p. 102 t.12 f.6 | 1899 Heterogammarus b., T. Stebbing in: Tr. Linn. Soc London, ser.2 v.7 p.429 | 1893 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 927. Pleon segments 4—6 each with 2 groups of spinules. Head, rostrum represented by a projecting curve. Eyes not very large, slightly prominent, reniform, ash-grey. Antenna 1 half as long as body, 2 or 3 times as long Heterogammarus, Parapallasea 497 ‚as antenna 2, peduncle stouter and a little longer than pedunele of antenna 2, flagellum 24—29-jointed, accessory flagellum 3-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum 5- or 6-jointed. Gnatho- pods 1 and 2 in J, 6% joint piriform. Gnathopod 1 in Q, 6! joint piriform; gnathopod 2, 6tk joint oblong. Peraeopods 3—5, 24 joint lea broad, in peraeopod 5 scarcely '/, longer than broad, the wing below forming a free, ‚often lobe-like corner. Uropod 1 reaching end of uropod 3. Uropod 3 about !/,, as long as body, outer ramus with 2 spines and 2 simple setae on outer margin, plumose setae on inner; inner ramus very little shorter, with plumose setae on both margins. Colour dark brown, with eross-bands of brighter spots on head and mid-peraeon. L. about 12 mm. Lake Baikal. .Depth "/Ja—2 m, under stones. 8. H. branchialis (Dyb.) 1874 Gammarus b., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p. 110 t.14 f.4 | 1899 Heterogammarus b., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1893 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel,.v.20 p. 927.. Pleon segments 1—3 with a few fine dorsal setae, segments 4—6 each with 2 regular groups of 2 or 3 spines. Head, rostrum a short rounded point. Side-plates 1-—-4 setiferous. Eyes rather large, oval, narrowed below, black. Antenna 1 about '/, as long as body, more than twice as long as antenna 2, pedunele stouter but little longer than peduncle of antenna 2, flagellum 15—17-jointed, accessory flagellum 2-jointed. Antenna 2, ultimate joint of pedunele shorter than penultimate, flagellum 4- or 5-jointed. Gmatho- pods 1 and 2, 6! joint nearly equal, piriform. Peraeopods 3—5, 24 joint tolerably broad, alike in the 3 pairs, hind margin more convex than front, with . widely separated setae, but these often in d wanting on peraeopod 5. Uropods.l and 2 nearly reaching end of uropod 3. Uropod 3 !/,,— "> as long as body, outer ramus with 3—5 fascieles of simple setae on outer margin, 3 pairs of setae on inner; inner ramus about half as long as outer, with 3 pairs of long setae on inner margin. Colour changing with that of the host. L. 9—14 mm. Lake Baikal. Only taken in marsupium of larger Gammarids, or among the branchiae of the males. 48. Gen. Parapallasea Stebb. 1899 Parapallasea, T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 429. Median carina not represented on peraeon or on pleon segments 1—3. Side-plate 4 broader, but not less deep than the preceding, emarginate behind. Antenna 1, flagellum longer than peduncle, accessory flagellum elongate. Peraeopods 3—5 with 24 joint little expanded. Telson deeply cleft. Other characters agreeing with Pallasea (p. 374). 3 species. Synopsis of species: 1 Median carina present on pleon segments 4—6. . . 1. P. borowskii . p. 498 Median carina wanting — 2. 9 | Lateral carinae chiefly composed of tooth-like processes 2. P. lagowskii . p. 498 Lateral carinae chiefly composed of wing-like processes 3. P. puzyllii . . p.498 Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 32 498 Parapallasea 1. P. borowskii (Dyb.) 1874 Gammarus b. + @. b. var. dichrous + @. b. subvar. abyssalis, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.139 t.2 f.3 | 1893 Ceradocus? b., A. Della Valle in: F. Fl. Neapel, «.20 p.927 | 1899 Parapallasea b., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 429. Peraeon and pleon segments with weak marginal swellings, peraeon segments 5—7 and pleon segments 1—6 each with a pair of lateral teeth on hind margin, as a rule pointing backward and outward, not unfrequently’ the first 2 pairs bent uncinately outward or forward; the teeth short, only on pleon segments 1—3 somewhat longer, on pleon segments 4—6 hump- like, each with 3 spinules, and between these humps is a median flat carina with 1 or 2 spinules on the hinder end. Head smooth, upper profile convex, rostrum short. Eyes slightly protuberant, reniform, black. Antenna 1 more than half as long as body, twice as long as antenna 2, 1° joint long, but not as long as 24 and 34 combined, flagellum 52—71-jointed, accessory flagellum 10- or 11-jointed. Antenna 2, flagellum 17—20-jointed. Gmnatho- pod 1, 6% joint piriform. Gmathopod 2, 6 joint oblong, with convex hind margin. Peraeopods 3—5, 24 joint narrowly heart-shaped, in peraeopod 5 twice as long as broad. Uropod 3, outer ramus about '/, longer than inner, both with long stout setae on the margins. Telson broader than long, divided to the base, apices of the conical lobes wide apart, tipped with spinules. Colour bright flesh-red or orange-red, differing in the varieties. L. reaching 56 mm. Lake Baikal. Depth 50 to below 1000 m. 2. P.lagowskii (Dyb.) 1874 Gammarus l., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.140 t.2 £.2 |; 1893 Ceradocus? l., A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1899 Parapallasea 1., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.429. Body laterally compressed, peraeon and pleon segments with marginal swellings, which are much more weakly developed on the pleon, lateral processes thick, on peraeon segments I—5 as outgrowths with their ends directed outward and forward, on peraeon segments 6 and 7 and pleon segments 1—3 as thick, pointed, backward directed teeth, on pleon segments 4—6 as strong humps, each with 4 or 5 spinules. Head feebly convex, rostrum almost flat. Side-plates 1—4 rather deep. Eyes extremely small, almost point-like, white. Antenna 1 more than half as long as body, twice as long as antenna 2, 1% joint long, flagellum 63-jointed, accessory flagellum 10-jointed. Antenna 2, flagellum 22-jointed. Gnathopod 1, 6% joint piriform. Gmnathopod 2, 6! joint oblong, with thickened hind margin. Peraeopods 3—5, 24 joint heart-shaped, in peraeopod 5 nearly thrice as long as broad. Uropod 3, outer ramus about "/, longer than inner. Telson cleft to the base. Colour white or bright flesh-red, often with darker spots. L. reaching 64 mm. Lake Baikal. Depth 800-1300 m. 3. P. puzyllii (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.141 t.3 f.4 | 1893 Ceradocus? p., A. Della Valle in: F. Fl. Neapel, v.20 p.980 | 1899 Parapallasea p., T. Stebbing in: Tr. Linn. Soc. London, ser.2 0.7 p.429. Peraeon segments 1—6 and pleon segments 1—3 each divided into a dorsal compartment, with concave hind margin, and 2 lateral compartments at right angles to the dorsal, the separation effected by a pair of low, wing-like, outward directed, lateral carinae; on pleon segments 4—6 the lateral carinae are tubercular, surmounted by 4 or 5 spinules. Head with the convex upper Surface separated from the sides by obscure lateral carinae, the rostral point small, depressed. Side-plates 1—4 moderately deep. Eyes Parapallasea, Amathillina 499 small, roundish, very prominent, advanced in front of rostrum between antennae 1 and 2, black. Antenna 1 nearly half as long as body, almost twice as long as antenna 2, 1% joint elongate, subequal to 24 and 34 combined, flagellum 40—47-jointed, accessory flagellum 5—7-jointed. Antenna 2, flagellum 14—16-jointed. Gnathopod 1, 6 joint piriform. Gnathopod 2, 6th joint oblong. Peraeopods 3—5, 24 joint elongate, heart-shaped, with rather long remote setae on hind margin. Uropod 3, outer ramus about °/, longer than inner. Telson cleft to the base. Colour red. L. reaching 53 mm. Lake Baikal. Depth 50—500 m. 49. Gen. Amathillina 0. Sars 1894 Amathillina (Sp. typ.: A. eristata) (Amathillinella ©. Grimm in MS.), 6. 0. Sars in: Bull. Ace. St.-Pötersb., ser.5 v.1 p.201. Body more or less carinate, pleon segments 5 and 6 with subdorsal spinules. Head, rostrum short, lateral lobes short, obtuse, post-antennal corners acute or rectangular. Side-plates 1—-4 of moderate size, 4 much the largest, distinetly emarginate. Pleon segments 2 and 3, postero-lateral corners quadrate. Antenna 1 the longer, 34 joint not very short, accessory flagellum 2—6-jointed. Mouth-parts normal. Gnathopods 1 and 2 subequal. Peraeopod 4 the longest, its 24 joint moderately expanded, but much less than that of peraeopod 5. Uropod 3 rather short, outer ramus with small narrow 24 joint, inner ramus small, scale-like. Telson short, broad, eleft to the base. 5 species. Synopsis of species: Pleon segment 3, median dorsal carina rounded -—— 2. Pleon segment 3, median dorsal carina triangular — 3. 1 Fr RE DE re 1. A. cristata. : . . p.499 Median dorsal carina beginning on peraeon seg- RE SR a 2. A. pusilla . . . . p.500 Pleon segment 3, carina low . ........ 3. A. maximoviezi . p.500 Pleon segment 3, carina elevated — 4. 2 o Pleon segment 4 with small rounded dorsal ex- a a I ae a er 4. A.spinosa. . . . p.501 Pleon segment 4 with no dorsal expansion. . . 5. A.affinis . . . . p.501 | Median dorsal carina beginning on peraeon seg- : | . 1. A. cristata O. Sars 1894 A. c. (Amathillinella c. O. Grimm in MS.), G. ©. Sars in: Bull. Ac. St.-Petersb., ser.5 v.1 p.202 t.5; 1.6 £.1—8. Body stout, little compressed, carina low -on peraeon segment 1, gradually enereasing to broad triangular projections, important in size on peraeon segments 6 and 7 and pleon segments 1 and 2; the carina of pleon segment 3 evenly rounded. Pleon segments 4—6 each dorsally carrying a few simple hairs, segments 5 and 6 each with subdorsal spinules, 2 on each side. Head, rostrum blunt, lateral lobes broadly truncate, post-antennal corners acutely projecting. Eyes rather small, narrowly reniform, dark. Antenna 1, pedunele long, 1° joint not greatly longer than 24, nor 24 than 34, flagellum longer than peduncle, 20—25-jointed, accessory flagellum about 5-jointed. Antenna 2 much shorter, flagellum more than half as long as peduncle, 12-jointed. Gnathopods 1 and 2 in Q small, subequal, setose; 32* 500 Amathillina 6! joint in gnathopod 1 rather broader and more expanded distally than in gnathopod 2, where it has a rather narrow oblong oval form, palm in both somewhat oblique, defined by an obtuse angle carrying 2 short spines. Gnathopods 1 and 2 in © much stronger, nearly equal, 6" joint much longer and broader than 5%, somewhat expanded distally, especially in gnathopod 2, palm concave, defined by a nearly rectangular corner armed with 2. spines. Peraeopods 1—5 rather more elongated in S than in oO, with 24 joint of peraeopods 3—5 less expanded, especially in peraeopod 5; finger strong, ending in a sharp, eurved point. In peraeopods 3 and 4, 24 joint oval, distally narrowed, but in peraeopod 5 broadly expanded behind, hind margin serrate and ciliate, the broad distal lobe overlapping the 34 joint. Uropods 1 and 2 spinose, peduncle longer than the subequal rami, uropod 1 much the longer. Uropod 3 short, peduncle much longer than broad, 1° joint of outer ramus not much longer than peduncle, armed with 2 faseicles of spines on each side, 24 joint narrow, setiferous, '/;, as long as 1°, inner ramus very small. Telson broader than long, nearly semicircular, lobes not dehiscent, each with a spinule on outer margin, and a spinule and hairs at apex. L. © about 13, 9 nearly 15 mm. Caspian Sea. Depth 4-66 m. 2. A. pusilla O.Sars 1896 A.p., G. O.Sars in: Bull. Ace. St.-Pötersb., ser. 5 v.4 p.446 t.5 f. 15—25. } Body very short and stout, especially in ©. Peraeon segments 1—5 dorsally quite smooth; segments 6 and 7 and pleon segments L—3 carinate, each produced dorsally to a distinet laminar projection, the first 4 triangular, .the last rounded, gibbous. Pleon segments 4—6 with dorsal hairs. Head larger, side-plates 1—4 smaller than in the other species. Eyes oval reniform. Antenna 1 very slender and elongate, 1° joint nearly as long as 24 and 34 combined, flagellum twice as long as pedunele, about 16-jointed, accessory flagellum in O 2-, in J 3-jointed. Antenna 2 much theshorter. Gnathopod1inO, 6th joint rather broad, oval, palm oblique; gnathopod 2, 6% joint unusually narrow, oblong linear, palm very short, almost transverse. Gmathopods 1 and 2 in J powerful, nearly equal, 6 joint in both large and tumid. Peraeopod 5, 24 joint well expanded, hind margin serrate rather strongly, the distal lobe more produced in the © than in the JS, rather narrowly rounded. Uropod 3, pedunele thick, scarcely longer than broad, outer ramus little longer than peduncle, with terminal but no lateral spines, its 24 joint and the inner ramus very small. Telson broader than long, lobes not dehiscent, each with a minute spinule on the obtusely truncate apex. L. 4 mm. Caspian Sea. Sublitoral. 3. A. maximoviczi O. Sars 1896 A. m., A. maximovitschi, G.O. Sars in: Bull. Ac. St.-Pötersb., ser.5 &.4 p.444; t.5 f. 1—14. Body stout, peraeon not carinate, pleon segments 1—3 each with triangular dorsal crest, low in all, lowest in segment 3, segments 1—6 with dorsal hairs. Side-plates 1—4 rather small; pleon segments 2 and 3, postero-lateral corners minutely produced. Eyes of moderate size, oblong oval, not reniform. Antenna 1, 1° joint much thicker and a little longer than 24, 24 a little longer than 34, flagellum about twice as long as peduncle, 20-jointed, accessory flagellum 3-jointed. Antenna 2 in © scarcely half as long as antenna 1, in J rather longer than in 9. Gmnathopods 1 and 2 rather small in Q, much stronger in C', with 6! joint large, somewhat expanded distally, ee a ae 1 er ne Zee Amathillina, Carinogammarus 501 palm oblique, defined by an obtuse corner with several strong spines. Peraeopods 1—5 comparatively short and stout. Peraeopod 3, 24 joint oval, . narrowed distally. Peraeopod 4, 24 joint, especially in ©, unusually broad, rounded quadrangular. Peraeopod 5, 24 joint much expanded, the rounded Jower lobe descending below the 34 joint, a little in S, much in ©. Uropod 3, pedunele rather longer than broad, outer ramus nearly twice as long as peduncle, its 24 joint and the inner ramus small. Telson rather broader than long, the narrowly rounded apices rather divergent, each lobe with 2 spinules at apex and a hair on outer margin. . L. about 6 mm. Caspian Sea (bay of Karabugas).. 4. A. spinosa U. Sars 1896 A.s. (A. eristata var. spinata O. Grimm in MS.), G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.4 p. 442 t.4 f.7—16. Agreeing with A. cristata (p. 499) in gnathopods 1 and 2 and many other respects. Body moderately slender and compressed, peraeon segments 1—7 and pleon segments 1—3 each raised to a well defined dorsal back- ward pointing triangular expansion, successively larger, pleon segment 4 ending dorsally in a small but well defined rounded expansion, segments 5 and 6 having only a few dorsal hairs. Eyes reniform, obliquely placed, dark. Antenna 1, accessory flagellum in J 6-jointed. Peraeopods 3—5 differing from those of A. eristata in having the 24 joint comparatively narrower, and nearly alike in both sexes. Uropod 3 very short and thick, outer ramus scarcely longer than pedunele, only armed with 3 spinules and some setules, 24 joint very small, inner ramus scarcely longer than broad. Telson short, much broader than long, lobes rather divergent, each with a setule on outer margin and 2 hairs at rounded apex. L. © 25 mm. Caspian Sea (southern part). Depth 203 m. 5. A. affinis ©. Sars 1894 A.a., G.O.Sars in: Bull. Ac. St.-Petersb., ser. 5 v.1 p. 207 t.6 £.9--19. Near to A. cristata (p. 499). and still nearer to A. maximoviezi. Body short and stout, especially in O0, peraeon segments 1—4 or 1—5 quite smooth. peraeon segments 6 and 7, pleon segments 1—3 each with acutely projecting triangular dorsal carina, pleon segments 4—6 with no projection but fine hairs and small subdorsal spinules. Eyes distinetly reniform. Antenna 1, including 1° joint, slender, flagellum once and a half as long as peduncle, with 13 joints in O,to 30 ind, accessory flagellum 3-jointed. Gnathopod 1 in S, 6th joint rather tumid in the middle; otherwise the gnathopods 1 and 2 are nearly as in A. cristata. Peraeopods 1—5 and uropods 1—3 nearly as in A. maximoviezi. Telson rather longer than broad, lobes a little divergent, with no armature, except 3 fine hairs on each obtusely pointed apex. L. oO 6, 9 8 mm. Caspian Sea. Depth 4-6m. _ 50. Gen. Carinogammarus Stebb. 1862 Gammaracanthus (part.), Bate, Cat. Amphip. Brit. Mus., p.201 | 1899 Carino- gammarus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 429. Distinguished from Gammarus (p. 460) by having carinate segments; carina medio-dorsal only; relative proportions of peduneles of antennae 1 and 2, of gnathopods 1 and 2 and of inner and outer ramus of uropod 3 variable. 9 accepted and 2 doubtful species. ae EEE ey ner a ze 502 Carinogammarus Synopsis of accepted species: 1 Uropod 3, inner ramus not short — 2. Uropod 3, inner ramus short — 6. 0 Body carinate throughout -— 3. Body only partially carinate — 4. Antenna 1, accessory flagellum 3-jointed; gnatho- 3 pod 3,9 joint oblong: =. 2°... 1. ©. einnamomeus . p. 502 Antenna 1, accessory flagellum 12-jointed; gnatho- pod 2, 6th joint piriform. . » 2.2.2.2. 2.2. 2.0, weg 1, 2: p- 502 A Eyes halfmoon-shaped ©. 2 23, 22% 2328, 3.05 3. C. pulchellus . . p.503 Eyes oval — 5. 5 f Peraeopod 5, 2d joint widened distally. . . . - 4. C. seidlitzii . . . p.5083 \ Peraeopod 5, 2d joint narrowed distally . . . . 5. C.rhodophthalmus p. 504 Fleon segments 4 and 5 with erect spinose dorsal 6 KRnorle a ae 6. C. caspius . . . . p.504 Pleon segments 4 and 5 without erect dorsal tuberele — 7. f At least 2 of the peraeon segments carinate . . 7. C. atchensis . . «+ P.505 e \ At most 1 of the peraeon segments carinate — 8. Pleon segments 1—3, carina ti ped with spines. 8. C. subcarinatus . P- 505 pP P \ Pleon segments 1—3, carına acute, without spines 9. C. roeselii . . . - P- 506 g 1. C. einnamomeus (Dyb.) 1874 Gammarus c., B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p.114 t.7 £.3 | 1899 Carinogammarus c., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1898 Gammarus fluviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. Body laterally compressed, its upper surface rough, with delicate hairs in various parts; all segments dorsally provided with a distinet though weak median carina, occupying the whole length of the segments in peraeon segments 4—7 and pleon segments 1—3; hind margin of pleon segments 4—6 provided with 3 groups of tolerably strong spines, set on hump-like elevations. Head, front rounded, little prominent. Side-plates without setae on lower margin. Eyes rather large, prominent, reniform, black. Antenna 1, pedunele thicker and somewhat longer than that of antenna 2, or rarely shorter; with flagellum nearly '/, as long as body, and almost twice as long as antenna 2; flagellum 21—-28-jointed, accessory flagellum 3-jointed. Antenna 2, flagellum 9—12-jointed. Gmathopod 1, 6" joint piriform. Gnathopod 2, 6 joint oblong. Peraeopods 3—5, 24 joint heart-shaped, with very short setae wide apart on hind margin. Uropod 3 rather long, the outer 2-jointed ramus '/,—'/, longer than the inner, 24 joint more than /, as long as 1%, inner ramus longer than peduncle, both rami with plumose . setae on inner and simple on outer margin. Colour einnamon-brown. L. 18mm. Jake Baikal. Depth 50—100 m. 2. C. wagii (Dyb.) 1874 Gammarus w., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.121 t.1 f.4 | 1893 Ceradocus? w., A. Della Valle in: F. Fl. Neapel, v.20 p-931 | 1899 Carinogammarus w., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429. Median carina developed over the whole body, on the head appearing as an obscure rounded ridge-line, and gradually enereasing in height to pleon segment 3, from peraeon segment 5 running out into an acute, back- ward and upward directed angle; this carina occupies the whole dorsal length of each segment, is tolerably high, strongly compressed laterally, with convex 4 Ad ud u a a Da | Ad Carinogammarus 503 front and concave hind margin; on pleon segments 4—6 becoming hump- like and gradually weaker; marginal swellings are perceptible on the peraeon- segments and pleon segments 1—4, and on either side of the median carina in pleon segments 4—6 are strong humps, carrying 2 or 3 spinules each. Head, rostral point short. Side-plates L—4 rather deep, 5" not deep. Eyes slightly prominent, reniform, black. Antenna 1 about °/, as long as body, more than twice as long as antenna 2, peduncle longer than pedunele of antenna 2, and longer than the 70-jointed flagellum, accessory flagellum 11— 13-jointed, longer than the 12-jointed flagellum of antenna 2. Gnathopods 1 and 2, 6th joint rather large, piriform, finger long. Peraeopods 3—5, 24 joint heart- shaped, longitudinally carinate (in figure). Uropod 3 reaching back much beyond the others, the rami subequal, long, not foliaceous, both with numerous plumose setae and (in figure) with short stout spines, 24 joint of outer ramus rudimentary. Colour bright yellow, with delicate marking. L. 46 mm. Lake Baikal. Depth 70—150 m. 3. C. pulchellus (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.118 t.5 f.4 | 1899 Carinogammarus p., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1898 Gammarus flwviatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segment 7 and segments of pleon with a low es carina, which is obscurely developed on pleon segment 6; surface of body with delicate hairs on the hind part of the segments. Head with a small subacute rostrum. Side-plates 1—4 rather deep, with numerous setules on lower margin, 4!h broad, well emarginate behind; pleon segment 3, postero-lateral corners quadrate. Eyes rose-red, so placed on lateral lobes as to show partly in front between antennae 1 and 2, halfmoon-shaped, convex margin in front, bind margin irregular, cut into lobes. Antenna 1 about '/, as long as body, nearly twice as long as antenna 2, 1° joint thick, flagellum with 20—29 rather long joints, accessory flagellum with 3 or 4. Antenna 2, flagellum 6—9-jointed. Mandible, 39 joint of palp curved, much shorter than 24, Gnmathopods 1 and 2 small, slender, 5tk joint rather long, especially in gnathopod 2, 6t& joint oblong, with palm oblique in gnathopod 1, but transverse in gnathopod 2, the joint being also slightly widened at the palm, finger short. Peraeopod 3, 24 joint nearly circular. Peraeopods 4 and 5, 24 joint wide, with a distal narrowing, many spinules and setae on the expanded part. Uropod 1 is said to reach as far back as uropod 3, or in O somewhat farther. Uropod 3, inner ramus longer than 1% joint of outer, both beset with spines and plumose setae, 24 joint of outer about "/, as long as 1%. Telson with a few setules on the obtuse but narrow apices of the tapering lobes. Colour very delicately reddish white. L. reaching 23 mm. Lake Baikal. Depth 100—700 m. . 4. C. seidlitzii (Dyb.) 1874 Gammarus s., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.119 t.5 £.5 | 1899 Carinogammarus s., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.429 | 1893 Gammarus flwiatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segments 6 and 7 and pleon sogments 1—3 with a weak median carina forming a tuberele at about the middle of the segments; the spinules on the 5" and 6th pleon segments are extremely delicate; head, peraeon, and pleon segments 1—3 dorsally beset with delicate hairs, longest on hind margin of peraeon segments. Head narrow, rostrum subacute, not large. Side- plates 1—4 with long setae on lower margin. Eyes moderately large, not very 504 Carinogammarus prominent, oval, a little widened .below, red. Antenna 1 rather less than /, as long as body, twice as long as antenna 2, 1° joint stout, flagellum 27—34-jointed, accessory flagellum 4- or 5-jointed. Antenna 2, flagellum 9-jointed. Gnathopods 1 and 2 seemingly almost as in C. pulchellus (p. 503), but 6% joint of gnathopod 1 more piriform, and palm in ‚gnathopod 2 less completely transverse. Peraeopod 3, 24 joint carried in motion of the animal at an acute angle to the long axis of the body, the expansion ending in a lobe below. Peraeopod 5, 24 joint little longer than broad, its greatest breadth being at the distal end. Uropods 1 and 2 not long, reaching nearly to end of uropod 3. Uropod 3, inner ramus longer than 1° joint of outer. The deeply eleft telson is ; deseribed as long. Colour en L. reaching about 17 mm. Lake Baikal. Depth 50—100 m. 5. C. rhodophthalmus (Dyb.) 1874 Gammarusr. + @.r. var. mierophthalmus, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.116, 117 t.14 £.10 | 1899 Carino- gammarus r., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.429 | 1898 Gammarus flwiatilis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 930. Peraeon segments 6 and 7 and pleon segments I—4 or 1—5 with a weakly indicated median tubercular carina, pleon segment 6 with 2 groups of delicate spinules; (in var. microphthalmus carina extending to pleon segment 5, or only to 3; pleon segment 6 with a pair of setae). Head, front shortly produced, obtusely triangular. Side-plates 1—4 setose on lower margin, 4th hroad, well emarginate; pleon segment 3, postero-lateral corners quadrate. Eyes very large, prominent, broadly oval, oecupying nearly half the lateral surface of head, the front part turned forward and inward, ruby-red, (in the variety much smaller, but still tolerably large, black or reddish black). Antenna 1 half (in. the variety more than half) as long as body, twice as long as antenna 2, 1° joint stout, flagellum 37—44- (in the variety 8—34-) jointed, accessory flagellum 3—5-jointed. Antenna 2, flagellum 7—-11-jointed. Gnathopods 1 and 2 small, subequal, 5!" joint not elongate, 6! piriform in gnathopod 1 (in figure oblong, with oblique palm; in the variety described as oval); 6! joint in gnathopod 2 oblong, narrower than in gnathopod 1. palm much less oblique. Peraeopods 3—5, 24 joint with the expansion abruptly narrowing below, though less so in peraeopod 5 than in 3 and 4; in all the hind margin armed with loıig setae. Uropod 3, inner ramus about as long as 1° joint of outer (in variety the rami subequal). Colour white or bright yellow. L. 14—20 mm. Lake Baikal, Depth 8—100 m. 6. C. easpius (Pall.) 1771 Oniscus e., Pallas, Reise Ruß., «.l p.477 ! 1841 Gammarus c., Eichwald in: N. M&m. Soc. Moscou, ®%.7 p.230 | 1894 @.ce., G. O. Sars in: Bull. Ae. St.-Pötersb., ser.5 v.1 p.210 t.7 | 1899 Carinogammarus c., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v. 7 p. 430 | 1862 Gammarus semicarinatus, Bate, Cat. Amphip. Brit. Mus., p. 204 t.86 f.3 | 1893 @. fluviatilis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 763. Peraeon segment 7 sometimes slightly carinate and produced to a small tooth; pleon segments 1—3 strongly carinate, each produced into a large acute backward pointing tooth; segments 4 and 5 each with an elevated flat-topped dorsal tuberele, capped by 2 pairs of spines, segment 6 with 1 pair of subdorsal spinules.. Head, rostrum almost obsolete, lateral lobes broad, obtusely truneate. Side-plate 4 much the largest. Pleon segments 2 and 3, postero-lateral corners acute. Eyes oblong reniform, sometimes dark. Antenna 1 ed 73 Carinogammarus 505 slender, nearly half as long as body, 1% joint subequal to 24 and 34 combined, flagellum longer than pedunele, accessory flagellum 5-jointed. Antenna 2 much shorter, ultimate joint of peduncle shorter than penultimate, flagellum about 10-jointed.. Gnathopods 1 and 2, 5th joint short, cup-shaped, 6t" oblong oval, palm somewhat oblique, shorter than hind margin, defined by obtuse angle with strong spine; gnathopods stronger in JS than in Q, and gnathopod 2 considerably larger than gnathopod 1. Praeopod 1 longer than peraeopod 2. Peraeopod 3 shorter than 4 and 5, 24 joint little longer than broad, slightly narrowed distally. Peraeopod 4, 24 joint longer, distally more narrowed. Peraeopod 5, 24 joint longer, oblong quadrangular, hind margin as in peraeopods. 3 and 4 serrate. Uropods 1 and 2, rami subequal, with lateral and apical spines. Uropod 3 reaching much beyond the others, short peduncle with 4 spines on apical margin, outer ramus nearly thrice as long as peduncle, fringed round with long plumose setae, 24 joint minute; inner ramus_ scale-like, !/, as long as peduncle, with 1 spinule on inner margin and 1 on apex. Telson scarcely so long as broad, each subeonical lobe with 2 spinules and some hairs on the obliquely truncate apex. L. © 13, J 16 mm. Caspian Sea. Depth 1—37 m. 7. C. atehensis (F. Brandt) 1851 Gammarus a., F. Brandt in: Middendorff, Reise Sibirien, ©.21ı p.138 t.6 f.29 | 1862 @. a., Bate, Cat. Amphip. Brit. Mus., p. 217 t.88 f.7 | 1899 Carinogammarus a.. T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 430 | 1893 Melita palmata (part.)?, A. Della Valle in: F. Fi. Neapel, v.20 p. 765. Peraeon segments 1—3 dorsally rounded, segments 4 and 5 obscurely, 6 and 7 feebly carinate; pleon segments 1—3 pretty strongly carinate, segment 4 slightly carinate in front, behind, like segments 5 and 6, rounded; segments 1—3 with rows of spinules on hind margin, and between these and the carina-tooth a low eminence also beset with rows of spinules; segment 4 with 2 curved eminences on each side, pectinate with 4— 7 spinules; segment 5 with 1 or 2 or even 3 such eminences, earrying 6 or 7 or fewer spinules, segment 6 with a front inner very small pair of eminences, and a more spiny outer larger pair behind. Head, rostrum very short. Eyes long elliptie or somewhat reniform. Antenna 1 scarcely half as long as body, flagellum longer than peduncle, 33-jointed, accessory flagellum 7-jointed, about '/, as long as primary. Antenna 2 shorter, flagellum 19-jointed. Gnathopods 1 and 2 subequal, or gnathopod 1 rather the larger, 5!" joint short, cup-shaped, 6!" rhomboidal, little longer than broad, a little widened to the palm, which is furnished with little teeth or spines and obliquely truncate in gnathopod 1, but almost transverse in gnathopod 2. Peraeopods 1—5 stoutly built, rather short, with faseicles of spines but few setae. Uropods 1 and 2, rami short, broad, strong and spinose. Uropod 3 as long as the preceding or longer, rami spinose, lanceolate, inner not half as long as outer, scale- like (in figure). Telson cleft to the base, as long: as short pedunele of uropod 3, each subeonical lobe with 3 spinules at apex. L. 25 mm. (According to Brandt; Bate differs in many respects.) \ Behring Sea (Isles of Atcha and Unalaschka). 8. C. subearinatus (Bate) 1862 Gammarus s. (Stimpson in MS.), Bate, Cat. Amphip. Brit. Mus., p.205 t.36 £.5 | 1899 Carinogammarus s., T. Stebbing in: Tr. Linn. Soe, London, ser.2 v.7 p.430 | 1893 Gammarus marinus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 76». Pleon segments 1—3 having the dorsal median line slightly elevated into a carina, with a faseiele of short spines on the blunt apex of the carina (figure), a fascicle of spines on either side, encreasing in importance on successive 506 Carinogammarus segments to end of pleon, segments 4—6 with no median carina. Eyes oval- Antennae 1 and 2 subequal, '/, as long as body. Gnathopod 1 the larger, 5th joint short, eup-shaped, 6% broadly oblong oval, palm slightly concave, slightly oblique, set with several short spine-teeth, finger with an obtuse projection near middle of inner margin. Gnathopod 2, 6! joint narrowly oblong, hind margin serrate and setose, palm transverse, sinuous, armed as in gnathopod 1; finger as in gmathopod 1. Peraeopods 1—5 subequal, spinose. Peraeopods 3—5, 24 joint seemingly piriform. Uropod 3, outer ramus thrice as long as inner. Telson not spinose. L. 25 mm. Behring Strait. 9. C. roeselii (Gerv.) 1755 „Squilla (Astacus) fluviatilis“, Rösel, Insecten- Belustig., v.3 p.351 t.62 f.1--7 | 1835 Gammarus roeselü, P. Gervais in: Ann. Sei. nat., ser.2 v.4 p.128 | 1850 G. flwiatilis (non H. Milne Edwards 1830!), @. röselii, Hosius in: Arch. Naturg., v.161 p.234 t.3,4 | 1899 Carinogammarus f., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.430 | 1841 Gammarus pulex (err., non J.C. Fabrieius 1775!), ©. L. Koch, ©. M. A., v.36 nr. 21. Peraeon segment 7 produced to a small tooth; pleon segments 1—3 each rounded in front. behind produced to an acute, carinate tooth, devoid of spines, segments 4 and 5 with slight median elevation, carrying apical spines, and a raised group of spines on either side, slightly to the rear of the middle one, segment 6 with a pair of slight subdorsal elevations carrying spines. Head, rostrum obsolete, lateral lobes obtuse, post-antennal corners produced acutely forward. Side-plates 1—4 rather deep, 4 the largest. Pleon segment 3, postero-lateral corners acute. Eyesreniform, black. Antennal, flagellum 34-jointed, accessory flagellum with 4 joints, of which 1° und 4th are very short. Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum 15-jointed. Gnathopods 1 and 2 subequal, 5t% joint short, 6% piriform in gnathopod 1, oblong in gnathopod 2. Uropods 1 and 2, outer ramus rather shorter than .inner. Uropod 3 probably as in C. caspius (p. 504). Telson completely cleft, lobes divergent, tipped with spines. Colour greyish brown with red spots, conspieuous on tips of dorsal teeth. L. 14 mm. Europe. Rivers and ponds. C. macrophthalmus (Stimps.) 1853 Gammarus m.. Stimpson in: Smithson. Contr., v.6 nr.5 p.55 | 1862 Gammaracanthus m., Bate, Cat. Amphip. Brit. Mus., p.203 | 1893 Ceradocus? m., A. Della Valle in: F. Fl. Neapel, v.20 p.929 | 1894 Amathilla? m., G. O. Sars, Crust. Norway, v.1 p.494 | 1899 Carinogammarus? m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 480. Carinate only at the pleon. Side-plates small. Eyes large, subreniform, approxi- mate. Antenna 1, accessory flagellum scarcely perceptible. Uropods 1 and 2, outer ramus the shorter. Uropod 3, rami broad lanceolate, shorter than in Gammarellus homari (p. 387). Colour bright erimson, or red and white mottled. L. 12 mm. Fundy Bay (Grand Manan). Low-water mark, and Laminarian zone. C. mucronatus (Say) 1818 Gammarus m., Say in: J. Ac. Philad., v. Im p.376 | 1873 G. m., (S. I. Smith in:) A. E. Verrill in: Rep. U.S. Fish Comm., v.1 p.559 | 1862 Gammaracanthus m., Bate, Cat. Amphip. Brit. Mus., p. 203 | 1894 Amathilla? m.. G. O. Sars, Crust. Norway, v.1 p.494 | 1899 Carinogammarus? m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 430 | 1893 Gammarus er ree (part.)?, A. Della Valle in: F. Fl: Neapel, v.20 p. 729. Pleon segments 1—3 mucronate above, but (Smith) not distinetly carinate, seg- ments 3—5 carrying faseicles of spines. Eyes blackish, irregularly reniform, truncate above. Antennae 1 and 2 subequal. Antenna 1, flagellum 20-jointed, accessory flagellum reaching end of 4th joint of primary. L. less than 12-5 mm. North-Atlantie (North Carolina, Cape Cod, usually in brackish water; Florida). Gammaracanthus 507 51. Gen. Gammaracanthus Bate De 1862 Gammaracanthus (part.), Bate, Cat. Amphip. Brit, Mus., p.201 | 1871 @., A. Boeck in: Forh. Selsk. Christian., 1870 p. 214 | 1894 @., G. O. Sars, Crust. Norway, ©.1 p.493 | 1894 @., T. Stebbing in: Bijdr. Dierk., v.17 p.41. Body carinate throughout, carina in many segments produced into a tooth, lower margin of peraeon segments carinate, this carina continued along middle of pleon segments I—3 or 1—4. Head, rostrum long, acute, lateral corners small, rounded, with prominent process below. Side-plates 1—4 ridged from above downward, parallel-sided, 5t" nearly as deep as 4th, its front lobe the deeper. Eyes rather prominent, not very large. Antenna 1 with accessory flagellum. Antenna 2 much shorter, siender. Upper lip rounded. Lower lip, inner lobes incompletely separated from outer. Mandible normal, 34 joint of palp as long as 24. Maxilla 1, several (6) setae on inner plate, 11 spines on outer. Maxilla 2, inner margin fringed. Maxillipeds, palp elongate. Gnathopods 1 and 2, 5!" joint short, cup-shaped, 6!" powerful, finger long. Peraeopods 3 and 4 much longer than 1°, 24 or 5th, Peraeopods 3—5, 24 joint little expanded. Uropod 1, rami shorter than peduncle, equal. R Uropod 3, rami longer than peduncle, sctose, laminar, ending obtusely. Telson F very small, bilobed. E 3 species. in na BAR a ” Synopsis of species: Pleon segments 2 and 3, postero-lateral corners acutely Pleon segments2 and, postero-lateral cornersquadrate 1. G. lacustris. . p.507 i | produced — 2. Rostrum eurved, produced beyond 1st jointof antenna 1 2. G. loricatus. . p. 508 2 Rostrum almost straight, not produced beyond 18st joint DER en TER EIE Hana 3. G. caspius . . p.508 1. G. lacustris O. Sars 1861 Gammarus loricatus (err., non Sabine 1821'), S. Loven in: Öfrv. Ak. Förh., 0.18 p.287 | 1867 Gammaracanthus 1. var. lacustris, G. O. Sars, Crust. d’Eau douce Norvöge, p.73 t.7 f.1--8 | 1888 @. lacustris, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1699 | 1894 @. relietus, G. O. Sars, Crust. Norway, v.1 p.494 t. 174 | 1896 @. r., G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.4 p.439. Body slender and compressed, dorsal carina rather low in front, projeetions scarcely beginning till peraeon segment 5, those following to pleon segment 5 very acute. Head, rostrum very slightly curved, not reaching end of 1° joint of antenna 1, lateral corners very small, projection below tubereuliform. Pleon segment 3, postero-lateral corners quadrate. Eyes rather small, rounded, dark. Antenna 1 nearly !/, as long as body, 34 joint not very. short, flagellum rather longer than peduncle, about 22-jointed, accessory flagellum 4-jointed. Antenna 2 little more than '/, as long as antenna 1, basal joint tumid, ultimate joint of peduncle shorter than penultimate, flagellum 7-jointed. Gmnathopod 1 fully as large as gnathopod 2, 5!" joint produced to a small narrow setiferous lobe, 6" expanding to beginning of palm, which is convex, scarcely longer than hind margin, defined by an obtuse angle and several spines, one rather long. Gnathopod 2, 6" joint oblong oval, broadest near the base, tapering distally, palm very oblique, much longer than hind margin. Peraeopods 1 and 2 little longer than gnathopods 1 and 2. Peraeopods 3 and 4 extremely slender and elongate, 5t" joint much longer than 4%, Peraeopod 5, 24 joint a little more expanded proximally than in other peraeopods. 508 Gammaracanthus, Acanthogammarus Uropod 3, rami fringed with plumose setae. Telson nearly twice as broad as long, cleft wide, angular, more than half the length. L. Q 35 mm. Sweden, Norway, Russia. Lakes. . 2. G. lorieatus (Sab.) 1821 & 24 Gammarus I., E. Sabine in: W. E. Parıy, J. Voy., Suppl. p.53 t.1 £.7; p.281 t.1 f.7 | 1838 @.1., Kröyer in: Danske Selsk. Afh., v.7 p.250 t.1£.4 | 1866 @.1., Goesin: Ofv. Ak. Förh., v.22 p.531 | 1862 Gammaracanthus!., Bate, Cat. Amphip. Brit. Mus., p.202 t.36 f.2 | 1876 @. L, A. Boeck, Skand. Arkt. Amphip., v.2 p.400 | 1894 @.1., T. Stebbing in: Bijdr. Dierk., 0.17 p.40 | 1893 Ceradocus 1., A. Della Valle in: F. Fl. Neapel, v.20 p.719. Near to G. lacustris (p. 507). Body rather stouter. Dorsal carina well deve- loped from rostrum to pleon segment 5 inclusive, variably shaped on the anterior peraeon segments. Head, rostrum curved, projecting beyond 1°t joint of antennal, lateral corners rounded, not very large, projection below boldly prominent. Pleon segments 2 and 3, lateral corners acutely produced. Eyes rather small, oval reniform, dark., Antenna 1, flagellum 30-jointed, accessory flagellum 4-jointed. Antenna 2, flagellum 12—16-jointed. Gmathopods 1 and 2 similar to those of G. Jacustris, but more robust and gnathopod 2 decidediy larger than gnathopod 1. Peraeopods 3—5 a little stronger than in G. laecustris. Colour yellowish white. L. reaching 43—58 mm. Arctic Ocean (Greenland, Spitzbergen, Nova Zembla, Siberia). Depth 79 m. 3. G. caspius O. Sars 1880 G.c. (nom. nud.), OÖ. Grimm in: Arch. Naturg., v.461 p.119 | 1896 @. c., G. O. Sars in: Bull. Ac. St.-Petersb., ser.5 v.4 p.439 t.4 f.1—6. Very like G. lorieatus, but rostrum nearly straight, only reaching apex of 1° joint of antenna 1, projections below lateral eorners of head less prominent; pleon segments 2% and 3, postero-lateral corners less produced. Antenna 2, flagellum shorter than ultimate joint of pedunele, 8-jointed. L. 36 mm. Caspian Sea. Depth 203 m. 52. Gen. Acanthogammarus Stebb. 1899 Acanthogammarus, T. Stebbing in: Tr. Linn. Soc. London, ser. 2°v.7 p. 430. Body with median more or less dentate carina, and also lateral or marginal carinae more or less developed. Head, rostrum very short. Side- plate 5 much shallower than 4". Antenna 1 the longer, accessory flagellum usually much developed, always with more than 1 joint. Mouth-parts normal. Peraeopods 3 and 4, 24 joint narrowed below. Uropod 3, rami subequal,- not foliaceous. Telson deeply cleft. 6 species. Synopsis of species: N Uropod 3, outer ramus shorter than inner — 2. Uropod3, outer ramus not shorter than inner — 3. j Peraeopod 5 shorter than the body... . . 1. A. cabanisii : . . . p.509 \ Peraeopod 5 longer than the body... . . 2. A. zienkowiczii . . . p.509 3 | Side-plates 1—4 with lower margin concave . 3. A.godlewskii. . . . p.510 Side-plates 1—4 withlower margin not concave — 4. 4 j Side-plate 4 with outward projeeting process 4. A. radoszkowskii.. . p.510 \ Side-plate4 withoutoutward projeeting process — 5. j 5 | Median carina without dentices ...... 5. A.armatus..... p.511 Median carina with dentieles. .. ..... 6. A. parasiticus . . . p.5ll I. 0 NE RN RM, ” Ba Hu iin fu auce a NEE TE SER Acanthogammarus 509 1. A. cabanisii (Dyb.) 1874 Gammarus ce, B. Dybowsky in: Horae Soe. ent. Ross., v. 10 suppl. p. 122 t. 13 f.5 | 1899 Acanthogammarus e., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.430 | 1893 Pallasea cancellus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 928. = Median carina on all segments, on peraeon segments 1—5 in the form of low, narrow, tooth-like processes, looking in side-view like little triangles, on peraeon segments 6 and 7 and pleon segments 1—3 in form of acute, backward direeted divided spines or of narrow, tolerably acute, and high 2-jointed teeth; all segments have also a flat, distinet marginal swelling, and the pleon segments also on the hind margin a hump, carrying 1 or 2 spines. Head smooth above, not inflated in the ocular region, rostrum acute, slightly directed upward, separated by a deep cavity from the lateral lobes. Side-plates 1—4 distally acute, the 1° almost spine-like, greatly advanced forward over the cheeks. Eyes small, point-like, white. Antenna 1 longer than the body, 4—6 times as long as antenna 2, 1° joint prismatic, tapering, much longer than 2% and 3% combined, twice as long as ultimate joint of pedunele in antenna 2, flagellum very long, 84—108-jointed, accessory flagellum 8-jointed. Antenna 2, ultimate joint of peduncle serrato-dentate on inner margin, flagellum tapering, with 17 joints set obliquely, of serrate appearance and furnished (?) with ealceoli. Gmathopods 1 and 2, 6 joint is described as piriform, with broad base (in figure rather oblong oval, with no palm distinguishable). Peraeopods 3—5, 24 joint nearly thrice as long as broad, almost linear, with the wing slightly developed above. Peraeopods 4 and 5 shorter than the body. Uropod 1 reaching much beyond uropod 3. Uropod 3, outer ramus about '/, shorter than the inner, both having numerous plumose setae. Telson cleft to the middle, apices acute (in figure blunt). Colour white. L. 55 mm. Lake Baikal. Depth 200—700 m. 2. A. zienkowiezii (Dyb.) 1874 Gammarus z., B. Dybowsky in: Horae Soe. ent. Ross., ©. 10 Suppl. p.124 t.3 £.5 | 1899 Acanthogammarus z., T. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.430 | 1893 Ceradocus? zienkoviezii, A. Della Valle in: F. Fi. Neapel, v.20 p. 931. Median carina more or less strongly developed throughout peraeon and pleon, on peraeon segment 1 asa hump with 3 teeth, 2 side by side bending forward in front, a 34 behind bending back; on peraeon segments 2—6 commonly as a ridge with blunt hump in front and acute, forward bent tooth behind; on pleon segments 1—3 the carina is higher, and has a 34, acute, straight tooth; on segment 4 there is a hump and a straight tooth, on segments 5 and 6 usually no tooth; on peraeon segments 1—5 the margins are swollen; on all ‘the others, on the hind margin over the marginal swellings, there is a hump which runs out into an acute, outward and backward directed tooth. Head smooth, rostrum short, acute. Side-plates 1—4 shallow, 1° — 34 distally narrowed (not in figure) and rounded; 4 broad, the hind emargination (in figure) extending the whole depth of the plate. Eyes small, point-like, violet. Antenna 1 nearly twice as long as body and seven times as long as antenna 2, 1° joint as in A. cabanisii, flagellum of great length, 108—119-jointed, accessory flagellum 5-jointed. Antenna 2, ultimate joint of peduncle thickened, projecting over base of flagellum and armed with long stout plumose setae, flagellum 7-jointed. Gnathopod 1, 6tk joint piriform. Gnathopod 2 somewhat larger, 6! joint oblong, hind margin and palm convex. - Peraeopods 3—5 very long and fragile, 24 joint almost linear. Peraeopods 4 and 5 longer than the body. Uropod 3, outer ramus about */,, shorter 510 Acanthogammarus than inner, both with numerous plumose setae. Telson divided. Colour rose-red or violet, with yellowish shimmer above. L. 32 mm. Lake Baikal. Depth 300-700 m. 3. A. godlewskii (Dyb.) 1874 Gammarus g. + @.g. var. vietorii, B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p. 143, 144 t.1 f.6 | 1895 Ceradocus? g., A. Della Valle in: F. Fl. Neapel, v.20 p. 928 | 1899 Acanthogammarus g.. T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.430. Median carina usually on peraeon segments 1—4 forming short, blunt teeth, on peraeon segments 5—7 and pleon segments 1—3 long, acute teeth, those on peraeon segment 7 and pleon segment 1 the longest, on pleon segment 4 a short, blunt tooth; on pleon segments 5 and 6 the carina is weak, not dentate; the coalesced marginal and lateral carinae on peraeon segments 1—3 represented by short teeth standing out horizontally from the body and directed somewhat backward; on segment 4 the tooth is of unique size, (especially in var, vietorü); on segments 5—7 the teeth are short; on pleon segments 1—4 giving place to flat swellings, and on segments 5 and 6 unrepresented. Head rough above, with a depression at the front, rostrum short, acute. Side-plates 1—4 with concave lower margin, 1° produced acutely forward, 24 and 34 rather narrowed distally; 4" pentagonal, much deeper than 5th, with lateral projecting spine-like tooth near lower margin. Eyes prominent, reniform, black. Antenna 1 longer than half the body, more than twice as long as antenna 2, peduncle thicker and longer than that of antenna 2, or in variety more slender and shorter, 39 joint in J as long as 1°, or rather longer, flagellum 50—60-jointed, accessory flagellum 10-jointed. Antenna 2, ante- penultimate joint of peduncle in J eylindrie, in Q flattened and about 5 times as long as broad, flagellum 11-jointed. Gnathopods 1 and 2, 6t& joint piriform, in gnathopod 2 hind margin more convex than in gnathopod 1. Peraeopods 3—5, 24 joint narrow, longitudinally carinate; in peraeopods 3 and 4 the hind margin slightly sinuous, in 5tk slightly convex, in all fringed with short, simple setae. Uropod 1 reaching beyond uropod 3. Uropod 3, inner ramus little shorter than outer, both with numerous plumose setae. Telson divided to the centre, or ‘(in the variety) more deeply. Colour reddish or brownish yellow. L. reaching 76 mm. Lake Baikal. Depth 10—150 m. 4. A. radoszkowskii (Dyb.) 1874 Gammarus r., B. Dybowsky in: Horae Soc. ent. Ross., v.10 suppl. p.149 t.13 f.3 | 18938 Ceradocus? r., A. Della Valle in: F. Fl. Neapel, v.20 p. 930 | 1899 Acanthogammarus r., T. Stebbing i in: Tr. Linn. Soe. London, ser.2 v.7 p.430. Median carina on peraeon segments 1—7 and pleon Free 1—3 tubereular, on pleon segments 4 and 5 forming a strong, broad tooth, with humps on'the front surface, on pleon segment 6 reduced to a feeble elevation; lateral carinae on peraeon segments 1—7 and pleon segments 1—3 consisting of little humps, successively smaller; marginal carinae represented by feeble swellings, those on pleon segments 4 and 5 each carrying 2 or 3 spine-points. Head, upper surface level, rostrum very short, much less advanced than the sub- quadrate lateral lobes. Side-plate 1 slightly "expanded below and direeted forward, 4 hroad, convex in front and below, behind produced outward into a large semicylindrical blunt tooth. Pleon segments 2 and 3 (in figure), postero-lateral corners quadrate. Eyes small, often point-like, irregular in shape, white. Antenna 1 scarcely ’/, as long as body, about twice as long as antenna 2, pedunele not thicker but shorter than peduncle of antenna 2, flagellum u > AN 2: T. 5 DEE a 5 0 15 En Pen Se Fa N nn le a ha rt Ber Acanthogammarus 511 34-jointed, accessory flagellum 4-jointed. Antenna 2, flagellum 10-jointed. Gnathopods 1 and 2, 5th joint short, 6" tending to oblong, but widening somewhat to the palm, especially in gnathopod 1, which has the palm more oblique than that of gnathopod 2. Peraeopods 3 and 4, 24 joint heart-shaped, with long setae on hind margin. Peraeopod 5, 24 joint well expanded, oblong, but with the wing not quite reaching the top of the 39 joint. Uropod 1 not reaching beyond uropod 3. Uropod 3, inner ramus very little shorter than outer, both with plumose setae on inner, and simple setae on outer margin. Telson divided. Colour brownish. L. 45 mm. Lake Baikal. Depth 100—200 m. 5. A. armatus (Dyb.) 1874 Gammarus a., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.146 t.12 f.1 | 1893 Ceradocus? a., A. Della Valle in: F. Fl. Neapel, v.20 p. 927 | 1899 Acanthogammarus a., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.430. ; Median carina on peraeon segments 1—7 composed of lateral compressed humps, successively larger, on pleon segments I—3 represented by 2 groups of spines, arranged in sets of 3—5 on low elevations, on pleon segments 4—6 represented only by 4 spines on the hind margin of each segment; lateral carinae of peraeon, placed high up on the back, composed of strong ridge or tooth-like prominences, strongly compressed from before backward, directed obliquely to the long axis of the animal and bent backward, the upper rounded margin beset with 2—7 spines. Head smooth, rostrum short. Side-plates carry only 2 short, spine-like setae. Pleon segment 3, postero- lateral corners rounded. Eyes rather large, oval reniform, slightly prominent, black. Antenna 1 about ”/, as long as body, 4—5 times as long as antenna 2, with peduncle stouter and twice as long, 1° joint little longer than either 24 or 34, which are subequal, flagellum 30—47-jointed, accessory flagellum 3—5-jointed. Antenna 2, flagellum 5—8-jointed. Gnathopod 1, 6%% joint piriform. Gnathopod 2, 6% joint oblong. Peraeopods 3—5, 24 joint heart-shaped, lower hind corner quadrate. Uropod 1 not reaching beyond uropod 3. Uropod 3, outer ramus !/—!/, longer than inner, both with plumose setae on inner margin. Telson divided, the division (in figure) reaching to the base, the lobes conical, not so long as peduncle of uropod 3. Colour bright horn-brown with darker marbling and a lighter band across peraeon. L. reaching over 24 mm. Lake Baikal. Depth 10m. 6. A. parasiticus (Dyb.) 1874 Gammarus p., B. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.147 t.3 £.3 | 1893 Ceradocus? p., A. Della Valle in: F. Fl. Neapel, v.20 p. 929 | 1899 Acanthogammarus p., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.430. Median carina on peraeon segments 1—7 forming tooth-like elevations, on pleon segments 1—3 keel-like, all beset with a tolerably constant number of spines; the divided tooth of peraeon segment 1 with 3 pairs of spines, segment 2 with 4 or 5, segment 3 with 4—6, the rest with 2 or 3; pleon segments 1—3 each with 2 spines at the base and several others; pleon segments 4—6 without spines; marginal carinae immediately over the side-plates, on peraeon segments 1—7 tooth-like elevations, each with 3—5 spines, on pleon segments 1—3 represented by very weakly developed tubereular humps, each with 1 spine Head with short rostrum, and 16—18 denticles distributed over the upper surface and sides. Side-plates 1—4 with only isolated short setae. Eyes roundish, very prominent, black. Ben > RT 512 Acanthogammarus, Gammaridarum species incertae sedis ‚Antenna 1 as long as body, almost thrice as long as antenna 2, with pedunele stouter and almost twice as long, flagellum 27-jointed, accessory flagellum 2-jointed. Antenna 2, flagellum 8-jointed. Gnathopod 1, 6 joint piriform. Gnathopod 2, 6 joint oblong, widened towards the palm. Peraeopods 3—5, 24 joint not widely expanded, hind margin acute-angled at top, then convex, concave and spinose below, outer surface longitudinally carinate, the carina in peraeopods 3 and 4 armed with 2 or 3 spines and produced below. Uropod 3, outer ramus scarcely longer than the inner, with plumose setae only on inner margin, the inner ramus having them on both margins. Telson divided. Colour greenish to yellowish, with golden yellow tips to carinae and teeth. L. 12 mm. Lake Baikal. On or near Spongia baicalensis. Gammari nominatim, reapse incertae sedis. Gammarus caudisetus Viv. 1805 @.c., Viviani, Phosphor. Maris, p.7 t.1 £.3,4 | 1888 @. c., ?.Hyperia medusarum, T. Stebbing in: Rep. Voy. Challenger, v.29 p- 76, 78 | 1893 @.? c., A. Della Valle in: F. Fl. Neapel, ©. 20 p.766 | 1872 Hyperia c., A. Boeck, Skand. Arkt. Amphip., v.1 p.39. Genoa harbour. G. chilensis Nie. 1849 @. c., H. Nicolet in: Gay, Hist. Chile, v.3 p. 239, . Body smooth, without spines or tubereles. Eyes round, very small. Antenna 1 very slender, much longer than antenna 2, 1st joint stout, eylindric. Antenna 2 con- siderably stouter, pedunele very long, hirsute, flagellum short. Gnathopods 1 and 2 subequal, 6th joint little dilated, suboval. Peraeopods 4 and 5 very long, spinulose. L. 8 mm. Sea of Chili. G. cireinnatus Viv. 1805 @. ce., Viviani, Phosphor. Maris, p.9 t.2 f. 9, 10 | 1888 @. c., Amphithoe? c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.76, 78 | 1893 Elas- mopus? c., A. Della Valle in: F. Fl. Neapel, v.20 p. 766. Body subeylindrieal. Pleon segments 1—3, postero-lateral corners angular. “Antenna 1 short, much longer than antenna 2, 2d joint in figure much shorter than 1st, Limbs all slender. Uropod 3 slightly suggestive of Ampithoe (p. 631). Colour yellowish to faint reddish. Genoa harbour. G. crassimanus Viv. 1805 @. c., Viviani, Ehosphor. Maris, p.10 t.2 f.7,8 | 1872 @.?c., A. Boeck, Skand. Arkt. Amphip., v.1 p.39 | 1888 @. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.77 |1893 @.c., A. Della Valle in: F. FI. Neapel, v.20 p. 726 | 1862 Moera truncatipes (part.)?, Bate, ‚Cat. Amphip. Brit. Mus., p. 189. Antenna 1, 2d joint longer and thinner than 1st. Antenna 2 only half as long. Eyes rather broad, black. Front feet with granular chela. Genoa harbour. G. dubius Johnst. 1827 @.d., G. Johnston in: Zool. J., v.3 p.178 | 1888 @.d., T. Stebbing in: Rep. Voy. Challenger, v.29 p.131 | 1893 @. d., Amphithoe (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 766. Eyes roundish, black. Antennae 1 and 2 slender, nearly equal, about half as long as body. Antenna 1, 1st joint longer than 2d. Gnathopods 1 and 2 like those of Ampithoe rubricata (p. 639), but rather smaller, 6th joint oblong, not much dilated. Anterior legs short, hinder long. Uropods 1—3 long. Telson divided. L. 4—6 mm. North-Sea (Berwick). Rock pools among Confervae. e Gammaridarum species incertae sedis 518 G. flabellifer Stimps. 1855 @.f., Stimpson in: P. Ace. Philad., v.7 p.382 | 1862 @.f., Bate, Cat. Amphip. Brit. Mus., p. 222 | 1893 @. locusta (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 766. Slender, smooth posteriorly. Eyes small, round, black. Antenna 1 half as long as body, flagellum 20-jointed, accessory flagellum 5-jointed. Gnathopods 1 and 2, 6th joint oblong elliptie, with a fusiform area below surrounded by short setae. Uropod 3, ' rami long, lamelliform, elliptical, equal, spreading like a fan. L. 12 mm. North-Paeifie (Loo Choo Islands). G. fontinalis A. Costa 1883 @.f., A. Costa in: Atti Ace. Napoli, ser.2 v.1 nr.2 p.82, 106 | 1884 @. f., A. Costa in: Bull. Soe. ent. Ital., v.15 p. 340 | 1893 @. f., A. Della Valle in: F. Fl. Neapel, v.20 p. 766. Very near to Carinogammarus roeselii (p.506); differs by want of the dorsal spines of the pleon segments 4—6, these only on the posterior margin presenting a few backward directed apinnlen, Sardinia. In a spring. G. minus Say 1818 @. m., Say in: J. Ac. Philad., v. in p.375 | 1840 @. fasciatus (part.)?, @. minimus (laps.), H. Milne Edwards, Hist. nat. Crust., v.3 p. 46. United States of America. In brooks under stones. G. peloponnesius Guer. 1832 & 35 @.p., @. peloponnesiacus, Guerin(-Möne- ville) in: Exp. Moree, v.31 sect.2 p.45; Atlas p.8 Zool. t.27 f.5 | 1888 @. peloponnesius, T. Stebbing in: Rep. Voy. Challenger, v. 29 p.147 | 1893 @. locusta (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 760. Pleon segment 5 with stiff dorsal shliniesi Eyes reniform. Antenna 1 shorter than antenna 2, the latter with calceoli. Gnathopods 1 and 2 subequal, subchelate. Peraeopods 1—5 rather long, equal. L. 13—16 mm. Greece. G. podurus Abildg. 1789 @. p., Abildgaard in: O.F. Müller, Zool. Dan., ed. 3 v.3 p.59 t.116 f. 1—6 | 1872 @.p., A. Boeck, Skand. Arkt. Amphip., v.1 p.38 | 1793 Cancer (Gammarellus) p., J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p.119 t. 35 f.6 | 1830 Amphithoe podura, H.-Milne Edwards in: Ann. Sei. nat., v.20 p.376 | 1862 Pherusa p., Bate, Cat. Amphip. Brit. Mus., p.145 | 1893 Gammarus locusta (part. ), A Della Valle in: F. Fl. Neapel, v.20 p. 759. Pleon segments 4 and 5 with dorsal spinules.. Antenna 1 apparently shorter than antenna 2, with no accessory flagellum (in figure). Gnathopods 1 and 2, 6th joint oval, not very large. Oeresund. 'G. savii M.-E. 1830 @. s., H. Milne Edwards in: Ann. Sei. nat., v.20 p.369 | 1862 Moera s., Bate, Cat. Amphip. Brit. Mus., p.191 | 1895 Maera? s., A. Della Valle in: F. Fl. Neapel, v.20 p.731. Not a species of Gammarus. Pleon segment 4 dorsally produced to an acute tooth, the other pleon segments perfeetiy smooth. Pedünele of antenna 2 reaching much beyond that of antenna 1. Gnathopod 1 very small. Gnathopod 2 much larger, but still small, much as in G. loeusta (p. 476). Uropods 1—3 reaching equally far back. Uropod 3 very short, rami very small, stiliform. Telson a little horizontal plate. North-Atlantie (coasts of la Vendöe [France)). G.sp., Viv. 1805 @. longicornis (non J. ©. Fabrieius 1779!), Viviani, Phosphor. Maris, p.8 t.2 f.3,4 | 1888 @. 1., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.76 f. | 1893» Dexamine gibbosa (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 578. Antennae 1 and 2 very long and slender, each with 2 long joints in peduncle. % Antenna 1 the longer. Uropods 1—3, rami laminar, elliptic. Colour yellowish. # : Genoa. In weedy bays. Das Tierreich, 21. Lief.: T. R. R. Stebbing, Amphipoda 1. 33 ı 1%) = 5 . EG x ur = 514 Gammaridarum species incertae sedis, Dexaminidae, Dexamine G.sp., Risso 1826 G. marinus (non Leach 1815!), A. Risso, Hist. nat. Eur. merid., v.5 p.96 | 1888 @. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 128. Colour intense grey, with deep grey dots, antennae and legs paler. Mediterranean. 3l. Fam. Dexaminidae 1813/14 Dexameridae, Leach in: Edinb. Ene., ©. 7 p.432 | 1876 Subfam. Dex- aminae, A. Boeck, Skand. Arkt. Amphip., v.2 p.810 | 1888 Dexaminidae, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 573, 900 | 1893 Dexaminidi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 556. Pleon segments 5 and 6 coalesced. Antenna 1 with long 24 joint, without accessory flagellum. Upper lip rounded. Lower lip varying. Mandible (Fig. 90 p. 520) without palp. Maxilla 1 varying, inner plate with only 1 or 2 setae or setules. Maxilla 2, inner plate the smaller, not fringed on inner margin. Maxillipeds (Fig. 92 p. 522), outer plates very long, palp rather short, finger small or wanting. Gnathopods 1 and 2 feeble, sub- chelate. Peraeopods 1—5, fingers of all commonly pointing backward. Uropod 3, rami subequal, extending beyond uropod 2. Telson elongate, deeply cleft. Marine. 5 genera, 10 accepted species and 5 doubtful. Synopsis of genera: Maxillipeds, palp 3-jointed; lower lip with 1 inner lobes rudimentary — 2, Maxillipeds (Fig. 92), palp 4-jointed; lower lip with inner lobes well developed — 8. Peraeopods 1—5, 4th joint shorter than ö5th 0 and BR Some: 5 a 1. Gen. Dexamine. . . p.514 Peraeopods 1—5, 4th joint longer than 5th and DR onnbaad N 7, a 2. Gen. Tritaeta.. : . p.517 3 ! Maxzilla 1, palp 1-jointed ......... 3. Gen. Paradexamine . p.518 Maxilla 1, palp 2-jointed — 4, Maxilla 1, 2d joint of palp large; maxillipeds, A inner plates well developed .. .... . 4. Gen. Polycheria . . p.519 Maxilla 1, 24 joint of palp small; maxillipeds (Fig. 92), inner plates rudimentary.. . . . 5. Gen. Guernea. . . . p.521 1. Gen. Dexamine Leach 1813/14 Dexamine (Sp. un.: D.spinosa), Leach in: Edinb. Ene., v7 p.482 | 1888 D., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 945 | 1893 D.(part.), A. Della Valle in: F. Fl. Neapel, v.20 p.572 | 1894 D., G. O.Sars, Crust. Norway, v.1 p.473 | 1846 Dexamene, L. Agassiz, Nomenel. zool., Index p. 121 | 1851 Amphithonotus (part.), (A. Costa in:) F. W. Hope, Cat. Crost. Ital., p.45 | 1861 Amphitonotus, E. Grube, Ausfl. Triest, p. 136. Body rather stout in Q ; some segments with dorsal projections. Head, rostral projection very small, post-antennal corners obsolete. Side-plates of moderate size. Antenna 1 with long peduncle, in © longer than antenna 2. R 2: N Dexamine 515 Lower lip with rudimentary inner lobes. Mandible, spine-row very small. Maxilla 1, inner plate with 1 seta, outer with 11 spines, palp’s single joint rather large, apically smooth on one maxilla, denticulate on the other. Maxilla 2 rather small, armed only at the apices. Maxillipeds, inner plates rather small but well developed, outer plates almost covering the slender 3-jointed palp, fringed with spine-teeth on inner margin. Gnathopod 2 rather longer than 1°. Peraeopods 3—5, 24 joint successively less expanded. Uropod 3, rami narrowly lanceolate. 4 species accepted, 4 doubtful. Synopsis of accepted species: 1 Pleon segment 3 dorsally unidentate — 2. H Pleon segment 3 dorsally tridentate — 3. 0 Peraeopod 5, 24 joint laminar . . ..... 1. D.spinosa . ... . p. 515 Peraeopod 5, 2d joint sublinear. .. . . . . 2 DB; ?2.3 0 p. 516 3 ! Pleon segment 2 triearinate . . ».»..... 3. D. spiniventris . . . p.516 Pleon segment 2 not triearinate ..... . 4. D. blossevilliana . . p.517 1. D. spinosa (Mont.) 1813 Cancer (Gammarus) spinosus, Montagu in: Tr. Linn. Soe. London, v.11 p.3 t.2 f.1 | 1818 @.s., Lamarck, Hist. An. s. Vert., v.5 p.181 | 1813/14 Dexamine spinosa, Leach in: Edinb. Ene., 0.7 p.432 | 1862 D. s., Bate & Westwood, Brit. sess. Crust., v. 1 p.237 f. | 1862 D. s., Bate, Cat. Amphip. Brit. Mus., p.180 t.24 f.1 | 1876 D.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.312 t.11 £.5 | 1893 D. s. (part.), A. Della Valle in: F. Fl. Neapel, ».20 p.573 t.5, 12; t.18 f£.1—17, 19 | 1893 & 94 D. s., G. O. Sars, Crust. Norway, v.1 t.166 £.2; t.167; p.475 | 1840 Acanthonotus? s., H. Milne Edwards, Hist. nat. Crust., v.3 p.25 | 1855 Amphithoe s., Gosse, Man. mar. Zool., v.1 p.141 f.266 | ?1826 Atylus corallinus, A. Risso, Hist. nat. Eur. merid., v.5 p.99 | 1830 Amphithoe marionis, H. Milne Edwards in: Ann. Sci. nat., v. 20 p.375 | 1857 Amphithonotus m., A. Costa in: Mem. Acc. Napoli, v.1 p.195 | 1843 Amphitho& tenuicornis, H. Rathke in: N. Acta Ac. Leop., 0.201 p.77 t.4 f.3| 1859 Gammarus speciosus (laps., corr.: @. spinosus) + Dexamine t., R.M. Bruzelius in: Svenska Ak. Handl., n. ser. ©.3 nr.1 p.79 | 1851 Amphithonotus acanthophthalmus, (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p.45 | 1868 Dexamine spiniventris var. pontica, Özerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.111 t.8 f.16 | 1898 D. spinosa var.?, Sowinski in: Möm. Soc. Kiew, v.15 p.490 t.12 £.5, 6. : Peraeon robust, pleon carinate, segments 1—4 each produced to a strong dorsal tooth, hinder part of segments 5 and 6 with 3 small dorsal ridges each ending in a small tooth. Head, rostrum short, blunt at apex, lateral corners triangular, acute. Side-plate 1 a little concave in front, 4! deeper than the rest. Pleon segment 3, postero-lateral corners sharply produced. Eyes oblong reniform, larger in S than in Q, dark brown with whitish coating. Antenna 1, 1° joint produced to an obtuse tooth (or acute, Sowinski), 2% much narrower and over once and a half as long, 34 very short (or not very short, Sowinski), flagellum about twice as long as peduncle, 30—45-jointed. Antenna 2 in © shorter, in JS longer than antenna 1, ultimate joint of peduncle longer than penultimate, flagellum filiform. Gnathopod 1, 24 joint eurved, 5th shorter than 6'%, widened distally, 6! expanding to the palm which is oblique, as long as hind margin, well defined by the palmar spines at the obtuse angled junction. Gnathopod 2, 24 joint longer, curved, 5tk Jittle widened distally, as long as 6%, which is similar to that of gnathopod 1 but longer. Peraeopods 1 and 2 alike, 6! joint longer than 5tk, finger rather strong. Peraeopods 3—5, 6" joint shorter than 5th, Peraeopod 3, 24 joint oblong oval, lower hind corner produced in a rounded 33% 516 Dexamine lobe, 4" joint subfusiform, much broader and longer than 5tt. Peraeopod 4, 24 joint piriform, abruptly narrowed below, 4 as long as 5th. Peraeopod 5 rather shorter, 29 joint oval, narrowest below, 4" shorter than 5". Branchial vesicles pleated. Uropod 3, rami about twice as long as peduncle Telson thrice as long as broad, cleft to ®/, length, each half with 3 lateral spines and 1 on obtuse apex. Colour a mixture of chestnut-brown, pink, light yellow and pure white (Sars), sometimes brilliant with mingled green and red. L. 9 reaching 14 mm, © rather smaller. Aretie Ocean, North-Atlantie with adjoining seas (Europe from Vadsö to the Black Sea; Azores). Within tide-marks to 75 m. 2. D. thea Boeck 1861 D.t., A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 658 | 1876 D.t., A. Boeck, Skand. Arkt. Amphip., v.2 p.315 t.12 f.1 | 1885 D.t., J.S. Schneider in: Norske Selsk. Skr., 1884 p.20 t.2 | 1898 D.t., D. spinosa (part.)?, A Della Valle in: F. Fl. Neapel, v.20 p.579 | 1893 & 94 D.t., G. O. Sars, Crust. Norway, v.1 1.168 f.1; p.477 | 1862 D. tenuicornis (err., non Amphithoe t. H. Rathke 1843!), Bate & Westwood, Brit. sess. Crust., v.1 p.240 f. | 1871 .D. heibergi, A. Boeck in: Forh. Selsk. Christian., 1870 p.187 | 1876 D. h., A. Boeck, Skand. Arkt. Amphip., p. 316 t.12 £.3. Peraeon, pleon and head nearly as iD. spinosa (p.515), Bi eyes smaller, oval. Antenna 1, 1° joint not apically produced, 34 joint not extremely short, flagellum 16-jointed. Antenna 2 in 9 much shorter, ultimate joint of peduncle subequal to penultimate (Sars) or shorter than it (Schneider), flagellum little longer than pedunele, 11-jointed. Gnathopods 1 and 2 and peraeopods 1 and 2 nearly as in D. spinosa. Peraeopod 3, 24 joint with hinder margin and lower lobe subangular, 4! much longer and broader than 5tk, 5th sliehtly shorter than 6, Peraeopod 4, 24 joint little longer than broad, very convex behind, and finely serrate, 4tk longer than 5th, 5tk than 6th, Peraeopod 5, 24 joint almost linear, 5th Jonger than 4% or 6th, finger strong in this and the other peraeopods. Branchial vesieles simple. Uropod 3, rami twice as long as peduncle, rather narrow. Telson not quite thrice as long as broad, celeft nearly to the base, spines as in D. spinosa, with addition of 2 subdorsal pairs. Colour yellowish, semipellucid, mottled with brown and pink. L. 4—6 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (from Vadsö to Christiania- fjord; north of Great Britain; France); Kattegat. Depth to 113 m. 3. D. spiniventris (A. Costa) 1853 Amphithonotus s., A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.173 | 1857 A.s., A. Costa in: Mem. Ace. Napoli, v.1 p. 186 t.2 f.1 | 1864 Dexamine s., E. Grube in: Arch. Naturg., 0.301 p.195 | 1866 D.s., Cam. Heller in: Denk. Ak. Wien, ©.2611 p.80 | 1893 D. spinosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 573 t.5 £.9; 1.18 £. 18. Pleon moderately robust, pleon segments 1—4 and 6 carinate, each produced to a dorsal tooth, in segment 4 and sometimes in 3 preceded by a smaller tooth, segments 1—3 and 6 having a pair of latero-dorsal ridges ending in small teeth, sometimes obsolete on segment 1, the part ofthe coalesced segment corresponding to segment 5 separated as usual from segment 6 by a depression. Head, rostrum very short, lateral corners angular. Pleon segment 3, postero-lateral corners sharply produced. Eyes reniform, not very large. Antenna 1, 1° joint produced to a sharp tooth, 24 less than double as long as 1° (Della Valle; Heller: thrice), flagellum 40—50-jointed. Antenna 2 shorter (at least in ©), ultimate joint of pedunele longer than penultimate, flagellum about 40-jointed. Gnathopods 1 and 2 and peraeopods 1—5, uropods and telson much as in D. spinosa (p. 515). Colour dull yellow. L. 7-8 mm. Mediterranean. T a a ee re k b ! EN Da EN 7 a 1 Des E ” 4 Dexamine, Tritaeta 517 4. D. blossevilliana Bate 1862 D.b., Bate, Cat. Amphip. Brit. Mus., p. 131 bu24f. 2 | 1893 D. spinosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 573. Very near to D. spinosa (p. 515), but distinguished as follows. Pleon segment 3 with a strong dorsal tooth on each side of the central one; segment 4 (in figure) with a small dorsal tooth in front of its apical one. Eyes very large, quadrate. Telson very long, eleft nearly to the base, each external margin carrying 4 fasciculi of hairs, each apex serrated and carrying a subapical spine. L. 10 mm. Habitat unknown. D. anisopus (Grube) 1861 Amphithöe (Amphitonotus) a., E. Grube, Ausfl. Triest, p-136 | 1864 Dexamine a., E. Grube in: Arch. Naturg., v.30ı p.197 | 1893 D. spinosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 573. Probably identical with D. spiniventris; but peraeopods 1 and 2 not ymmetrical. L. over 6 mm. Adriatie. D.leptonyx (Grube) 1861 Amphithöe (Amphitonotus) l., E. Grube, Ausfl. Triest, p- 136 | 1864 Dexamine l., E. Grube in: Arch. Naturg., v. 301 p.198 | 1893 Atylus? l., A. Della Valle in: F. Fl. Neapel, v.20 p. 703. Probably identical with D. spinosa (p.515); but 1st joint of antenna 1 is said to be unarmed. L. 8 mm. Adriatic. D. miersii Hasw. 1885 D.m., Haswell in: P. Linn. Soe. N. S. Wales, v.10 p- 102 t.13 f.8—12 | 1893 D. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 578. Torres Strait (Thursday Island). D. scitulus Harford 1877 D.s., Harford in: P. Calif. Ac., v.7 p.116 | 1893 D.s., A. Della Valle in: F. Fl. Neapel, v.20 p. 579. Magdalena Bay [Lower California]. Depth 11 m. 2. Gen. Tritaeta Boeck 1871 Lampra (Sp. un.: L. gibbosa) (non Jaec. Hübner 1816, Lepidoptera!), A. Boeck in: Forh. Selsk. Christian., 1870 p.188 | 1876 Tritaeta, A. Boeck, Skand. Arkt. Amphip., v.2 p.817 | 1888 T'. (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 941 | 1894 & 95 T., G. O. Sars, Crust. Norway, v.1 p. 478, 698. Body rather stout in Q, only pleon segment 4 dorsally produced. Head, rostrum almost obsolete. Side-plates shallow, some of irregular angular form. Antennae 1 and 2 subequal; antenna 1 with long pedunele. Mouth- parts and gnathopods 1 and 2 nearly as in Dexamine (p. 514), Peraeopods 1—5 strong, subequal, 4 joint very long, 5tk and 6tk short, the spiniferous widening of the 5% joint giving all a subchelate character. Peraeopods 3—5, 24 joint not much expanded, least in peraeopod 5. Uropods as in Dexamine. l species. 1. T. gibbosa (Bate) ?1861 Amphithöe brevitarsis, E. Grube, Ausfl. Triest, p. 185 | 1864 Dexamine b., E. Grube in: Arch. Naturg., v. 301 p. 196 ! 1862 Atylus gibbosus, Bate (& Westwood), Brit. sess. Crust., v.1 p.248 f. | 1862 A.g., Bate, Cat. Amphip. Brit. Mus., p. 137 t.26 f.3 | 1871 Lampra gibbosa, A. Boeck in: Forh. Selsk. Christian., 1870 p.188 | 1876 Tritaeta g., A. Boeck, Skand. Arkt. Amphip., 0.2 p.318 t.12 f.2 | 1890 T.g., A. O. Walker in: P. Liverp. biol, Soe., v.4 p.249 t.16 f.4,6| 518 Tritaeta, Paradexamine 1893, 94 & 95 T. g., G. O. Sars, Crust. Norway, v.1 t.168 f.2; p.479; p.698t.vuıf.1| 1895 T. g., A.O. Walker in: P. Liverp. biol. Soe., v.9 p. 306 | 1881 Dexamine dolichonyx, Nebeski in: Arb. Inst. Wien, ©.3 p.145 t.13 f.40 | 1888 Tritaeta d., T. Stebbing i in: Rep. Voy. Challenger, v.29 p. 520, 941, 945. Pleon segments 1—3 in J slightly raised dorsally. Side-plates 1 and 2 subquadrate, 3% and 4" acutely produced at the lower corners, 5% with front lobe the deeper, rounded. Pleon segment 3, postero-lateral corners acute, not greatly produced. Eyes large, rounded oval, larger in d, reddish brown with whitish coating. Antenna 1 long, 1° joint much shorter than 24, flagellum twice as long as peduncle, about 18-jointed. Antenna 2 in © scarcely so long, ultimate joint of peduncle shorter than penultimate, flagellum about 18-jointed; in S longer than antenna 1, penultimate and antepenultimate joints of pedunele densely fringed above, flagellum about 24-jointed. Gnatho- pod 1, 5th joint distally widened, rather shorter than 6%, which is a short oval, widening to the palm; palm slightly oblique, fairly well defined. Gnatho- pod 2 longer, 5{R joint slender, little widened distally, quite as long as 6th, which is longer and more slender than in gnathopod 1. Gnathopod 1 often has a deep sinus in the front margin of the 6! joint in J and at least occasionally also in O, perhaps a copulatory feature. Peraeopods 1—5, 4th joint longer than 5tk and 6!" combined, 5tt armed with 5 strong spines on expanded extremity; 6® rather longer in peraeopods 1 and 2, equal or shorter in 3d—5%, in all faeing backward, not expanded distally; finger strong and curved. Peraeopod 3, 24 joint narrowly oblong oval, in peraeopod 4 narrower, with angular projection proximally, in peraeopod 5 sublinear, slightly widened proximally. Branchial vesicles simple in ©, pleated in 9. Uropod 3, rami scarcely twice as long as peduncle, narrowly lanceolate, spinose. Telson rather over twice as long as broad, cleft nearly to base, in © with 3 marginal and 3 submarginal spines on each side, and 1 spine on each obtuse apex, in d with an additional marginal spine (Sars). Colour dark brownish with opaque white patches. L. 6 mm. North-Atlantie and North-Sea (Norway, France, British Isles, Azores); Mediterranean. 3. Gen. Paradexamine Stebb. 1899 Paradexamine (Sp. typ.: Dexamine pacifica), T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210. In general character like Dexamine (p. 514), but distinguished as follows. Lower lip with inner lobes well developed and mandibular processes upturned. Maxilla 1 with the 1-jointed palp uniform in left and right maxilla. Maxillipeds with small distinet finger to the palp. 1 species. 1. P. pacifica (G. M. Thoms.) 1879 Dexamine p., &. M. Thomson in: Tr.N. Zealand Inst., v.11 p.238 t.10» f.4 | 1886 D.p., G. M. Thomson & Chilton in: Tr. N. Zealand Inst., v. 18 p. 149 | 1899 D.p., Paradexamine sp. typ., T. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210 | 1893 .D. spinosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 574. Peraeon and pleon segment 1 dorsally rounded, pleon segments 2—4 carinate, segment 1 sometimes produced to a dorsal tooth or 3 teeth, segments 2 and 3 produced to 3 large dorsal teeth, largest in segment 3, segment 4 produced into a large tooth slightly upturned at the acute apex, a dorsal ELIIRE IR . ” Paradexamine, Polycheria 519 depression on 34, 4th and the coalesced segments, the latter carıying 1 or 2 pairs of spines, and having the dorsal and lower apices acute on each side of base of telson. Head, rostrum small, acute, slightly depressed, lateral corners produced into a small acute point. Side-plates of moderate size. Pleon segments 2 and 3, postero-lateral corners acutely produced. Eyes reetangular oval, remaining dark in spirit. Antenna 1 long, 1% joint stout (Thomson: with a tooth at the end), 24 varying from little longer to nearly twice as long; flagellum with 40—50 joints, 1%? sometimes longer than 34 of pedunele. Antenna 2 about °/, length of antenna 1, slender, ultimate joint of peduncle about half as long as penultimate, flagellum with 25—30 joints, several rather long. Upper lip with 2 hairy lobes, which fold one on the other (at least when the lip is detached). Lower lip with principal lobes broad, the mandibular processes not as usual produced backward, but represented only by a small acute process direeted forward. Mandible, eutting edge with a straight piece ending in 3 teeth, accessory plate divided into many denticles, spine-row of 2 or 3 very small spines, molar with slender spines fringing one border of the right mandible, palp entirely wanting. Maxilla 1, inner plate with 1 or 2 setules, outer plate with 11 spines, palp with about a dozen flexible spines. Maxilla 2, inner plate shorter and narrower than outer, ‚each with slender spines on oblique apex. Maxillipeds, inner plates of moderate size, with many slender spines but seemingly without the 3 stout spine-teeth commonly found on the apex, outer plates long, about reaching middle of palp’s 39 joint, with spine-teeth on inner margin and slender spines on outer. Gmathopods 1 and 2, 5t" joint longer than 6", 6th with row of spines along inner surface, widening a little to palm, which is oblique, microscopically pectinate, well defined by palmar spines, finger with subapieal tooth. Gnatho- pod 2 rather the longer. Peraeopods 1 and 2 slender, 5t" joint shorter than 4*h, Peraeopod 3, 24 joint broad oval, hind margin smooth, 4 joint longer and 5th shorter than 6'", Peraeopod 4, 24 joint much narrowed below, 4" longer | than 5%, 5th Jonger than 6%, Peraeopod 5, 24 joint much smaller than in preceding peraeopods, narrowed below, 4% and 5!" joints subequal; finger curved, rather strong in all the peraeopods. Uropod 1 rather long, outer ramus little shorter than inner; uropod 2, outer ramus shorter than inner; uropod 3, rami short, subequal. Telson reaching beyond uropod 3, deeply eleft. L. reaching 8 mm. South-Pacifie (New Zealand; Jervis Bay [East-Australia]). 4. Gen. Polycheria Hasw. 1879 Polycheria, Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.345 | 1893 P., A. Della Valle in: F. Fl. Neapel, v.20 p.579 | 1881 Polychiria, E. v. Martens in: Zool. Rec., v.16 Crust. p.31 | 1882 Polycheria, Polychelia, G. M. Thomson in: Tr. N. Zealand Inst., v.14 p.233 | 1898 Polycheria, Polycharia, Calmaı in: Ann. N. York Ac., v.11 p. 261, 268, 288. % Agreeing with Tritaeta (p. 517), but distinguished as follows. Lower | . lip with well formed inner lobes. Maxilla 1 with 2-jointed palp. Maxilli- - peds having a small distinet finger to the palp. Peraeopods 1—5 (Fig. 91 p. 520) having the 5'" joint linear and the 6!" expanded distally, to form a distinet concave palm. Telson with acute apices. 2 species. Synopsis of species: Side-plate 4, front lobe subaeute . . . : . 2.2 2 2... 1. P. antarctica . p. 520 Side-plate 4, front lobe short, blunt. ... 2... 2. P.tenuipes . .p.520 520 3 Polycheria 1. P. antarctiea (Stebb.) 1875 Dexamine a., T. Stebbing in: Ann. nat. Hist., ser. 4 v.15 p.184 t. 154 f.1 | 1878 Atylus antarcticus, T. Stebbing in: Ann. nat. Hist., ser.5 v.2 p.870 | 1893 Polycheria antarctica, A. Della Valle in: F. Fl. Neapel, v.20 p.580 t.58 f. 83, 84 | 1888 Tritaeta a. + T. kergueleni, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 941; p. 941 t. 83. Pleon segments carinate except front part of segment 1, 4!" produced to a dorsal tooth, 6 raised on each side of base of telson. Head, rostrum obsolete. Side-plates 1 and 2 rather produced and acute at lower front corner, 34 and 4 with subacute lobe in front. Pleon segment 3, postero-lateral corner forming a short acute tooth, which is sometimes obsolete. Eyes large, rounded oval, and (Haswell) red. Antenna 1, 1° joint scarcely half as long as 24, 34 very short, flagellum rather longer than peduncle, with 20 joints, most with long sensory filaments. Antenna 2 in O equal to antenna 1; ultimate joint of peduncle rather shorter than penultimate, flagellum shorter than peduncle, 11-jointed. Upperlip broadly \\NI and smoothly rounded. Mandible % \yyH Ge (Fig. 90), spine-row with 3 spines on AN left, 2 on right mandible. Maxilla 1, N . inner plate with 2 setae, outer with 10 5 spines, palp with slender spines on - \ apex, 1% joint very short, 24 very asjoint -------- “es long. Maxilla 2, a few setae on R inner margin of inner plate. Maxilli- peds, outer plates very large, reaching 4% joint --—— --- beyondmiddleof3djoint of palp, inner margin fringed with about 20 small spine-teeth. Gna- thopod 1, 5% joint ‚subfusiform,longerthan joint = the 6®h, 6th short oval, _/ palm not very oblique, \ N Fig. 90. N P. antaretica. finely pectinate, well Fig. 91. P. antarctica. "Left mandible. defined, 4th__6th j oints Peraeopod 1. with long spines-on hind margin, 6!" with them also on front. Gnathopod 2 similar, but 24, 4th, 5 and 6% joints longer. Peraeopods 1—5 nearly alike; 24 joint in peraeopods 1 (Fig. 91) and 2 broader, not longer than 4*, in 34 to 5th a little widened proximally, and a little longer than 4b; in all peraeopods dh as long as 5i and 6!" combined, 6tk in peraeopods 1 and 2 rather longer than 5#", in all peraeopods 6% with inner margin produced into a tooth tipped with 2 spines, against which the much curved finger impinges. Branchial vesicles simple in ©, pleated in d. Uropod 3, outer ramus shorter than inner (Stebbing), or rami equal (Haswell). Telson elongate, cleft nearly to the base, with several marginal spines, apices tipped each with a spine. ‘ Colour yellowish. L. 3—8 mm. Antaretie Ocean (lat. 770 80° S., depth 548 m, in sponge); South-Paeifie (Port Jackson [East-Australia], depth 4 m; Paterson Inlet [New Zealand]. depth 19 m); southern Indian Ocean (Kerguelen, depth 51 and 232 m). 2. P. tenuipes Hasw. 1879 P.t. + ?P. brevicornis, Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.845 t.22 f.8; p.346 | 1882 P. obtusa, G. M. Thomson in: Tr. N. Zealand Inst., u. 14 p.233 t.17 f.3 | 1898 P. osborni, Polycharia o., Calman in: Ann. N. York Ac., „11 p.268 t.32 f.2; p. 288. >; nk 3 Tara = Polycheria, Guernea 521 Closely resembles P. antaretica, but differs in the following respects. Dorsal processes of pleon segments 4 and 6 much less prominent. Side- plate 4 with anterior process reduced to a short blunt lobe. Maxilla 1 with 1° joint very short, 24 very long (1-jointed: Calman). Maxillipeds with outer plates longer, nearly equalling paip, and armed with only about 11 spine-teeth on inner margin. Gmathopod 1 with palmar edge very short, not more than !/, as long as finger; gnathopod 2 with 6% joint twice as long as broad, palmar edge about '/, as long as finger. Peraeopod 3 with front and hind margins of 6% joint nearly parallel, and thumb-like process much less prominent. L. © 7 mm. Puget Sound. 5. Gen. Guernea Ühevreux 1868 Helleria (Sp. un.: H. coalita) (non Ebner 1868, Isopoda!), A. M. Norman in: Ann. nat. Hist.. ser.4 v.2 p.418 | 1887 Guernea, Chevreux in: Bull. Soe. zool. France, v.12 p.302 | 1890 @., T. Stebbing in: Ann. nat. Hist., ser.6 v.5 p.192 | 1893 @., A. Della Valle in: F. Fl. Neapel, v.20 p. 570 | 1887 Prinassus (Sp. un.: P. nordenskiöldii), H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p.82. Pleon segments 5 and 6 coalesced, abruptly truncated behind. Head, rostrum obsolete. Side-plate 5 the largest. Antenna 1 in d much shorter than antenna 2. Upper lip rounded. Lower lip with inner lobes well developed. Mandible, eutting edge obscurely dentate, with accessory plate but no apparent spine-row, molar represented by a laminar fold. Maxilla 1, inner plate with 1 setule, outer with 7 spines, palp with 1° joint slightly longer than 24. Maxilla 2, inner plate with 2 (1?) setae, outer plate longer, with a few setae. Maxillipeds, inner plates rudimentary, outer plates reaching middle of 34 joint of palp, fringed with spine-teeth on distal part of inner margin, finger of palp small. Gnathopods 1 and 2, 6th joint subquadrate. Peraeo- pods 1 and 2, 4th joint much longer than 5th; 24 joint smaller in peraeo- pod 4 than in 3 or 5; peraeopod 5 with 4th and 5th joints wide and plumose. Uropod 3, rami lanceolate, not much longer than peduncle. Telson rather longer than broad. 2 species accepted, 1 doubtful. Synopsis of accepted species: Gnathopod 1, 6th joint deeidedly longer than broad; peraeopod 5, 24 joint much narrowed distally. . . 1. @. coalita. ... . p: 521 Gnathopod 1, 6th joint scarcely longer than broad; peraeopod 5, 24 joint little narrowed distally. . . 2. G. nordenskiöldii . p. 522 1. G. coalita (Norm.) 1868 Helleria c., A. M. Norman in: Ann. nat. Hist., ser. 4 v.2 p.418 t.22 f.8; t.23 f.1—6 | 1888 Guernea c., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.595, 596, 386 | 1895 @. e. (part.), Chevreux & E. L. Bouvier in: Ann. Sei. nat., ser. 7 v.15 p.123 | 1893 @. e. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.570 t. 31 f.20—33; t.58 £.80 | 1887 @.c. + @.laevis, Chevreux in: Bull. Soc. zool. France, v.12 p.803 £.1,2; p.328. ° Peraeon dorsally rounded, pleon somewhat compressed, with strongly marked dorsal division between segments 3 and 4, segments 5.and 6 completely fused, but with a dorsal depression between two humps which, like segment 4, are serrate; telson attached to the lower margin of the steeply truncate back of the compound segment. Head, lateral corners obtusely produced. Side-plates 1—4 not very large, successively larger, lower margin rounded, narrow, subserrate, 5tk large, the hind lobe deeper than side-plate 4; side-plate 7 522 Guernea larger than 6tk, Pleon segment 3, postero-lateral corners rounded. Eyes round. Antenna 1 in ©, 1° joint stout, not much longer than 24, 34 short, flagellum shorter than the short peduncle, 7-jointed, in S 1° joint of peduncle shorter than 24, flagellum rather longer than pedunele, about 9-jointed. Antenna 2 in Q equal to antenna 1, ultimate joint of pedunele much narrower and shorter than penultimate, flagellum 8- or 9-jointed, m JS ultimate and penultimate joints of peduncle subequal, flagellum slender. Upper lip flatly rounded, smooth. Lower lip, prineipal lobes with an acute apex, inner lobes prominent, mandibular processes obsolete. Maxilla 2, inner plate with well rounded apex. Gnathopod 1, 24 joint very narrow and bent at the base, 5tR joint a little shorter than 6%, 6th decidedly longer than broad, widening a little distally, palm scarcely oblique, well defined, a little convex, finger shutting closely upon it. Gmathopod 2 similar, but base of 24 joint little ‘bent, less narrow, 5% rather longer than 6t", 6th Jonger and less widened than in gnathopod 1. Peraeopods 1 and 2, 6tk joint narrower but longer than 5tk, Peraeopod 3, 24 joint greatly expanded below, bowed out in front, 4" rather dilated, following joints slender. Peraeopod 4, 2° joint much smaller, piriform, widest above, other joints nearly as in peraeopod 3. Peraeopod 5, 24 joint very large, straight in front, very convex behind, narrowed below, 4!" and 5th expanded, with setae on both margins, 6'h very slender. The hexagonal markings of the integument are very conspicuous on the expansion of 24 joint in peraeopods 3—5. Uropods 1 and 2 rather small, rami shorter than peduncle, inner ramus shorter than outer, each tipped with a spine. Uropod 3, rami equal, not long, but longer than peduncle, smooth in ©, with plumose setae in C. Telson ovate, cleft almost to the base. Colour yellow with red and greenish dots and bands. L. 1'25—2 mm. North-Atlantie and North-Sea (Shetland; Moray Firth; Firth of Clyde; Irish sea; Croisie; Saint-Jean-de-Luz); Mediterranean (Cannes; Naples). 2. G. nordenskiöldii (H.“J. Hansen) 1887 Prinassus n., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.82 t.2 f.7; t.3 £.1 | 1890 Guernea coalita (part.)?, T. Stebbing in: Ann. nat. Hist., ser.6 v.5 p.193 | 1893 @. c. (part.), Chevreux & E. L. Bouvier in: Ann. Sei. nat., ser.7 v.15 p.123 | 1893 @..c. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.572. Like G. coalita (p. 521), but distinguished as follows. Pleon segments 4—6 more strongly carinate, the compound. segment not dorsally depressed or serrate. Antenna 1, flagellum 6-jointed; antenna 2, flagellum 3-jointed. Gmathopod 1, 6! joint scarcely longer than broad, much widened to the rather oblique palm, 6! joint in gnathopod 2 rather longer but otherwise nearly as in gnathopod 1. Peraeopod 5 with 24 joint narrower below than above, but still broadly rounded below. L. 3'3 mm. Davis Strait (Sukkertoppen, depth 113 m, and Christians- haab, depth 28—56 m [Greenland]). G. flindersi (Stebb.) 1888 Dexamine f., T. Stebbing in: Rep. Voy. Challenger, v.29 p.946 t.187c | 1893, A. Della Valle in: F. Fl. Neapel, v.20 p. 578. Fig. 92. G. Glädeset. Perhaps to be referred to an independent genus. Maxilliped. Maxillipeds (Fig. 92), inner plates rudimentary, outer very large, completely covering the 4-jointed palp, seemingly fused in the basal half, then armed each with 3 or 4 interlocking spine-teeth and finally serrate and armed with 5 long curved spines; finger of palp very small. L. very small. Flinders Passage [East-Australial. Depth 15 m. EEE OR REISE a EI 118 6 u Seren Talitridae 523 32. Fam. Talitridae 1813/14 Orchestidae, Leach in: Edinb. Ene., v.7 p.432 | 1853 O., J. D. Dana in: U. S. expl. Exp., v.1311 p. 826, 846 | 1857 Subfam. Talitrini, A. Costa in: Mem. Ace. Napoli, v.1 p.173 | 1862 Orchestidae, Bate, Cat. Amphip. Brit. Mus., p.4 | 1871 O., A. Boeck in: Forh. Selsk. Christian., 1870 p.91| 1888 O., T. Stebbing in: Rep.Voy. Challenger, v.29 p. 602 etc. | 1890 Orchestiidae, G. ©. Sars, Crust. Norway, v.1 p.21 | 1893 Orchestidi, A. Della Valle in: F. Fl. Neapel, v.20 p.489. Head without pronounced rostrum, mouth-parts strongly projecting below. Side-plates 2—4 rather large, 5!" bilobed (side-plates I—4 often with a small backward projeetion near the top of hind margin). Antenna 1 usually much shorter than antenna 2, without accessory flagellum. Antenna 2 having the basal joint eoalesced with the head. Upper lip large, distally rounded, median line usually prominent. Lower lip without inner lobes. Mandible without palp, otherwise normal. Maxilla 1, inner plate slender, tipped with 2 plumose setae, outer plate with 9 apical spines, palp 1-jointed, small, from rudimentary to a length reaching base of spines of outer plate. Maxilla 2, both plates with apical fringe -of slender spines, which on the inner plate is bounded by a plumose seta on’ the inner margin. Gnathopod 2 in the C either feebly chelate or (more generally) strongly subchelate (Fig. 96, 97, 99 p. 565, 580, 583), in the © either feebly chelate or subchelate. Uropod 3 usually with a single ramus. Telson (Fig. 98, 100 p. 580, 583) usually short. Represented on almost all eoasts, chiefly between tide-marks or not far above .or below them, but sometimes reaching considerable heights inland; also found at sea, perhaps generally in connection with floating objects; of the fresh water forms some found down to considerable depths in lakes, others in streamlets up to very great heights. 13 genera, 101 accepted species and 45 doubtful. Synopsis of genera: 2. Gen. Talitroides . . p. 527 Pleopod 3 not degraded — 2. 1 Maxillipeds, 4th joint of palp wanting or quite rudimentary — 3. Maxillipeds, 4th joint of palp distinet — 6. Gnathopod 1 simple in the d — 4. Gnathopod 1 subchelate in the d — 5. Gnathopod 2 feebly chelate inthegd . .. . 1. Gen. Talitrus . . . p.524 Gnathopod 2 strongly subehelate in the d . . 3. Gen. Orchestoidea . p. 527 Gnathopod 1 (Fig. 98) subehelate in the @ . . 4. Gen. Orchestia . . p.530 Gnathopod 1 (Fig. 94) simple in theQ.. . . 5.-6Gen. Talorchestia . p. 543 | | | 5 Uropod 3, 1-jointed — 7. | | 2 3 4 5 {er} Uropod 3 (Fig. 98), not 1-jointed — 8. Telson partially eleft........ "u... 6. Gen.Ceina . . » . p.554 Boananine: ar a an, ea 7. Gen. Chiltonia . . p.555 Uropod 3 with two rami — 9. Uropod 3 (Fig. 98) with one ramus — 10. a re TFT 8. Gen. Parhyale. . . p.556 Tolsber le... va... BEE SEE 9. Gen. Neobule . . . p.556 Maxillipeds, 4th joint of palp not unguiform . 10. Gen. Parorchestia . p. 557 Maxillipeds, 4th joint of palp unguiform — 11. 7 oo 9 10 524 Talitridae, Talitrus the 4hinthd.....-.... 0... 11. Gen. Hyale... . p.559 Gnathopod 2 (Fig. 97) having the 5th joint produced between the 4th joint and 6th in l Gnathopod 2 having the 5th joint masked by 11 thed — 2. 19 Telson (Fig. 98) undivided . . .. 2.2... 12. Gen. Hyalella. . . p. 574 Telson (Fig. 100) more or less divided. . . . 13. Gen. Allorchestes . p.581 1. Gen. Talitrus Latr. 1793 [Subgen.] Gammarellus (part.), J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p.106 | 1802 Talitrus (part.), (Latreille in:) Bosc, Crust., v1 p.78; 0.2 p.148 | 1802 & 03 T. (part.), Latreille, Hist. Crust. Ins., v.3 p.38; v.6 p.294 | 1888 T', T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1682 | 1890 T., G. O. Sars, Crust. Norway, v.1 p.22 | 1891 T., T. Stebbing in: Ann. nat. Hist., ser.6 v.8 p. 324 | 1893 T., A. Della Valle in: F. Fl. Neapel, v.20 p.492 | 1835 Thalitrus, Guerin (-Möneville) in: Exp. Mor&e, Atlas p-3 | 1851 Subgen. Talitrorchestia (Sp. un.: Talitrus celoquetii), F. Brandt in: Bull. phys.-math. Ac. St.-Petersb., v.9 p. 137. Peraeon dorsally broad, pleon compressed. Side-plate 1 narrow, 5th broad and deep. Antenna 1 much shorter than peduncle of antenna 2. Antenna 2, basal joint or joints soldered to head, with no gland-cone, ultimate joint of pedunele the longest joint. Epistome forming an obtuse angle with upper lip. Upper lip distally rounded. Lower lip with tuft of setules at inner corner of prineipal lobes. Maxilla 1, palp minute, 2-jointed. Maxillipeds, palp rather short and broad, 4" joint wanting. Gnathopod 1 stronger than gnathopod 2, simple, 5t" joint strong but linear. Gnathopod 2 feeble and similar in both sexes, 5'" joint expanded proximally, 6tk produced beyond a minute chela-forming finger. Peraeopod 2 with short, notched finger. Peraeopods 4 and 5 with expansion only of 24 joint. Branchial vesicles twisted or bent. Marsupial plates small, lanceolate. Telson simple. 4 species accepted, 2 doubtful. Synopsis of accepted species: 1 ! Peraeopods 3 and 4, 2d joint narrowing distally . . 1. T. sylvaticus . p. 524 Peraeopods 3 and 4, 2d joint regularly expanded — 2. Antenna 1 reaching much beyond the penultimate 9 joint of peduncle of antenna 2 ........ 2. T. alluaudi . . p.525 Antenna 1 not reaching much beyond penultimate joint of peduncle of antenna 2 — 3. 3 | Antenna 2, peduncle stout .. . .». .- 2.22... 3. T. saltator . . p.525 Antenna 2, petuncle slender . .. .». . 2 2.2.2... 4. T. gulliveri. . p. 526 l. T.sylvaticus Hasw. 1879 T.s., Haswell in: P. Linn. Soe..N.S. Wales, v.4 p-246 1.7 f£.1 | 1885 T. s. (T. affinis, laps. corr.: T. assimilis); Haswell in: P. Linn. Soc. N.S.Wales, v.10 p.95 10 £.1| 1893 7. s., G.M. Thomson in: P. R. Soc. Tasmania, 1892 p.15 t.4 £.1—10 | 1893 T.s., A. Della Valle in: F. Fl. Neapel, v.20 p.512 | 1880 T. assimilis, Haswell in: P. Linn. Soc. N.S.Wales, 0.5 p.97 t.5 f.1| 1898 Orchestia sylvicola (err., non J.D. Dana 1852!), G.M. Thomson in: Tr. N. Zealand Inst., v. 31 p. 203. Side-plate 5 much the broadest. Eyes small, round. Antenna 1, 1° joint compressed, 24 the longest, 39 very short, flagellum rather shorter than peduncle. Antenna 2 rather long, ultimate joint of pedunele nearly twice as long as penultimate, flagellum longer than peduncle. Maxillipeds, palp with rudiment of a blunt terminal joint (Thomson). Gmathopod 1, 6% joint slender, tapering, finger (in figure) very small. Gnathopod 2, 4tk joint obtusely prominent, more so in © than in 9, 5th and 6th joints considerably longer in Q than Erz. in Talitrus 525 in d, apex of 6!" rather narrowly and shortly produced beyond the minute finger in both sexes. Peraeopods 1 and 2 subequal (Haswell; but in figure peraeopod 1 is considerably the larger). Peraeopod 3 much shorter than peraeopods 4 and 5; branchial vesicles much twisted. Peraeopods 3 and 4, 24 joint piriform, with scarcely any free corner. Peraeopod 5, 24 joint nearly as broad as long. Pleopods 1 and 2 feebly developed, 3% wanting(?). Uropod 3 very short, conical ramus ending in a single spine. Telson spinulose, very slightly emarginate at apex. Colour usually dark slate, oceasionally dull | yellow. L. 11 mm. E New South Wales (on moist ground in wood and serubs; at Rootyhill, over 50km from E coast); Tasmania (on Mount Koseiusko and to a height of 760 m on Mount Wellington). E 2. T. alluaudi Chevreux 1896 7. a., Cheyreux in: Feuille Natural., v.26 p.7 £.1—4. Body little compressed. Side-plate 5 large, as deep as the preceding. Eyes rather large, round. Antenna 1 very long, reaching beyond middle of ultimate joint of pedunele of antenna 2, flagellum as long as peduncle, 6-jointed. Antenna 2, antepenultimate joint of pedunele rather long, pen- ultimate joint ?/, as long as ultimate, flagellum shorter than pedunele, 9—11- jointed. Gnathopod 1 robust, 5t" joint distally widened, 6!" spinose, stout and short. Gmathopod 2, 5tk joint scarcely longer than 6%, which has the apex broadly rounded and considerably produced beyond the minute finger. Peraeopods 3 and 4, 24 joint narrowly oval. Peraeopods 4 and 5 short, robust. Peraeopod 5, 24 joint almost eireular. Uropods 1 and 2 normal. Uropod 3 extremely small, scarcely half as long as telson, peduncle with long apical spine, ramus minute, eonical, about half as long as peduncle. Telson large, quadrate, as broad as long, not emarginate, with 2 apical spines and 4 on each side L. Q 5—6, d 7 mm. Seychelles (in rotten trunks’ of cocoanut-trees and in the humus of forests); Paris (hot-houses of the Jardin des Plantes). 3. T. saltator (Mont.) 1766 Oniscus locusta (err., non Cancer I. Linne 1758)), Pallas, Mise. zool., p.191 t.14 f.15 | ?1777 Cancer l., Pennant, Brit. Zool., ed.4 v.4 p-21 | 1793 C. (Gammarellus) l., J. . W. Herbst, Naturg. Krabben Krebse, v.2 p.127 t.36 f.1 | 1802 Gammarus 1., Talitrus (part.), Latreille, Hist. Crust. Ins., v.3 p.39 | 1888 T. l., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1722 | 1890 7. I, G. ©. Sars, Crust. Norway, v.1 p.23 t.9 |'1893 7.1, A. Della Valle in: F. Fl. Neapel, v.20 p.492, 947 t.57 £.52, 53 | 1808 Cancer (Gammarus) saltator, Montagu in: Tr. Linn. Soc. London, ‚ %9 p.94 t.4 f.3 | 1830 Talitrus s., H. Milne Edwards in: Ann. Sei. nat., v.20 p. 364 | 1813/14 T.littoralis, Leach in: Edinb. Ene., v.7 p.402 | 1832 & 35 T. platycheles, T. » platichelis, Guerin (-Meneville) in: Exp. Moree, v.31 sect.2 p.44; Atlas p.3 Zool. t. 27 er i893 T. locusta forma mediterranea, Chevreux in: Bull. Soc. zool. France, v.18 p. 124. Body robust, in S rather elongate. Head, rostral point minute. Side- plate 1 triangular, 2?—4th quadrate, 5!" nearly as deep as 4, Pleon segment 3, postero-lateral corners quadrate. Eyes with dark pigment, irre- gularly rounded, often wider apart than their diameter. Antenna 1 about reaching end of penultimate joint of pedunele of antenna 2, 24 joint the longest, flagellum much shorter than peduncle, 7- or 8-jointed. Antenna 2 much longer in 9 than in 9, ultimate joint of peduncle much longer than penultimate, narrowest at base, flagellum subequal to peduncle, with 25 joints in ©, 35 or more in Ö, short and stout, with short, stout, apical spines. Gmathopod 1 spinose, 24 joint channelled in front, 3X notched at top of front margin, 5tk long, stout, free part with margins parallel, 6th much shorter, N ANETTE ut 4 526 Talitrus slightly tapering, finger short. Gnathopod 2, 24 joint membranaceous, narrowly oval, 34 longer than 4", 5th widest in proximal half of free part, then from an angle of the hind margin narrowing to apex, 6!" shorter than 5, front margin straight, apex narrowly rounded, produced beyond the minute, longitudinally placed finger. Peraeopod 1 considerably longer than peraeo- pods 2 or 3. Peraeopod 2, finger short, conspicuously notched. Peraeo- pod 3 short, stout. Peraeopods 4 and 5 rather elongate. Peraeopods 3—5, 24 joint narrowest above, front margin very convex, hind expansion strongly developed below, the joint much smaller than the side-plate in peraeopod 3, but much larger in peraeopods 4 and 5. Pleopods 1—3 slender, rami about as long as peduncle. Uropods 1 and 2, both rami spinose on margin and apex. Uropod 3, ramus subequal to peduncle, with spinules on margin and slender spine at apex. Telson broader than long, apically rounded, with a few spinules. Colour like sand or a deal board, or different shades of horn in section. L. Q 15, d 16—25 mm. North-Atlantie and adjoining seas (European coast, at least from the south of Norway to Naples; Azores). a gulliveri Miers 1876 T. g., Miers in: Ann. nat. Hist., ser. 4 v.17 p. 406 | 1879 T. g., Miers in: Phil. Tr., 0.168 p.495 | 1893 7.?g., A. Della Valle in: F. Fl. Neapel, v.20 p.511. Body slender, smooth. Head small, anterior margin straight. Pleon segments 2 and 3, postero-lateral angle somewhat prominent and acute, its hind margin straight. Eyes round, black. Antenna 1 about reaching end of penultimate joint of peduncle of antenna 2, 1° joint shorter than 24 or 34, flagellum as long as peduncle, with 4 joints, last minute. Antenna 2, not as long as body, much shorter and more slender than in T. saltator (p. 525), penultimate joint of peduncle more than half as long as ultimate, flagellum rather longer than peduncle, 18-jointed. Gnathopods 1 and 2 small and weak. Gnathopod 1, 5th, 6 and 7tk joints short, subequal, not dilated. Gnathopod 2, palm slightly dilated and the finger quite rudimentary as in T. saltator. Peraeopods 4 and 5 considerably longer than the preceding peraeopods, 24 joint moderately developed. Uropods 1 and 2, rami subequal. Uropod 3 quite rudimentary. L. about 10 mm. None of the specimens had largely developed BB ChoNEHEN gnathopod 2, but, if all were 2, that would leave the genus indefinite. Island of Rodriguez. Under stones in damp places. T. cloquetii (Aud.) 1826 Orchestia c., Audouin in: Deser. Fgypte, v.lıv p.9; Crust. t. 11 f.9 | 1862 O. c., O. cloquettii, Bate, Cat. Amphip. Brit. Mus., p.22 t.4 f.] (a very inaccurate copy) | 1893 O.? cloquetü, A. Della Valle in: F. Fi. Neapel, v. 20 p-509 | 1830 Talitrus e., H. Milne Edwards in: Ann. Sei. nat., v.20 p.864 | 1835 Thalitrus c., Guörin (-Möneville) in: Exp. Mor6e, Atlas p.3 Zool. t.27 f.4e | 1851 Talitrus e., Talitror- chestia, F. Brandt in: Bull. phys.-math. Ac. St.-Pötersb., v.9 p. 135, 137, 138. Savigny’s figure merely represents a misapprehension of T. saltator (p. 525) in regard to the gnathopod. Red Sea? (Egypt). T. fissispinosus (Kossm.) 1880 Orchestia fissispinosa, Kossmann, Reise Roth. Meer., v.21 Malacost. p. 129 t.13 £.1—5 | 1893 O.? f., A. Della Valle in: F. Fl. Neapel, v.20 p.509 | 1888 Talitrus fissispinosus, T. Stebbing in: Rep. Voy. Challenger, v.29 p.515. Probably young 2. L.5 mm. Red Sea. Men anumde du“ 400-2 im A de a Ba in Talitroides, Orchestoidea 527 2. Gen. Talitroides Bonnier 1898 Talitroides, (J. Bonnier in:) Willem in: Ann. Soe. ent. Belgique, v.42 p.208. Near to Talitrus (p. 524). Palp of maxilla 1 much reduced. Gnathopod 1 simple. Gnathopod 2 alike in both sexes. Pleopods 1 and 2 with inner ramus rudimentary, reduced to a simple tubercle. Pleopod 3 consisting of a small process representing the peduncle without rami. Eggs very few and comparatively large, contained in a marsupium formed by very short lamellae attached to the peraeopods 1—3. 1 species. 1. T. bonnieri Stebb.') * With the characters of the genus. Origin unknown (found in a conservatory at Ghent). 3. Gen. Orchestoidea Nic. 1849 Orchestoidea (Sp. un.: O. tuberculata), H. Nicolet in: Gay, Hist. Chile, ©. 3 p-229 | 1888 O., T. Stebbing in: Rep. Voy. Challenger, v.29 p.231 | 1891 O., T. Stebbing in: Ann. nat. Hist., ser.6 v.8 p.328 | 1898 O., Calman in: Ann. N. York Ae., v.11 p.265 | 1850 Talitronus, J. D. Dana in: Amer. J. Sci., ser.2 0.9 p.295 | 1852 7. (Sp. un.: T. insculptus), J.D. Dana in: P. Amer. Ac., v.2 p.202 | 1851 Megalorchestes, Megalorchestia. F. Brandt in: Bull, phys.-math. Ac. St.-Pötersb., v.9 p. 142, 310. Like Talitrus (p. 524), except that gnathopod 2 in JS is powerfully subchelate instead of feebly chelate. 5 species. Synopsis of species: N Body with teeth or tubereles — 2. Body smooth — 8, 2 EP 1. O. tuberculata . . p. 527 Body with dorsal teeth on pleen ....... 2. O. fischeri . . . p.528 3 | Eyes well separated — 4. N ER Ua ER 5. O. brasiliensis . . p.529 4 | Gnathopod 2 strongly subchelate; only & known 3. O. californiana. . p.528 Gnathopod 2 feebly chelate; only 2 known. . . 4. O. pugettensis . . p.529 1. O. tuberculata Nic. 1849 Talitrus chilensis (2) -+O.t., H. Nicolet in: Gay, Hist. Chile, v.3 p.229; p.231 Crust. t.2 f.4 | 1852 Talitrus ornatus (2) + Talitromus insculptus, J. D. Dana in: P. Amer. Ae., v.2 p.201; p.202 | 1853 & 55 Orchestia (Talitrus) insculpta + O. tuberculata, J. D. Dana in: U. S. expl. Exp., v.13u p.855 t.57 f. la—m (S), n—r (2); p.1595 | 1893 O.t., A. Della Valle in: F. Fl. Neapel, v.20 p. 496 t.57 f. 55. In JS peraeon segments, side-plates, 24 joint of peraeopods 3—5 and sometimes pleon segments 1—3 sculptured or marked with transverse ridges and series of tubereles; in © the sculpturing is almost evanescent, chiefly observable as a few faint sulcations or rugosities on side-plates and 24 joint of peraeopods 3—5. Side-plate 1 narrow, curved forward, 24—-5th broad, 5th deeidedly less deep than 4. Eyes subrotund, large. Antenna 1 very 2) Spec. nov. After Jules Bonnier. — Willem published Bonnier’s account and name of the genus, withgut describing or naming the species, for which the genus is ercated. 528 Örchestoidea small, not reaching end of penultimate joint of antenna 2; joints of pedunele successively shorter, flagellum 5—7-jointed. Antenna 2 in J longer than half the body, powerful, penultimate joint of pedunele long and stout, ultimate still longer, variable; flagellum shorter than peduncle, many-jointed. Antenna 2 in Q much smaller than in C, flagellum subequal to peduncle, 12—19-jointed. Gnathopod 1 in CS, 5tk joint mueh longer than 6", narrow- ing a little to distal end, 6t% linear, subeylindrical, without palm, finger small. Gnathopod 2 in J, 5tk joint very small, masked behind by 4fth, 6th massive, palm spinulose, rather oblique, nearly straight, with an excavation near the middle, corresponding with a slight projeetion in the margin of the long curved finger. Gnathopod 1 in O, 5t® joint narrowly oval, 6! narrowing to the palm-less apex, finger small. Gmatltopod 2 in Q feeble, 6 joint elliptical, the chela-forming finger longitudinal, nearly reaching apex of 6th joint. Peraeopod 1 decidediy longer than peraeopod 2, the latter with notched finger. Peraeopod 3 short, peraeopod 5 a little shorter than peraeopod 4, moderately stout. Uropods 1—3 very spinose; uropod 1, both rami armed with spines. Colour yellowish white, peduncle of antenna 2 orange. L: 18—20 mm. South-Paeifie (near Valparaiso). Burrowing in the sand; @ under sea-weed thrown up by the tides. 2. O. fischerii (M.-E.) ?1828 Orchestia f., H. Milne Edwards in: M&m. Soe. Hist. nat. Paris, «5 t.25 f. 14 | 1830 O. f., H. Milne Edwards in: Ann. Sei. nat., v.20 p. 861, 362 | 1840 O. f., H. Milne Edwards, Hist. nat. Crust., v.3 p.19 1.29 f.4 | 1893 O.f., A. Della Valle in: F. Fl. Neapel, v.20 p. 497 t.57 £.56 | 1862 Orchestoidea f., Bate, Cat. Amphip. Brit. Mus., p.11 t.2 £.1. Body stout, pleon segments 2 and 3 each with 3 large vertical dorsal teeth, placed near together, one on each side of the median line, the 34 being by implication central, segments 4 and 5 scabrous above. Eyes large, round. Antenna 1 very short, stout, tapering. Antenna 2 nearly as long as peraeon. Maxillipeds, 1° and 24 joints of palp expanded. Gmathopod 1 in G small, not cheliferous, and ending in a small very narrow hand. Gnathopod 2 in d, 6! joint powerful, with long oblique palm, having near the centre a prominent process, finger very large. Peraeopods 1—3 small. Peraeopod 4 very large, 24 joint greatly developed, raised behind above its point of attachment and overlapping much of peraeopod 5 and the pleon, the other joints long but of the ordinary form. Peraeopod 5 much shorter, 24 joint as broad as long. (According to Bate the eyes are small, ultimate joint of peduncle of antenna 2 thricee as long as the short penultimate, pleon segments 1—3 each with 2 dorsal teeth, but he does not say that he has examined a specimen.) L. about 13 mm. Morea, bay of Calamati (Petalidi [Greece]). 3. O. californiana (F. Brandt) 1851 Megalorchestes californianus (nom. nud.), Megalorchestia californiana, F. Brandt in: Bull. phys.-math. Ac. St.-Pötersb., v.9 p. 142, 3ll t. | 1898 Orchestoidea californiana, Calman in: Ann. N. York Ac., v.11 p.265 t.31 f.1 | 1853&55 Orchestia (Talitrus?) scabripes, J. D. Dana in: U. S. expl. Exp., v.1311 p. 860; t.57 f.4 | 1857 Megalorchestia s. + M. californiana, Stimpson in: Boston J. nat. Hist., ©. 6 p.516 | 1862 Orchestoidea s. + ©. c., Bate, Cat. Amphip. Brit. Mus., p.11t.1 f.3; p.14 | 1877 Megalorchestia franciscana, Lockington in: P. Calif. Ac., ©.7 p. 47 | 1893 Orchestia gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.500, 508. Not improbably the d of O. pugettensis. Body smooth. Side-plates rather large, 5tk hardly shorter than 4! (Dana; in Brandt’s figure RREHHER — f | 1 | : | 2 ’ Orchestoidea 529 side-plate 5 is extremely wide (from front to back), whereas the basal joint of peraeopod 3, which is said to be extremely dilated, is in the figure not half as wide as the side-plate). Eyes large, a little reniform (Dana); of moderate size, suboval, slightly narrowed above, wide apart, black (Brandt). Antenna 1 about reaching middle of penultimate joint of peduncle of antenna 2, flagellum shorter than peduncle, 7- or 8-jointed. Antenna 2 much longer than body; ultimate joint of peduncle sometimes more than twice as long as penultimate, flagellum longerthan pedunele, 35—37 (Dana: 20—22)-jointed. Gnathopod 1, joints scabrous (Lockington), 5% with narrow triangular sub- apical process of hind margin, 6% much shorter than 5tk, narrow, without palm, finger short. Gnathopod 2, 5tk joint small, masked by 4h; 6th Jarge, suboval; palm scabrous, moderately oblique (Lockington: almost transverse), the centre of it forming a low oblong tooth or process; finger long and much eurved, its apex touching the usual groove in the hand. Peraeopods 4 and 5 subequal, longer than the rest. Peraeopods 3—5, 24 joint well expanded; surface of peraeopods scattered over with minute spinules (not mentioned by Brandt). Uropod 1, outer ramus without marginal spines (Dana), equally spinulose with the inner one (Stimpson). Telson simple, cordiform, dorsally longitudinally impressed. L. 22—29 mm. North-Paeifie (North California), Among detritus at high-tide level. 4. O. pugettensis (Dana) 1853 & 55 Orchestia (Talitrus) p-, J. D. Dana in: U. S. expl. Exp., v.13m p.859; t.57 f.3a—d | 1857 O. p., Stimpson in: Boston J. nat. Hist., v.6 p.516 | 1862 Orchestoidea p., Bate, Cat. Amphip. Brit. Mus., p.83 t.2 f.3 | 1893 Orchestia gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.499. Probably the 9 of O. ealiforniana (p. 528). Back broad. Head almost completely truncate in front. Side-plates 2—4 square, much larger than 1st, 5th broad, front lobe about as deep as preceding side-plates, 6!" strongly produced backward, lower margin ridged. Pleon segment 3, postero-lateral corners rather sharply quadrate. Eyes rudely subrotund, as far apart as their longest diameter. Antenna 1 very short, flagellum shorter than peduncle. Antenna 2, ultimate joint of peduncle nearly twice as long as penultimate, flagellum rather longer than peduncle, of 30 joints, broader than long, with short setules. Gmnathopod 1 spinose, 24 joint slightly eurved, channelled in front, 5tk Jong, widening to a subapical pellueid process, 6!" much shorter and narrower than 5t%, but moderately long, slightly curved, without palm but with a slight longitudinal pellucid swelling of hind margin, finger straight. Gnathopod 2, 24 joint very large, a long and broad oval, the membranous expansion fringed with spinules, 4% joint having at hinder apex a little triangular (seemingly 2-jointed, Dana) process, 5% a little longer than 6tk, with membranous bulging of free part, finger small, longitudinal, not reaching produced apex of 6tk joint; branchial vesicles small; marsupial plates short, narrow, with a few apical setae. Peraeopods 1 and-2, marsupial plates long, narrow, fringed with long setae. Peraeopod 2, finger abruptly narrowed midway. Peraeopods 3—5, 24 joint broadly expanded. Peraeopods 4 and 5 long, not specially expanded below 24 joint. Uropod 1 long, peduncle and both rami very spinose (Dana: outer ramus naked). Uropod 3, ramus narrow, longer than peduncle. Telson about as long as broad. L. 16 mm. North-Paeifie (North California). 5. O. brasiliensis (Dana) 1853 & 55 Orchestia (Talitrus) b., J. D. Dana in: U. S. expl. Exp., v.13n p.857; t.57 f.2a—h | 1862 Orchestoidea b., Bate, Cat. Amphip. Brit. Mus., p.13 t.2 f.4 | 1893 Orchestia gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 499. Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 34 530 Orchestoidea, Orchestia Body smooth. Side-plate 5 much shallower than 4! Pleon segment 3, postero-lateral corners quadrate. Eyes rather large, approximate in front. Antenna 1 very short, flagellum 3-jointed. Antenna 2 in Q not half as long as body, flagellum scarcely as long as pedunele, about 16-jointed. Gnathoped 1 in d as in ©. Gmathopod 2 in JS, 6% joint large, subovate, palm slightly convex, spinulose, very oblique, defined- by a well marked angle but not toothed, finger elongate. Gnathopod 1 in © longer than gnathopod 2, finger thick, ceurved, not much shorter than -the palmless 6! joint, which in figure appears longer than 5, Gmathopod 2 in Q, 5th joint with very bulging hind margin, 6tt with straight front and bulging hind margin, distally narrowly produced much beyond the minute longitudinal finger. Peraeopods 4 and 5 much longer than the preceding peraeopods, 24 joint broadly expanded, the rest slender, spinules numerous. Uropod 1 rather long. Uropod 3 short, ramus as long as peduncle L. 12 mm. Rio Janeiro harbour. 4. Gen. Orchestia Leach 1793 [Subgen.] Gammarellus (part.), J. F. W. Herbst, Naturg. Krabben Krebse, v.2 p. 106 | 1802 Talitrus (part.), (Latreille in:) Bose, Crust., v.1 p.78 | 1802 T. (part.), Latreille, Hist. Crust. Ins., v. 3 p.38 | 1813/14 Orchestia (Sp. un.: O. littorea), Leach in: Edinb. Ene., v.7 p.402 | 1888 O., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 602, 1678 | 1890 O,, G. O. Sars, Crust. Norway, v.1 p. 24 | 1893 O., A. Della Valle in: F. Fl. Neapel, v.20 p.494 | 1847 Scamballa (part.), (Leach in MS.) A. White, Crüst. Brit. Mus., p. 86 ! 1876 Orchestes (non Illiger 1798, Coleoptera!), R.T. Maitland in: Tijdschr. Nederl. dierk. Ver., v.2 p.11. Like Talitrus (p. 524) except that gnathopod 1 (Fig. 93) % in J and in © is less strongly developed and is subchelate or instead of simple, while gnathopod 2 in S is powerfully AN subchelate instead of feebly chelate. Antenna 2 in J perhaps never attains so strong a development as is met with in Da Talitrus and Talorchestia (p. 543); the maxillipeds seem Fig. 98. sometimes to have an obscure rudiment of the 4h joint of O. selkirki, 2. the palp, and the front lobe of side-plate 5 may be as deep Gnathopod 1. 25 side-plate 4. The notching of the finger in peraeopod 2 is seldom so sharp and decided as in Talorchestia. Generally distributed in temperate and tropical seas between tidemarks among sea-weed and stones, as distinguished from the sand-dwelling Talitrus and Talorchestia, also found inland at various heights up to 1375 m above sea-level. 23 accepted and 6 doubtful species. Synopsis of accepted species: *) inerassated — 2. Peraeopod 5in adult 3, 4th and öth joints not strongly Peraeopod 5 in adult 3, 4th and 5th joints strongly | inerassated — 6. Gnathopod 2 in 3, palm extremely oblique. ... 1. O. mediterranea. p.531 Gnathopod 2in d, palm not extremely oblique — 8, *) Since this table is based upon structures of, the species 22 and 23, of which 5 speeimens are unknown, are omitted; they differ by the palm of gnathopod 1: feebly developed in 22, OÖ. parvispinosa p. 541, well developed in 23, O. montana p. 542. Orchestia Gnathopod 2in d, finger without astrong tooth — 4. r Gnathopod 2 in d, finger with a strong tooth — 5. Peraeopod 5 in adult S, 5th joint as broad as long, H> Peraeopod 5 in adult 3, 5th joint longer than broad, ae RN N er 8. Gnathopod 2 in d, tooth of finger central ; Gnathopod 2 ind, tooth of finger close to hinge b21 Op Gnathopod 1 in 3, 4th joint with apical process — 7. Gnathopod 1 in d, 4th joint without apical process — 8. Gnathopod 2 in d, palm with two excavations Gnathopod 2 in d, palm smoothly convex 6 -1 Body segments acquiring transverse dorsalridges — 9. Body segments not acquiring dorsal ridges — 10. je) 9 Peraeopod 5, 2d joint regularly expanded —- 11. | Gnathopod 2 in 8, palm not deeply concave — 12. Gnathopod 2 in d, palm with strong tooth near finger-hinge — 13. Gnathopod 2 in 3, palm without tooth near finger- hinge — 14. 12 13 14 ? Gnathopod 2 ind, 6th joint not narrowing to the palm — 15. Gmnathopod 1 in Sg, 5th joint much longer than 6th — 16. Gnathopod 1 in d, 5th joint not much longer than 6th — 17. 15 16 Gnathopod 2 in d, palm very oblique — 18. Gnathopod 2 in 3, palm not very oblique — 19. Gnathopod 1 in d, finger covering whole apex of - 17 „ Gnathopod lin, Siner not covering whole apex ER - 18. Antenna 2 slender, flagellum eylindrie . . . . . 19. 19 Antenna 2 stout, flagellum flattened — 20. Gnathopod 1 ing, 6th joint without prominent | Gnathopod 1 in d, 6th joint with prominent process 20, DEOBOBE in. le Rn re BE 21. ee er 2.0 m Gnathopod 2 in S, palm slightly oblique. ... . 8. Gnathopod 2 in d, palm very oblique ..... 9. Peraeopod 5, 2d joint scarcely expanded . . . 10. Gnathopod 2 in d, palm deeply concave .... 11. Gnathopod 2 in d, palm with one strong tooth . 12. Gnathopod 2 in d, palm with two teeth . . . . 13. Gnathopod 2 in 3, 6th joint narrowing to the palm 14. Side-pate 5 deep. . . . . a Side-plate 5 not dep . :. 2. 2:0.» ee ı } N 17. 551 .gammarellus . p. 532 O. chevreuxi . . p.533 . O. montagui p. 533 . O. tucurauna . . p.534 O. bottae. . . . p.534 O. traskiana p. 534 O. serrulata p- 585 O. guernei p- 536 O. marmorata p. 586 O. capensis. . . p.537 ©. chiliensis . P.587 O. dentata » pP. 537 O. selkirki . . . p.538 O. pickeringii. . p.538 O.nitida . . . .„. p.539 O.humicola. . . p.539 O. floresiana . p.539 O. grillus. . . . p.540 O. platensis . p.540 O. sulensoni . p. 541 1. ©. mediterranea A. Costa 1857 O.m., A. Costa in: Mem. Ace. Napoli, v.l p.181 | 1866 O.m., Cam. Heller in: Denk. Ak. Wien, &0.26u p.4 t.1 f.7 | 1881 O. m., Nebeski in: Arb. Inst. Wien, v.3 p.143 | 1895 O. m., Chevreux in: Rev. biol. Nord France, v.7 p.158 | 1899 O. m., T. Scott in: Rep. Fish. Board Seotl., v.17 p. 264 t.13 £.9—11 | 1857 O.laevis, Bate in: Ann. nat. Hist., ser.2 v.19 p.136 | 1862 O. trigonocheirus, Bate, Cat. Amphip. Brit. Mus., p.26 t.4 f.6 | 1893 O. chilensis (part.), O. spinimana, A. Della Valle in: F, Fl. Neapel, v.20 p.498 t.2 £.8; t.15 f.31—38; p. 129, 248, 941. 34* L-— Pr nn BE :..; Be Bl: 532 Orchestia Body rather compressed. Side-plate 1 much smaller than 24, 5th nearly as deep as 4", Pleon segment 3, postero-lateral corners quadrate. Eyes subrotund or transversely oval, dark, usually nearer together than their width. Antenna 1 reaching end of penultimate joint of pedunele of antenna 2, joints of peduncle subequal in length, flagellum shorter than pedunele, 6- or 7-jointed. Antenna 2 '/, as long as body or less, penultimate joint of pedunele °/, as long as ultimate, flagellum subequal to peduncle, 20-jointed. Gmathopod 1 in JS, 5tk joint with the subapical pellucid process scabrous, broadly rounded, 6! much shorter, hind margin sinuous, distal pellueid process scabrous, point of finger not reaching its extremity, though extending beyond the genuine palm-margin. Gnathopod 2 in d, 4 and 5th joints very small, 6% very large, piriform, narrow at the finger-hinge, near to which the long, extremely oblique, sinuous, spinulose palm at least usually forms a small tooth, finger very long and sinuous, its apex over- lapping the palm at commencement of short hind margin, although the palm itself ends with the short ehannelling adapted to receive the finger-point. Gmathopod 1 in Q, 5! joint without pellucid process, 6! shorter than 5th, spinose, oblong, with a small pellucid widening at apex of hind margin, which is considerably overlapped by the rather stout, acute finger. Gnathopod 2 in Q, 24 joint expanded, laminar, narrowing distally, 4" joint with a distinet, though not much produced, rounded process at apex of hind margin, 5th produced along much of free part of hind margin, process longitudinally truncate, 6!" widening to a broadly rounded process which does not extend far beyond the palm proper and apex of finger. Peraeopod 3, 24 joint broadly oval, 4 and 5t" rather stout. Peraeopod 4, 24, 4th and 5th joints much longer, 24 oblong oval. Peraeopod 5, 24 joint much wider than in peraeopod 4, hind margin with lower corner broadly rounded, 4! joint in J triangular, distally much widened, with apex of hind margin truncate, 5tR joint in CS not longer than broad, immediately from narrow point of attachment widened on both sides beyond the broad distal end of 4% joint, then narrowing to apex which is still much wider than the linear 6t% joint; in O 4 and 5tk joints not at all wider than those of peraeopod 4. Uropod 1, rami considerably shorter than peduncle. Uropod 2, rami subequal to peduncle, outer ramus shorter than inner. Uropod 3, ramus’rather shorter than the stout pedunele. Telson triangular, fringed with spinules. Colour greenish brown. L. 15 mm. Mediterranean; North-Atlantic (France, England, Wales, Ireland). Sometimes considerably beyond high-water mark. 2. O. gammarellus (Pall.) 1766 Oniscus g., Pallas, Mise. zool., p.191 t.14 f.25 | 1791 Gammarus g., A. G. Olivier in: Ene. möth., v.6 p.187 | 1793 Cancer g., J. F.W. Herbst, Naturg. Krabben Krebse, v.2 p. 129 t. 36 f.2, 3 | 1802 & 03 Oniscus g., Talitrus (part.), Latreille, Hist. Crust. Ins., v.3 p.39; ©.6 p.300 t.56 f.5, 6 | 1872 Örchestia g., A. Boeck, Skand. Arkt. Amphip., v.1 p.102 | 1888 O.g., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1714 | 1893 O. g. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.499 t.2 f.11; t.15 f.1—12, 39—43 | 1808 Cancer (Gammarus) littoreus, Montagu in: Tr. Linn. Soc. London, v.9 p.96 t.4 f.4 | 1812 Astacus l., Pennant, Brit. Zool., ed.5 v©.4 p.82 | 1813/14 Orchestia littorea, Leach in: Edinb. Ene., %.7 p.402 t. 221 f.6 | 1890 O.1., G.O. Sars, Crust. Norway, v.1 p.24 t.10 | 1876 Orchestes I., R.T. Maitland in: Tijdschr. Nederl. dierk. Ver., v.2 p. 11 | 1840 Orchestia littoralis, H. Lucas in: Hist. An. artie., Crust. Arach. Myr., p.225 | 18480. euchore, Friedr. Müller in: Arch. Naturg., v.141 p.58 t.4 | ?1852 O. dispar, J.D. Dana in: P. Amer. Ac., v.2 p.204 | ?1853 & 55 O.d., J.D. Dana in: U.S. expl. Exp., v.13n p.878; t.59 £.6a—m | 1868 O. brevidigitata, Bate & Westwood, Brit. sess. Crust., v.2 p.497 f. | 1886 O. chilensis (err., non O,. chiliensis . Milne Edwards 1840!), G. M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p. 145. z u x } E Di u N ec! Orchestia s 533 Body rather compressed. Side-plate 1 small, 24—4th quadrate, the small process of hind margin distinet, 5!" broad, in front nearly as deep as 4th, Pleon segment 3, postero-lateral corners quadrate. Eyes irregularly rounded, black, less than the diameter apart. Antenna 1 seldom reaching beyond penultimate joint of peduncle of antenna 2, 1° joint shorter than 24 or 34, flagellum 6—8-jointed. Antenna 2 about '/, as long as body, ultimate joint of peduncle sometimes considerably longer than penultimate, flagellum about 20-jointed. Gnathopod 1 in C', 6% joint shorter than 5th, both distally widened, 6! usually resting on produced part of 5th, finger matching transverse palm, but not covering the produced part of 6 joint. Gnathopod 2 in J, 24 joint channelled in front, not lobed, 5tt very small, 6th Jarge, widening to the palm, which is almost transversely arcuate between a depression adjoining finger-hinge and an obtuse defining projecetion. Gnatho-: pod 1 in O, 5!" joint distally widened, 6!" narrowly oblong, the short trans- verse palm overlapped by finger. Gnathopod 2 in ©, 24 joint membranaceous, broader above than below, 5!" with free hinder part bulging, 6" produced, but not very greatly. beyond the small, rather obliquely placed finger; marsupial plates rather narrow, long, fringed with long setae. Peraeopod 2 shörter than peraeopod 1, finger with sinuous inner margin. Peraeopods 3—5 successively longer, 24 joint well expanded. Peraeopod 5 in 9, 4 joint greatly widening distally, 5" greatly expanded, widest near base, both these joints having flattened edges before and behind, and in adolescent CS showing numerous gradations to the linear form found in © and young; 6th joint straight. Uropod 1 rather long, rami shorter than peduncle, both with lateral spines. Uropod 3, ramus much shorter than peduncle. . Telson soft, thick, about as broad as long, apex ae emarginate. Colour 9 brownish, © greenish. L. about 17 mm. North-Atlantie with adjoining seas (Europe, from the Baltie'to the Black Sea; Algiers; Madeira; Azores); ?South-Pacific (lllawarra [New South Wales], sea alkansel. 3. O. chevreuxi Guerne 1887 O.c. (2), Guerne in: Naturaliste, v.9 (p.6) | 1888 O.c. (2), Guerne in: Bull. Soe. zool. France, v.13 p.59 f.1, 3,5, 7 | 1888 ©. c. (S), Chevreux in: Bull. Soc. zool. France, v.13 p.92 f.1,3,5 | 1888 O. littorea (part.)?, T. Barrois in: Bull. Soc. zool. France, v.13 p.19 | 1893 O. gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.499. Distinguished from O0. gammarellus in SC by: peduncle of antenna 2 longer and more robust, flagellum also more elongate (the 18—20 joints being mostly longer than broad), gnathopod 2, 6 joint more broadly oval, palm much more convex, with deep groove adjoining the defining angle, finger shorter and more robust, peraeopod 5 more elongate, with 4! and 5tk joints robust but much longer than wide, 6!" joint long, eurved; in © by: antennae 1 and 2 longer, gnathopod 2, 24 joint much less widened, 4'h joint carıying 2 spines on apex, 5th and 6fh joints more elongate, peraeopod 5 longer, with very long, slightly curved 6! joint, uropods 1 and 2 longer, uropod 3 with much stronger spines on peduncle, telson with stronger spinules, and its narrower apex much more sharply emarginate. Colour violet, almost rose, deeper above. L. about 15 mm. Azores (Fayal, in the caldiera or erater); Teneriffe (in the forest of Las Mercedes, under detritus on the banks of streamlets, not less than 500 m above sea-level). 4. O.montagui Aud. 1826 O. m., Audouin in: Deser. Egypte, v.1ıv p.93 Crust. t.11 £.7 | 1866 O. m., Cam. Heller in: Denk. Ak. Wien, v.26ı7°p.2 t.1 f.3,4 | 1866 O. m., E. Grube in: Arch. Naturg., v.321 p.380 t.9 f.1,2 | 1868 O. m., Czerniavski in: - 534 Orchestia Syezda Russ. Est., Syezda 1 Zool. p.118 t.8 f.34—39 | 1893 O. m., Chevreux in: Bull. Soe. zool. France, v.18 p.128 f.2 ! 1895 O.m., Chevreux in: Rev. biol. Nord France, v.7 p.158 | 1837 O. littorea (err., non Leach 1813/14!), H. Rathke in: Mem. pres Ac. St.-Pötersb., v3 p.371 t.5 f.1—6 | 1862 O. I. (part.), Bate, Cat. Amphip. Brit. Mus., p- 27 | 1893 O. gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 499. Extremely variable, by gradual transitions completely united with. O. bottae (Czerniavski); still nearer to O. gammarellus (p. 532) by the expanded 4th and 5th joints in peraeopod 5 of adult d. Finger of gnatho- pod 2 in d powerfully arched at the hinge, with a projeetion in middle of inner margin, which becomes very prominently developed, forming a blunt tooth; in Savigny’s figure (in: Deser. Egypte) the 6% joint has the palm defined by an obvious tooth, which other authors do not represent. L. 15 mm (Rathke). Mediterranean and Black Sea. 5. O.tucurauna Fr. Müll. 1864 O.t., O. tucuratinga, Fritz Müller, Für Darwin, p-54 f.50, 51 | 1893 O. gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 499, 510. S (young, but mature). Antenna 2 slender, joints of flagellum distinct; gnathopod 2 with palm uniformly convex, peraeopod 5 slender and like peraeopod 4; subsequently 2, 3 or 4 proximal joints of flagellum of antenna 2 are fused together, gnathopod 2 acquires a deep emargination in palm elose to the finger-hinge and a process of the finger fitting this eavity, while the 4th and 5th joints of peraeopod 5 are swelled to a considerable incrassation. The figure of gnathopod 2 in G shows a very broad 6!" joint, with spinulose palm, slightly oblique, not defined by any tooth. The figure of gnathopod 2 in © shows a well expanded 24 joint, 5% bulging, not much longer than 6'h, which is broadly rounded at apex and little produced beyond the minute longitudinal finger. L.? Brazil? 6. ©. bottae M.-E. 1840 O. b., H. Milne Edwards, Hist. nat. Crust., ©.3 p-17 | 1851 O.b., F. Brandt in: Bull. phys.-math. Ace. St.-Pötersb., v.9 p.141 | 1868 O.b. + ?0O.b. var. feminaeformis (juv.), Üzerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.117 t.8 f.28, (297), 30—82 | 1865 O. cavimana, Cam. Heller in: Verh. Ges. Wien, v.15 p.979 t.17 | 1879 O.c., Hoek in: Tijdschr. Nederl. dierk. Ver, v.4 p.131 t.9 f.8—10 | 1881 O. c., Nebeski in: Arb. Inst. Wien, v.3 p.142 t.2 £.10 ete.; t.3 f.21 ete. | 1895 O. bottae + O. c., Chevreux in: Rev. biol. Nord France, v.7 p.156 f.1—4; p. 158. Closely related to O. grillus (p. 540). Eyes roundish. Antenna 1, joints of pedunele successively longer, flagellum 6-jointed. Antenna 2 less than '/, as long as body, flagellum 14—22-jointed. Gnathopod 1 in JG, 5th and 6tk joints strongly produced at hinder apex; also the 4" joint has at least sometimes a small prominence at hinder apex; finger overlapping palm, but not reaching end of apical process. Gnathopod 2 in J, 6% joint large, broadly suboval, palm oblique, divided into 3 protuberances, the broadest central, separated (in adults) by a deep excavation from that next finger- hinge, and a shallow one from the small defining tubercle; finger long, with margin bulging at a point corresponding to excavation in palm. Peraeopod 5, 4 and 5tk joints not specially widened at any stage. Colour very dark, almost black (Heller). L. 12—21 mm. Black Sea; Palestine; Cyprus (Mt. Olympus, 1255 m above sea-level); Holland (in garden remote from sea); France. 