II f lUiNfiJitïmmp - ^^^^™ ^^zs~ i-^ == LT) ^^^^» Ah* m cO BL/WHOI lil m LO D D g ■ i-=l ^^^^n O m " a ^_^J □ ssss __ : -y 0os H 0<1 ^V "•" ƒ SIBOGAEXPEDITIE. Siboga-Expeditie UITKOMSTEN OP VI JU rn ut u» i jj MP 16 L lUUl il VERZAMELD IN NEDERLANDSCH OOST-INDIË 1899— 1900 AAN BOORD H. M. S I B O G A ONDER COMMANDO VAN Luitenant ter zee T kl. G. F. TYDEMAN UITGEGEVEN DOOK Dr. MAX WEBER Prof. in Amsterdam, Leider der Expeditie (met medewerking van de Maatschappij ter bevordering van het Natuurkundig Onderzoek der Nederlandsche Koloniën) BOEKHANDEL EN DRUKKERIJ VOORHEEK E. J. BRIJLL LEIDEN Siboga-Expeditie XXXIXa' THE DECAPODA OF THE SIBOGA EXPEDITION PART IV Families PASIPH7EIDAE, STYLODACTYLIDAE, HOPLOPHORIDAE, TNEMATOCARCIINIDAE, THALASSOCARIDAE, PANDALIDAE, PSALIDOPODIDAE, GNATHOPHYLLIDAE, PROCESSIDAE, GLYPHOCRANGONIDAE AND CRANGONIDAE BY DR J. G. DE MAN lerseke (Holland) Si * * With 25 plates 'Si * late E. J. BEILL PÜBLISHERS AND PRINTERS LEIDEN I92O TO THE MEMORY OF HIS HIGHLY ESTEEMED AND BELOVED PARENTS THIS WORK IS DEDICATED BY THE AUTHUR. Superfamily PASIPH^EOIDA Borr. Family Pasiph^eidae. The family Pasiphaeidae includes at present seven genera: Pasiphcea Sav., Parapasiphaë S. I. Smith, Dantecia Caullery, Sympasiphcra Alcbck, Orphania Bate, Psathyrocaris W.-Mas. and Leptochela Stimps. PasipJuea Sav. is a cosmopolitan genus, the 26 species having been observed in all seas of the world. Of the 6 species of Parapasipha'è two occur in the Andaman and Arabian respectively Laccadive Sea, one occurs off the west coast of California, while the three remaining species are found on the east coast of the United States and in the North Atlantic, one of the latter even at Cape Point. The 5 representatives of the genus Psathyrocaris are all indopacific, excepting the variety atlantica Caull. of Psalh. fragilis, which variety inhabits the Gulf of Gascony. Of the 7 species of Leptochela two are found in the West Indies, while the rest are distributed throughout the Indopacific. The three last genera Dantecia, Sympasiphcea and Orphania are represented each by one species, found respectively in the Gulf of Gascony, the Arabian Sea and south-east of New York. The species, collected by the "Siboga", belong to the genera Pasiphcea, Psathyrocaris and Leptocliela. Of the genus LeptocJicla not only a nice new form was discovered, but of the other species, Lept. roèusta Stimps., no less than 86 specimens were taken, of which 61, collected north of Waigeu-island, are adult, so that I was enabled to contribute rather largely to the knowledge of this interesting animal, that hitherto was rather insufficiënt. Of the genus Pasiphcea Sav. 5 species were captured, unfortunately, however, 3 are represented by a single young specimen, so that it proved impossible to determine them with certainty : the single specimen of Psathyrocaris is rather much mutilated. LIST OF ALL THE SPECIES OF PASIPHjEIDAE, KNOWN AT PRESENT. I. Genus Pasiphaea Sav. 18 16. SPECIES HABITAT DEPTH in kathoms acuüfrons Bate 1888 Off Port Churruca, Patagonia South of Japan 345 775 S1BOGA-EXPEUIT1E XXXIX a3. 4833 SPECIES HABITAT DEPTH IN FATHOMS acutifrons Doflein and Balss 1912 affinis Rathb. 1902 Alcocki W.-Mas. 1891 americana Faxon 1893 amplidens Bate 1888 corteziana Rathb. 1902 cristata Bate 1888 emarginata Rathb. 1902 Faxoni Rathb. 1902 flagellata Rathb. 1906 forceps A. M.-Edvv. 1891 kakviensis Rathb. 1906 longispina Lenz 19 14 tnagna Faxon 1893 tnagna Rathb. 1904 '-) multidentata Esmark 1 865 pacifica Rathb. 1902 princeps S. I. Smith 1884. prïncipalis Sund 1912 Punta Arenas Near Cortes Bank, Calif. Bay of Bengal Gulf of Manar Arabian Sea, off the Sind coast Gulf of Panama Galapagos Islands Sagami Bay, Japan Near Cortez Bank, Calif. Off Matuku, Fiji Islands Santa Barbara Channel, Calif. Gulf of California Galapagos Islands Hawaiian Islands Straits of Magellan Hawaiian Islands Bali Sea Southern Indian Ocean at 65°i5'S., 8o° 19' E. South Pacific at 7i°4i'S., 1660 47' W. Gulf of Panama From off Point Arena to off Point Sur, Calif. East coast of the United States Off the Irish coast South of the Faeroes On Tampen Bank in the North Sea Skagerack Norwegian fjords up to Malangen From Unalaska and the Gulf of Alaska southward to the Gulf of California Cape Natal East coast of the United States from 39°56'N., 69°45'W. to 32°27'3o"N., jj° 20' 30" W. North of Unalaska, Bering Sea Off Sea Lion Rock, Washington Off Ecuador North side of the Bay of Biscay South-west of Ireland South of the Wyville Thomson ridge West coast of Norway to Andenes South of the Faeroes East of Labrador 9S4 922 406 947 259, 286 3H 55' 775 776 3'5 265 to 322 857 384—551 295, 362 to 399 and 411 to 442 177 343—337 294 O — 956, Plankton 458 276—552 This species lives nea- rer towards the sur- face than Pas. tarda Kröyer and Pas. prïn- cipalis Sund. 53—399 440 349—1342 399 859 1132 246 504 137—410 191 — 601 540—765 1) The specimens from Punta Arenas, referred by Doflein and Balss to Pas. acutifrons Bate, (in : Mitteil. aus dem Xaturh. Museum XXIX. Hamburg, 1912, p. 26), differ from Bate's description by the extremity of the telson being truncate, not forked, and will perhaps prove to belong to Pas. Faxoni Rathb. 2) According to Miss RATHBUN, in: Decap. Crust. of the northwest coast of North America, New York 1904, p. 19, the dentification of the specimens, dredged by the "Albatross" at this locality, with Pasiphaa magtia Faxon is doubtful. SPECIES HABITAT DEPTH IN FATHOMS propinqua de Man 19 16 Rathbunae Stebb. 19 14. Scotiae Stebb. 19 14. . . sic ula Riggio 1S96 . Sivado (Risso) 18 16. tarda Kröyer 1845 truncata Rathb. 1906. . , unispinosa W.-Mas. 1893. sp. de Man 1916 . . . . . sp. de Man 19 16 . . . . , //. sp. ? de Man 1916. . Near the Sulu Islands Southern Atlantic at 48°o' S., 90 50' W 7i°22'S., i6°34'W. 68°32'S., i2°49'W. Sicily West, south and east coast of Norway West of Scotland (Loch Fyne, Loch Etive, Loch Aber, Loch Linnhe, Loch Carron) Off the west and south coast of Ireland Bay of Biscay West coast of Spain and Portugal Mediterranean (Nizza, Genua, Corsica, Sardinia, Gulf of Naples, Messina, Coast of Greece) Southern Adriatic Red Sea Andaman Sea Bay of Bengal Japan Skagerack South of Jan Mayen North of east Iceland West and south-west of Iceland South-east of Greenland West coast of Greenland Davis Straits South-west of Ireland Hawaiian Islands Andaman Sea Bay of Bengal Arabian Sea Halmaheira Sea Off Sulu-island Between Batjan and the Obi Islands 245 L332 1410 From surface to 600 109 50 — 100 1 10 — 480 240- —412, surface From surface to 546 355 — 500 200 200 — 350 82— 281 293 450, 485 458—765 420 — 460 293 to 800 265, 405 200 — 350 360, 609 — 620 Plankton 150 From 820 to surface II. Genus Parapasiphaë S. I. Smith 1884. compta S. I. Smith 1884. cristata S. I. Smith 1884 Gilesii W.-Mas. 1893. . . latirostris W.-Mas. 1891 . serrata Rathb. 1902 . . . East coast of the United States : at 38°i9'26"N., 68° 20' 20" W. and at 390 03' 15" N., 70°5o'45"W. East coast of the United States, 39°22'N., 68° 34' 30 "W. Andaman Sea Arabian Sea Laccadive Sea Off Cortez Bank, Calif. at 595- 2369 1537 1628 650 696 -556, 696, 740 984 SPECIES HABITAT DEPTH IN FATHÜMS Kast coast of the United States from between lat. 35°i2'io" and 4i°53'N. 516—2949 and long. 650 21' 50" and 74°57' I5"W. West coast of Greenland 569—1093 West of Iceland 1236 South of Iceland 1180 North Atlantic, at lat. 52°33 N., long. 260 44' W. Off the west coast of Ireland 550 — 800 Cape Point (Cape Colony) 660 Caudani Caull. 1896 III. Genus Dantecia Caull. 1896. .... | Gulf of Gascony 934 annectens Alcock 190 1 IV. Sympasiphaea Alcock 1901. .... I Arabian Sea 487 tenuimana Bate 188S . V. Genus Orphania Bate 1888. . . . . I South-east of New York 1240 VI. Genus Psathyrocaris W.-Mas. 1893. fragilis W.-Mas. 1893 fragilis W.-Mas. 1893 var. atlantica Caull. 1896 haivaiiensis Rathb. 1906 infirma W.-Mas. 1894 platyophtlialmus Alcock & Anderson 1894 plumosa Alcock & Anderson 1894 Bay of Bengal Arabian Sea Off the south-coast of Muna Island Gulf of Gascony Hawaiian Islands Andaman Sea Bay of Bengal Arabian Sea Arabian Sea 240, 609 172, 609 — 620 1030 437 876 405 409 705 902 acideocaudata Paulson 1875 ') carinata Ortm. 1893 VII. Genus Leptochela Stimps. 1860. Red Sea Djibouti Off the mouth of the Tocantins, Brazil Off Porto Rico Gulf of Mexico Bahamas 27—54 6-15 19 1) According to Dr. Balss identical with Leptochela robusta Stimps. SPECIES HABITAT gracilis Stimps. 1860. pugnax de Man 19 16 robusta Stimps. 1860. robusta Bate 1888 . . , serratorbita Bate 1888 DEPTH IN FATHOMS Kagoshima Bay, Japan In deep water Off Japan 50 West coast of Korea Bay of Bima 30 Off the Kei-islands 12, 15 Hawaiian Islands Surface China Sea 20 Loo Choo Islands Ternate Sulu-archipelago 7 Kwandang-bay-entrance 4i Off Waigeu-island 77 Between islands of Wowoni and Buton From 41 — 51 South coast of Timor 18, reef Saleh-bay Up to 20 Haddumati Atoll, Maldive Islands Northern part of the Red Sea Off East Moncoeur Island, Bass Strait 38 Virgin Islands Off Porto Rico 15 Key West Surface Pasiphaea Sav. The genus PasipJuca Sav., with which Wood-Mason's genus Phye is united, because in my opinion it should hardly be regarded as a subgenus, includes at present nearly 26 species. The first described, Pas. Sivado (Risso), is the most widely distributed of all. This Pasiplura, indeed, is well known in the Mediterranean from Nizza and Genua to the coasts of Greece and in the Southern Adriatic, it is rather common off the Portuguese coast and in the Bay of Biscay, but has not yet been observed in the English Channel and Xorth Sea. It is found, on the contrary, in the Bristol Channel, in the Irish Sea, off the west coast of Scotland and Ireland, while it has been taken also, though rarely, off the south and west coasts of Norway. This species, however, occurs moreover in the Red Sea, the Bay of Bengal and the Andaman Sea and has even been dredged off the coasts of Japan ]). Pas. sicula Riggio is the second species that inhabits the Mediterranean. Still three other species are found on the west coast of Europe. Pas. principalis, which has always been confounded with Pas. tarda, until it was distinguished by Oscar Sund in 1 9 1 2 as a proper species, has been observed at the north side of the Bay of Biscay, off the south-west of Ireland, south of the Wyville Thomson ridge and off the west coast of Norway to Andenes; it occurs also south of the Faeroes and has even been captured by the "Tjalfe" east of Labrador. Pas. tarda Kröyer occurs in the seas around Greenland and Iceland, has been observed in the Skagerack and seems to occur also 1) On this occasion I wish to call attention to the fact that an exhaustive description of Pasipluca Sivado (Risso) has not yet been published, as far as I am aware, the descriptions, koown to me, being all more or less incomplete. south-west of Ireland. The third species, finally, Pas. multidentata Esmark, is found in the Norwegian fjords up to Malangen near Troms0, in the Skagerack, on Tampen bank in the North Sea, south of the Faeroes and off the east coast of the- United States. Still another species occurs on the east coast of the United States, viz. Pas. princeps S. I. Smith, a form which is, however, also recorded from the Bering Sea, from off the coast of Washington and that of Ecuador. Pas. Rathbunae Stebb. has been observed in the Southern Atlantic at lat. 48°oo'S., long. 9°5o'W., while Pas. Scotiae Stebb. is only knovvn from the Weddell Sea. A remarkable distribution shows Pas. acutifrons Bate, which has been recorded not only from off Port Churruca, Patagonia, but also from off south of Japan. Two other species occur in the Straits of Magellan, Pas. forceps A. M.-Edw. and a form from Punta Arenas, that was referred by Doflein and Balss to Pas. acutifrons Bate, but that perhaps will prove to belong to Pas. Faxoni Rathb. Pas. americana Faxon and Pas. magna Faxon occur in the Gulf of Panama, the former and Pas. Faxoni Rathb. also near the Galapagos Islands. The sea near Cortez Bank, California, is the habitat of Pas. affinis Rathb., Pas. Corteziana Rathb. and Pas. emarginata Rathb. ; the last, however, has also been taken in the Gulf of California, off Concepcion Bay ; a fourth species on the coast of California is that which was referred by Miss Rathbun in 1904 to Pas. magna Faxon, but which is perhaps different, a fifth, finally, is Pas. pacijica Rathb., which occurs sparingly from Unalaska and the Gulf of Alaska southward to the Gulf of California, but which is also known from Cape Natal, South- Africa. The sea around the Hawaiian Islands is inhabited by Pas. kaizviensis Rathb., Pas. truncata Rathb. and Pas. flagellata Rathb., the first was taken by the "Siboga" in the Bali Sea and between Batjan and the Obi Islands. Pas. cristata Bate is only known from off Matuku, Fiji Islands and Pas. amplidcns Bate is the second species recorded from Japan. Besides Pas. kaiwic?isis Rathb. still another species of this genus occurs in the Indian Archipelago, namely Pas. propinqua, a new form, closely related to Pas. Sivado (Risso), but apparently different and which was obtained by the "Siboga" near the Sulu Islands; perhaps even three other species will prove to occur in these seas. The most southern parts of the Indian Ocean near Kaiser Wilhelm II Land and of the Pacific near the Ross Sea are inhabited by Pas. longispina Lenz ; the only specimen of the former locality was found in the intestines of a pinguin, named Aptenodytes Forsteri. Besides Pas. Sivado (Risso) still two other species are known from the Indian Ocean, north of the Equator, viz. Pas. unispinosa W.-Mas. and Pas. Alcocki W.-Mas., which are found in the Bay of Bengal and the Arabian Sea. As regards the depths at which the species of this genus occur, it may be allowed to refer to the List of the species. The greatest depth recorded is 1410 fathoms, at which Pas. Scotiae Stebb. was obtained by the Scottish National Antarctic Expedition, but this species has also been captured by the vertical net from the surface to 600 fathoms. Two other forms, Pas. Pat/ióunae Stebb. and Pas. princeps S. I. Smith, were likewise taken at considerable depths, the former at 1332, the other at 1342 fathoms, but Pas. princeps occurs also at 349 fathoms. The other species have been found in less deep water, as is shown by the List; the depths vary rather much, not only in different species, but even in the same ; the records are, however, generally too few in number to form any definite opinion on the vertical distribution. Some seem to live normally on or very near the bottom as e. g. Pas. Sivado (Risso), though not only post-larval, but even adult specimens of this form are occasionally found in midwater or even at the surface. According to Stanley Kemp Pas. principalis should also be confïned to the bottom, but Oscar Sund (191 2) remarks that this is not always the case, this species having been captured also in midwater. A young specimen of this genus was taken by the "Siboga" in Plankton of the Halmaheira Sea. 1. Pasiphcra propinqua de Man. PI. I, Fig. 1 — \j. Pasiptuea propiiiqua J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel II, 1916, p. 147. Stat. 100. June 29. 6° 11' X., i20°37'.5 E. Near the Sulu Islands. 450 m. Bottom coral. 1 male. Unfortunately this specimen is rather badly mutilated, the 3rd and the 4th segments of the abdomen are torn from one another and also the ist and the 2nd, while the antennular and antennal flagella are incomplete. Pasipluca propinqua belongs to the typical species of this genus, to those in which the extremity of the telson is not forked or emarginate; it differs from all known species by that extremity being not truncate or slightly convex, but rather much prominent. This specimen is about 72 mm. long, measured in the middle line, the length (17 mm.) of the carapace is nearly one-third the length (55 mm.) of the abdomen; the carapace, 7,5 mm. high at the level of the branchial regions, is about twice as long as high and in a lateral view it narrows rather much anteriorly as usual ; like in the other species the posterior margin is emarginate in the middle. The carapace is rounded dorsally, not carinate. On each side of the middle line the rounded dorsum seems, however, to be slightly pinched in ; gradually narrowing anteriorly, it ends in a very small tooth, that has the appearance of being mutilated and incomplete ; this tooth is slightly compressed and placed a little behind the front. Front triangular, prominent, subacute, rather narrow, separated by a semicircular curve from the rounded, outer orbital angles that re ach as far forward as the front. Antennular angle also obtuse, separated by a shallow sinus from the outer orbital angle and by a deeper, though shorter sinus from the small branchiostegal spine. Anterolateral angle of carapace broadly rounded, branchiostegal sinus shallow. Sides of carapace smooth, with no ridges. First abdominal tergum rounded, the 2nd shows a tracé of an obtuse, indistinct carina posteriorly, the 3rd and the 4lh are more distinctly carinate, though the carina is only subacute and does not extend to the posterior margin of the 4"1 segment; the 5th segment, though much compressed, is again rounded dorsally. The 6th segment, which is 10,5 mm. long and 6,3 mm. broad or high, is one and a half as long as the 5th (6,6 mm.) and also about one and a half as long as broad: it is sharply carinate dorsally, the carina terminates posteriorly in a small acute tooth which is directed downward and one observes, on the anterior half of this segment, a shallow, longitudinal, oval impression, situated twice as far from the lower as from the upper margin and defined above by a curved ridge. The telson (Fig. 1 ƒ), which is 8 mm. long, one-fifth shorter than the 6lh segment, is deeply grooved dorsally, much compressed and 8 rather narrow, the width at base being scarcely one-fourth of the length ; the posterior extremity is 0,76 mm. broad, l/lu — yn the length of the telson and 2/- the width at base. The posterior extremity (Fig. 1^) is triangular, half as high as broad and probably armed on either side with 4 spinules. A much smaller spinule is moreover implanted, on the dorsal surface, just before the external spinule, like in Pas. Sivado (Risso) (vide: J. Thiele, in: Zoolog. Jahrb. Suppl. VIII, 1905, p. 467, PI- IÓ, fig- 50). Eyepeduncles reaching hardly beyond the middle of basal antennular article, with a rather large, obtuse tubercle at the base of the inner side ; corneae blackish or slate-coloured, little enlarged, situated obliquely on the distal half of the peduncle. Antennular peduncle reaching a little beyond the middle of the distance between the orbital margin of the carapace and the tip of the antennal scales, 3ld article a little longer than 2nd; stylocerite almost reaching to the distal end of basal article, the outer margin convex, the distal half sharply pointed and, like in the other species, twisted to a right angle with the basal portion. Inferior spine of basal antennal article well developed, antennal peduncle a little longer than basal antennular article. Scaphocerite 9,1 mm. long, 2,3 mm. broad, a little more than half as long as the carapace and 4-times as long as broad 5 it narrows rather much anteriorly and the terminal spine is well developed, 0,4 mm. long. External maxillipeds reaching almost to the distal end of the antennal scales. The legs of the ist pair (Fig. 1 h) reach by two-thirds, those of the 2nd by three-fourths of the fingers beyond the antennal scales. Like in Pas. Sivado (Risso) in the two first pairs of legs a spine occurs at the far end of the posterior border of the basipodite, while there is a series of spines along the same border of the meri and a well developed spine at the distal end of the lower border of the carpus. Fingers of ist pair two-thirds or three-fourths the length of the palm, those of 2nd pair a little, viz. one-sixth, longer than the palm; like in Pas. Sivado the chela of ist pair carries a small spinule on the middle and another of the same size at the distal end of the palm. The following legs apparently also resemble those of Pas. Sivado, so e. g. the propodus of the 5th pair (Fig. 1 i) is 4,8 mm. long, about 20-times as long as wide; the dactylus (Fig. 1 /) measures one-fourth of the propodus, is nearly 4-times as long as wide distally and is, like in the other species, provided at the rounded extremity and on the lower border with long setae, that, like in Pas. Sivado (vide J. Thiele, 1. c. p. 467, PI. 16, fig. 51), are armed at one side of their distal half with triangular teeth and at the extremity with 5 or 6 barbed hooks. According to Alcock (Descript. Catal. Indian Deep-Sea Crustacea, Calcutta 1901, p. 59), Pas. Sivado (Risso) should occur in the Bay of Bengal and the Andaman Sea, but unfortunately he does not say in his description whether the abdominal segments are carinate or not, he does not describe the shape of the front and concerning the extremity of the telson he only remarks that it is not forked. It appears therefore doubtful whether his specimens really belonged to Pas. Sivado, but probably it has been the case, because the carapace is described as being about half the length of the abdomen without the telson, a proportion which is observed in Risso's species, but not in Pas. propinqua. I therefore applied to Prof. Döderlein of Strassburg, who kindly sent me 3 of the 18 specimens of Pas. Sivado from Nizza, mentioned by Dr. Ortmann in his work on the Decapod Crustacea of the Strassburg Museum, p. 463. The examination of these specimens proved indeed that Pas. Sivado is different from Pas. propinqua. The chief differences are presented by the abdomen. In Pas. Sivado the carapace measures about half the length of the abdomen without the telson, while in Pas. propinqua the abdomen without the telson is almost 3-times as long as the carapace. In one of the 3 specimens the carapace is 1 73/4 mm. long, the abdomen 45 mm. and 38 mm. without the telson, in another specimen the carapace is 1 j1/^ mm. long, the abdomen without the telson which is broken, 39 mm., and in the third these numbers are 1 6:,/4 mm., 44 mm. and 38 mm. In Pas. Sivado the abdominal segments are n o t carinate, even the upper border of the 6th segment, though much compressed, is blunt, not carinate, and the terminal spine runs horizontally backward, whereas in Pas. propinqua this segment is sharply carinate and the terminal spine regularly curved downward. The posterior margin of the telson (PI. I, Fig. 2a) is slightly convex, regularly rounded, presenting another form than in Pas. propinqua and the telson is less deeply grooved. The front (PI. I, Fig. 2) is in Pas. Sivado also triangular, but comparatively broader, less prominent and projects distinctly less forward than the outer orbital angles, that are angular though obtuse, while in Pas. propinqua they are rounded and project nearly as far forward as the front. In his valuable work on "The Decapoda Natantia of the Coasts oflreland, Dublin 1910", Stanley Kemp, however, has pointed out, p. 37, that the abdominal somites of Pas. Sivado are not dorsally carinate and that the telson is truncate at apex. A detailed, exhaustive description of Pas. Sivado (Risso) does, however, as far as I know, not yet exist. 2. Pasiph(ca sp. v.. PI. I, Fig. 3 — 30. Stat. 148. August 10. 0°ij'.6S., 1290 14'. 5 E. Halmaheira Sea. Plankton. 1 young specimen. I do not succeed in determining with certainty this specimen, but nevertheless wish to describe it. The carapace, measured in the middle line, is 4,6 mm. long, the abdomen 9,7 mm., the entire length 14,3 mm.: the carapace is thus half as long as the abdomen. Front (Fig. 3) broadly rounded, little prominent, projecting much less forward than the rounded, orbital angles; 110 antennular prominence, antero-lateral sinuses wanting or hardly indicated, branchiostegal spine small. Carapace compressed, though not carinate dorsally. Postfrontal spine slender, obliquely- ascendant, procurved, acuminate. Abdomen not carinate, the terga of the ist — 5th somite rounded; the 6th somite, which is twice as long as the 5th and twice as long as wide, is very much compressed, but the upper border is blunt, not carinate, and ends in a small acute tooth. Telson (Fig. 3^) measuring two- thirds the length of the 6lh somite, deeply furrowed along its whole length to near the base; posterior margin truncate, very slightly convex, like in Pas. Sivado (Risso), and armed with 4 spinules at either side of the middle line. Fndopodite of caudal swimmeret projecting beyond the telson by about one-fifth of its length, exopodite by two fifths. The antennular peduncle reaches six-sevenths of the way along the distance between the orbital margin and the extremity of the antennal scale; basal article one-third longer than the SIBOGA-EXrEDlTIE XXXIX i?3. 2 IO two followino- taken together, 3rd article one-third longer than 2nd, 2nd one-third longer than thick. Stylocerite acuminate, a little shorter than the eyestalks. The eyepeduncles reach to the distal sixth of basal article, their proximal half appears a little wider than the distal half and the distance between the orbital margin and their distal extremity is almost 3-times as long as their greatest width ; only a small spot of blackish pigment is visible on the outer side of the cornea. The scaphocerite (Fig. 3 f) is 1,62 mm. long, about one-third of the length of the carapace, it is nearly 3-times as long as wide and narrows rather little distally; the outer margin is straight and the terminal spine, that projects beyond the rounded extremity of the blade, is o, 106 mm. long. The external maxillipeds reach almost to the distal end of the scaphocerite, the length of the terminal joint is in proportion to that of the penultimate as 5:3. The peraeopods of the two first pairs extend by somewhat more than the fingers beyond the antennal scales. Merus of ist pair, like the preceding joints, unarmed, carpus short, about one and a half as long as thick, with a small obtuse tooth at the far end of the lower margin. Chela 2,34 mm. long, fingers shorter than palm, proportion like 5:8; width of palm about one-third its length. The 2nd legs (Fig. 3^ — i) are armed with a spine at the far end of the basipodite, with a spine near the distal third of the merus and with another at the far end of the lower margin of the carpus, the latter twice as long as wide distally. Chela 2,6 mm. long, fingers also shorter than palm, but the proportion is like 6:8; palm 41/2-times as long as wide, its greatest width at the proximal third. The measurements of the legs of the 3ld pair (Fig. 3/, 3 /F) are: ischium long 0,64 mm., merus 1,62 mm., carpus 0,2 mm., propodus 0,78 mm., dactylus 0,38 mm. The exopodite extends to the 2nd third or fourth of the merus. The measurements of the 4th pair (Fig. 3/, j«) are: ischium 0,22 mm., merus 0,22 mm., carpus 0,1 mm., propodus 0,23 mm.; there is a seta long 0,14 mm. at the distal end of the propodus and another, 0,06 mm. long, a little behind it. The exopodite projects still a little beyond the terminal joint of the endopodite. The 5th pair (Fig. 3/2, 30), finally, presents the following measurements : ischium 0,38 mm., merus 0,9 mm., carpus 0,22 mm., propodus 0,7 mm., dactylus 0,2 mm. long. The dactylus is 3-times as long as broad and bears 6 or 7 setae at the distal end and along the distal half of the lower margin ; these setae are, like in Pas. Sivado and Pas. propiuqua, armed along their distal half with triangular teeth and near the extremity with barbed hooks. The exopodite reaches but a short way beyond the ischium. This species appears closely allied to that from Stat. 141, for which, when indeed new, the name of kilarzila is proposed (p. 14), but is nevertheless no doubt different. In the species from Stat. 148 the post-frontal tooth has a different form, the upper margin of the 6* abdominal somite ends in a small acute tooth, while the posterior extremity of the telson is very slightly convex. Merus and carpus of the ist pair of legs have a stouter shape, the merus is quite unarmed, while the merus of the 2nd pair is only armed with one spine. The species from Stat. 148 is also related to Pas. Sivado (Risso), but I do not believe that it may be regarded as a young of it. 1 1 3. PasipJuca sp. p. PI. I and II, Fig. 4— 4/- Stat. 105. July 4. 6°8'N., i2i°i9'E. Off Sulu-island. 275 m. Coralbottom. 1 specimen. Though this specimen, like that from Stat. 141, seems to belong also to a new species, I likewise hesitate to describe it as such, because it is still young, not yet adult, as supposed. This specimen, indeed, is only 20 mm. long from the anterior margin of the rostrum to tip of telson. In its outer appearance and in several characters it much resembles Pas. Sivado (Risso). The carapace, measured in the middle line, proved to be 5,45 mm. long, little more than one-fourth of the whole length, while the length of the carapace is contained two and two- thirds times in the length of the abdomen. Rostrum (Fig. 4a) rounded, little prominent and much broader at base than long; outer orbital angles obtuse, projecting far beyond the rostrum. Antennular prominence also rounded, hardly separated from the outer orbital angle by a short and very shallow sinus, but by a broader and deeper sinus from the rounded antero-inferior angle of the carapace. Branchiostegal spine small, behind which the branchiostegal sinus appears very broad though shallow. The carapace which is 3-times as long as high at the level of the branchial regions, narrows rather much anteriorly like in Pas. Sivado and the linear distance, 1,2 mm., between the two branchiostegal spines, is a little shorter than the height, 1,68 mm., of the carapace at the level of the branchial regions. The upper border of the carapace is obtuse, rounded, not carinate; a little behind the rostrum it descends obliquely to the level of the front and while the carapace is here, at the anterior fourth or fifth, distinctly pinched in on each side of the middle line, the anterior extremity of the upper border looks like a tuberculiform post-frontal tooth. A short obtuse crest unites this post-frontal tooth with the anterior margin of the rostrum. Lateral sides of carapace smooth, without ridges or grooves. The first five abdominal somites are rounded dorsally. The 5"1 somite which is 1,6 mm. long, measured along the upper border, appears half as long as the 6th, that measures 3,5 mm.; the óth somite, twice as long as high, is strongly compressed, as usual in this genus, its upper border, however, is blunt and terminates posteriorlv in a small sharp tooth, that is directed horizontally backward. The telson is 2,45 mm. long, about two-thirds the length of 6th somite, 0,6 mm. wide at base, while the posterior extremity (Fig. 4c) is 0,25 mm. broad; the posterior extremity appears slightly convex like in Pas. Sivado. the spinules are lost except those at the outer angles, that are 0,27 mm. long. The telson is deeply and widely grooved dorsally to near the base, it reaches a little beyond the middle of the outer plate of the tailfan and to the posterior fourth or fifth of the inner. Eyestalks cylindrical, not dilated distally, reaching nearly to the distal extremity of basal antennular article, cornea small, blackish, situated on the outer side and measuring one-hfth the length of the stalks. Antennular peduncle 2 mm. long, one-tenth the length of the body and reaching four-fifths of the way along the antennal scale; basal article little, only one-fifth, longer than the 2nd and 3rd taken together, 2nd measuring about one-third of basal article and one-third longer than thick, 3rd one-fourth longer than 2nd. Antennular scale as long as the eyestalks. I 2 Scaphocerite (Fig. \d) 2,2 mm. long, two-iïfths the length of the carapace, three and two-thirds times as long as wide and showing the greatest width a little behind the middle; it narrows rather little distally, the outer margin is straight and the terminal spine extends by half its length beyond the rounded tip of the blade. External maxillipeds reaching almost to the distal extremity of the scaphocerite, very slender, the length of the terminal joint is in proportion to that of the penultimate as 5 : 3, these joints being respectively 1,34 mm. and 0,84 mm. long; the terminal joint is 13-times, the penultimate 8-times as long as wide. The exopodite extends almost to the distal extremity of the ante- penultimate joint. Basipodite of the peraeopods of the ist pair (Fig. 4/") with a short spine at the far end of the posterior border. Merus with 4 spines on the posterior border, the ist at the proximal sixth, the 2nd just behind the middle, the 3rd at the distal fifth and the 4th twice as far from the 3rd as from the distal extremity of the merus ; the 2nd and the 3rd spine are a little larger than the two others. Carpus (Fig. ^g) about one-fourth of the merus, slightly more than twice as long (0,56 mm.) than thick distally (0,26 mm.), with a short subacute tooth at the far end of the posterior border. Chela a trirle longer than the merus and 4-times as long as the carpus, fingers shorter than palm, proportion like 3:5; palm about 4-times as long as wide. Exopodite reaching to 2nd third of merus. Basipodite of the peraeopods of the 2nd pair (Fig. 4//) with a spine at the far end of the posterior border. Posterior border of merus armed with 10 spines of somewhat unequal length, merus one-third longer than that of the ist pair. Carpus (Fig. 4/) one-fifth of the merus, twice as long as thick, with a sharp spine at the far end of the posterior border, which spine is more developed than that with which the carpus of ist pair is armed. Chela as long as the merus, almost 5-times as long as the carpus, fingers shorter than palm, proportion like 2:3; palm almost ó-times as long as wide. Exopodite reaching to 2nd fifth of merus. The measurements of the legs of the 3ld pair (Fig. 4/) are: Ischium long 0,7 mm., merus 1,7 mm., carpus 0,23 mm., propodus 0,94 mm., terminal joint 0,39 mm. Exopodite extending almost to 2nd fourth of merus. Ischium of 4th pair (Fig. 4/ — n) 0,4 mm. long, merus 0,26 mm., carpus 0,15 mm., propodus 0,25 mm., the very short conical dactylus 0,07 mm.; a short seta at the far end of the posterior border of the carpus, posterior border of propodus with 6 setiferous setae, a seta long 0,16 mm. at the distal end of the dactylus with a finer and shorter one just near it. Exopodite just exceeding the merus. Ischium of 5"1 pair (Fig. 40) 0,66 mm. long, merus 1,4 mm., carpus 0,46 mm., propodus 1,16 mm., dactylus 0,34 mm.; dactylus (Fig. 4/) spatuliform, 0,12 mm. wide, almost 3-times as long as wide and furnished with 10 setae, of which the longest at the tip is distinctly longer than the dactylus, while the rest gradually decrease in length. This form appears most closely related to the specimen from Stat. 148. Carapace and abdomen, indeed, closely agree, excepting the proportion between length of carapace and abdomen. The antennular peduncle reaches farther forward and the basal article is distinctly longer in proportion to the two following than in the specimen from Stat. 105. The thoracic legs show also different characters. In the ist pair the carpus has a much stouter shape 13 than in the specimen from Stat. 105, the merus is quite unarmed and the chela more swollen, of the 2nd pair the merus bears but one single spinule on its posterior border. 4. Pasiphcea n. sp.r PI. II, Fig. 5—57'. Stat. 141. August 5. i°o'.4S., 127° 25'. 3 E. Betvveen Batjan and the Obi Islands. From 1500 m. to surface. I do not prosper in determining with certainty this specimen, which probably belongs to a new species; on account of its small size it seems to be young. The proportion between the leno-th of carapace and abdomen is the same as in Pas. kaiwiensis Rathb., the former being ij'l mm. long, measured in the middle line, the latter 23^ mm., the entire length being 31 or 32 mm. Front broadly triangular, obtuse, resembling that of Pas. kahviensis (Fig. 6) and as little prominent. There is no sinus between the rounded outer orbital angle and the likewise rounded antennular prominence, while the two following sinuses are more shallow than in Pas. kahviensis, so that the antero-lateral margin of the carapace shows a different appearance from that species. The dorsal tooth is rather small, triangular, acute, though not spiniform as in Pas. kaiwiensis, its upper margin is nearly straight and it does not reach to the level of the frontal prominence. For the rest the carapace resembles that of Pas. kahviensis, being 33/4 mm. high at the level of the branchial regions. The abdomen (Fig. 5 a) also agrees with that of Pas. kaiwiensis, except in the following. The 6th segment, 5,5 mm. long and 2,5 mm. broad, is al most twice as long as the 5th (2,9 mm.) and a little more than twice as long as broad, while in Pas. kaiwiensis the proportion is like 5:3: the 6th segment appears therefore narrower and the lower margin ends posteriorly in a small spine. The telson is 3,8 mm. long, nearly two-thirds the length of the 6lh segment; the tip, 0,4 mm. broad, is hardly emarginate, still less than that of Pas. kahviensis, and it is half as broad as the base of the telson, the upper surface of which resembles that of Pas: kaiwiensis . Eyestalks like in this species, but the corneae pale brown. The antennular peduncle reaches three-fourths of the way along the antennal scale, 3rd joint one and a half as long as 2nd; stylocerite as in Pas. kahviensis. Antennal peduncle reaching almost to the distal end of 2nd antennular article, spine on basal joint like in Pas. kahviensis. Scaphocerite (Fig. 5Ó) 3,6 mm. long, not yet half as long as the carapace, comparatively wider than that of Pas. kahviensis, being 1,1 mm. broad, about 3-timës as long as wide; the scaphocerite is also less narrowed distall y than in Pas. kahviensis and the terminal spine is shorter, reaching hardly beyond the blade. The external maxillipeds extend to the distal extremity of the scaphocerite. The peraeopods of the ist pair (Fig. 5c, $d) reach by the fingers and one-third of the palm, those of the 2nd by the fingers and almost half the palm beyond the antennal scale. Merus of the ist pair 3,45 mm. long, 11-times as long as wide in the middle, where a small spinule is implanted; merus hardly thickened at the distal end. Carpus one-fourth of the merus, twice as long as thick distally. Chela 4,26 mm. long, nearly one-fourth longer than the merus, palm comparatively longer than in Pas. kahviensis, one and a half as long as the fingers and 4-times as long as '4 wide in the middle. Exopodite reaching to the middle of the nierus. Basis and ischium of 2nd legs (Fig. 5 ^) like in Pas. kaiwiensis, merus 4,5 mm. long, one-third longer than that of ist pair, 1 1 -times as long as broad in the middle, not thickened at distal extremity and armed with 3 well-developed spines, long 0,23 mm., along the distal half and with 5 or 6 rudimentary spinules along the proximal half. Carpus 0,8 mm. long, about one-sixth the length of the merus, and one and a half as long as thick distally ; lower margin with acute spine at the extremity. Chela 5,7 mm. long, one-fourth longer than the merus, fingers (2,7 mm.) one-tenth shorter than the palm (3 mm.), which is nearly 5-times as long as wide. Merus of 3rd legs (Fig. 5/) 3,7 mm. long, 37-times as long as wide in the middle, somewhat thickened at the proximal extremity, a little less at the distal one. Carpus 0,36 mm. long, one-tenth of the merus and nearly 3-times as long as thick in the middle. Terminal joint tapering, 2,25 mm. long, about two-thirds of the merus, with a few marginal setae. Ischium of 4th legs (Fig. 5^) 0,6 mm. long, merus 1,2 mm., twice as long as the ischium and S-times as long as wide ; following joints lost. Merus of 5th pair (Fig. 5//) 2,12 mm. long, 1 2-times as long as wide; carpus 0,8 mm. long, 0,19 mm. thick distally; propodus 1,88 mm. long, dactylus (Fig. 5/) long 0,48 mm., broad 0,21 mm., little more than twice as long as wide, for the rest like in Pas. kaiwiensis. The carpus appears therefore a little less than half as long as the merus and the propodus, the latter a little shorter than the merus, while the dactylus measures one-fourth of the propodus. The species with which this specimen presents some afhnities, are Pas. cristata Bate, Pas. americana Faxon and Pas. fiagellata Rathb. Pas. cristata Bate from the Fiji Islands resembles the specimen from Stat. 141 as regards the abdomen, the carapace and the two pairs of antennae, but the post-frontal tooth has a different shape, like also the anterolateral margin of the carapace, while the legs show different measurements. The carpus of the two first pairs appears in the specimen from Stat. 141 shorter in proportion to the length of the palm and the merus of the 2nd pair is armed with several spinules, in Pas. cristata only with one. In the legs of the 3rd pair the carpus appears also shorter in proportion to the terminal joint than in Pas. cristata. Unfortunately the extremity of the telson was not described by Spence Bate. Pas. americana Faxon differs by the carapace being longer in proportion to the length of the abdomen, by the telson being more deeply notched, by the narrower scaphocerite, which is 4-times as long and wide and by the meri of the legs of the ist and 2nd pair being only furnished with a single spine near the middle of its inferior margin. Pas. jlagellata Rathb. from the Hawaiian Islands differs by the length of the carapace being contained little more than twice in the length of the abdomen, by the 6th segment of the abdomen being bluntly carinate, slightly exceeding the telson, and being wider in proportion to its length. When this species should indeed once prove to be new to science, the name of Pas. hilarula is proposed for it. 5. Pasiphcea kaiwiensis Rathb. PI. II, Fig. 6 — 6/. Pasiphcca kaiwiensis M. J. Rathbun, in: U.S. Fish Commission Bulletin for 1903, Part III, Wash. 1906, p. 927, PI. XXIII, fig. 4. 15 Stat. 316. Febr. 19, 1900. 7°i9'.4S., n6°49'.sE. Bali Sea. 538 m. Bottom fine, dark browit sandy mud. 1 female without eggs. This female is not vet full-grown, it measures 73 mm. from the frontal margin of the carapace to tip of telson, while the type specimen from the Hawaiian Islands, an ovigerous female, was 99,7 mm. long. Of the specimen from the Bali Sea the carapace, measured in the middle line, is 18 mm. long, the abdomen 55 mm., so that the latter is 3-times as long as the carapace. The greatest height of the carapace, at the level of the branchial regions, is 71/.., mm., so that the carapace appears a little more than twice as long as high; in a side view it narrows rather much anteriorly, so that at the posterior end of the branchiostegal sinus the carapace appears only half as high as at the level of the branchial regions. The frontal margin, above the base of the eye-peduncles, appears broadly rounded when looked at from above, but is little prominent. The carapace, the posterior margin of which is emarginate, is rounded dorsally and armed anteriorly, just behind the front, with a compressed, obliquely- ascendant tooth, of which the acute spiniform apex reaches almost to the level of the front and the sharply carinate, upper edge of this tooth is slightly concave ; the tooth is one millimeter high. Outer orbital angle obtuse, projecting a little more forward than the front, post-antennular angle defined, blunt and separated both from the outer orbital angle and from the rounded anterolateral angle of the carapace by a shallow sinus. Branchiostegal spine well developed, the linear distance between their apices being 5 mm. long. The anterolateral angle of the carapace is foliowed by the branchiostegal sinus, which is somewhat longer than the two sinuses situated before it. The sides of the carapace are apparently smooth, without ridges. Unfortunately on the photograph of the type the frontal tooth is quite invisible. Abdomen (Fig. 6c) not carinate. While the ist, 3,d and 4th terga are rounded, the 2nd and the 5th are even slightly flattened dorsally. The 6th segment which is 10 mm. long, measured dorsally, and 6 mm. broad, is half as long again as the 5th (62/., mm.); it is much compressed, but the slightly convex upper margin is blunt, smooth, and posteriorly truncate. The telson, 8 mm. long, is four-fifths as long as the 6th segment; the tip (Fig. 6d) shows a shallow emargination in the middle, unfortunately the spinules at the tip are mostly lost, but 4 or 5 pairs occur no doubt in this species. The tip is 0,8 mm. broad and the telson is about twice as broad, viz. 1,7 mm., at the base; the spinules at the outer angles of the tip are probably 0,5 mm. long, the other spinules are a little shorter. The upper surface of the telson is flattened, but the posterior third is grooved, the groove passing gradually into the flattened surface. The endopodite of the caudal swimmeret projects about by one-third, the exopodite almost by half its length beyond the tip of the telson. According to the original description, the eyes should be considerably enlarged distally. In the female from Stat. 316, however, this is not the case. The eye-peduncles, indeed, that reach about to the distal third of ist antennular article, are only twice as long as broad at the base of the corneae, where they are a little enlarged ; the corneae are half as long as the eyestalks and of a grayish colour, their posterior margin is blackish and there is a blackish spot on the outer side. The antennular peduncle reaches a little beyond the middle of the scaphocerite, basal i6 joint as long as the 2nd and 3ld taken together, 3rd joint twice as long as 2nd; flagella not complete. Antennular scale acute, its distal half twisted, like in other species, to a right angle vvith the basal portion and sharply carinate above ; the scale reaches almost to the end of basal article. There is a small spine, directed inward, on the anterior margin of the lower surface of basal antennal article and the peduncle hardly projects beyond the ist article of the inner antennae. Scaphocerite (Fig. 6 e) gl/2 mm. long, half as long as the carapace and about 4-times as long as wide, presenting its greatest width at the posterior fourth and narrowing from here much more distallythan proximally; outer margin slightly convex, terminal spine well developed, 0,6 mm. long, '/ie the entire length of the scale. External maxillipedes reaching almost to the apex of the antennal scales, the terminal joint, like in Pas. cristata, somewhat spatuliform and widened distally, about one and a half as long as the preceding joint. The peraeopods of the ist pair (Fig. 6/) extend by a little more than half the length of the fingers beyond the antennal scale, those of the 2nd by two-thirds that length. Ischium of ist legs unarmed, but with some short setae on the lower margin. Merus 7,7 mm. long, 12-times as long as wide in the middle and somewhat thickened at the distal end, being here one-third thicker than in the middle; lower margin with 2 small spinules in the middle, of which the posterior larger one is 0,3 mm. long. Carpus one-fourth of the merus and half as thick distally as it is long. Chela a trifle, viz. 1/1. , longer than the merus, palm or.e- fourth longer than the fingers and nearly 4-times as long as wide in the middle, narrowing somewhat towards the carpal articulation and towards that of the fingers; fingers tapering, crossing one-another and acumi-nate. Exopodite reaching to the middle of the merus. Lower margin of base of 2nd legs (Fig. 6g) terminating in a small spine, for the rest unarmed like the ischium. Merus 9,6 mm. long, one-fourth longer than that of ist legs, its form is the same, but it is not thickened at the distal extremity and it is armed, along the lower margin, with 14 spinules of somewhat unequal length, though usually 0,32 — 0,35 mm. long. Carpus about one-sixth the length of the merus, one and a half as long as thick distally, the lower margin terminating in an acute spine. Chela 10,4 mm. long, nearly as long as the merus, fingers (6,1 mm.) about one and a half as long- as the palm (4,3 mm.), that is 4-times as long as wide; fingers like those of ist pair. Exopodite reaching to the 2nd third of the merus. The merus of the slender legs of the 3rd pair (Fig. 6//), that extend almost to the distal end of the merus of 2nd pair, is 8,8 mm. long, 55-times as long as wide in the middle and gradually thickens somewhat towards the proximal extremity, a little less towards the distal one. The carpus, 4-times as long as thick in the middle, is short and measures but lJls the length of the merus. The tapering terminal joint, finally, is 3,8 mm. long, not yet half as long as the merus; it carries a few setae and 3 or 4 at the extremity. The exopodite does not extend to the middle of the merus. Legs of 4th pair (Fig. 62', 6/), half as long as the 3rd, less slender. Ischium 1,2 mm. long, merus 3,15 mm., carpus 0,8 mm., propodus 1,56 mm. and dactylus 0,46 mm.; merus 12-times as long as wide, somewhat setose, carpus one-fourth, propodus half as long as the merus, dactylus about one-third of the propodus, 3-times as long as broad, with some setae along the lower margin, the longest of which, at the distal extremity, is one and a half as long as the joint. Exopodite reaching to the distal end of the carpus. 17 The legs of the 5th pair (Fig. 6£, 61) extend almost to the middle of the merus of the 2nd and are nearly as slender as those of the 4th pair. Merus 4,9 mm. long, carpus 1,8 mm., propodus 3,72 -mm., dactylus 1,06 mm. Merus 13-times as long as wide in the middle, almost 3-times as long as the carpus, which is about 6-times as long as thick at the distal end ; propodus twice as long as the carpus, dactylus about one-fourth the propodus, nearly 3-times as long as wide, somewhat spatuliform and armed at the rounded distal extremity and along the lower margin with setae; the seta at the distal end of the upper margin is the longest of all, twice as long as the dactylus, while the rest gradually decrease in length. Exopodite short, little longer than ischium. General distribution: Hawaiian Islands (Rathbun). Psathyrocaris VV.-Mas. The genus Psathyrocaris W.-Mas., characterized besides by other characters by the extraordinary length of the exopodites of the abdominal appendages, is represented by five species and one variety. Psath. fragilis W.-Mas., the first described species, occurs in the Bay of Bengal and the Arabian Sea, probably also in the Indian Archipelago, for a specimen, captured by the "Siboga" off the south coast of Muna Island, must very likely be referred to this species. A variety atlantica Caull. occurs in the Gulf of Gascony, the only not indopacific locality from which this genus is known. Psath. platyophtkalmus Alcock and Anderson is found in the Bay of Bengal and the Arabian Sea, Psath. plumosa Alcock and Anderson in the Arabian Sea and Psath. infirma W.-Mas. in the Andaman Sea. Psath. hawaiiensis Rathb., the 5"1 and last species, finally, has been taken in the vicinity of Modu Manu, one of the Hawaiian Islands and situated close to the northern tropic. As regards the vertical range, it must be observed that the specimen of Psath. fragilis from off the south coast of Muna Island was captured at the greatest depth, namely of 1030 fathoms, but this species has also been taken at 172 and at 609 — 620 fathoms in the Arabian Sea, in the Bay of Bengal at 240 and at 609 fathoms. The three other species that occur in the Indian Ocean north of the Equator, have been found at depths varying between 405 and 902 fathoms, Psath. hazmiiensis at 876 fathoms, while the variety atlantica was taken by the "Caudan" at 437 fathoms. Psathyrocaris W.-Mas. proves thus to be a truly deep-sea genus. 1. Psathyrocaris fragilis W.-Mas. Psathyrocaris fragilis J. Wood-Mason, Ann. Mag. Nat. Hist. Ser. 6, Vol. XI, Febr. 1893, p. 171, PI. X, XI. Psathyrocaris fragilis A. Alcock, A descr. Catal. Indian Deep-Sea Crust., Calcutta 1901, p. 69. Illustrations of the Zoology of the Investigator, Crustacea, PI. Lil, fig. 5. Stat. 208. Sept. 22. 5°39'S., I22°I2'E. Off the south-coast of Muna Island. 1886 m. Bottom solid green mud. 1 specimen. Unfortunately this specimen is much mutilated, the carapace partly folded and wrinkled, the antennular and antennal flagella, like the legs, wanting, the eye-peduncles, finally, are SIBOGA-EXrEUITIK XXXIX a3. 3 iS excavated above, having apparently been crushed. It is therefore with some doubt referred to this species. Integument smooth. The carapace with the rostrum is probably 19 mm. long, the abdomen about 35 mm., so that the latter should be slightly longer with regard to the length of the carapace than in older specimens, because, according to Professor Alcock, in an average specimen the median length of the carapace and the rostrum should be 23 mm., of the abdomen 38 mm. The rostrum has the same form and length as in the Figure 5 of the "Illustrations", but the low prominence at the base does not exist, the upper margin being quite straight. The upper margin is armed with 1 6 minute teeth, the foremost of which is placed near the apex, there is a larger interspace between the ioth and nth tooth, these two teeth being nearly as far distant from one another as the ist from the 3rd and the 2nd tooth is one and a half as far distant from the ist as from the 3rd, while the 3rd to the 8th stand closer together; the iilh tooth is also placed nearer to the i2th than the following. The 5th abdominal somite, measured along the dorsal border, proves to be 3,5 mm. long, the 6th 9,25 mm., the proportion being the same as in Fig. 5' of the "Illustrations", the 6th somite appears therefore almost 3-times as long as the 5th, not twice as long (Alcock, 1. c); it appears also a little less broad (3,5 mm.) in proportion to its length than in the figure of the "Illustrations", owing perhaps to its somewhat younger age. The extremity of the telson is broken off. Eyes brown, according to Alcock they are in this species "nearly black". Joints of the antennular peduncle like in Fig. 5 of the "Illustrations", the 2nd joint being one and a half as long as the 3rd ; antennular scale reaching to the end of 2nd joint. General distribution: Bay of Bengal, 240 and 609 fathoms (Alcock); Arabian Sea, off the Malabar coast, 172 fathoms, off the Sind coast, 609 — 620 fathoms. Leptochela Stimps. The genus Leptochela Stimps. includes at present 5 or perhaps 7 species, of which 3 or 5 are found in the Indopacific and 2 on the east coast of America. Lept. gracilis Stimps. is found in the seas of Japan, but has also been observed off the west coast of Korea. Lept. robusta Stimps. occurs near the Loo Choo Islands, in the Chinese Sea and in the Indian Archipelago, where this species was obtained by the "Siboga" at no less than fifteen Stations, while it was already known from Ternate; the distribution of this species seems, however, to be much wider, for it has been recorded as well from the Hawaiian Islands as from the Red Sea. Lept. pugtiax de Man, a new species of small size, was captured by this expedition off the Kei-islands and in the Bay of Bima. L^ept. aculeocaudata Paulson is known from the Red Sea and from Djibouti, but is regarded by Dr. Balss as a synonym of Lept. robusta Stimps. A species, finally, described in the Report on the Challenger Macrura under the name of Lept. robusta and 16 specimens of which were taken off East Moncoeur Island, Bass Strait, will perhaps once prove to differ from all other species. Lept. serratorbita Bate, which by its finely serrated or spinulous orbits differs from all the other species, occurs off the Virgin Islands and Porto Rico, while it is also known from Key West. The other species from the ï9 east coast of America is Lept. carinata Ortm., vvhich is distributed from off the mouth of the Tocantins, Brazil, to the Bahamas. The species of this genus are found in rather shallow water, the greatest depth recorded being 150 fathoms, at which a female with eggs of Lept. robusta Stimps. was dredged by the Siboga expedition, the same species was, however, also obtained on the reef and at inter- mediate depths. 1. Leptochela robusta Stimps. PI. III and IV, Fig. 7 — 7 x. Leptochela robusta W. Stimpson, in: Proc. Acad. Nat. Sciences Philadelphia, 1860, p. 43. Leptochela robusta J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesells. Bd. XXV, 1902, p. 902. Leptochela robusta M. J. Rathbun, in: U.S. Fish Commission Buil. for 1903, Part III, Wash. 1906, p. 929. Leptochela robusta H. Balss, Die Decapoden des Roten Meeres. I. Macruren. Wien 1915, p. 17. Leptochela robusta J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden, Dl. II, Afl. 3 en 4, 1916, p. 148. March 3031. Sailus Ketjil, Paternoster-islands. Plankton, surface. [3 very young specimens. April 3. 7°25'S., H7°5o'.5E. Plankton, surface to a depth of 10 m. 7 young specimens. April 8/12. Bay of Bima, near south fort. 55 m. Bottom mud with patches of fine coral sand. 1 young male. July 4. 6° 8' N., 1210 19' E. 275 m. Coralbottom. 1 female with eggs. July 56. Anchorage off Pulu Tongkil, Sulu-archipelago. 13 m. Lithothamnion- bottom. 1 young specimen. July 8. o°58'.5 N., 122° 55' E. Kwandang-bay-entrance. 75 m. Bottom hard sand, very fine. 1 young female with eggs. July 25/27. Anchorage off Lirung, Salibabu-island. Up to 36 m. Bottom mud and hard sand. 1 young male. August 5. i°o'.4S., I27°25'.3E. Bottom very fine, hard sand. 1 male. August 5 7. Anchorage off Laiwui, coast of übi major. Plankton. At night. 1 very young specimen. August 14. o°3'.8N., I30°24'.3E. North of Waigeu-island. 141 m. Bottom fine and coarse sand with dead shells. 61 specimens, 22 males and 39 females, that are all ova-bearing. August 22. 2°2S'.5S., I3I°3.3E. 118 m. Bottom hard, coarse sand. 1 young male. Sept. 511. Ambon. 54 m. Bottom mud, sand and coral. 1 young male. Sept. 20. 40 20' S., 122° 58' E. Between islands of Wowoni and Buton, riorthern entrance of Buton-strait. From 75 — 94 m. Bottom sand with dead shells. 1 young specimen. January 18, 1900. 8°39'.iS., I27°4'.4E. Anchorage south coast of Timor. 34 m. Bottom on the limit between mud and coral. Lithothamnion. 1 young male. January 2426, 1900. io0 14' S., I24°5'.5E. Anchorage off Noimini, south coast of Timor. Reef. 1 young male. Febr. 14 16, 1900. Anchorage East of Dangar Besar, Saleh Bay. Up to 36 m. Bottom sand, coral and mud. 4 young males. Like in Lept. carinata Ortm. (M. J. Rathbun, U.S. Fish Commission Bulletin for 1900, Vol. 2, Wash. 1901, p. 127), the carapace of the female is tricarinate dorsally, while that of the male is rounded. The ova-bearing females from Stat. 153 are all nearly of the same size, Stat. 37 Stat. 41 Stat. 47 Stat. 105 Stat. 109. Stat. 114, Stat. r33 Stat. 141 Stat. 142 Stat. 153, Stat. 166, Stat. 181 Stat. 204. Stat. 285, Stat. 296. Stat. 313. 20 32 or 33 mm. long from apex of rostrum to tip of telson, the length of the carapace, measured in the middle line, being one-third that of the abdomen-, the males are but little, 2 or 3 mm., shorter. The carapace of the male, which, like that of the female, is deeply emarginate posteriorly, appears, when measured in the middorsal line, one and a half as long as high, the carapace presenting its greatest height just in front of the posterior emargination ; it is smooth and shining and regularly rounded dorsally. The rounded upper border appears, in a lateral view, usually slightly convex, running obliquely downward to the tip of the rostrum, but sometimes quite straight and in one specimen the gastric region appears, just behind the rostrum, even slightly depressed ; the acuminate rostrum that reaches to the middle of the corneae of the eye-peduncles, or almost to the distal end of the latter, is obtusely and indistinctly carinate above and commonly slightly turned downward, while in those specimens, in which the dorsum is straight, it runs horizontally forward. In some individuals the tip of the rostrum is slightly curved upward. From the outer orbital angle which is rounded, the anterior border of the carapace runs slightly forward and downward and passes with a regular curve into the lower border; a little behind that border one observes a fine, short, longitudinal groove, separating the gastric from the hepatic region ; the cardiac region which passes into the gastric, is sometimes defined on each side by a fine, longitudinal, shallow groove from the branchial regions, but often this groove is not developed at all. The margin of the posterior emargination is flattened and more or less distinct from the upper surface of the carapace. In the female (Fig. "je) the median carina appears in the middle of the carapace com- pressed, though obtuse and low, along a distance of about 1,5 mm.; this narrow compressed part widens at the anterior third of the carapace and tapers then to the extremity of the rostrum and this widened anterior part of the carina is rounded. In the same manner the compressed median part of the carina gradually widens backward to the depressed margin of the posterior emargination and is here also rounded. The lateral carinae arise from the orbital margin just behind the eyestalks, run at first parallel or converge even a little backward nearly to the level of the middle of the compressed part of the median carina, but then slightly diverge backward to near the flattened border of the posterior emargination : in some specimens the lateral carinae are therefore straight, while in other ones they appear slightly concave on their anterior third. The lateral carinae are rather narrow, low, though blunt on their anterior third, but gradually widen backward and are here rounded. The two grooves by which the lateral carinae are separated from the median one, are shallow anteriorly and posteriorly, but somewhat deeper near the middle ; the lateral carinae are also bounded on the outer side by a shallow depression to near the posterior margin of the carapace, this depression becomes posteriorly deeper, more defined and triangular. As already observed by Miss Rathbun, the 5th abdominal somite is almost as a rule bluntly and indistinctly carinate, the posterior extremity, however, is unarmed; it was previously overlooked by Stimpson and by me. The 6lh somite, hardly shorter than the 5,h, is regularly rounded dorsally and carries at the base a broadly triangular, transverse prominence, which "is convex anteriorly and which, in a lateral aspect, looks like a low subacute tubercle. The posterior margin of the dorsal surface presents at either side a small narrow notch and close 2 I to it a small acute spine directed outward ; the lower borders of this somite end in an acute tooth and one observes, close to the latter, though already on the lower surface of the somite, a small spine, which is directed backward and placed near the posterior margin (Fig. je). Concerning the telson (Fig. 7 ƒ and jg), which in the adult female is 5 mm. long (without the terminal spines), I have remarked in my description of 1902 that the upper surface was armed with three pairs of spines and the tip with four: this was not quite right, for the tip is armed with five pairs. Of the 3 pairs of spines on the upper surface the anterior is situated in the adult female near the base, at about Yb °f tne entire length distant from the proximal extremity, the two spines are implanted near the middle line, 0,5 mm. long and 0,36 mm. distant from one another; the 2nd and the 3rd pair are implanted close to the margins of the telson, the 2nd pair situated at the anterior third and 0,44 mm. long, those of the 3ld pair just behind the middle, at 29/so °f tne length from the base, and these spines are 0,42 mm. long. The median spines of the posterior extremity i. e. those of the ist pair, are 0,54 mm. long, those of the 2nd pair 1,4 mm., the longest of all, those of the 3rd pair 1,16 mm., the spines of the 4"1 pair, implanted just in front of the 3rd, are 0,55 mm. long, the spines of the 5"1 pair, finally, are those that were overlooked by me in 1902; they are implanted between the 2nd and the 3rd pair, are slightly bent inward, 0,58 mm. long, reach hardly beyond the truncate extremity of the telson and are armed on both margins with similar small denticles as occur also on the inner margin of the other spines. The peduncle and the longer (outer) flagellum of the inner antennae measure together, in the adult female, about 21 mm., being about 3-times as long as the carapace, when measured in the dorsal median line (j1/^ mm.), while the outer flagellum is twice as long as the carapace: according to Stimpson the antennulae should be hardly longer than the latter. The scaphocerite of the adult female is 4 mm. long and 31/3-times as long as wide, presenting the greatest width at the posterior fourth or hfth; it has an elongate triangular form and, gradually narrowing distally, ends in a sharp spine, that is 0,18 mm. long. The mandibles are broad, flat, though slightly concave; their margin, which is not deeply cleft like in Lept. gracilis Stimps., is armed with 12 or 13 teeth that from before backwards decrease in size; the 5 or 6 anterior teeth are considerably larger than the rest, their form is somewhat variable and sometimes even difters in the two mandibles of the same individual, as in the two of the adult ova-bearing female from Stat. 153, figured Fig. ~/i and j/i'. In the right mandible of this specimen the 2nd tooth is the largest of all and bears a secondary denticle at the base of its posterior margin ; the 3rd and the 4th are subequal, smaller than the 2nd, a little larger than the ist; the 5"1 and the 6th are also subequal and only half as large as the two preceding, the following small teeth regularly decrease in size. In the left mandible the 2nd tooth is also the largest of all. but bears no secondary tooth: the ist tooth is but little smaller than the 2nd, the 3rd only half as large as the i5t, the 4,h almost of the same size as the ist, little smaller, the 5th nearly of the same size as the 3"1, while the remaining small teeth regularly diminish in size. In a male specimen from the same Station the ist tooth bore a small denticle on its outer margin and was of the same size as the 4lh ; the 2nd was twice as large, the largest of all, the yd a little smaller than the ist, the 5th somewhat smaller than the 3rd , while the 6th and following teeth were much smaller and oradually decreased in size. The single-jointed palp (Fig. J i) appears somewhat shorter with regard to its width than that of Lept. serratorbita (C. Spence Bate, Report Challenger Macrura, PI. CXXXIX, fig. ld), being just one and a half as long as wide-, the anterior margin is truncate and tipped with 12 or 13 feathered setae, while 3 are implanted on the middle of the slightly convex outer margin. The inner branch of the ist maxilla (Fig. 7/) has a conical shape with rounded tip, which is beset with 6 or 7 spiniform setae, while 2 or 3 occur on the margins; its form in Lept. serratorbita is somewhat different (Challenger Macrura, Fig. ie of Plate CXXXIX); the middle lobe is armed, on its antero-internal margin, with 7 or 8 spines and a much larger number of setae; the outer branch or palp, finally, has the same form as in Lept. serratorbita, but is single-jointed, the "bud-like" terminal joint of Bate being not separated from the rest. The 2nd maxilla (Fig. 7 k) much resembles that of Lept. serratorbita. Of the 3 inner lobes the anterior is quadrangular, but one-fourth longer than wide, with rounded angles; the middle lobe is not yet half as broad as the anterior, the proportion being as 7:3, its outer margin is also rounded or truncate, the posterior lobe, finally, is triangular with acute tip; the outer margin of the 3 lobes is closely fringed with feathered setae and there is a transverse row of 6 setae on the 2"d lobe near the base. Scaphognathite well developed, the anterior lobe wider than the posterior. The ist maxilliped (Fig. 7/, 7 m) much differs from that of Pasipluca Sav. In the first place the coxopodite and the basipodite are produced inward together as a prominent broad lobe, fringed with feathered setae on the outer margin, that bears a triangular notch or incision, so that it is divided into an anterior lobe, the basipodite, and a much smaller posterior, the coxopodite. The endopodite is also much more developed, its proximal half is much broader than the narrow distal half and covered with feathered setae on the convex outer margin. Beyond the rounded lobe of Boas the exopodite terminates in a broadly-foliaceous lobe, which is hardly one and a half as long as broad and fringed with long feathered setae. Epipodite very large, nearly as long as the exopodite. The 2nd maxillipeds (Fig. 7 n), that resemble those of Lept. serratorbita, differ also from those of Pasip/uza, because they are not pediform, the ischium and merus, as also the propodus, being much shorter and broader. The terminal or fh joint (Fig. 70) appears, however, as a proper dactylus, articulating, like in Pasip/ura, with the distal end of the propodus and not applied to it as a strip; the dactylus, a little broader than long and half as long as the propodus, terminates in a strong spine, one and a half as long as the joint itself, while both the outer and the inner margin of the latter are armed with 3 somewhat smaller spines and with a few setae ; all these spines are fringed, along their margins, with microscopical setulae. The propodus has an oval form, is one-third longer than broad and the convex outer margin is armed with 5 or 6 spines and a few setae, while the inner is nearly straight. The merus is about one and a half as long as wide and narrows a little towards the carpal articulation, the ischium, finally, measures two-thirds the length of the merus and is nearly as long as broad. There is no exopodite. Like in the male, also in the adult female the terminal joint (Fig. 7 g) of the external maxillipeds (Fig. ;ƒ) is 6-times as long as wide, its inner margin is thickly beset with setae„ while short setae are implanted on the outer; there are two longer setae at the distal end that measure about one-third the length of the joint. Both in the adult male and the ova-bearing female the lower margin of the palm of the ist pair of legs (Fig. - r) is armed with 4, rarely 3, spines, while the upper is unarmed; in the adult male the palm is 1,4 mm. long and 0,56 mm. broad, in the ova-bearing female 1,3 mm. long and 0,54 mm. broad, the palm being almost 3-times as long as broad, as I already indicated in my work of 1902. In both sexes the outer margin of the dactylus bears 4 or 5 spines, like in Lept. serratorbiia. Both in the male and in the female the carpus is 1 mm. long and 0,56 mm. thick distally, nearly twice as long as thick ; it is armed on the middle of the lower margin with 2 spines and at the distal end with 2 or 3, one of which is a little larger than the two preceding, while the two other spines are successively smaller. Merus, both in the male and in the female, 21/J-times as long as the carpus and 4-times as long as wide; its lower margin is armed in the male with 4, in the female with 5 spines, both the upper and the lower margin are setiferous and there are 5 or 6 setae at the far end of the upper. Ischium almost just as long as the merus, also about 4-times as long as wide, slightly narrowing towards the proximal extremity, setiferous, but not armed with spines, except one at the distal end of the upper margin. Basipodite setiferous along the lower margin, with a single spine at the distal extremity. Exopodite just reaching beyond the far end of the merus. The legs of the 2nd pair (Fig. 7 1) show the same form and relative measurements as those of the ist, but they are a little longer and a lit tle more spiniferous. Dactylus with 5 or 6 spines. The carpus is armed with 4 or 5 spines on the lower side of the distal margin in both sexes and with 3 or 4 spines on the lower margin. The lower margin of the merus does not carry 4 or 5 spines, but in the male 7 and in the female even 9 and one observes moreover on the distal margin of this joint in the male one, in the female two small spines, and behind them on the outer surface 2 small spinules. There are 3 spines near the lower margin of the ischium and one observes on the basipodite, besides a spine at the distal end, still two on the proximal half of the lower margin. The exopodite, nnally, is a little shorter than the ischium. The peraeopods of the 3rd pair of the adult male agree with my description of 1902, except in the following. The dactylus is not precisely as long as the propodus, but one-sixth longer and 1 2-times as long as wide in the mjddle. The propodus is armed along its lower margin with 5 slender spiniform setae that sljghtly increase in length distally and with 2 at the far end, of which the longer measures three-fifths the length of the propodus. The ischium that slightly widens distally, is just as long as the merus, 4-times as long as wide at the far end and armed along the lower border with 4 short spines, while long setae stand on the upper. On the lower border of the basipodite 3 slender spines are implanted and the exopodite is a little shorter than the ischium. The 3"1 legs of the female (Fig. jzi) agree with those of the male, but the propodus is almost twice as long as the carpus and furnished with 6 or 7 spiniform setae along the lower margin, besides the two at the distal extremity; the dactylus is sometimes nearly just as long as the propodus, but is also 1 2-times as long as wide in the middle. Exopodite just as long as the ischium. 