7. O. traskiana Stimps. 1857 O.t., Stimpson in: P. Calif. Aec., v.1 p.90 | 1857 O.t., Stimpson in: Boston J. nat. Hist., ©.6 p.517 | 1862 O.t., Bate, Cat. Amphip. Brit. Mus., p.19 t.3 £.4 | 1893 O.t., A. Della Valle in: F. Fl. Neapel, v.20 p. 510. 1 Orchestia 535 Side-plates 2—4 quadrate, much larger and deeper than 1% or 5th, ‚Eyes squarely rounded, black, less than the diameter apart. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2, flagellum shorter than peduncle, 5-jointed. Antenna 2, about '/, as long as body or a little more, ultimate joint of peduncle not much longer than penultimate, flagellum subequal to pedunele, 16-jointed in S, 12-jointed in 9. Gnathopod 1 in S, 5th joint not very much longer than 6tk, 4th, 5th and 6th joints pro- duced behind into pellueid bosses, successively larger, narrow on joints 4 ' and 5, broad on joint 6, which has a transverse palm, finger small, only reaching end of true palm, not overlapping the boss. Gnathopod 2 in J, 24 joint with front margin very slightly convex, not lobed, 34 joint lobed, 5th very small, 6tk large, ovate, widening slightly to the oblique, convex, spinulose palm, which ends in a slight notch at the defining angle, finger large, curved. Gnathopod 1 in oO, 4 and 5th joints not produced into processes, 5t subapically widened, 6% narrowly oblong, with a scarcely perceptible scabrous pellucid apical widening, which as well as the little transverse palm is overlapped by the finger. Gnathopod 2 in ©, expansion of 24 joint wider above than below, 4 joint squared at distal hind corner, 5th with very convex free part of hind margin, 6" not much shorter, well produced beyond the small longitudinal finger. The young from the marsupium have gnathopods 1 and 2 almost exactly as in the mother. Peraeopod 2, finger with sinuous inner margin. Peraeopods 3—5, 24 joint broadly oval, successively larger, hind margin spinulose, 4tk joint moderately wide. Uropods 1 and 2 not very spinose, rami not much shorter than peduncle, both rami with marginal spines. Uropod 3, ramus slender, nearly as long as peduncle. Telson spinulose about apex. Colour light grey, sometimes greenish or brownish, always very pale. L. 0 15 mm, O smaller. North-Paeifie (San Franeisco). Among the rejectamenta along high-water mark. 8. O. serrulata Dana 1852 O.s., J. D. Dana in: P. Amer. Ac., v.2 p.204 | 1853 & 55 O.s., J.D. Dana in: U.S. expl. Exp., v. 1311 p. 870; t.58 f.7a—l (5), m—o (2°) | 1893 O.s., A. Della Valle in: F. Fl. Neapel, 0.20 p.498 t.57 £.61, 62 | 1862 O. aucklandiae + 0. s., Bate, Cat. Amphip. Brit. Mus., p.17 t.1a £.3; p.31 t.5 £.4 | 1886 O.a., G. M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.145 | 1893 O.a,, A. Della Valle in: F. Fl. Neapel, v.20 p.505 t.57 f£.65 | 1885 O. ornata, Filhol in: Reeu. Passage Venus, v.311 Zool. p. 468 t.53 f.2. In S peraeon segment 1 encircled by a raised ridge or corrugation, segments 2—7 (Thomson & Chilton: 2—5) similarly corrugated, except that the front ridge is withdrawn from the front of the segment, and sometimes a little broken; this character (not mentioned by Dana and Bate) is wanting in © or barely indieated. Side-plate 1 small, front margin straight, the others or at least 24—5t in J with eneireling idge, 24-4! having a conspicuous ridge down the centre. Pleon segment 3, postero-lateral corners quadrate, in Q with a minutely produced point. Eyes subrotund, dark, in both sexes wider apart than their diameter. Antenna 1 in J reaching half-way along penultimate joint of pedunele of antenna 2, in O to the end of it; 3 joints of peduncle subequal, flagellum 6- or 7-jointed. Antenna 2 smooth, much larger in C than in O, pedunele angular in section, ultimate joint not greatly longer than penultimate, both long in JS; flagellum 17- or 18-jointed, shorter than peduncle in d, longer in 9. Gmathopod 1 in GC, 5th joint strongly produced into subapical tuberele, 6% shorter, but with apical process broadly produced, so that the finger does not reach the end 536 Orchestia of it. Gmathopod 2 in J, 6th joint massive, widening to the palm, which is spinulose, slightly oblique, in shape variable, sometimes deeply excavate near finger-hinge, then running with straight slope to an acute defining tooth, sometimes more gently sinuous between hinge and tooth (in Dana’s figure ending in a broad excavation with untoothed defining angle); finger long to match the palm, its point passing the tooth. Gnathopod 1 in 9, 6" joint shorter than 5%, spinose, slightly narrower at apex than base, but still affording a small palm to the overlapping finger. Gmnathopod 2 in ©, 24 joint evenly and nowhere widely expanded, 34 rather long, 5!" not much longer than 6, 6 roundly produced a little way beyond the finger. Peraeopods 3 and 4, 24 joint oval. Peraeopod 5, 24 joint notably serrulate on hind margin, which, instead of being rounded below as in peraeopods 3 and 4, is squared or angularly produced. In peraeopods 4 and 5, the 4th and 5th joints are moderately stout, somewhat angular in section. Uropods 1—3, all the rami with marginal spines, in uropod 1 rami shorter than peduncle, in uropods 2 and 3 subequal to it. Telson with the usual little apical notch, and a few spinules. L. S sometimes exceeding 25 mm, O very much smaller. South-Paeifie (New Zealand). Among sea-weed and under stones between tide-marks. 9. O. guernei ÜUhevreux 1889 O.g., Falorcheskiat, Chevreux in: Bull. Soe. zool. France. v.14 p.332 f. © unknown. — d. Body tumid, all segments dorsally elevated, peraeon segments 6 and 7 and pleon segment 1 each with 2 transverse dorsal ridges. Side-plates not very deep. Pleon segment 3, postero-lateral corners simply quadrate (in figure). Eyes ovate. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2. Antenna 2 half as long as body, ultimate joint of pedunele much longer than penultimate, flagellum 18-jointed. Gnathopod 1 rather robust, 5tk and 6* joints strongly produced apically. Gnathopod 2, 6! joint large, very broad, palm much longer than the very short hind margin, finger robust, strongly curved, matching the long palm. Peraeopod 4 very strong, 4! and 5th joints much longer than broad. Peraeopod 5 not known. Uropods 1—3 and telson nearly as in O. gammarellus (p. 532). L. 9 mm. Bay of Horta [Azores (Fayal)]. In the sand. 10. O. marmorata (Hasw.) 1880 Talorchestia? m., Haswell in: P. Linn. Soe. N.S. Wales, v.5 p.99 t.5 f.3 | 1893 T. m., Orchestia chilensis (part.)?, A. Della Valle in: F. Fl. Neapel, 0.20 p. 512. > unknown. — GC. Side-plates with spinuliferous lower margin, 1° very small, sometines quite concealed by 24, . Eyes irregularly oval, wider than diameter apart, dark in spirit. Antenna 1 slender, flagellum 5-jointed. Antenna 2 more than thrice as long as antenna 1, about ’'/, as long as body, peduncle stout, flagellum as long as peduncle, flattened, with 17 joints, which are short and most of them broad. Gmnathopod 1, 5tk joint subequal to 6!%, distally produced into a narrow, rounded process, 6% much widened distally, palm transverse, finger well developed, overlapping the true palm but not the broad pellueid process of hind margin of 6% joint. Gnathopod 2, 6 joint large, oval, palm oblique, defined by a minute acute tooth. Peraeopods very thick, spinose, finger of peraeopod 2 with irregular inner margin, 24 joint of peraeopod 5 not dilated behind except at the top. Uropod 3 small, Orchestia 537 . ramus shorter than peduncle. Telson spinulose, with slightly notched apex. The whole of the Ban very hard. Colour, marbled red and white. L. 16 mm. Tasmania. 11. O. capensis Dana 1853 & 55 O. c., J. D. Dana in:-U.S. expl. Exp., v.13ı p-866; t.58 f.3a,b | 1862 O.c., Bate, Cat. Amphip. Brit. Mus., p.23 t.4 f.2 | 1893 O. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 506 t.57 £. 69. . 9 unknown. — d. Side-plates 2—6 very large, 5{% nearly as deep as 4th, Eyes subrotund. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2, flagellum 7—10-jointed. Antenna 2 rather more than half as long as body, ultimate joint of peduncle twice as long as penultimate or more, flagellum rather longer than peduncle, 14—16-jointed, setules minute. Gnathopod 1, 5tk joint without apical process (Bate), 6!" narrow, scarcely widened at apex, which is excavato-truncate, finger hardly longer than apex (Dana) (Bate: longer than apex). Gmathopod 2, 6! joint large, robust, widening to the palm, which is deeply, almost semieircularly excavate between a small tooth adjoining finger-hinge and the acute defining tooth. Peraeopods 1—5 all robust, with groups of spines rather crowded, 24 joint in peraeopods 3—5 broadly expanded; peraeopods 4 and 5 longer than the - rest, but not elongate. L. 16—18 mm. Cape of Good Hope. 12. O. chiliensis M.-E. 1840 O.c., H. Milne Edwards, Hist. nat. Crust., v.3 p-18 | 1888 0. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p.185 | 1898 O.c., G M. Thomson in: Tr. N. Zealand Inst., ©.31 p.199 | 1849 O. chilensis, Nicolet in: Gay, Hist. Chile, v.3 p. 235 | 1853 & 55 O. c.?, J. D. Dana in: U.S. expl. Exp., v. 1311 p.867; t.58 f.4 | 1862 O.c., Bate, Cat. Amphip. Brit. Mus., p.30 t.1a f.8 | 1893 O.c. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 498. In general like O. mediterranea (p. 531). Antenna 1, 24 and 34 joints of peduncle each longer than 1°, flagellum shorter than peduncle, 6- or 7-jointed. Antenna 2, ultimate and penultimate joints of peduncle very stout, and the latter little shorter than the former; flagellum shorter than pedunele, 17-jointed. Gnathopod 2 in 9, 6! joint very large, the palm having a large obtuse tooth near finger-hinge, and thence running rather sinuously and obliquely but not extremely so to meet the hind margin which is longer and better defined tban in O. mediterranea; finger long, rather sinuous. Peraeopod 5, 24 joint tending to quadrate at lower hind corner, 4% and 5th joints stout, but little more so than in peraeopod 4, both much longer than broad. Uropods 1 and 2, rami shorter than peduncle. Uropod 3, ramus much shorter than peduncle. L. 16—18 mm. Pacifie (Chili; New Zealand). Under stones and in little pools between tide-marks. 13. O. dentata Filh. 1885 O.d., Filhol in: Recu. Passage Venus, v.311 Zool. p: 462 t.53 £.1 | 1898 O, telluris?, G.M. Thomson in: Tr. N. Zealand Inst., v.31 p. 200. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2. Antenna 2 rather more than half as long as body, penultimate joint of peduncle inflated in the middle, flagellum less than half as long as pedunele. Gnathopod 1, 5t% joint distally widened, the lateral faces ecompressed, 6! joint more reduced than 5th, Gnathopod 2, 6! joint robust, almost globular, palm with a tolerably strong tooth at centre and a small one near the point‘ 538 Orchestia to which the finger tip is applied; finger with prominence which closes down immediately behind central tooth of palm. Peraeopods 1—3 successively larger, peraeopod 5 a little longer than peraeopod 4. L. 13 mm. Cook Strait (Isle of Kapiti). 14. O. selkirki Stebb. 1888 O.s., T. Stebbing in: Rep. Voy. Challenger, v. 29 p- 603 t.1,2 | 1893 O. gammarellus (part.), A. Della Valle in: F. Fl. Neapei, v.20 p.499. In general closely resembling O. gammarellus (p. 532). Antenna 1 in J, flagellum 8- or 9-jointed, in © 6-jointed. Antenna 2 in JG, flagellum reaching 28 joints. Maxillipeds, atuberele representing 4* joint ofpalp. Gnathopod1inO, see Fig. 93 (p. 530). Gmnathopod 2 in d, 6! joint very large, widest near base, narrowing slightly to the very sinuous, spiniferous palm, the strong finger having inner margin divided into 2 concave spaces, the first elosing over the little concavity and great convexity of the palm, the second leaving a narrow space between itself and the remainder of the palm, which ends in a groove for receiving the finger tip. Gmathopod 2 in Q, 24 joint not greatly widened, narrowing downward, 6 joint broadly produced beyond the minute, obliquely placed finger. Peraeopod 5, 4 and 5th joints in both sexes long and narrow. Uropod 3, ramus about as long as peduncle. Telson as broad as long, spinulose, the narrow apex a little emarginate. L. 13—17 mm. South-Paeifie (Juan Fernandez). Shore. 15. O. pickeringii Dana 1853 & 55 O.p., O. pickeringi, J. D. Dana in: U. S. expl. Exp., v.13u p.882, 1595; 1.59 f.9 (3) | 1862 O. pickeringiüi, Bate, Cat. Amphip. Brit. Mus., p.32 t.5 f.6 | 1879 O. macleayana, Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.250 t.7 f.2 | ?1885 Allorchestes crassicornis var. coogeensis, Chilton in: P. Linn. Soe. N.S. Wales, v.9 p.1035 t.46 f.1 a, b | 1893 Orchestia gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 499. Body not very stout. Side-plates not deep, 5" nearly or quite as deep as 4:h, Pleon segment 3, postero-lateral angles quadrate, with minutely produced point. Eyes variable in size, shape and distance apart, dark. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2, 3 joints of peduncle subequal in length, flagellum 4—6-jointed. Antenna 2 scarcely half as long as body, ultimate joint of peduncle not greatly longer than penultimate, both becoming broad in J, flagellum longer(?) than pedunele (Dana), with 12-joints, 1° in Q representing 3 or 4 coalesced. Maxilla 1, palp very minute. Gnathopod 1 in Q', 5tt joint much longer than 6", with narrowly rounded pellucid process, 6% with broadly rounded process, not overlapped by the finger. Gnathopod 2 in J, 6tk joint large, ovate, palm with 2 (sometimes coalesced) convex spinulose processes, the one near the finger-hinge much the broader (not in Dana’s figure); finger stout, evenly curved (in Dana rather sinuous), reaching recess formed by advance of hind margin beyond 24 process of palm. Gnathopod 1 in O2, 6th joint narrowly oblong, with small apical pellucid process, overlapped by the finger. Gmnathopod 2 in Q, 24 joint well expanded above, 4!h scarcely lobed, 6!" nearly as broad and long as 5t", the produced apex well rounded. Peraeopod 5, 24 joint as usual considerably broader than in peraeopods 3 and 4; 4th and 5th joints rather stout, eylindrical in peraeopods 4 and 5. Pleopods very‘slender. Uropod 1, outer ramus with spines only at apex. Uropod 3 small, ramus shorter than pedunele L. about 12 mm. Paeific(Hawaiian Islands; California; New South Wales). Among decaying sea-weed. | | Örchestia 539 16. O.nitida Dana 1852 O.n., J. D. Dana in: P. Amer. Ac., v.2 p.204 | 1853 & 55 O.n., J. D. Dana in: U.S. expl. Exp., v. 1311 p.868; 1.58 f.5a—f (f.6a—d?) | 1862 O.n. + 0. fuegensis, Bate, Cat. Amphip. Brit. Mus., p.29 t.5 £.1; p.17 t.la f.2 | 1893 O. gammarellus (part.) + O. chilensis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.499, 498. Body compressed. Side-plates of moderate size, 5! decidediy less deep than 4. Pleon segment 3, postero-lateral corners slightly recurved. Eyes round. Antenna 1 reaching end of penultimate joint of pedunele of antenna 2 (Dana) (Bate: beyond it), flagellum 5-jointed. Antenna 2 shorter than half the body (Dana); pedunele short, ultimate and penultimate joints subequal, flagellum 14- or 15-jointed, flattened. Gnathopod 1 in C, 5tk joint eonsiderably longer than 6", with subapical process, 6" apically widened, obliquely truneate (Dana), the obliquity slight in the figure; finger not quite reaching extremity of apical process. Gnathopod 2 in J, 6% joint large, subovate, palm straight, nearly longitudinal, with terminal groove for apex of long finger (Dana), oblique (Bate). Gnathopod 1 in ©, 6! joint narrowly oblong, finger overlapping the short palm (Bate; not observed by Dana). Gnathopod 2 in 9, 4% joint with scabrous apical process, 5t with free hind margin bulging, 6!" narrowly produced beyond the longitudinal finger. Peraeopods 4 and 5 with numerous short spines on the slender 5tk and 6th joints. Uropod 1, outer ramus with only apieal spines. Colour green. L. about 8—12 mm. Tierra del Fuego (among floating Fucus, near the shores); Port Famine. 17. O.humicola Marts. 1868 O. h., E. v. Martens in: Arch. Naturg., v. 341 p-56 | 1888 O.h., T. Stebbing in: Rep. Voy. Challenger, v.29 p.884 | 1892 O.h., M. Weber, Reise Niederl. O.-Ind., v.2 p.569 | 1893 O. h., A. Della Valle in: F. Fl. Neapel, v.20 p. 509. Side-plates 1—4 comparatively large, rounded, the 5t" somewhat less deep and much narrower than the 4, Pleon segment .3, postero-lateral corners quadrate, margin above irregularly serrulate.. Eyes long-oval, rather more than the smaller diameter apart. Antenna 1, flagellum shorter than peduncle, 3—5-jointed. Antenna 2 half as long as body, flagellum as long as peduncle, 12—15-jointed. Gnathopod 1 in J, 5tk joint with inconsiderable distal convexity, 6" distally widened, palm sinuous, finger strong, reaching end of apex of 6% joint. Gmathopod 2 in J, 6*h joint strong, long-oval, palm long, gently convex, spinose, oblique, finger long and strong, ending with abruptly narrowed eylindrical apex, overlapping the palm. Gnathopod 1in oO, 5th joint not very long, 6tk not distally widened, palm very short, concave, finger large, hooked, overlapping palm. Gnathopod 2 in-O, 4" joint distally lobed, 5!" with free part of hind margin bulging, 6!" not far nor yet broadly produced beyond the little oblique palm. Peraeopod 5, 24 joint rather strongly serrate or erenulate on upper part of hind margin. Uropod 1, rami considerably shorter than pedunele, outer ramus with only apieal spines. Uropod 3, conical ramus as long as peduncle, with an apical spine. L. nearly 8 mm. Japan. Among damp fallen leaves. 18. ©. floresiana M. Weber 1892 O.f., M. Weber, Reise Niederl. O.-Ind., v.2 p- 562 f. 9—12. Pleon segment 3, postero-lateral corners produced to a point, margin above eonvex, smooth. Eyes round, somewhat less than the diameter apart. 540 Orchestia Antenna 1, joints of peduncle successively shorter, flagellum shorter than pedunele, 4-jointed. Antenna 2 about '/;, as long as body, ultimate and penultimate joints of peduncle elongate, flagellum 12—16-jointed. Gmatho- pod 1 in Cd, 5th and 6th joints strongly produced apically, 6" shorter than 5th, finger overlapping palm, but not reaching end of apical process. Gnatho- pod 2 in d, 6th joint large, oval, palm not very convex, ending in long groove for apex of the long finger. Gnathopod 1 in Q, 5th joint longer than 6t%, not greatly widened distally, 6% narrowly oblong, finger a little longer than palm. Gnathopod 2 in ©, 5tk joint not longer than 6, hind margin bulging, 6% broadly produced beyond the little concave palm and longitudinal finger. Peraeopod 5, 24 joint with spines on front and many spinules on hind‘margin. Uropod 1, rami shorter than pedunele, outer ramus with only apical spines. Uropod 3, ramus rather shorter than peduncle. Flores. 19. O. grillus (Bose) 1802 Talitrus g., Bose, Crust., v.2 p.152 t.15 f.1,2| 1803 T.g., Latreille, Hist. Crust. Ins., 0.6 p.300 | 1840 T'. gryllus, Orchestia (part.)?, H.Milne Edwards, Hist. nat. Crust., ©.8 p.17 | 1844 O. g., De Kay, Zool.N.-York, v.6 p.36 t.7 f.19 | 1862 O. g., Bate, Cat. Amphip. Brit. Mus., p.18 t.3 f.2 | 1847 O.g. (Scamballa sayana Leach in MS.), A. White, Crust. Brit. Mus., p.86 | 1873 O. palustris, (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p.555 | 1893 O. gammarellus (part.)?, A. Della Valle in: F. Fl. Neapel, «.20 p.511. Much resembling O. gammarellus (p. 532). Pleon segment 3, postero- lateral corners acute, a little produced, margin above almost smooth. Eyes. subrotund, rather large, dark, nearer together than their width. Antenna 1 about reaching end of penultimate joint of pedunele of antenna 2. Antenna 2 rather slender, flagellum 17—25-jointed. Gnathopod 1 in J, 4" joint with concave distal margin, 5!" joint with subapical process prominent, narrow, 6'h with apical widening strongly produced outward and a little downward, finger matching apical margin. Gnathopod 2 in d, 24 joint not distally widened, 6! becoming very large, oval, palm spinulose, subequal to hind margin, oblique, eonvex between 2 slight depressions, finger large, the point not very acute. Gnathopod 1 m Q, 5tt and 6tk joints spinose, 6th narrow, parallel-sided, finger matching or overlapping the small, slightly concave palm. Gnathopod 2 in ©, 24 joint broadly laminar, hind margin nearly straight, front strongly convex except just at distal end, 5th rather broad, 6th distally produced beyond the slightly oblique finger. Peraeopod 2, inner _ margin of finger scarcely irregular. Peraeopods 4 and 5 with 4 —6th joints. long and slender, even in the largest specimens of both sexes. Uropod 1, rami shorter than peduncle, both with marginal spines. Uropod 3, ramus shorter than pedunele. Telson spinulose. L. reaching in Q 18, in S 22 mm. Atlantic coasts of North America. Under vegetable detritus and sand, also in salt- marshes and up to fresh water; at times above high-water mark in almost dry places. 20. O. platensis Kroyer 1845 O. p., Kroyer in: Naturh. Tidsskr., ser.2 v1 p-.304 t.2 f.2 | 1862 O.p., Bate, Cat. Amphip. Brit. Mus., p.19 t.3 £.3 | 1867 O. crassi- cornis, A. Costa in: Annuario Mus. Napoli, v.4 p.38 | 1895 O. c., Chevreux in: Rev. biol. Nord France, v.7 p.154 | 1873 O.agilis, (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p.555 t.4 f.14 | 1893 O, gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 499 | 1883 O. tiberiadis, L. Lortet in: Arch. Mus. Lyon, v. 3 p. 190 £.- 1888 OÖ. ineisimana, Chevreux in: Ü.-R. Ass. Frane., Sess. 17 ».2 p. 346 t.6 £.1,2. Orchestia 541 Pleon segment 3, postero-lateral corners quadrate, margin above serrulate. Eyes elliptie, black, nearer together than the longer diameter. Antenna 1 scarce- ly reaching end of penultimate joint of pedunele of antenna 2. Antenna 2 less than half as long as body, pedunele stout, ultimate joint longer than penultimate, flagellum shorter than peduncle, tapering rather conspicuously, 12—15-jointed, strikingly flattened. Gnathopod 1 in JS, 5 and 6th joints both strongly produced distally on hind margin, the 6% rather the more stoutly and a little downward, finger matching apieal margin. Gnathopod 2 in C, 24 joint not widened distally, 6% rather large, broad, palm more or less oblique, smoothly convex or having near the finger-hinge a broad spinulose convexity, followed by a much smaller lobe between 2 little notches, the long curved finger closing down with a narrow apical piece into the pocket adjoining the 24 notch. Gnathopod 1 in O, 5tk joint a little subapically widened, 6'k slightly narrowed distally, with a feebly developed palm, which is overlapped by the finger. Gnathopod 2 in oO, 24 joint laminar, the expansion narrowing distally, 5% with free part of hind margin evenly convex, 6! not much shorter than 5%, the minute finger slightly oblique. Peraeopod 2, finger abruptly narrowed at the nail. Peraeopods 3—5, 4 joint thick, 5th joint in peraeopods 4 and 5 also thick, but without any great widening. Branchial vesicles of gnathopod 2 extremely sinuous. Uropod 1, apical spines on both rami, marginal only on one. Uropod 2 stout. Uropod 3, ramus rather shorter than pedunele. Telson spinulose. Colour dull greyish brown (Kroyer). L. 10—15 mm. Banks of Rio de la Plata (N. W. of Montevideo); Atlantie coasts of North-America (from Bay of Fundy to New Jersey); Bermudas; Mediterranean; Lake of Tiberias [Palestine]. 21. O.sulensoni Stebb. 1899 O.s., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v».7 p.400 t.30C. : Oo unknown. — 9. Integument (in spirit) membranaceous, iridescent. Side-plates not deep. Pleon segment 3, postero-lateral corners quadrate, point scarcely produced. Eyes not very large. Antenna 1, 1° joint at least as broad :as long, 24 and 39 each slightly longer, flagellum with 4 joints, together about as long as 34 joint of pedunele. Antenna 2, peduncle stout, ultimate joint rather longer than penultimate, flagellum shorter than peduncele, 18—21-jointed. Gmathopod 1, 4% joint without apical process, 5tt with prominent, narrowly rounded, distal pellueid process, 6!" oblong, widening very slightly to the palm, which has no conspicuous process and is over- lapped by the finger. Gnathopod 2, 24 joint comparatively slender, 5'" very small, completely masked by 4", 6tk very large, fringed with spinules on the hind margin, widening to the palm, which is moderately oblique, spinuloge, smoothly convex between a blunt defining tooth and a deep depression near the finger-hinge, the depression corresponding with a rounded process of the finger’s inner margin. Peraeopod 1 conspieuously longer than peraeopod 2, both slender. Peraeopod 2, finger short, with 2 notches. Peraeopods 3 and 4, 24 joint oval. Peraeopod 5 having its 24 joint considerably larger, and the oval modified by the straightness of its hind margin, the remaining joints slender. Uropod 1, upper ramus with lateral spines, rather shorter than lower ramus, which has no lateral spines. Uropod 2, rami equal, both with lateral spines. Uropod 3, ramus not half as long as pedunele. L. 10 mm. Madeira? 22. O. parvispinosa M. Weber 1892 O.p., M. Weber, Reise Niederl. O.-Ind., v.2 p. 566 f.17—19. 542 Orchestia Q. Pleon segment 3 as in O. floresiana (p. 539), with postero-lateral corners less produced. Eyes round, as far apart as the diameter. Antenna 1, flagellum shorter than pedunele, 3-jointed. Antenna 2 about '/, as long as body, flagellum 11—-13-jointed. Gnathopod 1 said to be nearly as in O. floresiana, but figure gives 6% joint more narrowed apically, with longer finger. Gnathopod 2, 4 joint distally lobed,. 5tt narrow at base, distally widened into a lobe, 6% rather narrowly produced beyond the very oblique palm. Peraeopod 5, 24 joint broadly expanded, with few spinules on hind margin. Uropod 1, rami shorter than peduncle, both with lateral as well as apical spines. Uropod 3, conical ramus only half as long as peduncle, with long apical spine. L. 8 mm. — J unknown. Java (Mount Salak, at 1575 m height). Under stones and decaying timber. 23. O. montana M. Weber 1892 O. m., M. Weber, Reise Niederl. O.-Ind., v.2 p. 567 f.20-—22. Pleon segment 3, postero-lateral corners obtusely produced. Eyes roundish, less than the smaller diameter apart. Antenna 1, flagellum shorter than pedunele, 4-jointed. Antenna 2 '/, as long as body, flagellum as long as peduncle, 12—15-jointed. Gnathopod 1, 5t% joint longer than 6t%, free part of hind margin convex, not lobed, 6% oblong, comparatively broad, slightly widened distally, finger matching the transverse palm. Gnathopod 2, 4! and the long 5t" joint distally lobed; 6! also long, rather narrow, produced much beyond the small, oblique palm. Peraeopod 5, 24 joint broadly expanded, serrate, spinulose. Uropod 1, outer ramus with only apical spines. Uropod 3, ramus conical, smaller than peduncle, with only apical spines. L. 12 mm. — | unknown. South Celebes. Under stones and fallen leaves, at 1150 m height. O. beaucoudraii (M.-E.) 1830 Talitrus b., H. Milne Edwards in: Ann, Sei. nat., v.20 p.364 | 1862 Orchestia b., O. littorea (part.: 2)?, Bate, Cat. Amphip. Brit. Mus., p. 369. Bay of St. Malo (Chausay Islands). O. constricta A. Costa 1857 O.c., A. Costa in: Mem. Acc. Napoli, v.1 p.183 | 1862 O. mediterranea (part.) (O. constructa), Bate, Cat. Amphip. Brit. Mus., p. 24 | 1866 O. montagui (err., non Audouin 1826?), Cam. Heller in: Denk. Ak. Wien, v.26u p.3 | 1868 O. bottae (err., non Milne Edwards 1840?), Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.117 | 1893 O. chilensis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 509. ö. Peraeopod 5, 4th and 5th joints not dilated. L. 22 m. Adriatie (Terra d’Otranto). _ O.inaequalis Heller 1861 O.i., Cam. Heller in: SB. Ak. Wien, v.441 p.289 | 1888 O.i., T. Stebbing in: Rep. Voy. Challenger, v.29 p.330 | 1893 O.i., A. Della Valle in: F. Fl. Neapel, v.20 p. 509. Anomalous O. gammarellus (p. 532) or O. montagui (p.533). L. 16 mm. Red Sea. O. novaezealandiae Bate 1862 O.n.-z., Bate, Cat. Amphip. Brit. Mus., p. 20 t.3 f.5 | 1881 O. sylvicola (err., non J. D. Dana 1852!), G. M. Thomson in: Tr. N. Zealand Inst., v.13 p.208 ete. | 1893 O. DEE (part.)?, A. Della Valle in: F. Fl. Neapel, ©.20 p.510. 2. Gnathopod 1, 6th joint well developed, longer than 5th. Peraeopod 3 as long as peraeopod 4 or 5, 2d joint long. L. about 6 mm. New Zealand. a ee a al a a a a Fe BEN Ss / ; | 3 F ER Örchestia, Talorchestia 543 O. ochotensis F. Brandt 1851 O, o., F. Brandt in: Bull. phys.-math. Ace. St.-Pötersb., «.9 p.140 | 1851 O.o., F. Brardt in: Middendorff, Reise Sibirien, v. 21 p- 74 t.6 f.18—26 | 1862 O.o., Bate, Cat. Amphip. Brit. Mus., p.369 t.1a f.9 | 1893 O. gammarellus (part.). A. Della Valle in: F. Fl. Neapel, 0.20 p.499. L. 12 mm. Sea of Ochotsk. O. rectimana Dana 1852 O.r., J.D. Dana in: P. Amer. Ac., v.2 p.203 | 1853 & 55 O. tahitensis, J. D. Dana in: U. S. expl. Exp., v.13u P. 877; t.59 f.5a—g | 1862 O.t., Bate, Cat. Amphip. Brit. Mus., p. 33 t.5 £.8. : Perhaps a species af Talorchestia. L. 2 6-8 mm. Tahiti. In damp places at 457 m above sea-level. 5. Gen. Talorchestia Dana 1847 Scamballa (part.), (Leach in MS.) A. White, Crust. Brit. Mus., p.86 | 1852 Subgen. Talorchestia, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.310 | 1853 Subgen. T., J. D. Dana in: U. S. expl. Exp., v.13u p. 851 | 1857 T., Bate in: Ann. nat. Hist., ser.2 v.19 p.135 | 1888 T7., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 257, 262 | 1891 7., T. Stebbing in: Ann.nat. Hist., ser. 6 v.8 p.328|1893 T'., Chevreuxin: Bull. Soc. zool. France, v.18 p.127|1885 Talorchestes, Thalorchestia, Filhol in: Recu. Passage Venus, v.31 Zool. p.459, 461; Planches p. 28. Like Orchestia (p.530), except that gnathopod 1 in O (Fig. 94) is simple, instead of subchelate. Peraeopod 2 ‚usually has the inner margin of the finger more sharply FR RN, constrieted than in allied genera. Gnathopod 1. Sea-shores, 'widely distributed, generally in sand. 19 accepted and 2 doubtful species. Synopsis of accepted species: Gnathopod 2 in J, palm defined by tooth or process — 2. Gnathopod 2 in d, palm without defining tooth or process — 12. 1 Peraeopod 5, 2d joint exceptionally expanded 1. T. scutigerula. . . . p.544 Peraeopod 5, 2d joint not exceptionally expan- ded — 3. 2 Gnathopod 2 in d having a very deep palmar cavity — 4. Gnathopod 2 in not having a very deep palmar cavity — 5. Gnathopod 2 in d, defining tooth of palm ° | 3 immensely long A RE EB LE TA 2. T.darwini...- - - p- 545 Gnathopod 2 in S, defining tooth of palm . not immensely long . . ..2...... 3. T. deshayesii . . . . p.545 Gnathopod 2 in 3, palm defined by 2 teeth — 6. Gnathopod 2 in d, palm defined by a single tooth — 7. Gnathopod 2 in d, palm with a tooth in addition to the defining teeth . .. . . 4. T.tridentata . -. . . p.546 Gmnathopod 2 in d, palm without tooth ad- ditional to the defining teeth. .... . 5. T. pravidactyla. . . p.546 5 44 Talorehestia Gnathopod 2 in d, finger with great pro- tuberance on inner margin. . .». .. . a 3 0 p- 547 Gnathopod 2 in d, finger without great pro- tuberance on inner margin — 8. Gnathopod 2 in d, palm with tooth near finger-hinge a nn ae 7. T.quoyana...... p- 547 Gnathopod 2 in g, RE without tooth near finger-hinge — 9. 9 Gnathopod 2 in d, 6th joint subquadrate. . 8. T. quadrimana . . . p.548 Gnathopod 2in 3, 6th joint not subquadrate — 10. Gnathopod 1 in 9, finger shorter than apex of Bih Soink. 2.20 sa te eh 9. T. diemenensis . . . p.548 Gnathopod 1 in d, finger not shorter than apex of 6th joint — 11. Eyes unusually large, antenna 2 of moderate 11 5 length. 0. we nu en 10. T. megalophthalma . p. 549 Eyes of moderate size, antenna 2 elongate . 11. T.longicornis. . p- 549 oJ Gnathopod 1 in d chelate ......... 12. T. pollieifera . . . . p.550 3 Gnathopod 1 in & subchelate — 18. Peraeopod 4 in 3, 4th and 5th joints expanded Bey ne N u 18. D.timida. : 7... p. 550 Peraeopod 4 in d, 4th and 5th joints not expanded greatly — 14. Peraeopod 5 in d, 5th joint enormously ex- DRnaod, 2 7m ein Sees 14. T.telluriss . .. . . p. 551 Peraeopod 5 in g, 5th joint not enormously expanded — 15. 15 Peraeopods 3-—5, 2d joint little expanded. . 15. T.graeilis ... . - p- 551 Peraeopods 3— 5, 24 joint well expanded --16. Gnathopod 2 in Z with process of the palm near Anger-kinae: - 7.2, N, 16. T. spinipalma. . . . p.552 Gnathopod 2 in S, without process of the palm near finger-hinge — 17. 17 Gnathopod 2 in 8, palm very oblique ... . 17. T. brito. Be p- 552 Gnathopod 2in 3, palm not very oblique —18. Gnathopod 2 in d, palm excavate near finger- Dinbesi. on I 18. T. novaehollandiae . p. 558 Gnathopod 2 in d, palm not excavate near . Dupermhinge 5 u. nen an 19. T. martensi . . . . p.553 1. T. scutigerula (Dana) 1853 & 55 Orchestia s., J. D. Dana in: U.S. expl. Exp., v.1311 p. 863; 1.58 f.2 | 1862 O. s., Bate, Cat. Amphip. Brit. Mus., p. 26 t.4 £.7| 1893 O.s., A. Della Valle in: F. Fl. Neapel, v.20 p. 497 t.57—60. Body rather compressed. Side-plate 1 in d more quadrate than usual, and not much overlapped by side-plate 2, 4! rather large, much deeper than 5, Pleon segment 3, postero-lateral corners acutely quadrate. Eyes small, round, dark, farther apart than their width. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2 or beyond it, joints of pedunele very short, flagellum 5-jointed. Antenna 2 from '/,—"/, as long. as body, ultimate joint of peduncle not nearly twice as long as penultimate, flagellum rather longer than peduncle, about 15—18-jointed. Gnathopod 1'in d, 5th joint not greatly longer than 6#h, its subapical process well developed, 6th with process so well developed that the finger only reaches the end without Talorchestia 545 overlapping. Gnathopod 2 in J, 5b joint extremely small, 6!" massive, palm well defined, almost transverse, with a triangular tooth very near the finger-hinge, or in the form deseribed by Dana rather near the centre, finger well arched, inner margin slightly projeeting where it meets the palmar process. Gnathopod 1 in Q, 6*% joint too much narrowed distally to make the limb subehelate. Gnathopod 2 in Q, 6% joint nearly as long as 5, pro- duced beyond the small finger. Peraeopod 2 with the usual notch in the finger. Peraeopod 3, 24 joint rather squarely rounded. Peraeopod 4, 24 joint similar to that of peraeopod 3 but larger. Peraeopod 5 longer and stouter than peraeopod 4, 24 joint with elliptic shield-like hinder expansion produced above the side-plates and also downward, but much narrower in O than in d. Telson not longer than broad, D-shaped. Colour greenish brown. L. 18—21 mm. Nassau Bay (Tierra del Fuego), among cast up sea-weed; South-Atlantie (Hermit Island; Falkland Islands). 2. T. darwinii (Fr. Müll.) 1864 Orchestia d., Fritz Müller, Für Darwin, p. 16 £.7—9 | 1893 O. deshayesii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 507. a 9 unknown. — d. Side-plate 1 is very small, side-plate 2° much e larger than any of the others. Eyes rounded, black. Antenna 1 very small, \ not reaching middle of penultimate joint of pedunele of antenna 2; antenna 2, ultimate and penultimate joints of peduncle equal, flagellum subequal to pedunele, 13-jointed. Gmathopod 1, 5tk and 6" joints apically dilated, finger shorter than apex of 6tk joint; gnathopod 2, 34 joint lobed in front, 5! very small, 6 very large, in younger J having the palm almost chelately produced with bilobed ending, the blunt finger with strong median lobe, the apex slightly overlapping palm, in elder Ö the hind margin produced into a long tooth slightly beyond finger-hinge, from which it is separated by a deep and wide triangular cavity, the finger broad and straight with a blunt sort of hook overlapping end of above-mentioned tooth. Peraeopods 3 and 4, 24 joint narrow, peraeopod 5 longer than the preceding peraeopods, with much broader 2° joint, other joints slender. L.? (Description based on Müller’s drawings.) Brazil. Near the shore, under leaves, dung, and the loose earth thrown up by burrowing erabs. 3. T.deshayesii (Aud.) 1826 Orchestia d., Audouin in: Deser. Egypte, v.lıv p.93 Orust. t.11 £.8 | 1847 O.d. (Scamballa kuhliana Leach in MS.), A. White, Crust. Brit. Mus., p.86 | 1866 O.d., Cam. Heller in: Denk. Ak. Wien, v.2611 p.3 t.1f.5, 6 | 1868 O.d., Czerniavski in: Syezda Russ. Est., Syezda 1Zool. p.131 t.8 f.52, 53 | 1887 O.d., T. Barrois, Note Orchesties, p.6 £. | 1893 ©. d. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.507 t.2 .5; 1.15 f. 15—30; t.57 £.70-—73 | 1893 Talorchestia d., Chevreux in: Bull. Soe. zool, France, v.18 p.127 f. | 1899 T. d., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.400 t.304 | 1848 Orchestia gryphus, Friedr. Müller in: Arch. Naturg., v.141 p.57, 62 1.4 f.18, 28 | 1888 O.g., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 226, 421. Back moderately broad, peraeon segment 1 longer than 24. Side-plates shallow, 1° less deep and narrower than the following 4; 5'" in front about as deep as 4th. Pleon segment 3, postero-lateral corners sharply quadrate. Eyes rounded, dark, often wider apart than their width. Antenna 1 some- times not reaching end of penultimate joint of peduncle of antenna 2, 24 joint subequal to 1°, flagellum shorter than peduncle, 5- or 6-jointed. An- tenna 2 very variable, ultimate joint of peduncle sometimes 2'/,, times as long as penultimate, flagellum shorter than peduncle, with about 20 joints, most of them carrying calceoli (Barrois). Maxillipeds, palp with a rudiment of 4 joint (Della Valle). Gnathopod 1 in JS, 5th joint at apex of hind Das Tierreich. 21.Lief.: T. R. R. Stebbing, Amphipoda 1. 35 546 Talorehestia margin with conspicuous pellueid process, 6% joint shorter, with similar but stouter process, finger with sinuous inner margin, a little overlapping palm. Gnathopod 2 in C, 4 and 5tk joints very short, 6! very long, hind margin produced almost from the base into a curved tooth, within which the long finger closes, leaving a cavity between its concave inner margin and the long oblique, almost straight palm; the main part of the hand has a conical shape, the palm and front margin being comparatively little divergent. Young 9 (Barrois, Heller, Czerniavski?) has the hand of gnathopod 2 with a palm chelately produced, or excavate at right angles to the hind margin, or more or less oblique. Gnathopod 1 in Q without processes on 5tl and 6th joints, 6! at apex but little stouter than base of finger. Gnathopod 2in oO, 24 joint wider above than below, 5! wider proximally than distally, 6th shorter than 5tk. Peraeopods 1—5 very spinose, in general nearly as in T. quoyana. Uropod 3, ramus shorter than peduncle Telson obtusely triangular, slightly emarginate, spinulose. Colour light brownish yellow, with rows of darker spots; sometimes dorsum carmine red. L. reaching 15 mm. European coasts from Baltie and England (in Devon only in sand) to the Black Sea; Egypt. ; 4. T. tridentata Stebb. 1899 7. t., T. Stebbing in: Tr. Linn. Soc. London, ser.2 ©.7 p.398 t. 302. Body not very broad. Side-plates 1—4 scabrous, quadrate, 24—4th deeper than 1%. Eyes roughly oval, rather more than their longer diameter apart. Antenna 1 very small, not reaching middle of penultimate joint of peduncle of antenna 2. Antenna 2 about '/, as long as body, ultimate joint of peduncle twice as long as penultimate, flagellum scarcely as long as peduncle, flattened, with about 24 short transverse joints. Gmnathopod 1 in d spinose, 5tk joint long, the subapical pellueid process narrow, very prominent, 6t% joint rather narrow, the apical pellueid process prominent, finger with sinuous inner margin, extending beyond the process of 6! joint. Gnathopod 2 in C, 24 joint channelled, apices of front scarcely lobed, 5th joint diminutive, 6 very large, hind margin fringed with spinules, palm oblique, having near the finger-hinge a large triangular spinulose tooth, followed by a sinuous slope, and defined from hind margin by 2 teeth side by side, finger very large, with swelling near the hinge, and beyond. this the concave margin fringed with small spinules. Peraeopod 2 much shorter than peraeopod 1, finger with strong prominence near base of nail. Peraeopod 3 very short, 24 joint nearly as broad as long. Peraeopods 4 and 5 not very elongate, but much longer than peraeopod 3. All peraeopods spinose, with rather small branchial vesicle. Uropod 1 long, rami much shorter than peduncle, both with marginal spines. Uropod 2, rami not shorter than peduncle, stoutly spined. Uropod 3, ramus as long as pedunele or longer. Telson short, spinulose. L. 11 mm. North-Pacifie (California). 5. T. pravidactyla Hasw. 1880 7. »p., Haswell in: P. Linn. Soe. N. S. Wales, v.5 p.100 t.5 £.5. Body stout. Eyes small, round, black, wide apart. Antenna 1 reaching beyond penultimate joint of peduncle of antenna 2, flagellum in Q 7-, n 9 10-jointed. Antenna 2 in S more than thrice as long as antenna 1, ultimate joint of peduncle more than twice as long as penultimate, flagellum as long : \ 3 = B a } a nt u a aa le a Talorchestia 547 as ultimate joint of peduncle, 21-jointed. Antenna 2 in © much smaller than in d, 15-jointed. Gmathopod 1 in Q', 6% joint rather long, widening a little distally, hind margin produced into a short narrow process, palm transverse, concave, finger rather longer than palm. Gmathopod 2 in J, 6!" joint large, palm oblique, defined by a blunt tooth, with a second tooth elose to it on the distal side, and a rounded elevation about the middle; finger geniculate, its apex lying between the two palmar teeth when the hand is closed. Whether the palmar teeth are side by side or successive is left indefinite by the figure, which in fact shows neither of them. Gnathopod 1 in oO, 5th joint much longer and broader than the narrow 6%, which has a pellucid process too small to give the limb a subchelate character. Gnathopod 2 in ©, 6tk joint thrice as long as broad, not much produced beyond the finger. Peraeopods 1—5 spiny and robust, peraeopods 3—5, 24 joint broadly rounded, in peraeopod 5 very broad and somewhat produced downward. Uropods 1—3 and telson plentifully furnished with marginal and apical spines and spinules.. L. 15—17 mm. | South-Paeifie (Tasmania). ı 6. T.limicola Hasw. 1880 7.1, Haswell in: P. Linn. Soe. N.S. Wales, 0.5 p-98 t.5 f.2 | 1893 Orchestia l., A. Della Valle in: F. Fl. Neapel, v.20 p. 505 t.57 £.64. Antenna 1 very short, flagellum 5-jointed. Antenna 2 four times as long as antenna 1, flagellum as long as peduncle, 12-jointed. Gnathopod 1 in JG, 5th joint with large subapical process, 6" oblong with distal widening, palm transverse, slightly overlapped by finger. Gnathopod 2 in S, 6!" joint large, broadly oblong, palm transverse, defined by a broad, apically notched tooth, followed by an excavation to match the great central process of the broad but pointed finger. Gnathopod 1 in ©, 5t* joint little longer than 6%, which narrows to an apex not broader than base of finger. Gnatbopod 2 in ©, 5th and 6th joints subequal, 6% produced considerably beyond the longitudinal finger. L. 9 mm. Queensland (Bowen). In Mangrove swamps, under decaying wood, etc. 7. T. quoyana (M.-E.) 1840 Talitrus brevicornis + Orchestia q., H. Milne Edwards, Hist. nat. Crust., v.3 p.15,19 | 1840 O.g., H. Milne Edwards in: G. Cuvier, Rögne an., ed.3 Crust. 1.59 f.4 | 1895 O.g., A. Della Valle in: F. Fl. Neapel, v.20 p- 506 t.57 f.68.| 1886 Talorchestia q.,, G. M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.146 | 1852 Talitrus novi-zealandiae, J. D. Dana in: P. Amer. Ac., v.2 p. 201 | 1858 & 55 Orchestia (Talitrus?) n. + T. brevicornis + O. (Talorchestia?) quoyana, J. D. Dana in: U.S. expl. Exp., v. 1311 p. 852 t.56 f.5; p.854 1.56 1.6; p-863 t.58 f.1 | 1862 Talitrus b., Orchestia b. + Orchestoidea? n. + Talorchestia q., Bate, Cat. Amphip. Brit. Mus., p.9 t.1a f.6; p.10 t.1£.2; p.16 t.2 £.7 | 1885 Tal- orchestia armata, Thalorchestia a., Filhol in: Recu. Passage Venus, v.311 Zool. p. 460 t.53 £.3; Planches p. 28. Back broad. Side-plate 1 produced forward with rounded angle and straight front margin, side-plates 2—4 quadrate, successively broader, 5tk less deep than 4. Pleon segment 3, postero-lateral corners quadrate, with the hind margin finely serrulate. Eyes dark, irregularly rounded, scarcely their own width apart. Antenna 1 reaching little beyond penultimate joint of pedunele of antenna 2, 1° and 24 joints subequal, each longer than 34, flagellum shorter than peduncle, 8-jointed. Antenna 2, ultimate joint of peduncle in S twice as long as penultimate, less in Q, flagellum subequal to peduncle, with about 30 joints, 27 in Q, 29 ind. Upper lip distally rather narrowly rounded, inner plate with flat distal margin. Maxilla 1 with minute 2-jointed palp. Maxillipeds, 24 joint of palp very broad. Gnathopod lin cC, 35* 548 Talorchestia 24 joint channelled in front, 5!" much longer than 6t, not lobed, 6tk very spinose, distally lobed, palm straight, not oblique, finger reaching beyond it. - Gnathopod 2 in d, 24 and 34 joints channelled in front, 4!" short, square, 5th very short, eup-shaped, 6'% massive, palm oblique, spinulose, with broad rectangular tooth near finger-hinge, and prominent acute defining tooth, within which the finger eloses. Gmnathopod 1 in 9, 6!k joint narrowing to the finger, distally scarcely broader than base of finger, densely spinose. Gnathopod 2 in Q, 24 joint elongate oval, 34 and 4th subequal, 5!" longer than 6, the part free from 4 narrowly oval, 6!" produced with rounded end beyond the small chela-forming finger. Peraeopod 2 shorter than peraeopod 1, finger notched, and that in both sexes. Peraeopod 3 very short, 29 joint almost eircular, 4% and 5th short but rather broad. Peraeo- pod 4 long, 24 joint broadly oval. Peraeopod 5 rather longer, 24 joint as long as in peraeopod 4 but much wider, the broad crenulate expansion giving it a eircular look; 4— 7! joints in peraeopods 4 and 5 long, not especially widened. Pleopods with small rami, shorter than pedunele, 4- or 5-jointed. Uropods 1 and 2 spinose, rami ending obtusely, outer rather the shorter. Uropod 3, the small ramus a little longer than the peduncle. Telson thick, broader than long, faintly emarginate, surrounded with spinules, and looking as if its distal angles were upturned. L. reaching 23 mm. South-Paeifie (New Zealand). 8. T. quadrimana (Dana) 1852 Orchestia q., J. D. Dana in: P. Amer. Ac., c.2 p.204 | 18535 & 55 O.g., J. D. Dana in: U.S. expl. Exp., 0.1311 p.879; 1.59 £.7| 1893 O. q., A. Della Valle in: F. Fl. Neapel, v.20 p.504 t.57 £.63 | 1879 Talorchestia q., Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.248 t.7 f.3 | 1880 T'. q. var.?, Haswell in: P. Linn. Soe. N.S. Wales, v.5 p. 100 t.6 £.1. Side-plates 2—4 broad. Eyes large, round. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2. Antenna 2, ultimate joint of peduncle not much longer than penultimate, flagellum subequal to pedunele, joints not longer than broad. Gnathopod 1 in 9, 6! joint little shorter than 5tk, subtriangular, the expanded distal margin a little excavate, not overlapped by the finger. Gnathopod 2 in JS, 6!" joint stout, subquadrate, palm transverse, slightly excavate. Peraeopods 1 and 2 slight in structure. Peraeopods 3—5 successively longer, only the 24 joint expanded and this in peraeopod 5 (Haswell) much broader than that of the others. Uropod 1, outer ramus unarmed. Uropod 3, ramus slender. Colour white, with irregular light-red spots. L. 12—14 mm. South-Paecifie (New South Wales, Queensland, Port Denison). On sandy beaches, under east up weed above the reach of ordinary tides. 9. T. diemenensis Hasw. 1879 T.d., Haswell in: P. Linn. Soc. N. S. Wales, v4 p.248 t.7 f.6 | 189 T.d., G.M. Thomson in: P.R. Soc. Tasmania, 1892 p.17 t.5 f.6—8 | 1893 T. d., A. Della Valle in: F. Fl. Neapel, v.20 p. 512 | 1891 Orchestia d., T. Stebbing in: Ann. nat. Hist., ser. 6 v.8 p.325 | 1898 O. gammarellus, G. M. Thomson in: Tr. N. Zealand Inst., v.81 p. 198. Antenna 1 very sbort. Antenna 2, flagellum as long as peduncle. Gnathopod 1 in JS, 5tk joint distally broad, 6tk oblong, twice as long as- broad, palm transverse, slightly sinuous, finger short, in figure not nearly as long as apex of 6th joint. Gmathopod 2 in JS, 6% joint (in figure) nearly as broad as long, palm convex, moderately oblique, defined by a rounded tooth. Gnathopod 1 in ©, 5tt and 6! joints narrower than in J, the palmar u) ia 4 E: p; . ne a a a a sr 3 ya Ba 1 a En En Be Ben Talorchestia 549 border with a deep median notch, the finger well developed (Haswell); gnathopod 1 in © simply unguiculate (Thomson). Gmnathopod 2 in ©, 5th and 6th joints subequal, 6% produced some way beyond the minute, obliquely placed finger. Telson triangular, blunt. L. 6--13 mm. South-Paeifie (Tasmania). Under stones in estuaries. 10. T. megalophthalma (Bate) ?1844 Talitrus quadrifidus, De Kay, Zool. -N.-York, 0.6 p.36 t.14 f.27 | 1847 Orchestia megalophthalmus (Scamballa m. Leach in MS.) (nom. nud.), A. White, Crust. Brit. Mus., p. 86 | 1851 O. megalophthalmos (nom. nud.), F. Brandt in: Bull. phys.-math. Ac. St.-Petersb., v.9 p.142 | 1862 O. megalophthalma, Bate, Cat. Amphip. Brit. Mus., p.22 t.3 f.8 | 1895 O. m., A. Della Valle in: F. Fl. Neapel, v.20 p.496 t.57 f.54 | 1873 Talorchestia m., (8. I. Smith in:) A. E. Verrill in: Rep. U.S. Fish Comm., v.1 p. 556. Very near to T. longieornis, but back still broader, eyes far larger, these being of exceptional size and only separated by half their width or less, antenna 2 shorter (?), and 6 joint of gnathopod 2 in the JS with long palm, scarcely oblique, gnathopod 2 in the O with 4% joint strongly produced at lower hind angle; uropod 3, ramus less strongly spined. L. 19 mm. North-Atlantie (from Cape Cod to New Jersey [North America]). 11. T.longicornis (Say) 1818 Talitrus l., Say in: J. Ac. Philad., o.1ır p.384 | 1830 Orchestia l., H. Milne Edwards in: Ann. Sei. nat., v.20 p.361 | 1844 O.1., De Kay, Zool.N.-York, 0.6 p.85 t.9 f.28, 28a | 1847 O.1. (Scamballa I. Leach in MS.), A. White, “ 'Crust. Brit. Mus., p. 86 | 1862 O.1., Bate, Cat. Amphip. Brit. Mus., p.18.t.3 f£.1 ! 1893 O.1., A. Della Valle in: F. Fl. Neapel, v.20 p.505 t.57 £.66, 67 | 1851 O.1., Megal- orchestes?, Megalorchestia? l., F. Brandt in: Bull. phys.-math. Ace. St.-Pötersb., v.9 p. 142, 312 | 1873 Talorchestia l., (S. 1. Smith in:) A. E.Verrill in: Rep. U.S. Fish Comm., ©. 1 p. 556. Back broad. Side-plate 1 little produced, narrow, as deep as the 24, which is slightly emarginate behind, 5t® not so deep as 4!" but broader. Pleon segment 3, postero-lateral corners quadrate. Eyes oval, narrowed above, or irregularly rounded, about as far apart as their smaller diameter, dark. An- tenna 1, peduncele about reaching end of penultimate joint of pedunele of antenna 2, 24 joint of peduncle rather longer than 1% or 34, flagellum short, 6-jointed. Antenna 2, ultimate joint of pedunele more than twice as long as penultimate, flagellum in a © speeimen nearly as long as peduncle, 22-jointed. Maxillipeds with no unguiculate terminal joint. Gmathopod 1 in 9, 5% joint with subapical pellucid process outward, 6!" much shorter and narrower, oblong, with slight distal widening into a pellucid process, finger with smooth inner margin, a little overlapping palm. Gmathopod 2 in C, 24 joint abruptly widened from narrow base, 34 larger than 4% or 5th, 6% massive, widening to the palm, which is only a little oblique, defined by a very blunt tooth, between which and the hinge is a eonvex swelling of the palm, or a eonsiderably concavity (in G speeimen 25 mm long, Bate) or a large rounded tooth between 2 cavities (Milne-Edwards). Gnathopod 1 in oO, 5 and 6!» joints without the pellucid processes, 6!" narrowing to the finger- ‚hinge, being there little wider than base of finger. Gmathopod 2 in O, 24 joint broadiy and irregularly oval, membranaceous, 4! quadrate, not produced, 5th a little longer than 6*%, free part of hind margin very convex, 6 elongate, produced much beyond the minute chela-forming finger. Peraeopod 2, finger rather slender, deeply notched. Other peraeopods much as in T. quoyana (p. 547). - Uropod 1, rami equal. Uropod 2, outer ramus the shorter. Uropod 3, ramus longer than peduncle. Telson obtusely triangular, slightly emarginate, with spinules at the 2 points thus formed; a transverse 550 Talorchestia plate only partially free and not reaching the apex is truncate with small median slit. Colour pale greyish, or sand-coloured. L. reaching 25 mm and over. North-Atlantie (from Cape Codto New J ersey [North America]). Burrowing in sand. 12. T. pollieifera (Stimps.) 1855 Orchestia p., Stimpson in: P. Ac. Philad., v.7 p.883 | 1857 O. p., Stimpson in: Boston J. nat. Hist., v.6 p.517 | 1862 Talorchestia p-., Bate, Cat. Amphip. Brit. Mus., p.16 | 1893 Orchestia gammarellus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 510. Eyes rather small, round, black. Antenna 1 in O reaching end of penultimate joint of pedunele of antenna 2. Antenna 2 in S stout, peduncle twice as long as flagellum. Antenna 2 in O slender, flagellum 12-jointed. Gnathopod 1 in J, pellueid process in joint 6 rather unusually produced. Gnathopod 2 in JS, 6% joint ovate, of moderate size. Gnathopod 1 in Q simple. Gnathopod 2 in O with small hands, having a minute lateral finger. Caudal stylets (uropod 3?) short, rami subeonical. Colour pale brownish. L. 15 mm. North-Pacifie (Loo Choo). 13. T. tumida G.M. Thoms. 1885 7. t., G.M. Thomson in: N. Zealand J. Sei., v.2 p.577 | 1887 T.t., T. Stebbing in: Tr. zool. Soe. London, v.12vı p.202 1.39 f.A | 1888 T.t., G. M. Thomson in: Tr. N. Zealand Inst., v.21 p.260 t.13 f.4—8 | 1898 Orchestia t. (part.), G.M. Thomson in: Tr. N. Zealand Inst., v.31 p.203 | 1893 O. gam- marellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 501. Back broad. Side-plate 1 almost concealed by the broader side-plate 2, 4th the widest, irregularly quadrate, deeper than 5tk, Pleon segment 3, postero-lateral corners quadrate. Eyes large, round, less than their own width apart, turquoise-blue. Antenna 1 a little overlapping penultimate joint of peduncle of antenna 2, all 3 joints of pedunele very short, flagellum shorter than peduncle, 7- or 8-jointed in O0, 5-jointed in 9. Antenna 2 less than '/, as long as body, ultimate joint of pedunele about twice as long as the short penultimate, flagellum a little shorter than penultimate, 12—15-jointed in 9, 12-jointed in ©. Upper lip distally broadly rounded. Maxilla 1, palp barely perceptible. Gnathopod 1 in S, 5t" joint considerably longer than 6%, hind margin subdistally forming a small linear lobe, 6! joint oblong, with squarish distal lobe, little produced outward, and over- lapped by the finger. Gnathopod 2 in 9, 34 joint longer than the quadrate 4'h or the small cup-shaped 5th, 6th massive, palm oblique, very spinulose, with 2 deep excavations between which a stout process meets a strong projeetion of finger’s inner margin; in young J the palm and finger are simpler. Gmathopod 1 in ©, 6t% joint oval, very narrow at junetion with the finger which equals it in length. Gnathopod 2 in Q, 6% joint flattened, narrowly oval, distally produced beyond the minute chela-forming finger. Peraeopod 2 shorter than peraeopod 1, finger notched. Peraeopod 3, 24 joint subeircular. Peraeopod 4, 29 joint broadly oval, 4! expanding to the bluntly produced distal end, 5! abruptly widened from a narrow neck and then narrowing, but still at apex much wider than 6%. Peraeopod 5 shorter than 4th, 24 joint very broad, subeireular, erenulate, other joints not specially widened. Pleopods, rami 7-jointed, subequal to peduncle. Uropods 1 and 2, rami spinose, obtuse. Uropod 3, ramus longer than pedunele. Telson as broad as long, with spinules round apical margin. Colour ivory-white. L. 13 mm. South-Paeifice (Dunedin [New Zealand]). Sand-banks, among roots of littoral plants, above high-water mark. 3 E Dh Da re u EN a PEN H u ee I a i [3 & y 2 E t 3 J - : a er a = ah I er FE Kae Ka ST h Ren a EL ET ng Kar Talorchestia 551 14. T. telluris (Bate) 1862 Orchestia t., Bate, Cat. Amphip. Brit. Mus., p.20 t.3 £.6; t.4 f.4 (ineluding f.2h on right) | 1886 O.t., G. M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.145 | 1893 O. gammarellus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 499. Body rather compressed. Side-plates not very large. Pleon segment 3, postero-lateral corners quadrate, with little spinules in the shallow serrations of their hind margin. Eyes round, rather large, dark, less far apart than their width. Antenna 1 in S reaching rather beyond penultimate joint of pedunele of antenna 2, joints of peduncle short, 34 slightly shortest, flagellum shorter than peduncle, 5-jointed. Antenna 2 short, ultimate joint of peduncle not twice as long as penultimate, flagellum subequal to peduncle, with about 15 joints in Ö, rather fewer in ©. Gnathopod 1 in JS, 5tk joint rather longer than 6%, with a small pellueid process at middle of free hind margin, 6% distally produced into a much larger process, which is a little overlapped by the finger. Gnathopod 2 in J, 24 joint rather slender, the next 3 as usual small, 6!" very large, widening to the palm, which forms a triangular tooth between an excavation near the finger-hinge and an oblique convexity passing insensibly into the hind margin; the long finger has a corresponding cavity near the hinge, than a broad protuberance and finally a concavity matching the convexity of the palm. Gnathopod 1 in oO, 5tk joint with no process, 6th spinose, narrowing to the finger-hinge and forming no palm, finger ?/, as long as 6% joint. Gnathopod2 in 9, 24 joint little widened, 4 not produced at hinder angle, 5% with the free portion uniformly widened, 6! nearly as long as 5tk, subapieally widened, produced much beyond the finger. Peraeopod 2 with the finger as usual nötched. Peraeopod 3, 24 joint small, rounded oval. Peraeo- pod 4, 24 joint larger, oval, and the whole limb much longer than peraeopod 3. Peraeopod 5, 24 joint larger in both sexes, but especially in J, nearly eircular but broader below than above, 4! joint in S triangular, widening to the distal end, 5! joint in d expanded behind to a process comparable to a dish-cover and at least sometimes assuming monstrous proportions, its oval being much larger than the 24 joint of its own limb or than the great hand of gnathopod 2; 6% and 7 joints slender as in peraeopod 4. Uropod 1, rami equal. Uropod 2, rami equal or subequal. Uropod 3, ramus rather longer than peduncle. Telson triangular. L. © 9, d 12 mm. South-Pacifie (New Zealand, from Bay of Islands to Stewart Island). Sandy shores, just above tide-marks. 15. T. gracilis (Dana) 1852 Talitrus g., J.D. Dana in: P. Amer. Ac., «.2 p.201 | 1853 & 55 Orchestia (Talorchestia) g., J. D. Dana in: U. S. expl. Exp., v. 13u p-861 1.57 £.5 | 1862 T. g., Bate, Cat. Amphip. Brit. Mus., p.15 t.2 £.5 | 1898 Orchestia gammarellus (part.), Talitrus (part.)?, A. DellaValle in: F. Fl. Neapel, v.20 p.499, 511, 947. Side-plate 5 nearly as deep as 4tk. Eyes in figure rather small, round. Antenna 1 short, not reaching end of penultimate joint of pedunele of an- tenna 2, flagellum shorter than peduncle. Antenna 2 in J longer than the body, penultimate joint of peduncle rather long, but less than half as long as ultimate, flagellum longer than peduncle. Antenna 2 in © longer than half the body, penultimate joint of peduncle */, as long as ultimate, flagellum longer than peduncle. Gnathopod 1 in J, 5t% joint long, showing no pellueid process, 6 con- siderably shorter, distally a little widened, apex of hind margin narrow, finger scarcely overlapping palm. Gnathopod 2 ind‘, 6tk joint large, ovate, palm spinulose, oblique, convex, almost continuous with hind margin, finger long, adjusted to palm. Gnathopod 1 in oO rather stout, 3I—6! joints described 552 N Talorehestia . as subequal, finger quite small. Gnathopod 2 in Q, 2% joint rather expanded, 5th Jittle longer than 6", with hind margin bulging at the centre, 6th produced beyond the minute finger to a rounded lobe, which bends forward, so that the front line of the hand is slightly concave. Peraeopod 2 much shorter than peraeopod 1; the finger is gibbous below, or has a prominent angle and is stout. Peraeopods 3—5, 24 joint narrowly oval. Peraeopod 5 the longest. Uropod 1, outer ramus with spines only at apex. Uropod 3, pedunele rather longer than telson, which the ramus nearly equals. Nearly eolourless. L. about 12 mm. Coral island in the Balabae Passage. 16. T.spinipalma (Dana) 1852 Orchestia s., J.D. Dana in: P. Amer. Ac., v.2 p-203 | 1853 & 55 O. s., J. D. Dana in: U. S. expl. Exp., u. 131 p.875; 1.59 f.4a—e | 1862 O. s., Bate, Cat. Amphip. Brit. Mus., p.28 t.4 f.9 | 1880 Talorchestia terrae-reginae, Haswell in: P. Linn. Soe. N. S. Wales, v.5 p.98 t.5 f.4 | 1893 Orchestia chilensis (part.), A.Della Valle in: F. Fl. Neapel, v.20 p.498 | 1898 O. chiliensis, G. M. Thomson in: Tr. N. Zealand Inst., v. 31 p. 199. Side plates not very deep, 5!" nearly as deep as 4%, Antenna 1 very short, flagellum 3—5-jointed (Dana) (Haswell: 6—8-jointed). Antenna 2, peduncle 4 times as long as antenna 1, flagellum as long as peduncle or shorter, 20-jointed; ultimate joint of peduncle much longer than penultimate. Gnathopod 1 in CS, 5tk joint longer than 6", with small apical process, 6th narrowly oblong, very slightly dilated at apex, palm transverse, finger over- lapping it. Gmathopod 2 in 9, 6'% joint large, subovate, palm spinulose, very oblique, ill-defined, having near the hinge a process, which fits. into a hollow of the elongate finger. Gnathopod 1 in ©, 5% joint longer than 6th, apex of which is scarcely broader than base of short finger. Gmnathopod 9 in ©, 5tk joint widened at middle of hind margin, 6! joint short, the rounded apex little produced beyond the small longitudinal finger. Peraeopods 1—5 spinulose, peraeopods 3—5: with 24 joint well expanded, hind margin of it in peraeopod 5 almost straight with well rounded lower corner; peraeopods 4 and 5 long and slender. Uropod 1, outer ramus with only apical spines. L. 10—12 mm. : Tropical Paeifie (Tongatabu, under sea-weed; Port Denison [Queensland], on sandy beach). 17. T. brito Stebb. 1891 T7.b., T.Stebbing in: Ann. nat. Hist., ser. 6 ©.8 p. 324 t.15 | 1895 T. b., Chevreux in: Rev. biol. Nord France, v.7 p.158 | 1898 Orchestia chilensis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 498. Back moderately broad. Side-plate 1 directed somewhat forward, narrower than the subequal, subquadrate 24—4th, Pleon segment 3, postero- lateral corners quadrate. Eyes large, irregularly rounded, separated by less than their width, in life white, with dark pigment showing through. Antenna 1 not quite reaching end of penultimate joint of peduncle of antenna 2, 3 joints of peduncle subequal, or sometimes in Q 2Xthe longest, flagellum less than half as long as peduncle, 7-jointed in C, 5-jointed in Q. Antenna 2, penultimate joint of pedunele more than half as long as the long and stout ultimate, flagellum with about 30 short joints in S, 22 in 9. Maxilla 1, minute palp 2-jointed. Gnathopod 1 in JS, 5tk joint long, with pellueid bubble-like process near distal end of hind margin, 6'% much shorter, more spinose, with similar process, finger short, projecting beyond palm. Gmathopod 2 in J, 4 joint short, square, 5!" small, cup-shaped, 6!" massive, palm spinulose, scarcely erenulate, ae 2 ee FI a EB LEE EB A Ve 7 Dr a a ZB u ’ » 4 > Talorchestia 553 convex, very oblique, closed finger leaving a small gap near hinge, otherwise fitting palm except at overlapping apex. Gnathopod 1 in © nearly as in J, but without the pellucid processes of 5tk and 6tk joints, the latter narrowing to base of finger. Gnathopod 2 in O almost membranaceous, 24 joint rather narrowly oval, 5t" subdistally widened, 6! with rounded end produced beyond the minute chela-forming finger. Peraeopods 2 and 3 shorter than the rest and with much smaller finger, deeply notched in peraeopod 2, slightly in peraeopod 3. Im peraeopod 3, 24 joint subeircular, in peraeopod 4 broadly oval, in peraeopod 5 as long as in peraeopod 4 but rather wider. In peraeo- pods 4 and 5 joints 4—6 elongate, spinulose, none expanded. Pleopods, peduncle long, membranaceous, rami with 15 or 16 joints. Uropods 1 and 2, pedunele rather longer than the spinose rami. : Uropod 1 much the longest. Uropod 3, ramus about as long as peduncle. Telson narrowest at truncate distal end, surrounded with groups of spinules, Colour yellowish white, with bars of yellow, side-plates bordered with purple, and sometimes pleon banded with the same. L. S 20 mm, © smaller. North-Atlantie (North-Devon, burrowing in sand; Verdon [Gironde]). 18. T. novaehollandiae Stebb. 1899 T.n., T. Stebbing in: Tr. Linn. Soc, London, ser.2 v.7 p.399 t.31.A. Body stout. Pleon segment 2, postero-lateral corners with an acute point, segment 3 quadrate. Eyes round, dark, about their diameter apart. Antenna 1 reaching beyond penultimate joint of peduncle of antenna 2, joints of peduncle not elongate, flagellum shorter than peduncle, 6-jointed. An- tenna 2 verticillately spinulose, about '/, as long as body, ultimate joint of pedunele longer than penultimate, flagellum rather shorter than peduncle, - 19-jointed. Gnathopod 1 in JS, 5tk joint longer than 6%, with narrow apical process, 6% short, much widened distally, finger overlapping palm but not process of hind margin. Gmnathopod 2 in S, 24 joint narrow, 6!" very large, slightly widening to the almost transverse palm, which is defined by a small pocket, a broad convexity leading thence to a spinulose concave space near the finger- hinge, over which space the finger arches, the convexity of its sinuous margin touching the convexity of the palm and its apex passing. into the defining pocket. Gmathopod 1 in 2 see Fig. 94 (p. 543), 6*h joint short, spinulose, narrowing very gradually to the short finger. Gnathopod 2 in O, 24 joint membranaceous, well expanded, 6! joint rather narrow. Peraeopods 1—5 ‚spinulose, 24 joint in peraeopods 3—5 well expanded, largest and broadest in peraeopod 5, with subquadrate ending of hind margin, peraeopod 4 much longer than peraeopod 3, peraeopod 5 considerably longer than peraeo- pod 4, its 4 and 5b joints rather long and stout. Uropods 1—3, on peduncle and all. rami, have marginal spines. Uropod 3, ramus slender, shorter than peduncle. Telson much longer than broad, composed of separate halves, which appear to fold eloselv together, each with 2 apical spinules and 2 marginal spines. L. about 10 mm. South-Paeific (Manly Beach [East-Australia]). 19. T. martensii (M. Weber) 1892 Orchestia m., M. Weber, Reise Niederl. O.-Ind., 0.2 p.564 f. 13—16. Pleon segment 3, postero-lateral corners with produced point. Eyes oval, as far apart as the shorter diameter. Antenna 1, 24 joint of peduncle the longest, flagellum shorter than peduncle, 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle long, flagellum almost as long as peduncle, 554 Talorchestia, Ceina 21—25-jointed. Gnathopod 1 in S, 5tk joint apically furnished with nar- rowly rounded process, 6'% distally little widened, with slightly concave palm, overlapped by the finger. Gnathopod 2 in JS, 6fk joint short but broadly ovate, palm slightly convex and oblique, joining the almost straight hind margin in a gentle curve, the long finger closing between 2 rows of spines which line the palm. Gnathopod 1 in Oo, 5tk joint without process, 6th narrowing to the apex, which is hardly wider than base of finger. Gmnatho- pod 2 in Q, 5tk joint broad, front margin very convex, hind produced into a central lobe, 6 almost as long as 5tk, produced into a broadly rounded lobe bent forward so as to project beyond the minute, longitudinally placed finger. Peraeopod 5, 24 joint with 13—15 spines on the hind margin, which is straight with rounded corners. Uropod 3, ramus rather shorter than pedunele L. oO 11, d 8 mm. Flores. Under stones in and at the margin of the rivulet Lella. T. africana Bate 1862 T.?.a., Bate, Cat. Amphip. Brit. Mus., p.15 t.2 £.6. - 2. Side-plate 5 as deep as the preceding and very broad, nearly as broad as length of 3 segments of peraeon. Eyes small. Antenna 1 as löng as pedunele of antenna 2. L. 14 mm. Port Natal [South Africa]. T.cookii Filh. 1885 T.c., Thalorchestia c., Filhol in: Recu. Passage Venus, v.3ur Zool: p.459 t.53 f.4; Planches p.28 | 1893 ÖOrchestia? cooki, A. Della Valle in: F.F1.Neapel, v.20 p.512 | 1898 O. tumida (part.), G.M. Thomson in: Tr. N. Zealand Inst., v.31 p. 203. Probably identiecal with T. tumida (p. 550). Only described. L. 17 mm. South-Paeifie (New Zealand). 6. Gen. Ceina Della Valle 1893 Ceina (Sp. un.: C. egregia), A. Della Valle in: F. Fl. Neapel, v.20 p. 530 | 1899 C©., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 397. ? Antenna 1 longer than peduncle of antenna 2. Maxillipeds, finger of palp broad, subtriangular. Gnathopod 1 in JG and O, and gnathopod 2 in © subchelate, small. Gnathopod 2 in much larger, subchelate or (in maturity) chelate. Uropod 3 tubereular, without rami. Telson partially eleft. 1 species. 1. C. egregia (Chilton) 1883 Nicea e., Chilton in: Tr. N. Zealand Inst., v.15 p- 77 t.2 f.2a—1 | 1886 N.e., G.M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p. 144 | 1888 N.? e., T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 1712 | 1893 Ceina e., A. Della Valle in: F. Fl. Neapel. 0.20 p.530 t. 58 f. 14—21. Body much compressed, segments imbrieated and subcarinate, more strongly in Q than in J, peraeon segment 1 produced somewhat over the head, especially in ©. Head produced slightly upward at base of antenna 1. Side-plates 1—4 successively deeper, 5tı—7th much shallower. Pleon seg- ment 3, postero-lateral corners rounded. Eyes of moderate size, round. Antenna 1, 24 joint slightly shorter than 1°, 34 than 24, flagellum subequal to peduncle, with sensory filaments. Antenna 2 about ?/, as long as body, ultimate and penultimate joints of peduncle equal, flagellum rather longer than peduncle. Lips, mandihble and maxillae 1 and 2 undescribed. Mandible not showing (in figure) spine-row or molar. Maxillipeds with 2 rounded apical teeth on inner plate, 1° joint of palp produced on outer side beyond la N rn 3 a a ne im eh en nun Ceina, Chiltonia 555 the 24, 34 distally widened, not longer than 4. Gmathopods 1 and 2 in Q equal and similar, 5% joint long, subtriangular, 6% rather longer, not wider, oblong, palm slightly oblique, defined by palmar spine, finger matching palm. Gnathopod 1 ind as in 9. Gmnathopod 2 in JS, 24 joint narrow, 5th apparently coalesced with the large oblong oval 6t&, which in smaller specimens has a short transverse palm, but, the hind margin being gradually produced, at length a complete though small chela is formed. Peraeopods 1—5 subequal, rather stout, almost unarmed, 4tk joint rather expanded distally, finger strong, curved. Peraeopods 3—5, 24 joint rounded oval. Uropods 1 and 2 short, rami subequal to peduncle, spinose. Uropod 3, each member consisting of a single, rounded, unarmed joint; the pleon segment 6 has the appearance of forming a peduncle to the pair. Telson subrectangular, about as broad as long, apically rounded, cleft about to centre. Colour red, sometimes blue; integument thick, opaque. L. 6—7 mm. Lyttelton Harbour [New Zealand]. On sea-weed (Macrocystis). 7. ‚Gen. Chiltonia Stebb. 1899 Chiltonia (Sp. un.: CO, mihiwaka), T. Stebbing in: Tr. Linn, Soc. London, ser.2 v.7 p.408. Side-plates 1—4 deep. Antennae 1 and 2 equal in length. Maxilla 1 without palp, notched at palp’s normal position. Maxillipeds, 4 joint of palp short, conical. Mouth-parts otherwise normal as in the family. Gnathopods 1 and 2 subchelate, gnathopod 2 very unlike in © and in d. Uropod 3 1-jointed. Telson simple. 1 species. 1. C. mihiwaka (Chilton) 1898 Hyalella m., Chilton in: Ann. nat. Hist., ser. 7 v.1 p.423 t.18 | 1899 Chiltonia m., T.Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.408, Body stout, back of peraeon broad. Side-plate 4 much wider than the preceding, much deeper than the following peraeopods. Pleon seg- ment 3, postero-lateral corners quadrate. Eyes small, round. Antenna 1, pedunele rather long, 1° joint as long as 24 and 34 combined, flagellum subequal to peduncle, in JS 10-, in O 8-jointed. Antenna 2, gland-cone promin- ent, ultimate joint of peduncle a little longer than penultimate, flagellum shorter than peduncle, in S 8-, in © 6-jointed. Maxillipeds, inner plates with outermost of the 3 apical spine-teeth large, outer plates smaller than inner, armed with fine setae, 4% joint of palp with a long apical seta. Gnathopod 1, 5tR joint as long as 6%, hind margin fringed with about 15 long setae, 6! subreetangular, widening distally, palm nearly transverse, well defined by a projection of hind margin. Gnathopod 2 in CO, 34, 4th and 5th joints small, subequal, 5!" not lobed, squared, 6! very large, oblong, slightly widened distally, palm slightly convex, very little oblique, defined by a process of hind margin, finger stout, inner margin slightly projeeting near base. Gmnathopod 1 in Oo as in Cd. Gmathopod 2 in O like gnathopod 1, but 5tk joint shorter, subtriangular, with only 5 or 6 setae. Peraeopods 3—5, 24 joint very broad, hind margin very convex, minutely serrate. Uropods 1 and 2 well developed. Uropod 3 very minute, with no distinet peduncle, the single ramus pear-shaped and bearing a few minute setae, the ramus here spoken of perhaps including the pedunele. Telson subreetangular, angles rounded. Colour greyish or nearly white. L. reaching 5 mm. New Zealand. Mountain streams up to about 457 m; and at 731 m. * 556 Parhyale, Neobule 8. Gen. Parhyale Stebb. 1897 Parhyale (Sp. un.: P. fasciger), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.26. : Distinguished from Hyale (p. 559) only by the uropod 3, which has a minute inner ramus. 1 species. 1. P. fascigera Stebb. 1897 P. fasciger, T. Stebbing in: Tr. Linn. Soc. London, ser.2 ©.7 p.26 t.6. Side-plates 1—4 well developed, 1% widened below, 4!" slichtly bi-emarginate behind. Pleon segment 3, postero-lateral corners quadrate. Eyes large, oval, dark, obliquely approximate. Antenna 1, 1° joint fully as long as 24 and 34 combined, flagellum longer than peduncle, 10- or 11-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal, flagellum not greatly longer than peduncle, in JS 20-, in 0 14—16-jointed. Maxillipeds, 24 and 34 joints of palp distally widened, 34 in J having a dense fasciele of setae at outer apex. Gmathopod 1 in C, 5tk joint with broad, fringed distal lobe, 6th as’broad and long as 5tP, oblong, with row of spines on distal half of hind margin, palm rather oblique, well defined, finger stout, inner margin with small setules, the tip acute, passing 2 stout palmar spines. Gmathopod 1 in O, 6% joint less broad than 5t", finger .not so stout as in C, Gnathopod 2 in C, 6th joint massive, oblong, hind margin with little sub- distal group of spinules, palm very oblique, spinulose, convex, ending in a small pocket with palmar spines, receiving apex of long and broad, well curved finger. Gnathopod 2 in O, 6!" joint less massive, palm still more oblique, leaving a very short hind margin, which is fringed with spines; marsupial plates long, distally acute and closely fringed with rather short setae. Peraeopods 1—5 not elongate, the spines not large, finger short, with strong inner setule.. Peraeopods 3—5, 24 joint well expanded, hind margin not strongly serrate. Uropods 1 and 2, outer ramus without marginal spines. Uropod 3 short, peduncle not as long as telson, outer ramus a little shorter than pedunele, inner ramus conical, tipped with a very short seta. Telson divided to the base, the lobes oblong or subtriangular, almost vertieally placed. L. about 7 mm. Caribbean Sea (St. Thomas, harbour; Antigua). 9, Gen. Neobule Hasw., 1879 Neobule (Sp. un.: N. algicola), Haswell in: P. Linn. Soc. N. S. Wales, v.4 p. 255 | 1880 Neobula, J. V. Carus in: Zool. Anz., ©.3 p. 291. Maxillipeds, inner plates developed, but not outer. Gnathopod 2 larger than gnathopod 1, both subchelate. Uropod 3 biramous. Telson squamiform. 1 accepted and 2 doubtful species. 1. N. gaimardii (M.-E.) 1840 Amphitoe g., H. Milne Edwards, Hist. nat. Urust., ©.8 p.87 | 1879 Neobule algieola, Haswell in: P. Linn. Soe. N. S. Wales, v.4 p-255 t.8 f.4 | 1885 N. (Hyale?) a., Haswell in: P. Linn. Soc. N. S. Wales, v. 10 p.96 t.11 £.4—6 | 1893 N. (H.?) a., A. Della Valle in: F. Fl. Neapel, v.20 p. 897. Side-plates large, especially side-plate 4. Eyes round. Antennae 1 ‚ and 2 equal. Antenna 1, 1° joint longer and stouter than the others, in en ee sul m he Der 2 ee Neobule, Parorchestia 557 39 very short, flagellum rather longer than peduncle, about 11-jointed. Antenna 2, ultimate joint of pedunele longer than penultimate, flagellum subequal to pedunele, 11-jointed. Gnathopod 1, 5th joint triangular, subequal to the oblong 6%, palm transverse, slightly concave, finger matching palm. Gnathopod 2, 5% joint distally expanded into a broad, somewhat produced lobe, 6! broadly oblong, palm straight, transverse. Peraeopod 5 longer than peraeopod 4, 2° joint broader than in preceding peraeopods. Uropod 3. rami extremely short (not figured by Haswell). L. about 6 mm. South-Paeifie (New Holland; Kiama [New South Wales]. Among sea-weed between tide-marks. N. armorica (M.-E.) 1830 Amphithoe a., H. Milne Edwards in: Ann. Sci. nat., v.20 p.378 | 1862 Amphithoö a., Nicea (part.)?, Bate, Cat. Amphip. Brit. Mus., p. 243 | 1893 Amphithoe a., A. Della Valle in: F. Fl. Neapel, v.20 p. 424. Uropod 3 short. ending in 2 conical appendages much shorter than peduncle. Brittany. N. reynaudii (M.-E.) 1830 Amphithoe r., H. Milne Edwards in: Ann. Sei. nat., v.20 p.378 | 1862 Amphithoe r., Bate, Cat. Amphip. Brit. Mus., p. 243 | 1893 Amphithoe rubricata (part.), A. Della Valle in: F. Fl. Neapel, ©.20 p. 459. Cape of Good Hope. 10. Gen. Parorchestia Stebb. 1899 Parorchestia, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.402. Like Orchestia (p. 530), but maxillipeds with 4" joint of palp distinet, though very small, eonical and having a spine on the truncate apex. 3 species. Synopsis of species: 1 | Antenna 1, 34 joint shorter than 24... .... 1. P.tenuis. . . . p.557 Antenna 1, 3d joint longer than 24 — 2. 9 | Antenna 1, joints of flagellum unusually elongate . 2. P. hawaiensis . p.558 Antenna 1, joints of fagellum not unusually elongate 3. P. sylvieola . . p.558 1. P.tenuis (Dana) 1852 Orchestia t., J. D. Dana in: P. Amer. Ac., v.2 p.202| 1853&55 O. t., J. D. Dana in: U.S. expl. Exp., u. 13u p.872; t.59 f.1 | 1862 O.t., Bate, Cat. Amphip. Brit. Mus., p.29 t.4 f.10 | 1899 O. £., Parorchestia (part.), T. Stebbing in: Tr. Linn, Soe. London, ser.2 v.7 p.402 | 1881 O. sylvicola (err., non J. D. Dana 18521), G. M. Thomson in: Tr. N. Zealand Inst., v.13 p.212 t.7 f.4 | 1884 Allorchestes recens, &. M. Thomson in: Tr. N. Zealand Inst., v.16 p.235 t.13 £.2—5 | 1886 A.r., G.M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.145 | 1888 A. r., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1639 | 1898 Orchestia gammarellus (part.), A. Della Valle in: F. Fl. Neapel, e.20 p.501. RR Body compressed. Side-plate 1 less broad than any of side-plates 2—5; side-plates 2—4 excavate behind, 5tk shallower than 4. Pleon segment 3, postero-lateral corners quadrate, a little produced acutely.. Eyes small, roundish, dark, scarcely their width apart. Antenna 1, 3% joint of pedunele not so long as 24, flagellum subequal to peduncle, 5- or 6-jointed. Antenna 2 half as long as body (Dana) or less; ultimate joint of pedunele a little longer than penultimate, flagellum rather longer than peduncle, 8—14-jointed. Upper lip apically broadly rounded. Maxilla 1, palp minute. Gnathopod 1 in C small, compact, 4" joint having on hind margin an apical scabrous boss, 5tk with free part of hind margin broadly produced, scabrous, 6tk shorter 558 Parorchestia than 5tk, widening distally into a scabrous boss, so that the finger does not reach the end of the apical border but only that of the true palm, which is transverse and setulose. Gmathopod 2 in J, 24 joint slightly widened distally, 5th small, triangular, masked by 4%; 6th Jarge, with the closed finger forming a broad oval, palm rather oblique, nearly straight, with slight sinuosities, fringed with spines, well defined but not by a tooth. Gnathopod 1 in oO, expansions of 4 and 5tk joints smaller than in J, 6tk narrow at base, then rather wide, almost evenly oblong and smoothly margined to the palm, which is nearly straight and transverse, with a finger reaching exactly to the end of it and of the apical margin. Gnathopod 2 in Q, 24 joint not expanded, 4 and 5tk resembling those of gnathopod 1 in JS, though a little less robust, 6! nearly as long as 5tt, hind margin straight, produced in a narrowly rounded lobe a little beyond the short, stout, acute finger and the small, excavate, oblique palm. Peraeopods 1—5 rather short and compact, finger small. Peraeopods 3—5, 24 joint well expanded, as broad below as above. Branchial vesicles oval. Pleopods 1—3, rami as long as peduncle. Uropods 1 and 2 not elongate, outer ramus without marginal spines. Uropod 3 small, ramus slender, rather shorter than peduncle. Telson rather longer than broad, proximally squared, then narrowing to entire apex with groups of spinules.. L. about 12 mm. New Zealand. Among roots of grasses and in a small stream. 2. P. hawaiensis (Dana) 1853 & 55 Orchestia h.; J. D. Dana in: U. S. expl. Exp., v.13u p.880; t.59 £.8 | 1862 O.h., Bate, Cat. Amphip. Brit. Mus., p.32 t.5 £.7 | 1893 O.? h., A. Della Valle in: F. Fl. Neapel, v.20 p.509 | 1899 O.h., Parorchestia (part.), T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p. 402. Side-plates rather large, 5!" almost as deep as 4". Pleon segments 1—3 with no hairs, setae, or notches on the lateral margin. Eyes nearly round. Antenna 1 reaching nearly end of ultimate joint of peduncle of antenna 2, 34 joint as long as 1° and 24 combined, flagellum with 7 joints which are full 4 times as long as broad. Antenna 2 rather more than half as long as body, peduncle rather long, flagellum longer than peduncle, with 17 or 18 joints, which are more than twice as long. as broad. Gnathopod 1 in O, 6% joint oblong, but narrower at apex, and not properly truncate, finger a little longer than the width of the joint. Gmathopod 2 in Q, 4 joint gibbous and finely scabrous below, 6!" not much shorter than 5tk, with distal expansion not very broad, the minute finger rather obliquely placed. Peraeopods 1—5 slender, 1°? and 24 comparatively long, 39 not shorter than 24. Uropod 1, outer ramus with only apical spines, one very long. L. 16—18 mm. Tropical Paeifie (Hawaiian Islands). 3. P. sylvicola (Dana) 1852 Orchestia s., J. D. Dana in: P. Amer. Ac., v.2 p. 202 | 1853 & 55 O. s., J. D. Dana in: U. S. expl. Exp.. v. 13u p. 873; 1.59.29, £. 3 | 1862 O. s., Bate, Cat. Amphip. Brit. Mus., p.21 t.3 f.7 | 1881 O. s., G. M. Thom- son in: Tr. N. Zealand Inst., v.13 p.208 t.7 f.4 | 1886 O.s., G. M. Thomson & Chilton in: Tr. N. Zealand Inst., «.18 p.145 | 1893 O.s., A. Della Valle in: F. Fl. Neapel, v.20 p.510 | 1899 O.s., Parorchestia (part.), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.402. Body rather compressed. Side-plates not very large, 5th nearly as deep as 4th, Pleon segment 3, postero-lateral corners quadrate. Eyes round, rather small, dark, usually as far apart as their width. Antenna 1 reaching end of penultimate joint of peduncle of antenna 2, but sometimes much farther, 34 joint longer or much longer than 24 or 18, flagellum not shorter De DE De © anime en ABEL An ae ai. al a a ri gran ai X T 6 Bar u ae ana Fr El a Le tee EEE TE zu EINEN OIR: : RE EEE RE EN a en en Ä Parorchestia, Hyale 559 than peduncle, 8-jointed. Antenna 2 slender, penultimate joint of peduncle more than half as long as ultimate, flagellum with about 20 joints, which are longer than broad. Gmathopod 1 in J slender, 4" joint with obtuse pellueid process of hind margin, 5tk with free part of hind margin broadly produced, 6! joint not very long, with ?/, length of hind margin slightly bulging, and the small finger reaching end of palm, but not of apical border. Gnathopod 2 in J, 6th joint large, subovate, palm spinulose, very oblique, slightly convex, not defined by any tooth, with a very small excavation near the hinge, finger with a corresponding thickening, the rest of its inner margin slightly sinuous. Gnathopod lin oO, 4 joint longer than 34, 5t much longer than 6b, 6% narrowly oblong, finger a little overlapping the palm. Gnathopod 2 in O, 34 joint longer than 4th, 5th rather longer than 6%", free part of hind margin somewhat expanded, 6th elongate, produced to a narrowly rounded apex, much beyond the small finger, which is placed rather obliquely. Peraeopod 3 considerably shorter than peraeopod 4, 24 joint in both -piriform, with scarcely any free corner. Peraeopod 5 rather longer than peraeopod 4, 24 joint much wider, as broad as long, a little narrowed below, free corner rounded, distinct. Uropods 1 and 2, outer ramus with spines only at apex, in both sexes (Dana: only in d). Uropod 3, pedunele short, scarcely longer than broad, ramus triangular, much narrower than peduncle and rather shorter, with 3 spines. Telson slightly notched at apex. L. 12—16 mm. New Zealand. From moist soil in the bottom of the extinet voleano of Taiamai far from the sea, and perhaps in other parts. 11. Gen. Hyale.H. Rathke 1837 Hyale (Sp. un.: H. pontica), H. Rathke in: M&m. pres. Ac. St.-Pötersb., v.8 p.877 | 1876 H., T. Stebbing in: Ann. nat. Hist., ser.4 v.17 p.337 | 1879 H., Subgen. H., Wrzesniowski in: Zool. Anz., v.2 p.201 | 1888 H., T. Stebbing in: Rep. Voy. Challenger, v.29 p.171ete. | 1890 H., G. O. Sars, Crust. Norway, v.1 p.26 | 1893 H., A. Della Valle in: F. Fl. Neapel, v.20 p.517 | 1849 Nicea (Sp. un.: N. lucasii), H. Nicolet in: Gay, Hist. Chile, v.3 p.237 | 1849 Allorchestes (part.), J. D. Dana in: Amer. J. Sei., ser.2 v.8 p.136 | 1852 A. (part.), J. D. Dana in: P. Amer. Ac., v.2 p.205 | 1856 Galanthis (Sp. un.: @. lubbockiana) (non Gistl 1848, Mollusca!), Bate in: Rep. Brit. Ass., Meet. 25 p.57 | 1857 @., Bate in: Ann. nat. Hist., ser, 2 v.19 p. 136. Side-plate 4 much deeper than 5%, Antenna 1 longer than peduncle of antenna 2. Maxilla 1, palp 1-jointed, reaching to base of apical spines of outer plate. Maxillipeds, palp 4-jointed. Gnathopod 2 in 9 (Fig. 96 p. 565), 5" joint small, masked behind by 4. Gnathopod 2 in Q, 5 joint produced behind between 4tR and 6". Uropod 3 uniramous. Telson divided. Chiefly on coasts, also in the Sargasso Sea and on floating objects of various kinds, sometimes apparently.in the open ocean. 22 accepted and 20 doubtful species. Synopsis of accepted species: 1 H Body carinate — 2. Body not earinate — 38. 9 { Body without dorsal teeth . ... .... I B0arinata .. ... p- 561 Body with dorsal teeth.. ........ 2. H. ochotensis . . . . p.561 3 { Antenna 2 longer than the body . . . . - 3. H. campbellica . . . p.562 Antenna 2 not longer than the body — 4. 560 ou Lu 1 [e2) De} [e +) 2 _ m > mi - je} DD fr $ ver -1 zu nun. mm un, mm un, mm mm Vom mem um, mem, ‚mm mn ei mm min, jur Vmmmnmn ‚mm nme, „mm Vmmeminnn men ‚mer Vu 18 fer Neo} Hyale Gnathopod 2 in 3, hind margin of 6th joint extremely short — 5. Gnathopod 2 in 5, hind margin of 6th joint not extremely short — 11. Gnathopod 1 in J, finger strongly fureate . A. Gnathopod 1 in d, finger not strongly furcate — 6. Gnathopod 1 in 3, 6th joint with hump on front margin Gnathopod 1 in g, 6th joint with smooth front margin — 7. Gnathopod 1 in 3, 6th joint with serrulate ish at a a 6. Gnathopod 1 in 5, 6th joint without serrulate distal margin — 8. Gnathopod 2 in 3, palm densely fringed with setules — 9. Gnathopod 2 in S, palm not densely fringed with setules -— U. DIV TORMSTIB- + ee ae 2. Eyes not reniform — 10. Gnathopod 2 in S, finger not nearly as long ee a: Gnathopod 2 in G, finger nearly as long BE BMIOBE 0 De a een 9. Gnathopod 1 in G, finger with subapical SODBIFIREIOR u Ba EN 10. Gnathopod 1 in S, finger without subapical constrietion — 12. Peraeopods 4 and 5, 6tl joint with spine and setae on mid hind margin. . .... . 17. Peraeopods 4 and 5, 6th joint with smooth hind margin — 18. Antenna 2 stout — 14. Antenna 2 not stout — 17. Peraeopods 1—5, finger distinetly though mieroscopically pectinate — 15. Peraeopods 1—5, finger not distinetly pecetinate — 16. Uropod 1, marginal spines on only one of RE Tee eat 12. Uropod 1, marginal spines on both rami. . 13. Gnathopod 1 in S, 6th joint distally narrowed 14. Gnathopod 1 in 3, 6th joint distally widened 15. Peraeopods 3—5, 6th joint with a very con- spicuous serrate spine — 18, Peraeopods 3— 5, 6th joint with no exceptionally eonspicuous serrate spine — 19. Gnathopod 1 ind, 5th joint produced along 6th 16. Gnathopod 1 in d, 5th joint not produced BR OR nn 17. Peraeopods 1—5, setule on inner margin of Bager JROBE 7. een 18. Peraeopods 1—5, setule on inner margin of finger weak — 20. H. diplodaetyla . . . p.562 H. galateae .. .: . p. 563 H. maroubrae. . . . p.563 H.graminea ... . p.564 H. hirtipalma . . . . p.564 H. maerodactyla. . . p.564 3: aquiline'-- .. =, p. 565 H. prevostil. ..:..- p- 565 H. grandicornis . . . p. 566 H. novaezealandiae . p.567 H. grimaldi. . . . . p.567 H. crassicornis . . . p.568 E. pontioe 1.50% p: 568 BU media ;2., + 55% p- 569 H.perleri. :; : ..,. p. 570 a llarlun 5e ET ee an, PETER PN eh ac te u nen EN r x AE el ö Hyale 561 ODER a ee 19. H. camptonyx. . . . p.570 Maxillipeds in 3, setule at tip of finger not Maxillipeds in 5, finger tipped with very „| very long — 21. Gnathopod 1 in d, 6th joint not twice as 91 en ER EUER 20. H. schmidti . . . . p.571 Gnathopod 1 in S, 6th joint twice as long as broad — 22. Gnathopod 2 in d, palm shorter than hind PR) on 2 > Bi ER p. 571 Gnathopod 2 in d, palm not shorter than RE AR EI EERS ET: 22. u rabie. ee. p. 572 1. H. carinata (Bate) 1862 Allorchestes carinatus, Bate, Cat. Amphip. Brit. Mus., p.87 t.6 f.2 (3 juv.?) | 1866 Nicea longicornis (non Orchestia I. Kreyer 1845)), E. Grube in: Arch. Naturg., v.821 p.388 | 1866 N. crassipes, Cam. Heller in: Denk, Ak. Wien, v.26ır p.12 t.1 f.34, 35 (S juv.?) | 1893 Hyale pontica (part.: juv.)?, A. Deila Valle in: F. Fl. Neapel, v.20 p. 528. Peraeon segments 1—6 dorsally rounded, not broadly, peraeon segment 7 and pleon segments 1—3 slightly carinate. Side-plates I—4 rather large, 1°: widening, 24 narrowing distally. Pleon segment 3, postero-lateral corners quadrate, with slight projeeting point. Eyes small, subrotund, wider than their diameter apart. Antenna 1 stouter than antenna 2 and not shorter, 18t joint stout, as long as 24 and 34 combined, flagellum 11-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal in length, neither of them as long or nearly as stout as 1° of antenna 1, flagellum 12-jointed. In the young taken from mother’s pouch antenna 1 decidedly longer than antenna 2, flagellum 3-jointed, antenna 2, flagellum 2-jointed. Lower lip, prineipal lobes distally narrowed, divergent. Maxillipeds, apical spine of palp longer than the conical 4 joint. Gnathopod 1 in J', 6 jointsmall, elongate quadrangular, hind margin almost straight, with a setose indent near middle, palm nearly trans- verse, the slightly curved finger matching it (Heller). Gnathopod 2 in Ö, öfh joint not produced between 4 and 6th, 6tk broad, somewhat oval, palm oblique, about equal to the nearly straight hind margin, defined from it by a blunt angle, finger slightly curved (Heller). Gmathopod 1 in Oo, 24 joint narrow, reaching end of side-plate, 5tk not lobed, scarcely as long as the narrow oblong 6, of which the hind margin is fringed with spines, palm convex, not at all oblique, finger longer than palm. Gnathopod 2 in oO with narrow branchial vesicle, and long broad marsupial plate fringed with long setae, the limb almost exactly like that of gnathopod 1, 24 joint slightly larger, 5% rather broader, 6 rather longer (Grube). Peraeopods 1 and 2 rather slender. Peraeopods 3—5 rather robust, 24 joint with hind margin faintly erenulate, in peraeopods 3 and 4 this joint oblong, a little wider above than below, 4 joint expanded to twice width of Stk; in peraeopod 5 24 joint with convex front margin, hinder expansion giving it a eircular appearance, the expansion produced below the 34 joint, 4!h less expanded than in the 2 preceding peraeopods; finger in all peraeopods stout and eurved. Uropods 1—3 short. Telson short, broad, each half nearly as broad at base as the length, apex also broad. L. Q reaching 6, d reaching 8 mm. Mediterranean (Italy, Messina); Adriatie. 2. H. ochotensis (F. Brandt) 1851 Allorchestes o., F. Brandt in: Middendorff, Reise Sibirien, ». 21 p. 143 t.6 f.27a—f | 1893 A. o., A. Della Valle in: F. Fl. Neapel, v.20 p.528 | 1888 Hyale o., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 247. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 36 562 Hyale Body at centre moderately, behind very strongly compressed, in the last °/, having a earina gradually encreasing in strength, peraeon segments 6 and 7 each with small dorsal tooth, pleon segments 1—4 each with a strong one. Side-plates 1—5 rather large. Pleon segment 3, postero-lateral corners seemingly obtusely quadrate. Eyes rather small, almost reniform, black. Antenna 1 very little shorter than antenna 2, which are about half as long as body, both antennae sparingly armed, with flagellum longer than peduncle. Gnathopod 1, 5th joint short, distally wider than 6th, 6th elongate oval, palm oblique, ill-defined, finger bent. Gmathopod 2, 5tk joint distally narrower than 6th, 6tk somewhat similar in shape to that of gnathopod 1 but much larger, elongate-rhomboidal. Peraeopod 3, 24 joint. rather small, almost eircular. Peraeopod 4, 24 joint rounded quadrate. Peraeopod 5, 24 joint with expansion large, rounded behind, below produced into a triangular lobe. Uropod 3, ramus narrow, spinose, as long as peduncle. Telson with a spinule on each of the short, rounded rhomboidal, apically thickened lobes. L. reaching 29 mm. Sea of Ochotsk. 3. H. campbellica (Filh.) 1885 Allorchestes e., Filhol in: Recu. Passage Vönus, v.311 Zool. p. 466. Eyes small, round. Antenna 1 reaching base of flagellum of antenna 2, which is a little longer than the body. Gmathopod 1, 5tk and 6th joints equal in length. Gnathopod 2, 6!" joint robust, oval, a little compressed laterally, finger hooked, the part of the hand to which it is applied showing on the inner face a series of minute denticulations; 5tk joint without produced process („spine*). Peraeopods 3—5 have very fine setae at the apices of their joints; hind margin of 4tk joint dentieulate. L. 8 mm. South-Pacific (shore of Perseverance Bay [Campbell Island]). 4. H. diplodactyla Stebb. 1899 H. diplodactylus, T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.403 t.310. Side-plates 1 and 2 not very deep, 1° little widened below. Eyes rounded, light-coloured in spirit. Antenna 1 much longer than peduncle of antenna 2, pedunele short, its joints suecessively much shorter, flagellum in d 14-, in © 9-jointed. Antenna 2, ultimate joint of peduncle longer than penultimate, flagellum in J 26-, in 17-jointed. Gnathopod 1 in J (Fig. 95), 24 joint short, distal part wide, 4th distally squared, Se supporting fringed hind lobe of 5tk, this lobe Joint projeeting beyond a short straight piece of the Rear 6% joint? hind margin, 6% joint widening greatly to the palm, hind margin sinuous, much shorter than smoothly eurved front, palm long, not very Pig, @. au NIRENSENERR. MI: oblique, excavate, ending in a wide pocket, which ai receives the deeply furcate end of finger, which is thus wider distally than at its base. Gmathopod 2 in C scarcely differing from that of H. galateae, except that the expanded front margin of the 24 joint is closely fringed with setules, and the 6'k is widest near to the base instead of at junetion of hind margin with the long very oblique palm. In other respects © and d appear to agree with H. galateae. Telson rather markedly upturned, with a slight twist to the rounded apex of each triangular lobe. L. about 5 mm. Caribbean Sea (St. Croix). Hyale 563 5. H. galateae Stebb. 1899 H.g., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 2.7 p.402 t.31B. Body and to some extent the appendages scabrous with little hairs or scales like an inverted T (in Pacific, but not in Atlantic speeimens). Side-plate 1 widened distally, 24 and 34 not very deep. Pleon segment 3, postero-lateral corners quadrate. Eyes large, oval, nearly meeting at the top of heäd, black. Antenna 1 much longer than peduncle of antenna 2, joints of peduncle small, successively shorter, flagellum in S with 9 or 10, in © with 7 distally widened joints. Antenna 2 about '/, as long as body, ultimate joint of peduncle considerably longer than penultimate, flagellum in C 12-, in Q 9-jointed. Maxilla 1, palp with a small constrietion. Maxilli- peds, 4th joint of palp slender, curved. Gnathopod 1 in J, 24 joint short and broad, 4 apically squared, 5tk nearly as broad as long, forming a rounded lobe behind, with spines along the somewhat flattened hind margin, 6th rhomboidal, the long front margin having a slight hump at the centre, the hind margin much shorter, making an angle at the widest part of the joint before joining the oblique, spinuliferous palm, from which it is defined by a palmar spine, which is overlapped by the curved finger. Gnathopod 2 in Cd, 24 and 34 joints distally lobed in front, 4! with broadly rounded apex, 5tk very short, with the little horny-looking process from the hind margin on either side more conspicuous than usual, 6!" large, widest where the short, smoothly curved hind margin meets the long, very oblique, nearly straight, spinulose palm, narrowest at hinge of the long, curved finger, which has a strong bulb at base of inner margin. Gnathopods 1 and 2 in © small, 5th joint short, 6tk oblong, slightly widened at rather oblique, spinulose palm, gnathopod 2 rather the larger. Peraeopods 1—5 moderately robust, finger with minute inner setule; the oval 24 joint in peraeopods 3—5 nearly smooth behind, its wing in peraeopod 5 broadly rounded and somewhat produced downward. Uropods 1 and 2 with lateral spines on both rami, in uropod 2 rami rather stout, unequal. Uropod 3, ramus rather shorter than peduncle. Telson with distal half of each lobe triangular. L. 4 mm. Paeifie (lat. 88° N., long. 180° E.; lat.5°N., 137° E.); North-Atlantie (Sargasso Sea; lat. 26° N., long. 59° W.). 6. H. maroubrae Stebb. 1899 H.m., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.405 t.32C. Body rather compressed. Pleon segment 3 with postero-lateral corners quadrate. Eyes rounded, about the diameter apart, darkish. Antenna 1, peduncle short, 1° joint as long as 24 and 34 combined, flagellum of 9 slender joints. Antenna 2 about half as long as body, flagellum longer than peduncle, slender, 19-jointed. Gnathopod 1 in JS, 4tk, 5th and 6th joints subequal in length, 6'% oblong, scarcely longer than wide, hind margin from near base fringed with spinules, which distally meet a transverse row of smaller spinules, across which the short finger closes, as if along a palm, but half the distal margin of the 6!" joint extends beyond these in a micro- scopically dentieulate lobe at right angles to the hind margin though the junction is rounded off. Gnathopod 2 in S, 5tk joint very small, triangular, 6! very large, broadest proximally, hind margin very short, spine-fringed palm very oblique and long, well defined, the long finger nearly reaching the 4b joint, its apex passing on inner side of palmar spine into a pocket on surface of the joint. Branchial vesicles very small. Peraeopods 1—5 having on 6!" joint a distal, blunt-headed, partially serrate spine, and between 36* 564 Hyale this and the finger a spine upbent towards the other, of a peculiar fusiform shape. 'The setule on inner margin of finger very small. Uropod 3, ramus moderately slender, as long as peduncle, each with apical spines only. es with lobes distally somewhat acutely triangular. L. 5 mm. Maroubra Bay near Sydney [East-Australia]. 7. H. graminea (Dana) 1852 Allorchestes? g., J. D. Dana in: P. Amer. Ac., v.2 p.208 | 1853 &55 A.? g., J. D. Dana in: U.S. expl. Exp., v. 13m p.897; t.61 f.5a—b | 1862 A. gramineus, Bate, Cat. Amphip. Brit. Mus., p.46 t.7 f.8 | 1893 Hyale. prevostiü (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Eyes reniform. Antenna 1 ?/, as long as antenna 2, flagellum slender, longer than peduncle, about 14-jointed. Antenna 2 less than half as long as body, flagellum stout, much longer than peduncle, joints hardly oblong. Gnathopod 1, 6'k joint narrow, slightly broadest at middle, finger long, stout, folding against hind’ margin. Gmnathopod 2, 6% joint large, narrowly ovate, narrow at finger-hinge, palm setulose, very oblique, not at all convex, scarcely defined from the very short hind margin. Peraeopods 1-—5 feebly armed. Colour tints of green and yellow, hind legs partly carmine. L. 12—14 mm. Tropical Atlantie (Rio Janeiro). 8. H. hirtipalma (Dana) 1852 Allorchestes h., J. D. Dana in: P. Amer. Ac., v.2 p.205 | 1853 & 55 A.h., J. D. Dana in: U. S. expl. Exp., v. 1311 p.888; t.60 f.4 | 1879 Hyale (A.) h., Wrzesniowski in: Zool. Anz., v.2 p.200 | 1862 A. inca, Bate, Cat. Amphip. Brit. Mus., p.40 t.6 f.7 | 1879 Nicea fimbriata, G. M. Thomson in: Tr. N. Zealand Inst., v.11 p.236 t.10B f.2 | 1886 N. f., G.M. Thomson & Chilton in: Tr,N. Zealand Inst., v. 18 p.144 | 1888 Hyale f. + H. hirtipalma, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1705 | 1895 H. f., G. M. Thomson in: Tr. N. Zealand Inst., v.27 p.211 | 1893 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Eyes dark, rather small, subrotund. Antenna 1 half or more than half as long as antenna 2, proportionately longer in small specimens, joints of peduncle subequal, flagellum much longer than pedunecle, 13—15-jointed. Antenna 2 less than half as long as body, ultimate joint of peduncle a little longer than penultimate, with a brush of setules on lower margin, flagellum longer than peduncle, with 17—22 joints, each with brush of setules. Maxilli- peds, 4 joint of palp short, slender, acute. Gmathopod 1, 5!" joint rather short and broad, 6!" widening to the palm, which is longer and more oblique in a large specimen than in a small, setulose, with palmar spines (stout teeth, Thomson), finger fringed within with tiny setules.. Gmnathopod 2, 5th joint small, 6 very large, subovate, narrowing to finger-binge, palm very oblique, densely fringed with setules, finger not nearly as long as 6% joint. Peraeopods 1—5 all rather long, 5! and 6th joints without spines on convex margin, finger rather short and stout, curved, acute. Peraeopods 3—5, 24 joint well expanded. Uropods 1—3 not very long. Uropods 1 and 2, outer ramus rather the shorter. Uropod 3, ramus subequal to peduncle. Telson eleft almost to the base. Colour pale yellow. L. reaching 20 mm. Pacifie (Valparaiso; Island of San Lorenzo [Peru]; Dunedin [New Zealand] ; Macquarie Island). 9. H. macrodactyla Stebb. 1899 H. macrodactylus, T. Stebbing in: Tr. Linn. Soe. London, ser.2 ©%.7 p.404 t.81D. Side-plates not deep, 1° distally widened, 4! wide, with deep hind emargination. Pleon segment 3, postero-lateral corners quadrate, scarcely produced. Eyes not large, rounded, wider than diameter apart. Antenna l, Ba SE a neh, 2 al ee re De Hyale 565 pedunele short, 1% joint subequal to 24 and 34 combined, flagellum with 13 joints, of which the proximal are short. Antenna 2 more than half as long as body, ultimate joint of peduncle longer than the short penultimate, flagellum 25-jointed. Gnathopod 1 in J, 24 joint short, broad except at base, 39 with small front lobe, 5th with small hind lobe, 6 oblong oval, palm oblique, spinulose, separated from hind margin by rounded angle carrying a palmar spine, against the inner side of which the apex of finger closes. Gnathopod 2 in S (Fig. 96), 24 joint lobed zes at distal end of front margin, 34 lobed in front, 5% joint rounded apex of 4tk touching the base of 6th, rein 6'h elongate, widest at base, front margin smoothly eurved, palm celosely fringed with slender spinules, extending almost whole length of joint, nearly straight, but with an emargination between two slight swellings, one of which adjoins the finger-hinge, Fig. 96. H. macrodactyla, 3. the long, blunt, slightly sinuous finger capable of RE? touching apex of 4" joint. Ina specimen, which appears to bea young J, the oblique palm is straight, finger matching it. Gnathopods 1 and 2 inQ, 6% joint narrowly oblong. Peraeopods 1—5, 6!" joint at inner apex carrying a strong blunt spine, with a similar much shorter one below it, finger curved, inner setule minute. Peraeopods 3 and 5, 24 joint somewhat orbieular. Peraeopod 4, 24 joint oblong oval, rather wider above than below. Uropods 1 and 2, both rami with lateral spines. Uropod 3, ramus as long as pedunele. Telson cleft to base, lobes bluntly triangular. L. about 4 mm. Tropical Atlantie (St. Thomas’ harbour; Rio Janeiro). 10. H. aquilina (A. Costa) 1857 Amphithoe a., A. Costa in: Mem. Acc. Napoli, v.1 p.202 t.2 f.7 | 1895 Hyale a., A. Della Valle in: F. Fl. Neapel, v.20 p.523 t.16 f. 43—47 | 1862 Allorchestes pereiri (part.), Bate, Cat. Amphip. Brit. Mus., p.42 | 1866 Nicea fasciculata, Cam. Heller in: Denk. Ak. Wien, ©.26u p.6 t.1 f.10—12 | 1879 'Hyale f., Wrzesniowski in: Zool. Anz., v.2 p.202 | 1888 H. gazella (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 297. Side-plate 1 broader than deep. Antennal half as long as antenna 2 or a . little more, flagellum twice as long as peduncle, 15- or 16-jointed. Antenna 2 about °/, as long as body or a little less, ultimate joint of pedunele rather longer than penultimate, flagellum fully twice as long as peduncle, 30—32- jointed. Maxillipeds, 34 joint of palp setose, 4! acute. Gmathopod 1 in CS small, 5tt and 6tk joints subequal or 5% joint a little longer, 6!" subrotund, about as broad as long, palm a little sinuous, spinose, almost transverse, finger compressed, laminar, dilated from the base towards the apex, which is constrieted, ending in a curved point, produeing resemblance to a hawk’s bill. Gnathopod 2 in J robust, oblong oval, palm oblique, not strongly defined (Heller: with a small defining tuberele). Gmnathopods 1 and 2 in © similar, but 6% joint rather stouter in gnathopod 2; both gnathopods having 5t% joint triangular, shorter than oblong 6%, finger slender, curved. Uropod 3, ramus shorter than peduncle. Telson small, lobes conical. L. 8 mm. Mediterranean; Adriatie. 11. H. prevostii (M.-E.) 1830 Amphithoe p., H. Milne Edwards in: Ann. Sei. nat., v.20 p.378 | 1862 Nicea p., Bate, Cat. Amphip. Brit. Mus., p. 53 | 1866 Allorchestes prevosti, E. Grube in: Arch. Naturg., v. 821 p.386 | 1888 Hyale prevostii, T. Stebbing in: Rep. Voy. Challenger, v.29 p.144 | 1893 H.p. (part.), A. Della Valle in: F. Fl. 566 Hyale Neapel, v.20 p.519 t.2 £.6; t.16 f. 23—42 | 1843 Amphithoe p., A. nilssonü, H. Rathıke in: N. Acta Ac. Leop., 9.201 p.81 t.4 £.5a—ex; p.264 | 1861 Allorchestes n., Bate & Westwood, Brit. sess. Crust., ©.1 p.40 f. | 1876 Hyale nilssoni, T. Stebbing in: Ann. nat. Hist., ser. 4 v.17 p.337 t.18 f.1a—h | 1890 H.n., G. O. Sars, Crust. Norway, v.1 p.26 t.ı1l f£.1 | 1887 H. nilsoni (part.) + H.n. var. minor, Chevreux in: Bull. Soc. zool. France, v.12 p.298, 294 | 1888 H.n. + H.n. var. major, Chevreux in: Bull. Soe. zool. France, v.13 p.32 | 1893 H. n., Chevreux & E. L. Bouvier in: Ann. Sei. nat., ser. 7 v.15 p. 111 | 1845 Orchestia nidrosiensis, Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.299 | 1857 Allorchestes danai, Bate in: Ann. nat. Hist., ser.2 o.19 p. 136. Back smooth. Side-plates with lower margin smooth, side-plate 1 widened below. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes small, round, black; (large, oval in var. major). Antenna 1 in O nearly as long as antenna 2, flagellum 6-jointed, in JS flagellum sometimes with 10 joints, reaching considerably beyond peduncle of antenna 2. Antenna 2 in J, flagellum 15-jointed. Gmnathopod 1 in JS, 5% joint distally some- what widened, not produced along hind margin of 6'h, 6th oblong, hind margin with spinules from the base to a submedian spine, palm slightly oblique, rounded off. Gnathopod 2 in JS, 7*b joint robust, broadest proximally, front margin very convex, bind margin with various spinules but no conspieuous notch, palm rather oblique, somewhat sinuous, well defined, finger elosing between two rows of spines to the terminal cavity of the palm, which is armed with minute spines. Gnathopod 1 in 2 nearly as in d. Gmathopod 2 in 9 like gnathopod 1, but rather larger, 5t% joint more expanded distally. Peraeopods 1—5 with numerous spines and setae, but none of exceptional size, the 6% joint having besides others an apical and a subapical one minutely hooked at tip and opposable to the strong eurved finger. Peraeopods 3—5, 24 joint expanded with smooth hind margin. Peraeopods 4 and 5, 6! joint with group of setae and spine at middle of hind margin. Uropods 1 and 2, rami short, with marginal and strong apical spines. Uropod 3 small, ramus much shorter than peduncle. Telson divided into 2 obtuse lobes with their surfaces adjacent. Colour green with metallic lustre. L. 6—8 mm (almost double in var. major). North-Atlantie and adjoining seas (Europe; Azores). In sea-weed between the high-water marks respectively of neap- and spring-tides; var. major at low-tide. 12. H. grandicornis (Kroyer) 1845 Orchestia g., O. longicornis, Kroyer in: Naturh. Tidsskr., ser.2 v1 p.292; t.1 f.2a—n | 1851 Allorchestes g., F. Brandt in: Bull. phys.-math. Ac. St.-Petersb., ».9 p. 142 | 1888 Hyaleg., T. Stebbing in: Rep. Voy. Challenger, v.29 p.210 | 1849 Nicea lucasii, H. Nicolet in: Gay, Hist. Chile, v.3 p. 238; Crust. t.2 f£.7 | 1852 Allorchestes vertieillata + A. peruviana, J. D. Dana in: P. Amer. Ac,, v.2 p.205, 206 | 1862 A.vertieillatus, A. verticellatus, Bate, Cat. Amphip. Brit. Mus., p.43 t.7 £.1 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Side-plate 1 somewhat produced forward, front margin faintly concave, angle broadly rounded (in Nicolet’s figure subacute). Pleon segment 3, postero-lateral corners quadrate, but not acutely so. Eyes rather large, dark, subrotund, sometimes approximate at top of the head. Antenna 1 about '/, as long as body, more than half as long as antenna 2, joints of peduncle successively shorter, flagellum much longer than peduncle, 12-jointed. An- tenna 2 about '/, as long as body, with small but discernible gland-cone, ultimate joint of peduncle a little longer than penultimate, flagellum longer than pedunele, longer and stouter than flagellum of antenna 1, but some- times with only 12 joints. Upper lip, distal margin almost straight truncate, with rounded corners. Maxillipeds, 4 joint of palp a slender pointed setuliferous finger. Gnathopod 1 in C, 24 jeint narrow at base, thence to r nie tr I it u rn ra a FE er er. “ Hyale 567 the middle greatly widening, 5!" joint sending out a lobe behind, fringed with spinules and not reaching the apex,. but resting in the concave distal margin of the 4" joint; 6th narrowly oblong, with spinuliferous indent near apex of hind margin, palm convex, slightly oblique, a little overlapped by finger. Gmathopod 2 in G, 24 joint not broad, 4 rather produced behind, and helping the small obscure 5th to form a eup for heart-shaped base of the large oval 6% joint, of which the spinose palm is oblique, nearly straight, ending in a pocket, where it meets the short hind margin, which ends in a sort of double tuberele carrying 2 palmar spines; the finger powerful, its apex elosing into the pocket. Gnathopods 1 and 2 in Q resembling one an- other and gnathopod 1 in JS; gnathopod 2 rather the larger. Peraeopod 3 stouter but not longer than peraeopods 1 and 2; peraeopod 4 rather stronger tban peraeopod 5; 24 joint in peraeopods 3—5 oblong oval, more rounded in peraeopod 3, widest in peraeopod 5 with somewhat angular hind margin, in. peraeopod 4 hind margin closely fringed with small spinules; 4 joint having tufts of spines on hind margin in all 3 peraeopods. In peraeopods 1—5 finger strong, curved, concave margin mieroscopically peetinate, teeth larger towards the nail. Pleopod 1, rami longer than peduncle, 15- or 16-jointed. Uropod 1, peduncle rather longer than rami, with a strong apical spine, outer ramus with only apical spines. Uropod 2, peduncle rather shorter than rami. Uropod 3, ramus apically truncate, shorter than peduncle. Telson cleft to the base, each lobe triangular from centre to apex, inner margin straight. Colour green to greyish or brownish. L. 8—12 mm. _South-Paeifie (Valparaiso). 13. H. novaezealandiae (G. M. Thoms.) 1879 Nicea n., G. M. Thomson in: Tr. N. Zealand Inst., v. 11 p.285 t.10» f.1a—f | 1888 Hyale n., T. Stebbing in: Rep. Voy. Challenger, v.29 p.500 | 1895 H.n., 6. M. Thomson in: Tr. N. Zealand Inst., 0.27 p. 211 | 1886 Nicea neo-zelanieca, G. M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.144 | 1898 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 520. Very near to H. grandicornis, but distinet in the following respeects. Gnathopod 1 in S larger, hind lobe of 5*% joint larger, more produced, apical, 6% joint broader. Gmathopod 2 in S, 24 joint distally a little widened and lobed. Peraeopods 3—5, 4% joint having the spines along hind margin solitary, not grouped. Peraeopod 4, 24 joint nearer to the rounded form in 24 joint of peraeopods 3 and 5, its hind margin also almost smooth and not spinulose. Peraeopods 1—5, microscopical pectination of concave margin of finger more faint, the customary setule stronger, than in H. grandicornis. Uropod 1, both rami with strong marginal spines. Colour yellowish, marbled with red. L. 12—14 mm. South-Paeifie (Otago Harbour [New Zealand], rock pools; Macquarie Island). 14. H. grimaldii Chevreux 1891 H. g., Chevreux in: Bull. Soc. zool. France, v.16 p.257 £.1—5 | 1895 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.889. Side-plates 1—4 deep. Pleon segment 3, postero-lateral corners quadrate. Eyes of moderate size, subrotund, black. Antenna 1, peduncle short, flagellum 9- or 10-jointed in 9, 7-jointed in ©. Antenna 2 '/, as long as body, very stout, ultimate joint of peduncle rather longer than penultimate, flagellum 17—23-jointed in C, 12-jointed in 9; the distal joints in all the flagella somewhat elongate. Gnathopod 1 in J, 5tk joint with spine-fringed lobe, 6! oblong, but a little widened at base, palm almost transverse, finger overlapping its rounded angle. Gnathopod 2 in J large, 568 Hyale 24 joint with front distal end forming a very broad rounded lobe, 34 with similar lobe, 4th pluntly pointed, completely masking the small 5th, 6th very 'broad, oblong, widest proximally, palm well defined, not very oblique, with rounded tooth near finger-hinge, finger strong. Gnathopod 1 in Q, 24 joint a little widened distally, 5t" with spine-fringed lobe, distally wider than 6th, which is rather narrowly oblong, slightly widened at palm, finger very little longer than palm. Gnathopod 2 in © like gnathopod 1, marsupial plates very long, rather broad in the middle, fringed with short setae. Peraeopods 1—5, 6! joint with spines at 5 points of inner margin, finger short, curved, inner setule minute. Peraeopods 1 and 2, 4th joint rather expanded. Peraeopods 3—5, 4 joint strongly expanded, stoutly spined on both margins, 5tk expanded distally with group of apical spines on hind margin. Peraeopods 3 and 5, 24 joint broadly oval. Peraeopod 4, 24 joint oblong, with rounded angles, hind margin almost straight. Uropod 2, outer ramus shorter and narrower than inner. Uropod 3, ramus shorter than peduncle. Telson cleft to the base, the lobes of moderate size, apically narrowed, or (Chevreux) remarkably large, apically inflated. Colour orange brown, antennae and legs violet-rose. L. about 6 mm. North-Atlantie (lat. 42° N., long. 24° W.; lat. 38° N., long. 64° W.); West- Mediterranean. On floating objects and Thhalassochelys. 15. H. crassicornis (Hasw.) 1879 Allorchestes c., Haswell in: P. Linn. Soc. N.S. Wales, 0.4 p.252 t.7 f.5 | 1885 A. c., Haswell in: P. Linn. Soc. N. S. Wales, v.10 p-95 t.10 f.2—5 | 1893 Hyale pontica (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.528. Body slender. Pleon segment 3, postero-lateral corners quadrate. Eyes oval, dark, very near together above. Antenna 1 slender, reachiug beyond peduncle of antenna 2, 24 joint rather shorter than 1%, 34 searcely shorter than 24, peduncle ?/, as long as the 11-jointed flagellum. Antenna 2 about !/, as long as body, very stout, ultimate joint of peduncle much longer than penultimate, flagellum tapering, rather longer than peduncle, with 13 joints, of which the proximal are very thick, peduncle and flagellum plumose. Gnathopod 1, 5% joint triangular, with spinules on rounded apex, 6th oblong, slightly widened distally, spinuliferous on distal half of hind margin, palm transverse, finger strong, matching palm. Gnathopod 2, 6th joint large, oblong, but with rather oblique, well defined, spinulose palm, over which the finger folds elosely, not quite reaching the end. Peraeopod 3 short, 4 and 5th subequal, spines not strong. Uropod 3 short, ramus as long as peduncle. Lobes of telson blunt. — L. about 10 mm. South-Paeifie (Kiama [New South Wales]). Between tide-marks. 16. H.pontica H. Rathke 1837 H.p., H. Rathke in: M&m. pres. Ac. St.-Petersb., v.3 p.378 t.5 f.20—28 | 1862 H.p., Bate, Cat. Amphip. Brit. Mus., p.87 t.14a £.1| 1888 H.p., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 163, 499 | 1840 Amphitoe p., H. Milne Edwards, Hist. nat. Crust., ©.8 p.37 | 1875 Nicea p., Catta in: Rev. Sci. nat., v.4 p.166 | 1856 Galanthis lubbockiana, Bate in: Rep. Brit. Ass., Meet. 25 p.57 t.17 f.7 | 1857 Allorchestes imbricatus + @.1., Bate in: Ann. nat. Hist., ser.2 v.19 p.136 | 1861 Nicea I., Bate & Westwood, Brit. sess. Orust., v.1 p.47 f. | 1876 Hyalel., T. Stebbing in: Ann. nat. Hist., ser.4 v.17 p.837 t.18 f.2,a—d | 1890 H. 1, G. 0. Sars, Crust. Norway, v.1 p.27 t.11 f.2 | 1895 H.1., A. M. Norman in: Ann. nat. Hist., ser. 6 v.15 p-479 | 1871 H. nilsoni (part.), A. Boeck in: Forh. Selsk. Christian., 1870 p.94 | 1872 & 76 H.n., H.nilssonii, A. Boeck, Skand. Arkt. Amphip., ©.1l p.109 t.3 f.3; „2 p.712 | 1879 H. imbricata, Wrzesniowski in: Zool. Anz., v.2 p. 202. et y. u N a TA Tr 2, Hyale 569 Segments of body imbricated, integument firm. Side-plates with lower margin slightly erenulate. Pleon segment 3, postero-lateral corners quadrate, but not acutely. Eyes of moderate size. Antennae l and 2 in © subequal. In S antenna 1 considerably shorter than antenna 2, but reaching much beyond pedunele of latter, flagellum longer than pedunele, with 11 joints, most of them distally widened. Antenna 2 in C, ultimate and penultimate joints of peduncle subequal, flagellum 15-jointed. Gnathopod I in CS, 5tk joint in adult strongly produced along hind margin of 6tk, 6th oblong, surface not far from base armed with a broad spine, distal part of hind margin fringed with spinules, palm transverse, rounded off but armed with a stout spine, finger matching palm. Gmathopod 2 in J, 6th joint robust, broadest proximally, front very convex, hind margin nearly straight, with small spinulose notch, palm slightly oblique, with small eavity not far from hinge, well defined, bordered with spinules and setules and having 2 palmar spines in a terminal cavity, the finger elosing down on the inner side of these spines. Ghatho- pod 1 in oO, 5t& joint distally wider than 6%, 6tk oblong, with spinules at noteh of hind margin and also at apex, palm slightly oblique. Gmathopod 2 in © similar to gnathopod 1, but larger, 5th joint more produced. Peraeo- pods 1—5 robust, 6" joint earrying a large, straight, subapical spine, serrate, tipped with a little hook, and opposable to the strongly ceurved finger; nearer the base the 6tk joint has a much smaller spine and at the apex one resembling the subapical, on a much smaller scale. Peraeopods 3—5, 24 joint broadly expanded, with erenulate hind margin, 6% joint with hind margin unarmed. Uropod 1, outer ramus rather shorter than inner, both with marginal spines. Uropod 3, ramus a little shorter than pedunele, with apical spinules. Telson divided into 2 obtuse-ended lobes, which have their surfaces adjacent. Colour bluish grey or almost black, or yellowish, or darkish green. L. 7 mm. North-Atlantie and North-Sea (England, France, West-Norway); Mediterranean (Algeria). 17. H. media (Dana) 1853 & 55 Allorchestes m., J. D. Dana in: U. S.expl. Exp., v.13m p.898; t.61 f.4a—g, I—n | 1862 A. medius, Bate, Cat. Amphip. Brit. Mus., p. 46 t.7 £.9 | 1879 Hyale (A.) media, Wrzegniowski in: Zool. Anz., v.2 p.200 | 1893 H. pontica. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 524. Side-plates 1—5 wide, not deep. Pleon segment 3, postero-lateral corners quadrate, scarcely produced. Eyes apparently variable in shape and size. Antenna 1, pedunele short, flagellum 10—14-jointed. Antenna 2, ultimate joint of pedunele rather longer than penultimate, both rather short, flagellum 16-jointed. Gnathopod 1 in C, 24 joint strongly widening from very narrow base, 5tk with rounded fringed lobe, not produced along the 6th, 6th oblong, margins parallel, hinder with median spinules, finger a little overlapping slightly oblique palm. Gnathopod 2in J, 24 joint distally widened, 34 lobed in front, 6tk large, subovate, widest before reaching the oblique well defined palm. Gnathopods 1 and 2 in © about as in H. rubra (p. 572). Peraeo- pods 1—5 robust, finger curved, inner setule minute. Peraeopods 1 and 2, 6% joint having on inner apex a stout, smooth spine, which is widest at its apex. Peraeopods 3—5 with a very large submedian serrate spine, like that which is a distinguishing feature in H. pontica, but higher up on the margin; at the apex a small spine curves towards the smooth finger. Peraeopods 3 and 5, 24 joint rotund, in peraeopod 5 very broad; peraeopod 4, 24 joint tending to oblong; in all 3 the hind margin nearly smooth, except for one pronounced indent. Pleopods with 2 short broad coupling hooks and N Be; x ar A al , 570 Hyale 3 eleft spines. Uropods 1 and 2 rather short. Uropod 3, ramus as long as peduncle. Telson eleft to base, lobes triangular. L. 6—12 mm. Atlantie (Rio Janeiro, harbour; Virgin Island St. Thomas; Cape Verde Islands; Tierra del Fuego?). 18. H. perieri (H. Luc.) 1846 Orchestia p., H. Lucas in: Expl. Algörie, p.52 t.5 f.1 | ?1866 Allorchestes p., E. Grube in: Arch. Naturg., v.321 p.382 t.9 f.2 | 1862 A. pereiri (part.), Bate, Cat. Amphip. Brit. Mus., p.42 t.6 f.10 | 1866 Nicea macronys, Cam. Heller in: Denk. Ak. Wien, v.2611 p.9 t.1 f.21—24 | 1879 Hyale m., Wrzesniowski in: Zool. Anz., ®2 p.202 | 1868 Nicea perieri + N. p. var. pontica (non Hyale pontica H. Rathke 1837!) + AN. perieri var. brevicornis, Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.116 t.8 f.26, 27 | 1875 N. prevostii (part.), Catta in: Rev. Sci. nat., v.4 p.166 | 1893 Hyale p. (part.), A. Della Valle in: F. Fl. Neapel; v.20 p. 519. Eyes oval, or reniform, black, nearly meeting at top. Antenna 1 reaching a little beyond peduncle of antenna 2, flagellum with 10 or 11 joints, all eylindrie, longer than broad. Antenna 2 half as long as body, almost completely unarmed, flagellum considerably longer than pedunele, with 16 or 17 eylindric joints, the proximal short, the following longer. Maxillipeds, 34 joint of palp feebly setose over base of finger, more strongly on inner side. Gnathopod 1, 5tk joint rather shorter than 6%, 6b oblong, hind margin with setose submedian notch, palm almost transverse, finger slightly curved, slender, acute. Gmathopod 2 in J, 4 joint rather acutely produced to touch the 6th; 6th Jarge, almost piriform, the oblique, setulose palm passing gradually without interruption into the shorter hind margin (Heller’s description, but in Heller’s figure palm well defined by a cavity and 2 palmar spines; also well defined in Lucas’ figure); finger well curved, its point closing against the inner surface. Gnathopod 2 in O, 5t% joint forming a long and thin process between 4 and 6th joints, 6 more of an oval, with shorter palm. Peraeopods 3—5 slender, 6t" joint rather long, almost straight, finger strong, apically bent, the inner setule conspieuous. Colour dull yellow. L. 95—8, S 6—15 mm. Mediterranean, Adriatie, Black Sea, tropical Atlantie (Virgin Island St. Thomas). 19. H. camptonyx (Heller) 1866 Nicea c., Cam. Heller in: Denk. Ak. Wiesn, v.2611 p.10 t.1 f. 25—80 | 1879 Hyale c., Wrzesniowski in: Zool. Anz., v.2 p.202 | 1893 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.519. Back rounded. Side-plates 1—4 moderately large, 1% slightly widened distally, 24 square. Pleon segment 3, postero-lateral corners quadrate with small produced point. Eyes small, subrotund, wider than the diameter apart. Antenna 1 reaching beyond middle of flagellum of antenna 2, peduncle short, 1 joint as long as 24 and 34 combined, flagellum long, 12—16-jointed. Antenna 2 half as long as body, ultimate joint of pedunele longer than penultimate, flagellum with 25—26 joints, the earlier'short, the distal longer. In young from mother’s pouch antenna 1 with flagellum of 3 joints, much shorter than antenna 2 with 5-jointed flagellum. Maxillipeds, 4 joimt of palp as long as 34, with apical seta m d longer than the joint. Gmatho- pod 1 in d, 24 joint rather broad except proximally, 5% shorter than 6th, distal lobe fringed with spines, 6% oblong, slightly wider at base, front margin convex, hind straight, with group of spinules at centre, finger over- lapping convex, oblique, ill-defined palm. Gnathopod 2 in d, 24 joint with distal half of front expanded, 34 forming a small lobe, 4! and 5tk very short, 6! Jarge, oblong oval, widest near base, palm spinose, somewhat oblique, defined by a blunt tooth or an abruptly transverse space from the straight hind margin, finger entering pocket at end of palm. Gmnathopod 1 Hyale 571 in 9, 24 joint narrower than in d', 6 not wider at base than distally. Gnathopod 2 in © like gnathopod 1, but 24 joint rather more expanded distally; marsupial plates long, broad, fringed with long setae. Peraeopods 1—5 rather robust, 6% joint slightly curved, concave margin spinose, convex unarmed, finger strong, ceurved, inner setule very small. Peraeopod 3, 24 joint subrotund; peraeopod 4, 24 joint oval; hind margin in these peraeopods nearly smooth. Peraeopod 5, 24 joint large, subrotund; hind margin pro- duced below 3% joint, rather strongly cerenulate. Uropods 1—3 short, ramus of uropod 3 shorter than pedunele. Telson small, each half. rather longer than breadth at base, apex blunt, narrow. L. about 6 mm. Mediterranean; Adriatic; North-Atlantie (Portugal; Azores). In sea-weed and on a floating log. 20. H. schmidtii (Heller) ?1862 Allorchestes microphthalmus, Bate, Cat. Amphip. Brit. Mus., p.39 t.6 £.6 | 1866 Nicea schmidtii, Cam. Heller in: Denk. Ak. Wien, 0.2611 ‚p-11 t.1 f.31, 32 | 1879 Hyale s., Wrzesniowski in: Zool. Anz., v.2 p.202 | 1893 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 520. Near to H. camptonyx. Antenna 1, flagellum 14- or 15-jointed. Antenna 2 ?/, as long as body, flagellum 32—40-jointed. Maxillipeds, 4th joint of palp not quite as long as 34, apical seta short. Gnathopod 1 ind, 6th joint suboval, being broader than in the other species, and the spinules on hind margin less close together, finger long. Gnathopod 2 in J, 24 joint with front margin straight, produced below into a small lobe, 34 joint with well marked front lobe, 6% joint with very oblique palm, making an angle with hind margin, but not defined by tooth or transverse space. _Peraeopods 3—5, 6% joint strong, eurved, finger long, acute, and without(?) inner setule. Peraeopod 5, 24 joint with hind margin almost smooth. Uropod 3, ramus not very much shorter than peduncle L. 7 mm. Mediterranean; Adriatie; North-Atlantie (Portugal). 21. H. nigra (Hasw.) 1879 Allorchestes niger, Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.319 | 1885 A.n., Haswell in: P. Linn. Soe. N.S. Wales, v.10 p.96 t.11 f.1—3 | 1893 Hyale (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 528. Very similar to H. camptonyx. Pleon segment 3, postero-lateral corners acutely quadrate, slightly produced. Eyes round, sometimes tending to oval. Antenna 1 reaching much beyond peduncle of antenna 2, peduncle short, 24 joint much shorter than 1%, 34 than 24, flagellum much longer than peduncle, 9—11-jointed. Antenna 2 about half as long as body, slender, flagellum very much longer than peduncle, joints in J reaching 25 in number. Gnathopod 1, 5tk joint with fringed rounded process not elasping base of 6th, 6th oblong, rather narrow, with median group of spinules on hind margin, palm short, slightly oblique. Gnathopod 2 in J, 34 joint with well developed lobe in front, 4! with apex rather acütely produced, 6 large, broadly oblong oval, palm spinulose, oblique but shorter than hind margin, well defined by a small tooth, finger fringed with setules on inner margin and having a strongly projeeting bulb at its base. Gmnathopods 1 and 2 in © small, very like one another and the gnathopod 1 in d. Peraeopods 1—5 moderately robust, not strongly armed, the broad 24 joint of peraeopod 5 with erenulate hind margin. Uropods 1 and 2 rather stout. Uropod 3 very small, the ramus very short, much shorter than the peduncle. Telson small, eleft almost to base, the lobes not very broad apically. Colour blackish purple or brown. L. 5 mm. Port Jackson [East-Australia]. Among sea-weed. 572 Hyale 22. H. rubra (G. M. Thoms.) 1879 Nicea r., G. M. Thomson in: Tr. N. Zealand Inst., ©. 11 p.236 t.10» f.3 | 1886 N. r., G.M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.144 | 1888 Hyale r., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 500 | 1893 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 520. Side-plates 1—4 rather deep. Pleon segment 3, postero-lateral corners a little outdrawn, acute. Eyes irregularly rounded. Antenna 1 half as long as antenna 2, pedunele very short, flagellum with 22 joints in J, fewer in Q, with sensory filaments in both. Antenna 2 half as long as body or more, ultimate joint of pedunele rather longer than penultimate, flagellum thrice as long as peduncle, with 40—60 joints or more in d, with 36 in 9. Gnathopod 1 in S, 5th joint with well rounded lobe of hind margin, 6t oblong with slightly convex margins, palm little oblique, finger slightly overlapping. Gnathopod 2 in C, 6tk joint very large, broadly oval, hind margin well developed, palm oblique, finger thick at base (Thomson: with 2 tubercles at the joint), elosing tightly between 2 rows of spinules. Gnathopods 1 and 2 in O alike, 6th joint rather longer in gnathopod 2, oblong, front margin slightly convex, hind margin with 1 small notch, palm a little oblique, scarcely or little overlapped by finger. Peraeopods 1—5, spines on inner margin of 6tk joint apically serrulate, encreasing in size to the antepenultimate, thence diminishing, setule on finger small. Peraeopods 4 and 5 decidedly longer than the preceding peraeopods, 24 joint in peraeopod 5 broadly ex- panded, the rounded hind margin crenulate. Uropods 1—3 and telson of the usual character. Uropods 1 and 2 with lateral spines on both rami. Colour pink. L. 8—9 mm. South-Paeifice (New Zealand). H. babirussa (A. Costa) 1857 Amphithoe b., A. Costa in: Mem. Ace. Napoli, v.1 p.201 t.2 f.5 | 1862 Allorchestes babicus (laps., corr.: babirussa), Bate, Cat. Amphip. Brit. Mus., p.50 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Bay of Naples. H. bucchichi (Heller) 1866 Nicea b., Cam. Heller in: Denk. Ak. Wien, v. 2611 p-7 t.1 f.13—15 | 1888 Hyale b., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 366, 1705 | 1893 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Maxillipeds, 4th joint of palp very short, thiekened at the base. L.92 7, & 8 mm. Adriatie (Lesina). H. gazella (A. Costa) 1857 Amphithoe g., A. Costa in: Mem. Acc. Napoli, v.1 p.202 t.2 f.6a—e | 1862 Allorchestes g., Bate, Cat. Amphip. Brit. Mus., p.50 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Bay of Naples. H. georgiana (Pfeff.) 1888 Allorchestes georgianus, Pfeffer in: Jahrb. Hamburg. Anst., 0.5 p.77 t.1 £.la—n, 4 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, ».20 p. 520. " Probably identical with H. hirtipalma (p.564). L. about 16 mm. South-Atlantie (South Georgia). At-low-tide, under stones. H. gracilis (Dana) 1852 Allorchestes g., J. D. Dana in: P. Amer. Ac., 0.2 p.205 | 1853 & 55 A.g., J. D. Dana in: U.S. expl. Exp., v.18u p.889; 1.60 f.5a—d | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Gnathopod 2, 4th joint very acutely produced behind the small 5th, L. 12—16 mm. Trepical Paeifice (Tongatabu). Shallow water among sea-weeds. DE De a | E 5 2 a a ne ar 14 wo LE 6 ER Fa ce Hyale 573 . H.hawaiensis (Dans) 1853 & 55 Allorchestes h., J. D. Dana in: U. S. expl. Exp., v.13u p. 900; t.61 f.5a—h | 1893 Hyale prevostii, (part. d 4 A. Della Valle in: F. Fl. ‚Neapel, v.20 p. 519. L. about 9 mm. Tropical Paeifie (Hawaiian Island of Maui). H. helleri (Grube) ?1864 Allorchestes imbricatus (juv.) (err., non Bate 1857!), E. Grube, Lussin, p. 72 | 1866 A. helleri, E. Grube in: Arch. Naturg., v. 321 p. 384 t.9 f.3 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 520. Approximate to the larger H. nudicornis. L. 3—5 mm. Adriatic. H. nudicornis (Heller) 1866 Nicea n., Cam. Heller in: Denk. Ak. Wien, 0.2611 p-8 t.1 £.16—19 | 1879 Hyale n., Wrzesniowski in: Zool. Anz., v.2 p.202 | 1893 H. prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Possibly identical with Parhyale faseigera (p. 556), but uropod 3 not described. Gnathopod 1 in G, . stout and strong, swollen in the middle, the point over- lapping palm. Adriatie. H. orientalis (Dana) 1853 & 55 Allorchestes o., J. D. Dana in: U.S. expl. Exp., v.13 p. 896; t.61 f.2a—h | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 519. Antenna 1, flagellum moniliform. L. about 6 mm. Sooloo Sea (off the harbour of Soung). H. piedmontensis (Bate) 1862 Allorchestes p., Bate, Cat. Amphip. Brit. Mus., p-35 t.la £.5 | 1879 Hyale (A.) p., Wrzesniowski in: Zool. Anz., v.2 p.200 | 1893 H.? p., A. Della Valle in: F. Fl. Neapel, v.20 p. 529. Perhaps young of H. prevostii (p. 565). Gnathopod 1 rather larger than gnatho- pod 2. L. under 4 mm, Coast of „Piedmont“. H. pugettensis (Dana) 1853 & 55 Allorchestes p., J. D. Dana in: U. S. expl. Exp., v.13u p.901; t.61 £.6a—d | 1857 A.p., Stimpson in: Boston J. nat. Hist., v. 6 p.518 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Puget’s Sound [North West America]. H. rudis (Heller) 1866 Nicea r., Cam. Heller in: Denk. Ak. Wien, v. 261 p.12 t.1 f£.33 | 1879 Hyale r., Wrzesniowski in: Zool. Anz., v.2 p.202 | 1893 H. prevostiü (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 520. Peraeopods 3—5, 6th joint straight, slender, finger short, with small setule on inner margin. Adriatie (Lesina). H. rupicola (Hasw.) 1879 Allorchestes r., Haswell in: P. Linn. Soe. N. S. Wales, ©.4 p.250 t.8 f.1 | 1885 A. r., Haswell in: P. Linn. Soc. N. S. Wales, v.10 p.95 t.10 f. 9—12 | 1893 Hyale r., G. M. Thomson in: P. R. Soc. Tasmania, 1892 (p.18) | 1893, A. Della Valle in: F. Fl. Neapel, v.20 p. 529. Very closely allied to H. perieri (p. 570). Peraeopods 1—5 with very conspieuous setule on inner margin of finger. L. 9 mm. South-Paeifie (Port Jackson and Botany Bay [East-Australia]; Tasmania?). 574 Hyale, Hyalella H. seminuda (Stimps.) 1857 Allorchestes s., Stimpson in: P. Calif. Ac., v.1 p. 90 | 1857 A. s., Stimpson in: Boston J. nat. Hist., 0.6 p.518 | 1898 Hyale prevostii (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 529. Bay of San Franeisco. Littoral zone. H, stebbingi Chevreux 1888 H.s., Chevreux in: Bull. Soe. zool. France, v.18- p. 32 | 1888 H.s., T. Barrois, Cat. Crust. Acores, p. 33. Probably a small variety of H. prevostii (p.565). L. $ 5 mm. North-Atlantie (Azores). E H. stewarti (Filh.) 1885 Allorchestes s., Filhol in: Bull. Soc. philom., ser.7 0.9 p.54 | 1885 A. s., Filhol in: Recu. Passage Vönus, v. 311 Zool. p. 465 t.53 f.5. L. $ 17 mm. Paterson Inlet (Stewart Island by New Zealand). H. stolzmani Wrzesn. 1879 H.s., Wrzeäniowski in: Zool. Anz., ©.2 p.201 | 1893 H.pontica (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 529. L. 2 7, 8 9 mm. Bay of Chimbote [Peru]. Under stones in small tidal pools. H. tenella (A. Costa) 1857 Amphithoe t., A. Costa in: Mem. Ace. Napoli, v.1 p- 204 t.2 f.8 | 1893 Hyale pontica (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 526. L. 5 mm. Bay of Naples. H. villosa S.I. Sm. 1876 H.v., (S. I. Smith in:) Kidder in: Bull. U.S. Mus., v.3 p.58. Closely allied to H. hirtipalma (p. 564), but gnathopod 1 with 6th joint not widening to the palm. L. nearly 10 mm. Southern Indian Ocean (Kerguelen Island). Rocky beaches. H. sp., (Hasw.) 1879 Allorchestes longicornis (non Orchestia l. Kreyer 1845!), Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.251 t.7 f.4 | 1885 A.l,, Haswell in: P. Linn. Soc. N. S. Wales, v.10 p. 95 t.10 £.6—8 | 1893, A. Della Valle in: F. Fl. Neapel, v.20 p. 528. Closely agreeing with H. camptonyx (p. 570). L. about 10 mm. South-Paeifie (Kiama [New South Wales]). Between tide-marks. 12. Gen. Hyalella S. I. Sm. 1874 Hyalella (Sp. un.: H. dentata), S. I. Smith in: Rep. U. S. Fish Comm., v.2 p. 645 | 1888 H., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 172, 433 | 1893 H., A. Della Valle in: F. Fi. Neapel, v.20 p.512 | ?1877 Lockingtonia (Sp. un.: L. flwvialis), Harford in: P. Calif. Ac., v.7 p. 58. Like Hyale (p. 559), except that maxilla 1 has a smaller palp, not reaching base of apical spines of outer plate, gnathopod 2 in 9 (Fig. 97 p. 580) has the 5t& joint produced behind between the 4! and 6tk, and the telson (Fig. 98 p. 580) is entire. Fresh water; in depths of lakes down to 120 m, and at heights above sea-level extending to 4058 m. 15 species. Synopsis of the species: 1 With dorsal teeth — 2. Without dorsal teeth — 7. Hyalella 575 Dorsal teeth only on the pleon . ....... 1, H.azteca. . . . p.575 Dorsal teeth on both peraeon and pleon — 3. Side-plates 1—4 apically aeute — 4. Side-plates 1—4 not apically acute — 5. Peraeon segments with lateral teeth .. . . . - 2. H. echinus. . . p.576 Peraeon segments without lateral teeth . . . . - 3. H.longipes . . p.576- = | Dorsal teeth large, present on all peraeon segments 4. H. lueifugax . . p. 576, 4 5 2 Dorsal teeth small, not present on peraeon seg- ments 1—4 — 6. Gnathopod 2 in S, 6th joint broader than long, palm defined by a tooth . ». » »-» 2... 5. H. latimana . . p.577 Gnathopod 2 in 3, 6th joint longer than broad, ee ee Res 6. H. longipalma . p.577 Side-plates 1—4 produced into spine-like processes 7. H. armata . . . p.577 Side-plates 1—4 not produced into spine-like pro- cesses — 8, Without aceessory branchiae (so far as known) — 9. With accessory branchiae — 11. 9 Uropod 3 nearly reaching end of uropod 2. . . 8. H.longistila . . p.577 Uropod 3 not nearly reaching end of uropod 2 — 10. 6 7 10 J Stout, with eoppery lustre. . .. 2.2.2... 9. H.cuprea . . . p.578 \ Not stout, without eoppery lustre . . .».... 10. H.inermis . . . p.578 Gnathopod 2 in d, finger elosing strongly on inner 1 BE Re ne 11. H.jelskii. . . . 'p.578 Gnathopod 2 in d, finger with apex only on inner surface of 6th joint — 12. 18 Peraeopod 1 shorter than peraeopod 2 — 13. - - Peraeopod 1 not shorter than peraeopod 2 — 14, 13 Maxilla 1, palp eomparatively long. . ....» - 12. H. dybowskii . p.579 Maxilla 1, palp very short... .. » 22.2.» 13. H. lubomirskii . p.579 Gnathopod 2 in d, hind margin of 6th joint apically 14 bulging, in 2 6th joint not apically widened . 14. H. meinerti . . p.579 Gnathopod 2 in d, hind margin of 6th joint not apically bulging, in @ 6th joint apically widened 15. H. warmingi . . p.580 1. H. azteca (Sauss.) ?1818 Ampithoe dentata, Say in: J. Ac. Philad,, vo. 1uı p- 383 | 1874 Hyalella d., S.I. Smith in: Rep. U. S. Fish Comm., v.2 p. 645 t.2 f.8—i0 | 1876 Allorchestes dentatus, Faxon in: Bull. Mus. Harvard, v.3 p.373 | 1858 Amphitoe aztecus, Saussure in: M&m. Soc. Geneve, v. 14 p.474 t.5 f.33 | 1888 Hiyalella azteca, T. Stebbing in: Rep. Voy. Challenger, v.29 p.311 | 1862 ? Allorchestes knickerbockeri + Amphitho& a., Bate, Cat. Amphip. Brit. Mus., p.86 t.6 f.1; p.250 | ?1877 Lockingtonia flwvialis, Harford in: P. Calif. Ae., v.7 p.54. 7 Body slightly compressed, pleon segments 1 and 2 each produced in- to a dorsal tooth, usually well marked, but apparently sometimes obsolescent. Side-plates 1—4 almost rectangular. Pleon segment 3, postero-lateral eorners subquadrate. Eyes nearly round. Antenna 1, flagellum rather longer than peduncle, 7—9-jointed. Antenna 2 a little longer, ultimate and penultimate joints of pedunele long, subequal, flagellum little longer than peduncle, 8—12-jointed. Gmnathopod 1 small and slender, palm transverse, nearly straight, defined by a small tooth, behind which apex of finger eloses. Gnatho- pod 2 in JS, 6% joint very stout, a little longer than broad, palm oblique, slightly convex, with abrupt noteh near middle and 2 slight emarginations near defining angle; finger stout, curved. Gmathopod 2in Q weakand slender, 5tk and 6 joints long, narrow, 6tk more than twice as long as broad, hind margin 576 Hyalella produced a little beyond front, though not enough to form a proper chela between the small palm and small finger. Peraeopods 3—5, 24 joint broad, serrate, but smooth in Saussure’s figure. Peraeopod 5 little longer than peraeopod 4. Uropod 3, ramus nearly as long as peduncle, slender, tapering, with setae at apex. Telson stout, ‚as long as broad; apical margin rounded, with slender seta on each side. L. about 4—6 mm. Mexieo; North America (Florida, Conneetieut ete.). Streams, lakes, stagnant water. 2. H. echinus (Faxon) 1876 Allorchestes e., Faxon in: Bull. Mus. Harvard, v.3 p. 867 £.19—21 | 1888 Hyalella e., T. Stebbing in: Rep. Voy. Challenger, v.29 p.455 | 1893 H. e., A. Della Valle in: F. Fl. Neapel, v.20 p.517 t.58 f. 12, 13. Body short, very stout, peraeon segments 1—7 and pleon segments 1—4 each having on hind margin 2 medio-dorsally elevated spine-like processes, and peraeon segments 1—7 with pleon segment 1 each having a small marginal process on either side. Head with small deflexed rostral point, a tuberele on each cheek. Side-plates 1—4 large, triangular, with ridge from centre of base to apex. Side-plate 4 with tuberele on hind margin, side-plate 5 with tuberele on each lobe. Eyes round, large, protuberant. Antenna 1, flagellum 6—8-jointed. Antenna 2, flagellum 9-jointed. Gnatho- pod 2 in d, 6®h joint large, somewhat widened to the rather oblique, slightly concave palm, which receives point of finger in a terminal notch. Gnatho- pod 2 in Q, 5tk and 6th joints subequal. Peraeopods 3—5, 24 joint moderately expanded; peraeopod 3 only °/, as long as the elongate, subequal 4! and 5th peraeopods. L. 5—7 mm. Lake Titicaca. Depth 18—110 m. 3. H. longipes (Faxon) 1876 Allorchestes l., Faxon in: Bull. Mus. Harvard, v.3 P.368 f.22—25 | 1888 Hyalella l., T. Stebbing in: Rep. Voy. Challenger, v,29 p.455 | 1893 H.1., A. Della Valle in: F. Fl. Neapel, v.20 p. 515 t.58 £. 6,7. Peraeon segment 1 with front margin forming a short medio-dorsal tooth; peraeon segments 1—7 and pleon segments 1—3 each with hind margin produced to a backward-pointing, medio-dorsal tooth or spine-like process, small on peraeon segments 1—4 (the first 2 teeth sometimes longer, curved forward), large on the others, largest on pleon segments 1 and 2; pleon seg- ment 4 with hind margin forming a median projection either subacute or convex. Side-plates 1—4 long, apically pointed. Pleon segments 1—3, postero-lateral corners slightly produced. Eyes round, protuberant. Antenna 1, flagellum 13-jointed. Antenna 2 somewhat longer, flagellum 14-jointed. Gmathopod 2 in S, 6t% joint not very large, widening to palm, which is not very oblique, defined by a small projecting tooth. Peraeopods 4 and 5 very long. Uropod 3 very short, with a very slender seta at tip. L. about 10 mm. Lake Titicaca. Depth 20—72 m. 4. H. lucifugax (Faxon) 1876 Allorchestes I, Faxon in: Bull. Mus. Harvard, v.3 p.369 f.26 | 1888 Hyalella l., T. Stebbing in: Rep. Voy. Challenger, v.29 p.455 | 1893 H.1!., A. Della Valle in: F. Fl. Neapel, ©.20 p.515 t.58 f.4,5. Q unknown. — C. Very like H.longipes, with the same number of dorsal processes, but 1° dorsal tooth overlies the head, the next 6 are also large, curved forward. Side-plates 1—4 with rounded apices. Antennae 1 and 2 subequal. L. 11 mm. Lake Titicaca. Depth 72—110 m. ee a cn a tl? „I m ke Hyalella 577 5. H. latimana (Faxon) 1876 Allorchestes latimanus, Faxon in: Bull. Mus. Harvard, v.3 p.370 f.27, 28 | 1888 Hyalella I., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.455 | 1893 H. latimana, , A. Della Valle in: F. Fl. Neapel, «.20 p.515 t.58 £. 8.. Body thick, peraeon segments 6 and 7 and pleon segments 1—3 each produced to a small medio-dorsal spiniform tooth. Side-plates 1—4 quadrate, their lower angles rounded, side-plate 4 emarginate behind. Pleon seg- ments 1—3, postero-lateral corners prolonged backward. Eyes nearly round. Antenna 1 ?/, as long as antenna 2, pedunele reaching middle of ultimate joint of peduncle of antenna 2. Antenna 2 half as long as body, number of joints in flagellum not recorded. Gnathopod 2 in J, 6! joint large, broader than long, widening much to the palm, which is moderately oblique, straight, defined by a prominent tooth. Gnathopod 2 in O0 much smaller. Peraeopod 5 of moderate length. Uropod 3 reaching a little beyond telson. Telson broad. L. 7—12 mm. Lake Titicaca. Depth 18—36 m. 6. H. longipalma (Faxon) 1876 Allorchestes longipalmus, Faxon in: Bull. Mus. Harvard, v.3 p.871 f.29—31 | 1888 Hyalella l., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 455 | 1893 H. longipalma, A. Della Valle in: F. Fl. Neapel, v.20 p. 516 t. 58 f.9. Very near to H.latimana, but peraeon segment 5 in addition having a dorsal tooth. Eyes round, antennae 1 and 2 each with flagellum of 15 joints. Gnathopod 2 in J, 6th joint large and swollen, palm sinuous and very long, setose, so oblique as to leave a very short hind margin, from which it is defined chiefly by impact of finger. Telson with seta on each side of hind margin. L. 9—13 mm. Lake Titieaca. 7. H.armata (Faxon) 1876 Allorchestes armatus, Faxon in: Bull. Mus..Harvard, v.3 p.364 f.1-—18 | 1888 Hyalella armata, T. Stebbing in: Rep. Voy. Challenger, v.29 p.455 | 1893 H. a, A. Della Valle in: F. Fl. Neapel, v.20 p.514 t.58 £.2,3. Body stout, hind margin of segments raised in conspieuous transverse ridge. Side-plates 1—4 produced into spine-like processes (longer in specimens from greater depth), 1°:—34 direeted downward and forward, 4! about twice as long as 34, at right angles to length and height of body. Eyes round. Antenna 1, pedunele reaching middle of ultimate joint of peduncle of antenna 2, flagellum 12-jointed. Antenna 2 much longer than antenna 1, gland-cone prominent, flagellum 13-jointed. Maxilla 1, palp (in figure) reaching more than half the distance from its base to apex ofouter plate. Gnathopod 1, 5'"jointas broad (in figure broader than and as long) as 6", palm transverse, slightly concave, finger curved. Gnathopod 2 in C very large, 6tk joint widening much to the palm, which is oblique, straight, with small setae, finger slender, curved. Gnathopod 2 in Q smaller, 5! and 6% joints subequal, palm nearly trans- verse. Peraeöopods 3 and 4 apparently with narrow 24 joint. Peraeopods 4 and 5 elongate. Branchial vesiecles simple. Marsupial plates long and rather broad, fringed with short setae, apex pointed. Uropod 3 very small, curved upward, projecting little beyond the broad telson. Integument with rows of microscopie hairs. L. 7—10 mm. Lake Titieaca. Depth 20—120 m. 8. H.longistila (Faxon) 1876 Allorchestes longistilus, Faxon in: Bull. Mus. Harvard, v.3 p.375 £.37 | 1893 Hyalella dentata var.?, A. Della Valle in: F. Fl. Neapel, v.20 p. 517. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda T. 37 578 Hyalella Body smooth, long, slender. Side-plates 1—4 quadrate. Pleon segments 1—3, postero-lateral corners acute. Eyes nearly round, dark, approximating above. Antenna 1 nearly as long as antenna 2, flagellum 13-jointed, both antennae shorter in Q than in d. Gnathopod 2 in J, 6* joint large, widening to the oblique, rather convex palm, which is defined by a projection; 6! joint in © long and narrow. Peraeopods 3—5 said to be subequal, but in figure showing the usual successive elongation. Uropod 3 very long, extending far beyond the tip of the telson, almost to the end of uropod 2. Telson with 2 long setae on hind margin. L. 3—6 mm. Brazil (near Campos). 9. H. cuprea (Faxon) 1876 Allorchestes cupreus, Faxon in: Bull. Mus. Harvard, v.8 p. 372 f. 32—84 | 1895 Hiyalella cuprea, A. Della Valle in: F. Fl. Neapel, v.20 p.514 1.58 £.1. Body stout, smooth. Side-plates I—4 rather deep. Pleon segment 3, postero-lateral corners quadrate. Antenna 1, flagellum about 10-jointed. Antenna 2 considerably longer, about '/, as long as body. Gnathopod 2 in d, 6tk joint swollen, palm convex (or, in figure, sinuous), setiferous, oblique, defined by a prominence, finger strong, eurved. Gnathopod 2 in Q, 6th joint long and narrow. Peraeopods 3—5, 24 joint large, hind margin slightly serrate. Peraeopod 3 much shorter than peraeopods 4 or 5. Colour in many parts a coppery lustre L. 9—11 mm. Lake Titicaca. 10. H. inermis S.I. Sm. ?1860 Amphithoe andina, A. Philippi, Reise Atacama, p.170 | 1888 Hyalella a., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 326 | 1874 H. inermis, S.I.Smith in: Rep. U. S. geol. Surv. Terr. 1873, p.609 t.1f.1,2 | 1891 H.i., T. Stebbing in: E. Whymper, Trav. Great Andes, p.361 f.; suppl. p.125 | 1876 Allorchestes dentatus dar. inermis + A.d. var. gracilicornis, Faxon in: Bull. Mus. Harvard, v.3 p. 373 f.; p.374 | 1893 Hyalella dentata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 516. Body entirely devoid of dorsal teeth. Appendages as in H. azteca (p. 575), except: Antenna 1 in S reaching middle of flagellum of antenna 2; 34 joint of peduncle fully as long as 24; flagellum longer than peduncle, 8—10-jointed. Antenna 2, flagellum much longer than peduncle, 12-jointed (in var. gracilicornis Q antenna 2 half as-'long as body, twice as long as antenna 1; flagellum 13-jointed). Gnathopod 1, 5tk and 6th joints stout, 6% widening to palm, which is defined by a blunt tooth, 6% joint bent down on broad apex of 5tk; gnathopod 2 has the palm nearly straight, without any abrupt notch near the middle; finger slightly curved, terminating in an acute horny tip. L. 4—6 mm. Colorado; Ecuador; Peru; Argentina; Chili. In pools, lakes (Titicaca), canals ete., | also in saline water; to a height of 4053 m. 11. H. jelskii (Wrzesn.) 1879 Hyale (Allorchestes) j., Wrzesniowski in: Zool. Anz., v.2 p.176, 490 | 1888 H.j., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1705 | 1893 Hyalella j., A. Della Valle in: F. Fl, Neapel, v.20 p. 514. Head longer than 1° peraeon segment. Eyes small, circular. Antenna 1 more than half as long as antenna 2, flagellum twice as long as peduncle, with 11 joints ind and 9 ino. Antenna 2 ind ?/, as long as body, flagellum twice as long as peduncle, with 18 joints; in Q more than "/, as long as body, flagellum twice as long as peduncle, 14-jointed. Maxilla 1, palp less than !/, distance between its base and apex of inner plate. Hyalella 579 Gnathopod 1 as in H. dybowskii, except that 6% joint is only °/, as long as 5th, Gnathopod 2 in C, 5tk joint '/, as long as 6tk, palm rather oblique, spinose, finger with '/, of its length on inner surface of hand when closed. Gnathopod 2 in Q, 6f% joint 2"/, times as long as broad. Peraeopods 1 and 2 subequal. Peraeopod 4 slightly longer than peraeopod 5. Accessory branchiae on gnathopod 2 and peraeopods 1—3 successively longer, on peraeopod 4 longest and double, on peraeopod 5 wanting. L. © 4, 0 5 mm. East slope of Cordilleras (Pumamarca). Height 2511 m. 12. H. dybowskii (Wrzesn.) 1879 Hyale (Allorchestes) d., Wrzesniowski in: Zool. Anz., v.2 p.199 | 1888 H.d., T.Stebbing in: Rep. Voy. Challenger, v.29 p. 1705 | 1893 Hyalella d., A. Della Valle in: F. Fl. Neapel, v.20 p. 514. Head as long as peraeon segment 1. Eyes oval, widened below. Antenna 1 little more than half as long as antenna 2, peduncle ?/, as long as flagellum, which has in G 13, in 9 10 joints, most of them with a couple of sensory filaments. Antenna 2 half as long as body, peduncle ?/, as long as flagellum, which has in 9 15, in © 14 joints. Maxilla 1, palp about ?/, as long as distance between its base and the apex of outer plate. Gmatho- pod 1, 5th joint as long as 6th, 6th narrow at base, front margin convex, hind concave, palm transverse, with 2 not very prominent rounded lobes, finger shorter than palm. Gnathopod 2 in C, 5tk joint as long as 4b, half as long as 6b, 6th triangular, palm °/, as long as the joint, rather oblique, forming a single curved lobe, finger passing its apex only between 2 palmar spines on to surface of joint. Gnathopod 2 in Q like gnathopod 1, but more slender, 6! joint small, not twice as long as broad. Peraeopod 1 considerably shorter than peraeopod 2. Peraeopods 4 and 5 equal. Simple tubular accessory branchiae on peraeopods 1—5. West slope of the Cordilleras (Pancal, Montana de Nancho). Height 2196 m. 13. H. lubomirskii (Wrzesn.) 1879 Hwyale (Allorchestes) I, Wrzesniowski in: Zool. Anz., v.2 p.177 | 1888 H.1., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1705 | 1893 Hyalella l., A. Della Valle in: F. Fl. Neapel, v.20 p. 514. Head as long as peraeon segment 1. Eyes rather large, irregularly oval. Antenna 1 half as long as antenna 2, flagellum not twice as long as peduncle, 10-jointed. Antenna 2 little over half as long as body, flagellum more than twice as long as peduncle, 18-jointed. Maxilla 1, palp less than !/, distance between its base and apex of inner plate. Gmathopod 1 as in A. jelskii, but 6% joint almost as long as 5". Gnathopod 2 in J, 5tk joint less than '/, as long as 6t", palm rather oblique, spinose, forming 2 lobes, finger with apex only on inner surface of hand. Gnathopod 2 in O, 6f* joint not quite twice as long as broad. Peraeopod 1 a littie shorter than peraeo- pod 2. Peraeopod 4 longer than peraeopod 5. Accessory branchiae simple, quite rudimentary on gnathopod 2, very small on peraeopods 1 and 2, longer than the principal branchiae on peraeopods 3—5. L. 5—6 mm. West slope of Cordilleras (Pacasmayo). Height 2511 m. 14. H. meinerti Stebb. 1899 H.m., T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.407 t. 32». Side-plates I—3 deeper than broad. Pleon segment 3, postero-lateral corners acutely quadrate. Eyes black, usually wider apart than the diameter. Antenna 1 slender, more than half as long as antenna 2, 34 joint nearly as long as 24, but much resembling joints of flagellum, flagellum with 9 or 10 87* ni Be 580 i Hyalella elongate joints. Antenna 2 slender, more than half as long as body, ultimate joint of peduncle long, flagellum with 13—15 elongate joints. Gnathopod 1 in C as in H. inermis (p. 578) but less robust, the 6! joint searcely widening to the transverse palm. Gmathopod 2 in C (Fig. 97), 24 joint narrow, 4th with rounded apex, 5!" with the usual eup-forming frimged lobe, 6" much longer than broad, basal part narrow, rather abruptly widening at the boss which definesthe oblique, slightlysinuous palm. Gnathopods 1 and 2 in 9 small, 4th joint with rounded apex, 6" in gnatho- ON /-2e-- aM joint pod 1 shorter than 5t, but in gnatho- Dans pod 2 about as long, in both narrow, WEIN - Telscn oblong, narrowest at base, the’ short palm transverse or slightly tending to -- Uropod.3 form an acuteangle with the hind margin. Peraeopods 3—5 suecessively a little Fig. 97. Fig. 98. longer, 24 joint oval in peraeopods 3 Gnathopod 2, d. TUropod 3 and telson. and 4, much wider in peraeopod 5. Fig. 97 &98. H. meinerti. 2 Eggs and marsupial plates large. Acces- sory branchiae on peraeopods 1—5, ordinary branchiae not perceived on peraeopod 5. Uropods 1—3 unusually slender; uropods 1 and 2 with lateral spines on both rami. Uropod 3 (Fig. 98) eomparatively long, the tapering ramus rather longer than pedunele, extending considerably beyond the telson. Telson (Fig. 98) oblong oval, with pair of spinules on rounded apex. L. 5—-6 mm. Brazil (Laguna di Espino). 15. H. warmingi Stebb. 1899 H. w., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.406 t.32A. Body rather robust. Side-plate 6 deeply lobed behind. Pleon seg- ment 3, postero-lateral corners a little produced backward, acute. Eyes small, dark, rounded, more than the diameter apart. Antenna 1, 24 joint little shorter than 1%, 34 a little shorter than 24, flagellum with 13 joints in 9, 10 in Oo. Antenna 2 more than half as long as body, gland-cone promment, ultimate joint of pedunele longer than penmultimate, flagellum with 19 joints in C, 15 ing. Maxilla 1, palp minute. Maxillipeds, 4% joint of palp with curved spine on the blunt end. Gmathopod 1 in CS, 5tk joint with bulging hind margin fringed, 6'k shorter, widening with sinuous hind margin to the trans- verse palm, which is defined by a process within which the finger eloses, an oblique row of spinules on surface. Gmathopod 2 in 9, 24 joint not lobed below, 5th short, the fringed cup-forming process rather long, 6 joint large, oval, palm very oblique, sinuous, forming 3 lobes, of which the centre one is broadest, the finger elosing at the 34 into a pocket, which meets’ the hind margin at a well defined angle. Gnathopods 1 and 2 in © similar to gnathopod lin. Ö, but smaller, and 6%» joint in gnathopod 2 in Q rather longer and more slender than in gnathopod 1. Peraeopods 1—5 tolerably robust and spinose. Peraeopod 1 not shorter than peraeopod 2. Peraeo- pods 3—5, 24 joint broadly oval, subequal in peraeopods 3 and 4, considerably larger in peraeopod 5. Simple accessory branchiae on peraeopods 1—4 not so long as prineipal branchiae. Uropods 1 and 2 with lateral spines on both rami. Uropod 3, ramus as long as peduncle. Telson squared at base, then broadly rounded with 2 distant setules on broad apical margin. Colour dusky in spirit. L. 5—6 nm. Brazil (Lagoa Santa, watercourse near Rio de Janeiro). Height 1200 m. Gang 2: ua TEE DT L am rn tete 7 en az NET Allorchestes 581 13. Gen. Allorchestes Dana 1849 Allorchestes (part.), J. D. Dana in. Amer. J. Sci., ser.2 ».8 p.136 | 1852 A, (part.), J. D. Dana in: P. Amer. Ac., v.2 p.205 | 1888 A. (part.), T. Stebbing in: Rep, Voy. Challenger, v.29 p. 1686 | 1880 Aspidophoreia (Sp. un.: A. diemenensis), Haswell in: P. Linn. Soe. N. S. Wales, v.5 p.101. Distinguished from Hyale (p. 559) by gnathopod 2 in JS (Fig. 99 p. 583), which has the 5t" joint produced behind between the 4!" and 6% joints, and from Hyalella (p. 574) by having the telson (Fig. 100 p. 583) more or less divided; sometimes the palp of ER 1 BgrpeB with that of Hyale, sometimes with that of Hyalella. 5 accepted and 13 doubtful species. Synopsis of accepted species: plate — 2. N Maxilla 1. palp not reaching apex of outer 1 | Maxillal, palp reaching apex of outer plate — 4. 9 Gnathopod 1 ind, finger much longer than palm 1. A. novizealandiae. . p.581 Gnathopod 1 in 5, finger matching palm — 3. er f Telson divided to the base... ...... 2. A. compressus . . . p.581 \ Telson not divided beyond the middle . . . 3. A. malleolus . . . . p.582 A f Apices of telson acute. .. .. . 2.2... 4. A. plumicornis . . . p.583 t Apices of telson truncate . ........ Du De BI 5 2 5 oo p- 584 1. A. novizealandiae Dana 1852 A.n.-z. (2) + A. intrepida ($), J. D. Dana in: P. Amer. Ac., 0.2 p.207 | 1853 & 55 A.n., J. D. Dana in: U. S. expl. Exp., v.13u p-894; t.61 f. 1a—f (S), g&—v (2) | 1862 A. novae-zealandiae, Bate, Cat. Amphip. Brit. Mus., p.37 t.6 f.3 | 1886 A. neo-zelanica, G.M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.144 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Side-plate 4 very large. Antenna 1, flagellum more than twice as long as peduncle, 16-jointed. Antenna 2 in O little longer than antenna 1, more considerably longer in 9, in J scarcely '/, as long as body, flagellum longer than peduncle, with 14 very slender joints. Maxillipeds, 34 joint of palp broad. Gmnathopod 1 in C quite small, 5! joint fully as long as 6th, distally much broader, with narrow, subacute prolongation of hind margin, 6th oblong, slightly wider at base, palm transverse, excavate, defined by an acute tooth, finger more than twice as long as palm. Gnathopod 2 in GC, 5th joint narrowly produced between 4th and 6!h, 6th large, ovate, palm nearly straight, oblique, longer than hind margin, spinulose, finger long, yet not reaching rounded end of palm. Gnathopod 1 in Q, 5 joint distaily wide, but without acute process, 6" widening a little to truncate palm, finger not longer than palm. Gmathopod 2 in Q, 4b joint somewhat produced, 5" strongly produced along hind margin of 6'%, process with a rounded apex, 6th as in gnathopod 1 but rather larger. Peraeopods 3—5 successively longer, setae minute, 4* joint expanded, especially in peraeopod 3. Uropod 1, one of the rami (in figure) with only apical spines. L. 10 mm. | Pacific (New Zealand, in holes in wood bored by Teredos; Valparaiso ?). 2. A. compressus Dana 1852 A. compressa + A. australis, J. D. Dana in: P. Amer. Ac., v.2 p. 205, 206 | 1853 & 55 A. a. + A. gaimardü?, J. D. Dana in: U. S. expl. Exp., v. 1311 p. 892 t.60 f.7a—o; p. 884 t.60 f.l1a—i | 1862 A.a. + A. g., Bate, Cat. Amphip. Brit. Mus., p.45 t.7 £.6; p.41 t.6 f.9 | 1880 Aspidophoreia diemenensis, Haswell in: P. Linn. Soe. N. S. Wales, ©.5 p.101 t.6 f.2 | 1893 Hyale prevostüi (part.) + H. pontica (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519, 523, 528, 530. 582 Allorchestes Body compressed, especially at pleon. Side-plates 1—4 deep, 4 also wide, 5th shallow, 24—4th quadrate. Pleon segment 3, postero-lateral corners quadrate, with minutely produced point. Eyes oval, wider apart than the longer diameter. Antennael and 2 ofrather variable proportions(in young from mother’s pouch subequal). Antenna 1 usually rather longer than peduncle of antenna 2, flagellum 10— 20-jointed. Antenna 2, flagellum shorter or not much longer than peduncle, 10—20-jointed, upper lip broader than deep. Maxilla 1, palp minute, Maxillipeds, 2% and 34 joints of palp broad. Gmathopod 1 in J, 5th joint slightly longer than 6, widest subapically, with spinules at the projecetion of front and hind margins, 6% joint oblong, a little widened at almost transverse convex palm, front margin convex, hind rather sinuous, finger fitting palm. Gmathopod 2 in C robust, 24 joint with small downward produced lobe, 34 also with front margin lobed, 4b apieally produced behind, 5th produced backward in a rather slender and not strongly spined lappet, 6!h large, the palm spinulose, very oblique, defined from the slightly bulging hind margin by palmar spines and the small hollow which receives the apex of the strong finger. Gmnathopod 1 in O as in J, except that 6tk joint is more elongate, as long as 5. Gmathopod 2 in Q rather larger than gnathopod 1, 24 joint not produced downward, 34 without conspiceuous lobe, 4th produced as in JS, 5tk with lappet stretehing along part of straight hind margin of 6t", 6! hroader than in gnathopod 1, slightly widening to the transverse palm, finger matching palm. Branchial vesicles large, oval, with narrow neck. Marsupial plates broad, oblong, produced at one corner, setae short. Peraeopods 1 and 2 subequal, slender. Peraeopod 3, 24 joint oblong oval, front margin with spines, nearly straight, hind margin nearly smooth, 4th joint widened, spinose on both margins. Peraeopod 4 considerably longer, 24 and 4tk joints not quite so wide; branchial vesicles in peraeopods 3 and 4 with accessory lobe. Peraeopod 5 shorter than peraeopod 4, especially in J, but 24 joint much larger and more rounded behind. widest subapically and broadly produced behind 34 joint, 4{k not much widened, finger as in all the peraeopods short, curved. Uropod 1, rami deeidedly shorter than peduncle. Uropod 2, rami a little shorter than peduncle. Uropod 3, ramus small, conical, shorter than stout pedunele, tipped with a minute spinule. Telson broad, the 2 quadrate lobes, separated by a linear fissure, set at an angle to one another, gable-like. Surface ornamented with coloured spots and white‘ dots (Haswell). L. 11—20 mm. Southern Indian Ocean and South-Paeifie (south- and west-coasts of Australia, Tasmania). . 3. A. malleolus Stebb. 1899 A. m.. T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.409 t.33A. Body moderately compressed. Side-plates 1—-4 rather deep, with no projeeting point of hind margin. Pleon segment 3, postero-lateral corners bluntly produced. Eyes not large, rounded, at least their diameter apart, dark in spirit. Antenna 1 about °/, as long as antenna 2, joints of peduncle successively shorter, flagellum longer than pedunele, 10—12-jeinted. An- tenna 2 not more than !/, as long as body, peduncle stout, flagellum shorter than pedunele, 10—12-jointed. In young from the marsupium antenna 1 not shorter than antenna 2, flagellum of each 2- or 3-jointed. Maxilla 1, palp minute, on well defined interruption of hind margin of outer plate. Maxilla 2, prineipal seta on inner margin of inner plate not very elongate. Gnathopod 1 in C, 24 joint widening rapidiy to the middle, 4% not longer than 34, 5th Jittle longer than 6tk, widest subapically, with spines on both Allorchestes 583 margins at widest part, 6 widening to a palm-like angle, a part of the sinuous hind margin being adapted to rest on hind process of 5th joint, the margin then abruptly turning to join the short spinulose palm, which is exactly fitted by the stout 2-pointed finger. Gnathopod 2 in SC (Fig. 99), 24 joint with no conspieuous distal lobe, 4% produced but not acute, 5th produced into a shallow cup-forming fringed process, 6tb oval, finger closing over an oblique, almost straight palm into the usual pocket, armed with 2 palmar spines, the hind margin not at all bulging, carrying spinules at 2 points. Gnathopod 1 in Oo, 62 joint oblong, slightly widening to transverse palm, hind margin sinuous, finger acute, elosely fitting palm. Gnatho- pod 2 in oO, 4 joint subacutely produced, 5 zu joint with broad fringed process produced partly along 4% joint -° hind margin of 6! joint, which is oblong, hind 6% joint --- "cz margin straight, finger acute, scarcely reaching Fig. 9. Fig. 100, end of transverse palm. In young from marsupium Gmathopod 2. 3. Telson. gnathopods 1 and 2 have a general resemblance EIER OR. N DOSBRSIHR, to gnathopod 1 in Q. Marsupial plates of gnathopod 2 and peraeopod 1 have one distal corner subacutely produced, in peraeopod 2 they end squarely; in all the fringing setae are short. Peraeopods 1—5 not strongly spined, finger eurved. Peraeopods 3—5, 24 joint oblong oval, the front margin nearly straight, hind margin produced downward in rounded lobe; in peraeopod 3 at least as broad and about as long as in the longer peraeopod 4; in peraeopod 4 more oblong than oval, widest proximally; in peraeopod 5 much broader, widest distally,. Peraeopods 3—5 in Q shorter and stouter than in S, 4*b joint. widened distally. Pleopods with 2 or 3 simple coupling hooks, and on inner margin of 1° joint of inner ramus 4 or 5 spines not eleft but at apex a little dilated and hooked. Uropod 3 small, ramus shorter than pedunele. Telson (Fig. 100) nearly square, with slightly convex sides, median cleft not reaching beyond middle, its sides not divergent. L. about 7 mm. Yellow Sea, Sea of Japan. In sea-weed. 4, A. plumicornis (Heller) 1866 Nicea p., Cam. Heller in: Denk. Ak. Wien, v.26ı1 p.5 t.1 f.8,9 | 1899 Allorchestes p., T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p.412 t.33C | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.519. Body compressed. Eyes an elongate round. Antenna 1 reaching nearly to the middle of flagellum of antenna 2, 1% joint longer than 24 or 34, flagellum with 18 or 19 successively lengthening joints. Antenna 2, flagellum longer than peduncle, with 22 joints, terminal joints of peduncle and first half of flagellum beset on underside with long fascicles of setae. Maxilla 1, palp reaching base of spines of outer plate. Maxillipeds, penultimate joint of palp setose, ultimate long, acute. Gnathopod 1 in JS, 4*k joint with blunt produced point, 5!" with broad distal fringed lobe, 6" oblong oval, rather longer than 5th, palm oblique, spinulose, finger somewhat thickened, its outer margin abruptly curving to an acute apex. Gmnathopod 2 in d much larger, 4th joint bluntly produced, 5tk very short, but wide, embracing base of 6, which is oval, with small group of spinules on hind margin, palm oblique, well defined by angle and palmar spines, finger strong, acute, much eurved. Peraeopod 5 like peraeopod 4, but rather longer, 6t" joint slender, straight, finger acute, little curved, setule of inner margin prominent as in all the peraeopods. Uropods 1—3, all the rami with marginal spines. Uropod 3, 584 Allorchestes peduncle rather shorter than telson. Telson divided to the base, the 2 triangular lobes inclined one to. the other. L. 9—12 mm. Mediterranean, Adriatic. 5. A. humilis Dana 1852 A. h,, J. D. Dana in: P. Amer. Ae., «.2 p.206 | 1853 & 55 A.h., J. D. Dana in: U. S. expl. Exp., v.13u p.890; t.60 f.6a—e | 1899 4A.h., T. Stebbing in: Tr. Linn. Soc. London, ser.2 0.7 p.413 t.33D | 1893 Hyale prevostii (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 528. Eyes a little oblong or round, light-coloured. Antenna 1 a little shorter than antenna2, peduncle ?/, as long as pedunele of antenna 2, flagellum with 6—Sjoints, which are very distinet, somewhat moniliform (distally widened). Antenna 2 about '/, as long as body, ultimate and penultimate joints of pedunele subequal,. peduncle with 9 or 10 joints, which are neither very long nor distally widened, setae all short. Maxilla 1, palp reaching base of spines of outer plate as in Hyale (p. 559). Maxillipeds, 39 joint of palp narrow. Gnathopod 1, 5t% joint, short, 6! much longer, oblong, widening to the oblique spinulose palm, with spinules at points of hind margin. Gnathopod 2 similar, 6!" joint considerably larger, though (Dana) not twice as long, palm somewhat more oblique, with defining spine, spinules as in gnathopod 1, 5tk joint with small lobe produced between 4b and 6%, finger curved and short, shutting elose against the palm. Peraeopods 3—5, ga joint nearly orbieular, hind margin slightly cerenulate. ‚Peraeopods 1—5 moderately stout, finger curved, with inner setules, as usual.. Branchial vesicles narrow proximally, then becoming inflated. Uropod 3 very short, ramus as long as peduncle, each with apical spines. Telson divided beyond the middle, the apices divergent, truncate, tipped with spinules. L. 5—8 mm. Pacifie (Port Jackson [East-Australia], shallow pools along shores; Saghalien).. A.angustus Dana 1854 A.a., J.D. Dana in: P. Ac. Philad., 0.7 p. 177 | 1857 A. a., Stimpson in: Boston J. nat. Hist., 0.6 p. 520 | 1893 A. a., Hyale (part.)?. A. Della. Valle in: F. Fl. Neapel, 0.20 p. 527. Side-plates 1—4 very deep, 5th shallow. L. 9 mm. North-Paeifie (California). A. brevicornis Dana 1852 A.b., J.D. Dana in: P. Amer. Ac., %.2 p.206 | 1853 &55 A.b., J. D. Dana in: U..S. expl. Exp., v 1311 p.898; t.60 f.8a—h | 1893. Hyale prevostii 2 (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 528. Perhaps young 3 of a Hyale (p.559). L. 10 mm. South-Paeifie (New Zealand). Along shores of the Bay of Islands. A.istrieus (Grube) 1861 Amphithöe (Hyale) istrica, E. Grube, Ausfl. Triest, p.135 | 1864 Nicea i., E. Grube in: Arch. Naturg., v.301 p.200 | 1866 X. i., E. Grube in: Arch. Naturg., v. 321 p.887 t.9 £.5 | 1868 N.i., Czerniavski in: Syezda Russ. Est.,. Syezda 1 Zool. p.114 t.8 f.24,25 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. L. 6—9 mm. Adriatic (Trieste), Black ‘Sea. A.japonicus Stimps. 1855 A, japoniea, Stimpson in: P. Ac. Philad., v.7 p.883 | 1893 Hyale pontica (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 528. Eyes large, black, very broad oval, closely approaching each other above, L. 12 mm. North-Paeific (Japan). | | | } i x 7 y : Allorchestes, Aoridae 585 A.littoralis Stimps. 1853 A.l., Stimpson in: Smithson. Contr., 0.6 nr.5 p.49 t.3 f.36 | 1873 Hyale l., (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 .p.556 | 1893 H. prevostü (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.519. L. 8—10 mm. - North-Atlantic (America from Kae Bay to Grand Manan). Among fucus, ete. and in tide-pools. A. patagonicus R. O. EEE 1871 A.p., R. ©. Cunningham in: Tr. Linn. Soe. London, ©.27 p.498 t.59 f.14 | 1888 Hyalella sp.?, T. Stebbing in: Rep. Voy. Challenger, v.29 p.404 | 1893 H. sp.?, A. Della Valle in: F. Fl. Neapel, v.20 p.514. No description; perhaps a species of Hyalella (p. 574). Strait of Magellan, Sandy Point. In a freshwater stream. = * paulensis Heller 1865 A. p., Cam. Heller in: Reise Novara, v.2ı1 Crust. p.128 t.11 f.4 | 1888 Hyale sp.?, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 383 | 1895 H. prevostii A. Della Valle in: F. Fl. Neapel, v.20 p. 529. L. 12 mm. Southern Indian Ocean? (St. Paul). A. penicillatus Stimps. 1855 A. penicillata, Stimpson in: P. Ac. Philad., v7 p. 883 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 288, 519. Antenna 2 with fascieles of long setae. L. 6 mm. Sea of Japan. A. plumulosus Stimps. 1857 A. p., Stimpson in: Boston J. nat. Hist., v.6 p.519 | 1893 Hyale prevostii (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 519. Antenna 2 with fascieles of plumose setae. L. 10 mm. San Francisco Bay. Gravelly shores in the littoral zone. A.rubricornis Stimps. 1855 A.r., Stimpson in: P. Ac. Philad., v.7 p.383 | 1879 Hyale (A.) r., Wrzesniowski in: Zool. Anz., v.2 p.200 | 1893 Hyale sp.?, A. Della Valle in: F. Fl. Neapel, v.20 p. 529. L. 16 mm. Sea of Japan. A, sayi Bate 1862 A.s., Bate, Cat. Amphip. Brit. Mus., p.89 t.6 £.5 | 189 Podecerus falcatus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 453. L. 9 mm. North- America. A.stylifer Grube 1866 A.s., E. Grube in: Arch. Naturg., v.32ı p.386 t.$ f.4 | 1898 Hyale prevostü (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 520. Gnathopod 2 in d, 5th joint very short, distally produced to a curved stiliform process between 4th and 6th. L. 5 mm. Adriatie. Under stones on beach. A.sp., Heller 1866 Nicea nilsoni (err., non Amphitho£ nilssonii H. Rathke 1843]), Cam. Heller in: Denk. Ak. Wien, v.26ı1 p.4. L. & 5—6 mm. Adriatie. 33. Fam. Aoridae 1899 Aoridae, T.. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 211. Head, lateral lobes little produced. Side-plates of very moderate depth, 4th with hind margin not excavate. Antenna 1 the longer, with 34 joint 586 Aoridae, Aoroides short (except in Paradryope, p. 602), with accessory flagellum (except in Aoroides). The mouth-organs appear to agree in having border of upper lip round or very faintly emarginate, lower lip with acutely produced mandibular processes. Mandible with 34 joint of palp longer than 24. Maxilla 1 with a single seta on inner plate, 10 spines on outer, 24 joint of palp elongate; maxilla 2 with inner plate fringed. Maxillipeds well developed. Gnathopods1 (Fig. 101) and 2 not simple, 1% the larger, and its shape usually differing much in Ö and Q. Peraeopöds 1 and 2 glandular. Peraeopod 5 the longest. Branchial vesicles simple. Uropods 1—3 biramous, 34 not elongate. Telson simple. The position of Paradryope (p. 602) in this family cannot, however, be regarded as absolutely secure, and Della Valle’s suggestion that Imay have transposed the gnatho- pods 1 and 2, if it could be substantiated, would give a welcome relief, by permitting the transfer of the genus to the Photidae (p. 603). Marine... . 7 genera, 25 accepted species and 3 doubtful. Synopsis of genera: 1 | Antenna 1 without accessory flagellum -. . . 1. Gen. Aoroides. . . . p.586 Antenna 1 with accessory flagellum — 2. Gnathopod 1 in S (Fig. 101), Ath joint immensely DIEBBGEOR N ee ine 2. Ben; Aora 2,7, 2% p- 587 Gnathopod 1 in 8, 4th joint not immensely produced — 3. Gnathopod 1 in g, 5th joint produced to a 1 A Be 3. Gen. Microdeutopus . p. 588 Gnathopod 1 in g, 5th joint not produced to a strong tooth — 4. Uropod 8, rami not minute — 5. | Uropod 3, rami minute — 6. Gnathopod ling, 5th and 6th joints subequal Wahn: un N ern Gnathopod 1 in S, 5th joint much wider than 6th Pleon segment 6 dorsally evanescent | Pleon segment 6 not dorsally evanescent 4 5 Gen. Lembos . . . . p.594 . Gen. Lemboides . . . p. 600 6 . Gen. Dryopoides . . p.601 op 1. Gen. Aoroides A. Walker 1898 Aoroides (Sp. un.: A. columbiae), A. O. Walker in: P. Liverp. biol. Soe., v.12 p. 284. Oo. Asin Aora and Micoisaioine (p.588), except that antenna 1 is entirely devoid of accessory flagellum, and mandibular palp is very slight and very sparingly furnished with setae on the 34 joint. 1 species. 1. A. columbiae A. Walker 1898 A.c., A. O. Walker in: P. Liverp. biol. Soe., v.12 p. 285 t. 16 £.7—10. Ö unknown. — 9. Like © of Microdeutopus anomalus (p. 591) except for the generic differences, and side-plate 1 rounded below, peraeopods 3—5 with wider 24 joint, uropod 3 with peduncle as long as the rami, which are equal, inner ramus with 1 spine about the middle of the inner margin, outer with apical spines only. L. 5 mm. Puget Sound. Gen. Paradryope . . p.602. E 2 4 # F Aora 587 2. Gen. Aora Kıroyer 1845 Aora (Sp. un.: A.typica), Kroyer in: Naturh. Tidsskr., ser.2 e.1l p.328, 335 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1072 (synonymy to date) | 1893 A., A. Della Valle in: F. Fl. Neapel, v.20 p.406 | 1894 A., G.O. Sars, Crust. Norway, v,1 p.544 | 1849 Lalaria (Sp. un.: L. longitarsis), H. Nicolet in: Gay, Hist. Chile, v.3 p.240 | 1856 Lonchomerus (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 L. (Sp. un.: L. gracilis), Bate in: Ann. nat. Hist., ser.2 v.19 p. 143 | 1857 Lalasia, Bate in: Ann. nat. Hist., ser.2 v.20 p.525 | 1859 Autonoe (part.), R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.23. Body slender. Head, lateral lobes obtuse. Side-plates of medium depth, ‘in d 1% somewhat produced forward, 24 rather larger than 34, 5th Jess deep than 4%, Antenna 1 much the longer, flagellum long, accessory flagellum well developed. Lower lip with mandibular processes strongly produced. Mandible, both eutting plates dentate, spine-row of 3 or 4 spines, molar strong. Maxilla 1, inner plate small, with 1 apical seta, 24 joint of palp with several spine-teeth. Maxilla 2, inner plate the smaller, its inner margin fringed. Maxilli- peds, inner and outer plates well developed, well armed, finger of palp not stout. Gnathopod 1 in C (Fig. 101) elongate, slender, 4" joint produced into a very long spine-like process behind the 5", which is a little broader and longer than the narrowly oblong 6%, finger much overlapping palm. Gnathopod 1 in Q, 4* joint not produced, 5tt much shorter than 6*%, Gnatho- pod 2 in d and O, 5 and 6tk joints subequal. Peraeopods 3—5, 24 joint not very widely expanded, 4th peraeopod longer than 34, 5th than 4th, Marsupial plates large, broad. Uropod 3, rami equal, much longer than peduncle. l species. 1. A.typica Kroyer 1845 A.t., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p. 328 t.3 f.3a—1 | 1849 Lalaria longitarsis, H. Nicolet in: Gay, Hist. Chile, v.3 p. 243; Crust. t.2 £.8, 8a—f | 1857 Lonchomerus gracilis, Bate in: Ann. nat. Hist., ser.2 v.19 p.143 | 1862 Aora g.+ A. typica, Bate, Cat. Amphip. Brit. Mus., p. 160 1.29 £.7; p.161t.29 f.8 | 1885 A.t., Chilton in: Ann. nat. Hist., ser.5 v.16 p.370|1893 A.g.+ A.t., A. DellaVallein: F.Fl.Neapel, v.20 p.407 t.2 £.9, t. 12 £.25—39, t.56 f. 37; p. 409 t. 56 £. 38-40 | 1894 A.g., G. O. Sars, Crust. Norway, v.1 p. 545 t. 193 | 1859 Autonoe punctata, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 or. 1 p.24t.1f.3a—g | 1879 Microdeutopus maculatus (2), G. M. Thomson in: Ann. nat. Hist., ser. 5 v.4 p. 331.16 £.5—8 | 1881 Microdentopus m., G. M. Thomson in: Tr. N. Zealand Inst., 0.13 p. 217 t.8f.74—c | 1882 M. m. (3), Chilton in: Tr. N. Zea- land Inst., v. 14 p.173t.8 f.3a,b | 1879 Microdeuteropus tenuipes (2) M. mortoni (S), Haswell in: P. Linn, Soc. N. S. Wales, v.4 p.339 t.22 f.1,2 | 1882 Microdeutopus t. + M. m., Haswell, Cat. Austral. Crust., p. 264 | 1888 Aora kergueleni + A.trichobostrychus, T. Stebbing in: Rep. ER ra Voy. Challenger, ®%. 29 p. 1073 t. 109, £.A 8, f.D$9; p. 1078 t.109£.B 8, f.C 2. - Pleon segment 3, ‚postero-lateral corners obtusely quadrate. Eyes small, oval, dark. Antenna1 ?/, as long as body, 24 joint the longest, 3—4 times as long as 34, flagellum with 20—30 joints or more, accessory flagellum 5-jointed. Antenna 2 much shorter, ultimate joint ofpeduncle rather longer than penultimate or than flagellum, Fe hm flagellum 7-jointed. The gnathopod 1 im C (Fig. 101) affords the principal generic character, but the 24 joint in adult 9 (typica) is said to have a triangular process on the front margin, not observed in any of the other forms; in A. trichobostrychus the hind margin of the 24 joint -4----- 4th joint 588 Aora, Microdeutopus has a dense brush of setae, whereas generally it is smooth; the prolongation of the 4th joint, the relative lengths of 5", 6th and finger are very variable, but how far the proportions are constant is as yet indeterminate. In A. gracilis 9 the 24 joint of the 5*k peraeopod is widened near the distal end, while in the ©, and perhaps in both sexes of some forms, it is oblong oval without such widening. The telson is sometimes longer than broad (A. trichobostrychus), nearly as broad as long (A.graecilis, A. kergueleni), usually with the apex obtusely angular, but sometimes (A. gracilis Della Valle, not Sars) emarginate. Colour whitish or greyish, with speckling. L. 8 mm (A. gracilis). North-Atlantie with adjoining seas (Europe), Pacifie (South-America, Australia, New Zealand), southern Indian Ocean (Kerguelen Island). 3. Gen. Mierodeutopus A. Costa 1853 Mierodeutopus (Sp. un.: M. gryllotalpa). A. Costa in: Rend. Soc. Borbon., n.ser. v.2 p.171 | 1876 M., A. Boeck, Skand. Arkt. Amphip., v.2 p.564 | 1888 M., T. Stebbing in: Rep. Voy. Challenger, ©.29 p.299, 1711 | 1893 M., A. Della Valle in: F. Fl. Neapel, v.20 p.410 | 1894 M., G.O. Sars, Crust. Norway, v.1 p.539 | 1856 Lembos (part.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 L. (part.), Bate in: Ann. nat. Hist., ser.2 v.19 p.142 | 1859 Autonoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.23 | 1862 Stimpsonia (Sp. un.: 8. chelifera) (non C. Girard 1853, Nemertini!) + Microdeutopus (part.) (Mierodeuteropus) (Microdentopus Bate), Bate & Westwood, Brit. sess. Crust., v.1.p.284, 287 | 1869 Mierodeuteropus (part.), A. M. Norman in: Rep: Brit. Ass,, Meet. 38 p.281 | 1874 M., T. Stebbing in: Ann. nat. Hist., ser. 4 v.14 p.12 | 1893 Stimpsonella, A. Della Valle in: F. Fl. Neapel, 0.20 p.421. Body slender. Head with lateral lobes usually obtuse. Side-plate 1 in Ö often produced forward, 24 or 3Xthe deepest, remainder successively shallower. Antenna 1, 24 joint the longest, accessory flagellum distinct. General character as in Aora, but gnathopod 1 in S with 4% joint not greatly produced, 5tk very bulky, its hind margin produced to a tooth, which with help of 6*% joint and finger makes the limb complexly subchelate. 10 species accepted, 1 doubtful. Synopsis of accepted species: 1 | Gnathopod 2 in g, palm defined by a tooth — 2. Gnathopod 2 in 3, palm not defined by a tooth— 8. 9 Gnathopod 2 in S, 6th joint much shorter than 5th 1. M. chelifer. . . . p.589 Gnathopod 2 in d, 6th joint not shorter than 5th 2. M: armatus. . . . p.589 *® Gnathopod 1 in 3, tooth of 5th joint with aecessory 3 | tooth or teeth — 4. Gnathopod 1 in d, tooth of 5th joint simple — 8. Gnathopod 1 in S, 5th joint with more than 1 accessory tooth — 5. 4 Gnathopod 1 in ö, 5th joint with only 1 aecessory tooth — 6. Gnathopod 1 in 3, 5th joint with innermost tooth 5 tue las. 02 a ee 8. M. gryllotalpa . . p.590 Gnathopod 1 in S, 5th joint with middle tooth 1 Me ee a ne: 4. M.stationis . . . p.59%0 Gnathopod 1 in S, 5th joint with inner tooth the 6 | me 2 ar RE 5. M.haswelli . . . p.591 Gnathopod 1 in S, Ö5th joint with outer tooth the smaller — 7. Be a ei 3 ee Nm % n x Microdeutopus 589 BR, )e, - |__ SBEESEEH SEE Eee 6. M. anomalus. . . p.591 Gnathopod 1 in 3, 5th joint with Erg tooth apart from primeipal . ...... - « »- 7. M. propinquus.. . p. 592 8 Antenna 1, flagellum shorter than pedunele . . 8. M.megnae. . . . p.592 Antenna 1, flagellum longer than peduncle — 9. Gnathopod 2 in 3 very slender and very setose 9. M. versiculatus . p.593 Guathopod 1 in d, 5th joint with aceessory tooth £ | Gnathopod 2 in & not very slender and not very a Er ek nen RP HE A TEE 10. M. damnoniensis. p.593 1. M. chelifer (Bate) 1862 Stimpsonia chelifera, Bate (& Westwood), Brit. sess. Crust., v.1 p.285 f. | 1862 S. c., Bate, Cat. Amphip. Brit. Mus., p.162 t.29 £.9 | 1878 8. c., T. Stebbing in: Ann. nat. Hist., ser.d5 v1 p.34 t.5 f.2,3 | 1888 S.c., Micro- deutopus (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 334 | 1893 Stimpsonella c., A. Della Valle in: F. Fl. Neapel, v.20 p.424 t.56 f. 42—45. Side-plate 1 with an acute front corner in C. Antennae 1 and 2 sub- equal (Bate: antenna 1 the shorter). Antenna 1, 24 joint longer than 1, 34 very short, flagellum longer than peduncle, accessory flagellum 2-jointed. Antenna 2, antepenultimate joint of pedunele very thick, penultimate very long, at the base winged below so as to equal depth of preceding joint, ultimate about as long as penultimate or flagellum. Gmathopod 1 in C very large, the size chiefly due t6 the 5" joint, the distal tooth of which varies greatly in length, a deep cavity separating it from a little setose tooth adjacent to base of the some- what oblong 6t joint; 6% joint gently eonvex in front with undulating hind margin and no conspicuous palm. Gnathopod 2 in S, 5t" joint much longer than 6tk, 6 as broad as long, widening to the variable palm, which is defined by a tooth sometimes large but capable of vanishing altogether, finger matching ee Gnathopod 1 in O, 6*%* joint slightly larger than 5%, about twice as long as broad, palm defined by a palmar spine, overlapped by_serrate finger. Gnathopod 2 in © similar to gmathopod 1, but much smaller. Peraeopods 1 and 2, 4 and 5‘ joints much broader than 6th, Peraeopods 3—5, 24 joint narrow; peraeopod 5 much the longest; in all peraeopods the 6tk joint has an apical group of setae. Uropod 3, pedunele short, stout, rami equal, little longer than peduncle. Telson with a setule at the lateral notch on each side of the rounded, unproduced apex. L. S—9 mm. English Channel (South-Devon). 2. M. armatus Chevreux 1886 &87 M.a., Chevreux in: Bull. Soc. zool. France, v.11 p.XLI: 0.12 p.312 t.5 £.11, 12; textf.6, 7 p.296 |.1893 Stimpsonella armata, A. Della Valle in: F. Fl. Neapel, v.20 p.422 t.4 f.8; t.11 £.13—24. Very slender; ventral surface of peraeon segments 2—4 (sometimes others?) armed each with a spiniform tooth. Head without rostrum, lateral lobes little prominent. Side-plate 1 in J little produced, in © rhombeidal. , Eyes small, round, black. Antenna 1 rather shorter than the body, 24 joint longer than 1°, 34 over '/, as long as 24, flagellum longer than peduncle, 11-jointed, accessory flagellum very short, with 2 joints, 24 minute. Antenna 2 much the shorter, ultimate joint of peduncle as long as penultimate, slightly longer than the 4-jointed flagellum. Gnathopod 1 in Q, 24 joint very broad ‘ except at the extremities, 5t massive, hind margin finely erenulate distally and produced to a strong tooth, 6% much shorter and narrower, somewhat oblong, with very irregularly crenate hind margin, finger long, slender. Gnatho- 'pod 2 in J, 24 joint broad, front margin somewhat indentured and distally produced, sth almost oblong, 6th rather longer, oblong, palm only slightly oblique, 590 Microdeutopus defined by a small tooth, and sometimes carrying a submedian one, finger matching palm. Gnathopod lin Q, 2% joint not expanded, 5tk shorter than 6th, 6tk oblong but with rather oblique palm defined by a palmar spine and overlapped by finger. Gnathopod 2 in © similar to gnathopod 1 but smaller, and the finger not overlapping the palm. Peraeopods 1—5 slender, little armed; 24 joint in peraeopods 3—5 narrowly oval. Uropods 1 and 2, rami slender, with few spines. Uropod 3, rami equal, a little shorter than peduncle. Telson nearly as broad as long, tapering to a truncate apex, the lateral pro- cesses little marked. Colour yellow, with large blotches of violet-brown on peraeon (Chevreux), front part of peraeon wine-red or grey or yellowish, eggs emerald green (Della Valle). L. 3—4 mm. North- Atlantic (South-East of Brittany); Bay of Naples. Depth 10—20 m. ö. M. gryllotalpa A. Costa 1853 M. g., A. Costa in: Rend. Soe, Borbon., n.ser. ©.2 p.178 | 1876 M. g., A. Boeck, Skand. Arkt. Amphip., v.2 p.565 t.29 f.6| 1884 M.g., H. Blane in: N. Acta Ac. Leop., v.47 p.75 t.9 f.82—90 | 1893 M. g., A. Della Valle in: F. Fl. Neapel, v.20 p.411 t.1 £.12; t.11 £.25—43 | 1894 M.g., G.0. Sars, Crust. Norway, v.1 p.543 t. 192 f.2 | 1859 Autonoe grandimana, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.26 t.1 £.5 | 1862 Microdeutopus grandimanus, Bate, Cat. Amphip. Brit. Mus., p.378 | 1873 M. minax, (8. I. Smith in:) A. E. Verrill in: Rep. U.S. Fish Comm., ®.1 p.562 | ?1885 Amphithoe salenskü, J.V.Carus, Prodr. F. Medit., v.1 p. 396. Body moderately robust. Head without rostrum, lateral lobes blunt, scarcely projeeting. Side-plates shallow, 1° moderately produced in d. Pleon segment 3, postero-lateral corners bluntly quadrate. Eyes small, round, dark (Sars), or whitish grey (Della Valle). Antenna 1 considerably more (Sars; Della Valle: less) than half as long as body, 24 joint rather longer than 1%, 34 about !/, as long as 24, flagellum longer than peduncle, 10—22-jointed, accessory flagellum 1- or 2-jointed. Antenna 2 much shorter, ultimate joint of peduncle as long as penultimate, rather longer than 6- or 7-jointed flagellum. Gmnathopod 1 in JS massive, 24 joint widening from narrow neck, 5tk extremely large, broad oval, armed with 4 teeth successively larger inwards toward base of 6tk joint, which is about '/, the size of 5th, somewhat oblong, but narrowing distally, with sinuous hind margin forming 2 or 3 irregular lobes, finger strong, serrate; teeth of 5t% joint variable: 2—5. Gnathopod 2 in S, 24 joint strongly dilated, except at the extremities, Stk and 6th joints long and narrow, setose, palm and finger very small. Gnatho- pod 1 in ©, 24 joint not expanded, 5tk rather robust, shorter than oblong 6{h, palm rather oblique, ill-defined, overlapped by finger. Gnathopod 2 in Q, 24 joint not expanded, otherwise nearly as in 9, but smaller. Peraeo- pods 1—5 slender, 24 joint in peraeopeds 3—5 not greatly expanded, oblong in 34, long oval in 5tk, Uropod 3, rami subequal to peduncle, inner rather . the shorter. Telson rather longer than broad, apex convex (Sars in figure), or broader than long, apex concave (Della Valle), with 2 or 3 setules on each side of apex. Colour, densely variegated with dark brown. L. 4-8 mm. North-Atlantie with adjoining seas (Europe, from Norway to Venice (not all localities to be trusted); East of United States of America). 4. M. stationis Della Valle 1881 M. gryllotalpa (err., non A. Costa 18531), Nebeski in: Arb. Inst. Wien, v.8 p.155 t.13 f.41 | 1880 M.g., Sowinski in: Mö&m. Soc. Kiew, &.6 p.128 t.5 f£.17a—d | 1893 M. stationis, A. Della Valle in: F. Fl. Neapel, v.20 p.415 t.5 f.2, t.10 £.31-—41 | 1895 M. s., Sowinski in: Mem. Soc. Kiew, v.14 p- 237 t.4 £.1—6 | 1898 M. s., Sowinski in: M&m. Soc. Kiew, v.15 p. 480. Je ee Dr Mierodeutopus 591 General aspect that of an Ampithoe (p. 631). Mouth-parts, peraeopods. and uropods as in M. gryllotalpa; uropods more slender. Head rather large. Side-plate 1 in S very much and acutely produced, in Q rhomboidal. Eyes. small, round. Antenna 1 rather slender, 24 joint longer than 1°, more than. thricee as long as 34, flagellum much longer than pedunele, 24-jointed, accessory flagellum longer than 34 joint of peduncle, 4-jointed. Antenna 2 moderately robust, ultimate joint of peduncle as long as penultimate, much longer than the 8-jointed flagellum (Della Valle), or rather shorter than the 9-jointed flagellum (Sowinski). Gnathopod 1 in S, 24 joint greatly expanded, 5th massive but much longer than broad, produced into a large tooth, flanked by a smaller one (Sowinski: wanting) within the palm, and a minute one at its base on the hind margin; 6tk joint rather slender, with hind margin extremely sinuous, not crenate; finger serrate, rather small. Gmnathopod 2 in d, 24 joint little expanded, 5tk and 6tk joints subequal, oblong, palm oblique, ill-defined, finger small. Gnathopod 1 in Q, 6% joint rather stout, a little longer than 5%, oblong, palm transverse, the rounded angle over- lapped by the finger. Gnathopod 2 in ©, 24 joint slender, 6tk stouter than in d and much longer than 5t", finger matching palm. Telson longer than broad, subelliptical with the apex feebly concave, without processes or setae. Colour blackish grey, except antennae and distal parts of limbs. L. 10—12 mm. Mediterranean (Naples, in fine sand, depth 10—20 m; Trieste); Black Sea, depth 23—105 m. 5. M. haswelli Stebb. 1879 Mierodeuteropus chelifer (non Stimpsonia cheli- fera Bate 1862!), Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.340 t.22 f.3 | 1882 Microdeutopus c., Haswell, Cat. Austral. Crust., p.265 | 1899 M. haswelli, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 350. Eyes small, round. Antenna 1 fully half as long as body, flagellum longer than peduncle, accessory flagellum 3-jointed. Antenna 2 subpediform, nearly as long as antenna 1, peduncle stout, flagellum shorter than ultimate joint of peduncle, obscurely multiarticulate. Gmathopod 1 in J very large, 24 joint apparently not expanded, 5tk massive, much longer than broad, widening distally, hind margin produced into a strong tooth, with a shorter and blunter one between it and the base of the 6! joint; 6tE joint very much smaller than 5t%, front margin convex, hind strongly concave, with small proximal tuberele; finger short, serrate. Gnathopod 2 small, 5tk joint ovate, 6% a little longer, palm undefined. Peraeopods 1 and 2 stout. Peraeopods 3—5, 24 joint long ovate, peraeopods 4 and 5 much longer than 34, Uropod 3 very small, rami short, subfoliaceous. Telson conical, armed above with a few slender hairs.. L. 5 mm. Port Jackson [East-Australia]. 6. M. anomalus (H. Rathke) 1843 Gammarus a., H. Rathke in: N. Acta Ac. Leop., v.201 p.68 t.4 f.7 | 1855 G@. (Gammaropsis) a., W.Liljeborg in: Vetensk. Ak. Handl., 1853 p.457 | 1859 Autonoe anomala, R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.25 t.1 f.4 | 1862 Microdeutopus anomalus, Bate, Cat. Amphip. Brit. Mus., p.379 | 1876 M..a., A. Boeck, Skand. Arkt. Amphip., v.2 p.567 t.25 f.5 | 1893 M..a. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.417 t.56 f.41 | 1894 M. a, G.O. Sars, Crust. Norway, v.1 p.540 t.191 | 1898 M.a., Sowinski in: Mäm. Soc. Kiew, v.15 p.480 t.10 f.20—24 | 1869 Microdeuteropus a., A.M. Norman in: Rep. Brit. Ass., Meet. 38 p.281 | 1856 Lembos cambriensis (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 L.c., Bate in: Ann. nat. Hist., ser.2 v.19 p. 142. Body very slender. Head, lateral lobes a little produced, rounded. Side-plate 1 sharply and much produced in J, quadrate in ©, with front 592 "Mierodeutopus angle not obtuse. Side-plate 2 deepest in d, 3Xin 9. Pleon segment 3, postero-lateral eorners subquadrate, not acutely. Eyes small, round, black with whitish eoating. Antenna 1 °/, as long as body; 24 joint considerably longer than 1%, about thrice as long as 34; flagellum much longer than pedunele, about 22-jointed (Bruzelius: 20— 28), accessory flagellum 3—5-jointed. Antenna 2 much shorter, ultimate joint of peduncle subequal to penultimate, searcely longer than the 8-jointed flagellum. Gnathopod 1 in JS, 24 joint not widened, having (in Sars’ figure) a small denticle on upper part of front margin, 5tk very large, but much longer than broad, hind margin produced to a strong tooth with secondary tooth at its base outside, this being accompanied by 1 or several small teeth (but only 1 in figures), 6!" joint narrow, with strongly ‚concave hind margin, angular near finger-hinge (Sars), or very sinuous, with distal half very convex, not angular (Sowinski); finger long, serrate. Gnathopod 2ind, 6% joint as long as 5tk, scarcely so wide, narrowly oblong, palm and finger very short. Gmathopod 1 in ©, 24 joint with smooth margins, 5 nearly as long as 6th, which widens a little to the slightly oblique palm, finger ‚overlapping palm. Gnathopod 2 in © nearly as in C, but smaller. Peraeo- pods 1 and 2 slightly armed. Peraeopods 3—5, 24 joint narrowly oblong, peraeopod 5 elongate, with the usual faseicle of setae at hind apex of 6 joint. Uropod 3, inner ramus rather the shorter, as long as peduncle. Telson a little longer than broad, apex slightly angular, with 3 slender spines on each side (Sars), or.convex between distinetly outdrawn subacute points (Sowinski). Colour whitish, sometimes with reddish tinge, mottled with dark brown spots in transverse bands. L. 6—9 mm. North-Atlantie (South-West-Norway, at least to Trondhjemsfjord, depth 11-56 m; Shetlands, depth 128—164 m); Black Sea, depth 54—64 m. 7. M. propinquus O0. Sars 1894 M. danmoniensis (err., non Lembos dam- nomiensis Bate 1856!), M. propingvus, G.O.Sars, Crust. Norway, v.1 p. 542; t.192 £.1. Closely allied to M. anomalus (p. 591), but differing at follows. Eyes rather larger, rounded oval. Antenna 1, flagellum little longer than peduncle, accessory flagellum of 2 equal joints. Gmathopod 1 in CS, tooth of 5 joint less elongate, the accessory tooth a little removed from it, 6% joint with hind margin less eoncave; gnathopod 1 in © less slender, 6% joint con- siderably longer than 5tk. Peraeopod 5 less elongate. Colour whitish, mottled with dark brown. L. d 5 mm. North-Atlantie (Norway). Very shallow water. 8. M. megnae Giles 1888 M.m., G. M. Giles in: J. Asiat. Soc. Bengal, v.57 pP-281 1.7 £.1-—4. Head without rostrum; lateral lobes obtuse, little prominent. Side- plates shallow, 1° not strongly produced, 34 deeper than 24 or 4, Pleon segment 3, postero-lateräl corners rounded. Eyes small, rounded, black. Antenna 1 about half as long as body, 24 joimt longer than 1%, 34 about !/, as long as 1%, flagellum much shorter than peduncle, 10—14-jointed, accessory flagellum very small, 1-jointed. Antenna 2 stouter than antenna 1, subequal in. length; ultimate joint of peduncle as long as penultimate, longer than flagellum of 10—12 very short joints. Mandible, 24 and 34 joints of palp subequal, neither much longer than the 1°. Gnathopod 1 im S, 24 joint much expanded, 5'% massive, longer than broad, hind margin produced into a slender tooth, 6% joint very short, nearly quadrangular, hirsute, finger strong and a little varieose, but otherwise unarmed. Gnathopod 2 in J short, slender, imperfeetly subchelate, 6% joint shorter than 5th, widening (in figure) to an Mierodeutopus 593 oblique palm; finger reaching the obtuse defining angle. Gnathopod 1 in o much smaller than in S, 6th joint larger than 5t%, palm feebly defined. Gnathopod 2 in © smaller and more slender than the 1%. Peraeopod 1 shorter than peraeopod 2; finger in both rather long and falciform. Peraeo- pods 3—5 as usual in the genus. Uropods 1—3 reaching about the same level; peduncle of uropod 3 extremely short. Telson short, armed above with a pair of peculiar conical protuberances bearing each a single strong bristle. Colour dirty white, somewhat pellueid. L. 4—5 mm. Bay of Bengal (Megna Shoals). Taken in the surface net, depth about 11 m. 9. M. versiculatus (Bate) 1856 Lembos v. (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.58 | 1857 L.v., Bate in: Ann. nat. Hist., ser.2 v.19 p.142 | 1862 Microdentopus v., Bate, Cat. Amphip. Brit. Mus., p.165 t.30 f.5 | 1895 Microdeutopus v., A.O. Walker in: Ann. nat. Hist., ser.6 v.15 p.469 | 1869 Microdeuteropus v., A.M. Norman in: Rep. Brit. Ass., Meet. 38 p. 282 | 1874 M. v., T. Stebbing in: Ann. nat. Hist., ser. 4 v.14 p.12 t.1 f.2,2a—f | 1876 Autono& longipes (part.)?, A. Boeck, Skand. Arkt. Amphip., v.2 p.574 | 1893 Microdeutopus anomalus (part.)?, A. Della Valle in: F. Fl. . Neapel, v.20 p.418. Head without rostrum, lateral lobes obtuse, little produced. Side-plate 1 acutely produced in d. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes rather large, dark. Antenna 1, 24 joint longer than 1, about twice as long as 34; flagellum 15-jointed, accessory flagellum 1-jointed. Antenna 2, ultimate joint of peduncle subequal to penultimate, rather longer than the 6-jointed flagellum. Gmathopod 1 in J massive, the bulk depending chiefly on the very broad and long 5tk joint, of which the hind margin is produced into a strong, slightly outward curving tooth; the small 6% joint, short and stout, with a median tubercle on the hind margin, elosely approxi- mates the tooth of the 5tt, which is erossed by the short serrate finger. Gnathopod 2 in S very slender, hirsute on 4—6th joints with long plumose setae, 4th acute at apex, 5th longer than 6%, together forming a geniculation, palm and finger very small. Gnathopod 1 in Q, 5#k joint rather longer than 6%, but about equal in breadth, palm rather oblique, feebly defined, over- lapped by finger. Gnathopod 2 in Q as in d. Peraeopods 1 and 2, 4th and 5th joints a little widened, finger nearly as long as 6!" joint. Peraeopods 3—5, 24 joint pretty well expanded; peraeopod 5 the longest. Uropod 3, rami little longer than pedunclee L. 4—5 mm. North-Atlantie and English Channel (Plymouth; Saleombe Harbour; Shetland, depth 128-146 m). 10. M. damnoniensis (Bate) 1856 Lembos d. (nom, nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 t.17 f.9 | 1857 L. d., Bate in: Ann. nat. Hist., ser.2 v.19 p. 142 | 1857 L. danmoniensis, A. White, Hist. Brit. Crust.. p. 180 | 1862 Miorodentopus gryllotalpa (err., non Microdeutopus g. A. Costa 1853!), Bate, Cat. Amphip. Brit. Mus., p. 163 t. 30 f.1| 1876 Microdeutopus g., A. Boeck, Skand. Arkt. Amphip., v.2 p. 565 | 1893. M. anomalus (part.) + M. algicola, A. Della Valle in: F. Fl. Neapel, v.20 p.417; p.418 t.1 f.3; t.11 f. 1—12. Distinguished from M. propinguus by the gnathopod 1 in CS, which has no accessory tooth on the 5% joint, and the 6!" joint of almost uniform breadth. Antenna 1, accessory flagellum with 1 (Bate) or 2 (Della Valle) joints. Lateral processes of telson rather prominently developed, with several setules on its sur- face. Colour greenish grey, with some black spots. L. 4+5—6 mm. English Channel (South England); Bay of Naples, among algae, Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 38 594 Mierodeutopus, Lembos M.titii Heller 1866 M. t., Cam. Heller in: Denk. Ak. Wien, %.2611 p.48 t.4 f.8 | 1893 M. t., A. Della Valle in: F. Fl. Neapel, v.20 p. 420. Perhaps identical with M. damnoniensis (p.593); but antenna 2 considerably longer than antenna 1. L. 5 mm. Adriatie (Pirano). 4. Gen. Lembos Baäte 1855 [Subgen.] Gammaropsis (part.), W. Liljeborg in: Vetensk. Ak. Handl., 1853 p- 455 | 1856 Lembos (nom. nud.) (part.), Bate in: Rep. Brit. Ass., Meet. 25 p. 58 | 1857 L. (part.), Bate in: Ann. nat. Hist., ser. 2 v. 19 p.142 | 1895 L., T. Stebbing in: Ann. nat. Hist., ser. 6 v.16 p.207 | 1859 Autonoe (part.), R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.8 or.1 p.23 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1081 | 1893 A., A. Della Valle in: F.Fl. Neapel, v.20 p.398 | 1894 Autonoe, G.O. Sars, Crust. Norway, v.1 p. 546, In general agreement with Aora (p. 587), also with well developed flagella of antenna 1, but in gnathopod 1 of the S the 4b joint is not elongate, the 5t" and 6th joints are stout, subequal in width, strongly setose, and the palm of the 6t% has tooth-like projeetions. In L. arctieus the maxilli- peds have the outer plates exceptionally small. 9 species accepted, 2 doubtful. Synopsis of accepted species: Without Haas of a; .. ii E .n an. 1. L. longidigitans . p.594 Not without trace of eyes — 2. Maxillipeds, outer plates very short; peraeopods 3—5, 24 joint very nartow. . . 2... 2. L. areticus. . . . p.5% Maxillipeds, outer plates not very short; peraeo- pods 3—5, 2d joint moderately narrow — 3. Ventral surface of peraeon armed with many spines 3. L. spiniventris. . p.59 Ventral surface of peraeon not armed with spines — 4. Peraeopods 1 and 2 in d both having 4th joint 0 VE TE 4. L. hirsutipes. . . p.596 Peraeopod 1, but not peraeopod 2, in S having | 4th joint strongly setose. .. .».. 2.2... 5. I. megacheir. . . p.596 1 2 3 4 Peraeopods 1 and 2 in & neither having 4th joint strongly setose — 5. Gnathopod 1 in 3, 2d joint densely setose at lower N RE E e a 6. L.longipes . . . p. 597 Gnathopod 1 in 3, 24 joint not ee setose at lower hind corner — 6. Lower lip, hind processes very long; mandible, spines of spine-row very numerous . . .. .- 7. L. philacanthus . p.598 Lower lip, hind processes of moderate length; ; mandible, spines of spime-row in moderate number — 7. Gnathopod 2, 24 joint strongly dilated. . ... . 8. L. kergueleni . . p.598 ? Gnathopod 2, 24 joint not dilated . .... .. 9. L. websterii.. . . p.599 1. L. longidigitans (Bonnier) 1896 Autonoe l., J. Bonnier in: Ann. Univ. Lyon, v.26 p. 659 t.40 f.1 | 1899 Lembos l., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.350. Head without rostrum, lateral lobes not at all prominent. Side-plate 1 in J quadxate. Pleon segment 3, postero-lateral corners much rounded. ED a be an 1 a en AL un u An a A a LK" ar A ne a DA A u si m ME Die me Lembos 595 Eyes and eye-pigment entirely wanting. Antennae 1 and 2 broken. Man- dible, 34 joint of palp longer than 24, distal margin concave. Gmnathopod 1 in d, 24 joint stout except proximally, 5tt and 6!" nearly equal in width and length, palm towards the middle emarginate and raised into a strong tooth, finger shorter tban 6!" joint but much overlapping palm. Gmnatho- pod 2 ind much smaller, 24 joint little dilated, 6" joint rather larger than 5t", finger a little overlapping the palm. Gnathopod 1 in O, 24 joint not dilated, 6tk wider than 5th, palm very oblique and ill-defined. Gnatho- pod 2 in Q nearly as in J, but shorter, palm more transverse. Peraeopods 1 and 2 slender, little setose, 24—5tb joints glandular, finger long, as long as 6th joint. Peraeopods 3—5, 24 joint oval; peraeopod 5 elongate. Uropod 3, rami nearly equal, little longer than peduncle. Telson rounded oval, with setules at each lateral process. L. about 6 mm. Bay of Biscay. Depth 950 m. 2. L. arcticus (H.J. Hansen) 1887 Microdeutopus a., H.J. Hansen in: Dijmphna Uab., p.231 t.22 £.3 | 1894 M. a., T. Stebbing in: Bijdr. Dierk., v.17 p.48 | 1893 Au- tonoe arctica, A. Della Valle in: F. Fl. Neapel, v.20 p. 406 t.56 f. 35, 36 | 1895 Lembos arcticus, T. Stebbing in: Ann. nat. Hist., ser. 6 ®.16 p. 207. Side-plate 1 rather smaller than 24, its apex acute, not aculeate, 24 —4th rotundo-quadrate, 5th nearly as deep as 4th, with shallow straight hind lobe. Pleon segment 3, postero-lateral corners quadrate, in 4" produced to a small tooth. Eyes very small. Antenna 1 not reaching end of 34 pleon segment, 24 joint longer than 1°, 34 short, flagellum much longer than peduncle, 35-jointed; accessory flagellum 7-jointed. Antenna 2 about !/, as long as antenna 1, ultimate joint of peduncle shorter than penultimate, but at least as long as the 7-jointed flagellum. Mandible, 34 joint of palp considerably longer than 24. Maxillipeds, outer plates much smaller than is usual in the genus. Gnathopod 1, 5" joint shorter than 6®h, rather broad except at base, hind margin setose, 6% with groups of setae on distal half of front, and along hind margin, widening to and at the convex transverse palm, this being sharply defined by a small acute tooth, which is crossed by the apex of the finger. Gnathopod 2, 5th joint setose, wider but rather shorter than the narrowly oblong and very setose 6", which has a short transverse palm, overlapped by the denticulate, spinulose finger. Peraeopods 1 and 2 rather slender, 4! joint rather longer than 5t%, 6fh Jonger than 5tk and much more slender, finger slender, acute. Peraeopods 3—5, 24 joint very narrow; peraeopod 4 much longer than 34, 5" than 4, Uropods 1 and 2, rami equal in length, in uropod 2 one stouter than the other. Uropod 3, peduncle short, pentagonal; inner ramus a little longer than the outer. Telson, upper half semicircular, lower triangular, with strong prominence on each side of the base of the triangle, carrying 3 unequal setules. Colour whitish, with 4 longitudinal rows of brown grey blotches. L. 29 mm. Kara Sea (lat. 70° N.). Depth 37—-96 m. 3. L. spiniventris (Della Valle) 1893 Autonoe s., A. Della Valle in: F. Fl. Neapel, v.20 p.400 t.5 £.7; 1.56 £.17—84 | 1895 Lembos s., T. Stebbing in: Ann. nat. Hist., ser. 6 v.16 p. 207. “ Body moderately robust, peraeon segments 1 and 2 narrow, ventral surface of peraeon armed with many large spines (only in C?). Head short with straight, very acute. rostrum. Side-plate 1 in d, front angle very acutely prolonged, in Q subacute, in side-plate 2 in S acute, not much prolonged, in © blunt; side-plate 5 notably less deep than 4". Eyes brown. 38* 596 Lembos Antenna 1, 1° joint °/, as long as 24, 34 Jess than half as long as 1%, flagellum longer than pedunele, 20-jointed, accessory flagellum 8-jointed. Antenna 2 shorter, ultimate joint of peduncle as long as penultimate, longer than the 8-jointed flagellum. Upper lip semiecircular. Mandible, 34 joint of palp longer than 24. Maxillal, inner plate rudimentary, without setules. Maxillipeds, outer plates rather large, strongly armed. Gnathopod 1 in J, 5tk joint a little shorter than 6th; 6th oval, palm slightly oblique, well defined, but without a tooth, a small cavity occupying about '/, of its length adjacent to the defining angle, which is slightly overlapped by the serrate finger. Gnatho- pod 2 in JS rather smaller, similar, except that the palm is more oblique,- simply and slightly convex. Gnathopod 1 in O, palm straight, oblique, otherwise nearly as in d. Gnathopod 2 in Q narrower than gnathopod 1, palm less oblique. Peraeopods 1 and 2 as in L. arcticus (p. 595), or finger rather longer. Peraeopods 3—5 as in L. arctieus, except that the 24 joint is rather more expanded, especially in peraeopod 5. Pleopods 1—3, peduncle rather large, outer ramus the shorter. Uropod 3, peduncle short and stout, rami twice as long as peduncle, nearly equal. Telson longer than broad, a setule in the indent on each side of rounded apex. Colour, bands of rose alternating with sulphur-yellow or white. L. 5—7 mm. Bay of Naples. Depth 10—20 m. 4. L. hirsutipes Stebb. 1895 L.h., T. Stebbing in: Ann. nat. Hist., ser.6 v.16 p. 207 t.8, t.9B. Side-plate 1 in S subacutely produced, in Q subrhomboidal. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes small. Antenna 1, 15t joint rather long, rest unknown. Antenna 2, antepenultimate joint of peduncle much thicker than penultimate, ultimate rather shorter than penultimate and longer than the 4- or 5-jointed flagellum. Gmathopod lin J, 24 joint with brush of long setae at hind distal end; 5" joint nearly as broad as 6!" but con- siderably shorter; 6% broad, oblong, palm transverse with deep narrow cleft between a submedian tooth and the rather long and sinuous defining tooth, beyond which the apex of the denticulate finger projects. Gnathopod 2 ind, 24 joint somewhat expanded, oval; 5tk joint rather longer and broader than the oblong 6*R, both setose on both margins, the 5th having a group of very long ° setae at the hind apex, and the 6! many such along the front; palm short, not sharply defined, overlapped by the finger. Gnathopod 1 in ©, 24 joint slender, unarmed, 6th joint much longer than 5t" and slightly broader, palm with a little triangular indentation. Gnathopod 2 in Q, 24 joint slender, other joints nearly as in 9, but 5!" and 6tk much more sparsely furnished in front though similarly on the hind margin. Peraeopods 1 and 2 in JS, but not in O,having the large 4th joint on both margins densely fringed with long simple setae. Peraeopod 3, 24 joint moderately expanded, 6! longer than 4th or 5th, slightly eurved, reverted; finger short. Peraeopod 4 longer, 6! joint straight, not reverted, finger short. Peraeopod 5? Pleopods 1—3, outer ramus much shorter than inner, both with 10 joints. Uropod 3, rami equal. Telson as long as broad, with 2 setae at each lateral process, apex rounded. L. 4 mm. Off Cape of Good Hope. 5. L. megacheir (0. Sars) 1879 Autono& m., G.O. Sars in: Arch. Naturv. Kristian., v.4 p.458 | 1894 A. m., G. O. Sars, Crust. Norway, v.1 p.550 t.195 f.2 | 1895 Lembos m., T. Stebbing in: Ann. nat. Hist., ser.6 v.16 p.207 | 1893 Autonoe longipes (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 408. ; 3 F . ee Va a € A Se ze a ET a EEE Be FR Fi yon RE - 2 ne Br Me Lembos . | 597 Body rather slender, near to L. longipes. Side-plate 1 as in J and © of L. spiniventris (p. 595), 2—4th rotundo-quadrate, 5th nearly as deep as 4th, Pleon segment 3, postero-lateral corners subquadrate. Eyes without visual elements, represented by patch of whitish pigment on each side. Antenna 1 slender, nearly as long as body, 24 joint much longer than 1°, thrice as long as 34, flagellum nearly twice as long as peduncle, about 20-jointed, accessory flagellum 4-jointed. Antenna 2 little over half as long as antenna 1, ulti- mate joint of peduncle as long as penultimate, longer than flagellum. Gnatho- ‚pod 1in d, 24 joint with tuft of short setae at lower hind corner; 34—5th .densely setose only along hind margin; 5th a little shorter than 6th; 6th broad, ' oblong oval, but with nearly transverse palm, defined by a sharp tooth separated from a submedian angle by an excavation; apex of finger crossing the defining tooth. Gnathopod 2 in CS slender, the rather long and narrow 5th and 6tk joints densely setose on both margins, especially the front, palm short, slightly oblique, matching finger. Gnathopod 1 in ©, palm oblique, not strongly defined. Gnathopod 2 in O much smaller than gnathopod 1, ‘shaped as in the 9, but slightly furnished on front margin. Peraeopod 1 in S, but not peraeopod 2, having 4% joint densely setose on both margins, but especially on the front. Peraeopods 3—5, 24 joint little expanded; peraeo- pod 5 very elongate in d and 9. Uropod 3, inner ramus somewhat larger than the outer. Telson with a setule on either side of the apex. Colour uniformly yellowish. L. d 8 mm. Arctic Ocean, North-Atlantie and North-Sea (Norway Fam Stavangerfjord up to Finmark). Depth 94—564 m. 6. L. longipes (Lilj.) 1852 Gammarus 1., W. Liljeborg in: Öfv. Ak. Förh., v.9 p. 10| 1855 @. (Gammaropsis)l., W.Liljeborg in: Vetensk. Ak. Handl., 1853 p.457 | 1859 Autonoel., R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.28 | 1893 4.1. (part.), A Della Valle in: F. Fl. Neapel, v.20 p.403 | 1894 Autonoe l., G. O. Sars, Crust. Norway, v.1 p.549 t.195 f£.1 | 1895 A.1., A. M. Norman in: Ann. nat. Hist., ser.6 v.15 p. 490 | 1862 Microdentopus 1., Bate, Cat. Amphip. Brit. Mus., p.166 | 1895 Lembos I., T. Stebbing in: Ann. nat. Hist., ser. 6 v.16 p.207 | 1871 Autonoe plumosa, A. Boeck in: Forh. Selsk. Christian., 1870 p.239 | 1876 Autono& longipes (part.) + A.p., A. Boeck, Skand. Arkt. Amphip., v.2 p.572 t.25 f.2; p.574 t.25 f.3. « Body more slender and side-plate 1 in less produced than in L. websterii (p. 599). Pleon segment 3, postero-lateral corners rotundo-quadrate. Eyes small, rounded, black. Antenna 1 about °/, as long as body, 24 joint much longer than 15, thrice as long as 3; flagellum longer than peduncle, about 18-jointed; accessory flagellum 3- or 4-jointed. Antenna 2 much shorter, ultimate joint of peduncle as long as penultimate, rather longer than the 6-jointed flagellum. Gnathopod 1 in 9, 24 joint broad, with dense brush of long setae at lower hind corner, 4 and 5th with faseiecles of setae on hind margin, 5th fringed only on distal part of front margin, 6 all along it; 6tk longer than 5th, oblong oval; palm bidentate but oblique, so that the tip of the larger defining tooth does not reach the level of the smaller inner tooth. Gnathopod 2 in CS nearly as long as gnathopod 1 but much more slender, 5t" joint longer than 6*#, both long and setose, especially on the front margin; palm short, rather oblique. Gnathopod 1 in O not robust, 6th joint rather longer than 5, widening a little to the rather oblique palm, defined by an obtuse angle and slender spine. Gnathopod 2 in O rather more slender, 6" joint subequal to 5%, narrow, palm almost transverse. Peraeopods 1—5 slightly armed. Peraeo- pods 3—5, 24 joint oblong oval. Peraeopod 5 much the longest. Uropod 3, 598 Lembos rami subequal, nearly twice as long as peduncle. Telson rounded oval, somewhat tapering, with 2 or 3 setae on each side of apex. Colour whitish, with light reddish transverse bands, but no specks. L. reaching nearly 12 mm. Kara Sea; Kattegat; North-Atlantie, North-Sea and Skagerrak (South- and West-Norway at least to Trondhjemsfjord). Depth 19—274 m. 7. L. philacanthus (Stebb.) 1888 Autonoe philacantha, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1082 t.110 | 1895 Lembos p., T. Stebbing in: Ann. nat. Hist., ser.6 v.16 p.207 | 1893 Autonoe longipes (part.)?, A. Della Valle in: F. Fl. Neapel, 0.20 p. 405. Head, rostrum scarcely perceptible; lateral lobes small, acute. Side- plate 1 small, not produced forward. Pleon segment 3, postero-lateral eorners. rounded. Eyes small, narrow, reniform, set obliquely on lateral lobes of head. Antenna 1, 1° joint longer than head, 24 much longer than 1%, 34 scarcely '/, as long as 1%; flagellum longer than peduncle, more than 18-jointed; aecessory flagellum 7-jointed. Antenna 2 shorter, ultimate joimt of peduncle about as long as penultimate, scarcely so long as the 9-jointed flagellum. Upper lip, distal margin almost straight. Lower lip (Fig. 102), mandibular process thin and unusually long. Mandible, spine-row of 12 spines, molar with accessory process; 39 joint of palp rather shorter than 24, with dense group of pectinate spines and cilia near the middle. Maxilla 1, inner plate with 1 plumose seta. Maxillipeds, inner and outer plates broad, Mandibular wellarmed. Gnathopod 1, 24 joint devoid of PROF Jong setae; 5thand 6th joints massive, spinose, 5th rather longer than broad, rather shorter than 6%", whieh has the hind margin much shorter than the convex front; palm oblique, sinuous, finely but irregularly denticulate, defined by a tooth serrate on the inner side and there carrying a long palmar spine, the sharp apex of the curveä serrate finger elosing against this on to the surface of the joint. Gnathopod 2 smaller, 6% joint as long as 5th, almost oblong; palm nearly transverse, slightly sinuous, finely pectinate, well defined, the specimen having a palmar tooth m only one of the 24 gnatho- pods; finger serrate, matching palm. Peraeopods 1 and 2, 24and 4% joints glandular, 4% much longer than 5tk or 6th, feebly armed; finger short. Peraeopods 3—5, 24 joint little expanded. Uropods 1—3 spinose, uropod 2 stout, 3% with short peduncle, inner ramus the longer. Telson scarcely longer than broad, with 5 setiform spines at each subapieal corner. L.J (?) about 11mm. Bass Strait (East Moneoeur Island). Depth 71 m. Fig. 102. L. philacanthus. Lower lip. 8. L. kergueleni (Stebb.) 1888 Autonoe k., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1087 t.111 | 1895 Lembos k., T. Stebbing in: Ann. nat. Hist., ser. 6 v.16 p.207 | 1895 Autonoe longipes (part.)?, A. Della Valle in: F. Fl. Neapel, «.20 p.405.- Head with small rostrum; lateral lobes little produced, acute. Side- plate 1 obtusely produced. Pleon segment 3, postero-lateral eorners minutely notched, border above bulging. Eyes small. Antenna 1, 1% joint longer. than head; rest unknown. Antenna 2, antepenultimate joint of peduncle broad, ultimate joint of peduncle as long as penultimate, rather longer than the 7-jointed flagellum. Lower lip, mandibular process rather long, acute. Mandible, spines of spine-row 5 or 6; 34 joint of palp fully as long as 24. Other mouth-parts nearly as in L. philacanthus. Gnathopod 1 not very setose, Le a a u a VB SE ana Fa Velen d net "Ser Bea Pia FI ee Lembos 599 „such fascieles as there are being chiefly on hind margin of 3d—6tk joints; 5th joint stout, much shorter than 6%, which widens a little to the transverse bidentate palm, the defining tooth separated by a cavity from a smaller submedian tooth, between which and the finger-hinge the palm is sinuously ‚denticulate; apex of almost smooth finger elosing against inner margin of the defining tooth. Gnathopod 2 narrower, except the broadly expanded, oval 24 joint; 5tk broader than 6%, a little shorter, with long setae fringing distal 2/, of front; 6 oblong, the rather convex front margin strongly fringed; palm pectinate, almost transverse, defined by obtuse angle and 'palmar spines, a little overlapped by the short, stout, serrate finger. Peraeo- pods 1 and 2 slightly armed. Peraeopods 3—5, 24 joint not much expanded; 'peraeopod 4 much longer than 34, 5th than 4th; finger not long. Uropod 3, rami short, subequal, longer than pedunele. Teison oval, narrowing distally, ‘with a seta at the notch on each side of the rounded apex. L. about 5 mm. Cumberland Bay [Kerguelen Island]. Depth 239 m. 9. L. websterii Bate 1856 L. w. (nom. nud.), Bate in: Rep. Brit. Ass., "Meet. 25 p.58 | 1857 L. w., Bate in: Ann. nat. Hist., ser.2 v.19 p.142 | 1895 L. w., ‘T. Stebbing in: Ann. nat. Hist., ser.6 v».16 p.207 | 1862 Microdeutopus w., Bate & Westwood, Brit. sess. Crust., v.1 p.291 f. | 1862 Microdentopus w., Bate, Cat. Amphip. - Brit. Mus., p.164 t.30 f.2 | 1869 Microdeuteropus websteri, A.M. Norman in: Rep. Brit. ‚Ass., Meet. 38 p. 282 | 1887 Microdeutopus w., Chevreux in: Bull. Soe. zool. France, v.12 p-312 | 1894 Autonoe w., G.O. Sars, Crust. Norway, v.1 p.547 t.194 | 1876 Microdeuteropus ' ‚bidentatus, T. Stebbing in: Ann. nat. Hist., ser.4 0.17 p.78 t.4 £.1a; t.5 f.1, 1b | 1876 Autono& longipes (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.572 | 1893 Autonoe I. «(part.), A. Della Valle in: F. Fl. Neapel, v.20 p.403 t.3 £.13; t.10 f. 20—30. Body rather tumid in ©. Side-plate 1 in J acutely produced, in © ‚subrhomboidal. Pleon segment 3, postero-lateral corners rotundo-quadrate. Eyes very small, rounded oval, dark. Antenna 1 more than '/, as long as body, 24 joint longer than 1°, not thrice as long as 34, flagellum longer than peduncle, with about 15 joints, accessory flagellum with 4 or 5 joints, last minute. Antenna 2 much shorter, ultimate joint of peduncle as long as penultimate, longer than the 4- or 5-jointed flagellum. Gnathopod 1 in 9, 24 joint without brush of long setae at lower hind corner; 4 and 5th with long setae on hind margin; 5!" and 6tk densely fringed on convex front margin, both stout, subequal: palm transverse, defined by a strong 'tooth, separated by a cavity from a smaller inner one, while on the outer side a palmar spine springs from a small prominence (Della Valle: a little 'tooth); the serrate finger reaching the tip of the spine. Gnathopod 2 in G, 22 joint with lower front corner a little produced outward; 5th and 6®h jointg long and narrow, densely fringed on both margins, especially the front, palm :short, nearly transverse, a little overlapped by the short finger. Gnathopod 1 in ©, 6 joint much longer than 5t", oblong oval, palm ill-defined, finger serrate. Gmnathopod 2 in © much smaller, similar to gnathopod 2 in GC, but smaller, corner of 24 joint not produced, front of 5t",and 6% not densely fringed. Peraeopods 1 and 2 slightly armed. Peraeopods 3—5, 24 joint ‘oblong oval, not very broad; peraeopod 5 much the longest. Uropod 3, rami nearly equal, not much longer than peduncle. Telson rounded oval, with 3 spines on each side of the somewhat angular tip. Colour whitish, "with narrow transverse bands of dark brown specks. L. 5—6 mm. North-Atlantie with adjoining seas (south and west of Norway, north and south of ‘Great Britain, France); Mediterranean (Naples). Generally in comparatively shallow water. 600 Lembos, Lemboides L. fuegiensis (Dana) 1853 & 55 Gammarus f., J. D. Dana in: U. S. expl. Exp., e.1311 p. 954; t.65 f.8a—h | 1862 Moera f., M. fuegeensis, Bate, Cat. Amphip. Brit. Mus., p.194 t.35 f.4 | 1893 Microdeutopus (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.425. L. 7 mm. South-Paeific? (Feejee Islands). L. tenuis (Dana) 1852 Gammarus t., J. D. Dana in: P. Amer, Ac., v.2 p.211| 1853 & 55 @. t., J. D. Dana in: U. S. expl. Exp., v. 13u p.950; t.65 f.5a—e | 186% Microdentopus t., Bate, Cat. Amphip. Brit. Mus., p. 165 t. 30 f.4 | 1893 Microdeutopus t.,. A. Della Valle in: F. Fl. Neapel, v.20 p. 420 | 1894 Autono&? t., &. O. Sars, Crust. Norway, v.1 p. 547 | 1895 Lembos? t., T. Stebbing in: Ann. nat. Hist., ser. 6 ©. 16 p. 207. L. 6 mm. Sooloo Sea. Depth 12 m. 5. Gen. Lemboides Stebb. 1895 Lemboides (Sp. un.: L. afer), T. Stebbing in: Ann. nat. Hist., ser. 6 0.16 p.209. Like Lembos (p. 594), but aeccessory flagellum of antenna 1 shorter thanı 34 joint of pedunele, and in gnathopod 1 of the J the 5th joint is much broader and longer than the 6", though not dentate or opposable to the finger. 2 species. Synopsis of species: Antenna 1, 2@ joint not longer than 1t ......... 1 Lafer... . p.600 Antenna 1, 24 joint much longer than 1 ........ 2. L. australis . p. 601 1. L. afer Stebb. 1895 L. a., T. Stebbing in: Ann. nat. Hist., ser.6 v.16 p.209 t. 9a, 10. Side-plate 1 in J broader but rather less deep than the following, not. acuminate; no side-plate very large. Pleon segment 3 large, postero-lateral corners rounded. Eyes small, dark. Antenna 1 about '/, as long as body, 1° joint slightly longer than 24; 34 about '/, as long as 24; flagellum rather longer than peduncle, about 15-jointed; accessory flagellum not as: long as 1° joint of primary, with 2 joints, 24 minute. Antenna 2 shorter, antepenultimate joint of peduncle as long as broad, with expansion of lower‘ edge, ultimate joint of peduncle shorter and much narrower than penultimate, longer than the 3- or 4-jointed flagellum. Gnathopod 1 in d, 4tk joint. acute, 5'% much broader than 24 and as long, distal margin straight, not covered by base of 6tk joint, of which the palm is rather oblique, having a broad dentieulate cavity between a strong tooth near the finger-hinge and: a smaller one near to a still smaller defining tooth, against which the serrate finger impinges. Gmnathopod 2 in d more slender, otherwise rather like gnathopod 1, but 5t% joint not broader than 24; 6th shorter and rather narrower than 5t%; both plumose; the palm forming a small cavity between a tooth near the finger-hinge and the defining point, which the rather short finger just reaches. Gmathopod 1 in Q, 5tk joint densely setose on hind- margin, only a little longer and broader than the 6%, which is setose on both margins and has a short palm, overlapped by the serrate finger. Gnatho- pod 2 in 9 with long plumose setae along the front, 5tk joint distally widened,. 6th longer, narrow, the small finger fitting the short convex palm. Peraeo- pod 1, 4th joint plumose on front margin, more so than in peraeopod 2. Uropods 1-—3, outer ramus shorter than inner; inner ramus of uropod 2 Lemboides, Dryopoides 601 stoutest of all. Telson as long as broad, lateral processes of shallowly rounded apex each with 5 spinules. L. about 6 mm. Off Cape of Good Hope. 2. L. australis (Hasw.) 1879 Microdeuteropus a., Haswell in: P. Linn. Soe. N.S. Wales, v.4 p.271 t.11 f.5 | 1882 Microdeutopus a., Haswell, Cat. Austral. Crust., p.263 | 1888. Autonoe a., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1087 | 1899 Lemboides a., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.350 | 1893 Autonoe longipes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 403. Antenna 1 longer than head and peraeon; 24 joint twice as long as 1st, 34 very short; flagellum longer than peduncle, accessory flagellum small (in figure). Antenna 2 nearly °/, as long as antenna 1, ultimate joint of pedunele shorter than penultimate, longer than flagellum, which is armed with hooked setae. Gmathopod 1 large, subchelate; 4!" joint small, narrow; 5th Jarge, armed with a few scattered hairs; 6% smaller (in figure much smaller), irregularly quadrate, rather longer than broad, palm scarcely oblique, deeply excavate, denticulate, defined by a triangular tooth; finger stout, dentieulate, apex (in figure) reaching rather beyond the short palm. Gnatho- pod 2 smaller; 5tk and 6*" joints subequal, with fascieles of setae along bind margin; sth joint ovate (in figure oblong), twice as long as broad; palm not defined, nearly transverse; finger stout, short, denticulate. Peraeo- pod 2 longer than peraeopod 1; finger in both long, slender. Uropod 3, ‘- rami shorter than in uropods 1 and 2, lanceolate. Telson large, armed with a few short hairs. L. 7 mm. Port Jackson [East-Australia]. 6. Gen. Dryopoides Stebb. 1888 Dryopoides (Sp. un.: D. westwoodi), T. Stebbing in: Rep. Voy. Challenger, v.29 p.1145 | 1890 Dryapoides, Warburton in: Zool. Ree., v.25 Crust. p.19. Like Lembos (p. 594), except that the accessory flagellum of antenna 1 is minute, and that the 2 rami of uropod 3 are rudimentary, pleon segment 6 dorsally evanescent. 1 species. 1. D. westwoodi Stebb. 1888 D.w., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1146 t. 122 | 1889 D. w., J. Bonnier in: Bull. sei. France Belgique, v.20 p.391 | 1893 D. w., A. Della Valle in: F. Fl. Neapel, v.20 p.425 | 1890 Dryapoides westwoodii, Warburton in: Zool. Rec., v.25 Crust. p.19. Back not much arched, pleon segment 4 as long as any preceding segment. Head, lateral lobes somewhat produced, marrowly rounded. Side- plates 1—5 not very deep; 1° produced forward, 24 deeper than broad, 5th much broader than deep, nearly as deep as 4{h, Pleon segment 3, postero-lateral corners rounded. Eyes round, rather large, a little removed from lateral lobes of head. Antenna 1 as long as body, slender, 1° joint longer than head, 24 longer than 1%, 34 about '/, as long as 24; flagellum much longer than pedunele, about 30-jointed; accessory flagellum with 2 joints, 1° small, 24 minute. Antenna 2 shorter, but with much longer peduncle, ultimate joint of peduncle longer than penultimate or than the 8-jointed flagellum. Gnathopod 1, 5th joint rather shorter than the oval 6tk, which has the palm in © scarcely distinet from hind margin, but in J apparently somewhat 602 Dryopoides, Paradryope excavate; finger matching palm, with many decurrent teeth on its inner margin. Gnathopod 2 smaller, 5th joint as long as 6th, and distally a little wider, 6! narrowly oblong, palm transverse, very short, convex, just over- lapped by the short finger. Peraeopods 1 and 2 very glandular; 24 and 4th joints rather robust; finger more than half as long as 6% joint. Peraeo- pods 3—5, 24 joint oblong, not much expanded. Peraeopod 4 longer than peraeopod 3, and peraeopod 5 than peraeopod 4; finger in each with inner margin furred, produced into a blunt process carıying a plumose seta, which overlaps the apex. Uropods 1 and 2, peduncle longer than the rami, which in each are subequal, spinose, blunt. Uropod 3, peduncle short, broad, just reaching beyond the telson; the diminutive rami equal, narrowly oval, inner armed with 3 plumose spinules, outer with a longer apical spine and a spinule above it. Telson broader than long, its distal arch ending in a slightly produced blunt point; on each side not far from lateral margins there is a group of plumose setae. L. about 8 mm. Off Melbourne. Depth 62 m. 7. Gen. Paradryope Stebb. 1888 Paradryope (Sp. un.: P. orguion), T. Stebbing in: Rep. Voy. Challenger, v.29 p.1151 | 1893 Ischyrocerus (part.)?, A. Deila Valle in: F. Fl. Neapel, v.20 p.451. Pleon segment 6 dorsally well developed. Side-plates shallow. Antennae 1 and 2 with peduncle elongate. Antenna 1, 3% joint of peduncle longer than 24 or 1°, accessory flagellum small. Mandibular palp very elongate. Gnatho- pod 1 larger than gnathopod 2. Peraeopods 1—5, 24 joint little expanded; peraeopod 5 the longest. Uropods 1 and 2, outer ramus considerably shorter than inner. Uropod 3, rami almost rudimentary, outer a little longer than inner. Telson simple. - 1 species. 1. P. orguion Stebb. 1888 P.o., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1151 1.128. Back rather broadly rounded. Head, rostrum short, acute; lateral lobes acute, a little produced. Side-plates 1—4 little deeper than the following; 5tk and 6" apparently with an acute hind lobe. Pleon segment 3, postero-lateral eorners rounded. Eyes small, round, near the lateral lobes of head. Antennae 1 and 2 elongate. Antenna 1, 1° joint rather longer than head; 24 considerably longer than 1%, 34 a little longer than 24; flagellum shorter than peduncle, 8-jointed; accessory flagellum 1 slender joint. Antenna 2 rather longer, ultimate joint of peduncle a little longer than penultimate; flagellum 9-jointed. Gnathopod 1, 24 joint shorter and very much narrower than 6%; 5tk rather longer than broad, much shorter and narrower than the very large, oval 6%, of which the oblique palm is strongly sculptured, with eavities separating a small submedian process from the finger-hinge and from a large tooth, dentieulate on the edge which unites . with the hind margin of the joint, the dentate finger elosing over this edge against strong palmar spines. Gnathopod 2 smaller, but with longer 5th joint, which is as long as the 6t"; 6th oval, rather stout, palm not very oblique, eonvex, finely pectinate, finger slightly denticulate, elosely fitting palm. Peraeopods 1—5 not greatly differing in length; peraeopod 3 scarcely as long as 1% or 24, none of the joints much widened. Uropods 1 and 2, a EI I a EZ Ga a a Ma ee a Fa u -r Paradryope, Photidae __. 603 ‘outer ramus shorter than inner. Uropod 3, peduncle broad, reaching well beyond the telson, rami narrow, almost acute. Telson a little longer than broad, apex obtuse, a little produced; a spinule near centre of each Iateral margin. L. about 5 mm. North-Paeifie (lat. 36° N., long. 158° E.). Depth of 4200 m. 34. Fam. Photidae 1872 & 76 Photidae (part.), A. Boeck, Skand. Arkt. Amphip., v.1 p.74; v.2 p.546 | 1882 P., 6. O.Sars in: Forh. Selsk. Christian., nr. 18 p.29 | 1888 P. (part.), T. Stebbing in: Rep. Voy. Challenger, v.29 p.1061 | 1894 P. (part.), G. O. Sars, Crust. Norway, v.1 p. 538. Head, lateral lobes often slightly produced. Side-plates variable in depth and relative size, 24 not unfrequently the largest, 4" with hind margin ‘ not excavate. Antenna 1: often subequal to antenna 2, sometimes longer; accessory flagellum varying from obsolete to long. Mouth-parts normal and in general as in the Aoridae (p. 585), but: mandibular processes of lower lip not acutely produced, 34 joint of mandibular palp usually not longer than 24, inner plate of maxilla 1 with a variable number of setae. Gnatho- pods 1 and 2 (Fig. 104, 105, 107; p. 610, 614) either subchelate or simple, but gnathopod 1 not the larger, and sexual difference chiefly affecting gnathopod 2. Peraeopods 1 and 2 (Fig. 106 p. 613) glandular. Peraeo- pods 4 and 5 longer than, the rest. Uropods 1 and 2 biramous. Uropod 3 biramous except in ih aa (p. 604). Telson simple (Fig. 103 p. 607). Marine. 10 genera, 38 accepted species and 5 doubtful. Synopsis of genera: ‚J Uropod 3 with only Il ramus........ 1. Gen. Mieroprotopus . p. 604 \ Uropod 3 with 2 rami — 2. Uropod 3 (Fig. 103) with one ramus much 2 smaller than the other — 8. Uropod 3 with the rami not very unequal — 4. 3 Gnathopods 1 and 2 subchelate ...... 2. Gen. Photis. . ... - p- 605 Gnathopods 1 and 2 (Fig. 104, 105) simple . 3. Gen. Haplocheira . . p.609 Antenna 1, 3d joint longer than 1st or sn 4 to it — 5. Antenna 1, 3d joint shorter than 1st — 7. j Antenna 1, accessory flagellum well developed 4. Gen. Eurystheus . . p.610 5 % Antenna l, accessory flagellum rudimentary or | obsolete — 6. 6 { Gnathopod 2, 5th joint short... ..... 5. Gen. Podoceropsis. . p. 618 Gnathopod 2, 5th joint long...» 2... 6. Gen. Megamphopus . p. 621 + [ Antenna 1, accessory flagellum obsolete. . . 7. Gen. Goösia. . - . - p- 622 Antenna 1, accessory flagellum developed — 8. 604 Photidae, Mieroprotopus 8 Gnathopod 2 subehelate. . . ... 2... 8. Gen. Protomedeia . . p. 623 Gnathopod 2 simple — 9. kha’Trank Ense a NE » 9. Gen. Xenocheira . . p. 624 Gnathopod 2, 5th joint broadiy expanded to 9 | Gnathopod 2, 5th joint not broadly expanded . 10. Gen. Leptocheirus. . p. 625 1. Gen. Microprotopus Norm. 1852 Dercothoe (part.), J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.313 | 1853 D. (part.), J. D. Dana in: U. S. expl. Exp., v. 1311 p. 911, 968 | 1867 Microprotopus (Sp. un.: M. maculatus), A. M. Norman in.: Rep. Brit. Ass., Meet. 36 p.197,203 | 1893 M., A. Della Valle in: F. Fl. Neapel, v.20 p.391 | 1894 M., G. O. Sars, Crust. Norway, v.1 p. 566 | 1879 Orthopalame (Sp. un.: O. terschellingi), Hoek in: Tijdschr. Nederl. dierk. Ver., v.4 p. 123. Head, lateral lobes moderately produced, post-antennal corners well marked. Side-plates rather large, 5tt with deep front lobe. Antennae 1 and 2 not very elongate, nor very unequal. Antenna 1 with accessory flagellum. Gnathopod 2 especially large in the d. Peraeopods 1 and 2, 24 joint a little expanded. Peraeopods 3—5, 24 joint broadly oval.- Uropod 3 ' with a single ramus tipped with spines. Telson small. 2 species accepted, 3 obscure. Synopsis of accepted species: Antenna 2, flagellum more than 3-jointed : ...... 1. M. maculatus. . p. 604 Antenna 2, flagellum not more than 3-jointed . . .. . 2. M. longimanus . p.605 1. M. maculatus Norm. 1867 M.m., A. M. Norman in: Rep. Brit. Ass., Meet. 36 p: 203 | 1868 M. m., A. M. Norman in: Ann. nat. Hist., ser. 4 v.2 p.419 t.23 £.7—11| 1874 M. m., T. Stebbing in: Ann. nat. Hist., ser.4 v.14 p.13 t.2 £.5 | 1876 M. m., A. Boeck, Skand. Arkt. Amphip., v.2 p.559 t.26 f.3 | 1889 M. m., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p. 224 | 1890 M. m., Chevreux in: Bull. Soc. zool. France, v.15 p. 148 f.2,4,6,7 | 1893 M. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 393 t. 56 f.13—16 | 1894 M. m., G. O. Sars, Crust. Norway, v.1 p.567 t.201 | 1898 M. m., Sowinski in: Möm. Soc. Kiew, v.15 p.470 | 1879 Orthopalame ''terschellingi, Hoek in: Tijdschr. Nederl. dierk. Ver., v.4 p.123 t.9 f.4—7. Body, dorsum broadly rounded. Side-plates 1—4 strongly setiferous, 1° and 24 wider in J than in Q. Pleon segment 3, postero-lateral corners broadly rounded. Eyes round, small, dark. Antenna 1 about ’/, as long as body, 1° joint subequal to 24, nearly twice as long as 34; flagellum little longer than peduncle, 8—10-jointed; accessory flagellum with 2 joints, 24 minute. Antenna 2 subequal to antenna 1, ultimate and penultimate joints of peduncle subequal, flagellum longer than ultimate joint of peduncle, 5—7-jointed. Gnathopod 1 rather small, 5tk joint rather long and narrow, setose on hind margin, 6! joint about as long, narrowly oval, more widened distally in S than in ©, palm defined by an obtuse angle. Gmathopod 2 in d, 34 joint longer than 4*h; 5th short, broad, eup-shaped; 6! very large and long, front convex, hind or palmar margin straight between a projecting basal and a distal tooth; between the latter and the finger-hinge is a cavity; finger very long, slightly sinuous, reaching basal tooth of 6th joint. Gnatho- pod 2 in © stouter than gnathopod 1; 4 joint longer than 5tk, the 4th and the cup-shaped 5tk joint being each produced into a strongly setose lobe; 6tk broader than in gnathopod 1 and palm more defined. Uropod 3, peduncle rather stout, ramus subequal to itin length, narrow, tipped with setules LE ER NE RUE ‘ Mieroprotopus, Photis 605 and 2 spines. Telson rather broader than long, distally truncate, with a little tooth at each corner carrying 2 unequal spines. Speer sometimes blackish with erowded dark spots. L. 3 mm. North-Atlantie with adjoining seas (Europe from Bergen in Norway to the Adriatie; Azores). Depth 4—20 m, on sandy bottom. £ 2. M. longimanus Chevreux 1886 &87 M. l., Chevreux in: Bull. Soc. zool. France, v.11 p.XLI; v.12 p.311 £.5; p.295 t.5 f.5—10 | 1890 M.|., ae, in: Bull. Soe. zool. France, v.15 p.148 f.1, 3,5 | 1893 M.l., A. Della Valle : FE. Fl. Neapel, v.20 p.392 1.56 £.7—12 | 1894 Mil; G. ©. Sars, Crust. Norway, v.A p. 568 | 1890 M. macu- jatus (part.), J. Bonnier in: Bull. sci. France Belgique, v. 22 p: 173 t.8,9. Side-plates 1—4 not strongly setiferous, 24 in d rotundo-quadrate. Pleon segment 3, postero-lateral corners rotundo-quadrate. Eyes round, not very small, red. Antennae 1 and 2 equal, nearly as in M. maeulatus, but flagellum of antenna 1 only 5-jointed, 27 N of antenna 2 only #-jointed, scarcely as long as ultimate joint of peduncle. Gnathopod 1 nearly as in M. maculatus. Gnathopod 2 in JS, 34 joint shorter than 4th, 4th with simple setae on the produced rounded apex, 5tk cup-shaped, with long plumose setae on the hind lobe, 6! very large, subreetangular, front margin nearly straight, the opposite one, of which the chief part is palmar, armed according to age with 1—3 strong teeth, finger reaching the tooth nearest the base of the 6th joint. Gmathopod 2 in Q, 4 and 5tk joints broader apically than in JS, 6% much narrower than 5#t, long, tapering, smooth, carrying in front some long plumose setae; finger curved, much shorter than 6tk joint. Peraeopods and uropods differing little from those of M. maculatus. Telson apically rounded. Colour yellowish with transverse brown bands. L. 2 mm. North-Atlantie (Croisie [West-France], Pas-de-Calais). On algae (Rhodomela pinastroides Ag.) on rocks at low-tide, or rocky bottom. M. emissitius (Dana) 1852 Gammarus e., J. D. Dana in: P. Amer. Ac., v.2 p.211 | 1853 & 55 Dercothoe e. (part.), J. D. Dana in: U. S. expl. Exp., v. 1311 p. 969; t.66 f.9a—e | 1862 Dercotho& (Cerapus) e., Dercothoe emistuis, Bate, Cat. Amphip. Brit. Mus., p.259 t.44 f.7 | 1893 Protomedeia maculata (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p. 8387, 436. L. 8 mm. Sooloo Sea. Depth 12 m. M. hirsuticornis (Dana) 1852 Gammarus h., J.D. Dana in: P. Amer. Ac., v.2 p.210 | 1853 & 55 Dercothoe? h., J. D. Dana in: U. S. expl. Exp., v.13u p. 972; t.67 £.2 | 1862 Dercotho& (Cerapus) h., Bate, Cat. Amphip. Brit. Mus., p.260 t.44 f.9 | 1893 Protomedeia maculata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 436. Bay of Rio Janeiro. M. minutus Sowinski 1894 M. m., Sowinski in: M&m. Soc. Kiew, 2.13 p. 329 t.4 £.1—15 | 1898 M. m., Sowinski in: M&m. Soc. Kiew, v.15 p. 470. The description of this species could not be obtained. Sea of Azov. 2. Gen. Photis Kıayer 1842 Photis (Sp. un.: P, reinhardi), Kroyer in: Naturh. Tidsskr., v.4 p.155 | 1876 P., A. Boeck, Skand. Arkt. Amphip., e.2 p.553 | 1888. P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1063 | 1893 P., A. Della Valle in: F. Fl. Neapel, v.20 p.394 | 1894 606 ‘ Photis P., 6. O. Sars, Orust. Norway, v.1 p.568 | 1862 Eiscladus (Sp. un.: E. longicaudatus), Bate & Westwood, Brit. sess. Crust., v.1 p.411 | 1869 Heiscladus, A. M. Norman in: Rep. Brit, Ass., Meet.38 p.255, 259, 284 | 1874 Heiscladius, M’Intosh in: Ann. nat. Hist., ser. 4 v.14 p. 269. Body smooth. Head, lateral lobes somewhat produced. Side-plates 1—5- rather large, 5t" scarcely less deep than the preceding pairs. Eyes on lateral lobes of head. Antennae 1 and 2 subequal, peduncle elongate. Antenna 1 with 34 joint subequal to 1°, a rudiment of accessory flagellum sometimes present. Mouth-parts as in Eurystheus (p. 610), except that 34 joint of mandibular palp is less elongate. Gmnathopods 1 and 2 stronger in J than in ©, 24 stronger than 1°, with short 5*t joint. Peraeopod 3 short, upturned, 24 joint broad, finger.very short, clasped against apex of 6!" joint, and having a dentiele on its outer margin. Uropod 3 (Fig. 103), rami very unequal, the outer having 2 joints, 24 mimute; the inner ramus very small. Telson (Fig. 103) small, broader than long. 5 species accepted, 1 obscure. Synopsis of accepted species: Lateral lobes of head little produced; uropod 3, 1 outer ramus not longer than peduncle — 2. Lateral lobes of head much produced; uropod 3, outer ramus longer than peduncle — 4, 9 Peraeopod 3, 24 joint widened distally . . .. . 1. P. brevicaudata . p. 606 Peraeopod 3, 24 joint narrowed distally — 8. g Gnathopod 1, 6th joint longer than 5th. .... 2. P.reinhardi. . . p. 607 Gnathopod 1, 6th joint not longer than 5th... . 3. P.macrocarpa . p.607 4 { Body slender, side-plates not very deep. . . . . 4. P. longicaudata . p. 608 Body stout, side-plates very deep. . ...... 5. P. tenuicornis. . p. 608 1. P. brevicaudata Stebb. 1888 P.b., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1068 t.108 | 1893 P. reinhardi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.395. Head, lateral lobes acute, little produced. Side-plates 1—5 very deep, 5tk scarcely less deep than 4th and much broader. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes small, round, dark, lenses numerous. Antenna 1, 34 joint intermediate in length between 1° and longer 24, flagellum shorter than pedunele, 7- or 8-jointed. Antenna 2, ultimate and penultimate joints of peduncle equal, flagellum 6-jointed. Gnathopod 1, 5t% joint stout, rather shorter than the oval 6%; palm finely pectinate, continuous with hind margin, only defined by the palmar spines; finger with 4 decurrent teeth. Gnathopod 2, 5th jomt as usual short, cup- shaped; 6tk broad, oblong oval, palm obliquely excavate, defined by a palmar spine at the well marked angle; finger dentate, matching palm. Peraeopods 1 and 2 rather stout and setose; 6% joint not very slender, not 1'/, as long as 5th, Peraeopod 3, 24 joint as broad as long, widened distally; 5 joint rather longer than 4, Peraeopod 4, 24 joint as long, but not quite as broad as in peraeopod 3, remaining joints longer than in peraeopod 3. Peraeopod 5 little longer than peraeopod 4, 24 joint considerably narrower. Uropod 3, outer ramus rather shorter than peduncle, its 24 joint tipped with a long spine. Telson very short, much broader than long, apex rounded. L. less than 4 mm. Off Melbourne. Depth 60 m. \ Photis 607 2. P. reinhardi Kreyer 1842 P.r., Kroyer in: Naturh. Tidsskr., v.4 p.155 | 1876 P.r., A. Boeek, Skand. Arkt. Amphip., v2 p.554 1.26 f.1 | 1893 P.r. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.395 | 1894 P.r., G. O. Sars, Crust. Norway, v.1 p.569 t.202 | 1866 Amphithoe r., Goes in: Ofv. Ak. Förh., v.22 p.532 | 1852 Amphi- tho& pygmaea, W. Liljeborg in: Öfv. Ak. Förh., 0.9 p.9 | ?1895 Photis pollex, A. O. Walker in: P. Liverp. biol. Soc., v.9 p. 312 t.19 f. 16—19. Body rather stout, with broadly vaulted back. Head, lateral lobes acute, not much produced, rounded below. Side-plates 1—5 setose on lower _ margin; 1° a little narrowed distally; 5% very large, distally obliquely rounded. Pleon segment 3, postero-lateral corners rounded. Eyes small, rounded, not elose to margin of head. Antennae 1 and 2 rather strong and setose. Antenna 1 about half as long as body; 34 joint longer than 1%, shorter than 24; flagellum shorter than pedunele, about 9-jointed. Antenna 2 a little shorter, ultimate and penultimate joints of peduncle subequal, flagellum shorter than peduncle, about 9-jointed. Gnathopod 1 in J robust, Stk joint distally widened, a little shorter than the broadly oblong oval 6%; palm nearly transverse, a little excavate, defined by an obtuse angle, finger matching palm, denticulate. Gnathopod 2 in d, 24 joint little produced at lower front corner, 5th broadly eup-shaped; 6th large, palm transverse, defined by a strong tooth, followed by a cavity and than by 2 tubereles near the finger- hinge; finger strong, matching palm. Gmnathopod 1 in © as in C, but rather smaller, palm not exeavate. Gnathopod 2 in oO as in Ö, but smaller, with sinuous palm defined by a projeeting angle with palmar spine. Peraeopods 1—5 comparatively stout. Peraeopods 1 and 2 rather setose. Peraeopod 3, 24 joint as broad as long, narrowest distally. Peraeopods 4 and 5 nearly equal in length; 24 joint oblong oval, narrowing a little distally. Uropod 3, outer ramus scarcely so long as peduncle, its 24 joint tipped with a long spine. Telson rather broader than long, subtriangular, with small process on each side of apex. Colour greyish white, with bands of light brown. L. 5 mm. Aretie Ocean, North-Atlantie, North-Sea and Skagerrak (Greenland; Iceland; Norway, depth 37—94 m; ?Liverpool Bay, depth 4—19 m); Kattegat. 3. P. macrocarpa Stebb. 1888 P. macrocarpus, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1064 t.107 | 1893 P. reinhardi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 395. \ Head, lateral lobes as in P. reinhardi. Side-plates 1—5 not specially setose, 1° distally widened, 5tk with front lobe large but less deep than 4!h, Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes small, round, with very few lenses. Antennae 1 and 2 about ?/, as long as body. Antenna 1, 1% joint rather long, subequal to 34, shorter than 24; flagellum subequal to peduncle, 14-jointed. Antenna 2, ultimate joint of peduncle shorter than penultimate; flagellum subequal to pedunele, 12-jointed. Gnathopod 1, 5th joint rather longer than the oval 6th, — pod3 palm minutely pectinate, only defined by palmar spines, finger rather long -and broad, with 7 decurrent teeth. Gnathopod 2 in C, palm excavate, defined by a tooth i with palmar spine. Gnathopod 2 in ©, 5% joint stout, p, nd but longer than broad, 6tk broad, oblong oval; palm Wropod3sand telson. rather oblique, shorter than hind margin, a little overlapped by the dentate finger. Peraeopods 1 and 2, 4tk joint long, broad, setose in front, 6b about 1'/, as long as 5th; finger over half as long as 6% joint. Peraeopod 3, 24 joint rather longer than broad, much narrowed distally, 608 Photis 5th scarcely so long as 4{h or 6". Peraeopod 4 longer than peraeopod 3. Peraeopod 5 much longer than peraeopod 4; 24 joint rather narrowly oblong. Uropod 3 (Fig. 103), outer ramus about as long as peduncle, 24 joint tipped with a long straight spine. Telson (Fig. 103) about as broad as long, with setules on either side of the triangular apex. L. less than 4 mm. Southern Indian Ocean (Kerguelen Island). 4. P. longieaudata (Bate & Westw.) 1862 Eiscladus longicaudatus, Bate & Westwood, Brit. sess. Crust., v.1 p.412 f. | 1869 Heiscladus l., A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.284 | 1874 Heiscladius l., M’Intosh in: Ann. nat. Hist., ser. 4 v.14 p.269 | 1877 Photis longicaudata, Meinert in: Naturh. Tidsskr., ser.3 v.11 p.142 | 1887 P.1., Chevreux in: Bull. Soc. zool. France, v.12 p.311 | 1894 P.1, G.O.Sars, Crust. Norway, v.1 p.571 t.203 f.1 | 1895 P. longicaudatus, A. O. Walker in: Ann. nat. Hist., ser.6 v.15 p.471 | 1871 P. lütkeni, A. Boeck in: Forh. Selsk. Christian., 1870 p. 233 | 1876 P.1., A. Boeck, Skand. Arkt. Amphip., ©.2 p.556 t.26 f.2 | 1898 P. reinhardi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 395 t.3 £.3, t.10 f. 1—19. Body more slender than in P. reinhardi (p. 607) and side-plates less deep. Head, lateral lobes greatly projecting, narrowly rounded. Side-plate 5 distally narrowly rounded. Pleon segment 3, postero-lateral corners rounded. Eyes very small, round, close to margin of lateral lobes of head. Antennae 1 and 2 slender, not densely setose, subequal, more than half as long as body, flagellum 8- or 9-jointed. Antenna 2, antepenultimate joint of pedunele unusually narrow and elongate. Gnathopod 1, 5tk joint not greatly widened distally, about as long as 6", which widens to the oblique, obtuse-angled palm, Gnathopod 2 in JS, 24 joint produced into a rounded decurrent lobe at distal front corner; 5t" joint cup-shaped; 6 widening to the palm, which is defined by a projecting angle, being also somewhat excavated in the middle, and exhibiting, on either side of the excavation, a slight angular projeetion (Sars), deeply excavated and slightly ciliated (Bate). Peraeo- pods 1—5 much more slender than in P. reinhardi. Peraeopods 1 and 2, 6th joint very narrow, nearly twice as long as 5tt. Peraeopod 5 conside- rably longer than the other peraeopods. Uropod 3, outer ramus longer than peduncle, 24 joint tipped only with 2 slender setae. Telson very small, shaped as in P. reinhardi. Colour whitish with light brown bands, flagella of antennae crimson. L. 9 scarcely over 4 mm (Sars), reaching 12 mm (Bate, Walker). North-Atlantie with adjoining seas (Norway, Denmark, Great Britain, France); Mediterranean (Naples). Depth 10—56 m. 5. P. tenuicornis O. Sars 1882 P.t., G.O.Sars in: Forh. Selsk. Christian., or.18 p.110 1.6 £.4 | 1894 P.t., G.O.Sars, Crust. Norway, v.1 p.572 t.203 f.2 | 1893 P. reinhardi (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 397. Body short, stout, back broadly rounded. Head, lateral corners well produced, narrowly rounded. Side-plates 1—5 large and deep, especially in 9; 1° rather narrowed distally; 5tk large, distally expanded. Pleon segment 3, postero-lateral corners subquadrate, slightly produced. Eyes very small, close to margin of lateral lobes of head. Antennae 1 and 2 equal, very slender, sparsely setose, about '/, as long as body. Antenna 1, 1* joint shorter than 24, a little longer than 34; flagellum nearly as long as "peduncle, 5-jointed. Antenna 2, flagellum as long as ultimate and penultimate joints of peduncle, 5-jointed. Gnathopod 1 in d, 5th joint as long as 6th, distally widened; 6! oval, but with the oblique palm deeply excavate, defined by a Photis, Haplocheira 609 projecting angle, to which the apex of finger reaches. Gnathopod 2 in d, 24 joint with rounded lobe at lower front corner, 5tk joint broadly cup- shaped, 6! very large, palm oblique, much longer than hind margin, defined by a strongly projecting triangular lobe, minutely erenulate and bisinuate, with 2 angular projeetions, finger strong, impinging within the sinus adjacent ‘to defining process. Gmathopod 1 in Q, 5% joint slender, longer than the oval 6, Gnathopod 2 in O stouter, 5tk joint short, cup-shaped, 6 stout, palm oblique, defined by an obtuse angle. Peraeopods 1—5 nearly as in P. longieaudata, but 5th less elongated. Uropod 3, outer ramus longer than peduncle, 24 joint tipped with slender setae. Telson extremely small, nearly twice as broad as long, with projection on each side of apex. Colour whitish grey, with slightly darker hue on side-plates. L. scarcely 4 mm. Aretie Ocean and North-Atlantie (Greenland; Norway, depth 56—75 m). P.producta (Stimps.) 1855 Dercothoe? productus, Stimpson in: P. Ace. Philad., ©.7 p.882 | 1893 Photis reinhardi (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.397. Gnathopods 1 and 2 subequal, 6th joint oblong. L. 16 mm. North-Paecifie (Tanegasima). 3. Gen. Haplocheira Hasw. 1879 Haplocheira (Sp. un.: H. typica), Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.273 | 1885 H., Haswell in: P. Linn. Soc. N. S. Wales, v. 10 p.106 | 1888 H., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1171 | 1881 Haplochira, E. v. Martens in: Z00l. Rec., v.16 Crust. p. 32. Head, lateral lobes not greatly produced. Side-plates of medium depth, öth less deep than 4th, 1st—4th with setae on lower margin. Antennae 1 and 2 short, subequal, peduncle longer than flagellum. Antenna 1 with accessory flagellum. Upper lip faintly emarginate. Mandible, 34 joint of palp shorter than 24. Maxilla 1, inner plate with fringe of many setae, outer with 9 spines; 24 joint of palp long. Maxilla 2, inner plate fringed along inner margin. Maxillipeds, inner plates rather broad, outer narrow and rather short, palp elongate. Gnathopod 1 (Fig. 104 p. 610) simple or scarcely subchelate. Gnathopod 2 (Fig. 105 p. 610) simple, 5t and 6tk joints long and slender, fringed with very long setae. Peraeopods 3—5 robust, not elongate, 24 joint well expanded. Uropods 1—3 rather stout, spinose, peduncle produced to a long spine-like process. Uropod 3 short, peduncle stout, inner ramus minute, much shorter than outer. Telson with hook at each distal angle. 1 species. 1. H. barbimana (G. M. Thoms.) 1879 Gammarus barbimanus, G. M. Thomson in: Tr. N. Zealand Inst., v. 11 p.241 t.10D f.1 | 1886 Corophium barbimanum, G.M. . Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.143 | 1893 Leptocheirus barbimanus, A. Della Valle in: F. Fl. Neapel, v.20 p.433 t.57 f.4,5 | 1879 Haplocheira typica, Haswell in: P. Linn. Soc. N.S. Wales, 0.4 p.273 t.11 f.2 | 1885 H.t., Haswell in: P. Linn, Soc. N.S. Wales, e.10 p.106 t.16 f.4—8 | 1884 Corophium lendenfeldi, Chilton in: Tr. N. Zealand Inst., v.16 p.262 t.20 f.la—e | 1888 Haplocheira plumosa + H. bar- bimanus, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1172 t. 126; p. 1177. Body not much compressed laterally. Head, lateral lobes rounded or pointed. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes oval. Antenna 1, 1° and 24 joints subequal, 34 rather over half as long as 24; flagellum 9—12-jointed; accessory flagellum 2—5-jointed. Antenna 2 Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 39 610 Haplocheira, Eurystheus stouter, ultimate joint of peduncle rather shorter than penultimate, flagellum not longer than ultimate, with 4—6 joints, last tipped with curved spines. Gnathopod 1 (Fig. 104), 4! joint very short, with setae on hind margin; 5th stouter than 6tk, about ?/, as long, densely setose on hind margin; 6 slender, tapering, with long setae on both margins, palm practically wanting; finger with a subapical tooth. Gnathopod 2 (Fig. 105) much like gnatho- pod 1, but 5tk joint as long as the narrow tapering 6%, both fringed on hind margin with double row of very elon- gate plumose setae; finger short, with subapical tooth. Peraeopod 3, 24 joint with a bulge at the proximal hind corner. Peraeopod5, 24joint widened distally. Uropods 1 and 2, rami not very un- equal, those of uropod 2 the stouter; in all the spines are strong. Uropod 3, the outer ramus scarcely as long as peduncle, inner very small. Telson with sides more or less converging to the rather broad, almost transverse apex, with 2 spinules and a setule on the surface near each apical tooth. Colour greyish. L. 5—6 mm. South-Paeifie (Lyttelton Harbour [New Zealand]; Port Jackson [East-Australia], under stones at low-water mark); southern Indian Ocean (Kerguelen Island, depth 222 m). 5% joint —- 4 Fig. 104 &105. H. barbimana. Gnathopods 1 and 2. 4. Gen. Eurystheus Bate 1855 [Subgen.] Gammaropsis (part.), W. Liljeborg in: Vetensk. Ak. Handl., 1853 p. 455 | 1861 @., A. Boeck in: Forh. Skand. Naturf., Mede 8 p.659 | 1876 @., A. Boeck, Skand. Arkt. Amphip., v.2 p.580 | 1888 @., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1092 | 1894 @., G. O. Sars, Crust. Norway, v.1 p.557 | 1856 Eurystheus (nom. nud.), Bate in: Rep. Brit. Ass., Meet.25 p.58 | 1857 E. (Sp. un.: E. tridentatus), Bate in: Ann. nat. Hist., ser.2 v.19 p.143 | 1859 Autonoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.23 | 1873 Eurytheus, A. Marschall, Nomencel. zool., p-409 | 1884 Paranaenia, Chilton in: Tr. N. Zealand Inst., 0.16 p.258 | 1898 Maeroides (Sp. un.: M. thompsoni), A. O. Walker in: P. Liverp. biol. Soc., v.12 p. 282. Body slender. Head, lateral lobes projecting. Side-plates of moderate size, 24—4th yarying in relative depth, 4th not emarginate behind, 5tk with deep front lobe. Eyes, when present, well developed, often rather large. Antennae 1 and 2 slender, nearly equal, with slender setae. Antenna 1, 34 joint elongate, accessory flagellum always distinet, usually of several joints. Upper lip more or less produced in front, distal margin a little insinuate or rounded. Mandibular palp very large, 34 joint lamellar, strongly setose. Maxilla 1, inner plate distinet, its setae varying from 1 to 11, outer plate with 10 spines; 24 joint of palp elongate. Maxilla 2, inner plate with inner margin fringed. Gnathopods 1 and 2 subchelate (Fig. 107 p. 614), 24 stronger in 5 than in Q, and usually with some variation in shape. Peraeopods 1 and 2 (Fig. 106 p. 613), 24 and 4tk joints sometimes a little widened. Peraeopod 4 longer than peraeopod 3, peraeopod 5 longer than peraeopod 4; 24 joint in all somewhat expanded. Uropod 2 shorter than uropod 1, uropod 3 shorter than uropod 2. Telson not elongate. 13 species. RENTE gie EEE ee a a Bee Br, a a EN ei ger, er TE 2 RG IT 5 e . r ; Eurystheus 61l Synopsis of species: 1 ! Eyes lageniform or oblong — 2. Eyes not lageniform or oblong — 3. . 9 es A a ale A Be Er 1. E. atlanticus . . p.611 ne Re Pe ST En 2. Bu afer 2.5 p- 612 3 Pleon segment 4 dorsally dentate — 4. Pleon segment 4 not dorsally dentate — 7. 4 S Telson emarginate . . . . nee 3. E. thompsoni . . p.612 Telson not emarginate — 5. 5 Pleon segment 4 with 1 medio-dorsal tooth — 6. Pleon segment 4 with 3 medio-dorsal teeth 4. E. crassipes . . p.612 6 Gnathopod 2 in Q, palm without defining tooth. 5. E,thomsoni . . p.613 Gnathopod 2 in 2, palm with defining teeth .. 6. E. ostroumowi . p.614 7 - | Gnathopod 2 in S, 2d joint greatly expanded. . 7. E. exsertipes . . p.614 Gnathopod 2in d, 24 joint not greatly expanded — 8. Limbs of peraeon thickly coated with setae and a net 8. E.hirsutus . . . p.615 Limbs of peraeon not thickly coated with setae and fine hairs — 9. : | | Side-plate 3 in & subacutely produced forward. 9. E. dentifer . . . p.615 9 2 Side-plate 3 in $ not subacutely produced for- ward — 10. Gnathopod 2 in d, finger elosing on to the sur- face of 6th joint — 11. Gnathopod 2 in d, finger elosing on to the margin of 6th joint — 12. 1 Gnathopod 2 in d, 6th joint narrow, finger short. 10. E.longimanus . p.616 Gnathopod 2 in d, 6th joint broad, finger long. 11. E.palmatus. . . p.616 19 Telson apically emarginate . . . ... 2... 