24 Of the 4,h legs of the male the ischium, that is 0,9 mm. or 1 mm. long, is armed on the lower margin with a strong spine, 0,76 mm. long, almost as long as the joint itself; some fine setae, the longest of which reach to the far end of the merus, occur along the distal half of the upper margin. Merus 1,3 mm. long and 21/2-times as long as broad; there is a spine in the middle of the lower margin and another just before it, while posterior to the spines 5 or 6 long setae are implanted; a tuft of long setae occurs along the distal half of the upper margin. Carpus 1,04 mm. long, presenting the greatest width at the distal 6th, nearly twice as long as thick; on the lower side of the distal margin 4 or 5 short spines are implanted, that decrease in length towards the articulation, like also some long setae. Propodus hardly shorter than merus, nearly twice as long as broad, lower margin with long setae, shorter ones along the proximal half of the upper. Dactylus hardly shorter than merus, 5-times as long as wide, with 10 or 11 spiniform setae along the three distal fourth parts of the posterior margin. Exopodite extending to the middle of the merus. The 4th legs (Fig. jv) of the female resemble those of the male. In an adult ova-bearing female the ischium is 0,8 mm. long, 0,66 mm. broad, the large spine measures 0,82 mm.; the merus is 1,5 mm. long, 0,62 mm. broad, the carpus 1,2 mm. long, 0,55 mm. broad, the propodus 1,02 mm. long, 0,47 mm. broad, the dactylus, finally, long 0,86 mm., 0,24 mm. broad. A long slender spine, measuring 0,52 mm., occurs, in the 5th leg of the male, on the lower border of the basipodite, not far from the distal extremity; the ischium is 0,94 mm. long and 0,64 mm. thick, one and a half as long as thick; a short spine occurs at the distal end of the upper margin, like also a tuft of setae, that extend almost to the far end of the merus, the lower margin bears also some setae, while a short conical spine exists at the distal extremity, nearly of the same size as the spine on the upper border. The merus, 1,3 mm. long and half as broad, bears a tuft of long setae at the distal end of the upper margin, while there are 2 or 3 spines on the lower. The carpus, 1,35 mm. long and 0,42 mm. broad at the distal end, is as long as the merus and is about 3-times as long as broad; it is armed with 2 or 3 spines near the distal end of the lower margin, while several setae are implanted along this margin, of which 4 or 5 of the longest reach almost to the end of the dactylus. The propodus is 0,86 mm. long and 0,36 mm. wide, 2y3-times as long as wide; the lower margin is furnished with several long strong setae, that extend beyond the dactylus and the latter, 0,75 mm. long, slightly shorter than the propodus, bears 7 or 8 spiniform setae along the two distal thirds of the lower margin. In the female (Fig. 7 re) the basipodite of the 5th legs bears a long spiniform seta, twice as long as the spine that occurs here in the male ; there is no spine at the distal end of the upper border of the ischium, while the distal setae seem to be shorter than in the male and the spine at the distal end of the lower border is also smaller. Two spines are observe'd near the middle of the lower border of the merus, of which the posterior is a little longer than the other; these spines are longer and slenderer than the 2 or 3 that are here found in the male. The exopodite reaches to the middle of the ischium. Ova very numerous, small, 0,5 — 0,55 mm. long. The three specimens from Stat. ^ are nearly of the same size, hardly 7 mm. long; 25 they seem to belong to this species, but the spines on the lower surface of the 6,h somite are larger than in the adult, reaching to the posterior extremity of the lateral margins. The 7 young specimens from Stat. 41 agree with those from Stat. 37 as regards the lenoth of the spines on the lower surface of the 6th somite; the largest is about 17 mm. long, the rest are much smaller. The young male from Stat. 47 measures 19 mm., the spines on the lower surface of the 6th somite are already somewhat shorter than in the preceding younger specimens. The eo-cr-bearino- female from Stat. 105 is 18 or 19 mm. long, the spines on the lower surface of the óth somite are already small, like in the adult. The young sample from Stat. 109 measures hardly 15 mm., the carapace is rather much convex dorsally; it is no doubt a male, because the carinae are wanting. The ova-bearing specimen from Stat. 114' is only 11 mm. long, the ova, however, have the same size as in the adult female; the carinae on the carapace are well developed. The young male from Stat. 133 measures 18,5 mm., the male from Stat. 141 24 mm., in both the spines on the 6th somite are already nearly as small as in the adult. The young specimen from Stat. 166 is 13 mm. long; the spines on the 6th somite are large and reach almost to the posterior extremity of the lateral margins; this specimen differs also from the others by the outer orbital angle being rather acute, not rounded (Fig. 7 x), though a spine does not occur, and by the anterior margin of the carapace running from the outer orbital angle straight and vertically downward. The young male from Ambon is about 19 mm. long, spines of the 6th somite already nearly as in the adult. The young specimen from Stat. 204 is 1 21/, mm. long. The young specimen from Stat. 2S5 measures 13 mm. The carapace is not carinate, the appendix masculina on the 2nd pleopods rudimentary. The young male from Stat. 296 measures r.21/,, mm. Carapace not carinate, appendix masculina on 2nd pleopods already present. There are only 2 pairs of spines on the upper surface of the telson, behind the anterior pair only one pair occurs, in the middle. The 4 young specimens from Stat. 313 are all males, in each the 2Dd pleopods bear an appendix masculina. The youngest is 12 mm. long. The dactylus of the legs of the ist pair presents still only 2 spines, in this specimen, on the proximal half of its outer margin and 3 spines occur on the outer margin of the palm ; the 2 spines at the distal end of the carpus are already present, but there is only one on the outer margin. Merus little more than twice as long as the carpus, 0,96 mm. long and 0,27 mm. broad, not yet 4-times as long as wide and with 2 spines on the distal half; ischium and basipodite like in the adult. The dactylus of the legs of the 3rd pair is still shorter than the propodus, only 0,34 mm. long and 8-times as long as wide in the middle; the 4 setae at the distal extremity are already present. Propodus one and a half as long as the carpus, 0,42 mm. long and 0,09 mm. broad, its lower margin still only with 2 setae, but the two at the far end are already developed and the longer extends almost to the truncate tip of the dactylus. Carpus one-fourth of the merus, armed and shaped like in the adult. Merus 4,6-times as long as wide, with 5 spines on the lower margin, ischium SIBOGA-EXPED1TIK XXXIX a3. 4 26 still only with 3 spines on that margin, while the 3 slender spines on the basipodite are already developed. Legs of the 4th pair as in the adult. Merus 0,64 mm. long, 0,27 mm. broad, with 2 spines on the middle of the anterior margin, carpus long 0,52 mm. and 0,21 mm. wide, of the 4 spines on the distal margin only the two posterior are present; propodus 0,4 mm. long, 0,18 mm. broad, dactylus 0,34 mm. long. The exopodite reaches almost to the end of the ischium. Legs of the 5th pair like in the adult. The exopodite reaches to the middle of the ischium. As the tricarinate form of the carapace of this species was not yet described by any author, we may assume that only the male has hitherto been observed. The species, described by Spence Bate (Report Challenger Macrura) under the name of Lept. robusta, is evidently another, at fïrst sight distinguished by the spiniform outer angle of the orbits. As regards Lept. aculeocaudata Paulson of the Red Sea, Dr. Balss may be right when considering this form as identical with Lept. robusta Stimps. General distribution: Chinese Sea (Stimpson); Loo Choo Islands (Stimpson); Hawaiian Islands (Rathbun); Haddumati Atoll, Maldive Islands (Borradaile) ; Red Sea (Balss). 2. Leptoehela pugnax de Man. PI. IV, Fig. 8 — Srf. Leptochela pugnax J. G. de Man, in: Zoolog. Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel II, 1916, p. 148. \Leptochela robusta C. Spence Bate, Report Challenger Macrura, 1888, p. 862, PI. CXXXIX, figs- 3- 4- Stat. 4. March 9. 7°42'S., H4°i2'.6E. Anchorage off Djangkar (Java). 9 m. Bottom coarse sand. 1 adult male and 1 young specimen. Stat. 41. April 3. 7°25'S., U7°5o'.5E. Plankton, surface to 10 m. 1 young male. Stat. 47. April 8/12. Bay of Bima, near south fort. 55 m. Bottom mud with patches of fine coral sand. 2 males. Stat. 258. Dec. 12/16. Tual-anchorage, Kei-islands. 22 m. Bottom Lithothamnion, sand and coral. 1 ova-bearing female. Stat. 261. Dec. 16 18. Elat, west coast of Great-Kei-island. 27 m. Bottom mud. 1 female without eggs. A species of small size : the ova-bearing female is 14 mm. long from apex of rostrum to tip of telson, the other specimens are of the same size or a little younger. In the larger male from Stat. 47 the acuminate rostrum reaches, beyond the eyes, to the distal extremity of ist antennular article; it arises with a rounded carina nearly at the anterior third of the carapace and is at first slightly directed downward to the middle of the corneae, while the rest is a little upturned; the rostrum proper is slightly compressed, though it is blunt and obtuse above. Posterior to the rostral carina the carapace, which is 4 mm. long, measured in the middorsal line, is smooth and rounded, the posterior emargination is as large as in Lept. robusta, its margin depressed, obvious. Otherwise than in the male the carapace of the female appears, like in Lept. robusta Stimps. and Lept. carinata Ortm., tricarinate dorsally. The rostrum, more compressed than in the male, has for the rest the same form and length; the rostral carina is continued backward almost along the whole length of the carapace, viz. to the posterior seventh, where it gradually widens and passes into the upper surface of the carapace; the carina is compressed, subacute 27 in the middle, more obtuse anteriorly and posteriorly and not depressed in the middle, so that the upper border appears straight in a lateral view. The lateral carinae are straight, parallel with the middorsal crest; they are rounded, but, properly speaking, must be regarded as the lateral borders of the longitudinal grooves that exist on each side of the median carina, because they are not defined by any groove or depression on the outer side. Like in Lept. gracilis Stimps. and in the form from Bass Strait, described in the Report on the Challenger Macrura under the name of Lept. robusta, the outer orbital angle terminates in a small acute spine, that is directed forward and the lower margin of vvhich makes a right amde with the anterior border of the carapace; this spine is in the male a little larger than in the female. Anterior margin of carapace setiferous, antero-inferior angle obtuse. In its general form the abdomen resembles that of Lept. robusta Stimps. The 5th somite (Fig. Sa) has the same shape, slightly compressed, the upper margin is blunt, but not carinate, its posterior extremity unarmed. The pleura of the 4th and 5 th somite of the male carry a small obtuse tooth at the anterior end of their lower margin, but the posterior extremity is obtuse; in Lept. robusta, however, the antero-inferior angle of the pleura of these somites is rounded, without any tracé of a tooth, while the postero-inferior angle of the pleura of the 5th somite is acute, dentiform. In the female specimens, however, this small tooth on the lower margin of the 4th and 5lh pleura does not occur. Sixth somite as long as 5th and twice as long as wide in a lateral view, posterior and postero-lateral margin like in Lept. robusta Stimps. ; the posterior margin on each side with a small spine, foliowed laterally by the postero-lateral angle, which is separated by a semicircular emargination from the subacute posterior extremity of the lower margin. The transverse tubercle at the base of the upper surface is little prominent. While one observes in Lept. robusta Stimps., near the posterior border of the lower surface of this somite, on each side but a small tooth, L^ept. pugnax is armed, on the lower surface, on each side with a long, slightly curved, acuminate spine; this spine, that measures about one-fourth of the length of this somite, is implanted close to the lateral margin at the posterior third and reaches almost as far backward as the posterior extremity of that margin. The telson, 2,1 mm. long in the ova-bearing female, just one and a half as long as the 6th somite, shows the same shape and measurements as that of Lept. robusta Stimps., but the upper surface is only armed with 2 pairs of spines. The spines of the basal pair are 0,25 mm. long and 0,16 mm. distant from one another, i.e. one-fourth the width of the telson, while they are implanted at the anterior ninth ; the posterior pair occur just behind the middle, close to the lateral margins, and these spines are 0,17 mm. long. The armature of the tip with 5 pairs of spines is exactly the same as in Lept. robusta Stimps. and here also the margins of these spines are fringed with small denticles, except the outer margin of the spines of the 2nd and 3rd pair; the median spines, i. e. those of the ist pair, are 0,32 mm. long, those of the 2ncl pair 0,66 mm., those of the 3ld pair 0,58 mm. and hardly reaching beyond the median spines; the spines of the 4th pair are 0,33 mm. long and reach just beyond the extremity of the telson, the spines of the 5th pair, hnally, implanted between those of the 2nd and 3rd, extend to the middle of the median spines and are 0,3 mm. long. The inner uropods reach backward as far as there where the spines of the 4th pair are implanted; they are fringed on both margins 28 with long fcathered setae, while 4 slender subequal spines exist at the extremity of the outer margin close to one another. The outer uropods, that are hardly shorter, are armed on their outer margin with 10 or 11 spines and just inside the spine at the postenor extremity another occurs, which is 2 or 3-times as long and slightly arched. Eye-peduncles short and stout, the dark slate-coloured corneae occupy more than half the length of the peduncle. The antennular peduncle reaches to the distal third of the scapho- cerite. First article enlarged externally along its proximal half and from this enlarged part arises the pointed, spiniform stylocerite, which is just as long as the ist article; this article, which on its proximal half appears almost as wide as it is long, bears, just in front of the eyes, on its upper surface near the far end a spiniform seta, directed upward. Second antennular article half as long as first and as long as thick, 3rd nearly one and a half as long as 2nd. The scaphocerite, in the ova-bearing female 1,65 mm. long, is 4-times as long as wide, appears widest at the proximal 6th and hence gradually narrows, terminating in a short spine, 0,09 mm. long, x/ih tne length of the scaphocerite; outer margin slightly concave. The external maxillipeds much resemble those of Lept. rodusta Stimps., but the terminal joint is a little shorter (Fig. 8 6) in proportion to the penultimate and the longer of the two setae at the far end of the terminal joint is a little longer with regard to the length of this joint. In the ova-bearing female from Stat. 258 the penultimate joint is 0,76 mm. long, the terminal joint 0,54 mm. long and 0,1 mm. broad, the longer seta at the distal end 0,32 mm.; in the youngest male of Lept. roöusta Stimps. from Stat. 313 these numbers are, in the same succession, 0,9 mm., 0,74 mm., 0,135 mm. and 0,33 mm. Like in Lept. robusta Stimps. the exopodite reaches just beyond the far end of the antepenultimate joint. The thoracic legs also much resemble those of Lept. rodusta Stimps. 1). The measure- ments of the legs of the female from Stat. 261 are the following. Merus of ist pair 5-times as long as wide, lower margin with 3 slender spines, that are half as long as the merus is wide, along the distal half and with some setae. Carpus almost half as long as the merus, twice as long as wide at the distal end, with 5 setae along the lower margin and a spine at the fal- end of it. Chela a little more than 3-times as long as the carpus ; the palm which is a little more than half as long as the fingers and a little more than twice as long as broad, bears a spine at the distal end of the lower margin, on which 4 setae are implanted; 3 or 4 spiniform setae on the dactylus near the base. Leg of 2nd pair (Fig. 8 e) more spiniferous than those of ist, like in Lept. rodusta Stimps. A slender spine at the far end of the lower margin of the basipodite and two similar spiniform setae behind it at equal distances. Upper margin of ischium with several setae, a slender spine and a few setae at the distal extremity; lower margin with a spine in the middle and with another at the proximal third or fifth. Merus one-third shorter than ischium, 3,5 — 3,6-times as long as wide, lower margin with a spine near the proximal and another near the distal extremity, also one in the middle and with some setae between them ; upper margin also setiferous. Carpus a little longer than one-third of the merus and in the middle a little wider than half the length ; lower 1) In the diagnosis of Lept. pugnax (1. c. 1916, p. 149) the peraeopods are erroneously said to be of a more slender form. 29 mannn with 2 spines and a few setae, while 5 or 6 unequal spines are implanted on the lower half of the distal margin. Chela 4-times as long as the carpus, palm half as long as the fingers, nearly half as wide as long; a spine at the far end of the lower margin, another in the middle, like also a few setae. Fingers Hke those of ist pair. Basipodite of 3rd legs (Fig. 8d) with 2 spiniform setae on the upper margin. Ischium slender, with 3 spines on the lower margin, one at the distal fifth, one a little behind the middle and one near the base ; 4 or 5 strong long setae along the distal and some shorter ones along the proximal half of the upper margin. Merus a little more than half as long as the ischium, lower maro-in fringed with setae and with 3 spines, one not far from the distal extremity, the other at the posterior third, the last near the base. Carpus one-third of the merus, half as thick as long, lower margin with 6 long setae, that increase in length and of which the longest, at the far end, reaches beyond the middle of the propodus; there is also a strong spine, about half as long as the carpus, at the distal extremity. Propodus one and a half as long as the carpus, almost 5-times as long as wide, lower margin fringed with 10 long setae, resembling those of the carpus, upper margin also setiferous. Dactylus two-thirds of the propodus, nearly 5-times as long as wide, both margins with a few setae and three setae at the distal extremity, of which the longest is somewhat longer than the dactylus itself. Basipodite of 4"1 pair with a strong spine, like in Lept. robusta Stimps. Ischium a little more than twice as long as wide, merus nearly as long as the ischium, carpus one-fourth shorter than merus, propodus little more than half as long as the carpus, merus, carpus and propodus almost 3-times as long as wide-, dactylus one-third longer than propodus. All the joints of this leg are fringed on both margins with long stiff setae. Basipodite of the legs of 5th pair with a short spine and a spiniform seta, which is twice as long. Ischium with a spine at the far end of the lower margin. Merus almost 3-times as long as wide, carpus nearly as long as the merus, about 3-times as long as wide distally, propodus a little more than half as long as the carpus, hardly more than twice as long as wide, dactylus one-third longer than propodus, slightly arched, slender, tapering to the acuminate extremity, 5-times as long as broad at base. The margins of this leg are fringed with long stiff setae. The ova of the female from Stat. 258 are 0,4 — 0,5 mm. long and a little less broad. In bis work on the Macrura of the Challenger Expedition, p. 862, PI. CXXXIX, fig. 3 and 4 sixteen specimens, males and two egg-bearing females, from off East Moncoeur Island, Bass Strait, were referred by Spence Bate to Lepi. robusta Stimps., in my opinion wrongly. Unfor- tunately the author confined himself, besides to a few remarks of little importance, to the translation of Stimpson's diagnosis, in which the words "carapax ecarinatus" were translated by "carapace carinated", a fault already indicated by Dr. Ortmann in his work "Decapoden und Schizopoden der Plankton-Expedition", 1893, p. 41. According to the figures 3 and 4, however, the species from Bass Strait differs from Lept. robusta Stimps. by the outer orbital angle being spiniform, not unarmed, obtuse; in fig. 3, the female, the antero-inferior angle of the carapace appears moreover also sharp, but in fig. 4, the male, obtuse, a difference to which I have already called attention in 1902 (Abhandl. Senckenb. Naturf. Gesells.). Bate's species differs, however, also from Lept. pugnax by its larger size, by the rostrum which is not turned upward 30 but downward, by the 6th somite of the abdomen being not armed with the large spine, characteristic of this species. Relying on the words "carapace carinated" of Bate's translation, we must assume that this is indeed the case in the south-australian Leptoeliela, though in the figfures the carination is not visible. '6 3. Lep toe hela sp. Stat. 7. March 11. 7°55'.5S., H4°26'E. Reef. 1 young specimen. Stat. 43. April 45. Anchorage off Pulu Sarassa, Postillon Islands. Depth up to 36 m. Bottom coral. 1 young specimen. Stat. 1S1. Sept. 5/11. Ambon. 54 m. 1 young specimen. These three specimens are all very young, that from Ambon is about 1 1 mm. long, the two others 8 or 9 mm. : they must probably be considered as varieties either of Lept. pugnax or of Lept. robusta. In the specimens from the Stations 7 and 43 the outer orbital angle is spiniform, but the spine is smaller than in Lept. pugnax, there is, however, also a short spine at the antero-inferior angle of the carapace. In both the rostrum is slightly upturned and reaches in the specimen from Stat. 7 just beyond the distal extremity of ist antennular article, in the other almost to that extremity. The two spines on the lower surface of the 6th somite are implanted more backward than in Lept. pugnax and are as long as in young specimens of Lept. robusta from the Stations 37, 41 and 166, reaching to the posterior end of the lower margin; in both specimens two other somewhat shorter and thinner spinules of equal size are observed on the lateral margin of the 6th somite, one at the anterior third, the other in the middle. In the young specimen from Ambon the spine at the outer orbital angle has the same size as in Lept. pugnax, the antero-inferior angle of the carapace is rounded, but the spines on the lower side of the 6th somite, though implanted on the same place as in L^ept. pugnax, are much shorter, nearly as in Lept. robusta. Superfamily STYLODACTYLOIDA. Family Stylodactylidae. Stylodactylus A. M.-Edw. The family Stylodactylidae, characterized by the second maxillipeds, of which the ischium and the tnerus seem to be coalesced to one joint, while the propodus seems to carry, according to a suggestion of Dr. Calman, a process that has become movable, so that in these maxillipeds tvvo joints look as if articulating with the preceding one, and furthermore by the two first pairs of legs, in which, according to the Rev. Stebbing (South African Crustacea, Part VII, 19 14, ]). 50), "the palm has dwindled to the shortest span, and the long slender setose fingers lie so closely one upon the other that the ordinary function of chelae as grasping organs seems almost out of the question" this family now contains at present six or seven species. The West Indies are inhabited by two, viz. Stylod. scrratus A. M.-Edw. 1881, the first described of the family, and Stylod. rectirostris A. M.-Edw. 1883. Stylod. serratus was discovered by A. Agassiz off the island of St. Domingo at a depth of 524 fathoms and was afterwards taken by the U. S. Coast Survey Steamer "Blake" off the islands of Martinique and Nevis in 334 and 356 fathoms ; according to the Rev. Stebbing this species should also occur off East London, Cape Colony, at a depth of 300 fathoms. The other, Stylod. rectirostris^ was obtained, also by the expedition of the "Blake", off St. Lucia at 116 fathoms: this form was figured by A. Milne- Edwards in the "Recueil de Figures de Crustacés nouveaux ou peu connus" of April 1883, but has never been described. Stylod. discissipes Bate 1888, with which Stylod. orientalis Bate 1888 is probably identical, occurs in the Pacific and was taken north of the Kermadec Islands at a depth of 600 fathoms and off the Hawaiian Islands in 230 to 53 fathoms. A nother indopacific form is Stylod. bimaxillaris Bate 1888, taken by the "Challenger" off the Admiralty Islands at a depth of 1 50 fathoms, but also recorded from the Sagami Bay, Japan, where a female was obtained in 82 fathoms. The third indopacific species is Stylod. Amarynthis de Man, which is at present known from four different localities of the Indian Archipelago, the fourth and last, finally, the new Stylod. Sibogac de Man from the Sulu Sea taken at a depth of 285 fathoms. 32 LIST OF THE SPECIES OF THE GENUS STYLODACTYLUS A. M.-Edw., KNOWN AT PRESENT. SPECIES HABITAT DEPTH IN FATHOMS Amarynthis de Man 1902 . . bimaxillaris Bate 1888 . . . . discissipes Bate 1888 orientalis Bate 1888 rectirostris A. M.-Edw. 1883 serratus A. M.-Edw. 1881 . . Sibogae de Man 19 18 Ternate Between the islands of Wowoni and Buton Bay of Pidjot, Lombok Near 7°o'S., i20°34'.5 E. Off the Admiralty Islands Sagami Bay, Japan North of the Kermadec Islands Hawaiian Islands North of the Kermadec Islands St. Lucia Off St. Domingo Off Martinique Off Nevis, Antilies East London, Cape Colony Sulu Sea 41 — 51 5—12 164 — 218 150 82 600 230 to 53 600 116 524 334 356 300 285 1. Stylodactylus Amarynthis de Man. PI. V, Fig. 9 — 9//. Stylodactylus sp. {amaryntliis) J. G. de Man, in: Abh. d. Senckenb. naturf. Gesellschaft, Bd. XXV, 1902, p. 897, Taf. XXVII, fig. 64. Stat. 33. March 24/26. Bay of Pidjot, Lombok. 9 — 22 m. Bottom mud, coral and coralsand. 1 young specimen. Stat. 65a. May 6. Very near Stat. 65 (7°o'S., 1200 34'. 5 E.). 300 — 400 m. Bottom pale, grey mud, changing during haul into coral bottom. 1 very young specimen. Stat. 204. Sept. 20. 4°2o'S., 122° 58' E. Between the islands of Wowoni and Buton, northern entrance of Buton-strait. Depth from 75 — 94 m. Bottom sand with dead shells. One egg-bearing female. Stylodactylus Amarynthis was founded in 1902 on an evidently young specimen from Ternate, the egg-bearing female from Stat. 204, however, must no doubt be referred to the same species, because the differences from the original description, chiefiy as regards the characters of the rostrum, are certainly owing to this female being adult and full-grown. The female from the northern entrance of Buton-strait is 20,2 mm. long from the extremity of the rostrum to tip of telson, just one and a half as long as the specimen from Ternate. The rostrum, 5,7 mm. long, measured from the orbital margin, is just twice as long as the rest (2,8 mm.) of the carapace, when measured dorsally ; it is sloping downward for about two-thirds its length, while the distal third slightly ascends upward, though the acuminate apex does not extend to the level of the upper border of the carapace. The height of the rostrum along the basal half is */„ o( its length, but nearly from the middle it gradually narrows to the extremity. The upper margin (Fig. 9^) is armed with 14 spines, the lower with 5; the three anterior spines of the lower margin are slightly larger than the two preceding and than 33 the spines of the upper and all the spines apparently articulate with the rostrum. Four spines are placed behind the orbit, the i5t is a little smaller than the three following, its distan ce from the 2nd is just as long as that between the 2nd and the 3rd, but the 3ld is twice as far distant from the 4"1 as from the 2nd; the 5th spine is twice as far distant from the 4th as the 4th from the 3rd and the intervals between the 4th and the 5th, the 5th and the 6,h and the 6th and the 7,h are equal. The Sth spine is a little longer than the 7th and implanted close to it, then follows again a longer interval, for the 9th spine is one and one-third as far distant from the 8th as the 7th from the 6th; the distance between the ioth and the 9th is little more than one- third of the distance between the oth and the 8th, but the 1 ith spine, a little smaller than the preceding and than the following, is as far distant from the ioth as the 9th from the 8th; the intervals between the four distal teeth are subequal, the distance between the two middle ones beino- a little larger than the distances between the iith and 12"1 and between the i3th and i4th spine, while the iith spine is as far distant from the i4th as from the ioth. The anterior spine, finally, is twice as far distant from the apex of the rostrum as the 1 2th spine from the 1 Vh- The posterior spine of the lower margin is implanted opposite the 7th of the upper and the distances between the following gradually increase in length ; the 2nd spine is placed a little before the 8th of the upper margin, the 3rd just before the 9th, the 4th midway between the io,h and the iith, while the foremost spine is placed opposite the penultimate of the upper margin. The carapace which is almost as high as long when measured dorsally, appears rather flattened above, especially the cardiac region, and the rostrum does not arise with a carina. Cervical groove shallow though distinct. Supraorbital spine situated a little below the 4lh spine of the upper margin of the rostrum and reaching just beyond the orbital margin ; outer orbital angle obtuse-, the antennal spine that one observes close to and just below the outer orbital angle, is a little smaller than the supraorbital spine, there is, finally, a third spine directed forward and slightly downward at the antero-inferior angle of the carapace. Hepatic groove short, but continuing as a shallow groove towards the antero-inferior angle of the carapace. Orbital furrow rather indistinct. Lower border of carapace with feathered setae. Apart from the characteristic spinulation of the pleura (Fig. gó) and perhaps also from the shape of the telson, the abdomen closely resembles that of Stylod. bimaxillaris Bate: I say perhaps, because the telson of this species has not yet been figured, while the description is rather incomplete. The abdomen is 11,7 mm. long, 4-times as long as the carapace without the rostrum and nearly one-third longer than carapace and rostrum taken together. The abdomen is not compressed, so that the ist and 2nd terga and the anterior half of the 3rd are more or less flattened, while the terga of the 4"1, 5lh and 6th somite are rounded. The upper border of the 3rd tergum which in the young specimen from Ternate (J. G. de Man, 1. c. Fig. 64 tf) runs almost straight, appears in the adult specimen distinctly convex, like in Stylod. bimaxillaris. The 4th tergum, long 1,08 mm., appears, like in this species, about half as long as the 3rd, the upper border of the 5th is a little more than half as long (0,62 mm.) as the 4th, the 6th tergum, finally, 1,76 mm. long, is a little more than one and a half as long as the 4th and 3-times as long as the 5th, while the telson, about as long as the two preceding terga combined, is one and a half as long as the 6th somite. The general arrangement of the small spines or SIBOGA-EXPEDIT1E XXXIX a3. 5 F Ia, 34 teeth with which the pleura are armed, is substantially the same as in the young individual from Ternate, but owing to the female from Buton-strait being adult, the number of spines is a little greater or they are a little larger. The pleura (Fig. gö) of the ist somite are armed with 7 or 8 spines, 3 on the lower half of the anterior margin and 4 or 5 on the lower margin, arranged in two pairs that are separated by a somewhat larger interval. Six small spines occur anterior to the concave emargination of the lower margin of the 2nd pleura and four posterior to it, a somewhat larger spine exists on the lower half of the anterior margin and on that of the posterior : these two spines are directed downward. Eight or nine small, somewhat unequal spines are observed on the arched lower margin of the pleura of the 3rd somite, a larger spine, turned downward, is seen on the lower half of the posterior margin. Three small spines only exist on the lower border of the 4th pleura, between which one observes a few small prominences ; a much larger spine, turned downward, occurs on the lower half of the posterior margin and this spine is also comparatively considerably larger than in the young specimen from Ternate. The narrow pleura of the 5th somite are beset inferiorly with 3 spines, that increase in length from the anterior to the posterior, so that the latter is 3-times as long as the former. The 6th somite which in a lateral view appears twice as long as high and, looked at from above, twice as long as broad, is armed on each side with three spines. When it is looked at from above, one observes one spine, turned backward and somewhat outward, at the outer angles of the slightly arched posterior margin, a second, directed laterally and slightly backward, at the anterior third of the somite and this spine is implanted on the lateral side of the latter, not far from the lower border. The third spine, that is also directed laterally and a little backward, is implanted, at the level of the anterior margin of the basal joint of the uropods, close to the lower border of the somite. The telson (Fig. ge), 2,8 mm. long, one and a half as long as the 6,h somite and still a little longer than the 5th and the 6th taken together, resembles that of the young specimen from Ternate. At almost one-fourth its length from the base the telson shows its greatest width of 1,04 mm.; between this point and the base the lateral margins are a little concave, while posteriorly they strongly converge towards the tip. The telson ends (Fig. gd) posteriorly in an acute median spine, 0,1 mm. long, on either side of which 3 articulating spines are implanted; the ist next to the median spine, beyond which it reaches by about half its length, is 0,29 mm. long, the 21,d, 0,5 mm. long, is the longest of all and extends by more than half its length beyond the median spine, the 3vd, finally, 0,2 mm. long, is the shortest of the three and implanted at the posterior extremity of the lateral margins; from these extremities the lateral margins of the tip run obliquely to the median spine and the telson is here 0,33 mm. wide, one-third the greatest width anteriorly. The upper surface is broadly grooved from near the base to the tip and the 5 pairs of spinules are implanted on the borders of the groove. The spines of the ist or anterior pair, 0,17 mm. long, are placed at one-fourth the length of the telson from the base, each spine twice as far distant from the middle line as from the lateral margins. The distance of the spinules of the 2nd pair from the base measures about one-third, viz. 5/h) of the length of the telson and these spinules are just as far distant from one another as those of the ist pair and are therefore placed a little closer to the lateral margins. The 35 spinules of the 3"1 pair are placed, close to the lateral margin, nearly on the middle of the telson, at I3/38 its length from the base, those of the 4,h pair at the posterior third and those of the 5th pair, finally, are implanted near the lateral borders a little farther distant from the tip than from the 4th pair: the spinules of the four posterior pairs are as long as those of the foremost pair. The otiter uropods, just as long as the inner, are hardly shorter than the telson. The anterior border of the basal joint terminates laterally in an acute spine. The outer margin of the exopodite runs like a S, slightly convex anteriorly and armed here with 3 or 4 small, articulating spinules, slightly concave posteriorly and terminating in a small spine ; at the inner side of this spine on the posterior margin another is observed, that is a little longer though also immobile and next to this a third articulating spine occurs, which is still a little longer. The rounded posterior margin passes with a regular curve into the inner margin and both are fringed with long feathered setae. The inner uropod is anteriorly almost just as broad as the outer but then suddenly narrows, while the outer border curves inward. The outer uropod is almost 3-times as long as wide in the middle, the inner 4-times; both the inner and the outer margin of the inner uropod are fringed with long feathered setae, except at the anterior enlarged part and a few feathered setae are implanted on the anterior half of the upper surface. According to the description of 1902 in the young specimen from Ternate the inner uropod did gradually narrow from before backwards and was only twice as long as wide in the middle. The eyepeduncles, half as long as the carapace without the rostrum, extend to a little beyond the middle of basal antennular article; they are twice as long as the eyes are thick and the latter are provided with a small black ocellus, but not with a crown of long hairs as is the case in Stylod. èimaxillaris, according to Dr. Balss (Beitrage zur Naturg. Ostasiens. Ostasiatische Decapoden II. Die Natantia und Reptantia. München 1914, p. 27). There is a small forwardly directed spine on the upper border of the peduncle midway between the base and the cornea. The antennular peduncle is nearly as long as the carapace without the rostrum and reaches about to the middle of the latter; the basal joint measures three-fourths the entire length of the peduncle and the stylocerite that is separated from the peduncle by a narrow interspace, is flattened, while its outer margin ends in an acute spine that reaches about to the middle of the peduncle, though it is shorter than the eyestalk. Second joint very short, measuring only Ys or Yo the length of basal article; it is a little broader than long and a spine, which is as long as the joint itself, is implanted at the distal extremity of the outer margin. The 3rd joint is one and a half as long as the 2nd and at the far end of the outer margin a similar spine occurs, which is a little longer than that of the 2nd joint. Inner flagellum 2,7 or 2,8 mm. long, as long as the carapace without the rostrum, hardly reaching beyond the latter; it seems to be composed of 13 or 14 articles and appears narrow and thin when looked at from above, but thicker in a lateral aspect. Outer flagellum a little shorter, much thicker though tapering distally, 1 3-jointed, the 3 or 4 terminal joints appearing narrow when looked at from above ; olfactory filaments well developed, long. Basal joint of outer antennae with a strong spine at the outer angle. Scaphocerite (Fig. ge) 36 3,5 rnm. long, one-fourth longer than the carapace without the rostrum, a little shorter than the latter; it is of a narrow shape, resembling a scimitar, the width being only one-seventh the length, and from the posterior third it gradually narrows, ending in an acuminate spine; the very concave outer margin is armed with 8 or 9 articulated spines, while the arched inner margin is fringed with long feathered setae. Antennal flagellum probably but a little more than half as long as the body. The measurements of the 2nd maxillipeds (Fig. gf) differ from those of Stylod. bimaxillaris Bate (Report Challenger Macrura, 1888, PI. CXXXVIII, fig. 3//): these appendages are probably characteristic for each species of the genus. The long third joint, which consists .probably of the two joints ischium and merus coalesced to one, is 1,22 mm. long, when measured along the outer margin, and 0,37 mm. broad in the middle, whence it slightly narrows towards both extremities; the following joint, evidently the carpus, is 0,35 mm. long and 0,27 mm. wide anteriorly; the next joint, which, like in Stylod. bimaxillaris, somewhat widens distally, is 0,96 mm. long, 0,44 mm. wide distally and 0,26 mm. proximally. The longer one of the two terminal joints is 0,75 mm. long and shows its greatest width of 0,26 mm. in the middle, being 3-times as long as wide-, the inner margin runs slightly S-like, the outer is rather strongly arched; the other joint is 0,52 mm. long and half as wide in the middle, narrows, like the longer joint, towards both extremities, the inner margin is straight, the outer very convex. While in Stylod. bimaxillaris the joint, that follows the carpus, is only half as long as the third joint, in Stylod. Amarynthis it is much larger and measures four-fifths of the latter; the 3rd joint appears in Stylod. bimaxillaris of a more slender form and, while in Bate's species the longer of the two terminal joints shows a greater length than the preceding joint, in Stylod. Amarynthis it is shorter, measuring only about three-fourths of the probable propodus. The exopodite is 2,05 mm. long and reaches by the distal third of its length beyond the 3rd joint, while in Stylod. bimaxillaris it is only as long as this joint. As regards the long feathered hairs with which this maxilliped is provided, both species resemble one another, but in Stylod. Amarynthis only the two distal fifths of the exopodite are setiferous and those at the distal extremity are 1,2 mm. long, much longer than in Bate's figure. The external maxillipeds extend by a little more than their terminal joint beyond the rostrum. The upper margin of the antepenultimate joint is unarmed and nearly glabrous, but on the middle of the outer surface 9 or 10 small spines are implanted, of which that on the distal extremity is a little longer than the preceding; the penultimate joint, which is 3,45 mm. long and 0,24 mm. wide, 14-times as long as wide, is armed with 4 or 5 small spines along the proximal half and with a somewhat longer spine, long 0,2 mm., at the distal extremity of the upper margin, a row of a dozen similar spines, 0,16 — 0,2 mm. long, are moreover implanted on the outer surface near the latter; the terminal joint, 2,92 mm. long, a little shorter than the penultimate, is 0,17 mm. wide at the base, from where it slightly tapers to the rather obtuse extremity; this joint is of a more narrow form than the penultimate and not spiniferous, its upper margin bears a few short hairs, but the lower margin is fringed with long setiferous setae, like the lower margin of the preceding joints. The ist pair of peraeopods extend by a little more than half the length of the fingers 37 bevond the rostrum, while the merus reaches as far forward as the antennal peduncle. The merus is apparently coalesced with the ischium to one single joint, that is 3,35 mm. long; the upper margin of this joint is glabrous and unarmed, but 9 or 10 articulating spines are implanted on the middle of the outer surface, of which spines one in the middle of the joint and one at the far end are a little larger than the rest. The carpus is 3,25 mm. long and nearly 12-times as lono- as wide in the middle, while it is a little wider at the distal extremity, where it is 0,3 mm. broad; the upper margin is armed with 9 spinules, of which the spine at the distal extremity, 0,2 mm. long, is the longest of all and almost as long as the joint is here wide, 9 partly somewhat longer spines are implanted on the outer surface near the upper margin. Chela 2,95 mm. long, a little short er than the carpus; the very short palm, which is only 0,34 mm. long, appears in a lateral view near the articulation of the fingers 0,38 mm. broad and its posterior border is distinctly emarginate. The fingers are equal and in a lateral view gradually narrow to the apex, that is not acute, but obtuse, and 0,06 mm. broad; their upper border bears a few very small spinules, near each of which a short hair is implanted ; in front of the described notch the posterior border bears a tuft of feathered, spiniform setae, while that border is fringed along its whole length with feathered setae, which at the base of the finger are 3 mm. long, at the apex 1,5 mm. The legs of the 2nd pair are only as long as the rostrum. The coxopodite is armed with a spine at the far end of the posterior border. Like in the ist pair ischium and merus seem to be united to one joint, that is 3,2 mm. long and 11-times as long as wide in the middle; the upper margin is glabrous and unarmed, except a spine, long 0,21 mm., at the distal extremity, while one observes a row of 5 spines on the outer surface, placed at unequal distances. The carpus is 2,65 mm. long and 0,25 mm. broad in the middle, 10 — n-times as long as broad and a little widened at the distal extremity, like in the ist pair; upper margin with 7 or 8 spines, while there is moreover a row of 7 spines on the outer surface near the upper margin. Chela 2,66 mm. long, just as long as the carpus; the propodus, which is less deeply notched posteriorly than in the i5t pair, is 0,27 mm. broad in a lateral view, one-tenth the length of the chela, for the rest the chela resembles that of the ist pair and like in this all the joints are fringed with long feathered setae along the posterior border. The three posterior legs are of a stout shape, those of the 31'1 pair are a little shorter than the scaphocerite; they slightly decrease in length, so that the legs of the 5th pair reach only by their dactyli beyond the antennal peduncle. It remained doubtful whether also in these legs ischium and merus are coalesced to one joint or not. The meri that decrease in thickness from the 3rd to the 5th, are unarmed, excepting a strong spine at the far end both of the upper and the lower margin, but there are on the lower a few brownish, stout, feathered setae of moderate length. The carpi of the 3rJ pair are 1,35 mm. long, measured along the anterior margin, which is armed with a small spine just beyond the middle and a smaller one just behind the middle; 4 or 5 spines are implanted on or near the posterior margin and one at the far end of the outer surface. The slightly curved propodi are 2 mm. long and 6 or 7-times as long as wide; their posterior margin is armed with 8 articulating spines, which from the ist or posterior to the anterior somewhat increase in length, those on the distal half of the margin 3§ being as long or even slightly longer than the joint is wide, 2 or 3 spines are moreover doublé. The dactyli (Fig. 9^), that resemble those of the genus Car/diua H. M.-Edw., are 0,9 mm. long, almost half as long as the propodi and 4-times as long as wide at base; they are armed on their posterior margin with 5 stout spines, including the terminal claw, that increase in length from the ist to the last. Carpus of 4th pair 1,23 mm. long, propodus 2,1 mm., the latter a little longer in proportion to the carpus than in the 3rd pair; there are 3 spines on the anterior border of the carpus but only one on the posterior near the distal extremity. Propodus 7-times as long as wide, with only 2 small spines on the proximal half of the anterior margin, but with 9 strong spines on the posterior margin, some of which are again doublé. The dactyli are 0,85 mm. long and fully resembly those of the 3vd pair, 4 spines, increasing in length, being implanted posterior to the terminal claw. Carpus of 5"1 pair 1,2 mm. long, propodus 2,32 mm. long, almost twice as long as the carpus ; there are 4 or 5 spines near the anterior border of the carpus, one at the far end of the posterior margin, with a smaller spine behind it. Propodus of a slenderer form than those of the 3rd and 4th pair, 9-times as long as wide; there are 3 small spines on the proximal half of the anterior margin, while the posterior is armed with 1 1 articulating spines of somewhat unequal length, though generally becoming longer distally, the longer of the two spines at the distal extremity measuring 0,38 mm., one and a half as long as the propodus is wide. The dactylus (Fig. 9 h) is 0,72 mm. long, a b o u t on e-t h i r d of the propodus, and almost 4-times as long as wide at base ; it is armed with 8 spines, including the terminal claw; these spines are of a less stout shape than those of the dactyli of the 3rd and 4th pair, but also increase in length from the proximal one to the terminal claw. Like the meri, also the carpi and the propodi of the three posterior legs are provided with a few feathered setae. Ova not very numerous, comparatively large, 0,65 mm. long and 0,4 — 0,48 mm. wide. The two young specimens from the Stations 33 and 65a show nothing remarkable, but the meri and carpi of the ist and 2nd pair of legs are still almost devoid of spines. General distribution: Ternate. 2. Stylodactylus Sibogae de Man. PI. V, Fig. 10 — \oc. Stylodactylus Sibogae J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden, 19 18. Deel IV, afl. 3, p. 159. Stat. 95. June 26. 5°43'.5 N., U9°4o'E. Sulu Sea. 522 m. Stony bottom. 1 female. A new species at first sight distinguished from the six other species of this genus by the lower margin of the rostrum being smooth, not denticulate. The only specimen collected measures 1 1,78 mm. from tip of rostrum to tip of telson ; measured in the middle line the cara- pace proves to be 2,16 mm. long, the rostrum 1,38 mm., the abdomen 8,24 mm.: it is probably a young female. The rostrum (Fig. ioa), that measures two-thirds the length of the carapace, runs horizontally forwards to about the middle of the 2nd joint of the antennular peduncle; the upper border, slightly convex above the orbital margin, runs downward to the acuminate tip, while the lower margin is slightly concave. In a lateral view the rostrum, not including the teeth, 39 appears 0,28 mm. high at base, just one-fifth the length. While the lower margin is smooth and o-labrous, the upper is armed with 16 teeth; the first six stand on the carapace, slightly increase in length from the ist to the 6th and are, like the 5 or 6 following, separated by very short interspaces. Excepting the five distal ones, the rostral teeth are apparently all articulated and movable; those above the orbital margin and the eyes are a little larger than the first and the last. The foremost tooth is situated at one-fifth the length of the rostrum from the tip. The carapace which is about one and a half as long as high, bears a small supraorbital spine like in Stylod. Amarynthis, an antennal and a branchiostegal spine ; the antennal spine is a little larger than the two others. The abdomen, that is 6-times as long as the rostrum and 4-times as long as the carapace, appears a little more than twice as long as carapace and rostrum taken together. The third tergum, which is 1,32 mm. long, appears distinctly bent in a lateral view and somewhat prominent posteriorly. The 5th somite, 0,8 mm. long, is as long as the 4th; the 6th, 2,04 mm. long, is 21/2-times as long as the 5th and, being 0,62 mm. high in the middle, appears a little more than 3-times as long as high. Telson 1,65 or 1,7 mm. long, a little shorter than the 6th somite and armed at either side of the acute tip with 3 spines, of which the external is 0,1 mm. long, the following 0,4 mm., the submedian 0,2 mm.; 5 pairs of dorso-lateral spinules. The outer uropods reach as far backward as the terminal spinules of the telson, the inner are a little shorter. Different from Stylod. Amarynthis, but like in the other species of the genus, the abdominal pleura are unarmed, those of the ist to 3rd are rounded, while the posterior angles of the 4th and 5th are subacute. Measured from the orbital margin the cylindrical eyestalks appear almost half as long as the carapace, while they are half as thick as long; the semiglobular, distinctly faceted corneae measure two-thirds the length of the rest of the stalk, they are of a pale grayish colour, blackish near their posterior margin, especially at the outer side and without ocellus. Antennular peduncle little shorter than the carapace, the proportion being like 7 : 9, very slender, 10 to 11-times as long as thick; the basal joint, that is strongly hollowed out above, is more than twice as long as the two following joints combined and the 2nd, that is a little longer than thick, appears about one and a half as long as the 3rd ; outer fiagellum much broader or thicker at base than the inner and tapering forward, inner fiagellum cylindrical. Stylocerite lamellate, with acute tip, shorter than the eyestalks. The antennal scale that measures five-sixths the length of the carapace and that reaches by about one-fourth its length beyond the antennular peduncle, has a narrow shape, the greatest width, proximally, being one-sixth the length ; it regularly narrows distally to the truncate tip of the lamella, which is surpassed by the slender spine, into which the concave outer margin terminates. Antennal peduncle hardly longer than the eyestalks, of a stout shape. The 2nd maxillipeds much resemble those of Stylod. Amarynthis. The 3rd joint, 0,8 mm. long and 0,22 mm. broad in the middle, is nearly 4-times as long as wide and narrows a little more towards the distal than to the proximal extremity, the outer margin bears a few setae and much longer feathered setae occur on the outer surface near the inner margin. Carpus short. The 5th joint, which is 0,54 mm. long, measures two-thirds of the 3rd and slightly widens distally, being at the distal extremity 0,21 mm. broad, as broad as the 3rd; at the far end of 40 the outer margin and elsewhere long feathered setae occur, that are curved inward. Of the two terminal joints one is 0,42 mm. long, a little shorter than the propodus and 3-times as long as broad in the middle; the other joint is little more than half as long and both are beset and frineed with long feathered setae. The external maxillipeds that project by their terminal joint beyond the antennal scale and the peraeopods of the ist and 2nd pair resemble those of Stylod. Amaryntliis, but they are not armed with small spines; like in this species the lovver border of their joints is fringed with the same long feathered hairs. The three posterior legs are more slender than those of Stylod. Amarynthis. The merus of the 3rd pair (Fig. io<5), 2,2 mm. long and 0,2 1 mm. broad, is nearly 11-times as long as broad and armed with a spine near the distal extremity of their lower margin, while nearly a dozen of simple hairs are implanted on the upper; the carpus measures one-third the length of the merus and is 4-times as long as thick at the far end ; the propodus, 1,7 mm. long and 0,175 mm- broad, is one-fourth shorter than the merus and 10-times as long as broad, 6 small spines occur on its posterior border, that increase in length from the ist to the 6,h, while there is a small spinule on the middle of the posterior margin of the carpus ; the dactylus (Fig. ioc), in Stylod. Amarynthis almost half as long as the propodus, measures in this species but one-fifth of the latter, it is 21/3-times as long as broad and armed with 3 spines posterior to the terminal claw. The legs of the 4* pair resemble those of the 3rd, those of the 5th pair, finally, are a little slenderer, but show for the rest also the same characters, even as regards the armature of the dactyli. The exopodite of the 2nd pleopod is as long as the stalk or protopod, the endopodite but little shorter, the slender stylamblys, finally, provided with distinct cincinnuli, is a little longer than one-third of the endopodite. Superfamily HOPLOPHOROIDA. Family Hoplüphoridae. The family Hoplophoridae contains the seven genera Hoplophorus H. M.-Edw., Systellaspis Bate, Acanthephyra A. M.-Edw., Ephyrina S. I. Smith, Notostomus A. M.-Edw., Hymenodora G. O. Sars and Gonatonotus A. M.-Edw. As regards the genus Meningodora S. I. Smith, established in 18S2 for a species, taken at 1632 fathoms off the east coast of the United States and which in 1S88 was united by Spence Bate with the genus Hymenodora G. O. Sars, I would remark that in my opinion it must be identified, not with the genus Hymenodora, but with the genus Acanthephyra A. M.-Edw. The oral appendages, indeed, are just like in Acanthephyra, a fact already observed by S. I. Smith himself, for in his detailed description of Meningodora mol/is (in: Buil. Mus. Comparat. Zoology, Vol. X, N° 1, Cambridge 1882, p. 74) this author says: the oral appendages are all very nearly as in Miersia Agassizii (i. e. in Acanthephyra purpurea), the differences being no greater in fact than might be expected between species belonging to the same genus. The endopod of the first maxilliped is composed of three segments and the two inner distal lobes of the second maxilla are narrow and project considerably beyond the basal lobe (S. I. Smith, 1. c, Plate XII, Figs. 7 and. 8), in Hymenodora G. O. Sars, on the contrary, the endopod of the first maxilliped is biarticulate and the two inner distal lobes of the second maxilla are broad and do not project beyond the basal lobe. It was the general appearance of Meningodora mollis, so conspicuously different from that of the species of Acanthephyra, known at that time, by the very thin and membranaceous integument and the very short rostrum, which no doubt has led to the establishment of this new genus. Nowadays, however, already three species of Acanthephyra are known in which the integument is similarly soft, thin and membranaceous and in which the rostrum is short, viz. Acanth. brevi- rostris S. I. Smith, Acanth. rostrata (Bate) and the interesting Acanth. Sibogae: the name of Meningodora may therefore be retained for that small section of Acanthephyra, in which those characters occur. In the Table of Species of Acanthephyra (Stanley Kemp, in: "Fisheries, Ireland, Sci. Invest., 1905, I., [1906], p. 23") Acanth. mol lis must be classed in the third Section C, being related to Acanth. Balei. Eight species of Hoplophoridae have been obtained by this expedition, they belong to SIBOGA-F.XrEDITIE XXXIXa3. 6 42 the genera Hoplophorus, Systellaspis and Acanthephyra : besides a new variety of Acantli. media Bate, a new species of this genus was discovered, presenting the same soft and mem- branaceous integument as Acanth. brevirostris S. I. Smith etc. and which therefore must be included in the now proposed section or subgenus Meningodora. Very interesting is also the only specimen of Systellaspis debilis (A. M.-Edw.), taken in the Halmaheira Sea, that proved to differ rather distinctly from the typical atlantic species and therefore has also been described as a new variety. As far as we know at present, the Indian Archipelago, including the Philippine Islands, is inhabited by one species of HoplopJiorus, by one of Systellaspis, by ten species and two varieties of Acanthephyra, by three species of Notostomus and by one of Hymenodora, while species of Ephyrina and Gonatonotus have not yet been observed in these seas. LIST OF ALL THE SPECIES OF HOPLOPHORIDAE, KNOWN AT PRESENT. I. Genus Hoplophorus H. M.-Edw. 1837. SPECIES HABITAT DEPTH IN FATHOMS REMARKS foliaceus Rathb. 1906 . . . Hawaiian Islands 337 to 442 This species is perhaps Off the Farquhar Islands 500 to 0 identical with Hopt. spinicauda A. M.-Edw. gracilirostris A. M.