12. E.chiltoni . . . p.617 Talson not amarginsie 2". eier 13. E. maculatus . . p.617 10 1. E. atlanticus ($tebb.) 1888 Gammaropsis atlantica, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1101 t.114 | 1893 Protomedeia? a., A. Della Valle in: F. Fl. Neapel. v.20 p.441. Q. Head, lateral lobes narrow, acute, strongly produced. Side-plate 1 rather produced forward, but obtusely; 24 broader than deep. Pleon segment 3, postero-lateral corners rounded. Eyes lageniform, close to margin of head, the narrow neck uppermost. “Antenna 1, 34 joint subequal to 1°, shorter than 24; flagellum 17-jointed, accessory flagellum 6-jointed. Antenna 2, ante- penultimate joint of peduncle a little concave above as if to receive lateral lobe of head; ultimate and penultimate joints subequal, flagellum 10-jointed. Gnathopod 1, 5tk joint rather shorter and narrower than 6tk; 6tk oblong oval, palm oblique, slightly defined, longer than hind margin, slightly over- lapped by the finger. Gnathopod 2 much larger; 5t" joint much shorter than 6th, cup-shaped; 6" oblong, palm slightly oblique, irregularly convex, crenate, defined by a tooth, which is overlapped by apex of serrulate finger. Peraeo- pods 3—5, 24 joint well expanded, narrowing distally; finger short. Uropod 3, pedunele a little longer than the rami. Telson a little longer than broad, with triangular apex, a plumose setule at the angles of its base and a spine on the surface near each angle. Colour, dark stellate markings over much of the surface, including the mouth-parts. L. 7 mm. — GS unknown. Tropical Atlantie (St. Vincent [Cape Verde Islands]). 39* 612 Kurystheus 2. E. afer (Stebb.) 1888 Gammaropsis afra, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1097 t.113 | 1893 Protomedeia? a. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 440. 3 E .. Head, lateral lobes narrow, acute, moderately produced. Side- plate 1 not produced forward. .Pleon segment 3, postere-lateral corners slightly rounded. Eyes oblong, vertical, elose to margin of head. Antenna 1, 24 joint much longer than 1° or 39; accessory flagellum 6-jointed. Antenna 8, ultimate joint of pedunele rather longer than penultimate; flagellum 13-jointed. Upper lip smoothly rounded. Gnathopod 1, 24 joint with a distal widening; 5th joint nearly as long and distally nearly as broad as 6th; 6th oblong oval, palm slightly oblique, shorter than hind margin, finger serrulate, matching palm. Gnathopod 2, 5tk joint short, cup-shaped, 6tk rather broadly oval, with palm oblique, very sinuous, defined by a simple angle, finger elosing against a palmar tooth on the surface. Peraeopods1 and 2, 4 joint much longer than 5th, Peraeopod 3, 24 joint-above almost as broad as the length, narrowing distally. Peraeopod 5, 24 joint not much expanded, but broader above than below; finger short. Uropod 3, pedunele rather longer than the short rami, inner a little shorter than the outer. Telson scarcely longer than broad, with some plumose setules on lateral margins and a spine at each angle of base of triangular apex. L. 7 mm. — S unknown. Southern Indian Ocean (Cape Agulhas [South-Afriea]). Depth 270 m. 3. E. thompsoni (A. Walker) 1898 Maeroides t., A.O. Walker in: P. Liverp. biol. Soe., v.12 p.283 t.16 f.3—6 | 1899 Gammaropsis t., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 350. 9 unknown. — d. Pleon segments 4 and 5 each with 2 dorsal teeth on hind margin, a setule at base of each tooth. Head, lateral lobes acute. Side-plates of average depth.. Pleon segment 3, postero-lateral eorners produced to a small tooth, margin above bulging. Eyes large, long oval, dark, entering lateral lobes of head. Antennae 1 and 2 about half as long as body. Antennal, 1° joint little more than half as long as 24, as long as 34; flagellum subequal to peduncle; accessory flagellum 7-jointed. Antenna 2, ultimate joint of peduncle longer than penultimate; flagellum subequal to pedunele. Gnathopod 1, 5% joint as long as 24, longer than the oval, setose 6!" Gmathopod 2 very power- ful; 5tk joint as broad as long, cup-shaped, 6th large, oblong, palm scarcely oblique, defined by an angular prominence, and having 3 submedian double tooth and another larger one near the hinge of the finger, across which it projects a pointed lobe on the outer surface; 5! and 6th joints both setose on hind margin; finger (in figure) strong, a little overlapping the palm. Peraeopods strong, 4" and 5th described as equal; 24 joint broad at base, distally narrowing, hind margin slightly serrate. Uropods 1—3 extending back the same distance. Uropod 3, peduncle nearly as long as the equal spinose rami. Telson widely but not deeply cleft, a spine and a seta at the end of each division, figured only in lateral view. Colour yellowish with grey dorsal freckles and darker spots on 24 joint of peraeopods. L. 10 mm. Puget Sound. 4. E. crassipes (Hasw.) 1880 Moera e., Haswell in: P. Lmn. Soe. N. S. Wales, v.5 p.103 t.7 f.2 | 1899 Gammaropsis c., T. Stebbing in: Ann. nat. Hist., ser. 7 ©.3 p. 850 | 1893 Ceradocus fasciatus (part.)?, A. Della Valle in: F. Fl. Neapel, 0.20 p.723. Pleon segment 4 with 3 small distant teeth on hind dorsal margin. Head, lateral corners not acute. Side-plates all small, 6% Jike 5%, scarcely smaller. Pleon segment 3, postero-lateral eorners quadrate, not acute. Eyes Eurystheus 613 blackish or brownish in spirit, not large. Antennae 1 and 2 subequal, fringed with long slender setae. Antenna 1, 3% joint longer than 1°, nearly equal to 24, flagellum shorter than pedunele, about 20-jointed; accessory flagellum 7—10-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal; flagellum shorter than pedunele, 18—24-jointed. Upper lip acutely produced in front. Mandible, spines of spine-row numerous. Maxilla 1, inner plate fringed with setae. Gmathopod 1 in JS, 5tk joint longer but rather narrower than 6%; 6th widest where palm joins hind margin with strong, scarcely interrupted convexity; finger slightly overlapping palm. Gnatho- pod 1 in oO, 6! joint not wider than 5%, Gmnathopod 2 in J, 4 joint small, quadrate, 5tk small, cup-shaped, very short, 6! very large, widening to the nearly transverse palm, defined by a strong tooth, near to which is another conspieuous tooth of variable size, followed by a 24 cavity and a squarish prominence; finger massive, closing down between the 2 teeth, and having on its inner margin a prominence not nearly large enough to fill ‚the 24 cavity of palm, and a bulge near the hinge. Sometimes one of the gnathopods 2 is much smaller than the other, and has tbe 5tk joint relatively larger, the 6* with less prominently sculptured palm as in the ©. Peraeo- pods 1—3 short. Peraeopods 3—5, finger short, stout, much ceurved. Peraeo- pod 3, 24 joint oval, narrowed a little distally. Peraeopod 4 much longer than the preceding peraeopods, stout; 4—6t joints widening with age, 24 relatively narrow, little longer than 4" or 6, oblong, but with hind margin convex above and below the concave middle part. Peraeopod 5 subequal to 4th in length, less broad, 24 joint oblong, sinuous hind margin serrate, produced subacutely downward. Branchial vesicles narrow at base, broadly rounded distally. Uropod 3 short, the subequal rami nearly as long as pedunele. Telson small, as broad as long, apical border with an acute central projection, a spine on each of the pair of subapical, sublateral elevations. L. 8 mm. Port Jackson and Jervis Bay [East-Australia]. 5. E. thomsoni (Stebb.) 1888 Gammaropsis t., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1103 t.115 | 1893 Protomedeia? afıra (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 440. (\ = 9. Pleon segments 4 and 5 with medio-dorsal emargination, 4% with a small tooth in centre of emargination. Head, lateral lobes narrow, subangular. Side-plate 1 a little produced forward, obtusely, 24 much larger, about as broad as deep. Pleon segment 3, postero-lateral corners forming a slightly upturned tooth, hind margin bulging above. Eyes rather large, close to margin of head. Antennae 1 and 2 broken. Upper lip slightly and unsymmetrically bilobed. Gnathopod 1, 5th joint longer than 6tk, spinose behind; 6 spinose on both sides, oval, more convex behind than in front; palm finely pectinate, slightly defined; finger long, serrate, celosely fitting the palm. Gnathopod 2, 24 joint not expanded, 5th triangular, cup-shaped; 6% Jarge, widening to the palm, which is long, oblique, denticulate, 2 of the teeth prominent, the defining angle obtuse, carrying palmar spines, finger almost smooth, mätching the palm. Peraeopods 1 and 2 (Fig. 106) glandular, of the usual pattern. Peraeopods 3—5, 24 joint Fig. 106. E. thomsoni, 2. Peraeopod 2. Ba a N a N 7 a 614 Eurystheus a sort of oblong oval, narrowed distally, hind margin rather sinuous in peraeo- pods 4 and 5; finger short. Uropod 3, peduncle as long as the equal rami. Telson little longer than broad, almost round, with a spine at each apical angle. L. 6 mm. South-Pacifice (east of New Zealand). Depth 2000 m? 6. E. ostroumowi (Sowinski) 1898 Protomedeia o., Sowiuski in: M&m. Soc. Kiew, v.15 p.475 t.10 £. 1—19. Pleon segments 4 and 5 each with 1 dorsal tooth, preceded by a spinule or setule (hind margin of segment 5 in figure emarginate between 2 teeth?). Head, lateral lobes outdrawn to a small acute point. Side- plate 1 with 2 little teeth on lower margin, 24—4th with denticle at lower hind corner. Pleon segment 3, postero-lateral corner acute, slightly upturned, with small sinus above. Eyes large, reniform, almost filling the lateral lobes of head. Antenna 1, 1% and 34 joints equal in length, shorter than 24; flagellum subequal to 24 and 34 joints combined, 9-jointed; accessory flagellum 4-jointed. Antenna 2 about as long as antennal, ultimate joint of peduncle a little shorter than penultimate; flagellum a little longer than penultimate joint, 9-jointed. Mandible, 24 and 34 joints of palp equal. Maxilla 1, inner plate fringed with numerous setae. Maxilla 2 and maxillipeds normal. Gnathopod 1 as in E.thom- soni (p. 613). Gmnathopod 2 in © nearly as in E. thomsoni, but 6% joint scarcely widening to palm, which is defined by a small tooth. Gmathopod 2 in d, 6th joint very large, widening to palm, scarcely longer than broad, palm defined by a strong tooth, and having a median sinus between two denticulate slopes, finger strong, matching palm, which is subjeet to some variations. Peraeopods 1 and 2, none of the joints speeially robust. _Perae- opod 3, 24 joint oblong oval. Peraeopod 4, 24 joint much larger than in peraeopod 3 but of the same shape, 4! (in G only) monstrously expanded behind so as to resemble a 24 joint rather than a 4", nearly as broad as long, narrowed distally, almost as large as the 24 joint, but differently shaped. Uropod 3, peduncle as long as outer ramus, which is rather shorter than inner. Telson as in E. thomsoni. L. a little under 11 mm. Bosphorus. Down to 85 m. 7. E. exsertipes (Stebb.) 1888 Gammaropsis e., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1093 t.112 | 1893 Protomedeia e., A. Della Valle in: F. Fl. Neapel, v.20 p.440 1.57 £.12. Head, lateral lobes narrow, acute. Side-plate 1 rounded in front, produced a little forward; 24 in 9 broader than deep, 5tk nearly as deep as 4th- Pleon segment3, postero-lateral corners rounded. Eyes small, subrotund. Antenna 1 as long as the body, 1° joint as long as the head, 24 much longer, 34 intermediate; flagellum rather shorter than peduncle, 17-jointed; accessory flagellum with 4 slender joints. Antenna 2 rather shorter, ultimate joint of peduncle a little shorter than the elongate penultimate, flagellum about half as long as peduncle, 12-jointed. Upper lip faintly Fig. 107. ee emarginate. Gmnathopod 1, 5! joint a little shorter than 24, a little longer than 6tk, 6th narrowly oval, front with spines in rows, hind margin and palm a continuous convexity, palm finely pectinate, finger serrate, in d even longer than the 6% joint. re SE a ee Pe BE sel er ae a SE a ERIEnT Eurystheus 615 ‘Gnathopod 2 in G (Fig. 107) little longer but much broader than gnathopod 1; 24 joint attached close to lower margin of side-plate, widely expanded, some- what narrowed distally; 5t% short, cup-shaped; 6th Jarge, longer than broad, widening to the oblique palm, which is defined by a pretty strong tooth, whence it has a straight slope till near the finger-hinge; finger serrate, strongly curved, .closing on to the surface without reaching defining tooth of palm. Gnatho- pod 2 in 9, 24 joint broad, but not abnormally so, palm defined by a small acute tooth, the oblique margin finely pectinate, not irregular. Peraeopods 1 and 2 not very stout. Peraeopods 3—5, 24 joint not greatly expanded, narrowed ‚distally ; peraeopod 5 the longest. Uropod 1, pedunele longer than rami. Uropod 2, rami very unequal, peduncle longer than the outer, scarcely so long as the inner. Uropod 3, pedunele longer than the narrow subequal rami. Telson shorter than peduncle of uropod 3, longer than broad, subtriangular, with a spine near centre of each side, the margin below on each side furry with scale- like spinules. L. 10 mm. Southern Indian Ocean (Kerguelen Island). 8. E. hirsutus Giles 1887 E.h., G.M.Giles in: J. Asiat. Soc. Bengal, v. 56 p-227 t.8 | 1888 Gammaropsis h., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1643 | 1893 Protomedeia maculata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 439. Pleon segment 3 dorsally longer than any other segment. Head, lateral ’lobes blunt. Side-plates all (in figure) exceedingly shallow, 5t—7th almost transversely linear (not mentioned in text). Eyes rather small, red brown. Antenna 1 rather more than !/, as long as body; 34 joint (in figure) scarcely ‚so long: as 1°, 24 longer than 1°; flagellum shorter than pedunele, 11-jointed; accessory flagellum with 4 short joints. Antenna 2 a little shorter, ultimate ‚joint of peduncle slightly shorter than penultimate, slightly longer than the 7-jointed flagellum. Gmnathopod 1, 6! joint oval, nearly as long as 5th; finger weakly serrate. Gnathopod 2, 24 joint not expanded, 5tk cup-shaped, 6th rather broadly oval, palm oblique, defined by a little tooth and having a small median one; finger feebly serrate, curved. Peraeopods 1 and 2, 24 joint a little expanded, narrowly oval; peraeopod 1 rather the longer and stouter. Peraeopods 3—5, 24 joint greatly expanded; peraeopod 5 the longest, 4! much longer than 34. Uropod 3 very short, rami not much longer ‘than peduncle. Telson a short compressed lamina armed with a number of ‚short tooth-like spines like those on the uropods. Colour, nearly transparent with a few patches of reddish brown. L. 4 mm. Bay of Bengal. Surface. 9. E. dentifer (Hasw.) 1879 Moera dentifera, Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.332 t.20 f.4 | 1884 Paranaenia typica + P.d., Chilton in: Tr. N. Zealand Inst., ©. 16 p.259 t.19 f.1 (S juv.?); p.260 t.21 f.2 | 1893 P.d. (part.), Protomedeia -(part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 441 | 1899 Gammaropsis d., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.350. Head, lateral corners acute. Side-plate 3 in J produced forward rather :acutely under the 24, the long lower margin having a series of elliptical markings or pellueid spaces. Pleon segment 3, postero-lateral corners quadrate with minutely produced point. Antenna 1, 3% joint equal to 1, shorter than 24; ‘flagellum shorter than peduncle, reaching 13 joints; accessory flagellum with 5 or 6 long joints. Antenna 2, ultimate and penultimate joints of peduncle ‚subequal; flagellum 13-jointed. Gnathopod 1 small, 5tk joint rather longer 616 Eurystheus than 6th; 6th widest at base, which is straight, palm slightly distinguished from serrate hind margin; finger overlapping palm. Gnathopod 2 ind, 29 joint channelled in front, each front margin ending in a rounded lobe; 4th gubacutely produced behind the short cup-shaped 5th; 6th very large, widening to the palm, which is very oblique, nearly straight, bordered by several faseieles of long setae, and defined by a long tooth; finger long, strongly curved, dilated at base. Gnathopod 2 in Q with 5tk joint longer than in d, palm of 6% ill-defined (Chilton, in figure). Peraeopods 1—5 of the usual relative lengths, none robust; 24 joint in peraeopods 3—5 but little dilated. Uropod 3, rami longer than peduncle, inner slightly the longer. Telson very small, truncate, each of the subapical projeetions carrying a spine.. Colour light olive with minute black dots. L.5 mm. South-Pacifie (Port Jackson [East-Australia]; Lyttelton Harbour [New Zealand]).. 10. E. longimanus (Chilton) 1884 Paranaenia l., Chilton in: Tr. N. Zealand. Inst., v:16 p.261 t.20 f.2a—c | 1899 G@ammaropsis I., 'T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p. 350 | 1898 Paranaenia dentifera (part.), Protomedeia (part.)?. A. Della Valle in: F. Fl. Neapel, v.20 p.441. Side-plates normal, 3% not produced forward as in | of E. dentifer (p: 615). Gmathopod 1 in JS, 4 joint ending distally in an acute point; 5th considerably longer than 6%, thiekly fringed with setae, chiefly in short. transverse rows, 6'" not broader than 5t", tufts of setae on both sides, palm slightly coneave, defined by a short stout spine; finger much longer than palm, slightly curved, acute. Gnathopod 2 in d, 4 joint distally acutely produced, 5% triangular, more than half as long as 6*"; 6 not wider than 5th, rectangular, twice as long as broad, with 3 rows of setae in tufts, palm transverse, rounded off; finger short, eurved, impinging on lateral surface of 6'h joint. Gnathopod 1 in ©, palm slightly convex, not defined. Gnatho-- pod 2 in © smaller than that of J, palm slightly concave. Uropod 3, rami: only slightly longer than peduncle. L. 5 mm. Lyttelton Harbour |New Zealand]. 11. E. palmatus (Stebb. & D. Roberts.) 1891 Podoceropsis p., T. Stebbing’ & D. Robertson in: Tr. zool. Soc. London, v.131 p.36 t.6 | 1899 Gammaropsis palmata,. T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.850 | 1898 Podoceropsis megacheir (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.453 t.57 f.23, 24 | 1898 P, m., Sowinski in: Möm. Soc. Kiew, v.15 p.466 t.9 f.1—8 | 1894 Gammaropsis nana, P. palmata?, G.O. Sars, Crust. Norway, v.1 p.561 1.199 f.2; p.562 | 1895 @.n., A.O. Walker in: P.. Liverp. biol. Soe., v.9 p.8311. Body moderately slender. Head, lateral lobes acutely produced. Side- plates 1—5 rather deep; 5t" with front lobe nearly as deep as 4". Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes dark brown, rounded (Sars), oval (Walker). Antenna 1 less than half as long as body, 34 joint a little longer than 1°, 24 longer than 34; flagellum shorter than peduncle,. with 5 or 6 joints; accessory flagellum with 2 or 3 joints, the last minute. Antenna 2 a little shorter, ultimate and penultimate joints of peduncle subequal;. flagellum about half as long as peduncle, 5-jointed (Sars, in figure). Upper: | lip but slightly produced in front. Gnathopod 1, 5" and 6tk joints subequal, 5th fully as long as 6tk or somewhat shorter, 6 with palm more or less deeply excavate, triangular oval, finger with minute setules and a dentiele or perfectly smooth. Gnathopod 2 in C, 24 joint not expanded, 5t" ceup-shaped, 6tk broadly - Er FE er Ei Ei. “ en. 6 ze ee ee a Eurystheus 617 oblong, palm nearly transverse, but strongly rounded at the angle or bisinuate; finger strongly eurved, much longer than the palm, elosing against inner surface of 6 joint. Gnathopod 2 in O little stronger than gnathopod 1, 6" joint longer than 5#", oblong oval, not broad, palm defined by a distinet angle, its margin minutely but irregularly crenulate, finger a little overlapping the defining angle. Peraeopods 1 and 2, 24 joint a little widened, narrowly oval. Peraeopod 3, 24 joint wide proximally, narrowing distally. Peraeopod 4 longer, 24 joint longer but narrower. Peraeopod 5 similar to peraeopod 4, but of larger dimensions. Uropod 3, pedunele longer than the equal, acute rami. Telson small, as broad as long, apical margin slightly concave with a couple of spinules on surface ridge at each side. Colour whitish with light brown transverse bands (Sars). L. Q scarcely exceeding 3, d 4 mm. Firth of Clyde; Christianiafjord, depth 38 m; Bosphorus, depth 36 m. 19. 2 chiltomi (@: M. Thoms) 1897: ‚Maere c., ©... Thomson in: Ann. net Hist., ser. 6 0.20 p.447 t.10 f.1—5 | 1899 Gammaropsis e., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p. 350. Body slender, rather compressed. Head, lateral lobes produced into an obtusely pointed process. Side-plate 1 elongated, widening and rounded below, produced forward at their infero-anterior angle. Eyes subreniform, broader below than above, elose to margin of lateral lobes of head. Antenna 1, 18 joint stout, 24 about twice as long as 1°, 34 about ?/, as long as 24; flagellum unknown; accessory flagellum nearly as long as ultimate joint of peduncle. Antenna 2, pedunele subequal to pedunele of antenna 1, ultimate and pen- ultimate joints of pedunele subequal; flagellum slightly longer than ultimate joint. Mandibular palp, 24 and 34 joints widening distally, 24 longer than 34, 34 with long setae on broad apex. Maxilla 1, inner plate short, acute, without setae, outer with 10 spines, palp apparently 3-jointed, the middle joint short (P). Maxilla 2, inner plate fringed with short setae, chiefly round the inner margin. Maxillipeds normal, 4% joint of palp short- and rounded, with stout apical setae, but without a elaw. Gmnathopod 1 small, 4! joint produced into an acute tip (in figure rotundo-quadrate at apex); 5th long, widening a little distally, 6% shorter, narrow ovate, palm oblique, dentate (no teeth in figure); finger curved, acute, about °/, as long as 6 joint (in figure subequal), with a few minute denticulations along inner edge. Gnathopod 2 very large, 4! joint produced forward and channelled; 5th large, triangular, cup-shaped, as broad as long; 6th very large, hind margin straight, front very convex, producing a great bulge a little way from the base, ending in a small tooth at the finger-hinge; palm nearly transverse, with large triangular median tooth, followed by a cavity and ending with a slightly concave margin, finger strong, folding down a little beyond the palm. Peraeopods 1 and 2 slender, 34 stout, 4% and 5tk successively longer, rather slender. Uropod 1 the longest, pedunele with large apical spine, rami subequal, shorter than peduncle. Uropod 2, inner ramus subequal to peduncle, rather longer than outer. Uropod 3 shortest, rami subequal, rather shorter than peduncle. Telson subquadrate, sides converging, a rounded emargination extending "'/, of the length, between 2 obtuse apices, each with a spinule. L. 4—5 mm. South-Paeific (New Zealand). Depth 15 m. 13. E. maculatus (Johnst) 1827 Gammarus m., &. Johnston in: Zool. J., v.8 p.176 | 1888 Gammaropsis m., T. Stebbing in: Rep. Voy. Challenger, v.29 p-131, 286 | 1893 Protomedeia maculata (part.), A. Della Valle in: F. Fl. Neapel, v.20 We. N ae a a, © ‘ r 618 Eurystheus, Podoceropsis p. 486 t. 14 f. 28—40; t.57 £.8—11 | 1855 Gammarus (Gammaropsis) erythrophthalmus, W. Liljeborg in: Vetensk. Ak. Handl., 1853 p.455 | 1871 Gammaropsis e. (part.?), A. Boeck in: Forh. Selsk. Christian., 1870 p.241 | 1876 @. e. (part.?), A. Boeck, Skand. Arkt. Amphip., v.2 p.581 t.25 £.6 | 1889 @.e., Hoek in: Tijdschr. Nederl, dierk. Ver., ser.2 v.2 p.226 t.9 f.4k | 1894 @. erythrophthalma, G. O. Sars, Crust. Norway, v.1 p.558 t.198 | 1895 @.e., A. O. Walker in: Ann. nat. Hist., ser.6 v.15 p.470 | 1859 Autonoe e., R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p.27 | ?1866 Maera e., Cam. Heller in: Denk. Ak. Wien, v.2611 p. 42 | 1856 Eurystheus tridentatus (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.58 | 1857 E.t., Bate in: Ann. nat. Hist., ser. 2 v.19 p.143 | 1862 E. erythrophthalma + E. bispinimanus + Gammarus maculatus, Bate, Cat. Amphip. Brit. Mus., p. 196 t.35 f£.7; p.197 t.35 f.8; p.223 | 1882 Gamma- ropsis melanops, &. OÖ. Sars in: Forh. Selsk. Christian., nr. 18 p. 111 1.6 £.5 | 1894 G@. m., G.O. Sars, Crust. Norway, v.1 p.560 t.199 £.1. Body rather slender, 4 pleon segment (Boeck) armed with 2 minute medio-dorsal teeth. Head, lateral lobes acute. Side-plate 2 largest in 9. Pleon segment 3, postero-lateral corners quadrate with small tooth, margin above more or less bulging. Eyes rather large, oval reniform, red or very dark. Antenna 1, 1% joint subequal to 34, or shorter; flagellum 10—15-jointed;; accessory flagellum 4—6-jointed.. Antenna 2 rather shorter. Upper lip produced acutely or obtusely in front. Gnathopod 1 slender; 5tk and 6th joints subequal; palm ill-defined; finger denticulate (Bruzelius). Gnathopod 2 much larger; 2% and 5tk joints robust in J, 6 with palm oblique, having 3 (2?) teeth or tubercles in the d, 2 in the 9. Peraeopods 3—5, 24 joint well expanded or narrowly oval. Uropod 3, rami about as long as peduncle. Telson as broad as long, with a spine and usually setules on each side of apex. Colour pale yellow with dusky bands. L. 6—12 mm. Arctie’ Ocean and North-Atlantie (Greenland, depth 38—112 m; from Norway to France; Azores). 5. Gen. Podoceropsis Boeck 1861 Podoceropsis (Sp. un.: P.sophia), A. Boeck in: Forh. Skand.Naturf., Mode 8 p.666 | 1876 P., A. Boeck, Skand. Arkt. Amphip., v.2 p.583 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1108 | 1893 P. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 451 | 1894 P., G. O. Sars, Crust. Norway, v.1 p.574 | 1862 Noenia, Bate (& Westwood), Brit. sess. Orust., v.1 p.471 | 1862 Naenia (non J.F. Stephens 1829, Lepidoptera!), Bate, Cat. Amphip. Brit. Mus., p.271 | 1871 Xenoclea (Sp. un.: X. batei), A. Boeck in: Forh. Selsk. Christian, 1870 p. 234. i Like Eurystheus (p. 610), except that antenna 1 has no accessory flagellum or only a rudiment of it, and that gnathopod 2 in the GC has the 5tb joint always short and in the Q has the 6! joint conspieuously wider than that of gnathopod 1. 5 species. Synopsis of species: 1 Eyes wanting — 2. Eyes present — 8. 9 | Gnathopod 2, palm obliue . . 2.2... 1, P,ebyenl ci p. 619 Gnathopod 2, palm transverse . ...... 2. P.kermadeci . . . . p.619 3 Peraeopods 1 and 2, 6th joint very long . . 3. P.lindahlüi. ... . p- 619 Peraeopods 1 and 2, 6th joint not very long — 4. 4 | Side-plate 5 not as deep as side-plate 4. . . 4. P.sophia. .... . p- 620 Side-plate 5 fully as deep as side-plate 4. . 5. P.nitida.. . .. . p- 620 u Pe ih, un 1 u a A re N ee ee EEE Podoceropsis e 619 1. P.abyssi Chevreux 1887 P.a., Chevreux in: Bull. Soc. zool. France, v,12 p. 577 | 1893 P.a., A. Della Valle in: F. Fl. Neapel, v.20 p.452 | 1896 Gammaropsis abyssorum, J. Bonnier in: Ann. Univ. Lyon, v. 26 p. 661 t.40 f.2. Body narrow, elongate. Head with inter-antennal process produced into a point. Side-plates small, 1—4th reetangular, 2 the largest. Pleon segment 3, postero-lateral corners rounded. Eyes wanting. Antenna 1 ?/, as long as body; 1°t joint as long as head, 24 twice as long as 1°, 34 as long as 24; flagellum with 7 very long joints; accessory flagellum consisting of 1 extre- mely short joint. Antenna 2 nearly as long as antenna 1; ultimate and penulti- mate joints of peduncle equal; flagellum 5-jointed. Maxillipeds, 4th joint of palp long, unguiform. Gnathopod 1 rather large, 5" joint triangular, */, as long as 6th, 6th hroadly oval; palm carrying 3 large, obtuse, finely erenulate teeth and ending in a smooth acute tooth; finger nearly as long as 6th joint. Gmnathopod 1 in Q weaker than in J, gnathopod 8, 5th joint short, 6th similar to that of gnathopod 1 but larger, palm carıying a sharp tooth, followed by several non-erenulate tubercles, finger relatively much shorter. Gnathopod 2 in Cd stronger on the right side than on the left. Peraeo- pods 3—5, 24 joint long and narrow. Uropods 1—3 with peduncle rather short; rami of uropods 1 and 2 with a few spines; rami of uropod 3 bare, equal, shorter than peduncle (Bonnier, in figure). Telson small, triangular, carrying a large stiff hair towards the middle of its upper part. L. 3—4 mm. Bay of Biseay. Depth 510-950 m. 2. P.kermadeci Stebb. 1888 P. k., T. Stebbing in: Rep. Voy. Challenger, ».29 p.1109 t.116 | 1893 P.sophiae (part:), A. Della Valle in: F. Fl. Neapel, v.20 p.452. Head, lateral lobes acute, not very prominent. Side-plates 1—4 not very deep, 24 the largest, broader than deep. No eyes perceived. Antenna 1, 1° joint longer than the head, a little shorter than 24, subequal to 34; flagellum with 6 joints, the 1° longest; a rudimentary accessory flagellum, tipped with 2 setules. Antenna 2 rather shorter, like antenna 1 carrying long setae; ultimate joint of peduncle slightly shorter than penultimate; flagellum with 5 joints, 1° longer than the rest combined. Upper lip faintly emarginate, obtusely produced in front. Maxilla 1, inner plate with 3 plumose setae on inner margin, 2 apical setules. Maxillipeds, outer plates rather short, not strongly armed; 24 joint of palp long, finger short, blunt, tipped with spines. Gnathopod 1 rather feeble, 5!" joint fully as long and broad as 6th; 6th oblong oval, palm finely pectinate, almost transverse; defining angle obtuse, much overlapped by the curved finger. Gmnathopod 2, 24 joint with eoncave front and convex hind margin, 5th short, cup-shaped, much narrower than the 6%, which is of great size, nearly as broad as long, widest at the transverse palm, this being much sculptured, with blunt defining tooth, to which an acute one is adjacent, separated by a well marked cavity from the serrate and dentate portion which meets the hinge of the finger; finger curved, almost smooth, and matching the palm. Peraeopods 1 and 2 rather long and slender, 6! joint longer than 4%, nearly as long as 24; finger half as long as 6*% joint. Rest wanting. Existing portion 5 mm long. South-Pacifie (north of Kermadee Islands). Depth 1152 m. 3. P. lindahlii H. J. Hansen 1887 P.1., H. J. Hansen in: Vid. Meddel., ser. 4 0.9 p.157 t.6 f.2, 2a | 1893 P.l., A. Della Valle in: F. Fl. Neapel, v.20 p.453 | 1894 P. lindahli, G. O. Sars, Crust. Norway, v.1 p. 574. % 620 £ Podoceropsis Head, lateral lobes somewhat produced, rounded. Side-plate 1 (in figure) very small, 24—4th subequal, 5tk deeper. Pleon segment 3, postero- lateral corners broadly rounded. Eyes large, ovate, black. Antennae 1 and 2 subequal, less than half as long as body. Antenna 1 with long setae, 1° joint ?/, as long as 24, 34 intermediate in length; flagellum about 8-jointed, with no accessory flagellum. Antenna 2, flagellum about 8-jointed. Gnatho- pod 1 rather feeble, 6" joint a little shorter and not broader than 5tk, finger much longer than the somewhat oblique palm. Gnathopod 2 rather robust, 5t" joint short, cup-shaped, 6!" ?/, as broad as long; palm somewhat oblique, evenly rounded. Peraeopods 1 and 2 elongate, almost longer than peraeopod 5; 6th joint unarmed, very elongate, nearly as long as 4! and 5th combined. Peraeopods 4 and 5, 24 joint rather narrow, narrowing distally, 4th and 6th joints subequal. Uropod 3, peduncle rather longer than the sub- equal rami. Telsön furnished with 2 setae. Sex and age doubtful. L. 5 mm. Davis Strait (West-Greenland). Depth 91 m. 4. P.sophia Boeek 1861 P.s., A. Boeck in: Forh. Skand. Naturf., Mode 8 p. 666 | 1888 P. s., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.322 | 1871 P. sophiae, A. Boeck in: Forh. Selsk. Christian., 1870 p.242 | 1876 P.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.584 t.25 £.7 | 1893 P. s. (part.), A, Della Valle in: F. FI. Neapel, v. 20 p- 452 t.57 f.21, 22 | 1894 P.s., G. O.Sars, Crust. Norway, v.1 p. 574 t.204 | 1895 P. s., A. O. Walker in: Ann. nat. Hist., ser. 6 v.15 p.473 | 1862 Noenia tubereulosa + N. undata, Bate (& Westwood), Brit. sess. Crust., ®. 1. p. 472, 477 f.. | 1862 Naenia t. + N. u., Bate, Cat. Amphip, Brit. Mus., p. 271 t.46 f.2; p. 272 t.46 f.5. Head, lateral lobes sharply quadrate. Side-plate 1 small, rounded in front, 5tk not so deep as 4h. Pleon segment 3, postero-lateral corners with minutely produced obtuse point. Eyes large, broadly oval, bright red. Antennae 1 and 2 equal, nearly °/, as long as body. Antenna 1, 1% joint shorter than 34, 24 much longer; flagellum shorter than peduncle, about 10-jointed. Antenna 2, ultimate and penultimate joints of peduncle elongate, equal; flagellum 7- or 8-jointed. Upper lip slightly emarginate, very obtusely produced in front. Mandibular palp rather slender. Gmathopod 1 slender, 5ih joint as long as 6%; 6th oval, hind margin with ill-defined palm much more convex than front; finger rather long, denticulate. Gnathopod 2 in J, 5th joint short, cup-shaped, 6!" large, oblong oval, twice as long as broad; palm oblique, longer than-hind margin, not strongly defined, with 2 tooth- like projections not far from finger-hinge; finger strong, curved. Gnatho- pod 2 in 9, 6fh joint very large, oval; palm longer than hind margin, minutely serrulate, nearly straight, armed with 3 (Bate: 2) successive spines (Sars); finger long, serrate. Peraeopods 1 and 2, 4 joint nearly as long as 5th and 6tk combined. Peraeopods 3—5, 24 joint oblong oval. Uropod 3, rami a little longer than peduncle, with acute, unarmed apex (Sars), tipped with spines (Bate, in figure). Telson ovoid, a little longer than broad, with 2 spinules on each side of apex. Colour, reddish and yellow bands and patches along the sides; ova in pouch bright red. L. 6 mm. North-Atlantie, North-Sea, Skagerrak and Kattegat (Norway, Denmark, Holland, Great Britain, France). Depth 56—282 m. 5. P. nitida (Stimps.) 1858 Podocerus nitidus, Stimpson in: Smithson. Contr., v.6.nr.5p.45 | 1862 Noenia rimapalmata (N.rimapalma Bate) + N. excavata (Bate), Bate & Westwood, Brit. sess. Crust., v.1 p. 474 f.; p.476f. | 1862 Naenia rimapalma + N. e., Bate, Cat. Amphip. Brit. Mus., p.272 t.46 f.3,4 | 1877 Podoceropsis rimapalmata + N. e., Meinert in: Naturh. Tidsskr., ser.8 «.11 p.152 | 1879 N.r., T. Stebbing in: Rep. Mr ei TEN, Alm A Fe ae Er BR ra a, a A er DR Re MERTEE En pn PER IS Podoceropsis, Megamphopus | 621 Devonsh. Ass., «. 11 p.520 | 1894 Podoceropsis excavata, G. O. Sars, Crust. Norway, ®.1 p. 576 t.205 | ?1867 Noenia caudadentata (nom. nud.), A. M. Norman in: Nat. Hist. Tr. Northumb., v.1 p.16 | 1871 Xenoclea batei, A. Boeck in: Forh. Selsk. Christian., 1870 p-235 | 1876 X.b., A. Boeck, Skand. Arkt. Amphip., v.2 p.561 t.25 f.8 | 1890 Podo- ceropsis b., Meinert in: Udb. Hauchs, v.3 p.178 | 1876 Xenoclea megachir, S. 1. Smith & Harger in: Tr. Connect. Ac., v.3 p.82 t.3 £.1—4 | 1893 Podoceropsis sophiae (part.), A.DellaValle in: F. Fi. Neapel, v.20 p. 452, Body rather -stouter than in P. sophia; head with lateral lobes more acutely produced with less convex lower margin. Side-plate 1 not very small, 24 in broader than deep, 5th fully as deep as 4. Pleon segment 3, postero-lateral corners with obtuse point scarcely produced. Eyes of moderate size, rounded oval, dark. Antennae 1 and 2 equal, more than ’, as long as body; peduncles as in P. sophia; flagellum of antenna 1 12—16-jointed, of antenna 2 13-jointed. Upper lip feebly emarginate, produced in front to a sharp point. Mandibular palp not very slender. Gnathopod 1 very slender, 6th joint scarcely as long as 5tt, subfusiform, finger very long. Gmathopod 2 in JS, 5th joint short, eup-shaped, 6th very large, oblong oval; palm minutely tuberculate, with a median sinus between 2 lobes, that near the finger-hinge truncate and a little emarginate, the other dentiform not far from the defining angle, which is scarcely reached by the broad curved finger. Gmathopod 2 in 2 as in J, except that the cavity in the palm is wider, not bounded by a separate lobe near finger- hinge, and the tooth on the other side is closer to the defining angle. Peraeo- pods 1—2, 4 joint not nearly as long as 5!" and 6" combined. Peraeopod 3, 24 joint nearly as broad as long. Peraeopods 4 and 5, 24 joint oblong oval. Uropod 3, rami rather unequal, a little shorter than peduncle, the inner the larger, tipped with 2 setules. Telson as broad as long, with 3 slender spines on either side of apex. Colour, variegated with dark brown, especially along the sides. L. 7—8 mm. North-Atlantie, North-Sea, Skagerrak and Kattegat (Norway, Denmark, Holland, Great Britain, Hake Bay [Grand Manan]). Depth 56—75 m. 6. Gen. Megamphopus Norm. 1869 Megamphopus (Sp. typ.: M. cornutus), A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.282 | 1894 M., G. O. Sars, Crust. Norway, v.1 p.568. Body slender. Head, lateral lobes projecting. Side-plate 2 in J the largest, 34 and 4th successively smaller. Eyes well developed. Antennae 1 and 2 very slender. Antenna 1 the shorter, with very small accessory flagellum. Mouth-parts as in Eurystheus (p. 610), except that 34 joint of mandibular palp is relatively shorter. Gnathopods 1 and 2 with 5% and 6% joints elongate, strongly developed though weakly subchelate in 9, feebly developed, almost simple, and subequal in 9. In other respects scarcely differing from Eurystheus. 1 species. 1. M. cornutus Norm. 1869 M.c., A.M. Norman in: Rep. Brit. Ass., Meet. 38 p-282 | 1894 M.c., G.O. Sars, Crust. Norway, v.1 p.564 t.200 | 1895 M.c., A. O. Walker in P. Liverp. biol. Soe., .9 p.311 | 1871 Protomedeia longimana, A. Boeck in: Forh. Selsk. Christian., 1870 p.240 | 1876 P.1.,, A. Boeck, Skand. Arkt. Amphip.. v.2 p. 578 t.25 f.4; t.29 £.5 | 1892 P. 1, D. Robertson in: P. nat. Hist. Soc. Glasgow, n. ser. v.3 p.220 | 1878 P. intermedia, T. Stebbing in: Ann. nat. Hist., ser.5 v.2 p. 367 t.15 £.3 | 1888 Podoceropsis (part.)?, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1108 | 1893 P. (part.)?. A. Della Valle in: F. Fi. Neapel, v.20 p. 451. 622 Megamıphopus, Go&sia Head, lateral lobes acutely produced. Side-platel in Q oblong, in JS with an acutely produced and deflexed apex; 24—4th subequal, with 5th a little less deep than 4 in oO; but in d 24 much larger than the rest, 4! smaller than 34, not deeper than 5tk, Pleon segment 3, postero-lateral corners broadly rounded. Eyes rather large, oval, dark brown. Antenna 1 less than '/, as long as body, 1° joint short and thick, as long as 34, 24 much longer; flagellum 8—10-jointed ; accessory flagellum consisting of 1 small joint. Antenna 2 rather longer, antepenultimate joint of peduncle not very short, ultimate rather longer than penultimate; flagellum 10-jointed. Upper lip rounded, middle of margin truncate, bluntly produced in front. Maxilla 1, inner plate with 1 apical seta. Gmnathopod 1 in S, 24 joint slender, 5tk nearly as long, stouter, hind margin ending in a small obtuse tooth; 6%: shorter, oblong oval, palm scarcely defined from short hind margin, finely crenulate, set with spines; finger very long, compressed, its breadth nearly uniform except at the ends. Gnathopod 2 in JS considerably stronger, 24 joint abruptly eurved at base, 5tk stout, long, 6!" somewhat stouter, longer, front margin convex, hind straight, setose; the short palm with a median tubercle; the finger similar to that of gnathopod 1, folding on to surface of 6! joint parallel and close to hind margin. Gnathopod 1 in O, 6: joint nearly as long as 5th, subfusiform; palm but slightly defined; finger slender. Gnatho- pod 2 in © not much stronger, 5!" joint as long as the tapering 6th, in. which the palm is scarcely at all defined. Peraeopods 1 and 2 rather compact. Peraeopods 3—5 more slender, 24 joint oblong oval. Uropod 3, rami longer than peduncle, outer shorter than inner. Telson subquadrate, rather broader than long, with spine at each angle of base of the triangular apex. Colour whitish, pellueid, darkened by red and brown specks. L.5—8 mm. Arctie Ocean, North-Atlantie and adjoining seas (from Lofoten Isles to the Bristol Channel). Depth 11—56 m. 7. Gen. Go6sia Boeck 1871 Goesia (Sp. un.: @. depressa), A. Boeck in: Forh. Selsk. Christian., 1870 p. 231 | 1876 @., A. Boeck, Skand. Arkt. Amphip., v.2 p. 550. Head, lateral lobes little produced. Side-plates of medium depth, 5th not so deep as 4b, the lower margin fringed with setae. Antenna 1 ‚the longer, pedunele shorter than flagellum, accessory flagellum obsolete. Maxillipeds (Goös, in figure), palp 3-jointed. Gnathopod 1 as in Leptocheirus (p. 625). Gnathopod 2 subchelate, but not strongly, setose, the 6tk joint as broad as the 5t%, which is not very elongate. Otherwise as in Leptocheirus. 1 species. 1. G. depressa (Goös) 1866 Autonoe d., Goes in: Öfv. Ak. Förh., v.22 p. 532 t.4l f.32 | 1871 Goösia d., A. Boeck in: Forh. Selsk. Christian., 1870 p.231 | 1876 @.d., A. Boeck, Skand. Arkt. Amphip., v.2 p. 550. Side-plate 1 narrowed below, 24 and 34 deeper than 4b, Pleon segment 3, postero-lateral corners acutely produced. Eyes very small, oval. Antenna 1 more than ?/, as long as body, 24 joint rather longer than 1*%, 3% small; flagellum 20—25-jointed, accessory flagellum not apparent in figure. Antenna 2 much shorter; ultimate and penultimate joints of peduncle subequal; flagellum 10—15-jointed. In the figure 34 joint of mandibular palp is longer than 24, maxilla 1 has a long inner plate devoid of setae, maxilla 2 has the inner plate not fringed on inner margin, and the maxilliped’s “i | | ee Goesia, Protomedeia 623 palp has no finger, but these points are doubtful without description. Gnathopod 1, 34 joint prominent, 3d—6!k strongly setose on hind margin, 5th scarcely so long or broad as 6!%; palm of 6" short, transverse, overlapped by the small pectinate finger. Gmnathopod 2, 24 and 6% joints with very long plumose setae fringing front margin; 5! joint a little longer, not broader, than 6%, widening distally; 6% narrowing to small oblique palm, defined by a strong palmar spine; finger rather strong, curved, smooth. Peraeopods 1 and 2 rather long. Peraeopod 3 short, peraeopod 4 a little, and peraeopod 5 much longer; 24 joint of peraeopods 3—5 narrowly oblong oval. Uropods 1 and 2 rather stout; rami a little unequal. Uropod 3 very short; rami equal, elliptic or ovate, scarcely as long as the short, stout peduncle. Telson very short, twice as broad as long; sides converging to the slightly sinuous apex, which has a pair of plumose setules at each angle. L. 12 mm. Arctie Ocean (Spitzbergen). Depth 9 m. 8. Gen. Protomedeia Kroyer 1842 Protomedeia (Sp. un.: P. fasciata), Kroyer in: Naturh. Tidsskr., v.4 p. 154 | 1855 [Subgen.] Gammaropsis (part.), W. Liljeborg in: Vetensk. Ak. Handl., 1853 p.455 | 1859 Autonoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p. 23. Side-plates rather small, 24 in J larger than 34 or 4b, 5th deeper than 4b, especially in SC. Antenna 1 longer than antenna 2; accessory flagellum well developed. Upper lip, margin rounded. Mandible, molar strong, 34 joint of palp subequal to 2%, very setose. Maxilla 1, inner plate small, with a few hairs on the margin, outer plate with 10 spines; 24 joint of palp long, with truncate apex. Maxilla 2, inner plate not fringed with spines or setae along the inner margin, though there are some scattered hairs; outer plate the longer, widening to the triangular closely fringed apex. Maxillipeds well armed, 4tk joint of palp very short. Gmathopod 1 slender, with 5tk and 6th joints subequal. Gmathopod 2 in S much larger than gnathopod 1, 5tk joint larger than 6"; in oO similar to gnathopod 1 and not much larger. Peraeopods 1 and 2 with slender 6% joint and finger; peraeopod 1, as the gnathopods 1 and 2, very setose. Peraeopods 3—5, 24 joint moderately expanded; peraeopod 4 longer than 34, 5th Jonger than 4th, Uropod 3 the shortest, rami unequal, spinose. Telson rounded, with hook at each side of the broad apex. 1 species. 1. P. fasciata Kroyer 1842 P. f., Kreyer in: Naturh. Tidsskr., v.4 p.154 | 1876 P.f., A. Boeck, Skand. Arkt. Amphip., v.2 p.576 t.25 f.1 | 1884 P. f., J.S. Schneider in: Tromss Mus. Aarsh., v.7 p.124 | 1893 P. f.,-A. Della Valle in: F. Fl. Neapel, v.20 p.435 t.57 £.6,7 | 1894 P.f., G.O.Sars, Crust. Norway, v.1 p.552 t.196 | 1855 Gammarus (Gammaropsis) macrony&, W. Liljeborg in: Vetensk. Ak. Handl., 1853 p.458 | 1859 Autonoe m., R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr. 1 p.29 t.1 f.6 | 1866 Autono& m., Goes in: Öfv. Ak. Förh., v.22 p.531 t. 40 f.51 | 1862 Microdentopus m., Microdeutopus m. + Protomedeia fasciata, Bate, Cat. Amphip. Brit. Mus., p. 167, 379; p. 172. Body rather slender, subdepressed. Peraeon segment 2 much longer in S than in 9. Head, lateral lobes little produced. Side-plate 1 sub- rhomboidal in Q, front corner a little more produced in C, lower margin setose; 24—4th nearly alike in oO; 24ind both broader and more rounded; 5tkin 6) little deeper than 4", in S much deeper and with front lobe more squared. 624 Protomedeia, Xenocheira Pleon segment 3, postero-lateral eorners rotundo-quadrate. Eyes very small, rounded oval, black. Antenna 1 scarcely over half as long as body; 34 joint about half as long as 1° or 24; flagellum much longer than pedunele, about 14-jointed (Sars) (Schneider: 22-jointed); accessory flagellum 5—7-jointed. Antenna 2, ultimate joint of peduncle subequal to penultimate or flagellum, the latter 6- or 7-jointed. Upper lip with apex entire (indented in Sars, figure). Gnatho- pod 1 in S, 24 joint distally widened, 5th rather longer than 6%, which is oblong oval, with short rounded palm overlapped by small finger. Gmnatho- pod 2 in JS, 5th joint very broad, longer than broad, distally truncate; 6th narrower and shorter, yet broadly oval, with strongly serrate hind margin and palm; finger rather strong. Gmathopod 1 in ©, 24 joint not expanded distally; 5% joint searcely longer than 6%, Gnathopod 2 in Q, 24 joint long, slender, fringed on both margins with long plumose setae, 6 joint rather longer than 5t", slightly tapering, palm very short, finger small. Peraeo- pods 1 and 2, 4th joint about as long as 5 and 6tk combined and much wider, in peraeopod 1 this and the 24 joint densely setose; finger as long as 6th joint or longer. Peraeopods 3—5, 24 joint oblong oval, narrowing a little downward. Uropod 3, inner ramus the shorter, both spinose, outer also tipped with a slender seta. Telson about as broad as long, having on either side of the broadiy rounded apical margin a little spine-like hook and 2 or 3 slender spines. Colour whitish with straight brown bands erossing the segments and corresponding blotches on side-plates. L. 8 mm. Arctie Ocean, North-Atlantie, North-Sea, Skagerrak and Kattegat (Greenland, ‚Spitzbergen, Iceland, Finmark |Norway], Sweden, Denmark). Depth 11—73 m. 9, Gen. Xenocheira Hasw. 1879 Xenocheira (Sp. un.: X. fasciata), Haswell in: P. Linn. Soe. N. S. Wales, ©.4 p.272 | 1893, A. Della Valle in: F. Fl. Neapel, 7.20 p.433, 948 | 1881 Xenochira, E. v. Martens in: Zool. Rec., 0.16 Crust. p.31. Side-plates all shallow. Antenna 1 much the longer, 34 joint not elongate; with accessory flagellum. Maxillipeds described as non-unguiculate (palp 3-jointed). Gnathopod 1 subchelate. Gnathopod 2 simple, the 5tk joint broadly expanded in front of the neighbouring joints, and described as arti- «ulating at its base with the 34 joint. Gmathopods 1 and 2 both setose. l species. 1. X. fasciata Hasw. 1879 X. f., Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.272t.11f.6 | 1885 X. /,, Haswellin: P. Linn. Soc. N. S. Wales, 0.10 p.105 t.16 £.1—3. Body slender, perhaps subdepressed; pleon segment 3 the longest. Head, lateral lobes scarcely prominent. Side-plates 1—4 small, 5tk (in figure) nearly as deep, broader. Eyes round. Antenna 1 more than half as long as body, 1° joint rather longer than head, 24a little longer than 1, 3dabout "/, as long as 24; flagellum longer than pedunele. Antenna 2 with longer peduncle; ultimate joint of peduncle shorter than penultimate, longer than the 9-jointed flagellum. Maxillipeds, outer plates and palp with a close fringe of long hairs. Gnathopod 1, 5th joint short, triangular, masked behind by the triangular 4%; 6th twice as long as 5tk, narrow, convex in front, with straight hind margin; finger (in figure, 1885) smooth, small, but over- lapping the short, almost transverse palm. Gnathopod 2, 34 joint subtriangular, artieulating with both 4! and 5th, 5tk with a broad free distal margin, a a ne 1 is De I Ser Mr ae LETTER, g ai Xenocheira, Leptocheirus 625 fringed with setae which reach to end of the long narrow setose 6*"; the narrowly rounded apex of the 6! joint is oecupied by a very small, bent finger. Peraeopod 2 (in figure) slender. Peraeopod 3 (in figure) shorter, with piriform 24 joint. Uropods 1 and 2 armed with a few acute spines. Uropod 3, rami narrow, with marginal spinules and apical setae. Telson scale-like, very short. L. 7 mm. Port-Jackson [East-Australia]. 10. Gen. Leptocheirus Zadd. r 1844 Leptocheirus (Sp. un.: L. pilosus), Zaddach, Syn. Crust. Pruss., p.7.| 1876 L., A. Boeck, Skand. Arkt. Amphip., v.2 p.547 | 1888 L., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1707 | 1893 L., A. Della Valle in: F. Fl. Neapel, v.20 p.426 | 1894 L., G. O. Sars, Crust. Norway, v.1 p. 554 | 1853 Leptochirus (non Germar 1824, Coleoptera!), J. D. Dana in: U. S. expl. Exp., v. 13m p.910 | 1853 Ptilocheirus (Sp. un.: P. pinguis), Stimpson i in: Smithson. Contr., ©.6 nr.5 p.55 | 1871 Boeckia (Sp. un.: B.typica), A.W. Malm in: Öfv. Ak. Förh., v. 97 p: 543. Body not strongly compressed. Pleon segment 3 the longest. Head without conspieuous rostrum. Side-plate 2 the largest,. sometimes entirely concealing the 1°; side-plate 5 with front lobe much deeper than the hind one. Antenna 1 the longer, 34 joint of peduncle not exceptionally long, accessory flagellum usually present. Upper lip subquadrate, faintly emarginate. Lower lip said to have the inner lobes sometimes partially coalesced. Mandible with 6—16 spines in spine-row, 1° joint of palp not much shorter, 34 rather longer than 2%. Maxilla 1, inner plate rather large, usually only with 1 seta at tip, outer with 11 spines (L. pinguis), but perhaps more commonly 10 (said to have 14 in Boeckia typica = L. hirsutimanus). Maxilla 2, inner plate the shorter, narrowed distally, fringed on inner margin. Maxillipeds, inner and outer plates well developed, but rather narrow, finger of palp short, obtuse. Gnathopod 1, 24 joint fringed on front, 3@—6tk on hind margin; 34 hulging behind; 6tk with palm well or ill-defined but short, finger short. Gnathopod 2 simple, 24, 5tk and 6tk joints with long fringes in front, 5th longer than the tapering 6!"; finger weak. Peraeopods 3—5, 24 joint expanded; peraeopod 5 much the longest. Uropods 1 and 2, peduncle produced into a long spine-like apical process, rami robust, spinose. Uropod 3, rami short, longer than peduncle. Telson short. 8 species aecepted, 1 obscure. Synopsis of accepted species: Gnathopod 1 longer and much stouter than N AT A a BE AA 1. L. cornuaurei. . . . p.626 Gnathopod 1 not longer and not much stouter than gnathopod 2 — 2. pP Antenna 1 without accessory flagellum . . . 2. L.aberrans. .... p. 626 3 Antenna 1: with accessory flagellum — 3. Br a N 8... DIDRUIS 0 5 0% p- 627 Side-plates 1—4 without spiniferous serrations of hind margin — 4. Pleon segment 4 not dentate. . ...... 4. L. hirsutimanus . . p.627 4 Pleon segment 4 dentate — 5. Pleon segment 4 with 2 dorsal teeth — 6. Pleon segment 4 with 3 dorsal teeth — 7. Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 40 | Side-plates 1—4 with spiniferous serrations of 2 626 Leptocheirus Side-platel, lowerfrontcornerstrongly produced 5. L. dellavallei ... . . p.628 6 Side-plate 1, lower front corner not strongly EP EEE En‘ 6. L. peetinatus . . . . p. 629 Pleon segment 4, teeth small; eolour tawny win rk apble: 242: 0 ee 7. L. guttatus . .». . p- 629 Pleon segment 4, teeth large; colour yellow wich dark ibanda ee 8. L. trieristatus . . . p.629 1. L. cornuaurei Sowinski 1898 L. c., Sowinski in: Möm. Soc. Kiew, v.15 p.470 1.9 1.928. o unknown. — d. Side-plate 1 oblong, with rounded margin, 24 large, distally much widened and outdrawn. Antenna 1, 24 joint much longer and narrower than 1°, 3 more than '/, as long as 2%; flagellum and accessory flagellum missing. Antenna 2, flagellum ’/, longer than ultimate joint of peduncle, of 12 joints, the last rudimentary. Mandible with spine-row of 6 spines. Maxilla 1 with a single seta on inner plate. Gmnathopod 1 thicker and longer than gnathopod 2; 24 joint comparatively short and strong, narrowed at base, (in figure without setae on front margin), 4" much narrower than 34, 5th stout, not twice as long as broad, a little shorter and narrower than the oblong 6tk, which also is not twice as long as broad; palm rather oblique, not strongly defined, matching the stout finger; joints 3—5 densely setose on hind margin, but 6tk joint not densely. Gmathopod 2 of much the same structure as in L. guttatus (p. 629); 4% joint subequal in length to the tapering 6*", which is only sligehtly shorter than the 5%; all with the usual armature; finger small. Peraeopods 1 and 2, 6% joint a little shorter and much narrower than 4th, finger half as long as 6%. Peraeopods 3—5, 24 joint well expanded, in peraeopod 3 narrowed distally; 6% joint longer than 4, finger short. Uropod 2, rami with few spines; in uropod 3 both rami ending with a group of setae. Telson broader than long, the apical margin concave, crenulate, with 2 pairs of setules. L. 5 mm. Bosphorus (Golden Horn [Constantinople)). 2. L. aberrans (Ohlin) 1895 Protomedeia a., Ohlin in: Acta Univ. Lund., v.31 nr.6 p.53 f.7—14. Body slender, but back tolerably broad, rounded. Head, lateral corners produced, subacute. Side-plate 1 as deep as 24 but only half as broad, 24 larger than 34 or 4h, 5th with front lobe little deeper than hind one. Pleon segment 3,. postero-lateral corners produced into a small acute tooth. Eyes apparently absent. Antenna 1 longer than 24, longer than half the body; 1° joint a little shorter than 24, 34 about /, length of 24; flagellum rather longer than peduncle, 11-jointed; accessory flagellum absent. Antenna 2 */,—'/; shorter than antenna 1; antepenultimate joint of peduncle broad, ultimate and penultimate joints equal and together as long as the 5-jointed flagellum. Gnathopod 1, 24 joint shorter than 5th and 6tk combined, fringed on front margin, 3% bulging behind, with very long subapical setae, 4! not . longer than 34, 4th__6tk fringed on hind margin, 6% as long as 5th, a little wider, narrowly oblong; the short palm nearly transverse, a little overlapped by the finger. Gnathopod 2, 24 joint fringed on front with very long setae, 5th considerably longer than 6!, 6th with palm very oblique, ill-defined except by a palmar spine; finger smooth, rather stout, as long as palm. Peraeopods 1 and 2, finger long, acute, as long as 6" joint. Peraeopod 5 the longest, nearly as long as body, 24, 4th and 5th joints equal, 6b nearly REN RE NN Ka A Leptocheirus 627 as long as 4 and 5th dombined. Uropods 1—3, peduncle in all reaching a little beyond the telson. Uropod 3, rami short, not longer than distal breadth of peduncle, outer very little the longer, each with 4 apical setae. Telson short, broader than long, faintly emarginate. L. 5 mm. Baffıns Bay (lat. 73°N.). Depth 22—32 m. 3. L. pinguis (Stimps.) 1855 Ptilocheirus p., Stimpson in: Smithson. Contr., v.6 nr.5 p.56 | 1888 Leptocheirus p., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 279 | 1893 L.p., A. Della Valle in: F. Fl. Neapel, v.20 p.432 t.57 £.1—3 | 1894 L.p»., G. O. Sars, Crust. Norway, v.1 p.555 | 1862 Protomedeia fimbriata (Gammarus fimbriatus Stimpson in MS.) + P.p., Bate, Cat. Amphip. Brit. Mus., p.169 t.81 f.1; p.170 t.31 £.2. Body very broad anteriorly, narrowing behind, peraeon not much compressed, with back only slightly vaulted; peraeon segment 1 in d as long as 24 and 34 combined, in © only as long as 24; pleon segment 4 produced on each side to an obtuse dorso-lateral tooth or angle, 5!" and 6th with similar projeetions, more acute, accompanied by several spinules. Head broader than long. with minute rostrum; lateral lobes produced, not large, rounded. In o side-plate 1 linguiform, strongly produced forward, obtusely pointed; 1%°—4tk with hind margin serrate, spiniferous; 24 overlapping only a small part of the 1%, deeper and much broader than 1° and deeper than broad; 34 and 4 as deep as 24 but less broad; 5t with front lobe narrow, distally narrowed, less deep than 4"; 6tk and 7% very small. In S (Stimpson) side-plate 1 large, subrhomboidal, 24 much the largest, projecting downward, - furrowed along the middle. Pleon segment 3, postero-lateral corners a little obtusely quadrate. Eyes obliquely oval, or reniform, dark. Antenna 1 scarcely half as long as body; 1° and 24 joints rather long, equal, 34 about "/, as long as 24; flagellum longer than peduncle, more than 23-jointed, accessory flagellum 8-jointed. Antenna 2 a little shorter, ultimate joint of peduncle shorter than penultimate, scarcely as long as the 14-jointed flagellum. Upper lip with pointed process at each upper angle. Mandible with 15 or 16 spines in the spine-row. Maxilla 1, outer plate with 11 spines. Maxillipeds, outer plates with inner margin densely fringed, the spines slender. Gmnatho- pod 1, 6% joint as long as 5tk, gently widening to the transverse, convex, 'setulose palm, over which the denticulate finger is closely fitted without quite reaching the angle. Gnathopod 2, besides the usual fringes the 4% joint has long setae on lower front margin; 5th and 6th are densely fringed on hind margin; 6!% much more than half as long as 5", only a little tapering but without palm, about twice as long as the slender setulose finger. Peraeopods 1 and 2, 4 joint longer than 5tk or 6. Peraedpods 3—5, 24 joint broadly oeblong oval. Pleopods, peduncle short, coupling spines 2, with dentate margins, rami very long, inner with 30 joints, outer considerably -.‚shorter, with 28. Uropods 1 and 2, rami a little unequal, not especially robust, rather longer than peduncle, its process not being included. Uropod 3, process of peduncle short. Telson very short, broader than long, centre of apex convex; each angle raised, carrying an oblique surface row of spinules, while higher up on each side, the surface has a row of 5 spines. Colour, transverse bands of dark grey on a light ground, antennae and legs white, except expansion of 24 joint in peraeopods 3—5. L.reaching 16 mm. North-Atlantic (New England and north to Labrador). Low-water mark to at least ren. 4. L. hirsutimanus (Bate) 1862 Protomedeia hirsutimana, Bate (& Westwood), Brit. sess. Crust., v.1 p.298 f. | 1862 P. hirsutimanus, Bate, Cat. Amphip. Brit. Mus., p-168 1.80 £.6 | ?1866 P.h., Cam. Heller in: Denk. Ak. Wien, 0.2611 p.34 | ?1866 40* Be a Eat a Sl ei, % Far ae © a ae > ea no oe 628 : Leptocheirus P. h., E. Grube in: Arch. Naturg.. «.321 p.402 | 1887 Ptilocheirus h., Ohevreux in: Bull. Soc, zool. France, v.12 p.309 | 1888 Leptocheirus h., T. Stebbing in: Rep. Voy. Challenger, v.29 p.561 | 1895 L. h., A. O. Walker in: P. Liverp. biol. Soc., v.9 p.310 | 1895 L. h., A. O. Walker in: Ann. nat. Hist., ser.6 v.15 p.469 | 1871 L. pilosus (non Zaddach 1844!), A. Boeck in: Forh. Selsk. Christian., 1870 p.230 | 1894 L. p., 6.0. Sars, Crust. Norway, v.1 p.555 t.197 | 1871 Boeckia typica, A. W.Malm in: Öfy. Ak. Förh., v.27 p.544 t.5 f.1, lag. Body rather stout, somewhat compressed, but back broadiy rounded; pleon without teeth. Head, lateral lobes rounded, little prominent. Side- plate 1 very small, acutely quadrate, covered by the very large, greatly produced, in front broadly rounded 24 side-plate; 34 and 4th narrowly oblong, deep; narrow front lobe of 5! not quite so deep, as 4, Pleon segment 3, postero-lateral corners rounded, slightly erenulate above. Eyes small, rounded, dark. Antenna 1 not nearly half as long as body; 1° joint slightly longer than 24 or equal to it, 34 half as long as 24; flagellum 16 —20-jointed; accessory flagellum 4—6 jointed. Antenna 2 rather shorter; ultimate and penultimate joints of pedunele subequal; flagellum 9-jointed. Gnathopod 1, 5t% joint not twice ‘as long as 6%, which is broader distally, with short palm and small finger (Boeck), or: 6! (in Q) about as long as 5th and scarcely broader, palm somewhat oblique, finger (in figure) matching or scarcely overlapping it (Sars). Gnathopod 2, 5t" joint more than twice as long as 6", long oval, junction with 6!" a little oblique, 6 tapering; finger short, nearly straight, setuliferous. Peraeopods 1 and 2, 24 and 4! joints moderately wide, 6! long aud narrow, finger short, slender, scarcely more than ’/, as long as 6! joint. Peraeopod 3, 24 joint narrowed distally, front very convex, hind margin very sinuous; 5% joint longer than 4 or 6th; finger very small. Peraeopods 4 and 5 successively longer; 24 joint oblong oval and as in peraeopod 3 fringed behind with plumose setae; finger short, bidentate. Uropods 1 and 2 unusually strong, especially the 24, which have short broad peduncle, rami very stout, each with double row of stout spines. Uropod 3 very small, rami a little longer than peduncle, tapering, with lateral spines and apical setae. Telson rather broader than long, with a spine at each lateral angle of the apex. Colour dark grey, with lighter flecks of various sizes. L.8 mm. North-Atlantie with adjoining seas (from Norway to France). 5. L. dellavallei Stebb. 1864 Protomedeia fasciata (non Kroyer 1842!), A. Costa in: Annuario Mus. Napoli, v.2 p.155 t.2 £.8 | 1893 Leptocheirus pilosus (part., non Zaddach 1844!); A. Della Vallein: F. Fl. Neapel, v.20 p.427 t.4 f.10; t.12 £.1—14 | 1899 L. dellavallei, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 350. Body rather slender, pleon segment 4 with 2 dorso-lateral teeth and perhaps a median one, all accompanied by spinules. Side-plate 1 with lower front angle produced into a long acute process, length and acuteness a little variable. Side-plate 2 very large, broader than deep, rounded in front. Eyes round. Antenna 1, 1% joint stout, 24 a little longer, 34 rather over !/), as long as 24; flagellum about 12-jointed; accessory flagellum 2-jointed, as long as 1° joint of primary. Antenna 2 much shorter, ultimate and penultimate joints of peduncle equal. Gmathopod 1, 5tk joint longer than 64, which is oblong, a little widened near the short truncate palm; finger curved, reaching beyond the palm, with a decurrent spine near the apex. Gnathopod 2 nearly as in L. hirsutimanus (p. 627), but 5tk and 6th joints rather narrower, 6tk more than half as long as 5th, Peraeopods 1 and 2, 6 joint long and slender, finger nearly as long or (Della Valle) even longer. „2 72 24 Soc u Pi CE BASE I u a a 2 Leptocheirus 629 Peraeopod 3, 24 joint broadly oval, both margins convex (in figure); 4th joint longer than 5% or 6th; finger small. Peraeopods 4 and 5, 24 joint broadly oval; peraeopod 5 much the longest. Uropods 1—3 reaching nearly the same level, the rami long, unequal, the spines long and slender. Uropod 1, rami slender, longer than pedunele. Uropod 2, pedunele rather short, as in uropod 1 with long apical spine, rami longer than peduncle, the longer also much the stouter. Uropod 3, peduncle with tooth at inner angle, rami longer than pedunele. Telson broad, but short, lateral angles of apex very prominent, each with a spine, the apex triangular, produced to an obtuse point. Colour lemon-yellow, sprinkled with many red-brown spots. L. 6—7 mm. Bay of Naples. Depth 10—20 m. 6. L. pectinatus (Norm.) 1869 Protomedeia pectinata, A.M. Norman in: Rep. Brit. Ass., Meet.38 p.283 | 1887 Ptilocheirus pectinatus, Chevreux in: Bull. Soc. zool. France, v.12 p.309 | 1888 Leptocheirus p., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1707 | 1894 L.p., G. O.Sars, Crust. Norway, v.1 p.555 | 1893 L. pilosus (part.), A. Della . Valle in: F. Fl. Neapel, v.20 p.427 | 1895 L.p., A. O. Walker in: P. Liverp. biol. Soe., v.9 p.310, - Agreeing with L. dellavallei (p. 628) except in the following partieulars. Side-plate 1 quadrate, lower front corner scarcely produced, slightly obtuse, Antenna 1, 34 joint °/, (sometimes less) as long as 2%; flagellum about 10-jointed. Antenna 2 relatively longer, the ultimate and penultimate joints of peduncle being more elongate. Peraeopods 1 and 2 with 6!% joint and finger not quite so long and slender as in L. dellavallei. Peraeopods 3—5 probably in agreement with that species. Uropods 1—3, spines seemingly less elongate. Uropod 3, tooth at inner angle of peduncle more produced. Telson, apical border between the prominent angles not triangular but gently convex. L. about 5 mm. North-Atlantic (Shetland Islands). 7. L. guttatus (Grube) 1864 Protomedeia guttata, E. Grube in: Jahresber. Schles. Ges., v.41 p.63 | 1866 P. g., E. Grube in: Arch. Naturg., 0.321 p.408 t.10 f.3 | 1888 Leptocheirus guttatus, T. Stebbing in: Rep. Voy. VRRMAngeT, v.29 p. 366 | 1894 L. g., G. O. Sars, Crust. Norway, v.1 p. 555. ©. Pleon segment 4 with 3 medio-dorsal small teeth, the 2 lateral teeth produced further back than the middle one. Side-plates 1—4 not so deep as in L. hirsutimanus (p. 627). Side-plate 1 (figure) quite clear of side- plate 2, which is subequal to 34 or 4; 5th produced a little below 4fk, Eyes suborbieular. Antenna 1 almost '/, as long as body; 1° and 24 joints equal; flagellum 7-jointed, accessory flagellum not perceived. Antenna 2 not much shorter, flagellum 3-jointed. Gmathopod 2, 5tt and 6tk joints less elongate than in L. hirsutimanus; finger as slender. and acute as, though less long than, that of peraeopod 1. Peraeopods 1 and 2, 4!" joint sub- quadrate. Peraeopod 3 short, 24 joint oval. Peraeopod 5 much longer than preceding peraeopods, but not extremely elongate. Colour tawny, with round spots, few but large and conspicuous, of bright reddish brown in tranverse bands on the head and segments (1% of peraeon and last 4 of pleon excepted), ineluding side-plates and 24 joint of peraeopods 3—5. In other respects the species is said to resemble L. hirsutimanus. L. 5 mm. Adriatie. 8. L. trieristatus (Chevreux) 1886 & 87 Ptilocheirus t., Chevreux in: Bull. Soc. zool. France, v.11 p.XL; 0.12 p.310 t.5 £.3, 4 | 1888 Leptocheirus t., T. Stebbing in: Rep. Voy. Challenger, 0.29 p.1708 | 1894 L.t., G. O. Sars, Crust. Norway, v.1 p. 555. a ee er 3 A er 630 Leptocheirus, Isaeidae, Isaea Body more elongate and side-plates smaller than in L. hirsutimanus, pleon segment 4 with 3 medio-dorsal, sharp and strong teeth. Pleon segment 3, postero-lateral corners strongly rounded, margin slightly erenulate. Eyes small, oval, black. Antenna 1, 2@ joint longer than 1*, 34 scarcely half as long as 24; aecessory flagellum 3-jointed. Antenna 2, ultimate joint of pedunele shorter than penultimate. Gnathopod 1, 6% joint as long as 5th, widening to the finger, which is as long as the palm (im figure: 6! joint oval with scarcely defined palm). Gnathopod 2, 24 joint almost as long as 3d—6th combined, setae still longer; 4, 5tk and 6th in length equal one to the other (in figure: 5tk much longer tham 4% or 6b); finger slightly curved. Uropods 1 and 2, peduncle with strong apical spine. Uropod 2, inner ramus the longer, with 5 large teeth at the apex. Uropod 3 very short, rami laminar, outer with apical setae, inner shorter, with apical tooth. Telson prismatic, strongly eoncave above. Colour simply yellow or with dorsal brown bands. L. 7 mm. France (South-West of Brittany). L. pilosus Zadd. 1844 L. p., Zaddach, Syn. Crust. Pruss., p. 8. Probably identical with one or other of the species here described. L. 4 mm. Baltie. 35. Fam. Isaeidae 1853 Subfam. Isaeinae, J. D. Dana in: U. S. expl. Exp., v. 13ır p. 913. Side-plate 5 the largest. Antenna 1, accessory flagellum well developed.» Gnathopod 2 the larger, subchelate. Peraeopods 1 and 2 .not glandular. Peraeopods 1—5 subchelate, 32 — 5% equal. Uropod 3 biramous. Telson simple. Marine. l genus with 1 species. 1. Gen. Isaea M.-E. 1830 Isaea (Sp. un.: T. montagui), H. Milne Edwards in: Ann. Sei. nat., 0.20 p. 3880 | 1893 I, A. Della Valle in: F. Fl. Neapel, vu 20 p.679 | 1862 I., Iscoea, Bate, Cat. Amphip. Brit, Mus., p. 122; t. 22 £.1. Body robust. Side-plate 5 as deep as the 4b, Antenna 1 the longer, with well developed accessory flagellum. Maxilla 1, outer plate with 11 spines . (Della Valle, in figure). Gnathopods 1 and 2 subchelate, 24 stronger. Peraeo- pods 1—5, 6% joint distally dilated. Uropod 3 not elongate, rami equal, narrow. I species. 1. I. montagui M.-E. 1830 I. m., H. Milne Edwards in: Ann. Sei. nat., v.20 p- 380 | 1840 I. m., H. Milne Edwards, Hist. nat. Crust., v.3 p.26 t.29£.11 | 1862 I.m, Iscoea montagua, Bate, Cat. Amphip. Brit. Mus., p.122; t.22 f.1 | 1887 Isaea montagui, Chevreux in: Bull. Soe. zool. France, v.12 p.301 | 1893 I. m., A. Della Valle in: F. Fl. Neapel, ».20 p. 679 t.6 f.7; t.13 £.30--42. Head, lateral lobes not strongly produced. Side-plates I—5 rather deep. Eyes erimson. Antenna 1, 1% joint a little shorter than 24, 34 about ”/, as long as 24; flagellum subequal to peduncle, 16-jointed; accessory flagellum 6-jointed. Antenna 2, ultimate joint of peduncle rather shorter than penultimate and than the 8—12-jointed flagellum. Upper lip rounded. Mandible, a un 0) un und} ae Sn Eee De Isaea, Ampithoidae, Ampithoe 631 34 joint of palp as long as 2%. Maxilla 1, inner plate with pointed apex, and no conspieuous seta. Maxilla 2, inner plate fringed. Maxillipeds well armed, finger as long as 34 joint. Gmnathopod 1 small, 5" joint as long as the oval 6%; finger matching the oblique convex palm. Gnathopod 2, 5th joint cup-shaped, 6'% robust, palmar margin rather oblique, divided into 4 teeth; finger robust. Peraeopods 1 and 2, 24 joint narrow. Peraeopods 3—5, 24 joint well expanded, especially in peraeopod 3. In all peraeopods the dilated 6% joint has a sort of oblique, serrate palm, set with strong spines, whereby these limbs acquire a subchelate character. Uropods 1—3, rami subequal, spinose. Uropod 3 the shortest, the slender pointed rami about as long as peduncle. Telson shorter than peduncle of uropod 3, its apex rather abruptly pointed. Colour reddish yellow, more or less in transverse bands. L:5 mm. North-Atlantice and Mediterranean (from Great Britain to the nn On Mamaia squinado (Herbst). 36. Fam. Ampithoidae 1899 Amphithoidae, T. Stebbing in: Ann. nat. Hist., ser.7 v,4 p. 211. Head, lateral lobes not very prominent. Side-plates regular; 4% with hind margin not excavate; 5!" with broad front lobe, as deep as 4th (Fig. 109 p. 642). Antenna 1 with 34 joint short; accessory flagellum wanting or small. Lower lip (Fig. 108 p. 636) with front lobes deeply notehed. Mandibular palp stout, slender, or wanting; molar usually well developed. Mouth-parts otherwise as in Aoridae (p. 585). Gnathopods 1 and 2 not simple, 24 usually the larger, usually larger in J than in Q and more or less differently shaped. Peraeopods 1 and 2 glandular. Peraeopod 3 reverted. Peraeo- pod 5 the longest. Uropods 1—3 biramous. Uropod 3 with short rami, the outer uncinate. Telson simple (Fig. 110 p. 643). Marine. 6 genera, 22 accepted species and 19 doubtful. Synopsis of genera: Mandible with palp — 2. l H Mandible without palp —- 5. Antenna 1 (Fig. 109) without accessory fla- 2 gellum — 3. Antenna 1 with accessory flagellum — 4. Peraeopods 3—5, 6th joint not strongly widened ee a N N l. Gen. Ampithoe . . . p.631 Peraeopods 3—5 (Fig. 109), 6th joint strongly wu. WIGBBSE BE SDOE een 2. Gen. Pleonexes. . . p.642 4 { Uropod 3, outer ramus with 2 hooks . . . . 3. Gen. Grubia . - . . p.644 Uropod 3, outer ramus with 1 hook . . . . 4. Gen. Amphithoides . p. 645 5 | Mandible, molar well developed... ... . . 5. Gen. Sunamphitoe . p.645 Mandible, molar evanescentt -.-...... 6. Gen. Biancolina . . p.646 1. Gen. Ampithoe Leach 1813/14 Ampithöe (Sp. un.: A. rubricata), Leach in: Edinb. Ene., v.7 p.403, 432 | 1829 Ampithoe, Latreille in: G. Cuvier, Regne an., n. ed. v.4 p.121 | 1816 Oymadusa (Sp. un.: C. filosa), Savigny, M&m. An. s. Vert., v.1 p.109 | 1816 Amphithoe, Latreille in: Nouv. Diet., ed.2 v.1 p.470 | 1825 Amphithoe, A. G. Desmarest, Consid. gen. Crust., 632 Ampithoe p- 268 | 1849 Amphithöe, J.D. Dana in: Amer. J. Sci., ser.2 v.8 p.137 | 1862 Amphithoe (part.), Bate, Cat. Amphip. Brit. Mus., p.233 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1113 | 1893 Amphithoe (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 454 | 1894 Amphithoe, G. O. Sars, Crust. Norway, v.1 p.578 | 1836 Amphitoe, Gu£rin- Möneville, Iconogr. Rögne an., v.8 Crust. p.23 | 1840 A. (part.), H. Milne Edwards, _ Hist. nat. Crust., v.3 p.28 | 1845 Amphitöe, H. Goodsir in: Ann. nat. Hist., v.15 p.75 | 1852 Amphitoe, J. D. Dana in: P. Amer. Ac., v.2 p. 213. Head without rostrum. Side-plates 1—5 well developed, 5th as wide as 4b, with a very small hind lobe. Antenna 1 without accessory flagellum, usually longer than antenna 2, though with shorter peduncle. Mouth-parts prominent below the head.‘ Upper lip distally rounded. Lower lip (Fig. 108 p. 636), inner lobes well developed; outer lobes bifid; mandibular processes prominent. Mandible normal, prineipal and secondary plate multidentate, spines in spine-row numerous, molar of moderate size; 34 joint of palp sometimes widened distally and crowded with setae, at others not widened and slightly armed. Maxilla 1, inner plate very small, usually with 1—3 setae, outer plate with 10 spines; 24 joint of palp with several apical spines. Maxilla 2, outer plate the larger, inner distally narrowed, inner margin fringed. Maxillipeds, outer plates large, well fringed with spine-teeth; palp not very elongate. Gnathopod 1 subchelate, usually the smaller. Gnatho- pod 2 usually subchelate, stronger in JS than in Q and generally of a different sbape. Peraeopods 1 and 2, 24 joint expanded, sometimes greatly, for the cement-glands, the secretion from which issues through the apex of the finger to supply fibres for constructive purposes. Peraeopods 4 and 5 longer than the others. Uropod 3, outer ramus carrying 2 reverted spines. Telson short, usually or always having the angles of the apex minutely hooked. Among algae; occasionally also on floating algae. 17 accepted species, 14 obseure. Synopsis of accepted species: Gnathopod 1 in & larger than gnathopod 2. 1. A. megaloprotopus. p. 6383 Gnathopod 1 in S smaller than gnathopod 2—2. Gonathopod 2 in S chelate .. . .. 2... 2. A.lacertosa . . . . p.638 Gnathopod 2 in & subchelate — 8. 1 2 Peraeopods 1 and 2, character of 2d joint not known — 4. Peraeopods l-and 2, 24 joint broadly expand- ed — 8. Peraeopods 1 and 2, 2d joint not broadly ex- panded — 11. A [ Gnathopod 2 in d, palm oblique — 5. Gnathopod 2 in d, palm transverse — 6. Gnathopod 2 in 2, palm with tuberele near finger- -hinge REBEL a Ne Re 3. A.cinerea. .... p. 684 Gnathopod 2 in 2, palm with prominence at Beiein an ai N e 4. A.longimana . . . p.634 Gnathopod 2 in d, palm simply eoncave . . 5. A. quadrimana. . . p.685 ® Gnathopod 2in d, palm margin diversified — 7. Gnathopod 2 in d, palm with broad, low, median :tonth ars a ag 6: 9. vVande wiss p- 685 Gnathopod 2 in d, palm with narrow, bifid, median toolh.i.. a See 7. A. mitsukurii . . . p.635 Re u a ca # E 1 F - Ampithoe 633. Peraeopods 1.and 2, 2d joint with lower half > Berrower Khan upper > ...... = cn.» 8. A. flindersi . . . . p.685 , Peraeopods 1 and 2, 2d joint with lower half not narrower than upper — ®. 9 Gnathopod 1, 5th joint longer than 6th ... 9. A.humeralis ... . p.636 Gnathopod 1, 5th joint shorter than 6th — 10. 10 Gnathopod 2 in S, 6th joint acuminate . . . 10. A. femorata . . . . p.636 Gnathopod 2 in JS, 6th joint subovate. . . . 11. A. brevipes . . . . p.637 Gnathopod 1, 6th joint much wider than 5th. 12. A. brasiliensis. . . p.637 11 | Gnathopod 1, 6th joint not much wider than 5th — 12. Maxilla 1, inner plate with several setae . . 13. A. kergueleni . . . p.688 12 Maxilla 1, inner plate with 1 seta or very few — 13. 13 Gnathopod 1, 5th joint longer than 6th. . . 14. A.japonica . .. . p.638 Gnathopod 1, 5th joint shorter than #th — 14. defined by a conspieuous tooth . . .. . 15. A. vaillantü . . . . p.63% Gnathopod 2 in d, palm not deeply emarginate, not defined by a tooth — 15. 15 Antenna 1, 34 joint not very short... . . 16. A. rubricata . . . . p.639 Antenna 1, 8d joint very short . . ..... 17... man 2 p- 640 Gnathopod 2 in d. palm deeply emarginate, 1 1. A. megaloprotopus (Stebb.) 1895 Amphithoe m., T. Stebbing in: Ann. nat. Hist., ser. 6 v.15 p.397 t.14, 15B. Side-plate 1 very large, oblong with rounded angles, produced forward so as completely to cover the mouth-parts; side-plate 2 not half as large. Eyes rather small, rounded, black (in spirit). Antenna 1, 1° joint strongly setose below, 2% much thinner, a little shorter, 34 small; flagellum longer than pedunele, with more than 23 joints. Antenna 2, penultimate joint of peduncle long. Mandible, 5 or 6 spines in the spine-row, 34 joint of palp nearly as long as 24 and 1° combined. Maxilla 1, inner plate with 3 small setae on inner margin. Maxillipeds, base very stout. Gnathopod 1, 24 joint narrow, channelled in front, with prominent distal lobe, 5?" cup-shaped, short, 6th massive, as long as 24, oblong, with rather convex front; palm nearly trans- verse, a little concave, sharply defined, a little overlapped by the finger. Gnathopod 2 like gnathopod 1, but 6tk joint rather shorter and narrower, palm more sinuous, the short, curved finger elosing down within its defining point. Peraeopods 1 and 2, 24 joimt narrowly oval. Peraeopods 3 and 4, 24 joint broad. Peraeopod 5, 24 joint narrower in proportion to length than in peraeopods 3 and 4, but only constricted close to distal end. Branchial vesicles broadly flask-shaped. Pleopods with 2 coupling-spines, 6 cleft spines, rami 17—19-jointed. Uropods 1 and 2 spinose. Uropod 3, rami little more than half as long as peduncle, with the usual 2 upturned spines on outer ramus. Telson slightly broader than long, with lateral setules, apex bluntly triangular between 2 small upturned hooks, with a backward pointing seta adjoining each hook on inner side. L. about 11 mm. Tropical Atlantie (Antigua). From sea-weed on rocks. 2. A.lacertosa (Bate) 1858 Amphithoe l., Bate in: Ann. nat. Hist., ser.8 v.1 p-362 | 1862 A.1., Bate, Cat. Amphip. Brit. Mus., p.236 t.41 £.5 | 1893 A.l., A. Della Valle in: F. Fl. Neapel, v.20 p.461 t.57 £. 37. 634 Ampithoe Side-plate 1 very large, extending forward to front of head, 2 much smaller. Eyes ovate. Antenna 1 about half as long as body; flagellum a little longer than peduncle. Antenna 2 rather shorter, peduncle not longer than peduncle of antenna 1. Gnathopod 1, 5% joint slightly dilated, longer than 6", 6" not broader than 5t%, ovate, palm oblique, not defined; finger short. Gnathopod 2 much larger, 5!" joint short, cup-shaped, 6'h large, quadrate, hind margin produced so as to form a kind of thumb, though not equalling the finger in length. Peraeopods 1—5, all having the dilated base [24 joint] tapering to the distal extremity. Uropod 3 reaching beyond the other 2 uropods; peduncle (in figure very much thicker than peduncles of uropods 1 and 2 and longer than their rami) with 2 short blunt spines on upper margin, and 5 or 6 on upper part of apex; outer ramus with 2 strong recurved hooks. Telson acute. L. 21 mm. Arctie Seas. 3. A. cinerea (Hasw.) 1879 Amphithoe ec. (2) + A. grandimanus (non A. grandi- ‘mana A. Boeck 1861!) (3), Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.269 t. Il f.4; p. 270 | 1893 A. rubricata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 459. Eyes round, projeeting, almost colourless. Antenna 1 more than half as long as body; 24 joint of peduncle longer than 1%, 34 very short; flagellum much longer than peduncle. Antenna 2 shorter; flagellum shorter than ultimate and penultimate joints of pedunele. Gnathopod 1, 6! joint long ovate, setose, palm oblique, undefined. Gnathopod 2 in S much larger than gnathopod 1; 6% joint broad, irregularly ovoid; palm oblique, deeply excavated, its border waved, defined posteriorly by a strong tooth. Gnatho- pod 2 in oO, 6% joint broader but rather shorter than in gnathopod 1, palm oblique, convex, devoid of teeth, but with a tubercle near finger-hinge. Peraeopods 1 and 2 subequal, stoutish. Peraeopod 3, 24 joint subeircular. Peraeopods 4 and 5, 24 joint oval. Uropod 3 not extending so far as uropod 2; outer ramus short, with 2 hooks, inner slightly longer, broader, with a few short setae. Telson subtriangular, blunt. Colour ashy grey. L. 16 mm. Port Jackson [East- Australia]. 4. A.longimana (S.I. Sm.) 1873 Amphithoö 1., (8. I. Smith in:) A. E. Verrill in: Rep.U. S. Fish Comm., v.1 p.563 | 1893 A. rubricata (part.), A. Della Valle in: F. Fl. Neapel, ©. 20 p.456. Eyes round, black (in spirit). Antenna 1 in J slender, as long as body, 24 joint rather longer than 1°, 34 about half as long as 24; flagellum about twiee as long as peduncle. Antenna 2 stouter, rather shorter; ultimate joint of peduncle considerably longer than penultimate, subequal to flagellum. Antenna 2 in © shorter and more slender. Gnathopods 1 and 2 in J' stout and long. Gnathopod 1 im J, 5tk joint as long as 6th, both setose, 6 much more than twice as long as broad, oblong; palm very short, transverse, much overlapped by stout finger. Gmathopod 2 in C', 5tb joint short, cup-shaped, 6% as long as in gnathopod 1, much broader; palm oblique, with deep sinus close to projecting defining angle. Gnathopod 1 in oO, 5" and 6*h joints shorter, proportionally broader; palm more oblique. Gnathopod 2 in O, 6tk joint short, somewhat oval; palm with slight defining prominenee. Peraeopods 4 and 5, 24 joint with hind margin unarmed. L. 6—9 mm. North-Atlantie (New Jersey, Long Island, Vineyard Sound). Ampithoe ES 635 5. A. quadrimana (Hasw.) 1879 Amphithoe quadrimanus, Haswell in: P. Linn. Soe. N.S.Wales, ».4 p.337 t.21 £.7 | 1882 A. q., Haswell, Cat. Austral. Crust., p. 266 | 1893 A. rubricata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 456. Side-plates 1—7 all very shallow, 1% —4th deeper than 5th—7th, 5th not larger than 6!" (in figure, but in contradietion to the generic definition by Haswell 1882). Eyes small, round. Antenna 1 more than half as long as body; flagellum thriee as long as pedunele. Antenna 2 half as long as antenna 1, antepenultimate joint of peduncle stout, distally produced below to a rounded protuberance; this and ultimate and penultimate joints of peduncle fringed below with plumose setae, flagellum as long as peduncle. Mouth-parts pro- jeeting downward promimently (in figure). Gnathopod 1, 6% joint subquadrate, a little widening distally; palm nearly transverse, not defined. Gnathopod 2, 4 and 5th joints narrow at apex of hind margin, 6th Jarge, subquadrate, twice as long as broad; palm nearly transverse, concave. Uropod 3 reaching beyond uropod 2; outer ramus armed with 3 hooks, inner laminar, with slender spines. Telson armed with about 6 slender spines. L. 6 mm. Port Jackson [East-Australia], 6. A. valida (S. I. Sm.) 1873 Amphithoe v., (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p.563 | 1893 A. rubricata (part.?), A. Della Valle in: F. Fl. Neapel, v.20 p. 459. Eyes round, black (in spirit). Antenna 1 in d, 24 joint little longer than 1°, 34 short, slender. Antenna 2 subequal to antenna 1; ultimate and penultimate joints of peduncle subequal. Gnathopod 1 in JS short, compressed; 5th joint as broad as 6tk, 6th broad, oval, palm and hind margin together nearly & semicirele; finger fitting palm. Gmathopod 2 in J very large; 5th joint small, 6 oblong, distally widened, very large and thickened, outer surface eonvex, inner flattened; palm transverse, with a broad low median tooth, and rounded prominence at the defining angle, within which the stout eurved finger eloses. Gmathopod 1 in © slightly more elongated. Gnathopod 2 in © smaller than in C; palm slightly oblique. Colour bright green. IL. 10-—13 mm. North-Atlantie (New Jersey and Long Island Sound). 7. A. mitsukurii (DellaValle) 189% Amphithoe m., A. Della Valle in: F. Fl, Neapel, v.20 p. 460 t.57 f. 30-32. : Gmathopod 2 in J, 6th joint very large and long, widened distally; palm transverse,: defined by a somewhat produced blunt tooth, and having ' & little tuberele near the finger-hinge, between which and the defining tooth is a bilobed tuberele; finger curved, its apex touching defining tooth of palm. Gnathopod 1 (in figure) with produced side-plates; 5 joint very broad, longer than the oval 6%. Peraeopods 3—5, 6% joint little dilated distally. Telson broader than long, narrowing distally, with ‘almost straight apical margin between the uncinate angles. L. 17 mm. Tokio [Japan]. 8. A. flindersi (Stebb.) 1888 Amphitho& f., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1120 t.118 | 1893 A. rubricata (part.), A. Della Valle ig: F. Fl. Neapel, v.20 p.456. (Juv.?) Side-plate 1 larger than the 24, below obtusely produced forward. Pleon segment 3, postero-lateral corners obtusely quadrate, with shallow indent just above the angle. Eyes small, oval in horizontal direetion. Antennae 1 and 2 defective. Lower lip (Fig. 108 p. 636), outer branch of bifid 636 Ampithoe lobes advanced in front of the inner. Mandible, 3% joint of palp as long as 24, not expanded, with 5 setae (or spines) on apex. Maxilla 1, inner plate with 3 setae on inmer margin; 24 joint of palp with 5 spines on the dentate apex. Gnathopod 1, 5t" joint rather shorter than 6%, distally lobed, 6th oblong, a little widened distally, palm oblique, defined by a palmar spine, the angle rounded off; finger with fine pectination followed by 5 successively larger teeth. Gnathopod 2, 5tk joint eup-shaped, considerably shorter than 6, which is stouter but not longer than in gnathopod 1; palm minutely pectinate; finger as in gnathopod 1. Peraeopods 1 and 2, 24 joint broad proximally, narrower distally, 4! joint widening distally, ae but without rounded lobe. Pleopods with 2 cleft spines, Lower ip. With 8 or 9 joints in the rami. Uropod 1, peduncle little longer than inner ramus, outer the shorter. Uropod 3 reaching beyond the others; peduncle longer than the rami; outer ramus with 2 short hooked spines, inner oval, slightly longer than the outer, edged with 4 or 5 spines or spinules. Telson short, almost cireular, with an upturned corner on either side of the broadly rounded apex. L. about 4 mm. Flinders Passage (lat. 10° S., long. 142° E.). Depth 15 m. 9. A. humeralis (Stimps.) 1864 Amphithoe h., Stimpson in: P. Ac. Philad., p. 156 | 1888 A. h., T. Stebbing in: Rep. Voy. Challenger, v.29 p.351 | 1898 A. h., Calman in: Ann. N. York. Ac., v.11 p.271 t.33. 3 Body robust, rather compressed. Head, lateral lobes rounded. Side- plate 5 large, subquadrate. Eyes small, rounded, dark. Antenna 1 nearly as long as body; flagellum more than twice as long as peduncle (Stimpson). Antenna 1 more than half as long as body; 1° and 24 joints subequal, 34 very small; flagellum 2°/, times as,long as peduncle (Calman). Antenna 2 half - as long as body; flagellum not longer than antepenultimate joint (penultimate?) of peduncle (Stimpson). Antenna 2 stout; ultimate joint of peduncle a little shorter than penultimate; flagellum rather more than 1'/, length of pedunele (Calman). Mouth-parts (Calman) nearly as in A. femorata, but mandibular palp has 34 joint longer than 24 (not so in figure), not expanded. Lower lip with bifid front lobes.. Gnathopods 1 and 2 similar in the two sexes, rather slender, and densely setose. Gnathopod 1, 5tk joint longer than 6th, 6th oblong, about 2'/, times as long as broad, hind margin with shallow distal concavity near angle of very short transverse palm; finger serrate, overlapping palm. "Gnathopod 2, 5th joint slightly longer than 6", lobed behind, 6t1 hardly more than twice as long as broad, palm short, transverse, overlapped by finger. Peraeopods 1 and 2, 24 joint very large, broadly oval, 4! widened distally and lobed. Peraeopod 3 very short, 24 joint broad. Peraeopod 5 much longer than peraeopod 4. Uropod 3 not reaching beyond uropod 2; peduncle thrice as long as rami; outer ramus with 2 hooks, inner lamellate, truncate, bearing setae. Telson small, obtusely triangular, with a few setae on each side. L. 26—30 mm. Puget Sound. About low-water mark. 10. A. femorata (Kreyer) ?1840 Amphitoe gaudichaudü, H. Milne Edwards, Hist. nat. Crust., v.3 p.31 | 1845 Amphithoe femorata, Kreyer in: Naturh. Tidsskr., ser. 2 v.1p.3351.3£.4a—i | 1893 A. rubricata (part.) + Grubia crassicornis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.456; p. 466. km BEA ya Are KB FE aD un & Ampithoe 637 In many respects resembling Sunamphitoe pelagica (p. 645). Body robust, dorsally rounded, smooth. Side-plates (or some of them) with setae on lower margin. Eyes small, subrotund, whitish. Antenna 1 more than half as long as body; 1° joint thick, 24 very little shorter, 3% small; flagellum 30—40- jointed. Antenna 2 shorter, stout, almost pediform; ultimate and penultimate joints of peduncle equal; flagellum scarcely half as long as peduncle, tapering, 12- or 13-jointed. Lips not deseribed. Mandibular palp long, thin; 24 joint the longest, 34 with apical serrulate setae. Maxilla 1, inner plate with 1 seta, outer with 10 spines; palp slender, with 5 or 6 serrate spines. Maxilla 2 and maxillipeds normal. Gnathopod 1, 5% joint shorter than 6t%, lobed and setose on hind margin, 6!" narrowly oblong; palm short, transverse, overlapped by finger. Gnathopod 2 in J considerably larger; 6% joint pretty strongly tapering. Gnathopod 2 in © like gnathopod 1, but with shorter 5th and broader 6! joint. Peraeopods 1 and 2, 24 joint broad, oval, laminar, 4th widened distally. Peraeopod 3 stout, 24 joint broader than long, the following joints stout, not widened, 6!" spinose on both margins; finger short, strong, much curved. Peraeopod 4 longer and more slender, 24 joint long oval, finger fitted for grasping. Peraeopod 5 slightly longer than peraeopod 4. Branchial vesicles oval. Marsupial plates narrow, long, with long setae. Pleopods, rami long, 30-jointed. Uropods 1 and 2, outer ramus shorter than inner, broader, and more spinose, inner of uropod 2 at least as long as pedunele, the rest shorter. Uropod 3 shorter but stouter than uropod 2; peduncle twice as long as rami; outer ramus with the usual 2 hooks, and several rows of microscopie spinules, inner rather shorter but broader, nearly circular, armed with some setae and 2 little stout spines. Telson small, triangular, with 2 setae on the margin. Colour in life a very dark olive-green. L. reaching 19 mm. South-Paeifie (Valparaiso near the shore); Atlantic (Brazil)? 11. A.brevipes (Dana) 1852 Amphithoe b., J.D.Dana in: P. Amer. Ac., v.2 p.216 | 1853 & 55 A.b.+?A. peregrina (juv.), J. D. Dana in: U. S. expl. Exp., v. 1311 p. 936, 941; t. 64 f.5a—n; p. 940 t. 64 f.4a, Ab. | 1862 A. falklandi (juv.?) + A.p. + A. b., Bate, Cat. Amphip. Brit. Mus., p.237 t.41 £.6; p.247 t.43 f.1; p.248 t.43 f.2,2i,2u, lu | 1893 A. rubricata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 456, 459. Apparently very near to A. femorata. Head, lateral lobes very little produced. Side-plate 1 scarcely produced forward, 5tk the largest. Eyes round. Antenna 1 about half as long as body; 1° joint longest; flagellum more than twice as long as peduncle. Antenna 2 much shorter, ultimate and penultimate joints of peduncle equal; flagellum 15-jointed. Mandibular palp rather slender; 34 joint with 5 apical setae. Gnathopod 1, 5th joint shorter than 6*h, 6th oblong; palm short, transverse; finger longer than palm. Gnathopod 2 in JS, 5th joint small, eup-shaped, 6b large, sub- ovate, narrowest at finger-hinge, near to which there is a minute acute tooth; the palm in general being undistinguished from the hind margin, finger long. Gnathopod 2 in © scarcely distinguishable from gnathopod 1. Peraeopods 1 and 2, 24 joint dilated, 4 joint distally lobed. Peraeopods 4 and 5 considerably longer than peraeopod 3. Uropod 3 normal, reaching beyond uropod 2. Telson not described. L. 18 mm. South-Atlantie (Tierra del Fuego, depth 9m; Falkland Islands); South-Paeifie (Valparaiso)? 12. A. brasiliensis (Dana) 1853 & 55 Amphithoe b., J. D. Dana in: U. S. expl. Exp., v. 13m p.943; 1.64 £.6a—n | 1893 A. rubricata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 456. 638 Ampithoe Body compressed. Side-plates large. Antenna 1 much longer than half body; flagellum very long, slender. Antenna 2 a little shorter, hirsute; peduncle hardly shorter than flagellum. Gnathopod 1, 5t& joint (in figure) shorter and much narrower than 6'", 6tk with front margin slightly convex, hind margin and palm (described as oblique-transverse) together making (in figure) a great bulge without any defining mark; finger half as long as 6!" joint. Gmatho- pod 2 not much larger, more hirsute, 5!" joint distally eup-shaped, 6!" oblique- transverse at apex; palm hardly excavate, long hirsute, acute at lower limit (in figure: widening to a slightly oblique, well defined palm, which is very different in appearance from that of gnathopod 1). The mouth-parts and uropod 3 as figured are fairly appropriate to Ampithoe. Maxilla 1 shows no inner plate, but a tuft of 5 setae at the place proper to the inner plate. L. 16 mm. Tropical Atlantie (Rio Janeiro). 13. A. kergueleni (Stebb.) 1888 Amphithoe k., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1116 t.117 | 1893 A. rubricata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 463. 9. Side-plate 1 much widened below. Pleon segment 3, postero- lateral corners obtusely quadrate. General structure in close agreement with A. rubrieata. Eyes rounded oval. Antenna 1, 24 joint rather longer than 1st, 34 more than /, as long as 24; flagellum much longer than peduncle, 33-jointed. Antenna 2 shorter, ultimate joint of peduncle rather shorter than penultimate; flagellum 20-jointed. Lower lip, front lobes bifid but less sharply than in the European species. Maxilla 1, inner plate with many plumose setae on inner margin; 24 joint of palp with 9 spine-teeth round the apex. Gnathopod 1, 5th joint elongate, nearly as long as 6t, 6tk oblong, widening slightly towards the rather oblique, finely pectinate palm, which has a palmar spine at the rounded defining angle; finger overlapping palm, its inner margin cut into 14 teeth. Gmathopod 2, 5% joint much shorter than 6*", distally cup-shaped, 6"% rather broadly oblong; palm oblique, concave, well defined; finger when touching the defining angle not closing the space between its dentate margin and the palm. Other appendages nearly as in A. rubricata. Telson broader than long, narrowing to apex, which forms an almost straight border between the acute corners. L. about 6 mm. — Cd unknown. Southern Indian Ocean (Kerguelen Island). 14. A. japonica (Stebb.) 1888 Amphithoej., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1124 t.138A | 1893 A. rubricata (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.456. Q. Eyes small, irregularly round. Antenna 2, 24 joint longer than 1%, 34 about '/, as long as 24, carıying a little setuliferous (seemingly jointed) tubercle; flagellum much longer than peduncle, attaining to 46 joints. Antenna 2, ultimate joint of pedunele rather shorter than penultimate; flagellum longer than both combined, 25-jointed. Mouth-parts as in A. rubricata. Gnatho- pod 1, 5th joint twiee as long as broad, rather longer than 6%, 6th oblong oval, palm oblique, defined by a palmar spine at the rounded defining angle; finger serrate, a little overlapping the palm. Gmnathopod 2, 5tk joint cup- shaped, shorter but distally rather wider than the 6, 6th oblong, with a convex palm, very slightly oblique, nearly matched by the finger, the apex of which scarcely overlaps it. Peraeopods 1 and 2, 24 joint long, not greatly widened. Peraeopod 3, 24 joint as broad as long, 6t% spinose, its apex on | } h a a Sn Ei Ampithoe 639 the inner side forming 2 small laminar projeetions. Peraeopod 5, 24 joint piri- form. Pleopod 1 having on peduncle about a dozen coupling spines, on 18 joint of inner ramus 9 eleft spines; outer ramus with 22 joints, inner with 23. Uropods 1 and 2 spinose, . peduncle longer than rami. Uropod 3, peduncle much longer than rami, spinose; inner ramus with several spines on margins and some small stout surface spines. Telson scarcely longer than broad, with denticle at each angle of the convex distal margin. L. 14 mm. — Ö unknown. Bay of Kob& [Japan]. Depth 15 m. 15. A. vaillantii (H.Lue.) 1846 Amphithoe v., H. Lucas in: Expl. Algerie, An.artie. v.1 p.54 Orust. t.5 £.3 | 1857 A. penicillata, A. Costa in: Mem. Acc. Napoli, v.1 p. 207 t.2 £.9 | 1866 A.p., Cam. Heller in: Denk. Ak. Wien, v.26n p.48 t.8 f. 29—84 | 1876 A.p., Catta in: Ann. Sci. nat., ser. 6 v.3 nr.1 p.27 t.2 f.2i | 1881 A.p., Nebeski in: Arb. Inst. Wien, ©.3 p.149 t.13 f.42d | 1862 A. desmarestü, Bate, Cat. Amphip. Brit. Mus., p.238 t.41 f.8 | ?1868 A. vaillantii var. pontica, Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.102 t.7 £.19—27 | ?1880 A. erythraea, Kossmann, Reise Roth. Meer., v.2ı Malacost. p.134 t.14 f.12,13 | 1893 A. rubricata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 456. Antennae 1 and 2 equal, setose (Lucas). Antenna 1 in J longer than antenna 2; 1° joint scarcely longer than 24, 34 a third as long as 1%; flagellum twice as long as peduncle, 20—30-jointed. Antenna 2, peduncle long, stout; flagellum short, 18-jointed. Eyes small, rounded, deep brown. Gnathopod 1 elongate, 24 joint distally lobed, 5tk joint distally quadrate, 6th Jonger, setose, oblong; palm straight (Lucas), very short, slightly excavate (Czerniavski), finger long. Gnathopod 2 very long, 24 joint strongly lobed distally; 6% joint with palm deeply emarginate, defined by a conspieuous tooth, the front much longer than the hind margin and (Lucas’ figure) bluntly produced beyond base of the comparatively short, strongly curved, serrate finger (Czerniavski figures a much shorter palm of gnathopod 2 in J, and adds, that in Q gnathopod 1 has the 5t% joint short, palm of 6th not convex, and gnathopod 2 has a broader 5tk joint, the 6b not elongate, nor apically produced). Peraeopods I—5 and uropods 1—3 in agreement with A. rubri- cata. Telson obtusely triangular. Colour yellow, punetate with green or dark spots. L. 12—17 (Lucas), 8—10 mm (Czerniavski). Mediterranean (Algeria, under cast-up algae); Black Sea?, Red Sea? 16. A. rubricata (Mont.) 1808 Cancer (Gammarus) rubricatus, Montagu in: Tr. Linn. Soe. London, v.9 p.99 t.5 f.1 | 1812 Astacus r., Pennant, Brit. Zool., ed.5 v.4 p.33 | 1813/14 Ampithöe rubricata, Leach in: Edinb. Enc., v.7 p.403, 432 | 1874 Amphithöe r., T. Stebbing in: Ann. nat. Hist., ser.4 v.14 p.113 t.11 f.2,2a | 1893 A.r. (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.456 t.2 £.2; t.13 £. 1-17; t.57 £.25,26 | 1894 A.r., T. Stebbing in: Bijdr. Dierk., 0.17 p.44 | 1894 A. r., G. O. Sars, Crust. Norway, v.1 p.579 t.206 | 1827 &28 Gammarus punctatus (non Amphithoe punctata Say 1818!), G. Johnston in: Zool. J., 0.8 p.177,490 | ?1837 Amphitho& picta, H. Rathke in: Möm. pres. Ac. St.-Pötersb., v.3 p. 379 t.5 £.15—19 | 1840 „Amphitoe rouge“, H. Milne Edwards, Hist. nat. Crust., v.8 p.33 | 1843 Amphithoe podoceroides, H. Rathke in: N. Acta Ac. Leop., v.201 p.79 t.4 f.4 | 1876 A.p., A. Boeck, Skand. Arkt. Amphip., v.2 p.588 t.26 f.5; t.27 f.3 | 1846 A. albomaculata, Kroyer in: Naturh. Tids- skr., ser.2 v.2 p.67 | 1846 A.a., Kroyer in: Voy. Nord, Urust. t.11B f. la—u | 1857 Amphitoe littorina, Bate in: Ann. nat. Hist., ser.2 v.19 p.147 | 1862 Amphitho& rubri- cata + A.1. + Sunamphitho& podoceroides, Bate, Cat. Amphip. Brit. Mus., p. 233 t.41 f.1; p. 234 t.41 f.2; p.251 t.43 £.7. 640 Ampithoe Body long, eompressed, but not always slender. Head, lateral lobes blunt. Side-plate 1 bluntly produced somewhat forward, 22—5tk rotundo- quadrate below. Pleon segment 3, postero-lateral eorners obtusely quadrate. Eyes small, rounded oval, dark red. Antenna 1, 1° and 24 joints subequal, 34 Jess than half as long as 24; flagellum slender in O , sometimes twice as long as peduncle, but in S sometimes not longer than pedunele, 23— 35-jointed. Antenna 2 stout, in Q decidedly shorter than antenna 1, but less so in 3; ultimate joint of peduncle as long as penultimate; flagellum about half as long as peduncle in Q, less than that in JS, 9—15-jointed. Lower lip, outer part of bifid lobe distally rounded. Mandible, 34 joint of palp longer than 24, widening distally and densely beset with setae on apex and distal part of inner margin. Gmathopod 1, 24 joint lobed at apex of channelled front, 5th a little shorter than 6%, 6th oblong oval, palm oblique, finger rather longer than palm, serrulate. Gnathopod 2 in JS, 5tk joint much shorter than the large 6%, which has the palm more or less excavate, defined by a small but distinet tooth, within which the eurved finger impinges. Gnatho- pod 2 in 9 like gnathopod 1, but with wider 5tk and 6tk joints. Peraeo- pods 1 and 2, 24 joint narrowly oval, 4t# distally widened but not apically lobed. Peraeopod 3, 24 joint broader than long. Peraeopods 4 and 5, 24 joint oblong oval, not much expanded. Peraeopods 3—5, 6tk joint not narrowing distally, with tuft of setae at back of apex; finger up-curved. Uropods 1 and 2 spinose, in uropod 1 peduncle longer than rami. Uropod 3, peduncle twice as long as rami, with transverse row of spines on apical margin; outer ramus with 2 strong hooks, inner rather narrower with 2 lateral spines, . 1 apical, and several setae. Telson as broad as long, apex rounded, between 2 little tubercles, within which are 3 setules on either side. Colour rather variable, from red to green, with dark stellate markings, often with white spots along middle of back. It forms a dwelling by knitting together various fragments, the cement-fibres apparently supplied from the glandcells of peraeopods 1 and 2. L. reaching 20 mm. North-Atlantie with adjoining seas (Europe). Among algae between tide-marks, and at small depths. 17. A.inda (M.-E.) 1830 Amphithoe i., H. Milne Edwards in: Ann. Sei. nat., : v.20 p.376 | 1840 Amphitoe indica, H. Milne Edwards, Hist. nat. Crust., v.3 p.31 | 1888 Amphithoe i., G.M. Giles in: J. Asiat. Soc. Bengal, v.57 p.240 t. 10 £.1—7 | ?1852 A. rubella, J.D. Dana in: P. Amer. Ac., v.2 p.215 | 1853 &55 A. r., J. D. Dana in: U.S. expl. Exp., e. 1311 p. 986; t.64 f.1 a—d | 1862 A. indica + A. r., Bate, Cat. Amphip. Brit. Mus., p.240 t.42 f.3; p.246 t.42 f.8 | 1893 A. rubricata (part.)?, A. inda, A. Della Valle in: F. Fl. Neapel, v.20 p.459, 463. Body rather stout. Side-plates 1—5 broad. Pleon segment 3, postero- lateral corners subquadrate. Antennae 1 and 2 equal, or antenna 1 rather the longer. Antenna 1 more than '/, as long as body; 24 joint nearly as long as 1°, 34 very small; flagellum with 13 or 14 short joints. Antenna 2, ultimate joint of peduncle a little longer than penultimate, flagellum with 9—11 short joints. Mandibular palp small. Gnathopod 1 small, 5tk joint shorter than ‚6%, 6tk oblong, narrow, narrower at apex; finger longer than ° palm. Gnathopod 2, 6tk joint stout, broad, subrecetangular; palm transverse, little excavate and unevenly so, defining angle prominent and acute but not produced; finger moderately large and somewhat serrate. Peraeopods 1 and 2, 24 joint not much widened. Peraeopod 3, 24 joint broad. Peraeo- pods 4 and 5 much longer, with 24 joint somewhat less broad. Peraeo- Dr" cs vn u ILL u Ampithoe 641 ods 3-5, distal end of 6th joint with 2 blunt spines, including between em a rounded depression, and suited to subserve the guiding of a thread (Giles). Uropods 1—3 normal, reaching back about the same distance; inner ramus of uropod 3 with 1 spine and a few setules. Telson small, laminar, somewhat upturned, and of a roundedly conical outline (Giles), triangular (Milne Edwards). Colour purple, with patches of golden-yellow. 'L. 5—6 mm. Indian Ocean; Middle of Bay of Bengal, on drift; ?Sooloo Sea, depth 12 m. A. australiensis (Bate) 1862 Amphithoe a., Bate, Cat. Amphip. Brit. Mus., p. 287 t.41 f.7 | 1893 A. rubricata (part.), A. Dells Valle in: F. FI. Neapel, v.20 p.456. L. 12 mm. Southern Indian Ocean (South-Australia). A. brusinae (Heller) 1866 Amphithoe b., Cam. Heller in: Denk. Ak. Wien, v.2611 p-44 t.4 f.2,3 | 1893 A. rubricata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.459. L. 5 mm! Adriatie (Lissa). A. chilensis (Nie.) 1849 Amphitoe e., H. Nieolet in: Gay, Hist. Chile, v. 3 9.235 Crust. t.2 f.5a—d | 1893 Amphithoe e., A. Della Valle in: F. Fl. Neapel, 0.20 p.463. L. 16 mm. | Pacifie (Chili). A.filieornis (Dana) 1853 &55 Amphithoe f., J.D. Dana in: U.S. expl. Exp., v.13ır p.944; 1.65 f.1a—g | 1893 A. rubricata (part.), A. DellaValle in: F. Fl. Neapel, v.20 p.456. Tropical Atlantic (Rio Janeiro). A.filigera (Stimps.) 1855 Amphithoe f., Stimpson in: P. Ae. Philad., v.7 p.382 | 1893 Grubia crassieornis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20. p. 467. L. 12 mm. “ North-Paeifie (Loo Choo). A. filosa (Sav.) 1816 Cymadusa f., Savigny, Mm. An. s. Vert., v.1 p.51,109; t.4 f.la,b,e,i,o,w| 1826 Amphitho& f., Audouin in: Deser. Egypte, v.lıv p.93 Crust. t.11 f.4,?5 | 1893 Grubia crassicornis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.466. Only figured; no description. Mediterranean or Red Sea? (Egypt). A. maculata (Stimps.) 1853 Amphithoe m., Stimpson in: Smithson. Contr., v.6 nr.5 p.58 | 1893 A. rubricata (part.)? A. Della Valle in: F. Fl. Neapel, v.20 p. 489. L. 16 mm. Fundy Bay (Grand Manan). On rocky bottoms in laminarian zone and at low water, A. orientalis (Dana) 1853 & 55 Amphithoe o., J. D. Dana in: U.S. expl. Exp., ».13u p. 937; t: 64 f.2a—f (3f on plate). I: 5-6 mm. Bay of Manila [Philippine Islands]. From floating kelp. A. pausilipae (M.-E.) 1830 Amphithoe p., H. Milne Edwards in: Ann. Sei, nat., ©.20 p. 876 | 1840 Amphitoe pausilipii, H. Milne Edwards, Hist. nat. Crust., v.3 p.30 | 1851 Amphithoe graeilis, (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p.45 | 1857 A.g.+ A. pausylipi, A. pausilippüi, A. Costa in: Mem. Ace. Napoli, v.1 p.208 t.3 f.4; p. 206 | 1893 Grubia erassicorhnis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 466, 467. Bay of Naples. | Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 41 642 Ampithoe, Pleonexes A. punctata Say 1818 A. p., Say in: J. Ac. Philad., v.1ı p.383 | 1640 Am- phitoe p., H. Milne Edwards, Hist. nat. Crust., v.5 p.35 | 1893 Amphithoe? p., A. Della Valle in: F. Fl. Neapel, v.20 p. 464. Egg Harbour [United States of America.] A.ramondi (Aud.) 1826 Amphitho&r., Audouin in: Deser. Egypte, v.lıv p.98 Crust. t.11 £.6 | 1893 Grubia crassicornis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 466. Mediterranean or Red Sea? (Egypt). A.stimpsoni (Boeck) 1872 Amphithoe s., A. Boeck in: Forh. Selsk. Christian., 1871 p.48, 49 t.1 £.5 | 1893 A. rubricata (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p: 489. Resembling A. japonica (p. 638), but antenna 1, 2d joint shorter than 1st, and gnathopod 1 with 5th joint shorter than 6th. L. 13 mm. 5; : San Franeiseo. A. tongensis (Dana) 1852 Amphitoe t., J. D. Dana in: P. Amer. Ae., v2 p-216 | 1853 & 55 Amphithoe t., J. D. Dana in: U. S. expl. Exp., v. 1311 p.939; t. 64 f.83a—c | 1893 Grubia crassicornis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p.467. L. 12 mm. Tropical Pacifie (Tongatabu). Along the shores of coral islets, in shallow water, among sea-weed. A.sp., (Bate & Westw.) 1862 Amphitho& albomaculata (err., non Kroyer 1846!), Bate & Westwood, Brit. sess. Crust., v.1 p.426 £. North-Atlantic (East of the Shetland Islands). Depth 128—164 m. 2. Gen. Pleonexes Bate 1836 Anisopus (Sp. un.: A. dubius) (non Meigen 1803, Diptera!), R. Templeton in: Tr. ent. Soc, London, v.1 p.185 | 1856 Pleonexes (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.59 | 1857 P. (Sp. un.: P. gammaroides), Bate in: Ann. nat. Hist., ser. 2 v.19 p.147 | 1894 P., G. O. Sars, Crust. Norway, v.1 p. 581. Like Ampithoe (p. 631), except that in peraeopods 3—5 the 6 joint is subchelately widened at the apex (Fig. 109). Front lobes of lower lip bifid. Mandibular we palp narrow, 34 [7 Joint setose only © ADIER atapex. Peraeo- Yo ® pods 1 and 2 have NAT) Eh BERLIN the 24 jointrather SIT \ N «N N broadly oval. ) ) \\ 1 accepted spe- In cies, 3 doubt£ul. 1. P. gamma- roides Bate 1856 D ? P.g. (nom. nud.), Ga Bate in: Rep. Brit. Be Ass., Meet.25 p.59| 1857 P.g., Bate in: Ann. nat. Hist., ser.2 v.19 p.147 | 1894 P.g., G.O.Sars, Crust. Norway, v.1 p.582 t.207 | 1862 Amphithoe g., A. gammeroides, Bate, Cat. Amphip. Brit. Mus., p.235 t.41 f.4 | 1874 Sunamphitho& gammaroides, T. Stebbing in: Ann.nat. Hist., ser.4 v.14 p.114 t.11, 12 £.8,3a—f | 1866 Amphitho& bieuspis Fig. 109. P. gammaroides, Q. Lateral view. [After G. O. Sars.] Se N Ye aut a a Ze Be a a A ee ir Pleonexes 643 (err., non Kröyer 1838!), Cam. Heller in: Denk. Ak. Wien, 0.2611 p.44 t.4 f.1 | 1881 A.b., Nebeski in: Arb. Inst. Wien, v.3 p.149 t.13 f.42f | 1898 A. gammaroides + A.b., A. Della Valle in: F. Fl. Neapel, v.20 p.462 t.57 £.36; p.461 t.57 f.33—85 | 1871 Sunamphitho& hamulus (err., non Bate 1887!) + 8. longicornis, A. Boeck in: Forh. Selsk. Christian., 1870 p.245 | 1876 $8.h. + 8. 1., A. Boeck, Skand. Arkt. Amphip., v.2 p- 594 t.27 f.1; p.596 t.27 f.2. Body (Fig. 109) smooth, compressed. Head tending to bend a little downward, lateral lobes rounded. Side-plates not very deep, 1° a little produced forward, 5tk the largest. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes small, round, red. Antenna 1 variable, longer or shorter than antenna 2; 1° joint larger than 2, 34 Jess than half as long as 24; flagellum 15-jointed. Antenna 2, ultimate and penultimate joints of peduncle subequal; flagellum about 10-jointed. Lower lip with outer branch of bifid lobes produced beyond the inner (Sars: inner lobe obsolete).. Mandible, spines in spine-row 8 or 9; 34 joint of palp slightly longer and not broader than 24, Gmathopod 1, 24 joint with distal lobe, 5" not longer than broad, 6 oblong oval; palm slightly oblique, finger matching it. Gmathopod 2 in J, 5tk joint short, broad, cup-shaped, 6! large, quadrate; palm oblique, strongly sinuous diversely on 2 edges; finger serrulate, strongly Uropod 3 arched, touching defining point of palm (Sars describes Fig. 110. palm as somewhat flexuous and defined by a distinet angle). 2: gammaroides. ropod3and telson, Gnathopod 2 in oO differing from gnathopod 1 by having [after G. 0. Sars.] the 6" joint much larger, oval quadrate, palm oblique, almost straight. Peraeopods 1 and 2, 24 joint rather broadiy oval, 4tk longer than broad. Peraeopod 3, 24 joint scarcely so broad as long. Peraeo- pods 4 and 5, 24 joint long oval. 'Peraeopods 3—5, 6th joint distally expanded, fitting into eavity of upturned finger towards which spines project planted within the rounded apical lobe of the 6!% joint; one of the spines curved. Uropods 1—3, pedunele longer than rami. Uropod 3 (Fig. 110), outer ramus with 2 upturned spines; inner laminar with several setae. Telson (Fig. 110) not longer than broad, with a small subapical hook on either side of a convex apex (Sars: terminating in 2 juxtaposed, very strong, hooked projections; in figure longer than broad, with a very narrow, slightly ineised apex). Colour bright yellowish green, with scattered black dots or stellate markings. L. 6—7 mm. North-Atlantie with adjoining seas (Norway, Great Britain, France, Azores). P. dubius (R. Templ.) 1836 Anisopus d., R. Templeton in: Tr. ent. Soe. London, v.1 p.185 t.20 f.1 | 1862 Amphitho& dubia, Bate, Cat. Amphip. Brit. Mus., p. 245 t. 42 f.7 | 1893 A.d., A. Della Valle in: F. Fl. Neapel, v.20 p.464 | 1888 Sunamphithoe d., T. Stebbing in: "Bep, Voy. Challenger, v.29 p. 167. L. about 4 mm. Tropical Indian Ocean (Mauritius)? P. validus (COzern.) 1868 Sunamphithoö valida, Ozerniavski in: Syezda Russ. Est., Syezda 1 Zool. p. 101 t. 6 f. 36 | 1898 Amphithoe? v., A. Della Valle in: F. Fl. Neapel, v.20 p. 464. Perhaps identical with P. gammaroides. L. about 6 mm. Black Sea. P. virescens (Stimps.) 1853 Amphithoe v., Stimpson in: Smithson. Contr., v.6 nr. 5 p.53 | 1862 Amphitho& punctata (part.), Bate, Cat. Amphip. Brit. Mus., p. 241 | 1893 Grubia crassicornis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 467. L. 11 mm. Fundy Bay (Grand Manan). 41* 644 Grubia 3. Gen. Grubia Üzern. 1868 Grubia (Sp. un.: @. taurica), Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p. 103 | 1888 @., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 377 | 1893 @., A. Della Valle in: F. Fl. Neapel, v.20 p. 464. Like Ampithoe (p.631), except as follows. Antenna 1 has a 1-jointed accessory flagellnm, antenna 2 an elongate flagellum. Mandible, the 34 joint of the slender palp not distally expanded. Maxilla 1, the inner plate with 3 small lateral setae, Peraeopod 3 with the 24 joint longer than broad. 1 accepted speeies, } imperfeetly described. 1. G. erassicornis (A. Costa) 1857 Amphithoe ec. + 4. elongata, A. Costa in: Mem. Ace. Napoli, v.1 p.206 t.3 f.la—d; p.209 t.3 f.5 | 1893 Grubia e., A. Della Valle in: F. Fl. Neapel, ®. 20 p. 464, 918; t.2 f.12; t. 13 f£.18, 29 | 1866 Podocerus largimanus + P.longicornis, Cam. Heller in: Denk. Ak. Wien, v.2611 p.46 t.4 f.6; p.47 t.4 f.7 | 1881 Amphitho& largimana + A. longicornis, Nebeski in: Arb. Inst. Wien, v.3 p.150 t.13 f. 42c, 42b | 1868 Grubia taurica, Czerniavski in: Syezda Russ. Est., Syezda I Zool. p. 103 t.8 f. 1—10| 1888 @. t., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 377 | 1875 @. taurica var. massiliensis, Catta in: Rev. Sei. nat., v.4 p. 165. Body rather robust. Head, lateral lobes little prominent. Side-plate 1 little produced forward, 24—5!% somewhat rounded below. Pleon segment 3, postero-lateral corners subquadrate, with small point distinet from margin. above. Eyes small, rounded, red with scattered points of white. Antenna 1 as long as body; 1° and 24 joints long, equal, 34 about !/, of 24; flagellum 29—50-jointed; aeccessory flagellum searcely half as long as 1° joint of primary, but slender, distinet. Antenna 2 slender, °/, as long as antenna 1 or more; ultimate and penultimate joints of peduncle equal; flagellum with 23—30 joints, sometimes as long as peduncle. Mandible, 34 joint of palp set with pectinate spines, but not densely. Maxilla I, 24 joint of palp with 8 small spines round apex and part of inner margin; outer plate with 10 apical spines. Gnathopod 1, 5th joint nearly as long as 6, distally squared, 6% oval, palm only defined by a palmar spine, which is crossed by tip of faintly serrate finger. Gnathopod 2 in d, 5tk joint short, cup-shaped, 6 oblong oval, the palm strongly sinuous, scarcely (to strongly) defined from the straight hind margin; the finger overlapping the palmar margin and elosing on to the surface of the joint. Gnathopod 2 in © similar to gnatho- pod 1, but with. shorter 5t" and enlarged 6tk joint. Peraeopods 1 and 2, 24 joint narrowly oval, and others as in Ampithoe rubricata (p: 639). Peraeo- pods 3—5, 24 joint narrowing distally, suecessively longer and narrower, 4th _6th joints rather long and narrow. Pleopods with 2 coupling spines. Uropods 1—3 nearly as in Ampithoe rubricata. Uropod 3, outer ramus the shorter, hinder reverted spine the shorter; the oval mner ramus beset with slender spines and 1 rather stout one. Telson nearly as broad as long; sides converging to the 2 reverted points; apex projecting a little between these, obtuse angled. Colour yellowish green with red spots. L. 6—12 mm. Mediterranean, Black Sea. G. setosa (Hasw.) 1879 Amphitho& s., Haswell in: P. Linn. Soe. N.S.Wales, v.& p.270 | 1885: Amphithoe s., Chilton in: P. Linn. Soe: N.S.Wales, vu. 9 p. 1040 | 1893 A. rubricata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 456. Antenna 1 with a very short accessory flagellum. - South-Paeifie (Botany Bay, rock-pools; Sydney Harbour). De er Tag u ee u Br ge Amphithoides, Sunamphitoe 645 4. Gen. Amphithoides Kossm. 1880 Amphithoides (Sp. un.: A. longicornis), Kossmann, Reise Roth. Meer., v. 21 "Malaeost. p.135 | 1888 A., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 516, 517. Like Ampithoe (p. 631), except that antenna 1 has an accessory flagellum, uropod 3 has only 1 well developed hook on the outer ramus, and the telson is flat, unarmed. l species accepted, 1 doubtful. 1. A. longicornis Kossm. 1880 A. I., Kossmann, Reise Roth. Meer, v. 21 Malacost. p. 135 | 1893 Grubia cerassicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.464. O. S$ide-plates as in Ampithoe (p. 631). Antenna 1 as long as body; 22 joint rather longer than 1%, 34 much shorter; flagellum 23-jointed; accessory flagellum 2-jointed, shorter than 1° joint of primary. Antenna 2, 24 and 34 joints of pedunele [? ultimate and penultimate] very long; flagellum 17-jointed. Gnathopods 1 and 2 almost exactly alike in shape and size, but 5tk joint rather longer and more slender in gnathopod 1, and the palm defined by a palmar spine only in gnathopod 2; 6 joint in both widening to the convex palm, finger faintly serrate. Marsupial plates broad. Uropod 3, 24 hook of outer ramus indicated by a scarcely visible blunt tuberele. L. 4 mm. Red Sea. A. comptus (S.1.Sm.) 1873 Amphithoö compta, (S. 1. Smith in:) A. E. Verrill in: Rep: U. S. Fish Comm., v.1 p.564 | 1893 A.?c., A. Della Valle in: F. Fl. Neapel, v.20 p.463. Mouth-parts, uropod 3, and telson undeseribed. L. reaching 13 mm. North-Atlantic (from North Carolina to Cape Cod, among eel-grass; Vineyard Sound, 'at surface). 5. Gen. Sunamphitoe Bate 1856 Sunamphitoe (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p. 59 | 1857 S., Bate in: Ann. nat. Hist., ser.2 v.19 p.147 | 1888 S$., T. Stebbing in; Rep; Voy. Challenger, v.29 p. 1722| 1857 Synamphithoe, A. White, Hist. Brit. Crust., p. 201 | 1862 Sunamphithoe, Bate (& Westwood), Brit. sess. Crust., v.1 p.429 | 1894 $., G. O. Sars, Crust. Norway, v.1 p. 584. Like Ampithoe (p. 631), but deeisively distinguished by absence of mandibular palp; in the bifid front lobes of lower lip the outer lobe less prominent; gnathopod 2 in S much larger than gnathopod 2 ing and differently shaped; hooks of telson small. l species. 1. 8. pelagica (M.-E.) 1830 Amphithoe p., H. Milne Edwards in: Ann. Sei. nat., v.20 p.378 | 1840 Amphitoe p., H. Milne Edwards, Hist. nat. Crust., v.3 p.36 | 1856 Sun- amphitoö hamulus (nom. nud.) + $8. conformatus (nom. nud.), Bate in: Rep. Brit. Ass., Meet. 25 p.59 | 1857 S.h. (2°) + 8. conformata (8), Bate in: Ann. nat. Hist., ser. 2 v.19 p.147 | 1857 Synamphithoe h.—+ S.c., A. White, Hist. Brit. Crust., p.202 | 1862 Sunamphithoö h. + S. c., Bate & Westwood, Brit. sess. Crust., v.1 p.480 f.; p.482 f. |. 1862 S.h.+3S.c., Bate, Cat. Amphip. Brit. Mus., p. 250 t.43 f£.5; p. 251 t.43£.6| 1874 8. c., T. Stebbing in: Ann. nat. Hist., ser. 4 v.14 p.116 t. 12 f.4,4a—d | 1894 S.c., G.O. Sars, Crust. Norway, v.1 p.585 t.208 | ?1861 Amphitho& grandimana, A. Boeck in: Forh. Skand. Naturf., Mode 8 p.668 | 1876 A.g., A. Boeck, Skand. Arkt. Amphip., 0.2 p.591 1.26 f.4 | 1893 Amphithoe hamulus + Grubia erassicornis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.463 t.57 f.28, 29; p. 464. 646 Sunamphitoe, Biancolina Side-plates 1—4 with setules at lower hind corner; side-plate 1 scarcely produced forward, 5tt the largest. Body smooth, compressed. Head, lateral lobes broadly rounded. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes small, rounded, red. Antenna 1 longer than antenna 2; 1st joint the largest, 39 small; flagellum elongate, in S reaching more than 40 joints. Antenna 2, ultimate joint of peduncle shorter than penultimate, flagellum shorter than peduncle, in J reaching 17 setose joints. Mandible just as in Ampithoe rubricata (p. 639), except for absence of palp. Gnathopod 1, 24 joint apically a little widened, 5tk distally widened, 6! rather longer than 5th, oblong; palm transverse, short; finger projeeting beyond palm, faintly serrate. Gnathopod 2 in JS, 5tk joint cup-shaped, short, its hind lobe narrow, 6! large, oblong oval, a setose lobe or tuberele projecting near hinge of finger, and from this the mieroscopieally dentieulate palm joining or forming the hind margin without defining point; the long, slightly sinuous finger about ®/, as -long as 6! joint. Gmathopod 2 in © like gnathopod 1, but with 5tk joint shorter, and 6" rather broader. Peraeo- pods 1 and 2, 24 joint broadly oval, 4 about as broad as long; finger blunt at tip. Peraeopod 3, 24 joint broader than long, 4" and 5th shorter than 6th, Peraeopods 4 and 5, 24 joint oblong oval, narrowing a little distally, 4 —6th joints moderately long. In peraeopods 3—5 the finger is curved, its inner margin marked as if for serration, of the apical spines on the 6" joint one follows the curve of the finger (Bate in 1857 describes these limbs as scarcely prehensile in S. Aamulus). Pleopods 1—3 with 3 coupling spines. Uro- pods 1 and 2, rami not very long. Uropod 3, outer ramus mieroscopically denticulate on upper margin, of the upturned spines the apical the smaller, inner ramus with several setules and 2 spinules. Telson broader than long, with a little tuberele or upturned point on either side of triangular apex. Colour greenish yellow with stellate markings. L. 8—17 mm. North-Atlantie, North-Sea and English Channel (Norway; France; North and South Devon, between tide-marks; Azores). 6. Gen. Biancolina Della Valle 1893 Biancolina (Sp. un.: B. algicola), A. Della Valle in: F. Fl. Neapel, v. 20 p. 562. Antenna 1 longer than antenna 2, without accessory flagellum, flagellum longer than pedunele. Upper lip rounded as in Ampithoe (p. 631). Lower lip, outer lobes indented on outer not on inner margin, inner lobes distinct to the base, little divergent apically. Mandible short, cutting edge with about 10 unequal teeth; accessory plate with 4 or 5 teeth, smaller on right than on left mandible, spine-row of 3 or 4 minute spines; molar evanescent; palp wholly wanting. Maxilla 1 powerful, inner plate small, with 1 seta, outer long, with 9 spines so 'erowded as to make the counting rather uncertain. Maxilla 2, both plates slender, feebly armed, outer a little the longer and broader. Maxillipeds, inner plates rather long and narrow on elongate base, outer reaching beyond 24 joint of palp, armed with few but strong spine-teeth; palp’s joints 1—3 short, stout; finger small, conical, with well formed nail. Gnathopod 1 forming a small imperfect chela. Gnathopod 2 massive, subchelate. Peraeopods I—5, 24 joint somewhat expanded, finger curved. Peraeopod 3, 6t% joint reverted. Uropod 3, peduncle stout, rami short, lamellar, outer with 2 hooks. Telson small. ‘1 species. NEE m Biancolina, Jassidae 647 1. B. cuniculus (Stebb.) 1874 Amphithoe c., T. Stebbing in: Ann. nat. Hist., ser.4 v.14 p.112 t. 11 f.1,1a—e | 1898 A. c.+ Biancolina algicola (9 juv.), A. Della Valle in: F. Fl. Neapel, v.20 p.460 t.57 f.38; p.562 t.3 f.11, t.32 f.38—53 | 1899 B. c., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.350. Integument brittle. Head with bulging cheeks, rabbit-like in profile, attachment of antennae prominent. Side-plates not deep, but shaped as in Ampithoe (p. 631). Pleon segment 3, postero-lateral corners rounded. Eyes small, round, red. Antenna 1, 1° joint a little longer than 24, which is twice as long as 34; flagellum sometimes twice as long as peduncle, with 18 unequal joints, some with sensory filaments. Antenna 2, ultimate joint of peduncle rather shorter than penultimate, flagellum shorter than peduncle, 5-jointed. Gmathopod 1, 24 joint expanded distally, 34 and 4th equal, 5th widening a little distally, scarcely longer than 6%, which has a small slightly produced palm, much overlapped by the small and stout but acute finger. Gnathopod 2 massive (at least in JS); 24 joint expanded, 5tk short, cup- like, 6! very large, broad and long; palm excavate, defined by a tooth; finger large, arcuate, obliquely truncate, leaving cavity between its apex and its minute nail. Peraeopods 1 and 2, 24 joint expanded, oval, 4tk short and wide, 6!" longer than 5tt, Peraeopod 3 short, 24 joint rounded, expanded proximally, 3&—5th short. Peraeopods 4 and 5 rather long, 24 joint somewhat expanded, narrowed distally, 4" and 5!" moderately long, 6!" longer. Uropodl, peduncle long, setose, with an oval process at apex, the slightly unequal rami rather shorter than peduncle. Uropod 2 shorter; some setae on peduncle, which is as long as the rami. Uropod 3, peduncle short, much longer than the small broad rami, inner with 4 slight spinules. Colour bright yellow. L. 45 mm. ‘ Bay of Naples, depth 1—2 m; Torbay, within tide-marks. | 37. Fam. Jassidae 1899 Ischyroceridae, T. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 211. Head, lateral lobes often somewhat prominent. Side-plates variable in relative proportions, 4% with hind margin usually not excavate (Fig. 111 p-650). Antennael and 2 variable in relative proportions; accessory flagellum of antenna 1 distinet or indistinet, but never large. Upper lip with pointed epistome. Lower lip and mouth-parts in general as in Aoridae (p.585), except that the 34 joint of mandibular palp is shorter than 24, laminar, and that the maxillipedsin Wyvillea (p. 648) have inner and outer platesrudimentary and palp 3-jointed. Gnathopods 1 and 2 subchelate, 24 the larger, often greatly modified in d. Peraeopods 1 and 2 glandular. Peraeopod 3 reverted. Peraeopod 5 the longest. Uropods 1—3 biramous. Uropod 3, rami very short, the outer uncinate and usually surmounted by denticles. Telson simple. Marine. 5 genera, 21 accepted species and 5 doubtful. Synopsis of genera: 1 | Maxillipeds, palp 3-jointed . . .. 2.2... 1. Gen. Wyvillea . . . p.648 Maxillipeds, palp 4-jointed — 2. 9 [ Antenna 1, accessory flagellum indistinet . . 2. Gen. Parajassa . . .:p.649 Antenna 1, accessory flagellum distinet — 8. 648 Jassidae, Wyvillea Side-plate 5 not much deeper than side-plate 6. 3, Gen. Mierojassa. . . p.65l » | Side-plate 5 much deeper than side-plate 6 — 4. Gnathopod 2 in d, hind margin of 6th joint produced into a tooth; gnathopod 2 in Q er Br: much larger than gnathopod 1... . . 4. Gen. Jassa .... . p: 652 Gnathopod 2 in d, hind margin of 6th joint not produced into a tooth; gnathopod 2 in ® not much larger than gnathopod 1 . . 5. Gen. Ischyrocerus . p. 657 4 1. Gen. Wyvillea Hasw. 1879 Wyvillea (Sp. un.: W. longimanus), Haswell in: P. Linn. Soe. N.S. Wales, 0.4 p.336 | 1888 W., T. Stebbing in: Rep. Voy. Challenger, v.29 p.518 | 1880 Macleayia, Haswell in: Ann. nat. Hist., ser.5 v.5 p. 32. Side-plates scarcely so deep as their segments. Antenna 1 shorter than antenna 2, with accessory flagellum. Mandible with palp. Maxillipeds exunguiculate, inner and outer plates rudimentary; palp 3-jointed. Gnathopod 2 verylarge. Uropod 3 apparently as in Jassa (p. 652). Telson entire or emarginate. 2 species. Synopsis of species: Teiase wirh ask De Si, 5 ee 1. W.longimana . . p.648 Telson with apex emarginate . . -. 2.22 .% .. 2. W.haswelli . . . p.648 1. W.longimana Hasw. 1879 W. longimanus, Haswell in: P. Linn. Soc. N.S. Wales, v. 4 p.387 t.22 f.7 | 1884 Podocerus l., Chilton in: 'Ir. N. Zealand Inst., v. 16 p.255 1.17 f.2 ae | 1879 P. eylindricus (err., non Say 1818?), T. W. Kirk in: Tr. N. Zealand Inst., v.11 p. 402. Eyes round. Antenna 1 searcely ’/, as long as body; gu joint bnich as long as 1°, a little longer than 3%; flagellum as long as 2 joint of peduncele, 7-jointed; accessory flagellum nearly !/, as long as primary, 2-jointed. Antenna 2 about half as long as body, stout, subpediform; peduncle as long as antenna 1; flagellum as long as ultimate joint of peduncle, armed distally with eurved spines. Gnathopod 1 small, 5tk joint about half as long as 6%, 6th ovoid, distally narrowed; palm very oblique, defined only by 2 palmar spines; finger serrate (Chilton). Gnathopod 2 in C very large; 5th joint small, triangular, 6% eylindrical, eurved, margins parallel, 4 times as long as broad, with a blunt tooth at each end of the eoncave, rather hirsute margin, which should be considered as the palm; proximal tooth not deeurrent. Gnathopod 2 in @ (Chilton) not larger than gnathopod 1, and similar thereto, but with 5% joint shorter, and 6! rather more narrowed distally; finger in both gnathopods roughened rather than serrate. Peraeopods 1—5 all short and broad, 1° and 24 shorter than the rest. Uropod 3, peduncle long, narrowing slightly distally; rami very short, inner stiliform, outer ending in 3—6 upturned teeth (Chilton). Telson eonieal, blunt. Colour pale re with many black dots and markings (Chilton). L. 3—14 mm. South-Paeifie (Port Jackson [East-Australia]; Worser Bay and Lyttelton Harbour [New Zealand)). 2. W. haswelli (G. M. Thoms.) 1897 Maera h., G. M. Thomson in: Ann. nat. Hist., ser.6 0.20 p.449 t.10-£.6—10 | 1899 Wyvillea h., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3°p.350. Body slender and compressed. Head long, without rostrum; lateral lobes small, acutely produced. Eyes produced well forward on lateral lobes Wyvillea, Parajassa 643 of head; lenses numerous. Antenna 1, 1° joint thicker but rather shorter than 24 or 34, 34 a little shorter than 24; flagellum slender, broken; accessory flagellum 4-jointed, about as long as 34 joint of pedunele. Antenna 2 ‚broken. Mandible normal; palp with very short 1st joint, 39 rather shorter than 24, broad ended, with setae on apex. Gnathopod 1 small, 5tk joint distally a little expanded, 6'k rather shorter, oval, palm oblique, ill-defined, finger a little over half as long as 6! joint. Gmathopod 2 very large, 4th joint small, triangular, hind margin produced acutely, 5t% joint very short, similarly produced very acutely, 6% very long, narrow at base, widening gradually to a transverse, slightly dentieulate palm, defined by a small tooth; the straight hind margin having also a small tooth or projection at its base; the great finger projeets far over the palm, its falcate end elosing between the acute ends of the 4 and 5tk joints. Peraeopod 4 rather slender. Uropods 1 and 2 reaching nearly as far as uropod 3. Telson (in figure) broader than long, rounded, with an excavation little more than "/, the. length, between 2 rounded apices, each with a spinule. L. 4 mm. South-Paeifie (New-Zealand). Depth 15 m. 2. Gen. Parajassa Stebb. 1813/14 Jassa (part.), Leach in: Edinb. Ene., ©.7 p.483 | 1859 J., R.M. Bruzelius in: Svenska Ak. Handl., n. ser. v.8 nr. 1 p.18 | 1871 Janassa (Sp. un.: J. variegata) (non G. Münster 1839, Pisces!), A. Boeck in: Forh. Selsk. Christian., 1870 p.249 | 1876 J., A. Boeck, Skand. Arkt. Amphip., v.2 p.608 | 1894 J., G.O. Sars, Crust. Norway, v.1 p.598 | 1895 J., A. O. Walker in: Ann, nat. Hist., ser. 6 v.15 p.472 | 1899 Para- jassa, T. Stebbing in: Ann. nat. Hist., ser. 7 e.3 p. 240. Like Jassa (p. 652), except that the accessory flagellum of antenna 1 is nearly obsolete, none of the side-plates are particularly deep, and the 5 side-plate is almost as deep as the 4fh, 2 species. Synopsis of species: Antennae 1 and 2 conspieuously unequal .... . 1. P. pelagica .... . p- 649 Antennge 1 and 2 subequal ...... 222... 