-Edw. 1881 St. Domingo 11S Off Morro Light 250 — 400 Off Dominica 10S — 250 Off St. Vincent 424 Off St. Vincent 464 Off Grenada 159 Off Bequia 458 Arabian Sea 406 Off the S. W. coast of India 237 Off Desroches Atoll 250 to 0 Bay of Bengal 145 to 1439 Andaman Sea 185 to 419 Hawaiian Islands 222 to 498 Grimaldii Cout. 1905 . . . West of Madeira 0—1093 North of Tristan da Cunha 5- 4 longirostris Bate 1888. . . Fiji Islands 610 Perhaps identical with Hopt. gracilirostris A. M.-Edw. spinicauda A. M.-Edw. 1883 347 typus H. M.-Edw. 1837 . . North of New Guinea 11 00 With this species Nopt. Philippine Islands 700, 825 brevirostris Bate 1888 East of Saleyer 633 from off Tablas Island Flores Sea 874 is certainly identical. Bali Sea 294> 579 Ti mor Sea 230 43 II. Genus Systellaspis Bate 1888. SPECIES HABITAT DEPTH IN FATHOMS REMARKS affinis (Faxon) 1S96 . . . cristata (Faxon) 1893 . . debilis (A. M.-Edw.) 1881 debilis (A. M.-Edw.) var. indica de Man 1916. . . echinurus Cout. 191 1 . . . lanceocaudata Bate 1888 . Oft* Grenada Gulf of Panama Arabian Sea South of Iceland West Atlantic between New Vork- and the West Indies Fiom South of Iceland to the Bay of Biscay South of the Azores West of the Cape Verde Islands South Atlantic (35°39'S., 8° ió' W.) Hawaiian Islands Halmaheira Sea Off the coast of Portugal Oft" Japan 159 H/L 1772 890 From 411 to 2512 On a few oc- casions adult specimens and larvae have been caught quite near the surface 436 With this species Acanth. gracilis (S. I. Smith) 1882 is identical, while Systell. Bouvieri Cout. 1905 proved to be a young stage of Systell. debilis. 345 III. Genus Acanthephyra A. M.-Edw. 1881. acutifrons Bate 1888. approxima Bate 1888 . . approxima Faxon 1895 . armata A. M.-Edw. 1881 armata A. M.-Edw. var. fim- briata W.-Mas. 1894. . Aru Islands Sarmiento Channel Patagonia 400 Gulf of Panama 458 — 1 168 Galapagos Islands 384 Off Santa Lucia, West Indies 422 Oft" Frederikstaed, Santa Cruz, West 450 Indies Off Nevis, West Ir idies • 356 Bali Sea 694 Strait of Makassar 655 Off Banda Island 200 East of Ceram 567 West of Salawatti 798 Kei-islands 560 Arabian Sea 406 Bay of Bengal 475 and 594-225 Andaman Sea 405 800 The first of the three specimens described by Bate is considered to be the type, while Stanley Kemp has pointed out in 1906 that two of the thrce belong probably to Acanth. cnrtirostris W.-Mas. 44 SPECIES HABITAT DEl'TH IN FATHOMS REMARKS Batei Faxon 1895 Braueri Balss 19 14 - . . ■ brevirostris S. I. Smith 1885 carinata Bate 1888 . . . cncullata Faxon 1893 . . curtirostris W.-Mas. 1891 eximea S. I. Smith 1884 exitnea S. I. Smith var. brachytelsonis Bate 1888. 6 Kempii Bal Is 19 14 South-west of Sierra Leone Equatorial Atlantic South of Iceland Gulf of Guinea Off the East coast of the United States Off the coast of Portugal {duplex Bate, teste CoUTlKRE 191 1) Equatorial Atlantic Off Marion Island [duplex Bate) North coast of Ecuador Sarmiento Channel, Patagonia Gulf of Panama Arabian Sea Bay of Bengal Andaman Sea Flores Sea Manipa Strait Entrance of Gulf of Boni South of Buton Passage From off San Diego, Calif. to off the Gulf of Panama Off the east coast of the United States South of Pernambuco {Edwardsii Bate) Arabian Sea Bay of Bengal Andaman Sea Off Banda Island [angusta Bate) Hawaiian Islands Cape Natal, South Africa Arabian Sea Bay of Bengal Andaman Sea Siberut Island North of Sumbawa Timor Sea Ceram Sea Off the east coast of Ceram Off Banda Island South of the Philippine Islands Off the Kermadec Islands Japan North of the Falkland Islands East of Ceylon 1500 1640 400 0—2185 1395—2949 1640 1600 1740 400 1772 • 937—1043 364—913 922 1 100 From 840 to surface 1062 I350 458—2232 933 770 457 — 865 561, 753 405, 498 200 339—1059 440 738 — 1000 753 and 800-637 490— 68 3 0—955 435 452 456, 1040 310 200 '500 520 — 630 235» 345- 775 2040 0—1366 W'ith this species Hyvie- nodora duplex Bate 1888 is regarded to be identical by STANLEY W. Kemp 1906, while the validity of Bate's species is still main- tained by COUTIÈRE 191 1. With this species Acantli. angusta Bate 1888 and Acanth. Edwardsii Bate 1888 are identical. 45 SPECIES HABITAT DEPTH IN' FATHOMS REMA.RKS x)Kingsleyi Bate 1888. . . South-west of Sierra Leone 25OO Off Tablas Island, Philippines 700 media Bate var. obliquiros- tris de Man 19 16 . . . . Halmaheira Sea IOI3 microphthalma S. I. Smith 1885 Off the east coast of the United States Off the coast of Portugal [longidens Bate) 2574, 2620 With this species Acanth. longidens Bate 1888 is Bay of Bengal Off the Philippine Islands [longidens 1748 2I50 regarded as identical ; its validity is, however, Bate) still maintained by mollis (S. I. Smith) 18S2 . South Pacific [longidens Bate) Off the east coast of the United States 2375 IIO6, I632 COUTIÈRE 191 1. For this species confer Off Pernambuco 675 p. 41. Off Portugal pulchra A. M.-Edw. 1890. Mediterranean 69O I5SO pur pur ca A. M.-Edw. 1881 . Mediterranean From 105 to With this species Acantli. Adriatic 2949. It hasonce Haeckelü[v. Mart.) 1 868, Northern Atlantic, both on the east been taken, off Acanth. Agasshi (S. I. and on the west side, from Davis the east coast of Smith) 1882, Acanth. Strait and Iceland to south of the the United States, sica Bate 1888, Acanth. Cape Verde Islands, though not at the surface. rectirostris Riggio 1900 yet observed in the West Indies. and Acanth. Ba'.'ei Steb- Equatorial and southern Atlantic North of the Falkland Islands bing 1905 are identical, while Acanth. parva Cape of Good Hope Cout. 1905 has proved Indian Ocean, south of the Equator South of Australia Off New Zealand Off the Kermadec Islands to be a very young form of Acanth. pur- purea. Between Australia and the Solomon Islands Indian Archipelago South of Japan Gulf of Panama Coast of Ecuador purpurea A. M.-Edw. var. acanthitelsonis Bate 1888. South-west of Sierra Leone 1500, 1850 Equatorial Atlantic South-west of the Azores 1640 0—1093 rostrata (Bate) 1888 .... Near Torres Strait 0 — 1 640 1400 Philippine Islands North Pacific 1050 2775 sanguinea W.-Mas. 1892. . Arabian Sea 295—1091 Bay of Bengal Andaman Sea 1748 194 — 640 00 I) In the Table of Species of Acanthephyra, published by Stanley Kemp in: "Fisheries, Ireland. Sci. Invest., 1905, I., [l9o6\ p. 24", Acanth. Kingsleyi has erroneously been placed in Section C, in which the rostrum is unarmed below; this remark is also applicable to a variety of Acanth. brevirostris S. I. Smith, recorded by Faxon from the north coast of Ecuador. 46 SPECIES HABITAT DEPTH IN FATHOMS REMAKKS Sibogae de Man 1916 . . . Kntrancc of Gulf of Boni tenuipes (Bate) 1888 .... Coral Sea Valdiviae Balss 19 14. . . . Southern Indian Ocean 1062 1400 o — 1 130 IV. Genus Ephyrina S. I. Smith 1885. Benedicti S. I. Smith 1885 Off the east coast of the United States South-west of Ireland Off Portugal South of Japan Arabian Sea Bay of Bengal Gulf of Gascony South-west of Ireland Off Portugal Hoskynii W.-Mas. 1891 959 o — 700 2425 487, 740, 890 800 — 637 656 695 — 720 V. Genus NotOStomus A. M.-Edw. 188 1. atlanticus Lenz 19 14. . brevirostris Bate 1888. elegans A. M.-Edw. 1881 . fragilis Eaxon 1893. gibbosus A. M.-Edw. 1881 japonicus Bate 1888 . longirostris Bate 1888 Murrayi Bate 1888 . patentissimus Bate 1888 perlatus Bate 1888. . . robustus S. I. Smith 1884. vescus S. I. Smith 1886. . Westergreni Faxon 1893 . West of the Cape Verde Islands Off Pernambuco Gulf of Mexico Off Portugal Off Cocos Island Grenada, Antilles South of Japan Off Banda Island Near Tristan da Cunha South of the Philippine Islands Near the Philippine Islands North of Chagos Archipelago 1640 675 955 770 626 565 1425 1900 2150 2150 1 200 — o According to Stanley KEMP this species is probably identical with Not. perlatus Bate 1888. Off the east coast of the United States 1309, 1555, 1582 Off the east coast of the United States Coast of Ecuador Cape of Good Hope 2949 1740 800 VI. Genus Hymenodora G. O. Sars 1876. frontalis Rathb. 1902 . . glacialis (Buchholz) 1874 From Bering Sea and Kamchatka to off Monterey Bay, Calif. Between Spitzbergen and Greenland Faröe Channel West of Ireland Bay of Biscay South-west of Liberia Off the east coast of the United States Off the west coast of America from the Bering Sea to Ecuador 322 to 1771 From 1 37 to 2949. Like Acanth. purpurea this species hasonce been taken at the surface. 47 SPECIES HABITAT DEPTII IN FATHOM* VII. Genus Gonatonotus A. M.-Edw. 1SS1. crassus A. M.-Edw. i SS t . Grenada, Antilies 262 REMARKS glauca Bate 1888 South of Australia 2150 South of the Philippines 2550 mollicutis Bate 1S88 .... 2°25'N., 200l'\V. 2500 Near the Canary Islands 1675 Near Tristan da Cunha 1900 62°26' S., 950 44' E. 1975 53°55'S., io8°35'E. 1950 42°32'S., 56029' \V. 2040 Hoplophorus H. M.-Edw. 1881. Oplophorus H. Milne-Edwards, Hist. Nat. Crust. II, 1837, p. 423. Oplophorus C. Spence Bate, Challenger Crustacea Macrura, 1888, p. 760. Hoplophorus A. Alcock, Catal. Indian Deep-Sea Macrura, 1901, p. 72. The genus Hoplophorus H. M.-Edw., characterized by the strongly serrated outer edge of the antennal scale and by the foliaceous exopodites, with which the maxillipeds and the anterior or all the thoracic legs are provided, is represented by 5 or 6 species, that occur in the tropical and subtropical seas of both hemispheres. Hopl. typus H. M.-Edw., the first described species, hitherto only known from the Admiralty and Philippine Islands, was taken by the "Siboga" in various parts of the Indian Archipelago, East of the Island of Saleyer, in the Flores Sea, the Bali Sea and off the south coast of Timor. Hopl. gracilirostris A. M.-Edw., a beautiful species of a bright carmine pink colour, first discovered by the U. S. Coast Survey Steamer "Blake" off the island of St. Domingo and afterwards captured by the same expedition at a few other West Indian localities, occurs also in the Indian Ocean, the Arabian Sea, the Bay of Bengal and the Andaman Sea, and has even been observed near the Hawaiian Islands. Ho/>l. longirostris Bate, probably only a variety of Hopl. gracilirostris, was found by the "Challenger" off Kandavu, Fiji Islands. Hopl. foliaceus M. J. Rathbun, the third or fourth indopacific represen- tative of this genus, is recorded both from the Hawaiian Islands in the Pacific and from the Farquhar Islands in the Indian Ocean. Still two other species are found in the Atlantic, viz. Hopl. Grimaldii Cout., a form closely related to Hopl. gracilirostris, observed west of Madeira and north of Tristan da Cunha, and finally Hopl. spinicauda A. M.-Edw., discovered by the "Travailleur", a species apparently closely allied to Hopl. foliaceus, but which is only known by a figure in the "Recueil de Figures de Crustacés nouveaux ou peu connus", published by A. Milne-Edwards in 1883. The species of this genus are generally found in deep water, the maximum depth being 1439 fathoms, from which Hopl. gracilirostris was recorded in the Bay of Bengal; this form, however, occurs here also in 145 fathoms and is recorded from off the island of St. Domingo as living in 118 fathoms. I wish, however, to call attention to the remarkable observation, 48 made by the Germah Southpolar Expedition, October 3i,h 1901, when numérous specimens of Hopl. Grimaldii Cout. were caught north of Tristan da Cunha, in the night, in only 5,4fathoms! Kty t o the species of the genus Hoplophorus H . M.-Edw. ax Third, fourth and fifth abdominal segments terminating in a spine. bl Inner margin of antennal scale simple. A tooth at the postero- lateral angle of the carapace. c\ Rostrum about as long as the antennal scale, often a little shorter; spine of 3rd tergum, in adult specimens, hardly longer than that of 5th; lower angle of the pleuron of the ist abdominal somite not produced to form a tooth . . typus H. M.-Edw. c„ Rostrum as long as up to i^-times the rest of the carapace; lower angle of the pleuron of the ist abdominal somite, in the male, usually produced to form a tooth. dx Spines of 3rd and 5th terga subequal longirostris Bate. (C. SrENCE Bate, Challenger Crustacea Macrura, 188S, p. 760, Plate CXXVII, fig. 2). d„ Spine of 3rd abdominal tergum, in adult specimens, very much longer than that of 5* grdcilirostris A. M.-Edw. (A. MlLNE-EDWARDS, in: Annal. Sc. Nat., Zool. 188 1, p. 6 and in: Recueil de Figures de Crustacés nouveaux ou peu connus, 1883, PI. 29). b„ Inner margin of antennal scale with a barbed hook anteriorly. Rostrum i3/4-times as long as the rest of the carapace. No tooth at the postero-lateral angle of the carapace. Spine of 3rd tergum very much longer than those of 4th and 5th . . Grimaldii Cout. (H. COUTIÈRE, in: Bulletin Mus. Océanogr. de Monaco, Nn 48, 1905, p. 1). a2 Second, third and fourth abdominal somites terminating in a spine. No tooth at the postero-lateral angle of the carapace .... spinicauda A. M.-Edw. (A. MlLNE-EDWARDS, Recueil de Figures de Crustacés nouveaux ou peu connus, 1883, PI. 29). foliaceus M. J. Rathbun. {M. J. RATHBUN, in: U. S. Fish Commission Bulletin for 1903, Part. III, Wash. 1906, p. 922, PI. XX, fig. 8). 1. Hoplophorus typus H. M.-Edw. Oplöphorus typus H. Milne-Edwards, Hist. Nat. Crust. II, 1S37, p. 424, PI. 25 bis, fig. 6, 7. Oplopliorus typus C. Spence Bate, Challenger Crust. Macrura, 1888, p. 762, PI. CXXVII, fig. 1 — is. ? Oplopliorus brevirostris C. Spence Bate, 1. c, p. 766, PI. CXXVII, fig. 3. Stat. 17. March 17. 7°28'.5S., II5°28'E. Bali Sea. 1060 m. Bottom fine grey mud. 1 male. Stat. 46». April 7. 8° o'. 5 S., u8°34'.7E. Flores Sea. 1600 m. Bottom mud. 2 females, one of which is ova-bearing. Stat. 211. September 25. 5°4o'.7 S., I20°45'.5 E. East of Saleyer. 115S m. Coarse grey mud, superficial layer more liquid and brown. 1 female. 49 Stat. 291. January 20, 1900. g° IC/.3 S., I25°55'.i E. Timor Sea. 421 m. Bottom vcry fine, grey mud. 1 young female. Stat. 316. February 19, 1900. 7°I9'.4S., n6°49'.5E. Bali Sea. 538 m. Bottom fine, dark brown sandy mud. 1 young male. The largest specimen, the female with eggs from Stat. 46*, measures 66 mm. from tip of rostrum to tip of telson, the carapace being 28 mm. long, the rostrum included, and 15 mm. without it. It fully agrees with Figure 1 of the "Challenger Macrura", but the rostrum is distinctly somewhat (3 mm.) shorter than the scaphocerites. The upper margin is 6-dentate, the ist tooth, situated just midway between the orbital margin and the distal end of ist antennular article, is microscopical, only visible by means of a strong magnifying glass, while the foremost tooth is placed midway between the 2na and the apex of the rostrum; the lower border is armed along the middle third with 5 teeth, of which the ist and the 5th are much smaller than the rest, that are equal. In the other female from this Station the rostrum appears just as long as in Bate's figure 1 and is f-dentate. In the young female from Stat. 211 which is 43 mm. long, the rostrum just reaches beyond the scaphocerites and is V'-dentate ; the two first teeth of the upper border are microscopical and the foremost tooth stands at one-sixth the length of the rostrum from the tip. Of the female long about 49 mm. from Stat. 291 the rostrum is as long as in the female from Stat. 211 and also armed with 10 teeth above, but the three first and the foremost one are microscopical; the lower margin, however, bears only 5 teeth. The rostrum of the male from Stat. 1 7 is broken off, this specimen, however, measured probably about 50 mm.; the other male from the Bali Sea has nearly the same size, the rostrum, as long as in Bate's figure 1, is f-dentate, but all the teeth of the upper border are well-developed. The length of the rostrum proves thus to be somewhat variable. In the largest female from Stat. 46a the dorsal median carina appears rather sharp along the whole length of the gastric region, but in the other younger specimens it becomes gradually obtuse posteriorly near the cardiac region ; a little posterior to the orbital margin the dorsal carina bears a small circular impressed point and appears here a little higher. On the cardiac region the carina is rather obtuse, somewhat widened in the middle and in the largest specimen, the ova-bearing female from Stat. 46% even flattened. On either side this widened part of the carina carries 2 or 3 small tubercles and a few small tubercles exist also, on either side of the carina, on the dorsal surface of the cardiac region, which is separated from the gastric region by a shallow transverse groove. The spine at the postero-lateral angle of the carapace is not straight, as figured by Bate, but slightly curved, directed backwards and outwards; it appears also comparatively a little shorter than in Figure 1 of the „Chal- lenger Macrura". Hoplophorus typus is pretty well characterized by the form and the relative length of the three dorsal spines of the abdomen, that are accurately figured in Bate's figure 1. The spine of the 3rd tergum is constantly longer than that of the 5lh, rather little longer in adult, but much longer in younger individuals, also less slender, somewhat thicker or higher at the base; the spine of the 4th tergum is always distinctly shorter than the two others and more or less regularly curved. The two first somites and the triangular anterior part of the SIBOGA-EXPEDIT1E XXXIX ,!■'. 7 5o dorsal carina of the 3ld somite are dorsally flattened. The lower margin of the ist abdominal jileuron is truncate, straight and makes an obtuse angle with the anterior margin, which is rounded anteriorly, but which in the two females from Stat. 46* appears very slightly concave or excised near the lower angle, exactly as in Bate's figure i ; in the two young females from the Stations 211 and 291 the anterior margin of the ist pleuron is little more emarginate, bnt in the two male specimens the excision is deeper and more pronounced, though neither in the male nor in the female specimens the lower angle is produced like a tooth, as is usually the case in Hopt '. gracilirostris A. M.-Edw. Though the two male specimens are perhaps not yet full-grown, it seems, however, quite probable that in Hopl. typus the lower angle is never dentiform, a character by which this species should differ from Hopl. gracilirostris and Hopl. longirostris. In the largest specimen, the ova-bearing female long 66 mm., the external maxillipeds project by half their terminal joint beyond the antennal peduncle, the legs of the ist pair reach almost as far forward as that peduncle, those of the 2nd and 3rd are hardly shorter and the legs of the last pair extend as far as the antero-lateral angle of the carapace. There is a small spine near the distal extremity of the lower margin of the merus of 3rd legs. Ova large, 3 mm. long and 2,5 mm. broad. Hopl. brevirostris Bate is no doubt identical with this species, for it only differs by the shorter rostrum, the rostrum, however, is proved by the preceding to be variable. Hopl. gracili- rostris A. M.-Edw. differs from Hopl. typus H. M.-Edw. by the longer rostrum, by the spine of the 3rd abdominal tergum being very much longer than those of the 4th and 5th and by the anterior border of the pleuron of the ist abdominal somite being deeply excised in the male with the lower or posterior angle of the notch pronounced and usually produced (A. Alcock, 1. c. 1901, p. 74). Hopl. longirostris Bate seems to differ from Hopl. gracilirostris only by the three spines of the abdomen being of equal length and should perhaps be regarded as a variety. General distribution: New Guinea (H. Milne-Edwards) ; North of New Guinea (Spence Bate) ; Philippine Islands (Spence Bate). Systellaspis Bate. The genus Systellaspis Bate, the validity of which has been clearly demonstrated by Professor Coutière, includes at present 5 species and 1 variety. Systell. debilis (A. M.-Edw.) is distributed throughout the Atlantic, both on the east and on the west side, from South of Iceland to near Tristan da Cunha, but a solitary specimen has also been taken in the vicinity of Kauai Island, one of the Hawaiian Islands. Another specimen was obtained by the "Siboga" in the Halmaheira Sea; this specimen, however, presents some differences from the typical species, so that it is described as a new variety. In view of this fact it is to be regretted that not any observation concerning the Hawaiian specimen has been published, because its characters have perhaps been the same as those of the female from the Halmaheira Sea. Systell. laneco- caudata Bate, the type species of the genus, was obtained by the "Challenger" off Japan, but only one specimen, a female, was taken. Still a third species is known from the Indopacific, 5i namely Systell. cristata (Faxon), a single specimen of which was dredged in the Arabian Sea, while this form was for the first time captured in the Gulf of Panama. Systell. affinis (Faxon) is only known from off Grenada, one of the Antilles, Systell. echinurus Cout.. finally, only from off the coast of Portugal. As reo-ards the variability of the vertical range the genus Systellaspis resembles the o-enus Acanthephyra. While Systell. affinis Faxon, Systell. lanceocandata Bate and the variety indica of Systell. debilis (A. M.-Edw.) were obtained at less than 500 fathoms, Systell. cristata (Faxon) was found at 890 fathoms in the Arabian Sea, but in the Gulf of Panama even at 1471 and 1772 fathoms. Systell. debilis (A. M.-Edw.) has the same vertical range as Acanth. purpurea and on a few occasions adults and larvae have been captured quite near the surface. The depth at which Systell. echinurus Cout. occurs, has not been recorded. 1. Systellaspis debilis (A. M.-Edw.), var. indica de Man. PI. VI, Fig. 11 — 1 1 ƒ. Systellaspis debilis (A. M.-Edw.), var. indica J. G. de Man, in : Zoolog. Mededeelingen, uit- gegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel II, Afl. 3 en 4, 1916, p. 151. Acanthephxra debilis A. Milne-Edwards, in: Annal. Sc. Natur. (6. Sér.), Vol. XI, 1881, p. 13. Acanthephyra debilis Stanley W. Kemp, Fisheries, Ireland, Sci. Invest, 1905, I., [1906], p. 16, PI. II, Fig. 4—7 and 1908, I. [1910], p. 59, PI. VI, figs. 1 — 15 (Synonymy). Acanthephyra debilis M. J. Rathbun, in: U.S. Fish Commission Bulletin for 1903, Part III, Wash. 1906, p. 922. Acanthephyra debilis H. Lenz and K. Strunck, Deutsche Südpolar-Expedition 1901 — 1903, T. XV, Zoölogie VII, Berlin 19 14, p. 327. Stat. 161. August 17. i° 10'. 5 S., I30°9'E. Halmaheira Sea. 798 m. Bottom muddy sand. 1 egg-bearing female. Only one other specimen of this remarkable species which is distributed throughout the Atlantic, has hitherto been observed in the Indopacific, namely a specimen which was taken near Kauai Island, one of the Hawaiian Islands, at a depth of 478 to 453 fathoms (M. J. Rathbün, 1. c): unfortunately no remarks about it are given, so that it remains uncertain whether that specimen has shown the same discrepancies from the typical atlantic species as our female from Stat. 161, which therefore is considered as a variety indica. The well-preserved female, obtained by the "Siboga", measures 94 mm. from apex of rostrum to end of telson and in most characters agrees with the detailed and excellent descriptions and figures published by Stanley Kemp. The rostrum, 24,5 mm. long, one and a half as long as the carapace (15,75 mm.), is strongly curved upwards, much more than in the atlantic species according to the figures in the "Recueil" of 1883 and in Stanley Kemp's papers, so that the vertical distance between the apex of the rostrum and the upper margin of the cephalothorax measures two-thirds the height of the latter; the upper border of the rostrum appears therefore obviously concave, the lower obviously convex. The basal crest is armed with 4 teeth, the first three increase in size, while the 4th is as large as the 3rd, which is placed above the orbital margin ; the rostrum proper is armed above with 9 evenly-spaced teeth of equal size, that are as large as the 2nd tooth of the basal crest. The ist of these nine teeth is almost one and a half as far distant from the 4th tooth of the basal crest as the 4th from the 3rd and the anterior tooth of the upper margin is one and a half as far distant from the penultimate as from the apex of the rostrum. The lower border is armed with 10 teeth, of which those on the middle are more closely set together than the 2 or 3 fïrst and the 2 or 3 last ones; the ist tooth stands just before the 2nd of the upper margin, the 7th tooth is paired with the antepenultimate, while the foremost is situated midway between the apex of the rostrum and the anterior tooth of the upper margin. The carina of the 3ld abdominal somite does not commence at the anterior margin, but a Uttle — about 1 mm. — behind it and is at first rather low, though gradually rising to a more compressed carina; the spine of the 3ld tergum measures one-third the length of the 4"1 somite. The two following somites are dorsally obtuse, the spine of the 4th tergum is much smaller than that of the 3rd and measures only one-fifth of it, the spine of the 5th tergum, finally, is very small, only half as long as that of the 4lh ; the fine notch on the 4th tergum is situated at the posterior fifth. The 6th somite that is unarmed posteriorly, is 10 mm. long, a little more than one and a half as long as the 5"1, that measures 6 mm. The dorsal portions of the postero-lateral margins of the 4th and 5th somite are spinulose, but the spinules are a little smaller than in Kemp's figure 1 on Plate VI of his work of 1910; the 4"1 somite has on the left side 6, on the right 7 spinules, the 5th on the left side 4, on the right 5 spinules and on each side the lowermost spinule or the lovvermost but one is a little larger than the rest. The telson, which is slightly grooved dorsally, except the anterior fourth, is 13,25 mm. long, one-third longer than the 6th somite, and reaches a little, viz. 0,5 mm., beyond the exopodites of the eau dal fan, when stretched backward. The terminal cluster of spines agrees with Kemp's description of 1910 and there are four pairs on the lateral sides of the telson, the anterior or 4th pair just before the middle, the 3rd pair as far distant from the 4111 as from the ist, the 2nd just midway between the ist and the 3"1. According to Kemp's description of 19 10 the antennular peduncle should be very short and only reach to about one-third the length of the antennal scale, in the female from the Halmaheira Sea, however, it extends al most to the middle, viz. to 10/23 of the length of the scale. The antennal scale, 11,5 mm. long, proves to measure fi ve-se venths the length of the carapace (15,75 mm.), measured between the orbital and the posterior margin, not five- sixths as in the atlantic species. The legs of the 3rd pair are the longest of all and al most reach to the end of the antennal scales, being only 1 mm. shorter ; the propodus (5 mm.) is not "at least three times" (Kemp, 1. c. 19 10), but little more than twice as long as the carpus (2,3 mm.) - - in the 4thl pair these numbers are 5 mm. and 2 mm. - and of both legs the propodus slightly tapers distally in a lateral view. In both the 3rd and the 4* pair the dactylus measures about four- fifths, not "about two-thirds" the length of the propodus. The legs of the 4* pair reach to the distal third of the antennal scales, those of the 5* pair, finally, are the shortest of all, projecting only by half their dactyli beyond the distal extremity of the carpus of the 4th pair. General distribution: As already indicated by Mr. Kemp, four isolated specimens, one male, two females, one of which with eggs, and still a fourth specimen have been taken 53 between New York. and the West Indies (A. Milne-Edwards, S. I. Smith and W. Faxon). A single specimen has been observed South of Iceland in Lat. Ö2°47'N. (Hansen). In the X. E. Atlantic numerous specimens have been obtained by the Danish fishery steamer Thor and by the s. s. Helo-a in the Atlantic trough over an area ranging from the Faröe Islands to the Bay of Bïscay (Hansen, Kemp). Three female specimens, one of which was immature (Systcllaspis Bouvieri Cout.), were captured near the Azores (Coutiére), while it is recorded by Hans] x from the mouth of the English Channel and from off the Brittany coast. This species has been taken by the German Southpolar-expedition 1901 — 1903 west of the Cape Verde Islands and at Lat. 28°42'N., Long. 34°33'VV., but also in the South Atlantic at Lat. 350 39' S., Long. 8° 16'W.. (Lenz and Strunck). As already mentioned, a solitary specimen is known from the Pacific, namely from the vicinity of Kauai Island, one of the Hawaiian Islands (Rathbun). Acanthephyra A. M.-Edw. The genus Acanthephyra, established by A. Milne-Edwards in 1881, is nowadays represented by 2 1 species and 4 varieties, the greater part of which have been observed either in the Indopacific or in the Atlantic or on the west coast of America, but some species of this deep-water genus are more widely distributed, occurring both in the Indopacific and the Atlantic or both in the Indopacific and off the west coast of America, or on both sides of the new world, Acanth. purpurea A. M.-Edw., finally, shows an almost world-wide range. This nice species, easily recognizable by the long slender rostrum, armed dorsally throughout its whole length, straight or slightly upturned, and by some other characters, occurs, indeed, not only in the Mediterranean and in the whole Atlantic from Davis Strait and Iceland to the Falkland Islands, but has also been taken in the Indian Ocean south of the Equator, the Indian Archipelago, south of Australia, off Japan and even in the Gulf of Panama and on the coast of Ecuador; as far as I am aware, it has, however, not yet been captured in the West Indies, in the Red Sea and in the Indian Ocean north of the Equator, being represented in the Arabian Sea, the Bay of Bengal and the Andaman Sea by the closely allied Acanth. sanguinea W.-Mas. The first described species, Acanth. armata A. M.-Edw., known from the West Indies, was obtained by the "Siboga" at five different Stations, far distant from one another, of the Indian Archipelago, though it was already recorded from off the island of Banda by the "Challenger". A similar distribution shows Acanth. eximca S. I. Smith, which is moreover known from south of Pernambuco and from the Hawaiian Islands, its variety brachytelsonis Bate is distributed throughout the Indopacific from the Arabian Sea to the Kermadec Islands and Japan, but is also recorded from north of the Falkland Islands. The third and last species, known both from the Indopacific and the Atlantic, is Acanth. microph- tliahna S. I. Smith. Acanth. curtirostris W.-Mas. is the only species that occurs as well in the Indopacific as on the west coast of America, while Acanth. (Meningodora) brevirostris S. I. Smith is the only form found both on the east and on the west side of the New World, though the solitary specimen recorded from the west side, a male taken off the north coast of ^ 4*> ■ 54 Ecuador, did not fully agree with the typical species from the east side, as Eaxon has pointed out. Acanth. pulchra A. M.-Edw. occurs in the Mediterranean, but was not yet observed outside of it. Acanth. (Meningodora) mollis (S. I. Smith), Acanth. Batei Faxon, Acanth. Braueri Balss and Acanth. Kingsleyi Bate are four species, which hitherto have only been observed in the Atlantic: the first is found off the east coast of the United States, off the coast of Portugal and off Pernambuco, while the three others occur in the Gulf of Guinea, though Acanth. Batei has also been taken south of Iceland. The variety acantliitelsonis Bate of Acanth. purpurea A. M.-Edw. is also only known from the tropical part of the Atlantic. Two species, Acanth. carinata Bate and Acanth. approxima Bate occur in Sarmiento Channel on the west coast of Patagonia: the former has not yet been found elsewhere, but Acanth. approxima occurs perhaps also in the Gulf of Panama. The third of the three species which are found on the west coast of America, but not elsewhere, is Acanth. cucullata Faxon from the Gulf of Panama. Eight species and 2 varieties are at present known to occur in the Indopacific, though not elsewhere. Acanth. acutifrons Bate has only been taken off the Aru Islands and Acanth. media Bate only near one of the Philippine Islands, but a remarkable variety obliquirostris of the last named form was discovered by the "Siboga" in the Halmaheira Sea. An interesting new species, Acanth. (Meningodora) Sibogae, has also been captured by this expedition in the entrance of the Gulf of Boni, it belongs to that small section of the genus in which the integument is soft and membranaceous and for which, p. 41, the name of Meningodora was proposed. Acanth. tenuipes (Bate) has only been recorded from the east coast of Cape York Peninsula. The Indian Ocean, north of the Equator, is inhabited by Acanth. sanguinea W.-Mas., Acanth. Kcmpii Balss and by the variety Jimbriata W.-Mas. of Acanth. armata A. M.-Edw., while the typical species occurs both in the Indian Archipelago and off the east coast of the United States; Acanth. Valdiviae Balss is only known from the southern Indian Ocean, Acanth. (Meningodora) rostrata (Bate), finally, has been recorded not only from the north Pacific and the Philippine Islands, but also from Torres Strait. From the List of localities at p. 43 — 46 we may conclude that 110 less than 10 species with 2 varieties are at present known to inhabit the Indian Archipelago, 4 species and 1 variety of which have not yet been observed elsewhere, so that just half the number of all the known species of Acanthcphyra prove to occur in this Archipelago. Four species and varieties of two other ones were obtained by the Siboga expedition, of which Acanth. curtirostris W.-Mas. was not yet known to occur in the Indian Archipelago, while Acanth. Sibogae and a variety of Acanth. media Bate proved to be new to science. Concerning the vertical range it may be allowed to refer to the List at page 43 — 46, from which it results that the depths at which the species of Acanthcphyra occur, vary rather considerably. While some, like Acanth. ar'maia A. M.-Edw. and its variety Jimbriata W.-Mas., Acanth. acutifrons Bate etc, were dredged in less than 1000 fathoms, other species as e. g. Acanth. brevirostris S. I. Smith, cucullata Faxon and microphthalma S. I. Smith were taken in considerably deeper water. The depth at which some species occur, varies also rather much. So e. g. Acanth. purpurea A. M.-Edw., an almost cosmopolitan species, which was trawled off 55 the east coast of the United States in such shallow water as 105 fathoms, but which north-west of Bermuda was taken at 2675 and off the east coast of the United States even at 2949 fathoms, this depth being the greatest recorded for this genus. In most of these cases, however, as Stanley Kemp suggests in his paper of 1906, the specimens may have been caught while the trawl was being hauled to the surface. Many species occur probably in a vast region intermediate between the surface and the bottom and may sometimes approach the surface, as e. g. the already mentioned Acanth. purpurea, of which a specimen has once been captured alive at 10,45 P- m- at tne sul'face, a fact recorded by S. I. Smith (in: Annual Report of the Commissioner of Fish and Fisheries for 1S85. Wash. 1886, p. 63). Other species, however, with less developed, smaller eyes, like Acanth. microphthalma S. I. Smith and Acanth. brevi- rostris S. I. Smith, are on the contrary constantly found in much deeper water and probably never reach the surface. 1. AcanthcpJiyra eximea S. I. Smith, var. brachytelsonis Bate. Acanthephyra brachytelsonis C. Spence Bate, Challenger Crust. Macrura, 188S, p. 753, PI. CXXVI, fig- 7- Acanthephyra brachytelsonis J. Wood-Mason and A. Alcock, in: Annals Mag. Nat. Hist. Sixth Series, Vol. 9, May 1892, p. 362. Acanthephyra eximia var. brachytelsonis A. Alcock, Catal. Indian Deep-Sea Crustacea, Calcutta, 1901, p. yS. Acanthephyra brachytelsonis Th. R. R. Stebbing, South African Crustacea, Part VIII, London, 191 5, p. 97 (in: Annals South African Museum, XV, Part II, 191 5). Illustrations of the Zoology of the Investigator, PI. III, fig. 2. Stat. 45. April 6. 7°24'S., 118° 15'. 2 E. 794 m. Bottom fine grey mud, with some radiolariae and diatomes. 1 young specimen. Stat. 173. August 28. 3°27'.oS., i3i°o'.5 E. Off the east coast of Ceram. 567 m. Bottom fine, yellow grey mud. 2 young specimens. Stat. 175. August 30. 20 37'. 7 S., i30°33'.4E. Ceram Sea. 1914 m. Bottom fine, grey and green mud. 1 young male (the carapace with appendages only). Stat. 178. Sept. 2. 2°4o'S., I28°37'.5 E. Ceram Sea. 835 m. Bottom blue mud. 2 almost adult males and 3 very young specimens. Stat. 2S4. January iS, 1900. 8°43'.I S., 127° \6'.y E. Timor Sea. 82S m. Bottom grey mud. 1 fully developed specimen. The adult specimen from Stat. 284, which seems to be a female without eggs, because there is but one stylet at the base of the endopod of the 2nd pleopods, is 153 mm. long, still ii mm. longer than the largest specimen recorded (Alcock, 1. c. 1901): the rostrum, measured obliquely from the orbital margin to the apex, proves to be 24 mm. long, the carapace 39 mm., the abdomen 90 mm. The upper border of the rostrum that reaches to the terminal 5th part of the antennal scales, is at first slightly directed downward as far as the distal extremity of the antennular peduncle and from this point is obliquely directed upward. There are 5 low teeth at the proximal encl of the upper margin, of which the first two are placed on the carapace, the third above the orbital margin and two in front of it; these teeth gradually increase in length from the posterior to the anterior. Of the 3 teeth of the lower margin the ist stands immediately in front of the middle and just in front of the anterior tooth of the upper margin, 56 contiguous to the ist tooth is the 2nd that is slighriy largjer, the 3rd tooth, finally, which is very small and the smallest of all, is placed midway between the 2nd and the apex. The black ocellus is united at the inner side with the cornea, about as in Acanth. angusta (C. Spence Bate, 1. c. PI. CXXIV, fig. 6a) and there is a low rounded ocular papilla on the inner side of the stalk close to the cornea. Telson almost as long as the outer uropods, with 5 movable minute spinules at either side along the posterior half. The rostrum of the two males from Stat. 178 that are 120 to 125 mm. long, reaches as far forward as the antennal scales and resembles that of the described specimen, but the distal half ascends less strongly, so that the apex is situated in a line with the highest parts of the carapace. In one male of the 6 teeth on the upper border the 3rd is situated above the orbital margin, the three first teeth are equal and the following gradually increase in length ; the ist tooth of the lower margin is situated immediately behind the middle, just in front of the anterior tooth of the upper border, the 2nd is contiguous to it, while the apex of the 3rd tooth is 2Yo-times as far distant from the exlremity of the rostrum as from the apex of the 2nd tooth. In the other male the two first teeth are the shortest of the six, the 3"1 is placed above the orbital margin, while the 5lh is the longest of all; of the 3 teeth of the lower margin the first two are contiguous, situated immediately in front of the 6th tooth of the upper border, the 2nd is larger than the i5t, the very small third tooth, finally, is placed more forward than in the other male, though still a little farther distant from the extremity of the rostrum than from the 2nd tooth. Telson, inclusive of the spines at the tip, as long as the outer uropod, 4 minute spinules at either side along the two posterior fifths. In the two young specimens from Stat. 173 the rostrum extends considerably beyond the antennal scales and fully agrees with figure 7 on Plate CXXVI of the Report on the Challenger Macrura. In the larger one, in which the rostrum is 22,5 mm. long, the carapace 23,5 mm. and the abdomen 65 mm., so that this specimen measures 111 mm., the rostrum appears almost just as long as the carapace and is armed above with 6, below with 3 teeth ; the 3vd tooth of the upper border is placed over the orbital margin, the two following gradually increase in length, so that the 5th just reaches beyond the distal end of the ist antennular article, the 6th tooth, finally, stands more forward, nearly opposite to the middle of the antennal scale; the ist tooth of the lower border, placed a little farther distant from the apex of the rostrum than from the orbital margin, stands immediately behind the 6th tooth of the upper border and the somewhat larger 2nd tooth is contiguous to it and placed immediately before the 6th tooth, the much smaller 3rd tooth, finally, as small as the 6th of the upper, stands about midway between the 2nd tooth and the apex of the rostrum. The other specimen is 89 mm. long, the rostrum 18,75 mm., the carapace 18,25 mm- and the abdomen 52 mm.; the rostrum, slightly longer than the carapace, is f-dentate; the 5 proximal teeth gradually increase in length, the 3"1 stands above the orbital margin, while the 5"1 just projects beyond the distal end of ist antennular article; the teeth of the lower margin are situated on the middle third part and become slightly smaller from the ist to the 3"1, while the apex of the 3vd tooth is once and a half as far distant from that of the 2nd as the 2n<1 from the ist. 57 The specimen from Stat. 45 measures only 77 mm., rostrum 14 mm., carapace isYa mm-i abdomen 471/ mm., the rostrum which just reaches beyond the antennal scales and which is still a little shorter than the carapace, is armed above with 7, below with 3 teeth; the 3rd tooth of the upper border stands above the orbital margin, the 6th reaches just beyond ist antennular article, while the 7th stands immediately before the ist of the lower margin; the three teeth of the latter are placed on the middle third and the apex of the 2nd, which is slightly larger than the ist or the 3rd, is but little farther distant from that of the 3ld as from the ist. The rostrum of the specimen from Stat. 175 is broken off in the middle, but there are 6 teeth on the upper border, that gradually increase in length and of which the 3r<1 is placed above the orbital margin. The three young specimens from Stat. 178 are the youngest of all. In the hrst, long 50 mm., the rostrum (61/., mm.) reaches to the last third of the antennal scale and is distinctly shorter than the carapace ; the 6 teeth of the upper border reach to the distal end of ist antennular article, the 3ld is situated above the orbital margin and the three following are of equal size; the 3 teeth of the lower margin are placed on the middle third. In the youngest individual, in which the abdomen is wanting, the rostrum (41/,, mm.) is about half as long as the carapace (S1/* mm.) and reaches to the middle of the antennal scale; it extends straight forward, though slightly turned upward and is i-dentate; the teeth of the upper border are nearly equal, the foremost tooth is placed above the distal end of ist antennular article, immediately behind the ist of the three teeth of the lower margin, of which the 3rd is but little farther distant from the 2nd as the 2nd from the ist and a little farther distant from the apex of the rostrum than from the ist tooth. Of the third specimen, which is the largest of the three, the rostrum is broken. General distribution: Arabian Sea (Alcock); Bay of Bengal (Alcock) ; Andaman Sea (Alcock) ; Siberut Island (Balss) ; South of the Philippine Islands (Spence Bate) ; Japan (Spence Bate, Balss); Banda Island (Spence Bate); Kermadec Islands (Spence Bate); North of the Falkland Islands (Spence Bate). 2. Acanthephyra purpurea A. M.-Edw. PI. VI, Fig. 12 — 12 c. Acanthephyra purpurea A. Milne-Edwards, Compt. Rend. Acad. Sciences Paris, T. XCIII, 1881, p. 935. Acanthephyra purpurea Stanley W. Kemp, "Fisheries, Ireland, Sci. Invest.", 1905, I. [1906], p. 4, Plates I and II, Fig. 1 — 3 (Synonymy). Acanthephyra purpurea H. J. Hansen, The Danish Ingolf-Expedition, Vol. III. 2. Crustacea Malacostraca. I. Copenhagen, 1908, p. 75. Acanthephyra purpurea Stanley W. Kemp, "Fisheries, Ireland, Sci. Invest.", 1908, I. [ 1910}, p. 56 — 58 and in: Transact. Linnean Soc. London. 2nd Ser., Zoology, Vol. XVI, Pt. 1, 1913, p. 64. Acanthephyra purpurea K. Stephensen, Vidensk. Meddel. fra den Naturh. Foren. Vol. 64, 1912, p. 64 and 329. Acanthephyra purpurea O. Pesta, Zoologischer Anzeiger, Vol. XLII, 191 3, p. 70. Acanthephyra purpurea H. Lenz and K. Strunck, Deutsche Südpolar-Expedition 1901 — 1903, Vol. XV. Zoölogie VII, Berlin 1914, p. 326. Acanthephyra par-ra H. Coutière, Buil. Musée Océanogr. de Monaco, 1905, p. 15, Fig. 5. Acanthephyra purpureus Th. R. R. Stebbing, South African Crustacea, Part VIII, London, 1915 (Annals South African Museum, XV, Part II, 1915), p. 96. SIBOGA-EXPEDITIE XXXIX a3. 8 58 Stat. 141. Aug. 5. i°o'.4S., I27°25'.3E. From 150001. depth to surface. Bottom very fine, hard sand. 1 young specimen. Stat. 203. Sept. 19. 30 32'.5 S., I24°I5'.5 E. HENSEN vertical net from 1500 m. depth to surface. 4 specimens, parva stage. Stat. 208. Sept. 22. 5°39'S., I22°I2'E. South of Muna Island. 1886 m. Bottom solid green mud. i male. Stat. 230. Nov. 14. 3°58'S., i28°2o'E. South-east of Ambon. From a depth of 2000 m. to surface. 3 young specimens, 2 of vvhich belong to the parva stage. Stat. 243. Dec. 2. 4°3o'.2S., I29°25'E. From a depth of 1000 m. to surface. 1 specimen, parva stage. The specimen from Stat. 141 is nearly 32 mm. long.. The rostrum, 6 mm. long, is straight, slightly longer than the carapace (5 mm.) and faintly turned upward; it is if-dentate, the three posterior teeth of the upper border are placed behind the posterior tooth of the lower, the two posterior and the two distal teeth of the upper border stand a little closer together than the other teeth, which are placed at equal distances from one another and the anterior tooth of the upper border is one and a half as far distant from the tip as from the penultimate; except the two posterior the teeth of the lower margin are paired with those of the upper. The rostrum projects by the distal 6th part beyond the antennal scales. The 3rd abdominal somite has the same form as in Fig. 5, 1 of Coutière's quoted paper, the carinate upper border being much more strongly curve d than in the adult specimen from Stat. 208; the spines at the posterior extremity of the dorsal margin of the three following tergites are smaller than that of the 3rd and the equal spines of the 5lh and 6th tergite are a little larger than that of the 4*. The 6th somite, 4,5 mm. long, is almost twice as long as the 5lh (2,36 mm.) and twice as long as wide anteriorly. Telson 4,4 mm. long, almost as long as the 6th somite and projecting by half the length of the long terminal spines beyond the exopodite of the uropods; the lateral margins are armed on the left side with 5, on the right with 4 spines, the anterior or ist pair of lateral spines are a little farther distant from the 2nd as the following from one another. The four specimens from Stat. 203 belong to the^J>arva stage and are 13 — 17 mm. long. In the largest specimen the rostrum projects straight forwards to the far end of ist antennular article and is f-dentate (Fig. 12a); the 8 teeth of the upper border are placed on the rostrum proper, the ist or posterior just in front of the orbital margin, the teeth diminish regularly in size to the 8th, which is about twice as far distant from the ist as from the extremity of the rostrum ; the 3 teeth of the lower margin are m uch smaller and placed opposite the 3 anterior teeth of the upper. In the second specimen the rostrum is as long as the eyestalks and the unarmed apex is slightly turned upwards; it is y-dentate, the teeth are placed like in the preceding specimen and their form and size are also the same. The rostrum of the third agrees in length and characters with that of the ist, but it is ï-dentate and the three teeth of the lower margin alternate with the 4 distal teeth of the upper; in the fourth specimen the rostrum is mutilated. In the three specimens in which the rostrum is preserved, the 3rd abdominal somite shows the characteristic shape of the type of Acanth. parva paucidens Cout. (H. Coutière, 1. c. Fig- 5i 3)i so tnat one at first sight is inclined to regard these specimens as belonging to a 59 different species-, in the fourth specimen the 3rd tergite is mutilated, like the rostrum. The measurements in millimeters of the 5th and 6th somites and of the telson are in the three well preserved specimens the following : Rostrum 1 ï f Length of slh tergum ... 1,3 1,2 1 Length of 65 i,5 i,7 i,75 84 23 36 4,5 1,6 125 40 52,5 2,25 3,25 130 42 57 2,5 2,75 147 48 66 2,4 0,85 16 18 '9 8 8,25 S,75 18 19,5 20 General distribution: The typical species is known from off Kandavu, Fiji Islands (Bate); South of the Philippine Islands (Bate); Hawaiian Islands (M. J. Rathbun). When the 83 species described by Col. Alcock should indeed prove to be identical with that which was collected by this expedition, the variety Sibogae should also occur in the Gulf of Manar and in the Bay of Bengal (Alcock). 3. Nematocarcinus undulatipes Bate. PI. VIII, Fig. 20 — 20 h. Nematocarcinus undulatipes C. Spence Bate, Report Challenger Macrura, 1888, p. 801, PI. CXXX. Nematocarcinus undulatipes \V. T. Calman, in: Guide to the Crustacea, Arachnida etc. exlii- bited in the Department of Zoology, British Museum (Natural History), London 1910, p. 52, Fig. 32 (photograph of a mounted specimen). Nematocarcinus paucidentatus C. Spence Bate, 1. c. p. 816, Plate CXXXII, Fig. 9. Nematocarcinus cursor A. Alcock, Descr. Catal. Indian Deep-Sea Crustacea. Calcutta 1901, p. 89. Nematocarcinus cursor, var. paucidentatus A. Alcock, 1. c. p. 90. Stat. 45. April 6. 70 24' S., ii8°15'.2E. 794 m. Bottom fine grey mud, with some radiolariae and diatomes. 1 male and 1 young specimen which is badly damaged. Stat. 88. June 20. o°34'.6N., II9°8'.5E. 1301 m. Bottom fine grey mud; trawl chiefly brought up yellow mud. 1 young specimen. Stat. 101. June 30. 6°I5'N., i20°2i'E. Sulu Sea. 1270 m. Bottom fine grey mud (Globigerinae). 1 adult female without eggs. Stat. 122. July 17. i°58'.5N., i25°o'.5 E. 1264 — 1 165 m. Bottom stone. 3 males. Stat. 173. Aug. 28. 3°27'S., I3I?o'.5 E. 567 m. Bottom fine, yellow grey mud. 3 males. Stat. 262. Dec. 18. 5°53'.8S., I32°48'.8 E. 5Ó0 m. Bottom solid bluish grey mud, upper layer more liquid and brown mud. 28 specimens, viz. 22 ova-bearing and 3 younger females, 1 male and 2 very young specimens. Stat. 314. Febr. 17, 1900. 70 36' S., U7°30'.8E. 694 m. Bottom fine, sandy mud. 1 male and 2 young females. Stat. 316. Febr. 19, 1900. 70 19'. 4 S., u6°49'.5 F. 538 m. Bottom fine, dark brown sandy mud. 4 young specimens. At first I did hesitate to refer these specimens to Xcmat. undulatipes of the Report on the Challenger Macrura, because the legs of the ist and 2nd pair do not agree with Bate's figure on Plate CXXX, as regards the proportion between the length of chela and carpus: according to that figure the chela of the ist pair should measure half the length of the carpus, while the chela of the 2nd pair should be even slightly longer than one-third of that joint. My presumption, however, that these legs are figured inaccurately, proved to be right, for, having applied to him for this question, Dr. Calman has very kindly examined for me the type specimens of this species and wrote me the following : "A good many of the Challenger specimens of Nematocarcinus undulatipes have lost the first two pairs of legs. The largest specimen from Station 200 (off Sibago) is a female measuring about 93 mm. in total length and is in this condition. In a female (ovigerous) of more than 86 mm. (telson broken) the first legs extend beyond the antennal scale by less than one-third of the carpus; the carpus of first legs measures 16 mm. and the chela 4,5 mm.; in the second legs the carpus measures 30,5 mm. and the chela 4,5 mm. In an ovigerous female of 80 mm. total length the first legs have the carpus measuring 13,75 mm- and the chela 4 mm.; the second legs are wanting. The specimen from Station 194 (off Banda Island) has lost both first and second leg's''. These measurements now fully agree with those of the specimens of this collection 84 (see the Table at p. 89) and therefore they certainly belong to this species. Professor Alcock, however, may also be right when considering the species which occurs in the Arabian Sea, the Gulf of Manar and the Bay of Bengal and which is no doubt the same as that which was collected by the "Siboga", as identical with Nemat. cursor A. M.-Edw. of the Antilles, for the species which was collected by the "Siboga", agrees indeed very well with the figure of Nemat. cursor in the "Recueil de Figures de Crustacés nouveaux 011 peu connus", published by A. Milne-Edwards in 1883, a copy of which I had the honour to receive from the author — never- theless I not venture to follow him in this opinion, because the legs of the 2nd and o f the 5,h pair of our specimens show constant differences, as regards their measurements, from those of specimens of Nemat. cursor A . M .-Edw. taken off the east coast of the United States (S. I. Smith, Report on the Decapod Crustacea of the Albatross Dredgings off the east coast of the United States during the summer and autumn of 1884. Wash. 1886, p. 62). The measurements of one male and three females are mentioned in this paper and I wish to call attention to the fact that some of Smith's measurements and also a part of his description do not agree with the figure of Nemat. cursor in the above- mentioned "Recueil". This figure may therefore perhaps once prove to be partly inaccurate, which is made probable by the fact that the dactylus of the 5th leg shows in this figure the same size and shape as the dactylus of the two preceding legs, which is not the case in this species. Unfortunately in his description of Nemat. cursor, published in 18S1, A. Milne-Edwards has given no measurements at all of the legs. The male from Stat. 45 is 87 mm. long from tip of rostrum to tip of telson. The rostrum extends almost to the middle of 3vd antennular article and is \-dentate; 5 teeth stand on the carapace, posterior to the orbital margin, and the tip of the rostrum is somewhat upturned. The telson, feebly furrowed longitudinally, bears 8 or 9 pairs of dorsolateral spinules, inclusive the pair near the tip ; the spinules are implanted dorsally on the borders of the dorsal groove, except those of the 3rd and 5th pair, taking the hindmost as the first, which are placed more laterally, nearer to the lateral margins. The legs of ist pair reach by the chela and one-third of the carpus beyond the antennal scale; the other legs are all partly wanting. The young specimen from Stat. 88 is 38 mm. long. Rostrum y-dentate, reaching to the middle of 2nd antennular article, five teeth on the carapace. Legs of ist pair extending by the chela and one-fourth of the carpus beyond the antennal scale. Sixth somite of abdomen 7 mm. long, 2,45 mm. broad, almost 3-times as long as broad, telson long 6 mm., without the terminal spines, and appearing as long as the outer uropod when the terminal spines are included. The female without eggs from Stat. 101, in which the rostrum is broken off, is 87 mm. long from the far end of antennular peduncle to tip of telson and appears therefore almost adult. Carpus of the ist pair of legs 13,4 mm. long, reaching by ajittlemore than one-fifth of its length, viz. 3 mm., beyond the antennal scale, chela 3,4 mm. long, one-fourth of the carpus. Legs of the 2nd pair 66 mm. long, extending by the chela, the carpus and one-fourth of the merus beyond the antennal scale; merus 19 mm. long, carpus 27,5 mm., chela 3,5 mm. Legs of the 4th pair 76 mm. long, almost as long as the body, and extending by the chela, the carpus and one-third of the merus beyond the antennal scale: merus, carpus, propodus and dactylus & 85 respectively 23,5 mm., 29,5 mm., 2,5 mm. and 2,75 mm. long. The other legs are wanting-. Telson like in the preceding specimen with 8 pairs of dorso-lateral spinules. The largest male from Stat. 122 is full-grown, 93 or 94 mm. long, the carapace, rostrum included, beino- 27 mm. long. The rostrum that measures 7 mm., extends almost to the middle of 3rd antennular article and is Y-dentate; 5 teeth stand on the carapace, the 6th above the orbital margin and the teeth are closely placed together; the distance between the foremost tooth and the tip of the rostrum measures one-third of the latter and this unarmed tip is slightly upturned. The tooth on the lower margin is situated midway between the foremost tooth of the upper maro-in and the apex of the rostrum. Sixth somite of abdomen 13,5 mm. long, 5,75 mm. broad, telson 15 mm. long; the telson, faintly grooved longitudinally on the anterior half and flattened on the posterior, is armed with 7 somewhat irregularly planted, dorso-lateral spinules, including those near the tip, and is as long as the outer uropod, when the terminal spinules are excluded. In the second, somewhat smaller male the rostrum runs straight forward almost to the distal extremity of the antennular peduncle and the tip is hardly upturned; the upper border bears 9 teeth, four of which are on the carapace, the 5th above the orbital margin; the teeth are not of the same form and close set like in the preceding specimen, but the penultimate and the antepenultimate tooth are farther distant from one another and from the 6th, i. e. longer, than the other teeth. The tooth on the lower margin is very small, directed straight forward (not downward as in the largest male) and one and a half as far distant from the tip of the rostrum as from the foremost tooth of the upper margin. In this specimen the legs are also wanting. The youngest male from Stat. 122 measures 65 mm., the carapace, rostrum included, being 20,2 mm. long. The rostrum, 5,45 mm. long, resembles that of the preceding specimen and reaches just beyond the middle of 3rd antennular article; the upper margin is armed with 10 teeth, the 5th stands above the orbital margin, but the penultimate and the antepenultimate tooth are not longer than the rest; apex of rostrum and lower tooth as in the preceding male. Sixth abdominal somite 9,2 mm. long, 4,25 mm. broad; telson 10,25 mm- l°ngi onb' as l°ng as the inner uropod and distinctly shorter than the outer, with 9 pairs of dorso-lateral spinules. The carpus, long 10,5 mm., of the ist pair of legs projects almost by one-third of its length beyond the antennal scale; chela 3,25 mm. long, nearly one-third of the carpus. The three males from Stat. 173 are nearly of equal size, almost full-grown. The largest specimen is 80 mm. long, the carapace measuring 24,5 mm., rostrum included. The rostrum, 5,45 mm. long, reaches to the far end of 2nd antennular article; the upper border, slightly concave above the orbital margin, while the tip is not upturned, is armed with 12 teeth, 6 of which stand on the carapace ; the three distal teeth are farther distant from one another, i. e. a little longer, than the rest. Tip of anterior tooth one and a half as far distant from the tip of the rostrum as from that of the penultimate. Tooth on lower margin small, directed forward. The telson hardly reaches by its terminal spinules the tip of the outer uropod. The carpus, long 14 mm., of the ist pair of legs extends by one-third of its length beyond the antennal scale. Other legs wanting-. O o The rostrum of the 2nd specimen, long 78 or 79 mm., resembles that of the first and is also 1 '^-dentate, but the foremost tooth is as far distant from the tip of the rostrum as from 86 the penultimate and one and a half as far distant from the penultimate as the penultimate from the antepenultimate. The peraeopods of the ist pair measure 3$ mm. and the distal third of the carpus, which is 13,5 mm. long, reaches beyond the antennal scale. Legs of the 2nd pair 66 mm. long, the merus, long 17 mm., extends by a little more than one-third its length, viz. 7 mm., beyond the antennal scale; carpus 28 mm. long, chela 3,75 mm. Other legs lost. In the 3ld specimen, finally, the rostrum reaches just beyond the 2nd antennular article and is armed above with 14 teeth, six of which are on the carapace, the 7th above the orbital margin; the teeth are closely set, except the ioth and the iith, which are farther distant from one another and from the 9"1 than the rest, appearing therefore longer ; tip of rostrum a little upturned. Lower tooth midway between the tip and the foremost tooth of the upper margin. All the lees are wantinsf. The 28 specimens from Stat. 262 are mostly vvell preserved, as regards the legs etc, 22 are ova-bearing females, but there is only one male, which is 70 mm. long, while the carapace, rostrum included, measures 21,5 mm. The measurements of 5 ova-bearing females and one young female are indicated in the Table at p. 89. The largest egg-bearing female measures 104 mm. from tip of rostrum to tip of telson, while the smallest female, provided with eggs, is 75 mm. long. The single specimen of Nemai. paucidentatus Bate, collected by the "Challenger", was 100 mm. long and the carapace, rostrum included, measured a little less than one-third the length of the animal, exclusive of the rostrum and the telson (C. Spencé Bate, 1. c. p. 816). In all the specimens from Stat. 262, like also in those from the other Stations, the carapace, rostrum included, measures a little more than one-third the length of the animal, without rostrum and telson: the measurements of the female and of the male of Nemai. undulatipes, mentioned by Bate (1. c. p. 802), on the contrary, agree very well with those of the "Siboga" species. As regards the relative length and shape of carapace and abdomen, the "Siboga" specimens resemble also the figure of Nemat. cursor A. M.-Edw. in the above-mentioned "Recueil" and agree likewise with the measurements published by S. I. Smith (1. c), but the dorsal border of the cardiac region, that in this figure runs quite straight, appears in our specimens, however, slightly convex. Excepting the two youngest individuals, like also an ova-bearing female in which the rostrum is broken off, the rostral formulae of 25 specimens from Stat. 262 are the following. In 3 specimens, all ova-bearing, the upper margin is armed with nine teeth, in 5, three of which are ova-bearing, with ten, in 8, namely in the male and in 7 females, 6 of which are ova-bearing, with eleven, in 4, all ova-bearing, with twelve, in 3, all with eggs, with thirteen and in 2, also ova-bearing, with fourteen teeth, so that in two-thirds of the specimens 9 — 11 (usually 11) teeth are observed and only in one-third 12 — 14. Excepting 3 ova-bearing specimens the lower border is constantly armed with one tooth near the tip. In more than half the number of the specimens, namely in 13, five teeth of the upper margin are implanted on the carapace proper, in 8 specimens six, in 3 four and only in 1 specimen, an egg-bearing female, seven teeth occur behind the orbital margin. Among 20 specimens the rostrum did extend in 9 to the distal extremity of 2nd antennular article, in 10 to the middle of 3ld and only in one ova-bearing female to the far end of the peduncle. The tip of the «7 rostrum is often a little upturned and sometimes the whole rostrum is slightly ascendant; like in the males from the Stations 122 and 173 some teeth on the rostrum proper are often longer, i. e. more distant from one another, than the rest. We may conclude from the preceding observations that the number of teeth on the upper margin of the rostrum varies rather much, from 9 to 14, and Aixock's suggestion that a variety with 7 — 9, usually 9, teeth should be distinguished from a more typical form with 1^ — 15 teeth, appears therefore not justified: in the species, examined by that author, usually 15 teeth were placed on the upper border, in the "Siboga" specimens 11, as has been indicated above. Post-rostral carina distinct, reaching to near the after limit of the gastric region. A microscopical tubercle, 0,3 mm. broad, exists in the middorsal line of the cardiac region, about at the postenor fourth. Like in Nemat. ensifer (S. I. Smith) var. producta Bate and in Nemat. tenuirostris Bate var. Sibogae the shallow depression between the gastric and cardiac region does not continue into the oblique lateral part of the cervical groove, which for the rest agrees with that of these two species. Branchio-cardiac groove well defined, curved, not reaching the posterior margin of the carapace nor uniting anteriorly with the cervical groove. Orbital oroove distinct. Abdomen a little more than twice as long as the carapace, rostrum included. Third abdominal tergum moderately prominent posteriorly. Sixth somite in adult individuals twice as long as broad. Telson constantly a little longer than 6th somite, flattened and slightly grooved dorsally, with S or 9 pairs of dorsolateral spinules ; the tip is armed with 3 pairs of spinules, one pair at the extremity, at each side of which the spinules of the longest pair are implanted, while those of the 3rd pair, the shortest of all, are implanted above those of the 2nd. While in some specimens the telson extends by the terminal spinules beyond the outer uropods, in other ones, as in the female Nu 1 of the Table, it is much shorter and does even not reach the tip of the endopodite. Like in the specimens of Nemat. cursor A. M.-Edw. from off the east coast of the United States, the length of the eye and stalk does equal or exceed the breadth of the antennal scale; the eye extends almost to the far end of basal antennular article. In most specimens the terminal spine of the scaphocerite reaches just beyond the tip of the blade. The antennular peduncle, which is slightly longer than the rostrum, extends almost to the middle of the scapho- cerite; 3rd article a little longer than 2nd, stylocerite slightly shorter than basal article. Upper flagellum 21/2-times as long as the animal from tip of rostrum to tip of telson, lower flagellum a little more than 3-times that length ; the former somewhat thickened at base to a little beyond the tip of the antennal scale, this thickened portion a little longer than the peduncle. Antennal flagellum just as long as the lower flagellum of the upper antennae. The external maxillipeds reach in the adult female, long 104 mm., six-sevenths of the way along the antennal scale ; the penultimate joint reaches as far forward as the antennular peduncle, terminal joint shorter than the penultimate with the spine at the distal extremity very small. The peraeopods of the ist pair extend by the chela and one-third or sometimes even less than one-third of the carpus beyond the antennal scale; as regards their measurements they agree with Nemat. cursor A. M.-Edw. from the east coast of the United 88 States (S. I. Smith, 1. c), in the figure of the "Recueil", however, the chelae measure just one-third of the carpus, while, according to Smith, their length should be only one-fourth or little more. The ischium is armed with 3 or 4 movable spinules along the lower border, the merus with one spinule just behind the middle, sometimes with a second between it and the proximal articulation ; carpus unarmed, slightly and gradually thickened distally. The legs of the 2nd pair project by the chela, carpus and ljtt or 7? °f the merus beyond the antennal scale. As results from comparing the measurements on the Table with those that are mentioned by Smith, the 2nd legs should in the species, collected by the "Siboga", like in the Nemat. cursor of Alcock, be s o m e w h a t s h o r t e r in proportion to the entire length than in Nemat. cursor A. M.-Edw. from the east coast of the United States: in the indian species the 2nd legs measure just t h ree-fou r t hs the length of the animal, while they should be, according to Professor Smith, in Nemat. cursor nearly as long as the animal or but little shorter. Another difference is shown by the chelae, which in Nemat. uudulatipes measure o ne- seven th of the carpus, but, according to S. I. Smith, in ATcmat. cursor scarcely more than a tenth. In the figure of Nemat. cursor in the "Recueil" of 1883 the 2nd legs appear, however, even a little shorter than in the "Siboga" species and the carpus appears but 5-times as long as the chela! In the "Siboga" species the ischium is armed with a movable spinule not far from the proximal extremity and with another near the far end, the merus with 3 or 4 movable spinules along the posterior border and another at the upper side of the thickened distal extremity. The legs of the 3ld and of the 4th pair show nearly the same measurements as are mentioned by S. I. Smith. The legs of the 3,d pair, about as long as the animal, though not shorter, project by half the merus beyond the antennal scale; the carpus is one-third, rarely one-fifth, longer than the merus and the dactylus, which is slightly waved, is 11/, — i2/3-times as long as the propodus. Ischium armed on the lower border with a small spine near the base and with a larger one near the distal extremity; merus with 3 — 5 small spinules both on the lower and the upper border and with a somewhat larger spine on the upper side of the thickened distal extremity. The peraeopods of the 4* pair are as long as those of the 3rd and reach also by one- half the merus beyond the antennal scale ; the spinulation of ischium and merus is the same, but the dactylus is comparatively shorter, being only one-fifth longer than the propodus. While, according to Smith, in the female of Nemat. cursor A. M.-Edw. from off the east coast of the United States the legs of the 5th pair should be as long as those of the 3rd and the 4th, namely just as long as the animal, they appear in the female specimens of Nemat. tmdulatipes considerably longer, namely one-fourth longer than the distance between tip of rostrum and tip of telson ; another difference is presented by the carpus, which in the indian form is longer with regard to the merus, namely about one and a half as long as the Jatter. Dactylus rudimentary, measuring hardly one-third of the propodus. Except the terminal joints, the three posterior legs of the "Siboga" species resemble pretty well the figure in the "Recueil". The legs of the 5"1 pair project also by half the merus beyond the antennal scale an d the spinulation of ischium and merus is the same as in the 3rd and 4"1 pair of legs. 89 The male from Stat. 314 is 80 mm. long, the carapace, rostrum included, 23,5 mm., the rostrum 5,7 mm., sixth abdominal somite 10,5 mm. long and 5,6 mm. broad, telson 11 -5 mm. lono-. The rostrum that reaches to the middle of 3"1 antennular article, is \° -dentate •, 5 teeth stand on the carapace, the 6th above the orbital margin, the first 8 teeth are closely-set, the oth appears a little longer, but the foremost tooth is almost twice as long as the penultimate and its distance from the apex of the rostrum that is slightly upturned, is a little longer than its distance from the penultimate tooth. Inferior tooth near tip of rostrum. Telson hardly longer than outer uropod. Legs wanting. The laro-er female measures about 56 mm., the carapace, rostrum included, being 16,75 mm- lono- sixth abdominal somite 8 mm. long and 4 mm. broad, telson 8,4 mm. long. The rostrum, 3,5 mm. long and hardly reaching beyond basal antennular article, is j-dentate-, 4 teeth stand on the carapace, the foremost tooth is somewhat longer than the preceding and a little longer than its distance from the tip of the rostrum which is not upturned. The peraeopods of the ist pair reach by one-fifth of the carpus beyond the antennal scale, the measurements of the legs are indicated in the Table. The other female is younger and the legs of the ist pair extend only by x/s °f tne carpus beyond the antennal scale. Rostrum ^-dentate, reaching to the. middle of 2nd antennular article. The largest of the 4 specimens from Stat. 316 measures 50 mm., the carapace, rostrum included, being 15,5 mm. long. The rostrum, which is 3,1 mm. long, reaches hardly beyond ist antennular article and the apex is not turned upward; upper margin with 11 teeth, of which the 6th stands above the orbital margin and the anterior of which is a little longer than the preceding. The legs of the ist pair extend by one-third the carpus beyond the scaphocerite and the dactyli of the 3rd pair are one and a half as long as the propodus. In another specimen, about of the same size, the rostrum is also ±± -dentate, but there is a large hiatus between the 9th and the ioth tooth, evidently an abnormality ; anterior tooth very small, tip horizontal. Legs wanting. In the two last specimens the ist pair extend respectively by one-third and one-fifth of the carpus beyond the antennal scale, the rostrum is in the latter r-dentate, in the other '/ ; the other legs are also wanting. Table of measurements in millimeters of Nemat. undulatipes Bate. Length from tip of rostrum to tip of telson Length of carapace, including rostrum . . : Length of carapace without rostrum .... Length of rostrum Length of 6th abdominal somite Breadth of 6th abdominal somite Length of telson Length of eyestalk and eye Greatest diameter of eye Length of antennal scale Breadth of antennal scale Length of last joint of outer maxilliped . Length of penultimate joint of outer maxilliped S1EOGA-F.XPED1TIE XXXIX a2. I 2 3 4 5 6 104 95 94 91 80 78 33 29.5 28,5 28,25 24 23.5 24 22,1 22 21,25 18,5 18 9 7.4 6,5 7 5.5 5.5 14 12,7 12 12 10,25 11 6,6 6,4 6,i 5-75 5.2 5 15.5 i5>3 14.5 i4.5 12,5 12,5 3.8 3-9 3.75 3.5 3.25 3.i 3 3.i 2,75 2,9 2,45 2,4 18 16,2 16 15,25 14 14 4 3.5 3,45 3.75 2,75 2,8 7 6,75 6,5 4,75 5 4,75 | 9 8,25 7.75 8 6,5 6,5 7 56 17 13,6 3.4 8 4.i 8,5 2,3 2 9.5 2 3.5 4.5 9o Length of first leg. . „ „ merus . . , „ carpus . . „ „ chela . . „ „ dactylus Length of second leg. „ „ merus . . „ „ carpus . . „ chela . . „ „ dactylus Length of third leg . , „ merus . . „ carpus . . „ „ propodus . v „ dactylus Length of fourth leg . „ „ merus . . „ carpus . . „ „ propodus . „ „ dactylus . Length of fifth leg „ . merus . carpus . propodus dactylus I 2 3 4 5 6 41.5 40 39 39 33 33 10,5 10 9.5 10 8,5 8,5 16,5 '5.75 15.4 15,5 14 13,25 4-75 4.4 4 4 3,75 3,75 1,6 i.5 i.5 i,4 i,3 i.4 76 70 69 68 61 21,5 19.5 19 18,5 16,5 3i-5 29 28,5 28,5 24,5 4,5 4,25 4.i 4.2 3.8 i.5 '-5 i.5 i.5 i.4 114 IOI 102 98 94 94 35.5 31 33 29 28 30 46 4i.5 41 40 38 36 3 2,75 3 2,75 2,75 3 5 4 4.5 4,25 4,5 4.5 115 106 108 100 94 36 33 33 3i,5 30 49 46,5 46,5 44 39,5 2,75 2,5 2,5 2,5 2,5 3,25 3 3 2,75 3 129 119 11S 118 41 39 39 37 59 53.5 54 56 2,6 2,5 2,5 2,5 o,75 o.7 0,7 o,75 7 22,5 5,5 8,75 2,6 12,5 66 20,5 24 2,3 4 65 21,5 25 2,25 3,25 64 22 27 2 0,4 N° 1 — 4 and 6, ova-bearing females from Stat. 262; N° 5 female without eggs from Stat. 262; N° 7 young female from Stat. 314. General distribution: Nematocarcimis undulatipes Bate is known from off Sibago, Philippine Islands and from off south of the latter, from north of the Kermadec Islands and from off Banda (Spence Bate); the same species has been observed in the Arabian Sea, the Gulf of Manar and the Bay of Bengal (Alcock) and, when Xemat. paitcidentatus Bate is identical, also off Kandavu, Fiji Islands. 4. Nematocarcinus gracilis Bate. PI. VIII and IX, Fig. 21 — 21//. Nematocarcimis gracilis C. Spence Bate, Report Challenger Macrura, 1888, p. 815, PI. CXXXII, Fig. 8. Nematocarcinus gracilis A. Alcock, Descr. Cat. Indian Deep-Sea Crust. Decap. Macr. Anom., Calcutta, 1901, p. 90. Nematocarcimis gracilis M. J. Rathbun, The Brachyura and Macrura of the Hawaiian Islands, Wash. 1906, p. 927. Stat. 262. Dec. 18. 5°53'.8S., I32°48'.8E. 560 m. Bottom solid bluish grey mud, upper layer more liquid and brown mud. 2 males and 4 females, 3 of which egg-bearing. Stat. 300. January 30, 1900. io°48'.6S., I23°23'. 1 E. 918 m. Bottom fine grey mud. One adult female without e^gs. This species, though closely resembling Ncmat. undulatipes Bate, may easily be distinguished 9i i" by the larger nuniber (14 — 22) of teeth on the upper margin of the rostrum, 2" by the lono-er legs, especially those of the ist pair that extend by half or more than half the carpus beyond the antennal scale, being a little more than one and a half as long as the c a r a p a c e , rostrum i n c 1 u d e d , 3° by the dactyli of yd and 4th pair of legs which are not longer, but distinctly shorter than the propodi. The largest of the 7 specimens is the female from Stat. 300, which is 114 mm. long: unfortunately the legs are wanting, except the ist pair. The rostrum (Fig. 21 af), gently ascendant, reaches almost to the middle of 3rd antennular article; the upper margin, that is slightly concave above the eyes, is armed with 14 close-set teeth, 7 of which stand on the carapace, while the foremost is placed, in front of the eyes, just beyond the middle of the rostrum proper, between this tooth and the apex the upper margin runs quite straight. The lower tooth, directed forward and downward, is situated about midway between the foremost tooth and the tip of the rostrum. In the two males from Stat. 262 the rostrum runs straight forward to a little beyond 2nd anten- nular article and is ^-dentate; 6 teeth stand on the carapace, the anterior tooth just beyond basal antennular article, so that the, slightly upturned, distal unarmed part of the upper margin appears rather short. The lower tooth which is directed horizontally forward, is placed, in the larger male, just before the foremost tooth of the upper border, in the other midway between this tooth and the tip. In the egg-bearing female the rostrum is horizontal and extends a little beyond 2nd antennular article; the upper border is armed with 14 teeth, 7 of which stand on the carapace, while the foremost is implanted just on the middle of the rostrum proper, so that the distal unarmed part appears just as long as the distance between the foremost tooth and the orbital margin. The lower tooth is placed twice as far from the foremost tooth as from the apex of the rostrum. In the second female the rostrum, of which the unarmed distal part is slightly upturned, extends a little beyond 2nd antennular article and bears 16 teeth, 7 of which stand on the carapace, while the anterior tooth is implanted above the far end of basal antennular article; the two anterior teeth are a little larger, i. e. longer, than the preceding and the unarmed distal part measures one-third the length of the rostrum proper. The well- developed lower tooth is directed horizontally forward and placed midway between the anterior tooth and the tip. The rostrum of the third ova-bearing female resembles that of the second, but of the 16 closely-set and equally long teeth 6 stand on the carapace and the tip is hardly upturned. The female without eggs belongs no doubt to this species, because the legs of the i5t pair reach about by two-thirds of the carpus beyond the antennal scale, but the rostrum that extends horizontally to the far end of 2nd antennular article, seems to bear only 12 teeth, for the 3 anterior are broken off; 6 stand on the carapace and the unarmed part of the upper border is almost half as long as the rostrum. For the rest the carapace of this species resembles that of A'emat. undulatipes Bate and the abdomen does also not appear to differ, the posterior border of the 3rd abdominal tergum being as much produced in the middle line and the telson presenting the same form and length. Also as regards the eyestalks and eyes and the two pairs of antennae both species apparently resemble one another. 92 According to the Table of measurements on p. 89 in Nemat. undulatipes Bate the ist pair of legs are shorter than twice the length of the carapace, the rostrum excluded, in Nemat. gracilis, however, longer than twice the length of the carapace without the rostrum and, while in the former these legs reach only by one-third of the carpus or still less beyond the antennal scale, in Nemat. gracilis one-half to more than two-thirds of the carpus extend beyond the scaphocerite. In the two males from Stat. 262 two-thirds of the carpus reach beyond the antennal scales, in three females three-fifths, in the fourth female and in the female from Stat. 300 one-half the length of the carpus. The spinulation of ischium and merus is the same as in Nemat. undulatipes. Owing probably to the specimens from Stat. 262 being not yet full-grown, the legs of the 2nd pair are still distinctly shorter than the entire body, while, according to Col. Alcock, whose largest female measured 84 mm., they should be nearly as long as it; these legs project, in the ova-bearing females from Stat. 262, by the chela, carpus and about one-third of the merus beyond the antennal scale. The chela measures one-sixth the length of the carpus, but for the rest the relative measurements agree with those of Nemat. undulatipes; the spinulation of the ischium is the same as in this species, the merus, however, is not only armed with 4 or 5 spinules on the posterior border, but the opposite border bears also 3 or 4 similar spinules, besides the somewhat larger spine at the thickened distal extremity. Ouite characteristic are the legs of the 3rd and 4th pair. The peraeopods of the 3rd pair are in our specimens nearly as long as the entire body, while in full-grown individuals they are very much longer than it; they project by the chela, the carpus and two-thirds of the merus beyond the antennal scale. The proportion between the length of merus, carpus and propodus is the same as in Nemat. undulatipes, but the dactyli, in stead of being longer, are in Nemat. gracilis distinctly shorter than the propodi, meas uring only two- thirds or three-fifths of these joints; the dactyli have a characteristic, waved form. Spinulation like in Nemat. undulatipes, but the proximal spinule of the ischium seems to be wanting. The legs of the 4th pair are about as long as the 3rd and project in the male by two- thirds, in the female by three-fifths of the merus beyond the antennal scale ; these legs are in our specimens comparatively shorter than in Nemat. undulatipes and, like in the 3ld pair, the dactyli measure only two-thirds of the propodi, while they show the same form as in these legs. Spinulation like in the 3rd pair. Unfortunately the legs of the 5th pair are only complete in the larger male from Stat. 262, they are here a little shorter than the body and project by about one-third of the meri beyond the antennal scale; the ischium is unarmed and the spinules of the merus are also less in number than in the two preceding legs. Terminal joints like in Nemat. undulatipes. Like the typical specimens collected by the "Challenger", also the specimens from Stat. 262 were taken together with the numerous individuals of Nemat. undulatipes Bate. 93 Measurements in millimeters of Nematocarcinus gracilis Bate. Length from tip of rostrum to tip of telson . Length of carapace, including rostrum . . . Length of carapace, without rostrum .... Length of rostrum Length of sixth abdominal somite Breadth of sixth abdominal somite Length of telson Length of eyestalk and eye Greatest diameter of eye Length of antennal scale Breadth of antennal scale Length of terminal joint of outer maxilliped . Length of penultimate joint of outer maxilliped Length of the leg of ist pair „ „ merus „ „ carpus „ „ chela . „ „ dactylus Length of the leg of 2nd pair > merus „ „ carpus v chela „ „ dactylus Length of the leg of 3rd pair „ „ merus „ carpus „ „ propodus „ „ dactylus Length of the leg of 4th pair . merus „ carpus „ „ propodus . „ dactylus . . . Length of the leg of 5'h pair „ „ merus .... „ carpus .... „ » propodus . . . a „ dactylus 72 19.75 14-35 5-4 10,25 4,6 11,25 3.5 2.7 ii.5 2,5 4.5 6,4 34 9 14 3-6 1,25 69 20 28 2,4 1,6 62 17 25.5 2,25 i.5 67 19 27.5 2 0,7 2 3 4 77 75 74 22,4 22,5 20,5 17 16,5 15 5.75 6 5,5 1 1 1 1 10,25 5.25 5,25 4,6 12 12,3 11,25 3.4 3,5 3,4 2,6 2,6 2,4 12,5 12,3 11,4 3 2,9 2,7 5 4,75 4,4 6,5 6,5 6 36 37 34 9.25 10 8,5 14 14,5 13- 4 4 3,75 i,4 i,4 1.3 61 60 57 16,5 16,5 15 24,5 24,5 23 4,2 4 4 i,4 i.3 i,3 78 79 76 25 25 24 3L5 32 29>5 2,75 2,5 2,5 i,75 i,75 1,5 80 70 26,5 22 32,5 28 2,4 2,25 i,75 i.5 26,5 24 5 I 12 32,5 24 8,75 '5 7 16 4,75 3,5 18,5 4 7,25 9,5 52 14 21 5.5 i.75 N° 1 male, N° 2 — 4 ova-bearing females from Stat. 262; N° 5 female from Stat. 300. General distribution: North of the Kermadec Islands (Bate); off Kandavu, Fiji Islands (Bate) ; Hawaiian Islands (Rathbun) ; Arabian Sea, in the neighbourhood of the Lacca- dives and south-eastwards (Alcock). Superfamily PANDALOIDA. Family Thalassocaridae. Thalassocaris Stimps. This genus, the only one of the family, includes at present four species and one variety. Thalass. Danae Bate, which was taken near the Fiji Islands at the surface, should, as was already suggested by Dr. Balss (Ostasiat. Decapoden, II, 1914, p. 27), be regarded as an immature form, probably of Thalass. lucida (Dana), while Thalass. Stimpsoni Bate seems to be a larval form, probably not pertaining to this genus. All the species are indopacific. Thalass. crinita (Dana), fust recorded from the Sulu Sea, was also taken by the "Siboga" at two Stations of the Sulu Islands, furthermore off Biaru-island, near the north point of Celebes and between Nusa-Besi and the N. E. point of Timor; this species occurs in the Western Indian Ocean and has also been observed at Dzushi, Japan, while a variety was captured by the "Siboga" off the island of Saleyer. Thalass. lucida (Dana) has been found off Assumption Island, one of the Ladrones, west of the Bonin-islands, in the Pacific and near Christmas Island : this species will therefore certainly prove to occur also in the Indian Archipelago. The two other species, Thalass. affinis Borr. and Thalass. maldivensis Borr., are known from the Maldives and Saya de Malha. The species of Thalassocaris are found in shallow water. LIST OF THE SPECIES OF THALASSOCARIS Stimps., KNOWN AT PRESENT 191 8. SPECIES affinis Borr. 19 15 . crinita (Dana) 1852 HABITAT DEPTH IN FATHOMS Maldives Saya de Malha Dzushi, Japan Sulu Sea Tawi-Tawi-islands Anchorage of North-Ubian Anchorage on the east coast of Kajoa-island Biaru-island Between Nusa-Besi and the N.E. point of Timor At various depths down to 26. » V » » » n 71 7 9 — 12 Plankton, surface. 20 — 15 I5 — 30 95 SPECIES HABITAT DEPTII IN 1 ATHOMS Amirante Islands In various depths down to 80. Maldives b r? n Ti » 7) Seychelles •n i) n n n t> Off Saleyer-island Up to 20. Danae Bate 1888 Fiji Islands Surface. lucida (Dana) 1852 Off Assumption Island, Ladrones West of the Bonin Islands Pacific Christmas Island maldivensis Borr. 191 5 . . Maldive Islands. 1. Thalassocaris crinita (Dana). PI. IX, Fig. 22 — 220. Regulus crinitus J. D. Dana, Unit. Stat. Expl. Exp. Crust. 1852, p. 599, PI. 39, Fig. 6a— h. Thalassocaris crinitus H. Balss, Ostasiatische Decapoden II, München, 1914, p. 28. Stat. 93. June 24/25. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu-archipelago. 12 m. Lithotham- nion-bottom, sand and coral. 1 adult male and 1 egg-laden female. Stat. 99. June 28/29/30. 6°/.$ N., I20°2Ó'E. Anchorage of North-Ubian. 16 — 23 m. Litho- thamnion-bottom. 2 ova-bearing females. Stat. 123. North-bay, Biaru-island. 36 — 27 m. Stone and Lithothamnion-bottom. 1 adult male. Stat. 138. August 3. Anchorage on the east coast of Kajoa-island. Plankton, surface. 1 adult and 2 young males. Stat. 282. January 15/17, 1900. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N. E.-point of Timor. 27 — 54 m. Bottom sand, coral and Lithothamnion. 1 adult male, 1 ova-bearing female and 1 young male. The 1 1 well-preserved specimens, 8 of which are adult and full-grown, make it possible to contribute to our knowledge of this apparently rare species. The rostrum, the postrostral carina of which commences nearly on the middle of the carapace, appears in all the specimens a little less high and therefore a little more slender than in Dana's figure 6a ; it is at first rather strongly depressed and in most specimens runs then horizontally forward to the tip, but in those from the Station 282 the distal part is more or less upturned, especially in the ova-bearing female. In this female and in that from Stat. 93 the upper margin is armed with 9 teeth, in all the other specimens, hovvever, with 8, according to Dana the rostrum should be armed dorsally with 9 or 10 teeth; constantly two teeth stand on the carapace behind the orbital margin, the 3rd above or just before the latter. The dorsal teeth slightly increase in size distally, like also the distances between them, so e. g. in the male from Stat. 93 the anterior tooth is as far distant from the apex as from the penultimate and the latter one-fifth farther distant from the foremost as from the antepenultimate, in the male from Stat. 282, however, the distances between the three distal teeth and that between the foremost tooth and the tip are equal. Like in the female, recorded by Balss from Japan (1. c), in all the specimens the rostrum bears ventrally 3 teeth, while Dana describes and figures 2 only; usually the ist or proximal tooth is the smallest, the 2nd the largest of the three, in the female from Stat. 282 the ist and the 3rd are equal and a little smaller than the 2nd; the ventral teeth are placed 96 just below or a little before the three distal teeth of the upper border. The characteristic lateral dilatation of the rostrum agrees with Dana's figure 6ó: it is like a roof, below which the eyes may be concealed. The outer orbital angle is spiniform, acute, but this spine is much smaller than the supra-orbital spine ; between the latter and the orbital margin the carapace bears 5 or 6 transverse winkles. Antennal spine small, obtuse. Antero-inferior angle of carapace rounded. A longitudinal ridge or carina runs near and parallel with the lower border of the carapace. In the adult species the spine of the 3rd abdominal tergum extends to the middle or to just behind the middle of the 4th. Like in Chlorotoats spinicatida de Man the abdominal pleura are spinose in the male, hardly so in the female. In the male the postero-inferior angle of the i st pleuron is produced i n t o a long spine, that is directed backward, while the anterior ano-le is rounded and the lower edge slightly concave; the pleura of the 4 following somites end inferiorly also in a spine, which is smaller than that of the ist; there is a strong spine, finally, at each angle of the posterior border of the 6th somite, which is half as long as the somite itself. In the female the postero-inferior angle of the ist pleuron is obtuse, not spiniform, the lower angle of the 2nd is subacute or even sometimes also obtuse, but those of the 3 following somites terminate inferiorly in a short spine like in the male and the 6th somite is, like in the latter, armed with two strong spines posteriorly. Dana's figure 6a represents probably a female without eggs, but it is no doubt inaccurate, for there is 110 spine at the postero- inferior angle of the 6th somite and the postero-inferior angle of the ist pleuron appears acute. Telson flattened above, with 3 pairs of small dorso-lateral spinules at subequal distances from one another and two pairs of spinules at the tip. Outer uropods as long as the inner and nearly as long as the telson. Cornea larger than the rest of the eyestalk, a small black ocellus seems to be present, though entirely surrounded by the cornea. Antennular peduncle reaching to the middle of the rostrum, 2nd and 3rd joint small, subequal, stylocerite acuminate, reaching almost to the middle of 3rd article or to the distal extremity of 2nd; flagella of equal length, in the male one and a half, in the female just as long as the carapace, without the rostrum, proximal fifth (third) of outer flagellum thickened. Spine at the outer lower angle of 2nd joint of antennal peduncle reaching to the middle of the eyes, when the stalks are stretched forward, somewhat compressed dorso-ventrally, slightly contorted and acute; peduncle stout, almost as long as that of the upper antennae, flagellum 2 7,,-times as long as carapace and rostrum combined. Scaphocerite as long as or a trifle longer than the rostrum, acute tip slightly curved inward; the three teeth on the outer margin gradually increase in size distally, between the teeth and for a short way before the anterior the outer margin appears obtusely crenulate in adult specimens, less distinctly so in younger ones. Mandibular palp 3-jointed, 2nd joint transversely oval, broader than long and shorter than the ist and the 3rd, the arched margins setiferous; 3rd joint as long as ist, twice as long as 2nd, a little more than twice as long as broad, fringed with long setae at the rounded tip and the (inner?) margin. Molar process cylindrical, the truncate, yellow brown coloured tip with 3 or 4 obtuse lobes; distal edge of incisor process 6-dentate, the teeth acute, the four inner of equal size and half as long as the two at the angles. 97 The is' maxilla (Fig. 2 2Ar) has no doubt been damaged by the operation, because there is only one endite: this endite, somewhat longer than broad, is fringed with spines and feathered setae, except on that part of the margin which is situated near the palp; the truncate tip of the palp bears a feathered seta at that angle which is situated opposite the endite. Of the two inner distal lobes (Fig. 22 h) of the 2nd maxilla, that project considerably beyond the basal lobe, the rounded anterior is one and a half as long as the posterior and the narrow fissure between them does not extend to the inner margin, so that the two lobes coalesce on their internal half. Posterior lobe of scaphognathite rounded. The endopodite of the ist maxilliped (Fig. 22/, 22/') bears a small obtuse lobe at the base at the inner sicle, like in Thalass. lucida (Dana) as figured by Dr. Ortmaxn (Zoolog. Jahrb. Bd. V, Abth. f. Syst. 1S90, Taf. XXXVII, fig. 1^); basipodite separated by a suture from the coxopodite, epipodite well developed like in the genus Pandalus. Second maxilliped (Fig. 22 k) resembling that of Thalass. lucida, terminal joint applied as a strip to the end of the óth, one and a half as broad as long. The terminal joint of the external maxillipeds that almost extend to the tip of the antennal scale, is 4-times as long as the penultimate and gradually tapers to the tip, while the borders are clothed with spines and setae; the outer margin of the antepenultimate joint is emarginate and runs therefore like a S. The exopodite reaches to the middle of the penultimate joint. The oral appendages, here described, are those of the left side and taken from the adult male collected at Stat. 28 2. The peraeopods of the ist pair reach in the adult male to the middle of the terminal joint of the external maxillipeds. Ischium only l/n longer than merus, the latter one-fourth broader than ischium, both joints fringed with setae along their inner margin, a few also on the outer. Carpus five-eighths of the merus, with a transverse row of 5 or 6 short spines on the inner half of the distal border that articulates with the propodus, and clothed with long setae on the inner and distal margin, a few also on the outer; terminal joint (propodus) one and a half as long as the carpus, tapering, acuminate and slightly curved, 5-times as long as thick near the base, and armed with spines and setae ; a minute chela at the extremity does not exist. The peraeopods of the 2nd pair reach to the tip of the antennal* scale. Ischium 3-times as long as broad; upper border a little curved, convex-, lower border straight, though uneven, and bearing in the middle two or three spiniform juxtaposed setae, while both margins show a few prominences, near each of which a short seta is implanted. The merus which is as long as the ischium but a little less broad, has an uncouth shape; the lower border namely is hollowed out and concave, for embracing the carpus and the chela, which the animal uses to bear drawn back like in some species of the genus Athanas Leach ; the obtuse prominences on both margins are larger than those of the ischium and on each prominence a short seta is implanted. Carpus conical, a little more than half as long as the merus and a little more than one and a half as long as thick; the upper border bears a small obtuse tubercle, tipped with a seta, near the meral articulation, from which it is separated by a notch. The carpus is flattened above. Chela compressed, 21/3-times as long as the carpus and 21/.1-times as long as broad, hngers half as long as the palm. The immobile finger is armed near the base with a large, SIROGA-EXPED1TIE XXXIXfl3. Ij 98 subacute tooth, the margins of which are curved and with a transverse row of sètae on either side and which tooth is a little broader than high ; this finger bears moreover a lower prominence distally. Dactylus with a rounded tooth in the middle, smaller than the basal tooth of the other fineer, and with a lower, also rounded prominence beyond it; terminal claws of the fingers conical, crossing one another. While the fingers bear several tufts of setae, the palm is nearly smooth and glabrous. The peraeopods of the 3ld pair (Fig. 22111, 2211, 220) show a remarkable character, which was still unknown, namely the fact that the dactyli have a different form in the male and in the female, a sexual dimorphism therefore. The legs of the 3rd pair reach in the male to the tip of the rostrum; the merus is about one and a half as long as the ischium, 6-times as long as broad and armed on the distal half of its lower border with t h r e e conical, stout and subequal teeth, the first in the middle of the margin, the 3rd, near the carpal articu- lation, one and a half as far from the 2nd as the 2nd from the first, upper margin of ischium and merus fringed with feathered setae, shorter setae occur also on the lower margin ; carpus 3-times as long as thick distally, almost half as long as the merus, with a strong spine at the distal extremity and a similar one on the middle of the lower margin, here and there moreover setiferous; propodus twice as long as the carpus, a little shorter than the merus, nearly 10-times as long as broad in the middle, both margins armed with spines and setae, while three longer spines occur at the far end; dactylus half as long as the propodus, flattened, compressed, 5-times as long as broad, slightly curved towards the acute tip and narrowing only from about the middle; the upper margin is armed with 6 spines at subequal distances and these spines are about half as long as the dactylus is wide or a little longer, lower margin with 17 or 18 closely-set spines, that are half as long as those of the upper margin. The 3,d legs of the ova-bearing female from Stat. 2S2 agree, excepting the dactylus, with those of the male, but the merus is 5-times and the propodus S-times as long as broad, a difference owing 110 doubt to the somewhat smaller size of this specimen ; the dactylus, like in the male nearly half as long as the propodus, has a more slender form, being 6 or 7-times as long as broad and, o t h e r w i s e than in the male, g r a d u a 1 1 y narrows from the base to the tip ; the terminal claw (stylopodite) is comparatively longer, measuring 1/i — l/r> the whole length of the dactylus (in the male 1/8), the posterior margin has only s i x spinules that gradually increase in length from the ist or proximal to the last, like is also the case with the inter spaces between them, and there are but three spines on the anterior border, that increase in length from the ist at the proximal fourth to the 3rd on the middle of the margin, which is 3-times as long as the ist. The legs of the 4"1 pair much resemble those of the 3rd , both in the male and in the female. The dactyli, however, of the 4th legs of the male, 4, 5-times as long as broad, more gradually narrow from near the base to the extremity, there are only 3 spines on the anterior margin, like in those of the female, the terminal claw is longer, nearly one-fourth the whole length and there are only 9 spinules on the posterior margin, that are not so close-set as in the 3rd leg and that slightly increase in length. The dactyli of the 4th pair of the female resemble those of the 3"1. 99 The merus of the 5lh legs of the male is almost twice as long as the ischium and 5-times as long as broad in the middle ; the lovver margin is armed with 4 spines that are much smaller than those of the 3rd and 4th pair, and implanted along the whole length of the margin, while the lower border of ischium and merus is fringed with long feathered setae. Carpus about half as long as the merus, a little more than 3-times as long as thick, with a comparatively small spine at the far end of the posterior margin, but with no spine on the middle, propodus a little longer than merus, twice as long as the carpus and about 7-times as long as broad; dactylus measuring one-third the length of the propodus, 5-times as long as broad, gradually narrowing, no spinules on the upper margin but with 5 on the lower or posterior, that gradually increase in length like the interspaces between them, terminal claw measuring one-fourth the whole length of the dactylus. Fifth leg of the female resembling that of the male. Ova comparatively large, 0,7 — 0,74 mm. long, 0,44 mm. broad and not very numerous. The adult male from Stat. 138 is 18 mm. long from tip of rostrum to tip of telson, the abdominal pleura are armed with spines like in the preceding specimens and the 2ml pleopod bears a stylamblys and an appendix masculina ; in the two young specimens that are of equal size, 10 mm. long, the pleopod of the 2nd pair has only one appendage, the stylamblys, but they are considered as males, because the abdominal pleura resemble those of the adult male. The rostrum of the adult male is -.^-dentate, of the upper teeth two stand on the carapace, the 3rd immediately before the orbital margin, the teeth increase distinctly in size from the ist to the last and the latter is a little farther distant from the tip than from the penultimate. Teeth of the lower margin like in the preceding specimens. The rostral dilatation appears as long in proportion to the rest of the rostrum as in Dana's figure 6è, but the dilatation is anteriorly only 1,1 mm. broad, less broad than in the other adult specimens, posteriorly, however, 0,9 mm., so that the straight, not concave, lateral margins converge less strongly than in Dana's figure. The spine of the 3rd tergum reaches not yet to the middle of the 4,h. Terminal joint of external maxillipeds only 3-times as long as the penultimate. In the peraeopods of the ist pair the merus is still a trifle longer than the ischium, the carpus measures ri of the merus and the terminal joint is but one-fourth longer than the carpus. The legs of the 2nd pair resemble those of the adult female from Stat. 99 (Fig. 22/). Those of the 3rd and 4lh pair also agree with the male from Stat. 282, the merus of these legs is, however, armed with four teeth, the dactylus of the 3rd pair has only 4 spines on the upper and 14 on the lower margin besides the terminal claw ; the dactylus of the 4th pair, 6-times as long as broad at base, bears only 2 spines on the upper and 9 on the lower margin besides the terminal claw. The merus of the 5th leg bears 3 spines on the lower margin, 2 on the proximal half and one near the distal extremity. Dactylus of last pair 5-times as long as broad, with 7 spines on the lower margin besides the terminal claw. In the two young individuals the rostrum is not yet laterally dilated and the legs show also some slight differences from the adult species : ischium and merus of the 2nd pair are still devoid of spines and prominences and the dactyli of the following legs show a more slender form. IOO The full-grown male is 22,5 mm. long, (rostrum 4,6 mm., carapace 5,5 mm., abdomen 12,4 mm.), the female has the same size. General distribution : Western Indian Ocean (Horrahaile); Sulu Sea (Dana); 1 >zushi, Japan (Balss). ia. Thalassocaris crinita (Dana) var.? PI. X, Fig. 23 — 23 c. Stat. 213. Scpt. 26 — Oct. 26. Saleyer-anchorage and Surroundings, including Pulu Pasi Tanette, near the North point of Saleyer-island. Up to 36 m. Bottom coralreefs, mud and mud with sand. 3 males. These specimens bear such a close resemblance to those of Thalass. crinita (Dana), described above, that they are provisionally regarded as a variety. The largest specimen is about 18 mm. long (rostrum 3,6 mm., carapace 4,1 mm., abdomen 10,5 mm.). Rostrum in a lateral view as in the typical form, but only 7 teeth dorsally, 2 of which, however, stand also on the carapace, and there is also a small tubercle at the base of the ist tooth; lower margin with 3 teeth, the 3rd placed just in front of the anterior tooth of the upper. The upper margin runs downward as far as the anterior tooth, the distal remaining part horizontal. When the carapace, however, is looked at from above, the basal dilatation of the lateral carinae appears much smaller, only 1 mm. broad, in the typical male from Stat. 93, however, which has the same size, the dilatation appears on e and a half as broad, namely 1,5 mm.; the lateral margins converge also less strongly backward than in the typical specimen, for in the latter the width at the base of the dilatation is 1,12 mm., in the male from Stat. 213, however, 0,86 mm. The second specimen agrees with the described one, in the third the rostrum is broken off. For the rest carapace and abdomen fully resemble those of the typical species and even the transverse wrinkles below the supra-orbital spine are distinct. The other differences are the followino-. While the ischium of the 2nd leers aerees with that of the typical form, the merus does 110 1 show the obtuse prominences on its margins and the upper border appears quite straight and misses even the short spiniform setae, which in the typical species stand on the prominences. The carpus is more narrowed proximally and the obtuse tubercle is absent, like also the notch behind it. Thousrh the measurements of the legs of the 3ld pair are typical, the dactyli more resemble those of the female. The dactyli, indeed, here also half as long as the propodi, are about 7-times as long as broad, narrow gradually and end in a stylopodite that measures l/e the whole length of the joint ; the upper margin has no spines, along the posterior 10 spinules occur at subequal distances and the spinules slightly increase in length. Dactyli of the following legs like those of the 3ld pair, those of the 5th pair with 7 spinules on the posterior margin. Family Pandalidae. The family Pandalidae, nowadays represented by a hundred species and a few varieties, includes the following eleven genera: Pandalus Leach, Dichelopandalus Caull., Pandalina IOI Calman, Peripandalus de Man, Pandalopsis (A. M.-Edw.) Bate, Pantomus A. M.-Edw., Plesionika Bate, Parapandalus Borr., Heterocarpus A. M.-Edw., Dorodotes Bate, Chlorotocella Balss and Chlorotocus A. M.-Edw. The species of the genus Paudalus Leach, about 20 in number, though some may prove to be synonyms, are found either north of the tropic of Cancer or south of the tropic of Capricorn and have not vet been observed between the tropics. The majority of the species of this genus are found in the North Atlantic and in the North Pacific, but do not occur in the Mediterranean, while only four are known from the southern hemisphere. The genus Dichelopandalus Caull., which is closely related, includes two species, one in the eastern, the other in the western half of the North Atlantic, the latter, however, has also been observed off Shumagin Bank, Alaska. The only species of Pandalina Calman ranges, in the northeast Atlantic, from the Barents Sea to the Mediterranean. The genus Peripandalus de Man is also represented only by one species, Perip. serratus (A. M.-Edw.) from Upolu, Samoa Islands. The six or seven representatives of the genus Pandalopsis (A. M.-Edw.) Bate, that differs from the other genera by the conspicuous laminar expansion at the inner border of the ischium of the ist pair of legs, are all distributed throughout the North Pacific either on the east or on the west side, except only Pandalopsis aiupla Bate, which was taken by the "Challenger" off Monte Video, but afterwards proved to range also from Washington to Mexico on the west coast of North America. Pantomus parvulus A. M.-Edw. is the only representative of a genus, which is characterized, like the genus Rhynehoeinetes H. M.-Edw., by the rostrum being movably articulated with the carapace : this rare Crustacean is still only known from off the south coast of the Inited States. Except probably this remarkable genus Pantomus and except the genus Peripandalus, the preceding genera do not occur between the tropics, the six remaining, however, are all represented in the tropical seas. It appears superfluous to expatiate on the distribution of these genera, that are all represented in this collection, because in the general introduction to each genus the geographical range of their species will be fully elucidated. Yery interesting are the catches made by the "Siboga" in this family, not only on account of the discovery of three new species and two new varieties, all remarkable, but also on account of the great number of specimens of some species, so that our knowledge of this family has considerably increased. As the result of the investigations chiefly of the "Challenger" and of the "Siboga", we know at present that the Indian Archipelago is inhabited by 10 species and 1 variety of Heterocarpus A. M.-Edw., by 10 (or probably 12) species and 2 varieties of Plesionika Bate, by 2 or 3 species of Parapandalus Borr. and by one species of each of the three genera Dorodotcs Bate, Chlorotocella Balss and Clilorotoeus A. M.-Edw. K e y to the genera of Pandalidae. ax Carpus of 2,ul pair of thoracic legs multiarticulate, the number of articulations more than three. bx Excepting a postrostral crest the carapace is smooth. fj Rostrum immovable. Oft" the coast of Tripolis Cyclades 160—371 Sagami Bay, Japan Enoshima, Japan 43 longipes (A. M.-Edw.) 1SS1 Near Barbados, Antilles 204 longipes (A. M.-Edw.) var. indica de Man 1917 Near the Kei-islands 170 New Britain Cape Natal 185 martia (A. M.-Edw.) 18S3 East Atlantic 21S — 655 West and Southwest of Ireland 221 — 627 Gulf of Gascony 21S — 273 Spanish coast South of Sardinia 277—359 West of Sicilia 450—415 Messina South of Creta, Cyclades 291 — 480 Lion's Head, South Africa 13' — '36 Arabian Sea 142—400, 430 ■ Bay of Bengal 224 — 284 Andaman Sea 194, 188—220, 271, 405 Tasman Sea 800 Hawaiian Islands 165— 6S4 Sagami Bay, Japan 437 martia (A. M.-Edw.) var. semilaevis Bate 1888 Between the Philippine Islands and Borneo 250 Bali Sea 15S, 285, 294 Oft" Makassar 246 Sulu Sea 246 Between Ceram and New Guinea 310 1) Acconling lo Til. ADENSAMER in: Denkschr. Kais. Akad. Wiss. Wien, Bd. L\A", 1S9S, p. 624, Pandalus sagittarius A. M.-Edw. 1SS3 and Pandalus longicarpits A. M.-Edw. 18S3 (Kecueil Crust. Nouv. PI. 23 and 25) should be identical with this species. io- SPECIES HABITAT DEPTH IN FATHOMS Kei-islands 306 Off the island of Rotti 284 Lobetobi Strait '35 North coast of Sumbawa 150 Off Matuku, Fiji Islands 3'5 Off the Kermadec Islands 520 Off Sydney Harbour 1200 ') ocellus (Bate) iSSS Near Samboangan, Philippine Islands Andaman Sea 82 173 2) Hawaiian Islands 45— 230 2) ocellus (Bate) var. subtiiirostris Riggio 1906 Mediterranean Ortmanni Dofl. 1902 South coast of Japan 27 — 164 Bali Sea 55 Parfaiti (A. M.-Edw.) 1883 3) Expedition of the "Travailleur" in 1882 738 quadridentata (A. M.-Edw.) 1883 3) ... Expedition of the "Travailleur" in 1882 218 Off the Kei Islands 140 Hawaiian Islands 235— 22S, 347—264, 64 — 60 Sulu Sea 150 West of Kei-islands 166 Hawaiian Islands 55-684 Port Otway, Messier Channel 45 tenuipes (S. I. Smith) 18S1 Off the south coast of New England 100 — 252 tcnuipes (A. M.-Edw.) 1SS3 ;') Newport 142 North of New Guinea 150 Bali Sea 158 West of Kei-islands 166 Andaman Sea 172—303 Off Barra Grande, Brazil 350 Parapandalus Bon-. 1899. Adensameri Balss 19 14 Cottei [Pfeffer] (Kotte) 1903 escatilis (Stimps.) 1860 'Off Madeira longicauda (Rathb.) 1901 ! Porto Rico Gulf of Mexico miles A. M.-Edw. 18S3 . Martinique Narwal (Heller) 1863 *) j Mediterranean Red Sea Off the Suaheli coast (Gcrman East Africa) 440—715 345 220 — 225 88 200 87. 371 1) This locality and depth are doubtful: Sl'ENCE Bate, indeed, (Report Challenger Macrura, p. 644) says that two specimens were collected off Sydney Harbour, at a depth of 1200, associated with Nothoearis rostricrescentis\ the latter species, however, was captured off the Kei-islands, at 140 fathoms, in one specimen only (p. 654). 2) These two localities are doubtful. The species from the Andaman Sea, described by ALCOCK as Plesion. ocellus, should probably be referred to Plesion. Sindoi Rathb. and the species from the Hawaiian Islands, described under the same name by Miss Rathbun, seems also to belong to another form. 3) It is doubtful whether these three species must be referred to this genus or to another, because nothing is known about the epipodites of the thoracic legs. 4) The Pandalus narwal of H. Milne-Edwards (Hist. Nat. Crust. T. II, 1837, p. 385) is not this species, but identical with r. fristis (Risso). because the rostrum is said to be "fineinent dentelé en dessus dans toute sa longueur" and because the legs of the ist pair are described as much longer than the antennal scale, which is not the case in /'. Narwal, as described by Heller. io8 SPECIES HABITAT DEPTH IN l-ATHOMS pristis (Risso) 1816 Richardi (Cout.) 1905 . . serratifrons Borr. 1S99 ') spinipes (Bate) 1S8S. stylopus (A. M.-Edw.) 1883 Zur Str assem Balss 19 14 . Mediterranean Adriatic Red Sea West of Madeira New Britain Lobetobi Strait North coast of Sumbawa Off Cape Comorin West of Kei-islands Near the Kermadec Islands North of New Guinea Kagoshima, Japan Sagami Bay, Japan Expedition of the "Travailleur" in 1882 East of Seychelles Southwest of Sumatra Manipa-strait Midway between the islands of Celebes and Buru South of Ambon West of Banda Island o — 1 10 186 — 500 50 — 100 '35 150 '43 1 1 1 150 60 — 1 64 290 0—1093 o — 1310 From S40 to surface Erom a depth of 1093 to surface From a depth of 546 to surface reflexus Bate 1888 parvulus A. M.-Edw. 1S83 Dorodotes Bate 1888. Near Banda Island Banda Sea Philippine Islands Bay of Bengal Pantomus A. M.-Edw. 1883. . . I Gulf of Mexico, in: Lat. 280 13' N., long. S90 10' W. 1425 1530 1050 1300, 13 10, 1439,1644 34 affinis Faxon 189: affinis Borr. 191 5 . . . Alexandri A. M.-Edw. Alphonsi Bate 18S8. 1883. Heterocarpus A. M.-Edw. 1881. Off Acapulco Near Las Tres Marias Saya de Malha Havannah Off Martinique Hawaiian Islands South of the Philippines Off Japan Arabian Sea Bay of Bengal Andaman Sea Cape Natal 660 676- 6S0 300 — 500 805 1030 S 1 1 —67 1 500 345 480 — 740 753. 561 490, 500 440 1) With this species Parap. tenuipes Borr. from New Britain and from the D'Entrecasteaux Group, British New Guinea, is con- sidered to be identical. 109 SPECIES HABITAT DEPTH IN FATIHAI, carinatus (S. I. Smith) 1882 ') dorsalis Bate 1888 East coast of the United States 178 ensifer A. M.-Edw. 188 1 ensifer A. M.-Edw. var. parvispina de Man l9l7 eibbosiis Bate 1888 Grimaldii A. M.-Edw. & Bouvier 1900, hostilis Faxon 1893 laevigatus Bate 188S laevis A. M.-Edw. 1S83 . . . . lepidus de Man 19 17 longirostris Mac Gilchrist 1905 oryx A. M.-Edw. 1881 signatus Rathb. 1906 Sibogae de Man 19 17 Bali Sea 284, 294, 3S0 Flores Sea 434 East of Rotti 284, 500 Strait of Makassar 395 North of Menado 691—637 Off Banda Island 200 Ceram Sea 455 Entrance of Gulf of Boni 633 Kei-islands 538 Off Barbados Island 218 Off St. Kitts, Antilles 245 Off Montserrat 303 Off Grenada 159 Between the Philippine Islands and Borneo 250 New Britain 100 Hawaiian Islands 31—469 Sagami Bay, Japan 218—328 Bali Sea 284 North of Sulu Island 150 Off the Kei-islands 170 Off Tablas Island 700 Bali Sea 158, 285 Southern entrance of the Strait of Makassar 245 Near the Kei-islands 2:7. 305 Andaman Sea 185, 1S8-220, 194, 19S Bay of Bengal 145—250, 240 Arabian Sea 224 — 284 Azores 710 Gulf of Panama 695 — 1020 Hawaiian Islands 165 — 632 Off Banda Island 200 Flores Sea 2/3 Arabian Sea 430, 457—589 East London, Cape Colony 408 Martinique 169 Off Cayman Brac Island, South of Cuba 297 Flores Sea 273 Kei-islands 305 Bay of Bengal 960 Gulf of Mexico 955 Hawaiian Islands 382—253 Bali Sea 158, 284, 294 Southern entrance of the Strait of Makassar 245 North of Batjan 217 West of Saleyer 252 Kei-islands 217) 305 Andaman Sea 188 — 220 Xouv. 1) According to ALCOCK in: Descript. Catal. Indian Deep-Sea Crust. 1901, p. 107 and A. Milne-Edwaros in: Recueil Crust. 1883, Plate 27, perhaps identical with Heteroc. ensifer X. M.-Edw. I IO SPECIES HABITAT DEPTH IN FATHOMS tricarinatus Alcock & Anderson 1894. unicarinatus Borr. 1915 . . vicarius Faxon 1S93 . . . . Wood-Masoni Alcock 1901 levicarina (Bate) 1888 gracilis Balss 19 14 crassicornïs (A. Costa) 1871 East London, Cape Colony Arabian Sea South of Muna Island Entrance of the Gulf of Boni Providence Island Gulf of Panama Andaman Sea Madura Strait Bali Sea Off Makassar Near the Kei-islands Heterocarpoides de Man 1917. Arafura Sea, near Torres Strait Between the islands of Misool and Salavvatti Lobetobi Strait Saleh-Bay Bay of Bima Gulf of Martaban Southern part of the Red Sea Chlorotocella Balss 1914. Sagami Bay Dzushi, Japan Enoshima Between Misool and Salawatti Batjulmati (Java) Chlorotocus A. M.-Edw. 1882. crassicornis (A. Costa) var. andamanensis Anderson 1899 incertus Bate 1888 Novae- Zealandiae (Borr.) 19 16 spinicauda de Man 1902 Cyclades, Sporades Adriatic Gulf of Naples Off the Ligurian coast Mediterranean ') Cape Point, South Africa Cape Natal Andaman Sea Agulhas Bank, off the Cape of Good Hope Sagami Bay, Japan -) Off North Cape, New Zealand Ternate Madura-bay and other localities in the southern part of Molo-strait Between the islands of Wowoni and Buton 310 865—890 1030 633 637—665 210 — 286 265 1S0 158 245 170, 217 28 i/ 135 150 7—17 116 27 43—71 43 '7 Reef 226, 326 87 l8l — 202 80 185 185 150 70 3O—5O 41 — 51 1) This species was dredged by the "Travailleur", 27 July 1SS1, in 181 — 202 fathoms: this took probably place in the Mediter- ranean and not in the Gulf of Gascony, as suggested by Spence Bate (Challenger Macrura. p. 674), because the "Travailleur" has worked in July 1881 in the Mediterranean (A. Milne-Edwares, C. R. Acad. Scienc. Paris, T. 93, 1S81, p. 931) and was fishing in the Gulf of Gascony only three weeks later, August 1 7 th. 2) A specimen from this locality wa> referred by Dr. Bai.ss with some doubt to this species. 1 1 1 Plesionika Bate. The srenus Plesionika Bate, with which the genus Nothocaris Bate is united and which contains at present nearly 30 species ]) and 3 varieties, is represented in the "Siboga" collections by eight species, of which only three were already known to occur in the Indian Archipelago: Pies. martia (A. M.-Edw.) var. semilaevis Bate, unidens Bate and binoculiis Bate. The catch made by the "Siboga" proved to be very interesting. The two largest representatives of this genus are Pies. martia (A. M.-Edw.) and Pies. longipes (A. M.-Edw.), which both attain a length of 190 mm. Of the former the variety semilaevis, described by Spence Bate as a proper species, was collected at ten different Stations in no less than 400 specimens, of the latter, Pies. longipes (A. M.-Edw.), a form discovered by the "Blake" in 18S1 in the West-Indies but since that year never taken again, no less than nine well-preserved adult specimens were captnred near the Kei-islands, which, however, seem to belong to a distinct variety. The five specimens of Pies. binoculiis (Bate), collected by this expedition, are full-grown, twice as large as those that were taken by the "Challenger" ; one of the eight species, finally, proved to be new to science. Five species are found in the Mediterranean besides a variety subtilirostris Riggio of the indian Pies. ocellus (Bate). Pies. capreensis Lo Bianco, the smallest species of this genus excepting Pies. spiniserrata (Bate), occurs off the island of Capri, the four others are Pies. heteroearpus (A. Costa) and Gigliolii (Senna), that are both confined to the Mediterranean, furthermore Pies. martia (A. M.-Edw.) and geniculata (A. M.-Edw.), that are more widely distributed. Pies. martia, indeed, occurs also in the east Atlantic, west and southwest of Ireland, in the Gulf of Gascony and along the spanish coast, but it has also been observed of Lion's Head, South Africa, in the Arabian Sea, the Bay of Bengal, the Andaman Sea, in Sagami Bay, Japan, near the Hawaiian Islands and even in the Tasman Sea! Though this species proves thus to be very widely distributed, its range is not cosmopolitan, for it is not yet known from the western Atlantic nor from the west coast of the New World. Pies. geniculata (A. M.-Edw.) was taken by the "Travailleur", Julv ic/h 1882, but a list of the Stations of this expedition has never been published as far as I know; this species was afterwards obtained by the "Challenger" off Pernambuco, Brazil. Besides this species also Pies. Parfaiti (A. M.-Edw.) and Pies. qnadri- deutata (A. M.-Edw.) were discovered by the "Travailleur". Pies. ensis (A. M.-Edw.) occurs in the West-Indies off the islands of Barbados, Martinique and Grenada, but has also been observed in the Andaman Sea and even near the Hawaiian Islands, being almost as widely distributed as Pies. martia. Pies. acanthonotus (S. I. Smith) and Pies. teuuipes (S. I. Smith) represent this genus on the east coast of the United States, both are species of rather small size. In a rare work published by A. Milne-Edwards in 1883, entitled : "Recueil de Figures de Crustacés nouveaux on peu connus", a Pandalus teuuipes 1) Including two species. Pandalus quadridentatus A. M.-Edw. and Pand. Parfait! A. M.-Edw., obtained by the "Travailleur" in the summer of 1882, and Pand. teuuipes A. M.-Edw., of which it is doubtful whether they belong to this genus or to another, because it is not known whether they have epipods on the thoracic legs or not, while Pa//./, tenuipes A. M.-Edw. (Recueil de Figures de Crust. Xouv. 18S3, pi. 24) seems to differ from Smith's tenuipes^ which is a tiue Plesionika. Of Pa//J. exiguus Rathb. and Pand. spini Rathb. it is likewise still unknown whether they bear epipods or not, but these forms no doubt belong to Plesionika, because Pies. rostricrescentis (Bate) and Pies. bifurca Alcock & Anderson are said to be respectively the nearest related species. I 1 2 from Newport was figured on Plate 24, which seems to differ from S. I. Smith's tcnuipes by the different toothing of the upper margin of the rostrum. The second form, known from the coast of Brazil, is Pies. vniproducta Bate: the western Atlantic proves thus to be inhabited only by 5 or 6 species. Pies. spiniserrata (Bate) is the only form recorded from the coast of South Chili : excepting this species no representatives of this genus are known to occur on the west coast of America. The majority of the species, however, are found in the Indopacific. Besicles the variety semilaevis "f the widely distributed Pies. martin (A. M.-Edw.) and the new variety indica ot the west-indian Pies. longipes (A. M.-Edw.), already mentioned above, nine species are at present known to occur in the Indian Archipelago. Pies. brev ir osiris Bate is still only known from between the Philippine Islands and Borneo, Pies. Ortmanni Doft1., first recorded from Japan, was captured by the "Siboga" in the Bali Sea, Pies. Sindoi (Rathb.) was taken in the Sulu Sea anci west of the Kei-islands, Pies. unidens Bate, distinguished from all the other species by the compressed tooth on the midclle of the 3rd abdominal tergum, is known from the Bali Sea and from near the Kei-islands, near the latter locality occurs also Pies. rostricrescentis (Bate), a rare form of which only one specimen is known ; the four other species, inhabiting the Archipelago, are the new Pies. assimilis, obtained in Madura-bay and other localities in the southern part of Molo-strait, Pies. binoculus (Bate) known from the strait between the islands of Rotti and Timor, from the strait between the islands of Flores and Solor and from the Arafura Sea, Pies. ocellus (Bate), taken near Samboangan, Philippine Islands, but of which it is still doubtful, whether it occurs also in the Andaman Sea and near the Hawaiian Islands and, finally, Pies. bifurca Alcock & Anderson, which has been captured at several localities of the Archipelago. The seas of New Britain and north of New Guinea are inhabited by Pies. longi- rostris (Borr.) and Pies. unidens Bate. Several species have been observed near the Hawaiian Islands, three of them, Pies. brevis (Rathbun), exigua (Rathbun) and spinidorsalis (Rathb.) have not yet been found elsewhere; the rest are Pies. ensis (A. M.-Edw.), mar/ia (A. M.-Edw.), Sindoi (Rathb.) and a form that was referred by Miss Rathbun with some doubt to Pies. ocellus (Bate). Besides Pies. martia (A. M.-Edw.) and Ortmanui Dofl. still a third species is recorded from the seas of Japan, viz. Pies. hypanodon Dofl., a form closely relatecl to Pies. brevis (Rathb.) from Hawaii. Off Cape Natal, South Africa, Pies. longirostris (Borr.) has been taken and in the western Indian Ocean Pies. gracilis Borr., from the seas, finally, around the coasts of India Pies. bifurca Alcock & Anderson, ensis (A. M.-Edw.), martia (A. M.-Edw.) and unidens Bate are known, furthermore Pies. Alcocki A. R. S. Anderson, a form not yet observed elsewhere, and at last a species, that probably must be referred to the Hawaiian Pies. Sindoi Rathb. As regards the vertical range it must be remarked that the species of the genus Plesionika usually occur in moderate depths or even in shallow water. The majority of the species, nearly two-thirds of the whole number known, were captured in less than 400 fathoms, while only four are recorded from a greater depth than 700 fathoms. These four species are Pies. martia (A. M.-Edw.), a large series of which was obtained by the "Woy Woy", October 1906, in the Tasman Sea when the trawl was lowered in 800 fathoms, but this species 1 1 lias usually been observed in less deep water, so e. g. off Lion's Head, South Africa, in 131 to 136 fathoms, Pies. Parfait i (A. M.-Edw.) and Pies. geniculata (A. M.-Edw.) dredged by the "Travailleur" at a depth of 73S fathoms and, finally, the little Pies. capreensis Lo Bianco, which was taken in 1260 fathoms near the island of Capri. Key to the indopacific species of the genus / 'lesioniéa Bate. al The legs of the 2nd pair are of equal or nearly equal length. ^ Rostrum longer than antennal scale (in one species, Pies. brevirostris Bate, in which the rostrum is about as long as the scaphocerite, the lovver border is smooth, while the upper is smooth beyond the basal joint of antennular peduncle). cx The dorsal border of the rostrum, beyond the tip of the antennular peduncle, is quite smooth. dx Lower margin of the rostrum dentate. X Third abdominal tergum compressed and carinated in the middl< . the carina ending abruptly, like a tooth, at the posterior fourth. Rostrum more than twice as long as the carapace, upper border with a solitary tooth a little behind the apex besides 6 or 7 teeth at the base unidens Bate bt No carinate tooth on the middle of third abdominal tergum. c\ Ocellus distinct. Rostrum conspicuously longer than antennal scale. dx Abdomen at the utmost three times as long as the carapace. el Carpus of the legs of the 3ld pair shorter than the propodus. ƒ, Dactylus of the three posterior legs very short, measuring one-fifth of the propodi. A more or less long part of the upper margin of the rostrum, beyond the tip of the antennular peduncle, is smooth, unarmed. gx Stylocerite reaching to the distal extremity of antennular peduncle. Rostrum crescent-shaped. Ocellus circular . rostricrescentis Bate (C. SrENCE Bate, Report Challenger Macrura, 1888, p. 653, PI. CXIV, fig. 1). g3 Stylocerite reaching to the middle of the 2nd joint of anten- nular peduncle. Rostrum at first very little depressed, nearly horizontal, but from the 2nd joint of antennular peduncle strongly curved upward. Ocellus elliptical . assimilis de Man f„ Dactylus of the three posterior legs long, measuring one- third of the propodi. Teeth of the upper margin of the rostrum proper placed at subequal distances, leaving no long smooth interspace between them lünociilus (Bate) e2 Carpus of the legs of the 3rd pair much longer than the propodus ocellus (Bate) (C. SrENCE Bate, Report Challenger Macrura, 1888, p. 657, PI. CXIV, fig. 3). ds Abdomen nearly four times as long as the carapace. Rostrum bent strongly downward in front of eyes, terminal half ascending. Transverse diameter of eyes not exceeding axial. A species of small size, Iength of carapace 4,3 mm. exigua (Rathb.) (M. J. RATHBUN, in: U.S. Fish Commission Bulletin for 1903, Wash. 1906, Part III, p. 916, PI. XXI, fig. 2). l\ No ocellus. Rostrum either a little shorter or but little longer than the antennal scale. rfx Of the 6 to 9 teeth of the upper border of the rostrum four, rarely three, stand on the carapace behind the orbital margin bifurca Alcock & Anderson d„ Of the 1 3 teeth of the upper border of the rostrum seven to nine stand on the carapace behind the orbital margin spiiiidorsalis (Rathb.) (M. J. RATHBUN, in: U.S. Fish Commission Bulletin for 1903, Wash. 1906, Part III, p. 917, PI. XXI, fig. 5). n6 i. Plesionika martia (A. M.-Edw.) var. semilaevis Bate. PI. X, Fig. 24 — 24^. Pandalus martius A. Milne-Edwards, Recueil de Figures de Crustacés nouveaux ou peu connus, Avril 1S83, PI. 2i. Plesionika Martia M. Caullery, Campagne du "Caudan", Paris 1896, p. 378, pi. XV, fig. 1 — 6. Pandalus Martius Th. Adensamer, in: Denkschr. Kais. Akad. Wiss. Bd. LXV, Wien 1898, p. 624. Pandalus (Plesionika) martius A. Alcock, Catal. Indian Deep-Sea Crustacea, 1901, p. 95. Pandalus martius A. Senna, Buil. Soc. Entomol. Ital. XXXIV, 1903, p. 308, Tav. XIV, fig. 6—13, Tav. XV, fig. 1—4. Pandalus martius M. J. Rathbun, in: U.S. Fish Commission Bulletin for 1903, Part III, Wash. 1906, p. 914. Pandalus (Plesionika) martius A. R. Mc Culloch, in: Records of the Australian Museum, Vol. VI, Part 5, 1907, p. 355. Pandalus (Plesionika') martius R. E. Lloyd, in: Records Indian Museum, Vol. I, Pt. 1, Cal- cutta 1907, p. 4. Plesionika martia Stanley \V. Kemp, in: "Fisheries, Ireland, Sci. Invest.", 190S, I. [1910], Dublin, p. 93, PI. XII, figs. 1—4. Plesionika martia Th. R. R. Stebbing, in: Annals South African Museum, Vol. VI, London, 1910, p. 392. Plesionika martia H. Balss, Ostasiatische Decapoden, II, München 19 14, p. 30. Plesionika semilaevis C. Spence Bate, Report Challenger Macrura, 18S8, p. 644, PI. CXIII, fig. 3. Stat. 12. March 14. 7°i5'S., H5°i5'.6E. Bali Sea. 289 m. Bottom mud and broken shells. 83 specimens of medium size, viz. 41 males and 42 females, all but 5 ova-bearing. Stat. 38. April 1. 7°35'.4S., ii7°28'.6E. Bali Sea. 521 m. Bottom coral. 6 specimens of medium size, viz. 3 males and 3 ova-bearing females. Stat. 74. June 8. 5°3-5S., H9°o'E. Off Makassar. 450 m. Bottom Globigerina ooze. 4 speci- mens of medium size, viz. 2 males and 2 females, one of which vvith eggs, and 1 very young specimen. Stat. 100. June 29. 6°li'N., I20°37'.5E. Sulu Sea. 450 m. Bottom dead coral. 1 male of medium size. Stat. 173. Aug. 28. 3° 27'. o S., i3i°o'.5 E. Between Ceram and New Guinea. 567 m. Bottom fine, yellow grey mud. 1 adult, full-grown male. Stat. 262. Dec. 18. 5°S3'.8S., I32°48'.8 E. Kei-islands. 560 m. Bottom solid bluish grey mud, upper layer more liquid and brovvn mud. 1 young female without eggs and 1 still younger specimen. Stat. 297. January 27, 1900. io°39'S., i23°4o'E. Off the island of Rotti. 520 ra. Bottom soft, grey mud with brown upper layer. 1 male of medium size. Stat. 306. Febr. 8, 1900. 8° 27' S., I22°54'.5E. Lobetobi Strait, 247 m. Bottom sandy mud. 96 specimens of small size, among which, however, many are provided with eggs. Stat. 312. Febr. 14, 1900. 8° 19' S., H7°4i'E. Saleh-bay, north coast of Sumbawa. 274 m. Bottom fine, sandy mud. 287 specimens of small size, males and ova-bearing females. Stat. 316. Febr. 19, 1900. 70 19'. 