2. P. tristanensis . . . p.650 1..P. pelagica (Leach) 1813/14 Jassa p., Leach in: Edinb. Ene., v.7 p.433 | 1899 Parajassa p., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.240 | 1843 Podocerus eapillatus, H. Rathke in: N. Acta Ac. Leop., 2.201 p.89 t.4 f.8 | 1859 Jassa capillata, R.M. Bruzelius in: Svenska Ak. Handl., n. ser. ©.3 nr. 1 p.19 | 1894 Janassa c., G.O. Sars, Crust. Norway, v.1 p.599 t.214 | 1895 J.e., A. O. Walker in: P. Liverp. biol, Soc., ©,9 p- 316 | 1871 J. variegata (err., non Podocerus variegatus Leach 1813/14]), A. Boeck in; Forh. Selsk. Christian., 1870 p.250 | 1876 J.», A. Boeck, Skand. Arkt. Amphip. „ v.2 p.608 1.28 f.1; 1.29 f.2 and? 3 | 1893 Podocerus falcatus (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p- 445. Body (Fig. 111 p. 650) rather tumid, especially in ©. Head rather small, front lobes narrowly rounded. 1° and 34 side-plates produced below the 24, Pleon segment 3, postero-lateral corners rounded. Eyes small, rounded, dark. Antennae 1 and 2 in C und 0 densely setose with setae separate and in fascicles. Antenna 1 more than !/, as long as body; 34 joint longer than 1°, as long as 24, rather longer than flagellum, of which 1° joint is very large, 24 and 34 minute; accessory flagellum a mere tuberele. Antenna 2 longer and much stronger; ultimate joint of peduncle slightly longer than 650 Parajassa penultimate, as long as flagellum, which is similar to that of antenna 1, but larger. Gnathopod 1, 5t& joint triangular, 6tk oval, widest in the middle where the hind margin joins the straight oblique palm, defined by an obtuse angle and palmar spines. Gnathopod 2 nearly alike in d and Oo; 6th joint broad, in 9 the internal ed (23 198 ba ee Pays teh (Leach), a 7 EN the ae ae IM . . ie ers Min SMS within the well 7 R N > marked defining ? ZR va 2” AS angle, while in | /f Si UN the 5 this angle > IÄN is produced into AN an almost thumb- He: Pe like tooth, over- Lateral view. [After G. O. Sars.] lapped by the strong finger. Peraeopods 1 and 2 short and stout, 24 joint a little widened. Peraeo- pods 3—5 slightly encreasing successively in length; 24 joint oblong oval; in peraeopod 5 the lower hind corner slightly produced. Uropod 3 reaching rather beyond the others, outer ramus uncinate, without marginal serrations, inner with a lateral spinule. Telson about as long as broad, with small projection and adjacent setule at each side of the apical triangle. Colour grey or dark, with transverse bars of brown. L. 9 7, 0 9 mm. Arctie Ocean and North-Atlantie (Norway up to Finmark, Shetland Islands); Kattegat; German Sea; Liverpool Bay. 2. P. tristanensis (Stebb.) 1888 Podocerus t., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1141 t.121 | 1893 Ischyrocerus t., A. Della Valle in: F. Fl. Neapel, v.20 p.450 1.57 f.20 | 1899 Parajassa t., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 240. Body not robust. Head, lateral lobes not very prominent, with acute point. . Side-plates 1—5 about equal in depth. Pleon segment 3, postero- lateral corners obtuse. Eyes rounded oval, dark in spirit. Antennae 1 and 2 subequal, slender, with long setae, not. densely grouped, some plumose. Antenna 1, 34 joint much longer than 1°, subequal to 24, shorter than flagellum, of which the 1° joint is about half as long as the other 3 combined; accessory flagellum seemingly absent. Antenna 2, ultimate joint of peduncle as long as penultimate, both together rather longer than the 4-jointed flagellum. Gmathopod 1, 24 joint not longer than 5t%, which is nearly or quite as long as the rather narrowly oblong oval 6%; palm ill-defined, shorter than the hind margin; finger overlapping palm, finely pectinate, with a denticle near the acute apex. Gnathopod 2 in J, 24 joint short, with greatly expanded distal lobe, 5t" short, broadiy cup-shaped, 6th large, not twice as long as broad; palm with broad tooth near finger-hinge, then shallowly excavate, parallel to front margin, and subequal.to hind ‘margin, which ends in a short tooth, against which the apex of the stout, much curved, smooth finger impinges. Gnathopod 2 in © differing from gnathopod 1 by the short, eup- shaped 5th joint, the 6! somewhat larger with a better defined palm, and the pectinate finger armed with a longer dentiele. Peraeopods 1 and 2 rather short and compact, the 24 and 4! joints a little expanded. Peraeo- pod 5 rather long; 24 joint oblong, not much expanded, shorter than the 6th, u de oc 2 "EB = rl rt 5" ar ee A ei a m Fi BEE a” ,* ru = Parajassa, Microjassa 651 Pleopods, rami with 5 joints. Uropod 3, peduncle broad, not twice as long as rami; outer ramus the shorter, with 2 minute spines at its slightly bent tip; inner ramus with a rather larger apical spine. Telson as broad as long, rounded triangular, with a small projeetion and adjacent setule at each side of the apical triangle.. L. about 3 mm. South-Atlantie (Tristan da Cunha). Depth 201 m. 3. Gen. Microjassa Stebb. 1899 Microjassa (Sp. un.: Podocerus cumbrensis), T. Stebbing in: Ann, nat. Hist., ser.7 v.3 p.240. Like Jassa (p. 652), except in regard to side-plates, antenna 2 and maxillipeds. Side-plates 2—4 much deeper than the rest, 4th large, emarginate behind for the small 5tt, Antenna 2 but little stronger than antenna 1. Maxillipeds, outer plates scantily armed. As in Ischyrocerus (p. 657) gnathopods 1 and 2 of oO little unequal, but gnathopod 2 of much larger than gnathopod 1, and differing in shape as well as size from gnathopod 2 of oO. 1 species. 1. M. cumbrensis (Stebb. & D. Roberts.) 1891 Podocerus c., T. Stebbing & D. Robertson in: Tr. zool. Soc. London, v.131 p.38 t.68 | 1895 P.c., A. O. Walker in: P. Liverp. biol. Soe., v.9 p.316 | 1899 P. c., Microjassa, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.240 | 1893 P. falcatus (part.), P. anguipes (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 445, 944. Head, rostrum small, blunt; lateral lobes obtusely pointed. Side-plate 1 very small, almost concealed by the much larger and deeper 24; 34 and 4th as deep as 24 and much broader; 4th of equal breadth and depth, with shallow emargination behind; 5th—7th small, shallow. Pleon segment 3, postero-lateral angles bluntly produced. Eyes round. Antenna 1, 1% joint short and stout, 24 long, a little longer than 34; flagellum "/, as long as peduncle, with 3 slender joints; accessory flagellum 1-jointed, about '/, as long as 1° joint of primary. Antenna 2 stouter and a little longer than antenna 1, otherwise very similar; ultimate and penultimate joints of peduncle subequal in length; flagellum as long as ultimate joint of peduncle, with 3 slender joints. Mandible, eutting plate quadridentate, accessory plate similar on left, serrate on right, molar with small dentieulate plate in front; 24 and 34 joints of palp broad, 39 the shorter. Maxillipeds, outer plates with 3 spine-teeth on inner and 4 on distal margin, 4tk joint of palp short, blunt, tipped with long spines. Gmnathopod 1, 24 joint a little bent, 5t% cup-shaped, scarcely longer than 4h, 6tk oval, about twice as long as 5th; palm ‚defined by 3 palmar spines, slightly overlapped by apex of finger. Gnathopod 2 in GC, 24 joint channelled in front, shorter than 6th; 5th joint short, coalesced with 6tb; 6th joint very large, oblong, attaining a length 2"/, times the width; hind margin produced into a long tooth, forming a deep cavity between itself and the straight palmar margin, which is produced to a smaller tooth near the finger-hinge; over the 2 cavities arches an immensely long, eurved, sinuous finger, with a small prominence on inner margin. Gnatho- pod 2 in © is like gnathopod 1, but a little larger. Peraeopods 1 and 2, 24 joint long’ oval, 4! rather broad, widening distally, 5t" broader but much shorter than 6t%, Peraeopod 3, 24 joint longer than broad, widest proximally. Peraeopod 4 like the 34, but 24 joint with hind margin more strongly serrate. ER re RR 652 Mierojassa, Jassa Peraeopod 5 longer, 29 joint widest at the middle. Branchial vesicles very small. Marsupial plates rather large. Pleopods 1—3 with 2 coupling spines, inner ramus with 5—7 joints, outer with 6—8. Uropod 1, pedunele longer than rami. Uropod 2, pedunele longer than outer, shorter than inner ramus. Uropod 3, pedunele stout, longer than peduncle of uropod 2; outer ramus having on distal half about 9 minute denticles, encreasing towards apex; inner ramus rather longer, straight, tipped with spine. Telson triangular, as broad as long, with a setule on either side of rounded apex. Colour brown. L. 3 mm. Firth of Clyde, depth 38 mm; Irish Sea (North Wales). 4. Gen. Jassa Leach 1813/14 Jassa (part.), Leach in: Edinb. Ene,, v.7 p.433 | 1899 J., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.239 | 1852 Cratophium, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.309 | 1853 C., J. D. Dana in; U. 8. expl. Exp., v.13u p. 832, 840. Body more slender in G than m ©. Head with small rostral point and lateral lobes somewhat produced. Side-plate 2 broader than deep in C}; 34 and 4th in both sexes deeper than 24 or 5tk; 4th not perceptibly emarginate behind. Antennae 1 and 2 setose, peduncle long, flagellum much shorter. Antenna 1, 1° joint shorter than 24 or 34; accessory flagellum very small. Antenna 2 usually considerably longer and stouter than antenna 1, especially in S. Upper lip rounded, epistome (so far as known) with pointed process. - Lower lip normal. Mandible normal, palp very large, 34 joint shorter than 24, distally widened, strongly setose. Maxilla 1, inner plate very small with inconspieuous marginal setae, outer plate with 9 apical spines; 24 joint of palp long, with apical spine-teeth. Maxilla 2, inner plate the shorter, with lateral fringe. Maxillipeds normal, compact. Gnathopod 2 in both sexes much larger than gnathopod 1, stronger in J than in 9; the hind margin of 6! joint in J produeed into a strong tooth. Peraeopods 1 and 2, 24 joint slightly expanded. Peraeopods 3—5 suecessively longer, with moderately expanded 24 joint. Uropods 1 and 2, outer ramus shorter than inner. Uropod 3, pedunele stout, much longer than the rami, outer of which ends in a hook or hooked spine and usually has little teeth on the upper margin, inner ramus straight. Telson triangular. 7 species accepted, 4 obscure. Synopsis of accepted speeies: on inner margin — 2. Gnathopod 2 in S, finger without prominent tooth | Gnathopod 2 in d, finger with prominent tooth on inner margin — 3. ned Iopih re 1. J.dentex . . . . p.653 Gnathopod 2 in d, 6th joint with basal thin- | Gnathopod 2 in d, 6th joint with subbasal thick- endad toelh an 2. J. faleatiformis . p.653 process near the base — 4. Gnathopod 2 in S, 6th joint with thumb-like process | Gnathopod 2 in d, 6th joint with thumb-like remote from base — 6. er 2 Ba u a Er N Se Be we ,-, 7. ee Be» Jassa 653 Antenna 2, ultimate joint of pedunele much longer : an vente 2... anne. 3. J.ingens . . - . p.658 - * | Antenna 2, ultimate joint of peduncle not much longer than penultimate — 5. ME el ee; 4. J. pulchella . . . p.654 Gnathopod 2 in d, thumb-like process with simple i Gnathopod 2 in J, thumb-like process with N PR 5. J. pusilla . . . . p.655 6 Peraeopod 4 in ä with joints 4—6 narrow.. . . 6. J.ocius . . „» -» » p.655 .\ Peraeopod 4 in S with joints 4—6 broad . . . 7. J. frequens . . . p.656 1. J. dentex (Czern.) 1868 Podocerus d., Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.100 t.6 f.35 | 1880 P.d., Sowinski in: M&m. Soc. Kiew, v.6 p. 110 t.4f.8 | 1899 Jassa d., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.350 | 1898 Podocerus herdmani, A. ©. Walker in: P. Liverp. biol. Soe., v.7 p.37 f.13 | 1895 P.h., P. fal- catus var.?, A.O. Walker in: Ann. nat. Hist., ser. 6 v.15 p.473 | 1895 P.h., P. f. var.?, A. ©. Walker in: P. Liverp. biol. Soe., v.9 p.314 | 1893 P. ocius (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.448 | 1898 P.o., Sowinski in: M&m. Soc. Kiew., v.15 p. 460 | 1894 P. odontonys, G. O. Sars, Crust. Norway, v.1 p.597 t. 213 f. 2. oO. In general like J. pusilla (p. 655). — ©. Head, lateral lobes rather broad, atapex minutely emarginate. Side-plate 1 rather produced forward, 24 twice as broad as deep. Eyes rather large, rounded, brownish or black. Antenna 1 about half as long as body; 24 joint as long as 34, nearly twice as long as 1°; flagellum 3—5-jointed, accessory flagellum extremely minute. Antenna 2 a little longer, more robust; flagellum 3- or 4-jointed. Gnathopod 1 nearly as in J. pulchella (p. 654) and J. pusilla. Gnathopod 2, 6 joint oblong oval, with a stout tooth close up to the finger-hinge, and another prolonged from the hind margin, with a rather deep eavity between; both teeth sometimes bifid; finger strong and curved, with a variable tooth at middle of inner margin. Peraeopods, uropods and telson seemingly like those in J.pusilla. Colour, variegated with dark brown. L. 3—5 mm. Arctic Ocean, North-Atlantie and Irish Sea (Trondhjemsfjord and Hammerfest; Colwyn Bay; Liverpool Bay); Black Sea. Depth 1-—-282 m. 2. J. falcatiformis (Sowinski) 1898 Podocerus f. + Ischyrocerus constantino- politanus (juv.), Sowinski in: M&m. Soc. Kiew., %.15 p.461 t.8 f.9—16; p.463 t.8 f. 17— 25. Adult © unknown. — d. Antenna 1, 24 joint more than twice as long as Ist, a little longer than 34, a little shorter than the 3-jointed flagellum. Gnathopod 2, 6! joint long and rather slender, narrowing to the finger- hinge, front margin very convex, a slender tooth, fully half the length of the joint, rising from the base behind, alongside the straight palm, which ‘is interrupted a little beyond the basal tooth by a Small projecting tooth, apposed to a similar tooth on the inner margin of the finger; finger as long as the 6th joint, with 5 setules om its distal concavity. Uropod 3, peduncle long and thieck, outer ramus uneinate, distally crenulate with 9 small close-set blunt teeth. L. 4 mm. Bosphorus. Depth 32--36 m. 3. J. ingens (Pfeff.) 1888 Podocerus i., Pfeffer in: Jahrb. Hamburg. Anst., v.5p.131t.3£.1 | 1898 P. faleatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p:445. Head, lateral lobes bluntly triangular. Side-plate 1 produced a little forward, 24 broader than deep, 34 and 4th sueeessively deeper; front lobe De a 654 Jassa of 5th nearly as deep as 4tk, Pleon segment 3, postero-lateral corners obtuse. Eyes longitudinally oval. Antenna 1, 1° joint ®/, as long as 24, 34 as long as 24; flagellum a little longer than 34 joint of peduncle, with 7 joints, 15t much the longest. Antenna 2 much longer, about °/, as long as body; ultimate joint of peduncle very long, 1'/, timesaslong as penultimate, not setose; flagellum shorter than ultimate joint of peduncle, 6-jointed. Gnathopod 1, 6th joint piriform, the narrow part apical; finger finely serrate. Gnathopod 2 in S very large and powerful; the 6! joint long, slightly curved, with tooth of moderate length springing from near the base and having in a notch on the outer side a tuft of spines or setae; a triangular tooth is near the finger- hinge, and against this a prominence of the long finger works, while its apex closes down on to the outer notch of the other tooth. Gnathopod 2 in Q differs from J in that the proximal tooth is represented by a rounded, truncate prominence of the hind or palmar margin. Peraeopods 1 and 2 comparatively short and weak; 4 joint distally widened. Peraeopods 3—5 successively longer, 24 joint well expanded, its hind margin in peraeopod 3 weakly concave, in 4®% straight, in 5th weakly convex. Telson small, rounded triangular, rather broader than long, with 1 spine on each side of the apex. Colour grey and whitish, variegated with brown. L. 12—26 mm. South-Atlantie (South Georgia). At lowest ebb of spring-tides. 4. J. pulchella Leach 1813/14 J.p., Leach in: Edinb. Ene., v.7 p.433 | 1899 J. 2., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.239 | 1830 Podocerus pulchellus, H. Milne Edwards in: Ann. Sei. nat., v.20 p.384 | 1843 P. calcaratus, H. Rathke in: N. Acta Ac. Leop., 0.201 p.91 t.4 f£.9 | 1851 Ischyrocerus (P.) e., I. anguipes (err., non I.5angvipes Kröyer 1838!), W. Liljeborg in: Ofv. Ak. Förh., v.8 p.28 | 1853 & 55 Crato- phium validum, J. D. Dana in: U. S. expl. Exp., v.1311 p.841; t.56 f.2 | 1886 Podocerus validus, G.M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p.143 | 1857 P. falcatus (err., non Cancer (Gammarus) f. Montagu 1808!), Bate in: Ann. nat. Hist., ser.2 v.19 p.148 | 1876 P. f. (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.603 t.27 f.4,7 | 1879 P.f., Hoek in: Tijdschr. Nederl. dierk. Ver., v.4 p.120 t.8 £.13—15; t.9 f.1—3 | 1881 P.f., Nebeski in: Arb. Inst. Wien, v.3 p.151 t.18 f.44 | 1887 P. f., J. Bonnier in: Bull. sei. Nord, v.18 p.840 | 1893 P. f. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 445 t.14 f.1—10; t.57 f.13—16 | 1894 P. f., G. O. Sars, Crust. Norway, v.1 p. 594 t.212 | 1895 P. f., A. O. Walker in: Ann. nat. Hist., ser. 6 v.15 p.472 | 1862 P. pul- chellus + P. validus + P. f. + P. pelagieus (err., non Jassa pelagica Leach 1813/14!), Bate, Cat. Amphip. Brit. Mus., p.253 t.48 f.8; p.258 t.48 f.9; p.255 t.44 f.1; p.255 t.44 f.2| 1879 P. australis, Haswell in: P. Linn. Soc. N.S. Wales, v.4 p.338 t.21 f.8 | 1888 P. falcatus + P. validus, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.1132 t.119; p- 1135 t. 138». Body more slender and compressed in J than in O0. Head, lateral lobes small, rounded, prominent. Side-plate 1 somewhat angularly produced forward, 24 in J broader than deep, 34 and 4 in C considerably deeper than 24 or 5tk, Pleon segment 3, postero-lateral corners quadrate, with minute projecting point. Eyes small, rounded, dark. Antenna 1 not half as long as body, 34 joint considerably longer than 1°t, shorter than 29 or flagellum; flagellum 5—-9-jointed. Antenna 2 much longer and stouter, especially in S; ultimate joint of peduncle usually longer than penultimate; flagellum with 3—6 joints, 1° much the longest; flagellum and at least ultimate joint of peduncle often carrying fascieles of plumose setae. Gnatho- pod 1, 6! joint oval or somewhat piriform; palm straight, oblique, defined slightly by an obtuse angle and palmar spines. Gnathopod 2 in SO, 5tk joint masked by 4th, eup-shaped, very small, obscurely separated from 6th, sth very large, narrow, nearly straight, palm nearly parallel to front margin, Be Eu a EEE SER N a EEE A u a ee ae Te SE Fan Fee 2 = ; i Jassa 655- with distal tooth near finger-hinge; the short hind margin ending in fully adult S in a long tooth (in younger d a dentiele nearer the distal than the proximal end of the joint), ornamented on the outer side with tufts of _ setae, its apex overlapped by that of the long slightly sinuous finger; inner margin of finger sometimes on proximal half minutely tubereulate. Gnatho- pod 2 in © much larger than gnathopod 1, irregular oval, or long piriform, hind margin very short, the long palm having a distal tooth near the finger- hinge, thence passing with a long excavation to 2 prominences, of which the 24 is beset with 3 palmar spines, among which the apex of the long serrate finger impinges. Peraeopods 1 and 2 rather short and stout, 24 joint a little expanded, 4 distally widened. Peraeopods 3—5 successively longer, 24 joint oval. Uropod 3, outer ramus unecinate, with 2 teeth on upper distal margin. Telson very small, triangular, with 2 setae on each side of the acute apex. Colour, brown or red patches, of various shapes and sizes. L. 5—10 mm. Atlantic with adjoining seas (Europe from Trondhjemsfjord to Naples; Azores; Rio Janeiro); Southern Indian Ocean (Kerguelen Island); Pacifie (Philippines; Port Jackson [East-Australia]; lat. 43° S., long 82° W.). 5. J. pusilla (O.Sars) 1876 Podocerus falcatus (part.), A. Boeck, Skand. Arkt. Amphip., v.2 p.605 t.28 f.2 | 1893 P. f. (part.), A. Della Valle in: F. Fl. Neapel, v. 20: p-445 | 1895 P. f.var.?, A.O. Walker in: Ann. nat. Hist., ser.6 v.15 p.473 | 1882 P. mi- nutus (non Ischyrocerus m. W. Lilljeborg 1855!), G. O. Sars in: Forh. Selsk. Christian., nr. 18 p.112 t.6 £.6,6a | 1894 P. pusillus, G. O. Sars, Crust. Norway, v.1 p. 596 t. 212 £.1. In general like J. pulchella, but shorter and stouter. Head, lateral lobes rather broad and angular in front. Side-plate 1 in J rather sharply produced, 5! nearly as deep as 4!h, Pleon segment 3, postero-lateral corners simply quadrate. Eyes rather large, rounded, dark brown. An- tenna 1, 34 joint about twice as long as 1°, as long as 24, rather shorter than the 5-jointed flagellum. Antenna 2 rather longer, more robust, but not very stout; flagellum slender, 4-jointed, faseicles of setae not plumose. Gmathopod 2 in adult JS differing from that of J. pulchella in that the basal tooth of 6% joint is much shorter and broader and has a distinetly bifid apex. Gnathopod 2 in Q, 6 joint more regularly oval, palm less strongly sinuous, defined by a very slight angle, the 2 prominences much smaller and less widely separated than in J. pulchella. Peraeopods 1—5 more slender, less densely setiferous. Uropod 3, outer ramus less coarsely hooked. Telson small, acutely produced at apex. Colour, variegated with jrregular patches of brown. L. about 5 mm. Aretie Ocean, North-Atlantie, North-Sea, Irish Sea and Skagerrak (South- and West-Norway, depth 37—188 m, on hydroids; British Isles; France). 6. J. ocius (Bate) 1862 Podocerus o., Bate (& Westwood), Brit. sess. Crust., v.1 p.450 f. | 1862 P.o., Bate, Cat. Amphip. Brit. Mus., p. 257 t.44 f.5 | 1866 P. o., Cam. Heller in: Denk. Ak. Wien, v.26nm p.45 | 1868 P. o., Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.99 | 1881 P.o., Nebeski in: Arb. Inst. Wien, v.3 p. 152—154 t.13 f.43 | 1893 P. o. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.448 t.14 f.11—27 | 1895 P.o., A. O. Walker in: Ann. nat. Hist., ser.6 v.15 p.473 | 1895 P.o., A. O. Walker in: P. Liverp. biol. Soe., v.9 p.316. i In general like J. pulchella, but distinguished by the gnathopod 2 in d and ©, and uropod 3. Antennae 1 and 2 rather slender. Antenna 1, 656 Jassa flagellum with 4 joints, 1° the longest, thrice as long as the little 1-jointed accessory flagellum. Antenna 2, flagellum with 3 joints, 1° about twice as long as 24 and 34 combined, 24 more than twice as long as 3%. Gmnathopod 1, 6% joint piriform or oval, palm not defined except by the palmar spines; finger slightly dentieulate near the nail. Gnathopod 2 in 5, 6% joint widening distally, hind margin long, ending in a considerable tooth, the slightly oblique palm having another rather smaller tooth adjaeent to this, and after a cavity a broader tooth near the finger-hinge. Gnathopod 2 in © smaller than m Cd. but very similar, only that the tooth of the hind margin is less advanced than the adjacent tooth of the palm. Peraeopods 3—5 rather more slender than in J. pulchella. Uropod 3, outer ramus with unecinate apex but without teeth on upper edge. Telson with a seta on each side of acute apex. Colour pale yellow. L. 3—5 mm. —- Bristol Channel (North Devon); Irish Sea (Isle of Man); Mediterranean; Black Sea. 7. J. frequens (Chilton) 1883 Podocerus f., Chilton in: Tr. N. Zealand Inst., w.15 p.85 t.3 f.2 | 1884 P. latipes (3), Chilton in: Tr. N. Zealand Inst., v.16 p. 258 1.19 f.2a—d | 1893 P. frequens, P.1., A. DellaValle in: F. Fl. Neapel, v.20 p.447, 448. Eyes moderately large, round. Antennae 1 and 2 equal, setose, slender. Antenna 1, 34 joint longer than 1%, as long as 24, shorter than flagellum; flagellum 8-jointed, accessory flagellum 2- or 3-jointed. Antenna 2, ultimate Joint of pedunele as long as penultimate, shorter than the 8-jointed flagellum; spines at apex of flagellum little eurved. Gnathopod 1, 5tk joint longer than 6th, 6th narrowly oval; proximal half of finger serrate. Gnathopod 2 in S, 5tk joint short, eup-shaped, 6t" stout, oblong, the hind margin ending in a3 square slightly emarginate process, a little overlapped by the broad proximally serrate finger; the not very oblique palm having a deep indent adjacent to process of hind margin. Gnathopod 2 in Q and probably young © having 6» joint without the square process, but the palm a little concave. Peraeopods 1--5 rather stout, especially peraeopod 4, which in the adult 9 has all the joints expanded, the 24—5th as broad as long. Uropod: 3, pedunele stout, narrowing at apex, rami small, slender, nearly naked. 'Telson with 2 curved spines, and anterior to these 1 or 2 simple setae. L- about 3 mm. Lyttelton Harbour [New Zealand]. J. californies (Boeck) 1872 Podocerus californicus, A. Boeck in: Forh. Selsk. Christian... 1871 p:41 t.1 f.6 | 1893 P. faleatus (part.), A: Della Valle in: F. Fl. Neapel, v.20 p. 445. L. 7 mm. Nörth-Pacifie (California). J. falcata (Mont.) 1808 Cancer (Gammarus) falcatus, Montagu in: Tr. Linn. Soe. London, «9 p. 100 t.5 £.2 | 1812 Astacus f., Pennant, Brit. Zool., ed.5 v.4 p.34 | ‘1813/14 Cancer (Gammarus) f., Jassa (part.)?, Leach in: Edinb. Ene., v.7 p.483 | 1899 J.f., A.O. Walker in: Ann. nat. Hist., ser. 7 0.8 p.895 | 1829-43 J. pelagica (err., non Leach 1813/14!), Guerin-Meneville, Iconogr. Regne an., #2 Crust. t.27 f.3; «3 Crust. p. 28: Possibly identical with J. dentex (p. 653). The elongate curved finger of gnatho- pod 2 has (in figure) a prominent tooth on the inner margin not far from the finger-hinge. English Channel (South Devon). Jassa, Ischyrocerus 657 J. orientalis (Dana) 1852 Gammarus o., J. D. Dana in: P, Amer. Ac., v.2 p. 212 | 1853 & 55 Oratophium orientale, J. D. Dana in: U. 8. expl. Exp., v, 1311 p. 843; t. 56 f. 3a—b | 1862 Podocerus orientalis, Bate, Cat. Amphip. Brit. Mus., p.258 1.44 f.6 | 1893 P. falcatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.445. Gnathopod 2, 6th joint subovate, "palm nearly longitudinal, tridentate. L. 6 mm. Eastern entrance of the Strait of Sunda, J. ornata (Miers) 1875 Podocerus ornatus, Miers in: Ann, nat, Hist., ser. 4 v.16 p.75 | 1879 P. o., Miers in: Phil. Tr., v.168 p.210 t.11 £.6 | 1893 P.?o., A, Della Valle in: F. Fl. Nerpel, v.20 p. 454. L. 13 mm. Swain’s Bay [Kerguelen Island]. 5. Gen. Ischyrocerus Kröyer 1838 Ischyrocerus (Sp. un.: I. angvipes), Kröyer in: Danske Selsk. Afh., v.7 p: 283, 287 | 1894 I, G.O. Sars, Crust. Norway, v.1 p. 587. Like Jassa (p. 652), except as follows. Side-plate 2 in d not differently shaped from side-plate 3. Gnathopod 2 in the o little larger than gnatho- pod 1. Gnathopod 2 in the S with hind margin of the 6% joint not produced into a prominent decurrent tooth. 9 species accepted, 1 obscure. Synopsis of accepted species: Eyes present — 2. h Eyes wanting — 7. Uropod 3, rami more than half as long as peduncle 1. Lnanoides . . p.657 Uropod 3, rami less than half as long as pedunele -— 3, wm Gnathopod 2 in , 6th joint more than twice as long TE EB re RE 2. L anguipes . . p. 658 Gnathopod 2 in d, 6th joint not more than twice as long as broad — 4. 4 Peraeopods 3—5 rather slender — 5. Peraeopods 3—5 rather robust — 6. Pleon segment 3, postero-lateral eorners square . . 3. L megacheir . p.659 Pleon segment 3, postero-lateral eorners round . . 4. L assimilis . . p.659 Bros Ewa ee en 5. Llatipes .-. . p. 660 a Eyes unusually large . . . ... 222 20. . . 6. Lmegalops.. . p. 660 Antenna 1, 1st joint as long as the head . . . . . 7. L tenuicornis . p. 660 ? | Antenna 1, 1st joint not as long as the head — 8. nearly as long as 1st Joint of DERBAN .: . 5. 8. IL. brevicornis . p. 661 Antennae 1 and 2 long, slender; accessory flagellum Antennae 1 and 2 short, robust; accessory flagellum ® | not nearly as long as 1st joint of primary . . . 9. L tuberculatus p. 661 1. I. nanoides (H. J. Hansen) 1887 Podocerus n., H. J. Hansen in: Vid. Meddel., ser.4 v.9 p.162 t.6 f. 4—4b | 1893 Protomedeia maculata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 436. Q. Body elongate, narrow. Head, lateral lobes acute, little produced. Side-plates rather small, in figure front lobe of 5th nearly as deep as 4th, Pleon segment 3, postero-lateral corners broadly rounded. Eyes rather small, reddish. Antennae 1 and 2 long, slender, with long setae. Antenna 1, 24 Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 42 658 Ischyrocerus joint very little longer than 34, flagellum 1?/, times as long as 34 joint of peduncle, 7- or 8-jointed; accessory flagellum as long as 1° joint of primary, 1-jointed. Antenna 2 longer, ?/, as long as body; flagellum about 6-jointed. Gnathopods 1 and 2 nearly alike; 6" joint not large, oblong, palm very oblique, evenly convex, the defining angle not very conspicuous, marked by 2 palmar spines. Peraeopod 4 much longer than peraeopod 3 and peraeo- pod 5 than peraeopod 4; all rather slender. Uropod 3, pedunele rather long, longer than pedunele of uropod 2, stout, with long rami, more than half as long as peduncle. L. 4—5 mm. — G unknown. Baffın Bay (lat. 71° N., long. 59° W.). 2. I. anguipes Kröyer 1838 I. angvipes, Kröyer in: Danske Selsk. Afh., 0.7 p. 283 t.3 f. 14a-—-m | 1840 I.anguipes, H. Milne Edwards, Hist. nat: Crust., v.3. p. 56 | 1859 Podocerus a., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr. 1 p.21 | 1874 P. a., Buchholz in: Zweite D. Nordpolarf., v.2 p.378 Crust. t.13 f.2; t.14 | 1876 P. a, A. Boeck, Skand. Arkt. Amphip., v.2 p. 603 t.27 f.5,6 | 1893 P.a., A. Della Valle in: F. Fl: Neapel, v.20 p. 444 t.57 f.18 | 1894 P.a., T. Stebbing in: Bijdr. Dierk., v.17 p. 44 | ?1845 Gammarus zebra, H. Rathke in: N. Acta Ace. Leop., v. 201 p.74 1.3 f.4| 1851 Ischyrocerus z., W. Liljeborg in: Öfv. Ak. Förh., v.8 p.23 | 1855 Podocerus z., W.Liljeborg in: Vetensk. Ak. Handl., 1853 p.446 | ?1853 Cerapus fucicola, Stimpson in: Smithson. Contr., v.6 nr.5p.48 t.3 f.34 | 1855 Ischyrocerus minutus, W. Liljeborg in: Öfv. Ak. Förh., v.12 p.128 | 1862 Podocerus eylindricus (err., non Say 1818!), Bate, Cat. Amphip. Brit. Mus., p. 256 t. 44 f.4 | 1884 P. falcatus (err., non Cancer (Gammarus) f. Montagu 1808!), H. Blane in: N. Acta Ac. Leop., 0.47 p.79 t.9 f.96—101 | ?1889 P. isopus, A. OÖ. Walker in: P. Liverp. biol. Soe., v.3 p.209 t.11 £. 11—13 | ?1890 P.i., A.O. Walker in: P. Liverp. biol. Soe., v.4 p.250 t. 16 £.7 | ?1894 P. megacheir, T. Stebbing in: Bijdr. Dierk., v.17 p.44 | 1894 Ischyrocerus anguwipes, I. angvipes + I. minutus, G. OÖ. Sars, Crust. Norway, v.1 p.588 t.209; p.589 t.210 f.1 | 1895 I. anguipes + I. m., Ohlin in: Acta Univ. Lund., v.31 nr.6 p.56. Body rather slender. Head, lateral lobes somewhat obtuse but with a minutely projecting point. Side-plates encreasing in depth from 18t—4th in ©, but in S 24—4th equal in depth; 5t" with front lobe rather less deep than 4%. Pleon segment 3, postero-lateral corners rather obtusely quadrate. Eyes small, rounded, dark brown. Antenna 1 about '/, as long as body; 34 joint of peduncle much longer than 1°, little shorter than 24; flagellum about half as long as peduncle, attaining 9 joints, but often with fewer; accessory flagellum shorter than 1° joint of primary, with 2 joints, 24 minute. Antenna 2 longer, especially in JO; flagellum about as long as ultimate joint of peduncle, 5—7-jointed. Gnathopod 1 rather feeble, 6!" joint oval, distally narrow; the oblique palm defined by palmar spines, finger serrate. Gmathopod 2 in SO very large; 5tk joint very small, cup-shaped, 6tk elongate, curved; the concave, hirsute hind margin or palm parallel to the convex front, and forming near the finger-hinge a truncate, finely denticulate process; the finger bulging a little after passing this process; palm margin occasionally straight or even a little convex. Gnathopod 2 in Q similar to gnathopod 1, but more robust. Peraeopods 1—5 rather strongly built. Peraeopods 3—5, 24 joint oblong oval, hind margin smooth or crenulated; finger miero- scopieally pectinate for some distance. Uropod 3, pedunele long, rami short, outer tapering, tipped with small spines, inner (not outer) rather broader, apically bent, having on upper margin 3 or 4 denticles. Telson little longer than broad, obtusely triangular, with dorsal transverse row of 1—4 slender spines on each side. Colour very variable. L. 4—15 mm. Arctic Ocean (widely distributed); North- Atlantic, North-Sea and Skagerrak (Norway and Bohuslän; Grand Manan; Liverpool Bay?); Kattegat; West Baltie, depth 18 m. u nun nl a al Ischyrocerus 659 3. I.megacheir (Boeck) 1871 Podocerus m., A. Boeck in: Forh. Selsk. Christian., 1870 p.247 | 1876 P.m., A. Boeck, Skand. Arkt. Amphip., v.2 p.602 t.29 f.4 | 1893 ‚Podoceropsis m. (part.), A. Della Valle i in: F. Fl. Neapel, v.20 p.453 | 1894 Ischyrocerus M., 6. O. Sars, Crust. Norway, v.1 p.592 t.211 | ?1895 I. m., A. M. Norman in: Ann. nat. Hist., ser. 6 v.15 p.492. Body rather long and slender. Head, lateral lobes acute. Side-plates not very deep, 1° quadrate in front, 4!" scarcely larger than 34, 5tk nearly as deep as 4, Pleon segment 3, postero-lateral corners quadrate. Eyes rather large, rounded oval, light brown. Antennae 1 and 2 about °/, as long as body, with long setae, antenna 2 rather the longer. Antenna 1, 1s joint shorter than head, ga elongate, as long as 24 or a little longer; flagellum longer than 32 joint of pedunele, with 9—10 joints in S and 4—8 in O; accessory flagellum as long as 1° joint of primary, with minute 24 joint. Antenna 2, ultimate joint of pedunele longer than _ penultimate, shorter than flagellum, which has 8—11 joints. Gnathopod 1, 6 joint oval, with palm ill-defined, larger in CS than in Q. Gnathopod 2 in d, 6! joint large and tumid, about thrice (or less) as long as broad; palm slightly flexuous and a little cerenulate, defined by an obtuse angle with small palmar spines; finger strong, apex impinging within border of palm. Gnathopod 2 in oO similar to gnathopod 1, but with shorter 5!" and more oblong and stouter 6! joint. Peraeopods us slender; 24 joint in peraeopods 3—5 oblong oval, narrowing downward. Uropod 3, pedunele elongate, outer ramus but slightly hooked at the tip, with 1 denticle on upper edge. Telson as long as broad, with 2 setae on each side of sub- acute apex. Colour whitish, pellueid, with light transverse orange bands L. 7”—12 mm. Arctie Ocean and North-Atlantie (Norway, Iceland, Bear Island, Spitzbergen). Depth 100—1444 m. 4. I.assimilis (O.Sars) 1879 Podocerus a., G.O.Sars in: Arch. Naturv. Kristian., v.& p.450 | 1885 P.a., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 205 t.17 f. 1a—e | 1893 Podoceropsis megacheir (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.453. Body rather elongate. Head, lateral lobes acutely produced. Side- plates of moderate depth, 1° rounded in front, 5tk notably not so deep as 4{h, Pleon segment 3, postero-lateral corners obtusely rounded. Eyes rather small, longitudinally oval, dark brown. Antennae 1 and 2 powerful, subequal, more than half as long as body. Antenna 1, 1° joint as long as head, 24 and 34 much longer, equal; flagellum longer than 34 joint of pedunele, 9-jointed; accessory flagellum 1-jointed, very small, scarcely more than "/, as long as 1° joint of primary. Antenna 2, ultimate joint of peduncle rather longer than penultimate, both elongate, flagellum as long as ultimate, 8-jointed. Bussaeped 1, 6% joint oval, palm quite undefined, unless by extent of finger. Gmnathopod 2, especially in d ‚ powerful, 6! joint very large and tumid, as-long as 4 preceding joints together, oblong oval; the long nearly straight hind or palmar margin fringed with partly plumose setae; finger strong, faleiform, closing upon inner surface of hand. Peraeopods 3—5, 24 joint oblong; peraeopod 4 much longer than 34, 5th than 4. Uropod 3, peduncle rather elongate, rami remarkably small. Telson short, but thick, tubular. Colour whitish, with brown spots or shadings. L. reaching 8 mm. North-Atlantie and Arctic Ocean (west of Helgeland, er 850 m; south of Bear Island, depth 66 m). 42% 660 Ischyrocerus 5. I, latipes Kroyer 1842 I.1., Kroyer in: Naturh. Tidsskr., v.4 p.162 | 1893 I.1., A. Della Valle in: F. Fl. Neapel, 0,20 p.450 t.57 £.19 | 1894 T. I, @. O. Sars, Crust. Norway, v.1l p.591 | 1862 Podocerus l., Bate, Cat. Amphip. Brit. Mus., p. 257 | 1876 P.l., A. Boeck, Skand. Arkt. Amphip., v.2 p.600 t.29 f.1 | 1887 P.l.,, H.J. Hansen in: Vid. Meddel., ser. 4 v.9 p.161 t.6 £.3—3b. Body elongate, depressed, back broad. Head, lateral lobes rounded. Side-plates 3 and 4 much larger than 24, 5th much less deep than the 4th, Pleon segment 3, postero-lateral corners quadrate. Eyes obliquely oval, not large. Antenna 1 more than half as long as body, setose, 1° joint about as long as head, 24 much longer, 34 as long as 24; flagellum scarcely longer than 34 joint of peduncle, 9-jointed; accessory flagellum 1-jointed, about half as long as 1% joint of primary. Antenna 2 longer, ultimate joint of pedunele little longer than penultimate, flagellum little longer than ultimate, 7-jointed. Maxillipeds, palp (Boeck) elongate, the 34 joint (in figure) more than twice as long as broad. Gnathopod 1, 5tb joint distally widened and setose, 6th oval, nearly triangular, '/, longer than broad, palm convex; finger long, curved, serrate. Gnathopod 2 in d much larger, 5tk joint very short, eup-shaped, 6!" not twice as long as broad, oval, plump; hind and palmar margin evenly convex, fringed with setae; finger long and curved. Gnathopod 2 in 9 (Hansen), 6! joint very short and broad, palm oblique, long, with an emargination, defining angle rounded. Peraeopods 3—5, 24 joint broad, in peraeoped 3 longer than broad. Uropod 3, pedunele very long, rami very short, the outer (Boeck) having 2 blunt teeth on the end, inner without teeth. Telson longer than broad, oval, apically pointed, with a spine on each side of the apex. L. 14—15 mm. Arctic Ocean (Greenland). Depth 15—188 m. 6. I.megalops O.Sars 1894 I. m., G.O.Sars, Crust. Norway, v.1 p. 591 t.210 f.2. . ©. Body not very slender but somewhat compressed. Head, lateral lobes angular. Side-plates rather large, 5!t much less deep than 4 Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes unusually large, rounded oval, dark. Antennae 1 and 2 rather strongly built. Antenna 1 about half as-long as body; 1° joint shorter than head, 24 and 34 not very long, but each longer than 1%; flagellum longer than 39 joint of peduncle, 8-jointed; accessory flagellum extremely minute, not nearly half as long as 1° joint of primary. Antenna 2 scarcely longer than antenna 1; ultimate joint of peduncle a little longer than penultimate, flagellum sub- equal to penultimate, 6-jointed. Gmathopods 1 and 2 rather stout and similar, but gnathopod 2 much the larger; 6'% joint broad, oval; palm oblique, simple, defined by a slightly marked angle, with several palmar spines. Peraeo- pods 1—5 rather stout; 24 joint in peraeopod 3 very broad proximally. Uropod 3 nearly as: in I. anguipes (p. 658). Telson triangular, with a few simple dorsal setae, apex obtusely pointed. Colour whitish, with indistinet brownish bands. L. 7 mm. Aretie Ocean (Hammerfest [Norway]). On hydroids; depth about 75 m. 7. I. tenuicornis (0. Sars) 1879 Podocerus longicornis (err., non Cam. Heller 18661), G.O. Sars in: Arch. Naturv. Kristian., v.4 p.461 | 1885 P. tenuicornis, G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 209 t. 17 f.3 | 1893 Podoceropsis sophiae (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 452. Body rather compressed. Head, lateral corners greatly produced, acute, Side-plates well developed, front lobe of 5tk notably less deep than 4, Ischyrocerus 661 Pleon segment 3, postero-lateral eorners acute. Eyes wanting. Antennae 1 and 2 nearly as long as body, with long setae. Antenna 1, 1° joint longer than head, 24 much longer than 1%, 34 nearly as long as 24; flagellum with 5 elongate joints; accessory flagellum 1-jointed, half as long as 1° joint of primary. Antenna 2, ultimate joint of pedunele long, slightly shorter than penultimate; flagellum as in antenna 1. Gnathopods 1 and 2 rather feeble, 6! joint oval, without spines, merely furnished with delicate bristles; 24 gnathopod not much larger than 1°. Peraeopods 3—5 almost equal in length; 24 joint oblong oval. Uropods 1—3 slender. Colour uniform white. L.3 mm. Arctic Ocean (north-west of Finmark). Cold area; depth 2090 m. 8 L brevicornis (O. Sars) 1879 Podocerus b., G. OÖ. Sars in: Arch. Naturv. Kristian, v.4 p.460 | 1882 P. b., Hoek in: Niederl. Arch. Zool., suppl. 1 nr. 7 p.63 | 1885 P. b., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p. 207 t.17 f. 2a —c | 1893 Podoceropsis sophiae (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 452. Body rather stout. Head, lateral lobes acute. Side-plates pretty well developed, 5t% notably less deep than 4. Pleon segment 3, postero-lateral - corners quadrate. Eyes wanting. Antennae 1 and 2 short, robust, not half as long as body, with short setae. Antenna 1, 1° joint shorter than head, 34 longer than 1°, shorter than 24; flagellum 7- or 8-jointed; accessory flagellum 1-jointed, nearly as long as 1° joint of primary. Antenna 2, flagellum shorter than ultimate joint of peduncle, 6- or 7-jointed. Gmnatho- pods 1 and 2 robust, similar, but 24, especially in J, considerably larger; 6!h joint broad, compressed, the oblique palm well defined from the. hind margin, with powerful palmar spines in gnathopod 1, and a distinet angular projection in gnathopod 2. , Peraeopods 3—5, 24 joint rather broad, especially in peraeopod 5. Uropods 1—3 not very elongate, in particular uropod 3. Colour whitish. L. 6—9 mm. North-Atlantie and Arctie Ocean (Storeggen Bank and in open sea; lat. 63° N., long. 5° E.; round Bear Island and Spitzbergen, depth 275—1444 m; lat. 74° N., long. 45° E., depth 801 m). 9. L.tuberculatus (Hoek) 1882 Podocerus t., Hoek in: Niederl. Arch. Zool., suppl. I nr. 7 p.64 t.3 f.32 | 1893 P.t., A. Della Valle in: F. Fl. Neapel, v.20 p. 443 t.57 £.17|1894 P. t., T. Stebbing in: Bijdr. Dierk., v.17 p.44 | 1888 P. hoeki, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1136 t. 120. Head, lateral lobes obtuse with minute point in front. Side-plate 4 the largest. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes wanting. Antenna 1, 34 joint a little longer than 1°, decidedly shorter than 24; flagellum 6-jointed, longer than 34 joint of peduncle; accessory flagellum half or less than half as long as 1° joint of primary, 1-jointed. Antenna 2 longer, ultimate joint of peduncle slightly longer than penultimate or than the 5-jointed flagellum. Gmnathopod 1, 5t% joint eup- shaped, 6!" broad, proximally oblong, but narrowing distally; the palm longer than hind margin, very oblique, straight, finely serrate, defined by palmar spines, among which the curved serrate finger closes. Gnathopod 2 in 9 like gnathopod 1, but with the 6% joint larger, and in the S of the same general character, but with 5tk joint comparatively smaller, 6!" large, more oblong, with the palm obliquely sinuous, irregularly tuberculate, defined by a small tooth, within which the broad, somewhat denticulate finger closes. Peraeopods 1 and 2 rather stout. Peraeopods 3—5, 2% joint oblong, in peraeopod 4 narrowing distally. Uropod 3 rather short, peduncle about 2'/, times as long as rami, Naala a ee En a Tr ER a Ta “= re a 662 Ischyrocerus, Corophiidae of which one is apieally bent, but apparently without any row of denticles on the upper edge. Telson rounded triangular. L. 5 mm. Barents Sea (lat. 71°—77° N., long. 50° E., depth 126—320 m); South-Paeifie (lat. 40° S., long. 178° E., depth 2071 m). I. monodon (Heller) 1866 Podocerus m., Cam. Heller in: Denk. Ak. Wien, v.2611 p.45 1.4 f.4,5| 1893 P. falcatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 445. Finger of gnathopod 2 not dentieulate. L. 5 mm. Adriatie (Lesina). 38. Fam. Corophiidae 1849 Corophidae, J.D. Dana in: Amer. J. Sei., ser.2 «.8 p.139 | 1876 C., A.Boeck, Skand. Arkt. Amphip., v.2 p.619 | 1888 Corophiidae, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1154 | 1894 C., G. O. Sars, Crust. Norway, v.1 p. 606 | 1893 Corofidi (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 351. Body usually more or less depressed. Pleon small. Side-plates usually small and often not in continuity. Antennae 1 and-2 of variable pro- portions, with or without accessory flagellum. Mouth-parts generally normal, except that mandibular palp is not always 3-jointed, and the inner plate of maxilla 1 is sometimes evanescent. Gnathopods 1 and 2 variable in character and relative proportions. Peraeopods 1 and 2 usually glandular. Peraeopod 5 the longest. Pleopods often with peduncle internally expanded. Uropod 1 biramous. Uropod 2 biramous or uniramous. Uropod 3 small, weakly biramous, uniramous, or even without rami. Telson simple (Fig. 115, 118 p. 686, 691), sometimes lobate. Marine, but extending into brackish or even almost fresh water, 11 genera, 44 accepted species and 11 doubtful. Synopsis of genera: Uropod 3 without ramus .... 2... 1. Gen. Concholestes . p. 663 Uropod 3 (Fig. 115, 118) not without ramus — 2. R [ Mandibular palp 3-jointed -— 8. 10) Mandibular palp not 3-jointed — 10. Uropod 3, inner ramus distinet — 4. Uropod 8, inner ramus wanting or not arti- eulated — 5. J Side plates in continuity . ». 2..... 2. Gen. Paracorophium p. 663 \ Side plates not in continuity . -» .. 2... 3. Gen. Camacho . . . p.664 3 j Uropod 2 uniramous — 6. \ Uropod 2 biramous — 7. | Gnathopod 2 (Fig. 112) in Z, and not gnatho- 5 6 pod 1, complexly subehelate ...... 4. Gen. Cerapus . . . p.665 | Gnathopod 1 in $, and not gnathopod 2, eom- plexly subehelate -... un... 2%... % 5. Gen. Chevreuxius . p.669 j Antenna 1 without accessory flagellum — 8. ; ntenna 1 with accessory flagellum — 9. \ Ant 1 with y flagell j Gnathöpod 2 in & complexly subehelate . . 6. Gen. Eriethonius . . p. 670 \ Gnathopod 2 in & simply subchelate or chelate 7. Gen. Cerapopsis . . p.674 g | Antennae very elongate . . . . ...... .. 8.Gen. Neohela . . . p.675 \ Antennae not very elongate . ... 2... 9. Gen. Uneiola . . . p.676 Corophiidae, Concholestes, Paracorophium 663 10 Mandibular palp 1-jointed . . .: 2...» 10. Gen. Siphonoecetes p.681 Mandibular palp 2-jointed ..».. 2.2... 11. Gen. Corophium . . p.685 1. Gen. Concholestes Giles 1888 Concholestes (Sp. un.: C. dentaliü), G.M.Giles in: J. Asiat. Soc. Bengal, 0.57 p.237 | 1890 C©., G. M. Giles in: .J. Asiat. Soc. Bengal, v.59 p. 63 | 1893 C., Siphon- oecetes (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.895, 924. Mouth-parts imperfectly known; otherwise agreeing with Siphonoecetes (p. 681), except that uropod 2 is uniramous, and that uropod 3 has no ramus. 1 species. 3 1. C. dentalii Giles 1888 C.d., G.M.Giles in: J. Asiat. Soc. Bengal, v. 57 p.238 t.7 £.7—11 | 1893 €. d., Siphonoecetes (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 895, 924 | 1890 €. dentallii, G. M. Giles in: J. Asiat. Soc. Bengal, v.59 p. 63. Body slender, head and peraeon thrice as long as pleon; peraeon segment 1 dorsally produced in a small setose lobe over base of head. Head almost truncate in front, but with 2 little median points. Side-plates as in Siphon- oecetes (p.681). Eyes very small, on front angles of head. Antenna 1 stout, less than half as long as body, setose, flagellum as long as 24 joint of peduncle, 5-jointed. Antenna 2 very stout, nearly as long as peraeon, setose; ultimate and penultimate joints of peduncle subequal; flagellum short and stout, 2-jointed, ending in 2 curved spines. Mandible of simple form and palpate, maxillipeds small and unguieulate. Gnathopod 1 feebly subchelate; 5" joint slightly longer and broader than 6%, which is described as without palm, the grasping power Iying between the stiffish hairs of its hind margin and the serrate finger. Gnathopod 2 little longer but much stouter; 5! joint short, broad, cup-shaped, 6!" swollen at the base, hind margin very short, palm oblique, strongly armed with 3 formidable teeth; finger stout, strongly serrate, while a powerful secondary tooth projects obliquely on either side, nearly as strong as the central tooth, and giving the finger a trifid appearance. Peraeopods 1 and 2 short, 24 joint expanded, finger long and straight. Peraeo- pods 3 and 4, 24 joint narrow, 5th stout, cylindriec, armed at apex with 1 short stout spine, the rounded apex being also densely clothed with short reeurved hooks; ‘the retroverted 6% joint attached to front margin of 5th; finger forming a small but strong hook. Peraeopod 5 longer, normal, 24 joint not much expanded, distally tapering. Marsupial plates narrow, fringed with long setae. Pleopods 1—3 small, peduncle much broader than long. Uropod 1, peduncle stout, armed with a few stout spines, rami half as long as peduncle, stout, spinose. Uropod 2 shorter, peduncle very short, broad; ramus rounded, with apical recurved hooks. Uropod 3 short, blunt, apically spiniferous. L. about 8 mm. Bay of Bengal (off the Seven Pagodas, near Madras). Depth 13 m, on a sandy bottom.‘ Makes its home in the shell of Dentalium lacteum, lining it with cemented sandy particles. 2. Gen. Paracorophium Stebb. 1899 Paracorophium (Sp. un.: Corophium excavatum), T. Stebbing in: Ann. nat. Hist., ser. 7 0.3 p.350. - Body eompressed. Head with produced lateral lobes. Side-plates continuous, 1° not produced forward. Eyes small, on lateral lobes of head. Antenna 1 slender, without accessory flagellum; flagellum with several’ joints. 664 Paracorophium, Camacho Antenna 2 robust; flagellum slight, of more than 3 joints. Mandible with 3-jointed palp. Gnathopod 1 as in Corophium (p. 685). Gmathopod 2 nearly as in Corophium, but the long process of 4! joint fringed on its front or inner margin, while the 5" is fringed on its hind margin, the 2 joints there- fore, though fitting together, having no look of coalescence; 6t% joint with small palm. Peraeopod 3 the shortest, setose; 6!" joint with strong spines. Peraeopods 4 and 5 successively much longer. Peraeopods 3—5, 24 joint widely expanded. Uropod 1, and still more uropod 2, stout, with strong spines, biramous. Uropod 3 small, outer ramus nearly as long as peduncle, “ inner oval, minute. Telson entire, short. l species. 1. P. excavatum (G. M. Thoms.) 1884 Corophium e., G. M. Thomson in: Tr. N. Zealand Inst., v.16 p.236 t.12 f. 1-8 | 1899 C. e., Paracorophium, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 241, 350. Pleon segments 4 and 5 are dorsally coalesced (in figure). Head with small rostral point, lateral lobes narrowly rounded. Eyes small, round, on lateral lobes. Antennae 1 and 2 subequal, more than '/;, as long as body. Antenna 1, 1% and 24 joints long, 1% much the longer (figure), 34 very short; flagellum as long as peduncle, 10-jointed. Antenna 2, joints of peduncle short and thick; flagellum short, 6-jointed. Mandibular palp longer than trunk, 1° joint rather long. Gmnathopod 1 rather small, 3% joint short, with tuft of long setae, 4" very short, 5th long, fringed with long setae on hind margin, 6% rather shorter, slightiy widened distally; palm transverse, finger scarcely overlapping it. Gnathopod 2 rather longer, slender; 4" joint produced into a scoop-like process, fringed on each margin with long setae, and into which the carpus [5 joint] is fitted elosely when the limb is folded; 5t% joint slightly widened distally, densely fringed along hind margin, 6!" subequal to 5th, margins nearly parallel, hind produced into a small tooth; palm transverse, sinuous, much overlapped by the finger. Peraevpods 1 and 2 rather short, simple, nearly destitute of spines or setde. Peraeopod 3, 24 joint piriform, 4th Jonger than 5th or 6th, 6 with a row of strong spines along the reverted front margin; finger short. Peraeopod 4 twice as long as 34; peraeopod 5 still longer, finger as in 34 and 4b reverted. Uropods 1 and 2 each with strong spines on pedunele and rami. Uropod 3 with peduncle as broad as long, and carıying a few setae but no spines; inner ramus not half as long as outer. Telson broader than long, apically rounded. Colour dirty grey. L. 4 mm. New Zealand (Brighton Creek (salt water) near Dunedin). 3. Gen. Camacho Stebb. 1888 Camacho (Sp. un.: ©. bathyplous), T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1178. Head, mouth-parts, peraeon with its side-plates and gnathopods 1 and 2 (9) nearly as in Xenodice (p. 699), but differing as follows. Mandible with spines in spine-row numerous. Maxilla 1, inner plate with a single apical seta. Maxillipeds with finger of palp as long as the 34 joint. Antenna 1 with elongate 1° joint (the rest unknown). Pleon segment 4 not especially elongate. Pleopods, peduncle distally widened. Uropods 1—3 biramous. Uropod 3 with short broad peduncle and small rami, the outer longer than the pedunele, the inner minute. Telson simple. 1 speeies. Kun: Camacho, Cerapus 665 1. C. bathyplous Stebb. 1888 C. b., T. Stebbing in: Rep. Voy. Challenger, 0.29 p. 1179 t. 197. Oo. Body elongate, head and peraeon subdepressed, pleon compressed; peraeon segments 3—7 laterally dimpled. Head, lateral lobes very small, subaeute. Side-plates all shallow, for the most part not contiguous, 18 — 41h with front corner direeted forward. Pleon segment 3, postero-lateral corners obtusely quadrate. Eyes wanting. Antenna 1, 1° joint considerably longer than the head. Antenna 2, antepenultimate. joint of peduncle at least half as long as 1° joint of antenna 1. Upper lip broad. Mandible, 10 spines in spine-row; spines of 34 joint of palp very elongate. Maxilla 1, outer plate with 11 spines, 24 joint of palp with 8 apical spine-teeth. Gmatho- pods 1 and 2, 34 and 4! joints short, 5th but little shorter than 24, rather longer and narrower than the oval 6t%,”both strongly armed, with slender pectinate spines; finger matching the convex ill-defined palm; 24 and 5t" joints longer in gnathopod 2 than in gnäthopod 1. Branchial vesicles and marsupial plates narrow. Pleopods 1—3, peduncle short, the members of each pair meeting distally; slender rami wide apart; coupling spines much dentate, eleft spines long; 1° joint of inner ramus dilated proximally. Uropod 1, peduncle longer than outer ramus. Uropod 2 shorter, peduncle rather longer than the subequal, spinose rami. Uropod 3, pedunele almost broader than long, expanded beyond the rami, the pair meeting under the telson. : Telson rather broader than long, nearly eircular, but with a produced angle on each side of the convex apex. L. 16 mm. South-Paeifie (lat. 419 S., long. 178% E.). Depth 2011 m. 4. Gen. Cerapus Say 1817 Cerapus (Sp. un.: ©. tubularis), Say in: J. Ac. Philad., v. 11 p. 49 | 1888 C., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 100, 1157 | 1898 C., A. Della Valle in: F. Fl. Neapel, v.20 p. 376 | 1894 ©., 6. O. Sars, Crust. Norway, v.1 p. 606 | 1840 Cera- podina (Sp. un.: ©, abdita), H. Milne Edwards, Hist. nat. Crust., v.3 p. 62. Body slender; depressed pleon small, its after part strongly flexed. Head with distinet rostrum; eyes at lateral eorners. Side-plates 1—4 very small, 5th and 6th larger, 5th—7th pilobed, front lobe the deeper. Antenna 1 without accessory flagellum. Antennae 1 and 2, flagellum short. Upper lip not bilobed. Mouth-parts normal. Mandible, 34 joint of palp fully as long as 24, Maxilla 1, inner plate not or little setose, outer with 9 or 10 apical spines. Maxilla 2, inner plate not fringed on inner margin. Gmnatho- pod 1 subchelate.e Gmnathopod 2 (Fig. 112 p. 667) complexly subchelate and powerful in S, in O feeble and simple. Peraeopods 1 and 2 (Fig. 113 p. 667) short, 24 joint broad and long, glandular, front margin convex, base of joint expanded in peraeopod 1. Peraeopods 3—5 short, recurved, finger very short, bidentate. Peraeopod 3 (Fig. 114 p. 667), 24 joint rather expanded, short, 4th distally expanded on both sides of 5th, Peraeopods 4 and 5, 24 joint variable as to expansion. Branchial vesicles narrow, attached only to peraeopods 1—3. Marsupial plates 1—3 narrow, 4% large. Pleopod 1 large, 24 and 34 guccessively smaller, with 1 ramus dwindled. Uropod 1 normal. Uropods 2 and 3 uniramous, the ramus short, uncinate. Telson short, broad, bilobed, densely spinulose above. It is doubtful whether all the above characters are certainly applicable throughout the genus. 6 species. 666 Cerapus Synopsis of species: 1 Antenna 1, 1st joint distally widened — 2. Antenna 1, 1st joint not distally widened — 3. 9 f Antennae 1 and 2, flagella 2-jointed.... . . 1. C. erassieornis . . p. 666 \ Antennae 1 and 2, flagella 4- or 5-jointed . . . 2. C.sismithi . . . p.666 3 f Antennae 1 and 2, flagella 3-jointed. .... . 3. C. tubularis . . . p. 667 \ Antennae 1 and 2, flagella 4—6-jointed — 4. Antenna 1, 3d joint of peduncle much longer 4 | LITT RE RR SE BEN, OR 4. C. flindersi . . . p.668 - = ) Antenna 1, 3d joint of pedunele not much longer 0» than 2d — 5. Gnathopod 2 in d, inner tooth of 5th joint 5 | prominent, aeufe, =... Silea nn a0 5. C. abditus . . . . p.668 Gnathopod 2 in 5, inner tooth of 5th joint not ”. DRDMERONE, ODIRBO 2 00 reine an 6. C. calamicola . . p. 669 1. C. erassicornis (Bate) 1857 Siphonocetus c., Bate in: Ann. nat. Hist., ser. 2 v.19 p.149 | 1862 Siphonoecetes c., Bate & Westwood, Brit. sess. Crust., v.1 p.469 f. | 1882 Cerapus c., G. O.Sars in: Forh. Selsk. Christian., nr. 18 p.113 1.6 f.8 | 1893 ©. c., A. Della Valle in: F. Fl. Neapel, v.20 p.378 t.55 f.52 | 1894 C. c., G. O. Sars, Crust. Norway, v.1 p. 607 t. 217. Peraeon segments 1 and 2 in © shorter than any of the following 5; but in S segment 1 is not shorter and segment 2 much longer. Head, rostrum rather large, acute; lateral lobes short, obtuse. Side-plate 5 much the largest, its front lobe broad and deep. Pleon segment 3, postero-lateral corners rounded. Eyes small, round, dark. Antennae 1 and 2 very setose, short, subequal. Antenna 1 the stouter, slightly the longer, nearly '/, as long as body; 1° joint about as long as 24 and 34 combined, much broader, widened distally and produced to a triangular lobe over 24 joint, which is as long as 3; flagellum scarcely longer than 34 joint of peduncle, with 2 joints, last minute. Antenna 2, ultimate and penultimate joints of pedunele sub- equal; flagellum as in antenna 1. Gnathopod 1, 5tk joint nearly as long as 6%, distally wide with setose lobe, 6! wide at base; palm oblique, scarcely defined; finger long. Gmnathopod 2 in GC, 24 joint expanded to a broad oval, 5tk large, scarcely widening distally, front margin sinuous, partially serrate, hind margin produced near centre to a strong tooth, distally forming a transverse palm, defined by a tooth with smaller one within; 6tk joint shorter, much narrower, projecting finger-wise over palm of 5%, while the long finger impinges on middle tooth of 5%, Gnathopod 2 in Q feeble, 24 joint slightly widened; 5t joint triangular, broader'than the narrowly oval or fusiform 6", which is without distinet palm. Peraeopods 4 and 5 with 24 joint little expanded, especially that of peraeopod 5. Uropod 1, outer ramus much larger than inner, outer margin spinulose. Uropod 2 only about half as long as 1%, ramus oblong oval. Uropod 3, peduncle rather thick, ramus extremely minute. Telson with 2 dorsal rows of sharp, upturned spinules. Colour pale yellow. L. 0 4, 0 5 mm. Inhabits a free membranous tube, eylindrical, open at both ends, 1st joint of antenna 1 acting as an operculum. North-Sea (Northumberland; Jaederen [Norway], depth 75—94 m). 2. C. sismithi Stebb. 1888 ©. s., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1158 t.124 | 1893 C. s., A. Della Valle in: F. Fl. Neapel, v.20 p.379 t.55 f.53—57 | 1894 CO. s., G. O. Sars, Crust. Norway, v.1 p. 607. EEE, en 2 dr me an u ae ci Cerapus 667 oO unknown. — G. Peraeon segment 2 not longer than any of the succeeding peraeon. segments. Head, rostrum acute, slightly depressed, reaching beyond the slightly rounded lateral lobes. Side-plate 5 very broad, front lobe rather deeper than in the other side-plates. Eyes small, round. Antenna 1 less than half as long as body; 1° joint shorter than 24 and 34 . combined, distally widened; rounded process above produced over 24 joint, process below acute; 3° joint shorter than 24; ; Nagellum rather longer than 1°* as 24 joint 4a joint - st joint -- Fig. 112. . Fig 113. Fig. 114. Gnathopod 2. Peraeopod 1. Peraeopod 3. Fig. 112—114. C.sismithi, Q. of peduncle, 5-jointed. Antenna 2 a little longer, ultimate and penultimate Jjoints of peduncle subequal; flagellum longer than ultimate joint of peduncle, 4-jointed. Gnathopod 1, 5th joint distally rather wider than 6%, which is widest near base; palm. serrate, finely pectinate; finger oceupying apex of 6 joint, pectinate and with decurrent subapical tooth. Gnathopod 2 (Fig. 112), 24 joint widest near base, subrectangular, 5!" much broader and longer than 24, wide at base, much wider distally; front margin sinuous, hind rather longer, ending in a tooth, a large convex denticulate process oceupying its palmar or distal margin between the tooth and base of strap-shaped, much curved 6!" joint, which is nearly as long as 5tt, 4—5 times as long as broad, with tooth near base and adpressed teeth or spines near apex of inner margin; finger less than '/, as long as 6!" joint. Peraeopod 1 (Fig. 113), the large 24 joint widest above, proximal front angle broadly rounded, 4 joint much longer than broad. Peraeopod 2, 24 joint broadly oval, 4th and 5% joints longer than in peraeopod 1. Peraeopods 4 and 5, 24 joint well expanded, though successively rather narrower and longer than 24 joint of peraeopod 3. Peraeopod 3 see Fig. 114. Uropods 1-3 and telson as in C. erassicornis. L. 3 mm. In eylindrical tubes of sand. Cumberland Bay [Kerguelen Island]. Depth 226 m. 3. C.tubularis Say 1817 ©. t., Say in: J. Ac. Philad., v. 11 p. 50, 96 1.4 f.7—11| 1880 C. t., S.I. Smith in: Tr: Connect. Ac., v.4 p.277 t.2a | 1888 C. t., T. Stebbing in: Rep. Voy. Challenger, v.29 p.101, 522 | 1893 C.t., A. Della Valle in: F. Fl. Neapel, ».20 p.378 1.55 f.46—51 | 1894 ©. t., G. O. Sars, Crust. Norway, v.1 p. 607. Body broad, depressed, shallow, in J tapering slightly and continu- ously from head to telson, in Q 4 and 5th peraeon segments each about 668 Cerapus twice as long as 1° or 7%, Head with slight dorsal carina in front, rostrum small. Side-plate 5 the largest. Eyes small, black. Antennae 1 and 2 subequal, shorter in Q than in d. Antenna 1 in © rather more than half as long. as body; 1°t joint stout, laterally compressed, lower margin with carina prominent near base, 24 and 34 subequal, each rather longer than 1°: and subequal to 3-jointed flagellum; 1° joint of flagellum rather longer than 24 and 34 combined. Antenna 2 slightly shorter, scarcely stouter; ultimate joint of pedunele a little longer than penultimate, flagellum scarcely as long as ultimate, 3-jointed, 1° joint considerably longer than 24 and 34 combined. Gnathopod 1 about as in C. sismithi (p. 666). Gnathopod 2 in C in general shape as in C. sismithi, but front margin of 5tk joint convex, tooth of hind margin more produced, its palmar margin shorter, occupied by a cavity and. a small tooth near the base of the 6% joint, which is only about twice as long as broad, hind margin irregular, minutely denticulate, finger stout, serrulate, rather shorter than 6!" joint. Peraeopod 1 in d, the large glandular 24 joint reetangular, widest proximally, the projeeting front angle narrowly rounded; 4! joint broader than long, 5!" a little shorter, nearly square. Peraeopod 2 in S, 24 joint broader in the middle, other joints as in peraeo- pod 1. Peraeopod 1 in ©, 24 joint proportionally broader than in JS, and angle different. Peraeopod 2 in Oo, 24 joint broader and more oval in outline than in d. Peraeopod 3, 4! joint with long, narrow, spatulate process behind, tipped with 1 short and 3 long plumose setae; the process overlapping the 5th joint, which is shaped like it and is apically squamose, carrying 1 seta. Peraeopod 4, 24 joint about as long as 4th, longer than broad. Peraeopod 5 a little more slender. Rest like ©. erassicornis (p. 666). Colour almost black from erowded specks of dark purplish pigment, extremities of appendages eolourless, semi-translucent. L. 4—5 mm. Tube free, reaching 7 mm, black, eylindrical, slightly enlarged at one or both ends. North-Atlantie (Egg Harbor [New Jersey]; Vineyard Sound, depth 15—19 m; Noank Harbor [Conneetieut]). 4. C. flindersi Stebb. 1888 ©. f., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1163 t.125 | 1893 C. f, A. Della Valle in: F. Fl. Neapel, v.20 p.380 | 1894 C. f, 6 ©. Sars, Crust. Norway, v.1 p. 607. o. Nearly allied to ©. tubularis (p. 667). Antenna 1, 24 joint much shorter than 1% or 34 joint; flagellum as long as 34 joint, 4-jointed. Antenna 2, penultimate joint of peduncle proximally wider than antepenultimate, consider- ably shorter than ultimate; flagellum rather longer than ultimate joint of pedunele, with 4 joints, 1° the longest. Maxilla 1, outer plate with 10 spines on apex, as compared with 9 in C. sismithi (p. 666). Peraeopod 1 as in C. tubularis with 4b joint broader than long; but peraeopod 2 with 4 joint much longer than broad, fully as long as 5!" and 6! combined. Peraeopod 3 with the lobe-like 5!" joint less produced than in C. tubularis; probably to era 3 belong the broad marsupial plates, as in .C. crassicornis (p. 666). . 5—6 mm. Flinders Passage [North-Australia]. 5. C. abditus R. Templ. 1836 C. a., R. Templeton in: Tr. ent. Soc. London, v.1p.188 1.20 f.5a—k | 1888 C. a., T. Stebbing in: Rep. Voy. Challenger, v.29 p.168 | 1893 CO. a., A. Della Valle in: F, Fl. Neapel, v.20 p.379 | 1840 Cerapodina abdita, H Milne Edwards, Hist. nat. Crust., v.3 p. 62. A ml 17 at a Gerapus, Cheyreuxius 669 Body elongate. Head large, laterally subtriangular, dorsally quadrate, most dilated anteriorly, a minute rostrum projecting forwards; front in lateral view almost vertical. Eyes a little prominent, small, round, black. Antenna 1 tapering, about °/, as long as body; 3 joints of peduncle subequal or 1° rather the shortest, 1% in figure with sub-basal widening; flagellum 5-jointed. Antenna 2, ultimate and penultimate joints of peduncle longer and stouter than those in antenna 1; flagellum 5-jointed. Antennae 1 and 2, setae of peduncle in double rows, longer towards apices of joints, joints of flagella with spines. Gnathopod 1, 5t% joint scarcely as long as 6th, distally a little widened and (in figure) produced to a short tooth, 6" narrowly oblong, at the apex transversely truncate but very narrow; the much curved finger, though short, reaching much beyond it. Gnathopod 2, 5tk joint extremely large, subreetangular, hind margin produced to a strong tooth, a smaller one adjacent, filling up the space between it and base of the slightly curved 6b joint, which is widest at base, has a coneave smooth hirid margin and its apex occupied by the strong, much eurved, but not very long finger. Peraeopods 1 and 5 in barmony with genus. L. about 3 mm. Tube, nearly 5 mm long, papyraceous, eylindrical, head of animal protrusible alternately from either end. At Mauritius or on the way thither from England. 6. C. calamicola (Giles) 1885 Cyrtophium e., G.M.Giles in: J. Asiat. Soc. Bengal, 0.54 p.54 t.1 | 1888 Cerapus c., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 563 | 1893 C. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 380. Body elongate, peraeon segments 4—6 the longest. Head subquadrate, rather long, rostrum small. Side-plates 5 and 6 (in figure) much the largest. Eyes (in figure) small, dark. Antenna 1 more than half as long as body; 3 joints of peduncle subequal, 1° the stoutest, slightly widened near base; flagellum 3—6-jointed. Antenna 2 rather longer, ultimate joint of pedunele rather longer than penultimate; flagellum with 3—6 equal joints (in figure 1°* much the longest). Gnathopod 1, 6% joint long, ovate; finger as long as 6° joint, inner margin very finely serrate. Gnathopod 2 very large, 5th joint triangular, hind margin produced to a strong incurved tooth, separated by a rather broad cavity from a smaller, blunter tooth, near base of the long, ovate 6" joint (in figure rather rectangular); finger as long as 6tk joint, eurved, acute, inner margin with a peculiar serrature of square, chisel-edged teeth. Peraeopod 3, 24 joint (in figure) much longer than broad; finger having hind margin provided with two curious short finger-like processes, Peraeopods 4 and 5, 24 joint broadly oval, much more expanded than in peraeopod 3; finger rounded and provided with a large tuft of hairs. Pleopod 3 the smallest. Uropod 1, inner ramus 2-jointed (?1-jointed, tipped with a spine). Uropod 2, inner ramus rudimentary (waiting?). Colour golden brown with deep chocolate blotches. L. 3—5 mm. Tube 5—10 mm long, brown banded with light yellow and black. North-West of Bay of Bengal (Orissa coast). 5. Gen. Chevreuxius Bonnier 1896 Chevreuxius (Sp. un.: ©. grandimanus), J. Bonnier in: Ann, Univ. Lyon, 2.26 p. 663. Oo unknown. — JS. Body elongate, depressed. Side-plates very small, not in contact. Eyes wanting. Antennae 1 and 2 with the pedunele long 670 Ühevreuxius, Eriethonius and slender, longer than flagellum. Accessory flagellum of antenna 1 very short. Lower lip, inner lobes well developed. Mandible, 34 joint of palp the longest. Maxilla 1, inner plate small, with 1 seta. Gnathopod 1 com- plexly subchelate, the finger impinging against either the small 6!" or the very large 5th joint. Gnathopod 2 much smaller, subchelate. Uropods 2 and 3 short, one-branched. Telson entire. 1 species. 1. C. grandimanus Bonnier 1896 C. g., J. Bonnier in: Ann. Univ. Lyon, v. 26 p. 663 t. 40 f.3. Head large, rostrum and inter-antennal processes little prominent. Pleon segments 1—3, postero-lateral corners rounded. Antenna 1, 1° joint stoutest, little shorter than 24, with 3 spines on under margin; 3a joint rather long, though little more than half as long as 2; flagellum 8-jointed;; accessory flagellum with 2 joints, 24 minute. Antenna 2 a little longer, not stouter; ultimate joint of pedunele longer than the long penultimate; flagellum not long, with 4 joints, with 2 strong spines at end of 24, Upper lip distally rounded (slightly notched in figure). Maxilla 1, with 10 spines on apex of inner plate. Maxillipeds, outer plates much larger than inner; 4% joint of palp short. Gmnathopod 1, 24 joint channelled in front, 34 and 4eh very short, 5tR enormous, hind margin produced to a tooth, base of 6b not nearly occupying truncate distal margin of 5%, its hind margin forming a blunt tooth, which defines the excavate, very oblique palm, completely over- lapped by the finger. Gnathopod 2 very slender; the narrow 5tk joint longer than the equally narrow 6t", which form a little excavate palm, defined by a tooth and scarcely overlapped by the short finger. Peraeopods 1 and 2, 4th joint rather long. Peraeopods 3—5, 24 joint narrowly oval. Peraeopod 3 the shortest. Uropod 1, peduncle long and stout, longer than the rami, all armed with spines; inner ramus the shorter. Uropod 2, peduncle shorter but stout, the ramus short and narrow. Uropod 3 very short, peduncle stout, ramus narrow, ending in 2 setules. Telson broader than long, with upturned denticle at each angle of the truncate apex. L. nearly 4 mm. Bay of Biscay. Depth 950 m. 6. Gen. Ericthonius M.-E. 1830 RE (Sp. un.: E. difformis), H. Milne Edwards in: Ann. Sei. nat., v.20 p.382 | 1888 E., T. Stebbing i in: Rep. Voy. Challenger, v.29 p. 142, 285, 1672 | 1837 Erichthonius, Barmeister, Handb. Naturg., p. 569 | 1893 E., A. Della Valle in: F. Fl. Neapel, v.20 p. 381 | 1894 E., G. O. Sars, Orust. Norway, v.1 p. 601 | 1840 Erichtonius, H. Lueas in: Hist. An. artie., Crust. Arach. Myr., p. 231 | 1852 Pyetilus, J. D. Dana in: P. Amer. Ac., «2 p.218 | 1853 P., J. D. Dana in: U. S. expl. Exp., v.13u p. 911, 973. . Side-plates small, with a tendency of 24 and 5th to exceed the others in size. Head rather elongate; lateral lobes produced. Pleon segments 1—3 not wide or deep; postero-lateral corners rounded; segment 6 longer than segment 5. Eyes on lateral lobes. Antennae 1 and 2 slender, subequal, setose; pedunele long; flagellum of several joints. Antenna 1 without accessory flagellum. Antenna 2 attached much behind antenna 1; antepenultimate joint of pedunele long. Upper lip with rounded entire margin, and acute process on surface. Lower lip with inner lobes. Mandibular palp long, 34 joint lamellar, densely setose. Maxilla 1, inner plate with a few setae, outer with 9 apical spines; 24 joint of palp long. Maxilla 2, inner plate Dr a Use die. ua ar Eriethonius 671 with fringed inner margin. Maxillipeds, palp rather narrow. Gnathopod 1 alike in d and Q, subchelate, 5tk joint not shorter than 6%. Gmathopod 2 larger, in © complexly subchelate, 5! joint very large, produced into a tooth; in Q normal, 5tk joint much smaller than 6%, produced into a narrow lobe. Peraeopods 1 and 2, 24 joint expanded. Peraeopods 3—5, 24 joint not greatly expanded, the external expansion oblong, the inner oval; in peraeopod 3 the finger short, reverted, with dentiele on convex margin. Branchial vesicles small, absent from gnathopod 2. Marsupial plates broad. Pleopods 1—3 normal. Uropods 1 and 2 biramous. Uropod 3, ramus single, small, tipped with 2 upturned spinules. Telson short, broad, with the lateral lobes densely spinulose on surface. 6 species accepted, 3 doubtful. Synopsis of accepted species: 1 Gnathopod 2 in d, 5th joint bidentate — 2. Gnathopod 2 ind, 5th joint unidentate — 3. [ Peraeopod 3, 2d joint not produced downward .-l. E. brasiliensis . . p.671 1) Peraeopod 3, 2d joint acutely produced downward 2. E.pugnax. .. .p.672 Gnathopod 2 in d, palmar margin of 5th joint ee a N er 3. E. macrodactylus p.672 8 Gnathopod 2 in d, palmar margin of 5th joint not deeply ineised — 4. ee Bee 4. E. difformis . . : p.672 4 Eyes large — 5. Gnathopod 2 ind, 6th joint with broadly lobed 5 ee re ee A 5. E.hunteri. . . . p.673 Gnathopod 2 ind, 6th joint with narrowly tubereled EEE RE RE 6. E. megalops . . . p.673° 1. E. brasiliensis (Dana) 1853 & 55 Pyetilus b., J. D. Dana in: U. S. expl. . Exp., v.13u p.976; t.67 £.5a—h | 1853 Eriethonius bidens, A. Costa in: Rend. Soe. . Borbon., n.ser, v.2 p. 177 |1857 Erichthonius rapax, Stimpson in: Boston. J. nat. Hist., v.6 p.515 | 1872 Cerapus r., A. Boeck in: Forh. Selsk. Christian., 1871 p.40 t.1f.2| 1857 Ericthonius difformis, Bate in: Ann. nat. Hist., ser.2 v.19 p.148 | 1893 Erich- thonius d. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.381 t.1 £.10; t.9 £.1—20| 1862 Cerapus abditus (err., non Templeton 1836!), Bate & Westwood, Brit. sess. Crust., v.1 p.455 f. | 1876 C. a., A. Boeck, Skand. Arkt. Amphip., v.2 p.613 t.28 f.4 | 1894 Erichthonius a., &. O. Sars, Crust. Norway, v.1 p.602 t.215 | 1898 E. a.?, Sowinski in: M&m. Soc. Kiew, v.15 p.458 | 1862 Cerapus a, + C. brasiliensis, Bate, Cat. Amphip. Brit. Mus., p. 263 t.45 f.2; p.267 t.45 f.8 | 1864 CO. latimanus, E. Grube in: Jahresber, Schles. Ges., v.41 p.63 | 1873 C. minax, (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p. 569. Body moderately slender, with broadly vaulted back. Head, lateral lobes broad with a small apical point. Side-plates contiguous, 24 and 5t" the largest, 24 with close-set short linear markings round part of margin. Eyes rather large, rounded, prominent, bright red. Antenna 1 more than half as long as body, 24 joint longer than 34, 34 than 1%, flagellum nearly as long as peduncle, about 12-jointed. Antenna 2 subequal to antenna 1, ultimate joint of pedunele a little longer than penultimate; flagellum about 9-jointed. Gnathopod 1 ind‘, 5tk joint broad, rather longer than 6*b, 6 gently convex in front, behind quadrately rounded, with palm subequal to hind margin; finger matching palm. Gnathopod 2 in d, 24 joint widening from a narrow neck, 5! very large, the palmar -part produced into 2 teeth, the inner the smaller; 6% joint much narrower but not much shorter than basal part “os 672 Eriethonius of 5th, hind margin slightly eoncave in the middle; finger very large, faleiform; but both 6*b joint and finger variable in size and shape. Gmathopod 2 in Q, 5th joint produced along hind margin of 6% in a narrow lobe distally armed with setae and recurved spines, 6! joint large, palm rather oblique, longer than hind margin, finger matching. Peraeopods 1 and 2, 24 joint broadly oval, finger smooth. Peraeopods 3—5 successively longer; 24 joint successively narrower in proportion to length, oblong (Dana: nearly orbieular in peraeopod 3, narrow in peraeopod 5); in all finger with denticle on hinder convex margin. Pleopods 1—3 normal, with coupling spines and cleft spines. Uropods 1 and- 2, pedunele longer than rami, margins more or less pectinate, spines small except the apical; in uropod 2 the rami laminar. Uropod 3, pedunele broad at base, much longer than the ramus, which ends in 2 upturned spines. Telson twice as broad as long, triangularly pointed between 2 rounded lobes, densely spinulose on the surface. Colour brownish or orange, with dots. L. 4—12 mm. Oceupies tubes affixed to hydroids and algae. Atlantie with adjoining seas (Europe from South- and West-Norway (depth 19—75 m) to Adriatie and ?Bosphorus; Rio Janeiro; Vineyard Sound); North-Paeifie (San Franeiseo, depth 4 m). 2. E. pugnax (Dana) 1852 Erichthonius p., Pyctilus p., J. D. Dana in: P. Amer. Ac., v.2 p.218 | 1853 &55 P.p., J.D. Dana in: U. S. expl. Exp., v,13u p. 975; t. 67 f. 4a—d | 1862 Cerapus p., Bate, Cat. Amphip. Brit. Mus., p. 267 t.45 f.7 | 1898 Erich- thonius difformis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 381. Closely related to E. brasiliensis (p. 671), but the 6tk joint of gnatho- pod 2 in C sparingly erose within, hind margin (in figure) eomposed of 3 smoothly rounded tubereles; peraeopod 3 is said to have the 24 joint of the same form as in E. macrodactylus, with a narrow acute prolongation of the hind margin. L.? Sooloo Sea. 3. E. macrodactylus (Dana) 1852 Erichthonius m., Pyectilus m., J. D. Dana in: P. Amer. Ac., v.2 p. 218 | 1853 & 55 P. m., J. D. Dana in: U. S. expl. Exp., v. 1311 p- 974; t. 67 f. 3a—c | 1862 Cerapus m, Bate, Cat. Amphip. Brit. Mus., p. 266 1.45 f.6| 1893 Erichthonius difformis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 381. Distinguished‘ from E. difformis especially by the long tooth of the 5th joint in gnathopod 2 being separated from the base of the 6!" joint by a very deep cavity, and by the 24 joint of peraeopod 3 having a narrow acute prolongation of the hind margin. Side-plate 5 smaller than either the 4th or 6th (in figure, but?). L.? S00loo Sea. 4. E. difformis M.-E. 1830 E.d., H. Milne Edwards in: Ann. Sei. nat., v.20 p- 382 | 1888 E.d., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 595 | 1859 Erich- tonius d., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.ö nr. 1 p. 17 | 1879 Cerapus d,, Hoek in: Tijdschr. Nederl. dierk. Ver., v.4 p. 119 t.5 £.14,15; t.6 £.3; t.8 £.11,12]| 1889 C. d., Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.229 t.10 £.15 | 1894 Erichthonius d., G. O. Sars, Crust. Norway, v.1 p. 604 t.216 f.1 | 1842 Podocerus leachii, Kreyer in: Naturh. Tidsskr., v.4 p. 168 | 1853 Cerapus whitei, Gosse, Rambles Devonsh., p. 382 | 1857 Podocerus punctatus, Batein: Ann. nat. Hist., ser.2 v. 19 p. 148 | 1862 Cerapus difformis + Dercotho& p., C.p., Bate & Westwood, Brit. sess. Crust., e.1 ai Zn u un Dun nn LU L 2 Zn ME a ee er er BE at Fi Br ea BICHERT Eriethonius 673 p- 457 £.; p. 461 f. | 1862. D. p., C.p. + C.d. + C.leachii, Bate, Cat. Amphip. Brit. Mus., p- 260 t.44 f.6; p.265 t.45 f.5; p. 268 | 1868 C. macrodactylus var. pontica, Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p. 97 & 1871 C. longimanus, A. Boeck in: Forh. Selsk. hrolien., 1870 p. 252. Possibly not distinet from E. brasiliensis (p. 671). Body more slender than in E. brasiliensis, especially in JS (Sars). Head, lateral lobes with the apical point sometimes well marked (not noted by Sars). Side-plates in S differing from those in ©, the 24 standing notably apart, and considerably larger than the others. Eyes rather small, rounded, dark red to black. Antennae 1 and 2 elongate, 24 and 3 joints in antenna 1 subequal. The chief distinetion from E. brasiliensis rests with gnathopod 2 in S, which is of great length, the neck or proximal part of joint 2 elongated, 5% joint thrice as long as broad, slightly con- strieted at the middle, the tooth or thumb elongate, nearly straight, separated from the 6! joint by a narrow palmar cavity, the tooth sometimes having a subapical inner tooth; 6*% joint rather narrow, hind margin sinuous in the middle, with a projection at base; finger with setae on both margins and a group of very long ones near the tip. Colour greyish, mottled with brown spots. L. 4—12'5 mm. Tubes attached. North-Atlantie with adjoining seas (Europe from Trondjhemsfjord to the Black Sea; Azores; United States of America, depth 0—200 m). 5. E. hunteri (Bate) ?1853 Cerapus rubricornis, Stimpson in: Smithson. Contr., v.6 nr.5 p.46 t.3 f.33 | ?1867 ©. r., C.rubiformis, Packard in: Mem. Boston Soe., v.1 p. 297 | 1862 C. hunteri, Bate, Cat. Amphip. Brit. Mus., p. 264 t.45 f.3 | 1876 C. h., A. Boeck, Skand. Arkt. Amphip., v.2 p.618 t.28 £.5 | 1894 Eriethonius h., T. Stebbing in: Bijdr. Dierk., v.17 p. 45 | 1894 Erichthonius h., G. O. Sars, Crust. Norway, v. 1 p- 605 t. 216 f. 2 | 1880 Ericthonius difformis (part.), S. I. Smith in: Tr. Connect. Ac., v.4 p.279 | 1893 Erichthonius d. (part.), A. Della Vallein: F. Fl. Neapel, v.20 p.382. Closely related to E. difformis, but differing as follows. Body in d much broader than high (Stimpson). Side-plate 5 larger than side- plate 2, with front lobe very large. Eyes rather large. Antennae 1 and 2 perhaps more setose, and very hairy (Stimpson); each with flagellum of 12 joints; 34 joint of antenna 1 usually shorter than 24, Gnathopod 1, 6th joint rather shorter than 5tk, variably expanded. Gnathopod 2 in J more robust; 5tk joint not constrieted, stout; the tooth not elongate (not always so short as represented by Sars); 6th joint broad, approximate to tooth of 5th, its hind margin lamellar, divided in the middle by a small ineision, the two lobes thus formed, however, being rather variable in their relative pro- portions, ag not very large or rather large, without any notable setae. Peraeopods 1 and 2, 24 joint expanded, but less "broad in proportion to length than in E. brasiliensis (p. 671). Peraeopods 1—3, 24 joint oblong, successively narrower. Peraeopods 4 and 5, finger with denticle on hind margin scarcely perceptible.. Uropod 3 with a rather longer and more slender ramus. L. 5—15 mm. Arctic Ocean, North-Atlantie and North-Sea (Norway; North-East-England; North-America; lat. 73° N., long. 34° E.); Kattegat. 6. E. megalops (0. Sars) 1879 Cerapus m., G. O. Sars in: Arch. Naturv. Kristian., v.4 p.461 | 1885 Erichthonius m., G. O. Sars in: Norske Nordhavs-Exp., v. 6 Crust. I p.210 t.17 £.4a—b | 1893 E. difformis (part.), A. Della Valle in: F, Fl. Neapel, v.20 p. 383. Das Tierreich. 21.Lief.: T.R. R. Stebbing, Amphipoda I. 43 674 Eriethonius, Cerapopsis Apparenily very near to E. hunteri (p. 673), but in gnathopod 2 in J the tooth of 5t Jain reaches nearly the extremity of the 6!" and the hind margin of the 6% joint is crenulate or furnished with several tubereuliform projeetions, as described by Stimpson in E. brasiliensis (p. 671). Telson small, tubular, armed at the apex with a number of small spines. Colour whitish, variegated with brown. L. about 7 mm. Aretie Ocean (North-West of Finmark, depth 1217 m; South of Jan Mayen, depth 179 m). E. fasciatus (Stimps.) 1853 Cerapus f., Stimpson in: Smithson. Contr., ®.6 or.5 p.49 t.3 f.85 | 1893 Erichthonius difformis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 387. L. nearly 8 mm. Hake Bay [Grand Manan]. Depth 66m, on a gravelly bottom. E. peculans (Dana) 1852 Amphitoe p., J. D. Dana in: P. Amer. Ac, v2 p- 213 | 1853 & 1855 Dercothoe speculans, J. D. Dana in: U. S. expl. Exp.. v. 1311 p. 971; t. 67 f.1a—h | 1862 D. s., Cerapus s., Bate, Cat. Amphip. Brit. Mus., p.260 t.44 £.8 | 1893 Erichthonius difformis (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 381. Perhaps the 2 of E. pugnax or E. macrodactylus (p. 672.) Sooloo Sea. Depth 12 m. E. sp., Dana 1853 & 55 Dercothoe emissitius (part.)? (err., non Gammarus e. J. D. Dana 1852), J. D. Dana in: U.S. expl. Exp., e. 1311 p. 970; t.66 £. 10a—e. Sooloo Sea. 7. Gen. Cerapopsis Della Valle 1893 Cerapopsis (Sp. un.: C. longipes), A. DellaVallein: F.Fl. Neapel, v.20 p.356, 388. Side-plates 2—5 large. Antenna 1 without accessory flagellum. Antennael and 2 with flagellum few-jointed. Mouth-parts as in Eriethonius (p. 670), except as follows. Mandibular palp has the 34 joint rather long, apically rounded. Maxilla 1 has the inner plate longer, tipped with 1 large and 1 small seta, and outer plates of maxillipeds are more prolonged. Gnathopod 1 with palm undefined. Gnathopod 2 becoming chelate in C, remaining subehelate, with palm undefined, in ©. Gmathopods 1 and 2 much larger in S than in ©. Peraeopods 1 and 2, 24 joimt narrow. Peraeopods 3 and 4, 24 joint broad, finger reverted. Peraeopod 5, 24 joint not very broad. Uropods 1 and 2 biramous. Uropod 3, pedunele not expanded, ramus single. Telson entire. l species. r 1. C.longipes Della Valle 1893 ©. 1, A. Della Valle in: F. Fl. Neapel, v.20 P.388 t.3 £.10; 1.9 £.20--40; t.56 £.1. Body eompressed, rather robust. Side-plate 1, lower front, angle more produced in 9 than in ©, 24 covering 24 joint of limb in 9 but not ind, 34 trapezoidal, 4 rectangular, 5t® with front lobe as deep as 4b, Antenna 1, 1° joint stout, °/, as long as 24, 34 as long as 1°; flagellum less than half as long as pedunele, with 3 rather long joints. Antenna 2 a little longer than antenna 1, antepenultimate joint of pedunele rather long, penultimate shorter than ultimate, flagellum little longer than ultimate, 3-jointed. Gnathopod 1. in Cd, 24 joint slender, 4!" short, 5tk more than 4 times as long as broad, 6% also narrow and a little shorter; finger slender, a little shorter than the 6'h joint. ‘Gnathopod 2 in adult d much stouter and rather longer; 24 joint Br Ei 4 Mr INA E a 7 E 3 3 - ER ar dr Ser * DETRE Rd ZEE u, op” Cerapopsis, Neohela 675 comparatively short, robust, 3—5'% short, 6% enormously developed, hind margin produced to a bifurcate process, the very large curved finger forming a very elongate cone or an actual cylinder, and combining with the variable process of the 6tl joint to form a true didactyle chela. Gnathopod 1 in oO, 5th joint as broad as 6%, and a little longer, 6 almond-shaped, finger large but shorter than 6! joint, which in young J' it outstrips in length. Gnathopod 2 in O a little larger than gnathopod 1; 39 and 4tk joints short, 5th also short, broader than long, 6t% almond-shaped, finger robust but short. Peraeopods 1 and 2 slender, finger small and slight. Peraeopod 3, 24 joint almost eircular, its margins entire; the other joints short, compact, 6tk with apical seta, finger short, stout. Peraeopod 4 rather longer; 24 joint less broad, 6! with apical spine simulating a second finger. Peraeopod 5 rather longer, 24 joint scarcely half as long as broad, finger arched. Pleopods 1—3, peduncle rather stout, inner ramus narrower but rather longer than outer, inner margin of 1° joint smooth; outer ramus proximally very hroad, Uropods 1 and 2 not very spinose. Uropod 3, peduncle longer than ramus, which is slightly ineurved and tapering, with apieal spine. Telson triangular, with 2 setules on each side of upper surface, apex rounded. Colour in d, head and segments yellow in front, brown behind, side-plates 1—4 each with a brown blotch; in © back light brown, yellow blotches on sides; eggs (large, very few) reddish yellow. L. 3 mm. Bay of Naples.. In fine sand, depth 10—20 m. 8. Gen. Neohela S. I. Sm. 1861 Hela (Sp. un.: H. monstrosa) (non Münster 1840, Decapodal), A. Boeck in: Forh. Skand. Naturf., Mode 8 p.668 | 1876 H., A. Boeck, Skand. Arkt. Amphip., v.2 p.643 | 1886 H., Gerstaecker in: Bronn’s Kl. Ordn., v.5ır p.495 | 1881 Neohela, 8. I. Smith in: P. U. S..Mus., v.3 p.448 | 1888 N., T. Stebbing in: Rep. Voy. Challenger, v.29 p.322, 325, 1215 | 1895 N., A. Della Valle in: F. Fl. Neapel, v.20 p.342 | 1894 N., G. ©. Sars, Crust. Norway, v.1 p.623 | 1882 Helella, G. ©. Sars in: Forh. Selsk. Christian., nr. 18 p.3l. Body very slender, tapering backward; pleon slight, subeylindric, abruptly narrower than peraeon. Head quadrate. Side-plates small and shallow, not contiguous. Antennae 1 and 2 very long and slender, 1% with well developed accessory flagellum. Upper lip bilobed. Maxilla 2 not fringed on side of inner plate, otherwise mouth-parts in general as in Unciola (p. 676). Gnathopods 1 and 2 subchelate; 24 joint narrow, 5" not short, finger elongate. Peraeopods 1—5 long and slender, 24 joint linear. Pleopods 1—3 very slender and feeble. Uropods 1 and 2 biramous, slender, the rami spinose; uropod 1 much the longer. Uropod 3 small, peduncle very small, the single ramus much longer. Telson imperfectly defined from pleon segment 6, smooth, distally tapering. 2 species, Synopsis of species: Eyes imperfeetly developed, represented by whitish pigment 1. N. monstrosa . p.675 Eyes prominent, salmon-eoloured . . ..:.. 2... 2. N. phasma . . p.676 1. N. monstrosa (Boeck) 1861 Hela m., A. Boeck in: Forh. Skand. Naturf., Mode 8 p.668 | 1876 H. m., A. Boeck, Skand. Arkt. Amphip., v.2 p. 643 t.32 f.1| 1881 Neohela m., 8.1. Smith in: P. U. S. Mus., v.3 p.448 | 1887 N. m., H. J. Hansen in: Vid. Meddel, ser.4 v.9 p.168 | 1893 N. m. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.843 t.55 £.19—24 | 1894 N. m., G. O. Sars, Orust. Norway, v.1 p.624 t. 224 | 1882 Helella m., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p. 31. 43* nn DRS Ede SE 676 Neohela, Uneiola Peraeon segments 1—4 laterally rather expanded and angularly produced in front. Head, rostrum obsolete; front corners acute, little produced, sides projecting outward in a sharp tooth. Side-plates 1—3 acute in front. Pleon segment 3 without postero-lateral angles. Eyes represented on each side by a small patch of opaque whitish pigment. Antenna 1 longer than body; 24 joint 2—3 times as long as 1%, 34 rather longer than 1%; flagellum longer than peduncle, many-jointed, accessory flagellum not as long as 34 joint of pedunele, 6—10-jointed. Antenna 2 longer; ultimate and penultimate joints of peduncle very long, spinulose all round like peduncle of antenna 1; flagellum longer than pedunele, many-jointed. Gnathopod 1, 5tk joint densely setose, about as long as 24 or 6th, 6th also densely setose, widening gradually to the transverse palm, which has 2 sharp teeth in the middle, and is defined by a 34, the prolong- ation of the hind margin; finger projecting much beyond palm, its outer margin densely setose. Gnathopod 1 in Q like that of JS, but less strong. Gmnatho- pod 2 ‚smaller; 5t% joint shorter than 24, much narrower than. 6%, which widens to the oblique straight palm, defined by an obtuse angle; finger slender, setose on outer margin, reaching much beyond palmar spines. Peraeopods 1 and 2, 5tk and 6*& joints subequal; finger slight. Peraeopod 3, 5th joint much shorter than 6%, finger slight. Peraeopods 4 and 5 much longer than preceding; 5% joint short, finger faleiform, strong. Uropod 1, outer ramus in O, not in Q, widened. Uropod 3, ramus nearly thrice as long as pedunele. Telson triangular, with obtuse apex. Colour yellowish, semi-pellueid. L. © 25, d 28—30 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (West- and North-Norway, depth 188—514 m; Spitzbergen; Farö Isles, down to 2288 m; Baffın Bay); Kattegat. 2. N. phasma S.I. Sm. 1881 N.p., S. I. Smith in: P. U. S. Mus., v.3 p.448| 1894 N. p., G. O. Sars, Crust. Norway, v. 1 p. 624, 625 | 1693 N. monstrosa (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 343. d. Head, rostrum ‚slightly prominent, obtusely angular. Eyes large and prominently convex, salmon-coloured (in spirit). Antenna 1, 2% joint more than thrice as long as 1%, 34 considerably longer than 181; accessory flagellum as long as 34 joint of peduncle, 9-jointed. L. 26 mm. North-Atlantie (South of New England). Depth 680 m. 9. Gen. Unciola Say 1818 Umneiola (Sp. un.: U. irrorata), Say in: J. Ac. Philad., v. 11I p. 388 | 1888 U., T. Stebbing in: Rep. Voy. Challenger, v. 29 p.1168 | 1893 U., A. Della Valle in: F. Fl. Neapel, v.20 p. 336 | 1894 U., G. O. Sars, Crust. Norway, v. 1 p. 619 | 1845 Glauconome (Sp. un.: @. leucopis) (non Goldfuss 1826, Bryozoa!), Kreyer in: Naturh. Tidsskr., ser.2 v.1 p. 491, 501 | 1876 @., A. Boeck, Skand. Arkt. Amphip., v.2 p. 636 | 1862 Dryope, Driope (non .Dryope Robinean- Desvoidy 1830, Diptera!), Bate, Cat. Amphip. Brit. Mus., p. 276; t. 47. Body slender, rather depressed; peraeon long, alt segment 6 very short. Head square, with somewhat projeeting front corners. Side-plates all shallow. Pleon segment 3, postero-lateral corners acute, usually with sinus above. Eyes, when present, small, on front corners of head. Antenna 1 the longer, with -small accessory flagellum. Antenna 2 the stouter, and stouter in J than in ©. Upper lip unsymmetrically bilobed. Lower lip normal. Mandible normal, 34 joint of palp narrow, shorter than 24, Maxilla 1, inner plate small, with few setae, outer with 9 apical spines; 24 joint of Fi: ee | ln Din Unciola 677 palp long. Maxilla 2, inner plate with lateral fringe. Maxillipeds normal; outer plates broad, with rather strong spine-teeth. Gnathopod 1 much the stronger, differing to some extent in the 2 sexes, subchelate; the finger setose on outer margin. Gmnathopod 2 feebly or sometimes scarcely sub- chelate. Peraeopods 1—5 rather slender; 2° joint little expanded, finger with setules on inner margin. Pleopods with strongly serrate coupling spines on short, rather stout pedunele. Uropods 1 and 2 biramous, stout, with strong spines. Uropod 3 very short, with small outer ramus; the inner never articulated, but sometimes marked off from peduncle, at other times represented only by backward prolongation of peduncle. Telson lamellar, rounded. 8 species. Synopsis of species: ‘ Gnathopod 1 ind, 6th joint much longer than 1 Ne RR RL FIR 1. U, isticornis . .. . - 9.674 Gnathopod 1 ind, 6th joint not much longer than broad — 2. Antenna. 1, accessory flagellum with 4 or 5 joints — 8. Antenna 1, accessory flagellum with fewer than 4 joints — 5. Antenna 1, 8d joint not less than half as long 3 TE a a ER N 2. D.leucopis . . ; . - p- 678 Antenna 1, 34 joint less than half as ale as 24 — 4, ig le 8. DU. irrorata . . .».» p- 678 Eyes indistinet or wanting. . 2»... 4. U. crassipes . . - . p.679 Gnathopod 2, 5th joint much longer than 6th 5. U.planipes. ... - p- 679 | Gnathopod 2, 5th joint not much longer than 6th — 6. 6 Beam. Zaun een 6. U. erenatipalma . . p.680 Eyes wanting — 7. - | Uropod 3, inner process of pedunele acute 7. U. petalocera.. . . . p.681 Uropod 3, inner process of peduncle obtuse . 8. U.incerta . ... - p- 681 1. U. laticornis H. J. Hansen 1887 D.T!., H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p.166 1.6 1. 7—7b | 1889 D. I., J. Bonnier in: Bull. sei. France Belgique, v. 20 p- 388, 396 | 1894 U. 1.. G. O. Sars, Crust. Norway, v.1 p. 619 | 1893 U. irrorata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 338. oO unknown. — G. Head, rostrum rather short, lateral corners some- what produced, truncate. Pleon segment 3, postero-lateral angles acute, with sinus above. Eyes distinet, pale. Antenna 2, antepenultimate joint of peduncle much dilated, rather longer than broad, infero- -distally broadly rounded, not much produced; penultimate joint much dilated, scarcely twice as long as broad, proximally thick, distally much compressed. Gmnathopod 1, 24 joint short, not twice as long as broad, 6" much longer than 24, not remarkably broad at base, the basal process rather small, as broad as long, subacute, unarmed, a nearly straight margin between this and the finger-hinge being interrupted by a small tooth; finger reaching the basal process. Gnathopod 2, 5th joint scarcely longer than 6%, which is rectangular, not twice as long as broad; palm nearly transverse. Peraeopods long "and slender. Uropod 1, peduncle about 1'/, times as long as outer ramus; outer ramus rather longer than 678 Unsiola. inner, each armed with a few stout spines. Uropod 3, pedunele forming a rather broad, oblique plate; its hinder angle reaching beyond apex of telson, armed with a large spine and some setae; inner ramus in no way marked off from pedunele, outer attached at middle of outer side of peduncle, rather large, armed with a minute spine and some long setae. Telson as broad as long; apical margin much more curved than basal. L. 57 mm. Davis Strait (lat. 69° N., long. 58° W.). Depth 339 m. 2. U. leucopis (Kroyer) 1845 Glauconome 1., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.491 1.7 f.2a—e | 1846 @. 1., Kroyer in: Voy. Nord., Crust. t.19 f. la—u | 1894 Uneiola l., G. O. Sars, Crust. Norway, v.1 p.620 t.222 | 1896 U. 1., J. Bonnier in: Ann. Univ. Lyon, 0.26 p. 666 | 1862. U. l., U. leucopes, Bate, Cat. Amphip. Brit. Mus., p- 279 1.47 f.3 | 1880 U. irrorata. (part.), S. I. Smith in: Tr. Conneet. Aec., v.4 p. 280 | 1882 U. i., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p. 114 | 1887 U.i., H. J. Hansen in: Dijmphna Udb., p. 232 | 1887 U. i., H. J. Hansen in: Vid. Meddel., ser. 4 «.9 p. 164 t.6 £.5, 5a | 1889 D.:. (part.), J. Bonnier in: Bull. sei. France Belgique, v.20 p. 393 | 1893 D.i. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 338. Body rather strongly eonstrueted, peraeon segments transversely furrowed, pleon segments 1—3 each with rounded prominence on each side. Head, rostrum acute, rather long; front corners obtuse, rather prominent. Side- plates 1—4 subacute in front, 5% deeper than the rest. Pleon segment 3, postero-lateral corners acute with sinus above. Eyes represented by a small patch of opaque whitish pigment on each side. Antenna 1 nearly °/, as long as body; 24 joint rather longer than 1°, not twice as long as 34; flagellum rather shorter than pedunele, about 16-jointed; accessory flagellum 5-jointed. Antenna 2, antepenultimate joint of peduncle nearly as in U. peta- locera (p. 681), but penultimate joint not so widely expanded at base; ulti- mate joint nearly as long as penultimate; flagellum nearly half as long as pedunele, about 10-jointed. Gnathopod 1 nearly as in U. irrorata, except that in C' the palm is angularly prominent between 2 cavities. Gnathopod 2 rather feeble, densely setose; 6!" joint about as long as 5tk, narrowly oblong; palm very short, transverse. Peraeopods 3—5, 24 joint slightly expanded, densely setose. Uropods 1 and 2 rather stout; rami in each subequal, with strong apical spine. Uropod-3 very small; process of pedunele broad, narrowing gradually to apex tipped with 4 setae; inner ramus not marked off, outer very small, not nearly reaching end of process of peduncle, tipped with 4 setae. Telson roünd,. with setule on each side. Colour yellowish grey. L. 13 mm. Arctic Ocean (widely distributed, depth to 300 m; Varangerfjord [Norway], depth 170-226 m). 3. U. irrorata Say 1818 U. i., Say in: J. Ac. Philad., v. lu p.889 | 1840 D.i, H. Milne Edwards, Hist. nat. Crust., 3 p.69 | 1853 UT. i., Stimpson in: Smithson. Contr., ©.6 nr.5 p.45 | 1862 D.i., Bate, Cat. Amphip. Brit. Mus., p. 279 | 1873 D.i., (S.1 Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p. 840, 567 t.4 f.19 | 1880 U. i., S.I. Smith in: Tr. Conneet. Ac., ®. 4 p. 280 | ?1888 D.i., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1169 t. 138e | 1889 U.i. (part.), J. Bonnier in: Bull. sei. France Belgique, v.20 p.393 | 1898 U. i. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 838 t.55 £.37—4l. Body dorsally broad, flattened. Head, rostrum distinet, acute, lateral corners blunt, moderately prominent. Side-plates very shallow, 1° — 4 with front corner acute. Pleon segment 3, postero-lateral corners acute, with nd lm U u Unciola 679 - sinus above. Eyes small, rounded. Antenna 1 elongate, 24 joint longer than 1°, nearly thrice as long as 34; flagellum nearly as long as peduncle, in © attaining 23 joints; accessory flagellum with 5 joints, the last minute. Antenna 2 in S and 9 not distinguishable from those in U. petalocera (p. 681); flagellum in JS attaining 16 joints. Gnathopod 1, 24 joint very broad except at the base, 5!" joint short, broad, produced to a prominent tooth with irregular apex, 6!" very broad, especially in S, with basal process projecting beyond process of 5% joint, its blunt apex carrying a stout spine; the long oblique palm minutely erenulate throughout, with a very slight cavity at each end; finger reaching basal process of 6!" joint, teeth of inner margin not very conspicuous, setae of outer numerous and strong. Gnatho- pod 2, 5tk joint deeidedly longer than 64, both very setose, 6th narrowly oval or almost tapering, palm almost obsolete; finger very small. Peraeo- pods 1—5 slender; 24 joint very little expanded, rather more so in peraeo- pods 1 and 2 than in 3—5, setose in the latter. Uropods 1 and 2 not elongate, spines few but stout, especially the apical ones; rami nearly equal to one another, more than half as long as pedunele. Uropod 3, inner process of peduncle not very broad, with an oblique line distinetly defining it as representing the inner ramus, tipped with 2 or 3 setae; outer ramus longer than inner and produced beyond it, fringed with 7 setae. Telson rounded. Colour red or brown, mottled with white; antennae 1 and 2 annulated and gnathopod 1 marked with bright red (Smith). L. reaching 15 mm. North-Atlantie (North America from Labrador to New Jersey). Depth 0—800 m. 4. U. crassipes H. J. Hansen 1887 U. c., H. J. Hansen in: Vid. Meddel., ser. 4 v.9 p. 165 t.6 f.6,6a | 1896 U. c., J. Bonnier in: Ann. Univ. Lyon, v.26 p. 667 | 1893 U. irrorata (part.). A. Della Valle in: F. Fl. Neapel, «.20 p. 338. O unknown. — G. Head, rostrum rather long; front corners truncate, rather prominent. Side-plate 1 acute in front. Pleon segment 3, postero- lateral corners with a rather small acute but not produced point, without conspicuous sinus between it and the bulging hind margin. Eyes perhaps wanting. Antenna 1, 24 joint thrice as long as 34; accessory flagellum (in figure) 4- or 5-jointed. Antenna 2, antepenultimate and penultimate joints of peduncle scarcely so stout as in U. leucopis, somewhat compressed. Gnatho- pods 1 and 2 seemingly as in U. leucopis. Uropod 1, peduncle about */,, longer than the rami, which have stout spines. Uropod 3, inner process of pedunele, though not separated from the base by an articulating membrane, indicating a small inner ramus, tipped with 2 spinules; outer ramus broader and much longer than inner and reaching beyond it, with a spinule and some setae. Telson shortly oval. L. nearly 9 mm. Baffın Bay (lat. 71° N., long. 59° W.). Depth 376 m. 5. U. planipes Norm. 1867 U, p., A. M. Norman in: Nat. Hist. Tr. Northumb,., v1 p.14 t.7 £.9—13 | 1893 U.p., A. Della Valle in: F. Fl. Neapel, v.20 p. 341 t.55 f.42—45 | 1894 U.p., G.O. Sars, Crust. Norway. v.1. p. 621 t.223 | 1868 D. leucopes (err., non Glauconome leucopis Kroyer 1845!), Bate & Westwood, Brit. sess. Crust., v.2 p- 518 | 1871 Glauconome kröyeri + @. steenstrupi, A. Boeck in: Forh. Selsk. Christian., 1870 p. 259, 260 | 1876 @. k.+G. s., A. Boeck, Skand. Arkt. Amphip., v.2 p. 639 t.30 f.1; p: 640. f Body slender, dorsally smooth; peraeon segment 2 in S with long 'ventral spine. Head, rostrum distinet, rather flattened. lateral corners angular, little prominent. Side-plate 1 produced acutely forward, 24 deeper than 680 Uneiola the rest, subacute in front in S, not in Q. Pleon segment 3, postero-lateral corners acute, with sinus above. Eyes represented only by an irregular patch of whitish pigment on each side. Antenna 1 long and slender, 24 joint longer than 1°, nearly thrice as long as 34, flagellum subequal to peduncle, 14-jointed, accessory flagellum with 2 joints, 24 minute. Antenna 2 in d, antepenultimate joint of pedunele thick, lower distal end round, slightly produced, penultimate also thick, ultimate not very slender; in Q these joints are much more slender; flagellum as long as ultimate joint of pedunele in Q, shorter in C, 6-jointed. Gnathopod 1 in 9, 5! joint as broad as long, 6! moderately stout, hind margin not extremely short; palm defined by an obtuse angle against which the apex of elosed finger impinges, leaving 2 palmar cavities. Gmnathopod 1 in Q, 24, 5tk and 6'k joints less broad than in JS, with the palm oblique but nearly straight. Gnathopod 2 slender, stouter in d than in Q; 5th joint large, much longer than 6th, densely setose on hind margin, 6% tapering distally, without palm; finger very small. Peraeopods 1—5 very slender. Peraeopods 3—5, 2° joint narrow, not setose. Branchial vesicles very small. Uropods 1 and 2 not very robust, spinose. Uropod 3, laminar inner process of peduncle rather narrow, armed with a single spine; inner ramus not indicated, outer produced beyond process of peduncle, sublinear, with 5 long apical setae and 1 seta on outer margin. Telson subrotund, with 2 spinules on each side. Colour pale yellow, banded with light orange; whitish patches along the sides. L. 9:5, S 6 mm. Arctic Ocean, North-Atlantie, North-Sea and Skagerrak (Norway from Christiania- fjord to Vadsö, depth 94-564 m; Greenland, depth 90 m; British Isles); Kattegat. 6. U. erenatipalma (Bate) 1855 U. irrorata (err., non Say 1818!), Gosse in: Ann. nat. Hist., ser.2 v. 16 p.307 | 1862 Dryope i., Driope i. + Dryope crenatipalma, Driope c., Bate, Cat. Amphip. Brit. Mus., p. 276 t. 47 £.1; p. 277 t.47 f.2 , 1863 Dryope i.+ D. crenatipalmata, Bate & Westwood, Brit. sess. Crust., v.1 p. 488 £.; p. 490 f. | 1874 D. crenatipalma, T. Stebbing in: Rep. Devonsh. Ass., v.6 p.770 | 1889 Umnciola crenatipalmata, J. Bonnier in: Bull. sei. France Belgique, v.20 p.392 t.12, 13 | 1893 U. c., Chevreux & E. L. Bouvierin: Ann. Sei. nat., ser.7 v.15 p.138 t.2 f£.12 | 1898 U. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 340 t. 55 f. 32—36 | 1896 U. c., J Bonnier in: Ann. Univ. Lyon, v.26 p. 666. Body rather broad, depressed. Head, rostrum short, acute; lateral corners with inner point acute. Side-plates 1 and 2 with front corner acute. Pleon _ segment 3, postero-lateral corners acute, with sinus above. Eyes small, rounded, remaining dark in spirit. Antenna 1, 24 joint rather longer than 1°, less or not more than twice as long as 34; flagellum shorter than peduncle, 11-jointed; accessory flagellum with 2 joints, 24 minute. Antenna 2, ante- penultimate .and penultimate joints of peduncle in J stout but not laminar, ultimate nearly as long as penultimate, flagellum as long as ultimate, 9-jointed. Gnathopod 1, 24 joint broad except at base, 5t® short, broad, produced into a blunt setose process, 6!" broad, produced into a blunt basal process reaching beyond process of 5% joint; the long oblique palm in JS forming 3 cavities, in Q convex between 2 very shallow cavities, in both sexes minutely erenulate; finger meeting basal process, its inner margin dentieulate, outer with several setae. Gmathopod 2 rather feeble; 5th joint rather shorter than 6t%, which is rectangular, having in S an almost transverse, slightly convex palm, over which the small finger eloses tightly, while in Q the palm is deeply excavate, the closed finger leaving a conspieuous gap. Peraeopods 1—5 nearly as in U. irrorata (P- 678). Uropods 1 and 2, rami somewhat unequal. Uropod 3 very small, inner process of pedunele tipped with a spine and Er“ Uneiola, Siphonoecetes 681 seta and indicated as the inner ramus by a constriction on each side, but without line of demareation; outer ramus tipped with setae, broader than long, reaching apex of inner; or (Chevreux & Bouvier) about as broad as long, reaching apex of the inner. Telson röund. L. about 8 mm. North-Atlantie with adjoiping seas (England, France, Spain). - 7, U. petalocera (0. Sars) 1876 Glauconome planipes? (err., non Uneiola p., A.M. Norman 1867!), G. O. Sars in: Arch. Naturv. Kristian., v.2 p. 360 | 1879 @. peta- locera, G. O. Sars in: Arch. Naturv. Kristian., v.4 p.462 | 1885 Unciola p., G. O. Sars in: Norske Nordhavs-Exp., v.6 Orust. I p. 212 t.17 f.5a—l | 1889 U. p., J. Bonnier in: Bull. sei. France Belgique, v.20 p. 396 | 1894 U. p., G. O. Sars, Crust. Norway, v. 1 p.619 | 1893 U. irrorata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 338. Body slender and in general much resembling U. planipes (p.679). Head truncate in front, without distinet rostrum, lateral corners acute. Side-plates 1-4, front corner acute, and in side-plate 1 prolonged. Pleon segment 3, postero-lateral corners acute, rather strongly produced. Eyes not visible. An- tenna 1 slender, elongate, 24 joint longer than 1°, and fully thrice as long as 34, flagellum about as long as pedunele, 20-jointed, accessory flagellum 2-jointed. Antenna 2 in J, antepenultimate joint of peduncle greatly expanded (in oO not), lower distal end rounded and rather strongly produced, penultimate strongly expanded, lamellate, narrowing distally; flagellum a little longer than ultimate joint of pedunele, with 9 joints (or in figure of S about 16).- Gnathopod 1 in C, 6% joint very broad and strongly compressed, with 2 deep cavities in the palm, which is defined by an obtuse angle; finger remarkably long, faleiform, its apex nearly reaching the 4" joint. Gnatho- pod 1 in ©, 6** joint piriform; palm faintly ineurved, very oblique, indistinetly defined from the short hind margin; finger elosing between 2 sets of palmar spines. Gnathopod 2 rather feeble, setose, 5tk joint a little shorter than 6, which is subrectangular, palm nearly transverse; finger small. Peraeo- pods 1—5 slender, 1t:—34 subequal, 4" and 5tk considerably longer. Peraeo- pods 3—5, 24 joint linear, not setose. Uropods 1 and 2 nearly as in U. planipes. Uropod 3, pedunele produced within to a pointed lobe, carrying a single spine; inner ramus not indicated, outer narrowly oval, produced beyond inner process of peduncle, fringed with setules. Telson semi-elliptical, with 2 short apical bristles. Colour whitish. L. 10 mm. North-Atlantie (lat. 68—75° N.). Depth 658—1237 m. 8. U.incerta Bonnier 1896 U. i., J. Bonnier in: Ann. Univ. Lyon, v.26 p. 666 t.40 £.4. Oo. Resembling in general U. erenatipalma. Eyes wanting. Antennal, 15 joint of peduncle armed below with double row of spinules, 24 not quite twice as long as 34; accessory flagellum with 3 joints, 1° and 2d equal, 34 nodiform. Uropod 3, peduncle broadly produced ön inner side, armed at apex with a spine and 2 setae; inner ramus not indicated, outer small, not reaching end of process of peduncle, apex truncate, armed with 2 spines and 8 setae. L. about 5 mm. — J unknown. Bay of Biscay. Depth 180 m. 10. Gen. Siphonoecetes Kıayer 1845 Siphonoecetes (Sp. un.: $, typieus), Kroyer in: Naturh. Tidsskr.. ser. 2 v.1 p 481, 491 | 1876 S., A. Boeck, Skand. Arkt. Amphip., v.2 p.630 | 1888 S., T. Stebbing in: Rep. Voy. Challenger, v.29 p.212 | 1893 S., A. Della Valle in: F. Fl. Neapel, v.20 p- 357 | 1894 $., G. O. Sars, Crust. Norway, v.1 p.609 | 1857 Siphonocetus, Bate in: 682 Siphonoecetes Ann. nat. Hist., ser.2 v.19 p.149 | 1862 Siphonoecetes (Siphonaecetus), Bate & Westwood, Brit. sess. Crust., v.1 p. 463, 467 | 1862 Siphonoecetus (part.), Bate, Cat. Amphip. Brit. Mus., p.268 | 1871 $., A. Boeek in: Forh. Selsk. Christian., 1870 p.257 | 1873 Siphono- coetus, A. Marschall, Nomenel. zool:, p. 420 | 1887 Siphonaecetes, Chevreux in: Bull. Soe. zool. France, v.12 p. 290, 317. Body slender, peraeon much longer than pleon. Head subquadrate. Side-plates very shallow, setulose, 1° subacute in front, 5tk, 6tk much produced backward. Eyes, when present, placed on front corners of head. Antennae 1 and 2 setose. Antenna 1, pedunele much longer than flagellum, its 3 joints subequal, without aecessory flagellum. Antenna 2 much longer, stouter; flagellum short, of 1 long and 2 short joints, with unguiform spines at apex. Upper lip rounded or faintly bilobed. Lower lip with the mandibular processes narrow. Mandible with palp of 1 setose joint, molar with accessory plate, otherwise normal. Maxilla 1, inner plate obsolete, outer with 7 apical spines; palp long, with 6 spines on apex of 24 joint and some setae on outer margin. Maxilla 2, inner plate fringed on inner margin. Maxillipeds normal; last joint of palp very small, tipped with spines. Gnathopod 1 without distinet palm. Gmathopod 2 stronger, distinetly subchelate. Peraeo- pods 1 and 2, 24 joint strongly expanded, glandular, 4 joint broad, cordi- form, 5!" minute; finger long, straight. Peraeopods 3 and 4, 24 and 41% joints not much expanded, 5'% short, broad, distally scabrous; finger reverted, bidentate. Peraeopod 5 normal; 24 joint not broad, densely setose, finger as in peraeopods 3 and 4. Branchial vesicles and marsupial plates narrow. Pleopods 1—3, peduncle very broadly expanded; the 2 coupling spines very slender, with 3 or 4 teeth on each side; 1° joint of inner ramus with smoothly concave inner margin. Uropod 1, peduncle longer than outer ramus, each spinulose on outer margin; inner ramus Shorter than outer, spinulose on inner margin. Uropod 2 similar to uropod 1, but smaller. Uropod 3 short, pedunele broadiy produced on inner side; ramus very small, tipped with setae. Telson broader than long, apically rounded, 2 small patches of microscopie spinules flanking the apex. Occupying tubes, constructed or adapted. 5 accepted species, 1 obscure. Synopsis of accepted species: Eyes not well developed -—— 2. 4 Eyes well developed — 8. Antenna 1, flagellum less than half as long as 9 Dedunole ER RER NEE TE HE RER 1.8 (ypieis. : 5, .% p. 682 Antenna 1, flagellum more than half as long as BEER a a rare en 2.8. pallidus . . » . . p: 683 Uropod 3, ramus möre than half as long as DPRRBEIE A 2 sl we ee 8. 8, colletli. . : ..» . p 683 Uropod 3, ramus not more than half as long as peduncle — 4. A Uropods 1 and 2, rami stout and strongly spined 4. S. dellavallei . . . . p. 684 Uropods 1 and 2, rami slight and not strongly 5 BDIDOH: ae na en En 5. 8. sabatieri. - . . - p- 684 1. S.typicus Kroyer 1845 $.t., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.481 t.7 f.4a—f | 1846 S, t., Kroyer in: Voy. Nord, Crust. t.20 f. la—v | 1893 8. t. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 358. Body eylindrie but ventrally flattened; peraeon about °/, of total length. Head, rostrum and front angles not very prominent. Side-plate 5 Siphonoeecetes 683 about thricee as broad as deep, outdrawn behind into a very long point. Eyes not visible. Antenna 1 about half as long as body; joints of pedunele successively a little shorter, together more than thrice as long as flagellum, which is 4—6-jointed. Antenna 2 nearly as long as body, nearly twice as long as antenna 1, ultimate joint of pedunele shorter than penultimate, a little longer than antepenultimate; flagellum shorter than ultimate joint of pedunele, with 1 long and 2 very short joints, last broader than long, tipped with 2 diver- gent spines. Antennae 1 and 2 very setose. Gmathopod 1, 5tk joint a little longer and distally much broader than the conical 6", which has strong spines on hind margin; finger about half as long as 6% joint, with 7 or 8 serrations on inner märgin, and with a tuberele near the apex. Gmathopod 2 slightly shorter but far stouter than gnathopod 1, 24 joint °/, as broad as long, 4 produced with blunt apex, 5th cup-shaped, its narrow lobe tipped with a strong spine looking like a eontinuation of the lobe, 6! oval, hind margin much more convex than front, with 7 large spines on it successively larger to the palm, which is shorter and has 2 sharp tubercles; finger curved, acute, with about 10 teeth, and near the apex a tubercle and 2 long setae. Peraeopods 1 and 2 not differing from those of S. colletti. Uropod 3, peduncle broadly produced on inner side, ramus scarcely produced beyond it, oval or somewhat conical, with 12 strong setae. Telson much broader than long, bare. Colour pale yellow, marbled with brown. L. 6 mm. Arctie Ocean (Greenland). Depth 30—35 m. 2.8, pallidus OÖ. Sars 1882 $.p., G. O. Sars in: Forh. Selsk. Christian., nr. 18 p- 113 t.6 $.7a—d, 7x | 1894 S.»., G. O. Sars, Crust. Norway, v.1 p.611 t.218 £.2| 1893 S. typieus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 858. Head, rostrum small; lateral corners extremely narrow, not widened apically. Eyes replaced on each side by a small patch of an opaque whitish pigment. Antenna 1 not reaching end of penultimate joint of peduncle of antenna 2; joints of peduncle successively shorter; flagellum about half as long as peduncle, with 7 joints. last minute. Antenna 2 nearly as long as body, ultimate joint of pedunele shorter than penultimate. Gnathopod 1, 6tb joint much narrower than 5! and scarcely tapering distally. Gmathopod 2, 6'ı joint armed with 5 spines on hind margin. Uropod 3, inner expansion ‘of peduncle comparatively narrow, ramus very small, not reaching beyond expansion of peduncle. Colour pale yellowish. L. about 4 mm. Arctie Ocean and North-Atlantie (West-Norway up to Hasvig [Finmark]). Depth 94—282 m. Usually in shells of Dentalium. | 2 | | 3. 8. colletti Boeek 1862 S. typicus (err., non Kroyer 1845!), Bate & Westwood, Brit. sess. Crust., v. 1 p. 465 f. | 18953 S. £. (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p- 358 | 1871 S. eolletti, A. Boeck in: Forh. Selsk. Christian., 1870 p. 258 | 1876 8. e., A. Boeck, Skand. Arkt. Amphip., %.2 p.633 t.28 f.9 | 1894 S. c. (S. mucronatus Aug. Metzger in MS.), G. ©. Sars, Crust. Norway, o.1 p. 610 t.218 £.1.| 1871 S. cuspidatus, Aug. Metzger in: Jahresber. Ges. Hannover, v.21 p.30 | 1873 S. ce. (sp. norv.!), (8. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p. 501. 566. Head, rostrum acute (Sars: short, triangular; Smith: long, slender); lateral lobes much produced, apically swollen, carrying the well developed, rounded, dark eyes. Antenna 1 considerably exceeding half length of body, reaching beyond penultimate joint of peduncle of antenna 2 (Sars), about to middle of that joint (Smith); 3 joints of pedunele subequal; flagellum deeidedly (Sars)*or scarcely (Smith) longer than a joint of peduncle, 5--7=jointed. 684 Siphonoecetes Antenna 2 about as long as body, ultimate and penultimate joints of peduncle subequal or ultimate the shorter; flagellum shorter than ultimate joint of peduncle, with 3 joints, the last 2 very small. Gnathopod 1, 6** joint about as long..as St, conically tapering, hind margin armed with 3 strong spines. Gnathopod 2 rather strong; 24 joint rather short and thick, 4 produced to obtuse setose prominence, 5t" having on its narrow lobe a stout spine and several setae, 6tk large, oblong oval, hind margin armed with 6 spines, larger as they approach the short, not very oblique palm. Gmnathopods 1 and 2 vf the very same structure in the two sexes (Sars), gnathopod 2 in Q more slender than in the J (Smith). Peraeopods 1 and 2, 4 joint very large and expanded, nearly cordiform in outline. Uropod 1 (in figure), peduncle spinose on outer, not on distal margin, outer ramus °/, as long as peduncle, with 11 spines on straight outer margin, inner ramus much shorter. Uropod 2 with a spine-fringed, distal lobe, outer ramus not much shorter than peduncle, fringed with spines on outer margin. Uropod 3, pedunele expanded inside to a broad setiferous lobe; ramus more than half as long as peduncle, obliquely truncate apex with 1 spine and 7 setae. Colour greyish white, varied with yellowish brown, antenna 2 with yellow and brown bands. L. 4—8 mm. North-Atlantie, North-Sea and Skagerrak (South- and West-Norway, depth 11-37 m; Shetland Isles, depth 73-—-164 m; Firth of Forth; Vineyard Sound and Buzzard Bay); Köttogat. 4. S. dellavallei Stebb. 1893 $. typicus (part.), A. Della Valle in: F. Pl. Neapel, %.20 p.358 t.4 f.11—13, t.7 f.23—28 | 1899 8. dellavallei, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 241, 350. Differs from S. pallidus (p. 683) in having a well developed acute rostrum and the eyes well developed, dark in spirit, but conspicuous from their abundant. white pigment.. Antenna 1 scarcely reaching ultimate joint of pedunele of antenna 2; flagellum less than half as long as pedunele, with 5 joints, the last minute. Antenna 2, ultimate joint of peduncle shorter than penultimate. Side-plate 1 rather blunt- in front. Appendages in general little different from those of S. pallidus. Colour yellowish white with patches of brown, antennae annulate with white and brown. L. 5—6 mm. Constructing free tubes. Bay of Naples. Depth 10—20 m, on fine sand. 5. S.sabatieri Rouv. 1894 8.s., Rouville in: C.-R. Ass. France, Sess.23 v.1.p. „173. In general agreement with S. colletti (p. 683), except as to uropods 1—3. Uropod 1, pedunele much longer than rami, not obviously spinose on outer margin, but closely fringed with spines on distal border; outer ramus not much longer than inner, with 6 or 7 spines along cönvex outer margin. Uropod 2, peduncle as in uropod 1; rami slender, outer rather the longer, about half as long as peduncle; both rami smooth except for 2 apical spines. Uropod 3, peduncle expanded on inner side to a narrow setiferous lobe; ramus not half as long as peduncle, little more than a eylindrical tuberele, tipped with a couple .of setae. In peraeopods 1 and 2 the 24 joint is very largely expanded, and in peraeopods 3 and 4 the bulbous 5*" joint appears to be scabrous all over. L. slightly under 4 mm. Gulf of Lion (Etang de Thau). In small univalve shells. S. kröyeranus (Bate) 1857 Siphonocetus k., Bate in: Ann. nat. Hist., ser. 2 v.19 p.149 | 1862 Siphonoecetes whitei (err., non Cerapus w. Gosse 1853!), Bate &Westwood, Brit. sess. Crust., v.1 p.467 f. | 1862 Siphonoecetus w., Bate, Cat. Amphip. Brit. Mus., p. 270 t.45 £.10. English Channel (Weymouth). 2, 2 Me NE a Corophium 685 1l. Gen. Corophium Latr. 3 ?1793 Cymothoa (part.), J. ©. Fabrieius, Ent. syst., v.2 p.503 | 1806 Corophium (Sp. un.: CO. longicorne), Latreille, Gen. Crust. Ins., v.1 p.58 | 1888 C., T. Stebbing in: Rep. Voy. Callenger, v.29 p.79, 1670 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p-362 | 1894 C., G. O. Sars, Crust. Norway, v.1 p.612 | 1895 C., G. O. Sars in: Bull. Ace. St.-Pötersb., ser. 5 v.3 p.291 | 1813/14 C., Corophrium, Leach in: Edinb. Ene., v.7 p.432 | 1830 Corophia, H. Milne Edwards in: Ann. Sei. nat., v.20 p.384 | 1851 Audouinia (nom. nud.), (A. Costa in:) F. W. Hope, Cat. Crost. Ital., p. 24. Body depressed throughout. Head with narrow lateral lobes. Side- plates small, discontinuous, 1° conieally produced, tipped with setae. Eyes small or imperfectly developed, on lateral lobes of head. Antenna 1 without accessory flagellum; flagellum slender, with several joints. Antenna 2 (Fig. 116, 117p.691) strong, pediform, usually much longer in C than in 9; flagellum short, 3-jointed, with apical hooked spines. Upper lip broad. Lower lip normal. Mandible with 2-jointed palp, slender, each joint carrying a strong plumose seta; other parts normal. Maxilla 1, inner plate nearly obsolete, outer with 7 spines on apical margin, 24 joint of palp long. Maxilla 2, inner plate fringed on inner margin. Maxillipeds, inner plates narrow, without apical spine-teeth, outer long, narrow, with slender spines on inner margin; finger of palp small, with apical spine. Gnathopod 1 slender, the short projeeting 39 joint and long 5!" densely fringed with long setae; 6'k joint narrow, with short palm. Gmnathopod 2 rather larger, 4" joint closely atta- ched to hind margin of 5t%; its own convex hind margin fringed with very long plumose setae in 2 rows; 6!" joint sublinear, without palm. Peraeo- pods 1 and 2, 24 and 4 joints somewhat expanded, 5'% very short; finger slender. Peraeopods 3 and 4, 2° joint moderately expanded, 4th produced in front of the short 5, which carries 2 oblique rows of spines, 6! slender, not long; finger short, reverted. Peraeopod 5 long and slender, 24 joint fringed on both margins with long setae. No branchial vesicles on gnathopod 2. Marsupial plates narrow. Pleopods 1—3, peduncle greatly expanded on inner side; the 2 coupling spines with several teeth; inner ramus the longer, without left spines on 1° joint. Uropods 1 and 2, rami rather short, with strong spines on outer margin. Uropod 3, peduncie short, ramus single, laminar, with some fringing setae. Telson entire, small, distinet (Fig. 115,118, p. 686, 691). 12 species accepted, 7 obscure. Synopsis of accepted species: Pleon segments 4—6 distinet — 2. Pleon segments 4—6 coalesced — 11. 9 Uropod 3, ramus oval — 8. u Uropod 3, ramus parallel-sided — 6. 3 | Antenna 2 not chelate — 4. Antenna 2 chelate — 5. \ A zaman obkaselw Damtad. » see 1. C. volutator. . . p. 686 Telson transversely truneate. . . ....... 2. C.nobile . . . . p.687 5 Pleon segments 4—6 smooth . . ... 2... 3. C. chelicorne . . p. 687 Pleon segments 4—6 spinulose . .» ...... 4. C.spinulosum . p.688 6 Uropod 3, ramus linear — 7. Uropod 3, ramus not linear — 8. - { Antenna 1 ind, 1st joint without process . .‘. 5. C.affine . . . . p.688 Antenna 1 in, 1st joint with hooked process . 6. C. runeicorne. . p.689 686 Corophium Antenna 2, ultimate joint of peduncle apically prodnesdi.: 22 KETTE REN 7. C.robustum . . p. 689 Antenna 2, ultimate joint of peduncle not apically produced — 2. Peraeopod 5, joints 4—6 broad . . » 2.2... 8. C. mucronatum . p. 689 9 N Peraeopod 5, joints 4—6 narrow — 10, | Antenna 2, penultimate joint of peduncle with inner tooth to apical process. . » » 2.2... 9.C 10 Antenna 2, penultimate joint of pedunele without inner tooth to apical process. ». ». 2... 10. ©. monodon. . . p. 690 Antenna 2 in 9, penultimate joint of peduncle 1 DES WERE Ba ee A RE 11. cC Antenna 2 in 2, penultimate joint of peduncle DOR ABB 12. ©. bonellii . . . p.691 1. C. volutator (Pall) 1710 „Pulex marinus cornutus“, Jo. Ray, Hist. Ins., p.43 | ?1761 Oniscus bicaudatus, Linns, Fauna Svec., ed.2 p.500 | ?1793 Cymothoa bicaudata, J. ©. Fabrieius, Ent. syst., .2 p.507 | 1898 Corophium bicaudatum, A. Della Valle in: F. Fl. Neapel, v.20 p.372 t.56 f.2—6 | 1766 Oniscus volutator, Pallas, Misc. zool., p.192 t.14 f.20 | 1888 Corophium v., 'T. Stebbing in: Rep. Voy. Challenger, v.29 p-21, 29, 34 | 1893 C. v., Chevreux & E. L. Bouvier in: Ann. Sei. nat., ser.7 v.15 p.140 | 1767 Cancer grossipes, Linn, Syst. Nat., ed. 12 «2 p.1055 | 1777 Gammarus g.,.J. ©. Fabricius, Gen. Ins., p. 248 | 1856 Corophium g., R. Templeton in: Mag. nat. Hist., v.9 p.12 | 1876 C.g., A. Boeck, Skand. Arkt. Amphip.,' v.2 p.623 t.28 f.6 | 1894 C. g., G. ©. Sars, Crust. Norway, v.1l p.614 t.219 | 1896 ©. g., Sowinski in: Mö&m. Soc. Kiew, v.15 p.873 (distribution) | 1777 Astacus linearis, Pennant, Brit. Zool., ed.4 0.4 p.17 t.16 f.831 | 1779 Gammarus longicornis, J. C. Fabricius. Reise Norweg., p:258 | 1793 @. 1, J. ©. Fabrieius, Ent. syst., v.2 p.515 | 1806 Corophium longiecorne, Latreille, Gen. Orust. Ins., v.1 p.59 | ?1874 (©. bonelli, Ritzema Bos, Bijdr. Crust. Hedriophthal., p. 54. Body moderately slender, pleon segments 4—6 distinet. Head, rostrum small; lateral lobes narrowly rounded, not very prominent. Side-plate 1 with about 5 setae on produced apex. Eyes very gmall, dark. Antenna 1 in J nearly half, in Q little more than ’/, as long as body; 1° joint longer than 22 and 39 combined, in C serrulate below, in @ with 2 stout spines; flagellum . erassicorne . p. 690 nearly as long as pedunele, 12—14-jointed. Antenna 2 in JS as long as body; penultimate joint of peduncle stout and long, lower-margin produced to a short tooth bounding an apical sinus; ultimate joint much narrower, nearly as long, without any tooth, much longer than the 3-jointed flagellum. Antenna 2 in © about half as long as body, except for shortening of ultimate and penultimate joints of peduncle, constructed as ind. Gnatho- - Uropod a Pod 1, 5% joint rather longer than 6"; 6th widening a little distally; palm nearly FERREE ER transverse and matching finger. Gnathopod 2, Tach. een tells 5th joint rather shorter than 6%"; finger rather [After G. O. Sars.] long, perfectly smooth. Peraeopods 1 and 2, finger scarcely longer than 6th joint. Peraeo- pods 3 and 4, 4tk joint’ setose on both margins. Peraeopod 5, 24 joint oval,‘ well expanded. Uropod 3, pedunele broader than the rounded oval, setose, ramus. (Fig. 115). Telson almost an equilateral triangle, with obtusely pointed apex. Colour whitish, marbled with brown on back and antenna 2. L. 6 mm. North-Atlantie with adjoining seas (Europe from West-Norway to the Adriatie). Forming tubular galleries in the mud of tidal swamps. . eurvispinum . p-690 _ Aura da FAN er. 2 en LU LUD LU u zu Corophium 687 2. C.nobile O. Sars 1895 C.n., G.O.Sars in: Bull. Ace. St.-Petersb., ser.5 v.3 p-292 t.20, 21 | 1896 ©. n., Sowinski in: Möm, Soc. Kiew, vo. 15 p. 375. Segments of pleon distinet. Head with short broad triangular rostrum. Side-plate 1 the largest, produced forward to a narrowly rounded lobe, carrying many setae, some of them plumose. Eyes small, rounded, dark; visual elements seeming to be imperfectly developed. Antenna 1 very slender, in d more than half as long as body, rather longer than in 9 ; peduncle setose, densely in J; 1° joint not quite so long as 24 and 34 combined, with 2 teeth on lower margin; 34 joint scarcely more than half as long as 24; flagellum with about 20 joints, filiform, in Q subequal to pedunele, in S longer. Antenna 2 subpediform, in J more than °®/, as long as body, much smaller in 9; first 2 joints eoalesced, as long as 34; penultimate joint of pedunele large, tumid in C, in both sexes produced into 2 strong teeth, the outer the longer; ultimate joint sublinear, much shorter than penultimate, a somewhat recurved tooth of its lower margin adapted to pass between the 2 apical teeth of the penultimate; flagellum not quite as long as ultimate joint of peduncle, setose, with 1 long and 2 very short joints, the last tipped with 2 curved spines. Upper lip somewhat quadrate with dentiform projection from surface. Gnathopods 1 and 2 as in C. volutator. Peraeopods 1 and 2 comparatively slender; 24 joint slightly expanded, 4" subequal to 5" and 6% combined, its front margin in J fringed with long diverging setae, 6% very narrow, conically tapering, finger subequal to it, slender, acute. Peraeopod 3, 24 joint narrowly oval, hind margin straight, almost smooth, 4!" with front apex produced, 5!k with 2 oblique rows of curved spines on the outer side, the lower row of 6 ending at the produced hind corner; 6% joint longer, linear; finger short, curved. Peraeopod 4 similar, but with longer joints and hind margin of 24 curved, fringed with plumose setae. Peraeopod 5 much longer, more than half as long as body; 24 joint broadly oval, narrowest distally, densely setose, 4—6tl linear, 6!" the longest; finger short, curved, acute. Uropods 1—3 as in C. volutator. Telson transversely truncate. Colour, dark brown in bands or mottled; antenna 2 obliquely banded. "L. 9 10, d 11mm. Caspian Sea. Depth to about 75 m. 3. ©. chelicorne O.Sars 1895 C.c., G.O.Sars in: Bull. Ac. St.-Petersb., ser.5 0.3 p.299 t. 22. Pleon segments distinet, division between 5t® and 6tk rather obscure. Head, front. convex, without rostrum. Side-plate 1 with only 3 slender setae at apex, Eyes very small, rounded, dark. Antenna 1 rather short, in Q only about '/, as long as body, sparingly setose; 1° joint as long as 24 and 39 combined, witlı about 7 spinules on lower margin in Q, not in Cd; 24 joint more than twice as long as-34 in C, notin O ; flagellum shorter than pedunele, with 15 joints ind, 10 in ©. Antenna 2 strong, in C ?