4 S., ii6°49'.5E. Bali Sea. 538 m. Bottom fine, dark brown sandy mud. 6 young females without eggs. Plesionika martia is one of the common shrimps of deep water, it was dredged in plenty in the Andaman Sea (A. Alcock, 1. c.) and Miss Rathbun (1. c.) remarks that over 700 specimens were captured near the Hawaiian Islands in hfty hauls. It is therefore not surprising that almost 400 specimens have been obtained by this expedition, but it is to be regretted that there is only one full-grown specimen in this large collection, the male from Stat. 173, that has a length of 169 mm. from tip of rostrum to end of telson : the specimens from the n7 Stations 12, 38, 74, 100 and 297 are all of medium size, 100 — 125 mm. long, while those that were taken at the Stations 306 and 312 are still considerably smaller, measuring 65 — 80 mm., so that they are even not vet half as long as the male from Stat. 173. The examination of this collection proved in the first place that, like Pies. Ortmaiuii Dofl. (H. Balss, 1. c. p. 31), also Pies. mart ia belongs to those species in which the ova- bearing individu als var; considerably in lengt h, to those in which the reproductive organs are already developed at a tender age, so that the animal is enabled to procreate from that age until its death: not only, indeed, are the ova-bearing females from the above- mentioned Stations of medium size, but the numerous egg-laden specimens from the Stations 306 and 312 are still quite young, being not yet half as long as the full-grown specimen from Stat. 173. While the medium-sized and adult specimens, preserved in alcohol, show all the same uniform straw colour, in the young individuals from the Stations 306 and 3 1 2 the first to third abdominal terga are often marked with a transverse blackish or dark coloured band, though a great number of them are also quite unspotted. The measurements revealed furthermore the fact, already suggested by Stanley Kemp (l.c. p. 95), that in the indian representatives of Pies. martia the rostrum is constantly short er, comparatively, than in the typical species from the Mediterranean and the East Atlantic (see the Tables of measurements) : it is therefore justified to regard the indian form as a variety semilaevis Bate. When the length of the body is measured from the back of the orbit to the tip of the telson, the rostrum varies in ten medium-sized specimens, collected at Stat. 12, from 39 per cent. to 47 per cent. of the length of the body, according to Senna's measurements (1. c.) in seven specimens from the Mediterranean, however, from 45 to 58 and according to those of Stanley Kemp in eleven full-grown and medium-sized specimens from the coasts of Ireland from 51 to 67. In the full-grown male from Stat. 173 the ratio of rostrum to body (100) is even only 34. When the rostrum is included, its proportion to body proved to be only 25 per cent. of the length of the latter in the adult male from Stat. 173, while it varied from 28 to 32 in the ten medium-sized specimens from Stat. 12, in the eleven adult or medium-sized specimens, mentioned by Kemp, this proportion, however, varied between 34 and 40 and in 5 medium- sized specimens from the Mediterranean between 32 to 37 (Senna, 1. c). Like in most species, also in Pies. martia the rostrum appears comparatively longer in younger specimens, which fact is also proved by the Table: the measurements of these younger specimens are therefore not comparable with those of Senna or Kemp, whose specimens were adult or of medium size. Unnecessary to remark that the relative length of the rostrum varies also rather much in the numerous specimens of this collection. In the adult male, long 169 mm., from Stat. 173 the rostrum is only one-third longer than the carapace, in the specimens of medium size the proportion between the length of the rostrum and the carapace varies from 1,6 t o 2,2 and in the young specimens from the Stations 306 and 312 from 2,2 to 2,9, the rostrum appearing in the latter sometimes almost 3-times as long as the carapace: these numbers prove again that with advancing age the rostrum becomes relatively shorter. According to Stanley Kemp (1. c. p. 94) the rostrum is armed dorsally in the typical i iS species with from five to ten teeth, usually eight or nine, in a specimen from Lion's Head, South Africa (Stebbing, 1. c.) eight teeth stood on the upper border of the rostrum and according to Col. Alcock in the species from the coasts of India the rostrum is also armed with from five to eight - - usually eight — teeth. In the variety semilaevis Bate the usual number of dorsal teeth on the rostrum of medium-sized specimens proved to be si.x, less usually se ven, while eight teeth were rarely observed: among 66 medium-sized specimens the rostrum was armed dorsally in 35 with six, in 21 with seven, in 6 with eight and in 4 with five teeth. In the full-grown male from Stat. 173 there were also eight teeth, but this belongs no doubt to the exceptions. Usually in specimens of medium size the two first teeth stand on the carapace behind the orbit, more rarely t h r e e are observed : among the 66 specimens in 48 two teeth stood on the carapace, in 1 6 three and in 2 four, a great exception indeed. These two or three teeth that stand on the carapace, are almost constantly considerably smaller than the following. In the young specimens from the Stations 306 and 312 the usual number of teeth on the dorsal side of the rostrum proved to be seven, more rarely six or eight, while in an ova- bearing female, the carapace of which was 9111111. long, nine dorsal teeth stood on the latter : among 34 specimens from these Stations in 21 seven teeth were observed, in 5 six, in 7 eight and in 1 nine. In these specimens the anterior tooth stands usually a little before the distal extremity of the antennular peduncle to near the tip of the antennal scales, which fact does never occur in the older specimens; in these younger individuals more often three teeth are placed on the carapace than in the larger ones, among the 34 examined in 1 S three, in 1 5 two teeth were observed, while in an ova-bearing female, in which the carapace and the rostrum were respectively 9,25 mm. and 24 mm. long, four teeth were placed on the carapace. The rostrum is continued backwards as a blunt carina, which in the adult male evanesces a little behind the middle of the carapace; posterior to the carina one observes, like in other species, in the mid-dorsal line a very small tubercle, situated about twice as far from the carina as from the hind margin of the carapace and in old individuals, like in the male from Stat. 173, the cardiac region appears moreover a little uneven. The branchiocardiac groove is rather deep and runs obliquely in the direction of the angle betvveen the straight dorsal and the curved lateral part of the posterior margin of the carapace, but it does not reach this margin and in the adult male extends even not as far backwards as the median tubercle on the cardiac region. It is of course erroneous when Caullerv (1. c.) remarks "Ie céphalothorax ne présente pas de carène". The orbital spine is well-developed and extends in the adult male as far forward as the 2nd joint of the antennal peduncle, while the branchiostegal spine, that is directed obliquely downvvard, is much smaller and shorter. In the adult male from Stat. 173 the abdomen, telson included, appears three times as long as the carapace, the former being 94,5 mm. long, the carapace 32 mm.; the 6th somite is one and a half as long as the 5th, the telson is broken at the tip. In the medium-sized specimens it is as long as the endopodite of the caudal fan or a little longer, though shorter than the exopodite, in the young specimens from the Stations 306 and 3 1 2 the telson is usually even a little shorter than the endopodite. Only in a comparatively small number of specimens one or more of the three posterior ii9 legs are completely preserved, while in the rest these legs are partly or entirely broken off: this is a great pity in connection with the remarkable fact that the measurements of the three posterior legs vary rather co nside rabl y. Stanley Kemp has first observed this variability, for in his valuable work on the Decapoda Natantia of the coasts of Ireland he writes, p. 95: "The exact length of these limbs is by no means constant; the female specimen mentioned above probably represents an extreme case". When we look at the Table of Measurements, in which the exact length of the joints of one or more posterior legs of 2 1 specimens has been recorded, the following observations can be made. The carpus appears nearly equally long in the 3'd, 4th and 5th pair-, it measures in the 3ld pair about three-fifths, in the 4"1 two-thirds and in the 5th about four-fifths of the respective merus and ischium combined. In the adult male from Stat. 173 the propodus of the 3rd legs is little shorter than the carpus, but almost in all the other specimens it is considerably shorter, measuring only one-half to two-thirds the length of the carpus: in the young female from Stat. 262 and in a young male from Stat. 316 the propodus appears a little longer than the carpus! In the figure of Pies. martin in A. Milne-Edwards' "Recueil" the three posterior legs are no doubt incorrectly figured, because the propodus of the 5"1 leg appears shorter than that of the 3rd, which certainly never takes place. In the figure of this species, published by Senna (1. c), the carpus of the 3rd pair appears slightly shorter than the propodus, like in the adult male from Stat. 173, in Kemp's figure (1. c. PI. XII) and in the figure of Pies. semilaevis in the Report on the Challenger Macrura (PI. CXIII, fig. 93), both joints show about the same lengtip In the adult male from Stat. 173 the propodus of the 4th pair is nearly one and a half as long as the carpus, almost as in Bate's figure, and in the young male, long 96 mm., from Stat. 3 1 6 even more than t w i c e as long as the carpus, but in the male N° 6 from Stat. 1 2 the propodus is hardly one-third longer than the carpus and in the other specimens the carpus is jus t as long or even a little longer than the propodus. In the figures of Senna and Kemp the propodus of the 4th pair appears almost twice' as long as the carpus. The 5th legs of the young male from Stat. 3 1 6 resemble the figures of the typical species in the papers of Senna and Kemp, the propodus being nearly 21/,-times as long as the carpus; in Bate's figure of semilaevis the propodus appears twice as long as the carpus, such a specimen is the male N° 6 from Stat. 12. In the few other specimens in which these legs were still preserved, the propodus is only one and a half as long as the carpus or little more, in the young specimen N° 20 from Stat. 3 1 2 the propodus is even only one-third longer than the carpus. These variations in the relative length of the joints of these legs do not seem to depend upon the age of the specimens. The specimens N° 6 and N° 21, respectively only 97 mm. and 96 mm. long, nearly agree with Kemp's figure of a full-grown, ovigerous female, while this is not the case with the other specimens, that are longer and thus much older. Unfortunately no mea- surements at all of the three posterior legs are given by the authors which have described or studied this species. New investigations and measurements both of indopacific and east atlantic or mediterranean specimens are therefore necessary in order to decide the question, whether constant differences exist or not between the typical species from the East Atlantic and the variety semilaevis from the indopacific seas, as regards the measurements of these legs. I 20 Table A Number ecimen. I .ength of body, rostrum included. Length of rostrum. Ratio of rostrum to body, when the rostrum is included. Ratio of rostrum to body, when the rostrum is excluded. I "3 34,5 30,5 44 2 1 12 34Ó 30,8 44 3 in. 5 36 32 47 4 1 1 1 32,5 29-3 41 5 125 36 29 41 6 121 38,5 32 47 7 121 37.5 31 45 8 116 32,5 28 39 9 II4.5 34, 5 30 43 IO IOI 30,5 30 43 i i I23 36,5 30 42 12 169 42.5 25 34 '3 72 24,5 34 52 14 70 25 36 55 15 67,5 22,5 33 50 16 67 24 36 56 '7 78 27»5 35 54 18 76,5 29 38 61 19 73 24,5 33 51 20 7i 23.5 33 50 N" 1 — 10 Stat. 1 2 N° 11 Stat. 38; N° 12 Stat. 173; N" 13—20 Stat. . oó. Table B. Length of body, rostrum included I. ength of merus and! &j 1 ^ ischium combined f " I Length of carpus \ Si „ „ propodus | „ „ dactylus ; ^ Length of merus and\ Si ■ ■ • 1 w ischium combined | ~ Length of carpus ; ^f „ „ propodus M „ „ dactylus ] ^ Length of merus and\ So I u ischium combined I ~ I j= Length of carpus , tr> „ „ propodus l ij „ „ dactylus ) ^ I 2 3 4 5 6 7 8 9 10 116 114 "3 1 10 106 97 121 120 119 118 25 27,5 25 25 28 28 27 15 16,3 16 19,5 17 17 '5,5 S,6 8,5 9 10 8,5 9 10 2,9 3 3 2,9 i,9 3 3 21 22,5 21 22,5 24 23 23,5 14,75 15 14 18 16 17,5 16 H,5 14,3 13,5 23 16 14 16 2 2,2 1,8 2,2 2,25 2 2,4 20,5 20,5 19,5 19 24 21,5 15,5 16 15 18,2 18 16 25,5 24,5 24 36,3 2S,5 28,5 i,5 i,75 i,9 2,25 2 I I 12 ■3 '4 15 16 17 18 '9 20 117 169 104 83 74 73 72 68 67 85 1. r. 26,5 26,5 3° 21 '8,5 16 16 18 17,5 15,5 16 io,75 ",75 io,5 1 1 12 8,5 9,5 ■4,5 '3 6,75 6,4 6 7 2,5 3 3,5 i,7 3,2 2,75 ',3 3,2 27 '5 M '3,5 16 16,5 ", 5 10 9,5 ",5 23,2 11 9,5 9,75 11 • 3 • i,75 13 11,25 13 'i,5 16 2,6 2,3 '2,5 10,4 2 2,5 '4 12 16,5 2,8 96 iS II '2,75 ',75 16 1 1 24 '4,5 '2,3 31.5 N° 1 — 11 Stat. 12, N° 1 — 6 males, N° 7 — 11 ova-bearing females; N° 12 male from Stat. 173; N" 13 female from Stat. 262; N° 14 — 19 young specimens from Stat. 306, Nu 14, 15, 18 and 19 ova-bearing-, N" 20 young specimen from Stat. 312; N° 21 young specimen from Stat. 316. I 2 I General distribution: The typical species is known from the East Atlantic (A. Milne-Edwards), from the coasts of Ireland (Stanley Kemp), from the Bay of Biscay (Caulleryi, from the Spanish coast (Wolfenden) and from the Mediterranean (Adensamer, Riggio, Senna). The variety semilaevis Bate was obtained by the " Challenger" between the Philippine Islands and Borneo, off Sydney Harbour, Australia, off the Kermadec Islands and off Matuka, Fiji Islands (Bate and McCulloch). It occurs also at Lion's Head, South Africa (Stebbim, , probably also in Salami Bay, Japan (Balss) and at the Hawaüan Islands (Rathbun). Whether the species, observed by Alcock in the Andaman Sea, in the Bay of Bengal and in the Arabian Sea, belono-s also to the variety, appears doubtful, because, according to the measurements mentioned by this author, the rostrum should be as long as in the typical species. 2. Plesionika longipes (A. M.-Edw.) var. indica cle Man. PI. X and XI, Fig. 25 — 25^. Pandalus longipes A. Milne-Edwards, in: Annal. Scienc. Nat., Zool., (6) XI, 1881, Art. N° 4, p. 15 and in: Recueil de Figures de Crustacés nouveaux 011 peu connus, Avril 1883, PI. 20. Plesionika longipes (A. M.-Edw.) var. indica J. G. de Man, in: Zoolog. Mededeelingen, uit- gegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel III, Afl. 4, Dec. 1917, p. 279. Stat. 254. Dec. 10. 5°4o'S., I32°26'E. Near the Kei-islands. 310 m. Bottom fine, grey mud. 1 male and 8 ova-bearing females. Plesionika longipes (A. M.-Edw.), which was obtained by the expedition of the "Blake" off the island of Barbados, West-Indies, at a depth of 200 fathoms, is only known by the brief description of 1881 and by the figures published by A. Milne-Edwards in the quoted "Recueil": this species has never been found again since its discovery by the "Blake". It is therefore very interesting that Pies. longipes has been trawled by the Siboga expedition near the Kei-islands, so that this fact does remind us of Pies. martia (A. M.-Edw.) and other West- indian forms which show the same geographical distribution. In the specimens, collected by the "Siboga", the number of rostral teeth both on the upper and the lower margin is, however, smaller than in the West-indian typical species, the rostrum is a little shorter, less upturned and the ist tooth of the upper margin stands a little more forward : it is therefore that they are here described as a new variety indica. This species is a true Plesionika, the external maxillipeds namely are furnished with an exopodite, the epipodites are wanting on the last leg only, the posterior lobe of the scaphognathite is broadly rounded and the rostrum is armed dorsally only with fixed teeth. The male is 157 mm. long, the females 164 — 190 mm. from tip of rostrum to end of telson : this variety has thus the same size as the typical species and both belong to the largest representatives of the genus. The Table of1 Measurements shows that the length of the carapace of full-grown specimens varies from $?, to 39 mm.; the carapace appears a little more than one and a half as long as high, the proportion being like 5 : 3. In some specimens the rostrum is almost one and a half as long as the carapace, in one (X" 5) even slightly more, while in other ones the difference of length is much smaller. The postrostral carina rises rather suddenly just in the middle of the carapace as a well-defined, though obtuse crest, which in its posterior SIEOGA-EXPEDITIK XXXIX(!:I. l6 12 2 half is slightly curved, as is also visible in the figure of the "Recueil". The posterior half of the carapace is evenly rounded dorsally. The rostrum (Fig. 25 a) is at first somewhat depressed to a little beyond the antennular peduncle and runs from here straight forward, only slightly ascendant, so that the apex is situated at the sa me level as the curved part of the postrostral crest : in the typical species from Barbados the rostrum is m u c h more u p t u r n e d and t w i c e as long as the carapace. Dorsally the rostrum is armed with 27 — 33 fixed teeth, of which usually the first live, rarely four or six, stand behind the orbital margin; the ist tooth, which is very small, is placed at lL — l/w the length of the carapace from the orbital margin, the following gradually increase in length to about the middle of the proper rostrum, while the remaining teeth that reach to the tip, gradually again diminish in size and therefore appear again more close-set than those in the middle. The lower margin is armed with 22 — 27 teeth, from about the distal extremity of the antennular peduncle to the tip ;' these teeth are smaller than those of the upper border, close-set and diminish also gradually in size. According to the figure in the "Recueil" in the West-indian typical species the upper border should be armed with 50 to 55, the lower with about 70 teeth. Orbital spine small, short, not yet reaching the cornea of the eyepeduncles and not buttressed by a carina; branchiostegal spine smaller than the orbital, directed obliquely downward and projecting less forward than the orbital. An impressed point or pit exists, at one-third the length of the carapace from its anterior margin, at the level of midway between the orbital and the branchiostegal spine. Branchiocardiac groove slightly indicated, for the rest the carapace is smooth. Abdomen little longer than carapace and rostrum combined. On the ist abdominal tergum are more or less distinct traces of four small tubercles, placed transversely and each of which shows an impressed point, the same tubercles which in some species of the genus Heterocarpus are so conspicuous; the two lateral are twice as far distant from one another as the two sub- median ones. Posterior border of 3rd tergum convex, little prominent. Sixth abdominal somite nearly one and a half to almost twice as long as fifth. Telson almost as long as the 5th and 6th somite combined, sometimes slightly longer than the two preceding somites taken together; it is faintly grooved above and armed with 3 pairs of small dorso-lateral spinules besides those at the tip ; sometimes it is as long as the endopodite of the tail-fan and distinctly shorter than the exopodite, sometimes as long as the exopodite, sometimes even a little shorter than the endopodite. Eyestalks of moderate size, cornea large, ocellus quite distinct and almost independent. The antennular peduncle does not reach halfway along the antennal scale, namely along ik of its length, ist joint as long as 2nd and 3rd together, 2nd and 3,d subequal. Stylocerite flattened, acuminate, reaching to the far end of the 2nd joint or just beyond it. Antennular flagella subequal, the inner about one-sixth longer than the body. Spine at the outer lower angle of the 2nd joint of antennal peduncle rather short, stout, compressed, acuminate. Antennal peduncle reaching almost to the middle of the 3'd joint ot antennular peduncle; scale (Fig. 25^) a little longer than two-thirds the length of the carapace, 4-times as long as wide, narrowing a little distally, outer margin slightly convex, terminal spine small, shorter than the blunt extremity of the lamella. Antennal flagellum almost twice as long as the body. In the left mandible (Fig. 25 c) the cutting-edge of the incisor process is armed with six acute teeth, of which the first, at the opposite side of the pal]), is a little larger than the 2nd; the 2nd and four following slightly increase in size, so that tin- 6th, at the same side as the palp, appears as large as the first. The outer margin of the truncate extremity of the molar process bears three obtuse, subequal teeth, while the brown inner margin is entire. In the right mandible (Fig. 25^, 25 c) the incisor process bears four or five teeth, three or four of which are of equal size, while the fourth or fifth, at the side of the palp, is twice as large as the others. The outer margin of the truncate extremity of the molar process bears 6 or 7 blunt teeth oi unequal size, at the inner side one observes a brown coloured, concave portion, the posterior obtuse angle of which is dentiform, while another smaller, obtuse tooth occurs posterior to it. The ist or basal joint of the 3-jointed palp is produced posteriorly and distally into a truncate or obtuse process, 2nd joint slightly shorter than ist, 3rd as long as ist and 2nd taken together, flattenecl, not narrowing but truncate distally and almost 3-times as long as broad. Of the two inner distal lobes of the 2nd maxilla (Fig. 25/), that project far bevond the basal lobe, the anterior is rounded and one and a half as broad as the posterior; posterior lobe of the exopodite rounded. Seventh joint of 2nd maxillipeds (Fig. 25^) applied as a strip to the 6th, nearly three times as broad as long. The external maxillipedes réach, both in the male and in the female, by their terminal joint beyond the antennal scale; terminal joint about 1/6 shorter than the penultimate, that measures two-thirds of the antepenultimate; exopodite half as long as the latter. Unfortunately in the single male the legs are wanting or incomplete. In the female the legs show the following characters and measurements. The legs of the ist pair reach by two- thirds of their carpi beyond the antennal scale; their terminal joints, which at their subacute extremity show no tracé of a microscopical chela, measure one-third of the carpi. The legs of the 2nd pair are very slender, equal and reach by the chela and half the carpus or a little more beyond the antennal scale; terminal joint of the carpus, which is nearly as long as that of the ist pair, almost as long as the three preceding joints combined and one-hfth shorter than the chela; chela 1ju of the carpus, fingers as long as the palm. The three posterior legs are also very long and slender; those of the 3rd pair extend by the three last joints and a small part (about */,,) of the merus beyond the antennal scale, those of the 4th only by the three terminal joints, those of the 5th pair by the two last joints and almost the whole length (9/10) of the carpus. The three legs, however, slightly increase in length from the 3ld to the 5th, though the meri become gradually a little shorter in the same succession, because the carpi and the propodi distinctly increase in length. The dactyli of the 3rd pair measure almost one-third, those of the 4th about one-fifth, those of the 5th one-sixth of the propodi ; the dactyli are flattened, narrow, lanceolate, and nearly straight. As results from the Table the proportions between the joints of these legs vary, however, rather much : so e. g. in N° 2 and X" 8 the propodi of the 5th pair are almost twice as long as those of the 3rd, in X" 3 and X" 6 only one and a half. I 24 Length of rostrum. „ „ carapace „ „ abdomen Entire len"th . . Table A. Measurements in millimeters. I 2 3 4 5 6 7 8 50 45 50 49.5 51 47>5 41 45 37 39 35 35 33 35 37-5 34 103 96 90 90 90 87,5 90.5 85 190 180 i/5 175 174 170 169 164 5 31 6 32 26 5 33 27 4 30 2 2 4 2 8 2 7 5 3 3 2 3 5 ■-' 7 2 5 5 L' 9 2 3 9 42 33 82 157 Rostral formula. . . X° 1 — 8 ova-bearing females, N" 9 male, in which the rostrum is incomplete. Measurements in mi specimens 1 — 3 Length of merus „ „ carpus „ „ propodus „ „ dactylus Length of merus „ » carpus ü propodus „ „ dactylus Length of merus » carpus „ „ propodus „ „ dactylus Table B. i nieters of the three poste rior 1 e g s in 6 and 8 of the preceding Table. of 3'd leg of 4»h leg of 5A leg I 2 3 6 56 53 58,5 53 37 41 43 39 15 16,5 i8,5 '9 4.5 5>3 5 5-5 54 5i 56 52 40,5 47 50 45 22,5 22 24.5 24 4.5 4.5 5 5' 45 55 50 52 45 62 50 30 27 28 • 4,5 4.5 5 8 55 40 16,5 5 53 46 23 4.3 49 48 30 3-8 the Eggs very numerous and small. Geographical dist r ib u ti on : The typical Plesionika longipes (A. M.-Edw.) was taken by the "Blake" off the island of Barbados, West-Indies, at a depth of 200 fathoms. Plesionika Ortmanni Dofl. PI. XI, Fig, 26, 26a. Plesionika ortmanni F. Dofiein, Ostasiatische Dekapoden, München 1902, p. 616, Taf. III, Fig. 2. Plesionika ortmanni H. Balss, Ostasiatische Uecapoden II, München 1914, p. 30, Fig. 14. Stat. 15. March 15. 7°2'.6S., 11 5° 23.6 E. Bali Sea. 100 m. Bottom fine coralsand. and 1 female. male The two specimens are of the same medium size and the female has no eggs. The male is 52 mm. long from apex of rostrum to tip of telson, the rostrum being 17 mm. long, the carapace 8,75 mm., the abdomen 26,25 mm.; in the female the rostrum is broken oft a little behind the tip. The rostrum, which in the male is almost twice as long as the carapace, is first slightly depressed to a little beyond the tip of the antennular peduncle and from here obliquely turned upward, so that the apex is situated above the level of the carapace ; the dorsal crest gradually commences nearly in the middle of the carapace, but the ist tooth is 12: placed not far from the orbital margin, at one-seventh of the distance between the latter and the posterior margin of the carapace. The upper border is armed with i 7 teeth, the three first stand on the carapace and, though slightly increasing in length, are distinctly smaller than the 4th, which is placed above the orbital margin ; the two first are articulated and thus probably movable and this is perhaps also the case with the 3rd ; the 4"1 to 8th tooth are of equal size, placed at equal distances except the Sth which is a little farther distant from the 7th than the preceding and this 8th tooth is placed near the middle of the antennal scale, just in front of the antennular peduncle. The following teeth become gradually smaller, the distance between the 8th and the oth is a little longer than that between the 8th and the 7,h and the distance between the 9th and the ioth is still a little longer, the longest distance of all, but from here the distances become gradually shorter; the foremost tooth stands as far from the tip of the rostrum as from the penultimate. The lower margin bears 10 or perhaps 11 teeth that are much smaller than the _|th — gth tooth of the upper margin; the ist stands between the 8th and Qth of the upper margin, the 2nd nearly midway between the oth and the ioth, the distances between the following oradually diminish in length. The rostrum is narrow and tapers slightly to the tip. The rostrum of the female resembles, as far as it is preserved, that of the male, but the distance between the 8th and the 9th tooth of the upper margin is the longest of all. Antennal spine reaching to the cornea of the forwardly stretched eyestalks, branchiostegal spine very small, much smaller than the other; carapace for the rest quite smooth. Abdomen nearly as long as carapace and rostrum combined, 3-times as long as the carapace; all the abdominal terga, even the telson, are rounded, smooth; posterior margin of 3rd tergum slightly convex, 6th somite (4,5 mm.) of the male almost twice as long as the 5lh (2,5 mm.), telson (6,75 mm.) one and a half as long as 6th somite, a little shorter than the inner, but much shorter than the outer uropod. Cornea as broad nearly as the eyestalk is long, ocellus quite distinct, circular, almost independent, only anteriorly in contact with the cornea. Antennular peduncle short, reaching only along the proximal third part of the antennal scale, 3rd joint a little longer than 2nd; outer flagellum as long as the body, rostrum included, widened proximal part measuring about 1/7 the entire length of the flagellum; inner flao-ellum about four-fifths of the other. Stylocerite acute, as long: as basal antennular article. Antennal scale (7,8 mm.) almost as long as the carapace and almost half as long as the rostrum, in the male; it is narrow, 5-times as long as wide proximally and narrows distinctly anteriorly ; outer margin straight, terminal spine as long as the tip of the blade. Antennal peduncle reaching to the distal extremity of the 2nd joint of the antennular peduncle; flagellum one and a half as long as the entire length from apex of rostrum to tip of telson. The external maxillipeds reach by the terminal joint and one-fifth of the penultimate beyond the antennal scale-, exopodite reaching almost to the middle of the antepenultimate joint. The peraeopods of the ist pair reach by their terminal joint (propodus) beyond the apex of the rostrum, by their terminal joint and the distal third of the carpus beyond the external maxillipeds; carpus twice as long as the terminal joint, which seems to bear a rudimentary chela at the far end, long about l/so of the propodus. 12Ó The peraeopods of the 2'ul pair are equal and slender, those of the male reach by the chela and four-fifths of the carpus beyond the antennal scale, those of the female by the chela and the whole carpus • in the female the ischium extends to the middle of the terminal joint of the antennal peduncle and this is also the case in the male; the carpus is in the male i i mm. long and composed of 33 — 35 joints, that in the middle are longer than anteriorly and posteriorly; the chela measures one-fifth of the carpus and the fingers are one-sixth shorter than the palm, a little gaping and unarmed, while, according to Doflein, the dactylus should be armed with a blunt tooth near the extremity. The 2nd legs of the female resemble those of the male, the fingers are hardly shorter than the palm. Following legs long, slender, gradually diminishing in length ; while in the male the legs of the 3rd pair reach by the dactylus, propodus, carpus and one-fifth of the merus beyond the antennal scale, of the 5"1 pair only the dactylus, propodus and two-thirds of the carpus project beyond it. As results from the following Table, the carpi gradually diminish in length, while the length of the propodi gradually increases from the 3rd to the 5th pair and the dactyli become also shorter. While accordingly the carpus of the 3rd pair is one and a half as long as the propodus, in the 5"1 pair these two joints show nearly the sa me length. The long and slender dactyli are al most straight and quite unarmed, without teeth or spines ; those of the 4th pair measure just one-third of the propodi, the dactyli of the 3rd pair (Fig. 26a) are comparatively a little longer, while those of the«5th pair measure not yet one-fourth of the penultimate joint. Though these legs are long and slender, even the 3ld pair appears, however, still much shorter than the outer flagella of the upper antennae, which, as already remarked, are as long as the body. Like in the allied species the men of the three posterior legs are armed with small spines. Except on the last pair, the epipodites of all the legs are well-developed. According to Dr. Balss this species attains a length of S5 mm. Table of Measu r e men ts in millimeters. Carpus Propodus Dactylus I 2 1 2 1 2 Leg of the 3''1 pair . 12,6 12,3 7.9 8,2 3,1 3,1 Leg of the 4'h pair . IO,3 IO,2 8,4 8,7 2,8 2,7 Leg of the 5'h pair . 9,6 9,8 9-4 9.8 2,05 2 N° 1 male from Stat. 15; N° 2 young specimen of Pies. Ortmanni Üofl., from Misaki, Japan, determined by Dr. Balss and received from him; this specimen had the same size as the two from Stat. 15. 4. Plesionika Sindoi (Rathb.). PI. XI and XII, Fig. 27 — 27^. Pandalus sindoi M. J. Rathbun, in: U.S. Fish Commission Bulletin lor 1903, YVash. 1906, Part III, p. 91 S, PI. XXI, fig. 4. ? Pandalus (Plesionika) ocellus A. Alcock, Descr. Catal. Indian Deep-Sea Crustacea, Calcutta, 1901, p. 98. 127 Stat. 95. June 26. 5°43'.5 N., II9°40'E. Sulu Sea. 522 m. Stony bottom. 1 male. Stat. 105. July 4. 6°8'N., 121° 19' E. Sulu Sea. 27501. Coralbottom. [ adult egg-laden female. Stat. 253. Dec. 10. 5°4cS'.2S., I32°I3'E. West of Kei-islands. 30401. Bottom grey clay, hard aod crumbly. 1 male. Unfortunately in the adult female (Fig. 27) the rostrum is broken offnear the distal extremity of the antennular peduncle. The very lovv dorsal crest commences nearly at the anterior third of the carapace, which, posterior to it, is rounded and which is 10 mm. long; the ist tooth, which is very small and the smallest of all, stands at one-fourth the length of the carapace from its orbital margin, the four following slightly increase in length and are all placed on the carapace: the four first teeth seem to be movable. The 6th tooth is much larger than the carapacial teeth and stands above the orbital margin, the three following are of the same size as the 6th, near the 9th the rostrum is broken off. The carapace of the male (Fig. 27*?) is 7,5 mm. long, the rostrum 10 mm., when measured in a straight line from the orbital margin to the apex, almost one and a half the length of the carapace; from the orbital margin the rostrum runs horizontally forward as far as the distal extremity of the antennular peduncle and from here it is a little and obliquely turned upward; the rostrum is not widened at base and tapers regularly to the pointed apex. Like in the female there are 5 movable teeth on the carapace, closely set, of which the ist is the smallest, the 2nd twice as long as the ist, while the three following slightly increase in length; the 6lh tooth, fixed like the following and placed above the orbital margin, is comparatively smaller than in the full-grown female and but little larger than the 5th movable tooth. The 6th tooth is foliowed by four teeth of equal size, of which the anterior stands near the distal extremity of the antennular peduncle; from here to the apex four smaller teeth occur, that gradually diminish in size anteriorly, while also the distances between these teeth become gradually smaller. The lower margin is armed with 6 teeth, the ist at the far end of the antennular peduncle, while the distances between them slightly diminish in length. Antennal spine small, not yet reaching to the anterior margin of the 2nd joint of the antennal peduncle, branchiostegal spine minute. Abdomen nearly 4-times as long as the carapace. Posterior margin of 3ld tergum moderately produced. Sixth somite almost twice as long as 5th : in the full-grown female the 6th somite is 7,4 mm. long, the 5,h 4 mm., in the male these numbers are 5,4 mm. and 2,5 mm.; in the female the telson without terminal movable spines is y,y mm. long, in the male 5,7 mm., appearing slightly longer than the 6th somite. The telson has 3 pairs of side spines above, it is as long as the inner uropod, but shorter than the outer. The eyes are described by Miss Rathbun as considerably larger than those of a species which she is inclined to refer to Pies. ocellus, in the present specimens they are, however, of a moderate size; in those of the female (Fig. 27a) the transverse diameter (2,8 mm.) is little more than one-fourth the length of the carapace and this diameter is slightly longer than the axial. Ocellus also of moderate size, broadly in contact anteriorly with a process from the cornea dipping towards it. Antennular peduncle reaching to the middle of the antennal scale-, 3rd joint a little longer than 2nd, stylocerite pointed, as long as basal article, flagella subequal, the longer nearly as I-S long as carapace and abdomen combined. Antenna! peduncle a little longer thari the basal joint of that of the upper antennae, scaphocerite (Fig. 27e) almost as long as the carapace (in the female 9 mm. long), slightly more than 4-times as long as wide, distinctly narrowing anteriorly, outer margin slightly concave proximally, terminal spine distinctly reaching beyond the truncate tip of the lamella. The external maxillipeds reach by their terminal joint and one-fourth of the penultimate beyond the antennal scale; exopodite small, not yet reaching to the middle of the antepenul- timate joint. The peraeopods of the ist pair reach by four-fifths their terminal joint (or propodus) beyond the external maxillipeds; the penultimate joint or carpus is almost twice as long as the terminal, these joints being respectively 9,1 mm. ancl 5 mm. long in the adult female; a microscopical chela seems to be present. The slender legs of the 2nd pair are equal and reach by the chela and two-fifths of the carpus beyond the antennal scale, while the merus extends to the far encl of the antennal peduncle: in the adult female the carpus, which is composed of 19 or 20 segments, is 9,8 mm. long, as long as the carapace, and the chela, the fingers of which have the same length as the palm, is 1,6 mm. long, one-sixth of the carpus. In the adult female the legs of the 3rd pair reach by the dactylus, the propodus, the carpus and one-fifth of the merus beyond the antennal scale, the merus of the 4fh pair reaches almost to the distal extremity of the antennal scale and the legs of the 5"1 pair reach by the dactylus, the propodus and four-fifths of the carpus beyond the scaphocerite. At the right side the 4th and the 5th legs are complete, but in those of the 3rd pair the propodus and the dactylus are wanting; on the left side the 3rd leg is wanting and the dactylus of the 5"1. The meri diminish regularly in length from the yd to the 5th and those of the 3ld pair are distinctly thicker than the meri of the 4th and 5*5 the meri are spinose, like in the allied species, but the number of spines is small. The same regularity does not exist in the carpi, for the carpus of the 4lh leg is distinctly shorter than that of the 3rd, but the carpus of the 5th pair is longer than that of the preceding leg. The propodi, however, probably increase regularly in length, for those of the 5* pair are longer than the propodi of the 4,h and in the allied Pies. occllus (Bate) the propodus of the 3rd pair is shorter than that of the 4lh. The dactyli are very short, measuring in the 4th pair (Fig. 27c) about 1ju , in the 5,h (Fig. 2-jd) l/u the length of the propodi-, they are of a stout shape, 5-times as long as broad at base both in the 4"1 and in the 5thpair, and their posterior margin is unarmed, without spinules, except one or two near the tip. In the adult, full-grown female the carpus of the right 4th leg is 12,3 mm. long, the propodus 11,3 mm., the dactylus 1 mm., for the left leg these numbers are in the same succession 10,7 mm., 10,4 mm. and 1 mm.; the carpus of the right 5th leg is 12,8 mm. long, the propodus 13,6 mm., the dactylus 0,9 mm., in the left leg these numbers are in the same succession 12,75 mm. and 1 3 mm. (the dactylus is lost). Attention may also be called to the fact that the measurements of carpus and propodus differ rather much in the two legs of the 4th pair. In the male, which is much smaller, the three posterior legs are lost. The male from Stat. 95 has nearly the same size as that from Stat. 253. The extreme i 29 tip of the rostrum is broken off, it reaches still a little bevond the antennal scale; there are proximally 4 movable teeth that slightly increase in length from the ist to the 4th, the 5"1 tooth stands above the orbital margin and is foliowed by five that become gradually smaller, while one observes after a short distance still 3 much smaller teeth, which also diminish in size. There are 7 teeth on the lower margin, the ist near the distal end of the antennular peduncle, and these teeth become also gradually smaller. The left leg of the 2nd pair that reaches by the chela and two-fifths of the carpus beyond the antennal scale, is a little longer than the right, of which only the chela extends beyond the scale; the carpus of the left leg is 7 mm., that of the right 6 mm. long. The three posterior legs are very incomplete. The male from Stat. 253 is (Fig. 27e) 45,5 mm. long (rostrum 10 mm., carapace 7,5 mm., abdomen 2S mm.) from apex of rostrum to tip of telson, the much larger female 48 mm. from orbital margin to tip of telson (carapace 10 mm., abdomen 38 mm.); the male from Stat. 95, finally, measures 42 mm. (rostrum probably 8,6 mm., carapace 7,4 mm., abdomen 26 mm.). General distribution: Hawaiian Islands (Rathbun). 5. Plesionika unidens Bate. PI. XI and XII, Fig. 28 — 28/;. Plesionika unidens C. Spence Bate, Report Challenger Macrura, 1888, p. 648, PI. CXIII, fig. 4. Plesionika affinis A. R. S. Anderson. in: Annals Mag. Nat. Hist. Ser. 7, Vol. III, 1899, p. 285 (teste A. Alcock). Pandalus (Plesionika) unidens A. Alcock, Descr. Catal. Indian Deep-Sea Crustacea. Calcutta 1901, p. 97. Stat. 12. March 14. 7°i5'S., U5°i5'.6E. Bali Sea. 289 m. Bottom mud and broken shells. 1 adult, eggdaden female. Stat. 65a. May 6. Very near Station 65 (7°o'S., I20°34'.~5 E.). From 400 m. Bottom pale, grey mud, changing during haul into coral bottom. 1 adult, eggdaden female. Stat. 253. Dec. 10. 5°48'.2 S., I32°I3'E. West of Kei-islands. 304 m. Bottom grey clay, hard and crumbly. 1 specimen of medium size, without eggs, probably female. Plesionika unidens Bate differs from all the other species of this genus by the characteristic carination (Fig. 28^) of the 3vdabdominal tergum, which is compressed and carinated dorsally in the middle, the carina ending abruptly, like a tooth, nearly at the posterior fourth, while at the anterior fourth it gradually passes into the surface of the tergum. This species is moreover distinguished by the existence of a solitary tooth on the upper border of the rostrum, somewhat behind the apex, while the rest is smooth until near the base. Unfortunately in the female from Stat. Ó5a the rostrum is broken off at the level of the distal extremity of the antennular peduncle, while in the two other specimens the rostrum is also broken off near the tip, so that the solitary tooth is wanting. Xevertheless these specimens should, no doubt, be referred to Pies. unidens Bate, because in the other characters they apparently agree with this species. Measured dorsally, the carapace of the female from Stat. 12 (Fig. 2S Length of telson Height of 6th somite anteriorly Thickness of 6'h somite in the middle. Length of carpus of 3rd leg „ „ propodus „ , „ „ dactylus „ „ „ „ „ carpus of 4,9 2,1 8 74 broken 12 40 3,5 6,7 9 4 2,5 14 1 1 2,7 14,25 H,25 2,25 16,25 18,25 N° 1 — 3 Stat. 251, N° 1 female without eggs, N° 2 ova-bearing female, N° 3 young specimen ; N° 4 — 8 type-specimens of Plesionika spinipes Bate var. grandis Don1, from near Alisaki, Sagami Bay, Japan, depth 200 — -300 m., all ova-bearing, except N° 8. General distribution: Off Cape Comorin (Alcock); North of New Guinea (Spence Bate); Sagami Bay, Japan (Doflein, Balss); Kagoshima (Balss); Kermadec Islands (Chilton). 3. Parapandahis serratifrons Borr. PI. XII and XIII, Fig. 34 — 34^. Pandalus (Parapandahis) serratifrons L. A. Borradaile, in : A. VVlLLEV's Zoological Results. Part IV. Cambridge, Sept. 1899, p. 411, PI. XXXVII, fig. 8a— Sd. Pandalus (Parapandahis) tenuipes L. A. Borradaile, 1. c. p. 412, PI. XXXVII, fig. 9. ? Pandalus pristis W. de Haan, Fauna Japonica, Crustacea, 1849, P- '75- Stat. 306. Febr. 8, 1900. 8°27'S., I22°54'.5E. Lobetobi Strait. 247 m. Bottom sandy mud. 91 specimens, viz. 35 males and 56 females, that are nearly all egg-laden. Stat. 312. Febr. 14, 1900. 8° 19' S., ii7°4i'E. Saleh-bay, North coast of Sumbavva. 274 m. Bottom fine, sandy mud. 126 specimens, viz. 46 males, 50 females, 22 of which are ova-bearing and 30 young specimens. The rostrum which in the adult species is 2 — 21/3-times as long as the carapace and in younger individuals even 21/.,-times, is very slightly depressed as far as the tip of the antennular peduncle and from here it is moderately curved upwards, running then straight forward to the acute tip ; the gastric carina begins on the middle of the carapace, it is low and rounded. In Fig. Sa of Borradaile's paper the rostrum runs almost horizontally forward, but Dr. Calman wrote me that in the three cotypes of the British Museum Collection the rostrum is distinctly bent upwards near the base. The upper margin is finely and evenly serrate i47 with 50 — 66 small, close-set teeth, that reach to near the tip and four, five or six of which stand on the carapace behind the orbital margin; the distance between the ist tooth and that margin measures 1/1 or 1/B the length of the carapace. The carapacial teeth (Fig. 340) gradually increase a little in size, so that, like in Parap. spinipes (Bate), those that are placed above the eyes, are somewhat larger than the following that decrease in size-, sometimes, though rarely, these larger proximal teeth are a little longer, their apices a little farther distant from one another than usually, like in Fig. 9 of the original description. The lower margin bears 32 — 44 teeth, that are a little smaller than those of the upper; the 1 st tooth stands just beyond the tip of the antennular peduncle and the foremost one or two stand just before the anterior tooth of the upper margin. All the teeth of the rostrum are fixed, not movable as did describe them Borradaile, except the hrst one or two of the upper margin: as Dr. Calman mentioned, also in the cotypes of the British Museum they are fixed. Antennal tooth well-developed, though small, hardly reaching to the cornea of the eye- peduncles when stretched forward ; branchiostegal spine much smaller, directed forward and downward. Posterior margin of 3rd abdominal tergum moderately convex. Sixth somite (Fig. 34^, 34^), measured dorsally, twice as long as fifth and t w i c e or slightly more than twice as long as high or broad anteriorly; the 6dl somite, the upper border of which is faintly grooved longitudinally, is rather strongly compressed, so that, when looked at dorsally, the thickness in the middle proves to be only about one- fifth the length. Telson as long as 6th somite, distinctly short er than the endopodite of the caudal fan, though the longer terminal spinules reach as far backward, endopodite much shorter than exupodite ; there are three pairs of small, dorso- lateral spinules, besides those at the tip. Eyestalks of moderate size, cornea more than half the length of the ophthalmopod, ocellus distinct, circular, almost independent, only anteriorly for a short distance in contact with the cornea. Antennular peduncle short, reaching only along about the two proximal fifths of the antennal scale, 3rd joint hardly longer than 2nd, stylocerite acute, as long as basal article; flagella subequal, nearly as long as the body, rostrum included. Antennal peduncle reaching to the distal extremity of ist or 2nd antennular article, flagellum twice as long as the body, rostrum included; scale as long as the carapace, nearly half as long as the rostrum, a little more than 5-times as long as wide proximally, rather narrow, distinctly tapering, the terminal spine projecting beyond the truncate tip of the lamella. The external maxillipeds reach by the terminal joint and in the male one-fourth, in the female one-sixth the penultimate beyond the antennal scale; Dr. Borradaile was wrong, when describing the third maxilliped as longer by its last two joints than the scale, for in his figure Sa it is not the case: Dr. Calman, however, informed me that in the cotypes the third maxillipeds extend beyond the scale by very little more than the last segment. Penultimate joint slightly more than one and a half as long as terminal, exopodite small, reaching along the proximal third of the antepenultimate joint. The legs of the ist pair project by the terminal joint and one-half to two-thirds the carpus beyond the antennal scale, while they surpass the external maxillipeds by the terminal joint and one-fourth or one-fifth of the carpus ; the carpus 148 is in the adult female 21/s-times, in the male almost 21/.,-times as long as the terminal joint, a microscopical dactylus seems to be present. According to the original description the peraeopods of the ist pair should surpass the external maxillipeds by their last two joints, this is not the case and already negatived by the figure 8 a itself. The peraeopods of the 2nd pair are equal and reach by the chela and one-third to two-fifths of the carpus beyond the antennal scale, while the meri extend as far forward as the antennular peduncle; wrist composed of 25 — 30 joints, terminal joint twice as long as broad, as long as the three preceding combined. Chela nearly twice as long as the last joint of the carpus, fingers two-fifths longer than palm. The three posterior legs, that much resemble those of Parap. spinipes (Bate), are very long and slightly increase in length posteriorly ; the peraeopods of the 3rd pair measure in the male, long 82 mm., (N° 6 of the Table) tvvo-thirds, in the ova-bearing female, long 87 mm., (N° 9 of the Table) three-fourths of the entire length, rostrum included, those of the 4"1 pair in the male three-fourths, in the ova-bearing female seven-eighths, those of the 5th pair, finally, in the male four-fifths, in the ova-bearing female ten-elevenths of that length. The legs of the 3rd pair reach, both in the male and in the female, by the dactylus, propodus and nearly the entire carpus beyond the antennal scale, those of the 4th pair by the dactylus, the propodus and in the male by three-fourths, in the female eight-ninths of the carpus, the legs of the 5th pair, finally, by the dactylus, the propodus and in the male by two-thirds, in the female four- fifths of the carpus. The carpi slightly increase in length from the 3rd to the 5th pair, the propodi, however, much more, so that those of the 5th pair are one and a half or a little more than one and a half as long as the propodi of the 3"1 pair; the meri, that show nearly the same length in the three legs, are armed with slender distant spines. The dactyli are rather (Fig. 34^, 34^) short in proportion to the length of the propodi, measuring 1L to l/-i„ of the latter; they are, however, very slender, terminate in a nearly straight terminal claw (stylopodite), at the base of which a short spin e and a few setae are implanted. So e. g. are the dactyli of the 5th pair (Fig. 346') of an adult, ova-bearing female 2,4 mm. long, 11- or 12-times as long as wide at base, the terminal claw (stylopodite), 0,4 mm. long, measures one-sixth the whole length of the joint, while the accessory claw measures only one-third of the terminal. The male attains a length of 85 mm. from apex of rostrum to tip of telson, the largest ova-bearing female is 102 mm. long-. Table of Measurements in millimeters. Entire length Length of rostrum „ „ carapace Numberofteeth on upper margin „ „ „ lower „ Length of 5th abdominal somite » telson 70 25 10,5 6 63 33 3,6 7-5 broken 2 3 4 5 6 7 8 about 9 10 102 90 88 88 82 71 64 87 86 35,5 30,5 30 30,25 26,25 23,5 broken 27,5 30 15,5 H 13,5 13,75 '3 I I 10 H,3 '3,5 66 52 65 6 58 60 52 • 50 57 43 32 44 39 35 37 • 34 34 5-25 4.5 4.5 4,5 4,6 3-7 3,25 5 4,5 10,5 9-5 9-5 9,25 8,75 7fi 7,25 9,75 9 1 1 9.5 9.5 9,5 9 7.5 7 9,5 9 broken 12 4,25 8,4 8,5 i49 i 2 3 4 5 6 7 8 9 10 11 Height of 6* somite anteriorly 3,6 5 4-75 4.5 4.5 4 3,7 3,6 4,7 4,5 4,' Minimum thickness of 6th somite i.5 2,3 2 2 -? i.7 1,4 1,2 1,75 i,75 1,7 Length of carpus of 3rd leg 15.5 • 19.25 20,5 16,2 16 'S 19.3 21 17 V , propodus „ „ „ 13.5 • • 18 18,25 14,6 13,5 i3>7 17,5 16,5 15,25 fl „ dactylus „ B „ i.5 • • 2 2 1,52 ',55 i.7 2 2 1,7 V v carpus of 4th leg 16,25 23 21 22 22 16 16 15.5 22,5 • 18,75 w „ propodus „ „ v 18,7 25.5 23.5 wanting 25.5 l9 18,5 18,75 24 • 22 V „ dactylus „ „ „ want ing 2,14 2,18 » 2,1 i,45 1,84 i,88 2,2 • 2,2 , „ carpus of 5th leg v 25 21 23.25 23,5 17 17 16,5 24 23 20,5 ÏJ „ propodus „ „ •n 29 24 28 29 21,5 22,5 21,5 28 28 26,2 » „ dactylus „ „ „ V 2,25 2 2,25 2,5 1,92 1,92 2,06 2,75 2,46 2,6 N° 1 — 5 Stat. 306, N° 1 male, N° 2 — 5 ova-bearing females-, N° 6 — 11 Stat. 312, X" 6 — 8 males, N° 9 — 11 ova-bearing females, the entire length of N° 11 could not be given, the rostrum wanting entirely. Parapandalus tenuipes Borr., which occurs in the same locality as this species, is 110 doubt identical. The description agrees almost literally with that of Parap. serratifrons and no characters are mentioned by which both forms can be distinguished. When the figure of this species (1. c. fig. 9) is compared with that of Parap. serratifrons, some differences are, however, recognizable, which probably have led the author to consider Parap. tenuipes as a distinct species, but in this case it is quite singular that they were not indicated in the description. In the figure of Parap. tenuipes the propodus of the i5t pair of legs is longer in proportion to the carpus than in Parap. serratifrons, in this species the carpus of the 3ld pair appears as long, fig. 8a, as the propodus, but in the figure 9 distinctly longer, in fig. 8 a the carpus of the 4* pair appears a little shorter than the propodus, in fig. 9 a little longer than this joint and, as regards the 5th pair, the propodus appears in fig. 80 a little longer, but in fig. 9 a little shorter than the carpus. The rostral teeth of the upper margin appear proximally farther distant from one another in fig. 9 than in fig. 80=, but I have already pointed out (p. 147) that in some specimens of Parap. serratifrons the rostral teeth are slightly longer, their apices farther distant from one another than is usually the case. As regards the differences in length of the joints of the legs, I may remind of the fact that a similar variability in the measurements has also been observed in Pies. martia (A. M.-Edw.) var. scmilaevis Bate (p. 1 1 9), but it occurs indeed also in Parap. serratifrons, as results from the Table of Measurements. The propodus of the 3rd pair of the ova-bearing female (N° 10), for instance, is much shorter in proportion to the carpus than in the egg-laden female (N° 4), the propodus of the 4"1 pair in the female (N° 11) longer in proportion to the carpus than in the female (N° 9), the dactylus of the 4th pair in the male (N° 6) shorter in proportion to the propodus than in the male (N° 7), the propodus, finally, of the 5th pair in the female (N° 11) much longer in proportion to the carpus than in the female (N° 3). Therefore both species are considered as identical. Dr. J. J. Tesch, formerly of the Leyden Museum, has been so kind to examine for me the only still existing specimen from Japan, that was described by de Haan (Fauna Japonica, Crust., p. 175) under the name of Pandalus pristis, and to compare it with an adult, ova- *50 bearing female of Parap. serratifrons Borr. from Stat. 306, which I had sent to him. Having received his observations and measurements, I conclude that this specimen must be referred to Parap. serratifrons Borr., for it only differs by a somewhat larger size and by the carpus of the 2nd legs being of a darkbrown colour, while in Parap. serratifrons it is whitish. The specimen looks, as Dr. Tesch wrote me, rather poorly, is apparently badly preserved, damaged and partly putrefied. The length from the orbital margin to the tip of the telson is about 79 mm., in the largest measured specimen of Parap. serratifrons only 67 mm.; the other measurements are the following: Length of carapace from orbital to posterior margin: 18 mm. Length of rostrum as far as preserved: 27 mm. Length of abdomen without telson: ± 45 mm. Length of 5th abdominal somite, measured dorsally : 6 mm. Length of 6,h abdominal somite: 13 mm. Maximum height of 6th somite: 5,75 mm. Thickness of 6th somite in the middle: 2,75 mm. Length of telson: 14 mm. The endopodite reaches a little farther backward than the telson. The abdomen fully resembles that of Parap. serratifrons. Behind the orbital margin in de Haan's specimen five teeth stand on the carapace and the teeth fully resemble those of that species. The external maxillipeds, the penultimate joint of which is one and a half as long as the terminal, reach beyond the antennal scale by the terminal joint and nearly one-sixth of the penultimate; exopodite relatively as long as in the specimen of Parap. serratifrons. The legs of the 2nd pair are equal, 43 mm. long; the carpus is 18,5 mm. long and 0,75 mm. thick at its distal extremity, for the female of Parap. serratifrons these numbers are 14 mm. and 0,58 mm., so that their proportion proves to be the same. In de Haan's specimen the 2nd legs, of which the carpus has a dark brown colour, reach almost as far forward as the external maxillipeds, but in his description we read "maxillae quintae, pes primus sinister et pedes secundi laminis ant. inf. multo longiores", like in Parap. serratifrons. Of the three posterior legs, that have no epipodites, the meri are armed with some distant spines ; the three last joints (carpus, propodus and dactylus) are wanting. The identification of de Haan's species with Parap. spinipes (Bate) [H. Balss, Ostasia- tische Decapoden, II, 19 14, p. 31] proves thus to be erroneous. Parapandahts pristis (Risso) from the Mediterranean (Plate XIII, Fig. 35, 35 a) bears such a close resemblance to Parap. serratifrons (Borr.), that I did at first hesitate to regard the latter as a distinct species. I was, however, enabled to study three adult specimens, a male and two egg-laden females, taken off Barcelona, belonging to the Leyden Museum» and a young specimen from the Gulf of Naples (my private collection) and, thanks to these specimens, I finally succeeded in discovering a character by which both species may easily be distinguished, namely the entirely different shape of the dactyli of the three posterior legs. Not only, indeed, are these joints in the Mediterranean species shorter i5i in proportion to their propodi, but their form is quite different; the dactyli are namely of a much less slender shape, only 5- or 6-times as long as wide at base, the terminal claw (stylopodite) measures one-third the entire length of the joint and the accessory claw is nearly half as long as the terminal. The measurements in millimeters of the three Barcelona specimens and that from Naples are the following: Entire length Length of rostrum „ „ carapace Number of teeth on upper margin „ , „ lovver „ Length of 5th abdominal somite. fith r, „ telson Height of 6th somite anteriorly . Minimum thickness of 6th somite Length of carpus of 3rd leg . „ „ propodus „ „ „ . „ v dactylus „ ., „ . „ carpus of 4* leg . „ „ propodus „ , , . , dactylus „ „ „ . „ „ carpus of 5th leg . v propodus „ „ „ . „ , dactylus „ „ „ . N° 1 male, N,J 2 and 3 ova-bearing I 2 3 4 97 98 97 about 75 32,5 35 33 23 + ? •3.3 '3 •3.5 • 1 1 58 61 63 33 45 47 5.2 4.7 4,75 3.5 10,5 10,5 1 1 8,9 1 1 ? 9.5 9.75 8,25 4,7 4-5 4,5 3-5 i.9 2 '-75 1.5 13.5 19.5 20,5 16,25 12,5 15,2 8'3 . •3.5 1,16 wanting 0,9 1 • 20 19.5 - 20.S 20 0,94 1,2 i.3 14 21 23 •7.5 16,5 24,3 21 19.75 0,94 [,2 1,27 1 females of Parapandalus pristis (Risso) from off Barcelona. When measuring the 4th leg of the male, the carpus and propodus were broken, so that it proved impossible to measure them exactly. When comparing these measurements with those of Parap. serratifrons, the close resemblance will strike ; of the female (N° 3) the propodus of the 3rd leg is abnormally short, while the propodus of the 5th is shorter than the carpus. N" 4 Gulf of Naples. Pandalus escatilis Stimps. from off Madeira seems to be likewise a closely related form, but to differ from Parap. serratifrons Borr. by the endopodite of the external maxillipeds resembling that of Pandalus annulicornis Leach : in the latter species indeed the penultimate joint of the external maxillipeds is not longer, but shorter than the terminal (Vide W. T. Calman, Annals Mag. Nat. History. Ser. 7, Vol. III, 1899, PI. II, fig. ld). General distribution: Blanche Bay, New Britain (Borradaile) ; D'Entrecasteaux Group, Britisch New Guinea (Borradaile). Dorodotes Bate. The genus Dorodotes Bate is still only represented by one species, a rare form observed in the Indian Archipelago and in the Bay of Bengal, where it occurs at the great depths varying between 1050 and 1530 fathoms. 152 i . Dorodotes reflexus Bate. Dorodotes reflexus C. Spence Bate, Report Challenger Macrura, 1888, p. 678, PI. CXVI, fig. 3. Dorodotes reflexus A. Alcock, Descript. Catalogue Indian Deep-Sea Crustacea, Calcutta 1901, p. 109. Stat. 221. Nov. 4. 6°24'S., I24°39'E. Banda Sea. 2798 m. Bottom solid bluish grey mud with foraminiferae, covered by a 5 cm. thick layer of brovvn mud, uppermost layer of foraminiferae. 1 adult specimen. Unfortunately this specimen is much damaged, it has 110 abdomen and the three posterior legs are also wanting, one of these legs and parts of tvvo other ones are lying loose in the tube. Carapace 25 mm. long from the orbital to the posterior margin, rostrum, measured in a straight line from the orbital margin to the apex, 13,4 mm. There are 7 teeth on the upper margin of the rostrum proper and 9 on the dorsal crest of the carapace, of which the first five are movable, being distinctly articulated which is not the case in the others; lower margin with 6 teeth, the ist of which stands at the far end of basal antennular article. Antennular peduncle a little shorter than the rostrum, the difference as long as 3rd antennular article; 2nd article one and a half as long as 3rd, stylocerite acuminate, as long as basal article. Antennal scale 15 mm. long, a little more than half as long as the carapace; terminal spine of the outer margin shorter than the obtuse tip of the lamella. The external maxillipeds reach by one fourth their terminal joint beyond the antennal scale, while the ist pair of legs reach to the tip of the latter, being slightly shorter than the external maxillipeds. The peraeopods of the 2nd pair extend by the chela and the four last joints of the carpus beyond the distal extremity of the antennal peduncle; the carpus is 10-articulate, the ist and the last or ioth annulation are longer than the rest and the ist is slightly longer than the last; the rest are a little unequal, the jth — gth are of equal length and the shortest of all. General distribution: Xear Banda Island (Bate); Philippine Islands (Bate); Bay of Bengal (Alcock). Heterocarpus A. M.-Edw. The genus Heterocarpus A. M.-Edw., chiefly characterized by the longitudinal carinae of the carapace in addition to the multiarticulate carpus of the 2nd pair of legs which are of unequal length and size, is nowadays represented by about 20 species and 1 variety, that are distributed throughout the Atlantic and the Indopacific regions. Heteroc. ensifer A. M.-Edw., for which this genus was established in 1881, was captured by the expedition of the "Blake" (1877 — 1880) off the islands of St. Kitts, Montserrat, Barbados and Grenada, West-Indies; specimens of the same species, however, had already been taken in 1874 by the "Challenger" between the Philippine Islands and Borneo. Heteroc. ensifer has also been recorded from the Hawaiian Islands, New Britain and the Sagami Bay, Japan, so that its range is rather extensive. Heteroc. carinatus (S. I. Smith), established on a young specimen from the east coast of the United States, must no doubt be considered as identical with this species. A new variety parvispina was obtained by the "Siboga" in the Bali Sea, north of Sulu Island and near the DO Kei-islands. Besides Heteroc. ensifer still three other species occur in the West-Indian seas, viz. Heteroc. oryx A. M.-Edw. from the Gulf of Mexico, Heteroc. laevis A. M.-Edw. from off Martinique and Heteroc. Alexandri A. M.-Edw. from Havannah : the last mentioned form has also been recorded from the Hawaiian Islands. While the western Atlantic is inhabited by four species of this genus, only one is known from the eastern, namely Heteroc. Grimaldii A. M.-Edw. and Bouv., which was taken by the "Talisman" near the Azores. By far the largest number of species are, however, found in the Indopacific and of these the majority occur in the Indian Archipelago. No less than 8 species indeed, including the already mentioned variety parvispina of Heteroc. ensifer A. M.-Edw., have been obtained by the "Siboga". Of Heteroc. Wood-masoni Alcock, a species hitherto still only imperfectly known by two young individuals from the Andaman Sea, 27 well-preserved specimens were collected in Madura Strait, the Bali Sea, off Makassar and near the Kei-islands. Heteroc. tricarinatus Alcock & Anderson, first observed in the Arabian Sea and afterwards also near East London, Cape Colony, was taken south of Muna Island and at the entrance of the Gulf of Boni. The closely related Heteroc. gibbosus Bate, first discovered by the "Challenger" off Tablas Island, one of the Philippines, was captured in the Bali Sea, at the southern entrance of the Strait of Makassar and near the Kei-islands, where several specimens were collected : this species, however, is also fairly common in the Andaman Sea, the Bay of Bengal and the Arabian Sea, off the Travancore coast. Heteroc. lepidus, one of the two new species obtained by the "Siboga", occurs in the Flores Sea and near the Kei-islands. Heteroc. laevigatiis Bate is known from East London, Cape Colony, from the Arabian Sea, from the Banda Sea, from off Banda Islands and ranges as far as the Hawaiian Islands. Heteroc. signatus Rathb. is still only known from the Hawaiian Islands, Heteroc. unicarinatus Borr. only from off Providence Island, north of Mada- gascar and Heteroc. longirostris Mac Gilchrist only from the Bay of Bengal. The 3 or 4 remaining species are those, in which two or three abdominal terga are produced posteriorly into overhanging spines. In the first place the interesting new Heteroc. Sibogae, of which 42 fine and well-preserved specimens were collected in various parts of the Archipelago, a form which is related to Heteroc. ensifer A. M.-Edw.: it occurs also in the Andaman Sea. Heteroc. dorsalis Bate, first discovered by the "Challenger" off Banda Islands, was taken by this expedition at no less than eleven Stations in various parts of the Archipelago, from the Bali Sea to Menado and the Kei-islands. The closely allied Heteroc. affinis Borr. is still only known from Saya de Malha in the Western Indian Ocean, Heteroc. Alphonsi Bate, finally, taken by the "Challenger" south of the Philippines and off Japan, occurs also in the Andaman Sea, the Bay of Bengal and the Arabian Sea and has even been observed off Cape Natal: it appears, however, somewhat doubtful whether this form and Heteroc. afjinis are indeed different from Heteroc. dorsalis Bate. Three species, finally, occur on the west coast of America, firstly Heteroc. vicarius Faxon, the representative of the indian gibbosus and which has been taken in the Gulf of Panama, furthermore two closely related species, Heteroc. hostilis Faxon and Heteroc. affinis Faxon, representatives of Heteroc. dorsalis and Alplionsi: of these two Heteroc. hostilis is also found in the Gulf of Panama, the other off Acapulco and near Las Tres Marias. SIUOGA-EXI'EDITIE XXXIX rt3. 20 154 The vertical range of the species of Heterocarpus varies rather much, not only according to the species, but often also one and the same species has been observed at various depths. Heteroc. Alexandri A. M.-Edw. was obtained by the "Blake" off Martinique at 1030 fathoms like also Heteroc. tricarinatus Alcock & Anderson south of Muna Island : this is the greatest depth, at which a species of this genus was observed. Heteroc. ensifer A. M.-Edw. on the contrary occurs at less considerable depths and was taken e. g. in Pailolo Channel, Hawaiian Islands, in 31 to 290 fathoms. While some species were captured at moderate depths, like Heteroc. ensifer, JVood-masoni, vicariits or signatus, other ones occur in much deeper water, so e. g Heteroc. Alexandri, /wslilis, Grimaldii and longirostris. Key to the Indopacific species of the genus Heterocarpus A. M.-Edw. «, Abdominal terga, though some may be bluntly carinated, never produced posteriorly into overhanging spines. bx Postocular carina completely wanting. Third abdominal tergum armed with an acute spine, arising from the anterior half. Wood-mdsoni Alcock ó2 Postocular carina present. No spine on third abdominal tergum. cl Postantennal carina completely wanting. Of the upper teeth of the rostrum four on the carapace, the ist a little before the middle of it, the 5th just beyond the orbital margin. Dactyli of the three posterior legs long and slender , . . Alexandri A. M.-Edw. (A. Milne-Edwards, Recueil de Figures de Crustacés nouveaux ou peu connus, Avril 1883, PI. 28.) c2 Postantennal carina more or less developed. dx Branchiostegal spine long, reaching beyond the 2nd joint of the antennal peduncle and usually projecting beyond the orbital spine. e1 Postantennal carina measuring only one-fourth the length of the carapace unicarinafns Borr. l) (L. A. Borradaile, Annals Mag. Nat. Hist. Ser. 8, Vol. XV, 1915, p. 208.) e2 Postantennal carina measuring at least two-thirds the length of the carapace. /j Scaphocerite little more than half the length of the carapace. Dactyli of the three posterior legs of a stout shape and short, those of the 3rd pair measuring about one-sixth the length of the propodi laevigatus Bate 1) This species is placed here, because it is described as being related to Heteroc. longirostris Mac Gilchrist. 155 f. Scaphocerite longer, nearly two-thirds the length of the carapace. g} Rostrum about i3/4-times the length of the carapace. Orbital spine as large and projecting just as far as the branchiostegal spine. The blunt carina of the 3rd abdominal tergum posteriorly acutely produced to a bluntish point. Dactyli of 3 posterior legs short lo7igirostris Mac Gilchrist (A. C. Mac Gilchrist, in : Annals Mag. Nat. Hist. Ser. 7, Vol. XV, 1905, p. 237.) gü Rostrum little longer than the carapace. Branchiostegal spine much longer and more advanced than the orbital. Abdomen as in Heter oc. vicarius Faxon, only the 3rd tergum being crested and that bhmtly signatus Rathb. ]) (M. J. RATHBUN, in: U.S. Fish Commission Buil. for 1903, Part III, Wash. 1906, p. 91S, PI. XXI, fig. 6.) ds Branchiostegal spine short, not reaching beyond the 2ntl joint of the antennal peduncle and projecting less forward than the orbital. //, Dactyli of the three posterior legs long and slender, those of the 3rd pair measuring about one-third the length of the propodi. ïj Upper margin of the rostrum proper armed with 7 or 8 teeth tricarinatus Alcock & Anderson L Upper margin of the rostrum proper armed with 2 or 3 teeth gibbosus Bate. //, Dactyli of the three posterior legs short and stout, those of the 3rd pair measuring one-sixth to one-eighth the length of the propodi. Rostrum strongly recurved, as long as the carapace, 6t+03-dentate Icpidus de Man aa_ Some of the abdominal terga are sharply carinated and some carinae of them are produced posteriorly into over- hanging spines. bx The 3rd and 4th abdominal carinae are produced as spines. cx First and second abdominal terga not sharply carinated. First tooth of postrostral crest placed a little anterior to the middle of carapace. dx Spine of 4th abdominal tergum more than half as long as that of 3,d ensifcr A. M.-Edw. 1) The length of the dactyli of the three posterior legs is not mentioned in the description and caDnot be ascertained fiom the photograph. 156 d„ Spine of 41'1 abdominal tergum measuring but one- fourth that of 3rd ensifer A. M.-Edw. var. parvispina de Man c„ First and second abdominal terga provided with a high, prominent and sharp carina. First tooth of postrostral crest placed a little behind the middle of carapace Sibogae de Man 62 The 3ld, 4th and 5"1 abdominal terga are produced as spines afjïnis Borr. :) (L. A. BORRADAILE, 1. C. IQI 5, p. 208.) Alphonsi Bate (C. Spence Bate, Report Challenger Macrura, 1888, p. 632, PI. CXII, fig. 1.) dorsalis Bate 1. Heterocarpus Wood-masoni Alcock. PI. XIII, Fig. 36 — 36 f. Heterocarpus Wood-masoni A. Alcock, Descript. Catal. Indian Deep-Sea Crust., Calcutta 1901, p. 108. Illustrations of the Zoology of the Investigator, PI. LI, fig. 2. Stat. 5. March 10. 7°4Ó'S., U4°3o'.5E. Madura Strait. 330 m. Bottom mud. 6 females of different size, 2 of which are ova-bearing and 1 young specimen. Stat. 12. March 14. 7°i5'S., U5°i5'.6E. Bali Sea. 289 m. Bottom mud and broken shells. 1 male, 2 females without eggs and 1 young specimen. Stat. 74. June 8. 5°3'.sS., U9°o'E. Off Makassar. 450 m. Bottom Globigerina ooze (obviously a thin layer). 2 females, one of which is full-grown and laden with eggs. Stat. 254. Dec. 10. 5°4o' S., I32°2Ó'E. Near the Kei-islands. 310 m. Bottom fine, grey mud. 1 adult, ova-bearing female. Stat. 256. Dec. 11. 5°2ó'.6S., I32°32'.5 E. Near the Kei-islands. 397 m. Bottom greyish green mud. 2 males and 1 1 ova-bearing females, all adult. Of this remarkable Heterocarpus, which was founded by Alcock on two young individuals from the Andaman Sea, no less than 27 well-preserved specimens of different size, males, ova-bearing females and young individuals, have been collected by the "Siboga", so that I am able to publish a better and more detailed description. Hetcroc. Wood-masoni is therefore such an interesting and remarkable species, because it differs from all the other known represen- tatives of this genus firstly by the postocular carina wanting completely, while the two other later al carinae of the carapace are developed throughout their whole course and furthermore by the existence of a sharp, curved spine on the anterior half of the 3rd abdominal tergum. The largest male is 131 mm. long from tip of rostrum to end of telson, the largest ova-bearing female 149 mm. In the adult species the carapace appears much higher in proportion to its length than in young individuals, one of which was figured on Plate LI of the "Illustrations of the Zoology of the Investigator". In the youngest specimen from Stat. 5 the carapace is 8,25 mm. long and 4 mm. high in the middle, twice as long as high; in the males from Stat. 256 these numbers are respectively 27 mm. and 16 mm., in the full-grown 1) This species is described as differing from Hettroc. AlpfconsiHate by (i) the rostrum being much more strongly upcurved, (2) by the joints of the carpus of the 2nd legs being less in number, (3) by the walking-legs being considerably longer than the antennal scale. i57 ova-bearing female from Stat. 74 32,5 and 19 mm., so that the carapace appears in the adult one and two-thirds as long as high. As results from the Table of Measurements the rostrum of full-grown specimens is usually a little longer than the carapace, more rarely both are of equal length; in younger individuals it is comparatively much longer, so that in the youngest specimens from the Stations 5 and 1 2 the rostrum appears twice as long as the carapace. The slender, tapering rostrum runs at fïrst downward for about half its length, while the distal part is more or less upturned, so that the apex is sometimes situated at the same level as the postrostral crest, in other specimens far above it. The upper margin is usually armed with 10 teeth, more rarely with 9 or 1 1 and constantly the two first stand on the carapace behind the orbital margin; these teeth are rather small, not prominent, placed at nearly equal distances from one another and reach to near the tip. The lower margin bears usually 8 teeth, more rarely 7 or 9 and in two ova- bearing females only 6 teeth were observed ; these teeth are much larger than those of the upper margin, though they gradually diminish in size. A rare exception is shown by an ova- bearing female (N° 26 of the Table): besides the two teeth on the carapace there are only 3 on the upper margin, of which the anterior stands midway between the distal extremity of the antennular peduncle and that of the antennal scale, so that more than half the length of the upper margin is smooth and unarmed. The rostrum is continued nearly to the posterior margin as a prominent, though obtuse carina: in very young specimens it is less distinctly developed on the cardiac region and the gastric portion, that carries the two first teeth, appears therefore comparatively higher than in older individuals. As already observed, there is no tracé of the postocular carina, but the postantennular and the postantennal carina run uninterruptedly from the posterior border of the carapace to the orbital and branchiostegal spines. The two carinae, though nearly parallel, are on the branchial region a little farther distant than anteriorly. The slender, acuminate, orbital spine extends, beyond the 2nJ joint of the antennal peduncle, to the middle of the corneae of the eyes; the branchiostegal spine is much shorter and reaches only to the middle of the 2nd joint of the antennal peduncle. Inferior marginal carina well-developed. In full-grown specimens the cardiac region is more or less rugose between the postrostral crest and the post-antennular carina and in the adult female from Stat. 74 one observes a short elevated line just below and parallel with the post-antennular carina, somewhat farther distant from the post-antennal carina than from the other. Abdomen nearly one-third longer than carapace and rostrum combined. The ist and 2nd terga are not only not carinate, but appear even slightly concave dorsally, especially the second. Like in other species the ist tergum bears four tubercles in a transverse line parallel with the posterior margin ; these tubercles show each an impressed point and the two lateral are a little farther distant from one another than those of the submedian pair. The 3ld tergum is armed with an acute, compressed spine, that arises in the adult species from a little more than the anterior half of the somite, strengthened on each side at its base by a faint oblique ridge that runs from the anterior border to the upper curved margin of the spine; the two ridges are in young specimens almost invisible. In the adult species the posterior margin of 153 the spine makes an acute angle with the slightly compressed, straight, upper border of the tergum, the spine being directed backward and little prominent; in younger individuals, however, in which the carapace is i8 mm. long and less, the angle between the posterior margin of the spine and the upper border of the terg-urn is much greater, al most right, so that in these specimens the spine is more prominent, more turned upward and its upper margin does not extend to the anterior border of the somite : in such specimens the spine looks as if arising from the middle of the tergum. When the spine is worn off, like in the youngest specimen from Stat. 12 or like in an adult, ova-bearing female from Stat. 256, it has the appearance of a hump-like elevation, as described by Alcock. On each side of the base of the spine there is a small, transverse groove, not far from and parallel with the anterior margin of the somite. In old specimens the upper border of the tergum appears, posterior to the spine, sometimes slightly fluted. The 4rh and the 5th tergum are rather compressed and in full-grown specimens appear even bluntly carinate; on the 4th tergum the upper border has a small notch or angle at the posterior third and the carina of the 5th reaches to near the posterior border of the somite. Near its posterior margin the 5th somite carries on each side of the upper border a small, longitudinally grooved tubercle. In very young specimens the 6,h somite is tvvice or even a little more than twice as long as the 5th and as long or hardly shorter than the telson, so, for instance, in the youngest specimen from Stat. 5 the 5"1 somite is 2,5 mm. long, the 6th 5,75 mm. and the telson 6,5 mm.; in older specimens the 6th somite is comparatively shorter, only a little more than one and a half as long as the 5th, so, e. g., in the adult female from Stat. 74 (Fig. 36a) the 5th somite is 10 mm. long, the 6th 16,5 mm., the telson 23 mm., in an ova-bearing female from Stat. 256 these numbers are 8 mm., 13,5 mm. and 20,5 mm. and in the adult male from the same Station 9 mm., 15 mm. and 20 mm. The dorsal surface of the 6th somite is deeply grooved longitudinally and this groove widens slightly from before backward ; on each side of the groove the 6th somite carries laterally a longitudinal ridge, that reaches to the posterior third and that is situated about twice as far from the lower than from the upper border. The telson of the adult male is one-third, that of the adult female al most one and a half as long as the 6th somite ; it is distinctly grooved longitudinally and bears 4 pairs of dorso-lateral spinules, besides those at the tip. In the adult the telson reaches as far backward as the outer uropods, sometimes it is a little longer or shorter and in the full-grown female from Stat. 74 it is even a little shorter than the inner uropod. The two pairs of antennae show nothing remarkable. The stylocerite reaches about to the middle of 2nd antennular article, which is a little shorter than the 3rd, and the antennular peduncle extends scarcely beyond the middle of the antennal scale ; the antennular flagella reach by a little more than half their length beyond the rostrum. Antennal flagella slightly longer than the body. External maxillipeds little shorter than the antennal scales, their exopodite extends almost to the far end of their antepenultimate joint. The three posterior legs are short, like in other species of this genus, in the adult the 3rd legs extend by half their dactyli or a little more beyond the antennal scales, while the two 159 following gradually diminish in length. Dactyli very long and slender, a little more than on e- half to two-thirds the length of the propodi. Eggs very numerous and small, 0,6 — 0,65 mm. long and 0,5 mm. broad. Table of Measurements in millimeters. Carapace Rostrum Formula I 2 3 4 5 6 7 8 9 10 11 12 •3 29 27,5 20,5 20 21 8,25 20, s 21,5 21 9 32,5 18 30 33.5 30 3' 28 29 16,5 27 30 30 18,5 32,5 30 28 1 1 2 1 0 •> 1 0 2 1 0 2 9 2 1 0 2 1 0 2 1 0 1 ö 2 1 0 2 9 2 1 0 2 10 8 7 8 8 8 7 7 8 8 8 e 7 8 Carapace Rostrum Formula 14 '5 16 17 IS 19 20 21 22 23 24 25 27.5 27 30 29 28 27.5 27.5 27 26 26 26 26 30,5 2 1 0 27.5 2 1 0 29.5 2 1 1 29.5 2 1 0 31.5 2 il 32 2 1 1 30 2 1 0 31 2 9 32,5 2 1 1 32,5 2 1 0 31 2 1 1 29.5 2 1 0 8 8 11 8 7 11 7 6 '.1 9 8 8 26 25,5 30 2 5 N° 1 — 6 Stat. 5, Nu 1 and 2 females with eggs, N" 3 — 5 females without eggs, N° 6 young; N° 7 — 10 Stat. 12, N° 7 male, N° 8 and 9 females without eggs, N° 10 young; N° 1 1 and 12 Stat. 74, N° 11 ova-bearing female, N° 12 female without eggs; N° 13 ova-bearing female from Stat. 254; N,J 14 — 26 Stat. 256, N° 14 and 15 adult males, N° 16 — 26 ova- bearing females. General distribution: Andaman Sea (Alcock). 2. Heterocarpus laevigatus Bate. PI. XIII, Fig. 37 — 37^. Heterocarpus laevigatus C. Spence Bate, Report Challenger Macrura, 1S88, p. 636, PI. CXII, fig- 3- Heterocarpus laevigatus A. Alcock and A. R. S. Anderson, in: Annals Mag. Nat. Hist. Ser. 7, Vol. III, April 1899, p. 285; A. Alcock, Descript. Catal. Indian Deep-Sea Crustacea, Calcutta 1901, p. 105. Heterocarpus laevigatus Th. R. R. Stebbing, in: Annals South African Museum, Vol. XV, London 1914, p. 40. Illustrations of the Zoology of the Investigator, Crustacea, Plate XLII, fig. 1, la. Stat. 215a. October 29. West IOOO m. distant from North point of Kabia-island reef. Banda Sea. 500 m. Bottom stone. 1 male of medium size. The carapace is 27 mm. long, the rostrum, measured in a straight line from the orbital margin to the apex, 34 mm., while the abdomen is 60 mm. long, entire length 121 mm.: the largest male and female of this species that are known, measured, however, respectively 181 mm. and 165 mm. (A. Alcock, 1. c. 1901). The rostral carina is armed dorsally with 6 teeth, of which the 5th is placed above the orbital margin, the foremost one just in advance of the eyes; ventrally there are 10 teeth, like in the specimen from the Cape Colony, recorded by the Rev. Stebbing. Apart from the somewhat different toothing of the rostrum, our specimen resembles the lïgure in the "Illustrations", except that the dorsal border of the 3rd abdominal somite appears in the male from Stat. 2i5a more strongly curved, like in the figure of Spence Bate. When the carapace both of Heteroc. gibbosus Bate and of Heteroc. laevigatus Bate is i6o looked at from above, in the former the outer margin of the branchiostegal spine runs parallel with that of its fellow, the spine being directed straight forward and distinctly shorter than the 2nd joint of the antennal peduncle; in Heteroc. laevigatus, on the contrary, the much larger spine projects by half its length beyond the 2nd joint of the antennal peduncle, reaching as far forward as the eyes, and its outer margin is distinctly curved inward. As regards the abdomen, both species fully agree with one another. The antennular peduncle reaches just beyond the middle of the antennal scale, the 2nd article is a little longer than the 3rd, and the stylocerite, the outer margin of which is concave, extends almost to the far end of the peduncle; the flagella are probably of equal length, 65 mm. long, nearly as long as carapace and rostrum combined. Antennal scale (Fig. 37) about half as long as the rostrum, distinctly narrowing anteriorly and about 31/3-times as long as broad, presenting its greatest width at the posterior fourth ; in Heteroc. gibbosus the antennal scale appears a little broader in proportion to its length and the outer margin appears a little more convex. Antennal flagellum 240 mm. long, twice as long as the body. The external maxillipeds, the terminal joint of which is almost i'^-times as long as the penultimate, project as far forward as the antennal scale; exopodite rudimentary, i1^ mm. long. Legs of the ist pair a little shorter than the external maxillipeds. The shorter stouter leg of the 2nd pair is placed on the right side-, carpus 7-jointed, the ist and the last joint of the same length and slightly shorter than the 5 other short and equal joints combined; chela little shorter, but broader than the carpus, fingers hardly shorter than the palm. While this leg extends only by the fingers beyond the antennal peduncle, its slender fellow reaches to the tip of the antennal scale. This species also differs from Heteroc. gibbosus Bate by the much shorter dactyli of the 3 posterior legs, which, as regards their other relative proportions, agree with this species. In a male of Heteroc. gibbosus from Stat. 256, that has about the same size as the male ot Heteroc. laevigatus, the propodus and the dactylus of the 3ld leg are respectively 14,5 mm. and 5,2 mm. long, in the male of Heteroc. lacvigatus, however, these numbers are 12,75 mm- and 2,4 mm., the dactyli (Fig. 37^) measuring in this species only about one-sixth, in Heteroc. gibbosus about one-third of the propodi ; in Heteroc. gibbosus the dactylus is slender, nearly 9-times as long as wide at base, and armed along the proximal half of its lower margin with 6 spinules, that increase in length from the ist, near the propodus, to the 6th ; in Heteroc. laevigatus it has a stouter shape (Fig. 37^), being only about 5-times as long as broad at its base, and there are only 5 spinules on the lower margin, that reach to beyond the middle, besides the spinule at the base of the claw, and these spinules are comparatively also slightly larger than in Heteroc. gibbosus. It is remarkable, indeed, that this character, by which the two species may so easily be distinguished, has hitherto been overlooked. Heteroc. laevis A. M.-Edw. is a different form, distinguished, besides by the characters mentioned at p. 164, by the rostrum proper being armed dorsally with 4 small teeth and by the branchiostegal spine being small and reaching less far forward than the orbital spine. iói General distribution: Off Banda Island (Spence Bate); Arabian Sea, off the Travancore coast (Alcock); East London, Cape Colony (Stebbing). 3. Heterocarpus tricarinatus Alcock & Anderson. PI. XIII and XIV, Fig. 38 — 38^. Heterocarpus tricarinatus A. Alcock & A. R. S. Anderson, Journal Asiatic Soc. Bengal, Vol. LXIII, pt. 2, 1894, p. 154. Heterocarpus tricarinatus A. Alcock, Descript. Catal. Indian Üeep-Sea Crustacea, Calcutta 1901, p. 107. Heterocarpus tricarinatus Th. R. R. Stebbing, in: Annals South African Museum, Vol. XV, London 1914, p. 39. Illustrations of the Zoology of the Investigator, Crustacea, Plate LI, Fig. 1. Stat. 208. Sept. 22. 5°39'S., 122° 12' E. South of Muna Island. 1886 m. Bottom solid green mud. 1 adult male and 1 young female. Stat. 211. Sept. 25. 5°4o'.7S., I20°45'.5 E. Entrance of the Gulf of Boni. 1158 m. Bottom coarse grey mud, superficial layer more liquid and brown. 1 young female. The adult male from Stat. 208 measures 119 mm. from tip of rostrum to end of telson, the rostrum, 27 mm. long, is ljw shorter than the carapace, which proves to be 30 mm. long, when measured from the orbital to the posterior margin; the abdomen, 62 mm. long, is but little longer than carapace and rostrum taken together. The whole body, except the thoracic legs and the pleopods, is covered with a close and fine tomentum. This specimen fully agrees with the figTire in the "Illustrations", except that the upper margin of the rostral teeth makes a distinct angle with that part of the upper border which is situated between two teeth, while in the figure that angle is not indicated. The upper margin of the rostrum is armed with 14 teeth, the 6th of which stands above the orbital margin, the lower with 1 1 . The abdominal terga, even the third, are described by Professor Alcock as quite smooth and non-carinate, I wish, however, to remark that the 3rd tergum (Fig. 38 #) shows on each side of the middle a shallow depression, that fades away towards the anterior and the posterior margin, so that the tergum looks at first sight as if it were very bluntly ridged, nearly as in Heteroc. giööosus Bate; this pseudo-ridge is, however, a little broader than in this species and less curved longitudinally : it is continued on the 4th and 5th somite, but 110 more visible on the 6th. Sixth somite one-fifth longer than fifth ; telson twice as long as 6th somite, nearly as long as the uropods, faintly grooved longitudinally and armed with 4 pairs of dorso-lateral spinules, besides those at the tip. The antennular peduncle reaches to the distal third of the scaphocerite, 2nd joint a little longer than 3rd; stylocerite acuminate, reaching to the far end of 2nd antennular article, with the outer margin concave and with a small blunt process at its base, like in other species; inner antennular flagellum about as long as the animal without the telson. Scaphocerite half as long as the carapace, 3-times as long as broad (Fig. 38^), presenting its greatest width at the proximal third and narrowing to the tip; terminal spine a little shorter than the distal tip of the lamella. Antennal flagellum one and a half as long as the entire length of the animal. The external maxillipeds project by half their terminal joint, which is one and a half as long as the penultimate, bevond the antennal scale; exopodite well-developed, reaching nearly to the middle of the antepenultimate joint of the endopodite. SIBOGA-EXPEDITIE XXXlXtf:1. 21 CQ IÓ2 First pair of legs distinctly shorter than the external maxillipeds, though still reaching beyond the antennal scale. Of the 2nd peraeopods the shorter and stouter one is situated on the right side; the carpus is 7-jointed, the ist or proximal joint, the longest of all, is almost half as long as the carpus, the 5 following are very short and subequal, the last half as long as the first; of the chela, which is but little shorter than the carpus, the palm appears distinctly broader than the distal joint of the latter and hardly longer than the fingers. The fingers of the other slender leg are as long as the palm. The legs of the 3rd pair (Fig. 3 8 f, 38^) project by their dactylus and propodus beyond the antennal scale, those of the 4th by their dactylus and three-fourths of the propodus, the much shorter legs of the 5"1 pair, finally, by little more than the dactylus; the dactyli measure one-third of the propodi and the spines with which these legs are armed on the lower border, are arranged in the 3rd and 4"1 pair in two rows, in the 5th pair only in one. The young specimen is about 58 mm. long, the rostrum is as long as the carapace, not shorter, both together a little shorter than the abdomen, which is 30 mm. long; the upper margin of the rostrum is armed with 15 teeth, 6 of which are on the carapace, the lower with 10. The depressions on each side of the middle of the 3rd tergum are already distinct, like on the 4"1 and 5th. The stylocerite reaches a little beyond the middle of 2nd antennular article, scaphocerite half as long as carapace. The external maxillipeds extend, like in the adult, about by half their terminal joint beyond the antennal scale, but the legs of the ist pair reach also by half their terminal joint beyond this appendage, being hardly shorter than the outer foot-jaws. Peraeopods of the 2nd pair as in the adult. The three following legs also like in the adult male, but the dactyli are a little longer than one-third of the propodi and the legs of the 5th pair project by their dactyli and three-fifths of their propodi beyond the antennal scale. The specimen from Stat. 211 is but little larger than the preceding, the carapace being 17 mm. long from the orbital to the posterior margin; the rostrum is broken off a little beyond the antennal scale, 5 teeth stand on the carapace, the 6lh just before the orbital margin. Abdomen and legs like in the young female from Stat. 208. Stylocerite not yet reaching the far end of 2nd antennular article. The nearest allied species is probably Heteroc. Alexandri A. M.-Edw. from Havannah, which according to Miss Rathbun occurs also off the Hawaiian Islands (M. J. Rathbun, in : II. S. Fish Commission Buil. for 1903, Part III, Wash. 1906, p. 918). This rare Heterocarpus is only known by the figure in the "Recueil de Figures de Crustacés nouveaux ou peu connus", published by A. Milne-Edwards in 1883, so that it is much to be regretted that no description at all was given by Miss Rathbun of the specimen, that she had the occasion to study. In this species, however, only four teeth of the rostral carina are placed on the carapace and the posterior tooth stands a little before the middle, in Heteroc. tricarinatiis, however, constantly behind the middle. The postantennal carina has completely disappeared. The 6th abdominal somite is more than twice as long as the 5th and but little shorter than the telson, the scapho- cerite, finally, has a different shape, appearing distally just as broad as at base. A closely allied form is no doubt also Heteroc. vicarius Faxon from the Gulf of Panama. In this species, however, the inferior lateral carina of the carapace reaches almost to the posterior i63 margin, the scaphocerite has a different form and the third maxilliped is not furnished with an exopodite, but merely with a small papilla on the outer side of the basipodite. General distribu tion: Arabian Sea (Alcock) ; East London, Cape Colony (Stebbing). 4. Heterocarpus gibbosus Bate. PI. XIV, Fig. 39 — 39^. Heterocarpus gibbosus C. Spence Bate, Report Challengcr Macrura, 1S88, p. 634, PI. CXII, fig. 2. Heterocarpus gibbosus J. Wood-Mason, in: Ann. Mag. Xat. Hist. 6. Ser., Vol. 9, May 1892, p. 368, 369, fig. 6. Heterocarpus gibbosus A. Alcock, Descript. Catal. Indian Deep-Sea Crustacea, Calcutta 1901, P- 103. Stat. 12. March 14. 7°i5'S., U5°is'.6E. Bali Sea. 289 m. Bottom mud and broken shells. 1 male and 4 females, one of which bears ova, while another lodges an Epicarid. Stat. 38. April 1. 7°35'.4S., ii7°28'.6E. Bali Sea. 521 m. Bottom coral. 5 males, most of which are young and 4 females, one of which is provided with eggs; this egg- bearing female and still a younger one are attacked by an Epicarid. Stat. 74. June 8. 5° 3'. 5 S., ii9°o'E. Southern entrance of the Strait of Makassar. 450 in. Bottom Globigerina ooze (obviously a thin layer). 3 full-grown males. Stat. 256. Dec. 11. 5°26'.6S., i32°32'.5E. Near the Kei-islands. 397 m. Bottom greyish green mud. 10 males and 1 1 females, nearly all adult, while 2 females are ova-bearing. Stat. 262. Dec. 18. 5°53'.8S., I32°48'.8 E. Off the Kei-islands. 560 m. Bottom solid bluish grey mud, upper layer more liquid and brown mud. 2 young specimens. The numerous specimens fully agree with the quoted descriptions and figures, but it must be observed that the dactyli of the three posterior legs, described by Col. Alcock as "very short", are indeed rather long (J. Wood-Mason, 1. c. Fig. 6), measuring one-third of the propodi (Fig. 39^ 39^). Form, length and direction of the rostrum vary rather much, like also the number of teeth with which the margins are armed (confer the figures). The carapacial carina, of which the height also varies considerably, is usually armed with 6 teeth, of which the 6th stands before the orbital margin, like in Wood-Mason's figure, rarely with 7 or 5 ; in case of 7 teeth, five or six, rarely four, stand on the carapace behind the posterior margin, in case of 5 teeth, four. The upper margin of the rostrum proper bears usually 2 or 3 teeth, rarely 1 or 4, and these teeth are much smaller than those of the carapacial carina. The lower margin has usually 12 — 14 teeth, rarely 11 or 15, in only one adult specimen 10 teeth were observed, in another 9, in a third S and in an adult male from Stat. 74 the lower margin bears but 6 teeth; the ventral teeth gradually decrease in size anteriorly and the 2 or 3 foremost ones are rudimentary. The rostrum is more or less strongly upcurved, so that the apex is some- times, especially in younger individuals, situated above the level of the teeth of the carapace, sometimes just as high, or below it. The outer aspect of the specimens appears therefore sometimes so difterent, that one is inclined to consider them as. different species. In an adult male from Stat. 74, of which the carapace measures 33 mm. from the orbital to the posterior margin and the rostrum 21,5 mm., the fifth abdominal somite, measured dorsally, proves to be 9 mm. long, the sixth 12 mm., the telson 21 mm., the terminal spines excluded, and the telson is still 1 mm. shorter than the uropods of the caudal fan ; in the largest ova- bearing female from Stat. 256 carapace and rostrum are respectively 35 and 25 mm. long, the 164 fifth somite of the abdomen 9 mm., the sixth 12 mm., the telson 20 mm. and the latter appears as long as the outer uropod and 0,5 mm. shorter than the inner. Telson armed with 4 pairs of dorso-lateral spinules, besides those at the tip. In the adult animal the antennal flagellum is 2y4-times as long as the body, the former measnring 300 mm., the latter 135 mm., both in a male and in an ova-bearing female, but in a female, long 125 mm., the flagellum measured 325 mm., 2,6-times as long as the body, and in a male, long 106 mm., it was 3-times as long, viz. 310 mm. One of the two young individuals from Stat. 262 is 73 mm. long and the youngest of all that were collected, the carapace is 15,5 mm., the rostrum 21,5 mm., the abdomen 36 mm. long, the latter thus as long as carapace and rostrum combined. The rostrum (Fig. 39^) is strongly curved upward, reaching far above the teeth of the carapace, slender and tapering to the acuminate tip ; the carapacial carina is armed with 6 teeth, of which the 4th is the largest, while the 5"1 and the 6th are placed before the orbital margin ; the rostrum proper carries more- over 2 smaller teeth on its proximal half, one opposite the 3rd antennular article, the other opposite the apex of the antennal scale. The 5th abdominal somite is 3,75 mm. long, the 6th 5,25 mm., the telson 9,75 mm. The external maxillipeds reach in this young specimen beyond the antennal scale by one-third of their terminal joint and their exopodite is still very small, rudimentary. The ist pair of legs, though shorter than the external maxillipeds, still just reach beyond the antennal scale, the carpus of the 3rd pair projects as far forward as the external maxillipeds, the carpus of the 4lh pair as far as the antennal scale, while the carpus of the 5th pair reaches to the distal third of the latter. As was already remarked by Spence Bate, Heteroc. laevis A. M.-Edw. from Martinique seems to be the nearest related form. In this species, however, the ist carapacial tooth stands a little before the middle of the carapace and the 3 or 4 posterior teeth are placed close together, there is, finally, no tracé visible of the two long lateral carinae, characteristic of Heteroc. gibbosus Bate. General distribution: Off Tablas Island (Bate); Andaman Sea, Bay of Bengal, Arabian Sea, off the Travancore coast (Alcock). 5. Heterocarpus Icpidus de Man. PI. XIV, Fig. 40 — 40^. Heterocarpus lepidus J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel III, Afl. 4, December 191 7, p. 282. Stat. 215a. Oct. 29. West 1000 m. distant from north point of Kabia-island reef. Banda Sea. 500 m. Bottom stone. 1 female without eggs. Stat. 262. Dec. 18. s°53'.8S., I32°48'.8E. Kei-islands. 560 m. Bottom solid bluish grey mud, upper layer more liquid and brown mud. 1 male. A new species pertaining to that Section of the genus, in which none of the abdominal terga are produced posteriorly into spines and in which the dactyli of the three posterior legs are very short. The two specimens of this species, which in its outer appearance closely resembles Heteroc. tricarinatus Alcock & Anderson, are nearly of the same size: the carapace of the i65 female, measured from the orbital to the posterior margin, proves to be 31,5 mm. long, the rostrum, measured in a straight line from the orbital margin to the apex, 32 mm., the abdomen 73,5 mm., entire length 137 mm.; in the male the carapace is also 31,5 mm. long, the abdomen 74 mm., but the rostrum is broken off just before the antennular peduncle. The carapace appears in a lateral view 22,5 mm. high, being nearly one and a half as long as high. The rostrum of the female, just as long as the carapace, is strongly recurved and continued as a high compressed carina on the gastric region, gradually fading away near the posterior margin. The gastric carina is armed with 5 equidistant teeth, of vvhich the ist, the smallest of all, stands a little behind the middle of the carapace and the 5"1 above the orbital margin; the rostrum proper bears 3 teeth, the ist above the eyes as far from the 5"' gastric tooth as this tooth from the 4"1, the 2nd opposite the far end of 2Dd antennular article, as far from the 1 st as the ist from the tooth above the orbital margin, the 3"1 a little beyond the middle, twice as far from the 2nd as the 2nd from the ist; the 3rd and the 4th tooth of the gastric carina are the largest, the following gradually diminish in size. Ventrally the rostrum is armed with 10 rather small teeth, of which the ist is placed between the ist and the 2nd of the upper margin, just beyond the eyes ; these teeth also gradually become smaller and the 6 anterior stand before the yd tooth of the upper margin. In the male the 5th tooth of the gastric carina stands just behind the orbital margin, the ist tooth of the rostrum proper is placed above the eye, the 2nd above the far end of ist antennular article, the 3rd, close to which the rostrum is broken, one and a half as far from the 2nd as the 2nd from the ist. As regards the carination of the carapace and the form and size of the two spines on the anterior margin, Hctcroc. lepidits does not differ from Heteroc. tricarinatus. The superior or postocular carina begins just behind the insertion of the eyestalk, one millimeter distant from the orbital margin, runs at first backward and a little downward, but curves just in front of the middle obliquely upward and fades away near the posterior margin of the carapace ; the orbital spine is small, not yet reaching as far forward as the basal process of the stylocerite, nor reaching to the posterior margin of the cornea of the eyestalk and is continued into a mere buttress instead of a well-developed carina. The branchiostegal spine has the same size as the preceding, but reaches not so far forward, namely only to the middle of the 2nd joint of the antennal peduncle; the inferior or postantennal carina is well-developed, but, like in Heteroc. tricarinatus , fades away on the anterior part of the branchial region. This description is taken from the female, in the male the postantennal carina is a little less prominent. The abdomen also fully resembles that of Heteroc. tricarinatus Alcock & Andersom Like in this species, in Heteroc. gibbosns Bate and in Heteroc. lacvigatus Bate, the 3ld abdominal tergum appears "bluntly carinated", owing to a depression on each side of the middle, that fades away near the anterior and the posterior margin of the somite; this "blunt carina" appears indeed somewhat convex both transversely and longitudinally and is as broad as in Heteroc. tricarinatus, somewhat broader than in the two other species, the width in the middle being about one-fourth of the length. Sixth somite in the male i^-times, in the female a little more than iYo-times as long as the fifth. Telson in the male slightly shorter, in the female a little longer than the 5'11 and the 6th somite taken together; in the male it is as long as the uropods, IÓ6 in the female a little shorter, slightly grooved longitudinally and there are 4 pairs of dorso- lateral spinules besides those at the tip. The two pairs of antennae also apparently agree with those of Heteroc. tricarinatus. In the female the stylocerite reaches just beyond the distal extremity of 2nd antennular article, in the male it is a little shorter than this article. Scaphocerite (Fig. 40^) in the female 15,6111111. long, 5 mm. broad, in the male these numbers are 16,5 mm. and 5,6 mm., the scaphocerite being half as long as the carapace and 3-times as long as wide; it has the same form as in Heteroc. tricarinatus, but the outer margin is more regularly curved, while in tricarinatus it is anteriorly slightly concave. The external maxillipeds, that bear a well-developed exopodite, extend in the female by two-thirds, in the male only by one-third of their terminal joint beyond the tip of the scaphocerite. The thoracic legs also resemble those of Heteroc. tricarinatus, as regards their relative proportions, except the dactyli, which in Heteroc. lepidus, like in Heteroc. lacvigatus, are considerably shorter and show a different form. The propodus and dactylus of 3rd legs (Fig. 40^, 40^) are respectively 20 mm. and 2,5 mm. long in the female from Stat. 215% 16 mm. and 2,5 mm. in the male from Stat. 262, the dactylus measuring in the male one- sixth, in the female one-eighth of the propodus; in the adult male of Heteroc. tricarinatus from Stat. 208, however, the propodus of 3rd leg is 15 mm. long, the dactylus 5 mm., the latter one-third of the propodus. The dactylus (Plate XIII, Fig. 38e/) of Heteroc. tricarinatus shows the same s 1 e n d e r form as in Heteroc. gibbosus Bate, while its form in this new species is the same as in Heteroc. laevigatus Bate, namely short and stout. In the female the peraeopods of the 3rd pair project by the dactylus, the propodus and three-fifths of the carpus beyond the antennal scale, in the male by the dactylus, the propodus and one-fifth of the carpus ; those of the 4th pair in the female by the dactylus, propodus and one-fourth of the carpus, in the male these legs are partly broken ; those of the 5th pair, finally, in the female by the dactylus and two-thirds of the propodus, in the male by the dactylus and half the propodus. Three other species, all from the Atlantic, are also more or less related to Heteroc. lepidus. Both in Heteroc. laevis A. M.-Edw. from Martinique and in Heteroc. Alexandri A. M.- Edw. from Havannah the ist tooth of the gastric carina stands anterior to the middle of the carapace, n e a r e r to the orbital than to the posterior margin ; in Heteroc. laevis the lateral carinae of the carapace are apparently wanting and the carpi of the three posterior legs are of a less slender shape, in Heteroc. Alexandri the postantennal carina seems to be wanting at all, the 6th somite of the abdomen is more than twice as long as the 5"1, the scapho- cerite does not narrow anteriorly, the dactyli, finally, of the three posterior legs are slender and elongate, all according to the figures of these species in the "Recueil de Figures de Crustacés nouveaux ou peu connus", published by A. Milne-Edwards in 1883. Heteroc. Gri/ualdii A. M.-Edw. and Bouv. from the Azores differs by the postantennal carina reaching almost to the posterior margin of the carapace and by the dorsal carina of the 3rd abdominal tergum terminating posteriorly into "une pointe saillante" (Buil. Soc. Zool. de France, T. XXV, 1900, p. 58). 167 6. Heterocarpus ensifer A. M.-Edw. var. parvispina de Man. PI. XIV, Fig. 41 — \\b. Heterocarpus ensifer A. M.-Edw. var. parvispina J. G. de Man, in: Zoolog. Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. Deel III, Afl. 4, December 1917, p. 282. For the typical species confer : Heterocarpus ensifer A. Milne-Edwards, in: Annal. Scienc. Nat. (6) XI, 1881, Art. N" 4, p. 8 and Recueil de Figures de Crustacés nouveaux ou peu connus, Avril 1883, PI. 32. Heterocarpus ensifer C. Spence Bate, Report Challenger Macrura, 1888, p. 638, PI. CXII, fig. 4. Heterocarpus ensifer W. Faxon, in: Buil. Mus. Comp. Zoology, Cambridge 1896, p. 161. Heterocarpus ensifer L. A. Borradaile, in : A. WlLLEV's Zoological Results. Part IV, Cambridge 1899, p. 413. Heterocarpus ensifer M. J. Rathbun, in: U.S. Fish Commission Bulletin for 1903, Part III, Wash. 1906, p. 917, PI. XXI, fig. 7. Heterocarpus ensifer H. Balss, Ostasiatische Decapoden II, München 19 14, p. 37. Pandalus carinatus S. I. Smith, Buil. Mus. Comp. Zoology, Vol. X, N° 1, Cambridge, 1882, p. 63, PI. X, figs. 2—2/, PI. XI, figs. 1—3. Stat. 38. April 1. 7°35'.4S., U7°28'.6E. Bali Sea. 521 m. Bottom coral. 1 young specimen. Stat. 105. july 4. 6°8'N., 121° 19' E. North of Sulu-island. 275 m. Coralbottom. 2 young specimens. Stat. 254. Dec. 10. 5°4o' S., i32°2Ó'E. Off the Kei-islands. 310 m. Bottom fine grey mud. 2 adult males. Heterocarpus ensifer A. M.-Edw., the hrst described species of this genus, differs from Heteroc. Sibogae de Man, with which it has hitherto been confounded, by the following. The carapace appears a little less high with regard to its length than in Heteroc. Sibogae: the carapace of the larger male from Stat. 254 is 24 mm. long and 17 mm. high, in a specimen of Heteroc. Sibogae from Stat. 74, however, these numbers are 26 mm. and 20,5 mm. The first tooth of the postrostral crest is constantly placed a little anterior to the middle of the carapace, in Heteroc. Sibogae, however, always d i s t i n c 1 1 y b e h i n d the middle. Posterior to the first tooth the crest runs straight backward, but appears more or less distinctly angular in Heteroc. Sibogae. The ist and the 2nd abdominal terga are not carinate, while in Heteroc. Sibogae both terga are provided with a high, prominent and sharp carina. In full-grown specimens, however, like in the two males from Stat. 254, the ist tergum does not appear regularly rounded, vvhen looked at from behind, but slightly angular, the angle, however, is rounded and smooth. On the 2nd tergum this angle is hardly visible, so that this tergum appears almost regularly rounded. Figures of Heteroc. ensifer A. M.-Edw. have been published by A. Milne-Edwards, Spence Bate and Miss Rathbun (locis citatis), but in all these figures the spine, into which the carina of the 4th tergum is produced, appears but little shorter than the spine of the 3rd. In the five specimens, however, that were collected by the "Siboga", the spine of the 4th tergum is considerably smaller than that of the 3vd, its length being only one-fourth the length of the latter, when measured from the posterior margin of the somites: it is only on account of this dirïerence that these specimens are regarded as a distinct variety. Spence Bate (1. c. p. 639) remarks about the two males, trawled by the "Challenger" between the Philippine Islands and Borneo, that the spine of the fourth tergum, "is not quite so large as that on the i68 preceding somite", which words no doubt imply that the difference of length was not great in his specimens and in the beautiful photograph of a specimen from the Hawaiian Islands (Rathbun, 1. c.) the spine of the 4* tergum appears more than half as long as that of the 3rd. The species, observed and photographed by the renowned american carcinologist, belongs, however, certainly to the typical ensifer, because Miss Rathbun had the opportunity of comparing her Hawaiian specimens with a fair-sized individual from the Caribbean Sea. For the rest our specimens apparently fully agree with the typical species. The larger male from the Kei-islands measures 98 mm. from tip of rostrum to end of telson and has the size indicated by Milne-Edwards : unfortunately Miss Rathbun did not mention the size of the specimens that she had observed and the numbers, mentioned by Spence Bate, are again a mistake (entire length 64 mm. (2,5 inch), length of carapace 21 mm., of rostrum 23 mm., of pleon 43!). In the specimen from Stat. 38, the carapace of which is 16 mm. long, the rostrum is broken off near the tip of the antennal scales, but in the other specimens the postrostral crest and the rostrum are armed dorsally with 16 or 17 teeth, five of which stand on the carapace, while the lower margin has 9 teeth ; in form and size these teeth resemble those of Heteroc. Sibogae. In the larger male from the Kei-islands the rostrum is slightly shorter than the carapace, in the other just as long and in the two young specimens from Stat. 105 the carapace is distinctly shorter than the rostrum ; in the two adult males the apex is not or scarcely situated above the level of the postrostral crest, but in the two young specimens from Sulu Island rather much. Excepting the differences described above, the abdomen agrees for the rest with that of Heteroc. Sibogae: like in this species there are on the ist tergum on each side two small tubercles situated above one another and the telson is armed likewise with 4 pairs of dorso- lateral spinules besides those at the tip ; the relationship between these two species is also proved by the fact that of these 4 pairs of spinules the 2nd and 3rd pair are in both farther distant from one another than the ist from the 2nd or the 3"' from the 4th. As regards the two pairs of antennae and the legs, both species seem to agree with one another, but the dactyli of the three posterior legs are a little shorter in proportion to the propodi, measuring in the adult male not yet one-third of the penultimate joints. So are in the larger male from Stat. 254 the propodi of the yd pair 9,2 mm. long, the dactyli 2,6 mm., in the younger male, like in the young specimens from Stat. 105, they measure just one-third of the propodi ; in Miss Rathbun's photograph of a specimen from Hawaii (1. c.) the dactyli appear also distinctly shorter than one-third of the propodi. In the adult Heteroc. Sibogae, however, the dactyli are constantly longer than one-third of these joints and in younger indivi- duals measure even slightly more than two-fifths of the propodi. T a b 1 e of Measurements in millimeters: 1234 Carapace . . 13,5 13 24 22,5 Rostrum . . , 17,5 17 ^ 22,5 ! 22,5 5555 Formula • •—■., FT" X" 1 and 2 Stat. 105; Nu 3 and 4 Stat. 254. 169 General distribution: The typical Hcleroc. ensifer A. M.-Edw. was discovered off the island of Barbados, West-Indies, was taken by the "Blake" off the islands of St. Kitts, Montserrat and Grenada and, according to S. I. Smith, occurs also off the coast of Carolina; it is furthermore known from the Hawaiian Islands, where this species is one of the most abundant of deep-water shrimps (Rathbun), from Xew Britain (Borradaile), from between the Philippine Islands and Borneo (Spence Bate) and from Sagami Bay, Japan (Balss). The variety parvispina is still only known from the Indian Archipelago. 7. Heierocarpus Sibogae de Man. PI. XIY, Fig. 42 — 42/. Hcterocarpus sibogae J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden, Dl. III, Afl. 4, 1917, p. 2S3. Hcterocarpus ensifer A. Alcock, Descript. Catal. Indian Deep-Sea Crustacea, Calcutta, 1901, p. 107. Stat. 12. March 14. 7°i5'S., U5°I5'.6E. Bali Sea. 289 m. Bottom mud and broken shells. 10 adult specimens, viz. 4 males and 6 females, 5 of which are ova-bearing. Stat. 38. April 1. 70 35'.4 S., U7°28'.6E. Bali Sea. 521 m. Bottom coral. 9 young specimens. Stat. 74. June 8. 5°3'.5S., H9°o'E. Southern entrance of Strait of Makassar. 450 m. Bottom Globigerina ooze. 6 specimens, viz. 1 adult male, 1 ova-bearing female and 4 young individuals. Stat. 139. Aug. 4. O0 1 1' S., I27°25' E. North of Batjan. 397 m. Bottom mud, stones and coral. 3 adult males and 2 ova-bearing females. Stat. 212. Sept. 26. 5°54'.5S., 120° 19'. 2 E. West of Saleyer. 462 m. 2 adult females, one of which with eggs. Stat. 256. Dec. 11. 5°2Ó'.6S., I32°32'.5E. Kei-islands. 397 m. Bottom greyish green mud. 8 adult specimens, viz. 3 males and 5 females, 3 of which are egg-bearing. Stat. 262. Dec. 18. 5°53'.8S., I32°48'.8E. Kei-islands. 560111. Bottom solid bluish grey mud, upper layer more liquid and brown mud. 2 adult ova-bearing females. Stat. 316. Febr. 19, 1900. 7°i9'.4S., Ei6°49'.5E. Bali Sea. 538 m. 1 ova-bearing female. This interesting new Hcterocarpus, of which no less than 42 specimens were collected, both adult and young, much resembles Hcleroc. ensifer A. M.-Edw. (A. Milne-Edwards, Recueil de Figures de Crustacés nouveaux ou peu connus, 1883, PI. 32 and M. J. Rathbun, in: U.S. Fish Commission Buil. for 1903, Part III, Wash. 1906, p. 917, PI. XXI, fig. 7), as regards the shape of the carapace and its carination, but is easily distinguished by the sharp carinae of the ist and 2nd abdominal ter ga. Heierocarpus Sibogae attains the length of 140 mm., both male and female, while the carapace and rostrum combined are but little shorter than the abdomen. In the adult species the rostrum, measured in a straight line from the orbital margin to the apex, appears as a rule one-fifth to almost one-third shorter than the carapace between the orbital and the posterior margin, rarely of equal length, though never longer than the carapace (Table of Measurements) ; in the adult female from Stat. 316 which is already provided with eggs, though not vet full-grown, as it is only 1 10 mm. long, the rostrum is 2,5 mm. longer than the carapace and in still younger specimens, as in those from the Stations 38 and 74, the rostrum is distinctly, to about one- third, longer than it. The postrostral crest, which commences near the posterior margin of the carapace, is more or less curved, while the upper margin of the rostrum proper runs first SIEOGA- EXPEDITIE XXXIX ö3. 22 downward and then more or less upward, so that the apex is sometimes placed at a higher level than the postrostral crest, sometimes at the same, sometimes, however, at a lower level. Posterior to the ist tooth the postrostral crest is not regularly curved, but appears more or less distinctly angular and the angle is usually situated twice as far from the ist tooth as from the proximal extremity of the crest. Postrostral crest and rostrum armed dorsally with 15 — 19 teeth, usually 16, rarely 12, 14 or 20, ventrally with 10 — 12 teeth, rarely 6 — 9 or 14. First tooth constantly a little posterior to the middle, at about two-hfths the length of the carapace from the posterior margin ; this tooth is very small, the following become gradually larger to the 5th or the 6th, which is the largest, and then again gradually diminish in size, so that the 2 or 3 foremost teeth (also on the lower margin) are rudimentary, almost invisible. Five teeth stand usually on the carapace, the 6th above the orbital margin, rarely four or six are placed on it. The rostrum of the full-grown ova-bearing female from Stat. 139 (N° 25 of the Table) shows an abnormal shape and is probably regenerated ; 6 teeth stand on the carapace, the 7Ul just before the orbital margin. The rostrum, little more than half as long as the carapace, reaches hardly to the end of the antennal scales and projects horizontally forward, the tip hardly upturned. The foremost tooth of the upper margin stands just in the middle of it, while the teeth of the lower are crowded on its distal half, except the first (Fig. 42 c). For the rest as regards form and carination of the carapace, this species does not seem to differ from Hetcroc. ensifer A. M.-Edw. The ist abdominal tergum (Fig. 42^) bears a rather high, prominent and very sharp carina that ends posteriorly abruptly, while the anterior margin is sloping and oblique; on each side of this carina are two small rounded tubercles, of which the superior is situated a little nearer to the carina than to the inferior, and a little below the latter there is a curved ridge, the lower boundary of the tergum. Second abdominal terguin likewise provided with a high, prominent and sharp carina ; the straight upper edge of this carina makes usually a right angle with the anterior, but an acute angle with the posterior margin of the crest, so that the posterior extremity of the latter appears more or less dentiform ; this is sometimes also the case with the anterior, though the extremities are never sharp. Third and fourth terga also sharply carinate and produced posteriorly into a sharp spine ; the two spines are of equal length and large, the spine of the 3rd tergum r each ing to the middle ol the 4th, that of the 4lh to the posterior margin of the 5th; the carina both of the 3rd and of the 4th tergum are slightly curved, that of the 4,h commencing a little behind the anterior margin. The 5th and the 6th somite like also the telson closely resemble those of Heteroc. ensifer A. M.-Edw.; the 5th and the 6th somite are rounded dorsally, the 6th one and a half as long as the 5th or a little less and both somites combined are as long as the telson, which is faintly grooved longitudinally, armed with 4 pairs of dorso-lateral spinules besides those at the tip, and nearly as long as the uropods. As regards the two pairs of antennae this species resembles Heteroc. ensifer A. M.-Edw. and this is also the case with the thoracic legs, except that the dactyli of the three posterior legs are somewhat longer in proportion to the propodi. 171 The external maxillipeds that bear a well-developed exopodite, extend to the distal third or fourth of the antennal scale and the legs of the ist pair are but little shorter. Shorter leg of the 2m1 pair either on the right or on the left side. The peraeopods of the 3rd pair (Fig. 42 d, 42/ and 42/1) are nearly as long as the antennal scales, while the following become gradually a little shorter. The dactyli of the 3"' pair measure in adult specimens (lig. 42c, 42^), both male and female, a little more than on e- third of the propodi, in young individuals (Fig. 42/) ■of which the carapace is 23 mm. long, even slightly more than two-hfths; they are almost 6-times as long as broad at base and armed along the proximal half of their posterior margin with 4 or 5 rather stout spinules that slightly increase in length from the ist or proximal to the last. So e. g. in an adult male from Stat. 12 the propodus of the 3rd legs is 10,5 mm. long, the dactylus 3,8 mm. long and 0,68 mm. broad at base, in an adult ova-bearing female from the same Station these numbers are, in the same succession, 10,8 mm., 4,1 mm. and 0,7 mm., in a young individual, finally, from Stat. 74, of which the carapace is 23 mm. long, j j mm., 3,3 mm. and 0,48 mm. The female from Stat. 3 1 6 proves that this species is already provided with eggs, when it still only measures 1 10 mm. T a b 1 e of Measurements in millimeters. Carapace . Rostrum . Formula . I 2 3 4 5 6 7 8 9 IO 11 12 13 32,5 32 29 3'. S 31 30,5 27 26 '9 18,5 iS 18 18 25 24.5 22,5 24 25 26 26 25.5 24 23>5 24 22,5 22,5 5 1 5 li 1 a 5 5 1 5 -1 1 ti 5 1 8 5 1 !• s 1 e 5 1 T 5 1 5 5 1 9 5 1 !) 5 1 8 7 9 !) 7 1 1 ;t 1 0 1 0 1 l 1 1 1 1 1 1 1 2 Carapace Rostrum Formula 14 15 16 17 18 19 20 21 22 23 24 25 26 16,5 16 16 33 32,5 26 24 15 C '9.5 31.5 30 35 27 22,5 23 21 27 27 29 25.5 28,5 27 22,5 22 21 26 5 1 9 5 1 8 8 1 8 5 1 7 5 1 4 5 1 6 5 1 7 5 1 K 5 1 6 5 1 4 4 1 2 6 '.1 5 1 8 1 I 1 1 1 -• 1 1 1 0 1 0 1 1 I 2 1 2 6 7 1 0 1 0 27 28 29 3° 30 26 3', 5 29 25 26,5 24.5 23Ó 5 1 9 1 1 5 1 8 1 1 5 1 e 1 0 5 1 6 8 31 32 33 34 35 36 37 38 24.5 1 1 3J 32 31 31 26,5 31.5 24 25.5 29 29 25.5 26 24 25.5 26,5 5 1 6 5 1 9 ó 1 8 5 1 !) 5 1 6 5 1 6 5 16 5 2 0 1 1 1 _' 1 1 1 2 1 .' 1 L' 1 0 1 1 Carapace Rostrum Formula N° 1—8 Stat. 12, N" 1 — 3 males, N° 4 — 7 ova-bearing females, N° 8 female without eggs-, N° 9 — 16 Stat. 38, all young; N° 17 — 22 Stat. 74, N° 17 ova-bearing female, N° 18 adult male, N° 19 — 22 young specimens; N° 23 — 26 Stat. 139, N" 23, 24 adult males, N° 25, 26 ova-bearing females; NIJ 27 and 28 females from Stat. 212, the latter with eggs-, N° 29 — 36 Stat. 256, N° 29 — 31 males, N" 32 — 34 females with eggs, N° 35 and 36 females without eggs (N° 31 bears a Bopyrid in the left branchial chamber); N° 37 egg-bearing female from Stat. 262; N° 38 egg-bearing female from Stat. 316. 8. Heterocarpus dorsalis Bate. PI. XV, Fig. 43 — 43^. Heterocarpus dorsalis C. Spence Bate, Report Challenger Macrura, 1888, p. 630, PI. CXI. ? Heterocarpus Alphonsi C. Spence Bate, 1. c. 1888, p. 632, PI. CXII, fig. 1. ? Heterocarpus alphonsi A. Alcock, Descript. Catal. Indian Deep-Sea Crustacea, 1901, p. 106. ? Heterocarpus Alphonsi Th. R. R. Stebbing, Annals South African Museum, Vol. XV, London, 1914, p. 40. Stat. 38. April 1. 7°35'.4S., U7°28'.6E. Bali Sea. 521 m. Bottom coral. 2 males and 4 females, 2 of which are ova-bearing; nearly all the specimens are adult. Stat. 45. April 6. 70 24' S., u8°i5'.2E. Flores Sea. 794111. Bottom fine grey mud, with some radiolariae and diatomes. 15 specimens, 7 of which are adult males, the rest young specimens. Stat. 85. June 17. o°36'.5 S., ii9°29'.5 E. Strait of Makassar. 724 m. Bottom fine, grey mud. 2 males, one of which is full-grown, the other of medium size. Stat. 122. July 17. i°58'.5N., i25°o'.5 E. North of Menado. 1264— 1165 m. Bottom stone, 3 ova-bearing females and 1 male, all of medium size. Stat. 178. Sept. 2. 2°4o'S., I28°37'.5E. Ceram Sea. 835 m. Bottom blue mud. 2 young specimens. Stat. 211. Sept. 25. 5°4o'.7S., i20°45'.S E. Entrance of Gulf of Boni. 1158 m. Bottom coarse grey mud, superficial layer more liquid and brown. 1 young specimen. Stat. 267. Dec. 20. 50 54' S., I32°s6'.7E. Kei-islands. 984 m. Bottom grey mud with a brown upper layer. 1 female without eggs. Stat. 297. January 27, 1900. io°39'S., I23°40'E. East of Rotti. 520 m. Bottom soft, grey mud with brown upper layer. 1 male. Stat. 300. January 30, 1900. I0°48'.6S., I23°23'.iE. East of Rotti. 918 m. Bottom fine, grey mud. 1 egg-bearing female. Stat. 314. Febr. 17, 1900. 7°36'S., H7°3o'.8E. Bali Sea. 694 m. Bottom fine, sandy mud. 26 specimens, viz. 9 adult or almost adult males, 3 adult ova-bearing females and 17 young specimens. Stat. 316. Febr. 19, 1900. 