/, as long as body; the large penultimate joint of peduncle with small inner tooth at apex, and an outer tooth produced to the end of ultimate joint, which is only about half as long as penultimate and has a short stout recurved prominence below middle of lower margin and a strong apical tooth, eapable of erossing the chela-forming tooth of penultimate; flagellum 3-jointed, subequal to ultimate joint of peduncle. Gnathopods 1 and 2 as in Ü. volutator. Peraeo- pods 1 and 2, 4 joint rather longer than 5t and 6th eombined, Stk very short, 6% not quite linear, finger rather shorter. Peraeopods 3 and 4 as in C. nobile. Peraeopod 5, 6! joint nearly twice as long as 5tt, Uropods 688 Corophium as in €. nobile (p. 687), except that rami of uropods 1 and 2 are without spines on inner margin. Telson and colour as in C.nobile. L. 9 7, d 8 mm. Caspian Sea. Depth 10—80 m. 4. C.spinulosum O0. Sars 1896 C. s.,, G. O. Sars in: Bull. Ac. St.-Pöätersb., ser.5 v.4 p. 481 t.12 £. 18—25. Segments of pleon distinet, 4--6th with spinules along hind margin, 4th and 5th with lateral spinules. Head with frontal margin only slightly convex.‘ Side-plate 1 with 4 apical setae and several setules. Eyes very small, rounded. Antenna 1 slender, sparsely setose, in Q nearly half as long as body; 1° joint about as long as 24, with 2 spines on lower margin; flagellum rather longer than peduncle, about 14-jointed. Antenna 2 in JG, penultimate joint of pedunele with large process, broad at base, with small dentiele on its inner side, its acute apex chelately crossing the small apical tooth of the ultimate; in © process of penultimate joint much smaller, reaching about to middle of ultimate, which is almost simply eylindrie; flagellum rather shorter than ultimate joint of peduncle. Gnathopod 2, finger smooth, with only a few slender hairs. Peraeopods 1 and 2, 4! joint slightly expanded, not very setose; finger very long and slender, rather longer than 6tk joint. Peraeopod 5, 24 joint densely setose, the slender terminal joints having spinules as well as setae. Uropods 1 and 2 with numerous spines on both margins of pedunele and rami. Uropod 3, the ramus armed with spines as well as setae. Telson ending obtusely (in figure), distinguished by a rather «onspieuous erect spine on each side of its base. L. © 95 mm. Caspian Sea. Depth 45 m. 5. C. affine Bruz. 1859 C.a., R. M. Bruzelius in: Svenska Ak. Handl., n. ser. v.8 nr.1 p.16 | 1876 ©. a., A. Boeck, Skand. Arkt. Amphip., v.2 p.629 t.28 f.7 | 1893 C.a., A. Della Valle in: F. Fl. Neapel, v.20 p.371 t.55 f.60 | 1894 C.a., G. O. Sars, Crust. Norway, v.1 p.618 t.221 f.2 | ?1898 C.a., Sowinski in: M&m. Soc. Kiew, v.15 p. 457 | 1869 C. tenwicorne (2), A. M.Norman in: Rep. Brit. Ass., Meet. 38 p. 286. Body rather slender, pleon segments 4—6 distinet. Head without distinst rostrum; lateral lobes prominent, acute. Eyes represented by a small patch of opaque white pigment on each side. Antenna 1 rather long and slender; 1° joint narrowing distally, with 6 recurved spines at base, and 4 slender spines below, 24 very slender, scarcely shorter than 1°%; flagellum less than half as long as peduncle, 6-jointed. Antenna 2 in J about °/, as long as body; penultimate joint of pedunele very large, distal tooth quite small, inner tooth a small tuberele; ultimate joint not nearly half as long, narrow, with sinuous lower margin, produced distally in a tooth-like process; 1° joint of flagellum with distal nodiform projection. Antenna 2 in O rather feeble, not longer than antenna 1; glandular-process at base very long; antepenultimate joint of pedunele with single spine, penultimate simply eylindrical with 3 slender spines, ultimate more than half as long, with 4 spines distributed. Gnathopod 1, 6 joint very narrow, not at all widened distally; finger denticulate, with prominent subapical tooth. Gnathopod 2 as in (. erassicorne (p. 690); finger with denticle near apex. Peraeopods 1 and 2, 4 joint little expanded; finger a little longer than 5th and 6tk joints combined. Peraeopod 5 very long and slender, 24 joint very little expanded, its hind margin slightly concave. Uropods 1 and 2, rami slender, apical spines unusually long. Uropod 3, peduncle longer than broad, ramus linear, setae almost confined Corophium ' 689 to the apex. Telson nearly as long as broad; apex narrowly truncate. Colour uniformly pale yellowish. L. 4 mm. Arectie Ocean, North-Atlantie, North-Sea and Skagerrak (Norway southward from Lofoten Islands; Bohuslän; East Frisian Coast, depth 19—56 m; Shetland Isles); Kattegat; Boaphorus? 6. C. runeicorne DellaValle 1893 C. r., C. runeinatum, A. Della Valle in: F. Fl. Neapel, v.20 p. 13, 369 t.4 f.7, t.8 f.1--16, 19 | 1898 CO. runeicorne, Sowinski in: M&m. Soe. Kiew, v.15 p. 456. In elose agreement with C. affine, but with a few distinguishing points. Antenna 1 in SC, 1% joint with strong curved tooth direeted forward near the base; fiagellum 8—lU-jointed. Antenna 2 in d, ultimate joint of peduncle apparently without the distal tooth; 1° joint öf flagellum much longer than 24 and 34 combined, and with 4 teeth or nodules on its lower margin. Gnathopod 1, finger much longer than apex of 6!" joint, and with subapical tooth very large. Gnathopod 2, finger without denticle, but broad at base, and abruptly narrowed near apex. Peraeopods 1 and 2, finger much longer than 5tt and 6tk joints combined. Telson apically rounded. Colour pale yellowish, slightly brownish on the back. L. 4—5 mm. Bay of Naples, depth 10—20 m; Bosphorus, depth 44—85 m. 7. C. robustum O.Sars 1895 C.r., C©. bidentatum, G.O. Sars in: Bull. Ae. St.-Petersb., ser.5 v.3 p. 804; t.23 £.10—16 | 1896 C. r., Sowinski in: M&m. Soc. Kiew, v.15 p. 376. Back broad, flattened; pleon segments distinet, but 5tk from 6tk not very sharply. Head with obtuse-angled front. Side-plate 1 as in ©. chelicorne (p- 687). Eyes small, dark. Antenna 1 in Q not '/, as long as body, in J with densely setose peduncle; 24 joint shorter in Q than in d, in both considerably shorter than 1%; flagellum shorter than peduncle, about 12-jointed. Antenna 2, even in Q very robust, in S more than °/, as long as body; penultimate joint of peduncle nearly as long as ultimate and flagellum combined, apically produced to a moderately long, slightly eurved, spini- form projection, with small bilobed expansion within at its base; ultimate joint with recurved tooth above the middle and spiniform apical tooth; flagellum scarcely as long as ultimate joint of peduncle. Peraeopods 1 and 2, 24 joint laminar, . with long setae on front margin, 4% rather broad, about as long as 5tk and 6th combined, in JS densely setose in front. Peraeopod 5 considerably more than half as long as body. Uropods 1 and 2, rami without spines on inner margin. Uropod 3, ramus parallel-sided. Telson truncately triangular. Colour dark. L.9 7, 0 8 mm. Caspian Sea. Depth to 75 m. 8. C. mucronatum 0. Sars 1895 C. m., G. O. Sars in: Bull. Ace. St.-Petersb., ser.5 v.3 p.307 t.24 f.1—7 | 1896 C©. m., Sowinski in: Möm. Soe. Kiew, v.15 p. 375. Segments of pleon distinet, 5tk from 6 not very sharply. Head with sharp rostral point advanced beyond the narrow front corners. Eyes small, rounded, dark. Antenna 1 more than '/, as long as body, little setose; 1° joint longer than 24 and 34 combined, with 3 distant spinules; flagellum subequal to pedunele, 12-jointed. Antenna 2 little more than half as long as body, strong; penultimate joint of peduncle inflated, with mucronate projeetion reaching beyond middle of ultimate, and having a small tooth at its base within, near to which the eylindrie ultimate joint of peduncle puts Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I, 44 690 Coro phium forth a small recuryed tooth; flagellum rather shorter than ultimate joint of peduncle. Peraeopods 1 and 2, 24 joint deeidedly laminar, 4 distally wide, with slender setae on front, finger subequal to the stoutish 6" joint. Peraeopod 5 about half as long as body; 46th joints rather broad and compressed, bordered with fascieles of slender setae. L. S 6 mm. Caspian Sea. 9, C.curvispinum O.Sars 1895 ©. c., G.O.Sars in: Bull. Ac. St.-Pötersb., ser. 5 v.3 p. 302 t.23 f.1—9 | 1896 C. c., Sowinski in: M&m. Soc. Kiew, v.15 p. 375. Segments of pleon distinet, 5" from 6tk not very sharply. Head slightly angular at centre; front corners narrow, rather prominent. Eyes small. Antenna 1 in J very setose; 24 joint of peduncle fully as long as 1%; flagellum scarcely longer than 2 and 34 joints of peduncle combined, 12-jointed. Antenna 1 in Q scarcely '/, as long as body, sparingly setose; 18% joint of pedunele as long as 24 and 34 combined, with 4 or 5 spinules below; flagellum shorter than pedunele, 9-jointed, Antenna 2 in J nearly as long as body, penultimate joint of peduncle widening distally, produced to a strongly ineurved spiniform tooth, with slightly celeft tooth at its base within; ultimate joint of pedunele nearly as long as penultimate, cylindrie, a reeurved tooth near the base meeting the incurved point of the penultimate; flagellum shorter than ultimate joint of peduncle. Antenna 2 in © much less strongly developed. Gmnathopods 1 and 2 of the usual character. Peraeopods 1 and 2 short and stout, 24 joint laminar, 4 nearly as broad as long, setose on both margins; finger as long as 6% joint. Peraeopod 5 slender, about half as long as body. Uropod 2 short and stout, spines on the rami not numerous. Uroped 3 not very stout. L.Q 6, @ 7 mm. Caspian Sea. 10. ©. monodon O0. Sars 1895 ©. m., G.. ©. Sars in: Bull. Ace. St.-Petersb., ser.d v.3 p.309 t.24 f.8—16 | 1896 C. m., Sowinski in: Mem. Soc. Kiew, v.15 p. 374. Body rather slender, especially in d. Pleon segments all distinet. Head, rostral projection almost a right angle, front corners narrow, little prominent. Eyes large, rounded, dark. Antenna 1 less than half as long as body; peduncle in CO setose below, in © sparingly setose; 1° joint longer than 24 and 34 combined, with 1 spinule at end of the joint; flagellum in J shorter than pedunele, 12-jointed, in Q as long as pedunele, 10-jointed. Antenna 2 in J about ®/, as long as body; penultimate joint of peduncle not greatly inflated, almost eylindrie, produced to a simple narrowly mucronate tooth, not nearly reaching middle of ultimate and without inner tooth; ultimate joint with rudiment only of a tooth near base; flagellum searcely half as long as ultimate joint of pedunele Antenna 2 in Q not longer than antenna 1, about '/, as long as body, without even rudiment of a tooth on ultimate joint of peduncle. Peraeopods 1 and 2 slender; peraeopod 5 about half as long as body. Uropod 2 very small, compared with uropod 1. Uropod 3, ramus mueh narrower than pedunele, with 1 spine among a few apical setae. Peraeon segment 7 and the rest of hind part of body almost devoid of pigment. L.Q 4, 9 5 mm. Caspian Sea. Depth to 75 m. 1l. C. erassieorne Bruz. 1859 CO. c., R.M. Bruzelius in: Svenska Ak. Handl., n.ser. ©.8 nr.1 p.15 t.1 f.2 | 1876 CO. e., A. Boeck, Skand. Arkt. Amphip., v.2 p. 626 t.28 f.8 | 1879 ©. c. (part.), Hoek in: Tijdsehr. Nederl. dierk. Ver., v.4 p.115 t.5 £.16, Corophium 691 t.8 £.4—10 | 1889 C. c., Hock in: Tijdschr, Nederl, dierk. Ver., ser.2 v.2 p.230 | 1893 C. c., A. Della Valle in: F. Fl. Neapel, v.20 p.867 t.55 f. 58,59 | 1894 C. c., G. O. Sars, Crust. Norway, v1 p.615 t.220 | 1896 & 98 C. c., Sowinski in: M&m. Soc, Kiew, v.15 p-373, 455 | 1862 C. spinicorne (2) (non Stimpson 1857!), Bate, Cat. Amphip. Brit. Mus., p.281 t.47 f.5 | 1863 ©. bonellü (part.: 2), Bate & Westwood, Brit. sess. Urust., v.1 p.497 f. | ?1868 ©. b., Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p. 96. Body broad, pleon segments 4—6 coalesced. Head, rostrum short, distinet, acute; lateral lobes prominent, acute. Side-plate 1 with 3 setae on the produced apex. Eyes small, rounded, dark brown with whitish coating. Antenna 1 scarcely '/;, as long as body in oO and less than '/, ind; 1° joint nearly as long as 24 and 34 combined, thick above, with 4 recurved spines at base, compressed below with row of about 6 spines; 34 joint much shorter than 24; flagellum shorter than pedunele, 6-jointed. Antenna 2 ind (Fig.117) ; Uropod ı Flagellum Uropod 3 --- Fig. 116. Fig. 117. : Fig. 118. Antenna 2, 2. Antenna 2, Q. Uropods 1—3 and telson. Fig. 116—118. O©. erassicorne. [After G.O. Sars.] stout, scarcely as long as body; penultimate joint of peduncle large, with 2 apical teeth, the outer reaching the sub-basal tooth of the ultimate, which is much shorter and narrower than the penultimate, and has a small apical tooth, a little separated from line of lower margin; 1° joint of flagellum with long setae, Antenna 2 in © (Fig. 116) little longer than antenna 1, stout; antepenultimate joint of peduncle with 3 or 4 stout spines, penultimate with 8—12 such spines along the sharp edge of its broad laminar expansion; ultimate joint of peduncle little more than half as long, with a strong median spine. Gnathopods 1 and 2 as in C. volutator (p. 686), except that the slender finger of gnathopod 2 has an inner dentiele. Peraeopods 1—5 as in C. volutator, except that in peraeopods 1 and 2 the finger is relatively longer, in peraeopods 3 and 4 the 4" joint less setose, and that peraeopod 5 is some- what more slender. Uropod 3, ramus oblong oval, nearly twice as large as peduncle (Fig. 118). Telson rather more obtusely rounded than in C. volutator. Colour whitish mottled with light brown. L. about 5 mm. Aretie Ocean, North-Atlantie with adjoining seas (Jan Mayen; Europe from Vadsö [Norway] to West-France, depth 11—37m); Bosphorus. Found in Norfolk in almost fresh water. 12. C. bonellii (M.-E.) 1830 Corophia b., H. Milne Edwards in: Ann. Sci. nat., v.20 p.385 | 1840 Corophium b., H. Milne Edwards, Hist. nat. Crust., v.3 p.67 | 1862 ©. b., Bate, Cat. Amphip. Brit. Mus., p. 282 | 1893 C. bonelli, A. Della Valle in: F. Fl. Neapel, v.20 p.368 | 1894 C. b., G. O. Sars, Crust. Norway, v.1 p. 616 t. 221 £.1. Oo. Pleon segments 4—6 coalesced. Head without proper rostrum, front produced in a broad triangle; lateral lobes short, apically rounded. Eyes large, very. dark. Antenna 1 about '/, as long as body; 1° joint slightly shorter than 24 and 34 combined, with small hooked spine near base and 44* 692 Corophium 3 spines along. lower margin; flagellum more than half as long as peduncle, 6-jointed. Antenna 2 little longer than antenna 1, not very stout; penultimate _ joint of pedunele nearly eylindrie, with 3 strong spines on margin, ultimate rather shorter, with a spine beyond centre of lower margin. Gnathopod 1, 6th joint widening a little distally, palm rather oblique, finger extending very little beyond it. Gnathopod 2, finger with subapical denticle. Peraeo- pods 1 and 2, 4th joint rather broad, 5t" very short, finger subequal to 5th and 6tk combined. Peraeopod 5, 24 joint oval, the others very slender. Uropod 3, peduncle very short, ramus broadly oval, fringed with 7—9 setae. Telson twice as broad as long, transversely truncate at apex. Colour whitish, dorsally banded with dark brown. L. 6 mm. — G unknown. North-Atlantie, North-Sea, Skagerrak and English Channel (South- und West- Norway up to the Trondhjemsfjord; South-England; West-France). Depth 11—19 m. : C. acherusieum A. Costa ?1851 Audowinia acherusica (nom. nud.), (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p.24 | 1857 Corophium acherusicum, A. Costa in: Mem. Ace. Napoli, v. 1 p.232 | 1893 C.a., A. Della Valle in: F. Fl. Neapel, v.20 p. 364 t.1 £.11; 1.8.17, 18, 20—41 | ?1898 C. a., Sowinski in: Mem. Soc. Kiew, v.15 p.455 | 1897 ©. bonellii (part.), (T. Stebbing in:) H. J. Hansen, Choniostom., p. 113, 114. Perhaps identical with €. bonellii (p. 691). Mediterranean; tropieal Atlantic (Cuba); tropieal Paeific (Hong Kong). C. contractum Stimps. 1855 C.ce., Stimpson in: P. Ac. Philad., v.7 p.383 | ?1881 ©. c., G.M. Thomson in: Tr. N. Zealand Inst., v.13 p.220 t.8 f.9 | 1893 ©. c., A. Della Valle in: F. Fl. Neapel, v.20 p. 374 | ?1886 C. bonnelli, G.M. Thomson & Chilton in: Tr. N. Zealand Inst., v.18 p. 142. Possibly identieal with C. bonellii (p. 691). & 3—4 mm. Pacifie (Japan, New Zealand). C. eylindrieum (Say) 1818 Podocerus ceylindricus, Say in: J. Ac. Philad., v. lır p. 387 | 1873 Corophium eylindricum, (S.1I. Smith in:) A. E. Verrill in: Rep. U.S. Fish Comm., v.1 p.370, 566 | 1888 C. c., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 104 | 1893 ©. c., A. Della Valle in: F. Fl. Napel, v.20 p. 376. North-Atlantie (from New Jersey to Vineyard Sound). C. dentatum Fr. Müll. 1864 C.d., Fritz Müller, Für Darwin, p.5l | 1893 C. d., A. Della Valle in: F. Fl. Neapel, v.20 p. 375. Brazil? C. quadriceps Dana 1852 C. q., J. D. Dana in: P. Amer. Ac., v2 p.219 | 1853 & 55 C. ?q., J. D. Dana in: U, S. expl. Exp., v.13u p. 836; 1.55 f.8 | 1888 C. ?gq., T. Stebbing in: Rep. Voy. Challenger, v.29 p.255 | 1893 C. gq., A. Della Valle in: F. Fl. Neapel, v.20 p. 374. Probably a young form. L. ‚about 2 mm. Harbour of Rio Janeiro. C. salmonis Stimps. 1857 C©.s., Stimpson in: Boston J. nat. Hist., v.6 p.514 | 1888 C. s., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 303 | 1893 C. s., A. Della Valle in: F. Fl. Neapel, v.20 p. 375. Puget Sound. = % C. spinicorne Stimps. 1857 €. s., Stimpson in: Boston J. nat. Hist., v. 6 p. 514 | 1857 C. s., Stimpson in: P. Oalif. Ac., v.1 p.89 | 1893 ©. s., A. Della Valle in: F. Fl. Neapel, v.20 p. 375. L. 10 mm. San Francisco Bay. ir gi ae Be a 5 ee Cheluridae, Chelura 693 39. Fam. Cheluridae 1847 Cheluridae, G.J. Allman in: Ann. nat. Hist., v. 19 p. 361 | 1876 C., A. Boeck, Skand. Arkt. Amphip., v.2 p. 645 | 1888 C., T. Stebbing in: Rep. Voy. Challenger, v.29 p.218 | 1894 C., G. O. Sars, Crust. Norway, v.1 p.626 | 1893 Cheluridi, A. Della Valle in: F. Fl. Neapel, v.20 p. 345. Pleon segments 4—6 coalesced. Side-plates small. Antenna 2 with blade-like flagellum. Mouth-parts on the whole normal. Pleopods with peduncle produced on the inner side. Uropods 2 and 3 abnormal (Fig. 119 p. 694). Marine. 1 genus with 1 species. 1. Gen. Chelura Phil. 1839 Chelura (Sp. un.: ©. terebrans), A. Philippi in: Arch. Naturg., v.dı p. 120 | 1876 C., A. Boeck, Skand. Arkt. Amphip., v.2 p.646 | 1888 C., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 181, 217, 1670 | 1893 C., A. Della Valle in: F. Fl. Neapel, v.20 p- 346 | 1894 C., G. O. Sars, Crust. Norway, v.1 p. 626 | 1847 Nemertes (nom. nud.), A. White, Crust. Brit. Mus., p. 90. Body (Fig. 119 p.694) broad, subdepressed, pleon segments 1 and 2 very short. Head without rostrum. Antenna 1 short, with accessory flagellum. An- tenna 2 longer and much gtouter. Mouth-parts prominent. Upper lip with the margin entire. Lower lip with inner lobes thin, adpressed. Mandible, molar strong; palp rather short, 3% joint about as long as 24. „Maxilla 1, inner plate narrow, tipped with 3 short setae, outer with 9 spines, palp long. Maxilla 2, inner plate having 2 setae on inner margin, of which the more distal is the longer. Maxillipeds, inner plates rather long, its apical spines slender, seemingly unaccompanied by spine-teeth. Gnathopod 1 the stronger. Peraeo- pods 3—5, 24 joint little expanded. Uropod 2 subdorsal in position, with greatly expanded pedunele and very short rami. Uropod 3, peduncle very short, inner ramus rudimentary, outer large and laminar. Telson entire. Only one pair of hepato-pancreatic coeca. 1 species. 1. C. terebrans Phil: 1839 C.t., A. Philippi in: Arch. Naturg., v.5ı p.120 t.3 £.5 | 1847 ©. t., G. J. Allman in: Ann. nat. Hist., «.19 p.361 t.13, 14 | 1880 ©. t., S. I. Smith in: P. U. S. Mus., v.2 p.233 f. | 1888 C. t., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1695 | 1893 C. t., A. Della Valle in: F. Fl. Neapel, v.20 p.347 t.6 £.3; 1.7 £.1—22 | 1894 C. t, G. O. Sars, Crust. Norway, v.1 p. 627 t. 225 | 1847 Nemertes nesaeoides (nom. nud.), A. White, Crust. Brit. Mus., p. 90 | 1863 Chelura terebans, Bate & Westwood, Brit. sess. Crust., v. 1 p. 508 f. | 1868 ©. pontica, Czerniavski in: Syezda Russ. Est., Syezda 1 Zool. p.95 t.7 f.1—18 | 1868 Limnoria zylophaga, E. Hesse in: Apn. Sei. nat., ser.5 v.10 p. 101. Back broadly vaulted, with setules rising from hind margin of the segments. Pleon segment 3 dorsally produced to a conical curved process much longer in 9 than in 9, with a short process on each side of it; the follo- wing segment (4 —6th in coalescence) is dorsally flat, reetangular, in J nearly half, in © about °/, as long as the rest of the body. Head, lateral lobes rounded, post-antennal corners well defined. Side-plates successively less deep, 1° rounded quadrate, 5!" and 6th bilobed. Pleon segment 3, postero- lateral corners quadrate. Eyes on lateral lobes of head, small, rounded, dark. Antenna 1 about '/, as long as body; flagellum rather setose, as long as 24 and 34 joints of peduncle combined, 6-jointed; accessory flagellum with 2 joints, 24 minute. Antenna 2 curving; ultimate joint of peduncle little 694 Chelura, Podoceridae longer than penultimate or antepenultimate, like the flagellum densely setose; flagellum about 2',, as long as broad, consisting of 1 massive den tipped with 1 or 2 minute ones almost hidden in the setose clothing. chelate, small, 5tk joint shorter than 6%, which is oblong, a little curved, the short thumb not strongly produced, stouter than the small finger, which inelines towards it, giving almost a subchelate appearance. Gmathopod 2 longer but more slender, 5t" joint nearly as long as the narrow, subfusiform 6th, which ends in a chela smaller but more definite than that of gnathopod 1. Peraeopods 1--5 not elongate; 24 joint slightly expanded, 4 distally widened, 5tt short, 6! distally narrowed ; finger short, curved; x inperaeopods 3—5 the 24 and SAN th joints finged with long 2 setae. Branchial vesielesrather large. Marsupial plates nar- row. Pleopods 1—3 have Fig. 119. C.terebrans, 3. Lateral view. ratherelongate coupling Ser [After @. O. Sars.] on expanded inner part of pe- ; dunele; 1° joint of inner ramus with inner margin smooth. Uropod 1, peduncle more than twice as long as rami; inner ramus the broader, with 3 apieal spinules. Uropod 2 attached elose to uropod 1; peduncle enormousiy expanded, the expansion in © long as well as broad and densely hirsute, in J broader than long, with serrate margin; in both sexes rami very short, laminar, apically serrate, Uropod 3, attached far from the others; pedunele short, inner ramus oval, minute, not visible from above; outer very large, in d very long, broad, spinulose, narrowing distally;, in © much shorter, but still large, broadly oval, with margin_serrate and spinulose. Telson subcarinate dorsally, about as broad as long, irregularly tapering to an acute point, furnished with a few setules. Colour light brown. L. 9 5, 9 6 mm. North-Atlantie with adjoining seas (Europe from Norway to the Black Sea; North America). In submerged or partially submerged or waterlogged timber. 40. Fam. Podoceridae 1849 Dulichidae, J. D. Dana in: Amer. J. Sei., ser. 2 ©.8 p.135, 140 | 1857 Dyopedidae, Bate in: Ann. nat. Hist., ser.2 «19 p.150 | 1876 Dulichidae, A. Boeck, Skand. Arkt. Amphip., v.2 p.649 | 1888 Dulichiidae, T. Stebbing in: Rep. Voy. Challenger, 0.29 p.1182 | 18938 Dulichidi, A. Della Valle in: F. Fl. Neapel, ©.20 p.314 | 1894 Dulichiidae, &. ©. Sars, Crust. Norway, v.1 p.628. Pleon segment 4 elongate, 5tk and 6t# very short, one of them some- times missing. Side-plates small, shallow (Fig. 122, 126 p. 705,712). Antennael and 2 elongate, setose; the relative length varying; flagellum shorter than pedunele; aecessory flagellum present or absent. Upper lip slightly bilobed. Lower lip with inner lobes. Mouth-parts normal. Gnathopod 2 usually much larger than gnathopod 1 and much larger in Ö than in ©. Peraeo- pods 3—5 usually elongate, 24 joint not or little expanded. Pleopods 1—3 (Fig. 120 p. 696), peduncle not expanded. Uropod 1 normal, of uropods 2 and 3 one or other missing or rudimentary or abnormal. Telson entire (Fig. 121, 127, p. 696, 714). Marine. 8 genera, 30 accepted species and 1 obseure. nathopod 1 . a RN 2 ER en RIES Se Be en a et Podoceridae, Laetmatophilus 695 Synopsis of genera: Antenna 1 without accessory flagellum — 2. Antenna 1 (Fig. 122 p.705) with accessory flagellum — 4 Pleon with only 5 distinet segments are, N Re ee Sr ae? 1, Gen. Laetmatophilus p. 695 Pleon with 6 distinet segments preceding the telson — 3. Pleon segment 5 earıying uropods . =»: - . 2. Gen. Cyrtophium . . p:697 Pleon segment 5 not earrying uropods . . . 3. Gen. Leipsuropus . . p. 698 > | 3 pairs of uropods (Fig: 125 p. 707) present — 5. 2 o 4 ! Only 2 pairs of uropods (Fig. 127 p. 714) present — 7. Antenna 1 longer than antenna 2 ..... 4. Gen. Xenodice . . . p.699 Antenna 1 shorter than antenna 2 (Fig. 122, 123 p. 705, 707) — 6. Gnathopods 1 and 2 subehelate . ..... 5. Gen. Podocerüs . . . p.700 Gnathopods 1 and 2 (Fig. 124 p.707) simple 6. Gen. Ieilius ... .. . p. 706 Last pair of uropods normal . . .. .... 7. Gen. Dulichia. . . . p. 708 Last pair of uropods (Fig. 127) rudimentary 8. Gen. Paradulichia . . p.713 5 fer) 7 1. Gen. Laetmatophilus Bruz. 1859 Laetmatophilus (Sp. un.: L. tuberculatus), R. M. Bruzelius in: Svenska Ak. ‘ Handl., n. ser. v.3 nr. 1 p.10 | 1886 L., Gerstaecker in: Bronn’s Kl. Ordn., v.5ır p.493 | 1888 L., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1197 | 1893 L., A. Della Valle in: F. Fl. Neapel, v.20 p.316 | 1894 L., G. O. Sars, Crust. Norway, v.1 p.629 | 1873 Laetmophilus, A. Marschall, Nomenel. zool., p.411 | 1885 Laematophilus, Haswell in: P. Linn. Soe. N. S. Wales, ©. 10 p. 107, 110. Peraeon with marked constrietion between segments 1 and 2; segments behind constrietion much broader in O than ind‘. Pleon consisting of 5 segments, each carrying a single pair of legs; last 3 segments reflexed. Head with frontal process carrying antenna 1. Side-plates small, 24 largest in J, 34 in 9. Antennae 1 and 2 strong, setose, with flagellum few-jointed; no accessory flagellum to antenna 1; antenna 2 the longer. Upper lip bilobed. Mandible with large palp; 34 joint setose, broad ended. Maxilla 1. inner plate small; palp 2-jointed. Maxillipeds, outer plates reaching much beyond the smaller inner plates; 4th jan of palp bluntly eonieal. Gnathopod 1 much smaller than gnathopod 2 ‚ Stk and 6 joints subequal. Gnathopod 2, 5th joint small, 6th broader in oO, "longer i in d; finger large. Peraeopods 1—5 subequal; 24 joint not expanded, 6*h joint the longest; finger strong, curved. Branchial vesicles very small. Marsupial plates large and broad. Pleopods 1—3 (Fig. 120 p. 696) feeble. Uropod 1 (Fig. 121 p. 696), inner ramus much longer than outer. Following uropod (probably uropod 3) consisting of a small simple plate. Telson simple, rounded. 4 species. Synopsis of species: 1 | Without dorsal tubereles . . : . .. 22.220. 1. L. purus . . .9P9.6% With dorsal tubereles — 2. $ Dozsal tabereles obtuse. . 2... ...r.: 0.8 2: L. tubereulatus p. 696 \ Dorsal tubereles spiniform — 8. 8 | Tubereles not more than 2 in transverse row. . . 3. L.armatus . . p.697 Tubereles as many as 4 in transverse row . . . . 4. L.hystrix. . . p.697 Bad: = en es 696 Laetmatophilus 1. L. purus Stebb. 1888 L.p., T. Stebbing in: Rep. Voy. Challenger, v. 29 p.1198 t.132 | 1894 L.p., G. O. Sars, Crust. Norway, v.1 p.630 | 1893 L. tuberculatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 317. Back appearing transversely corrugated; head and peraeon segments 1—5 each having a dorsal depression; peraeon segment 3 with small ventra process; pleon segment 4 eylindrical, longest.of all segments. Eyes round, dark, on prominent lobes. Antenna 1, 1° joint of peduncle '/, as long as 34, 24 Jonger than 34, flagellum as long as 34, with 3 joints, 1° nearly thrice as long as 24 and 3% combined. Antenna 2 stouter, ultimate joint of peduncle longer than penultimate, subequal to 1% and 24 of pedunele of antenna 1 combined; flagellum of 1 long joint with 1 or 2 microscopie apical joints. Gnathopod 1, 4% joint short, setose, 5 ovoid, strongly fringed with plumose setae or spines on hind margin, 6! widening almost abruptly at base, with very short hind margin, and long, oblique, slightly convex, crenate palm, fringed with plumose spines, and having a row of 10 elose-set serrate spines leading to the defining angle; finger matching palm, distal half of inner margin with about 12 decurrent spine-teeth. Gnatho- pod 2 in C, 24 joint short, broad, the channelled front with projecting ‚apices, 34, 4th and 5th joints very short, 4 joint with acute apex, 6th very long, a sort of oblong oval, having near the finger-hinge a broad lobe followed by a narrow blunt tooth; the long strong finger elosing over these, and leaving a narrow gap be- tween its smooth inner margin and on un that of the hand, on the surface of Pleopod 3. Breuer sad telson. which it applies its apex near the Fig. 190 & ı21. L. purus. base, the meeting of hind margin and palm being indefinite. Peraeo- pods 3—5, 24 joint a little longer than the 4b, shorter than the 5th, Pleopods 1—3 (Fig. 120), peduncle much shorter than rami, with 6 or 7 pairs of coupling spines; joints of rami 11—13, no cleft spines observed. Uropod 1 (Fig. 121), pedunele as long as outer ramus, which is less than °/, as long as the broader inner ramus; both with spines on both margins. Terminal uropod narrowly oval, when turned obliquely inward covered by the almost eireular telson (Fig. 121). L. about 6 mm. Off Cape of Good Hope. SEEN PER 7 Uropod1, inner ramus 2. L. tubereulatus Bruz. 1859 L.t., R. M. Bruzelius in: Svenska Ak. Handl., n.ser.v.d nr.1 p.11 t.1 f.1 | 1876 L.t., A. Boeck, Skand. Arkt. Amphip.. v.2 p. 663 t.29 £.7 | 1877 L. t., Meinert in: Naturh. Tidsskr., ser. 3 v. 11 p. 166 | 1893 L. t. (part.), A.Della Vallein: F.Fl. Neapel, v.20 p.317 1.55 f.1—3 | 1894 L.t.(part.), G. O. Sars, Crust. Norway, v.1 p.630 t.226 | ?1898 L.t., Sowinski in: M&m. Soc. Kiew, v.15 p.451 t.8 f. 1—8. Head with small dorsal tuberele. Segments of peraeon transversely furrowed, 1° with 2 dorsal tubereles, one behind other, 24 with small tubercle in front of furrow; the remainder rugged in outline, scarcely tubereular. m IE EL he EEE u ee ee Ft : Laetmatophilus, Cyrtophium 697 Eyes rounded, slightly protuberant, with light yellowish pigment. Antennae 1 and 2 about as in L. purus. Antenna 1 about °/, as long as body. Gnatho- pod 1 as in L. purus, except 6!" joint gradually widening to the palm, which is not longer than hind margin, somewhat oblique, setose, defined by an obtuse angle, slightly overlapped by the apparently not denticulate finger. Gmathopod 2 in J as in L. purus, except that the tooth on the . 6 joint is more acute. Gnathopod 2 in O, apex of 4th joint more produced than in S; 6h joint broad, rounded oval; palm convex, defined by a short tooth; finger strong, curved, matching palm. 'Peraeopods 1—5 subequal, slender; 24 joint much longer than 4, subequal to 6%, which is longer than 5th; finger strong, curved. Pleopods (in Sars’ figure) with 9-jointed rami. Colour yellowish. L. 4—5 mm. Arctic Ocean, North-Atlantie, North-Sea, Skagerrak and Kattegat (Scandinavian eoasts). Depth 45—600 m. 3. L. armatus (Norm.) 1869 COyrtophium armatum, A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.285 | 1888 Laetmatophilus a., Chevreux & Guerne in: ©.-R. Ac. Sei., v. 106 p. 626 | 1888 L. a., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1628 | 1894 L..a., 6. O. Sars, Crust. Norway, v.1 p.632 t.227 £.1 | 1895 L.a., A. M. Norman in: Ann. nat. Hist., ser.6 v.15 p.493 | 1871 L. spinosissimus, A. Boeck in: Forh. Selsk. Christian., 1870 p.266 | 1893 L. tuberculatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 8317. Head with dorsal tuberele acutely produced. Peraeon segment 1 with 2 spiniform tubercles, one behind other, segment 2 with 1 median, followed by 2 side by side, segments 3—7 and pleon segments 1 and 2 each with a transverse pair. Appendages closely agreeing with those of L. tuberculatus. Colour light yellowish, transversely banded with vivid orange. L. scarcely 4 mm. Arctie Ocean, North-Atlantie and North-Sea (West-Norway to Lofoten Islands, depth 94—565 m; Shetland Isles, depth 180-200 m). 4. L. hystrix (Hasw.) 1880 Cyrtophium? h., Haswell in: P. Linn. Soc. N.S. Wales, v.5 p.104 t.7 f.3 | 1885 Laematophilus h., Haswell in: P. Linn. Soc. N. S. Wales, v.10 p-110 | 1893 Laetmatophilus tuberculatus (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.317. Head, peraeon segments 1—7 and pleon segments 1 and 2 armed with spiniform tubereles. Of these there is a median row, flanked on the peraeon and perhaps also on the head by 2 lateral rows on each side; lateral borders of peraeon segments 2—6 produced outward and upward, acuminate. Side-plates with an acute point on lower margin. Appendages appear in «lose agreement with L. purus, but in gnathopod 1 in S the 6! joint is without the long row of spines at defining angle of palm. Gnathopod 2 in J not observed. Gmnathopod 2 in Q as in L. tuberculatus. Rami of pleopods with 6—8 joints. Uropod 1, outer ramus ?/, as long as inner. L. about 4 mm. - Port Jackson and Port Stephens [East-Australia]. 2. Gen. Cyrtophium Dana 1852 Cyrtophium, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.309 | 1853 C. (Sp. un.: (©. orientale), J. D. Dana in: U. S. expl. Exp., v. 1311 p.831, 839. Agreeing with Podocerus (p. 700) except that antenna 1 has no accessory flagellum, and the longer ramus in uropods 1 and 2 is broad comparatively. 2 accepted species, 1 doubtful. 698 Cyrtophium, Leipsuropus Synopsis of accepted species: Gnathopod 2 in d, palm and hind margin smoothly eontinuous 1. C. orientale.. . p. 698 Gnathopod 2 in d, palm well defined, forming three strong teeth TIER hl ic BE Mae EN Bu A, IE ar Ze LE Ba Tat ER “er. . +. 0. 9, ©. minutum . pP: 698 1. ©. orientale Dana 1853 & 55 (©. o., J. D. Dana in: U. S. expl. Exp., » 18u p. 840; 1.56 f. 1a—d | 1893 Platophium o. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.332. Body elliptical, dorsally eorrugated, not carinate. Antennae 1 and 2 subpediform, subequal. Antenna 1, flagellum with 3 subequal joints, together subequal to 3% joint ofpedunele. Antenna 2, flagellum with 3 joints, the 1° long, stiliform, longer than ultimate joint of pedunele, the other 2 minute. Gnatho- pod 2, 6 joint stout, subelliptical, nearly straight below and hirsute; finger nearly as long as 6th joint. Peraeopod 5 (in figure) almost completely unarmed; 24 joint quite narrow. Uropods 1 and 2, apical spines of great length, numerous spines on inner margin of the broad longer ramus, the. other subterete. Telson (in figure) bluntly triangular. L. about 4 mm. Strait of Singapore. 2. C. minutum Hasw. 1879 ©. m., Haswell in: P. Linn. Soe. N. S. Wales, ». 4 p. 8348 t.22 f.6 | 1885 ©. m., Haswell in: P. Linn. Soc. N. S. Wales, v.10 p.109 t.18 f. 1—5, 9 | 1888 C. m., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1193 | 1893 Plato- phium m., A. Della Valle in: F. Fl. Neapel, 0.20 p. 334. Body corrugated, most strongly on pleon segments 1—3. Eyes prominent. Antennae 1 and 2 subequal. Antenna 1, fiagellum with 3 joints, the 1° longer than 24 and 34 combined, the 34 very small. Antenna 2, flagellum much shorter than ultimate joint of pedunele, with 2 joints, 1° long, stout, 24 minute, tipped with curved spine. Mandible, 34 joint of palp less dilated than in Podocerus (p. 700). Gmnathopod 1 as in Podocerus, except that the palm is less strongly distinguished from hind margin of 6" joint. Gnathopod 2 in I, 4% joint distally produced to an acute point and very hirsute, 5th rudely squared, not projecting, 6" with front margin smoothly eurved, not notched for spines; palm defined from short hind margin by long tooth, which the apex of finger reaches, arching over 2 others. Peraeo- pods 1—5 all nearly alike; 24 joint short and narrow, with a little projeetion at upper corner, 5t" Jonger than 4%, 6th than 5th; the spinules on the 6% joint very unimportant in appearance. Pleopods 1—3 each with 4—6 coupling spines. Uropods 1-3 and telson about as in ©. orientale. Colour pellueid with brown dots, and across the head a brown band. L. 2—3 mm. Port Jackson [East- Australia]. C.laeve Heller 1866 C©.1., Cam. Heller in: Denk, Ak. Wien, #261 p.49 t.4 f.9—12 | 1893 Platophium brasiliense (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.329. Adriatie (Lesina). 3. Gen. Leipsuropus Stebb. 1899 Leipsuropus (Sp. un.: Oyrtophium parasiticum), T. Stebbing iv: Ann. nat Hist., ser. 7 v.3 p. 241. Like Cyrtophium (p. 697), but pleön segment 5, though present, devoid of legs. 1 species. Leipsuropüus, Xenodice 699 1. L. parasiticus (Hasw.) 1879 Oyrtophium parasitieum, Haswell in: P. Linn. Soe. N. S. Wales, v.4 p.274 t.12 f.1| 1885 C, p., Haswell in: P. Linn. Soe. N. S. Wales, v.10 p. 107 £.17 £. 1—7 | 1893 Platophium p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.335 ! 1899 Cyrtophium p., Leipsuropus, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 241. Body without medio-dorsal. processes, laterally tuberculate, peraeon dorsally ovate, widest at 4!" segment, division between segments 6 and 7 dorsally obseure, pleon segment 5 very short. Side-plates squared, with rounded corner, 4% widest, slightly emarginate below. Eyes round, rather prominent. Antenna 1 elongate, slender, 1° joint scarcely half as long as 24, 34 a little shorter than 24; flagellum as long as 24 joint of peduncle, with 4 joints, 1° rather longer than the other 3, 34 longer than 24. Antenna 2 longer and much stouter; ultimate joint of peduncle rather longer than penultimate; flagellum as long as penultimate joint of pedunele, 1 long stout joint with a minute terminal (Haswell: flagellum with traces of division into 9 joints). Gmnathopod 1, 24 joint shorter than 5, 34 —-6th getose on hind margin, 5" broad except at base, 6!" rather shorter and narrower than 5th, oval, hind margin extremely short, forming an angle with the long, convex, oblique palm ; finger long and strong, not quite reaching end ofpalm. Gnathopod 2 in d, 24 joint much shorter than 6%, 3d—5th very small, 6! powerful, elongate, narrowest at base, front margin convex, hind nearly straight but with a shallow emargination, variable in position, much or little or not at all overlapped by the strong and long, smooth finger; one of the points of the emargination much or little projeeting, and perhaps to be regarded as defining the palm from the straight hind margin. Gmnathopod 2 in Q (in figure), 6% joint widening greatly to a nearly transverse, slightly sinuous, well defined palm, matched by the finger. Peraeopods 1—5 of uniform structure, very slightly armed; 24 joint short, not expanded, 4*k joint very short, Stk stout, longer than the 24, rather shorter than the 6"; finger curved, acute. Pieo- pods 1—3, peduncle of pleöpod 1 with rectangular inner corners, peduncles of 24 and 34 successively shorter, inner corners rounded, so that the inner rami are not contiguous to one another; coupling spines 4 pairs; rami 7- or 8-jointed. Uropod 1 slender; pedunele slightly overlapping telson; outer ramus slightly longer than pedunele, nearly °/, as long as inner, with spinules on outer margin, inner with spinules on both margins. Uropod 3, the narrowly oval plates not reaching end of the obtusely pointed ovate telson. L. 4—5 mm. Port Jackson [East-Australia]. 4. Gen. Xenodice Boeck 1871 Xenodice (Sp. un.: X. frauenfeldti), A. Boeck in: Forh. Selsk. Christian., 1870 p.266 | 1876 X., A. Boeck, Skand. Arkt. Amphip., 0.2 p.665 | 1888 X, T. Stebbing in: Rep. Voy. Challenger, #.29 p.402|1893 X., A. Della Valle in: F. Fl. Neapel, v.20 p. 318 | 1894 X., G.O.Sars, Crust. Norway, v.1l p.632|1895 Zenodice, A. M. Norman in: Ann. nat. Hist., ser.6 ®»15 p. 49. Body slender. Pleon segment 4 much longer than 5!" and 6, Head produced over base of antenna 2. Side-plates small, subequal. Antennae 1 and 2 elongate; flagellum many-jointed; antenna 1 the longer, with accessory flagellum. Upper lip faintly bilobed. Mandibular palp large; 3° joint setose, broad-ended. Maxilla 1, inner plate fringed with 7 or 8 setae. Maxilla 2, inner plate with long row of setae fringing inner margin. Maxillipeds, outer plates reaching much beyond small inner plates. Gmathopods 1 and 2 not very unequal, not much stronger in J than in 9. Peraeopods 1—5 very 700 Xenodice, Podocerus slender and long; 2% joint the longest, linear. Peraeopods 3—5 successively longer. Branchial vesicles very small. Pleopods well developed. Uropods 1 and 2 normal. Uropod 3 rudimentary, not reaching end of squamiform telson. 1 species. 1. X. frauenfeldti Boeck 1871 X. f., A. Boeck in: Forh. Selsk. Christian., 1870 p. 267 | 1876 X. f., A. Boeck, Skand. Arkt. Amphip., v.2 p. 666 | 1893 X. f., A. Della Valle in: F. Fl. Neapel, v.20 p.319 | 1894 X. f., G. O. Sars, Crust. Norway, vl p-633 1.227 f.2 | 1895 Zenodice f., A. M. Norman in: Ann. nat. Hist., ser.6 v.15 p.49. Body long, nearly cylindrie, smooth; pleon segment 4 produced latero- dorsally into 2 microscopie teeth. Head long, front truncate. Side-plates sub- quadrate. Pleon segment 3, postero-lateral corners quadrate. Eyes represented by 2 patches of whitish pigment. Antenna 1 nearly as long as body, 1° joint of peduncle about half as long as 24 or 34, flagellum rather shorter than 24 and 34 combined, about 12-jointed; accessory flagellum 4- or 5-jointed. Antenna 2 rather shorter, ultimate and penultimate joints of peduncle subequal; flagellum more than half as long as peduncle, 9-jointed. Gnathopods 1 and 2 setose. Gnathopod 1 in JS, 5!" joint longer and wider than the oval, distally narrowed 6'h; palm oblique, defined by a palmar spine, slightly overlapped by the finger. Gnathopod 2 in J, 5th joint as long as 6%, which is widest where the straight, very oblique palm is defined by a strong tooth. Gmathopod 1 in © more slender than in J, but similar. Gnathopod 2 in Q like gnatho- pod 1, but rather stouter; marsupial plates long and narrow. Peraeopods 1 and 2 nearly twice as long as the gnathopods; peraeopods 3—5 still longer. -Uropod 1 longer than uropod 2, the rami slender in both, outer rather the shorter. Uropod 3, the small single joint scarcely reaching end of the obtusely pointed telson. Colour greyish white, transversely banded with faint orange. L. 8—14 mm. Arctie Ocean, North-Atlantie and North-Sea (Trondhjemsfjord, Lofoten Islands, Rödberg, Hardangerfjord). Depth 150—565 m, 5. Gen. Podocerus Leach 1813/14 Podocerus (Sp. un.: P. variegatus). Leach in: Edinb. Enc., v.7 p.433 | 1899 P., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.237 | 1852 Platophium, J. D. Dana in: Amer. J. Sei., ser.2 v.14 p.309 | 1853 P. (Sp. un.: P. brasiliense), J. D. Dana in: U.S. expl. Exp., v.13u p.831, 837 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v. 29 p-.257,1184 | 1893 P. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.327 | 1894 P. (part.), G. O. Sars, Crust. Norway, v.1 p. 629, 630 | 1885 Dexiocerella, Haswell in: P. Linn. Soe. N. S. Wales, v. 10 p. 107. Pleon narrow, ventrally flexed; its 4 segment elongate, 5tt and 6th very short. Head quadrate. Side-plates 1—7 small, shallow. Pleon segment 3, postero-lateral corners distally rounded. Eyes prominent,‘ placed at front corners of the head (Fig. 122 p.705). Antenna 1 shorter than antenna 2, fringed below with long setae; flagellum much shorter than peduncle; accessory flagellum usually 1-jointed, always small. Antenna 2 longer in Ö than in 9; flagellum much shorter than peduncle, few-jointed. Upper lip slightly bilobed. Lower lip, inner lobes well developed. Mandible normal, with spine-row of 2 or 3 spines; palp much longer than trunk, 39 joint short, distally widened and fringed with many spines. Maxilla 1, inner plate obsolete, outer with 9 spines on the distal margin, palp with a few spine- teeth on apex of the long 2 joint. Maxilla 2, inner plate the shorter, Podocerus 701 spines almost confined to distal margin. Maxillipeds normal, 4 joint of palp short, not unguiform, tipped with spines. Gmathopods 1 and 2 sub- chelate; gnathopod 1 much the smaller. Gnathopod 2, 5t joint small, in C sometimes coaleseing with the large 6t% joint, which is usually more elongate than in the ©, in both sexes having the front margin notched for spines. Peraeopods 1—5, 24 joint never very large; finger strong and curved. Branchial vesieles tending to develop extra lobes or become twisted. Marsupial plates of great size. Uropods 1 and 2, peduncle and rami spinose; one ramus decidedly shorter than the other; 1. spine in the apical group very long. Uropod 3, a small hollow plate facing the telson’s lateral margin. Telson entire, with a process on the upper surface carrying spinules. 10 species. Synopsis of species: 1 f Body not carinate — 2. \ Body more or less carinate — 9. Peraeopods 1 and 2, 2d joint expanded . . . 1. P.cheloniae.. . . . p. 701 | Peraeopods 1 and 2, 2d joint not conspieuously expanded — 3, =, Antenna 1, accessory flagellum 4(?)-jointed . 2. P. andamanensis. . p.702 2 Antenna 1, accessory flagellum 1(?)-jointed —- 4. Gnathopod 1 in 2, palm shorter than hind mern OE GB Toink. 2 2... 3. P. inconspicuus . . p. 702 Gnathopod l in 2, palm longer than Gene - margin of 6th joint — 5. Gnathopod 2 in d, palm with strong teeth — 6. Gnathopod 2 in 3, palm without strong teeth — 8. i | | Gnathopod 2 ind, palm defined by a strong 5 Ve 2: Pe lobatus ... ::.% p- 703 Gnathopod 2 in d, palm not defined by a strong tooth — 7. = Antenna 2 inä.not very elongate ..... 5. P. chelonophilus . p.703 Antenna 2 ind very elongate ....... 6. P. variegatus . . . p. 703 Peraeopods 1—5, sth joint with stout spines 8 on lower half of inner margin... .. . 7. P. brasiliensis . . . p. 704 Peraeopods 1—5, 6th joint with stout spines on upper half of inner margin. .... . 8. P-Jaevis, 4,00% p- 704 Carinate processes from head to pleon segment3. 9. P.danae. . .. . . p- 705 9 2 Carinate processes from peraeon segment 6 to pleop segment 2% = .» - » ir. 10. P. eristatus . . . . p. 706 1. P. cheloniae (Stebb.) 1888 Platophium c., ®. Stebbing in: Rep. Voy. Challenger, v.29 p.1190 t.130 | 1893 P. chelonophilum (part.), Chevreux & Guerne in: Bull. Soe. ent. France, p. 118 | 1899 Podocerus chelonophilus (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.239 | 1893 Platophium brasiliense (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 329. Body elliptical, smooth. Eyes round. Antenna 1 short; .flagellum as long as 24, longer than 34 joint of peduncle, 4-jointed; accessory flagellum 1-jointed. Antenna 2 rather longer, robust; flagellum °?/, as long as ultimate joint of peduncle, 3-jointed. Gnathopod 1, 5tk joint about as long and broad as the oval 6"; palm and hind margin scarcely distinguished, both spinose; finger with 2 teeth on inner margin. Gnathopod 2, 4" joint bluntly produced, masking the small 5", 6th Jarge, broadly oval, palm convex, 702 Podocerus slightly distinguished from the hind margin by a minute tooth or notch, with 2 palmar spines; finger matehing palm. Peraeopods 1 and 2, 24 joint with convex front margin forming a winged expansion. Peraeopods 3—5, 29 joint expanded behind in peraeopod 3 just as in front of the 1% and 24, in 4 and 5tk with more flattened hind margin. Pleopods 1—3, coupling spines reaching 9. Telson rather broader than long, distally rounded ; projeetion from upper surface broad, earrying 2 spines. Colour, dark stellate marking or round spots, scattered or erowded. L. 6—7 mm. Atlantie. On Chelonia imbricata (L.). 2, P.andamanensis (Giles) 1890 Cyrtophium andamanense,. G. M. Giles in: J. Asiat. Soc. Bengal, v.59 p.72 t.2 f.7 | 1899 Podocerus andamanensis, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.239 | 1893 Platophium orientale (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 89. Body slightly corrugated, not carinate; peraeon segment 5 much shorter than the 1°, 24 or 7th, Eyes small. Antenna 1, 24 joint considerably longer than 1° or 34, or than the 4-jointed flagellum; accessory flagellum minute, with 4 short joints (?). Antenna 2 much longer and stouter; ultimate joint of peduncle subequal to penultimate (in figure longer), flagellum very short, with 2 stout long joints, armed with strong hooked spines. Gnatho- pod 1 very small; the articulation between 3% and 4" joints very oblique; finger probably fused with 6" joint, the subchela being formed between these and the dilated 5! joint. Gmathopod 2 very much larger; 4 joint not produced (figure), 5t" coalesced with the long oval or fusiform 6, which is devoid of long setae; finger strongly curved, little more than half, as long as 6th joint. Peraeopod 3 as long as peraeopods 1 and 2, but stouter; peraeopods 4 and 5 successiwely longer. Pleopods L—3 exceptionally - small. Uropod 1, peduncle as long as the longer ramus; the shorter ramus scarcely more than half as long. Uropod 2 shorter but stouter, its rami in like manner unequal and spinose. Uropod 3 reduced to a rudimentary tuberele. Telson small and laminar, armed with a few short, stiff hairs. Colour dirty white, sparely sprinkled with minute dark brown spots. L. 3 mm. Bay of Bengal (Andaman Islands). Taken in the surface net. 3. P. ineonspicuus (Stebb.) 1888 Platophium inconspiceuum, T. Stebbing in: Rep. Voy. Challenger, v.29 p.1194 t.131 | 1899 Podocerus inconspicuus, T. Stebbing in: Ann. nat. Hist., ser. 7 v.8 p.239 | 1893 Platophium parasiticum (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 335. Q. Body elliptical, slightly imbricated. Eyes broadly oval, large. Antennae 1 and 2 imperfect. Gmathopod 1, 5! joint elongate, narrowing distally, rather longer than 6tt, 6!" widening to the palm, which is shorter than the hind margin and forms an obtuse angle with it, earrying’a palmar spine; the finger not overlapping palm, with a row of setules near the apex. Gnathopod 2, 5th joint small, 6% large, abruptiy wider than 5%, hind margin very short, palm very long, oblique, defined by a small apical tooth, serrulate near finger-hinge, and then fringed with stout spines; finger stout, matching palm. Marsupial plates of great size. Peraeopods 1—5 unknown. Pleo- pods 1—3 each with 2 coupling spines. Uropod 3 not reaching end of telson. Telson distally rounded, with 2 spines rising from the surface at about the centre. Colour, dark pigment flakes, remaining dark in spirit. L. about 3 (not 6) mm. — S unknown. Port Jackson [East-Australia]. Depth 3—18 m. Se Ey < Da FE 4 Zune w a Zu ist ie ee Podoeerus _ 708 4. P. lobatus (Hasw.) 1885 Dexiocerella lobata, Haswell in: P, Linn, Soe, N.S. Wales, 0.10 p.110 t.18 f,6—8 | 1888 COyrtophium lobatum, Chevreux & Guerne in: C.-R. Ac. Sei., v.106 p.627 | 1888 Platophium I., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1184 | 1899 ‚Podocerus lobatus, T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p. 239 | 1893 Platophium orientale (part.), A. Della Valle in: F, Fi. Neapel, v.20 p. 338. Segments 1—4 elevated in the medio-dorsal line. Antenna 1, 34 joint of pedunele rather shorter (in figure rather longer) than 24; flagellum a little longer than 39 joint of pedunele, 5 (in figure 6)-jointed; accessory flagellum 1-jointed. Antenna 2 as long as the body, stout; penultimate joint of peduncle narrow at; base, then broad, ultimate considerably longer, flagellum about half as long as ultimate joint of peduncle, with 3 joints, 1° much longer than 24 and 34 combined. Gmnathopod 1 as in Cyrtophium minutum (p. 698). Gnathopod 2 very large, 4 joint with apex of hind margin acutely produced, 6® large, irregularly ovoid, not twice as long as the greatest breadth, hind margin very short, palm defined by a strong tooth, and having near the finger-hinge a denticulated lobe, followed by a conical tootb, as in various other species. Peraeopods 1—5 unknown. Uropods 1—3 and telson as in P. eristatus (p. 706). L. about 4 mm. South-Paeifie (Broughton Islands near Port Stephens [East-Australia]). 5. P. chelonophilus (Cheyreux & Guerne) 1888 Oyrtophium chelonophilum, Chevreux & Guerne in: ©.-R. Ace. Sei., v.106 p. 626 | 1893 Platophium e. (part.), Chev- reux & Guerne in: Bull. Soc. ent. France, p. 118 | 1899 Podocerus chelonophilus (part.), T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.239 | 1893 Platophium brasiliense (part.), A. Della Valle in: F, Fl. Neapel, v.20 p. 329. Body elliptical, dorsally smooth, not atall imbricated. Head reetangular, much broader than long. Eyes round, prominent, Antenna 1 very short, ?/, as long as antenna 2; flagellum not longer than 34 joint of peduncle, 6-jointed; accessory flagellum l-jointed. Antenna 2 very robust; flagellum searcely half as long as ultimate joint of pedunele, 3-jointed. Gnathopod 1 in d, 6 joint triangular, hind margin almost at right angles with palm. Gnathopod 2 in G, 6!" joint very large, oval, having on the hind margin (which is undistinguished from the palm) a sharp tooth followed by 2 great dentieulate tubereles; finger stout, strongly curved, shorter than hind margin. Gnathopodl in © as in Cd, but smaller. Gnathopod 2 in Q, 6% joint short, rounded, as broad as long, hind margin smooth; finger slender, regularly eurved. Peraeo- pods 3—5 large, robust, suecessively longer; 24 joint short, oval, searcely expanded behind. Telson squamiform, a little broader than long. L. Q 7 -© 9 mm, North-Atlantie (Azores). On Thalassochelys caretta (L.). 6. P. variegatus Leach 1813/14 P. v., Leach mn: Edinb. Ene., v. 7 p. 433 | ?1836--40 P.v., H. Milne Edwards in: G. Cuvier, Regne an., ed.3 Urust. p. 179 t. 61 f.4 | 1899 P.v., T. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.237, 350 | 1857 Cyrto- phium darwinii, Bate in: Ann. nat. Hist., ser.2 v.19 p. 148 | 1862 C. d., Bate, Cat. Amphip. Brit. Mus., p.274 t.46 f.8 | 1874 C.d., T. Stebbing in: Rep. Devonsh. Ass., v.6 p.770 | 1888 Platophium d., T. Stebbing in: Rep. Voy. Challenger, v.29 p.292 | 1893 P. brasiliense (part.), A. Della Valle in: F. Fl. Neapel, 0.20 p.829 t.2 f.7; t.7 £.39—58 | 1894 Laetmatophilus tuberculatus (part.), G. O. Sars, Crust. Norway, v.1 p. 630. Near to P. brasiliensis (p. 704), but body more strongly eorrugated or imbricated, and more broadly elliptical in 9. Antenna 1, 24 joint very little longer than 34; flagellum with 6 joints earrying numerous hyaline filaments in S, with 4 jointsin 9; accessory flagellum 1-jointed.. Antenna 2 large in J; 704 Podocerus ultimate joint of peduncle very elongate; flagellum with 4 joints, the 1% much the longest. Gmathopod 1 as in P. brasiliensis, but in both sexes less robust. Gnathopod 2 in J, 6#k joint with the front margin more convex than in P. brasiliensis, and the opposite margin armed near the finger-hinge with a broad denticulate process, followed by a strong tooth; the plumose setae as in the species compared; finger reaching nearly to the base of the 6*% joint. Gnathopod 2 in Q, 4 joint with a broader apex, 6th rather less broad, finger longer than in P. brasiliensis. Pleopods with 5 coupling spines. Colour dark red, not rarely with a brilliant patch of purple or lilae on the back. L. 3—4 mm. North-Atlantie (South-West-England, West-France); Mediterranean (Naples, Adriatie). 7. P. brasiliensis (Dana) 1853 & 55 Platophium brasiliense, J.D. Dana in: U.S. expl. Exp., v.13u p.838; t.55 f.9a—l | 1888 P. b., T. Stebbing in: Rep. Voy. Challenger, v.29 p.265 | 1893 P. b. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.329 | 1899 Podocerus brasiliensis, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p. 239. Body not carinate, in JS narrowly, in © more broadly, elliptical. Antenna 1, flagellum with 4 (Dana: 3—5) joints, together about as long as 24 joint of peduncle. Antenna 2, ultimate joint of pedunele very long; flagellum with 4 joints, each with curved spine at apex, 4tk joint very small, its eurved spine the strongest. Gmnathopod 1 stronger in J than in O; 5tk joint shorter than 6'" in JG, not in Q, in each forming a broad lobe at middle of hind margin, 6! with very short hind margin, abruptly widening to the long sloping palm; 4!k—6th joints armed with numerous spines on and about the hind margin, 6 with several rows on surface adjoining front; finger matching palm, curved, serrate. Gmathopod 2 in Cd, 4" joint scarcely at all produced at distal hind corner, 5" small, scarcely distinet from 6th, 6th very long (not short), narrowly oblong oval, fringed along the straight hinder edge, which is palm and hind margin all in one, with very long plumose hairs; the erenulation near the finger-hinge almost obsolete; finger more than half as long as 6% joint. Gnathopod 2 in ©, 4% joint considerably produced at the hinder apex, 5" small, triangular, but quite distinet, 6" not very long, broadly oval, the palm defined from the short hind margin by 2 slender prominent spines, the joint armed with numerous seta-like spines but no plumose setae. Peraeopods 1—5, 6!" joint spinose on both margins, - on the front the strong spines being on the lower half; finger eurved, strong. Peraeopods 3—5, 24 joint narrow, and narrowing distally. Pleopods 1—3 with only 2 coupling spines. Uropod 3, ramus very small. Telson with 8 spines radiating round the projeceting distal margin. L. 6 mm. Tropieal Atlantic (Rio Janeiro, Antigua). 8. P.laevis (Hasw.) 1885 Dexiocerella l., Haswell in: P. Linn. Soc. N. S. Wales, v.10 p.111 t.18 f.10—12 | 1888 Platophium laeve, T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1184 | 1899 Podocerus laevis, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.239| 1888 Oyrtophium haswelli, Chevreux & Guerne in: Ü©.-R. Ac. Sei., v.106 p.627 | 1893 Platophium parasiticum (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 335. Body smooth, elliptical inQ. Antenna 1, 34 joint of peduncle very little shorter than 24; flagellum 5- or 6-jointed; accessory flagellum very small, 1-jointed. Antenna 2 nearly as long as body in d, ing much shorter; pedunele very stout, ultimate joint as long as 2 preceding joints together (in J, not so long in Q); flagellum "/, as long as ultimate joint of peduncle, with 3 indistinet joints (Haswell), in @ more than half as long as Podocerus 705 ultimate joint of peduncle, with a minute 4% joint. Mandible, 34 joint of . palp very broad-ended. Gnathopod 1, 5t" joint with the hind lobe very broad, 6th in S, but not in Q, rather longer than 5*", hind margin very short, at a deeided angle with palm, which is not defined by a tooth; finger as usual dentieulate; front margin of 6! joint more strongly spined in © than in d. Gnathopod 2 in G, 4th joint produced at apex of hind margin in- to a short tooth; 5tk joint obscurely separated from the large oval 6, of which the palm is serrulate towards finger-hinge and indistinetly defined from the short hind margin by a small notch and spine, which is scarcely reached by apex of finger, the fringing setae not very long. Gnathopod 2 in Q, 4 joint with tip truncate, 6tk more broadly oval than in JS; palm more convex, not serrulate, defined by a little tooth and strong group of spines. Peraeopods 1—5 stout, with strong, eurved finger; inner margin of 6tk joint having the strong spines on the upper half. Peraeopods 1 and 2, 24 joint with very inconspicuous dilatation. Peraeopods 3—5, 24 joint well expanded. Pleopods 1—3 each with 2 coupling spines. Uropods 1 and 2, rami ‚rather less elongate than usual. Uropod 3, the plate not reaching end of telson. Telson, the upper process conical, rather strongly produced, tipped with 2 spinules. L. 8 mm, or less. Port Molle, among sea-weed, and Maroubra Bay [East-Australia]. 9. P. danae (Stebb.) 1888 Platophium d., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1185 t.128, 129 | 1899 Podocerus d., T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 .p.239 | 1893 Platophium orientale (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.332 t.55 £. 17, 18. In the medio-dorsal line from head to 34 pleon segment extends a series of carinate teeth or processes, 2 small ones on peraeon segment 1, Te — a 2 a 7% 5A ER Ä/ 4 Kr IN, \ x = l S > y | | 2 V Fig. 122. P.danae. Lateral view. thence tending to encrease successively, 1 to each segment; lateral margins of peraeon projecting, on segments 3—6 tridentate; peraeon segment 7 and . pleon segments 1 and 2 each with lateral tooth on hind margin. Head Das Tierreich. 21.Lief.: T.R.R. Stebbing, Amphipoda I. 45 706 Podocerus, Ieilius truncate in front (Fig. 122 p. 705). Eyes very prominent. Antenna 1, flagellum with 8—10 joints earrying many hyaline filaments, together longer than 24 joint of pedunele; accessory flagellum 1-jointed. Antenna 2, ultimate joimt of pedunele very long; flagellum slender, with 4 joints, the 1% much longer than the other 3 united, all 4 together subequal to penultimate joint of pedunele. Gnathopod 1 slight, 5tP joint fully as long as 6t%, general structure as in P. brasiliensis (p. 704). Gnathopod 2 in 9, 4tk joint slightly but bluntly produced, 5tk distinet, triangular, short, 6% thrice as long as 5tk, or as its own breadth, with no distinetion between hind margin and palm, the two closely fringed with rather long plumose setae, and broken into 2 or 3 teeth near the hinge of the setuliferous finger, which is about half as long as 6! joint, eurved and stout. Gnathopod 2 in Q, 4% joint little and not acutely produced, 6% broadly oval, palm defined from the short hind margin by an acute tooth and strong palmar spine, against which the broad curved finger impinges. Peraeopods 1—5 nearly as in P. brasiliensis, but the finger fringed with a few setules on the convex margin. Pleopods 1—3 each with 2 eoupling spines. Uropod 3, the concave plate bordered with 6 or 7 spinules. Telson with bluntly eonieal projection from its upper surface not quite reaching its distal margin; apex of the cone tipped with 2 spines. L. about 14 mm. Southern Indian Ocean (Kerguelen Island). Depth 232 m. 10. P. eristatus (6. M. Thoms.) 1879 Oyrtophium eristatum, &. M. Thomson in: Ann. nat. Hist., ser.5 v.4 p.331 t.16 £.9—15 | 1881 ©. c., G. M. Thomson in: Tr. N. Zealand Inst., v.13 p.219 t,8 f.8 | 1888 Platophium e., T. Stebbing in: Rep. Voy. Challenger, v.29 p.500 | 1899 Podocerus eristatus, T. Stebbing in: Ann. nat. Hist., ser. 7 v.3 p.239 | 1879 Cyrtophium dentatum, Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.342 t.22 £.5 | 1885 .Dewiocerella dentata, Haswell in: P. Linn. Soc. N.S.Wales, v.10 p.109 t.17 f.8—12 | 1893 Platophium orientale (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.332 In elose general resemblance to P. variegatus and P. brasiliensis (p. 703, 704). Peraeon segments 6 and 7 and pleon segments 1 and 2 each with carinate process in medio-dorsal line. Antenna 1, flagellum 6—8-jointed, accessory ‚Nagellum 1-jointed (Haswell 1879: biartieulate, and 1885: consisting of several coalescent joints). Antenna 2, flagellum with 3 joints, the last tipped with a strong spine. Gnathopod 2 in JS, 4% joint with apex of hind margin acutely produced, 6% having near the finger-hinge a denticulate lobe followed by aconicaltooth, which like the lobe is of variable size; finger nearly reaching base of 6 joint. Peraeopods 3—5 with 29 joint slightly broader than in the other species. Pleopods 1—3 each with 2 coupling spines. Telson eonical, tipped at the apex with 2 spinules in juxtaposition. Colour grey or red. L.5—6 mm. Southern Indian Ocean and South-Paeifie (Dunedin Harbour [New Zealand], depth 7—9 m; eastern and southern Australia). 6. Gen. Icilius Dana 1849 Ieilius, J. D. Dana in: Amer. J. Sei., ser.2 ©.8 p.140 | 1852 I. (Sp. un.: T. ovalis), J. D. Dana in: P. Amer. Ac., v.2 p.220 | 1886 J., Gerstaecker in: Bronn’s Kl. Ordn., v.511 p.497 | 1888 7., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1202 | 1893 I., A. Della Valle in: F. Fl. Neapel, 0.20 p. 327, 344. Body (Fig. 123) depressed, wide at the middle; pleon segments 3—6 folded ventrally. Head with lateral lobes very prominent. Side-plates of various shapes, 1° and 24 the smallest, 4 and 5tk the largest, none very deep. Antenna 1 much the shorter; accessory flagellum very small. An- tenna 2, pedunele and flagellum elongate. Upper lip faintly emarginate. 1 Zr ea 2 ‚neath which there is a ‚spiniform process. Side- ‚and 2, postero-lateral cor- leilius 707 Lower lip, mandibular processes short, obtuse. Mandible normal; 39 joint of palp not longer than 24, Maxilla 1, inner plate with 2—4 setae on narrow apex, outer with 11 spines; 24 joint of palp with numerous spines and spine- teeth. Maxilla 2, inner plate the shorter, inner margin only partially fringed; both plates broad, rather short. Maxillipeds, inner plates broad, outer not very large, fringing spines slender; 24 joint of palp broad, finger slender. Gmathopods 1 and 2 (Fig. 124) simple, slender; 5! and 6! joints elongate, fringed with long setae. Peraeopods 1—5, 24 joint not widely expanded; peraeopod 5 longest. Branchial vesieles simple. Marsupial plates long and broad. Uropod 3, inner ramus longer than pedunele (Fig. 125), outer not longer, very small. Telson simple. 1 species. 1. I. ovalis Dana 1852 I.o., J.D. Dana in: P. Amer. Ac., v.2 p.220 | 1888 I. o., T. Stebbing in: Rep. Voy. Challenger, v.29 p.255, 265, 1706 | 1893 I. o., A. Della Valle in: F. Fl. Neapel, v.20.p.345 t.55 f. 25—81 | 1853 & 55 I. elliptieus, J. D. Dana in: U. S. expl. Exp., v.13u p.844; t.56 f.4a—g | 1879 I. australis + I.punctatus, Haswell in: P. Linn. Soe. N.S.Wales, v.4 p. 274 t.12 f.2; p.343 t.23 f.1 | 1882 I. a., Haswell, Cat. Austral. Crust., p. 275.4 f.4, a,b | 1888 I. danae + 1. ellipticus + I. a., T. Stebbing in: Rep. Voy. Challenger, v.29 p.1203 t. 133; p. 1208, Back broadly oval (Fig. 123), peraeon segments 1 and 2 very short, pleon segments 1—3 medio-dorsally acutely produced (Dana); peraeon segment 7 and pleon-segments 1 and 2 with 2 sets of submedian spinules (sometimes produeing the effect of median processes). Head broader than long, with small rostrum x and little lobe above the che Semer rounded ocular lobe, be- plates 1 and 2 very small, hind margin pointed, 33° and4h withbluntly pointed °* Joint 74 spinulose hind apex, 5th 7 bilobed. Pleon segments 1 ners sharply pointed, the Be margin above produced in- to a2 acuteprocess;: Pleon segment 3smaller,postero- lateral cormers ineurved, acute. Eyes prominent, hemispherical, red. An- tenna 1, 1°t and 24 joints subequal, 3% much shorter; 4% joint flagellum rather longer BE 1m, DUB than pedunele; accessory Fig. 128—125. I, ovalis. Fig. 123. Dorsal view of 2. — Fig. 124. Gnatho- flagellum a small oblong pod 2. — Fig. 125. Dorsal view of pleon. joint, tipped with 2 setae. Antenna 2 about twice as long as 1%, as long as body; ultimate joint of pedunele longer than penultimate; flagellum much longer than elon- gate peduncle.e. Gnathopods 1 and 2 (Fig. 124), 3% and 4 joints very short, 5!k very long, longer than 24, slightly tapering, more in gnathopod 2 45* r ; 708 Jeilius, Dulichia + than in 1°; 6b joint longer than 24, slightly shorter than 5th, of uniform narrowness; finger half as long as 5#» joint, inner margin setuliferous. Peraeo- pods 1 and 2 robust, more so in J than Q, spinose; 4% joint very short, 5th subequal to the short 24, 6th Jonger, in GC decidedly, in Q less decidedly, subchelate; the finger elosing against a little spinose palm or widened apex of 6th joint. Peraeopods 3 and 4 equal, similar to preceding peraeopods but without palm; 24 joint channelled behind, outer margin cut distally into 2 teeth. Peraeopod 5 much longer, 24 joint somewhat expanded behind with a proximal lobe, distally as in peraeopods 3 and 4. Pleopods 1—3, peduncle rather short and broad. Uropods 1 and 2, outer ramus the shorter, both spinose, finely pectinate; peduncle longer than rami in uropod 1, subequal to longer ramus in uropod 2. Uropod 3, peduncle short, produced obtusely on inner side; inner ramus rather long, outer short, narrow (not shown in Fig. 125 p. 707). Telson subaeute, rather longer than broad. Colour, covered with minute red or grey spots. L. (distended) about 9 mm. Balabac Passage (north of Borneo), depth 56 m; Port Jackson [East-Australia], on calcareous sponges; Port Phillip (Melbourne), depth 60 m. 7. Gen. Dulichia Kroyer 1845 Dulichia (Sp. un.: D. spinosissima), Kreyer in: Naturh. Tidsskr., ser.2 o.1 p. 512, 521 | 1888 D., T. Stebbing in: Rep. Voy. Challenger, v.29 p:213 | 1893 D., A. Della Valle in: F. Fl. Neapel, v.20 p.320 | 1894 D., G. O. Sars, Crust. Norway, v.1 p: 634 | 1857 Dyopedos, Dulichia, Bate in: Ann. nat. Hist., ser.2 v.19 p.150, 271. Body (Fig. 126 p. 712) slender; peraeon segment 1 the shortest, 6th and 7th coalesced. Pleon of only 5 segments besides the telson, the 4th elongate. Head produced in front. Side-plates small, not contiguous. Antennae 1 and 2 long and slender, peduncle much longer than flagellum. Antenna 1 the longer; accessory flagellum very small. Upper lip slightly bilobed. Mandibular palp not very large, 39 joint narrow. Maxilla 1, inner plate small. Maxilla 2, inner plate fringed on inner margin. Gmnathopod 1 not subchelate, 5tk joint larger than 6%, Gmathopod 2 in J subchelate, 6!" joint powerful. Gnathopod 2 in oO similar to gnathopod 1, but with shorter 5% joint. Peraeopods 1 and 2 small, 24 rather longer than 1%. Peraeopods 3—5 stronger, rather or very long, peraeopod 5 the longest; 24 joint linear, 4 elongate. Branchial vesicles narrow, usually on gnatho- pod 2 and peraeopods 1—3. Marsupial plates very broad, especially the 2 middle ones. Pleopods large; peduncle long and strong. Uropods 1 and 2 with narrow, linear, unequal rami. Uropod 3 entirely wanting. Telson oval. 10 species. Synopsis of species: N VE 3 ae: 9 spinosissima . P-.709 No peraeon and pleon segments with dorsal pro- Some peraeon and pleon segments with dorsal | jeetions — 2. form — 8. | Side-plate l ind produced forward in spine-like 2 | Side-plate 1 ind without spine-like projeetion — 4. YO a ee a IE FE I aa! De ı{! ee re Rt pr ae ee, ya ee Er „ x - Dulichia 709 Peraeopods 1 and 2, * joint not produced into ee a 2. D. monacantha . p.710 Peraeopods 1 and 2, 2d joint produced into a tooth 3. D. arctica. . . . p. 710 3 vg without visual elements — 5. Eyes with visual elements — 6. Gnathopod 2 ind, defining tooth of palm at right angles to long axis of the 6th joint... . . 4. D. macera . . . p.710 Gnathopod 2 ind, defining tooth of palm not at right angles to long axis of the. 6th joint . . 5. D.hirticornis. . p. 711 4 5 Eyes not very small — 7. Gnathopod 2 ind, 6th joint without thumb-like DERFORSE: DORIS DRS 2 ae ne Re 7. D. nordlandica . p.711 Gnathopod 2ind, 6th joint with thumb-like process near base — 8. Gnathopod 2 in d, 6th joint with thumb-like rose Bomborteil rn. ee ee 8. D. falcata. . . . p.712 Gnathopod 2 in d, 6th joint with thumb-like process not contorted — 9. 8 Gnathopod 2 ind, finger very long . .... . 9. D. porrecta. . . p.712 be Gnathopod 2 ind, finger not very long . . . . 10. D. tuberculata . p.713 6 | N RE ER RS 6. D.normani. . . p. 711 1. D. spinosissima Kroyer 1845 D.s., Kroyer in: Naturh. Tidsskr., ser.2 v.1 p-512 t.6 f.la—h | 1846 D. s., Kreyer in: Voy. Nord, Crust. t.22 f.la—n | 1876 D.s., A. Boeck, Skand. Arkt. Amphip., v.2 p.651 | 1893 D.s., A. Della Valle in: F. Fl. Neapel, v.20 p.324 t.55 f.15,16 | 1894 D.s., G. O. Sars, Crust. Norway, v.1 p.635 t. 228. Peraeon segments produced to acute lateral points; last peraeon- segment and pleon segments 1 and 2 each with a pair of tubercular medio- dorsal prominences; pleon segment 3 produced backward in a long slightly curved tooth. Head very large; carina produced to a lamellar acute-ending rostrum; post-antennal corners acutely produced. Side-plates projeeting acutely forward, 24 acutely bilobed, 34 and 4th acute below. Eyes large, prominent, acute at centre, dark red. Antenna 1 densely setose (setae not very long), nearly as long as the body (Kreyer: about 1'/, of body); 24 joint more than twice as long as 1°, obtusely produced at apex, 34 rather longer, as long as the 5-jointed flagellum; accessory flagellum 3-jointed. Antenna 2 shorter and narrower, ultimate and penultimate joints of peduncle each obtusely produced at apex, flagellum shorter than ultimate, 3-jointed. Gmathopod 1, 5!" joint very setose on hind margin, narrowing distally, longer and rather broader than the setose 6t%, which slightly widens distally; finger long, dentieulate on inner margin. Gnathopod 2 in 3, 24 joint produced in front to a triangular distal lobe, 5tk cup-shaped; setose on hind margin, 6! broad, oval quadrangular, hind margin pretty well developed, palm defined by a strong tooth, and having a smaller one near the finger-hinge; finger strong, densely setose, overlapping palm. Gmnathopod 2 in © less powerful; 6! joint rather broadly oval, without teeth. Peraeopods 1 and 2 small and feeble; 24 joint very little dilated. Peraeopods 3—5 long, strong; 4 joint subequal to 5th and 6! combined, which are densely spinose; finger strong. Uropods 1 and 2, rami narrow, acute, spinose. Telson rather longer than broad, with 2 setules on each side, apex narrowly rounded. Colour whitish, pellueid, with irregular brown and light yellow markings. L. © 12—31 mm. Arectie Ocean (Greenland, Spitzbergen, Finmark, Tromsö). Depth 20-300 m. 710 Dulichia 2. D. monacantha Metzg. 1875 D. m., Aug. Metzger in: Jahresber. Comm. D. Meere, v.2/3 p.296 t.6 f.8a, b | 1888 D. m., T. Stebbing in: Rep. Voy. Challenger. v.29 p.445 | 1894 D. m., G.O. Sars, Crust. Norway, v.l p.638 t.230 f.1 | 1893 D. tuber- culata (part.), A. Della Valle in: F. Fl. Neapel, v.20 p. 321. Body nearly as in D, porreeta (p. 712), especially in ©, perhaps rather more robust in d. Head very slightly produced in front. Side-plate 1 in C produced forward in long horn-like process, in Q small, subquadrate. Side-plate 2 much larger in J than in ©, broadly quadrate with blunt front corner. Eyes perhaps a little smaller than in D. porrecta, and antennae 1 and 2 rather less long, but in general as in that species. Gnathopod 1 as in the species compared, but gnathopod 2 in J not nearly so slender and elongate; 5th joint rather massive, 6% only a little longer than 5%, palm rather short, defined by a long tooth, the cavity between that and the tooth near finger-hinge being deep but not wide; finger of moderate length, over- lapping palm, with a tuberele on inner margin very near the hinge. Peraeo- pods 1—5 as in D. porrecta. Uropod 1, peduncle armed on outer margin only with 4 distant spines. Colour light yellowish, variegated with dark brown. L. 5—7 mm. Aretie Ocean and North-Atlantie (Finmark, depth 38—95 m; West-Norway); Skagerrak, depth 217 m; Kattegat (Great Belt and Aarhus Bay, depth 12—21 m). 3. D. aretica J. Murdoch 1885 D.a., J.Murdoch in: P. U. S. Mus., v.7 p.521 | 1893 D. tuberculata (part.). A. Della Valle in: F. Fl. Neapel, v.20 p. 321, Body smootb. Head slightly produced, forming an obtuse angle. Side- plate 1 produced into a sharp spine projecting forward, the rest unarmed. Eyes small, round, black. Gmnathopod 2, 24 joint dilated and armed with 2 teeth, 6tk large, subtriangular, and armed on the edge with 2 long stout teeth. Peraeopods 3—5 not speeially long; 4 joint as long as 5tk and 6tk combined. Uropod 2, outer ramus nearly twice as long as peduncle, inner a little longer. Colour greyish. L. ?. Arctic Ocean (Alaska). Depth 9 m. 4. D. macera 0. Sars 1879 D.m., G.O.Sars in: Arch. Naturv. Kristian., ©. 4 p.464 | 1885 D. m., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.220 t.18 f.2, 2a | 1898 D. m., A. Della Valle in: F. Fl. Neapel, v.20 p. 322 t.55 f. 11. Body very slim, unarmed. Peraeon segment 1 very short, the rest longer, subequal. Head rather small, obtusely eonical. Side-plate 2 the largest, but all small, wide apart. Eyes rudimentary, represented only by an irregular aggregation of white pigment on each side of head. Antenna 1 probably much longer than body; flagellum 6-jointed; accessory flagellum 6-jointed, Antenna 2 rather longer than the body, densely setose with short setae; . flagellum longer than ultimate joint of pedunele, 5-jointed. Gnathopod 1 slight, Stk joint longer and stouter than the slenderly oval 6%. Gmnathopod 2 in C almost completely unarmed; 24 joint proximally very narrow, distally rather dilated, 5!" longer than broad, 6 oblong oval, with process standing out at right angles to its long axis close to base, at distal end having a sharp tooth, finger strong, faleiform, not reaching the basal process. Peraeopods 1 and 2, 24 joint linear. Peraeopods 3 and 4 (and 5?) very long and slender, 4*% joint much longer than 5tk and 6th combined; finger apparently weak. Colour whitish, translucent. L. 10°5 mm. Arctic Ocean (north of Vesteraalen Islands; between Bear Island and Finmark, depth 842—1638 m). In the cold area. Duliechia zıı 5. D. hirticornis O.Sars 1876 D.h., G.O.Sars in: Arch. Naturv. Kristian., v.2 p.261 | 1885 D.'h., 6. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.218 t.18 £.1,1a | 1898 D.h., A. Della Valle in: F. Fl. Neapel, 0.20 p.523 t.55 f.13 | 1895 D. hirsuticornis, G. O. Sars, Crust. Norway, v.1 p. 700. Body robust, somewhat depressed, smooth. Peraeon segments 1 and 2 ‘ short; the rest longer, subequal. Head not strongly produced, obtusely conical. Side-plates all very small, squamiform, subequal. Eyes very small, not prominent, rounded oval, oblique, with a very light whitish yellow pigment. - Antenna 1 robust, as long as body, densely setose with long setae; 39 joint of pedunele longer than 24, or than the 4-jointed flagellum; accessory flagellum very small, 3-jointed. Antenna 2 shorter and more slender, but armed like the 1°; ultimate and penultimate joints of peduncle subequal; flagellum shorter than in antenna 1. Gmathopod 1 very setose; 6!" joint about as long as 5b, narrowly oval. Gnathopod 2 in d, 6fk joint very setose, hind margin running out into a long palm-defining tooth, separated by a deep and rather wide interval from the smaller tooth near hinge of the strong, somewhat sinuous finger. Gnathopod 2 in Q like gnathopod 1. Peraeopods 1 and 2, 24 joint somewhat dilated. Peraeopods 3—5 subequal, robust, not very long, finger strong, faleiform. Colour nearly translucent, with faint yellowish pigmentation. L. © 11 mm. Arctic Ocean and North-Atlantie (north-west of Stat, far from coast; near Storeggen Bank; north-west of Finmark). Depth 775—1165 m. 6. D. normani O.Sars 1895 D.n., G. O.Sars, Crust. Norway, v.1 p.699 t.VIIL f.2| 1895 D. n., A. M. Norman in: Ann. nat. Hist., ser. 6 v.15 p. 49. 9. Body rather slender, quite smooth. Peraeon segments successively longer to the 4", Head angularly produced in front. Side-plates all very small. Eyes extremely minute, though well developed and with dark pigment, Antenna 1 rather strong, very long, densely fringed with long setae; 34 joint of peduncle much longer than 24, longer than the 5-jointed flagellum; accessory flagellum minute, 3-jointed. Antenna 2 armed like antenna 1, somewhat shorter; ultimate and penultimate joints of pedunele subequal. Gnathopods 1 and 2 apparently as in D. porreeta (p. 712). Peraeopods 1 and 2, 24 joint expanded, between oval and fusiform. Peraeopods 3—5 not very long nor very spinose. Colonr in spirit simply greyish white. L. 5 mm. Trondhjemsfjord. 7. D. nordlandica Boeck 1871 D.n., A. Boeck in: Forh. Selsk. Christian., 1870 p.263 | 1876 D. n., A. Boeck, Skand. Arkt. Amphip., v.2 p.658 t.29 £.11 | 1898 D.n., A. Della Valle in: F. Fl. Neapel, v.20 p.824 t.55 f.14 | 1894 D.n., G. O. Sars, Crust. Norway, v.1 p.641 t. 231 f.2; t. 232 £.1. Body extremely slender, long, smooth. Head“not very large, not much produced. Side-plates all very small. Eyes without visual elements, represented by patch of white pigment on each side. Antennae 1 and 2 extremely slender and long, setose with short setae. Antenna 1 longer than the body; flagellum in S with 5 joints, in © with 4. Gnathopod 1, 4b joint longer than usual, 5th longer than the fusiform 6", Gmathopod 2 in J, 24 joint dilated only in distal half, 5th joint short, 6% with front margin very convex, hind slightly concave, distally produced to a sharp tooth with smaller one between it and hinge; the finger far overlapping both, with tuberele at its base, its apex reaching the 5tk joint or nearly. Gnathopod 2 in Q like gnatbopod 1, but with 5 joint not longer than 6%, Peraeopods 1 and 2, 712 Dulichia 24 joint narrow. ten 3—5 very slender and long; peraeopod 5 scarcely longer than the 2 preceding, its 6! joint much longer than the 5th, slightly expanded at base and armed with a row of strong spines. Uropod 2, peduncle more than half as long as peduncle of uropod 1. Colour pellueid, pale yellowish. L. 5 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Lofoten Islands; South- and West-Norway). Depth 188—565 m. 8. D. falcata (Bate) 1857 Dyopedos falcatus, Bate in: Ann. nat. Hist., ser, 2 v.19 p.151 | 1862 Dulichia falcata, Bate, Cat. Amphip. Brit. Mus., p.348 t.54 f.10 | 1876.D. f., A. Boeck, Skand. Arkt. RT Amphip., v.2 p. 652 t.29 AIR N f.10|1894.D. f., G.O ‚Sars, EN nn IS ER Q Crust. Norway, v.1 p. 640 NR 8 t.231 f.1 | 1893 D.porrecta \ @ 2, f 4 ER N ar Cr Y\ (part.). A. Della Valle in: N IN F. Fl. Neapel, v.20 p. 322. EN Body (Fig. 126) ) slender, long, smooth. Head somewhat pro- Fig. 126. D. falcata, 3. Lateral view. duced in front. Side- ae esgder: plate 1 verysmall, quad- rate, 24 rather larger in JS than in Q, slightly bilobed. Eyes very large, rounded, dark red. Antenna 1 slender, much \ "longer than the body; flagellum subequal to ultimate joint of peduncle, 5-jointed; accessory flagellum minute, 3-jointed. An- tenna 2 much shorter, like the 1° slender and feebly setose; flagellum shorter than ultimate joint of peduncle Gnathopod 1, \ 5th joint longer and stouter than the narrowly oval 6%, which is \ setose on both margins. Gmnathopod 2 in J, 24 joint expanded in front to a rounded distal lobe, 5tk rather longer than broad, 6th forming near the base a contorted outstanding 'thumb-like process, the acute apex of which meets the point of the finger; the slightly concave remainder of the long palm running parallel with the «convex front margin and ending in a sharp tooth near the tubercle of the finger. Gnathopod 2 in O, 5#" joint rather shorter than 6%, dilated at middle of hind margin, otherwise resembling gnathopod 1. Peraeo- pods 1 and 2, 24 joint scarcely expanded. Peraeopod 5 notably Jonger than peraeopods 3 and 4; its 5th joint much ‚longer than the 6%, Uropod 1, peduncle nearly smooth. Uropod 2, peduncle fully half as long as peduncle of uropod 1. Colour whitish, pellueid, with dark elaret-red markings. L.6—8 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (Moray Firth; from Christianiafjörd to Vadsö [Norway]). Depth 37—94 m. 9. D. porrecta (Bate) 1857 Dyopedos porrectus, Bate in: Ann. nat. Hist., ser.2 v.19 p.151 | 1862 Dulichia porrecta, Bate, Cat. Amphip. Brit. Mus., p. 348 t.54 £.9| 1876 D. p., A. Boeck, Skand. Arkt. Amphip., v.2 p.658 t.30 f.2,3 | 1893 D. p. (part.), A. Della Valle in: F. Fl. Neapel, v.20 p.322 t.55 f.12 | 1894 D.p., G. O. Sars, Crust. Norway, v.1 p.637 t. 229. Body smooth, much more slender in S than in 0. Peraeon segment 1 much shorter than the rest. Head somewhat produced. Side-plate 1 small, quadrate, 24 Jarger in .J than in ©, the rest very small. Eyes rather large, ae rg Eee Dulichia, Paradulichia 713 a little prominent, rounded, dark red. Antenna 1 about as long as the body; 34 joint rather longer than 24, subequal to 5-jointed flagellum; accessory flagellum very small, 3-jointed. Antenna 2 rather shorter; flagellum sub- equal to ultimate joint of pedunele. Both antennae setose with moderately long setae. Gmathopod 1, 5! joint expanded somewhat at the base, longer than the narrowly oval 6%, Gmnathopod 2 in J very long; 24 joint long and slender, 5" small, longer than broad, 6 elongate, densely setose along palm, which is defined from the short hind margin by a very long tooth, widely diverging from the small one adjacent to the tuberele on inner and very setose margin of the very elongate finger. Gnathopod 2 in 9 as long as gnathopod 1; 5" joint only about half as long as 6tk, which is somewhat tapering; finger rather short. Peraeopods 1 and 2, 24 joint considerably dilated in the middle. Peraeopods 3—5 not very elongate, sparingly spinose. Uropod 1, peduncle minutely spinulose on outer margin; inner ramus considerably longer than outer, inner margin minutely spinulose between the spines. Colour whitish, pellueid, with narrow transverse brownish stripes. L. © 5, SO 6 mm. Arctie Ocean, North-Atlantie, North-Sea, Skagerrak and Kattegat (West-Green- land; Iceland; Lofoten Islands; South- and West-Norway; Danish waters; Shetlands; Scotland). Depth 7—113 m. 10. D. tuberculata Boeck 1871 D.t. + D. curticauda, A. Boeck in: Forh. Selsk. Christian., 1870 p.263, 264 | 1876 D.t.+ D.c., A. Boeck, Skand. Arkt. Amphip., v.2 p.655 t.30 £.4; p.657.t.29 f.9 | 1898 D.t.+ D.e., A. DellaValle in: F. Fl. Neapel, v.20 p.321 t.55 f.6—10; p. 325 | 1885 D.t., G. O. Sars in: Norske Nordhavs- Exp., v.6 Crust. I p.215 t.17 f£.6,6x | 1894 D. curticauda, G. O. Sars, Crust. Norway, v.1 p.689 t.230 f.2 | 1879 D. septentrionalis, G. O. Sars in: Arch. Naturv. Kristian., v.4 p.463. Body smooth. Head somewhat produced. Side-plate 1 small, quadrate, 24 little longer in J than in ©. Eyes large, rounded, convex, dark red. Antenna 1 about as long as body; flagellum longer than ultimate joint of pedunele; accessory flagellum minute, 3-jointed, middle joint much the longest. Antenna 2 much shorter. Both antennae sparsely setose with short setae. Gnathopod 1 as in D. porreeta. Gnathopod 2 in JS, 24 joint widened except at base, 5t% triangular, small, 6 very. large, produced not far from base to a narrow, acute, outward bent tooth; the palm thence forward concave, parallel: to convex front margin, and ending in a sharp tooth near the tuberele on inner margin of the short finger. Gnathopod 2 in O like gnathopod 1, except that the 5t" joint is not longer than the 6", and bulges at middle. Peraeopods 1 and 2, 24 joint very little expanded. . Peraeo- pods 3—5 elongate; 5tk joint of peraeopod 5 much longer than 6%. Uropod 1, pedunele with about 8 spines on outer margin. Uropod 2, peduncle scarcely half as long as peduncle of uropod 1. Colour whitish, with some reddish brown markings.. L. 9 5 mm. Arctie Ocean, North-Atlantie, North-Sea and Skagerrak (from Christianiafjord to Vadsö [Norway], in moderate depths; Spitzbergen; West-Greenland). Depth 19--28 m. 8. Gen. Paradulichia Boeck 1871 Paradulichia (Sp. un.: P.typica), A. Boeck in: Forh. Selsk. Christian., 1870 p-265 | 1876 P., A. Boeck,- Skand. Arkt. Amphip., v.2 p.660 | 1888 P., T. Stebbing in: Rep. Voy. Challenger, v.29 p.402 | 1893 P., A. Della Valle in: F. Fl. Neapel, v.20 p.319 | 1894 P., G. O. Sars, Crust. Norway, v.1 p. 642. 714 Paradulichia, Hyperiopsidae, Hyperiopsis Oo. In close agreement with Dulichia (p. 708), except that uropod 2 is quite rudimentary, peduncle and rami being represented by a single conically tapering joint (Fig. 127). Antennae not so elongate as in Dulichia. Maxilla 2 has the inner plate not fringed with setae on the inner margin. — SO unknown. 1 species. 1. P.typica Boeck 1871 P.t., A. Boeck in: Forh. Selsk. Christian.. 1870 p.265 | 1876 P.t., A. Boeck, Skand, Arkt. Amphip., ©.2 p. 660 1.29 f.8 | 18938 P.t., A. Della Valle in: F. Fl. Neapel, v.20 p.319 | 1894 P.t., G. O. Sars, Orust. Norway, v.1 p. 642 1.232 f.2. O. Body smooth; peraeon rather tumid, segments 1 and 2 short. Head slightly produced in front. Side-plates all very small. Eyes large, prominent, rounded, dark red. Antenna 1, 3 joint of peduncle the longest, subequal to 5-jointed flagellum; accessory flagellum with 3joints, 1% subequalto 24 and 3X combined. Antenna2 much shorter and thinner; flagellum shorter than ultimate joint of peduncle. Both antennae densely setose, setae not very long. Gnathopod 2, 6tk joint rather more broadly oval than in Dulichia (p. 708). Peraeopods 1 and 2, 24 joint very slightly dilated. Peraeopods 3—5 not greatly elongated; in peraeo- pod 5 the 4" joint as long as 5tt and 6!" combined, 5** little longer than 6! Uropod 1, peduncle strong, not elon- gate, outer margin fringed with about 8 spines; rami slender, densely fringed with small spines, inner ramus rather the longer, twice as long as peduncle. Uropod 2 Kira (Fig. 127) reaching just beyond the oval telson, and Uropods and telson. armed with 1 apical and 2 lateral spines. Colour pale Kettler 9.0, Bares) yellow, with brownish patches. L. 5 mm. North-Atlantie and North-Sea (Hardangerfjord, depth 56 m; Aalesund, depth 94—188 m), 41. Fam. Hyperiopsidae 1886 Hyperiopsidae, Bovallius in: N. Acta Soc. Upsal., ser. 8 v.13 nr. 9 p.3, 31. Head bulbous. Side-plates rather shallow. Eyes imperfectly developed, ‘ but extensive. Antenna 1 with peduncle short; 1° joint of flagellum elongate, setose; accessory flagellum well developed. Mouth-parts normal, except that maxilla 1 is without inner plate (Chevreux in MS.). Gnathopods 1 and 2 simple. Peraeopods 1 and 2, 4" joint widened and elongate. Peraeo- pods 3—5, 24 joint narrow. Peraeopod 5 elongate, almost filiform. Uro- pods 1—3 biramous, rami equal in uropod 1 and uropod 3, unequal in uropod 2. Telson very small, with a short apical ineision. Marine. l genus, 1 species. 1. Gen. Hyperiopsis 0. Sars 1885 Hyperiopsis (Sp. un.: H.voringü), G.O.Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.231 | 1886 H., Bovallius in: N. Acta Soe. Upsal.. ser.3 v.13.nr.9 p.31 | 1888 H., T. Stebbing in: Rep, Voy. Challenger, v.29 p. 572. With the characters of the family. 1 species. 5 1 1 A Fol N ee FE a RE NERRNEENUER: ER We Ber = ! Hyperiopsis, Gammarideorum genera dubia et species dubiae 715 1. H. veringii O. Sars 1885 H. v., G. O. Sars in: Norske Nordhavs-Exp., v.6 Crust. I p.231 t.20 f.21 | 1886 H. voeringüi, Bovallius in: N. Acta Soc. Upsal., ser.8 v.13 nr.9 p.32 t.2 f.40 | 1899 H. vöringi, Chevreux in: Bull. Soc. zool. France, 0.24 p.148. Body broad, smooth. Pleon segments 5 and 6 elongate. Head with slight projection over base of antenna 1. Side-plates 1—4 only about half as deep as their segments. Pleon segment 3, postero-lateral angles sub- quadrate. Eyes without refractive elements or distinetly developed pigment. Antenna 1 not quite half as long as body, 1° joint short and thick, 24 and 39 very small; flagellum with 1 large joint carrying sensory filaments, followed by 12 short joints; accessory flagellum of 4 joints, 1° the largest. Antenna 2 shorter and more slender. Mandible, molar strong, palp very elongate. Maxilla 1, palp large, 1° joint more than half as long as 24, Maxilla 2, inner plate not fringed on inner margin. Maxillipeds, inner and outer plates well developed, but outer scarcely reaching middle of 24 joint of the elongate palp, 4 joint of which is unguiform. Gnathopods 1 and 2 feeble, similar, not subchelate; 6t" joint slender, searcely longer than 5tR, Gnathopod 2 rather the longer. Peraeopods 1 and 2, 4tk joint tending to fusiform, nearly translucent, more than twice as long as 5tt and 6{k combined, 6!" conical, carrying a mobile finger. Peraeopod 5 almost devoid of setae and with indistinet artieulation of its long slender joints. Uropods 1 and 2, pedunele longer than the rami. Uropod 3, peduncle subequal to the rami. Telson as broad as long; apical lobes rounded. Whole organism fragile. L. about 11 mm. Arctie Ocean and North-Atlantie (Norway, depth 1130 m; from stomach of Rodichthys regina Collett, depth 2410 m; Lofoten Isles, depth 1095 m). Gammarideorum genera dubia et species dubiae. Lepleurus Raf. 1820 L. (Sp. un.: L. rivularis), Rafınesque, Ann. Nat., p. 6. L. rivularis Raf. 1820 L.r., Rafinesque, Ann. Nat., p.6 | 1825 L. r., A.G. Desmarest, Consid. gen. Crust., p. 274, Pennsylvania and at Shannon run. In brooks. „Lusyta Nardo 1847 L. (Sp. un.: Cancer algensis), Nardo, Prosp. Fauna Venet., p-20 | 1847 L., Nardo, Sinon. Spec. Chiereghini, p. 10. L. algensis Nardo 1847 Cancer a. (Chiereghin in MS.), Lusyta, Nardo, Prosp. Fauna Venet., p.20 | 1847 L.a., Nardo, Sinon. Spec. Chiereghini, p.10 | 1869 L. a., Lysita a., Nardo in: Mem. Ist. Veneto, v.14 p.331 t.15 f.7a—c; p.283 | 1893 Erich- thonius difformis (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 386. Head feebly rostrate. Eyes laterally prominent. Antenna 1 the longer. Gnatho- pods 1 and 2 rather large. Peraeopod 3 with finger reverted. Peraeopod 5 the longest. Adriatic (Venice). Tubicolous on Zostera marina. Pephredo Raf. 1814 P. (Sp. un.: P. heteroclitus) (nom. nud.), Rafınesque, Preis Decouv. somiol., p.26 | 1815 P. (nom. nud.), Rafinesque, Anal. Nat., p. 101 | 1817 P. (Sp. un.: P. potamogeti), Rafinesque in: Amer. monthly Mag., v.2 p.41l. P. potamogeti Raf. 1817 P.p., Rafinesque in: Amer. monthly Mag., v.2 p.41. Hudson River and Fishkill. Poinaniyiie Rat. 1817 P &r- un.: P. Pina), rn Mag., v.2 p.4l. j P. littoralis Rat. 1817 DL, Banane a ae un Ag, Er North-Atlantie (Long-Island, New-York) and Hudson River. OR Sperchius Raf. : 1820 8. (Sp. un.: $. Tueidus), Rafinesque, Ann. at, p 6. S. lueidus Raf. 1820 S. L., Rafinosgue,. Ann. Be p- 6 .& 1825 8 % A. @. Desmarest, Consid. gen. Crust., p. 273. Lexington [Kentucky]. In springs and brooks. | lass 2 ee Addenda et Corrigenda. Pag. 12. — Add to the literature of the 2. Gen. Trischizostoma Boeck: 1905 Guerinella, Chevreux in: Bull. Mus. Monaco, nr. 25 p.7. Pag.13.— Addtothe literature of species 1. Trischizostomanicaeense (A.Costa): 1905 Gwuerinella nicaeensis, Chevreux in: Bull. Mus. Monaco, nr. 85 p.7. Pag. 22. — Add to the literature of species 3. Sophrosyne hispana (Chevreux): 1900 8. h., Chevreux in: Rösult. Camp. Monaco, v.16 p.13 t.3 £.1. Pag. 23. — Put after the 12. Gen. Valettia Stebb.: 12*. Gen. Vijaya A. Walker 1904 Vijaya (Sp. un.: V. tenwipes), A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 231, 241. Cfr. Amaryllis (p. 23). 1. V. tenuipes A. Walker 1904 V.t., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.241 t.1 f£.5. Cfr. Glycerina affinis (p. 61). Pag. 29 and 30. — Add to the species of the 15. Gen. Cyphocaris Boeck: 3. C. richardi Chevreux 1905 C.r., Cheyreux in: Bull. Mus. Monaco, nr. 24 p.1 f.1, 2a—g. 4. C. alicei Chevreux 1905 er @., Chevreux in: Bull. Mus. Monaes, nr. 27 p-1 f.1, 2a—m. Cfr. ©. challengeri (p. 29). Pag. 30. — Put after the 15. Gen. Cyphocaris Boeck: 15*. Gen. Paracyphocaris "Chevreux 1905 Paracyphocaris (Sp. typ.: P. praedator), Chevreux in: Bull. Mus. Monaco, nr.32 p.1. 1. P. praedator Chevreux 1905 P.p., Chevreux in: Bull. Mus. Monaco, nr. 52 p.1 f.1, 2a—g, 3a—.g. Pag. 31. — Add to the literature of species 2. Cyelocaris guilelmi Chevreux: 1900 ©. g., G. O. Sars in: Nansen, Norweg. North Polar Exp., v.1 nr.5 p-20 t.2, 3 | 1900 ©. faroensis, A.M. Norman in: Ann. nat, Hist., ser.7 %.5 p. 197 1.6. £.5—15. 718 Addenda et Corrigenda Pag. 31. — Put after the 16. Gen. Cyclocaris Stebb.: Pag. Pag. 16*. Gen. Lysianopsis S. J. Holmes 1903 Lysianopsis (Sp. un.: L. alba), S. J. Holmes in: Amer. Natural., v.37 p.276 | 1905 L., 8. J. Hölnes in: Bull. U. S. Bureau en, v.24 p.475. ‚Near Lysianella (p. 31). 1. L. alba S. J. Holmes 1903 L..a., S. J. Holmes in: Amer, Natural., v. 37 p.276 | 1905 L.a., S.J. Holmes in: Bull. U. S. Bureau Fish., v.24 p. 475 t.5 f.1, f. in text. 33 and 34. — Add to the species of the 19. Gen. Pseudalibrotus Della Valle: 4. P. nanseni O. Sars 1900 P.n., G.O.Sars in: Nansen, Nbrweg. North Polar Exp., v.l nr.5 p.26 t.4, 5. 5. P. glacialis O.Sars 1900 P.g. + P. g. var. leucopis, G. O. Sars in: Nansen, Norweg. North Polar Exp., v.1 nr.5 p.31 t.6. 34. — Put after the 19. Gen. Pseudalibrotus Della Valle: 19*,. Gen. Parambasia A. Walker & A. Scott 1903 Parambasia (Sp. un.: P. forbesiü), A. O. Walker & A. Seott in: H. OÖ. Forbes, Nat. Hist. Sokotra, p. 217, 221. 1. P. forbesii A. Walker & A. Seott 1903 P. f.. A. O. Walker & A. Scott in: H. O. Forbes, Nat. Hist. Sokötra, p. 221 t.14A f.5--5 m. Pag. 39. — Add to the literature of species 5. Lysianassa cinghalensis (Stebb.): Pag. Pag. Pag. Pag. 1904 Lysianax c., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.242 t.1f.6 | 1903 Z. urodus, A. OÖ. Walker & A. Scott in: H. O. Forbes, Nat. Hist. Sokotra, p. 220 t.14A f.4—4g. 37 and 40. — Add to the species of 21. Gen. Lysianassa M.-E.: 8. L. coelochir (A. Walker) 1904 Lysianax c., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.248 t.1 £.7. 42. — Add to the species of 23. Gen. Normanion Bonnier: 3. N. abyssi Chevreux 1903 N.a., Chevreux in: Bull. Soe. zool. France, v.28 p.82 f.la--f. 48. — Put after the 28. Gen. Menigrates Boeck: 28*, Gen. Charcotia Chevreux 1906 Chareotia (Sp. un.: C. obesa), Chevreux in: Bull. Soe, zool. France, v.30 p. 163. 1. C, obesa Chevreux 1906 C. o., Chevreux in: Bull, Soc. zool, France, v.30 p.163 f,3. 49 and 51. — Add to the species of 29. Gen. Aristias Boeck: 6. A.topsenti Chevreux 1900 A.t., Chevreux in: Rösult.. Camp. Monaco, v.16 p.18 1.3 £.2. Addenda et Corrigenda 719 Pag. 5l and 52. — Add to the species of 30. Gen. Ambasia Boeck: 2*, A. murmanica Brüggen 1905 A. m., E. Brüggen in: Trav. Soe. St.- Petersb., 0.36 p.3, 8; t. £.1. Pag. 51. — The name of the 1° species of 30. Gen. Ambasia Boeck is to be changed into: A. atlantica (M.-E.). Add to the literature of this species: 1830 Gammarus atlanticus, H. Milne Edwards in: Ann. Sei. nat., v.20 p.863 | 1840 LZysianassa atlantica. H. Milne Edwards, Hist. nat. Crust., v. 3 p- 22 | 1862 L. a., Bate, Cat. Amphip. Brit..Mus., p. 68 t.10 f. 10 | 1857 L, marina, Bate in: Ann.nat. Hist., ser.2 «.19 p. 138 | 1857 L. m. + Opis typica (err., non Kroyer 1846!), A. White, Hist. Brit. Crust., p. 168; p.165 | 1898 Ambasia danielsseni, A.O. Walker in: P. Liverp. biol. Soe., «12 p.171 | 1900 &05 A.d., Lysianassa atlantica, A. M. Norman in: Ann. nat. Hist., ser.7 v.5 p.144; 0.16 p.79. Pag. 52. — Put after the 30. Gen. Ambasia Boeck: 30*, Gen. Schisturella Norm. | 1900 Schisturella (Sp. un.: S. pulehra), A. M. Norman in: Ann. nat. Hist., ser. 7 v.5 p. 208. Created for Ambasia pulchra (H. J. Hansen) (p. 52): 1. S. pulchra (H. J. Hansen) Add to the literature of this species: 1900 Schisturellapulchra, A.M. Norman in: Ann.nat. Hist., ser.7 0.5 p. 208. Pag. 54. — Add to the literature of species 1. Anonyx nugax (Phipps): 1904 A. n., S. J. Holmes in: P. Calif. Ac., ser.3 v.3 p.513 t.35 £. 17—19; t.36 f.20 | 1877 Lysianassa fisheri, Lockington in: P. Calif. Ac., v.7 p.48. "Pag. 56. — Put after the 32. Gen. Anonyx Kröyer: 32*, Gen. Socarnella A. Walker ; 1904 Socarnella (Sp. un.: 8. bonnieri). A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.231, 239. Öfr. Amaryllis (p. 23), Socarnes (p. 56). 1. S. bonnieri A. Walker 1904 S.b., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., .2 p.239 t.1 £.4. Pag. 58 and 60. — Add to the species of the 34. Gen. Hippomedon Boeck: 7. H. bidentatus Cheyreux 1903 H.b., Chevreux in: Bull. Soe. zool. France, v.28 p.87 f. 4a—f. s 8. H. serratus S. J. Holmes 1903 H. s., S. J. Holmes in: Amer. Natural., v.37 p.278 | 1905 H.s., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p. 473 t.4 f.2 and f. in text. Pag. 61. — Put after the 35. Gen. Glycerina Hasw.: 35*. Gen. Paracallisoma Chevreux 1903 Paracallisoma (Sp. un.: P.alberti), Chevreux in: Bull. Soe. zool. France, v.28 p.84. Cfr. Seopelocheirus (p.61). 1. P. alberti Chevreux 1903 P. a., Chevreux in: Bull. Soe. zool. France, v.28 p.84 f.2, 3a—d. ü 720 Pag. Pag. Pag. Pag. Pag. Addenda et Corrigenda 65 and 66. — Add to the species of the 39. Gen. Centromedon O0. Sars: 5. C. erenulatus Ühevreux 1900 ©, erenulatum, Chevreux in: Result. Camp. Monaco, v.16 p.26 t.5 f.3. 67. — Add to the species of the 40. Gen. Cheirimedon Stebb.: 3. C. fougneri A. Walker 1903 C. f., A. O. Walker in: J. Linn. Soe., 0.29 p.41 t.7 £.1—6. 4. C.hansoni A. Walker 1903 C. h., A. O. Walker in: J. Linn. Soe., v.29 p.42 1.7 £.7—12. 5. C. dentimanus Chevreux 1906 C.d., Chevreux in: Bull. Soe. zool. France, ®.30 p.159 £.1. 68. — Add to the species of the 41. Gen. Tryphosella Bonnier: 2. T. abyssi Norm. 1900 7. a., A.M. Norman in: Ann. nat. Hist., ser. 7 v.5 p.205 t.6 £.16—20. 69. — Add to the literature of species 2. Tryphosa kergueleni (Miers): 1903 Hoplony& k., A. O. Walker in: J. Linn. Soc., v.29 p.5l. 69 and 72. — Add to the species of the 42, Gen. Tryphosa Boeck: 10. T. adarei A. Walker 1903 T.a., A. O. Walker in: J. Linn. Soe., v.29 p.49 t.8 f. 38—44. Pag. Pag. Pag. Pag. Pag. 11. T. murrayi A. Walker 1903 T. m., A. O. Walker in: J. Linn. Soe., v.29 p.50 1.9 £.45—81. 12. T. nugax S. J. Holmes 1904 T. n., 8. J. Holmes in: Harriman Alaska Exp., p. 234 f. 119, 120. 13. T. cucullata A. Walker 1904 T. c., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., ©. 2 p.244 1.4 f.8. * 73. — Add to the literature of the 45. Gen. Tmetonyx Stebb.: 1900 Haplony& (laps.?, corr.: Hoplonyx), A. M. Norman in: Ann. nat, Hist., ser. 7 v.5 p. 209, 211, 212. 76. — Add to the literature of species 7. Tmetonyx leucophthalmus (0. Sars): 1903 Hoplonyx leucophtalmus, Chevreux in: Bull. Soc. zool. France, v.28 p. 97. 74 and 77. — Add to the species of the 45. Gen. Tmetonyx Stebb.: 9. T. exiguus (Chevreux) 1902 Hoplony& e., Chevreux in: ©.-R. Ass. Frang., Sess. 30 v.2 p. 696 t.5 f,1a—k. 10. T. stebbingi (A. Walker) 1903 Hoplonyx s., A. O. Walker in: J. Linn. Soc., v.29 p.52 t.9 f. 52—57*, 79. — Add to the literature of species 3. Lepidepecreum clypeatum Chevreux: 1900 L. c., Chevreux in: Rösult. Camp. Monaco, ®.16 p.28 t.4 f.2. 81 and 83. — Add to the species ofthe 48. Gen. Orchomenella O. Sars: 6. O. dilatata Chevreux 1903 O.d., Chevreux in: Bull. Soc. zool. France, v.28 p. 90 f.5a—f: Near O. laevis (p. 81). Addenda et Corrigenda 721 7. ©. pinguides A. Walker 1903 O.p., A. O. Walker in: J. Linn. Soc., v.29 p.46 t.8 f. 24—380. Very near O. pinguis (p. 82). 8. O. franklini A. Walker 1903 O.f., A. O. Walker in: J. Linn. Soc., 0.29 p.47 t.8 £.31—36. Near O. minuta (p. 82). ; 9. O. macronyx Chevreux 1906 O. m., Uhevreux in: Bull. Soc. zool. France, v.30 p. 161 £. 2. ‚Pag. 84 and 85. — Add to the species of the 49. Gen. Orchomenopsis O. Sars: 5. ©. proxima Chevreux 1903 O. p., Chevreux in: Bull. Soc. zool. France, v.28 p.93 f.6a—c. Very near O. obtusa (p. 85). 6. O. chevreuxi Stebb.!) 1903 O. excavata (non Orchomene excavatus O. Sars 1891, laps. pro: cavimanus), Chevreux in: Bull. Soe. zool. France, v. 28 p- 94 f.7a—g. Near O. zschauii (p- 85). 7. O.nodimana A. Walker 1903 O.nodimanus, A. O. Walker in: J. Linn. Soe., v.29 p.44 t.7 f. 13—17. 8. O.rossi A. Walker 1903 O.r., A. O. Walker in: J. Linn. Soc., v.29 p-45 t.7 f.18—28. Nearly related to O. obtusa (p. 85). Pag. 85. — Put after the 49. Gen. Orchomenopsis (. Sars: 50. Gen. Katius Chevreux 1905 Katius (Sp.un.: K. obesus), Chevreux in: Bull. Mus. Monaco, nr.35 p.1. Near Orchomenopsis (p. 83). 1. K. obesus Chevreux 1905 K.o., Chevreux in: Bull. Mus. Monaco, or.85 p.1 f.1, 2a—h, 3a—h. Pag. 87. — Add to the literature of Anonyx schmardae Heller: 1902 Socarnes schmardai, Chevreux in: C.-R. Ass. Frane., Sess. 30 v.2 p.693. Pag.87. — Lysianassa fisheri Lockington enters into the synonymy of Anonyx nugax (Phipps), see above p. 719. Pag. 87. — Lysianassa marina Bate enters into the synonymy of Ambasia atlantica (M.-E.), see above p. 719. Pag. 100. — Add to the literature of species 1. Ampelisca eschrichtii Kroyer: 1905 A. eschrichti, S. J. Holmes in: Bull. U. S. Bureau Fish., v. 24 p. 525 | 1853 Pseudophthalmus pelagicus, Stimpson in: Smithson. Contr., v.6 nr. 5 p- 57 | 1862 Ampelisca pelagica, Bate, Cat. Amphip. Brit. Mus., p. 94. Pag. 103. — Add to the literature of species 8. Ampelisca uncinata Chevreux: 1900 A. u., Chevreux in: Rösult. Camp. Monaco, v.16 p.42 t.6 £.3. 1) Nom. nov. After E. Chevreux. Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 46 722 Addenda et Corrigenda Pag. 104 and 107.— The species 17. Ampelisca serraticaudata Chevreux enters into the synonymy of species 11. A. rubella A. Costa [fide: Chevreux in: Result. Camp. Monaco, v.16 p. 44]. Pag. 105. — Add to the literature of species 12. Ampelisca amblyops 0. Sars: 1887 A. anomala (err., non O. Sars 1882!), Chevreux in: Bull. Soe. zool. France, v.12 p.567 [fide: Chevreux in: Result. Camp. Monaco, v.16 p.44]. Pag. 109. — Add to the literature of species 20. Ampelisca spinimana Chevreux: 1900 A. s., Chevreux in: Rösult, Camp. Monaco, v. 16 p.39 t.6 £. 2. Pag. 99 and 111. — Add to the species of the 1. Gen. Ampelisca Kroyer: 26. A. compressa S. J. Holmes 1903 A. c., S.J. Holmes in: Amer. Natural., 0.37 p.273 | 1905 A. c., S. J. Holmes in: Bull. U. S. Bureau Fish., v. 24 p.480 t.6 f.1 and f. in text. 27. A. tridens A. Walker 1904 A. t., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 249 t.2 £. 11, t.4 £. 11. 28. A.scabripes A. Walker 1904 A.s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.250 t.2 f. 12. 29. A. brachyceras A. Walker 1904 A.b., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 251 t.2 £. 13. 30. A. cyclops A. Walker 1904 A.c., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.253 t.2 f.14. 31. A. chevreuxi A. Walker 1904 A.c., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 254 t.3 £.15. Pag. 100 and 111. — Ampelisca pelagica (Stimps.) enters into the synonymy of species 1. A, eschrichtii Kroyer. Pag. 114. — Add to the literature of species 7. Byblis Ze Chevreux: 1900 B. g., Chevreux in: R£sult. Camp. Monaco, v.16 p.45 t.7 £.1. Pag. 116. — The name of the 1° species of 3. Gen. Haploops Lilj. is to be changed into: H. dellavallei Chevreux. Add to the literature of this species: 1900 H. dellavallei, Chevreux in: R&sult. Camp. Monaco, v.16 p. 47. Pag. 118 and 273. — A. 0. Walker 1904 (in: Herdman, Rep. Ceylon Pearl Fish, v.2 p. 246) creates the family Argissidae for the genera Platyischnopus Stebb. (p. 122) and Argissa Boeck (p. 276). Pag. 123 and 124. — Add to the species of the 2. Gen. Platyischnopus Stebb.: 3. P.herdmani A. Walker 1904 P. h., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.247 t.2 £.10. Pag. 131. — Add to the literature of species 5. Urothoe poucheti Chevreux: 1900 U. p., Chevreux in: Result. Camp. Monaco, v. 16 p.31 t.5 f.4. Pag. 129 and 132. — Add to the species of the 7. Gen. Urothoe Dana: 8. U. spinidigitus A. Walker 1904 U.s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., ©.2 p.245 t.1 £.9. 9. U. poseidonis Reib. 1905 TU. p., J. Reibisch in: Wiss. Meeresunters., v.8 Abt. Kiel p. 163 t.4 f. 17—21. Addenda et Corrigenda 723 Pag. 138. — Paraphoxus maculatus (Ühevreux) is an accepted species; add to the literature of this species: 1900 P. m., Chevreux in: R£sult. Camp. Monaco, 0.16 p. 34 t.5 f.5. Pag. 137 and 138. — Add to the species of the 3. Gen. Paraphoxus (. Sars: ..8. P. spinosus S. J. Holmes 1903 P. s., S. J. Holmes in: Amer. Natural., v.37 p.276 | 1905 P. s., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.477 £. Pag. 142. — Add to the literature of species 5. Harpinia excavata Chevreux: 1900 H. e., Chevreux in: Result. Camp. Monaco, v.16 p.37 t.6 £.1. Pag. 140 and 145. — Add to the species of the 5. Gen. Harpinia Boeck: 13. H. latipes Norm. 1900 H.1I., A.M. Norman in: Ann. nat. Hist., ser. 7 v.5 p.338 f. Pag. 147. — Add to the literature of species Pontharpinia uncirostrata (Giles): 1904 Leptophoxus uneirostratus, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 249. Pag. 149, 151 and 161. — Probolium spence-batei Stebb. (p. 161) is to be accepted among the species of 1. Gen. Amphilochus Bate: 6. A. spence- batei (Stebb.). Add to the literature of this species: 1900 eng anomalus, Chevreux in: Rösult. Camp. Monaco, v.16 p.48 t.7 £.2 Pag. 150. — Synonyma of species 2. Amphilochus neapolitanus Della Valle are: A. melanops A. Walker (p. 152), fide A. M. Norman in: Ann. nat. Hist., ser.7 v.6 p.34 t.3 £.1, and: A. melanops A. Walker (p. 152), A. brunneus Della Valle (p. 151) and ? A. marionis Stebb. (p. 151), fide A. O. Walker in: J. Linn. Soc., v. 28 p. 300. Pag. 151—153. — Amphilochus longimanus Chevreux belongs to the 2. Gen. Amphilochoides 0. Sars: 4. A. longimanus (Chevreux) 1888 Amphilochus l., Chevreux in: Bull. Soe. zool. France, v.13 p.41 | 1900 Amphilochoides I., Chevreux in: Rösult. Camp. Monaco, v.16 p.50 t.7 £.3. Pag. 152 and 161. — The 1° species of 2. Gen. Amphilochoides (O. Sars changes its name into: 1. A. serratipes (Norm.), fide A. M. Norman in: Ann. nat. Hist., ser.7 v.6 p.35. Add to its literature from p. 161: 1869 Probolium serratipes, A. M. Norman in: Rep. Brit. Ass., Meet. 38 p.273. Pag. 158. — Add to the species of 6. Gen. Cyproidea Hasw.: 2. C. otakensis (Chilton) 1900 Cyproidia o., Chilton in: Ann. nat. Hist., ser. 7 v.5 p. 243 t.5. - ' Pag. 160. — Add to the literature of Peltocoxa brevirostris (T. & A. Scott): 1900 Stegoplax b., A.M. Norman in: Ann. nat. Hist., ser. 7 v.6 p.38. Pag. 161. — Putafter the 9. Gen. Paracyproidea Stebb.: 10. Gen. Gallea A. Walker 1904 Gallea (Sp. un.: @.tecticauda), A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 232, 256. 1. G. tecticauda A. Walker 1904 @.t., A. O, Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2- p. 256 t.3 £.16, t.8 £. 16. 46* 724 Pag. Pag. Pag. Pag. Pag. Pag. Pag. Pag. | Pag. Addenda et Corrigenda 162 and 163. — Add to the species of 1. Gen. Seba Bate: 3. S. armata Chevreux 1900 S.a., Chevreux in: Rösult. Camp. Monaco, v.16 p.111 t.13 £.1. Add to the literature of this species from species 2. S. saundersii Stebb. (p. 163): 1889 Grimaldia armata, Chevreux in: Bull. Soe.zool. France, v. 14 p. 284 f. | 1899 Seba a., Chevreux in: Ö.-R. Ass. Frang., Sess. 27 v.2 p. 483. 164 and 168. — Add to the species of 2. Gen. Leucothoe Leach: 12. L. euryonyx A. Walker 1901 L. e., A. O. Walker in: J. Linn. Soec., v.28 p.802 1.27 f. 24—26. 13. L. hornelli A. Walker 1904 L. h., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 258 t.3 £. 17. 14. L. stegoceras A. Walker 1904 L.s., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.259 t.3 £.17a. 167. — Synonyma of species 11. Leucothoe lilljeborgii Boeck are: L. furina Chevreux (non Savigny) (p. 165), L. ineisa D. Roberts. (p. 167) and L. serratipalma (laps. pro: serraticarpa Della Valle) fide A.M. Norman in: Ann. nat. Hist., ser.7 v.6 p.47, and: L. incisa D. Roberts. fide J. Reibisch in: Wiss. Meeresunters., v.8 Abt. Kiel p. 179 1.5 £.5. 170 and 171. — Add to the species of the 1. Gen. Anamixis Stebh.: 2. A. stebbingi A. Walker 1904 A. s., A. ©. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.259 t.3 £. 18. 172. — Add to the literature of 1. Gen. Metopa Boeck: 1900 Metopina (Sp. typ.: Metopa palmata) (non Macquart 1835, Diptera!), A.M. Norman in: Ann. nat. Hist., ser.7 v.6 p.45 | 1902 Sthenometopa, A.M. Norman in: Ann. nat. Hist., ser. 7 v. 10 p. 480. 173. — Add to the literature of species 2. Metopa robusta 0. Sars: 1900 Metopina r., A.M. Norman in: Ann. nat. Hist., ser.7 v.6 p.45 | 1902 Sthenometopa r., A. M. Norman in: Ann. nat. Hist., ser. 7 v.10 p. 480. 174. — Add to the literature of species 5. Metopa palmata 0. Sars: 1900 Metopina p., A.M. Norman in: Ann. nat. Hist., ser.7 0.6 p.45 | 1902 Sthenometopa p., A. M. Norman in: Ann. nat. Hist., ser. 7 v.10 p.481. 175. — Add to the literature of species 6. Metopa clypeata (Kroyer): 1900 Metopina c., A.M. Norman in: Ann. nat. Hist., ser.7 v.6 p.45 | 1902 Sthenometopa c., A. M. Norman in: Ann. nat. Hist., ser. 7 «.10 p.481. 172 and 182. — Add to the species of the 1. Gen. Metopa Boeck: 22. M. abscisa Norm. 1868 Montagua celypeata (err., non Leucothoe c. Kreyer 1842!), Bate & Westwood, Brit. sess. Crust., v.2 p.499 | 1900 Metopa abscisa, A. M. Norman in: Ann. nat. Hist., ser. 7 v.6 p.42 t.3 f.6—10. 23. M. quadrangula Reib. 1905 M.q., J. Reibisch in: Wiss. Meeres- unters., v.8 Abt. Kiel p. 178 t.5 f.1—4. Addenda et Corrigenda 725 Pag. 187, 190, 195. — The 7tk species of 4. Gen. Proboloides Della Valle is synonym to the 6 species of 1. Gen. Stenothoe Dana, and changes its name into P. elypeatus (Stimps.) with the following literature: 7. P. elypeatus (Stimps.) 1853 Stenothoe clypeata, Stimpson in: Smithson. Contr., v.6 nr.5 p.51 | ?1862 S$. clypeatus, Bate, Cat. Amphip. Brit. Mus., p. 61 t.9 £.7 | 1887 Metopa groenlandica, H. .J. Hansen in: Vid. Meddel., ser. 4 v.9 p. 94 t.3 £.7—Te | 1905 M. g., S. J. Holmes in: Bull. U. S, Bureau Fish., v. 24 p.483 1.6 £.3, f. in text. | 1893 Stenothoe clypeata + M.g., A. Della Valle in: F. Fl. Neapel, v.20 p.569; p.640 t. 59 £.55. Pag. 192 and 200. — Add to the genera of 11. Fam. Stenothoidae: 2. Gen. Parametopa Chevreux 1901 Parametopa (Sp. un.: P. kervillei), Chevreux in: Bull. Soc. Rouen, 0.86 p. 233. 1. P. kervillei Chevreux 1901 P. k., Chevreux in: Bull. Soc. Rouen, v.36 p.233 t.3. 3. Gen. Stenothoides Chevreux 1900 Stenothoides (Sp. typ.: S. perrieri). Chevreux in: Result. Camp. Monaco, v.16 p.55. 1. S. perrieri Chevreux 1900 $. p., Chevreux in: Result. Camp. Monaco, v.16 p.55 t.8 £.2. Pag. 193 and 199. — Add to the species of 1. Gen. Stenothoe Dana: 16. S. setosa Norm. 1900 $.s., A.M. Norman in: Ann. nat. Hist., ser. 7 0.6 p.39 1.3 £.2—4. Near S. dollfusi (p. 196). 17. S. cypris S. J. Holmes 1903 $.c., S.J. Holmes in: Amer. Natural., 0.87 p.278 | 1905 $.e., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p. 484 f. 18. S. minuta S. J. Holmes 1903 S. m., S. J. Holmes in: Amer. Natural., 0.87 p.278 | 1905 S. m., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p. 485 f. 19. S. alaskensis S. J. Holmes 1904 S.a., S. J. Holmes in: Harriman Alaska Exp., v.10 p.236 f. 121, 122. 20. S. gallensis A. Walker 1904 $.g., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.261 t.3 £.19. Very near S. valida (p. 194). Pag. 196. — Add to the literature of species 8. Stenothoe dollfusi Chevreux: 1900 8. d., Chevreux in: Rösult. Camp. Monaco, v.16 p.53 t.8 £.1. Pag. 198. — Add to the literature of species 12. Stenothoe marina (Bate): 1904 8. m. var. sinhalensis, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 261. Pag. 200. — Put after the 11. Fam. Stenothoidae: 11*, Fam. Ingolfiellidae 1903 Ingolfiellidae, H: J. Hansen in: J. Linn. Soe., v.29 p. 117. 726 Addenda et Corrigenda 1. Gen. Ingolfiella H. J. Hansen 1903 Ingolfiella, H. J. Hansen in: J. Linn. Soc., v.29 p.118, 128. 1. I. abyssi H. J. Hansen 1903 I.a., H.J. Hansen in: J. Linn. Soe., v.29 p.118 t.14 £.1—18, t. 15 £. 19—21. 2. I. littoralis H. J. Hansen 1903 1.1, H. J. Hansen in: J. Linn. Soc., v.29 p.124 t.15 f. 22—33. Pag. 201. — Add to the literature of species 1. Pereionotus testudo (Mont.): 1903 P. t., A. O. Walker & A. Seott in: H.O. Forbes, Nat. Hist. Sokotra, p- 227 t.14B f.4a, b. Pag. 204. — Add to the literature of species 1. Iphinotus typicus (G.M. Thoms.): 1902 I. typica, G. M. Thomson in: Ann. nat. Hist., ser. 7 v.10 p. 464. Pag. 205. — Put at the end of 12. Fam. Phliantidae: Gen. Kuria A. Walker & A. Seott 1903 Kuria (Sp. un.: K. longimanus), A. O. Walker & A, Scott in: H.O. Forbes, Nat. Hist. Sokotra, p. 217, 228. Cfr. Bircenna (p. 205). K. longimana A. Walker & A. Scott 1903 K. longimanus, A. O. Walker & A. Seott in: H. O. Forbes, Nat. Hist. Sokotra, p. 228 t. 14B f.5—5n. Pag. 234. — Add to the literature of species Liljeborgia pugettensis (Dana): 1904 Gammarus p., S. J. Holmes in: Harriman Alaska Exp., v.10 p. 239. Pag. 237, 238. — Add to the species of 1. Gen. Perioculodes 0. Sars: 2. P. serra A. Walker 1904 P.s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.262 t.4 f.20. Near P.longimanus (p. 237). Pag. 244. — Add to the species of 6. Gen. Oediceros Kroyer: 3. O.newnesi A. Walker 1903 0. n., A. O. Walker in: J. Linn. Soe., v.29 p.53 t.9 f. 62-66, t. 10 f.67, 68. Very near O. saginatus (p. 244). Pag. 248. — Add to the literature of 9. Gen. Arrhis Stebb.: 21880 Aceropsis (nom.nud.), Stuxberg in: Bih. Svenska Ak., v.5 nr.22 p.63. Pag. 254. — The name of the 24 species of 13. Gen. Acanthostepheia Boeck is to be changed into: 2. A. behringiensis (Lockington), of which A. pulchra Miers is a synonym. Add to the literature of species 2. A. behringiensis (Lockington): 1904 A. behringanus, S. J. Holmes in: P. Calif. Ac., ser.3 ©.3 p.315 t. 36 f. 25—28. Pag. 259. — Add to the literature of species 1. Monoculodes gibbosus Chevreux: 1900 M. g., Chevreux in: Rösult. Camp. Monaco, v.16 p.59 t.8 £.3. Addenda et Corrigenda 727 Pag. 259 and 267. — Add to the species of 17. Gen. Monoculodes Stimps.: 19. M. edwardsi S. J. Holmes 1905 M.e., S. J. Holmes in: Bull. U. S. Bureau Fish., 0.24 p.487 f. ; Pag. 276. — Add to the species of 2. Gen. Tiron Lillj.: 2. T.thompsoni A. Walker 1904 T. t., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.263 t.4 f.21. Pag. 285—287, 308. — Add to the genera of 22. Fam. Calliopiidae: 1*, Gen. Bouvierella Chevreux 1900 Bouwvierella (Sp. typ.: B. careinophila), Chevreux in: Rösult. Camp. Monaco, v.16 p.70. Created for Laothoes carcinophilus (Chevreux) (p. 287): 1. B. carcinophila (Chevreux). Add to the literature of this species: 1900 B. c., Chevreux in: Rösult, Camp, Monaco, ©.16 p.71 t.9 £.3. Pag. 285 and 294. — Put after the 6. Gen. Leptamphopus (. Sars: 6*. Gen. Oradarea A. Walker 1903 Oradarea (Sp. un.: O. longimana), A. O. Walker in: J. Linn. Soe., v.29 p.40, 56. : Near Amphithopsis (p. 289), but perhaps nearer Leptamphopus (p. 298). 1. ©. longimana A. Walker 1903 O.l., A. O. Walker in: J. Linn. Soe., v.29 p.56 t.10 £.77—89. Strangely like Leptamphopus novaezealandiae (p. 294). Pag. 299 and 300. — Add to the species of 11. Gen. Atylopsis Stebb.: 3. A. latipalpus A. Walker & A. Scott 1903 A.L, A.O. Walker & A. Seott in: H. ©. Forbes, Nat. Hist. Sokotra, p. 222 t.14A £.7—7l. Pag. 304. — Add to the literature of 15. Gen. Apherusa A. Walker: 1858 Phaedra (Sp. un.: P. antiqua), Bate in: Quart, J. geol. Soc., v.15 p. 138, 140. ‘Pag. 304 and 308. — Add to the species of 15. Gen. Apherusa A. Walker: 8. A. gracilis S. J. Holmes 1903 A. g., S.J. Holmes in: Amer. Natural., 0.37 p.287 | 1905 A. g., S.J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.495 f. 9. A. clevei O. Sars 1904 4. e., G.O.Sars in: Publ. Expl. Mer, nr.10 p-3 t.1. 10. A. ovalipes Norm. 1906 A.o., A.M. Norman (& T., Scott), Crust. Devon Cornwall, p.75 1.8 £.1—8. A. antiqua (Bate) 1858 Phaedra a., Bate in: Quart. J. geol. Soe., v.15 p-138 t.6 f.8 | 1905 P.a., Apherusa?, A. M. Norman in: Ann. nat, Hist., ser. 7 v.16 p.81. 728 Pag. Pag. Pag. Pag. Pag. Pag. Pag. Addenda et Corrigenda 312 and 315. — Add to the species of 2. Gen. Neopleustes Stebb.: 8. N. pacificus (A. Walker) 1898 Paramphithoe pacifica, A. OÖ. Walker in: P. Liverp. biol. Soe., v.12 p.281. N. pugettensis (Dana) 1853 & 55 Iphimedia p., J.D. Dana in: U.S.expl. Exp., v.1311 p. 932; t.63 f.6a—g | 1898 Paramphithoe p., A. O. Walker in: P. Liverp. biol. Soe., v. 12 p. 281. 320. — Put after the 5. Gen. Sympleustes Stebb.: 6. Gen. Dautzenbergia Chevreux 1900 Dautzenbergia (Sp. un.: D. grandimana), Chevreux in: R£sult. Camp. Monaco, v.16 p.73. Created for Sympleustes grandimanus (Chevreux) (p. 318): 1. D. grandimana (Chevreux) Add to the literature of this species: 1900 D. g., Chevreux in: R£sult. Camp. Monaco, ©. 16 p.73 t.10 £.1. 321 and 324. — Add to the species of 1. Gen. Epimeria A. Costa: 5. E.inermis A. Walker 1905 E.i., A. O. Walker in: J. Linn. Soe., v.29 p:54 t. 10 £.69. 328 and 329. — Add to the species of 1. Gen. Atylus Leach: 2. A. walkeri Stebb.!) 1903 A. antarcticus (non T. Stebbing 1878!), A.O. Walker in: J. Linn. Soe., 9.29 p.58 t. 11 £. 91—97. 329 and 334. — Add to the species of 2. Gen. Nototropis A. Costa: 8. N. minikoi (A. Walker) 1905 Paratylus m., A. O. Walker in: Gardiner, Fauna Mald. Laccad., v.2 p. 925 f. 141ı—v. 9. N. granulosus (A. Walker) 1904 Paratylus g., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 265. 334 and 338. — Add to the genera of 26. Fam. Melphidippidae: 3. Gen. Hornellia A. Walker 1904 Hornellia (Sp. un.: H. incerta), A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.233, 268. 1. H.incerta A. Walker 1904 H.i., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.269 t.4 f. 27. 338 and 355. — Add to the genera of 27. Fam. Eusiridae: 7. Gen. Eusirogenes Stebb. 1904 Eusirogenes (Sp. un.: E. dolichocarpus), T. Stebbing in: Tr. Linn. Soc. London, ser.2 v.10ur p.13, 15. 1. E. dolichocarpus Stebb. 1904 E. d., T. Stebbing in: Tr. Linn. Soe. London, ser.2 v.10u p.15 t.2A, !) Nom. nov. After Alfred O. Walker. N Addenda et Corrigenda 729 Pag. 339 and 343. — Add to the species of l. Gen. Eusirus Kroyer: 9. E. laevis A. Walker 1903 E.1., A.O. Walker in: J. Linn. Soe., 0.29 p. 55 t. 10 £. 70—76. Cfr. E. antaretieus (p. 340). Pag. 345 and 346. — Add to the species of 3. Gen. Eusiroides Stehb.: ‘4. E. sarsi Chevreux 1900 E.s., Chevreux in: Rösult. Camp. Monaco, v.16 p.65 t.9 £.2. 5. E. orchomenipes A. Walker 1904 E.o., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 264 t.4 f.23. Pag.350.— Addtothe literature ofspecies3. Rhachotropis grimaldii (Chevreux): 1900 Rachotropis g., Chevreux in: Result. Camp. Monaco, v.16 p.68 t.9 £.1. Pag. 355 and 356. — Add to the species of 1. Gen. Batea Fr. Müll.: 2. B. secunda S. J. Holmes 1903 B.s., S. J. Holmes in: Amer. Natural., v.37 p.284 | 1905 B. s., S.J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.499 f£. Pag. 362. — Add to the species of 6. Gen. Atyloides Stebb.: 2. A. gabrieli Sayce 1901 A.g., Sayce in: P. R. Soc. Vietoria, v.13 p.230 t. 37, 38. ‘ 3. A. fontanus Sayce 1902 A. fontana, Sayce in: P. R. Soe. Victoria, v.15 p.49 t.5. Pag. 362. — Add to the literature of species 1. Atyloides serraticauda Stebb.: 1903 A. s., A. OÖ. Walker in: J. Linn. Soe., ©.29 p.58 t. 11 f. 90. Pag. 364 and 411. — Add to the genera of 30. Fam. Gammaridae: 21*. Gen. Bathyonyx Vejd. 1905 Bathyonyx (Sp. un.: B. devismesi), Vejdovsky in: SB. Böhm. Ges., nr.28 p.2. 1. B. devismesi Vejd.. 1905 B. d., Vejdovsk$ in: SB. Böhm. Ges., nr.28 p.2 1.1 f.1—15, 1.2 1.16—19. 21**, Gen. Pseudoniphargus Chevreux 1901 Pseudoniphargus (Sp. un.: P. africanus), Chevreux in: Bull. Soe. zool. France, v.26 p.211. - 1. P. africanus Chevreux 1901 P.a., Chevreux in: Bull. Soc. zool. ‘France, 0.26 p. 211 f. 1, 2a—h, k. Pag. 370. — Add to the literature of 5. Gen. Crangonyx Bate: 1902 Stygonectes (Sp. typ.: Crangonyx flagellatus), W. P. Hay in: P. U. S. Mus., v.25 p.430. Pag. 371 and 373. — Add to the species of 5. Gen. Crangonyx Bate: 7. ©. bowersii C.J. Ulr. 1902 C©.b., ©. J. Ulrich in: Tr. Amer. mier. Soc., v.23 p.85 t. 14. 730 Addenda et Corrigenda Pag.371. — Add to the literature of species 2. Crangonyx flagellatus Benedict: 1902 C. f., Stygonectes sp. typ., W. P. Hay in: P. U.S. Mus., v.25 p. 430. Pag. 373. — Add to the literature of species 5. Crangonyx bifurcus O.P.Hay: 1902 Niphargus b., W. P. Hay in: P. U. S. Mus., v.25 p. 429. Pag. 374. — Add to the literature of 7. Gen. Pallasea Bate: 1901 Pleuracanthus (non Gray 1832, Coleoptera!) (part.) + Dybowskia (non Dall 1876. Mollusca!) (part.), Garjajeff in: Trudui Kazan. Univ., v.385 p. 16. Pag. 376. — Add to the literature of species 3. Pallasea cancellus (Pall.): 1901 Dybowskia c., Garjajeff in: Trudui Kazan. Univ., v.35 p.40. Pag. 377. — Add to the literature of species 4. Pallasea gerstfeldtii (Dyb.): 1901 Dybowskia cancellus var. g., Garjajeffin: Trudui Kazan. Univ., 0.85 p.40. Pag. 377. — Add to the literature of species 5. Pallasea quadrispinosa 0. Sars: 1901 Dybowskia kesslerii var. euwropeus, Garjajeff in: Trudui Kazan. Univ., v.35 p.39. Pag. 378. — Add to the literature of species 6. Pallasea kesslerii (Dyb.): 1901 Dybowskia k., Garjajeff in: Trudui Kazan. Univ., 0.35 p.39. Pag. 378. — Add to the literature of species 7. Pallasea baikali Stebb.: 1901 Pleuracanthus lovenii, Garjajeff in: Trudui Kazan. Univ., 0.35 p.42. Pag. 379. — Add to the literature of species 8. Pallasea brandtii (Dyb.): 1901 Dybowskia b., Garjajeff in: Trudui Kazan. Univ., 0.35 p.40. Pag. 379. — Add to the literature of species 9. Pallasea grubii (Dyb.): 1901 Dybowskia g., Garjajeff in: Trudui Kazan. Univ., v.35 p. 39. Pag. 380. — Add to the literature of species 10. Pallasea cancelloides (Gerstf.): 1901 Dybowskia ce., Garjajeff in: Trudui Kazan. Univ., v.35 p.40. Pag. 375 and 380. — Add to the species of 7. Gen. Pallasea Bate: P. dryshenskii (Garjajeff) 1901 Dybowskia d., Garjajeff in: Trudui Kazan. Univ., v.35 p.35 t.2 f.19, t.3 f. 68—72. P. meyerii (Garjajeff) 1901 Dybowskia m., Garjajeff in: Trudui Kazan, Univ., 0.35 p.36 t.2 £.17, t.3 £.58--62. P. nigra (Garjajeff) 1901 Pleuracanthus niger, Garjajeff in: Trudui Kazan. Univ., 0.35 p.40 t.2 f. 21, t.3 f. 79—83. P. viridis (Garjajeff) 1901 Dybowskia v., Garjejeff in: Trudui Kazan. Univ., v.35 p.32 t.2 f. 18, t.3 f. 63-67. Pag. 381. — Add to the literature of species 1. Weyprechtia heuglini (Buchh.): 1900 Wayprechtia h., A. Birula in: Annuaire Mus. St.-Petersb., v. 4 p. 442 £.3—9. Pag. 388. — Add to the literature of 13. Gen. Eucrangonyx Stebb.: 1902 Bactrurus (Sp. un.: Crangonyxe mueronatus), W.P. Hay in: P. U. S. Mus., v.25 p. 430. Addenda et Corrigenda 731 Pag. 388. — Add to the literature of species 1. Euerangonyx mucronatus (S. A. Forb.): 1902 Crangonyx m., Bactrurus, W. P. Hay in: P. U. S. Mus., v.25 p. 430. Pag. 390. — Add to the literature of species5. Eucrangonyx antennatus (Pack.): 1902 Niphargus a., W. P.Hay in: P. U. S. Mus., 0.25 p.430 f.6a—m. Pag. 391. — Add to the literature of 14. Gen. Axelboeckia Stebb.: 1901 COtenacanthus (non Agassiz 1837, Pisces!) (part.), Garjajeff in: Trudui Kazan. Univ., 0.35 p.15. Pag. 392. — Add to the literature of species 2. Axelboeckia carpenterii (Dyb.): 1901 Ctenacanthus c., Garjajeff in: Trudui Kazan. Univ., v.35 p.21. Pag. 404. — Add to the literature of 20. Gen. Neoniphargus Stebb.: 1901 Unimelita, Sayce in: P. R. Soc. Vietoria, v.13 p. 237. Pag. 404 and 405. — Add to the species of 20. Gen. Neoniphargus Stebb.: 2. N. spenceri (Sayce) 1901 & 02 Unimelita s., Sayce in: P. R. Soc, Vietoria, v.13 p.238 1.40; v.15 p. 57. 3. N. fultoni Sayce 1902 N.f., Sayce in: P. R. Soe. Vietoria, v. 15 p-57 t.7. Pag. 404. — Add to the literature of species 1. Neoniphargus thomsoni Stebb.: 1901 Niphargus montanus, Unimelita (part.), Sayce in: P. R. Soc. Victoria, v.13 p.237 | 1901 N. m., Sayce in: Ann. nat. Hist., ser. 7 v.8 p. 562. Pag. 405 and 409. — Add to the species of 21." Gen. Niphargus Schiödte: 11. N. mortoni G. M. Thoms. 1893 N. m., G. M. Thomson in: P.R. Soe. Tasmania, 1892 p.68 t.4 £.11, 12; 1.5 f. 1-5. Showing approximation to Iphigenella (p. 447). 12. N. pulchellus Sayce 1900 N. p., Sayce in: P. R. Soc. Vietoria, v.12 p.152 t.15, 16. 13. N. plateaui Chevreux 1901 N. p. + N. p. elongatus + N. p. robustus, Chevreux in: Bull. Soc. zool. France, ©.26 p.168 £.1, 2; p.173 f.3; p- 234 f.1. 14. N, ladmiraulti Chevreux 1901 N. l., Chevreux in: Bull. Soc. zool. France, v.26 p. 174 f.1—4. re 408. — Add to the literature of species 6. Niphargus virdi Chevreux: 1901 N. v.,. Chevreux in: Bull. Soc. zool. France, v.26 p.197 f.la, 2b—g. Pag. 408. — Add to the literature of species 7. Niphargus fontanus Bate: 1901 N. f.. Chevreux in: Bull. Soc. zool. France, v.26 p.201 f.1, 2a—d. Pag. 408. — Add to the literature of species 8. Niphargus kochianus Bate: 1904 N.k., Kane in: Ann. nat. Hist., ser. 7 v.14 p. 274 t.8 f.1—3. Pag. 409. — Add to the literature of species Niphargus caspary (Pratz): 1905 N. e., N. casparyi,- Vejdovskf in: SB. Böhm. Ges., nr. 28 p.18. 732 Addenda et Corrigenda Pag. 410. — Add to the literature of species Niphargus rhipidiophorus (Catta): 1901 Gammarus r.?, Chevreux in: Bull. Soc. zool. France, v.26 p.216 f.1, 2a—f. Pag. 410. — Add to the literature of species Niphargus subterraneus (Leach): 1904 N. s., N. fontanus Bate?, Kane in: Ann. nat. Hist., ser. 7 v.14 p. 280 t.8 £.4, 5. Pag. 411. — Add to the species of 22. Gen. Eriopisa Stebb.: 2. E. sechellensis Chevreux 1901 E. s., Chevreux in: M&m. Soe. zool. France, v.14 p.403 f. 19—23. Pag. 417. — Add to the species of 27. Gen. Parelasmopus Stebb.: 2. P. setiger Chevreux 1901 P.s., Chevreux in: Mörn. Soc. zool. France, v.14 p.412 f. 32—39. Pag. 417. — Add to the literature of species 1. Parelasmopus suluensis (Dana): 1904 P. s, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 278 t.6 f. 38. Pag. 421 and 428. — Add to the species of 30. Gen. Melita Leach: 13. M. richardi Chevreux 1900 M. r., Chevreux in: Rösult. Camp. Monaco, v.16 p.81 t.10 £.3. 14. M. parvimana S. J. Holmes 1903 M.p., S. J. Holmes in: Amer. Natural., v.37 p.279 | 1905 M.p., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p. 506 f. 15. M. zeylanica Stebb. 1904 M.z., T. Stebbing in: Spolia-Zeyl., v.2 p.22 t.5. Pag. 429. — Add to the literature of species Melita inaequistylis (Dana): 1904 Maera tenwicornis, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.273 t.5 £.33. Pag. 433 and 439. — Add to the species of 33. Gen. Maera Leach: 13. M. dubia Calm. 1898 M.d., Calman in: Ann.N. York Ac., v.11 p.269 t.32 f.3. Near to M. fureicornis (p.437) and M. fusca (p. 440). 14. M. hirondellei Chevreux 1900 M.h., Chevreux in: Rösult. Camp. Monaco, v.16 p.84 t. 11 £.1. . 15. M. othonides A. Walker 1904 M.o. A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.271 t.5 £.29. Very near M. othonis (p. 438). Pag. 441 and 445. — Add to the species of 34. Gen. Elasmopus A. Costa: 10. E. insignis Cheyreux 1901 E. i., Chevreux in: Möm. Soc. zool, France, v.14 p.406 f. 24—81. 1l. E. sokotrae A.Walker & A. Scott 1903 E.s., A. O. Walker & A. Seott in: H. O. Forbes, Nat. Hist. Sokotra, p. 228 t. 14B f. 1—1i. Near E. insignis Chevreux. 12. E. dubius A. Walker 1904 E.d., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 276 t.5 £.35. Compared with E. rapax (p.444) and Moera festiva (p. 431). N a 12a I alt We a ER BE a a ET Ze etz ne en a a a ee ern. MR F A a VE Sa PR Te Addenda et Corrigenda 733 18. E. spinimanus A. Walker 1904 E.s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 277 t.5 £. 36. Compared with E. rapax and E. affınis (p. 444). 14. E. serrula A. Walker 1904 E.s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 277 t.8 £.37. Compared with E. rapax (p. 444). : 15. E. latibrachium A. Walker 1905 E.1., A. O. Walker in: Gardiner, Fauna Mald. Laccad., v.2 p. 928 t.88 f.6—10. ‚Pag. 460 and 477. — Add to the species of 44. Gen. Gammarus F.: 3l. G. limnaeus S. I. Sm. 1871 @. lacustris (non G. O. Sars 1863!), S. I. Smith in: Amer. J.Sei., ser.3 v2 p.453 | 1874 G. limnaeus, S. I. Smith in: Rep. U. S. Fish. Comm., v.2 p. 651 t.2 £.6, 7. Near 6. pulex (p. 474). ; 32. G. sarsii Sowinski 1898 @. s., Sowinski in: Bull. Ae. St.-Pötersb., v.8 p.869 1.2 £.7—16, t.3 £. 18. 33. G. australis Sayce 1901 @. a., Sayce in: P. R. Soe. Vietoria, v.13 p.233 t. 39. 34. G. tetrachantus Garbini 1902 @.t., Garbini in: Zool. Anz., v.25 p. 153 £.1. 85. G. haasei Sayce 1902 @. h., Sayce in: P. R. Soe. Vietoria, v.15 p.58 t.6. Compared with G. australis Sayce (p. 733) and Niphargus mortoni G,M. Thoms. (p. 731). 36. G. propinguus W.P. Hay 1902 @. p., W. P. Hay in: P. U.S. Mus., 0.25 p. 24. Compared with Dikerogammarus faseiatus (p. 460). 