7°i9'.4S., u6°49'.5E. Bali Sea. 538 m. Bottom fine, dark brown sandy mud. 7 specimens, all adult excepting one, viz. 3 males and 3 females, 2 of which are laden with eggs. Of this apparently common deep-sea species, that was founded on two females taken by the "Challenger" off Banda Island, no less than 65 specimens were obtained by the "Siboga", full-grown males, ova-bearing females and young individuals of different size, in various parts of the Indian Archipelago. This large and well-preserved material enables me to augment our knowledge of this interesting species. The 6 specimens from Stat. 38 are full-grown; in the largest male the carapace, measured between the orbital and the posterior margin, proves to be 34,5 mm. long, the rostrum from the orbital margin in a straight line to the apex 32,5 mm., the abdomen 83 mm., entire length 150 mm., in the largest ova-bearing female these numbers are in the same succession 36,5 mm., 36 mm., 92,5 mm. and 165 mm. The carapace, one and a half as long as high, is covered, like the rostrum and the abdomen, with a short tomentum. In the younger male, of which the carapace is 26,5 mm. long, the rostrum is one-fourth Jonger than the carapace, namely 33 mm., and appears hardly more recurved than in Bate's fïgure 19 on Plate CXI; it is armed, both dorsally and ventrally, with 14 teeth, that reach to the tip, gradually decreasing in size; three teeth stand on the carapace, the ist just in front of the middle, the 3rd just behind the orbital margin and the 2nd tooth is but half as far dista'nt from the ist as from the 3"1. In the females taken by the "Challenger" only two teeth were placed on the carapace, the 3rd above the eyes and the teeth of the rostrum proper were farther distant from one another than in this male — but in other specimens of this collection, like in those from the Stations '/ ó 122, 178 and 300, the rostrum agrees with that of the Challenger types. In the larger male the rostrum is xi-dentate, two millimeters short er than the carapace, as much recurved as in Bate's figure and the 3rd tooth of the gastric carina, which is but little farther distant from the 2ml as the 2"d from the ist, is placed above the orbital margin. In a female without eggs, in which the carapace is 31,5 mm. long, the rostrum is 34,5 mm. long and a little more recurved than in the figure of Bate, three teeth stand on the carapace, but those of the proximal half of the upper margin are as far remote from one another as in the Challenger types, the 2nd tooth of the rostrum proper being placed opposite the distal extremity of the antennular peduncle; the rostrum is rl-dentate. In the other adult specimens, however, the rostrum is nearly as long as the carapace, more strongly recurved than in the Challenger types, 3 teeth stand on the carapace and the rostral formulae are -ff, H and xf- The gastric carina is quite conspicuous in this species and (Fig. 43^) bears a small tubercle posteriorly, not always distinct, however, just before uniting with the transverse carina that joins the posterior extremities of the post-ocular carinae and that runs parallel with the posterior margin. There is also on the gastric carina a small elongate impression or pit, situated on the cardiac region, twice as far distant from the ist tooth as from the described terminal tubercle. Like in Heteroc. laevigatus Bate one observes, between the posterior extremity of the post-antennal carina and the postero- lateral curved angle of the carapace, a short curved carina that fades away at the level of the coxa of the 5th pair of legs. The orbital spine reaches to the eyes, the strong branchiostegal spine is flattened above, reaches as far forward as the other, sometimes even a little farther and projects beyond the 2nd joint of the antennal peduncle, when the carapace is looked at from above. Though the ist and 2nd abdominal terga are described as smooth, it should, however, be remarked that the ibt tergum (Fig. 43 f) carries a transverse row of four more or less prominent, small tubercles, two on each side of the middle ; these four prominences are not mentioned by Spence Bate, nor visible even in his magnified figure 2, but two small similar prominences, that occur on each side of the 2nd somite, there where the tergum passes into the pleura, are distinctly visible in the figure 1 9- Concerning the following somites, it should be remarked that the carina of the 3ld tergum is longitudinally fluted and that it is not regularly arched in a lateral view, like in Bate's figure 1 9, but that the anterior half makes a very obtuse angle with the posterior, which angle, however, is rounded and not dentiform as in Heteroc. hostilis Faxon and afjlnis Faxon from the west coast of Central America, and furthermore that the three spines slightly increase in length from the spine of the 3rd to that of the 5"1 tergum. Exclusive of the spine the 5th tergum measures two-thirds the length of the 6th, but inclusive of it the 6th tergum appears but little longer than the 5"1, while the telson is as long as the 6th and the 5lb somite combined, the latter without the spine; 6lh somite and telson dorsally grooved, telson with 3 pairs of dorso-lateral spinules besides those at the tip, telson as long as the uropods. The stylocerite which is acuminate and provided with a basal process, reaches to the middle or almost to the middle of the 2nd antennular article, 3rd article a little shorter than 2nd; inner flagellum of the adult female as long as carapace and rostrum combined, outer a little shorter. '74 Scaphocerite (Fig. 430) a little more than half as long as the carapace and 3-times as long as wide, outer margin slightly convex, for the rest resembling Bate's figure c: in the larger male the carapac© is 34,5 mm. long, the scaphocerite 20 mm. long and 6,7 mm. broad, in an adult ova-bearing female these numbers are 36,5 mm., 22,2 mm. and 7,1 mm. Antennal flagellum of the adult male 300 mm. long, twice as long as the body. The external maxillipeds reach nearly, both in the male and in the female, as far forward as the antennal scale. According to Spence Bate the exopodite should be reduced to a tubercle, in these specimens, however, a very short, rudimentary exopodite really occurs, measuring 1L or '/8 the length of the long antepenultimate joint : in one of the ova-bearing females it is wanting on the left side, which fact indicates that this appendage is sometimes worn off or lost, as was evidently also the case in the two females taken by the "Challenger". Peraeopods of the 1 st pair a little shorter than the external maxillipeds, reaching by the carpus as far forward as the antennal peduncle. Shorter leg of the 2nd pair, either on the right or on the left side, little longer than the antennal peduncle; carpus 11-jointed, ist joint as long as 2nd and 3rd combined, 3rd one and a half as long as 2nd, 4th nearly as long as 3vd, 5th — ioth short, equal, a little shorter than 2"d, last joint as long as ist; fingers a little shorter than the palm, which is slightly broader than the last joint of the carpus. The other slender leg appears, in the larger male, as long as the external maxillipeds, while in the adult ova-bearing female it projects by the chela and one-sixth of the carpus beyond the antennal scale; the carpus consists in the larger male of 26, in the adult females of 29 — 34 joints, ist and last joint a little longer than the others, chela as long as the two last joints combined, not broader than carpus, fingers as long as the palm. The legs of the 3rd pair reach by the whole length of the dactyli or hardly more beyond the tip of the antennal scale, the 4th are a little shorter, those of the 5th pair are again a little shorter and extend to the far end of the propodi of the 3rd pair. The dactyli are slender, long, and measure two-fifths to one-third of the propodi, in adult specimens. In two of the 7 adult males from Stat. 45 the rostrum is broken at the tip. Three teeth stand on the carapace or the 3rd above the orbital margin and always the 2nd is placed nearer to the ist than to the 3rd. In these adult males the rostrum is just as long as the carapace or a little longer, in one specimen (N° 9 of the Table), however, slightly shorter and in all these males it is as much turned upwards as in the Challenger type or hardly more, but not so strongly recurved as in the adult females from Stat. 38. In the younger specimens the rostrum is comparatively longer, like in other species, in N° 12 the carapace is 26 mm. long, the rostrum 32 mm., in younger ones it is one and a half as long as the carapace and in the two youngest individuals, of which the carapace measures 9 mm., the rostrum is more than twice as long; in these young individuals it is a little more upturned than in Bate's figure and the teeth, especially those of the upper margin, are comparatively longer and slenderer than in the adult animal. Even in the youngest individuals the anterior half of the carina of the 3111 abdominal somite appears already grooved, while on the ist tergum the 4 tubercles are already visible. The larger male from Stat. 85 is 154 mm. long, rostrum one-fifth longer than the carapace, as much recurved as in Bate's figure, in the other it is somewhat more recurved; ■75 while in the former 3 teeth stand on the carapace, in the younger male the 3rd tooth is placed above the orbital margin. In both the subterminal tubercle of the carapacial carina is present. The youngest of the three ova-bearing females, taken north of Menado, is of much interest, not only on account of its small size, this specimen being only 113 mm. long, so that we may conclude that at this age Heteroc. dorsalis bears already eggs, but also on account of the following. The slender, tapering and pointed rostrum, a little more than one and a half as long as the carapace, is as much upturned as in the Challenger type and, like in Bate's female, the 3rd tooth is placed above the eye, a little in front of the orbital margin, but the 2,ul tooth is almost twice as far distant from the 3rd as from the ist; in one of the two other ova-bearing females that are of equal size, the 3ld tooth stands just beyond the orbital margin, but the 2nd is placed midway between the is' and the 3"1, in the male, however, the 3rd tooth is placed like in the youngest female and the 2nd is almost one and a half as far distant from the 3rd as from the [st. In these specimens the teeth of the upper margin are as far distant from one another as in the Challenger type. Of the larger specimen from Stat. 178 the carapace is 18,5 mm. long, the rostrum is incomplete, but the proximal teeth of the upper margin stand like in the Challenger type and the 2nd tooth is hardly farther distant from the 3"1 above the eye than from the ist; in this specimen the branchiostegal spine reaches not so far forward as the orbital spine, though beyond the 2nd joint of the antennal peduncle. In the other specimen the rostrum is twice as long as the carapace and the 3rd tooth stands also just beyond the orbital margin; the 4 tubercles on the ist abdominal somite are already present. In the very young individual from Stat. 211 the rostrum is more than twice as long as the carapace, little upturned and 3 teeth stand on the latter; like in other young specimens the foremost tooth of the upper margin is placed not far from the extremity of the rostrum, almost 4-times as far distant from the penultimate as from the extremity and so small that it may easily be overlooked. The rostrum of the female of medium size from the Kei-islands is strongly recurved and a little more than one-third longer than the carapace; three teeth on the carapace, the 4th just beyond the orbital margin. Dactyli of 3rd legs almost half as long as the propodi (4 mm., 8,5 mm.). The male from Stat. 297 is almost full-grown. Of the 14 teeth of the moderately upcurved rostrum three stand on the carapace, the 2nd midway between the ist and the 3rd and the two foremost teeth are rudimentary, almost invisible. Dactyli of the three posterior legs almost half as long as the propodi, those of the 3rd pair 4,5 mm. long, the propodi 10,5 mm. The egg-laden female from Stat. 300 (Fig. 43/) is also nearly full-grown, the rostrum closely resembles that of the Challenger type; 3ld tooth above the eye, twice as far distant from the 2nd as the 2nd from the ist, teeth of the upper margin as far distant as in Bate's female, foremost tooth near apex rudimentary. Also as regards the proportion between the length of carapace and rostrum, which is according to Spence Bate like 5:7, this female agrees with the type. (It was, of course, a slip of the pen, when 80 mm. (3,1 inch) were indicated as the entire length, while carapace, rostrum and abdomen are described as 25 mm., 35 mm. and 55 mm. long.) 176 ** ts^r-ï The numerous specimens from Stat. 314 resemble those from the Stations 38 and 45, the rostrum being moderately recurved in the adult males, more strongly in the adult ova- bearing females; in these adult specimens it is nearly as long as the carapace, or a little to one-third longer, or, as in the adult ova-bearing female (N° 37) slightly shorter, in the younger specimens one and a half to twice as long. The adult male (N° 47) from Stat. 316 differs from all the other specimens by the small number of teeth on the rostrum and should be considered as an exception. The rostrum, a little shorter than the carapace, is very little upturned, so that the apex is situated at the same level as the carapace. There are but 7 teeth on the upper margin, besides a rudimentary tooth in front of the foremost one; 3 teeth stand on the 'carapace, the 2ml twice as far from the yd as from the ist, while the 7th is placed a little behind the tip of the antennal scale; lower margin only with 6 teeth. In the much younger male (N° 48) also only 9 teeth are observed both on the upper and the lower margin, the teeth are as far distant from one another as in Bate's figure 1 9, but the rostrum is a little more upturned and, as usual, 3 teeth stand on the carapace, the 2nd twice as far from the 3vd as from the ist; it is one-fourth longer than the carapace. In the females the rostrum is more strongly recurved than in the Challenger type, in the largest female one-fourth longer than the carapace. We may conclude from the measurements of 53 specimens, which are indicated in the Table, that in adult individuals of Heteroc. dorsalis Bate the rostrum is nearly as long as the carapace, either a little shorter or longer, or distinctly longer, to almost one and a half as long as the carapace and that in younger specimens it appears considerably longer, to even a little more than twice the length of the carapace. The Table also teaches us, that the rostrum is usually armed dorsally with 12 — 14, ventrally with 11 — 14 teeth, more rarely io or 11 teeth occur on the upper margin, and, as very rare exceptions, 7 or 9 or 15 or 16 teeth were observed on the upper margin, 6 or 8 or 9 or 1 5 on the lower. The two females from off Banda Island, on which this species was founded by Spence Bate, should therefore be regarded as such a rare exception, because the upper margin was armed with 8 and the lower with 7 teeth. Usually three teeth stand on the carapace, posterior to the orbital margin, about in 80 per cent of the specimens, more rarely two and in this case the 3rd tooth is often placed above the orbital margin: specimens, however, in which, like in the Challenger types, the 3rd tooth stands above the eyes, were also obtained by the "Siboga". As a conspicuous and constant feature of this species the four tube re les must be considered, which in a trans ver se row occur on the tergum of ist abdominal somite. I am not quite sure, whether Heteroc. Alphonsi Bate, taken by the "Challenger" south of the Philippines and off Japan, is a distinct species or not. According to the author of the Report on the Challenger Macrura the rostrum should be one and three-fourths longer than the carapace, but the measurements of the female and the male, mentioned by him on p. 633, agree with those of Heteroc. dorsalis, the rostrum being only one-third or one-fourth longer than the carapace — they show likewise the same slip of the pen, for the entire indicated length is only the length of the rostrum and the abdomen combined ! In Bate's description / / the orbital spine is described as "a strong tooth", and then follows "the infero-lateral angle is also armed with a short tooth", and on p. 634 it says that this "short" tooth is long! It is also remarkable that the author compares both Heter oc. dorsalis and Heter oc. AlpJionsi with Heteroc. oryx A. M.-Edw., but not in ter se, and one becomes inclined to think that the descriptions of the two species have been made a long time after one another and that the author, when describing the second species, had forgotten the description of the former. I not succeed in finding any good character, by which Heteroc. Alphonsi should differ from Heteroc. dorsalis. Nevertheless, according to Alcock, the rostrum of Heteroc. AlpJionsi should measure indeed "about i^-times the length of the carapace proper" in the adult animal and it should be armed dorsally with nine or ten teeth, two of which should stand on the carapace, and ventrally with ten to thirteen, but for the rest also Alcock's description mentions no character, by which both forms could be distinguished. Heteroc. Alphonsi Bate must therefore probably be considered as a variety of Heteroc. dorsalis, distinguished by the longer rostrum and by the upper margin being as a rule only armed with 9 or 10 teeth, two of which stand on the carapace. T a b 1 e of Measurements in millimeters. Length of carapace . . Length of rostrum. . . Rostral formula Length of carapace . Length of rostrum. . Rostral formula I 2 3 4 5 6 7 8 9 10 1 1 34.5 26,5 36,5 35.5 36 31,5 34 32,5 32 31 29,5 32,5 33 36 36 36,5 34-5 34 32,5 30,5 34 35 1 3 3 1 1 3 1 3 3 1 1 3 1 6 3 1 1 2 1 2 3 1 0 3 12 1 3 3 1 * 1 3 1 1 1 5 1 3 1 3 1 3 1 1 1 1 1 3 1 1 1 4 12 13 ■ 4 15 16 17 18 19 20 21 22 26 22,5 20,5 16,5 13 9 8,5 32,5 27 25 24.5 32 33 30.5 31.5 24 23 18 38,5 37,5 34 36,5 3 1 5 3 1 4 3 1 1 il 3 1 3 >> 1 3 2 1 0 3 1 4 2 1 3 2 1 0 3 1 1 1 2 1 i 1 2 1 3 1 2 1 4 1 1 1 3 14 1 1 1 2 Length of carapace Length of rostrum Rostral formula 23 24 25 26 27 28 29 30 31 32 33 21 I I 9.5 21 27.5 28,5 32 32 31 3' 30,5 35,5 22,5 21 29.5 35 40,5 31.5 32,5 32 33 34 2 1 0 10 3 1 0 3 11 3 14 8 1 1 3 1 2 3 14 3 1 2 3 1 3 3 14 13 12 12 15 1 2 1 1 1 4 1 3 1 2 12 1 4 Length of carapace Length of rostrum. Rostral formula Length of carapace . . Length of rostrum. . . 34 35 36 37 3S 39 40 41 42 43 44 29.5 28,5 27 32,5 21 17 19 18,5 18,5 16 16 34,5 35.5 36,5 30 3L5 28 29.5 27 29 29.5 27 3 1 3 3 14 3 12 3 1 0 3 14 3 1 2 3 1 2 3 1 4 3 1 3 3 1 4 3 14 1 4 1 3 1 2 8 13 1 4 1 4 14 14 1 3 1 1 Rostral formula. 45 46 47 48 49 50 5' 52 14.5 13 34 27 27 20,5 30 28,5 26,5 25.5 32 34.5 34,5 35 37.5 33 3 1 4 1 4 3 1 3 14 3 7 f', 3 9 9 3 1 3 1 4 3 13 1 1 :) 14 1 2 3 1 1 1 1 53 27,5 35 3 1 2 N° 1 — 6 Stat. 38, X" 1 and 2 males, N° 3 — 6 females, N° 3 and 4 with eggs; X" 7 — iS males, the rest young: X" 19 and 20 Stat. 85; N° X° 24 Stat. 178; X° 25 Stat. 21 1; N° 26 Stat. 45, N° 7 — 11 adult females from Stat. 122; 2 1 SIBOGA-EXPEDITIE XXXIXu3. 23 ova-bearing Stat. 267; N° 27 Stat. 297; 23 i7S X" 2S Stat. 300 ; N 29 — 46 Stat. 314, Xu 29 — 36 adult males, N° 37 adult ova-bearing female, the rest young; N° 47 — 53 Stat. 316, N° 47 — 50 adult males, N° 51 — 53 adult females, N° 51 and 52 with eggs. General distribution: Off Banda Island (Bate). Heterocarpoides de Man. Heterocarpoides nov. subg. J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden, Deel III, Afl. 4, December 1917, p. 284. It appears rather beyond a doubt that Dorodotes levicarina Bate, a species found in the Arafura Sea, south of Papua, has originally been referred by Spence Bate to the genus Heterocarpus A. M.-Ed\v. and that, owing to an incomprehensible mistake and error, it has afterwards been described by him as a species of the genus Dorodotes. In the first place the description of this genus on p. 677 of the Report on the Challenger Macrura is only applicable to Dor. reflexies Bate, but not to Dor. levicarina, because both carapace and abdomen are described as smooth, i. e. non carinate, and the ophthalmopod as small and uniarticulate, while in Dor. levicarina carapace and abdomen are carinate and the eyestalk resembles that of the genus Heterocarpus \ in the second place the author remarks at the end of the page "I only know of one species of this genus etc", furthermore we read in his description of Dor. levicarina (p. 681) "the dorsal carina is likewise less conspicuous than in the typical forms of the genus", where the word "forms" can only refer to the numerous species of the genus Heterocarpus and, finally, Dor. levicarina has been figured on the same plate with the other species of that genus. Dorodotes levicarina indeed in all characters agrees with the genus Heterocarpus, excepting only the legs of the second pair, which are equal and only composed of six joints, the ist of which is nearly as long as the following together, the 2nd — 5th, however, very short and equal ; it differs, moreover, from all known species of the genus Heterocarpus by the characteristic carination of the carapace, the post-antennular carina running uninterruptedly from near the posterior margin to the orbital spine, the post-antennal carina wanting entirely, while of the post-ocular carina only the posterior half is developed, that curves downward and unites with the post-antennular on the hepatic region. It agrees therefore both with Hetcroc. ensifer A. M.-Edw. and Heteroc. Wood-masoni Alcock in the possession of the post-antennular carina, but it differs from the former by the suppression of the post-antennal and from the latter by the posterior half of the post-ocular carina being developed; like in Heteroc. ensifer the post-ocular carina curves also downward towards the post-antennular. The subgenus Heterocarpoides is therefore proposed for this species. 9. Heterocarpus (Heterocarpoides) levicarina (Bate). PI. XV, Fig. 44 — 44/- Dorodotes levicarina C. Spence Bate, Report Challenger Macrura, 188S, p. 680, PI. CXII, fig. 5. Dorodotes levicarina J. R. Henderson, A contribution to Indian Carcinology, 1893, p. 436. Dorodotes levicarina H. Balss, Die Decapoden des Roten Meeres. I. Macruren. Wien 191 5, p. 20. Stat. 47. April 8 12. Bay of Bima, near south fort. 13 — 31 m. Bottom mud with patches of fine coral sand. 1 young specimen. 179 Stat. 164. Aug. 20. i°42'.5 S., I30°47'.5 E. Between the islands ofMisool and Salawatti. 32 ra Bottom sand, small stones and shells. 1 young specimen. Stat. 306. Febr. 8, 1900. 8° 27' S., i22°54'.sE. Lobetobi Strait. 247 m. Bottom sandy mud. 1 specimen of medium size without eggs and 1 still younger specimen. Stat. 312. Febr. 14, 1900. 8° 19' S., U7°4i'E. Saleh-bay. 274 m. Bottom fine, sandy mud. 6 ad uit specimens, 3 of which are ova-bearing. Spence Bate describes the rostrum as half as long as the carapace, but, according to the measurements mentioned by him and according to the figure, the rostrum measures three- fourths the length of the carapace. In the young specimen from Stat. 164 the carapace is 6,7 mm. long, the rostrum, measured from the orbital margin to the apex, 5,25 mm., the proportion between both being the same as in the. typical species-, the rostrum, that just reaches beyond the antennal scale and that, though slightly ascending, does not extend above the level of the carapace, is armed dorsally with 10, ventrally with 4 teeth. In Bate's figure the teeth, in which the 4th and 5th abdominal terga terminate, appear very small, much smaller than the tooth of the 3rd tergum: as regards this character the specimen from Stat. 164 fully resembles the type. In all the other specimens, however, that were collected in the more western parts of the Archipelago, the teeth of the 4th and 5th terga are a little larger in proportion to the tooth of the 3rd tergum and in all these specimens the rostrum is a little longer than the carapace and has a more si en der form. In the young specimen from Stat. 47 the rostrum is broken off just beyond the antennal scale, so that its length cannot be indicated; the carapace is 7,1 mm. long. In this specimen the carinae on the carapace are more conspicuous than in the others; the post-antennular carina runs quite distinctly from near the posterior margin uninterruptedly to the orbital spine, while the posterior half of the post-ocular becomes rather indistinct distally, there where it curves towards the other. In the larger specimen from Stat. 306 the carapace is 8,5 mm. long, the rostrum 9 mm.; the rostrum which reaches by two-fifths of its length beyond the antennal scale and which is rather much upturned above the level of the carapace, is ^-dentate; the carapace of the young individual is only 4,4 mm. long, the rostrum is broken off near the tip of the antennal scale. The 6 specimens from Stat. 312 are almost full-grown, the length of the carapace varies between 10 mm. and 10,7 mm., the length of the rostrum between 10,25 mm. and 12,2 mm.; in the specimen without eggs, of which the carapace is 10,25 mm. long, the rostrum 12,2 mm., the latter is -^-dentate, reaches by two-fifths its length beyond the antennal scale and is distinctly turned upward above the level of the carapace; in the four other females the rostrum is y, ±^, i* and ^-dentate, while in the last specimen it is broken off. We may therefore conclude, that the number of dorsal teeth varies from 9 to 14, for in one of the two individuals, from the Red Sea, mentioned by Dr. Balss (1. c), the upper margin was only armed with 9 teeth ; the lower margin bears 4 to 6 teeth, in the specimen from the Red Sea only 2 were observed. Usually four teeth stand on the carapace, the 5,h above the orbital margin; in one of the specimens from Stat. 312, the rostrum of which is y-dentate, five teeth were placed on the carapace and in the larger specimen from Stat. 306 only three stood behind the orbital margin, the 4th being placed just above it. In all these specimens from Stat. 312 the lateral carinae i8o of the carapace are little distinct, especially the post-antennular, though in a dry condition they are appreciable, as Spence Bate has already remarked. As regards the appendages I may add the following. The scaphognathite (Fig. 44 a) is broadly rounded posteriorlv. In the ova-bearing female the external maxillipeds reach to the obtuse tip of the antennal scale, their exopodite is well-developed and extends to beyond the middle of the antepenultimate joint. The legs of the ist pair (Fig. 44^) are much shorter, reaching only to the far end of the antennal peduncle, while those of the 2nd (Fig. 44 c, 44^, 44£-) are as long as the external maxillipeds; the peraeopods of the 3rd pair extend by the dactyli beyond the antennal scale, the following gradually diminish in length, so that the 5th pair do not yet reach to the tip of the scale. The propodi (3,9 mm.) of the 3rd legs (Fig. 44/) are nearly tvvice as long as the carpus (2 mm.) and the dactyli (1,85 mm.) are almost half as long as the propodi, that are very slender and slightly curved. Following legs like the third. Epipodites on all the peraeopods well-developed, except on the last pair. The form from the western Indian Archipelago should perhaps be distinguished as -a variety longirostris from the typical species, that occurs in the Arafura Sea and in the seas south of New Guinea : I do not venture to decide this question, because only one young specimen of the typical species has been collected. General distribution: Arafura Sea, near Torres Strait (Spence Bate); Gulf of Martaban (Henderson); Red Sea (Balss). Chlorotocella Balss. 1. Chlorotocella gracilis Balss. PI. XV, Fig. 45, 45 a. Chlorotocella gracilis H. Balss, Üstasiatische Decapoden II. Die Natantia und Reptantia. Miinchen 1914, p. 33, fig. 16 — 22. Stat. 7. March 11. 70 55'. 5 S., U4°26'E. Reef of Batjulmati (Java). 2 specimens. Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. Between the islands of Misool and Salawatti. 32 m. Bottom sand, small stones and shells. 2 specimens. The two specimens from Stat. 164 are not yet adult and bear no eggs. The carapace of the larger is 3,7 mm. long, the rostrum 6,2 mm., 5th abdominal somite 1,25 mm., 6th 2,8 mm., telson 2,8 mm.; in the other the rostrum is broken off at the far end of the basal antennular article, the carapace is 3,55 mm. long, the 5th abdominal somite 1,2 mm., 6th 2,84 mm., telson 2,6 mm. The rostrum of the larger specimen is therefore a little more than one and a half as long as the carapace and agrees with the figure 16 of the quoted paper. We read in it about the carapace: "von Stacheln sind nur der Antennal- und der Branchiostegaldorn vorhanden", the carapace, however, is also armed with a well-developed supraorbital spine; the three spines are nearly of the same size. In Fig. 1 7 of the original paper the supraorbital spine is figured, but it has been omitted in Fig. 16. The outer orbital angle appears as a prominent truncate process, that is somewhat narrowed at its base. With regard to the abdomen I would remark, that the terga both of the 4"1 and of the 5th somite (Fig. 45 a) are armed on their posterior margin at each side with a spine and that there is also a spine on the posterior margin of the pleura of the 5"1 somite; the two first mentioned spines are of the same size, the last iSi mentioned is a little smaller. Balss does not describe them and in his figure 16 only the spine on the posterior margin of the 5th somite has been drawn. In the larger specimen the telson is a little shorter than the 6th somite, in the other both have the sa me length; it is armed with 8 pairs of small marginal spines, that slightly increase in length posteriörly and the foremost of which is placed at the anterior third and at the level of the antenor spine one observes moreover a submedian pair of spines. In the younger specimen the telson is nearly as long as the exopodite of the tailfan, in the other it is a little shorter. The 3rd article of the antennular peduncle is armed above with a spine. The antennal scale measures two-thirds the length of the carapace and is 2,4 mm. long, in both specimens. The legs of the 3rd and 4th pair are of the same length and show the same measurements, in both legs the carpus (in the younger specimen) is 1,1 6 mm. long, the propodus 1,6 mm., almost one and a half as long as the carpus, the slightly curved and unarmed dactylus 0,44 mm., little more than one-fourth the length of the propodus; the carpus of the 5th leg is 1,3 mm. long, the propodus 1,66 mm., the dactylus 0,44 mm., so that in these legs the propodus is hardly one-third longer than the carpus. The two specimens from Stat. 7 are a trifle larger than the preceding, their carapace being just 4 mm. long. In these specimens, which for the rest agree with those from Stat. 164, one observes on the posterior half of the 3rd tergum, at either side of the mid-dorsal line and close to it, a short longitudinal groove or impression ; the two grooves do not extend to the posterior margin, but, converging backward, unite together, so that that part of the upper surface which is limited by them, looks like a shield, with sharp lateral margins and acute posterior extremity. In the specimens from Stat. 164 the two grooves are still hardly discernible. General distribution: Sagami Bay, Dzushi, Enoshima (Japan) (Balss). ChlorotOCUS A. M.-Edw. The genus Chlorotocus, established by A. Milne-Edwards in the "Rapport sur les travaux de la Commission pour la faune sous-marine. Paris, 1882, p. 18", on a species obtained July 27, 1 88 1 , by the "Travailleur" in the Gulf of Gascony and named by him gracilipes, but which species, as was pointed out by Senna in 1904, is identical with Pandalus crassicornis from the Gulf of Naples, described by A. Costa in 1871, contains at present four species and one variety. Chlorotocus crassicornis (A. Costa) occurs throughout the whole Mediterranean (Cyclades, Sporades, Ligurian Coast, Gulf of Naples), the Adriatic and the Gulf of Gascony ; it has, however, also been observed off the coast of the Cape colony and of Natal, while a variety andamanensis Anderson was taken by the "Investigator" in the Andaman Sea. Chlorot. incertus Bate is known from the Agulhas Bank, off the Cape of Good Hope; a specimen from the Sagami Bay, Japan, was referred by Dr. Balss with some doubt to the same form. The third species is the remarkable Chlorot. spinicauda de Man, which represents the genus in the Indian Archipelago, while the last is Chlorot. Xovae-Zeahuidiae (Borr.), which has been discovered a few years ago by the british "Terra Nova" Expedition off the North Cape, New Zealand, and which was at first wrongly referred to the genus Thalassocaris Stimps. 182 Chlorot. spinicauda is found in rather shallow water between 30 and 51 fathoms and seems to be a rare species; Chlorot. incertus was taken at a depth of 150 fathoms, Chlorot. crassicomis, the type species, from 80 to 326 fathoms, the variety andamanensis at 185, Chlorot. Novae-Zealandiae (Borr.), finally, at a depth of 70 fathoms. 1. Chlorotocus spinicauda de Man. PI. XV and XVI, Fig. 46 — 46^. Chlorotocus spinicauda J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesellschaft, Bd. 25, 1902, p. 856, Taf. XXVI, Fig. 59 — 59/r. Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 54 — 90 m. Bottom fine grey sand ; coarse sand with shells and stones. 1 full- grown, egg-laden female. Stat. 153. August 14. o°3'.8N., I30°24'.3E. N.W.-coast of Waigeu-island. 141 m. Bottom fine and coarse sand with dead shells. 1 young male. Stat. 204. Sept. 20. 4°2o'S., I22°5S'E. Between islands of Wowoni and Buton. From 75 — 94 m. Bottom sand with dead shells. 1 male. The specimens from the Stations 5 1 and 204 perfectly agree with the detailed description ') of the specimen from Ternate, described in 1902, except in some particulars ovving to their full development; the specimen from Ternate was very young, as I already suggested in 1902, but the male from Stat. 204 is 25 mm. long and the egg-laden female from Stat. 51 measures nearly 36 mm. from apex of rostrum to tip of telson. Carapace and rostrum, taken together, are in these adult specimens a little shorter than the abdomen : in the male the carapace measures 6 mm., the rostrum 4,9 mm., the abdomen 14 mm., in the female these numbers are, in the same succession, 8 mm., 6,75 mm. and 20,85 mm- While the carapace of the male resembles the figure 59 of the originai description, as regards the proportion between length and height, the carapace being in the male from Stat. 204 6 mm. long and 4,9 mm. high, in the large full-grown female the carapace appears comparatively much higher, namely 8 mm. long and 7,5 mm. high. Owïng to the greater height of the carapace the upper border of the rostrum appears in the full-grown female more strongly turned downward than in the young specimen from Ternate and the male from Stat. 204, but the lower margin runs like in these specimens-, both in the male and in the female the rostrum is 1-dentate and in both the 3rd tooth stands above the orbital margin; also, as regards the general form, the rostrum resembles the figures 59 and 59a. The small tubercle on the middle of the upper border of the carapace is in the female quite distinct and there is another similar, small tubercle at the base of the ist tooth; in the male both tubercles are less developed. Behind the tubercle the cardiac region appears a little uneven, more distinctly in the larger female than in the male. In both specimens the orbital spine reaches to the cornea of the eyes and is much longer than the branchiostegal spine, which is not carinate: according to the originai description in the young specimen from Ternate this spine should have been carinate. Antero-inferior angle of carapace rounded, lower margin carinate. 1) This description contains two clerical errors: p. 857, line 14 from above, for "zweiten", read "sechsten"; p. 858, line 10 from above, for "vierte" read "fünfte". The abdomen of the male accords with the original description, but the median spine on the posterior margin of the 6lh somite is only half as long as the lateral and this is also the case in the female. The abdomen of the female differs, moreover, from that of the male by the strong development of the pleura of the ist and 2nd somite and by the reduction of their spines, that are very small, much smaller than in the male. While in the male the anterior margin of the pleura of the ist somite is straight or, like in the young specimen from Ternate, even slightly concave and does not reach over the carapace, in the female the pleura of the ist somite are strongly curved anteriorly, covering the adjacent part of the carapace; the 3rd and following somites agree with those of the male. The ocellus on the eyestalk of Chlorot. incertus is described as independent, in Chlorot. spinicauda it is not circular but o val and transverse and its anterior margin lies against the cornea ; the cornea is distinctly broader and nearly as long, though not shorter than the rest of the ophthalmopod ; in the type species, Chlorot. crassicornis, an ocellus is wanting. The antennular flagella are subequal and a little longer than the carapace ; the thickened part of the outer flagellum reaches almost to the tip of the antennal scale. The antennal flagellum of the male, though not quite complete, is 20 mm. long and will, no doubt, once prove to be as long as the body. The molar process of the mandible (Fig. 46 «) of the male is truncate at the tip, the margins are not toothed, but somewhat lobate ; the incisor process terminates in 5 acute teeth, of which the two lateral are twice as large as the three others that are equal. The palp is (Fig. 46^) three-jointed, like in Chlorot. crassicornis (Th. R. R. Stebbing, South African Crustacea, Part VII, 1914, p. 42, PI. XI, fig. m)\ the ist or basal joint is 0,5 mm. long, the 2nd 0,22 mm., half as long as the ist, the 3rd or terminal 0,63 mm., nearly 3-times as long as the 2nd. The joints are flattened, the 3rd about 21/3-times as long as wide at base, narrowing regularly to the obtuse tip and the margins are fringed with setae. Stebbing (1. c.) remarks, that the incisor process of the mandible of Chlorot. incertus was figured by Spence Bate (Challenger Macrura, PI. CXVI, Fig. 1 d) as a sort of stiletto : concerning this I would say, that in a certain position of the mandible this process shows the same form in Chlorot. spini- cauda, when namely the incisor is looked at from the lateral edge. The emarginate tip of the palp of the ist maxilla (Fig. 46 f) bears at one angle two setae of unequal length, at the other angle one; the middle branch shows a characteristic notch o r i n cis i o n , but seems to have been damaged by the operation ; the third branch is curved and fringed with stiff setae, partly feathered and spiniform. Unfortunately, also in consequence of the operation, the posterior half of the scapho- gnathite has been cut off; of the two inner distal lobes that project far beyond the basal lobe, the anterior is one and a half as long as the posterior and rounded anteriorly. The second maxillipeds (Fig. 46^, 46c) differ from those of Chlorot. crassicornis and incertus by the shape of the /th or terminal joint. While in these two species it is applied as a strip along a great part of the outer margin of the 6th, in Chlorot. spinicauda the /th joint is attached near the posterior extremity of that margin, its length being hardly one-fourth 184 the length of the 6!h and the terminal joint is but little broader than long; the outer margin both of the 6th and the 7lh joint is fringed with spiniform setae. The external maxillipeds reach in the adult female to the distal fourth of the antennal scale ; the well-developed exopodite reaches in the male almost to the middle of the penultimate joint ; the terminal joint is a little more than 3-times as long as the penultimate, the proportion being like 10:3, just as in the yourig specimen from Ternate. All the described mouth-parts are taken from the left side of the male. Excepting the 5th pair all the legs bear well-developed epipodites. The legs of the ist pair are as long as in the young specimen from Ternate, but the 2nd pair extend to the apex of the antennal scale; in the female the 2nd joint of the carpus is 2y2-times as long as the 1 st, the chela one-fourth shorter than the carpus and the palm one and a half as long as the fingers. The dactylus ends in two curved claws, that embrace the single claw of the immobile fineer, when the fingers are shut; at the base of the claw of the immobile fineer one observes, at the inner side, a very small tooth or spine. The three posterior legs diminish considerably in length from the 3rd to the 5,h and they are comparatively just as long as in the young specimen from Ternate, the 3rd pair reaching to the end of the external maxillipeds, the 5th to the anterior margin of the carapace. They agree with the original description, but, owing to these specimens being full-grown, they bear a somewhat larger number of spines and setae. The merus of the 3ld pair is armed, in the female, on the middle third of its posterior margin with 4 stout spines, that increase in length from the posterior to the anterior and the posterior is a little farther distant from the 2nd as the 2nd from the 3ld and as the 3rd from the 4th; a 5th spine, as long as the 4th, occurs just behincl the distal extremity. A spine, as long as the 5th of the merus, occurs, besides 3 or 4 smaller ones, at the far end of the lower margin of the carpus and a smaller spine stands on the middle of the posterior margin. The posterior margin of the propodus is armed with 13 spines of somewhat unequal length, that are of a more slender form than those of the merus and at the base of each 2 or 3 setae are implanted, a few spines and setae are implanted on the lateral surface near the posterior margin and 7 or 8 similar spines occur on the anterior margin, also accompanied by a few setae; the dactylus, finally, has 5 spines on its posterior margin. The legs of the 4"1 pair agree with those of the 3ld, as regards the number of spines and setae. The merus of the 5th pair carries 2 spines in the middle, a third near the proximal and a fourth near the distal extremity, carpus as in the preceding legs; there are 14 slender spines on the posterior margin of the propodus and 3 or 4 on that of the dactylus. In the 2nd pleopods of the male both the stylamblys and the appendix masculina are well-developed. Eggs not very numerous, rather large, oval, 0,8 — 0,9 mm. long. The male from Stat. 153 is hardly longer than the male from Ternate, carapace and rostrum being together 7,6 mm. long; it fully resembles it, but the median spine on the posterior marein of the 6th somite measures two-thirds the leneth of the lateral. The small tubercles at the base of the ist tooth of the rostrum and on the middle of the carapace are well-developed. General distribution: Ternate (de Man). Superfamily PSALIDOPODOIDA. Family Psalidopodidae. Psalidopus W.-Mas. This genus, the only one of the remarkable family of Psalidopodidae, is only represented by two species, which were discovered during the Season 1890 — 91 by H. M. Indian Marine Survey Steamer " Investigator" in the Andaman and Arabian Seas. Psalidopus Huxlcyi W.-Mas. was until at present only known by a single adult female, taken at a depth of 490 fathoms in the Andaman Sea, 71/., miles east of N. Cinque Island. Of the other form, Psalidopus spini- ventris W.-Mas., both the male and the female are known: five specimens have been obtained in the Andaman Sea at 405 and 500 fathoms, in the Arabian Sea, in the neighbourhood of the Laccadives, at 636 and off Cape Comorin at 480 fathoms. The Psalidopodidae are apparently very rare animals, a suggestion conhrmed by the fact that the "Siboga" has only obtained one single individual. 1. Psalidopus Huxlcyi W.-Mas. PI. XVI, Fig. 47, 4.7a. Psalidopus Huxlcyi J. YVood-Mason, Ann. Mag. Nat. Hist, April 1892, p. 273, PI. XIV. figs. 1, 2, 7. Psalidopus Huxleyi A. Alcock, A descript. Catal. Indian Deep-Sea Crustacea, Calcutta 1901, p. 112. Illustrations of the Zoology of the Investigator, Crustacea, PI. LI, figs. 5, $a — b. Stat. 300. January 30, 1900. lO°48'.6S., I23°23'.i E. Off the south coast of Rotti. 918 m. Bottom fine grey mud. 1 adult female without eggs. As far as I am aware, this is the second specimen of this species, which has been discovered; it is therefore a capture of great importance, though the discovery of the male should have been still more interesting. Our specimen very well agrees with the quoted descriptions and figures and shows about the same size. The carapace, indeed, from supra-orbital to posterior margin proves to be 28,5 mm. long, the rostrum 52 mm., but the abdomen is 72 or 73 mm. long from the middle of the anterior margin of first tergum to tip of telson, instead of 63 mm. in Wüod-Masox's specimen. In the first description of 1892 both species are distinguished, besides by the thoracic and abdominal sterna being unarmed or not, by the existence in Psalid. S1BOGA-EXPEDITIE XXXIX,;3. 24 i86 spiniventris of a conical tubercle between the last spine of the dorsal ridge and the posterior margin of the carapace: in the present female a small subacute tubercle occurs just in front of the posterior margin, while it is one millimeter distant from the last spine. In Alcock's description of 1901 this character has rightly no more been mentioned. The three posterior legs appear a little shorter than in that description. The 5"1 pair, indeed, nearly reach the tip of the antennal scale, but do not extend beyond it; the 4th pair reach only to the base of the terminal spine of the scale and the legs of the 3vd pair are hardly shorter. The depth, 918 meter = 500 fathoms, at which this female was taken, is the same as that of the type specimen. The colour of this specimen, preserved in alcohol, is yellow-whitish. General distribution: Andaman Sea, 71/.-, miles east of N. Cinque Island. Superfamily CRANGONOIDA. Family Gnathophyllidae. LIST OF ALL THE SPECIES OF GNATHOPHYLLIDAE, KNOWN AT PRESENT. SPECIES HABITAT DEPTII IX FATHOMS americanum Guér. 1857. clegans (Risso) 18 16. Gnathophyllum Latr. 1S29. Cuba St. Thomas Porto Rico Gulf of Mexico Bermudas Mediterranean Adriatic elcgans (Risso) var. brevirostris Gourret 1887 fasciolatum Stimps. 1860 , panamense Faxon 1893 tridens Nobili 1906 Rikitea sp. Hay 19 17 'J North Carolina Gulf of Marseille Port Jackson Port Stephens Hawaiian Islands Tahiti Amboina Ternate Near the North-point of Saleyer-island East coast of Borneo Mauritius Minikoi Seychelles Djibouti, Muschah Islands Panama 26 to 27 10 — 20 6 Surface Reef Reef Muaras-reef On the reef, at low tide Reef 1) This species has been desciibed in: Proc. Biol. Soc. Washington. Vol. 30. 1917, p. 71 — 74, this periodical, however, was not at my disposal. i SS SPECIES HABITAT DEPTH IN FATHOMS Phyllognathia Borr. 191 5. ceratophthalma (Balss) 1913 \ Satsuma, Japan S. Nilandu Atoll, in the Maldives elegans Heller 1861 Latreillii Guér. . picta Dana 1852 Hymenocera Latr. 1829. Tor, Red Sea Djibouti Matemmo Island, Mozambique Seychelles Mauritius West coast of Binongka Amboina Ternate Seychelles Raraka, Paumotu Islands. Betvveen Corals Reef, at 2 fathoms Reef Coral reefs Gnathophyllum Latr. The genus Gnathophyllum Latr. contains five or six species and one variety, all of small size and of a charming and elegant colouration. Gnathophyllum elegans (Risso) is found in the Mediterranean and the Adriatic, a variety brevirostris Gourret v) occurs in the Bay of Marseilles. A species from the coast of North Carolina has recently been described by W. P. Hay (vide p. 187, Xote). Still a second form occurs on the East coast of America, namely in the Gulf of Mexico, at the Bermudas and on the shores of Cuba and Porto Rico, Gnath. ameri- camim Guér., with which an indopacific species, Gnath. fasciolatum Stimps., is considered by Miss Rathbun and Nobii.i to be identical. This Gnath. fasciolatum Stimps. is known from Port Jackson, from the Hawaiian Islands and from the Indian Archipelago, having been observed at Ternate, Amboina, near the North point of Saleyer-island and on the Muaras-reef, east coast of Borneo ; it is known from the Seychelles, Minikoi and Djibouti and is moreover recorded by Ortmann from Tahiti under the name of Gnath. pallidum and by Richters from Mauritius under the name of Gnath. zebra. Gnath. triolens Nobili, which in the pattern of its colouration much resembles Gnath. fasciolatum, is still only known from the reefs of Rikitea, on the isle of Mangareva, one of the Paumotu Islands. The last species, finally, Gnath. panamense Faxon, was taken on the reef at Panama. Gnath. elegans (Risso) occurs at a depth of 10 — 20 fathoms, while Gnath. americanum Guér. is found in the Gulf of Mexico at 26 to 27 fathoms; Gnath. fasciolatum Stimps. was taken in water of 6 fathoms in Port Jackson and off the Hawaiian Islands at the surface, Gnath. tridcns and panamense, finally, on the reef at low tide. 1) In P. Gourret's wovk "Révision des Crustacés Podophtfialmes du Golfe de Marseille, Marseille iSSS" this variety is described at p. 120 under the name of brevirostris, but at p. 33 under the name of rectirostris ! Gourret's "Note a 1'Institut 18S7" was not at my disposal. 189 i. Gnatkophyllum fasciolatum Stimps. PI. XVI, Fig\ 48 — 48^. Gnatkophyllum fasciolatum W. Stimpson, Proc. Acad. Nat. Scienc. Philadelphia, 1860, p. 28. Gnatkophyllum fasciolatum J. G. de Man, Archiv f. Naturg. Bd. 53, 1888, p. 496 and in: Abhandl. Senckenb. Naturf. Gcsells. Bd. XXV, 1902, p. 762. Gnatkophyllum fasciolatum M. J. Rathbun, in: U.S. Fish Commission Buil. for 1903, Part III, Wash. 1906, p. 926, fig. 74. Stat. 91. June 22. Muaras-reef, inner side: east coast of Borneo. 1 ova-bearing female. Stat. 1S1. Sept. 5/ir. Ambon-anchorage. Reef. 2 adult males and 2 adult, ova-bearing females. Stat. 213. Sept. 26 — Üct. 26. Pulu Pasi Tanette, near the North point of Saleyer-island. Reef. 1 female without eggs. According to Stimpson this species attains a length of about 20 mm., the largest of the present specimens, an ova-bearing female from Amboina, measures nearly 15 mm. from tij) of rostrum to tip of telson. Like in many other Caridea the development of ova takes place at different ages, the egg-bearing female from Stat. 91, indeed, is only 8,5 mm. long! In all the specimens the rostrum, a trifle shorter than the basal joint of the antennular peduncle, is armed above with f i v e teeth, not including the acute tip, and below with o n e minute, almost rudimentary denticle, which is considerably smaller than the teeth on the upper margin; in the largest female from Stat. 181 this denticle is as far distant from the apex as the anterior tooth of the upper margin, in one male just half as far distant from the apex as this tooth, while in the rest the anterior tooth is one and a half as far distant from the apex as the small denticle. As was already pomted out by Richters in his description of the identical Gnath. zcl>ra (in: Beitrage zur Meeresfauna der Insel Mauritius und der Seychellen, 1880, p. 162, Taf. XVII, hg. 22), the ist or posterior tooth of the upper border is placed just in front of the orbital margin, a character also observed in Gnath. tridens Xobili from the reefs of Rikitea, hut not in Gnath. elegans (Risso) nor in Gnath. panamense Faxon. The rostrum arises gradually with a rounded and obtuse carina in front of the middle of the carapace, and this carina becomes gradually more compressed anteriorly; viewed at from above the rostrum looks like an equilateral triangle, fiattened at either side of the median carina, the lateral margins of which are rather sharp. Antennal spine well-developed. Antero-inferior angle of carapace prominent, projecting a little beyond the 2nd joint of the antennal peduncle. Sixth somite of abdomen little longer than 5th. The telson (Fig. 48, 48 a) measures in the adult female two-fifths the length of the carapace, rostrum included. In full-grown specimens il is twice as long as wide proximally, but in the ova-bearing female from Stat. 91, which is only 8,5 mm. long, it appears a little less than half as broad at base as long; width of tip almost half as large as that of the base. The lateral spinules of the telson are rather large, in adult individuals measuring 0,24 — 0,28 mm.; the anterior pair is usually placed on the middle of the telson, the posterior at the posterior fourth, but in the male (N° 2 of the Table) the anterior pair is implanted a little more backward, so that the distance between the two pairs is here smaller; of the two pairs of terminal spines the longer measure s/-8 the length of the telson, the shorter 3/. of the longer. Eyepeduncles robust, a little longer than the rostrum, with a black coloured tubercle 190 on the middle of the cornea and with a small, black ocellus on the upper side of the stalk, contiguous to the cornea. Basal joint of antennular peduncle considerably dilated laterally, the dilated part truncate anteriorly with a forwardly directed spine at the outer angle, stylocerite flattened with the acute tip curved inward and just reaching beyond the boundary between the tst and 2nd article; 2nd article slightly broader than long, 3rd a little smaller than 2Dd. Second joint of antennal peduncle unarmed, the peduncle as long as the basal joint of the peduncle of the upper antennae; scale a little longer than the latter, with the outer margin straight and the terminal spine a little shorter than the rounded tip of the lamella. Antero-external angle of the antepenultimate joint (Fig. 48^) of the external maxillipeds rounded-, penultimate joint trapeziform, the inner and outer margins parallel, the inner shorter than the outer; ultimate joint elliptical, twice as long as broad and distinctly longer than the penultimate. Peraeopods of the ist pair equal, reaching by the chela beyond the antennal scale, carpus nearly as long as the merus, chela a little shorter than the carpus, fingers a little shorter than the palm. Peraeopods of the 2nd pair (Fig. 48c, 48^) also equal, in the male larger and stronger than in the female, and projecting by the chela beyond the antennal scale. Merus of 2"d pair, in the male, nearly half as long as the carapace, rostrum included, 4-times as long as broad ; carpus a trifle shorter than merus, 3-times as long as thick distally; chela 21/.1-times as long as the carpus and a little longer than the carapace, rostrum included, palm three-fourths the length of the chela, 4-times as long as broad and slightly becoming broader from the carpal articulation to that of the dactylus; immobile finger with 2 teeth on the proximal half of the cutting-edge, while the tvvo teeth of the dactylus are placed close together on the middle of the finger, the teeth of the immobile finger are a little larger than those of the dactylus and on each finger the proximal tooth is distinctly larger than the following. In the adult female the merus of the 2nd legs measures about two-fifths the length of the carapace, rostrum included, and is, like in the male, 4-times as long as wide; carpus a trifle shorter than the merus and nearly 3-times as long as thick distally; chela a little shorter than the carapace, rostrum included, 21/.,-times as long as the carpus, palm 4-times as long as broad and measuring two- thirds the length of the chela, fingers half as long as the palm, each with two teeth, placed like in the male,-but much smaller, rudimentary. Dactyli of the three posterior legs (Fig. 4.8e) with a small, acute, accessory claw. Largest diameter of the ova, both in the full-grown (Stat. 1S1) and in the small-sized (Stat. 91) female, long 0,52 mm. The two males bear a parasite on the under side of the abdomen. Length of carapace, rostrum included, of the male 4,5 mm., of the full-grown female 4,85 mm. T a b 1 e of Measurements in millimeters. Length of telson . . Width of telson at base Width of tip of telson cf tf 9 1 2 3 '.7 i.7 1,92 0,85 0,85 o,95 0,38 0,4 0,42 9 4 1,2 o,54 0,24 I9I Distance between the base and the anterior pair of lateral spinules Distance between the base and the posterior pair of lateral spinules Length of the merus Width of the merus Length of the carpus Width of the carpus at distal extremity Length of the chela Length of the palm Width of the palm in the middle Len«th of the fingers of the leg of the 2nd pair c? c? 9 i 2 3 0,84 0,96 0,95 1,2 ',32 i>4 2,12 2 o,54 o,5 2 1,8 1 o,7 0,64 5,i 4.44 3.7 3 o,95 o,77 i,4 1.44 9 4 0,62 0,92 N° 1 — 3 Stat. 181, N° 4 female from Stat. 91. General distribution: Port Jackson (Stimpson); Hawaiian Islands (Rathbun); Tahiti (Ortmann, as Gnath. pallidum); Amboina (de Man); Ternate (de Man); Mauritius (Richters, as Gnath. zebra); Minikoi (Borradaile); Seychelles (Borradaile); Djibouti, Muschah Islands (Nobili, as Gnath. americanum Guér.). According to Miss Rathbun Gnath. fasciolatum Stimps. should be identical with Gnath. americanum Guér. and in this case occur in the Gulf of Mexico, on the shores of Cuba and Porto Rico. Hymenocera Latr. In the "Proceedings of the Academy of Natural Sciences of Philadelphia" the late Professor B. Sharp has published in 1893 a Catalogue of the Crustacea in the Museum of that Academy. This Catalogue mentions the name of Hymenocera Latreillii Guér., Indian Region, Seychelles, but I dicl not succeed in establishing in which work and at what time this species was described by Guérin. Besides this Hym. Latreillii still two other species of the genus are known as occurring in the Indopacific, firstly Hym. picta Dana from the coral reefs of Raraka, one of the Paumotu Islands, and furthermore Hym. elegans Heller, which is found in the Red Sea, in Coetivy, Seychelles, on the coast of Mozambique, off Mauritius and in the Indian Archipelago, a form which perhaps shall prove to be identical with the species described by Guérin. The species of Hymenocera are found between corals on coral reefs. 1. Hymenocera elegans Heller. PI. XVI, Fig. 49. Hymenocera elegans C. Heller, in: Sitz. Ber. Kais. Akad. Wiss. Wien, XLIV 1861, p. 264, Taf. III, fig. 9 — 14. Hymenocera elegans F. Hilgendorf, in: Monatsber. Kon. Akad. Wiss. Berlin, Nov. 1S7S, p. 828. Hymenocera elegans J. G. de Man, in: Abhandl. Senckenb. Naturf. Gesells. Frankfurt a Main, XXV, 1902, p. 822, Taf. XXV, fig. 52. Hymenocera elegans G. Nobili, in: Annal. Scienc. Natur. 9e Série, Zool. T. IV, 1906, p. 69. Stat. 220. Nov 1/3. Anchorage off Fasir Pandjang; west coast of Binongka. Reef. 1 female without eggs. l92 This female is 26 mm. long trom tip of rostrum to tip of telson and proves thus to be half-grown, lor of this species the male and the female attain respectively a length of 40 mm. and 44 mm. (J. G. DE Man, G. Nobili, locis citatis); it fully agrees with the younger specimens from Ternate, described by me in 1902. The rostrum that reaches to beyond the middle of 2ml antennular article, is f-dentate, two teeth stand on the carapace, the third above the orbital margin with the tip situated a little in front of it; tooth of the lower border placed just below the anterior tooth of the upper. The telson (Fig. 49), 3 mm. long, measures about */„ the entire length, the width, anteriorly, 1,8 mm., is a little more than half the length and in proportion to the width, 0,64 mm., of the tip like 1 10,36; the dorso-lateral spinules are rather large, the anterior 0,6 mm. long, one-fifth the length of the telson, the posterior 0,5 mm. long; the telson terminates in a sharp spine, on either side of which two spines are implanted, of which the lon^er inner one measures one-third the entire lenoth of the telson, the outer one two-fifths the inner. Uropods considerably longer than telson. According to Nobili the pleopods of the adult, ova-bearing female are "élargies, foliacées, membraneuses, amples, analogues (mais de forme ovalaire et moins larges) aux expansions membraneuses des antennules et des maxillipèdes". In the present female they have the usual lanceolate shape ; the exopodite of the 2nd pleopod is 3 mm. long, 5-times as long as broad, appearing rather narrovv, the inner branch, which is hardly shorter, 6-times as long as broad ; stylamblys with well-developed cincinnuli at the tip, 0,8 mm. long, two-sevenths the length of the inner branch, and implanted, as usual, at the proximal third of the outer margin. This species will perhaps prove to be identical with Hymenocera Latreillü Guér. of the Seychelles, mentioned at p. 191. General distribution: Tor, Red Sea (Heller); Djibouti (Nobili); Matemmo Island, Mozambique (Hilgendorf) ; Seychelles (Borradaile) ; Mauritius (Ortmann); Amboina (Ortmann); Ternate (de Man). Family Processidae. Nikoides Paulson. The genus Nikoides Paulson, distinguished from Processa Leach by the ist pair of perae- opods being furnished with a well-developed exopodite, comprises four species. One of them, Nik. pontica Sowinsky, is found in the Black Sea. Nik. Danae Paulson, the first described species, occurs in the Red Sea and is known from Djibouti, Perim and the Kamaran Islands. A third closely related form, Nik. maldivensis Borr., has been recorded from the Maldives and the Amirante Islands. The fourth species, finally, Nik. Sibogae, was captured by the "Siboga" off Makassar, at the east coast of the Aru-islands and between Nusa Besi and the N.E.-point of Timor. The species of ATikoides occur in shallow water. Nik. Danac was found at Djibouti at a depth of 11 fathoms, Nik. Sibogae at 50, at 31, between 15 and 30 and up to 17 fathoms. 193 LIST OF THE SPECIES OF NIKOIDES Paulson, KNOWN AT PRESENT. SPECIES HABITAT DEPTH IN FATHOMS Danae Paulson 1875 . . Red Sea Djibouti I I Perim Kamaran Islands tnaldivensis Borr. 191 5. Maldive Islands Amirante Islands pontica Sowinsky 1882. Black Sea Sibogae de Man 1918 . Makassar Up to 17 2,3 miles N. 630 W. from the North-point of Nu hu Jaan, Kei-islands 50 East coast of Aru-islands 3i Between Nusa Besi and the N.E.-point of Timor I5 — 30 1. Nikoides Sibogae de Man. PI. XVI, Fig. 50 — 50/. Nikoides Sibogae J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. 1918, Deel IV, Afl. 3, p. 160. Stat. 71. May 10 — June 7. Makassar and Surroundings. Up to 32 m. Bottom mud. Sand with mud. 1 young specimen. Stat. 260. Dec. 16 and 18. 5°36'.5 S., I32°55'.2E. 90 m. 2,3 miles N. 63°W. from the North point of Nuhu Jaan, Kei-islands. Bottom sand, coral and shells. 1 full-grown, ova-bearing female, wrapped in a felt-like tube. Stat. 274. Dec. 26. 5°28'.2S., I34°53'.9E. East coast of Aru-islands. 57 m. 2 females without eggs. Stat. 282. January 15/17, 1900. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and the N.E.-point of Limor. 27 — 54 m. Bottom sand, coral and Lithothamnion. 1 young specimen. This new species is closely related to Nikoides Danae Paulson, of which Nobili has given a detailed description in 1906 (in: Annal. Scienc. Nat., ge Série, Zool., T. IV, p. 79, PI. 5, fig. 1 — 1 ƒ) : it differs evidently by the different form of the rostrum and of the simple leg of the ist pair !). The largest of the 5 specimens, which is considered as the type, is the ova-bearing female from Stat. 260, that measures 42 mm. from tip of rostrum to tip of telson. The carapace, rostrum included, is 13,3 mm. long and without the rostrum 10,2 mm.; it is 5,5 mm. high, appears therefore nearly twice as long as high and half as long as the abdomen. The slender rostrum, which in the younger female from Stat. 274 appears as long, but in the other specimens (Fig- 5°^ 5oc) a Httle shorter than the eyes and which in the ova-bearing female measures about one-third the rest of the carapace, projects horizontally forward in a line with the straight upper border of the carapace, though the tip appears in the largest specimens slightly curved down- ward; the rostrum is compressed, the lower border, in a lateral view slightly convex 1) The description of Nikoides pontica Sowinsky in the "Mémoires Soc. Sciences Kieff, 1882", could not be consulted, because these memoirs are not found in any library of Holland, as far as I am avvare. SIEOGA-EXPEDITIE XXXlXa11. 25 194 proximally, slightly concave in i t s anterior half, shows therefore its greatest height ncar the base, a little less than one-sixth the length, and gradually becomes lower anteriorly. Both the upper and the lower border of the rostrum end in a small acute tooth; that of the upper is half as long as the tooth into which terminates the lower, reaches not so far forward and a tuft of setae are implanted in the notch between the two teeth. According to the figures in Paulson's work (Recherches sur les Crustacés de la Mer Rouge, Kieff, 1875, PI. XIV, fig. 5) and in that of Nobili (1. c. PI. 5, hg. 1) the rostrum of Nikoides Datiac shows a different form, the lower margin appearing slightly concave along its whole length and the apical teeth being comparatively larger. Outer orbital angle rounded or obtuse, antennal spine small, acute, antero-inferior angle of carapace rounded. Carapace smooth, without furrows. The abdomen, which, without the telson, appears nearly 4-times as long as the 3rJ somite is high, is also smooth and closely resembles that of Proc. canaliculata Leach, four specimens of which from the Gulf of Naples are lying before me. Like in this species the straight lower margin of the pleura of the 5th somite terminates posteriorly in a minute acute tooth, while there are two spines at either side of the 6th, one on either side of the posterior margin, the other at the posterior extremity of the lower. The telson (Fig. 50^), which in the largest specimen appears half as long as the carapace, rostrum included, and nearly one-third the rest of the abdomen, tapers rather considerably backward, more than that of Proc. canaliculata; the greatest width, anteriorly, is a little more than one-fourth the length and 3,7-times as broad as that of the tip; the telson is distinctly grooved, but the groove fades away at the anterior sixth and it appears setose along its whole length. The dorso-lateral spinules are 0,32 — 0,34 mm. long; the distance between the anterior pair and the posterior margin of 6th somite measures in the egg-laden female from Stat. 260 a little more than one-third the whole length, in the larger female from Stat. 274 slightly more than twö-fifths, but in the younger specimens one-third or one-fourth, while the distance of the posterior pair from the 6th somite measures in the female from Stat. 260 a little more than half, in the younger specimens two-thirds the length of the telson. On each side the tip (Fig. 50 tf) of the telson bears 2 spines, of which the inner is 3-times as long as the outer; between the two inner spines one observes at either side 4 setae, the lower of which is feathered and as long as these spines, while the three others, implanted on the upper side of the rounded apex, are shorter and simple. The specimen from Stat. 7 1 shows, as regards the tip of the telson (Fig. 50/), a remarkable variety: between the two inner spines occur three other ones of sub- equal length, about half as long as the former, and feathered. Eyes large, contiguous, almost as broad as long. Antennular peduncle slender, distance from the orbital margin to the far end of basal article one-third longer than the 2nd and 3ld joint combined; ist joint deeply excavate, 2 nd joint in the female from Stat. 260 3, 4-times as long as thick and twice as long as 3"1; stylocerite very short, lamellate, concave above, with sharp rounded anterior margin. Second joint of antennal peduncle unarmed, peduncle reaching to the distal third or fourth of the 2nd joint of that of the upper antennae; scaphocerite a trifle longer than the antennular peduncle, nearly half as long as the carapace, rostrum included — 7,2 mm. long in the female 195 from Stat. 260 — 6-times as long as broad, terminal spine (Fig. 50/) of the outer margin not reaching beyond the obtuse tij) of the blade and curved toward it. In the specimen from Stat. 71 the terminal spine (Fig. 507') projects, however, straight forward beyond the tip of the lamella. The external maxillipeds project by the ultimate and almost the whole penultimate joint beyond the antennal scale; the ultimate joint is distinctly shorter than the [penultimate and both together measure a little less than two-thirds of the antepenultimate; the exopodite extends about to the middle of the latter. The chelate leg (Fig. 50^) of ist pair agrees with Paulson's lïgure 5/; of Niköides Danae: in the ova-bearing female the merus of this leg that extends by the fingers beyond the antennal scale, is 7-times as long as broad, the carpus, 21/2-times as long as thick, measures a little more than one-third of the merus, the palm, finally, almost one and a half as long as the fingers, is slightly shorter than the carpus. According to Nobili's description, however, the merus should be, in Paulson's species, twice as long as the carpus. The left simple peraeopod (Fig. 50//) has, unfortunately, not been figured by Paulson and his russian description is unintelligible for me: Nobili's figure 1/, however, of this leg differs much from our species and therefore the latter is described as new. The merus, indeed, appears in the largest specimen from Stat. 260 eight-, but in Nobili's figure only five-times as long as broad in the middle; the carpus, which in this figure appears 21/s-tirnes as long as thick distally and more than half as loncr as the merus, shows in the female from Stat. 260 a much more slender for in, likè the merus, being 4-times as long as thick distally and measures not yet two-fifths the length of the preceding joint; the propodus, finally, in Nobili's figure almost as long as the merus, appears in the specimen from Stat. 260 not yet half as long as the latter. In the younger female from Stat. 274 and in that from Stat. 71 the simple leg is wanting, in the specimen from Stat. 282, which is very young, only 10 mm. long, the propodus appears slightly more than half as long as the merus. In both peraeopods of the ist pair the exopodite reaches almost to the middle of the merus. In the ova-bearing female only one leg of the 2nd pair is preserved. The ischium is 6,6 mm. long and bears along the proximal third a dilatation, which is about half as broad as long. Merus 5,3 mm. long, slightly shorter than the ischium, and obscurely subdivided into 9 joints, of which the ist or proximal is the longest, measuring one-fourth the length of the joint; the following become gradually shorter, but the last joint is as long as the two preceding together. Carpus 10,5 mm. long, twice as long as the merus and subdivided into 27 annulations, that are short and subequal, except the ist and 2nd proximal ones that are longer, while the last is as long as the two preceding together. Chela 1,75 mm. long, one-sixth of the carpus, fingers distinctly shorter than the palm which is twice as long as broad. By analogy with the female from Stat. 71 this leg is certainly the shorter one. In the two specimens from Stat. 274 the 2nd legs are lost. In the female, long 18 mm. from Stat. 71, the left shorter leg reaches by the chela and half the carpus beyond the antennal scale, the longer right leg by the chela, the carpus and one-fifth of the merus. Of the shorter leg the merus is 2,1 mm. long and sub- divided into 7 joints, of which the proximal or ist is the longest, twice as long as the 2nd, while the following are subequal ; the carpus is 4 mm. long, nearly twice as long as the merus, 196 with 22 segments of which the last is as long as the two preceding ones; chela 0,75 mm. long, palm 0,42 mm., fingers 0,33 mm. Of the Jonger leg the merus is 3,3 mm. long with 23 segments, of which the ist is 21/„-times as long as the 2"d; carpus long 6,2 mm., almost twice as long as the merus and one and a half as long as the carpus of the other leg, with about 50 segments, of which the last is as long as the two preceding together; chela long 0,52 mm., palm long 0,28 mm., fingers 0,24 mm. The peraeopods of the 3rd pair reach in the largest specimen by the dactylus, the propodus and four-fifths of the carpus beyond the antennal scale, those of the 4th by the dactylus, the propodus and the whole carpus, those of the last pair, like the 3ld, by the dactylus, the propodus and four-fifths of the carpus, while these legs of the 5th pair project by the dactylus and half the propodus beyond the legs of the 3rd pair. Like in Nikoides Danae 2 spines exist on the ischium of the 3"1 and 4th pair, one near the proximal, one near the distal end; the merus of the 3ld pair is armed with 4, that of the 4th with 5 spines ; the last pair of legs are quite unarmed. In the largest specimens the propodus of the 5th pair is still a little shorter than the carpus, but in the female from Stat. 71 the propodus is one-third longer, like in Nikoides Danae, according to Nobili. The dactyli measure in the largest specimen one-third of the propodi, in the larger female from Stat. 274 they are a little longer, in the female from Stat. 71 a little shorter than one-third of the preceding joint. In the other specimens the three last legs are wanting or incomplete. In the ova-bearing female the inner branch of the 2nd pleopod is 6-times as long as broad, has therefore a rather narrow shape and bears, at the proximal third, a well-developed stylamblys that measures o n e - f i f t h the length of the branch ; the stylamblys is furnished at the tip with about 20 cincinnuli of the usual form and is about 9-times as long as thick; the outer branch has the same shape as the inner and is but a trifle longer. Eggs small, numerous, 0,46 — 0,5 mm. long. The larger female from Stat. 274, that has been figured, is 25,2 mm. long, from tip of rostrum to tip of telson, the carapace, rostrum included, 8,1 mm. long and 3,5 mm. high, abdomen 17,1 mm. long. The ova-bearing female from Stat. 260 was wrapped in a felt-like tube, similarly as Alphcus frontalis H. M.