37. G. purpurascens W.P.Hay 1902 @.p., W.P.Hay in: P. U.S. Mus., v.25 p.433 f.7a—n. Compared with G. limnaeus S. I. Sm. (p. 733). Pag. 462. — Add to the literature of species 1. Gammarus guernei Chevreux: 1900 @.g., Chevreux in: Rösult. Camp. Monaco, v.16 p.76 t.10 f.2. ?Near Niphargus rhipidiophorus (Catta) (p. 410). Pag. 473. — Add to the literature of species 24. Gammarus duebenii Lilj.: 1897 @.d. var. wilkitskii, Birula in: Annuaire Mus. St.-Pötersb., p. 108. Pag. 497. — Add to the literature of 48. Gen. Parapallasea Stebb.: 1901 Pleuracanthus (non Gray 1832, Coleoptera!) (part.), Garjajeff in: Trudui Kazan. Univ., 0.35 p. 16. Pag.498. — Add to the literature of species 1. Parapallasea borowsküi (Dyb.): 1901 Pleuracanthus b. + P.b. var. abyssalis + P.b. var. dichraas (Gam- marus borawkii var. dichrou, laps. pro: @. borowskii var. dichrous), Garjajeff in: Trudui Kazan. Univ., v.35 p.42, 43. Pag. 493. — Add to the literature of species 2. Parapallasea lagowskii (Dyb.): 1901 Pleuracanthus 1., Garjajeff in: Trudui Kazan. Univ., 0.35 p.43. 734 Addenda et Corrigenda Pag. 498. — Add to the literature of species 3. Parapallasea puzyllii (Dyb.): 1901 Pleuracanthus p., Garjajeff in: Trudui Kazan. Univ., 0.85 p. 48. Pag. 501. — Add to the literature of 50. Gen. Carinogammarus Stebb.: 1901 Otenacanthus (non Agassiz 1837, Pisces!) (part.), Garjajeff in: Trudui Kazan. Univ., 0.35 p.15. Pag. 502. — Add to the literature of species 2. Carinogammarus wagii (Dyb.): _ 1901 Ctenacanthus w., Garjajeff in: Trudui Kazan. Univ., v.35 p.21. Pag.506. — Add to the literature ofspecies Carinogammarus mucronatus (Say): 1905 ©. m., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.503 £. | 1905 C. m., Paulmier in: Bull. N.-York Mus., Bull. 91 Zool. 12 p.161 £. 30. Pag. 501 and 506. — Add to the species of 50. Gen. Carinogammarus Stebb.: C. roseus (Garjajeff) 1901 Ctenacanthus r., Garjajeff in: Trudui Kazan. Univ., 0.35 p.19 t.2 £.11, t.3 £.27-31. C. ruber (Garjajeff) 1901 Ctenacanthus r., Garjajeff in: Trudui Kazan. Univ., v.35 p.17 t.2 £.9, 10, t.3 f. 22—26. Pag. 508. — Add to the literature of 52. Gen. Acanthogammarus Stebb.: 1901 Polyacanthus (non Cuvier & Valenciennes 1831, Pisces!) + Dybowskia (non Dall 1876, Mollusca!) (part.) + Ctenacanthus (non Agassiz 1837, Pisces!) (part.), Garjajeff in: Trudui Kazan. Univ., .35 p.15, 16. Pag. 508 and 512. — Add to the species of 52. Gen. Acanthogammarus Stebb.: 7. A.labbei Chevreux 1903 A. l., Chevreux in: Bull. Mus. Paris, v.9 p.224. A.albus (Garjajeff) 1901 Polyacanthus a., Garjajeff in: Trudui Kazan. Univ., 0.85 p.29 t.2 f.14; t.3 £.41—45. A. balkirii (Garjajeff) 1901 Polyacanthus b., Garjajeff in: Trudui Kazan. Univ., 0.35 p.21t.1£.1; t.2£.15; 1.3 £.46—51 | 1903 Acanthogammarus b., Chevreux in: Bull. Mus. Paris, v.9 p. 224. A.flavus (Garjajeff) 1901 Polyacanthus f., Garjajeff in: Trudui Kazan. Univ., 0.35 p.25 t.2 £. 12; t.3 f.32-36. A. korotneffii (Garjajeff) 1901 Polyacanthus k., Garjajeff in: Trudui Kazan. Univ., 0.35 p.27 t.2 £.16; t.3 f. 58—57. A. maximus (Garjajeff) 1901 Polyacanthus m., Garjajeff in: Trudui Kazan. Univ., 0.35 p.23 t.2 f.13; t.3 £. 37—40. Pag. 509.— Addtotheliterature ofspeciesl.Acanthogammaruscabanisii(Dyb.): 1901 Ctenacanthus e., Garjajeff in: Trudui Kazan. Univ., 0.35 p. 21. Pag. 509. — Add to the literature of species 2. Acanthogammarus zienkowiezii (Dyb.): 1901 Ctenacanthus z., Garjajeff in: Trudui Kazan. Univ., v.35 p.21. Pag. 510. — Add to the literature of species 3. Acanthogammarus godlewskii (Dyb.): 1901 Polyacanthus g. + P. g. var. vietorü, Garjajeff in: Trudui Kazan. Univ., 0.35 p.31. Addenda et Corrigenda 735 Pag. 510. — Add to the literature of species 4. Acanthogammarus radosz- kowskii (Dyb.): 1901 Ctenacanthus r., Garjajeff in: Trudui Kazan. Univ., 0.35 p.21. Pag.511.— Add to the literature of species 5. Acanthogammarusarmatus (Dyb.): 1901 Dybowskia armata + D. a. var. ongureni, Garjajeff in: Trudui Kazan, Univ., v.35.p.38, 39 t.2 f.20; t.3 f. 73—78. Pag. 511. — Add to the literature of species 6. Acanthogammarus parasiticus (Dyb.): 1901 Polyacanthus p., Garjajeff in: Trudui Kazan. Univ,, v.35 p. 31. Pag. 515 and 517. — Add to the species of 1. Gen. Dexamine Leach: 5. D. serraticrus A. Walker 1904 D. s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., ©.2 p.265 t.4 f.24. Near D. spinosa (p. 515). Pag. 519 and 521. — Add to the species of 4. Gen. Polycheria Hasw.: 3. P. atolli A. Walker 1905 P.a., A. O. Walker in: Gardiner,. Fauna Mald. Laccad., v.2 p. 926 t.88 f.1—5. Pag. 521. — Add to the literature of species 1. Guernea coalita (Norm.): ?1904 @. laevis, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., 0.2 p.267 t.4 f.26. Pag. 525. — Add to the literature of species 2. Talitrus alluaudi Chevreux: 1901 T.«a., Chevreux in: Mö&m, Soc. zool. France, v. 14 p.389 f. 1—7. Pag. 530 and 542. — Add to the species of 4. Gen. Orchestia Leach: 24. O.anomala Chevreux 1901 O.a., Chevreux in: M&m. Soe. zool. France, v.14 p.393 f. 8—12. Seems very near Parorchestia hawaiensis (Dana), see p.558 and 735. 25. O. excavata Chevreux 1902 O.e., Chevreux in: Bull. Mus. Paris, v.8 p.521. Pag. 545. — Add to the literature of species 3. Talorchestia deshayesii (Aud.): 1900 Orchestoidea d., A. M. Norman in: Ann. nat, Hist., ser.7 v.5 p. 139. Pag. 552. — Add to the literature of species 17. Talorchestia brito Stebb.: 1900 Orchestoidea: b., A. M. Norman in: Ann. nat. Hist., ser. 7 v.5 p.140. Pag. 555. — Add to the species of 7. Gen. Chiltonia Stebb.: . 2. C. australis (Sayce) 1901 Hyalella a., Sayce in: P.R. Soe. Victoria, v.13 p. 226 t.36 | 1902 Chiltonia a., Sayce in: P. R. Soe. Victoria, v.15 p. 47. 3. C. subtenuis Sayce 1902 C.s., Sayce in: P. R. Soe. Victoria, v.15 p.48 t.4. Pag. 558. — Add to the literature of species 2. Parorchestia hawaiensis (Dana): 1900 Parorchestia h., T. Stebbing in: Fauna Haw., v.2 p.529 t.21e. Pag. 559 and 572. — Add to the species of 11. Gen. Hyale H. Rathke: 23. H. chiltoni G.M. Thoms. 1899 H.c., G. M. Thomson in: Tr. N. Zealand Inst., v. 31 p. 206. 24. H. brevipes Chevreux 1901 H.b., Chevreux in: M&m. Soe. zool France, v.14 p.400 f. 15—18. . 736 Addenda et Corrigenda Pag. 564. — Add to the literature of species 9. Hyale macrodactyla Stebh.: 1901 H. macrodactylus, Chevreux in: Me&m. Soc. zool. France, v.14 p. 397 f. 13, 14. Pag. 565. — Add to the literature of species 11. Hyale prevostii (M.-E.): 1900 H. prevosti, Chevreux in: Rösult. Camp. Monaco, 0.16 p.7 t.1 f.3| 1903 H. nilssoni, A. O. Walker & A. Seott in: H. O. Forbes, Nat. Hist. Sokotra, p.219 t.14A f.3a--3e | 1904 H.n. var.? kuriensis, A. OÖ. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 238. Pag. 567. — Add to the literature of species 14. Hyale grimaldii Chevreux: 1900 H. g., Chevreux in: R&sult. Camp. Monaco, v.16 p.10 t.2 £.2. Pag. 570. — Add to the literature of species 19. Hyale camptonyx (Heller): 1900 H.c., Chevreux in: R&sult. Camp. Monaco, v.16 p.12 t.2 £.3. Pag. 574. — Add to the literature of species Hyale stebbingi Chevreux: 1900 H. s., Chevreux in: R£sult. Camp. Monaco, v.16 p.8 t.2 £.1. Pag. 574 and 580. — Add to the species of 12. Gen. Hyalella S. I. Sm.: 16. H. riehardi Chevreux 1902 .H.r., Chevreux in: Bull. Soc. zool. France, v.27 p.223 f.1, 2a—e. A littoral species from Isle of Alboran, between Spain and Moroeco. 17. H. neveu-lemairei Chevreux 1904 AH. n.-I., Chevreux in: Bull. Soe. zool. France, ».29 p.131 f.1, 2a—d. From Lake Titicaca. 18. H. pernix (Moreira) 1903 Allorchestes p.. C. Moreira in: Arch. Mus. Rio Jan., v.12 p.187 t.1, 2. Rio de Janeiro, Brazil, 2240 m above sea-level. Pag. 585. — Add to the literature of species Allorchestes littoralis Stimps.: 1905 A. 1, Hyale 1., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p- 472 f.; t.3 f.2. Pag. 586 and 603. — Add to the genera of 33. Fam. Aoridae: 8. Gen. Coremapus Norm. 1905 Coremapus (Sp. typ.: C. versieulatus), A. M. Norman in: Ann. nat. Hist., ser.7 v.16 p. 78. 1. C. versiculatus (Bate) 1905 ©. v., A. M. Norman in: Ann. nat. Hist., ser. 7 v.16 p.78. Add to this species the literature of Microdeutopus versiculatus (Bate) from p. 593. : Pag. 593. — Add to the literature of species 10. Mierodeutopus damno- niensis (Bate): 1905 M. danmonensis, S. J. Holmes in: Bull. U. S. Bureau Fish., .24 p. 515 f. - Addenda et Üorrigenda 737 Pag. 594 and 599. — Add to the species of 4. Gen. Lembos Bate: 10. L. smithi (S. J. Holmes) 1903 Autonoe s., S. J. Holmes in: Amer. Natural, 0.37 p.290 | 1905 A.s., S.J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.516 f£. 11. L. podoceroides A. Walker 1904 L. p., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.279 t.6 £.39. Near L. websterii (p. 599). 12. L. chelatus A. Walker 1904 L. c., A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.280 t.6 f.40. Pag. 603 and 630. — Add to the genera of 34. Fam. Photidae the follow- ing 4 genera: 11. Gen. Cheiriphotis A. Walker 1904 Cheiriphotis (Sp. un.: C©. megacheles), A. O. Walker in: Herdman, : Rep. Ceylon Pearl Fish., v.2 p.234, 283. Near Mieroprotopus Norm. (p. 604). 1. C. megacheles (Giles) 1885 Melita m. (3), G. M. Giles in: J. Asiat. Soe. Bengal, v.54 p.70 t.3 | 1887 Eurystheus hirsutus (2), G. M. Giles in: J. Asiat. Soc. Bengal, v.56 p. 227 t.8 | 1904’ Cheiriphotis megacheles, A.O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 284 t.6 f.42. Add to this species the literature of Eurystheus hirsutus Giles from p. 615. : 12. Gen. Audulla Cheyreux 1901 Audulla (Sp. un.: A. chelifera), Chevreux in: M&m. Soe. zool. France, v.14 p.431. 1. A. chelifera Chevreux 1901 A. c., Cheyreux in: M&m. Soc. zool. France, v.14 p.432 £. 56-65 | 1903 A.c.. A.O. Walker & A. Seott in: H. O. Forbes, Nat. Hist. Sokotra, p. 225 t.14B f.2a,b. 13. Gen. Bonnierella Chevreux 1900 Bonnierella (Sp. un.: B. abyssi), Chevreux in: Rösult. Camp. Monaco, e.16 p. 97. 1. B. abyssi (Chevreux) 1900 B.a., Chevreux in: Result. Camp. Monaco, v,16 p.97 t.11 £.3. Add to the literature of this species that of Podoceropsis abyssi Chevreux from p. 619, except Gammaropsis abyssorum J. Bonnier. 2. B. abyssorum (Bonnier) 1900 B. a., Cheyreux in: R£sult. Camp. Monaco, v.16 p. 99. 14. Gen. Chevalia A. Walker 1904 Chevalia (Sp. un.: C. aviculae), A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.234, 288. Intermediate between Fam. Photidae and Fam. Corophiidae. 1. C. aviculae A. Walker 1904 C.a., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 288 t.7 £.50; 1.8 £.80. Das Tierreich. 21. Lief.: T.R. R. Stebbing, Amphipoda I. 47 738 Addenda et ÜCorrigenda Pag. 606 and 609. — Add to the species of 2. Gen. Photis Kroyer: 6. P. longimana A. Walker 1904 P. longimanus, A. O. Walker in: Herd- man, Rep. Ceylon Pearl Fish., v.2 p. 286 t.7 f. 44. P.nana A. Walker 1904 P.n., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., 0.2 p. 287 t.7 £.45. Generie position doubtful. Pag. 611 and 618. — Add to the species of 4. Gen. Eurystheus Bate: 14. E. dentatus (Chevreux) 1900 Gammaropsis dentata, Chevreux in: Result. Camp. Monaco, v.16 p. 93 t.12 £.1. 15. E. tenuicornis (S. J. Holmes) 1904 Gammaropsis t., S. J. Holmes in: Harriman Alaska Exp:, v. 10 p.239 f. 124. Compared with Megamphopus (Megamophus, laps.!) eornutus Norm. (p.621). 16. E. zeylanicus (A. Walker) 1904 Gammaropsis z.. A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish.. v.2 p. 282 t:6 f.4l. 17. E. gardineri (A. Walker) 1905 Gammaropsis g., A. O. Walker in: Gardiner, Fauna Mald. Laccad., v.2 p. 929 t.88 f.11—14, 16, 17. Pag. 623 and 624. — Add to the species of 8. Gen. Protomedeia Kıayer: 2. P. grandimana Brüggen 1905 P.g., Brüggen in: Trav. Soe. St.- Petersb., ®©.36 nr.1 p.6, 9; t.f.5. Pag. 627. — Add to the literature of species 3. Leptocheirus pinguis (Stimps.): 1905 Ptilocheirus p., S.J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.522 f.; 1.12 £.3. Pag. 632 and 641. — Add to the species of 1. Gen. Ampithoe Leach: 18. A. alluaudi (Chevreux) 1901 Amphithoe a., Chevreux in: M&m. Soe. zool. France, v.14 p.418 f. 40—45. 19. A. intermedia (A. Walker) 1904 Amphithoe i., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.290 t.7 f.46. Between A. rubricata (Mont.) and A. vaillantii (H. Luce.) (p. 639). Pag. 634. — Add to the literature of species 4. Ampithoe longimana (S.1.Sm.): 1905 Amphithoe l., S. J. Holmes in: Bull. U. S. Bureau Fish., p. 509 f.; t.13 £.2. Pag. 635. — Add to the literature of species 6. Ampithoe valida (S. I. Sm.): 1905 Amphithoe v., Paulmierin: Bull.N. York Mus., Bull. 91 Zool.12, p.164 f. Pag. 642 and 643. — Add to the species of 2. Gen. Pleonexes Bate: 2. P. ferox Chevreux 1902 P. f., Chevreux in: C.-R. Ass. Franc., Sess. 30 0.2 p.697 t.5 f.28—2i. Pag. 644. — Add to the species of 3. Gen. Grubia Üzern.: 2. G. hirsuta Chevreux 1900 @.h., Cheyreux in: Bull. Soc. zool. France, v.25 p.95 .15. 3. G. mierophthalma Chevreux 1901 @. m., Cheyreux in: Möm. Soc. zool. France, v.14 p.422 f.46--49 | 1905 G. m., A. O. Walker in: Gardiner, Fauna Mald. Laccad., v.2 p. 930 f. 142. 4. G. longieornis A. Walker & A. Scott 1903 @.1., A. O. Walker & A. Seott in: H. O. Forbes, Nat. Hist. Sokotra, p. 226 t. 14B f.3a—3d. Perhaps a synonym of Amphithoides longicornis Kossm. (p. 645). Pag. Pag. Addenda et Corrigenda 739 644 and 645. — Amphithoides comptus (S. I. Sm.) is to be accepted among the species of the 3. Gen. Grubia Üzern.: 5. G. compta (S. I.Sm.). Add to the literature of this species: 1905 @. e., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.510 f£. 645. — Put after the 4. Gen. Amphithoides Kossm.: 4*, Gen. Paragrubia Chevreux 1901 Paragrubia (Sp. un.: P. vorax), Chevreux in: M&m. Soc. zool. France, v.14 p. 426. 1. P. vorax Chevreux 1901 P.v., Chevreux in: M&m. Soe. zool. France, v.14 p.427 £. 50-55. Pag. 645. — Add to the literature of species 1. Sunamphitoe pelagica (M.-E.): Pag. Pag. Pag. 1900 Sunamphithoe p., Chevreux in: R£sult. Camp. Monaco, v.16 p. 102 t.11 f.4. 652. — Add to the literature of 4. Gen. Jassa Leach: 1905 Bruzeliella (Sp. typ.: B. falcata), A. M. Norman in: Ann. nat. Hist., ser.7 v.16 p.83. 654. — Add to the literature of species 4. Jassa pulchella Leach: 1816 Jassa p., Leach in: Enc. Brit., ed. 5 suppl. p.426 (with no other species of Jassa) | 1829 J. p., Latreille in: G. Cuvier. Rögne an., n. ed. v.4 p. 122 (with no other species of Jassa) | 1905 Bruzeliella falcata, A. M. Norman in: Ann. nat. Hist., ser.7 0.16 p.83, 92. . 655. — Add to the literature of species 5. Jassa pusilla (O. Sars): 1905 Bruzeliella p., A.M. Norman in: Ann. nat. Hist., ser. 7 v.16 p. 84, 92. . 655. — Add to the literature of species 6. Jassa ocius (Bate): 1905 Bruzeliella ocia, A. M. Norman in: Ann. nat. Hist., ser.7 v.16 p.84, 92. . 652 and 656. — Add to the species of 4. Gen. Jassa Leach: 8. J. goniamera A. Walker 1903 J.g., A. O. Walker in: J. Linn. Soe., 2.29 p.61 t. 11 1. 98-106. 9. J.marmorata S. J. Holmes 1903 J. m., S. J. Holmes in: Amer. Natural,, v.37 p.289 | 1905 J. m., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.511 f. . 657 and 662. — Add to the species of 5. Gen. Ischyrocerus Kröyer: 10. I. commensalis Chevreux 1900 I. c.,-Chevreux in: Rösult. Camp. Monaco, v.16 p.104 t.12 f.2. 662 and 693. — Add to the genera of 38. Fam. Corophiidae: 12. Gen. Grandidierella Coutiere 1904 Grandidierella (Sp. un.: @. mahafalensis), Coutiere in: Bull. Soe. philom., ser. 9 v.6 p. 166. 1. G. mahafalensis Coutiere 1904 G. m., Coutitre in: Bull. Soc. philom., ser.9 ©.6 p. 166 f.1—19. Compared with Camacho bathyplous Stebb. (p. 665), and Chevreuxius grandimanus Bonnier (p. 670). 47% 740 Addenda et Corrigenda Pag. 667. — Add to the literature of species 3. Cerapus tubularis Say: 1905 ©. t., S. J. Holmes in: Bull. U, S. Bureau Fish., v.24 p. 517 £. Pag. 668 and 669. — Add to the literature of species 6. Cerapus calamicola (Giles) the literature of species 4. C. flindersi Stebb. (9), which is to be dropped, and: 1892 Cerapus flindersi (3), Chilton in: Ree. Austral. Mus., v.2 p.1t.1| 1904 ©. calamicola, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p. 293. Pag. 671 and 674. — Add to the species of 6. Gen. Eriethonius M.-E.: 7. E. rubricornis (Stimps.) 1905 Erichthonius r., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.518 f£. Add to the literature of this species from species 5. Eriethonius hunteri (Bate) (p. 673): 1853 Cerapus rubricornis, Stimpson in: Smithson. Contr., v.6 nr. 5 p.46 f.33 | 1867 ©. r., O.rubiformis, Packard in: Mem. Boston Soe., v.1 p. 297. Pag. 671. — Add to the literature of species 1. Eriethonius brasiliensis (Dana): 1905 Erichthonius minax, 8. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p.519 £. Pag.672.— Addtotheliterature of species3. Eriethoniusmacrodactylus (Dana): 1904 Erichthonius m., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.292 t.7 £.48. Pag. 682 and 684. — Add to the species of 10. Gen. Siphonoecetes Kroyer: 6. S. orientalis A. Walker 1904 S$. o., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.294 t.7 £.49. 7. S. smithianus Rathbun 1878 8, cuspidatus (non Aug. Metzger 1871!), (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p.501, 566 | 1905 S. smithianus, M. J. Rathbun in: Pap. Boston Soe., ©.7 p. 74. Pag. 683. — Subtract from the. literature of species 3. Siphonoecetes colletti Boeck: 1873 S. cuspidatus (non Aug. Metzger 1871!), (S. I. Smith in:) A. E. Verrill in: Rep. U. S. Fish Comm., v.1 p. 501, 566. Pag. 685 and 692. — Add to the species of 11. Gen. Corophium Latr.: 13. C. maeoticum Sowinski 1898 ©. m.. Sowinski in: Bull. Ac. St. Petersb., v.8 p.362 t.1 f.1—5. 14. C. triaenonyx Stebb. 1904 C. t., T. Stebbing in: Spolia Zeyl., v.2 p- 25 t.6A. Pag. 692.— Add to the literature of species Corophium acherusicum A. Costa: 1900 C. a., Chevreux in: R£sult. Camp. Monaco, v. 16 p. 109. Pag. 692. — Add to the literature of species Corophium eylindricum (Say): 1905 ©. c., S. J. Holmes in: Bull. U. S. Bureau Fish., v.24 p. 521 f. | 1905 C. c,, Paulmier in: Bull. N.-York Mus., Bull. 91 Zool.12 p. 167 £.37. Addenda et Corrigenda 741 Pag. 701 and 706. — Add to the species of 5. Gen. Podocerus Leäch: 11. P. synaptochir (A. Walker) 1904 Platophium s., A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.296 t.8 £. 52. 12. P. zeylanicus (A. Walker) 1904 Platophium zeylanicum, A. O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v.2 p.297 t.8 f. 53. Pag. 703. — Add to the literature of species 5. Podocerus chelonophilus (Chevreux & Guerne): 1900 Platophium chelonophilum, Podocerus chelonophilus, Chevreux in: Result. Camp. Monaco, v.16 p.115 t.13 f.2, t.14 £.7; p. 166. Pag. 704. — Add to the literature of species 8. Podocerus laevis (Hasw.): 1904 Platophium laeve, A. O. Walker in: Herdman, Rep. Üeylon Pearl Fish., v.2 p. 295 t.7 £.51. . Pag. 714 and 715. — Add to the species of 1. Gen. Hyperiopsis 0. Sars: 2. H. australis A. Walker 1906 H.a., A. O. Walker in: Ann. nat. Hist., ser. 7 v.17 p. 454. Liljeborgia aequabilis Stebb. 1888 Z. a., T. Stebbing in: Rep. Voy. Challenger, v.29 p.988. Moera approximans Hasw. 1879 M.a., Haswell in: P. Linn. Soc. N.S.Wales, v4 p.334 t.21 £.3. Cerapus bidens Üzern. 1868 €; b., Özerniavski in: Syezda Russ. Est., Syezda 1 Zool. p. 98. Amphithoe boecki Della Valle 1893 A. b., A. Della Valle in: F. Fl. Neapel, v. 20 p. 462, 918 t. 57 £.36. Maera bruzelii Stebb. 1888 M. b., T. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1014 t. 97. Orehestia californiensis Dana 1854 O.c., J. D. Dana in: P. Ace. Philad., 0.7 p. 177. Lada chalubinskii Wrzesn. 1879 L. chalubinskiü, Wrzesniowski in: Zool. Anz., v.2 p- 322. Atylus comes Giles 1888 A.c., G. M.Giles in: J. Asiat. Soc. Bengal, v. 57 p. 248 t. 10 £. 8—10. . Amphithoe costata M.-E. 1830 A.c., H. Milne Edwards in: Ann. Sei. nat., v.20 p. 379 t. 10 £. 14—16. Calliope didactyla G. M. Thoms. 1879 C©.d., G. M. Thomson in: Tr. N. Zealand Inst., v.11 p.240 t. 10c f.3 a—e. Maera diversimanus Miers 1884 M.d., Miers in: Rep. Voy. Alert, p.567 t.52f.D. Amphitopsis dubia Vosseler 1889 A.d., Vosseler in: Arch. Naturg., v, 551 p. 156 t. 8 f. 32— 36. ‚Enone Risso 1826 E. (Sp. un.: E. punctata), A. Risso, Hist. nat. Eur. merid., v.5 p. 96. Tryphosa erosa Meinert 1890 7‘. e., Meinert in: Udb. Hauchs, v.3 p.155 t.1 f. 25—29. Maera faseiculata (G. M. Thoms.) 1880 Megamaera f., G. M. Thomson in: Ann. nat. Hist., ser.5 v.6 p.5 t.1 f.5 | 1893 Maera f., G. M. Thomson in: P.R. Soc. Tasmania, 1892 p. 28. Örchestia gayi Nic. 1849 O.g., H. Nieolet in: Gay, Hist. Chile, v.3 p. 284. Iphimediopsis geniculata Della Valle 1893 I.g., I.eblanae, A. Della Valle in: F. Fl. Neapel, 0.20 p.19, 933. Podoprionides incerta A. Walker 1906 P.i., A. O. Walker in: Ann. nat. Hist., ser. 7 v.17 pP. 457. Melita insatiabilis Fr. Müll. 1864 M.i., Fritz Müller, Für Darwin, p. 18 f. 11. Lada Wrzesn. 1879 L. (Sp. un.: L. chalubinskii), Wrzesniowski in: Zool. Anz., v.2 p.822. Melita leonis J. Murdoch 1885 M.I., J. Murdoch in: P. U. S. Mus., v.7 p. 521. Amphithonotus levis G. M. Thoms. 1879 A.l, G.M. Thomson in: Ann. nat. Hist., ser.d v.4 p.330 t.16 f. 1—4. 742 Addenda et Corrigenda Melita messalina Fr. Müll. 1864 M. m., Fritz Müller, Für Darwin, p.18 £. 10. Gammarus multifasciatus Bate 1862 G.m., (Stimpson in MS.) Bate, Cat. Amphip. Brit. Mus., p. 211 t. 37 £.7. Gammarus nolens Johnst. 1827 G. n., G. Johnston in: Zool. J., v.8 p-179 | 1857 he Anony&? n., A. White, Hist. Brit. Crust., p. 169. Protomedeia nordmannii (M.-E.) 1862 P.n., Bate, Cat. Amphip. Brit. Mus., p. 171. Ichthyomyzocus ornatus E. Hesse 1873 I. o., E. Hesse in: Ann. Sei. nat., ser. 5 v.17 ar. 7 p.5t.4f.l. Concholestes pallidus (O. Sars) 1890 C. p., G.M.Giles in: J. Asiat. Soc. Bengal, v.59 p. 64. Pleustes parvus Boeck 1876 P.p., A. Boeck, Skand. Arkt. Amphip., v.2 p. 305 t. 23 f.5 (? P. panoplus juv.). Cerapus pelagicus (Leach) 1840 C.p., H. Milne Edwards, Hist. nat. Crust., v.3 p.61. Gammarus plumicornis A. Costa 1853 @. p., A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p. 176. Melita podager (M.-E.) 1862 M.p., Bate, Cat. Amphip. Brit. Mus., p. 184 t.33 £.5. Podoprionides A. Walker 1906 P. (Sp. un.: P. incerta), A. O. Walker in: Ann. nat. Hist., ser. 7 v.17 p. 457. Grayia pugettensis (Dana) 1862 @.p., Bate, Cat. Amphip. Brit. Mus., p. 101 t. 14 f. 4. Oedicerus puliciformis Giles 1888 O.p., G. M. Giles in: J. Asiat. Soc. Bengal, v.57 p.248 1.7 £.5, 6. Enone punctata (Risso) 1826 E.p., A. Risso, Hist. nat. Eur. mörid., v.5 p. 96. Gammarus redmanni Bate 1862 @. r., (Leach in MS.) Bate, Cat. Amphip. Brit. Mus., p. 212 t.37 £.9. Gammarus robustus S. I. Sm. 1874 @. r., 8. I. Smith in: Rep. U, S. geol. Surv. Terr.,. 1873 p. 610 t.2 f. 7—12. Talitrus rubropunctatus Risso 1816 7. r., Risso, Orust.. Nice, p. 127. ' Gammarus spetsbergensis Vosseler 1889 @. s., Vosseler in: Arch. Naturg., v. 551 p.158 1.8 £.2531. Lysianassa spinifera Stimps. 1853’ L.s., Stimpson in: Smithson. Contr., v. 6 nr.5 p.49. Gammarus spinipes Johnst. 1829 @. s., G. Johnston in: Zool. J., v.4 p. 417. Ichthyomyzocus squatinae E. Hesse 1873 I. s., E. Hesse in: Ann. Sei. nat., ser.5 v.17 or.7 p.12 t.4 £. 19—27. ÖOniseus stroemianus O. Fabr. 1780 O.s., O. Fabriecius, Fauna Groenl., p. 261. Gammarus subtener Stimps. 1864 @. s., Stimpsen in: P. Ace. Philad., B. 157. Talitrus tripudians Kreyer 1845 T. t., Kreyer in: Naturh. Tidsskr., de 2v.1p.311t.3 f.2 a—e. Gammarus trunceatus Viv. 1805 @.t., Viviani, Phosphor. Maris, p-8 1.2 £.5, 6. ‚Gammarus unguiserratus A. ÜUosta 1853 @.u., A. Costa in: Rend. Soc. Borbon., n. ser. v.2 p.176. ‚Iphimedia vulgaris Stimps. 1853 I. v., Stimpson in: Smithson. Contr., v.6 nr.5 p.53. Alphabetical Index. page abbreviata (Urothoe) .... . .- 129 abbreviatus (Gammarus) . . . . 462 abdita (Cerapodina). -. » .»...». 668 abditus (Cerapus). . . ».... 668 abditus (Cerapus) . . - » 2... 671 abditus (Eriehthonius). . . . . . » 671 aberrans (Leptocheirus). . . . - 626 aberrans (Protomedeia) .. . - . - 626 abseisa (Metopa) . . .:..... 724 abyssalis (Gammarus borowskii var.) 498 abyssalis (Pleuracanthus borowskii var.) 733 abysei; (Andsnis)- . 2. 3 nu 94 abyssi (Andaniexis). . » -» :». 94 ahyssr (AstyFa) -- isn 2 278 abyssi (Bonnierella). .... . . 737 SbyRsi (ByblBe) : 2er 113 abyssicola (Ampelisca) . . . - 104 abyssicola (Cressa) .. . . ... 192 abyssicola. (Danaia) . . . » . ....19 abyssicola (Gitana) . .. :... 156 abyssi (Euryporeia) . . » .» :»... 43 #BY6881:(H81166) 2... ER. ,?) Shyasi. (Harpinla) .» - .2-2.ur,%0% 144 abyssi (Hippomedon) . ......- 43 abyssi (Ingolfiella) -. . - . .» . .. 726 abyssi (Lysianassa) . . » 2... 43 abyssi (Normanion). . ».... 718 abyssinus (Oniseus) ». » » ».. 2... 859 abyssi (Paratryphosites). . . -» - 43 abyssi (Pardalisca) . . ..... 222 abyssi (Pardalisea) .... . - 225, 228 abyssi (Podoceropsis) . . . . 619, 737 abyssi (Tryphosella) . ..... 720 abyssorum (Acanthozone) . . . . . 315 abyssorum (Andania) ....... 96 abyssorum (Anonyx). . » » 2... 84 abyssorum (Bonnierella) 737 abyssorum (Gammaropsis) . . . 619, 737 abyssorum (Gammarus ussolzewii var.) 488 abyssorum (Mesopleustes). . . . 315 abyssorum (Orchomene) . . ... - 84 abyssorum (Orchomenopsis). . . 84 abyssorum (Pleuste) ....... 315 abyssorum (Stegocephalus) . . .» » 96 page Acanthechinns. = = ...5.. 0 ..0.. 326 Acanthogammarus . .... 508, 734 Acanthonotosoma . » » » „.. . 218,299 Acanthonotozoma.. . »......- 218 Acanthonotozomatidae .. . 210 BAosnthonome, u. ae 218 acanthophthalmus (Amphithonotus) . 515 acanthopoda.(Iphigenella). . . . 447 Acanthosoma, 3 » sen iss 324 Acanthostepheia_. .... . 253, 726 Acanthostephia . . .. - ». 2... 253 Aranihozoms, .. - ce 218 Acanthozone . ... . 287,299, 308, 324 acanthurus (Tiron) . . ..... 276 En VE Er SE . ...254 EEREODRR: 0 et 254, 726 En 1 VE a ee 248 acherusica (Audouinia) . ». .»... 692 acherusicum (Corophium) . . 692, 740 Maldoabonin4.,- 2: 4 Se ns 14 Aecidostomum. . ... -» EL. acinaces (Ampelisca) . . ... . 108 B6o0BtioBlöma'.. 2. \ ereliente 15 Aconliosioms .;. : .-'. =. 2 =. 16 Actinsaeanthus.:. „nut. = 326 acudigitata (Callimerus) . . ». . - 150 aculata (Rhachotropis). .. . . - - 348 aculeata (Pontogeneia). . . 348,350, 351, 351, 354 aculeata (Rhachotropis).. . - - . 348 aculeata (Tritropis) . ». - »...» - 348 aculeatus (Acanthonotus) - - » » . 348 aculeatus (Amphithonotus) . . . 348, 352 aculeatus (Oniscus) . . » » +». - 348 aculeatus (Rhachotropis). . . - 348,351 acutifrons (Bathymedon) 257 acutifrons (Halimedon) . . .». . - 251 acutifrons (Westwoodilla). . . . 251 acutus (Hoplonyx) - ». .»...... 75 acutus (Tmetonyx) - . -» »»» . 75 adarei (Tryphosa). ....... 720 adhaerens (Stenothoe). . . . . - 199 WERHBOFNBITT LT EB ee 243 aequabilis (Liljeborgia) . - » » - - 741 744 Alphabetical Index page aequicornis (Ampelisca) 105, 105, 106, 106 aequicornis (Ampelisca). . . . . 106 aequicornis (Halicreion). . . . . 247 aequicornis (Idunella). . . .. . 234 aequicornis (Metopa) . . ... . 180 aequicornis (Monoculodes) . . . . - 247 aequicornis (Oediceros) . . . . 247,267 aequimanus (Monoeulodes). . . . - 237 aequimanus (Niphargoides) . . . 453 aequimanus (Oedicerus) . - » :. - 238 aequimanus (Perioculodes) . . . 238 aeqvicornis (Ampelisca) . » . .. . 106 aeqvicornis (Idunella) .. . ... . 234 aeqvieornis (Lilljeborgia) . . . . . . 254 aeqvicornis (Metopa) . : 2.2... 180 aeqvimanus (Niphargoides). . . . - 453 afer (Eurystheus) . . : .» 2... 612 afer (Lemboides) : . : . .... 600 affine (Corophium) . . . . 2. .688 affinis (Amathillina). . : .... 501 affinis (Amathillopsis). . :. . - . 385 affinis (Anonyx). . -» .... 2,322, 08 BIS KAnoRyX) ..... 00:0 5 66 Minis (Byblis): ... ».. 4.2. 0% 114 affınis (Centromedon) » .» .... - 66 affınis (Elasmopus) . » .. 2... 444 affinis (Eusirus). . . » :... . 238 affinis (Gammarus) 2. .2..... 472 affinis (GAlycerina). . -»...2. 61 affınis (Ichnopus) . » -» » . 2... 53 affinis (Leucothoe) . . . .... 168 affinis (Lysianassa) . . . .... 87 affinis (Metopa) . - - - . 2..,% 176 #Hinis (Metopa). . . . „u. 177 affınis (Monoeulodes) . . . : ... 261 affınis (Oediceros)... . . 258, 259, 261, 261, 262, 263, 265 affinis (Onisimus) . » . : 2... 28 affinis (Pontoporeia). . . :... 128 affınis (Pontoporeia). : » 2.2... 128 ae Plahtras); : 1:2 2.080 5 524 afra (Gammaropsis) . . » » 2... 612 afra (Protomedeia) . .. ... 612, 613 africana (Talorchestia) . . . . . 554 africanus (Pseudoniphargus) . . 729 agassizi (Ampelisea). . : .... 111 Spass (Byblis) -. 3°. 322.80 8 111 agilis (Megaluropus) . . .... 420 afilis (Orehestis) 52,5... 540 Rylaors ZT NEE NEN 786 aheneus (Echinogammarus) . . . 487 aheneus (Gammarus) . ...... 487 aheneus subvar. miniatus (Gammarus) 487 aheneus subvar. suceineus (Gammarus) 487 aheneus var; setosus (Gammarus) . . 487 alaskensis (Stenothoe). . . . . . 725 alba (Lysianopsis) . . ..... 718 page alberti (Paracallisoma) . .... 719 albidar Mas) et. ae 440 albida (Megamoera). . ... 2... 440 aibidne (ABBmyX) . (2... 00% 75 albidus (Gammarus). . ». ..... 440 albidus (Hoplonyx) . . » .».... 75 albidus (Tmetonyx). ...... 75 albinus (Gammarus) . . .. 2... 455 albinus (Ommatogammarus). . . 455 albomaculata (Amphithoe) . . . 639, 642 albula (Gammarus flori var.). . . . 496 albulus (Heterogammarus) . . . 496 albus (Acanthogammarus). . . . 784 albus (Anonyz) . :.::..., 85 albus (Polyacanthus) . ...... 734 alderii (Metopa). . .» : . 2... 175 älderü (Metopa) .. :. 2220. 182 alderii (Montagua) . . 2 2... 175 alderi (Megamoera) . . ı..... 426 älderi (Metopa). . ..:.... 175, 176 alderi (Probolium) . . .» :. . FTIR alderi (Stenothoe). -. .». 2.2. .% 175 alexandri (Constantia branickii var.) 894 algensis (Cancer) . . ..... 2-24 028 algensis (Lusyta) . .. . . a 3; algensis (Lysita) . : -» 2232. 715 algicola (Bianeolina) . » »..:.. 647 algicola (Mierodeutopus). . .» . . » 593 algicola (Neobule): . . 2 2... 556 algicola (Neobule (Hyale)). . .-. . 556 AEDrotUE . 50. BEE NER 85 alicei (Cyphocaris) : . 2 :..'5» 717 Bone... ER 63 Allorehestes =. 3 0.0 8 Wed 559 MHorchestes. :-. »:.. E00. /.2% 581 Miorchesiiua +2... Es 39 787 alluaudi (Amphithoe) . . .» . . . . 738 alluaudi (Ampithoe). . .... . 788 alluaudi (Talitrus). . . .. 525, 735 altamarina (Kroyera) : . ..... 240 altamarinus (Pontocrates) . . . . 240 Amanonyz RR HFIENN 787 BENaryilis Hs A 23 Amathia . - ... a a a 886 Anathllls. ...., si 3 ER Minashilline 2... SRH DEE 499 Anathillinella : ... 2 .1072%7202.227 208 Mmashrillopsis....., NV eg 384 amaurus (Anonyx) : . :...x 85 Biabesiar. EHE 51,719 ambigua (Iphimedia) . . .:... 213 ambigua (Panoploea) . . .... 218 amblyops (Ampelisca). . . . 105,722 amblyops (Normanion). . . ...» . 42 amblyops (Orchomene) . . . . . 46 ambulans (Orangonyx). : » ». .» - 369 ambulans (Gammarus). . .» ... .» 369 na Alphabetical Index page ambulans (Goplana). : : » . ..... 869 ambulans (Synurella) . . . . . . 369 amethystinus (Gammarus) . . . . - 456 amethystinus (Ommatogammarus) 456 amoena (Melita). . . »...... 426 Ampelisca ..... : . 98, 722 Rmpoelisesäds 53 usw. 97 Ampelisecaidae. .... re Ampeliseidae. : .:..: ..... 97. Ampeliseides. ;, .: @u2..0% 97 BEDehHacinE 3a 97 Bapeliscinde u un Di 97 Ampeliseinf „ra 97 melisin = 7 4... dr eh 98 ‚ Amphilochidae. ....... 148 mphilochinsae. &:'.% 2.34 148 Amphiloehoides. . : .: .. . 152, 723 Amphiloehus : +... 8.35% 149, 723 Bmphipoda ı .'..234%:827 ö 1 Amphipoda Gammarina ... . 5 N BE Er ee 7 512, 631 =Aamphithoidae 4 . ., 2.%% . 681 Amphithoides. .. .. » an Amphithonotus . . . : 22... 514 mphithopeis.z ...:: wir sid, 289 Amphithopsis. . . . . 295, 304, 811, 817 ar 632 uhitonotum-: >"... 4. en 514 N RE Ve 787 MERERIBOB 4-3: 3.4: 631, 738 Ampitholdab. Ya er 631 ee VE ER Er ae yet 98 ampulla (AnonyxX). . ». :... 54,77 ampulla (Aspidopleurus) a ..9 ampulla (Cancer) . : : 2.2.2... 08 ampulla (Cancer (Gammarellus)) . . 89 ampulla (Gammarus) . . 2». ... 89 ampulla (Lysianassa) ....... 89 ampulla (Phippsia) . ...... 89 ampulla (Stegocephalus) .. .. . 89, 91 ampulloides (Anonyx). .. :.. 55 Anamizidse, : „30%. 170 BaniKie 22, 170, 724 ‚andamanense (Cyrtophium). . : . . 702 andamanensis (Podocerus) . . . 702 Bmdahla. = . euere .. 92,9 Andale eier teisn 93 HARRIS», :. 6 es 94 Raameden- une d 96 BHIANIOBEIR NG. 2 yet 92 Andaniotes . ... . gr, 96 andina (Amphithoe). . ...... 578 andına (Hyalella).-.. .....: 578 andrusowi (Atylus) -. -...... 331 andrussowi (Gammarus) 469 anguipes (Ischyrocerus) . . .. . » 654 anguipes (Ischyrocerus). . .. - 658 745 page anguipes (Podocerus) -. . . . - 651, 658 angulata (Tryphosa). . ... . 270 angulata (Tryphosella). . ... .. 70 angulatus (Anonyx) . : 2. .... 70 angulosa (Amathilla) . ...... 387 angulosus (Gammarellus) . . . » 387 angulosus (Gammarus). . . ».. . 387 angustifrons (Synopia) . ... . 272 angustus (Allorchestes) . . . : . 584 angvipes (Ischyrocerus) . . ». » . 658 anisochir (Gammarus) . . .» ».» . 423 anisochir (Maera) . . 2 2.... 423 anisochir (Melita). . 2 ...:. 423 De a ERTL Si 642 anisopus (Amphithöe (Amphitonotus)) 517 anisopus (Dexamine) : . ... . 517 annulatus (Anonyx). . . .: ... 86 annulatus (Gammarus) . : . . . 463 anomala (Ampelisca) . . .... 106 anomala (Ampelisca) .»..... 722 anomala (Autonoe) . . .»... 2... 591 anomala (Halicoides) .. . ... . 221 anomala (Orchestia). : - .» -. . 735 anomalus (Amphilochus). . . . . . 723 anomalus (Gammarus). - :.»... 591 anomalus (Gammarus (Gammaropsis)) 591 anomalus (Haliceoides). : . .. : 221 anomalus (Microdeuteropus) . . . . 591 anomalus (Microdeutopus) . . . 591 anomalus (Microdeutopus) . . . 593,593 BHONYX 2:5. TE 53 ISBN. 2 0.202 0 SEHEN Ei 56 anonyx (Cyphocaris) . . .... 29 antarctica (Dexamine). »..:..:. 520 antaretica (Leucothoe) . . .. . 168 antarctica (Polycheria) . .. . . 520 antarctica (Tritaeta). - - » .. >. 520 antareticus (Atylus) . . .».. 520, 728 antareticus (Eusirus) - . : . . . 340 antarcticus (Eusirus euspidatus var.) 340 antennaria (Harpinia). . . .-. . 143 äntennatus (Crangonyx) - . . . +» - 390 antennatus (Eucrangonyx). . 390, 731 antennatus (Niphargus) . . :.. . 731 antennipotens (Anonyx) » » ... 64 antennipotens (Pseudotryphosa). . . 64 antennipotens (Tryphosa) . . .. . 64 antennipotens (Tryphosella) . .. . 64 antennulariae (Stenothoe) - . . . 195 antiqua (Apherusa) : . : -:... 727 antiqua (Phaedra)..: .:» 2... 727 nt RT ET ar N 587 IEBEERBS er 585, 736 BREPBEOBB SS BEER 586 IEBHAFRBR 5 25er 304, 727 BDOBEAHEONYZ..: : 22. SE 370 appendiculata (Lysianassa). . :.. 54 746 Alphabetical Index page page appendiculata (Melita) . ... . 428 | armata (Stimpsonella) ....... 589 appendiculata (Tritropis). . . - . » 347 | armata (Talorchestia) . .... . . 547 appendieulatus (Ceradocus). . . . - 428 | armata (Thalorchestia). . . » ... 547 appendieulatus (Cleonardo) . . . 347 appendieulatus (Gammarus) . . . . 428 appendiculatus (Maera) . ...». 428 appendiculosa (Lysianassa). . . . . 54 appendieulosus (Anonyx). . . . . . 54 approximans (Moe) . ...... 741 aquaticus (Gammarus) . . . 2... 474 aquilex (Niphargus). . . .... 406 aquilex (Niphargus). ...».... 410 aquilina (Amphithoe) . . ..... 565 adullina IHyvaloy.. 2.10. 565 aralensis (Gammarus) . . » 2... 459 aralocaspius (Gammarus). . . .» .» . 458 araneolus (Gammarus) . » -» 2...» . 479 araneolus (Poekilogammarus) . . 479 araneolus var. ephippiatus (Gammarus) 479 araneolus var. quinquefaseiatus (Gam- a a 479 IEEBROBE ee a ET 98 aretica (Autonoe) . » 2... 2n% 595 arctiea (DBulichia) 2:23.75 5 710 arctica (Gitanopsis) . . . .. -.- 155 arcticus (Gammarus). . : 2... 476 arcticus (Lembos). . . . »... 595 arctieus (Menigrates) . - »... . 49 aretieus. (Mierodeutopus). . » . » - 595 arctieus (Örchomene) . . ..... 49 aretieus (Pontocrates) . . . : . . 240 arenaria (Amathilla). - ...... 387 arenaria (Bellie). . . 2... 0% 125 Aranaria (Krovea) 1. u... 241 arenaria (Kroyera) . ..... 241, 242 arenaria (Pterygocera).. . ... . 125 arenarius (Cancer (Gammarellus)). . 387 arenarius (Haustorius) . . .. . 125 arenarius (Oniscus) . » 2... 125, 387 arenarius (Pontocrates) . . . . . 241 arenarius (Sulcator) . . » » 2»... 125 arenatius (Oniseus) - » » » 2.2... 125 arenatius (Suleator) .. . » .».. 125 arenicola (Oediceros) . . . .. .. 239 arenicola (Oedicerus) . -» - .».. . 239 TEE FRE SE 276, 722 ATrgisBidae „u een 722 BTIBTERN 2 a a 28.308 4918 armata (Dybowskia). . . .». 2... 735 armata (Grimaldia) . . »... 163, 724 armata (Hyalella) 0,7. 505152 577 armata (Microcheles) -... ... . 214 armata (Pontoporeia) . » -»... - 126 armata (Priseilla) - . - . .. 2... 126 armata (Priscillina) . . .. .... 126 armata (Seba). . . . ...... 168,724 axrmate. (Beba) . HH, u 724 armata var. ongureni (Dybowskia) . 785 armatum (Öyrtophium). . 2.2... 697 armatum (Laetmatophilus) . . . . . 697 armatus (Acanthogammarus) 511,735 armatus (Allorchestes). . . . ...» 577 armatus (Öeradoceus). » 2.2... 5ll armatus (Gammarus) . .. 2.2... 5ll armatus (Laetmatophilus). . . . 697 armatus (Micerodeutopus) . . . . 589 armorica (Amphithoe) .. .... - 557 armoriea (Neobule) . . . . .... 557 ET EEE TEN 248, 726 articulata .(Leucothoe). . » .. . . 165 articulosa. (Leucothoe) . . » . . 165, 167 artieulosus (Astacus). . » » 2... 165 artieulosus (Cancer) „ . » 2... 0.16 artieulosus (Gammarus) » . ... . 165 BETEN asper, (Acanthonotosoma) . . .» . . 375 Aspera (MBeT3) - 2... 43a 440 aspera (Megamoera). . .» 2...» . 440 asper (Elasmopus). . . 2.2.2... 440 asper (Gammarus). . » » . » . 375,440 Aspidophüraia.i. m. 0 a 581 Aspidopleurus. - . . . „=... 89, 90 assimilis (Ampelisca) - ». » . .. ..107 assimilis (Atyloides). . .. 2... 363 assimilis (Cheirocratus) . . . . . 419 assimilis (Gammarus). . » . ... . 419 assimilis (Ischyrocerus) . . . - . 659 assimilis (Neopleustes) . . - . . 314 assimilis (Paramphithoe) . . . . » - 314 assimilis (Podocerus) . .. 2... 659 assimilis (Talitrus). . 2.2... 524 RE Sn ae TE 278 atchensis (Carinogammarus) . . 505 atchensis (Gammarus) . . .:... 505 atlantica (Acanthozone) . » .».. 302 atlantica (Ambasia) . . .. . 719, 721 atlantica (Gammaropsis) . » x... 6ll atlantica (Lysianassa) . » .» .. . 87,719 “atlantiea (Protomedeia) .... . . 611 atlantica. (Stenopleura) . . .. . 302 atlanticus (Eurystheus) . . . . - 611 atlantieus (Gammarus). . » 2... 719 atolli (Polycheria). . . .»..... 735 WEG AO N ne Ar 327 m get 3 TE ER RR | 827 AESTERER 255 re 827 Atyiiden.:. 20m Aids er ee AUyIOBBIB=Er NE NER 299, 727 Aviops 3. ee Atylas 7.2 Bart er VE ie a I nn Atylus aucklandiae (Orchestia) Audouinia audouiniana (Aristias) audouiniana (Lysianassa) audouiniana (Perrierella) . ... 41 audouinianus (Aristias) . » .»... 50 audouinianus (Lysianax). .. .. . 41 audouinianus (Pararistias) . . . . . 41 ee ee 737 auratus (Stegocephaloides) 92 auratus (Stegocephalus) . .. .. . 92 aurita (Gmelinopsis) . .. .. . 415 australiensis (Amphithoe) . .. . . 641 australiensis (Ampithoe) R . 641 australiensis (Lysianassa). . . . 87 australis (Allorchestes). . . .. . . 581 australis (Amathillopsis) 385 australis (Ampelisca) . .. ... 104 australis (Atyloides). . . ..:.. . 363 australis (Atylus) - . -.2.... 363 australis (Autonoe) . ....... 601 australis (Chiltonia). .. .... 735 australiis (Gammarus). . . . .. 733 australis (Hyalella) .. ...... 735 australis (Hyperiopsis) . . . . . 741 Wustralıa tleilins) » 2: 2,05 % 707 australis (Lemboides) . . . . . . 601 Beate CMelltay v5... 52 =2..4-% 423 australis (Mierodeuteropus). . . . . 601 australis (Mierodeutopus) . . . . . 601 australis (Paramoera) . ...... 363 australis-{Pherusa) .:... .» ,..0%..., 297 australis (Podocerus) . ». » 2... 654 austrina (Paramoera) . . .... 363 sustrinus (Atylus).. 2°. . ...0..% 363 Aulonoe.. . . - , 587,588, 594, 610, 623 aviculae (Chevalia) . . . 737 avirostris (Rhachotropis). . -» . . . 349 avirostris (Tritropis). - » .» ». ... 349 Azelboeckia... , . „un 391, 731 axeli (Pardaliscella). ...... 228 azteca (Amphithoe) . . ... .». 575 Bzteca (Hyalella) 4. ,=% 575 aztecus (Amphitoe) -. . . 2. .».. 575 babieus (Allorchestes). .-. . 2... 572 babirussa (Allorchestes) . . . . . . 572 babirussa (Amphithoe) . . .... 572 babirussa (Hyale). . . ...... 572 BAtOmE is en, 730, 731 baeri (Cardiophilus). ...... 395 baikalensis (Cancer)... ..... 376. baikali (Pallasea) ...... 378, 730 Baikalogammarus. . . ..... 416 »eird: (UF01606) 432: 2.2. 132 bairdi (Neopleustes) . ..... 314 bairdi (Paramphithoe) ... .... 3lt VE N a we) Luca Ark Fler Saar “0000. RER ae er ln ae ae Be MER) Alphabetical Index page . 328, 728 535 Pe Pe‘ se Sue. er 0 747 > page balkirii (Acanthogammarus). . . 734 balkirii (Polyacanthus). .. ... . 734 barbatipes (Anonyx). . ..»... 68 barbatipes (Tryphosa) . . ... . . 68 barbatipes (Tryphosella) 68 barbimana (Haplocheira) : . . . 609 barbimanum (Corophium) . . . . . 609 “barbimanus (Gammarus). . ... . 609 barbimanus (Haplocheira) . . . . . 609 barbimanus (Leptocheirus). . . . . 609 Bereniis: Saat 238 barentsi (Paronesimus) . . . .. 43 barilloni (Gammarus) . . . :... 481 barretti (Apherusa) . . . ...». 308 parretti {Pheräsa) , „. .. 1... 308 barthelemyi (Callisoma) . . ... - 62 bassi (Phoxocephalus) . . . . . 135 Basti: [Phozub) 4: 2.82, 135 Baten: so... nase, 355, 729 Dabei LAteins) . 1 292 Bateldan. - . vasea ,5 00% 355 batei (Halirages) . : -..... 292 baisı (Masra): Sinn sus 436 hateı (Moser). „unse tar 436 batei (Orchomene) ....... 45 batei (Phoxocephalus) . . . . .. » 146 Dar EBEN. 2 2, 5% 146, 147 batei (Podoceropsis) . » ».... 621 Datei. {Acnoclea) - „u 2 22. 2% 621 bathycephala (Amaryllis) . ... 2% bathycephalus (Amaryllis) . . .. . 24 Bathymedon::. rs. 255 BRENFONFE. 6.6: ann 729 bathyplous (Camacho) . .... 665 Batbyyores, 2... ee 119 DBathyDoreia ea ar er 119 beaucoudraii (Orchestia) 542 beaucoudraü (Talitrus) . . ..:. 542 behringanus (Acanthostepheia) . . . 726 behringiensis (Acanthostepheia) 254, 726 behringiensis (Oedicerus) . .. . . 254 ni, BEN en 124 bellianus (Tetromatus). . ». .. .- 100 berilloni (Echinogammarus) . . . 481 berilloni (Gammarus) . . .. . - 481 Dlancoune ae 646 bicaudata (Cymothoa) . .... . .- 686 bieaudatum (Corophium). ... . - 686 bieaudatus (Oniseus) . .». .....- 686 bieuspis (Acanthozone) . .... . 320 bieuspis (Amphithoe) . . . . - 313, 642 bieuspis (Amphithopsis) . . . 313 bieuspis (Neopleustes) . .. . - 313 bieuspis (Paramphithoe) . . . .. - 3l3 bieuspis (Pherusa) 304 bieuspis. (Pleustes) .... . 00.7. 313 748 Alphabetical Index page page bieuspis (Syrrho@). . »» .....: 276 | bonnieri (Talitroides) . . . . - - 527 bidens (Cerapus) . : 2.2... 741 | borawkii var. diehrou (Gammarus) . 738 bidens (Eriethonius). : . . . ..» - 671 | borealis. (Apherusa) . . . »...5. 304 bidens: (Kusirus). . 3:72:74 2.208 341 | borealis (Ceradoeus). : » . .: =»: 336 bidentatum (Corophium). : . : . »- 689 | borealis (Halirages) . . :» :.:.. 304 bidentatus (Hippomedon) . . : . 719 | borealis (Kerguelenia) . . . . . 12 bidentatus (Mierodeuteropus) . . . . 599 | borealis (Melphidippa) . . : . . 336 bidenticulata (Lysianassa) : . . : : 56 | borealis (Metopa). :» » » 2... 178 bidentieulatus (Anonyx) . ......: 56 | borealis (Metopa) . : : .. !. . 180 bidentieulatus (Ichnopus) . . . » : 56 borealis (Monoculodes) . . .. . 262 bidenticulatus (Socarnes) -. . - . 56 | borealis (Oediceros). . -» » . . . 244 bifasciatus (Gammarus) . .: ..» - 496 | boreus (Gammarus) . » 2.2... 476 bifasceiatus (Heterogammarus) . . 496 | borodini (Niphargoides).. . : . . 453 bifureus (Crangonyx) : . . : 373,730 | borowskii (Ceradoeus) . : » .» 2... 48 bifureus (Niphargus) . . : : .. - 730 | borowskii (Gammarus). : . 2»... - 498 Bircanna ans Er 205 | borowskii (Parapallasea) . . 498,733 biscayensis (Eusirus) . . : : . - 8342 | borowskii (Pleuracanthus) . . . . » 733 bispinimanus (Eurystheus) . . . . . 618 | borowskii subvar. abyssalis (Gammarus) 498 bispinosa (Acanthozone). . - .. » 305 | borowskii var. abyssalis (Pleuracanthus) 733 bispinosa (Amphilochus). . .. . . 154 | borowskii var. dichraas (Pleuracanthus) 733 bispinosa (Apherusa) . ..... 305 , borowskii var. dichrous (Gammarus) 498,733 bispinosa (Dexamine) . ..... - B06 |: Bernie: . . ia wre 367 bispinosa (Gitanopsis). . - : - - 15:1 Bela 2 789 bispinosa (Liljeborgia) . - -. - . 234 | bosphorana (Stenothoe) . . . . - 198. bispinosa (Lysianassa) . . ... 38 | bottae (Orchestia). . : . 2... 534 bispinosa (Pherusa) . . . ::... 805 | bottae (Orchestia): . : u. 3... 542 bispinosus (Amphilochus) . » . . . 154 | bottae var. feminaeformis (Orchestia) 534 bispinosus (Atylus), . : : 2» .... 306 | Böuvierella - . ae du. 727 bispinosus (Gammarus) . » :.». 234 | bouvieri (Pseudotiron) . : . . :» 284 bispinosus (Halirages) . . .: . . . 005 1 Bevallie. ; san. iR 357 bispinosus (Liljeborgia) . . -» -. . - 234 | bowersii (Crangonyx). ... . .- 729 bispinosus (Lysianax) . ». » 2... 38 | brachyceras (Ampelisca) . . . . 722 blanchardi (Moera) . ....... 435 | brachycereus (Anonyx) . „:... 48 blossevilliana (Dexamine). . . . 517 | Brachyuropus. . . ::...2.. 392 ee EEE EREN FPEE EINE 391,625 | branchialis (Gammarus) . .... . 497 boecki (Amphithoe). . ..».... 741 | branchialis (Heterogammarus). . 497 boecki (Andania) . . . .. 2... 85 |, Branchiößastta . . . . .-...“ 1 boeckii (Amphilochoideß) . :. : 152 | Bfandtia. . . ... 20.8 395 boeckii (Amphiloehus). . . . .. . 150 | brandtii (Ceradoceus). . : ...». 379 boeckii (Elasmopus) . -. : » . . 445 | brandtii (Dybowskia) . »..... 730 boecküi (Maera). .. ... . . 0. 445 | brandtii (Gammarus) . . . 2... 379 boeckii (Megamoera) . ... : .... 445 | brandtii (Pallasea) . :.: . 379,730 boeckii (Metopa) . . ...... 178 | branickii (Callisoma) . : »....- 62 boeckii (Neopleustes) . . . : . . 312 | branickii (Constantia) . » : »... 394 boeckii (Paramphithoe) . . . . . : 812 | branickii (Costantia). : » :.... 394 boeckii (Pardalisca) .. : : . . 228,228 | branickii (Maeroheetopus). -. . . 394 boeckii (Pardaliscella). . . . . . 228 | branickii var. alexandri (Constantia) 394 boeckii (Stegocephalus) . . . . . . 95 | brasiliense (Platophium) . . 698, 701, 703, boecki (Parandania). . : ....: 95 703, 704 bolivari (Podoprion). - - . . » : 18 | brasiliensis (Amphithoe) .. . . . » 637 bonelli (Gorophium). . » . . - 686, 691 | brasiliensis (Ampithoe) . : . - - 637 bonellii (Corophia) . » » 2... 691 | brasiliensis (Cerapus) . . ».».. 671 bonellii (Corophium) . . .. .. 691 | brasiliensis (Elasmopus): . : . - 443. bonellii (Corophium) : .. . . 691, 692 | brasiliensis (Eriethonius) . . 671,740 bonnellü (Corophium) . . ..»:.. 692 | brasiliensis (Gammarella). . ... . 443 Böhnierella .. . .. . . #4»: 2% 737 | brasiliensis (Gammarus) . » .» - . . 443 bonnieri (Socarnella) . ..... 719 | brasiliensis (Lysianassa) . .- . 87 ee ER ER AEVHT IERENER a, . ATS ERR FI SERIE ; x De a Alphabetical Index page brasiliensis (Moera) . . - »... . 443 brasiliensis (Orchestia (Talitrus)) . . 529 brasiliensis (Orchestoidea) 529 brasiliensis (Podocerus). -. . . - 704 brasiliensis (Pyetilus) . . . .».. » 671 brazieri (Colomastix) . .. .. . 206 breviatus (Sceopelocheirus) . . . - - 62 brevicalcar (Halimedon) . . 249, 250, 252 brevicalear (Oediceros) . . . » . . 249 brevicalcar (Westwoodilla) . 249 brevicarpa (Kroyera) . ...... 242 brevicarpum (Synchelidium) . . . . 242 'brevicaudata (Gammarella). . . . . 449 brevicaudata (Maera) . . ..... 444 brevicaudata (Megamoera) . . . . . 414 brevicaudata (Photis) . . . . . - 606 brevicaudatus (Gammarus) . . . 444,449 brevicaudatus (Onisimus) . . . . 27 brevicaudatus (Onisimus). . . .. - 28 brevicaudus (Gammarus). . ... - 449 brevicornis (Allorchestes) . . . . 584 brevieornis (Amaryllis) ...... 24 brevicornis (Ampelisca) . . . . . 100 brevieornis (Ampelisca) . . . . 101,103 brevicornis (Araneops). :. .» . . .» 100 brevicornis (Cheirocratus) . . . . - 418 brevicornis (Gammarus) . . -» . . - 231 brevicornis (Ischyrocerus). . . 661 brevicornis (Liljeborgia) . . . . 281 brevicornis (Neopleustes). . . . 313 brevicornis (Nicea perieri var.). . . 570 brevicornis (Dediceropsis). . . . 253 brevieornis (Oediceros) . » ... - 253 #brevicornis (Orchestia). . . » .. . 547 brevieornis (Paramphithoö). . . . . 313 brevieornis (Podocerus) . . . . » . 661 brevieornis (Polycheria) . . ... » 520 brevicornis (Stenothoe) . . .. . 199 brevicornis (Talitrus) . . ..... 547 brevicornis (Urothoe) . . . ... 131 "brevidigitata (Leucothoe) . . . . 167 brevidigitata (Orchestia) ... .. . 532 brevipes (Amphithoe) ....... 637 'brevipes (Ampithoe) . ..... 637 »Szevipes (Hyale) .. . . . .., 1735 brevirostris (Cyproidia) -. . -» - - . 160 'brevirostris (Peltocoxa) . . . 160, 723 brevirostris (Stegoplax) . » ... »- 723 brevitarsis (Amphithoe) . . .. . 817 ‚brevitarsis (Dexamine). ..... . 517 brito (Orchestoidea). ...... . 735 'brito (Talorchestia) . .. . . 552, 735 cc kAnonyz). : . ii. 86 ET 439 "brunneus (Amphilochus) . . 151,723 ‘brusinae (Amphithoe) „...... 641 ‘brusinae (Ampithoe) . ..... 641 749 page a 274 BERSDHRBR : va ee 739 Dauzelii (Anony8) . :..7..,0... 2% 74 Beam (Bars) 2:0 741 bruzelii (Metopa) . . . 174,178, 188, 189 bruzelii (Montagua) . . ...... 188 bruzelii (Proboloides) . . .. . . 188 buechichi (Hyale). . .. . 572 Buechichi {Nieea) . 17. ,2, 72, , 572 buchholzi (Acanthozone). . . . . . 324 buchholzi (Paramphithoe) . . . . 324 wubls Sn en ı1l cabanisii (Acanthogammarus) 509, 734 cabanisii (Ctenacanthus) . . . . . . 7 eabanisii (Gammarus) . ...... 509 caecula (Westwoodia) . . .... . 250 caecula (Westwoodilla) . . . . . 250 eaeculus (Hoplonyx). ....... 76 caeculus (Tmetonyx) . ..... 76 eaeculus (Westwoodea) . . .. . . 250 Gaacus (Andayz) . 5.8.2 2% 66 eaerulea (Amphithopsis) . . . . - - 295 eserulea (Pheruss) . ....... 295 ceaeruleus (Paraleptamphopus). . 295 eaesaris (Eusiroides). . - 345, 346, 3416 calamicola (Cerapus) 669, 740 ealamicola (Cyrtophium) . . .. . . 669 eslcarata (Metope): :. . ... „.. 189 ealcaratum (Probolium) . .... . 189 ealcaratus (Anonyx). -. » 2...» 65 ealcaratus (Centromedon) . . . . 65 calcaratus (Gammarus). . . 457,457, 487, 489, 491, 492, 493, 493 ealcaratus (Ischyrocerus (Podocerus)) 654 ealcaratus (Odontogammarus) . . 457 ealcaratus (Podocerus). . . .. . - 654 ealcaratus (Proboloides). . . . . 189 ealceolatus (Ichnopus). . - .». . - 52 ealiforniana (Megalorchestia) . . . . 528 ealiforniana (Orchestoidea) . . . 528 ealifornianus (Megalorchestes) 528 californiea (Jassa). . . . .. .. 656 ealifornieus (Podocerus) . . . .. - 656 ealiforniensis (Orchestia). . . . - - 741 0 A 149 N 295 Galliopiidae ....... 285, 727 en We 295 ne 37,61 BEMBORO 7:7, ee nen 664 eambriensis (Lembos) . - . » .. . 591 campbelliea (Allorchestes) . . . . - 562 eampbellica (Hyale). . . .... 562 camphylops (Gammarus). . .». .: . . 476 camptolops (Gammarus) . . .. . . 476 eamptonyx (Hyale) . . . . . 570,736 camptonyx (Nicea) Frl rn a Year MEET Sa ee ir a „2 750 Alphabetical Index 2089 page eampylops (Gammarus) 473,476 | carinatus (Gammarus) . .. . - 328, 387 camylops (Gammarus) ..... 476 | earinatus (Monoculodes) . . . . 261 eancella (Amphithoe) . ...... 376 | carinatus (Monoeulodes) . . . .. . 263 eancelloides (Dybowskia) . . .» . . 730 | carinatus (Odius) -. ».... 2... .... 211 cancelloides (Gammarus). . . . 377,380 | earinatus (Onesimoides). . . . - 32 cancelloides (Pallasea) 380,780 | carinater (Otum).. "2, , 2 5 211 IR): 22.0 0 a Ba en 377 eancellus (Amphithoe). .. ... 376 eancellus (Cancer (Gammarellus)) . . 376 eancellus (Cancer (Gammarus)). . : 376 eancellus (Dybowskia). . . ... 730 eancellus (Gammarus) . . . . - ee Ye eancellus (Öniscus) . : ...... 376 cancellus (Pallasea) . . . - - 376, 730 cancellus (Pallasea) 377, 377,378, 380, 509 eancellus var. gerstfeldtii (Dybowskia) 730 cancellus var. gerstfeldtii (Gammarus) 377 N BE NEAR FOT 460 canus (Gammarus viridis var.) . . . 484 eapellus (Gammarus) . ». ..... 495 capellus (Heterogammarus) . . . 495 ehpensis (Alylus) : ©... 361 eapensis (Iphimedia) . . .. . 361 capensis (Orchestia) . ..... 537 eapensis (Pontogeneia) . . . . . 361 capillata (Janassa) ;. 4... 2.5 649 eapillale (insel. 2. 649 capillatus (Podocerus) .. ..»... 649 ceapreolus (Echinogammarus) . . 488 capreolus (Gammarus). . ..... 488 eapreolus var. chloris (Gammarus) . 488 CAraInIca BYDNOPIN) . : . ....% 273 carcinophila (Bouvierella). . . . 727 earecinophila (Paramphithoe) . . . . 287 earceinophilus (Laothoes) 287,727 KERGBRIO. 2 ee ee 125 ERFRBIER 2 er 125 GardiopBllus: „.,.3:..3427, 22% 395 earicus (Onisimus) . . ..... 27 Dandophilus 2: 3:01.20 395 carinata (Amathia) . . . . . . 887,388 earinata (Amathilla).. . ..... 388 carinata (Ampelisca). ...... . 109 carinata (Amphithoe) . ...... 328 carinata (Haploops). .-...... 117 earinata (Harpinia) .. ...... 144 Carinata IHyBlo) 2... 561 carinata (Iphimedia) . .:.... 212 carinata (Kröyera) . .....». 261 carinata (Metopa) . :. ...... 184 carinata (Metopella) . ..... 184 earinata (Paramphithoe). ... . . 828 carinatum (Lepidepeecreum) . . . . 80 carinatus (Allorchestes) .. . . . . 561 carinatus (Atylus).-4::..2%:.% 328 carinatus (Gammarellus) . . . . 388 earinatus (Westwoodea) . . .» .» - . 261 Carinogammarus . ..... 501, 734 carinospinosa (Amathia) . . . . 887,387 carneolus (Gammarus). . . ... . 456 carneolus (Ommatogammarus). . 456 Girolobaten. 2 4 2, Sr 252 carpenterii (Axelboeckia) . . 392, 731 earpenterii (Otenacanthus) . . . . » 731 earpenterii (Gammarus) . . .... 392 casparianus (Niphargus) . . . . 409 easpary (Gammarus). . . ..».. 409 casparyi (Niphargus) . : . .»... 731 caspary (Niphargus) . . . . 409,731 caspius (Carinogammarus) . . . 504 caspius (Gammaracanthus) . . .. 508 easpius (Gammarus). . ... . 459, 504 caspius (Niphargoides) . . . . . 450 esspius (Niphargms). 25... 1..2.0..% 450 vaspius (Onesimüs) . ....:. 42% 34 oaspins (Oniseus) - =. „irn. 504 easpius (Pseudalibrotus) . . . . 34 cataphracta (Parampbithoe) . . . . 310 cataphractus (Amphithonotus) . 310, 310 cataphractus (Pleustes) . . . . . 310 cataphractus (Rhachotropis) . . . . 810 cataphractus (Tritropis) . . . . . . 310 eatharinensis (Batea) . . .... 355 eattai (Stenothoe) . . . ».... 195 caudadentata (Noenia). .. ... 621 caudisetus (Gammarus) . .. . . 512 caudisetus (Hyperia). . ...... 512. cavimana (Orchestia) -. . . .... 534 cavimanus (Örchomene) . . .. . . 85. ET 554 Centromedon . .... . > 65, 720 ÜSradOBUBS: . 2400 ne 430 Deapodmn 2.4 665 ‚GerapopBi 13 Zi sw. 674 GOPBDUS. 2... 0 ann 665 ceratinus (Lysianax). . - ».... 39 challengeri (Cyphocaris) . ... 29 chalubinskii (Lada)... ..... 741 Duarbolin 2.30 wa eg 718 chauseica (Lysianassa) ..... 87 chauseieus (Alibrotus). . . ... . 87 Cheizmedon: . 22082533 66, 720 Cheiripnoflsa: : 235 2.2 4004. Chelroasa . - - . . wa 234 Chalrboratan in. 417 chelatus (Buonys); » ..4:....:..7218 chelatus (Lembos) Fl 20 TIOREEr SAB Au Dee ee 1 - % 2 E Alphabetical Index 751 i page page chelatus (Phoxocephalus) . . . . . 139 | einerea (Amphithoe). . ...... 634 chelieorne (Corophium) . . . . . 687 | einerea (Ampithoe) . . ..... 634 chelifera (Audulla) . ...... 737 | einghalensis (Lysianassa) . . . 39,718 chelifera (Stimpsonella) . . . . . - ' 589 | einghalensis (Lysianax) . . .. - 39, 718 ehelifera (Stimpsonia) - » .» - »- - 589 | einnamomeus (Carinogammarus) 502 ehelifer (Mierodeuteropus) . . . . » 591 | einnamomeus (Gammarus) . . . . - 502 chelifer (Microdeutopus) . . . . 589 | eireinnatus (Amphithoe) . . .... 512 chelifer (Mierodeutopus) . . . .» . » 591 | eireinnatus (Elasmopus) . . .». .» . 512 cheloniae (Platophium) .. .. . - 701 | eireinnatus (Gammarus). ... . 512 cheloniae (Podocerus). . . . . » 701 | eirrus (Apherusa). . . 2.2... 304 ehelonophilum (Cyrtophium) . . . . 703 | eirrus (Pherusa) .. . 2.2.2... 304 chelonophilum (Platophium) . 701,708, 741 | Cleippides . .:... 2... .. 300 ehelönophilus (Podocerus) . . . - - 701] Oleonarda: 3.2, 2 2 346 chelonophilus (Podocerus). . 703,741 | elevei (Apherusa) - .. ..... 727 FR ar Se a a ya 693 | eloquetii (Örchestia) . -» » » 2...» 526 BR tIaaer in 693 | eloquetiüTalitrus) . . . .» ... 526 Brut ne en 693 | eloquetüi (Thalitrus) . .».».... 526 Chevalia : :. ... .. rn 787.| eloquettü (Orchestis) +... .. ...% 526 chevreuxi (Ampelisca) . . . . - 722 | elypeata (Leucothoe) . . . .... 175 chevreuxi (Orchestia) . . . -. » . 533 | elypeata (Metopa). .... . 175, 724 chevreuxi (Orchomenopsis) . . . 721 | elypeata (Metopa). . ». .». 2.2... 177 Breakins na en 669 | elypeata (Metopina). ....... 724 ehilensis (Amphithoe) . . . ... . 641 | elypeata (Montagua) ..... 175, 724 ehilensis (Amphitoe) . .»..».... 641 | elypeata (Stenothoe) 195, 725 ehilensis (Ampithoe) . . . - . . 641 | elypeata (Stenothoe) . . .. .- 725 ehilensis (Aunonyx) . ....... 84 | elypeata (Sthenometopa) .... . 724 chilensis (Gammarus) . . . -. . . 5l2 | elypeatum (Lepidepecereum) . . 79, 720 chilensis (Orchestia) . . 531, 532, 536, 537, | elypeatus (Proboloides) . ... . . 725 539, 542, 552,552 | elypeatus (Stenothoe) . . . . . 195, 725 ehilensis (Talitrus) . . -.....: 527 | eoalita (&uernea) . ..... 521, 735 ehiliensis (Orchestia) . . . . . - 5387 | coalita (Guernea) . . » .» 2... 522 ehiliensis (Orchestia). . . . ... .» 552 | coalita (Helleria) . «x 2»... .. 521 loHias 2 555, 735 | eoelochir (Lysianassa) . . . - - 718 ehiltoni (Ampelisca). . . ... . 102 | eoelochir (Lysianax) . . .» :... 718 ehiltoni (Eurystheus) . . ... . 617 | eoheres (Valettia) - - - . ...» .- 22 ehiltoni (Gammaropsis) . ». » . . . 617 | eolletti (Siphonoecetes) . . . 683,740 ORakont (kryvaleyı. 2.12 2 2.258,2785:1: Golomastidae- .... ......2% 206 ehiltoni (Iphinotus) . . ». » » ... 204 | Colomastigidae . .... . . 206 ohiltoni (Maera).. . 2.2... ee 206 nn er Br PER 276 | ecolumbiae (Aoroides) . . .. . » 586 Chironesimus. . ».... 2... 72 | comes: (Atylus) ... -... 2. .% 741 Ohlorist 7:7 25 00 een e 883,383 | commensalis (Aristias) . .. . . 50 chloris (Gammarus capreolus var.) . 488 | commensalis (Ischyrocerus) . . 739 ICHOBIOON 4 Haan ana ee 287 | commensalis (Leucothoe) . . . . 166 christianiensis (Stegocephaloides) 92 | ecompaeta (Ampelisca), . . .. . 109 christianiensis (Stegocephalus) . . . 92 | compaeta (Kerguelenia). . . . - 12 eicada (Anonyx) . . . . 74,75,76,76,76 | compaeta (Metopa) . .- :.»... 186 cieada (Hoplonyz) : -. .,.... 74 | compaectus (Crangonyx) -. » .: : - » 369 cieada (Oniseus) . .. . . ‘ 74 | compactus (Metopoides). . . - . 186 cicada (PFmetonyx) . . »..... 74 | compactus (Niphargoides). . . . 451 eicadoides (AnonyX) . ».. 2... 75 | eompactus (Paracrangonyx).. . . 369 eicadoides (Tmetonyx) . . .. . 75 | compressa (Allorchestes). . . . . - 581 eiliata (Lysianassa) . -.. . »... 50 | compressa (Ampelisca) . . . . . 722 eiliata (Orchomenella) . ..... 81 | compressa (Amphithoe) . ... .. 330 eiliata (Tryphosa). . . . ». 2... 81 | compressa (Darwinia) . . 2. .... 208 einderella (Halimedon) . ....._ 269 | compressa (Parampbithoe) . . . . - 330 einderella (Oediceroides) . . . . 269 compressa (Tryphosa) 752 page compressa (Tryphosella) . .... . 71 eompressus (Allorchestes). . . . 581 eompressus (Atylus). . . -» .... 330 compressus (Darwinea). . .... 208 compressus (Gammarus) 465 eompta (Amphithoe) ....... 645 compta (Grubia) . : .. 2... 739 eomptus (Amphithoides) 645, 739 Bisnohalentee a urn en 663 eoneinna (Amphilochus) . .... » 150 eonfervicola. (Maera) . ...... 428 eonfervicola (Melita) . . .... 428 eonfervicolus (Gammarus) . ». . » . 428 eonfervicolus (Melita) . ». ..... 428 conformata (Sunamphitho&) 645 conformata (Sunamphitoe) . .» . » 645 eonformata (Synamphithoe) . . 645 eonformatus (Sunamphitoe). . . . - 645 eoniger (Epimeria) . »...... 322 eonsanguinea (Liljeborgia) 232 eonspicua (Epimeria) . ». »:... 322 eonspieua (Oediceroides). . .. . - 268 N N 394 eonstantinopolitanus (Ischyrocerus) . 653 eonstrieta (Orchestia) . . . .. » 542 constructa (Orchestia) . . .» . - 2 542 eontractum (Corophium) . . . . 692 coogeensis (Allorchestes crassicornis N N .- DB eookii (Talorchestia) . .... . 554 cookii (Thalorchestia) . .. ... . 554 cooki (Orchestia) . . . . - : 554 eorallina (Iphimedia) . ...... 212 - eorallinus. (Atylus) . .»....x» « 515 eorallinus (Gammarus fasciatus) . . 432 KIOEBRDHB a ee 736 eornigera (Epimeria) . . . . . 321,322 eornigera (Epimeria) . . .. . . 323 eorniger (Cancer (Gammarellus)) . . 823 eorniger (Cancer (Gammarus)) . . . 823 corniger (Gammarus) . x»... 8323 eornigerum (Acanthonotosoma) . 322, 322, , 823 ceornuaurei (Leptocheirus) . . . 626 eornutus (Megamphopus) . . . . 621 Doromarn Deren: . 662 eoroninii (Melita) -. .: ..... 424 Bnaröphis: 2. 2 ee Barayhiase N, . . 662 BRorophiidee: ..:.:..:.. . : . 668, 739 Brophiyn 2:2.) ,.8:437. 25 DB, 740 Corophrium . ..... A | corpulentus (Andaniotes) . . - . 8% eorpulentus (Anonyxz) . ». » 2» 2...8 eorpulentus (Niphargoides) . 451 costae (Atylus) . ra WR wei costae (yasni N R 38 Alphabetical Index page eostae (Lysianassa) -. . » 2... 40 N a 394 costata (Amphithoe). . ....». 741 costata (Gmelina). . .. . a a eatesi (Malta)... Guss a 423 eranchii (Vertumnus) . .» » 2»... 323 2 367 FBBDEONTX: 2 eek 370, 729 seasss (Pyproidig) 4. .4ngasniung a 157 erassicorne (Corophium) 690 erassicornis (Allorchestes) . . . . . 568 erassicornis (Amphithoe) .... . 644 erassicornis (Byblis) .. .... 114 erassicornis (Cerapus) . . . . . 666 erassicornis (Grubia) 636, 641, 641, 641, 642, 642, 643, 645, 645 erassicornis (Grubia) . . . . .. 644 erassicornis (Hyale).. ..... 568 erassicornis (Örchestia) -. .. ..» . 540 erassicornis (Siphonocetus) . . . . - 666 erassicornis (Siphonoecetes) ; 666 erassicornis (Stenothoe) . . . . 195, 195 erassicornis var. coogeensis (Allor- Bra)... ae 538 erassi (Eusiroides) . . . :... 346 erassimana (Leucothoe). . . . . 168 erassimana (Moera) . .. ..... 445 erassimanus (Oratippus) . . » .- »- 207 erassimanus (Elasmopus) . . . 445 crassimanus (Gammarus) . . . . 512 erassipes (Eurystheus) . . . . . 612 erassipes (Gammaropsis) . » - » - » 612 erassipes (Harmomia) . . . ... 383 erassipes (Harmonia) . » » »...» 383 erassipes (Moers): . , 4:4: ,..., . 612 erassipes (Nicea) . . . . . sär 561 erassipes (Parapherusa) . . . . . 383 erassipes (Perrierella) . -. .... . 41 erassipes (Protomedeia) . »..... 383 erassipes (Unciola) . . ... 2 erassirostris (Monoculodes) . . . 263 erassum (Tetradeion) . . . -.. . 157 ‘serassus (Gammarus) . . .... 467 a 206 N | erenata (Callisoma) . - » »-.... 62 erenatipalma Bose). ee 680 erenatipalma (Dryope). . ... » . 680 erenatipalmata (Dryope). . ... » 680 erenatipalmata (Metopa). . . .». . 188 erenatipalmata (Uneiola). .. .. . 680 erenatipalmatus (Cheirimedon) . . . 60 erenatipalmatus (Cheirimedon) . 67 erenatipalmatus (Proboloides) . . 188 erenatipalma (Unciola) ..... 680 erenatus (Scopelocheirus) . . . . 62 erenulata (Amphithoe) ...... E De Alphabetical Index © page erenulata (Harpina) . . . .... . 141 erenulata (Harpinia) . - . .. . 141 erenulata (Harpinia) . . ... . - 144 erenulata (Syrrhoe) . ... . . 282 erenulata (Syrrhoe) . . . . . Re erenulatum (Centromedon). . . . . 720 erenulatus (Atylus) ... . . . 359 erenulatus (Centromedon).. . . . 720 er a Re 191 N Be 190 erispata (Lysianassa) . ...... 46 erispata (Orchomene) . . . ».. 46 erispatus (Anonyx) .. .....». 46 erispatus (Örchomene). .. .». . . 46 eristata (Amathillina) . . . .. . 499 eristata (Amathillinella) . .... . 499 eristata (Amphithoe) . .»...... 219 eristata var. spinata (Amathillina) 501 eristatum (Acanthonotosoma). . . . 219 eristatum (Acanthonotozoma) . . 219 eristatum (Cyrtophium) » . . . .» . 706 eristatum (Platophium) . . .... 706 eristatus (Acanthonotus). . . : » » 219 eristatus (Podocerus) . . . . . . 706 eristatus (Vertumnus) . . .» ...» . 219 mstiea (Beiopis) 2.2... 27... 406 eroatieus (Gammarus) . -. . ... . 406 eroaticus (Niphargus). . . . . . 406 ©tenacanthus. ..... . 731, 734, 734 cubensis (Lysianassa). . . .. - 38 eubensis (Lysianax) . -. »..... 38 eueullata (Tryphosa) . ..... 720 eumbrensis (Microjassa). . . . . 651 eumbrensis (Podocerus) . . .» .. .» 651 eunieulus (Amphithoe). .. ... . 647 eunieulus (Bianeolina). . . . . . 647 euprea (Hyalella) . . ...... 578 eupreus (Allorchestes). . . .. . . 578 eurticauda (Dulichia) ...... . 715 eurvirostris (Oediceros) . . . . . . 246 eurvirostris (Paroediceros) 246 eurvispinum (Corophium) . . . . 690 euspidata (Acanthozone) 324, 325, 325, 326 cuspidata (Paramphithoe) . . 326 euspidata (Pardalisca). . . .. . 223 euspidata (Pardalisca) .. . . . 222, 224 euspidatus (Eusirus) . . .... 339 euspidatus (Eusirus). . . . 340, 341, 342 euspidatus (Oniseus). . ». ..... 326 euspidatus (Siphonoecetes) . 683, 740, 740 euspidatus var. antarctieus (Eusirus) 340 en NE ne 790 eyaneus (Echinogammarus) . . . 484 eyaneus (Gammarus) . . ..... 484 en a FREE ET 79 N TR RE RE PR: 30 eyelops (Ampelisca)... ..... . 722 753 page eylindrieum (Corophium) . . 692, 740 eylindrieus (Podocerus) . . 648, 658, 692 ee 5 631 eymba (Lysianassa) .. : .... 87 a TE a 685 Eh 28, 717 Re Re 157 eypris (Stenothoe). . . ..... 725 SEDTOIBER Tu ne, 157, 723 EN ee 157, 160 a TE 697 ezerskii (Echinogammarus) . . . 482 ezerskii (Gammarus). . . .» 2... 482 ezyrnianskii (Gammarus). . . . . - 874 ezyrniahskii (Hyalellopsis) 374 daleyi (Ampelisca) . . ..... 111 damnoniensis (Cyproidia) . ... . 160 damnoniensis (Lembos) . . . . . - "593 damnoniensis (Mierodeutopus) 593, 736 damnoniensis (Peltoeoxa) . . ... . 160 a Te ER a 707 danae (Leptothoe) 440 danae (Maera).'. 2... 700, 440 Gmme (Massa. 27. a 440 danae (Platophium) . . ... . FR danae (Podocerus) . . ..... 705 N ee BR Du ER danai (Allorchestes). . . . .... 566 a) A 360 danai (Pontogeneia). . -. . .. . 360 danai (Stenothoe). . . . :.»...- 198 RES. ar nee 360 danica (Chimaeropsis) . . .. .. - 277 danielsseni (Ambasia) . .. . . . 51, 719 danielssenii (Ambasia) . . . . . 5l danmonensis (Mierodeutopus). . . . 786 danmoniensis (Lembos) . . . . . - 593 danmoniensis (Mierodeutopus) 592 DERNIDER re 208 N RE RE 208 darwinii (Oyrtophium). . . .».... 703 darwimii (Orchestia). . . ...... 545 darwinii (Platophium) . .... . . 703 darwini (Talorchestia) . . . . . 545 Dautsenbergia= . . '. 2... 2. 728 debilis (Panoploea) . .. ..... 294 debruynü (Anonyx) . -. » ...». 172 debruynii (Chironesimus) . . . . 72 delaplata (Elasmopus). . . .. .- 444 delebeequei (Gammarus) 475 dellavallei (Eusiroides) . . . . - 346 dellavallei (Haploops) . . . 116, 722 dellavallei (Leptocheirus) . . . . 628 dellavallei (Liljeborgia) . . . . . 234 dellavallei (Lysianella) - . . .. 32 dellavallei (Siphonoecetes) demimutus (Gammarus) . . . . . Das Tierreich. 21. Lief.: T.R.R. Stebbing, Amphipoda I. 48 754 page demissus (Monoculodes). . . . - 267 dentalii (Concholestes) . . . . . 663 dentallii (Concholestes) . . .» . . - 663 dentata (Ampithoe) . ....... 575 dentata (Atylopsis) . . ..... 299 dentata (Dexiocerella) - . . .». .. . 706 dentata(Gammaropsis). . » » » . . 738 dentata (Hyalella). . ...:.. 575, 578 dentata (Megamoera) . . .».... - 427 deäatetea (Mellta) 3:5. 400 dentata (Melita) . ..:... 429, 487 dentata (Orchestia) -. -. ». . ... 537 dentatum (Corophium) . .... 692 dentatum (Cyrtophium) . .».... . 706 dentatus (Allorchestes) . . .. . - 575 dentatus (Atylopsis). - » :».. .- 299 dentatus (Eurystheus) . . .. . . 738 dentatus (Gammarus) . . .. . 427, 427 dentatus var. gracilicornis (Allorchestes) 578 dentatus var. inermis (Allorchestes) . 578 ASRLELWAHEH) 2.2, 653 dentex (Podocerus) » .». .: . . ... 653 dentieulata (Leueothoe) ..... . 165 dentieulatus (Anonyx). - ..... 59 dentieulatus (Hippomedon) . . . 59 dentieulatus (Hippomedon). . . . . 60 dentifera (Gammaropsis) . . . . . - 615 dentifera (Moers) . . .. . . x... 615 dentifera (Paranaenia). . .. . 615, 616 dentifer (Eurystheus) . . ... . 615 dentimanus (Cheirimedon). . . 720 depressa (Autonoe) ........ 622 depressa (Goösia). . . ..... 622 TOO ee een 604 ERDE 3 a a a 208 deshayesii (Orchestia) . . . . . 545, 545 deshayesii (Örchestoidea). . . . . . 735 deshayesii (Talorchestia) . . 545,735 desmarestii (Amphithoe) . . . . . . 639 Dasssbplilus 22... 2.2 vlt rein 208 devismesi (Bathyonyx) . ... - 729 in 11 ER IR 514 DORAmariUns,: nn 514 Doxsasmiuae. 4.2.0... 0,0% . 514 Doxsmiine age au 514, 735 Dezaminidae... .. ..... 514 Dexasshndl 2 2 210, 514 Dexiocerella ..... DER Tales 700 diadema (Ampelisca) . ..... 107 diadema (Ampelisca) . . 109, 109, 110, 110 diadema (Araneops). . ».».... 107 dichraas (Pleuracanthus borowskii var.) 733 dichrou (Gammarus borawkii var.) 733 dichrous (Gammarus borowskii var.) 498, 733 didacetyla (Calliope) -. -. ...... 741 diemenensis (Aspidophoreia) . . . . 581 diemenensis (Elasmopus) . . . . r Alphabetical Index page diemenensis (Leucothoe). . . . . 168 diemenensis(Megamoera). . .» .. . 442 diemenensis (Örchestia) . .»..... 548 diemenensis (Talorchestia) 548 difformis (Cerapus) . . ».2.... 672 difformis (Erichthonius) 671, 672, 672, 672, 673, 673, 674, 674, 715 difformis (Eriehtonius). . » » . . .» 672 difformis (Eriethonius) . . . . . 671,673 difformis (Eriethonius) . . . . . 672 Dikerogammarus . . ...... 458 dilatata (Orchomenella) . . . . .- 720 dilatatus (Gammarus pachytus var.) . 404 ET EN EN EIN FINEN 791 diplodactyla (Hyale). . ..... 562 diplodaetylus (Hyale) . . . . . . . 562 dispar (Orehöstis) . Kiss 532 distinguendus (Aceros). ». » .»» . » 255 distinguendus (Halimedon). . . - . 255 diversimanus (Maera) . ...... 741 doliehocarpus (Eusirogenes) . . . 728 dolichonyx (Dexamine) ...... 518 dolichonyx (Tritaeta) ...... . 518 dollfusi (Stenothoe) . . . . . 196, 725 donatol (Maets) 7. a: ts. Ten 435 drechselii (Cheiroeratus) . . . . - » 420 drepanocheir (Acanthonotosoma) . . 298 drepanocheir (Harpinioides) . . . 298 DOBE ER EAN ne 676 Diyspolder, Ze wn tay 601 Diyabe: 2 3. 3 Beni "078 Dryopöldes' 2 ak en 601 dryshenskii (Dybowskia). .». . .. » 730 dryshenski (Pallasea). .. .. .- 730 duabeni (Gammarus). . »... » "2.2408 dubia (Ampelisca). . . »..... 100 dubia (Amphithoe) . ....... 643 dubia (Amphitopsis). . » ».... 741 Auy3a (OPABBRA}:; 2.0: Eu 191 dubıa (Oressa) 2.2.2.0. 12:25 0 192, 192 dubia (Dansis) u u. a, ae 191 dubia (Liljeborgia) . .» - . » 233 dubla-(@Maera): 2. re 1732 dubia (Sunamphithoe). . ». »..». 643 dubius (Anisopus). ». . . . - 0 dubius (Elasmopus). . ..... 732 dobius (Eusirus) . „ae ste nsar 233 dubius (Gammäarus). . ..... 512 dubius (Montagua). . ». . 2... 191 dubius (Pleonexes) . ». .... . 643 duebeni (Gammarus). . . »»... . 473 duebenii (Gammarus) . . . . 478,733 duebenii var. wilkitskii (Gammarus) . 733 dugesii (Gammarus). . ...... 425 Dustohla ea. Se a ea 708 Dolichidaer..=.:, 0. 2203 Kara 694 Dalichifkr,.,2 u... SE 694 : Be 3 4 t . , Alphabetical Index 755 page page Dalschiidse 2.372 Hr. N 741 Dybawskıe 2 4.04 9.0 780,786 | Ephipphors . „2... EN dybowskii (Hyale). »........ 579 | ephippiatus(Gammarusaraneolusvar.) 479 dybowskii (Hyale (Allorchestes)) . . 579 | Ephippiphora . . » 2... 2.2... 56 dybowskii (Hyalella) . ..... Es 7 329 dybowskii (Pallasea) .. .. . . 978:1 MDImBBle: a ek 321, 728 Dyopedidae ..... an, era nimermae: ae 320 DR ar EN EEE wei Beimerimaeıy su... 2% 320 dytiseus (Lepidactylis) . - ».. . TE 792 eblanae (Iphimedia) . ». »...... DIR Bnchkonien 22 0. 0 en 670 eblanae (Iphimediopsis) . -» . . 212,741 | Erichtonius . . ...:...... 670 eblanae (Panoploea). . . . ... 213 7 Wmiethonius u 0, 670, 740 Echinogammarus . . »..... rn. ee 2 A ee PER 411 echinus (Allorchestes) . . . » .. . BIO. BPIODRRE On 5 niet 411,732 echinus (Hyalella). ....... Re re TR 4ll Barlophtihelme, a: 2... l | ermannii (Crangonyx). . . . - - 373 edvardsi (Amphithoe) . . ... . . 348 | ermannii (Gammarus) . . »...- 373 edvardsii (Talitrus) . ». . .» .... 848 | erosa (Tryphosa) .. -. .». »..... 741 edwardsi (Anonyx) . » » 2... 45 | erythraea (Amphithoe) ..... - 639 edwardsii (Amphithoe) . . .... 848 | erythraea (Moera). .. .».....- 446 edwardsii (Amphithonotus) . . . . . 348 | erythraeus (Elasmopus) . . . . - 446 edwardsii (Amphitonotus) . . . . . 349 | erythrophthalma (Autonoe) . . . . 618 edwardsii (Anonyx) . . . . 25,27,28,45 | erythrophthalma (Eurystheus). . . . 618 edwardsii (Onesimus) . » 2.2... 25 | erythrophthalma (Gammaropsis) . . 618 edwardsii (Onisimus) . . ... - 25 | erythrophthalma (Maera). .. ..» . 618 edwardsi (Monoculodes). . . . - 727 | erythrophthalmus (Gammaropsis) . . 618 NE A a RE EL RR RE 128 | erythrophthalmus (Gammarus (Gam- egregia (Ceina) . . ».. 2»... 554 Je er 618 Ouresie (Nivea). EB 554 | erythrophthalmus (Phoxocepha- N ae EN Pe 606 A EN 136 BMlasmopus :. ns 441,782 | erythrophthalmus (Phosus). . . - - 136 elegans (Amphithopsis). . . -» .» . » 306 | erythrophthalmus (Socarnes) . . 57 elegans (Anonyx) . ....... 86 | erythrops (Byblis) ....... 112 elegans (Halirages) . -. ..... . 292 | eschriehti (Ampelisca) . . . 100,117, 721 elegans (Niphargus). .... . . 409 | eschrichtii (Ampelisca). . 100, 721, 722 elegans (Paramphithoe) . .... . 806 | eschriehtii (Ampelisca) ... ... 101 elegans (Pherusa) .. . . ...... 806 | eschrichtii (Opis) - . - - +...» 20 elegans (Rachotropis) . » . .» ». .» 350 | eschriehtii(Opisa). - - » -- . - 20 elegans (Rhachotropis) . . . . - 850 | eschrichti (Opisa). . » »».. IE. elegans (Urothoe) . . ...... 131 | esmarkii (Metopa). ». . ..».. 173 elegans var. imperfeetus (Niphargus) 409 | esmarki (Metopa) .. . -...- .» 173 elliptious (leilius). . 2.2.2.2... 707 | euacantha (Paramphithoe) . . . . - 312 elongata (Amphithoe) . ..... . 644 | euacanthus (Pleustes) . .... - - 812 elongata (Eriopis). - » -» ».... #47 7 Boandanls’...2.....0.. ie. 97 elongata (Eriopisa) . ...... 411 | euchore (Orchestia) . . » ».... 532 elongata (Eriopsis) . . » .... . 411 | Euerangonyx . . ... . . . 388, 730 elongatus (Gammarus). . . 2... a a 19 elongatus (Niphargus) . . . . 2... 411 | europaeus (Gammarus kesslerii var.) . 377 elongatus (Niphargus plateaui) . . . 731 | europeus (Dybowskia kesslerii var.) .. 730 emarginata (Atylopsis) . . . . . BI Bey mer Nenn ee 356 emarginatum (Acanthonotosoma) . . 800 | euryonyx (Leucothoe).. . . - » - 724 emarginatus (Atylopsis) . . . ... BET Ineyporea. . .» ee 72 emissitius (Dereothoe) . . . . . 605,674 | Burystheus. . ....... 610, 738 emissitius (Dereotho& (Cerapus)) . . 605 | Eurytenes . ... 22:22... 72 emissitius (Gammarus). . . . . -..605 | Eurythenes .. .. . 2... ... 12 emissitius(Mieroprotopus). . . . 6058 | Eurytheus . . ...: 2.2... 610 emistuis (Dereothoe) . .... . OR: Dumnus =. 2 at 338 756 page Bueiridsas. u. 2.2.0... 338, 728 MUMLORENEB 5 re Be 728 BuBioidaan ee 3415, 729 WEHTOBBIB NE Es 343 en ER 338, 729 excavata (Harpinia). . . . . 142, 723 excavata (Naeniä). - . 2». ..5... 620 excavata (Noeniae). . .. 2.2... 620 excavata(Orchestia). . . . ... 735 excavata (Örchomenopsis) . . . . . 721 excavata (Podoceropsis) . . .. » - 621 excavatum (Corophium) . . .». .» 664 excavatum (Paracorophium) 664 excavatus (Örchomene) . ..... 85 exigua (Paramphithoe). .. ... . 318 EIzuus KANOnyEH.. u 86 exiguus (Anonyx). ... +... 0,.% 87 exiguus (Hoplonyx) . . »..... 720 exiguus (Tmetonyx) .-.... 720 REN (Mole) 7.2, Senann e 423 Bxoediceroß : „in. 4m nn. 239 exsertipes (Eurystheus). . .. - 614 exsertipes (Gammaropsis) . » » » - 614 exsertipes (Protomedeia) . . . . - 614 N 206 falcata (Bruzeliella)........ 739 faleata CDulichisy: ns. 2275. 712 Faleata Fassa). ie 656 faleatiformis (Jassa) . .» .....653 faleatiformis (Podocerus). . . : . » 653 falcatus (Astacus). ». . ». 2. c.». 656 falcatus (Atylus) ... =.“ wm. 3530 falcatus (Cancer (Gammarus)) 656 faleatus (Dyopedos). -». ».»..». 712 Tlonten KIREB) in mis ai 656 faleatus (Leptophoxus) . ... . 136 faleatus (Monoeulodes) . .... - 266 faleatus (Nototropis) . - -» - » . 8330 falcatus (Paratylus) . . .. » . 330 falcatus (Phoxocephalus). .. . . » 136 faleatus (Phoxzus) . . . . ».... 136 faleatus (Podocerus) 585, 649, 651, 653, 654, 655, 656, 657, 658, 662 falklandi (Amphithoe) . .. .... 637 faroensis (Oyelocaris) . -. ..... 717 fasciata (Brandtia) . .....».. 398 fasciata (Protomedeia) . . :.. » 623 » fasciata (Protomedeia). .. .».. 628 fasciata (Xenocheira) -. . ... .. 624 faseiatus (Ceradocus) . 481, 432,442, 612 faseiatus (Cerapus) . x»... 2... 674 fasciatus corallinus (Gammarus) 432 fasciatus (Dikerogammarus) . . . 460 fasciatus (Eriethonius) . ... . 674 fasciatus (Gammarus) . . . 482,513, 460 fasciatus violaceus (Gammarus) . . . 482 fasciculata (Hyale) . .... . .... 565 Alphabetical Index page faseiculata (Maera) . » 2.2.2... 74 fasciculata (Megamaera) .. ... . 741 fascieulata (Nicea) - ....... 565 fasceigera (Parhyale) ...... 556 faseciger (Parhyale) .. . 2...» 556 feminaeformis (Orchestia bottae var.) 534 femorata (Amphithoe). . . - . "2 = ‚636 femorata (Ampithoe) . ..... 636 femorata (Pontoporeia) . .... 128 femorata (Pontoporeia) . .....» 128 femoratus (Anonyx) ...... 86 ferox (Pleonexes) . . ...... 738 festäva (Moera) . .- sm ae 43] filieornis (Amphithoe) . . . -»...» 641 filieornis (Ampithoe) . ..... 641 flieornis (Anonyxk) . » +» sr. 87 filieornis (Lysianassa) . ». » .».. 39 filieornis (Lysianassina) - -» .... 39 filieornis (Pontiporeia) 128 filigera (Amphithoe). . ». » .»... 641 filigera (Ampithoe) - . . .... 641 BHSET CARORIEY 4 a 86 filosa (Amphithoe) . :» »:...x. 641 Btosa (Ampithoe) wi. m: 0% 641 Mosa (Uymadusa) : =: 4.4... ..8 % 641 fimbriata (Hyale) . x . s ..5...5% 564 Ruabriate (Nices) 2... 2, a. 564 fimbriata (Protomedeia) . .. . . - 627 fimbriatus (Gammarus) . »....» 627 fimbriatus (Syrrhoe). . .. . .». 280 fimbriatus (Syrrhoites) . . . . - 280 fingalli (Calliope). ». » » 2.2... 317 fingalli (Calliopius) . -» » +...» 317 fiseherii (Orchestia).. . »..»..» . 528 fischerii (Orchestoidea) . . . -. 528 fisheri (Lysianassa). . . 87, 721 fisheri (Lysianassa) -. . .. 2... 719 fissicauda (Amphithoe) . . .» . . 361 fissicauds (Atylus) » =... u. 861 fissieauda (Iphimedia) . ...... 861 fissieauda (Pontogeneia) 361 fissiecornis (Gammarus) . .».... 231 fissicornis (Iduna) . .. 22... ..281 fissiecornis (Liljeborgia) . - . - - 231 fissicornis (Lilljeborgia) . » » . » » 232 fissispinosa (Orchestia) . ».... 526 fissispinosus (Talitrus) . . .. . 526 fixsanii (Akylus) ., » a»... 00% 402 fixsenii (Gammarus). » »..... 402 fixsenii (Mieruropus) . . . .. . 402 flabellifer (Gammarus) . .. .. 513 flagellatus (Crangonyx) . . . 371,730 flagelliformis (Spinifer) . ». .... 134 flavus (Acanthogammarus) 734 flavus (Gammarus) . » 2.2.2... 455 flavus (Ommatogammarus) . . . 455 flavus (Polyacanthus) . . .»....:. 734 ee er A THF : re a Alphabetical Index page flindersi (Amphithoe) . .. .... 635 flindersi (Ampithoe) . . .... 635 flindersi (Cerapus) . ... . 668, 740 flindersi (Dexamine). . ». ... . 522 fSlindersi (Guernea) . . .».... 522 flindersi (Leueothoe) . . . .». . - 167 floresiana (Orchestia) . . . . - - 539 ee 496 flori (Heterogammarus) . . . » . 496 florii (Gammarus). - ....... 496 flori var. albula (Gammarus) . . . . 496 fluvialis (Lockingtonia) . . . . . . 575 Aluviatilis (Calliope) . . ». »:. 297 fluviatilis (Calliopius) . » ... » » 297 fluviatilis (Carinogamımarus) . . . . 506 fluviatilis (Gammarus) 410, 454, 455, 455, 456; 456, 469, 474, 475, 475, 477, 478, 479, 482, 484, 485, 485, 486, 486, 487, 488, 488, 489, 490, 490, 491, 492, 494, 495, 496, 496, 497, 502, 503, 503, 504, 504, 506, 506 fluviatilis (Paracalliope) z 297 fluviatilis var. manophtalmus (Gam- nn A Re RR ER er 409 fontana (Atyloides) : » : » :... 729 fontanus (Atyloides) : .» . .. .- 729 fontanus (Niphargus) . . . 408, 731 fontanus (Niphargus) . » . »... 732 fontinalis (Gammarus) . .... 513 foraminiferum (Lepidepecreum) . 79 forbesii (Parambasia) . . .. . . 718 forelii (Gammarus puteanus var.). . 406 forelii (Niphargus) . . . .... 406 forelii (Niphargus puteanus var.) . . 406 forellii (Niphargus puteanus var.) 406 formosa (Melita) : : : 2:2... 427 fossarum (Gammarus) . « -» .»... 474 fossor (Exoediceros) . . .»... 239 fossor (Oedicerus) . » :..... 239 fougneri (Cheirimedon) . . . . . 720 fragilis -(Gammarus) . . » ..... 454 fragilis (Paramphithoe) . . .:... 354 fragilis (Phreatogammarus) . . . 454 fragilis (Rhachotropis) . : .. . - 354 fragilis Rozinante) . . . .... 354 fragilis (Tritropis) . - : : : 2... 354 franciscana (Megalorchestia) . . . . 528 franklini (Orchomenella) . . .. 721 frauenfeldti Xenodice) . . .. - 700 frauenfeldti (Zenodicee) . ..... 700 frequens (Jasse) .....:2..% 656 frequens (Podocerus) . . .» .»... 656 fresnelii (Amphithoe) . . ..... 423 fresnelii (Gammarus) . . ..... 425 fresnelii (Melita) . :. ...... 423 fresnelli (Melita) . 2 . 2...2..... 423 fueicola (Amphithoe) . . . 2... 449 757 page fucieola (Cerapus) .. ...... 658 Maienis (Mehi) 2°. .......-. 4... 449 fueicola (Pherusa) . . ..... 449 füricols (Pheras) . .....,... 307 fuegeensis (Moera) . .. .»..... 600 fuegensis (Orchestia) . - .». ... . 539 fuegiensis (AnonyxX): . .» :» .... 88 fuegiensis (Gammarus) . .». .. .. 600 fuegiensis (Lembos). . . . . . . 600 fuegiensis (Moera) . . »..... 600 fultoni (Metaphoxus) . . . .. . 139 fultoni (Neoniphargus) . . . . . 731 fultoni (Phoxocephalus) . . . .. . 139 fülva (Birtonna)' ..:,...°...2. 205 fulvoeineta (Acanthozone) 291,293, 305, 306, 308 fulvoeineta (Amphithoe) -. . . . . 291 fulvoeineta (Paramphithoe) . . . . 29 -»- fulvoeinetus (Halirages). . . -. . 291 fulvus (Bircenna) :.- : ..: #... 205 fureicornis (Gammarus) . . .».. 437 fureicornis (Maera) . . . ...».. 437 fureieornis (Moera) . . ...... 437 fureigera (Pontoporeia) . . ... . 128 furina (Leucothoe) . . .. . 165, 724 furina (Leucothoe) . . .»...... 167 furina (Lycesta) : » 2:2: 2.... 165 fusea (Ampelisca). . . » -.». 102 fuscea (Maera) . 22.2.2... 0.8.% 440 Abe (Moers) 2: We 440 kuss -(keridium) 2% 72. 080%: 201 fuscus (Eehinogammarus) . . . . 486 fuseus (Gammarus) : . . .» -»:.. 486 fusiformis (Harpina) . . ..... 144 fusiformis (Phoxus) . . . ..... 144 gabrieli (Atyloides) . - . . - =» - 729 gaimardi (Byblis). - ... 2. ...».. 113 gaimardii (Allorchestes) . . . .. - 581 gaimardii (Ampelisca) 107, 109, 112,113, 113, 113, 114, 114 gaimardii (Ampelisia) . - .». ... - 113 gaimardii (Amphitoe) . . »... - 556 gaimardii (Byblis) . - . ....- 113 gaimardii (Neobule) . ..... 556 GRlanthie; u mar ee 559 galatese. (Hyale) 1:2... 563 ET a ER EEE 723 gallensis (Stenothoe) . ». .» .. - 725 Gammaraeanthus . -. .. 2... 501 Gammaracanthus . . . - 507 Bee N RER 449 Gammarellus 1, 89, 163, 321, 374, 460, 479, 524, 530 Gammarellus +. u ni 386 gammarellus (Cancer) . .». .» 2... 532 gammarellus (Gammarus) . . .. - 532 gammarellus (Öniscus) . . » » . . . 5832 758 page gammarellus (Örchestia) 528, 529, 529, 533, 634, 534, 588, 588, 539, 540, 540, 542, 543, 548, 550, 550, 551, 551, 557 gammarellus (Orchestia) 532 Keanmaridae.". uns 5 G&eammaridaß:......,r, 364, 729 Gammearidea era . 5 ET TE RER 88, 364 GANMELIURS: 21... 0 nn 1, 364 RU RFInE 5 2 ae ne alas 5 gammaroides (Amphithoe) . .. . . 642 gammaroides (Pleonexes) . . . 642 gammaroides (Sunamphithoe). . . . 642 Gammaropsis. .. :... 594, 610, 623 GERINGER 2 a un rn 1 TE er 460, 733 gammeroides (Amphithoe) . . . . . 642 gardineri (Eurystheus) ..... 738 gardineri (Gammaropsis) . .... 738 EIN a BE PELFE TEE | gaudichaudii (Amphitoe) ..... 636 gayi (Amphithoe). ....2.... 428 gayi (Amphitoe) .. 2.2... 2... 428 BAT CME) a 428 gayi (Orchestis) .. - .. „2... 741 gazella (Allorchestes) ...... . 572 gazella (Amphithoe) ....... 572 gusella. (Hysle) 2.0; 565 gazella' CHyB8le), - . . 1.2: ei 572 geelongi (Hippomedon) . . . . . 60 genieulata (Iphimediopsis) . . . . . 741 geniculatus (Phoxocephalus). . . 136 genieulatus (Phoxus). . ...... 136 georgiana (Apherusa) . . . . . . 308 georgiana (Hyale). ....... 572 georgianus (Allorchestes) . . . . . 572 georgianus(Calliopius). . . » ... 308° gerstaeckeri (Gammarus). . . . . . 446 gerstaeckeri (Plesiogammarus) 446 gerstfeldtii (Dybowskia cancellus var.) 730 gerstfeldtii (Gammarus cancellus var.) 377 gerstfeldtii (Pallasea) . . . . 377,730 gibba (Ampelisca). . . ..... 101 gibba (Amphithoe) . ...... 296 gibbosa (Dexamine). ....... 513 gibbosa (Lampra). . . 2. ..... 517 gibbosa (Phippsia) . . ..... 90 gibbosa (Tritaeta). -. . ..... 517 gibbosus (Aspidopleurus). . . . . MM gibbosus (Atylus) . . : 2......... 517 gibbosus (Monoculodes) . . . 259, 726 gibbosus (Stegocephalus) . . .. . 90 gigantea (Alicella) . . ..... 63 gigantea (Andania) . .»....... 97 gigantea (Bovallia) . . ..... 357 gigantea (Euandania) . ..... 97 giganteus (Stegocephalus) . .. . . 97 Alphabetical Index page gigas (Anonyz). : von nu .....64 zigas (Uristes) .:: „an re, 64 RER SEN 155 GitanopBisE: een 153 glaber (Amphithopsis). .. ... . 318 glaber (Atylus). .... . | glaber (Gammarus) . . ... 2... 401 glaber (Miceruropus). ...... 401 glaber (Parapleustes) ....... 318 glaber (Pleustes) .. ..... se. 818 glaber (Sympleustes) . .... . 318 glabra (Paramphithoe) . . .... . 318 glacialis (Amphithopsis) . . . . . . 307 glacialis (Apherusa) . -. ..... 807 glaeialis (Leucothoe) . ... . { 189 glaeialis (Metopa).-.. .. . 2... 189 glaeialis (Montagua), . .. .... 183 glacialis (Proboloides). . ... . 189 glacialis (Pseudalibrotus) . . . . 718 glacialis var. leucopis (Pseudalibrotus) 718 glaeilis (Parapleustes) . ...... 320 gladiosa (Melita) . ...... . 428 KSUEDROER a re 676 N SEELE EEE 60 aiyoertin. a TE RITTENL, ET EEE . 412 Gmelinopeis!. 2 Zn are 414 godeti (Niphargus) . ...... 409 godlewskii(Acanthogammarus) 510,734 godlewskii (Ceradocus) . . :... 510 godlewskii (Gammarus) . . »... 510 godlewskii (Polyacanthus) . .. . . 734 godlewskii var. vietorii (Gammarus) . 510 godlewskii var. vietorii (Polyacanthus) 734 RB; ir ser a a goes (ABHNYX) u... 4 ie 45 go (Meiste) 2». mia ae 427 goesii (Nannonyx) .. ...... 36 goesii (Orchomene) . .:....... 36 go&esi (Melphidippa). ...... 335 goniamera (Jassa). -..-..... 739 Baplane A era 368 gordoniana (Dexamine) ...... 330 KORBRR 2, e 304 gracilicornis (Allorchestes dentatus N EEE 578 graeilis (Allorchestes) . . . . .» » 572 graeilis (Amphithoe). . . .» . ..». 641 grachhe (Adre) wie Su 587 gracilis (Apherusa) . . ..... 727 graeilis (Bathyporeia) . . . ... 121 gracilis (Crangonyx). ». ». »....- 390 gracilis (Eucrangonyx) . -.... 390 gracilis (Gammarus). .. ..... 472 gracilis (Hyalsyı. a ER 572 gracilis (Leucothoe). .. .... 168 gracilis (Lonchomerus) . . . ».. 587 Alphabetical Index 759 page page gracilis (Orchestia (Talorchestia)). . 55l | grimmi (Niphargoides) .. . . . 452 gracilis (Paramphitho@) . . . . 313,320 | griseus (Monoculodes).. . . : . - 262 gracilis (Parapleustes).. -. . - „ . 320 | griseus (Oediceros) . . . 2.2... 262 graeilis (Rachotropis) . . .» » . » - 353 | groenlandica (Metopa). ... . 190, 725 gracilis (Rhachotropis) . . . . . 853 | groenlandica (Örchomene) . . .. . 83 graeilis (Schraderia). . . .» : » » 308 | groenlandica (Orchomenella) . . 83 gracilis (Synopia) . - » »»..-». 271 | groenlandieus (Anonyx) . ....» 83 gracilis (Talitrus) . . . .»-..... 55l | groenlandicus (Proboloides) . 190, 725 gracilis (Talorchestia). . . . . . 55l | grossimana (Maera). .... 5480 graminea (Allorchestes) . ... . . 564 | grossimana (Maera) ........ 438 graminea (Hyale)........ 564 | grossimana (Moera) . .»..... 435 gramineus (Allorchestes). . . . » . 564 | grossimanus (Astacus). . . :.. 435 grandicornis (Allorchestes) . . . . » 566 | grossimanus (Cancer (Gammarus)) . . 435 grandicomis (Halice) . . . .» .. - 229 | grossimanus (Gammarus). . ... -» 435 grandieornis (Hyale) . .... . 566 | grossimanus (Moera) . . ».... 435 grandicornis (Orchestia) . .. . . » - 566 | grossipes (Cancer) . .».»..... 686 Grandidierella . ... . 2... 739 | grossipes (Corophium). . . ».. - 686 grandimana (Amphithoe). . ... - 645 | grossipes (Gammarus) . . .... 686 grandimana (Amphithopsis) . . . . 318 | grubei (Monoeulodes) . . .... - 237 grandimana (Autonoe). ..... - DW GRUDIAN HE er 5 644, 738, 739 grandimana (Dautzenbergia) . . . 728 | grubii (Crangonyx) . » .» x...» - 379 grandimana (Leucothoe).. . . . . 168 | grubii (Dybowskia) . ..»..»..... 730 grandimana (Protomedeia) . . . 738 grandimanum (Probolium) . . . . . 187 grandimanus (Amphithoe) . . . . . 634 grandimanus (Chevreuxius) . . . 670 grandimanus (Leucothoe) . . . . » 168 grandimanus (Microdeutopus) . . . grandimanus (Proboloides) . . . 187 grandimanus (Sympleustes) . 318, 728 grandis (Phoxocephalus) . . . . . . 147 grandis (Phoxus) . . ....... 147 grandis (Pontharpinia) . ... .» 147 grandoeulis (Calliope) -. . .» »..» . 296 granulosus (Nototropis). . . - . 728 granulosus (Paratylus). . . ... » . 728 EN EB 386 er a ee 386 gregaria (Metopa). - » .:.... 189 gregaria (Pontogeneia) . .» »...- 358 gregaria (Stebbingia) . . . .» . . 358 gregarium (Probolium) . . .... 189 gregarius (Proboloides) . . . . . 189 grewingkii (Brachyuropus) . . . 393 grewingkii (Crangonyx) . .» ... . 393 grewingkii (Gammarus) . » ... 393 grillus (Orchestia) . : ..... 540 geillas (Taliteus) .. + =... 2..22840 ee re Et ME 162 grimaldii (Hyale) . ..... 567, 736 grimaldii (Orehomene) . .... 88 grimaldii (Rachotropis) . . .» . . » 729 grimaldii (Rhachotropis) 350, 729 grimaldii (Tritropis). . » . ». . . 350 grimaldii (Urothoe) . . ..... 130 grimmi (Dikerogammarus). . . . 459 grimmi (Gammarus). . »..:..2.459 grubii (Gammarus) . » 2»... . 8379 grubii (Pallasea) . . . . . . 379, 730 gryliotalpa (Mierodentopus) . . . . 59 gryllotalpa (Mierodeutopus) . . . 590 gryllotalpa (Mierodeutopus) 590, 593 gryllus (Euryporeia). . ...... 73 gryllus (Eurythenes) . ..... 73 gryllus (Gammarus). . .»...... 73 gryllus (Lysianassa). ». .». ».... 73 gryllus (Orchestia) . . . .. » ... 540 gryllus (Talitrus) . . .. . . «55 gryphus (Orchestia) . . x. .... 545 N ee RR FEN 12 a A 717 BE ER 12 guerinii (Montagua) . . »..... 19 guerinii (Stenothoe). . .». .».... 199 EFICHHOTHER A Ne ers 521 guernei (Byblis). .. ...-.. 114, 722 guernei (Gammarus) 462, 733 guernei (Orchestia) . » ». :» .. 536 guilelmi (Cyclocaris) . . . . . 31, 717 guilliamsonia (Bathyporea). .... . 120 guilliamsoniana (Bathyporeia).. . 120 guilliamsoniana (Thersites).. . - . » 120 guilliamsonia (Thersites). . . . . » 120 Galbarchisia 2 HN en 238 gulliveri (Talitrus) . . » »... 526 gulosa (Lysianassa) . » . : »... 74 gulosus (Anonyx) ., . x... ... 74 guttata (Protomedeia) . . » ».. - 629 guttatus (Acanthonotus) . . - » » » 331 guttatus (Amphithonotus)-. . . . .» 331 guttatus (Amphitonotüs). » . . . „ 831 guttatus (Leptocheirus) . . . . . 629 760 Alphabetical Index page page guttatus (Nototropis) : - -» . » - 331 | hawaiensis (Parorchestia) . . 558,735 haasei (Gdammarus) . . .» :» » - - 733 | heibergi (Dexamine). . . ..... 516 haemobaphes (Dikerogammarus) 458 | Heiscladius. . . 2» 2. ..% 606 haemobaphes (Gammarus) . . . »- - 458 | Heiseladus . . .. »- BIRPEREPUEN - 606 Hoakonbosckia ; ;.......8.2:. 080 1 als Zu, ee 675 Halbroiie x... u a ne 85 1. Hialella 04 2 2 een ee 675 EN N ER BR], ZUR 398: Bellaiss2 2,3, 2.22. er 521 Malieniden 7 een 221 | helleri (Allorchestes) . . . . ,... 575 Halicreion EEE SENEEER 247 | helleri (Eiyale): - =. 3.0 mia #238 578 Halierion +. 222.8. 2.0.88 % . -.. 247 | helleri (Rhachotropis).... - . . . B5l nmdan „u, al re 249,255 | helleri (Rhachotropis) . . .: . . . 352 REITEN 290 | helleri (Tritropis) . . :. -»»...» 351, 352 Kelisagon 5 Sr a 304 | helvetiae (Eusirus) -. ».: 2.2... 341 Hallragoiden ... 4.0... 4 303 | helvetioe (Eusiru) .».. . er, DR Helirhages . . . .r...u.. 00 ne 794 | herdmani (Platyischnopus) . . . 722 hamatipes (Argissa). ... - » - 277 | herdmani (Podocerus) . . .».... 653 hamatipes (Syrrho@). . . » » » » . 277 | heteroclitus (Pephredo) .... .» . 715 hamifera (Colomastix). -. . . . - 207 | Heterogammarus . . ..2....% 494 hamifer (Colomastix) . - .». .»: »- » 207 | heuglini (Amathilla). .. . .... 381 hamigera (Maera). . . .» . .» . » 4387 | heuglinii (Amathilla) . » :.... 381 hamigera (Moera). . ». 2... 437 | heuglini (Wayprechtia) ..... . 730 hamulus (Amphithoe) . ...... 645 | heuglini (Weyprechtia) .. . 381,730 hamulus (Sunamphithoe). . . . 643,645 | Hippias . .» 2... 2... . 795 hamulus (Sunamphitoe) . ... » . 645 | Hippomedon ..„ sn... ..% 42,65 hamulus (Synamphithoe). . . . . - 845 | Eippomedeoen‘ . sry 58, 719 hanseni (Anamixis).. . ».. . . 170 |; Hirondella. . 2.2.2.2... ee? hanseni (Monoculodes) . . . . . 29:3 imondellen. ru. 16 hanseni (Orchomene) . . ». ... 46 | hirondellei (Maera) . . . .... 732 hansoni (Cheirimedon) . . . . . 720 | hirsuts (Grubia) : » 2.2... 738 Maploeheira: 5. reinlesen 609 | hirsuticornis (Dereothoe) . .. . . 605 haplocheles (Kroyeria). .. . - 242,243 | hirsutieornis (Dercotho& (Cerapus)). . 605 haplocheles (Pontoerates) . . . . - 243 | hirsutiecornis (Dulichia) . ..... zıl haplocheles (Synchelidium) . . . 242 | hirsuticornis (Gammarus). . .. . - 605 haplocheles (Synchelidium) . . . . 243 N ee re EERESNAR 609 ne Kara 720 BEBDIOODE. 2.0 e 116, 722 Harmomia . . „nn mie 383 ER a ee 383 BEBLIIDR a 140 BRD an a nie 140, 723 Herginioides . . ... 2.0.00 3. 298 BEREIBOdBE ia ie 298 hastata (Tessarops) . . ......» 276 haswelli (Amaryllis) . ..... 23 haswelli (Cyrtophium) . .. . .. » 704 haswelli (Liljeborgia) . . . : . » -» 233 haswelli (Maera) . .. : 2... ...648 haswelli (Megamoera) . . ....» » 442 haswelli (Mierodeutopus) . . . . 591 haswelli (Nicippe).. . -..... 233 haswelli (Wyvillea). ...... 648 Haustorlidae. 2. 4% 118 BHaustorius u ae 124 hawaiensis (Allorchestes). . . . » - 573 hawaiensis (Hyale) .. . . ...... 578 hawaiensis (Orchestia). .. . . ...» 558 hirsuticornis (Mieroprotopus) i «605 hirsutimana (Protomedeia). #_. . . 627 hirsutimanus (Leptocheirus) te A hirsutimanus (Protomedeia) . . . .. 627 hirsutimanus (Ptilocheirus) . . » „ . 628. hirsutipes (Lembos). . hirsutus (Eurystheus). . . . 615,737 hirsutus (Eurystheus) . . .».. - 737 hirsutus (Gammaropsis) ». » » - . - 615 hirticornis (Dulichia) . . . . - - 7ıl hirtipalma (Allorchestes) . ... . 564. hirtipalma (Hyale) .. ..... 564 hirtipalma (Hyale (Allorchestes)) . . 564 bispans. {Opis).:.. ou. el ya a 22 hispana (Opisa). ..»- -.v. .. 22 hispana (Sophrosyne) TR hoeki (Barentsia) ..» ». .... 238 hoeki (Gulbarentsia) . . ..» - 238 hoeki (Podocerus) . ». x... ...- 661 holbölli (Anonyx) . -» 2.2.» 58,59 holbölli (Hippomedon) ... . - 58 holbelli (Hippomedon) . . . . . 59,69 heibollii (Phase) 4... .=..%..0: aa ;6. 154 holbölli (Lysianassa) . . . Alphabetieal Index " page holbölli (Phoxocephalus) . . . . 134 holbölli (Phoxus) . .. . . ET . holmii Eusirus) . ». »...... 342 homari (Amathilla) . . . - 387,387, 392 homari (Astacus) . ». 2... ...- 387 homari (Oancer (Astacus)) . .» » . - 387 homari (Cancer(Gammarellus)) . . . 387 homari (Gammarellus) . . . . . 887 homari (Gammarellus) .....- 388 homari (Gammarus) . .».....-. 387 homoehir (Atylus) ...:.... 333 homochir (Nototropis) . . . - - 333 hopei (Callisoma) ...... .» » 62,62 hopei (Scopelocheirus) . . .» . .. 62 Be ran 73,75 höaringii (Tryphosa). ..... . 71 Ve 728 hornelli (Leucothoe) . . .. . - 724 hörringii (Tryphosa) ....... 71 hörringii (Tryphosella)..... . . 71 hoyi (Pontoporeia) . ..:...». 128 - humeralis (Amphithoe) . . .. ..- 636 humeralis (Ampithoe).. . - 636 humicola (Orchestia) . . ... . 539 humilis (Allorchestes) . . . . . 584 Blie CRROBNE en 45 humilis (Lysianassa) ...... . 45 hunteri (Cerapus) . .. . 2. ... 673 hunteri (Erichthonius). . . . . ER 3} hunteri (Eriethonius) . . . . 673,740 huxleyana (Acanthozone) . . . ..- 291 huxleyanus (Atylus) .. ...... 291 huxleyanus (Halirages) . . .. - 291 huxleyanus (Halirages) ... : . . 292 hyaeinthinus (Gammarus) 475 ee ee 559, 735 a a 584 Blale ne 574, 736 NN EEE RER 374 hyalina (Westwoodilla) . ....». 250 Hyperiopsidae....... ...114 EDORIOHBIR.: nee 714, 741 hystrix (Acanthosoma) . ..... 325 hystrix (Acanthozone). . - . . 324, 325 bystrix (Amphithoe) . ...... 325 hystrix (Boeckia) . . ... . n 391 hystrix (Cyrtophium) . . ..... 697 hystrix (Laematophilus) . . .»... 697 hystrix (Laetmatophilus) 697 hystrix (Paramphithoe) . . . . . 325 ibex (Echinogammarus) . . .. . 492 Sabex (Gsmmarıs) - .u3'2:, „055 492 BRENODRME. ae ee a 52 Ainopün si... ee 86 lehthyomyzocus .......,... 208 ee SP 706 en PR | 761 page ER ER . 230,231 DB eye 234 N a FRE .. 234 ignotus (Gammarus). ». ».. 2... 495 ignotus (Heterogammarus) 495 imbricata (Graya). . . . 2.2. 387 imbricata (Grayia) . . 2.2...» 887 imbricats (Hyale) . 2,7. 2... 568 imbricatus (Allorchestes). . . . 568, 578 imparicornis (Leucothoe). .. . . . 167 imperfectus (Niphargus elegans var.) .. 409 impostii (Gammarus) . ...... 435 inaequalis (Orchestia). . ... . 542 inaequimanus (Gammarus) . . . . . 425 inaequipes (Amphithoe) ..... . 435 inaequipes (Maera) ....... 435 inaequistylis (Amphito& (Melita)) . . 429 inaequistylis (Melita)). . . 429, 732 inea (Allorchestes) ........ 564 incerta (Hornellia) . . ..... 728 iuserta (Mvers) 2. 2... 24. 445 incerta (Podoprionides) . .... . 741 incerta (Unciola) ........ 681 ineisa (Acanthozone) .-...... 287 ineisa (Leucothoe) . .... 167, 724 ineisimana (Orchestia). - .... . 540 ineisus (Chosroes). . .. .... 287 ineonspieuum (Platophium). .. . . 702 inconspicuus (Podocerus) . . . . 702 inda (Amphithoe). . . .. 2... 640 1988 (Ampithoe) 2.20.00... 640 indiea (Amphithoe) . ....... 640 indica (Amphitoe). -.. . 2... 640 IBdiea(MBEL8). ie, 440 indica (Megamoera) . . . ..... 440 indieus (Anonyx) .. ...... 86 indieus (Gammarus) . . ..». 2... 440 inermis (Allorchestes dentatus var.) . 578 inermis (Amphilochus). .. .».. - 154 inermis(Amphithoe). ... ..... 359 inermis (Atylas).. : - nie:a are 359 inermis (Epimeria) .. ..... 128 inermis (Gitanopsis) . . . ... 154 inermis (Halirages) . - ». » : ... 303 inermis (Haliragoides) . . . -. » - 803 inermis (Hyalella) . -..... 578 inermis (Paramphithoe) . . ..» .- 359 inermis (Pontogeneia). . . -. - - 359 inflata (Rhachotropis) . . .. . - 351 Na 1) ee er 351 inflatum (Acanthonotosoma) . . . - 219 'inflatum (Acanthonotozoma). . 219 inflatus (Acanthonotus) . . ..» » » 219 se CAbvlas) u... 01. u a 399 inflatus (Gammarus). . . . . 399 inflatus (Mieruropus) . . ... » 399 inflatus (Stegocephalus). . . . - 91 762 page inflatus (Vertumnus) . .» .» 2... 219 ingens (Ampelisca) . .: .. . $ 100 ingens (Jassa). . ». - : - 658 ingens (Podocerus) : . » . .- .. 653 ingens (Pseudophthalmus) . . . . » 100 ZUEOBA a et 726 Inzui1Hellldae:. 7275227 725 innominata (Seba). :. . ..... 162 insatiabilis (Melita) . .. .».... 741 inseulpta (Orchestia (Talitrus)) . . . 527 inseulptus (Talitronus). . . . .. . 527 insignis (Elasmopus) . ..... 732 insignis (Tryphosa) . ...... 69 integricauda (Ambasia) . . . ... 85 integrieauda (Nannonyx) . . . . 535 integrimana (Maera). .. ..... 435 intermedia (Amphitho@) . . . . . . 738 intermedia (Ampithoe) . . . . . 738 intermedia (Protomedeia) ß 621 intermedium Eyncheläiun). 243 intermedius (Amphilochoides) . 153 intermedius (Byblis). . . .»..... 113 intermedius (Cheirocratus) . . . 419 intermedius (Gammarus smaragdinus 1 2 DET a rg 398 intermedius (Paroediceros) 245 intrepida (Allorchestes) .. .. . - 581 invalıda (Metopa) 22.3, 0.70% 182 Re 447 IDHISBENDHaE 2 2 447 EN ES gr ee 204 TONIDadIB. 7.2... 2 nes 214 T5n1m641088.,.,.%.:... 327 0% 210 EURER EHE 210 Tolımiedkomeis 2-0 3. 21l Ipiinarun 1:2, Rn 204 TORSRIBLBIRN NN NER THE 203 a a 680 itroraks: (Dryope) ; .7.,.7. 572728; 680 irrorata (Uneiola)'. 67 7, 678, 679, 680, 681 irrorata (Undiola) - 42% 678 irrostrata (Urothoe) 129, 130, 130, 131,131, 131, 132, 146 irrostrata (Urothoe). . . ... . 132 irrostratus (Urothoe) . .». .. ... 132 N 2 RE REN ET NEE 630 ABRGIAHB.. ne 630 IBSsInan: „EU 650 ischnus (Gammarus) . . .... 470 Jachyrocaras SE 796 Ischytoeeridas.. : Am 2 5% 647 ISsehyrocerüß: 20 en 657, 739 Jöchyrocerus. nt een 602 Tnopaa 2 Ta ae Das LT 630 BE GERA I WE 796 180108. u 796 isopus (Podocerus) . .. :.... 658 Alphabetical Index page istrica (Amphithöe (Hyale)) 584 Istrien (Niose) ".. 0. ie ee ee 584 istrieus (Allorchestes) . . . . . . 584 JUBEL, 2.2220, ER rt 649 japonica (Allorchestes) .. ... . 584 japonieca (Ampelisca) ...... 111 Japonica (Amphithoe) .. . .... 638 japonica (Ampithoe). . . .... 638 japonicus (Allorchestes) . . . - - 584 ER a EEE Te 649 RE 1 RN NE Nr 652, 759 N RR 647 JOEt CHIYRBB)T 2.0 ee een . 578 jelskii (Hyale (Allorchestes)) . . . . 578 jelskii (Hyalella) . .. .. . a 578 jurinei (Amphithoe). . .. 2... 307 jurinei (Apherusa) . . .» .. .. 307 jurini (Amphithoe) . ....... 307 jarinii (Apherusa). . . ». 2... 307 jurinü (Pherusa) ....... : 307 kallarthra (Byblis) °. 2 %2722,.:% 115 kallarthrus (Ampeliseca) . . ... » 115 kallarthrus (Byblis) . . . ..... 115 bt a 721 Barguplenia. ea 11 kergueleni (Acanthozone) ..... 349 kergueleni (Acontiostoma) . . - - . 16 kergueleni (Amphithoe) . . .. . . 638 kergueleni (Ampithoe) . . .. . 638 kergueleni (Anonyx). . » » »... 69 kergueleni (Aora). . . 2. 1.°.%% 587 kergueleni (Autonoe) ....... 598 kergueleni (Hippomedon) .. . . . 69 kergueleni (Hoplonyx). . ». ...» » 720 kergueleni (Lembos) . ..... 598 kergueleni (Lysianassa) . .». .».. 69 kergueleni (Phoxocephalus) . 135 kergueleni (Phoxus). . . »... . 135 kergueleni (Rhachotropis) . . . . 349 kergueleni (Socarnoides) . . .. 47 kergueleni (Tritaeta) . ..... . 520 kergueleni (Tryphosa) 69, 720 kergueleni (Zaramilla). . . .. . 36l kermadeeci (Podoceropsis) . . 619 kervillei (Parametopa) . : .. . 725 kesslerii (Amathilla). .. ..... 378 kesslerii (Dybowskia) . . .». ... 730 kesslerii (Gammarus) . . .»..... 378 kesslerii (Pallasea) . ... . 378, 730 kesslerii var. europaeus (Gammarus) 877 kesslerii var. europeus (Dybowskia) 730 kessleri (Stegocephalus) . . . . . . 90 kidderi (Lysianassa) . . ». .» 2... 36 kidderi (Nannonyx). . . .... 36 kietlinskii (Gammarus) . . . . . 469 kinahani (Liljeborgia) . . . . - .- 233 233 kinahani (Lilljeborgia). . . » » . » Dal re at 5 TE nr RES R 2 3 N } j k N Ex Sr ae Ba FR ie, ar r EN Alphabetical Index . ‚page kinahani (Phaedra) . . .».....-. 233 klukii (Atylus) . . 2»... - PH klukii (Gammarus) . » . 2... 403 klukii (Mieruropus) . . »- » . - .» 403 knickerbockeri (Allorchestes). . . . 575 kochianus (Niphargus) . . . 408, 731 korotneffii (Acanthogammarus) . 734 korotneffii (Polyacanthus) . - . - - 734 N ee 258 er er ih kröyeranus (Siphonocetus) . . . . » 684 kröyeranus (Siphonoecetes) . . . 684 ee 258 mer (Anonyz) . 2... +». %% 62 kröyeri (Callisoma) . . ...... 62 kroyeri (Ephippiphora) . ... . 087 kroyeri (Gammarus) . . » 2 2... 436 kröyeri (Glauconome) . ». .».... 679 kröyerii (Gammarus) . . .:.... 472 Bye (PROZOB). ev a 136 kroyeri (Lysianassa) . - » » » . . 86,57 ser (Meere). ei 436 kröyeri (Megamoera) . ..... - 436 kröyeri (Monoculodes) . . . . . 261 Beyer (Phozus) 12%. u. 134 kroyeri (Socarnes) . . ..... 57 kuhliana (Secamballa) . . ..... 545 kükenthali (Anonyx) . » ..... 54 kürgensis (Amathilla) . . ..... 440 kürgensis (Gammarus). - » ». .» . 440 kürgensis (Maera) . . ..... 440 a nr TR kuriensis (Hyale nilssoni var.) . . . 736 kusnezowi (Gammarus) . ».... 413 kusnezowi (Gmelina) . . ... . 413 labbei (Acanthogammarus) . . . 734 lacertosa (Amphithoe) ..... 633 lacertosa (Ampithoe) . . .... 633 lachneessa (Urothoe) ...... . 132 lachneössa (Urothoides) . . . . - 132 laeteus (Gammarus) . . 2... .. 410 laeustris (Gammaracanthus). . . 507 lacustris (Gammaracanthus loricatus a EP LE 07 laeustris (Gammarus) . . .. . . 474, 733 en 5 NER 741 ladmiraulti (Niphargus). . . .. 731 Bsemsatophilus "1. uni 695 Laetmatophilus . . . » 2... ..69 eimophbilas ..... ee 695 laeve (Cyrtophium) . . . .... 698 laeve (Platophium) : .. ... - 704, 741 laevigata (Ampelisca) . . . . . 100, 110 lJaevis (Apherusa) . . .. .... 308 laevis (Dexiocerella). . . . 2... 704 laevis (Busirus). . . . ..... 729 laevis (Gammarus) 763 page laevis (Guernea) . ..»... 521, 735 laevis (Haploops) . . . ..... 117 isevis (Harpinia) . . 2... 145 lasvis (Orchestia). . 2, 2.2. 531 laevis (Orchomenella) . . . .. . 8l Iuavis (PHOrOBB) 0 308 laevis (Podocerus). . ... . 704, 741 laeviuscula (Acanthozone) . . . 296, 297, 304, 307 laeviuseula (Amphithoe) .. . .. . 296 laeviuseula (Amphithopsis) . . . . . 296 laeviuseula (Calliope) . .». ». ». .» .» 296 laeviusceula (Gmelina). . . . .. 413 laeviuscula (Paramphithoe). . . - . 296 laeviusculus (Calliopius) 296 laeviuseulus (Calliopius) . . .» .. . 296 Hafystildae,; m. Dr 208 TBEVBHUBSS TEN WS a era 208 lagena’(Anonyz): 372... 74% 54 lagena (Anonyx) . .»:...... 54 lagena (Lyeianassa) . . ». .» »...- 54 lagena (Lysianassa) . . ..... 54, 54 lagowskii (Ceradocus) . » » .. .» » 498 lagowskii (Gammarus) . . » : .» 498 lagowskii (Parapallasea) 498, 733 lagowskii (Pleuracanthus) . . . . . 733 5 ar jr + 587 DT BR 2 ir 587 EN er 517 a er 286 IAOTEOOB 2 ae Ve es 286 Bapkyssiidse SFr a ee 208 Laphystiopsidae. ...... 209 baphystiopsis 7.22 209 Baphyatine: 208 largimana (Amphithoe) . ..... 644 largimanus (Podocerus) . 644 tata (Brandtiay 2.2... 22235 396 latibrachium (Elasmopus).. . 733 laticorne (Acidostoma) . » . . - 14 laticornis (Acidostoma) . » »... 14 laticornis (Uneciola) . . ..... 677 latimana (Hyalella) . ...... 577 latimana (Metopa) . ...... 177 latimana (Normanfd) . »..... 67 latimanus (Allorchestes) . . . . . . 577 latimanus (Cerapus) . . -. » 2... 671 latimanus (Cheirimedon) 67 latimanus (Hyalella) ....... 577 latimanus (Monoculodes) 264 latimanus (Oediceros) . . . - 264 latior (Gammarus) .... v2... 396 latipalpus (Atylopsis) . . . . . - 727 latipes (Acanthozone) . 817, 318,319, 319 latipes (Aceroides) . .. .. - - 255 latipes (Aceropsis) . » » 2... 255 latipes (Amphithoe). . ». .».... 317 764 page latipes (Amphithopsis). . . « . . . 817 latipes (Elasmopus) . » » » 2... 444 latipes (Halicreion) ©.» 2... 255 latipes (Harpinia). . - . - ; 723 latipes (Ischyrocerus) . . . - - 660 latipes (Parapleustes) . . » - -. 817 latipes (Podocerus) . x... - 656, 660 latipes (Sympleustes) . . : . . - 817 latissima (Brandtia). . . : - - . 396 latissima (Pontogeneia) . .». :. . - 396 latissimus (Gammarus). . . ... -» 396 latrans (Oediceros) . ». .» -» »» .» 245 latrans (Oedicerus) - » » . 2... 245 latreillii (Gammarus) . ». 2... 376 Bu Are ee 396 iatus (Gammarus)'; =... . ee 396 latus (Stegocephalus) . . . .- . . 97 leschii (Oaliape) ...:.. « ... #4 296 leachii (Cerapus) - -. . » 2.2... 673 leachii (Podocerus) . » » 2... 672 LSIDBULODUB: „ren ei 698 Lemboides . . .. u... ER '.) BR a 5 Rn Male 588 DEBBBEE HN. ea 594, 757 .lendenfeldi (Corophium) . » . » . -» 609 leonis (Melita) . .» .».» . Sr 741 ANDIGBERTER. ee a 124 Eammasebylus ss Nana 796 Lepidepecreum . . . 2... .% 78 Iopleurus. . nat ers Kr 715 lepta (Ampelisca) -. ... .. . Pen Papa TREU, FE. 115 Ieptamphopus. 52,25 2933 leptocarpa (Metopa)... ..... 178 leptocarpus (Eusirus) . . . . .. 341 leptocerus (Echinogammarus) . . 490 leptocerus (Gammarus) » » . :. - 490 leptocerus var. nematocerus(Gammarus) 490 MEDtoch@lruß u. Atari 625 Ieptochela.; „an ern 19,19 leptochela (Opis) . =... 2... 19 Dastoohirns 2 ae ee 625 leptonyx (Amphithöe (Amphitonotus)) 517 kilkonyx (Atylas) m: ll; 517 leptonyx (Dexamine) . .: ... 517 Lptophozus: a Satire een 136 DRSIIBBB 2 re 433 leueopes (Uneiola) . .».... 678, 679 leucophtalmus (Hoplonyx) . . . » . 720 leucophthalma (Rhachotropis) . . 353 leueophthalmus (Hoplonyx) . . .. 76 leucophthalmus (Tmetonyx).. . 76, 720 leucopis (Anonyx (Onisimus)) . . . 28 leueopis (Glaueonome). . . 2... * leueopis (Önesimus) . » 2 2... 28 leuceopis (Onisimus). . . 2.....328 leucopis (Pseudalibrotus glacialis var.) 718 - page leucopis (Unciola) . ...... 678 MBUaHtHo0. ee 163, 724 Keupothaidae. . ii 161 Koneothoides . wu 161 Leusothoine. nu ya 161 Leueothoinae. . v2. 20a. 161 leris (Amphithonotus) . . » .. » - 741 less (Moera) ; «441400 ne 443 Bun ASyErhoB). 2 0.25 281 levis (Syrrhoites) . . ». 2... ..281 Iskeborgia u 2 417 Eseborgie nn RER 230 Bijehorgiiuaa... weni 229 illiebasih. x mars 230 Hlljeborgii (Anonyx) . ..... 5> lilljeborgii (Leucothoe) . . 167, 724 limieola (Ampelisca) . ..... 111 limieola (Orchestia) . . 2.» .... 547 limicola (Pseudophthalmus) .... . 111 limicola (Talorchestia) . -. ... 547 limieolus (Pseudophthalmus) . . . . 111 limnaeus (Gammarus). . .... 733. - lindahlii (Podoceropsis) . . . . . 619 lindahli (Podoceropsis) . x»... - 619 lindströmi (Bathyporeia) 122 linearis (Astacus) . . -» - . rc 686 lineata (Cyproidea) . . 2. ..°0.. 160 lineata (Cyproidia) ». ». 22... 160 lineata (Paracyproidea) . . .. . 160 kippus (Atylus) sie aan en 346 lippus (Eusiroides) . . .:.... 346 BASISTONSIdE er 8 Siisijanassipii. u er 8 litoralis (Alibrotus) . . . ». » ’ 33 litoralis (Anonyx) «2. 2.0... 33 litoralis (Lysianassa) . » » » 2... 33 litoralis (Onesimus) . » » 2.2... 33 litoralis (Onisimus) . » 2». 2... 33 litoralis (Pseudalibrotus) . . . . 33 littoralis (Alibrotus). - . 2. ... 33 littoralis (Allorchestes) . . . 585,736 ittoralis: (Anaaya) nn 33 littoralis (Atylus) . u. ..0u..0% 401 littoralis (Gammarus) . » ..... 401 littoralis (Hyale) .. 22... 585, 736 littoralis (Ingolfiella) . ..... 726 littoralis (Mieruropus) . .... 401 littoralis (Orchestia) . . » » .»... 532 littoralis (Psammylla) . ..... 716 littoralis (Pseudalibrotus) . . . . 27,28, 33 Yitoralia ZRalitrus)i schen 525 littores (Orchestes) . . 2.2... . 532 littorea (Orchestia) 532, 583, 534, 542 BitoreusfAstacme)... .. zu na 532 littoreus (Cancer (Gammarus)) . . . 582 littorina (Amphithoe) . . 2.2... 689 littorina (Amphitoe). . . 2... 639 u hen a a lividus (Eehinogammarus) . RISSE lividus (Gammarus) . . » -» 2... 483 lobata (Dexiocerella) -. ». - »... » 703 lobatum (CGyrtopbium) . . 2... 703 lobatum (Platophium) . . » ...» . 703 lobatus (Podocerus) . . » . » - 708 Lockingtonia . .-..... EEE), loeusta (Cancer)... » 2... 476, 525 locusta (Cancer (Gammarellus)) . . . 525 locusta (Cancer (Gammarus)) . . . . 476 loeusta forma mediterranea (Talitrus) 525 locusta (Gammarus) 234, 234, 415, 446, 159, 463, 463, 473, 493, 513, 518, 518, 525 loeusta (Gdammarus) . . .. ....476 loeusta (Oniscw) . . » .... wu.» 525 Joeusta (Talitrus) -.. . 2... 525 loeustoides (Gammarus) . . 2... - 472 Eeachömerns ar. ar 587 longieauda (Gammarus) . . . . 410,429 longieauda (Maera) . . » 2...» . 429 longicauda (Megamoera). . ...» - 429 longicaudata (Acanthozone) . . 289,316 longieaudata (Amphithopsis) . . 289 longicaudata (Photis) . . . . - » 608 longieaudatus (Eiseladus) . . . . - 608 longicaudatus (Gammarus) . . » » - ‘410 longicaudatus (Haliereion) . . - . . 247 longicaudatus (Heiscladius). . . » . 608 longicaudatus (Heiseladus). . . . .- 608 longieaudatus (Niphargus) . . . 410 longicaudatus (Niphargus) . . . . - 410 longieaudatus (Photis). . .... . 608 longicorne (Corophium) . » » » . . 686 longieorne (Lepidepecreum) . . . 80 longieornis (Allorchestes) . . . . . 574 longiecornis (Amphithoe) . ». . . . . 644 longieornis (Amphithoides) . . . 645 longieornis (Anonyx) 799,79, 80 longieornis (Byblis) . . . .... 113 longicornis (Gammarella) .... . 449 longicornis (Gammarus) . . 498,513, 686 longicornis (Grubia). . . .... 738 longicornis (Lysianassa). . .. . 39 longicornis (Lysianassa) . . . . - 45,53 longicornis (Lysianassina) . . . . . 39 longieornis (Lysianax). . -» ».. . 39 longieornis (Metopa) . . .... 179 longicornis (Monoeulodes) . . . . . 258 'longicornis (Monoculopsis) . . . 258 longieornis (Montagua) ...... 200 longieornis (Nicea) . . 2... . 561 longieornis (Örchestia). . . . . 549, 566 longicornis (Podocerus) . . . . 660,644 longicornis (Scamballa) . . . . . . 549 longicornis-(Sunamphithoe) . . . . - 643 longieornis (Talitrus) . .. ... . 549 longieornis (Talorchestia) . . . . 549 Alphabetical Index 765 r page longieornisvar.polyarthrus(Gammarus) 493 longidigitans (Autonoe) . .» 2... 594 longidigitans (Lembos) . . . . - 594 longimana (Acanthozone) 293, 294, 307, 308 longimana (Amphithoe) 634, 788 longimana (Amphithopsis) . . . . - 293 longimana (Ampithoe).. . . 634, 738 longimana (Kuria). . . .... 726 longimana (Megamoera) .. . .. . 438 longimana (Metopa). . ... - 184, 185 longimana (Metopella). . . . . . 185 longimana (Montagua). . . . . 200 longimana (Oradarea) . . . . . . 727 longimana (Photis) . . ....... 738 longimana (Protomedeia) . .» . . - 621 longimana (Stenothoe) . . . . . . 200 longimana (Wyvillea) .. .... 648 longimanum (Probolium) . » . . . » 200 longimanus (Amphilochoides) . . 723 longimanus (Amphilochus) 151, 723 longimanus (Bathymedon).. . . . 257 longimanus (Cerapus) . ..» 2... 673 longimanus (Eurystheus) . . . . 616 longimanus (Gammaropsis) . . » » - 616 longimanus (Gammarus) . . . -» ». 438 longimanus (Halimedon). . . . . » 257 longimanus (Hippomedon) . . . 60 longimanus (Kuria) . 2. ...» 726 longimanus (Leptamphopus) . . 293 longimanus (Microprotopus). . . 605 longimanus (Monoeulodes) . . » . . 237 longimanus (Oediceros) 237,238, 258 longimanus (Paranaenia). . . . . . 616 longimanus- (Perioculodes) . . . 237 longimanus (Photis) . . ... 2...» 738 longimanus (Platamon) . . ....» 60 longimanus (Podocerus) . . ... . 648 longimanus (Wyvillea). . ...... 648 longipalma (Hyalella). .. .. . 577 longipalmus (Allorchestes) . . . - . 577 longipalmus (Hyalella). . » :..» . 577 longipes (Allorchestes). . . » -» - « 576 longipes (Anonyx) ... . 2» 2... 77 longipes (Autonoe) 593, 596, 597, 598, 598, = 599, 601 longipes (Cerapopsis) . . . : ..« 674 longipes (Cleonardo) . ». .» .. . 847 longipes (Eusirus) . .. . 2... 340 longipes (Eusirus) . . »...... 341 longipes (Gammarus) . .. 2... 597 longipes (Gammarus (Gammaropsis)) . 597 longipes (Hyalella) . ...... 576 longipes (Lembos) . ..: .:.».. 597 longipes (Melphidippa) . » . . . . 337 longipes (Mierodentopus) . .« . . 597 longipes (Pontogeneia). . » .» .» - . 847 longipes (Tryphosa). ....... 77 766 Alphabetical Index page page longipes (Tryphosites). . - . . - 71: | mineer KAtylas) 12:2 23: 0 9rin 837 longirostris (Monoculodes) . . . 260 | macer (Ceradocus) . .» » 2... ..837 longirostris (Oediceros) . » . .. . 260 | macleayana (Orchestia) ....». . 538 longirostris (Peltocoxa) . . ».. . 159.1 Mala 5. Reue 648 longirostris (Stegoplax) . . . - - 159 | macra (Melphidippa) . »..... . 337 longistila (Hyalella). ...... 577 | macra (Melphidippella) . . . » . 837 longistilus (Allorchestes). . . . - - 577 | macrocarpa (Photis) . .... . 607 longitarsis (Lalaria). . ...... 587 | macerocarpus (Photis) .. »....» 607 lophii (Dermophilus) . .. .... 208 , macrocephala (Ampelisca) . . . 101 loricata (Epimeria) . - ....». 322 | macrocephala (Amphithoe) . . . . 306 loricata (Lysianassa) . . ..».. 39 | macrocephalus (Dikerogammarus) 458 lorieatus (Ceradoeus) . . . 2... 508 | macrocephalus (Gammarus) . . . . 458 lorieatus (Gammaracanthus) . . 508 | macrocheir (Oediceros) . . .» - » - 245 lorieatus (Gammarus) . . .. . 507,508 | macrocheir (Oedicerus) . . .... 245 lorieatus var. lacustris (Gammar- macrocheir (Paroediceros) .. . 245 Atanthun. 2 aan 507 macrodactyla (Hyale) . . . . 564, 736 loughrini (Dexamine) . ...... 330 | macrodaetylus (Cerapus) . . » » . . 672 loveni (Gammarus) . . .. 2... 438 | macrodactylus (Erichthonius) . . 672, 740 lovenii (Gammarus) . . 2... 378 | macrodactylus (Eriethonius). 672, 740 lovenii (Pleuracanthus) .... . . 730 | macrodactylus (Hyale). . . . . 564,736 10v8n1- (Maers) 68 een 438 macrodaectylus (Pyetilus). . . .. . 672 USERLAMOHER) 2 es 438 | macrodactylus var. pontica (Cerapus) 673 lubbockiana (Galanthis) . . .. . - 568: | Macrohectopus . .... 2...» 394 lubbockiana (Hyale) -»...... 568 | macronyx (Autonoe) . » 2.2... 623 lubbockiana (Nicea). .:..... 568 | macronyx (Gammarus (Gammaropsis)) 623 lubomirski (Hyale) .. ...... 579 | macronyx (Hyale) ... 2.2... 570 lubomirskii (Hyale (Allorchestes)) . 579 | macronyx (Liljeborgia) . .. - - 231 lubomirskii (Hyalella) ..... 579 | macronyx (Lilljeborgia) . . » - - » 231 eh A ICaI rt 566 | macronyx (Mierodentopus). . . » . 623 lueidus (Sperchius) . .. ...». 716 | macronyx (Microdeutopus) . . « . . 623 lueifugax (Allorchestes) . . ... . 576 | -macronyx (Nicea)...... 2... ‚570 lueifugax (Hyalella) ....... 576 | macronyx (Orchomenella). . . . 721 lueifugus (Apocrangonyx).. . . . 370 | maeronyx (Synopioides) . . . . 227 lueifugus (Crangonyx) . . . : .. . 370 | macrophthalma (Amaryllis). .. 24 ET NE RE Re RE TE 715 | macrophthalmus (Amaryllis) . . . 24,24 iatkanı (Eholie). u 608 | macrophthalmus (Amathilla) . . . . 506 TR 2 2 a HE 163 | maerophthalmus (Carinogam- ET 7 RER RE ER FRTUSTER 37 3 1) VRR ee ee 506. lynceus (Oediceros) 245, 245,246, 246,246 | macrophthalmus (Ceradoceus) . . . . 506 lynceus (Paroediceros) . . . . . 246 | macrophthalmus (Gammaracanthus) . 506 Iytlanassa 5.2.50 37,718 | macrophthalmus (Gammarus). . . . 506 INNERER 85 | macropus (Rhachotropis) . . . . 352 Lysianassidae ........ 8 | macrura (Melphidippa) . . . . - 336 TE BREMEN. ea a 8 | macrurus (Gammarus) . ... . 464 USMIRDREBIne 2,21, 8,88 | maculata (Amphithoe). . .».....» 641 Lana 87 | maculata (Ampithoe) . .... . 641 UYSIARBENIUAR u 8 | maculata (Protomedeia) 605, 605, 615, 617, N NE re wer 87 657 Lyslanelar sn an: . 38] | maculatum (Synchelidium) . . . 242 Lysianopsis Wan 718 | maculatus (Eurystheus). . . . - 617 Lysisssidäes: na 8 | maculatus (Gammaropsis) . . »- » . 617 Irina EN 715 | maculatus (Gammarus) 426, 617, 618. maackii (Echinogammarus) . . . 483 | maculatus (Mierodentopus) . . - . 587 maacki (Gammarus) ..-..... 483 | maculatus (Mierodeutopus) . . . . . 587 macera (Dulichia). . -...... 710 | maculatus (Mieroprotopus) . . . 604 macera (Melphidippella) ...... 337 | maculatus (Mieroprotopus). . . » - 605 macera (Palasiella) -. ... 2... 412 | maculatus (Paraphoxus) . . 138,723. FB Eee ea Pitt et ein ans nr 2 ae Linde ae HR LSCh Se a TE N Alphabetical Index 767 page page maculatus (Phoxocephalus) . . . . 138 | marmorata (Talorchestia) . . . ... 536 maculatus (Phoxus) . . » ». +»... .138 | maroubrae (Hyale) . ...... 563 maeoticum (Corophium). .. . . 740 | martensi (Anonyx) . . -..... 87 maeoticus (Gammarus) . . . » .- 467 | martensii (Örchestia) - ...... 553 Er En Se a EN 433, 732 | martensii (Talorchestia). ... . 553 En Me Er NE 610 | martensi (Lysianassa). ..... 87 N 797 | massavensis (Maera) . ..... 440 magellanica (Lysianassa) . .. . . 73 | massayensis (Moera). . . .»... 440 magellanica (Metopa) . ». - » .». . 185 | massiliensis (Grubia taurica var.) - . 644 magellanica (Pontogeneia) . . . 360 | mastersii (Maera). ....... 439 magellanica (Stenia) - - -» » =. 88 | mastersii (Megamoera). ...... 439 magellanicum (Acontiostoma) . . 15 | maximovicezi (Amathillina) . . . 500 magellanicus (Anonyx) -» » 2... 88 | maximovitschi (Amathillina) . . . . 500 magellanicus (Atylopsis) . - - . -» . 360 | maximus (Acanthogammarus) . . 734 magellaniceus (Atylus) . ». ».... 360 | maximus (Polyacanthus) .. ... . 734 magellanieus (Eurytenes) . .. . . 73 | media (Allorchestes) . ...... 569 magellanicus (Metopoides) . . . 185 | media (Hyale). . . ... 2... 569 mahafalensis (Grandidierella) . . 739 | media (Hyale (Allorchestes)). . . . 569 major (Hyale nilsoni var)... . - 566 | media (Paramphithoe). . ..... 3ll malleolus (Allorchestes) . . . . 582 | mediterranea (Orchestia) . . . . 53l malmgreni (Acanthostepheia) . . 254 | mediterranea (Örchestia). .. .. . 542 malmgreni (Acanthostephia) . . . . 254 ! mediterranea (Talitrus locusta forma) 525 malmgreni (Amphithonotus) . . . . 254 | medius (Allorchestes) . ...... 569 malmgreni (Amphithopsis) . . . . - ölö | medius (Pleustes) . ....... all malmgrenii (Acanthostepheia) . . . 254 | medusarum (Hyperia) ....... 512 malmgrenii (Oediceros) 254,254 | megacheir (Autonoe) ....... 596 malmgreni (Stenopleustes) . . . 3l6 | megacheir (Ischyrocerus) . . . . 659 mammillifera (Pallasiella) .. . . - 415 | megacheir (Lembos). . . .... 596 manophtalmus (Gammarus fluviatilis megacheir (Metopa) . .. ..... 197 EEE "2.2... 409 | megacheir (Parapleustes). .. . . . 817 mantis (Cheiroeratus) . ». » ... .» 419 | megacheir (Podoceropsis) 616, 659, 659 manudens (Amphilochus) . . . . 150 | megacheir (Podocerus) . . 658, 659 manuidens (Amphilochus) . .. . . 150 | megacheir (Stenothoe).. .... . . 197 margaritaceus (Gammarus) . . . . . 457 | megacheir (Sympleustes) .... . 317 margaritaceus (Odontogammarus) 457 | megacheles (Cheiriphotis).. . . . 737 marina (J,ysianassa) ..... 87,721 | megacheles (Melita). ....... 737 marina (Lysianassa) . ....... 719 | megacheles (Probolium) ..... . 194 marina (Stenothoe) . .. . . 198, 725 | megachir (Xenoclea). ....... 621 anarina (Urothoe) . x 2. ......:.180 | Megalonours . . . . :..2 2... 420 _ marina var. sinhalensis (Stenothoe) .. 725 | megalophthalma (Orchestia) . . . . 549 marinum (Probolium) ....... 198 | megalophthalma (Talorchestia) . 549 marinus (Gammarus) 387, 428, 473, 484, 505, | megalophthalmos (Orchestia) . . . . 549 5l4 | megalophthalmus (Atylus) .. .. . 363 marinus (Gammarus) . .. . . - 472 | megalophthalmus (Orchestia). . . . 549 marinus (Montagua). . . ..... 198 | megalophthalmus{Scamballa). . . . 549 marinus (Suleator) . ». »..... 130 | megaloprotopus (Amphithoe). . . . 633 marinus (Urothoe) ...... 130,132 | megaloprotopus (Ampithoe) . . . 633 marinus var. pectinatus (Urotho@) . . 130 | megalops (Apherusa) . .. . . . 306 marioni (Peltocoxa). ...... 160 | megalops (Aristias) .. ..:... öl marionis (Acontiostoma) . . . . 15 | megalops (Cerapus) . . .. 2... 673 marionis (Amphilochus).. . . 151,723 | megalops (Eriehthonius) . . . . . . 673 marionis (Amphithoe) .. . .... 515 | megalops (Eriethonius) . .. . . 673 marionis (Amphithonotus) . . . . . 515 | megalops (Halimedon). ...... 250 marionis (Pardalisca) .. .. . . 224 | megalops (Halirages) . . . . . . 293 marionis (Peltocoxa). . .. .».. 160 | megalops (Halirages) ....... 306 marmorata (Jassa) . .. 2...» 739 | megalops (Ischyrocerüs). . . . - 660 marmorata (Orchestia) . ... . 536 | megalops (Paramphithoe) . .. . ... 293 768 page megalops (Westwoodilla) . . . . 250 Megalorchestes . . . . »... 527, 549 Megalorchestia . ........ 527, 549 nn VRR . +. 420 Megaluropus ne rn 420 br tn. ER RE RE 430 Megamoera . ....... 430, 433, 441 Megamphopus: nr en 621 megapleon (Monoceulodes) . . . . . 238 megapleon (Perioculodes) . . . . 238 megnae (Mierodeutopus) . . . . . 592 meinerti (Hyalella) . . . ... . 579 meinertii (Thoelaos). . ...... 286 meinerti (Laothoe) . . ...... 286 meinerti (Laothoes) . . . . ... 286 melanophthalmus (Anonyx). . . . . 46 melanops (Amphilochus) . . 152, 723 melanops (Gammaropsis). . . . . » 618 DER: en ee a 421, 732 b 0.1 REES Er .. 798 Melphidippa : . . ».\. :. 835 BERN 337 Meiphidippells 7... 222°. 02L% 3837 Melphidippidae ..... 334, 728 WEHTMETBIOR EN en 48 Mesopleustes . er 315 messalina (Melita). . ..»...... 742 IURREHDOSUB.: 2 er le 138 DENODB TTS TE REN 7... 1072, 724 Ma EEE 182, 187, 193 MHOBEBR N 182 MESTOPIARO: ET 171 BERRRIRRE 3 6 ER EN 724 Bemporden. NEN 182 Metopdides: N. 185 meyerii (Dybowskia) . ... . 730 meyeri (Pallasea). . . . 2... 730 Mishchalan. "0 214 mierodentopa (Gossea). ». » » +.» 307 Mierodentonus: 2 an 588 Microdeuteropus . . 2». 2. 2%. 588 mierodeuteropus (Atylu) . ... . 364 mierodeutopa (Gossea). . » . .. .- 307 IMerodsutopie "u.a 588 Nywodentopne N: NE FR 600 WISFOTBBRRE NAHE TER RS EN 651 mieronyx (Cyphoearis) . . .. .. . 29 mierophthalma (Grubia). . . . - 738 micerophthalma (Pontoporeia) . . 127 mierophthalmus (Allorchestes) . . . 571 microphthalmus (Gammarus rhodoph- thalmus ar) ala 504 Mieroplax ...... ut 230 Mieroprotopus . ... »......604 mierops (Aristias) . - 7. ...2.%..49 mierops (Oediceros). . .» . . « 245, 246 mierops (Stenothoe) . . .... Alphabetical Index page mierura (Amphithoe) . . . 2... 489 MASTUTODUB 52. . 2 en 398 miersi (Anonyx) +. 2 2.....% 70 miersi (Elasmopus) . . . .. . . 446 miersi (Hippomedon) . ...... 75 mierst (Anonyx) .:. ....:424020.00% 75 miersii (Dexamine) . . ... .... 517 miersii (Meers) ; .::.°.°, 2.4. 29% 429 miersii (Megamoera) . » ..... 429 miersii (Montagua) . . . 2». .... 200 miersii (Montaguana) . . .».... 200 miersii (Paraceradocus) . . . . - 429 miersii (Probolium) . . . . » ee miersii (Stenothoe) . . . .... 200 miersi (Leucothoe) . . . .... 165 Ed 7°, 3 WE RE 446 miersi (Tmetonyx) . ......2 mihiwaka (Chiltonia) . - . .» . 555 mihiwaka (Hyalella) . ..... 555 mine (Oerapusy: > 5 4 5 7 2 671 minax (Eriehthonius) . .. .... 740 minax (Mierodeutopus) . . ».. .» 590 miniatus (Gammarus aheneus subvar.) 487 minikoi (Nototropis) Br, minikoi (Paratylus) . . ». 2... 728 minimus (Gammarus) . . 2... 513 minor (Hyale nilsoni var.). . . . . 566 minus (Gammarus) . . ..... 513 minuta (Cressa) . +... .... 192 mente (Dansia) 4... 00 192 minuta (Iphimedia) . . .. ...».- 213 minuta (Lysianassa). . . :.... 82 minuta (Orehomenella) . . . . - 82 minuta (Panoploea) . .....» 213 minuta (Stenothoe) . . . .»... 725 minutieornis (Ampelisea) . ... . 114 minuticornis (Byblis) . . .....» 114 minutum (Cyrtophium) . . . . . 698 minutum (Platophium) . . 2... 698 minutus (Adonyn) .. 82 minutus (Busirus) . ...... 342 minutus (Gammarus) . »..... 466 minutus (Gammarus pulex) . . . . 410 minutus (Ichnopus) . . 2.2 ....52 minutus (Ischyrocerus) . . . » . - 658 minutus (Microprotopus) 605 minutus (Niphargus) . . . .. . 410 minutus (Örchomene) . . ..... 82 minutus (Örchomenella) . » : ... 82 minutus (Podocerus) . „2... 655 mirabile (Lepidepeereum) . . . . . 80 mirabilis (Platyisehnopus) 123 mirabilis- (Platyschnopus) . . . . . 123 mirabilis (Weyprechtia) . . .. . » 381 mitsukurii (Amphithoe) . .. ... » 635 mitsukurii (Ampithoe) . .. . . 635 Moera-........ . MEER 433 a a Pi E 3 . E 7 [ 2 ; i Alphabetical Index page moggridgei (Amphithoe). . . » . . 387 malleri (Halimedon) ....... 250 monacantha (Dulichia) .. . . . 710 moniezi (Neoniphargus). . . - - 405 moniezi (Niphargus) -. » ..... 405 Monoeulodes . . .. 2... 258, 727 monoeuloides (Atylus). - -. .. - « 345 monoeuloides (Cancer (Gammarus)) . 196 monoculoides (Eusiroides) . . . 345 monoeculoides (Gammarus) . . » - . 196 - monoculoides (Montagua) . . . . . 196 monoeuloides (Probolium) . . . - . 196 monoculoides (Stenothoe) . . . . 196 monoculoides (Stenothoe) . 197,198, 200 Monoetulopsis.. .. Hi. are 257 monocuspis (Neopleustes) 313 monoeuspis (Paramphitho£) 313 monodon (Corophium) ..... 690 monodon (Ischyrocerus) 662 monodon (Podocerus) . » » » 2... 662 monstronn (Helay): „cn naiis venie 675 monstrosa (Helella) . -. ...... 675 monstrosa (Neohela) . . .... 675 monstrosa (Neohela) . . .» .... 676 Se 193 montagua (Iscoea) -. -». .»..:.... 630 ee ee 193 montagui (Isaea) . » »... - 630 montagui (Orchestia) . . ». .» - 533 montagui (Örchestia) . » »... - 542 montana (Orchestia) . . ... . 542; montanus (Gammarus). » » ... .» 410 montanus (Niphargus) . . . - - 404, 731 montanus (Niphargus) . .... 410 monticulosa (Eurymera) 357 morawitzii (Atylu) - » .. . „2... 397 morawitzii (Brandtia) . - . - .- . 397 morawitzii (Gammarus) . ». ».- .» 397 morrhuae (Ichthyomyzocus) 208 mortoni (Microdeuteropus) . . . - - 587 mortoni (Mierodeutopus) . » -.» » 587 mortoni (Niphargus) . .... . 731 muecronata (Harpinia). -. -. - - - 141 mucronatum (Corophium) . . . . 689 mueronatus (Amathilla) . ....% 506 mucronatus (Carinogammarus) 506, 734 mucronatus (Crangonyx) . . . . 388,731 muceronatus (Eucrangonyx) . 388,731 mucronatus (Gammaracanthus) . . . 506 mucronatus (Gammarus) . - . . - « 506 mucronatus (Siphonoecetes) . . - . 683 TE ee ar? , . mülleri (Halimedon) . . . .»... 250 multidentata (Megamoera) . . . . . 436 multifaseiatus (Gammarus)!. .. . . 742 multispinis (Iphimedia) . .. .. . 212 page muricatus (Oniseus) -. -. »-. .... 376 murinus (Echinogammarus) . . . 486 murinus (Gammarus) . » 2»... . 486 murmanica (Ambasia). . ... . 719 murrayi (Sophrosyne)‘. .. .. . 21 murrayi (Tryphosa). . . .... 720 musculosa (Orchomenopsis) . . . 84 museulosus (Anonyx) . » ».... 84 musculosus (Orchomene). . . . . . 84 mutatus (Gammarus) . » ».... 476 mutilus (Cancer (Gammarellus)) 493 mutilus (Echinogammarus) 493 mutilus (Gammarus) . ...... 493 a ER 618 Baus. CARABIRI I. 32 ee nana (Gammaropsis) . - -» 2... 616 I: Wane (HlarDinid) 2.0 a, 141 nana (Örchomenella) .. ..... 8l BABE CENORISN: 4a ei 738 nass (Iryphosa). ih sa 5% 70, 81 MARDORVE 4 re SE sr 34 nanoides (Anonyx) .» 2...... 71 nanoides (Ischyrocerus) . . . . . 657 nanoides (Podocerus) . » ». . . . 657 ‚nanoides (Tryphosa) . ..... 71 nanoides (Tryphosella) ...... nn nanseni (Pseudalibrotus) Pe 9. EB TARNORNEN 71, 81,87 nanus (Orchomenella). . ... . sl nanus (Tryphosa).-» »... » 8l Hardonis (Ananyx)..... 5.47% 86 nasuta (Boeckia) . -. . ». +. 39 nasuta (Lysianassa). -. =... 40 nasuta (Lysianax). - - » ». we nasuta (Metopa) .». » »- 0x. 182, 183 nasuta (Metopella) -. . ..... 182 nasutigenes (Metopa) . » » 2.2. 183 nasutigenes (Metopella) ....;:. .: 183 nasutigenes (Proboloides). . . . . - 183 natator (Gammarus) . » .... 463 neapolitanus (Amphilochus) . 150, 723 neglecta (Harpinia) . . . . 142,143,143 neglecta (Metopa) -. » 2»... .. 184 neglecta (Metopella) .... .. 184 neglectus (Aristias). .. .- - . 50 neglectus (Gammarus) . .. . 2. 474 nematocerus .(Gammarus leptocerus ne EEE RENTE FR, DIERBGRIBR 2. =. 7. 1. 2 inet 693 N RE U EB VER 556 RIED: ne ae 556 OT er 675 Neoniphargus ......% 404, 73] Neopleustes . . ». » 0. . 811,728 neozelanica (Allorchestes) . . . » . 581 neozelanica (Nicea) . .». ».....- 567 neozelanica (Pherusa) » . » .».. «= 294 Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 49 770 page neozelanieus (Oedicerus). . .» . . » 270 neozelanicus (Platyischnopus) . 123 nesaeoides (Nemertes). - » » ». - 693 neveu-lemairei (Hyalella) . . . . 786 newnesi (Oediceros) . » -» .. - 726 nieasense (Trischizostoma) . . 13,717 nicaeensis (Guerina). . - -»....- 13 nicaeensis (Guerinella) . ."... . 717 nieaeensis (Guerinia) . » 2...» .- 13 nicaeensis (Trischizostoma) . ... 13 Nasa REN ET 557,559 TIeraaypen. =. KERSEURE AUNE 8 225 nidrosiensis (Orchestia) -. -. » . . - 566 niger (Allorchestes) . - . . - - en } | niger (Pleuracanthus) .. . .».. .» 730 nigra XHyale) 2 nl 571 nigra IEALBROB) 42.0 730 nilsoni (Hyale). .. ..... 566, 568 nilsoni INIGBR) 18 +... 0. 0, 6 585 nilsoni var. major (Hyale) . ... . 566 nilsoni var. minor (Hyale). ... . 566 nilssoni (Halirages) . -. . . . . . 290 nilssoni (Hyale) . .... .» 566, 736 nilssonii (Allorchestes) . . » .. . 566 nilssonii (Amphithoe) . ...... 566 nilssonü (Hyale) . »....:.... 568 nilssoni var. kuriensis (Hyale) . . 736 Niphargoides :: :..: .-.. ..%.4°5% 450 Mäiphargus ». ai. ist 405, 731 Nivbamus s= 4 wu Saas} 472 nitens (Anonyx) - . .- - A 88 nüitens (Lysianassa) . -. ». .»... 88 Be (Melita) iz 424 zaäitida (Orchestia). -. . . ». ... 539 mitida (Podoceropsis) . - » . » . 620 nitidus (Podocerus) . . : .» » 2...» 620 nobile (Corophium) . . . ... . 687 RabNis. LAHnONyz) 7.2.0.0 iu nodifera (Acanthozone) -. . . .. . 316 nodifera (Amphithopsis) . . . . - . 816 nodifer (Stenopleustes) . . . . . 316 nodimana (Orchomenopsis) . . . 721 nodimanus (OÖrchomenopsis) . . . . 721 nodosa (Acanthosoma) . .» :»... 216 nodosa (Amphitoe) . 2. ..... 216 nodosa (Iphimedia) . . . .... 216 Hospia nn 5 NE a, R 618 nolens (Anonyx) » ».» 22...» 742 nolens (Gammarus) . . . RES, nordenskiöldii EREEERN RR | nordenskiöldii (Prinassus) . . . . . 522 nordlandica (Andania) . ..... 93 nordlandica (Andaniopsis) . -. . 9 nordlandica (Dulichia) . ... . nordlandieus (Atylus) . .. 2... nordlandieus (Nototropis). . . - nordlandieus (Paratylus). .. .. . Alphabetical Index page nordlandieus (Stegocephaloides) . . 93 nordmannii (Acanthonotus) . . . . 111 nordmanni (Ampelisca). . .. . 11l nordmannii (Protomedeia) . . . . . 742 NOriania 0 En 41 normani (Anonyx) . ». 2.2... 26 normani (Dulichia) . . . .... 711 normani (Euonyx) . :...... 19 normani (Iphimedia) . . .... 217 normani (Metopa) ....... 190 Nöormanion "aM 41,718 normani (Önesimus) . » » 2.2... 26 normani (Onisimus) . ......% normanni (Gammarella) . . .... 449 normanni (Liljeborgia) . ». » .. » 418 norvegica (Amphitho@) . ..... 307 norvegica (Bathyporeia) . . . .. . 120 norvegica (Calliope) - ».».... 307 norvegica (Leucothoe) ...... 177 norvegica (Metopa) . . ..... 177 norvegica (Montagua) . . . . . 177,178 norvegica (Paramphithoe) . .. . . 307 norvegica (Podoprionella). ... 17 norvegica (Urothoe). . .. . . 131,132 norvegieus (Anonyx) .». » 2»... 74 norvegicus (Calliopius). - » ».». . 307 norvegieus (Monoculodes) . .» . - . 264 norvegicus (Monoculodes). . . . 265 norvegieus (Oedicerus). . . . . 241,265 norvegieus (Pontocrates) . . . . 240,241 INototropis 272: 329, 728 Notzotopis - 2 SE RER 329 novaehollandiae (Leueotho£) . 169 novaehollandiae (Paraleucothoe) . 169 novaehollandiae (Talorchestia) 5583 novaezealandiae (Allorchestes) . . . 581 novaezealandiae (Hyale) . . . .. 567 novaezealandiae (Leptamphopus) 294 novaezealandiae (Nicea) . ... . - 567 novaezealandiae (Oedicerus) . . 270,297 novaezealandiae (Orchestia) . . . 542 novaezealandiae (Pherusa) . . . ... 294 novizealandiae (Allorchestes) . 581 novi-zealandiae (Oedicerus) . 270 novizealandiae (Orchestia (Talitrus)) . 547 novizealandiae (Örchestoidea) . . . 547 novizealandiae (Talitrus). . . » . . 547 nubilatus (Monoeulodes) . . . » . - 246 nubilatus (Oediceros) 261, 262, 264, 264, 265, 265, 266, 266 nudicornis (Hyale) .. ..... 573: nudicornis (Nicea). . » -» - »... 573. nugax (Anonyx) ..... 54,719, 721 nugax (Anonyx) . 54, 55, 55, 66, 75 nugax (Cancer)... . . . er EEE RE nugax (Gammarus) . » ..... 54, 56 nugax (Ichnopus) . ..». .. . » 48, 52, 57 u # a HB a se Sl ae Te oe U re ee EEE EEE ELEND Alphabetical Index page nugax (Lysianassa) » » 2... 56 nugax (Talitrus) . ..-..... 54 nugax (Tryphosa) .. ...... 720 obesa (Charcotia) - - . -» ...» . 718 obesa (Iphimedia) . . . - - 213, 213, 217 obesa (Iphimedia). . . .». .» .» - 214 obesum (Aeidostoma) . . -» » . - 14 obesum (Aeidostoma) . .» ..... 14 obesus (Anonyx) . » 2.2... 14 obesus (Gammarus). . ..... 464 ob8aBu8 (Katlue)...2:,. 00 721 obtusa (Orchomenopsis) . . . - - 85 obtusa (Polyeheria) .. . ».... 520 obtusata (Amphithoe) . . . .».. - 426 obtusata (Melita) . - ». »..:.-. 426 obtusata (Melita) . .. . . 426, 427, 428 obtusatus (Cancer (Gammarus)) . . - 426 obtusatus (Gammarus). - » .»... 426 obtusifrons (AnonyxX) . » ... - » 48 obtusifrons (Bathymedon). . . . 256 obtusifrons (Halimedon) . . . . . .» 256 obtusifrons (Harpinia) ... - - 143 obtusifrons (Menigrates). -. - - » 48 obtusunguis (Gammarus) . . . . 426,449 obtusus (Anonyx). .... +... 85 obtusus (Oediceros) . . - » »...» 248 obtusus (Oedicerus) .. . -»... - 248 obtusus (Phoxocephalus) . . . . 136 allaue (Ehaxas) - : zu. 2 sh 136 oceidentalis (Amphithonötus). . . . 311 occidentalis (Pleustes) . . . . . 8ll ochotensis (Allorchestes) . . . . . . 561 ochotensis (Echinogammarus) . . 484 ochotensis (Gammarus) . . .».. . 484 ochotensis (Hyale) . . ..... 561 ochotensis (Orchestia) . . . 543 oeis (Bruzeliella) . ........ 739 Baus: GJABBEN: ae 655, 739 oeius (Podocerus). . » .». . - 653, 655 oculata (Rhachotropis) . . . . - 350 Öeulats (Tritropis) +... #0 350 oculatus (Amphilochus) . . . . . 152 oculatus (Paraphoxus) . ... . 137 oculatus (Phoxocephalus) . . . . . 137 oeulatus (Phoxus). .. ... 2... 137 ar ee 210 Odontogammarus . . :: 2... 456 odontonyx (Amphilochoides) . . . . 152 odontonyx (Amphilochoides) 153 odontonyx (Amphilochus) . . . . . 153 odontonyx (Podocerus) . . . . . . 658 odontoplax (Ampelisca) . .. . - 103 a ET 5 FT er 235 a Re 235 Ne VE Pe RER 235 BERISEINSE 2 nee 235 N er 267 771 paga WOHMGEFODBIS +. 0. 1 ae 252 BBBISOEOH - 2. ee dee . 243, 726 Oedicerotidae ........., 235 a EEE 243 olivaceus (Gammarus viridis var.). . 484 GUYE (dammarus) .... 2. 5... 22%, 472 olriki (Amphithopsis) .. ..... 319 olrikii (Amphithopsis) . . . ... . 319 | olrikii (Sympleustes) . . .... 319 Ommatogammarus: . „7... 454 onesiensis (Niphargus puteanus var.) .. 406 ONESIMOIGBR 4... 42: en, a :} RE Sr re 25,33 ongureni (Dybowskia armata var.) 735 I EL 1 Onlsimuasr. 22 Wera N TRATEN 25 N EN re 33 a 20 ER a NE 20 EHBARTOR: 2 2 02 Se ee ae 727 RE Be ee 530, 799 orchestes (Gammarus) . . . ... . 478 orchestes (Poekilogammarus) . . 478 N N ER WE RE 530, 735 BRRREBI TARGA r 523 BROHESEIOD Eu. 523 orchestiformis (Gammarella) . . . . 449 Orchastildae 2... 0. 2 523 orchestiipes (Ceradocus) 432 orchestiipes (Maera) . . ...... 432 orchestipes (Megamoera). . . . . . 432: orchestipes (Melita).. ..... . . 432- @#chestoldes. au. Nr, 527 RE RE 44° 34, 78,81 DESBOMeNe, 2. 44 Orehomenalla 7.2..2:2.27 3 67,68 Orchomenella . ... .2..7.272% 81, 720 orchomenipes (Eusiroides) . . 729 Orchomenopsis . - . ..... 83, 721 oreinus (Gammarus). -. -...... 408 oreinus (Niphargus). .. .... 408 orguion (Paradryope) . ..... 602 orientale (Cratophium). . . ... . 657 orientale (Cyrtophium) . . . . . 698 orientale (Platophium) 698, 702,703, 705,706 .orientalis (Allorchestes) . . . . » . 573 orientalis (Amphithoe). . . . .. . 641 orientalis (Ampithoe) . . . . . . 641 orientalis (Gammarus) . . - .. . » 657 orientalis (Hyale) . . . ..... 573 orientalis (Jassa) -. ». ». . 2.2.» 657 orientalis (Podocerus) . . ».. . » 657 orientalis (Siphonoecetes) . . . . 740 orientalis (Synopia) . -. .». .»».. 273 ornata (Acanthostepheia) . . . . . 270 ornata (Cyproidea) . . ..... 158 772 page ornata (Öyproidia) .... 2... 158 orrats WRABBO): RE ar 657 ornata (Oediceroides) . » . .. » - 270 ornata (Orchestia).. . . . - re | ornatus (Gammarus). ». 2»... .. 476 ornatus (Halimedon) . ...... 270 ornatus (Ichthyomyzocus) . . . .- - 742 ornatus (Oediceroides) . . . . . 270 ornatus (Podocerus). . » - 2»... - 657 ornatus (Talitrus). .» 2... 4 527 Orthopslame : in 3 Nr 604 osborni (Polycharia). . . ... - . 520 osborni (Polycheria) . ...... 520 ossiani (Balliope).., u. 0. ).% 817 ossiani (Calliopius) . » » 2... 317 ostroumowi (Eurystheus) . . . . 614 ostroumowi (Protomedeia) . . . . » 614 otakensis (Cyproidea). . . .. » 723 otakensis (Cyproidia) . » .»....- 723 othonides (Maera). . ...... 132 othonis (Gammarus). . .». » ....- 438 othonis (Maera). . . » ».2.2.%. 438 othonis (Megamoera) . . .»..... 439 TREE AT ET ee 210 ovalipes (Apherusa). . . .... 1727 GEE TEOLINBN no. er tan 707 ovalis (Socarnes) . » . x...» 56 aaa (Metopa). - 1. 19% 222855 183 ovata (Metopella) . . .:» 2... 183 ovatus (Metopoides). . » » »..» . 183 oweniüi (Acanthonotus). » » .» - . - 323 oxyura (Melita):. 21... 2% R.2392% 429 pachycera (Leucothoe) . . . . -» 164 "pachytus (Atylus). .........:00% 404 pachytus (Gammarus) . . ..... 404 pachytus (Micruropus) . . . .» » 404 pachytus var. dilatatus (Gammarus). 404 pacifica (Dexamine). . . »..»... 518 pacifica (Iphimedia). . . .» ... 215 pacifica (Paradexamine). . .. . 518 pacifiea (Paramphithoe) . . .. . . 728 pacificus (Neopleustes) . . .. . 728 packardii (Orangonyx). - » .... 389 packardii (Eucrangonyx) 389 packardi (Monoculodes) . . . . . 266 Pausndras N SE 202 REDABeR 23.2 av. a 374, 750 Bi 1a. 1 TERRA ENTER 374 Palsstells BRETT REN 374 pallida (Liljeborgia). . . . .. . 230 pallida (Liljeborgia) . »... 2... 23l pallida (Lilljeborgia) . ». 2... 281 pallida (Melita).. „NEE 422 pallida (Nieippe) . . .. . 232, 232, 234 pallidus (Anonyx). ....... 86 pallidus (Concholestes) . . . 2... 742 pallidus (Gammarus) . .... 230, 232 Alphabetical Index page pallidus (Monoculodes) . . . . . 261 pallidus (Siphonoecetes). . . . . 683 palmata (Gammaropsis) . » x.» » 616 palmata (Melita) . 422, 424, 427, 429, 505 palmata (Melita) . . . : 2... 425 palmata (Metopa) . ... . . . 174,724 palmata (Metopina) . . ».» 2... 724 palmata (Podoceropsis) - » » » .» - 616 palmata (Sthenometopa) . » . . » » 724 palmatus (Astaeus) . . » 2.2... 425 palmatus (Cancer). . ». . 2.2... 425 palmatus (Burystheus) . . .. -» 616 palmatus (Gammarus) . . . 2... 425 palmatus (Podoceropsis) . . .» . » - 616 palmeta (Melita) ... » 2... 425 palustris (Orchestia). . . -».... 540 Pinttara , RE TER 448 PURBBriteB 2. RER 448 panopla (Acanthozone) . . . . 310,311 panopla (Amphithoe) . . .».... 310 panopla (Amphitoe). . ..» 2...» 310 Poboplass EEE . 211 panopla (Paramphithoe) . . . . 310,311 panopla (Pleustes) ...... 310, 311 Panopldea u. re. ee ER Pohoploea . EN ET 293 panoploides (Amphithoe) . . .. - all panoplus (Pleustes) . . . . . ..» 310 panoplus (Pleustes) . . .». » 2... 311 papyracea (Syrrhoe) ...... 283 Paraoalliode: 2. ES BRITEN 2397 Paracalisoma.:. Ay RN 719 Paraceradoeus Va NER RER 429 Päarseorophium 7; TREFF IREER 663 Paracrangonyz ..:. DREIER 369 Paracyphocaris- Wr ES 717 Paraeyproidea .... an u 160 Paradexamine .. PT 518 ZEESRHE: REN 602 Persäulichie , YORE 713 Poragrubis m. N Ba Nr 739 Porajassa u ERENN 649 Paraleptamphopus . . . . .» 3 294 Paralencothoe „3 EEE parallelocheir (Metopa) . a 186 parallelocheir (Metopoides) . 186 Parambasia . EI TR Parsniara TRENNEN 368 Parametope..: NT ER 725 Paramieruropus. . . ... ER... Pasampvera u... wm es 368 PRRRDORE EEE TAI 421, 423 Paramphithoe . 295, 296, 304, 309, 311, 329 Paramphithoe. ...... : . 324 Paramphithoidae ..... ° 309 Paramphithoidae . ..... 320 Paranaenia. .. . . EIER J 3 A ee il mh 0 4 ne Dan Li? al a mi u en ae WITT FRE aa ö Ber te A LE aa rl m Kl rd u u ae ann = RT u Bu a ‚peetinatus (Anonyx). - ..... 45, 46 Alphabetical Index 773 page page Parandania . ..2 2, ss 95 | peetinatus (Leptocheirus) . . . . 629 Parapallasea ... . - .» . . 497,753 | pectinatus (Metaphoxus) . . . . 139 Parapheruss .. . u... 1%. 383 | peetinatus (Örchomene) . ..»... 45 Paraphoxus. ........ 137,723 | pectinatus (Phoxocephalus). . . . . 139 SRmmplouslen » ats an as 319 | peetinatus (Ptilocheirus) . . . . . . 629 PS EN RE 320 | pectinatus (Stegocephaloides). . . . 9 ET Re 40 | peetinatus (Stegocephalus) ... .. 9 parasitica (Acanthosoma) . . : . . 821 | pectinatus (Urotho& marinus var.). . 130 parasitica (Amphithoe) . .... . 321 | pectinierus (Moera) . ....... 445 parasitica (Epimeria) . . ... . 821 | peeulans (Amphitoe) . ...... 674 parasiticum (Cyrtophium) . . . . . 699 | peculans (Eriethonius) .... . . 674 parasiticum (Platophium) 699, 702,704 | pelagica (Ampelisca) . . . . 111,722 parasiticus(Acanthogammarus)511,735 | pelagiea (Ampelisca) . . . .. al parasiticus (Acanthonotus) . . . . - 321 | pelagica (Amphithoe) : ...... 645 parasiticus (Ceradoeus) . ..... 511 | pelagica (Amphitoe). ....... 645 parasiticus (Gammarus) : .... . 511 | pelagica (Bathyporeia) . ... . 120 ' parasiticus (Leipsuropus) . . . . 699 | pelagica (Jassa). . »..... 649, 656 parasiticus (Polyacanthus) . . . . . 735 | pelagica (Parajassa). . ..... 649 Zurauyphosites. . . : . . 2. 42 | pelagica (Sunamphithoe). . ... . 739 829 | pelagica (Sunamphitoe) . . . 645,739 EEE a EL TRER FIRE -.:281 | pelagiea (Thessites). . - . .... 120 AR 224 | pelagieus (Cerapus) . » .» 2... 742 Nr A EP 227 | pelagieus (Podocerus) . . » .». .. . 654 zaräsliscidae . 2... 03: 220 | pelagicus (Pseudophthalmus) . . 111, 721 Bardaliscinae:... 0; sack 220 | pellueida (Melita) . . - ..... 424 Paraslnonlden’:, Cr 224 | peloponnesiacus (Gammarus) . . . . 513 Bar6läsmopus,. 2 417,732 | peloponnesius (Gammarus) . . . 513 RP, sen a 900 147 | peltata (Stenothoe) . . ..... 194 BrarBunlor 22, ae or 0 A 157 Parosedioceron . ı. „2.2, DIET EBERBOER 2 2: 2 EN 159 en) Ve EEE: 43 | penieillata (Allorchestes) ... . .. . 585 en RE BE ee GR SER RER 21 | penieillata (Amphithoe) . ..... 639 Bevarcheatia. 2:2, 947 ,7.2..084.% 557 | penicillatus (Allorchestes) . . . . 585 parvexii (Echinogammarus) . . . 493 | Pephredo . . .. : 22... 715 parvexii (Gammarus) . . . 2... 493 | pepinii (Acontiostoma) . .» .... 16 parvimana (Melita) . . ..... 732 | pepinii (Stomacontion) . . . . . 16 parvimanus (Halimedon). . . . . . 250 | peregrina (Amphithoe). . . ... 637 parvimanus (Oediceros) . .. .. . N. Peeblonoims. : 2. eye 201 parvispinosa (Orchestia) . . . . 541 | ‘pereiri (Allorchestes) . . . . . 565, 570 parvus (Pleustes) . - -....... 742 | perieri (Allorchestes) -. . -» . .. . 570 patagonicus (Allorchestes) . . . 585 | perieri (Hyale) . .. ...... 570 paulensis (Allorchestes). . . . - 685 }: peren (Nivea)... 1 en 570 paurodactylus (Cardenio) . . . . 126 | perieri (Örchestia). . -» » 2... . 570 paurodactylus (Cardenis). . -» » . . 126 | perieri var. breyicornis (Nicea) . . . 570 pausilipae (Amphithoe) .. ... . 641 | perieri var. pontica (Nicea) . . . . 570 pausilipae (Ampithoe). .. . .. . 641 | Perioculodes . . ..»..... 237, 726 pausilipii (Amphitoe) . ...... BL I perla (Alylas) =... 2.2000 403 pausilippii (Amphithoe) . .... . 641 | perla (Gammarus). .. .. 2... 403 pausylipi (Amphithoe). . .. .. . 641 | perla (Mieruropus) . ». ..... 403 pauxillus (Gammarus). . . .. . 469 | pernix (Allorchestes) . . .... - 736 peetenierus (Moera) . . 2. .... 443 | pernix (Hyalella) .. .. . a peetinata (Andania). ....... BB 4 Parrierella . „a... 2.002 % 40 pectinata (Andaniella). . .... 93 | perrieri (Stenothoides) . . . - - 1725 pectinata (Harpinia). . .. . . . 142 | persetosus (Elasmopus) . .... - 441 pectinata (Orchomene) . . . . . 45 | peruviana (Allorchestes) . .. .. - 566 peetinata (Protomedeia) . . . .. . . 629 | peruviana (Amphithoe) . ..-.. 446 peruvianus (Elasmopus).. . . . » 446 774 page peruvianus (Gammarus) .. .... 446 peruviensis (Megamoera).. . . 446 petalocera (Glauconome) . . . .. . 681 petalocera (Lysianella) . . . . . 3l petalocera (Unciola) . ..... 681 petalocerus (Anonyx) . » .».... 32 petersii (Echinogammarus) 491 petersii (Gammarus) . . . . . 2... 491 polrial (Moers) =. 00 a 441 Dhasdra ur ne 727 phasma (Neohela). . . ..... 676 PHOFRER 42.0 son en ae 449 philacantha (Autonoe). . ..... 598 philacantha (Lembos) . .»: . . .» . 598 philacanthus (Lembos) . . ... 598 BPRIPDNA 0. ae De 89 SRUSGIABB. .. . 2... Grant 200 FRLSDUUGSB. 2... 200 a TE A 200 Photidap.. an... 603, 737 en ET 605, 738 PROXKGaR, 2... uwaln.E Bl 133 a ee T WR 133 FROKkIuR er at en 133 TE, Re 133 Phozxocephalidae .n:....2% 133 Thoxocephalus :: 3. 2.2.2:2% 134 Phoxocenhales . .. .„. su.:3..; 145, 147 a OT 134, 140 Phreatogammarus. . . ..».. 453 phyllonyx (Aceros) . ....... 248 phyllonyx (Arrhis) . ...... 248 phyllonyx (Halimedon) ...... 248 phyllonyx (Leueothoe). . . . . ._- 248 phyllonyx (Montagua) . ...... 248 pickeringii (Orchestia) . . -. - . 588 pickeringi (Orchestia) ... ... . 538 picta (Amphithoe) ......... 639 piece Aaunela) vn usa 235 pieta (Lilljebörgia) . ..:.. .. 235 pietus (Calliopius). . ...... 297 pietus (Gammarus) 478, 478, 478, 479 pietus (Parapleustes) . .. .... 297 pietus (Poekilogammarus) . . . . 478 piedmontensis (Allorchestes) . . . 573 piedmontensis (Hyale) . .. . . 573 piedmontensis (Hyale (Allorchestes)) 573 pilicornis (Lysianassa) . .... 40 pilosa (Bathyporea) ... .. ... 120 pilosa (Bathyporeia) 120, 120, 121, 121,122 pilosa (Bathyporeia) . ...... 121 pilosus (Gammarus (Maera)) . . . . 423 pilosus (Leptocheirus) . . . 628, 628, 629 pilosus (Leptocheirus) . . ... . 630 pinguides (Orchomenella) . . . . 721 pinguis (Amathia) . .........»% 382 pinguis (Amathilla) . ... ....% 382 Alphabetical Index page pinguis (Auonya) . .:. ern 82 pinguis (Harpinie) :. .... „8 a 146 pinguis (Leptocheirus) 627, 738 pinguis (Orchomenella) . .. . . 82 pinguis (Pontharpinia) . .. . . 146 pinguis (Protomedeia) . . . . . . . 627 pinguis (Ptilocheirus) . . . . . 627, 738 Dinpals (Eryphosa) =... 90.05 82 Dinguie I1]rothob) .. 2... 0 2 146 pinguis (Weyprechtia). . ... . 382 pingvis (Amathilla) . .. . ..... 382 pingvis (Gammarus). ... . SE. | pingvis (Örchomene). . 2». 2... 82 pingvis (Örchomenella) . . .... 82 plaeidus (Gammarus) . . .... 470 planifrons (Laphystiopsis) . . . 210 planipes (Glaueonome). . ..... 681 planipes (Uneciola). . ...... 679 Blaksmon: „5.270. names 58 plateaui elongatus (Niphargus) . . . 731 plateaui (Niphargus) . . : .. . 731 plateaui robustus (Niphargus) 731 platensis (Orchestia) . . . . .» .- 540 platichelis (Talitrus) . . . . .... 525 Plsiophinme 2 700 platyceras (Onesimus) . . » .».. 34 platyceras (Pseudalibrotus) . . . 54 platycereus (Gammarus wahlii var.) . 402 platycheir (Gammarus) . . . . . 471 platycheles (Talitrus) .. - .. - - 525 Platyischnopus .: ..,0...5% 122, 722 platynotus (Sancho) . . . ... . 288 Platyachnopns : 2... , 9% 122 plauta (Lysianassa) . ».. -»... 26 plautus (Anonyx) . .:. . 0% 26, 26, 87 plautus (Onesimus) . . »..... 26 plautus (Onisimus) . . . ...». 26 TUOONEKRR 2. a 642, 738 Plesiogammarus 2.3 446 Pionracaniäus : .. 3:0 „un 730, 733 Ploustee u. 2 en 309 Pleustidas: vr ne 8 309 Pleustinae ..... EA 309 Piazaura .. 2. 4:0. 0 OO plumicornis (Allorchestes) 583 plumieornis (Gammarus) . . .» . . . 742 plumicornis (Nicea) . ». ». .. +. - 583 plumosa (Autonoe) . . . ».. . 597 plumosa (Haplocheira). . ». . . . » 609. plumosa (Harpina) ........ 144 plumosa (Harpinia) . -. ».... 143 plumosa (Harpinia) . . .- ». - 144 plumosa (Lysianassa) . ». .... 38 plumosus (Phoxus) . . . . . . 148,144 plumulosus (Allorchestes) . . - 585 poeillimanus (Elasmopus).. . . . 443 poeillimanus (Maera) . . ..».. 443 E- 3 3 | ; ia page poeillimanus (Moera) . »..... 443 modager (Melite)" 4-8. 742 Podoceridse >. ... 0... 694 podoceroides (Amphithoe) . . . . - 639 podoceroides (Lembos) . . . . . 737 podoceroides (Pandorites) . . . . 448 podoceroides (Sunamphithoe). . . . 639 ENCEFODRIR: 5 nee na 618 EOROBOTOBNN Se een 621 N 2 ee Ce 802 a a 428 BSIDCHFNE: ee 700, 741 BORODHMan >. = se 18 Podoprionella .2.°.22.2 22%:..; 17 ee re 742 podura (Amphithoe) . .»...... 513 Dogors (Pheruss) . . 22. ..2.% . 513 podurus (Cancer (Gammarellus)) 513 podurus (Gammarus) . . ... . 513 poeeilurus (Gammarus) . » ... . 472 2o6ekllogammarußs.." 2. 2,2... i. 477 Bonus (ABOByE) ... 512 0 86 pollexiana (Metopa). . - .»..... 177 pollexiana (Montagua) . ..... 177 pollexiana (Stenothoe) ..... . 177 ‘ pollexianum (Probolium) . .... 177 pollexianus (Montagua) . » .... 177 RE 5 11 27) Bee a 607 pollieifera (Orchestia) . -. . .. . . 550 pollieifera (Talorchestia) . . . . 550 poloniea (Goplana) . ....... 369 polonica (Synurella). . .. . 369 polyacantha (Acanthozone) . . . . . 325 polyacantha (Paramphithoe) 325: ER Ur Pe a 734 polyarthrus (Echinogammarus) . 495 polyarthrus (Gammarus longicornis BR eg ns 493 a ee a 519 N A EN 519 ee 519, 735 lu) ter Ge PER 3%. polyprion (Probolium) . . . . . 194,195 polyprion (Stenothoe) . . .»... . .. 194 pompeü (Eusiroides) -. .»...... 845 pomposus (Onesimus) . » 2»... . 34 Pontharpilar... 2 2, 5 145 pontica (Amphithoe vaillantii var.) . 639 pontiea (Amphitoe) . .... .. . 568 pontica (Cerapus macrodactylus var.) 673 pontiea (Chelura) . . -...... 693 pontica (Dexamine spiniventris var.) 515 pontica (Hyale) . 561,568, 569, 574, 574, 581, 584 2onWoR Aiyaler 2... 2 568 pontica (Nicea). . .. . BE | pontica (Nicea perieri var.) . . . . Alphabetical Index 775 page ponties: (Pherusa) .: 4... 1.2.24, 4 306 pontieus (Niphargus) . . . .. . 410 ne De 127 POBLOCFBIBB.: 0... u 239 Pontoerätent . 2 2 2 2 waren 241 POntogonels; - east ra 359 Pontogeneia . ...... 308, 347, 394 Pontogeneiidae ....... 356 N er 359 PORtODOrBlar 2 Senat 127 Ponfopereiidse: .. . .u..0u.5% 118 HORBDBOHBG a Te 127 porreceta (Dulichia) . . . .... 712 porrecta (Dulichie) . . ..... . 712 porreetus (Dyopedos) . . .».... 712 poseidonis (Urothoe) . . . ... 122 potamogeti (Pephredo) . . . . . 715 poucheti (Urothoe) . .... . 131, 722 praedator (Paracyphocaris) . . . 717 pravidactyla (Talorchestia) 546 prevosti (Allorchestes) . . ... . 565 Deavosli (Biyvalo). 22.04.14 4025 736 prevostii (Amphithoe). . . ... .- 565 prevostii (Hyale) . 564, 564, 565, 566, 567, 567, 570, 570, 571, 572, 572, 572, 572, 572, 572, 573, 578, 573, 578, 573, 573, 574, 581, 581, 583, 584, 584, 584, 585, 585, 585, 585, 585 prevostii (Hyale) ...... 565, 736 prevöstii (Niees) . v.. . .:.. 565, 570 N Re 521 ET PL 126 Prischline ...u.2.20.02%% 126 a 192 Proboloides. 2. 2.4, u 187, 725 Proböleides 55 °2.420,.3,773. 03 182 procera (Leucothoe) . ...... 165 producta (Lysianassa) . - » » » .» 66 products. (Photis) : . . :. produetus (Centromedon) . . . . 66 produetus (Dereothoe) . . ... . 609 propinqua (Ampelisca) ...... 102 propingua (Harpinia) . . .... 143 propingua (Metopa). . ..... 174 propinguus (Eusirus) . . .. . .» 340 propinguus (Gammarus) 733 propinquus (Hippomedon) . .. . . 59 propinguus (Micerodeutopus). . . 592 propinquus (Oediceros) . . » . . » 246 propinguus (Paroediceros) BE propinqva (Ampelisca). . » ... . 100 propingva (Harpinia) . ...... 143 propingva (Metopa). ..... . EE propingvus (Eusirus) . ». » .».. . 340 propingvus (Hippomedon) . .. 59 propingvus (Mierodeutopus) 592 propinqvus (Paroediceros) . . ,„ » .„ 246 776 page Prostomatas... „us unuieiare Sr 5 Prostomatldae sin ir n/a} 3365 8 Protomiedaia* 8.0 an el 615, 616 Protomedeia. . . . .....»» 623, 738 pröxima (Melita). . . . ». ...2 426 proxima (Oediceroides) . » » .» - 269 proxima (Orchomenopsis) . . . 72] proximus (Oediceroides) . . . . 269 uesieylis 58.30 a 716 Pusudslbrotus '.. cr 5:.2 2.0 983 25 Pseudalibrotus . . :...%.» 33, 718 Pseudoniphargus . . . ..... 729 Pseudophthalmus . ». ». 2...» 98 Proudotiron rl 22 0% 284 Pseudotryphosa . . 1». Wu ia 63 BISFSEOCBPB, ce ara 124,125 Piorygocefus:.. ee 124, 125 Eaipehelfos: 0. 625 pubescens (Amphithoe) . .... . 440 pubescens (Elasmopus) . » .».. - 440 pubescens (Gammarella) ..... . 440 pubescens (Gammarus). . » .»..» 440 pubescens (Maera) . . ..... 440 Daella (Ati) > 5 399 puella (Gammarus) . . ...».... 399 puella (Mieruropus). . . .... 399 pugetensis (Gammarus) . . . .. 234 pugetica (Ampelisca) ...... 111 pugeticus (Ampelisca) .. ». ... -» 111 pugettensis (Allorchestes) . . . . - 573 pugettensis (Gammarus) . . . . 234,726 pugettensis (Grayia). . . .»....- 742 pugettensis (Hyale). ...... 573 pugettensis (Iphimedia) . . . . . » 728 pugettensis (Liljeborgia) . . 234,726 pugettensis (Neopleustes) . . . . 728 pugettensis (Örchestia) .. ... - 529 pugettensis (OÖrchestia (Talitrus)) . . 529 pugettensis (Orchestoidea) 529 pugettensis (Paramphithoe) 728 pugnax. (Cerapus). » . . 2.2...» 672 pugnax (Eriehthonius). . » .».. . 672 pugnax (Eriethonius) .. .... 672 pugnax .(Pyctälus) 03. 2,52% 672 pulchella (Acanthozone) 311, 312, 312, 313, 314, 318, 320 pulchella (Amaryllis) . . .... 24 pulchella (Amphithopsis) . ... . 319 pulchella (Amphitoe) .. ..... 312 pulchella (Egidie) u... 28 130 pulchella (Jassa) . . .... 654, 739 pulchella (Paramphithoe) .. .. . 312 pulchella (Pherusa) ........ 312 pulchella (Urothoe) . .. .... 130 pulchellus (Amaryllis) .. ..... 24 pulchellus (Carinogammarus) . . 508 pulchellus (Gammarus) ...... 503 Alphabetical Index page pulchellus (Neopleustes) . . . . 312 pulchellus (Niphargus) . . . .. 731 pulchellus (Parapleustes). . . . . . 319 pulchellus (Pleustes) . . .. - 312, 312 pulchellus (Podocerus). . . - . . . 654 pulchellus (Sympleustes) Rn, pulchra (Acanthostepheia) 254, 726 pulchra (Ambasia) . .. . . 52,719 pulchra (Schisturella) . . . . .. 719 pulchra (Tryphosa) . --..... 52 pulchridentata (Iphimedia) . . . 215 yulexz KAstscus). -.. 2:2... ... 474 pulex (Dander). . x. 2... 8 458, 474 pulex (Cancer (Gammarellus)) . . . 474 pulex (Cancer (Gammarus)) 474 pulex (Gammarus) . . ....» 474 pulex (Gammarus) . »..... 476, 506 pulex minutus (Gammarus). . .. » 410 pulex (Oniscus). ..». 2 .... 458, 476 palex (Samills) u.a 474 pulieiformis (Oedicerus) . »... - 742 pullns (Atylos).. 0, 20.8 88 208 416 pullus (Baikalogammarus). . . . 416 pullus (Gammarus) . .». 22.2... 416 pumilus (Anonyx). ». »..».. 0...» 66 pumilus (Centromedon) . . . . . 66 punetata (Amphithoe) . . . . . 642, 643 punetata (Amphitoe) ... . » ee punctata (Ampithoe) . . . .. . 642 punetata (Autonoe) . . .»....» 587 punetata (Callisoma) ....... 40 punctata (Emone) . ... 2.2...» 742 punctata (Lysianassa). . ... 40 punetatum (Callisoma). . -..»... - 40 punctatus (Anonyx). . »..... 86 punetatus (Cerapus) . . » 2... 672 punctatus (Dercothoe). . . ... . 672 punetatus (Gammarus). . . - - 449,639 punetatus. (leilius). .:4. .. 0... 707 punctatus (Lysianax) . -. 2... 40 punetatus (Podocerus). . .» » ..» .» 672 punctimanus (Gammarus) . . .». - 449 pungens (Gammarus) . 400,410, 462, 481, 482, 483, 483, 484, 494, 495 pungens (Gammarus) . ..... 471 pungens (Gammarus (Niphargus)).. . 472 pungens (Niphargus) . . -» .».. 472 purpurascens (Gammarus) . . .. 733 purpuratus (Gammarus) . . ». . . 427 purus (Laetmatophilus) . . . . - 696 pusilla (Amathillina) . ..... 500 pusilla (Ampelisca) . . . . ....105 pusilla (Bruzeliella) ........ 739 pusilla (Colomastix) . . ».» » 206, 207 pusilla (Colomastix). -. . » . .... 207 pusilla (Gmelina) . . ....... 414 Dusilla :@a8sa) 25 Sr 655, 739 Fi I 3 ker Sc A ee u ne a Zn a ee Zur ee ee N at: page pusilla (Metopa) . » ..».:.. 179 pusilla (Tryphosa) . » . . . - 470 pusillus (Amphilochoides) . . - - » 153 pusillus (Anonyx (Tryphosa)). . . . 70 pusillus (Cratippus) . « » ».... 207 pusillus (Podocerus). . ». » ».. - 655 puteanus (Gammarus)405, 406,407, 409, 409 puteanus (Niphargus) . . - . . » 407 puteanus var. forelii (Gammarus) . . 406 puteanus var. forelii (Niphargus) . . 406 puteanus var. forellii (Niphargus) . . 406 puteanus var. onesiensis (Niphargus) 406 puteanus var. vejdovskyi (Niphargus) 407 puzyllii (Ceradoeus) . . . . 498 puzyllii (Gammarus). . ». » - . . .» 498 puzyllii (Parapallasea) . . - 498, 734 puzyllii (Pleuracanthus) . .... - 734 Sn A U 670 pygmaea (Amphithoe) . . ..... 607 quadrangula (Metopa). . . . . . 724 quadriceps (Corophium). . . . . 692 quadricuspis (Cleippides) . . . . 301 quadridentata (Acanthozone) . . 292, 303 quadridentatus (Halirages) . . 292 quadrifidus (Talitrus) . . . . . . - 549 quadrimana (Ampithoe) . .. . . 635 quadrimana (Maera) ...... 434 quadrimana (Opis) . ». 2». .... 42 quadrimana (Orchestia) . . .». . - 548 quadrimana (Talorchestia). . . . 548 quadrimanus (Amphithoe) . . . . - 635 quadrimanus (Gammarus) . .. . - 434 quadrimanus (Moera) . »..... 434 quadrimanus (Niphargoides) 452 quadrimanus (Normanion) . .. 42 quadrispinosa (Melita) . ... . 422 quadrispinosa (Pallasea) 377, 730 quinquefasciatus (Gammarus araneolus Be A 479 quoyana (Orchestia). .. ».... 547 quoyana (Orchestia (Talorchestia)) . 547 quoyana (Talorchestia) . . .. . 547 qvadridentatus (Halirages) . . . . . 292 qvadrimana (Normania) . . ... . 42 qvadrimanus (Niphargoides) . . . . 452 qvadrimanus (Normanion) . . . . . 42 qvadrispinosa (Pallasea) .... . . 377 qvadrispinosa (Pallasea cancelloides RE NE ER Dur 1 1 Sr 377 qvadrispinosa (Pallasia) . . - . . . 377 qvadrispinosa (Pallasiella) . . . . . 377 ange en, ir 347 radoszkowskii (Acanthogam- ZBABUR). ua au een 510, 735 radoszkowskii (Geradocus) . . . - . 510 radoszkowskii (Otenacanthus). . . . 785 radoszkowskii (Gammarus). . . - . 510 Alphabetical Index 777 page ramondi (Amphithoe) . » .» » . » . 642 ramondi (Ampithoe). . . ...». 642 ramsayi (Melita) . : . :... ae: ramsayi (Moera) . » 2 2.2.2.%0% 431 FaDex (Üsrspns) cc. 671 rapax (Elasmopus) . . . . 442,444, 446 rapax (Elasmopus) . ...... 444 rapax (Erichthonius) . . ..... 671 raschii (Trischizostoma) . . .» - ». - 13 rathkei (Calliopius) - - » » ...» 296 rathkii (Amphithoe) . . » . ...» - 296 rathkii (Calliopius) . - . . . .» . 296 ratisbonensis (Niphargus) . . . . . 407 recens (Allorchestes) . ». » .».. » 557 rectimana (Orchestia). . . - - - 543 rectirostris (Halimedon) . . . . . 251 rectirostris (Westwoodilla) 251 recurvatus (Crangonyx) . » ....» 373 recurvus (Crangonyx). » » - »- » 373 reeurvus (Gammarus) . » » 2... 373 redmanni (Gammarus) . » »...».. 742 reicherti (Orangonyx) - - » .». .» - 393 reichertii (Brachyuropus) . . . . 39 reichertii (Gammarus) . . .» 2... - 393 reinhardi (Amphithoe). . . .... 607 reinhardi (Photis) . 606, 607, 608, 608, 609 reinhardi (Photis). . » ........ 607 reisnerüü (Pallasea) .. . -....- 376 reissnerii (Gammarus) . . » 2... .- 376 reissnerii (Pallasea). . . . ... 376 reissneri (Pallasea) . : ... 2... 376 relietus (Gammaracanthus) . . - 507 reynaudii (Amphithoe). . . . ..» - 557 reynaudii (Neobule). . ..... 557 Bhschotropisr 347 rhipidiophorus (Gammarus) 410, 732 rhipidiophorus (Niphargus) . 410,732 rhodophthalmus (Carinogamma- 2 13 RR SELTEN U RE Re Re Kal 504 rhodophthalmus (Gammarus) . . . . 504 rhodophthalmus var. mierophthalmus (dammarus) - ... % 2.00%, 504 richardi (Cyphocaris) . . . . . . 717 richardi (Hyalella) .......- 736 richardi (Melita) . : : . -... 732 riehardi (Stenothoe). . . .» -» . » 194 richiardii (Leucothoe).. . - . - - 167 richiardii (Leueothoe) . . - -» . » » 168 riisei (Eusiropsis). - » » - ...» 343 rimapalma (Naenia) . .»..... 620 rimapalma (Noenia). .......- 620 rimapalmata (Naenia) . ...... 620 rimapalmata (Noenia) . . 2»... - 620 rimapalmata (Podoceropsis) 620 rissoanum- (Ieridium) 201 rissoanus (Phlias) . . -. »...... 201 rivularis- (Lepleurus) . . .. . . 715 778 page robertsoni (Bathyporeia) . . . . 121 robertsonü (Bathyporeia). .. - : » 121 robertsoni (Sophrosyne). . . . . 21 robusta (Haploops) . . ». -»... 118 robusta (Metopa) . . . ... 173, 724 robusta (Metopina) . ..»...... 724 robusta (Sthenometopa) -. » . - »- . 724 robustoides (Gammarus) . . ... - 458 robustum (Corophium) . .... 689 robustus (Cheirocratus) . . 419 robustus (Gammarus) . . . ... - 742 robustus (Hippomedon) . :. . . . 59 robustus (Niphargus plateaui) 731 roeselii (Carinogammarus) 506 roeselii (Gammarus). » . : 2... 506 röseli (Gammarus) . ... 2... 506 roseus (Carinogammarus) . . . . 734 roseus (Ütenacanthus) . . . . .. .» 734 rossi (Orehomenopsis) . . . . .» 721 vrostrata (GHHtans) nie 156 rostrata (Oediceroides). -. - . .. 268 rostrata (Oediceropsis). -. » » ..» » 268 rostrata (Pontharpinia) . . .. .- 146 rostrata (Rachotropis),. . » » » » » 353 rostrata (Rhachotropis) . . . . . 353 rostratus (Halimedon) . . . ... » 268 rostratus (Oediceroides) . . -. - - 268 rostratus (Phoxocephalus) . ... . 146 rostratus [Phoxzus). + us: 5% 146 rostratus (Urothoe) . . . . 146 Hominsne rauen 354 rubella (Ampelisca) . . .. . 104, 722 rubella (Ampelisca) » » 2... . 107 rubella (Amphithoe). . ...... 640 ruber (Carinogammarus) 734 ruber (Otenacanthus) .. .. 2... 734 » Tuber fUrALB68) 0,9... 132 rubiformis (Cerapus). . . .. - 673, 740 subre Iyalo)! en 572 rubra (Nicea). ... . Eee Ale SOER Tubr& (Urothos) :, u... ,% 132 rubricata (Amphithoe) 557, 634, 634, 635, 635, 635, 636, 637, 637, 638, 638, 639, 639, 640, 641, 641, 641, 641, 642, 644 rubricata (Ampithoe) . . . . . 639 rubricatus (Astacus). .....».. 639 rubricatus (Cancer (Gammarus)) 639 rubricornis (Allorchestes) . . . . 585 rubrieornis (Cerapus) . . .. . 673, 740 rubricornis (Erichthonius) . . . . - 740 rubrieornis (Eriethonius) . . . . 740 rubrieornis (Hyale (Allorchestes)) . . 585 rubromaeulata (Maera) ...... 430 rubromaeulata (Moera) ...... 430 rubromaeculatus (Ceradocus) . . . 430 rubromaeulatus (Ceradocus) 439 rubromaculatus (Gammarus) 430 Alphabetical Index page rubropunectatus (Talitrus) . . . . . 742 rubrovittata (Metopa). . ... . 180 rudis (Hyale) . : . . „2... 573 FRA TNIGBM).. u. 202: A ER 573 ragoans (Atylas).. . serie 402 rugosus (Gammarus) » » » 2... 402 rugosus (Mieruropus) . . ... . 402 runeicorne (Corophium). . . . . 689 runeinatum (Corophium) . . .» . . . 689 rupicola (Allorchestes) . .... .- 573 uplcola «Hyale):: ::.2..0%..% 573 sabatieri (Siphonoecetes) ..684 sabini (Amathilla) ...... 387, 387 ssbinl (Oammarus). . sun mut 387 sabinii (Amathia) . » 2... 1.2. 387 sabrinae (Amphilochus) . . ... » 155 saginatus (Oediceros) . . » .. . 244 saginatus (Oediceros) » » ».. - . 24 salenskii (Amphithoe) . . ».. .. . 590 salmonis (Corophium). . . .. . 692 saltator (Cancer (Gammarus)) 525 saltator (Talitrus) =: 2, 2% 525 Sancho ... u. % a ee 288 saphirinus (Echinogammarus) . . 482 saphirinus (Gammarus) . ».... 482 sarmatus (Echinogammarus) . . 487 sarmatus (Gammarus) ». ..... 487 sarsi (Ampelisea) . .ü.i. 54% 111 sarsi (Busiroides)i:: +... 205% 729 sarsi (Gitana) a 155 sarsi (Gammarus) .. .....» 733 sarsii (Gitana) - » « » ... .. 155,156 sarsii (Metopa) . »- - » 2.2... 190 sarsii (Proboloides) . ». . .... 190 sarsi (Normanion) . ...... 42 sarsi-(Iryphosa)- + 2°... 248% 70 sarsi (Iryphosella) » ».. ».. 0.2... 70 saundersii (Seba) . . .. . - 163, 724 saussurei (Bathymedon).. . . . » 256 saussurei (Halimedon). . . . » 256, 256 savi (dammarus). . . » 2... 513 Bay (Maera) - - 5 wir nn ne 6 DAR sayıı (Moera).... wi nes . 513 sayana (Scamballa) . . ...... 540 sayi (Allorchestes) . . . . . .. 585 scabripes (Ampelisca) . .. . . 722 scabripes (Megalorchestia) . . - . - 528 scabripes (Orchestia (Talitrus)).. . . 528 scabripes (Orchestoidea) . . . . . » Bosmballs 2 00, 55% 530, 543 schamanensis (Echinogammarus) 489 schamanensis (Gammarus) . . » . . 489 scheeleana (Synopia) . . . . . . 272 schiedtei (Oressa) . . ». 2... 191 Schisturella 2... um Te. 719 schmardae (Anonyx) . . .. . 87,721 schmardae (Iehnopus) . » .» ....» 87 ee a a nn a nn HE lat kin im nes nach Ih ar page schmardai (Socarnes) ee schmidtii (Hyale) . . »...... 571 s6hmidtii (Niees) 2... ©. 571 schneideri (Carolobatea) . . . . 252 schneideri (Halimedon) . . . . . . 252 schneideri (Monoculodes) . . . . 263 a a Se ar 308 schwammerdamü (Atylu) . ... . 330 seirtes (Gammarus sophianosii var.) . 494 seissimana (Maera) . » . 2... 485 seissimana (Moers) . - . . 2... 435 seissimanus (Gammarus) . » ».. 435 seitulus (Dexamine) . ..... 517 Moomelocherrus . cu: a. 61 seutigerula (Orchestia) . .» .... 544 seutigerula (Talorchestia) . . . . 544 N 162, 724 sechellensis (Eriopisa) . . » . . 732 Becunda (Batea): . .....2..2% 129 secundus (Synopioides) . -. . . . 227 seidlitzii (Carinogammarus) . . . 503 seidlitzii (Gammarus) . . ..... 503 selkirki (Orchestia) . . . . .. . 538 semicarinata (Amphithoe) .. . . - 449 semicarinatus (Gammarus) . . . - » 504 seminuda (Allorchestes) . . .. . - 574 semmuda (Hyalo). ... 2 = 20.% 574 semiserrata (Maera) . .. ..... 431 semiserrata (Megamoera) . . ... 48] semiserrata (Syrrhoe) . . . .. . 283 semiserratus (Ceradocus) . . . . 431 semmiserrata (Megamaera) . . . . » 431 septentrionalis (Dulichia) . . . . . 713 septentrionalis (Lysianax) . . . . . 38 serra (Acanthonotus) . . .. . 50918 serra (Amphithoe) .. .. . : 218 serra (Perioculodes) . . . . . . 726 serrata: (Bruzelia).. .....0.. 2... 279 ne a 113 Berrata (Byblisy 2....2.22.0, en serrata (Harpinia)....:2. 2%, 142 serrata (Megamoera) .... . .. 4831 ‘ serrata (Melphidippa) . . . .. . 337 serrata.(Neohela) ». 2. ...... 337 serrata (Orchomene) ...... 44 serrata (Syrrhoites) -. ...... . 279 serraticandata (Ampelisca) . . .. . 107 serraticarpa (Leucothoe). . . . . . 167 serraticauda (Atyloides). . . 362, 729 serraticauda (Atylu) . ». ..... 862 serraticaudata (Ampelisca) . 107, 722 serraticornis (Amphithoe) . .. . . 296 serratierus (Dexamine) . . .. . 735 serratipalma (Leucothoe) . . . » . 724 serratipes (Amphilochoides) . . 723 serratipes (Probolium) . . .. . 161 serratipes (Probolium) . . . . ... 723 Alphabetical Index 779 page Sören, (Eryphoss) 2... 2 2.4055 62 serratum (Acanthonotosoma) . . 218, 219 serratum (Acanthonotozoma) . . 218 serratus (Acanthonotus) . . . . 218,219 MUEREBGe LAROBSEN. ee 4 serratus (Hippomedon) . ... . 719 serratus (Oniscus) : . ...... ".. 218 serratus (Örchomene) . . . ».. 44,46 Borratus hlas): 5 2022 201 serratus (Syrrhoites) . . ... . 279 serratus (Vertumnus) . . „2... 218 serrula (Elasmopus) . . .... 733 serrulata (Orchestia) . . .... 535 setiger (Parelasmopus) . ... . 732 setipes (Gammarus (Maera)) . . . . 423 sehen. (Maars) . u.a 423 BOLIDOR CEOUEB) 2 45 26.0 a ae 425 setosa (Amphithoe) . . 2... . 644 386983. (Grubis)?4:272 10, 644 setosa (Haploops). ». ...... 117 setosa (Haploops) u „2... . 118 setosa (Stenothoe) . . .» .... 125 setosus (Gammarus aheneus var.) . . 487 shetlandica (Liljeborgia) . . . - - . 418 similis (dammarus): . ... 12:..0% 466 min (Hoplonye) 127202722, 220 76 similis (Stegocephalus) . ... . 91 similis (Tmetonyx) . ...... 76 simoni (Gammarus) . ... . 3222408 simplex (Amphitoe (Iphimedia)) . . 3683 Bimpiez (Akylus) „u... 04 2% 364 simplex (Iphimedia). .. ..... 364 simplex (Monoculodes) . . . . . 264 simplex (Paramoera) . ..... 363 simplex (Phoxocephalus) . . . . 136 simplex (Phoxocephalus) .... -» 139 simplex (Phoxus) ... . 2..:.% 136, 136 sinhalensis (Stenothoe marina var.) 725 sinuata Metopa) : - . 2. 2.2, 174 Siphonaecetes . .... R . 682 Siphonaecetus ..... ver 682 Siphonocetus . . ..... } Binhonoodelus 2. ee ne. 682 Siphöonoeeetes ..n . 2... .% 663, 663 Siphonoecetes . ...... 681, 740 Siphonoeeetus . ».... rer IR sismithi (Cerapus) . . .. .» s 666 sitchensis (Gammarus) . . » .» ». » 476 smaragdina (Brandtia) . . . . » 3% smaragdinus (Atylus) . . . . » = 898 smaragdinus (Gammarus) . ... » 398 smaragdinus var. intermedius (Gam- a re 398 smithianus (Siphonoecetes) . . . 740 smithi (Autonoe) . ».» 2... . 737 smithi (Lembos) . »...... . 737 smithi (Paratylus). . -» .» 2... 332 780 page smitti (Atylus) » » ..-...» Pe 332 smaittil (Atylus) ss a rn 332 smitti (Nototropis) - - .». »...- 332 smitti (Paramphitho@) . ». ».... 332 smitti (Paratylus) . « » » 2...» 332 Soosinella . 2 ee 719 Socames . » »«. .... R ....86 Sosarnioides s 8 0. vn NEN 47 B66arnöldes ı :. 1.3 Zen ai 47 sokotrae (Elasmopus) . . » ...» 732 sölsbergi (Metopa) - ». ..... 181 solskii (Amathilla) . .». ...... 382 solskii (Gammarus) . . ... 2... 382 solskii (Paramieruropus) ...882 sophiae (Echinogammarus) . . . 485 sophiae (Gammarus) . ». » . 2... - 485 sophiae(Podoceropsis) 619, 620,621, 660, 661 sophianosii (Gammarus) . » ». +» 494 sophianosii (Heterogammarus) 494 sophianosii var. sceirtes (Gammarus) . 494 sophia (Podoceropsis) . .». . .. . 620 BODHLOBYDE u r8s SE 21 speciosus (Gammarus) » » » 2... 515 spectabilis (Metopa).. . »..... 176 speculans (Cerapus) . . » » » ee ; speculans (Dereothoe) . . » »». . 674 spencebatei (Amphilochus) . . . . » 161 spence-batei (Amphilochus) . . . 723 spence-batei (Probolium) . . 161,723 spenceri (Neoniphargus) . . . . 73l spenceri (Unimelita). . » ».... 731 ee ET EN a RR 716 spetsbergensis (Gammarus) . . . - - 742 spinata (Amathillina cristata var.). . 501 spinescens (Andania) -» 2». .... 95 spinescens (Andaniexis). . . . - 95 spinicarpa (Leucothoe) . . . . . 165 KRISE (Leueothoe) 164, 165, 165, 166, 166, 168, 168, 168, 168 spiniearpus (Cancer (Gammarellus)) . 165 spinicarpus (Gammarus) . . .» ..». 165 spinicorne (Corophium) . ».... 691 spinicorne (Corophium) . . . . . 692 spinicornis (Ichnopus) . .... 52 spinicornis (Lysianassa) . . .. - 89, 52 spinidigitus (Urothoe). . . .. . 722 SpESHar. en a en, 134, 140 spinifera (Lysianassa) . . ..... 742 spinigera (Amathilla) 384, 385, 385 spinigera (Amathillopsis) . . 384 spinimana (Ampelisca) . . . 109, 722 spinimana (Amplisca) . . 2... 109 spinimana (Orchestia) - - 2... ... 531 spinimanus (Elasmopus) 733 spinimanus (Nannonyx). .... 35 spinipalma (Orchestia). .» .... 552 spinipalma (Talorchestia) . . . . 552 Alphabetical Index page spinipes (Ampelisca) . .... . 106 spinipes (Gammarus) . ». . 2... 742 spiniventris (Amphithonotus). . . . 516 spiniventris (Autonoe) . . . . » . . 595 spiniventris (Dexamine). - . . . 516 spiniventris (Lembos). . .. . . 595 spiniventris var. pontica (Dexamine) . 515 spinosa (Acanthonotus) » » . .. . 515 spinosa (Amathillina) . . . . .. 501 spinosa (Amphithoe) . ...... 515 spinosa (Axelboeckia). . ... . 391 spinosa (Boeckia) . . ... . 5; spinosa (Dexamine) 831, 331, 516, 516, 517, 517,518 spinosa (Dexamine). . .... +51 spinosa (Iphimedia) . ». » 2... 212 spinosa (Melphidippa) . . . . . . .. 385 Beinase: (Moers) 7002 Br 431 spinosa (Panoplaea) . » »».... 212 spinosa (Panoploea) . . .».... 212 spinosissima (Dulichia) . . . . - 709 spinosissimus (Laetmatophilus) . . . 697 spinosissimus (Spinifer) » . » .. » 134 spinosus (Cancer (Gammarus)) . . . 515 spinosus (Öeradocus) » 2» 2... 355 spinosus (Gammarus) . »..». 335,515 spinosus (Paraphoxus) . .... 723 spinulicauda (Nototropis) - » » .'. 331 spinulicauda (Notrotopis) . » » . - 331 spinulosum (Corophium) 688 squamosus (Amphilochus). . . . 161 squamosus (Hippomedon) . . ... 59 squatinae (Ichthyomyzocus) 742 stagnalis (Gammarus) . » » .».. 474 stanislavi (Gammarus) . « » 2... 494 stanislavii (Gammarus). .....».. 494 stanislavii (Heterogammarus) . . 494 stationis (Mierodeutopus) . . . . 590 Stebbingia . ... - ER RNE 358 stebbingi (Anamixis) . . » ». » 724 stebbingi (Argissa) . . -..... 277 stebbingi (Hoplonyx) . ».».... 720 stebbingi (Hyale) . - . . . . 574,736 stebbingi (Lysianax). . » ».. .» SER stebbingi (Socarnoides) . . . . -» 47 stebbingi (Tmetonyx) . . ... . 720 steenstrupi (Glaueonome) . » . . . 679 Stegocephalidae........ 88 Stegocephalinae. ....2.....88 Stegocephaloides Stegocephalus. . .». ».... TE stegoceras (Leucothoe) . . . . . 724 BERODER EEE ER TREE BER 1 en a TE SER 68. BLEDIe area rar 2 88 stenophthalmus (Echinogamma- TUST U NR LI I U Alphabetical Index 781 : page page stenophthalmus (Gammarus) . . . . 489 | suensis (Megamoera). ». »..... 442 Stenopleura. -. » » v2 0. GIRL BUISBEOR' 5.0 a 22 ra 124 1 N RE 816 | sulensoni (Orchestia) - -» » .» . . 541 Stenothoe . . » =». * 2... . 192,725 | suluensis (Gammarus) . . . 2»... 417 Stenothoidae. ... . . . 192,725 | suluensis (Megamoera). . »... . 417 Stenothoides . » » » 2... +. 725 | suluensis (Parelasmopus) . . 417,732 Stenöthoinsae *.:.:.. ... .....: 192 | Sunamphithoß s° -- .: „> ce. fer 2 645 a re 804 | Sunamphitoe . » » 2... .. 645 stewarti (Allorchestes) . -. » . » .» - 574 | sundevalli (Cheiroeratus). . » . » . 418 Brawarti (Eiyalö) 2.0... 574 | sundevallii (Cheirocratus) . . . . 418 Sthenometopa . ..»..- ... 0. 724 | sundevallii (Gammarus) . . .... 418 stilipes (Exunguia) . . ». . : . » 207 | sundewalli (Cheiroeratus) . . . » . 418 Biimpsonella.... . „2. 0 ....% 588 swammerdamei (Amphithoe) . . . . 330 a 588 | swammerdamei (Nototropis) . . 330 stimpsoni (Amphithoe). . .» . . . .» 642 | swammerdamii (Amphitoe). . . . . 330 stimpsoni (Ampithoe) . . .. . . 642 | swammerdamii (Atylus) . . 330, 832, 332, stimpsoni (Iphimedia) - . -. . - - 217 333, 334 stimpsoni (Monoculodes) . . . . » - 261 | swammerdamii (Paratylus) .. .. . 330 stolzmani (Hyale) . . .».... - 574 | swammerdami (Paratylus) . . . . . 330 8tomacontion . » :» - ......» 16 | swammerdammii (Atylus) . ... . 330 strauchi (Gammarus) . .» ..... 415 | sylvatieus (Talitrus). . .... . 524 strauchii (Gammarus) . . . .. . .» 415 | sylviecola (Orchestia). . 524, 542, 557, 558 ; strauchii (Hakonboeckia) . . . . 415 | sylvicola (Parorchestia) . . . . - 558 3 stroemianus (Oniseus) . . ...... . 742 | Sympleustes . ....... ER BET sturionis (Lafystius) - » .». - ».» 208 | Synamphithoe. . ». .» .... SE 8° sturionis (Laphystius) . . »... 208 | synaptochir (Platophium) . . ... 741 stygius (Gammarus) . . „ ...... 407 | symaptochir (Podocerus). . . - . 741 stygius (Niphargus) . . . » 2... . 406 | Synchelidium . . . » 22... 241 stygius (Niphargus) . . ... ... 7 1 BHoDle EEE 271 Stygobromus .. . 2... 48870 I Synopidae . 2. wie ein a 270 ee Fe ar da RL 870 | Synopiidae ..... 2 ...% 270 EONBEHER 7 TE 229 | Synopinae - “vn 270 stylifera (Leucothoe) . . . . . - 108 | Bynopieides..; tr 226 stylifer (Allorchestes) . . . . - - Se>:; Spturella 277 368 subcarinata (Elasmopus) . . . - . » 441 | syriacus (Gammarus) . . - . » .» 475 subearinata (Megamoera). . . . . . BAT | Swechos: .; 2er: ut 2878 subcarinata (Moers). . 2... ....44l | Syrrhoe. . 2... 281 subearinatus (Carinogammarus) . 505 | Syrrhoidae. .... 22... 273 subearinatus (Blasmopus) . . . . 441 | Syrrhoinae. .... 2.2.2... 273 „. subcarinatus (Gammarus) . ..... . 505 | Syrrhoites . . 2... 2.2.20. 279 a RT N 206 | taczanowskii (Acanthonotosoma) . . 382 subnudus (Gammarus) . . ».. 465 | taezanowskii (Gammarus) ... ..- 382 . subnudus (Monoculodes) . . . . 266 | taczanowskii (Paramieruropus) . 382 subtener (Gammarus) . . ....” 742 | tahitensis (Cyelocaris). -. . . »- - 30 subtenuis (Chiltonia) . . .. . . 735 | tahitensis (Orchestia) . » .... .- 543 subterranea (Calliope) . -». ... . 294 | Talitridae . ........ .. 523 subterraneum (Acanthonotosoma) 294,295 | Talitrini. ».. 2. 2.2.2220. 523 subterraneus (Caliopius) .i.-.’*:. . 294 | Palitroides . - ... 2... 2 0... 527 subterraneus (Crangonyx). . . . 371 | talitroides (Atylus) . » » 2... 400 subterraneus (Crangonyx) . » » . . 389 | talitroides (Gammarus) . » ».. .» 400 subterraneus (Gammarus) . . . . . 410 | talitroides (Micruropus). . . - - 400 subterraneus (Niphargus) 407,408, 408,408, | Talitronus .. .. 22.2220... 527 410,410 | Talitrorchestia ...’... ...% 524, 526 subterraneus (Niphargus) . . 410,732 | Talitrus . : » ».. .. 218,218, 530, 532 subterraneus (Paraleptamphopus) 29 | Talitrus. ... 220. een... 524 suceineus (Gammarus aheneus var.) 487 | talitrus (Gammarus) . » 2... ... 478 ‚suensis (EBlasmopus) . .... . 442 | talitrus (Poekilogammarus) . . -» 478 782 page Tlorchestes*. 2. Ger 543 Talorchesua 1, 0 ee ae ar 536 Talorchestia . -. .»..... R 545 tasmaniae (Atyloides) . ». .».»- 361 tasmaniae (Pontogeneia) 361 tatrensis (Niphargus) . . . . » - 410 tauriea (Brubis) .. .+. .-... 00% 644 taurica var. massiliensis (Grubia) . . 644 taurus (Ichnopus) . ». ». » >»... 52 taurus (Ichnopus). . » »..»... 53 teeticauda (Gallea) . . .....- 723 telluris (Orchestia) . » » » » » 537,551 telluris (Talorchestia). . -» »- - » D5l tenebrarum (Boruta) . - .... 368 tenella (Amphithoe). . » »»». 574 tenella (Hyale) . ... +»... 574 tenella (Maera) . . - . .....%» 434 ten6ls (Mae) 36 5 438 tenella (Moera) ». ». .....».. 434, 438 tenella (Stenothoe) . . .». »... 196 tenellus (Gammarus). . . .. - 438, 470 tenellus (Pardaliscoides) 225 tenera (Maers) ...14.35 0 434 tenuieorne (Corophium) . » »» .» » 688 tenuicornis (Ampelisca) . » . » - 110 tenuicornis (Amphithoe) . . . . 429,515 tenuiecornis (Amphito& (Melita)) . . 429 tenuicornis (Dexamine) . . . . 515,516 tenuicornis (Eurystheus) . . . . 738 tenuicornis (Gammaropsis). » » »- » 738 tenuicornis (Gammarus) . » » x... 429 tenuieornis (Glycera) . »....».» 6l tenuicornis (Glycerina) . ». ».. 6l tenuicornis (Ischyrocerus) . . . . 660 tenuicornis (Maera) . » »».».» . 732 tenuicornis (Melita) . . -» .» . . 429,429 tenuicornis.(Moera) .- . . - 429 tenuicornis (Paramoera) . . ... » 429 tenuieornis (Photis). - - - » » » 608 tenuicornis (Podocerus) . - .» » . . 660 tennimana (Maeraä) . , . .:..2...486 tenuimana (Metopa). . . - ... 181 tenuimanum (Synchelidium) . „ . 243 tenuimanus (Amphilochus) . . . 150 tenuimanus (Amphilochus) . . . 151,152 tenuimanus (Gammarus) -..... 436 tenuipes (Bathyporeia). -. » .».. . 120 tenuipes (Uratippus). » x x...» 207 tenuipes (Mierodeuteropus) . . . . » 587 tenuipes (Mierodeutopus) . . .» . . 587 tenuipes (Pardalisca) . . . . .. 223 tenuipes (Polycheria) -. . . . . . 520 tenuipes (Vijaya) .- . .. Sri tenuirostratus iimiohee) Br Yo tenuis (Autonöß) ..,: =. 0.0.» 600 tenuis (Crangonyx) - . -» . » . ..372 tenuis (Gammarus) . ». 2»... .. 600 Alphabetical Index page tenuis XL:8m7b08) 2.2 3.05 20255 600 tenuis (Mierodentopus) . ».... 600 tenuis (Mierodeutopus) . . » x.» „ . 600 tenuls (Orchestia) - .. - 2 ». 2.5 557 tenuis (Parorchestia) . .... . 557 Doraleuier 23; 0,252, 2a 162 terebans (Chelura) . ...:.... 693 terebrans (Chelura) . . ..... 693 tergestinum (Probolium) . .... . 196. terraereginae (Talorchestia) . . . . 552 terschellingi (Orthopalame) 604 Eossarope 2:0 ee 275 tesselatus (Monoculodes) 264 tessellatus (Monoculodes) .. .. . 264 testaceus (Echinogammarus) 485 testaceus (Gammarus) . » » 2... 485 testudo (Acanthonotus) . ».... 323 kestudo (Vpiseus) ... is ars 201 testudo (Pereionotus) . . . . 201, 726- tetrachantus (Gammarus) . . . . 733 PBetradsion:. +, nee Tetromatides ... ru eu 97 Taomalae: 32.4 a re 98 Thalitros, 2 >... msn aan 524 Thelorcheslia . . sin un Di thea (Dexamine) . ....... 516 Ihersites 7.34 422.00 a ie Alp Foren N re . 805 DUOOlAOR . >, 4 0, ia ER thompsoni (Eurystheus). . . . » 612 thompsoni (Gammaropsis) . . . » . 612 thompsoni (Maeroides) . . ». . . . . 612 thompsoni (Tirop)...:... .. 2.5: „2 701 thomsoni (Eurystheus) . .... 613 thomsoni (Gammaropsis). . . .. .» 613 thomsoni (Megamoera) . . » . . . .. 439 thomsoni (Nannonyx). . ». . ... 36 thomsoni (Neoniphargus) . . 404,731 thomsoni (Palinnotus) . . -. . . . 202 thomsoni (Pereionotus) . » » » » » 202 tiberiadis (Orchestia) . . . . . .. 540 FEOB ee re EEE Pironidao . 1... 00.0.0: re titii (Mierodeutopus) . . . .. . 594 SIIDEIORVE rn 73, 720 tongensis (Amuhiikbe a SO tongensis (Amphitoe) . . ». » ... 642 tongensis (Ampithoe) . .... . 642 topsenti (Aristias). - . -» 2... 718 torelli (Ceradocus) . . .». » . ... 432 torelli (Gammarus) . ».....x. 432 toreli KMaBie). ee »: ...488 torelli (Megamoera) . » » » .... . 482 toxophthalmus ass 490 toxophthalmus (Gammarus) . . . . 490 traillii (beucothoe) . . » ». . . 164 translucens (Apherusa) . . . » . 308 EEE Alphabetical Index 783 page page translucens (Panoplaea) . .». ... - 308 | tubereulata (Pleustes) . - ..... all traskiana (Orchestia) . - - -» » » 534 | tubereulatus (Atylus) . »..... 397 triaenonyx (Corophium). . .. » 740 | tubereulatus (Gammarus) . .... 397 triearinata (Acanthozone) . .» .. - 326 | tuberculatus (Ischyrocerus) . . . 6#1 tricarinatus (Acanthechinus) . . . . 326 triecarinatus (Actinacanthus) . . . 326 triehobostryehus (Aora) . » ». » 587 trieristata (Acanthosoma) . . . . - 321 trieristata (Epimeria) - » ».... 323 trieristatus (Leptocheirus) . . . . 629 trieristatus (Ptilocheirus). . » » » » 629 trieuspis (Acanthonotus) . .». .» .. » 301 trieuspis (Acanthozone) . . . . 301,301 trieuspis (Cleippides) . - . : » » 301 trieuspis (Dexamine) . » ».... 301 trieuspis (Paramphithoe) . . .». . .» » 301 krieuspis (Pheruss) - . ...:..-.... 291 tridens (Ampelisca) . . : . ... 722 tridens (Leucothoe) . . . ... . 166 tridentata (Amphithopsis) . . . »- - 305 tridentata (Apherusa) . .. ... 305 tridentata (Dexamine) . .».... 305 tridentata (Paramphithoe) .. . . - 305 tridentata (Talorchestia) . . . . . 546 tridentatus (Eurystheus) . . . .. . 618 tridentatus (Halirages) . -».... 305 trigonica (Tryphosa) ..... . 70 trigonieus (Hippomedon). . » . . » 70 trigonocheirus (Orchestia) . . .». . . 5831 trioculata (Hirondellea) . ... . 16 tripudians (Talitrus). . . ..... 742 Trischizostoma . . ...... 12, 717 Trischizostomatina ...... 8 tristanensis (Ischyrocerus) . . . . . 650 tristanensis (Parajassa) . . .. . 650 tristanensis (Podocerus) . .... . 650 a an 330 a KL ER TE RER 517 a Er 347,354 truneata (Harpinia) . . . .... 144 truncatipes (Amphithoe) . . . .. - 435 truncatipes (Maera) . . 434, 435,440, 445 truncatipes (Moera) . . . . . . 435,512 truneatus (Gammarus) .. . ... .- 742 en RER nr 68, 720 en 77, 81,86 Zusphosella‘ .. 2. ....'. re 1: ERNTDBOBOHB:. 2722 ee. 67, 720 BERSDHORILEN: 4. ee, 77 tubereulata (Brandtia) . . . . . 397 tuberculata (Bruzelia). . .... 275 tubereulata (Dulichia) . . . . 710, 710 tuberculata (Dulichia). . . . . - 713 tubereulata (Epimeria) ..... 323 tuberculata (Gmelinopsis) . . . . 414 tubereulata (Orchestia) . -» . . . . 527 tuberculata (Orchestoidea) . . . 5297 tuberculatus (Laetmatophilus) . . 696 tuberceulatus (Laetmatophilus) . 696, 697, 697, 703 tuberceulatus (Monoculodes) . . . 265 tubereulatus (Pleustes) . .. . . 311 tubereulatus (Podocerus). . . . . . 661 tubereulosa (Naenia) . .. 2... 620 tubereulosa (Noenia) . ». ».... 620 tubicola (Haploops) . . ». . . . 116, 117 -tubieola (Haploops) . ». ». » .. . 117 tubularis (Cerapus) . . . . . 667.740 tueuratinga (Örchestia) . .» .» . » . 534 tucurauna (Orchestia) . . . . . - 534 tumida (Nieippe) . . »».... 226 tumida (Örchestia) . . ... . 550, 554 tumida (Rhachotropis). . . » .». » 851 tumida (Talorchestia) . . . . . - 550 tumidus (Anonyx). ». 2» 2... 49, 50 tumidus (Aristias). . -» ».... 41,50 tumidus: (Aristiasy‘,". . . ...22% 49 tunetanus (Gammarus) . . . .. 477 turgidus (Anonyx (Onisimus)) . » » 26 turgidus (Onisimus). . . .»..». 26 typhlops (Anonyx) -. »».2.....66 typhlops (Centromedon).. . .» . . 66 typhlops (Lepidepecreum). . . . 78 a NEE... typica (Ampelisca) . ». ..... 109 %96108.(A0r8): Sa 587 fypica (Argassa). .. 22: 2 877 typiea -(Boeckia) . .-.:... 2... 628 typica (Bruzelia) . -. ...... 274 typica (Haplocheira) . .. . . . 609 typica (Iphigenia) . ..... . . 204 typiea (Iphinotus)... » . 2»... 726 typica (Opis) . » » » - el TI typica (Paradulichia) . ..... 714 typiea (Paranaenia) . »....... 615 iypiea (Bebay. Sr rn 163. typieum (Teratieum) . . » .» 2... 163 typieus (Iphinotus) . . -. . - 204, 726 typicus (Metaphoxus). . . . . » 138 typicus (Siphonoecetes) . . . . » 682 typieus (Siphonoecetes) 683, 683, 684 typieus (Tetromatus) . » ».... 109 ultramarina (Synopia). . » .»» .» 271 ultramarina (Synopia) . 272, 272, 273, 273 umbo (Anonyx).. . . 0. +... 80 umbo (Lepidepecreum) . . . » . 80 umbo (Lysianassa) . »..... a: ) umbonata (Pseudotryphosa) . . » . 64 umbonatus (Anonyx) . ..... . 64 umbonatus (Ichnopus). . » .» ». 64 ’ 784 umbonatus (Uristes) . « .....64 umbo (Orchomene) ä uneinata (Ampelisca) . . . . 105,721 uneinatus (Atylu) -. »-..»... uncinatus (Paratylus) Uneiola. . uneirostrata (Pontharpinia) . uneirostratus (Leptophoxus) . . + » uneirostratus (Phoxocephalus) . . . uneirostratus (Phoxus). ». » . » » » 147 676 147, 723 723 undata (Naenia) -. » «2»... . 620 undata (Noenia) ».. » v2... 0.% 620 unguiserratus (Gammarus) . . . »- - 742 Unimelitae '. . =. +. SEE A RR Ueistan 2.0 ee 63 urodus (Lysianax) -. » » 2... 718 TEROEHOO.L: 2 ana ba 128, 722 Teikae 2 war 35 sr Urothoides . ». .....- . 132 ussolzevi (Gammarus) . » »...- 488 ussolzevii (Gammarus) . . » 2... 488 ussolzewii (Echinogammarus) . . 488 ussolzewii (Gammarus) . ».... 488 ussolzewii var. abyssorum (Gammarus) 488 uzzolzewii (Echinogammarus) . . . . 488 vablıi (Anonya) 2. in. ee 57 vahlii (Ephippiphora) . . » »... 57 vahlii (Lysianassa) . » » 2.2... 57 vahlii (Socarnes) -» » ». .». 2... 57 vahli (Lysianassa) -. ..: 2.2... 56 vahli (Soearnes) . - »...... 56, 57 vaillantii (Amphithoe). »...... 639 vaillantii (Ampithoe) .. ... . 639 ‚vaillantii var. pontica (Amphithoe) . 639 BR URL, ir A WIERHGRB. a. er 8 valida (Amphithoe) . . . . 635, 643, 738 valida (Ampithoe). ..... 635, 738 valida (Masera) .. ...... N 423 valida (Melita) . . -. . er 423 valida (Stenothoe). . » ..... 194 valida (Stenothoe) . » » . . . 195,19. valida (Sunamphithoe) ...... 643 validum (Cratophium) . » 2 2... 654 validus (Gammarus (Maera)) . . . . 423 validus (Pleonexes) . . .». .... 643 validus (Podocerus) ». ». ».. 2...» 654 validus (Stenothoe) . » » » 2... 19 variegata (Janassa) - » 2». 2... 689 variegata (Lysianassa) . . ... 39 variegatus (AnonyxX). ©» 2 2.2... variegatus (Lysianax) - . » 2» 2...839 variegatus (Podocerus) . »... vedlomensis (Atylus) - 2 2... vedlomensis (Dexamine) . ..... vedlomensis (Nototropis) . . . » vedlomensis (Paratylus) .. 2»... Alphabetical Index page vejdovskyi (Eucrangonyx) . . . 389 vejdovskyi (Niphargus puteanus var.) 407 veneris (Gammarus) . . . . » 472 verrauxii (Gammarus) . =» 2 2.2... 459 verreauxii (Dikerogammarus) . . 459 verreauxii (Gammarus) . » » 2... 459 verrucosus (Echinogammarus) 481 verrucosus (Gammarus) . » 2... 481 versiculatus (Coremapus) . - . . 786 versiculatus (Lembos) . » » ... . . 593 versiculatus (Mierodentopus) . . . . 5% versiculatus (Mierodeuteropus) . . . 593 versiculatus (Microdeutopus) 593,736 De, Kat ° verticellatus (Allorchestes) . . . » » 566 vertieillata (Allorchestes) . . . . . 566 vertieillatus (Allorchestes) . . . . - 566 RR UN ie ee RR 321 vietorii (Gammarus godlewskii var.). 510 vietorii (Polyacanthus godlewskii var.) 734 Vijaya ......» RIEF EEE 717 vaillosa (Hiyale) ten RT RE 574 villosa (Parharpinia) . . .... 147 villosus (Atylas) .. Sau 334 villosus (Nototropis) - . . .. . 334 villosus (Phoxocephalus) . . . . . De 7 vilbosus: (Phoxüs) .. ur 147 violaceus (Echinogammarus) . . 492 violaceus (Gammarus) ». » .».2... 492 violaceus (Gammarus faseiatus). . . 432 violaceus_ var. virescens (Gammarus) 492 virei (Niphargus) . . ... . 408, 731 virescens (Amphithoe). . .».... 643 virescens (Gammarus violaceus var.) 492 virescens (Pleonexes) . . .... 643 viridis (Dybowskia) ». . 2 2.2.2... 730 viridis (Echinogammarus).. . . . 484 viridis (EBlasmopus) . ...... 445 viridis (Gammarus) . . 0... 484 NUISTHLDOFR) = 1er u ia eat era 445 viridis (Pallasea) . » .....% 730 viridis var. canus (Gammarus) . . . 484 viridis var. olivaceus (Gammarus) . . 484 vitreus (Crangonyx). . . .:... 372 vitreus (Crangonyx) -. » » 2.2... 389. vitreus (Stygobromus). . . 2... 372 vittatus (Eehinogammarus) . . . 491 vittatus (Gammarus). ». » » 2... 491 voeringii (Hyperiopsis) . »»... 715 volutator (Corophium) . . . .. .» 686 volutator (Oniseus) » . 2.2... 686 vorax (Paragrubia) . »...... 739 vöringi (Hyperiopsis) -. ». 2»... 715 vßsringii (Hyperiopsis). . .». .».. 715 vortex (Gammarus) . . »....- . 400 vortex (Mieruropus). -. - » » . . 400 vulgaris (Iphimedia). ....... 742 wagii (Carinogammarus) . . 502,734 Alphabetical Index 785 wagüi (Ceradoeus). » » 2.2... wagii (Ötenacanthus) . » » .... wagii (Gammarus) » ».... ee wahlii (Atylus) . ». .. 2-2... wahlii (Gammarus) © » » 2.2... wahlii (Mieruropus) . ». ».».. wahlii var. platycercus (Gammarus) . walkeri (Atylus) . . ..... x walkeri (Syrrhoites). . » »..».. warmingi (Hyalella). . . . De warpachowskyi PEERETEN N websteri (Autonoe) -. » » 2... . websterii (Lembos) . . » . » dei websterii (Mierodentopus) . . » » » websterii (Mierodeutopus) ». . » . » websteri (Mierodeuteropus) . . . » » websteri (Mierodeutopus) . . » . » weidemanni (Gammarus) . . .. BWEStWoDden ren ee Westwoodia . -... ER westwoodi nee, Ba Re westwoodü (Dryapoides). . ».. . Westwoodilla. . ». 2.... RT, westwoodi (Maera) . . ».... ANOSDFOCHUIBE nennen whitei (Cerapus) . » ........ whitei (Protomedeia) . ...... whitei (Siphonoecetes) . ». ..... whitei (Siphonoecetus). . » .... whiteleggei (Iphiplateia) . .. - 203 wilkitskii (Gammarus duebenii var.) . 733 woodmasoni (Lysianassa) . . . .. 88 Wyvvillea 2. 42, N ee NT Xenocheira . .... N BE 624 EHRE ea OLE 624 Benoclon- Zt ea EEE HLE Xenodice . . . . ET BEER 699 xylophaga (öunoris):: 3010. 698 VE EEE I ER 806 zamboangae (Ampelisca) . . . . 110 RTOROHE a ae te ae Zaramilla.. . ..... RE: e) zebra (Atylus) ..... ee n/..:808 zebra (Gammarus) . » . . . .. 398,658 zebra (Ischyrocerus). . » ».... 658 zebra (Podoeerus) . : ........%....058 DER re ie a se a ar 699 zeylanica (Melita). . . :.. .. »... 733 zeylanieum (Platophium). ..... 741 zeylanieus (Eurystheus) . . . . . 738 zeylanieus (Gammaropsis) . . . . . 738 zeylanicus (Podocerus) . . . .. 741 zienkoviezii (Ceradocus) . . . » . . 509 zienkowiezii (Acanthogammarus) 509, 734 zienkowiezii (Ötenacanthus) . . . . 734 zienkowiezii (Gammarus). . . » » . 509 zschanti (Anonyz) .. ..* 0... 04.1, 88 zschauii (Orchomenopsis) . . .» . 85 Das Tierreich. 21. Lief.: T. R. R. Stebbing, Amphipoda I. 50 Nomenclator generum et subgenerum. Acanthechinus Thomas R.R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 883. 1888. Sp.: A. tricarinatus. „üxavda, a spine, and &yxivoc, a hedge-hog or sea-urchin“. Acanthogammarus Thomas R.R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 v. 7 p. 430. 1899 V. Sp.: A. cabanisii, A. zienkowiezü, A. godlewskü, A. rodoszkowskii, A. armatus, A. para- siticus. „alludes to the dentate carinae“. Acanthonotosoma/[pro: Acanthonotozoma' A. Boeck 1876]. W. S. M. D’Urban in: Ann. nat. Hist., ser. 5 v. 6 p. 255. 1880. Acanthonotozoma Axel Boeck, Skand. Arkt. Amphip., ©. 2 p. 237. 1876. Sp. typ.: Acanthonotus cristatus. „ükavda (Torn), vorog (Ryg), oö@ua (Legeme)“. Acanthonotus ([Richard] Owen in MS.) James Clark Ross in: John Ross, App. sec. Voy., nat. Hist. p.90. 1835. Sp.: A. cristatus. Acanthosoma ([Richard] Owen in MS.) James Clark Ross in: John Ross, App. sec. Voy., nat. Hist. p. 91. 1835. Sp.: A. hystrix. Acanthostepheia Axel Boeck in: Forh. Selsk. Christian., 1870 p. 163. 1871. Sp.: A. malmgreni. Acanthostephia [pro: Acanthostepheia A. Boeck 1871]. Eduard von Martens in: Zool. Rec., v.8 p.190. 1873. Acanthozoma pro: Acanthonotozoma A. Boeck 1876. Axel Boeck, Skand. Arkt. Amphip., %.2 p.229, 712. 1876. Acanthozone Axel Boeck in: Forh. Selsk. Christian., 1870 p. 184. 1871. Sp.: A. cuspidata. Aceroides G. O.Sars, Crust. Norway, v.1 p- 340 t. 120. 1892. Sp.: Aceropsis latipes. Aceropsis Anton Stuxberg in: Bih. Svenska Ak., 0.5 nr. 22 p.63. 1880. [nom. nud.] Aceropsis pro: Aceroides O. Sars 1892. G.O. Sars, Crust. Norway, v.1 t. 120. 1892. Aceros Axel Boeck in: Forh. Skand. Naturf., Mede 8 p. 651. 1861. Sp.typ.: Oedicerus obtusus. Acidostoma William Lilljeborg in: N. Acta Soc. Upsal., ser.3 v.&nr. 1 p.18 (tabell.), 34. 1865. Sp.: A. obesum. „From 4kig a point and oröua mouth“. Acidostomum pro: Acidostoma W. Lillje- borg 1865. Antonio Della Valle in: F. Fl. Neapel, ©.20 p.19, 916. 1893. Acontiostoma Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 709. 1888. Sp. typ.: A. marionis. „from akxövrıov, a dart, otöua, a mouth“. Actinacanthus Stebbing 1888. in: Tierreich, v. 21 p. 326. „aktic, ray, ükavda, spine“. pro: Acanthechinus T. T. R. R. Stebbing 1906 IX. Aedicerus [pro: Oediceros Kroyer 1842]. William A. Haswell, Cat. Austral. Crust., p. 238, 315. 1882. Aglaura C. S. Rafinesque, Anal. Nat., p-101. 1815. [nom. nud.] Alibrotus[Henri] Milne Edwards, Hist. nat. Crust., ©. 3 p. 23. 1840. Sp.: A. chauseicus. Alicella Ed. Chevreux in: Bull. Soe. zool. France, v.24 p.154. 1899. Sp.: A. gigantea. Nomenclator generum et subgenerum 787 Allorchestes Jacobus D. Dana in: Amer, J. Sei., ser. 2 0.8p.186. 1849 VII. — Jacobus D. Dana in: P. Amer. Ac., v.2 p.205. 1852. Sp.: A. compressa, A.verticillata, A.hirtipalma, A.gracilis, A. perwviana, A. humilis, A. australis, A. brevicornis, A. novi-zealandiae, A. intrepida, A. orientalis, ? A. graminea. Allorchestina Subgen. J. F. Brandtin: Bull. phys.-math. Ac. St.-Petersb., v. 9 p.141. 185119. Sp.: Orchestia nidro- siensis, ?O. perieri. Amanonyx (. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.58. 1856. Sp.: A. guerinianus. [nom. nud.] Amaryllis William A. Haswell in: P. Linn, Soc. N.S. Wales, v.4 p.253. 1879. Sp.: A. macrophthalmus, A. brevicornis. Amathia Heinrich Rathke in: Mem. pres. Ac. St.-Petersb., v.3 p. 375. 1837. Sp.: A.carinata. „nach einer Meer- nympfe“. Amathilla pro: Amathia H. Rathke 1837. C. Spence Bate and J.O. Westwood, Brit. sess. Crust., v.1 p.359. 1862 VII1, Amathillina G. O.Sars in: Bull. Ac. St.-Pötersb., ser.5 v.1 p. 201, 203. 1894. Sp. typ.: A. cristata. Amathillinella pro: Amathillina G. O. Sars 1894. ([O.] Grimm in MS.) G. O. Sars in: Bull. Ace. St.-Pötersb., ser. 5 v.1 p.201. 1894. Amathillopsis Camil Heller in: Denk. Ak. Wien, v.35 p.35. 1875. Sp.: A. spinigera. Ambasia Axel Boeck in: Forh. Selsk. Christian., 1870 p. 97. 1871. Sp.: A. danielssenii. Ampelisca Henrik Kreyer in: Naturh. Tidsskr., v.4 p.154. 1842. Sp.: A. eschrichtii. „Nomen wmulieris apud Plautum in Rudente“, Ampelisia [pro: Ampelisca Kreyer 1842]. ' H.Kreyer in: Voy. Nord, Crust. t. 23 f. 1. 1846. Amphilochoides G. O. Sars, Ürust. Norway, v.1 p. 220. 1892. Sp. typ.: Amphilochus odontonyx. Amphilochus C. Spence Bate & J.O. Westwood, Brit. sess. Crust.,. v.1 p.179. [186211.] Sp.: A. manudens. Amphitho& [pro: Ampithöe Leach 1813/14]. [Pierre Andrö] Latreille in: Nouv. Dict., ed.2 v.1 p.470. 1816. Amphithoides Robby Kossmann, Reise Roth. Meer., v.21 Malacost. p.135. 1880. Sp.: A. longicornis. Amphithonotus (A. Costa in:) F. G. Hope, Cat. Crost. Ital., p. 45. 1851. Sp.: A. marionis, A. panopla, A. cari- natus, A. acanthophthalmus, Acantho- notus guttatus. Amphithopsis Axel Boeck in: Forh. Skand. Naäturf., Mode 8 p.661. 1861. Sp.: A. bicuspis, A. elegans, A. laeviuscula, A.tridentata, A. glaber, A.longicaudata. Amphitoe [pro: Ampithöe Leach 1813/14]. F. E. Guerin-M£neville, Ieconogr. Regne an., v.3 Crust. p.23. 1836. Amphitonotus [pro: Amphithonotus A. Costa 1851]. Adolph Eduard Grube, Ausfl. Triest, p. 136. 1861. Amphitopsis [pro: Amphithopsis A. Boeck 1861]. Julius Vosseler in: Arch. Naturg., 0.551 p.156. 1889. Ampithöe [William Elford Leach in:] Edinb. Ene., v.7 p.403, 432. [1813/14.] Sp.: A. rubricata. Amplisca [pro: Ampelisca Kroyer 1842]. Edouard Chevreux in: Bull. Soe. zool. France, v.12 p.574. 1887. Anamixis Thomas R.R. Stebbing in:- Tr. Linn. Soe. London, ser. 2 v.7 p.35.. 1897 V. Sp.: A. hanseni. Andania Axel Boeck in: Forh. Selsk. Christian., 1870 p.128. 1871. Sp.: A. abyssi, A. nordlandica. Andaniella G.O.Sars, Crust. Norway, v. 1 p-210. 1891. Sp.: A. pectinata. Andaniexis pro: Andania A. Boeck 1871. T.R.R.Stebbing in: Tierreich, v.21 p- 94. 1906 KX. Andaniodes [pro: Andaniotes T. Stebbing 1897]. J. Vietor Carus in: Zool. Anz,, Bibliogr. v.2 p.622. 1897 XI 29. Andaniopsis G. 0. Sars, Crust. Norway, v.1 p.208. 1891. Sp.: A. nordlandica, Andaniotes Thomas R. R, Stebbing in; Tr. Linn. Soe. London, ser. 2 v.7 p. 50. 1897 V. Sp.: A. corpulentus. Anisopus Robert Templeton in: Tr. ent. Soe. London, v.1 p.185. 1836. Sp.: A. dubius. 50* 788 Anonyx Henrik Kröyer in: Danske Selsk. Afh., v.7 p. 242. 1838. Sp.: A. vahlii, A. lagena, A. appendiculosus. „Af a priv. og ovuf, Negl“. Aora Henrik Kreyer in: Naturh. Tidsskr., ser.2 v.1 p.328, 335. 1845. Sp.: A. typica. „Navnet paa en Nymfe“. Aoroides Alfred O. Walker in: Tr. Liverp. biol. Soe., v.12 p.284. 1898. Sp.: A. columbiae. Apherusa Alfred O.: Walker in: Ann. nat. Hist., ser. 60.8 p.83. 1891. [Sp.: Pherusa jurinii.] Apocrangonyx Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser, 2 v.7 p.422. 1899 V. Sp. typ.: A. lucifugus. Araneops Achille Costa in: Rend. Soe, Borbon., n. ser. 0.2 p.169, 171. 1853. Sp.: A. diadema, A. brevicornis. Argissa Axel Boeck in: Forh. Selsk. Christian., 1870 p.125. 1871. Sp.: A. typica. Aristias Axel Boeck in: Forh. Selsk. Christian, 1870 p. 106. 1871. Sp.: A. tumidus. Arrhis pro: Aceros A. Boeck 1861. T. R. R. Stebbing in: Tierreich, v.21 p. 248. 1906 IX. „Aßpıs, without nose*. Asope Ü. S. Rafinesque, Anal. Nat., p.101. 1815. [nom. nud.] Aspidophoreia William A. Haswell in: P. Linn. Soc. N. S. Wales, ».5 p. 101. 1880. Sp.: A. diemenensis. Aspidopleurus G. O. Sars, Crust. Nor- way, v.1 p.203. 1891. Sp.: A. gibbosus, ? Stegocephalus kessleri. Astyra Axel Boeck in: Forh. Selsk. Christian., 1870 p.133. 1871. Sp.: A. abyssi. Atyloides Thomas R. R. Stebbing in: Rep. Voy.Challenger, v.29 p.913. 1888. Sp.: A. australis, A. assimilis, A. serrati- cauda. Atylopsis Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.924. 1888. Sp.: A. magellanicus, A. dentatus, A. emarginatus. Atylus William Elford Leach, Zool. Mise., ©.2 p.21. 1815. Sp.: A. carinatus. Audouinia (A. Costa in:) F.G. Hope, Cat. Crost. Ital., p.24. 1851. Sp.: A. acherusica. [nom. nud.] Nomenclator generum et subgenerum Audulla Ed. Chevreux in: M&m. Soe. zool. France, v.14 p.431. 1901. Sp.: A. chelifera. „Anagramme de Alluaud*“. Autonoe Ragnar M. Bruzelius in: Svenska Ak. Handl., n. ser. &.3 nr.l p-23. 1859. Sp.: A. punctata, A. ano- mala, A. grandimana, A. erythroph- thalma, A. longipes, A. macrony&. „En dotter af Nereus och Doris“, Axelboeckia pro: Boeckia G. O. Sars 1894. Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.423. 1899 V. „in honour of the late Axel Boeck“. Bactrurus William Perry Hay in: P. U. S. Mus., 0.25 p.430. 1902 IX 23. Sp.: Crangonyx mucronatus. Baikalogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 v.7 p.425. 1899 V. Sp.typ.: B. pullus. „alludes to Lake Baikal“. Barentsia Thomas R. R. Stebbing in: Bijdr. Dierk., v.17/18 p.25. 1894. Sp.: B. hoeki. „Willem Barents“. Batea Fritz Müller in: Ann. nat. Hist., ser.3 v.15 p.276. 1865. Sp.: B. catha- rinensis. Bathymedon G.O.Sars, Crust. Norway, v.1 p.332. 1892. Sp.: B. longimanus, B. saussurei, B. obtusifrons. Bathyonyx Fr. Vejdovskyin: SB. Böhm. Ges., 1905 nr.28 p.2. 1905. Sp.: B. devismesi. r Bathyporea [pro: Bathyporeia Lindström 1856]. ©. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.271. 1857. Bathyporeia G. Lindström in: Öfy. Ak. - Förh., #.12 p.59. 1855. Sp.: B.pilosa. Bellia U. Spence Bate in: Ann. nat. Hist., ser.2 v.7 p.318. 1851. Sp.: B.arenaria. Biancolina Antonio Della Valle in: F. Fl. Neapel, v.20 p.562. 1893. Sp.: B. algicola. „in omaggioalsig. S. Lobianco*“. Bircenna Charles Chilton in: Tr. N. Zealand Inst., v.16 p.264, 265. 1884 V. Sp.: B. fulvus (B. fulva). Boeckia A..W. Malm in: Öfv. Ak. Förh., v.27 p.543. 1871. Sp.: B. typica. Boeckia ([0.] Grimm in MS.) G.O. Sars in: Bull. Ae. St.-Pötersb., ser. 5 v.1 p.182. 1894. Sp.: B. spinosa. „the name of... Boeck“. -Callisoma Oronzio - Gabriele a Se eh We ee u ’ is "Bonnierella Ed. Chevreux in: Rösult. Camp. Monaco, v.16 p.97. 1900. Sp.: ‚B. abyssi. „Jules Bonnier*. Boruta L. Wrzesniowski in: Pam. Fi- zyjogr., v.8 p.264. 1888. Sp.: B.tene- brarum. Bosecia [pro: Melita Leach 1813/14]. [Wil- liam Elford Leach in:] Edinb. Ene., 0.7 p.435. [1813/14.] Bouvierella Ed. Chevreux in: Rösult. Camp. Monaco, v.16 p.70. 1900. Sp. | typ.: B.carcinophila. „E.L.Bouvier“, Bovallia Georg Pfeffer in: Jahrb. Ham- burg. Anst., 0.5 p:95. 1888. Sp.: B. gigantea. Brachyuropus Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p. 424. 1899 V. Sp.: B. grewingki, B. reichertii. „alludes to the shoriness of the third uropods“. Brandtia C. Spence Bate, Cat.. Amphip. Brit. Mus., p. 129. 1862. Sp.: B. la- tissima. Bruzelia Axel Boeck in: Forh. Selsk. Christian., 1870 p.149. 1871. Sp.: B. typica. Bruzeliella A. M. Norman in: Ann. nat. Hist.,. ser.7 v.16 p.83. 1905 VII. Sp. typ.: B. falcata. Byblis Axel Boeck in: Forh. Selsk. Christian.,. 1870 p.228. 1871. Sp.: B. gaimardi. Callimerus T. R. R.Stebbing in: Ann. nat. Hist., ser. 4 v. 18 p. 445. 1876. Sp.: ©. acudigitata. Calliope (Leach in MS.) ©. Spence Bate in: Rep. Brit. Ass., Meet.25 p.58. 1856. Sp.: C. leachii. Calliopius pro: Calliope Bate 1856. Wil- liam Lilljeborg in: N. Acta Soc. Up- sal., ser.38 ©.6 nr.1 p.18 (tabella), 19. 1865. Costa, Fauna Reg. Napoli, Crost., Cat. p.5. [1840.] Sp.: ©. punctata. [nom. nud.] Callisoma Achille Costa, Fauna Reg. Napoli, fasec. Marz. 1851 p.1. 1851. Sp.: ©. punctatum, C. hopei. „xakoc pulcher bello, e owua. corpus corpo*. Camacho Thomas R. R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1178. 1888. Sp.: ©. bathyplous. „from a per- sonage mentioned in Don Quixote*. Nomenclator generum et subgenerum 789 Cancer Carolus Linnaeus, Syst. Nat., ed.10 p.344, 625. 1758. Sp.: ©. cur- sor, C. raninus, C. mutus, ©. minutus, C. ruricola, C. vocans, 0. craniolaris, C. philargius, ©. rhomboides, C. macu- latus, ©. pelagicus, C. nucleus, C. lacta- tus, C. maenas, C.depurator, C. feriatus, C. granulatus, ©. pagurus, ©. chabrus, C. araneus, C. cuphaeus, Ü. muscosus, ©. personatus, ©. maja, C. longimanus, C. horridus, C. eristatus, ©. supereciliosus, ©. cornutus, C, longipes, ©. spinifer, C. eruentatus, C. hepaticus. C. calappa, ©. grapsus, ÜO. aeneus, ©. punctatus, C. dorsipes, ©. symmysta, Ü. bernhardus, ©. diogenes, C. gammarus, C. astacus, C. careinus, C. pennaceus, Ü. squilla, ©. crangon, C. carabus, C. cancharus, (. pilosus, C. norvegieus, O. homarus, Ü. arctus, C. mantis, C. seyllarus, ©. pulex, C. locusta, ©. salinus, C. stagnalis. Cardenio Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.806. 1888. Sp.: C. paurodactylus. „Ihe generic name is taken from a character in Don Quixote*. Cardenis [pro: Cardenio T. Stebbing 1888]. Cecil Warburton in: Zool. Ree., v.25 Crust. p.18. 1890. Cardiophilus G. O. Sars in: Bull. Ac. St.-Pötersb., ser.5 v.4 p. 474. 1896. Sp.: ©. baeri. Caridophilus [pro: Cardiophilus O. Sars 1896]. J. V. Carus in: Zool. Anz,, Regist. 16—20 p.89. 1899. Carinogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 v.7 p.429. 1899 V. Sp.: ©. cinnamo- meus, C. wagii, ©. pulchellus, ©. seid- litzii. C. rhodophthalmus, C. caspius, C. atchensis, ©. subcarinatus, ©. fluvia- tilis, ?C. macrophthalmus, ?C. mucro- natus. Carolobatea Thomas R.R. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.208. 1899. Sp. typ.: Halimedon schneideri. „in recollection of the late Charles Spence Bate“. Ceina Antonio Della Valle in: F. Fl. Neapel, v. 20 p. 530. 1895. Sp.: €. egregia. „‚derivato con una leggiera trasposizione di lettere dal primitivo Nicea“. Centromedon G.O.Sars, Crust. Norway, v.1 p.99. 1891. Sp. typ.: CO. pumilus 790 Nomenclator generum et subgenerum Ceradocus Achille Costa in: Rend. Soe. | Borbon., n. ser. v.2 p.170, 177. 1853. Sp.: C. orchestiipes. Cerapodina [Henri] Milne Edwards, Hist. nat. Crust., v.3 p.62. 1840. Sp.: ©. abdita. Cerapopsis Antonio Della Valle in: F. Fl. Neapel, v.20 p. 356, 388. 1893. Sp.: (©. longipes. Cerapus Thomas Say in: J. Ac. Philad., v.1ı p.49. 1817 VIII. Sp.: ©. tubularis. „kepog, a horn, and tous, a foot“. Chareotia Ed. Chevreux in: Bull. Soc. zool. France, v. 30 p. 163. 1906I 31. Sp.: ©. obesa. ‚Dr. Chareot‘“. Cheirimedon Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 638. 1888. Sp.: ©. crenatipalmatus. ,xeip, the hand, and uedwv, a lord“*. Cheiriphotis Alfred OÖ. Walkerin: Herd- man, Rep. Ceylon Pearl Fish., v. 2 p: 234, 283. 1904. Sp.: C. megacheles. Cheirocratus Alfred Merle Norman in: . Nat. Hist. Tr. Northumb., ®. 1 p. 12. 1867. Sp.: CO. mantis. „xeip and xparew, strong in the hand“. Chelura A. Philippi in: Arch. Naturg., v.51 p.120. 1839. Sp.: C. terebrans. Chevalia Alfred O. Walker in: Herd- man, Rep. Ceylon Pearl Fish., v. 2 p. 234,288. 1904. Sp.: CO. aviculae. Chevreuxius Jules Bonnier in: Ann. Univ. Lyon, v. 26 p. 663. 1896. Sp.: ©. grandimanus. Chiltonia Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser.2 ©.7 p.397, 408. 1899 V. Sp.: C. mihiwaka. „in eompliment to Dr. Charles Chilton“. Chimaeropsis Fr. Meinert in: Udb. Hauchs, v.3 p.167. 1890. Sp.: C.danica. Chironesimus G.O.Sars, Crust. Norway, v.1 p.108. 1891. Sp.: ©. debruymii. Chloris William A. Haswell in: Ann. nat. Hist., ser.5 ©.5 p.33. 1880. Chosro&s Thomas R. R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1208, 1888. Sp.: C. ineisus. „An Armenian King“. Cleippides Axel Boeck in: Forh. Selsk. Christian., 1870 p.201. 1871. Sp.: €. tricuspis. Cleonardo Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.959. 1888. Sp.:. ©. longipes, Tritropis appendieu- lata. „from a personal name in Don Quixote*. Colomastix Adolph Eduard Grube, Ausfl. Triest, p.125, 137. 1861. Sp.: C. pusilla. Concholestes G. M. Giles in: J. Asiat. Soc. Bengal, v.57 p.237. 1888 X 10. Sp.: ©. dentalii. Constantia B. N. Dybowsky in: Ho- rae Soc. ent. Ross., ®.10 suppl. p. 186. 1874. Sp.: ©. branickiü, C. b. var. alexandri. Coremapus A. M. Norman in: Ann. nat. Hist., ser. 7 v.16 p.78. 1905 VII. Sp. typ.: ©. versiculatus. „xöpnua, a brush, and moUc, a foot“. Corophia [pro: Corophium Latreille 1806]. H.Milne-Edwardsin: Ann. Sei. nat., v.20 p.384. 1830. Corophium P.A. Latreille, Gen. Crust. Ins., v.1 p.58. 1806. Sp.: ©. longicorne. Corophrium [pro: Corophium Latreille 1806]. [William Elford Leach in:] Edinb. Ene., v.7 p.432. [1813/14.] Costantia [pro: Constantia B. Dybowsky 1874]. B. N. Dybowsky in: Horae Soe. ent. Ross., v.10 suppl. p.50. 1874. Crangonyx C. Spence Bate in: P. Dublin Univ. zool. bot. Ass., ©.1 p.237. 1859. Sp.: C.subterraneus. „kpayyWwv and vbE“. Cratippus Ü. Spence Bate, Cat. Amphip. Brit. Mus., p.275. 1862. Sp.: ©. tenuipes. Cratophium James D. Dana in: Amer. J. Sei., ser.2 v.14 p.309. 1852XI. — James D. Dana in: U.S. expl. Exp., v.1311 p.832, 840. [1853.] Sp.: ©. vali- dum, ©. orientale. Cressa Axel Boeck in: Forh. Selsk. Christian., 1870 p.145. 1871. Sp.: ©. schigdtei, ©. minuta. Ctenacanthus W. Garjajeff in: Trudui Kazan. Univ., 0.35 nr.6 p.15. 1901. Sp.: ©. ruber, C. roseus, ©. carpenterii, C. wagiüi, CO. cabanisi, C. ziehkowiezüi, C. radoszkowskii. Cuvieria [pro: Leucothöe Leach 1813/14]. [William Elford Leach in:] Edinb. Enc., v.7 p.435. [1813/14.] Cychreus ©.S. Rafinesque, Anal. Nat., p-101. 1815. [nom. nud.] : Cyclocaris Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.664. 1888. Sp.: ©. tahitensis. „from xUxkog, a cirele, and xdpa, head“. Cymadusa [Subgen.?] Jules-Cesar Sa- vigny, M&m. An.s. Vert., v.1 p.109. 1816I. Sp.: C. filosa. Cymothoa Joh. Christ. Fabrieius, Ent. syst., 0.2 p.503. 1793. Sp.: C. para- doxa, C. imbricata, C. falcata, U. asilus, Ü. guadeloupensis, Ü. oestrum, (©. ento- mon, O. aquatica, C.marinus, CO. linearis, C. chelipes, ©. bicaudata, C. scopulorum, C. americana, C. psora, C. physodes, ©. spinosa, (©. acuminata, ©. emarginata, ©, albicornis, C. ceti, C. oceanica, Ü. serrata, Ü. assimilis. Cyphocaris (Lütken in MS.) Axel Boeck in: Forh. Selsk. Christian., 1870 p. 103. 1871. Sp.: ©. anonys. Cypridoidea pro: Cyproidea Haswell [1880]. Edward CUaldwell Rye in: Zool. Ree., v.16 Index p.4. 1881. Cyproidea [pro: Cyproidia Haswell 1879]. William A. Haswell in: Ann. nat. Hist., ser.5 v.5 p.31. 1880. Cyproidia William A. Haswell in: P. Linn. Soe. N. S. Wales, v.4 p.820. 1879. Sp.: ©. ornata, C. lineata. Cyrtophium James D. Dana in: Amer. J. Sci., ser.2 v.14 p.309. 1852XI. — James D. Dana in: U.S. expl. Exp., v.131 p.831, 839. [1853]. Sp.: ©. orientale. Danaia Ü. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.137. 1857. Sp.: D. dubia. Darwinea Ü. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.58. 1856. Sp.: D. compressus. [nom. nud.] Darwinia [pro:. Darwinea Bate 1856]. 0. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.141. 1857. Sp.: D. com- pressa. Dautzenbergia Ed. Chevreux in: Rösult. Camp. Monaco, v.16 p.73. 1900. Sp.: D. grandimana. „Dautzenberg“. Dereothoe James D. Dana in: Amer. J. Sci., ser.2 v.14 p.313. 1852XI. — James D. Dana in: U.S. expl. Exp., Nomenclator generum et subgenerum 791 v.131 p.911, 968. [1853.] Sp.: D. emissitius, D. speculans, ?D. hirsuti- cornis. „depkw, to look“. Dermophilus Edouard van Beneden & Emile Bessels in: Möm. eour. Ac. Belgique, v.34 nr.4 p.26. 1870. Sp.: D. lophii. Desmophilus [pro: Dermophilus E. Beneden & Bessels 1870]. Thomas H. Huxley, Man. Anat. Invert., p- 367. 1877. Dexamene pro: Dexamine Leach 1813/14. L. Agassiz, Nomenel. zool., Index p.121. 1846. Dexamine [William Elford] Leach in: Edinb. Ene., 2.7 p.432. [1813/14.] Sp.: D. spinosa. Dexiocerella William A. Haswell in: P. Linn. Soc. N. S. Wales, v.10 p. 107. 1885 VI. Sp.: D. dentata, D. lobata, D. laevis. Dikerogammarus ThomasR.R.Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.428. 1899 V. Sp.: D. macrocephalus, D. haemobaphes, D. grimmi, D. ver- reausxii, D. fasciatus. „alludes to the two horn-like elevations on the pleon“. Dinoa C. S. Rafinesque, Anal. Nat., p.101. 1815. [nom. nud.] Driope [pro:.Dryope Bate 1862]. C. Spence Bate, Cat. Amphip. Brit. Mus., t. 47. 1862. Dryapoides [pro: Dryopoides T. Stebbing 1888]. Cecil Warburton in: Zool. Ree., v.25 Crust. p.19. 1890. Dryope C. Spence Bate, Cat. Amphip. Brit. Mus., p.276. 1862. Sp.: D. irro- rata, D. crenatipalma. Dryopoides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 1145. . 1888. Sp.: D. westwoodi. „Dryope ... and eidog, likeness*. Dulichia Henrik Kroyer in: Naturh. Tidsskr., ser.2 v.1 p.512, 521. 1845. Sp.: D. spinosissima. „doArgog (lang)“. Dybowskia W. Garjajeff in: Trudui Kazan. Univ., v.35 nr.6 p.16. 1901. Sp. & Subsp.: D.viridis, D. dryshenkii, D. meyerü, D. armata, D. a. var. ongureni, D. grubi, D. kessleriü; .D. k. var. europeus, D.brandti, D. cancellus, D. c. var. gerstfeldtii, D. cancelloides. 792 Dyopedos C. Spence Bate in: Ann. nat. Hist., ser. 2 v. 19 p. 150. 1857. Sp.: D. porrectus, D. falcatus. Echinogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 v.7 p.428. 1899 V. Sp.: E. berilloni, E.verrucosus, E.maackii, E.ochotensis, E. saphirinus, E. czerskü, E. lividus, E. viridis, E. eyaneus, E. testaceus, E sophiae, E. fuscus, E. murinus, E. aheneus, E. sarmatus, E. capreolus, E. uzzolzewiüi, E. stenophthalmus, E. scha- manensis, E. leptocerus, E. toxophthal- mus, E. vittatus, E. petersiü, E. viola- ceus, E.ibex, E.parvexii, E.polyarthrus, ?Gammarus mutilus. „alludes to the numerous spines on the body“. Egidia Achille Costa in: Rend. Soc. Borbon., n. ser. v.2 p.170, 172. 1853. Sp.: E. pulchella. Eiscladus C. Spence Bate & J.O. West- wood, Brit. sess. Crust., v. 1 p. 411. [1862 XI 1.] Sp.: E. longicaudatus. „Eis one, KxAadog branch“. Elasmopus Achille Costa in: Rend. Soe. Borbon., n.ser. v.2 p.170, 175. 1858. Sp.: E. rapax. Enone A.Risso, Hist. nat. Eur. mörid., v.5 p. 96. 1826. Sp.: E. punctata. Ephipphora [pro: Ephippiphora White 1847]. J. D. Dana in: Amer. J. Sei., ser.2 v.8 p.428. 1849 XI. Ephippiphora Adam White in: P. zool. Soe. London, v.15 p.124. 1847 [XI 10]. Sp.: E. kroyeri. Epidesura Axel Boeck in: Forh. Skand. Naturf., Mode8 p.659. 1861. Sp. typ.: Amphithoe compressa. Epimeria (A. Costa in:) F. G. Hope, Cat. Crost. Ital., p.46. 1851. Sp.: E. trieristata. Eratea C. S. Rafinesque, Anal. Nat., p-101. 1815. [nom. nud.] Erichthonius [pro: Eriethonius H. Milne Edwards 1830]. Hermann Burmeister, Handb. Naturg., p. 569. 1837. Erichtonius [pro: Eriethonius H. Milne Edwards 1830]. [Hippolyte] Lucas in: Hist. An. artie., Crust. Arach. Myr. p. 231. 1840. ! ErietHonius H. Milne Edwards in: Ann. Sei. nat., v.20 p.382. 1830. Sp.: E. difformis. Nomenelator generum et subgenerum Eriopis Ragnar M. Bruzeliusin: Svenska Ak. Handl., n. ser. 0.3 nr. 1 p.37, 64. 1859. Sp.: E. elongata. „En dotter af Jason och Medea“, Eriopisa pro: Eriopis R.M. Bruzelius 1859. Thomas R, R. Stebbing in: Ann. nat. Hist., ser. 6 v.5 p.193. 1890. Eriopsis pro: Eriopis R.M. Bruzelius 1859. August Wrzesniowski in: Z. wiss. Z00l., v.50 p. 632. 1890 X 10. Euandania Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 206. 1899. Sp. typ.: Andania gigantea. Euerangonyx Thomas R.R.Stebbing in: Tr. Linn. Soe. London, ser. 2 0.7 p. 423. 1899 V. Sp.: E. mucronatus, E. vejdovskyi, E. packardü, E. gracilis, E. antennatus. Euonyx Alfred Merle Norman in: Rep. Brit. Ass., Meet. 36 p.197, 202. 1867. Sp.: E. chelatus, Eurymera Georg Pfeffer in: Jahrb. Hamburg. Anst., 0.5 p.102. 1888. Sp.: E. monticulosa. Euryporeia pro: Eurytenes W. Lilljeborg 1865. G.O. Sars, Crust. Norway, v.1 p. 85. 1891. Eurystheus C. Spence Bate in: Brit. Ass., Meet. 25 p. 58. E. tridentatus. [nom. nud.] Rep. 1856. Sp.: Eurystheus (©. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.148. 1857. Sp.: E. tridentatus. Eurytenes William Lilljeborg in: N. Acta Soc. Upsal., ser.3 ©.6 nr.1 p.11. 1865. Sp.: E. magellanicus. „elputevng, which signifies widely stretched“. Eurythenes [pro: Eurytenes W.Lilljeborg 1865]. (S. I. Smith in:) Samuel H. Scudder, Nomencel. zool., suppl. L. p- 1385. 1882. Eurytheus [pro: Eurystheus Bate 1857]. Augustus de Marschall, Nomenel. zool., p.409. 1873. Eusinus [pro: Eusirus Kroyer 1845]. Augustus de Marschall, Nomenel. zool., p.409. 1873. Eusirogenes T. R. R. Stebbing in: Tr. Linn. Soe. London, ser.2 v.10ı p.13, 15. 1904 XI. Sp.: E. dolichocarpus. T en Yard re re ey ein u a ne 2” L r EUR Nomencelator generum et subgenerum Eusiroides Thomas R.R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 969. 1888. p-: E. caesaris, E. pompeüi, E. crassi, ? Atylus monoculoides, ? A. lippus. Eusiropsis Thomas R. R. Stebbing in: Tr. Linn. Soc. London. ser. 2 v.7 p. 39. 1897 V. Sp.: E. riisei. Eusirus Henrik Kreyer in: Naturh. Tidsskr., ser.2 v.1 p.501, 511. 1845. Sp.: E. cuspidatus. „Euoeipog, en Sen af Poseidon og Okeaniden Idothea“. Exoediceros Thomas R. R. Stebbing in: Ann. nat. Hist., ser. 7 v.4*p. 208. 1899. Sp. typ.: Oedicerus fossor. Exunguia (Alfred Merle Norman in:) George Stewardson Brady & David Robertson in: Ann. nat. Hist., ser 4 v.3 p.859. 1869. Sp.: E. stilipes. „ex and unguis, without a nail“. Galanthis Ü©. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.57. 1856. Sp.: @. lubbockiana. Gallea Alfred O. Walker in: Herdman, Rep. Ceylon Pearl Fish., v. 2 p.232, 256. 1904. Sp.: @. teeticauda. „From the port of Galle“. Gammaracanthus C. Spence Bate, Cat. Amphip. Brit. Mus., p.201. 1862. Sp.: @. loricatus, G. mueronatus, G. ma- crophthalmus. Gammarella ©. Spence Bate in: Ann. nat. Hist., ser. 2 v. 19 p.143. 1857. Sp.: @. orchestiformis. Gammarellus [Subgen.] Johann Friedrich Wilhelm Herbst, Naturg. Krabben Krebse, v.2 p.106. 1795. Sp.: Cancer (@.) setiferus, C©. (G.) chinensis, C. (@.) pedatus, ©. (G.) armiger, ©. (G.) ocula- tus, C. (@.) bipes, C. (@.) trixapus, C. (@.) homari, C. (G.) harangum, (. flexuosus, ©. (G.) ampulla, C. (@.) nu- gax, C©.(@.) paludosus, ©. (G.) podurus, ©. (@.) mutilus, ©. (@.) stagnalis, CO. (@.) grossipes, ©. (@.) cancellus, 0. (@.) locusta, ©. gammarellus, C. (G.) pulex, C. (@.) arenarius, C. (@.) crassicornis, ©. (@.) strömianus, (©. (@.) spinicarpus, ©. (G@.) sedentarius, ©. (G.) eicada, ©. (@.) serratus, ©. (G.) medusarum, ©. (@.) eorniger, ©. (G.) abyssinus, C. (6) . linearis, ©. (G.) ventricosus. r% 793 Gammaropsis [Subgen.] V. [Wilhelm] Liljeborg in: Vetensk. Ak. Handl., 1853 p. 455. 1855. Sp.: Gammarus erythrophthalmus, @. anomalus, @.lon- gipes, G@. macrony«. Gammarus Io. Christ. Fabrieius, Syst. Ent., p. 418. 1775. Sp.: @. locusta, @G. pulex, @. linearis, G. salinus, @. stagnalis. Forh. Selsk. Sp.: @. Gitana Axel Boeck in: Christian., 1870 p.132. 1871. sarsi, @. rostrata. Gitanopsis G. O. Sars, Crust. Norway, v.1 p.223. 1892. Sp.: @. bispinosa, @G. inermis, @. arctica. Glauconome Henrik Kreyerin: Naturh. Tidsskr., ser.2 v.1 p.491, 501. 1845. Sp.: G. leucopis. „En af Nereiderne“. Glycera William A. Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.256, 322. 1879. Sp.: @. tenwicornis. Glycerina William A. Haswell, Cat. Austral. Crust., p.233. 1882. Sp.: @. tenuicornis. „Altered from Glycera*. Gmelina ([O.| Grimm in MS.) G. ©. Sars in: Bull. Ace. St.-Pötersb., ser. 5 v.1 p.191. 1894. Sp.: @. costata, @. kusnezowi. Gmelinopsis G. 0. Sars in: Bull. Ace. St.- Pötersb., ser.5 v.4 p.434. 1896. Sp.: @. tuberculata, @. aurita. Goesia Axel Boeck in: Forh. Selsk. Christian., 1870 p.231. 1871. Sp.: @. depressa. Goplana [August] Wrzesniowski in: Zool. Anz., v.2 p.299. 1879 V19. Sp.: @. polonica, @. ambulans. „In pol- nischer Sprache bezeichnet Goplana eine Wasser-Nympbe“. Gossea Ü. Spence Bate (& J. O. West- wood), Brit. sess. Orust., v. 1 p. 276. [1862 IV 1.] Sp.: @. mierodentopa. „in compliment to Mr. Gosse“. Grandidierella H. Couti®re in: Bull. Soe. philom., ser. 9 v. 6 p. 166. 1904. Sp.: @. mahafalensis. Graya [pro: Grayia Bate 1862]. C. Spence Bate, Cat. Amphip. Brit. Mus., t. 14a, 16. 1862. 794 Grayia Ü. Spence Bate (& J. O. West- wood), Brit. sess. Crust., v.1 p.15l. [1862 I 1.] Sp.: @. imbricata. „in compliment to Dr. J. E. Gray“. Grimaldia Ed. Chevreux in: Bull. Soe. zool. France, v.14 p.283. 1889, Sp.: G. armata. „Grimaldi“. Grubia Voldemarus Czerniavski in: Syezda Russ. Est., Syezdal Zool. p. 103. 1868. Sp.: @. taurica. „Dedicata cel. A. E. Grubio“. Guerina pro: Guerinia A. Costa 1853, Antonio Della Valle in: F. Fl. Neapel, v.20 p.775. 1893. Guerinella pro: Guerinia A. Costa 1853. Ed. Chevreuxin: Bull. Mus. Monaco, nr.85 p.[7]. 1905 V 5. Guerinia (Hopein MS.) Achille Costa, Deser. 3 Crost. dal Hope, p. 3. 1853. Sp.: @. nicaeensis. Helleria A. M. Norman Bull. 1887. Guernea pro: 1868. Edouard Chevreux in: Soc. zool. France, v.12 p. 302. „Jules de Guerne‘. Gulbarentsia pro: Barentsia T. Stebbing 1894. Thomas R. R. Stebbing in: Bijdr. Dierk., v.17/18 p.2. 1894. Hakonboeckia Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.425. 1899 V. Sp.typ.: H. strauchü. „in eompliment to Hakon Boeck“. Halibrotus pro: Alibrotus H. Milne Ed- wards 1840. L. Agassiz, Nomenel. zool., Index p. 14,171. 1846. Halice Axel Boeck in: Forh. Selsk. Christian., 1870 p.152. 1871. Sp.: H. abyssi, H. grandicornis. Halicoides Alfred O. Walker in: Ann. nat. Hist., ser. 6 v. 17 p. 344. 1896. Sp.: H. anomala. Halicreion Axel Boeck in: Forh. Selsk. Christian., 1870 p.173. 1871. Sp.: H. longicaudatus. Halierion[pro: Halicreion A. Boeck 1871]. Eduard von Martens in: Zool. Reec., v.8 p.190. 1873. Halimedon Axel Boeck in: Forh. Selsk. Christian., 1870 p.169. 1871. Sp.: H. molleri, H. saussurei, H. longimanus, H. brevicalcar. Nomenclator generum et subgenerum Halirages Axel Boeck in: Forh. Selsk, Christian., 1870 p.194. 1871. Sp.: H. bispinosus, H. borealis, H. tridentatus, H. fulvoeinetus. Haliragoides G. O. Sars, Crust. Norway, v.1 p.432. 1893. Sp.: H. inermis. Halirhages[pro: Halirages A. Boeck 1871]. Anton Stuxberg in: Bih. Svenska Ak., v.5 nr.22 p.64. 1880. Haplocheira William A. Haswell in: P. Linn. Soe. N.S. Wales, v. 4 p. 273. 1879. Sp.: H. typica. Haplochira pro: Haplocheira Haswell 1879. Eduard von Martens in: Zool. Ree., v.16 Crust. p.32. 1881. Haplonyx [pro: Hoplonyx O. Sars 1891]. [Alfred Merle] Norman in: Ann. nat. Hist., ser.7 v.5 p.209, 211,212. 1900 IL Haploops [William] Liljeborg in: Öfv. Ak. Förh., v.12 p.135. 1855. Sp.: H. tubicola, H. carinata. Harmomia [pro: Harmonia Haswell 1879]. William A. Haswell in: P. Linn. Soe. N.S. Wales, v.4 p. 330. 1879. Harmonia William A. Haswell in: P. Linn. Soc. N.S.Wales, v.4 p.330, 349. 1879. Sp.: Harmomia crassipes (Har- monia c.). Harpina Axel Boeck in: Forh. Selsk. Christian., 1870 p.135. 1871. Sp.: H. plumosa, H. crenulata. Harpinia pro: Harpina A. Boeck 1871. Axel Boeck, Skand. Arkt. Amphip., v.2 p.218. 1876. „Apmwvıa (et graesk Kvindenavn)“. Harpinioides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 936. 1888. Sp.: H. drepanocheir. „Har- pinia, Boeck, and eidog, likeness“. Harpinoides [pro: Harpinioides T. Steb- bing 1888]. Ceeil Warburton in: Zool. Ree., 0.25 Crust. p.19. 1890. Haustorius P. 1. St. Müller in: Slabber, Phys. Belustig., p.48. 1775. Sp.: H. arenarius. Heiscladius [pro: Eiscladus Bate & West- wood 1862]. W.C.M’Intosh in: Ann. nat. Hist., ser.4 v.14 p.269. 1874. Heiscladus [pro: Eiscladus Bate & West- wood 1862]. Alfred Merle Norman in: Rep. Brit. Ass., Meet. 38 p.255, 259, 284. 1869. Nomenelator generum et subgenerum 795 Hela Axel Boeck in: Forh. Skand. Naturf., Mode8 p.668. 1861. Sp.: H.monstrosa. Helella[pro: Hela A.Boeck 1861]. (Smith in MS.) G. O. Sars in: Forh. Selsk. Christian., 1882 nr. 18 p.31. 1882. Helleria Alfred Merle Norman in: Ann. nat. Hist., ser.4v.2 p.418. 1868. Sp.: H. coalita. „dedicated to Prof. Heller“. Heterogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 v.7 p.429. 1899V. Sp.: H. stanislavii, H. sophianosü, H.capellus, H.ignotus, H. flori, H. bifasciatus, H. branchialis, H. albulus. „alludes to the character of the genus as a second self to Gam- marus“. Hippias C.S. Rafinesque, Anal. Nat., p. 101. 1815. [nom. nud.] Hippomedon Axel Boeckin: Forh. Selsk. Christian., 1870 p.102. 1871. Sp.: H. holbglli, H. abyssi. Hirondella [pro: Hirondelles« Chevreux 1889]. J. V. Carus in: Zool. Anz., Regist. 11—15 p.142. 1893. Hirondellea Ed. Chevreux in: Bull. Soc. zool. France, v. 14 p. 285. 1889. Sp.: H. trioculata. „Hirondelle“. Hoplonyx G. O. Sars, Crust. Norway, v.1 p.91. 1891. Sp.: Anonyx cicadoides, Hoplonyx eicada, H.similis, H.acutus, H. albidus, H. leucophthalmus, H. cae- eulus. Hornellia Alfred O. Walker in: Herd- man, Rep. Ceylon Pearl Fish., v.2 p.233, 268. 1904. Sp.: H.incerta. „after Mr. Jas. Hornell“. Hyale Heinrich Rathke in: Mem. pres. Ac. St.-Pötersb., v.3 p.377. 1837. Sp.: H. pontica. „nach. einer Nympfe aus dem Gefolge der Diana“. Hyalella Sidney I. Smith in: Rep. U. S. Fish Comm., v.2 p.645. 1874. Sp.: H. dentata. Hyalellopsis Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.422. 1899V. Sp. typ.: H. czyrnianski. Hyperiopsis G.O.Sars in: Norske Nord- havs-Exp., v.6 Crust.1p.231. 1885. Sp.: H. voringü. Ichnopus Achille Costa in: Rend. Soc. Borbon., n. ser. v.2 p.169, 172. 1853. Sp.: I. taurus. N Ichthyomyzocus [C. E.] Hesse in: Ann. Sei. nat., ser.5 v.17 nr.7 p.1,5. 1873. Sp.: I. ornatus, I. morrhuae, I. lophii, I. squatinae. „De ix%05, poisson ; ulZw, je suce*. Icilius James D. Dana in: Amer. J. Sei., ser.2 v.8p.140. 1849 VII. — Jacobus D. Dana in: P. Amer. Ae., v.2 p.220. 1852. Sp.: I. ovalis. Icridium [Adolph Eduard] Grube in: Jahresber. Schles. Ges., v.41 p.58. 1864. Sp.: I. fuscum. Iduna AxelBoeck in: Forh. Skand. Naturf., Mode 8 p.656. 1861. Sp.: Gammarus brevicornis, G. fissicornis (Iduna f.). Idunella G. O. Sars, Crust. Norway, v.1 p.536. 1894. Sp.: I. aegvicornis. Idurella [pro: Idunella O. Sars 1894]. R.I.Pocoekin: Zool. Rec., v.32 Urust. p.41. 1896. Ingolfiella H. J. Hansen in: J. Linn. Soc., v.29 p.118, 128. 1908 X.91, Sp.: 3: abyssi, I. littoralis. Iphigeneia pro: Iphigenella G. O. Sars 1896. ([O.] Grimm in MS.) G.O. Sars in: Bull. Ac. St.-Petersb., ser.5 ®. 4 p-478. 1896 V. Iphigenella G. O. Sars in: Bull. Ac. St.- Petersb., ser.5 v.4 p.478. 1896 V. Sp. typ.: I. acanthopoda. Iphigenia George M. Thomson in: Tr. N. Zealand Inst., v.14 p.237. 1882V. Sp.: I. typica. Iphimedia Heinrich Rathke in: N. Acta Ace. Leop., v. 201 p.85. 1843. Sp.: I. obesa. „Nach einer Geliebten Nep- tuns*. Iphimediopsis Antonio Della Valle in: F. Fl. Neapel, v.20 p.585, 933. 1893. Sp.: I. eblanae (I. geniculata). Iphinotus Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.414, 419. 1899 V. -Sp.: I. chiltoni. „from the prefix ipı-, and vortog, back“. Iphiplateia Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser.2 v.7 p.414. 1899 V, Sp.: I. whiteleggei. „from the prefix ipı-, signifying strength, and rAo-, teia, broad“. Isaea H. Milne Edwards in: Ann. Sei. nat., v.20 p.380. 1830. Sp.: I.montagui. 796 Ischyroceras [pro: Ischyrocerus Kröyer 1838]. James D. Dana in: Amer. J. Sei., ser.2 0.8 p.138. 1849 VII. Ischyrocerus Henrik Kröyer in: Danske Selsk. Afh., v.7 p.283, 287. 1838. Sp.: I. angvipes. „Af ıoxupog, staerk, og xepac, Horn“. Iscoea [pro: Isaea H.Milne Edwards 1830]. C. Spence Bate, Cat. Amphip, Brit. Mus., t.22 f.1. 1862. Isoea |pro: Isaea H. Milne Edwards 1850]. [Hippolyte] Lucas in: Hist. An. artie., Crust. Arach. Myr. p.230. 1840. Isolus C. S. Rafinesque, Anal. Nat., p.101. 1815. [nom. nud.] Janassa Axel Boeck in: Forh. Selsk. Christian., 1870 p.249. 1871. Sp.: J. variegata. Jassa [William Elford] Leach in: Edinb. Ene., ©.7 p.433. [1813/14]. Sp.: J. pulchella, J. pelagica, ? Cancer (Gam- marus) falcatus. Katius Ed. Chevreux in: Bull. Mus. Monaco, nr. 35 p.1. 1905V 5. Sp.: K. obesus. „mot arabe Kat, chat“. Kerguelenia Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.1219. 1888. Sp.: K. compacta. Kroyea [pro: Kröyera Bate 1857]. ©. Spence Bate, Cat. Amphip. Brit. Mus., t. 17. 1862. Kröyera Ü. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.140. 1857. Sp.: K. carinata. Kroyeria|pro: Kröyera Bate 1857]. Adolph Eduard Grube, Lussin, p. 72. 1864. Kuria A. O. Walker & Andrew Seott in: H. O. Forbes, Nat. Hist. Sokotra, p- 217, 228. 1903. Sp.: K. longimanus. Lada [August] Wrzesniowski in: Zool. Anz., v.2 p.322. 1879 V123. Sp.: L. chalubihskiü. „in der slavischen Mytho- logie die Liebesgöttin“. Laematophilus [pro: Laetmatophilus R. M, Bruzelius1859]. William A.Haswell in: P. Linn. Soc. N.S.Wales, v.10 p. 107, 110. 1885. Laetmatophilus Ragnar M. Bruzelius in: Svenska Ak. Handl., n. ser. v.3 nr.1 p. 10. [1859.] Sp.: L. tuberculatus. „Adituo och @PiXkoc“. Nomencelator generum et subgenerum Laetmophilus [pro: Laetmatophilus R. M. Bruzelius 1859]. Augustus de Mar- schall, Nomenel. zool., p.411. 1873. Lafystius Henrik Kreyer in: Naturh. Tidsskr., v.4 p.156. 1842. Sp.: L. sturionis. „Napuouog, gulosus“. Lalaria [Hereule Nicolet in:] Gay, Hist. Chile, v.3 p.240. 1849. Sp.: L. longi- tarsis. Lalasia [pro: Lalaria H. Nicolet 1849]. C. Spence Bate in: Ann. nat. Hist., ser.2 v.20 p.525. 1857. Lampra Axel Boeek in: Forh. Selsk. Christian., 1870 p.188. 1871. Sp.: L. gibbosa. Laotho& pro: Laothoes A. Boeck 1871. G.O.Sars, Crust. Norway, v.1 p. 453. 1893. Laothoös Axel Boeck in: Forh. Selsk. Christian., 1870 p. 202. 1871. Sp.: L. meinerti. Laphystiopsis G.O.Sars, Urust. Norway, v.1 p.386. 1893. Sp.: L. planifrons. Laphystius pro: Lafystius Kroyer 1842. L. Agassiz, Nomenel. zool., Index p- 200, 202. 1846. Leipsuropus Thomas R. R. Stebbing in: Ann. nat. Hist., ser. 7 e.3 p.241. 1899. Sp.: Cyrtophium parasiticum. „signifying an omission of a uropod“. Lemboides Thomas R. R. Stebbing in: Ann. nat. Hist., ser. 6 v.16 p.209. 1895. Sp.: L. afer. Lembos (. Spence Bate in: Rep. Brit. Ass., Meet. 25 p. 58. 1856. Sp.: L. cam- briensis, L. damnoniensis, L. versi- culatus, L. websterii. |nom. nud.?] Lembos (C. Spence Bate in: Ann. nat. Hist., ser. 2 0.19 p.142. 1857. Sp.: L. cambriensis, L. versiculatus, L. web- sterii, L. damnoniensis. Lepidaetylis Thomas Say in: J.Ae. Philad., v.lır p.379. 1818. Sp.: L dytiscus. z Lepidaetylus|pro: Lepidaetylis Say 1818]. Fr. Meinert in: Udb. Hauchs, ®. 3 p. 160. 1890. Lepidepecreum (. Spence Bate & J. O0. Westwood, Brit. sess. Crust., ©.2 p-. 509. 1868 [XII 31]. Sp.: Z. cari- natum, Anonys longicornis. Nomenelator generum et subgenerum Lepleurus C.S.Rafinesque, Ann. Nat., p-6. 1820. Sp.: L. rivularis. Leptamphopus G.O.Sars, Crust. Norway, v.1p. 458. 1893. Sp.: L. longimanus. Leptocheirus Ernestus Gustavus Zad- dach, Syn. Crust. Pruss., p.7. 1844. Sp.: L. pilosus. Leptochela Axel Boeck, Skand. Arkt. Amphip., v.2 p.190. 1876. Sp.: Opis leptochela. Leptochirus [pro: Leptocheirus Zaddach 1844]. James D. Dana in: Amer. J. Sei., ser. 2 v.8 p.137. 1849 VIL. Leptophoxus G@.O. Sars, Crust. Norway, v.1 p.146. 1891. Sp.: L. falcatus. Leptothoe William Stimpson in: Smith- son. Contr., v.6 nr.5 p.46. 1853. Sp.: L. danae. Leuceothöe [William Elford Leach in:] Edinb. Ene., v.7 p.386, 403, 432, 435. [1813/14.]Sp.: L.articulosa ( Cuvieria a.). Liljeborgia Ü. Spence Bate (& J. O. Westwood), Brit. sess. Crust., v. 1 p:202. [1862 IL 1.] Sp.: L. pallida, L. shetlandica. „in compliment to.... Professor Liljeborg“. Lilljeborgia [pro: Liljeborgia Bate 1862]. Axel Boeck in: Forh. Selsk. Christian., 1870 p.154. 1871. Lockingtonia W.G. W. Harford in: P. Calif. Ac., v.7 p.53. 1877. Sp.: L. flwialis. „dedicate...to Mr. W. N. Lockington“. Lonchomerus Ü. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.58. 1856. Sp.: L. graeilis. [nom. nud.] Lonchomerus C. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.143. 1857. Sp.: L. graeilis. Lusyta Gio. Domenico Nardo, Fauna Venet., p.20. 1847. Sp.: algensis. Lycesta Jules-Cösar Savigny, M&m. An. s. Vert., ©. 1 p. 109. 1816I. Sp.: L. Prosp. Cancer furina. Lyeianassa [pro: Lysianassa H. Milne Edwards 1830. Thomas Bell in: Belcher, Last aret. Voy., v.2 p. 406. 1855. Lysianassa H. Milne Edwardsin: Ann, Sci. nat., v.20 p. 364. 1830. Sp.: L. costae, L. chauseica. 797 Lysianassina Subgen. Achille Costa in: Annuario Mus. Napoli, v.4 p.43. 1867. Sp.: Lysianassa filicornis, L. longicornis. Lysianax pro: Lysianassa H. Milne Ed- wards 1830. Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 681, 1676. 1888, Lysianella G. O. Sars in: Forh. Selsk. Christian., 1882 nr.18 p.78. 1882. Sp.: L. petalocera. Lysianopsis S. J. Holmes«in: Amer. Natural., v. 37 p. 276. 1903IV. Sp.: L. alba. Lysita pro: Lusyta Nardo 1847. Gio. Domenico Nardo in: Mem. Ist. Yanpio, v.14 p. 283, 340. [1869]. Macleayia William A. Haswell in: Ann. nat. Hist., ser.5 v.5 p.32. 1880. Macrohectopus pro: Constantia Dybows- ky 1874. T.R.R. Stebbing in: Tier- reich, v.21 p. 394. 1906 IX. „Moaxpös, long, Extog, sixth, molc, foot“. Maera [William Elford Leach in:] Edinb. Ene., v.7 p.386,403,452,436. [1813/14.] Sp.: M. grossimana (Mülleria g.). Maeroides Alfred O. Walker in: P. Liverp. biol. Soe., v. 12 p. 282. 1898. Sp.: M. thompsoni. Maerza [pro: Maera Leach 1813/14]. [Pierre Andre] Latreille in: G. Cu- vier, R£gne an., v%.3 p.47. 1817. Megalonoura ([Alfred Merle] Norman in MS.) (A. O. Walker in:) W. A. Herdman in: P. Liverp. biol. Soc., v.3 p.39. 1889. Sp.: M. agilis. Megalorchestes J. F. Brandt in: Bull. phys.-math. Ac. St.-Pötersb., v.9 p.142. 185119. Sp.: M. californianus, ?Or- chestia longicornis. Megalorchestia [pro: Megalorchestes F. Brandt 1851]. J. F. Brandt in: Bull. phys.-math. Ace. St.-Pötersb., v.9 p.310. 1851 V31. Sp.: M. californiana, ?M. longicornis. Megaloura pro: Megaluropus [Hoek 1889]. (A. Merle Norman in MS.) P.P.C. Hoek in: Tijdschr. Nederl. dierk. Ver., ser.2 v.2 p.198. 1889 Ill. Megaluropus (A. Merle Norman in MS.) P. P. C. Hoek in: Tijdschr. Nederl, dierk. Ver., ser.2 v.2 p.197. 1889 IIT. Sp.: M. agilis. 798 Nomenclator generum et subgenerum Megamaera [pro: Megamoera Bate 1862]. C. Spence Bate, Cat. Amphip. Brit. Mus., t.39. 1862. Megamoera C. Spence Bate (& J.O. | ı Microdeuteropus pro: Microdeutopus A. Westwood), Brit. sess. Orust., vo. 1 p.400. [1862 XI1.] Sp.: M. semiser- rata, M. longimana, M. othonis, ?M. alderi, M. brevicaudata. Megamphopus Alfred Merle Norman in: Rep. Brit. Ass., Meet. 38 p. 282. 1869. Sp. typ.: M. cornutus. Melita [William Elford Leach in:] Edinb. Enc., .7 p.386,403,432,435. [1813/14.] Sp.: M. palmata (M. palmeta) (Boscia nigricans). Melite [pro: Melita Leach 1813/14]. [Pi- erre Andr&] Latreillein: G. Cuvier, Regne an., v.3 p.47. 1817. Melphidippa Axel Boeckin: Forh. Selsk. Christian., 1870 p.218. 1871. Sp.: M. spinosa, M. longipes, M. borealis. Melphidippella G. O. Sars, Crust. Nor- way, o.1 p.487. 1894. 'Sp.: M. macera. Menigrates Axel Boeck in: Forh. Selsk. Christian., 1870 p.113. 1871. Sp.: M. obtusifrons. Mesopleustes ThomasR.R.Stebbingin: Ann. nat. Hist., ser. 7 v.4 p.209. 1899. Sp. typ.: Pleustes abyssorum. Metaphoxus Jules Bonnier in: Ann. Univ. Lyon, v. 26 p. 630. 1896. Sp.: M. typicus. Metopa Axel Boeck in: Forh. Selsk. Christian., 1870 p.140. 1871. Sp.: M. clypeata, M. glacialis, M. alderi, M. bruzelii, M. affinis, M. longicornis, M. megacheir, M. longimana, M. nasuta. Metopella @. 0. Sars, Crust. Norway, v.1 p.274. 1892. Sp.: Metopa longi- mana, M. neglecta, M. nasuta. Metopina [Alfred Merle]l Norman in: Ann.nat. Hist., ser. 7 0.6 p.45. 1900 VL. Sp. typ.: Metopa palmata. Metopoides Antonio Della Valle in: F. Fl. Neapel, v.20 p. 907. 1893. Sp.: Metopa magellanica, M. parallelocheir, M. ovata, M. compacta. Microcheles Henrik Kreyer in: Naturh. Tidsskr., ser.2 v.2 p.58,66. 1846. Sp.: M. armata. Microdentopus pro: Microdeutopus A. Costa 1853. C. Spence Bate (& J. O. Westwood), Brit. sess. Crust., ®v, 1 p. 287. [1862IV 1.] Costa 1853. C. Spence Bate & J.O. Westwood, Brit. sess. Crust., v.1 p- 287. [1862IV1.] Microdeutopus Achille Costa in: Rend. Soc. Borbon., n. ser. ©.2 p. 171, 178. 1853. Sp.: M. gryllotalpa. Microjassa Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v.3 p.240. 1899. Sp.: Podocerus cumbrensis. Microplax pro: Iduna A. Boeck 1861. William Lilljeborg in: N. Acta Soe. Upsal., ser.3 v.6 nr.1 p.18 (tabella), 19. 1865. Microprotopus Alfred Merle Norman in: Rep. Brit. Ass., Meet. 36 p.197, 203. 1867. Sp.: M. maculatus. Micruropus Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p.424. 1899V, Sp.: M. puella, M. inflatus, M. vortex, M. talitroides, M. littoralis, M. glaber, M. rugosus, M. wahlii, M. fiesenii, M. perla, M. klukii, M. pachy- tus. „refers to the smallness of the third uropods“. Moera [pro: Maera Leach 1813/14]. [Henri] Milne Edwards, Hist. nat. Crust., v.8 p.54. 1840. Monoculodes William Stimpson in: Smithson. Contr., ©.6 nr. 5 p. 54. 1853. Sp.: M. demissus. Monoculopsis G.O.Sars, Crust. Norway, v.1 p.810. 1892. Sp.: M. longicornis. Montagua (. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.57. 1856. Sp.: M. ' monoculoide, M. marinus, M. pol- lexianus, M. dubius. Montaguana pro: Montagua Bate 1856. Charles Chilton in: Tr. N. Zealand Inst., v.15 p.78. 1883. Mülleria [pro: Maera Leach 1813/14]. [William Elford Leach in:] Ence., v.7 p.436. [1813/14.] Naenia [pro: Noenia Bate 1862]. ©. Spence Bate, Cat. Amphip. Brit. Mus., p.271. 1862. | Nannonyx G. O. Sars, Crust. Norway, v.1 t.24. 1890. Sp.: N. goösii. ur dal a 4 6 ee ze ya ” Si Bi: Edinb. an er un Nomencelator generum et subgenerum 799 Nemertes (jWilliam Elford] Leach in MS.) [Adam White], Crust. Brit. Mus., p. 90. 1847. Sp.: N. nesaeoides. [|nom. nud.] Neobula [pro: J. Vietor Carus in: p-291. 1880 VI 21. Neobule William A. Haswell in: P. Linn. Soc. N. S. Wales, ©. 4 p. 255. 1879. Sp.: N. algicola. Neohela pro: Hela A. Boeck 1861. S. IL Smithin: P.U.S. Mus., v.3 p.448. 1881. Neoniphargus Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser. 2. v,7 p.424. 1899V. Sp. typ.: N. thomsoni. Neopleustes T. R. R. Stebbing in: Tierreich, e.21 p. 311. 1906 IX. Sp. typ.: Amphitoe pulchella. ‚veoc, new, and Pleustes“. Nicea [Hereule Nicolet in:] Gay, Hist. Chile, v.3 p.237. 1849. Sp.: N. lucasiüi, Nieippe Ragnar M. Bruzelius in: Svenska Ak. Handl., n. ser. ©.3 nr. 1 p.37, 99, [1859]. Sp.: N. tumida. ,„.Namn pä en dotter af Pelops“. Neobule Haswell 1879]. Zool. Anz., vu. 3 Niphargoides G.O.Sars in: Bull. Ae. St.-Pötersb., ser.5 v.1 p.371. 1894 XII. Sp. typ.: N. caspius. Niphargus J. C. Schiödte in: Danske 'Selsk. Skr., ser. 5 v.2 p. 26. [1849.] Sp.: N. stygius. „Nipapyos“. Noenia C. Spence Bate (& J.O. West- wood), Brit. sess. Crust., ®. 1 p. 471. [1862 XII 1.] Sp.: N. tuberculosa, N. rimapalmata, N.excavata, N. undata, ?Gammarus spinipes. Normania Axel Boeck in: Forh. Selsk. Christian., 1870 p.119. 1871. Sp.: N. qvadrimana. Normanion pro: Normania A.Boeck 1871. Jules Bonnier in: Bull. sei. France Belgique, v. 24 p. 167. 1893 V 5. Nototropis Achille Costa in: Rend. Soe. Borbon., n. ser. v.2p.170, 173. 1853. Sp.: Notrotopis spinulicauda. Notrotopis [pro: Nototropis A. Costa 1853]. Achille Costa in: Rend. Soc. Borbon., n. ser. v.2 p.173. 1853. Odius pro: Otus Bate & Westwood 1862. William Lilljeborg in: N. Acta Soc. Upsal., ser.3 0.6 nr.1 p.18 (tabella), 19. 1865. Odontogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 0.7 p.427. 1899 V. Sp.: O. calca- ratus, O. margaritaceus. „alludes to the tooth on the fifth sideplates‘“. Oediceroides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.843. 1888. Sp.: O. rostrata (O. conspieua), O. cinderella, O. ornata. Oediceropsis William Lilljeborg in: N. ‘ Acta Soc. Upsal., ser.8 v.6 nr. 1 p.18 (tabella), 19. 1865. Sp.: O. brevicornis. Oediceros Henrik Kroyer in: Naturh. Tidsskr., v.4 p.155. 1842. Sp.: ©. saginatus. „Orldew, tumeo et xepag, eornu*. Oedicerus [pro: Oediceros Kreyer 1842]. James D. Dana in: Amer. J. Sci., ser. 2 v.8 p.138. 1849 VII. Ommatogammarus Thomas R. R.Steb- bing in: Tr. Linn. Soc. London, ser. 2 v.7 p.427. 1899 V. Sp.: O. albinus, O. flavus, O. carneolus, O. amethystinus. „alludes to curious character of the eyes“. Onesimoides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 647. 1888. Sp.: O. carinatus. „to call atten- tion to the relationship between this genus and Onesimus, Boeck“. Onesimus [pro: Onisimus A. Boeck 1871]. xel Boeck. Skand. Arkt. Amphip., v.1 t.4,5,6. 1872. Onisimus Axel Boeck in: Forh. Selsk. Christian., 1870 p.111. 1871. Sp.: ©. litoralis, O. plautus, O. edwardsii. Opis Henrik Kroyer in: Naturh. Tidsskr., v.4 p.149. 1842. Sp.: O. eschrichtii. „Nomen virginis Hyperboreae“. Opisa Axel Boeck, Skand. Arkt. Amphip., v.2 p.190. 1876. Sp. typ.: Opis typica (Opisa eschrichti). „Qmoa (en Pige hos Herodot)‘. Oradarea Alfred OÖ. Walker in: J. Linn. Soe., v.29 p.40,56. 1903 VIL 30. Sp.: O.longimana. „Ora= beach, and Adare“. Orchestes [pro: Orchestia Leach 1813/14]. [William Elford Leach in:] Edinb. Ene., v.7 p.402. [1813/14.] Orchestia [William Elford Leach in:] Edinb, Ene., v.7 p.402,432. [1813/14.] Sp.: O. littorea. 800 Orchestoidea [Hereule Nicoletin:] Gay, Hist. Chile, e.3 p.229. 1849. Sp.: O. tuberculata. Orchomena [pro: Orchomene A. Boeck 1871]. Eduard von Martens in: Zool. Reec., v.8 p.188. 1873. Orchomene Axel Boeck in: Forh. Selsk. Christian., 1870 p.114. 1871. Sp.: O. pingvis, O.serratus, O.minutus, O. goesii, O. umbo. Orchomenella G.O.Sars, Crust. Norway, v.1 p.66. 1890. Sp.: O. minuta, 0. pingvis, O. ciliata, O. groenlandica, ? Tryphosa barbatipes. Orchomenopsis G. OÖ. Sars, Urust. Nor- . way, v.1 p.73. 1891. Sp.: Orchomene musculosus, ©. abyssorum, ? 0. exca- vatus, Orchomenopsis obtusa. Orthopalame P.P.C.Hoek in: Tijdschr. Nederl. dierk. Ver., ».4 p.123. 1879. Sp.: O. terschellingi. „Von öptog (recht, gerade) und TTaAdun (palma, Palme)“. Otus ©. Spence Bate & J.O. Westwood, Brit. sess. Crust., v.1 p.223. [1862111.] Sp.: O. carinatus. „son of Iphimedia“. Palinnotus Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v.5 p.16. 1900. Sp. typ.: P. thomsoni. Pallasea C. Spence Bate, Cat. Amphip. Brit. Mus., p. 200, 380. 1862. Sp.: P. cancellus, P. cancelloides. Pallasia [pro: Pallasea Bate 1862]. Axel Boeckin: Forh. Selsk. Christian., 1870 p- 206. 1871. Pallasiella [pro: Pallasea Bate 1862]. G.O.Sars, Crust. Norway, v.1 p. 508. 1894. Pandora pro: Pandorites G. O. Sars 1895. ([0.] Grimm in MS.) G. O. Sars in: x Bull. Ace. St.-Petersb., ser.5 v.3 p. 287. 1895X. Pandorites G. O. Sars in: Bull. Ae. St.- Pötersb., ser.5 v.3 p.287. 1895X. Sp. typ.: P. podoceroides. Panoplaea [pro: Panoploea G.M. Thomson 1880. G. M. Thomson in: Tr. N. Zealand Inst., v.13 p.212. 1881. Panoploea George M. Thomson in: Ann. nat. Hist., ser.5 v.6 p.2. 1880. Sp.: P. spinosa, P. debilis. Paracalliope Thomas R. R. Stebbing in: Ann, nat. Hist., ser.7 v.4 p.210. 1899. Sp. typ.: Calliope fluviatilis. Nomenclator generum et subgenerum Paracallisoma Ed. ÖÜhevreux in: Bull. Soe. zool. France, v.28 p.84. 1903II. Sp.: P. alberti. Paraceradocus Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser.2 ©.7 p: 426. 1899 V. Sp. typ.: P. miersüi. Paracorophium Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v.3 p. 350. 1899. Sp.: Corophium excavatum. Paracrangonyx ThomasR.R. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p- 422. 1899 V. Sp. typ.: P. compactus. Paracyphocaris Ed. Chevreuxin: Bull. Mus. Monaco, nr.32 p.1. 1905 IV 15. Sp. typ.: P. praedator. Paracyproidea Thomas R. R. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p. 207. 1899. Sp. typ.: Oyproidea lineata. Paradexamine Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.210. 1899. Sp. typ.: Dexamine pacifica. Paradryope Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 1151. 1888. Sp.: .P. orguion. Paradulichia AxelBoeckin: Forh. Selsk. Christian., 1870 p.265. 1871. Sp.: P. typica. Paragrubia Ed. Chevreux in: Mem. Soc. zool. France, v. 14 p. 426. 1901. Sp.: P. vorax. Parajassa pro: Janassa A. Boeck 1871. Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 e.3 p.240. 1899. Paraleptamphopus Thomas R. R. Steb- bing in: Ann. nat. Hist., ser. 7 ».4 p- 209. 1899. Sp.: Calliope subter- ranea, Pherusa caerulea. Paraleucothoe Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v4 p.208. 1899. Sp. typ.: Lencothoe novae-hol- landiae. Parambasia A. O0. Walker & Andrew Seott in: H.O.Forbes, Nat. Hist. So- kotra, p.217,221. 1903. Sp.: P. forbesii. Paramera [pro: Paramoera Miers 1875]. (Edward J. Miers in:) Samuel H. Scudder, Nomenel. zool., suppl. L. p.247. 1882. Parametopa Ed. Cheyreux in: Bull. Soe. Rouen, v. 36 p. 233. 1901. Sp.: P. kervillei. E 4 A * Paramicruropus Thomas R.R.Stebbing in: Tr. Linn. Soc. London, ser.2 v.7 p-423. 1899V. Sp.: P. solskii, P. tac- zanowsküi. Paramoera Edward J. Miers in: Ann. nat. Hist., ser.4 v.16 p.75. 1875. Sp.: Melita fresnelii, M. tenwicornis, Para- moera australis. Paramphithoe Ragnar M. Bruzelius in: Svenska Ak. Handl., n.ser. &.3 nr.1 p. 87, 68. 1859. Sp.: P. panopla, P. pulchella, P. hystrix, P. compressa, P. bicuspis, P. tridentata, P. elegans, P. laeviuscula, P. norvegica. Paranaenia Charles Chilton in: Tr. N. Zealand Inst., v. 16. p. 258. 1884 V. Sp.: P. typica, P. dentifera, P. longi- manus. Parandania Thomas R.R. Stebbingin: Ann. nat. Hist., ser.7 v.4 p.206. 1899. Sp. typ.: Andania boecki. Parapallasea Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser. 2 v.7 p.429. 1899V. Sp.: P. borowski, P. lagowskit, P. puzyllii. Parapherusa pro: Harmonia Haswell 1879. T. R. R. Stebbing in: Tier- reich, v. 21 p. 383. 1906IX. „TTapd, beside, Pherusa“. Paraphoxus G@. O.Sars, Crust. Norway, v.1 p.148. 1891. Sp.: P. oculatus. Parapleustes R. Buchholz in: Zweite D. Nordpolarf., v. 2 p. 299, 337, 398. 1874. Sp.: P. glacilis (P. graeilis). Pararistias David Robertson in: P. nat. Hist. Soe. Glasgow, n.ser. v.3 p.201. 1892. Sp.: P. audouinianus. Paratryphosites ThomasR.R.Stebbing in: Ann. nat. Hist., ser.7 v.4 p. 206. 1899. Sp. typ.: Lysianassa abyssi. Paratylus G. O. Sars, Crust. Norway, v.1 p. 462. 1893. Sp.: P. swammer- dami, P. falcatus, P. vedlomensis, P. smitti, P. nordlandicus, et aliae. Pardalisca Henrik Kroyer in: Naturh. Tidsskr., v.4 p.153. 1842. Sp.: P. eus- pidata. „Nomen ancillae apud Plau- tum in Casina“*., Pardaliscella G. O.Sars, Urust. Norway, v.1 p.407. 1893. Sp.: P. boeckii. Nomenelator generum et subgenerum 80 Pardaliscoides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 1725. 1888. Sp.: P. tenellus. Parelasmopus Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 1029. 1888. Sp.: P. suluensis. Parharpinia Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 o.4 p. 207. 1899. Sp. typ.: Phoxus villosus. Parhyale Thomas R. R. Stebbing in: Tr. Linn.-Soc. London, ser.2 v.7 p.26. 1897 V. Sp.: P. fasciger. Paroediceros G.O.Sars, Crust. Norway, v.1 p.291. 1892. Sp.: Oediceros macro- cheir, O. curvirostris, O. sp., Paroedi- ceros Iynceus, P. propingvus. Paronesimus Thomas R. R. Stebbing in: Bijdr. Dierk., v.17/18 p.2,14. 1894. Sp.: P. barentsi. „near to ÖOnisimus“. Paropisa Thomas R. R. Stebbing in: Ann. nat. Hist., ser.7 v.4 p.206. 1899. Sp. typ.: Opisa hispana. Parorchestia Thomas R. R. Stebbing in: Tr. Linn. Soc. London, ser.2 ®.7 p- 397, 402. 1899V. Sp.: Orchestia tenuis, O. hawaiensis, O0. sylvicola. „mapd, near, and ÖOrchestia“. _ Peltocoxa J. D. Catta in: Rev. Sci. nat., v.4 p.161. 1875. Sp.: P. marioni. Pephredo C.S.Rafinesque-Schmaltz, Preeis Decouv. somiol., p.26. 1814. Sp.: P. heteroclitus. [nom. nud.] Pephredo C.S. Rafinesque in: Amer. monthly Mag., v.2 p.41. 1817 XI. Sp.: P. potamogeti. Pereionotus ©. Spence Bate & J.O. Westwood, Brit. sess. Crust., v.1 p-226. 1862111. Sp.: P. testudo. Perioculodes G.O. Sars, Crust. Norway, v.1 p.812. 1892. Sp.: P. longimanus. Perrierella Ed. Chevreux & E.-L. Bouvier in: Bull. Soe. zool. France, v.17 p.50. 1892. Sp.: P. erassipes. Phaedra C. Spence Bate in: Quart. J. geol. Soe., v.15 p.138, 140. [1858.] Sp.: P. antiqua. Pherusa [William Elford] Leach in: Edinb. Enc., 0.7 p.432. [1813/14.] Sp.: P. fueicola. Das Tierreich. 21.Lief.: T. R. R. Stebbing, Amphipoda I. 51 802 Phippsia pro: Aspidopleurus O. Sars 1891. T.R. R. Stebbing in: Tierreich, o. 21 p. 89. 1906 IX. „After Constantine John Phipps“. Phlias E. Gu6rin[-Möneville] in: Mag. Zool., C1.7 t.19. 1836. Sp.: P. serratus. „Phlias, ’un des Argonautes“. Photis HenrikKreyer in: Naturh, Tidsskr., v.4 p.155. 1842. Sp.: P. reinhardi. „Nomen ancillae apud Apuleium in Asino aureo‘“. Phoxocephalus pro: Phoxus Kroyer 1842. Thomas R.R.Stebbing in: Rep.Voy. Challenger, v.29 p. 810. 1888. Phoxus Henrik Kroyer in: Naturh. Tidsskr., v.4 p.150. 1842. Sp.: P. holbölli, P. plumosus. ,„®oEoc, capite acuto*. Phreatogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser, 2 v.7 p.427. 1899 V. Sp. typ.: P. fragilis. „means a well-Gammarus“. Platamon Thomas R. R. Stebbing in: Rep.Voy. Challenger, v.29 p.642. 1888. Sp.: P. longimanus. „from the Greek word mAarauıv, a broad space“. Platophium James D. Dana in: Amer. J. Sei., ser.2 v.14 p.309. 1852XI. — James D. Dana in: U.S. expl. Exp., v.13m p.831, 837. [1853.] Sp.: P. brasiliense. Platyischnopus Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.830. 1888. Sp.: P. mirabilis. „nAarlc, broad, ioxvög, narrow, molc, a foot“. Platyschnopus [pro: Platyischnopus T. Stebbing 1888]. Antonio Della Valle in: F. Fl. Neapel, v.20 p.784. 1893. Pleonexes (. Spence Bate in: Rep. Brit. Ass., Meet. 25 p. 59. 1856. Sp.: P. gammaroides. |nom. nud.] Pleonexes C. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.147. 1857. Sp.: P. gammaroides. Plesiogammarus Thomas R.R.Stebbing in: Tr. Linn. Soe. London, ser.2 v7 p. 426. 1899V. Sp. typ.: P. gerst- aeckeri. Pleuracanthus W. Garjajeff in: Trudui Kazan. Univ., v.385 nr.6 p.16. 1901. Sp. & Subsp.: P. niger, P. lovenü, P. borowski, P.b. var. abyssalis, P. b. var. dichraas, P. puzyllü, P. lagowskii. Nomenclator generum et subgenerum Pleustes C. Spence Bate in: Ann. nat. Hist., ser.3 v.1 p.862. 1858. Sp.: P. tuberculata. . Plexaura C.S. Rafinesque, Anal. Nat., p.101. 1815. [nom. nud.] Podoceropsis Axel Boeck in: Skand. Naturf., Mode 8 p. 666. Sp.: P. sophia. Podoceros[pro: Podocerus Leach 1818/14]. A.Goös in: Öfv. Ak. Förh., v.22 p.582. 1866. Podocerus [William Elford Leach in:] Edinb. Ene., 0.7 p.433. [1813/14.] Sp.: P. variegatus. Forh. 1861. Podoprion Edouard Chevreuxin: Möm. Soe. zool. France, v.4 p.6. 1891. Sp.: P. bolivari. Podoprionella G.O.Sars, Crust. Norway, v.1 p.687. 1895. Sp.: P. norvegica. Podoprionides Alfred O. Walker in: Ann. nat. Hist., ser. 7 ©.17 p.457. 1906 V. Sp.: .P. incerta. Poekilogammarus Thomas R. R. Steb- bing in: Tr. Linn. Soc. London, ser. 2 v.7 p.428. 1899 V. Sp.: P.pietus, P. orchestes, P. talitrus, P. araneolus. „alludes to the variegated colouring of the several species“. Polyacanthus W. Garjajeff in: Trudui Kazan. Univ., ®. 385 ar. 6 p. 16. 1901. Sp. & Subsp.: P. belkinii, P. maximus, P. flavus, P. korotneffü, P. albus, P. godlewskü, P. g. var. vietoriü, P. para- siticus. Polycharia [pro: Polycheria Haswell 1879]. W.T.Calmanin: Ann.N. York Aec., v.11 p.288. 1898 VIII 31. Polychelia pro: ‚Polycheria Haswell 1879. ' George M.Thomsonin: Tr.N. Zealand Inst., v.14 p.283. 1882 V. ‚from its many claws‘“. Polycheria William A. Haswell in: P. Linn. Soc. N. S. Wales, v.4 p.345. 1879. Sp.: P. tenuipes, P. brevicornis. Polychiria pro: Polycheria Haswell 1879, Eduard von Martens in: Zool. Reec., v.16 Crust. p.31. 1881. Pontharpinia Thomas R. R. Stebbing in: Tr. Linn. Soe. London, ser. 20.7 p. 82. 1897 V. Sp.: P. pinguis. Pontiporeia [pro: Pontoporeia Kroyer . 1842]. James D. Dana in: U. S. expl. Exp., v.13u1 p. 912. [1853]. Pontocrates AxelBoeckin: Forh. Selsk. Christian., 1870 p. 171. 1871. Sp.: P. norvegicus, P. haplocheles. Pontogeneia Axel Boeckin: Forh. Selsk. ‘ Christian., 1870 p. 193. 1871. Sp.: P. inermis. Pontogenia [pro: Pontogeneia A. Boeck 1871]. Eduard von Martens in: Zool, Ree., v.8 p.190. 1873. Pontoporeia Henrik Kreyer in: Naturh. Tidsskr., v.4 p.152. 1842. Sp.: P. femorata. „TTovronöpeia (pontivaga), nomen Nereidis apud Hesiodum‘“. Pontoporia pro: Pontoporeia Kroyer 1842. L. Agassiz, Nomenel. zool., Index p. 305. 1846. Prinassus H.J.Hansen in: Vid. Meddel., ser 4 v.9 p.82. 1887. Sp.: P. norden- skiöldii. „TTpwaooöc, graesk Bynavn‘. Priscilla Axel Boeck in: Forh. Selsk. Christian., 1870 p.124. 1871. Sp.: P. armata. Priseillina pro: Priscilla A. Boeck 1871. Thomas R.R.Stebbing in: Rep. Voy. Challenger, v.29 p.1680. 1888. Probolium Achille Costa in: Rend. Soe. Borbon., n. ser. v.2 p.170, 173. 1853. Sp.: P. polyprion. Proboloides Antonio Della Valle in: F. Fl. Neapel, v.20 p.907. 1893. Sp.: Metopa gregaria, M. calcarata, M. ere- natipalmata, M. nasutigenes. Protomedeia Henrik Kroyer in: Naturh. Tidsskr., ©. 4 p. 154. 1842. Sp.: P. fasciata. „Tpwrouedeia, filia Nerei et Doridis“. 'Psammylla C.S. Rafinesque in: Amer. monthly Mag., v.2 p.41. 1817 XI. Sp.: P.littoralis. „abbreviated from Psammo- psylla*. * Pseudalibrotus Antonio Della Valle in: F. Fl. Neapel, v.20 p.798. 1893. Sp.: P. littoralis. Pseudoniphargus Ed. Chevreux in: Bull. Soc. zool. France, v.26 p.211. 1901XIL. Sp.: P. africanus. Pseudophthalmus William Stimpson in: Smithson. Contr., 0.6 nr.5 p.57. 1853 Ill. Sp.: P. pelagicus, P. limicola. "Ptilocheirus Nomenclator generum et subgenerum 803 Pseudotiron Ed. Chevreux in: Bull. Soe. zool. France, v.20 p.166. 1895. Sp.: P. bouvieri. Pseudotryphosa@.O.Sars, Crust.Norway, v.1 p.83. 1891. Sp.: P.umbonata, Try- phosa antennipotens. Pterygocera [pro: Pterygocerus Latreille 1825]. [Pierre Andr&| Latreille in: G. Cuvier, Regne an., n. ed. v.4 p.124. 1829. Pterygocerus [Pierre Andre] Latreille in: Ene. meth., v.10 p.236. 1825. Sp.: Oniscus arenarius. William Stimpson in: Smithson. Contr., v.6 nr.5 p.55. 1853. Sp.: P. pinguis. Pyctilus Jacobus D. Dana in: P. Amer. Ac., v.2 p.218. 1852. Sp.: Erichthonius macrodactylus (P.m.), E. pugnax (P.p.): „TüKtng, pugil“. Rachotropis [pro: Rhachotropis S.1. Smith 1883]. Jules Bonnier in: Ann. Univ. Lyon, v.26 p.653. 1896. Rhachotropis pro: Tritropis A. Boeck 1871. Sidney I. Smith in: P. U. S. Mus., 0.6 p.222. 1883 X5. „Poaxig et por“, Rozinante Thomas R. R. Stebbing in: Bijdr. Dierk., v.17/18 p.2, 38. 1894. Sp. typ.: Paramphitho& fragilis. „Don Quixote’s famous charger“. Sancho Thomas R. R. Stebbing in: Tr. Liun. Soe. London, ser. 2 v.7 p.42. 1897 V. Sp.: S.platynotus. „from a character famous in fietion“. Scamballa ([William Elford) Leach in MS.) [Adam White], Crust. Brit. Mus., p. 86. 1847. Sp.: 8. longicornis, 8. kuhliana, S. sayana, S.tristensis, 8. megalophthalmus. Schisturella [Alfred Merle] Norman in: Ann. nat. Hist., ser. 7 v.5 p.208. 1900 II. Sp.: 8. pulchra. oxıorös, divided, obpd, tail“. Schraderia Georg Pfeffer in: Jahrb. Hamburg. Anst., .5 p. 41 t.2 £.5. 1888. Sp.: 8. graeilis. Scopelocheirus Ü. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.58. 1856. Sp.: S. breviatus. 51* 804 Nomenclator generum et subgenerum “ Scopelocheirus Ü. Spence Bate in: Ann. nat. Hist., ser. 2 ©.19 p.138. 1857. Sp.: S. erenatus. Seba (A. Costa in MS.) C. Spence Bate, Cat. Amphip. Brit. Mus., p. 159. 1862. Sp.: S. innominata. Siphonaecetes [pro: Siphonoecetes Kroyer 1845). Edouard Chevreux in: Bull. Soe. zool. France, ®. 12 p. 290, 817. 1887. Siphonaecetus [pro: Siphonoecetes Kreyer 1845]. ©. Spence Bate & J.O. West- wood, Brit. sess. Crust., v.1 p.463,467. 1862 XII 1. Siphonocetus [pro: Siphonoecetes Kroyer 1845]. C. Spence Bate in: Ann. nat. Hist., ser. 2 0.19 p. 149. 1857. Siphonocoetus [pro: Siphonoecetes Kroyer 1845]. Augustus de Marschall, No- mencl. zool., p.420. 1873. Siphonoecetes Henrik Kroyer in: Naturh. Tidsskr., ser. 2 v.1 p.481, 491. 1845. Sp.: $. typicus. „Zıpwv, tubus, et oıkerng, incola“. Siphonoecetus [pro: Siphonoecetes Kroyer 1845]. CO. Spence Bate, Cat. Amphip. Brit. Mus., p. 268. 1862. Socarnella Alfred O. Walker in: Herd- man, Rep. Oeylon Pearl Fish., v. 2 p: 231, 239. 1904. Sp.: S. bonnieri. Forh. Selsk. Sp.: 8. Socarnes Axel Boeck in: Christian., 1870 p.99. 1871. vahli. Socarnioides [pro: Socarnoides T. Steb- bing 1888]. Frank E. Beddard in: Zool. Rec., 0.25 Index p.15. 1890. Socarnoides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 690. 1888. Sp.: S. kergueleni. Sophrosyne Thomas R.R. Stebbing in: Rep. Voy. Challenger, v. 29 p. 652. 1888. Sp.: 8. murrayi. „from ow- @PpooÜlvn, temperance“. Sperchius C.S. Rafinesque, Ann. Nat., p.6. 1820. Sp.: $. lueidus. Spinifer ([Carl] Holbell in MS.) Henrik Kreyer in: Naturh. Tidsskr., 0.4 p. 151. 1842. Sp.: S. spinosissimus, 8. flagelli- formis, Phoxus plumosus. Stebbingia Georg ER effer in: Jahrb. Hamburg. Anst., v.5 p.110. 1888. Sp.: S. gregaria. Crust, Sp.: :8. Stegocephaloides G. O. Sars, Norway, v. 1 p.201. 1891. christianiensis, S. auratus. Stegocephalus Henrik Kroyerin: Naturh. Tidsskr., v.4 p.150. 1842. Sp.: S. in- flatus. „Zteyw, tego et epaAn, Caput“. Stegoplax G. O. Sars in: Forh. Selsk. Christian., 1882 nr. 18 p. 88. 1882. Sp.: $. longirostris. Stenia James D. Dana in: Amer. J. Sei., ser.2 v.8 p.136. 1849 VII. — Jacobus D. Dana in: P. Amer. Ac., ©.2 p.209. 1852. Sp.: S. magellanica. Stenopleura Thomas R. R. Stebbing in: Rep. Voy.Challenger, 0.29 p.949. 1888. Sp.: S.atlantica. „from oTevög, narrow, and rAeupd, side“. Stenopleustes G.O.Sars, Orust. Norway, v.1 p.354. 1893. Sp.: $S. malmgreni, S. nodifer. Stenothoe James D. Dana in: Amer. J. Sci., ser.2 v». 14 p. 81l. 1852XI. — James D. Dana in: U.S. expl. Exp., e.1311 p.923. [1853.] Sp.: S. validus. Stenothoides Ed. Chevreux in: Rösult. Camp. Monaco, v.16 p.55. typ.: 9. perrieri. Stenyolus C.S. Rafinesque, Anal. Nat., p.101. 1815. [nom. nud.] Sthenometopa pro: Metopina A. M.Nor- man 1900. A.M. Norman in: Ann. nat. Hist., ser.7 v.10 p.480. 1902XIH. Stimpsonella pro: Stimpsonia Bate 1862. Antonio Della Valle in: F, Fl. Neapel, v.20 p.421. 1893. Stimpsonia Ü©.Spence Bate (&J.O.West- wood), Brit. sess. Crust., ©. 1 p.284. [1862 IV 1.] Sp.: 8. chelifera. „in compliment to the distinguished natu- ralist of the United States’ Exploring _ Expedition to the North Paeifie“. Stomacontion 'Thomas R. R.Stebbing in: Ann. nat. Hist., ser. 7 v.4 p.205. 1899. Sp. typ.: Acontiostoma pepinü. Stygobromus E. D.Cope in: Amer. Na- tural., ©. 6 p.409, 413,422. 1872. Sp.: S. vitreus. Stygodromus [pro: Stygobromus E. D. Cope 1872]. Eduard von Martens in: Zool. Rec., ©. 10 p.189. 1875. Stygonectes William Perry Hay in: P. U. S. Mus., ©.25 p. 430. 1902IX 23 Sp. typ.: Orangonyx flagellatus. 1900. Sp. er! , DT En Suleator pro: Bellia Bate 1851. ©. Spence Bate in: Ann. nat. Hist., ser.2 v.13 p. 504. 1854. Sunamphithoö [pro: Sunamphitoö Bate 1857]. ©. Spence Bate (& J.O. West- wood), Brit. sess. Crust., v.l p.429. 1862 XI 1. ' Sunamphitoö (©. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.59. 1856. Sp.: 8. hamulus, S. conformatus. |nom. nud.] a Sunamphitoö C. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.147. 1857. Sp.: S. hamulus, S. conformata. Sympleustes Thomas R.R.Stebbing in: Ann. nat. Hist., ser.7 v.4 p.209. 1899. Sp.: Amphithoe latipes, Amphithopsis glaber, A. pulchella, A.olrikii, A. grandi- mana. Synamphithoe [pro: Sunamphitoe Bate 1857]. Adam White, Hist. Brit. Crust., p.201. 1857. ‚Synehelidium G. O.Sars, Crust. Norway, v.1 p.317. 1892. Sp.: S. brevicarpum, S. haplocheles, 8. intermedium. Synopia James D.Dana in: Amer. J.Sci., - ser.2 v.14 p.315. 1852. — James D. Dana in: U. S. expl. Exp., v. 1311 p- 994. [1853.] Sp.: $. ultramarina, S. gracilis, 8. angustifrons. Synopioides Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p. 999, 1224. 1888. Sp.: $. macronyx, 8. se- cundus. Synurella (A. W. Wrzesniowski in:) Hoyer in: Z. wiss. Zool., v.28 p.403. 18771118. Sp.: 8. polonica. Syrrho& A. Goösin: Öfv. Ak. Förh., 0.22 p-527. 1866. Sp.: S. crenulata, 8. bi- cuspis [?]. Syrrhoites G. O. Sars, Crust. Norway, v.1 p.391. 1893. Sp.: 8. serrata. Talitroides (J. Bonnier in:) Victor Willem in: Ann. Soc. ent. Belgique, v.42 p.208. 1898. Sp.: —. Talitronus J. D. Dana in: Amer. J. Seci., ser.2 v.9 p.295. 1850V.— Jacobus D. Dana in: P. Amer. Ac., v.2 p. 202. 1852. Sp.: T. insculptus. . Talitrorchestia Subgen. J. F. Brandt in: Bull. phys.-math. Ac. St.-Pötersb., v.9 ' p- 137. 185119. Sp.: Talitrus cloquetii. Nomencelator generum et subgenerum 805 Talitrus ([Pierre Andrö] Latreille in:) L. A. G. Bose, Crust., v.1 p.78 [& v.2 p.148, 152]. X [1802]. Sp.: Gam- marus locusta, Oniscus gammarellus; [Talitrus locusta, T. grillus]. Talorchestes [pro: Talorchestia J. D. Dana 1852]. H. Filhol in: Recu. Passage Venus, v.311 Zool. p.459. 1885. * Talorchestia Subgen. James D. Dana in: Amer. J. Sei., ser. 2 v. 14 p. 310. 1852 XI. — James D. Dana in: U. S. expl. Exp., v. 1311 p. 851, 861. [1853.] Sp.: Orchestia (T.) gracilis, O. (T.?) quoyana. Teraticum Charles Chilton in: Tr. N. Zealand Inst., v.16 p.257. 1884 V. Sp.: T. typicum. Tessarops Alfred Merle Norman in: Ann. nat. Hist., ser. 4 v. 2 p. 412. 1868. Sp.: T. hastata. Tetradeion Thomas R. R. Stebbing in: Ann. nat. Hist., ser. 7 v.4 p.207. 1899. Sp. typ.: Cyproidia crassa. „from the Greek rerpadeiov, a set of four“. Tetromatus Ü. Spence Bate in: Rep. Brit. Ass., Meet.25 p.58. 1856. Sp.: T.typieus, T. bellianus. — U. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p-139. 1857. Sp.: T. typieus, T. bel- hianus. Thalitrus [pro: Talitrus Latreille 1802]. [Felix Edouard] Gu£rin [-Meneville] in: Exp. Moree, Atlas p.3. 1835. Thalorchestia [pro: Talorchestia J. D. Dana 1852]. H. Filhol in: Reecu. Passage Venus, ve. 31m Zool. p. 461, Planches p.28. 1885. Thersites C. Spence Bate in: Rep. Brit. Ass., Meet. 25 p.59. 1856. Sp.: .T. guilliamsonia, T. pelagica. [nom. nud.] Thersites C. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.146. 1857. Sp.: T. guilliamsoniana, T. pelagica. Thiella C. S. Rafinesque, Anal. Nat, p.101. 1815. [nom. nud.] Thoelaos pro: Laothoes A. Boeck 1871. Antonio Della Valle in: F. Fl. Ne- apel, v.20 p.592. 1893. Tiron William Lilljeborg in: N. Acta Soe. Upsal., ser.ö v.6 nr.1 p.18 (ta- bella), 19. 1865. Sp.: T. acanthurus. „Teipwv Proper name“. 806 Tmetonyx pro: Hoplöony® O. Sars 1891. T. R.R. Stebbing in: Tierreich, v. 21 p. 73, 720, 1906IX. : ;„tunrtdg, shaped ‘ by eutting, övuf, nail“. Trischizostoma Axel Boeck in: Forh. Skand. Naturf., Mode 8 p.637. 1861. Sp.: T. raschii. Tritaeta pro: Lampra A. Boeck 1871. Axel Boeck, Skand, Arkt. Amphip., , v.2 p.817. 1876. „Tpıraia, et Egennavn“. Tritropis Axel Boeek in: Forh. Selsk. Christian., 1870 p.158. 1871. Sp.: T. aculeata, T. helleri, T. fragilis. Tryphosa Axel Boeck in: Forh. Selsk. Christian., 1870 p.117. 1871. Sp.: T. nanus, T. höringiüi, T. nanoides, T. lon- gipes. Tryphosella Jules Bonnier in: Bull. sei. France : Belgique, v.24 p.170, 174. 1893 V 5. Sp.: T.sarsi, T. compressa, T. hörringii, T. angulata, T. nanoides, T. antennipotens, T. barbatipes. Tryphosites G. O. Sars, Ürust. Norway, e.l p.81. 1891. Sp. typ.: Anonya longipes. Typhosa [pro: Tryphosa A.Boeck 1871]. Jules Bonnier in: Bull. sei. France Belgique, v.24 p.170. 1893 V 5. Uneiola Thomas Say in: J. Ac. Philad., v.lıı p.388. 1818. Sp.: DT. irrorata. Unimelita. 0. A. Sayce in: P.R. Soc. Vietoria, v.13 p.237. 1901 III. Sp.: U. spenceri, Niphargus montanus. Uristes James D. Dana in: Amer. J. Sei., ser.2 v.8 p.136. 1849 VII. — Jacobus D. Dana in: P. Amer. Ac., v.2 p. 209. 1852. Sp.: TU. gigas. Urothoe James D. Dana in: Amer. J. Sei., ser.2 v.14 p.3ll. 1852 XL. — James D. Dana in: U. S. expl. Exp., v. 1311 p. 920. [1853.] Sp.: U. rostratus, U. irrostratus. Urothoides Thomas R.R. Stebbing in: Tr. zool. Soe. London, v. 131 p. 26. 1891. Sp.: U. lachneessa. Valettia Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.723. 1888. Sp.: V. coheres. „in compliment to the Baron Adolphe de la Valette*. Nomenelator generum et subgenerum Vertumnus (Leach in MS.) [Adam White], Crust. Brit. Mus., p.89. 1847. Sp.: V. eranchiü. [nom. nud.] Vijaya Alfred OÖ. Walker in: Herdman, Rep. Ceylon Pearl Fish, ®.2 p.231, 241. 1904. Sp.: V.tenuipes. „Vijäya, an ancient king in Oeylon“. Wayprechtia [pro: Weyprechtia Stuxberg 1880]. A. Birula in: Annuaire Mus. St.-Pötersb., v.4 p. 426, 442. 1900, Westwoodea Ü.Spence Bate in: Rep. Brit. Ass., Meet. 25 p.58. 1856. Sp.: W. caeculus, W.carinatus. [nom. nud.] Westwoodia |pro: Westwoodea Bate 1856]. C. Spence Bate in: Ann. nat. Hist., ser.2 v.19 p.139. 1857. Sp.: W. caecula. Westwoodilla pro: Westwoodia Bate 1857. C. Spence Bate & J.O. Westwood, Brit. sess. Crust., v.1 p.154. [1862 1 1.] Weyprechtia Anton Stuxberg in: Bih. Svenska Ak., v5 nr.22 p.27. 1880. Sp.: W. mirabilis. Wyvillea William A. Haswell in: P. Linn. Soe. N. S. Wales, v4 p. 336. 1879. Sp.: W. longimanus. „in honour of Prof. Sir ©. Wyville Thomson“. Xenocheira William A. Haswell in: P. Linn. Soe. N. S. Wales, v.4 p.272. 1879. Sp.: X. fasciata. Xenochira pro: Xenocheira Haswell 1879. Eduard von Martens in: Zool. Ree., v.16 Crust. p.31.: 1881. Xenoclea Axel Boeck in: Forh. Selsk. Christian., 1870 p. 234. 1871. Sp.: X, batei. Xenodice Axel Boeck in: Forh. Selsk. Christian., 1870 p. 266. 1871. Sp.: X. frauenfeldti. Pu Zacoreus Ü.S. Rafinesque, Anal. Nat., p.101. 1815. [nom. nud.] Zaramella |pro: Zaramilla T. Stebbing 1888]. Frank E. Beddard in: Zool. Ree., v.25 Index p.17. 1890. Zaramilla Thomas R. R. Stebbing in: Rep. Voy. Challenger, v.29 p.866. 1888. Sp.: Z. kerqueleni. „from an imagi- nary personage in Don Quixote“*. Zenodice |pro: Xenodice A. Boeck 1871]. [Alfred Merle] Norman in: Ann. N nat. Hist., ser. 6 v.15 p.493. 189. x era birenyan ee teen ur: re £ ” Amar WER ee in Kuren Ru Kae Step haar ae ie wei Va rg ne 3 ed vnlmukin a er r = x ur enge, van un re rn Aa nie heran Mala DRS RIED nA NENTeEN er PET ERREF-ANE PAS RT Re were Ar Pte ey e u En ri > a ae! u 4 Fra n. ne PRREF TO FON rt ah EEE A len zu neaie 2 Ber a ner erne vera RE Sn. en E AA ee - are ap. ar u 5 : 5% eg win en Er DEP Dre Es 2 RN Amer « "We ven en a h sen Br er Fe Pi eh ’ Zr Teen a ice, A re alkane fa Te TE Ta he Fear nt Re Fr Nat gr Pont ne er? ehe En ET age Be a N == ahR r. e & 5 I; 2.