-Edw. ; examined under the microscope, the tube was apparently formed by small particles, Foraminifers, microscopical shells etc. T a b 1 e of Measurements in millimeters. Length of the telson Width of the telson proximally Width of the tip of the telson Distance of the anterior pair of spinules from the posterior border of 6* somite Distance of the posterior pair of spinules from the posterior border of 6th somite Length of the merus of the chelate leg .... Width » V » „ „ „ • • • • Length of the carpus „ „ „ ...... I 2 3 4 2,8 6,5 3.64 2>7 0,8 i.7 1,08 0,78 0,28 0,46 0,32 0,26 0,72 2.3 1,56 0,9 i.7 3.76 2,56 i.7 2,4 6,7 4.1 2,9 0,48 1 0,68 o,53 0,84 2,5 i>5 1,05 5 1.9 0,5 0,17 0,58 1,16 i97 Width of the distal end of this carpus . Length of the chela Length of the palm Length of the fingers Length of the merus of the simple leg . . Width „ „ „ „ „ „ v . . Length of the carpus „ „ „ , . Width of the distal end of this carpus . Length of the propodus of the simple leg. Width of the propodus „ , „ „ . Length of the dactylus B „ „ „ . Length of the merus of third leg . Length of the carpus „ „ „ . Length of the propodus „ „ „ . . . Length of the dactylus „ „ „ . Length of the merus of fourth leg Length of the carpus „ „ v . . Length of the propodus „ „ „ Length of the dactylus „ „ „ Length of the merus of fifth leg . . . Length of the carpus „ B „ . . . Length of the propodus „ „ „ . . . Length of the dactylus „ „ n . . . I 2 3 4 5 0,42 0,92 0,6 o,43 1,6 3.6 2,4 1,76 1 2,1 1,5 1,04 0,6 i>5 o, 9 0,72 7,4 4,4 1,8 0,92 0,52 0,275 2.7 1,7 0,76 o,7 0,38 0,22 3 2 1,38 0,64 0,37 1,06 1 0,56 0,32 2,16 7>i 4,2 2.7 8,4 5 1,6 3.5 2,24 o,45 1,2 0,82 2,5 9-4 5,7 3 u,8 7,5 2,16 5-9 0,6 i,8 2 9.3 5,4 i>5 8,5 4,96 2 7.3 4,24 0,58 2.35 i,7 N° 1, Stat. 71 ; N° 2, Stat. 260; N° 3 and 4, Stat. 274; N° 5, Stat. 282. Processa Leach. Thirteen species of this genus have hitherto been described, but some must, no doubt, be considered as invalid or as synonyms. Processa Couckii Bell from off the Cornwall coast and from off Great Yarmouth was, as has been several times suggested, probably founded on an abnormal specimen of the common Proc. canaliculata Leach : both the type and the only other specimen known are, unfortunately, lost. Proc. sintiolata (Risso) from Nice has not been found back since its first description in 18 16: a specimen from Nice, that once belonged to the collection of Dr. Leach, exists, however, in the British Museum, according to Gray's "List of the specimens of Crustacea in the collection of the British Museum, London 1847" an(^ it appears therefore desirable that a new detailed description of this rare animal should be published. A third species, Proc. mediterranca, from Nice was described in 19 15 by B. Parisi (in: Monitore Zoolog. Italiano, Anno XXVI, N° 3, p. 65), but in the reprint which I had the honour to receive from him, the author wrote in 1918 with his own hand "non è nuova, ma è la Processa canaliculata Leach (= N. edulis)". Proc. macrog7iatJia (Stimps.) from Hong Kong, only known by Stimpson's short diagnosis, is perhaps identical with the common european species, which is also recorded from Nagasaki and other japanese localities; it should differ from it by the stouter shape of the body and the shorter rostrum, but just in these characters Proc. canaliculata is known to vary. Proc. canaliculata Leach, the type species of the genus, shows an almost cosmopolitan 198 distribution. This species, indeed, occurs in the eastern Atlantic from the south coast of Norway to Cape Town and Kast London, in the Mediterranean, the Adriatic and the Black Sea, also in the western Atlantic from off North Carolina and the Bermudas to the Gulf of Mexico, Porto Rico and Trinidad; it was recorded from Ceylon and Japan and is distributed on the west coast of America from San Diego, California, to Panama Bay. Still another species is known from the Gulf of Gascony, viz. : Proc. platyura (Fischer), which, however, as far as I am aware, has not been found elsewhere. The other species are confined to the Indopacific. In the Red Sea Proc. aegu iwana (Pauhon) and Proc. Coutierei Nobili are found, in the Gulf of Martaban occurs Proc. processa (Bate), and Proc. macrognatha (Stimps.) from Hong Kong was recorded by the author of this Report from the Mergui Archipelago; besides Proc. canaliculata still two other species, Proc. japonica (de Haan) and Proc. processa (Bate), are known from Japan, the Hawaiian Islands are inhabited by Proc. hawaicnsis (Dana) and Proc. processa (Bate), while four or perhaps a few more species are distributed throughout the Indian Archipelago, viz. : Proc. processa (Bate), Proc. japonica (de Haan), Proc. australiensis Baker and the forms that will be described under the name of Processa sp. Two species, finally, are known from the South Australian coast, Proc. austra- liensis Baker and Proc. o-racilis Baker. Concernino- the vertical ranste of Proc. canaliculata Leach Mr. Stanley Kemp in his valuable work "The Decapoda Natantia of the Coasts of Ireland" remarks that it is found off the Irish Coast between 3 and 199 fathoms, but that it is apparently of rare occurrence outside the ioó fathom line. Off the american coasts it ranges from shallow water to 1 1 1 fathoms (Rathbun), while in the Mediterranean it has been recorded from depths of 2 1 6 fathoms (Senna) and 326 fathoms (Adensamer). The indopacific species occur in shallow water, as far as their vertical range is known ; the greatest recorded depth is 7 1 fathoms, at which Proc. processa was taken in Japan; one species was obtained on the N. W. coast of Waigeu-island at 45 and another off the Hawaiian Islands between 2 1 and 43 fathoms, but often species were taken in more shallow water and on the reef. LIST OF THE SPECIES OF PROCESSA Leach, KNOWN AT PRESENT. SPECIES HABITAT DEPTH IN FATHOMS aequimana (Paulson) 1875 . . Red Sea australiensis Baker 1907 . . . South australian coast East coast of Aru-islands 7 Kei-islands 12 Anchorage off North-Ubian 9 — 12 Sulu-archipelago 7-8 Pulu Kaniungan Ketjil Reef Makassar Up to 17 South of Saleyer 4 Paternoster Islands 6, up to 20 Batjulmati (Java). Reef 199 SPECIES HABITAT DEPTH IN 1 ATHOMS -^ canaliculata Leach 1 8 1 5 ... From the south coast of Norway to the Mediter- In the Mediterranean ranean and Adriatic, including the Black Sea at depths of 216 and 326 Off Madeira 15 Canary Islands Cape Verde Islands Nyanga-river, French Congo 8 Musserra, Angola 5 South Africa between Cape Tovvn and East London 10 — 40 Ceylon Japan San Diego, California Off Abreojos Point, Lower California 48 Gulf of California 29—/1 Panama Bay 5i'/. From off North Carolina and the Bermudas to the Gulf of Mexico, Porto Rico and Trinidad -±Couchii (Bell) 1853 Off the Cornwall coast Great Yarmouth Coutièrei Nobili 1904 Djibouti gracilis Baker 1907 South australian coast hawaiensis (Dana) 1 852. . . . Hawaiian Islands japonica (de Haan) 1849 . . . Japan (Bay of Tokio, Kadsiyama, Nagasaki) Makassar Up to 17 Between Misool and New Guinea i/ Saleh-bay Up to 20 macrognatha (Stimp s.) 1S60 . Hong Kong Mergui Archipelago 8 platyura (Fischer) 1 S72. . . . Cap Breton (Bay of Biscay) 28 processa (Bate) iS8£ Amboina Singapore Gulf of Martaban 15 Hawaiian Islands Reef. 21-43 Dzushi, Japan 7i sinuolata (Risso) 18 16 Nice sp. Stebbing 19 18 . Off Vetch's pier, Durban From the sponge Cerao chalinus. sp. de Man 191 8 . Anchorage off Djangkar (Java) 5 Sulu-archipelago 8 Sulu-island 7 N. W. coast of Waigeu-island 45 East coast of Sula Besi 12 West coast of Great-Kei-is!and 15 1. Processa australiensis Baker. PI. XVII, Fig. 51 — 51 m . Processa australiensis W. H. Baker, Notes on South Australian Decapod Crustacea, Part V, in: Trans. Royal Soc. South Australia, Vol. XXXI, 1907, p. 185, PI. XXV, figs. 2 — 2e. ? Ni'ca macrognatha W. Stimpson, Proc. Acad. Nat. Sciences Philadelphia, 1860, p. 26. 200 Stat. 7. March 11. 7°S5'.SS., 114° 26' E. Reef of Batjulmati (Java). 1 male and 1 young female. Stat. 40. April 2. Anchorage off Pulu Kawassang, Paternoster-islands. 12 m. Bottom coral- reef. 2 very young specimens, probably belonging to this species. Stat. 66. May y/S. Bank between islands of Bahuluvvang and Tambolungan, south of Saleyer. 8 m. Bottom dead coral ; Halimeda; Lithothamnion. 1 egg-laden female. Stat. 71. May 10 — June 7. Makassar. Up to 32 m. Bottom mud. Sand vvith mud. Coral. 2 ova-bearing females. Stat. 89. June 21. Pulu Kaniungan Ketjil. Reef. 1 egg-bearing female. Stat. 96. June 27. South-east side of Pearl-bank. Sulu-archipelago. 15 m. Lithothamnion- bottom. 1 egg-bearing female. Stat. 99. June 28/29/30. 6°f.$ N., I20°26'E. Anchorage of North-Ubian. 16 — 23 m. Litho- thamnion-bottom. 2 young males. Stat. 109. July 5/6. Anchorage off Pulu Tongkil, Sulu-archipelago. 13 m. Lithothamnion- bottom. 1 ova-bearing and 1 young female. Stat. 258. Dec. 12/16. Tual-anchorage, Kei-islands. 22 m. Bottom Lithothamnion, sand and coral. 3 young specimens. Stat. 273. Dec. 23/26. Anchorage off Pulu Jedan, East coast of Aru-islands. 13 m. Bottom sand and shells. 1 full-grown ova-bearing female. Stat. 315. Febr. 17/18, 1900. Anchorage East of Sailus Besar, Paternoster-islands. Up to 36 m. Bottom coral and Lithothamnion. i egg-bearing female. Unknown Station. 1 young specimen. These specimens agree very well with Baker's detailed description and belong certainly to this species, but it appears to me probable that Stimpson's Nica macrognatha is identical, because his description or diagnosis is also applicable to these specimens : I preier, however, to refer them to Proc. australiensis, on account of the detailed description of the latter. The ova-bearing female from Stat. 273 is 15,5 mm. long from tip of rostrum to tip of telson, while Baker indicates a length of 16 mm., omitting rostrum and telson : rostrum, carapace, abdomen without telson and telson are in this female respectively 0,9 mm., 3,75 mm., 8,6 mm. and 2,25 mm. long. The rostrum that reaches to the middle of the eyepeduncles and that is directed horizontally forward in a line with the straight upper border of the carapace, appears at its base nearly as broad as it is long and slightly depressed, but soon narrows to form an acuminate and compressed spine; of the rostrum that measures one-fourth the length of the rest of the carapace, both the upper and the lower margin end (Fig. 51^) in a sharp spine, between which a few setae are implanted, while the lower spine reaches a little farther forward than the upper; in a lateral view the height of the rostrum proves to be about one-sixth the length and the lower margin appears in die middle slightly convex, at the base slightly concave. The carapace, which, without the rostrum, measures one-fourth the entire length, is slightly depressed, hardly higher than broad, the height (2,56 mm.) being in proportion to the width (2,4 mm.) like 1 : 0,94 and the carapace appears one and a half as long as high; carapace perfectly smooth, antennal spine acute but very small, antero-inferior angle of carapace rounded. The pleura of the ist abdominal somite are rounded anteriorly, not "somewhat acutely", as we read in Baker's description. The telson (Fig. 5 1 d), grooved longitudinally, measures l/7 the entire length of the body and is 3-times as long as broad proximally, while the width at base is in proportion to that of the tip like 2,7 : 1 ; the anterior pair of dorso-lateral spinules that are 0,19 mm. long, 1/13 the length of the telson, are implanted at one-fifth the length from the base, the posterior pair that show the same length, just behind the middle. The uropods are ;oi both longer than the telson, the outer lobe of the peduncle is rounded, but the inner ends in a small acute spine; the outer margin of the external uropod, slightly convex anteriorly, slightly concave posteriorly, ends in a small spine; the diaeresis is armed with two triangular acute teeth of equal si ze, one at the outer, one at the inner side, that are just as long as broad at their base, projecting forward, though not reaching to the middle of the terminal lobe of the uropod. The terminal segment of the ocular peduncle is hardly longer than wide, the distinctly, though hnely, faceted corneal surface occupies half the length of the segment, while the proximal half is slightly flattened; ocellus absent, but the clark blue pigment of the eye extends a little on the outer side of the peduncle. First segment of antennular peduncle a little longer than the two following taken together, 21"1 one and a half as long as thick and just as long as 3rd; stylocerite short, shorter than the eyes, obliquely truncate at the tip. Second joint of antennal peduncle with a small subacute tubercle (no spine) on the lower side, peduncle and scaphocerite (Fig. 5 i ƒ) agree with Baker's description and figures. The external maxillipeds hardly extend beyond the thicker upper antennular flagellum, but the antepenultimate joint not yet, though almost, attains the distal extremity of the scaphocerite; in Baker's fïgure 2, however, this joint r'eaches distinctly beyond the antennal scale, but in the ova-bearing female from Stat. 89 the scaphocerite appears also a little shorter than the antepenultimate joint ; the two last joints are subequal in length and together a little shorter than the antepenultimate, the proportion being like 28 : 33. Merus of the chelate leg (Fig. 51^) of the ist pair 3-times as long as broad in the middle, almost 3-times as long as the carpus, which has a stout shape, the proportion between length and wiclth being like 4:3; palm one-fifth longer than carpus, fingers as long as the palm. Merus of the left simple leg (Fig. 51//) of the ist pair little longer than that of the chelate and 4-times as long as wide ; length of the carpus one-third that of the merus, carpus of a less stout shape than in the chelate leg, the proportion between length and width being like 5:3; propodus twice as long as the carpus, 31/2-times as long as broad, dactylus one-third of propodus. The right leg of the 2nd pair reaches by the chela and the two last joints of the carpus beyond the external maxillipeds, the left leg extends to the distal third of the ultimate joint. The suture on the ischium of the right leg, that Baker describes, is situated a little behind the middle, the expansion on the proximal part is tipped with 4 recurved setae; the merus is 2,06 mm. long, a little longer than the ischium, the 5 — 7 annuli are hardly perceptible, the carpus, 3,6 mm., is one and three-fourth times as long as the merus (Fig. 512') and divided into 19 or 20 joints, of which the ist is 2y3-times as long as thick clistally, those in the middle a little broader than long, the last a little longer than broad; the chela measures ^s of the carpus, is a little more than twice as long as wide and the gaping fingers are slightly shorter than the palm. The expansion on the ischium of the slightly shorter left leg bears only 3 recurved setae ancl the suture lies also behind the middle; the merus is 1,7 mm. long, its segments are still more obscure than in the right leg; the carpus, 2,67 mm., is about one and a half as long as the merus (Fig. 517') and dividecl into 12 segments that resemble those of the other leg; the S1BOGA-EXPEDITIE XXXIX «'. 2° 202 chela measures one-fifth of the carpus, is about 3-times as long as broad and the fingers hardly shorter than the palm. The three posterior legs, of which the measurements are indicated in the Table, agree with Baker's description. Eggs small, larger diameter 0,45 mm. The male from Stat. 7 is about 13 mm. long from tip of rostrum to tip of telson. The rostrum reaches to the middle of the cornea of the eyes and the antennal spine is well-developed, larger than in the female from Stat. 273. Of the 2nd pleopod (Fig. 51/*, 51/, 5 1 w) the tvvo branches are narrow, the endopodite ]/7 shorter than the other; stylamblys with well-developed cincinnuli, implanted at the proximal third of the inner branch and measuring one-fourth its length, appendix masculina twice as long as the stylamblys with 4 pectinated setae at the tip. The egg-bearing female from Stat. 66 is only 10,5 mm. long and shows some differences from the female collected at Stat. 273, but it is difficult to say whether they are of more than varietal importance. The distal styliform part of the rostrum is absent, so that it does not yet reach to the corneal surface of the eyepeduncles. Like in Baker's type the antero-lateral border of the carapace is produced to a subacute angle just below the eyes, an antennal spine does not occur. There is no small tooth on the pleura of the 5th somite. The telson has a more slender form, being 3,7-times as long as wide proximally and the width at base is not 2,7-, but only 2,1-times as large as the width of the tip, the dorso-lateral spinules, finally, are implanted farther forward (See the Measurements). The left simple leg of the ist pair appears slightly stouter than in the female from Stat. 273, the propodus, finally, of the 5111 pair is slightly shorter than the carpus. The two egg-bearing females from Makassar agree with the female from Stat. 273, apparently in all details, but they are only 13 mm. long and the rostrum is as short as in the female from Stat. 66, not yet reaching to the cornea of the eyes. The 4th to 6'h somite of the abdomen and the telson (Fig. 5 1 e) are a' little pubescent; two fine setae instead of one are inserted on the tip at each si de of the extremity, but in the specimen from Stat. 273 these setae, like those on the lateral margins of the telson, are vvorn off. The female from Stat. 89 is almost 13 mm. long and resembles that from Stat. 273, but the antepenultimate joint of the external maxillipeds extends just beyond the antennal scale. Ova 0,45 — 0,46 mm. long. The female from Stat. 96 is 12 mm. long and shows typical charac- ters, rostrum reaching to the middle of the cornea. The two young specimens from Stat. 99 proved to be males, after the examination ot their 2nd pleopod; owing to their young age the stylamblys appears comparatively shorter than in the male from Stat. 7. The ova-bearing female from Stat. 109 is but 11 mm. long, like that from Stat. 315. Like in other Caridae the size of ova-bearing females of this species varies rather much, namely between 1 1 and 1 7 mm. Proc. australiensis Baker bears a close resem blance to the european Proc. canali- culata Leach, 4 adult specimens of which from the Gulf of Naples are lying before me, Baker's species, however, apparently differs by its much smaller size — but there are probably 20' still other slight differences. According to Stanley Kemp (in : Fisheries, Ircland, Sci. Invest., 1908, I [1910], p. 124) in /'roe. canaliculata the rostrum falls slightly short of, or extends a little beyond the eye; in Proc. australiensis, however, it does not reach to half the length of the ophthalmopods (Baker) or reaches, like in the "Siboga" specimens, to the middle of the eyepeduncles or even to the middle of the cornea, but extends never beyond the eye. The antennal spine is well-developed in Proc. canaliculata and the pleura of the 5"1 somite are armed \vith 2 or 3 small acute teeth, in Proc. mistraliensis only with one, though the development of 2 or 3 teeth may be owing to the much larger size of the specimens from Naples. The measurements of the telson and of the three posterior legs of a female, long 34 mm., of Proc. canaliculata from the Gulf of Naples accord, as regards their relative proportions, with those of Baker's species (See the Table of Measurements). I, finally, wish to add that the rostrum of Proc. canaliculata closely resembles in a lateral view that of Proc. australiensis, with two sharp teeth at the apex, of which the lower is twice as long as the upper and with a few setae between both; in three of the Naples specimens the rostrum shows these characters, but in the fourth, the largest of all, 40 mm. long, it terminates in a single acute point. Proc. aequimana (Paulson) from the Red Sea is likewise a related form. Table of Measurements in Length of telson Width of telson at base Width of tip of telson Distance of the anterior pair of dorso-lateral spinules from the base Distance of the posterior pair of dorso-lateral spinules from the base Length of merus of y& pair „ carpus „ „ „ propodus „ „ „ . dactylus „ „ „ . merus of 4th pair. carpus B „ „ . propodus „ „ „ . dactylus „ ,, „ . merus of 5'h pair. carpus „ , „ . propodus „ „ „ . dactylus „ „ „ . mi 11 mieters. 1 2 3 4 5 2,1 i.7 1,8 '-75 2,2 0,56 0,46 0,62 o,54 0,/6 0,24 0,22 0,24 0,25 0,285 0,6 0,26 0,4 0,4 0,44 i-3 o,74 1,08 1,04 1,1 . i.4 1,8 1,6 2 . 1,6 1,9 i,6 2,06 1,1 i,3 1,2 i,4 o,35 o,35 o,33 0,4 2,1 1,6 2,1 1,85 2,4 2,6 2 2,55 2,25 2,9 i>9 i»4 1,8 L7 2 o,47 0,4 o,47 0,42 0,58 1,5 r,8 1,6 2,1 i,3 i,5 1,4 1,84 1,2 1,6 i,5 L9 o,33 0,47 0,42 0,56 6 5,2 1,6 0,68 1,25 2,9 4,8 5,7 3-4 1 5,5 7,i 4,5 i>3 4,3 3,7 3,4 N° 1 Stat. 7; N° 2 Stat. 66; N" 3 Stat. 71 ; N° 4 adult female from Stat. 109; N" 5 Stat. 273; N° 6 female, without eggs, long 34 mm., of Proc. canaliculata Leach from the Gulf of Naples. General distribution: South Australian coast (Baker). 2. Proccssa sp. PI. XVII, Fig. 52 — 52/". Stat. 4. March 9. 7°42' S., H4°i2'.6E. Anchorage off Djangkar (Java). 9 m. Bottom coarse sand. 1 young male and 1 ova-bearing female. 204 Stat. 96. June 27. South-east side of Pearl-bank. Sulu-archipelago. 15 m. Lithothamnion- bottom. 1 egg-bcaring female. Stat. 104. July 2 3. Sulu-harbour, Sulu-island. 14 m. Bottom sand. 1 specimen. Stat. 154. Aug. 14. o°7'.2 N., I30°25'.5E. N.W.-coast of Waigeu-island. 83 m. Bottom grey muddy sand, sliells and Lithothamnion. 1 young female. Stat. 193. Sept. 13 '' 14. Sanana-bay, East coast of Sula Besi. 22 m. Bottom mud. 1 almost ad uit female. Stat. 261. Dec. 16/18. Elat, west coast of Great-Kei-island. 27 m. Bottom mud. 2 young males. I not succeed in identifying these specimens with any one of the described species, thev may even perhaps prove to belong to three or four different forms. The largest specimen, that from Stat. 193, is 21,5 mm. long, but the three posterior peraeopods are wanting or incomplete; the other specimens are considerably smaller, though one of them is laden with eggs. The specimens not fully agree in some minute details, as e. g. the shape of the carpal segments of the legs of the 2"d pair, the position of the dorso-lateral spinules on the telson etc, so that under these circumstances it appears more adequate to describe these specimens without referring them to a known species. Dr. Balss rightly remarks that a revision of the species of Processa is verv destrable (Ostasiatische Decapoden II, 19 14, p. 60). The female from Stat. 193 is 21,5 mm. long (rostrum 1,64 mm., carapace 4,92 mm., abdomen with telson 15 mm.). The greatest height laterally of the carapace is 2,85 mm., so that the carapace, rostrum included, proves to be 2y„-times as long as high. The rostrum, (Fig. 52, 52^, 52^), almost as long as the eyes, extends horizontally forward, but the acute apex of the upper margin is slightly curved downward ; the acute spine or tooth at the end of the lower border reaches a little farther forward than the apex of the upper and in the notch between both teeth a few setae are implanted ; looked at from above the rostrum appears styliform, gradually tapering forward from the slightly wider base, and in a lateral view it appears also rather low, clecreasing in height distally. Outer orbital angle rounded. Antennal spine well-developed. Antero-inferior angle of carapace rounded. Carapace smooth, 3-times as long as the rostrum. The abdomen, also smooth, is nearly 3-times as long as the carapace without the rostrum. Abdominal pleura rounded, that of the 5th somite entire, not toothed, postero-inferior angle of the 6th somite acute. The telson, 3 mm. long, (Fig. 52^, ^id, 52c) measures one-fifth the whole length of the abdomen and is about half as long as carapace and rostrum combined ; it tapers rather strongly, the width of the tip being only one-third that of the base, and it is slightly grooved longitudinally ; dorsodateral spinules large, the anterior pair at 1L the length of the telson from the base, the posterior pair on the middle; of the 2 terminal spines, at either side of the subacute apex, the inner one is the longest, 3-times as long as the lateral, and between the two long spines tvvo fïnely and closely feathered setae are implanted that are nearly just as long. Eyes large, fiattened ; a small dark-coloured ocellus, that occurs in a species from the Hawaiian Islands, referred by Miss Rathbun to Processa processa (Bate), could not be observed i.M. J. Rathbun, The Brachyura and Macrura of the Hawaiian Islands, 1906, p. 912). Antennular peduncle si en der, basal joint a little longer than the two following taken together; 2nd joint 5-times as long as thick and twice as long as 3rd. A stylocerite does not occur. 205 Antennal scale narrow, as long as the antennular peduncle; outer margin straight, terminal spine not or hardly reaching bevond the lamella; in Batf.'s figure of Proc. processa (Report Challenger Macrura, Plate XCV, hg. c) the spine is much shorter, perhaps rudimentary. Antennal peduncle a little longer than the basal joint of that of the inner antennae, spine at the antero-inferior angle of 2nd joint very small. The antennal scale, which in this specimen is 3,84 mm. long, measures about three-fourths the length of the carapace without the rostrum and one-fourth the length of the body. The external maxillipeds (Fig. 52/*) reach bevond the antennal scale by the terminal joint and one-third of the penultimate; these two joints are of equal length, respectively 1,84 mm. and 1,8 mm. long, and together about one-tifth shorter than the antepenultimate. They resemble the outer maxillipeds of Proc. processa (Bate) (1. c. Fig. 1), but I would remark that in the fioaire 1 i of this author the two joints appear together one-third shorter than the antepenultimate. The merus of the right chelate leg of the ist pair (Fig. 52^) reaches to the middle of the eyes; in a lateral view the carpus appears 21/,-times as long as thick at the distal extremity, palm just as long as carpus, fingers one-third shorter. The merus of the left leg (Fig. 52//1 is slender, 8-times as long as broad, carpus a little longer than one-third of the merus, 4-times as long as thick at the distal extremity, propodus half as long as the merus, almost 6-times as lono- as broad proximally, distinctly narrowing, dactylus almost one-third of the propodus. Of the right leg of the 2nd pair (Fig. 52/) the merus extends to the far end of the antennal peduncle and this leg projects by the chela and two-fifths of the carpus bevond the antennal scale; it remained uncertain whether the merus is subdivided or not, the carpus, almost twice as long as the merus, has about 20 articulations, that are longer than broad, those in the middle twice as long as broad, the last segment almost twice as long as broacl and nearly as lono; as the two preceding together, that are but little longer than broad ; the chela measures almost one-sixth of the carpus and is four-times as long as broad, fingers hardly shorter than palm. Of the left leg of the 2nd pair the merus reaches to the middle of the eyes, while only the chela and the last joint of the carpus project beyond the antennal scale; the proportion between merus and carpus is like 4:7, the merus probably subdivided; the carpus has 15 segments, the ist or proximal measures nearly one-sixth the length of the joint and is 5-times as long as thick, the 3rd 2y.,-times as long as broad, those in the middle one and a half as long as thick, the following relatively still shorter, the penultimate even a little broader than long, the last segment one and a half as long as thick and as long as the two preceding taken together; the chela measures one-sixth of the carpus and is 3-times as long as broacl, hngers slightly longer than palm. The following legs are wanting or incomplete; of those of the 31'11 pair the merus reaches as far forward as the ist joint of the antennular peduncle and the merus of the 4lh pair extends but little farther. The branches of the 2nd pleopod are narrow, the inner little shorter than the outer; the stylamblys with well-developed cincinnuli measures about one-fourth the length of the endopodite. At first I was inclined to refer this specimen to Proc. processa (Bate), but according to Bate's figure / the carpal segments show a different form, being not or hardly longer than wide. 20Ó The form, however, referred by Miss Rathbun (1. c.) to Proc. processa, belongs in my opinion to another species on account of the much larger number of carpal segments and of the eyes being furnished with a small but distinct ocellus. The young male from Stat. 4 is only about 9 mm. long. The merus of the left simple foot (the right chelate leg of the ist and 2nd pair and the legs of the 4th and 5,h pair are lost) is 1 mm. long; the carpus, 0,36111111. long and 0,14 mm. thick distally, lias a stouter shape than in the preceding specimen, like also the propodus, which, 0,52 mm. long, is but 3-times as long as broad. Proportion between merus and carpus of the left leg of the 2nd pair like 3:5; carpus (Fig. 52/) with 10 segments, which, excepting the ist and the last, are about as long as thick; the chela measures one-fourth of the carpus and lias a stouter shape than in the preceding specimen, being only twice as long as broad, fingers a little shorter than palm. As results from the Table of Measurements the dorso-lateral spinules of the telson are situated more back war d than in the specimen from Stat. 193, with which it agrees for the rest. Endopodite of 2nd pleopod a little shorter than the outer branch, bearing at the posterior third a stylamblys and an appendix masculina; the latter, implanted between the branch and the stylamblys, lias 4 setae on the tip, while the slightly shorter stylamblys is provided with distinct cincinnuli. The egg-bearing female from this Station is hardly 12 mm. long and lias lost all the peraeopods, excepting the right chelate leg of the ist and the right leg of the 2nd pair. The chelate leg of the ist pair shows the same measurements as the specimen from Stat. 261, that belongs to the same species as the male from Stat. 4 and the leg of the 2nd pair agrees in its measurements with the left leg of the 2nd pair of this male, but the 9 segments of the carpus are distinctly long er than thick and the chela is a little more than 3-times as long as broad in the middle, presenting a less stout shape than in the male. The telson also differs from that of the male by its more s 1 e n cl e r form and by the dorso-lateral spinules being implanted like in the female from Stat. 193, with which is seems to agree for the rest, the rostrum being little shorter than the eyes, while the 2nd joint of the antennular peduncle is 3-times as long as thick and one and a half as long as the 3rd. Larger diameter of the eggs 0,4 mm. The egg-bearing female from Stat. 96 lias nearly the same size as the young male from Stat. 4. The carpus (Fig. 520) of the left leg of the 2nd pair has 12 segments that resemble those observed in the young male from Stat. 4, but the chela is 3-times as long as broad and the fingers are nearly as long as the palm. The right leg of the 2lld pair is hardly longer than the left, has likewise 12 segments in the carpus and resembles also in other respects its iellow. The specimen from Stat. 104 is about 12 mm. long; it is much damaged, having lost all its legs excepting one of the 3rd pair. This specimen belongs without any doubt to the same species as the female from Stat. 4, presenting the same form of telson, the same position of the dorso-lateral spinules, the same form of antennules etc. The specimen from Stat. 154 (Fig. 52/, 52/') is little longer than the egg-bearing female from Stat. 96 and belongs perhaps to a third species. The pleura of the 5th somite (Fig. 52/) bear namely a small tooth posteriorly and the dorso-lateral spinules of the telson (Fig. 527//) are placed more backward. The carpus (Fig. 52//) of the leit leg of the 2nd pair, almost twice 2o; as long as the merus, is divided into 24 segments, which, excepting the ist and the last, are all a little broader than long; the chela measures about one-fourth of the carpus and is 4-times as long as broad in the middle, while the fingers are a little shorter than the palm. This specimen belongs probably to the true Proc. proccssa (Bate). The two small specimens from Stat. 261, finally, are of the same size as the young male from Stat. 4 and belong to the same species as is proved by the left leg of the 2nd pair, which closely resembles that of the young male from off Djangkar; the carpus of this leg has, however, onlv 1 1 segments, of which the penultimate and antepenultimate are even slightly broader than long. The chela is only twice as long as broad and the fingers are slightly shorter than the palm. As regards the f o r m and the 1 e n g t h of the rostrum all the specimens resemble o n e another. The preceding observations, in connection with the measurements, render it probable that the specimens from the Stations 4 and 261 belong to the same species and that those of the three other Stations belong to three other different forms. Table of Measurements in millimeters. Length of telson YVidth of telson at base Width of tip of telson Distance of the anterior pair of dorso-lateral spinules from the posterior margin of the 6lh somite Distance of the posterior pair of dorso-lateral spinules from the posterior margin of the 6'h somite Length of the carpus of the chelate leg of the ist pair. . . Width of this carpus in a lateral view Length of the palm of this leg Length of the fingers of this leg Length of the merus of the simple leg of the ist pair . . . Length of the carpus of this leg Length of the propodus of this leg Length of the dactylus of this leg Length of the merus ) 1 „ „ „ carpus ; of the right leg of the 2»J pair . . „ „ „ chela I f . . Length of the merus 1 \ . . „ „ carpus ■ „ „ „ chela I Length of the merus „ „ carpus n i) propodus „ dactylus Length of the merus of the left leg of the 2°d pair of the leg of the yd pair carpus propodus dactylus of the leg of the 4th pair I 1 a 2 3 4 1,1 1,72 2 2 3 0,4 o,5 o,5 0,6 0,94 0,14 0,22 0,19 0,18 0,31 0,36 0,24 0,4 o,74 0,42 0,78 0,94 1,1 i,34 1,52 0,4 0,56 o,7 1 0,23 0,28 0,28 0,4 0,46 0,56 o,75 1,06 o, 34 0,42 0,46 0,72 I i.5 i.9 1 3 0,36 0,6 0,76 1,14 0,52 • 0,8 1 1,48 . • °o 0,3 0,44 1,02 i.35 2,64 i,6 2,02 4,84 ' 0,36 0,52 o,74 0,75 ' 1,26 i,44 2 1,25 1,85 2,7 3.5 0,28 0,48 '.5 0,58 2 0,58 1,06 f,5 2,56 > 0.72 1,08 i,4 0,37 o,34 1,8 2,1 'o 0,38 0,48 2,6 3.7 — »■— 0,72 ' 3 1,6 1,04 0,52 0,26 0,56 0,46 i.5 0,6 o,75 0,26 1 1.8 0,36 1,46 i,7 1 0,42 'o 2,2 '.3 o,5S 208 Length of the merus „ „ „ carpus „ „ „ propodus . dactylus )f the leg of the 5"' pair I I a 2 1,66 3 2,5 4 • • 1.5 1,48 0,32 2,4 2,2 0,82 • 5 1,62 2 1,6 0,6 \" 1 the young male, N° ia the ova-bearing female from Stat. 4; N° 2 egg-bearing female from Stat. 96; N° 3 young female from Stat. 154; N° 4 female from Stat. 193; N° 5 young male from Stat. 261. 3. Processa japonica (de Haan). PI. XVIII, Fig. 53- 00 k. Nika japonica W. de Haan, Fauna japonica, Crustacea, 1849, p. 1S4, Tab. XLVI, fig. 6 and Tab. N. Nika japonica A. Ortmann, in: Zool. Jahrb. V. Abth. f. Syst. 1S90, p. 529. Nika japonica F. Doflein, Ostasiatische Dekapoden, München, 1902, p. 641. Nica japonica H. Balss, Ostasiatische Decapoden II. Die Natantia und Reptantia. München, 1914, p. 61. Stat. 71. May 10 — June 7. Makassar and surroündings. Up to 32 m. Bottom mud. Sand with mud; Coral. 1 young male. Stat. 164. August 20. i°42'.5 S., I30°47'.5E. Between Misool and New Guinea. 32 m. Bottom sand, small stones and shells. 1 specimen. Stat. 313. Febr. 14,16, 1900. Anchorage East of Dangar Besar, Saleh Bay. Up to 36 m. Bottom sand, coral and mud. 1 young female. Upon my request Dr. J.J. Tesch, at that time Conservator at the Leyden Natural History Museum, has been so kind to examine for me the three type specimens of de Haan's Nika japonica, still preserved in that institution, viz. two specimens in a dry state, long respectively 44, S mm. and 40 mm. from tip of rostrum to tip of telson, and one ova-bearing female in spirit, long 22 mm. The largest of the three specimens, collected by the "Siboga", is that from Stat. 164, of which the sex could not be ascertained, because the pleopods of the 2nd pair are damaged ; this specimen is 28 mm. long. The carapace, rostrum included, is 9,1 mm. long, nearly one- third the entire length, and 1,9 mm. high in a lateral view, so that it shows a rather slender shape, being almost 5-times as long as high : the shape of carapace and abdomen is more slender than in de Haan's figure, but this species shows probably similar variations as Pj'oc. canaliculata Leach (vide S. Kemp, The Dècapoda Natantia of the coasts of Ireland, Dublin 1910, p. 124). The upper border of the carapace appears straight in a lateral aspect and terminates anteriorly (Fig. 53, 5317) into the triangular rostrum that is a little shorter than the eyes; the rostrum, as long as broad at base, appears slightly curved transversely, when looked at from before, and appears anteriorly obtusely carinate in the mid-dorsal line, the carina fading away in the middle; the lateral margins are also carinate and in a lateral view the rostrum appears very low, the apex obtuse. The specimen from Stat. 313, which is a little smaller, carapace and rostrum being together 7,5 mm. long, shows the same characters of the rostrum, but in the young female from Stat. 71, in which carapace and rostrum are together only 5 mm. long, the rostrum is a little longer than broad at base. Both by de Haan and Ortmann the rostrum 209 has been described as convex. Antennal spine acute, small. Antero-inferior angle of carapace rounded. Carapace smooth, without grooves. Abdomen smooth, rounded, anterior and posterior angles of the pleura rounded or obtuse, those of the 5th and 6th somite without teeth or spines. Telson of the specimen from Stat. 164 5.7 mm. long, one-fifth the whole length, strongly tapering backward, the width (0,28 mm.) of the tip being only one-fifth that of the base; the telson is rounded transversely, not "rooved longitudin all y, pubescent and it appears unarmed to the naked eye, while only by means of the microscope the two pairs of rudimentary, very small spinules can be observed, that are only 0,08 mm. long, the anterior pair situated at the anterior third (at 1.8 mm. from the base), the posterior pair just behind the middle (at 3,5 mm. from the base). In the specimen from Stat. 313 the telson tapers a little less strongly, the width of the tip beinor one-fourth that of the base; for the rest it resembles that of the specimen from Stat. 164, but the dorso-lateral spinules are hardly perceptible even by means of the microscope and the posterior pair is situated more backward, at the posterior fourth. At either side the tip bears two spinules, the outer very short, the inner only as long as the tip is broad, conformable to de Haan's description "spinulis apicalibus valde abbreviatis". In the youngest specimen, the female from Stat. 71, the telson is 2,7 mm. long, 0,7 mm. broad at base and 0,23 mm. at the tip, appearing anteriorly only 3-times as broad as at the tip, so that we may conclude that the telson tapers the more strong-ly the older the animal is; in this youngest specimen the dorso-lateral spinules are also only perceptible under the microscope, the anterior pair is situated nearly at the anterior third, the posterior at three-fifths the length of the telson from the base, namely at 1,7 mm. Concerning the types of Nika japonica Dr. Tesch wrote me that in the two larger dry specimens no spinules were perceptible, at best one observes with a magnifying glass one or two pairs of minute tubercles; in the specimen, preserved in spirit, two pairs of small spinules became visible when magnified 10-times and looked at laterally. Accordinp- to Dr. Doflein the telson of the female should, like in Proc. canaliculata Leach, be furrowed and armed with two pairs of fine spinules, so that at least in the female small spinules, visible for the naked eye, seem sometimes to occur. In the specimen from Stat. 164 the eyes reach to midway between the orbital margin and the distal extremity of ist antennular article. Antennular peduncle in this specimen 5 mm. long, a little more than half as long as the carapace, rostrum included, and slender, 1 2-times as long as thick; the 2nd and the 3rd joint, together 1,8 mm. long, are together a little more than half as long as the distance between the orbital margin and the distal extremity of ist article, the 2nd joint is 3-times as long as thick and one and a half as long as the 3rd; stylocerite reaching to the distal third of basal article, with rounded tip. The slender antennal peduncle, of which the 2nd joint is unarmed, extends almost to the distal extremity of 2nd antennular article. The specimen from Stat. 313 agrees. with the described, but the antennal peduncle extends to the distal extremity of the 2nd joint of the antennular peduncle. Scaphocerite in this specimen just half as long as the carapace, rostrum included (in the specimen from Stat. 164 both scaphocerites are wanting); terminal spine reaching as far as the oblique tip of the lamella. SIi:OGA- EXPEDITIE XXXIX O.3. 27 2 IO In the young specimen from Stat. 71, finally, the 2nd joint of the antennular peduncle is only iwice as long as thick and just as long as the 3rd: this difference from the two other specimens may be caused by its young age or it may be a variation also known in /'roe. canaliculata (S. Kemp, 1. c). In the specimen from Stat. 164 that has lost the scaphocerites, the external maxillipeds extend by the ultimate and half the penultimate joint beyond the distal extremity of the anten- nular peduncle; in the female from Stat. 313 they reach by the terminal and two-fifths the penultimate joint beyond the scaphocerite, which is bit a trirle longer than the antennular peduncle. In the specimen from Stat. 164 the antepenultimate joint is 5,5 mm. long, the penul- timate 1,8 mm., the ultimate 2 mm., so that the two last joints measure together slightly more than two-thirds the antepenultimate joint, and the same proportion is shown by the young female from Stat. 313, in which the antepenultimate joint is 4,3 mm. long, the penultimate 1,56 mm. and the ultimate 1,4 mm., though here the terminal joint appears a little shorter than the penultimate. According to de Haan the two last joints should be together half as long as the antepenultimate, but Dr. Tesch informed me that in the dry type specimens the two last joints measure together a little more than five-eighths the antepenultimate and that they are larger than in de Haan's figure on Plate N of his work, so that he believes this figure to be not quite exact ; unfortunately in the type preserved in spirit the external maxil- lipeds are lost. In the specimen from Stat. 164 the right chelate peraeopod of the ist pair reaches to the middle of 3rd antennular article, while the left simple foot reaches by the dactylus beyond it. The carpus of the chelate leg has a stout shape, being only about one and a half as long as broad or thick distally, when looked at from above ; it is nearly as long as the fingers, but both carpus and fingers are a little shorter than the palm. The cylindrical carpus of the simple foot is as long as that of the chelate, but almost twice as long as thick; the propodus, nearly 4-times as long as broad proximally and narrowing distally, is almost twice as long as the carpus and the curved dactylus measures one-third of the propodus. The right leg of the 2nd pair is nearly 17 mm. long in the specimen from Stat. 164, more than half as long as the body, and reaches by the whole carpus and chela beyond the antennular peduncle; the merus is subdivided into 15, the carpus into 45 segments-, the chela is very small, one-third longer than the last segment of the carpus, but less broad and the dactylus is strongly curved; the left leg is wanting. In the specimen from Stat. 313 the right leg resembles that of the preceding specimen, but the number of the segments both of merus and carpus is a little larger; the much shorter and thicker left leg reaches by the chela and one-third the carpus beyond the antennal scale, the merus of this leg has 5 or 6 segments, of which the ist or proximal one is half as long as the joint and as long as the following combined, the carpus has 17 joints; chela larger than in the right leg, more than one and a half as long as the last joint of the carpus, fingers gaping, shorter than the palm, dactylus not so strongly curved as in the other leg. According to de Haan the left leg should not reach beyond the antennal scale, but Dr. Tesch wrote me that in the type specimen, preserved in spirit, it extends beyond the antennal scale as far as the scale is 2 I I lono- and that also in one of the dry specimens (in the other both legs are lost) the left leg reaches beyond it. In the specimen from Stat. 164 and in that from Stat. 313 the peraeopods of the 3rd pair project by the dactylus, the propodus and one-third or fourth of the carpus beyond the external maxillipeds; the two following pairs are wanting. In the legs of the 3ld pair the carpus is a little longer than the merus, the propodus just half as long as the carpus and the dactylus measures one-third the propodus. In the young male from Stat. 7 1 the three posterior legs are present; as is shown by the measurements the 5th pair agrees in length with the 3rd, except the dactylus which is a little longer, while the 4"1 legs are longer than those of the 3rd and 5th pair. In the pleopod of the 2nd pair of the young male from Stat. 71 the exopodite is about one-fourth longer than the protopod. At the proximal third of the inner branch, which is but little shorter than the outer, two appendages are implanted : at the outer side a slender stylamblys that measures somewhat more than one-fifth the length of the endopodite and that bears a cluster of cincinnuli at the tip, and between the stylamblys and the branch an appendix mas- culina, that is a little more than twice as long as the stylamblys, the proportion being as 16:7; the appendix masculina is slender, 16-times as long as thick and carries 3 setae of unequal length at the tip. In the much larger female from Stat. 313 the stylamblys measures but one- sixth the length of the endopodite. Both branches are rather narrow. Table of Measurements in millimeters: Length of telson Width of telson at base Width of tip of telson Distance between the base of the telson and the anterior pair of spinules . Distance between the base of the telson and the posterior pair of spinules Length of the carpus of the chelate leg Width of this carpus anteriorly Length of the palm of this leg Length of the fingers of this leg Length of the carpus of the simple leg Width „ , „ „ „ „ „ , . Length óf the propodus „„ „ ,, Length of the dactylus „„ „ • „ Length of the merus of the third leg n 11 ir carpus „it » n „ „ propodus „ „ „ „ „ v dactylus „ „ „ „ Length of the merus of the fourth leg 1 v » carpus »» -1 n „ „ „ propodus „ „ „ „ v » dactylus „ „ „ „ Length of the merus of the fifth leg n n 11 CarpuS nu „ » ,, v propodus „ „ „ „ „ „ dactylus „ „ „ „ I 2 J 2,7 5>7 4>4 0,7 1,36 1 0,23 0,28 0,26 o,8 i,8 spinules 1-7 3-5 invisible 0,6 1,1 0,9 o,43 0,8 0,56 0,6 i>3 1 o,45 1,04 0,64 o,5 1,14 0,9 0,4 0,64 0,5 1 2 1,6 o,35 0,65 0,52 i.9 4.4 3-6 2,06 4>S 3>9 1,2 2,4 i.9 0,38 0,72 0,64 2,16 2,85 i.7 o,45 1.9 i.9 1.7 0,44 2 I General distribution: Japan (de Haan); Bay of Tokyo, Kadsiyama (Ortmann); Nagasaki (Balss). The locality, mentioned by Doflein, Iterup, Kurile Islands, is not quite certain, according to Dr. Baiss. Family Glyphocrangonidae. Of the remarkable and very natural family of Glyphocrangonidae hitherto only one or two species were known to inhabit the Indian Archipelago, namely Glyphocrangon regalis Bate and Glyph. granulosis Bate, both obtained by the "Challenger" and of which the former was taken off Banda Islands, the latter between New Guinea and the Admiralty Islands. The Siboga Expedition, however, has not only found again these two, but has moreover discovered seven other species, of which five proved to be new to science: owing to the great activity of our dutch expedition we are therefore at present acquainted with nine species of Glyphocrangonidae living in the Indian Archipelago, nearly as many as occur in the seas of British India, while the total number of known species has increased from twenty five to thirty. By far the greater part of the species are found in the Indopacific, including the west coast of America , for only seven are known from the Atlantic and of these one occurs moreover also in the Indopacific. Two species, Glyph. sculpta (S. I. Smith) and longirostris (S. I. Smith) are found off the east coast of the United States; according to the Reverend Stebbing both should also occur at Cape Point, South Africa, and a single specimen of Glyph. longirostris was captured by the s. s. Helga off the west coast of Ireland. Four species, Glyph. aculcata A. M.-Edw., neglecta Faxon, nobilis A. M.-Edw. and spinicauda A. M.-Edw, are recorded from the Caribbean Sea and the Gulf of Mexico, the first has moreover been captured by the "Challenger" off Pernambuco. The last form, observed in the Atlantic Ocean, is Glvph. rimapes Bate, that was taken by the same expedition between Buenos Ayres and Tristan da Cunha; the range of this species is, however, almost cosmopolitan, for it was obtained by the "Challenger" also near Juan Fernandez and near Yokohama. Besides Glyph. rimapes only one other species, Glyph. hastacauda Bate, is known from Japan and only three others from the Pacific: Glvph. acuminata Bate from near the Fiji Islands, granulosis Bate from between New Guinea and the Admiralty Islands and, finally, regalis Bate, which is recorded, besides from off Banda Islands and three other localities in the Indian Archipelago, also from north of the Kermadec Islands and from off Matuku, Fiji Islands. Five species are recorded from the west coast of Mexico, the Gulf of Panama and the Galapagos Islands, namely: Glyph. alata, lorieaia, sicariv., spinulosa and viearia, all described and figured by Walïer Faxon in his valuable work on the Stalk-eyed Crustacea, obtained by the U. S. Fish Commission Steamer "Albatross". Glyph. podager Bate is still only known by one single specimen, a female, which was taken by the "Challenger" near Marion Island in the southern Indian Ocean, halfway between the Cape of Good Hope and the Kerguelen Islands. The Indian Ocean, north of the Equator, is inhabited by no less than ten species, firstly Glyph. Investigatoris W.-Mas. with the variety andamanensis W.-Mas., that occur as well in the Arabian Sea as in the Bay of Bengal, but that are probably identical with Glyph. regalis Bate. The Arabian Sea is the habitat of still four other species, one of which, Glyph. cerea Alcock & Anderson, belongs to the subgenus Plastocrangon, in which the eyes are small and in life of an opaque yellow-ochre colour; the three others are Glyph. priononota W.-Mas., Smitkii W.-INIas., and unguiculata W.-Mas., of which the first should perhaps be regarded as a local variety of Glyph. granulosis Bate. Besides Glyph. Investigatoris six species were observed in the Bay of Bengal and the Andaman Sea, hrstly Glyph. caeca W.-Mas. and caecesce?is W.-Mas., that both belong to Plastocrangon and of which the former was also taken on the Saya de Malha Bank, furthermore Glyph. hastacauda Bate, Gilesii W.-Mas. and Smitkii W.-Mas. ; finally a form obtained by the "Investigator" off the Arakan Coast, which was referred by Mac Gilchrist with some doubt to Glyph. longirostris (S. I. Smith), but which is probably different. The nine species which are at present known to occur in the Indian Archipelago, are Glyph. regalis Bate, hastacauda Bate, granulosis Bate, furthermore the new species pugnax, assimilis, Siöogae and megalophtkalma, finally Glyph. caeca W.-Mas. and Faxoni de Man, that both belong- to the subgenus Plastocranzon. It results from the preceding that nearly two-thirds of the total number of species of the genus Glyphocrangon, the only one of the family, are found in the tropical seas and that the geographical distribution of the greater part is rather small and limited. The only species, indeed, which are widely distributed, are Glyph. rimapes Bate, already mentioned, Glyph. hasta- cauda Bate that ranges from Japan through the Indian Archipelago to the Bay of Bengal, and the two species from the east coast of the United States, Glyph. longirostris and sculpta, that are also recorded from South Africa, while the former has even been observed off the west coast of Ireland, the most northern locality where a Glyphocrangon has been taken. Of the species of the subgenus Plastocrangon one, Glyph. caeca W.-Mas., is distributed from the Saya de Malha Bank to New Guinea. ■ Though all the species of Glyphocrangon are found in deep water, the depth at which they occur, varies, however, rather considerably according to the species, so that the reader is referred to the List of the known Species at p. 214. When this List is looked over, nearly one- third prove to have been captured at great depths surpassing 1000 fathoms and the maximum depth recorded appears to be that of Glyph. rimapes Bate, which was trawled near Yokohama at 1875 fathoms. We learn also that some species occur at moderate, other ones at great depths and that the depth generally not varies exceedingly much, when the species was found at different Stations. The smallest depths at which species were taken, proved to be 142 and 160 fathoms respectively for Glyph. Investigatoris and Glyph. Faxoni. The species of the subgenus Plastocrangon do not seem to live at constantly greater depths than those of the typical genus, for, though Glyph. caeccscens was taken at 1 748 fathoms, Glyph. caeca occurs in water of 300 fathoms on the Saya de Malha Bank and, as already mentioned, the new Glyph. Faxoni was found in the Bali Sea at 160 fathoms. 2 I 4 LIST OF ALL THE SPECIES OF GLYPHOCRANGON A. M.-Edw. KNOWN AT PRESENT. SPECIES HABITAT DEPTH IN FATHOMS aculeata A. M.-Edw. 1881 . . . St. Vincent (Antilies) Off Pernambuco Lat. 24°36'N., long. 84°5'W. Off Guadeloupe Off Dominica Off Martinique Off Grenada South of Jamaica acuminata Bate 1S8S Near the Fiji Islands alata Faxon 1893 Gulf of Panama Off Acapulco assimilis de Man 19 18 Bali Sea caeca (Plastocrangon) W.-Mas. 1891 Bay of Bengal near the Andamans Saya de Malha Between Ceram and New Guinea caecescens (Plastocrangon) W.- Mas. 1891 i Bay of Bengal cerea '(Plastocrangon) Alcock & Anderson 1S94 Arabian Sea, between the Laccadives and Maldives Faxoni (Plastocrangon) de Man Bali Sea Between the islands of Rotti and Timor Andaman Sea 1918 Gilesii W.-Mas. 1891 . granulosis Bate 1888 hastacauda Bate 1888 Investigatoris W.-Mas. 1891 . . Investigatoris var. andamanensis W.-Mas. 1891 longirostris (S. I. Smith) 18S2. longirostris Mac Gilchrist 1905 loricata Faxon 1895 Between New Guinea and Admiralty Islands Northern part of the Strait of Makassar Off Japan North of Sumbawa East of Kofiau-island Bay of Bengal, off Ceylon Bay of Bengal Arabian Sea Andaman Sea Off the east coast of the United States Off the South African Coast Off the west coast of Ireland Off the Arakan Coast Galapagos Islands 593 675 955 769, 878 542 502 y2 576 322 >) 1350 730 600 294 561 300 — 500 505 1748 719 160 284 370-419 405, 490, 500 1070 711 345 380, 434 436 594—225, 609 145—594 142—595 iss— 405 1043— 1073 660—800 900 1 100 33l> 421 1) In his paper "Supplementary Notes on the Crustacea" of Nov. 1896 Faxon indicates for the Station VIII of the "Blake" a depth of 610 fathoms, while in the List of the Stations of this expedition in: Buil. Mus. Comp. Zool. Vol. VI, N° 1, Sept. 1879, for the Station VIII the depth of 322 fathoms is mentioned. 2)5 SPECIES HABITAT DEPTH IN FATHOMS megalophthalma de Man 191S . Flores Sea 1 126 Strait of Makassar 1 109 South of Muna Island 1031 ^nobilis A. M.-Edw. 1881 .... Off Grenada Off Montserrat Lat. 23°42'N., long. 83°i3'W. 340, 291 303 860 Off Frederickstadt, Santa Cruz 45' Off Guadeloupe Off Dominica Off Martinique 734. 878 333- 391.824, 1 1 3 1 357 Off St. Lucia 422 Off St. Vincent 573 Near Marion Island '375 priononota W.-Mas. 1891 . . . . Arabian Sea in the neighbouihood of the Laccadives and northwards 865 — 1022 Between the islands of Rotti and Timor 284 regalis Bate 18S8 Off Matuku, Fiji Islands 3i5 North of the Kermadec Islands 600 Off Banda Island 200 Off Makassar 246 Strait of Makassar 396 Paternoster-islands 285 rimapes Bate 1888 Near Juan Fernandez 1375 Near Yokohama 1875 Between Buenos Ayres and Tristan da C unha 1715 ^-sculpta (S. I. Smith) 18S2 ... Off the east coast of the United States 1098— 1395 Cape Point, South Africa 800 — 900 Bali Sea 556 Flores Sea 434 Gulf of Panama 1793 Smithii W.-Mas. 1891 Bay of Bengal near the Andamans 561 Andaman Sea 188—220 Arabian Sea, off the Maldives 459 ~^ spinicauda A. M.-Edw. 1881 . . Off St. Kitts 208, 25Ö Off Barbados 209, 218, 288 Off Mariato Point 695 Off Acapulco Near Las Tres Marias 660, 772 676, 680 Gulf of California 859 itiigiticulaia W.-Mas. 1891 ... Arabian Sea, in the neighbouihood of the Laccadives and northwards Off Cocos Island 740, 770, 824, 947 770, 97S, 1067 On course from Cocos Island to Malpelo Island 1132, 1201 Gulf of Panama 1270 Between Galera Point and Galapagos Islands 1322 Galapagos Islands 1 189 Between Galapagos Islands and Acapulco Off Acapulco Gulf of California 1360 772 995 2 IÓ Key to the Species of the genus Glyphocrangon A. M.-Edw., known at present1). öj Anterior moiety of the fourth or lateral crest of the carapace not cöntinuous with the branchiostegal spine. ^ó.. Anterior moiety of the fourth or lateral crest of the carapace produced and expanded at its anterior end into a single huge vertically-compressed spine, that extends far beyond the level of the orbital margin. cx Posterior moiety of the third carapacial crest produced anteriorly into a spine. dx Spine at the anterior extremity of the posterior moiety of the third carapacial crest large. Rostrum measurine: about two-thirds the length of the rest of the carapace in the middle line and about 4-times as long as broad aculcata A. M.-Edw. ^ (A. Milne-Edwards, in: Annal. Scienc. Natur., Zoölogie, 1881, Art. N° 4, p. 5 and Recueil de Figures de Crustacés nouveaux ou peu connus, Avril 1883, Plate 38,) d, Spine at the anterior extremity of the posterior moiety of the third carapacial crest small. Rostrum measurino- more than four-fifths the length of the rest of the carapace in the middle line and 6-times as long as broad Smithii W.-Mas. (A. ALCOCK, A descript. Catai. Indian Deep-Sea Crust., Calcutta 1901, p. 129.) cz Posterior moiety of the third carapacial crest not produced ante- riorly into a spine. dx Anterior moiety of the fourth carapacial crest toothed along its posterior half. Behind the anterior pair of rostral spines the rostrum is armed on each side with 3 to 5 smaller marginal spines. Carapace and abdomen densely tuberculated alata Faxon (W. FAXON, The Stalk-eyed Crustacea ("Albatross"). Cambridge 1895, p. 137, Plate XXXVII.) d% Anterior moiety of the fourth carapacial crest entire behind the terminal spine. ex Rostrum with three pairs of lateral spines. Hepatic spine long, slender, trending strongly ontward. Cara- pace and abdomen sparsely tuberculated loricata Faxon (W. Faxon, 1. c. p. 140, Plate XXXVIII tó.) e„ Rostrum with two pairs of lateral spines. 1) This key, hut especially that of the species of the subgenus Plastoerangon^ is partly taken from J. Wuod-Mason's paper, in: Annals Mag. Nat. Hist., Febr. 1891 and from A. Alcock's work "A descriptive Catalogue Indian Deep-Sea Crustacea, Calcutta 1901. 217 Hepatic spine neither very long, nor slender and not trending strongly outward. Carapace and abdomen denselytuberculated regalis Bate Investigatoris W.-Mas. (A. Alcock, l.c. p. 127). Investigatoris var. andamanensis\\ '.-Mas. ■^ós Anterior moiety of the fourth or lateral crest of the carapace undivided and terminating anteriorly in a single small spine. £l Anterior moiety of the 3rd carapacial crest present and ending in the orbital spine. dx Posterior moieties of the 3rd and 4th carapacial crests running parallel with the upper border of the carapace. Abdominal carinae distinct, also on the anterior terga. 50 SPECIES HABl r.vr DEPTH IN FATHOMS cassiope de Man 1906 Inland Sea of Japan Deep water From Bering Sea to San Diego, Cal., including Puget Sound and Strait of Fuca 20 — 309 Off the south-eastern coast of Kamchatka 96 — 100 Inland Sea of Japan Deep water North East Atlantic fcom the White Sea and East North Sea 0 — 20 Finmark to the Mediterranean and Adriatic Christiania Fjord 30 Baltic, Pomerania and Rügen Brevik Fjord 50-65 Iceland crangon (Linné) var. Kemp 19 16 Akyab, Arakan coast crangon (Linné) var. Schidlowskii Ostroumoff 1895 Northern japanese sea Dalli Rathb. 1902 , . . Bering Sea and Aleutian Islands to Sitka Kamchatka, Okhotsk Sea and Kurile Islands 4' 2-61 Franciscorum Stimps. 1S56 . . . Off the west coast of North America, from south- eastern Alaska to San Diego, Cal. 3—29 Franciscorum angustimana Rathb. Off the west coast of North America, from British Columbia to Oregon 1 1 — 67 Hakodatei Rathb. 1902 Hakodate; Hokkaido Holmest Rathb. 1902 Off Wilmington, California 27 Catalina Harbor, California 30—40 Northwest of Cerros Island, Lower California 58 Lockingtonii Holmes 1904 .... Magdalena Bay, Lower California Black Sea: off Odessa, Sebastopol, Suchum munitella Walker 1898 Puget Sound Pacific Grove, California Catalina Harbor, California 30—40 West coast of the United States from off Comox, British Columbia, to San Geronimo Island, Lower California 3 — 31 nigromaculata Lock. 1876 .... From Northern to Lower California 3—33 orientalis Czern. 1884 Bay of Sebastopol Sachalin propinquus Stimps. 1860 Off the northern coasts of Japan Aomori, Rikuoku ( Japan) 4 — 20 From Monterey Bay, Cal. to San Domingo Point, Lower California 44 — 266 sagamiensis Balss 191 3 Sagami Bay From the Arctic coast of Alaska at Eschscholtz Bay southward along the eastern coast of Bering Sea * to the Shumagins 3-8 Along the east coast of North America, from East Florida northward spinirostris Rathb. 1902 Bering Sea and off the Aleutian Islands 276 — 623 Off Oregon and California 51—96 stylirostris Holmes 1900 Santa Cruz, Cal. Trinidad, Humboldt Co., Cal. Chirikof Island, Alaska 9—14 211 SPECIES H. \ UITAT DEPTII IN IA! variabilis Rathb. 1902 Bering Sea, Alaska Peninsula and Aleutian Islands C'alifornia Subgenus Notocrangon Cout. 1900. antarcticus Pfefter 1887 South Georgia from about 300 W. to about QO° W. antarcticus Pfefter var. gracilis Borr. 1916 Antarctic Ocean from about 8o°E. eastwards to nearly i6o°\V. 50-695 II. alata Rathb. 1902 angusticauda (de Haan) 1849 • ■ angusticauda (de Haan) var. den- tata Balss 1914 Genus Sclerocrangon G. O. Sars 1882. From Bering Sea to Puget Sound Japan: Simoda, Hakodate, Kadsiyama, Misaki, Na- -91 atrox Faxon 1893. Bellmarleyi Stebb. 1914 ^ boreas (Phipps) 1774 ') . ^ ferox (G. O. Sars) 1877. intermedia (Stimps.) 1860 gasaki Negishi Harbour near Yokohama Dzushi, Japan Off Acapulco Near Las Tres Marias Cape Natal N. by E. 24 miles (Natal) From the Lofotes and Finmark eastward in the Mur- man Sea, the White Sea, to the south-west coast of Nova Zembla Barents Sea. Franz Joseph Land. Spitzbergen. Iceland. Grinnell Land. Baffins Bay. Davis Straits. Labrador and southward along the east coast of America to Cape Cod. West Greenland East Greenland Midway on the north coast of Alaska Bering Straits Along the western side of Alaska, at the Aleutians and north-eastern Siberia North east Greenland West Greenland: Umanak-fjörcl N. E. of the Shetlands Off the west coast of Norway Jan Mayen Spitzbergen Murman Sea, Barents Sea Kara Sea Yokohama Okhotsk Sea Bering Sea near Cape Chepoonski Off the coast of Kamchatka Bering Sea and Aleutian Islands /"> 660 676 440 Along the east coast of America 5 — 36 N. Greenland 5-40 Barents Sea 62, 140 3—1 10 o — 50 68—125 122, 260 356 417 95 50-532 Off Vancouver Island 49—91 40 39—100 21 — 91 24 1) As has rightly been remarked by H. J. IIansen (The Danish Ingolf-Expedition. Vol. III. 2. Crust. Malac. I. Copenhagen 190S, p. 48), it cannot yet be established whether this species is circumpolar and whether it occurs or not along the 120 degrees of longitude north of Asia. SPECI1 - HABITAT DEPTII IN FATHOMS S intermedia (Stimps.) var. bidentata Balss 1914 Jacqueti (A. M.-Edw.) 1SS1 . . . munita (Dana) 1852. procax Faxon 1893. salebrosa (O wen) 1839 Sharpi Ortm. 1895 . . abyssi S. I. Smith 1884 . . angustirostris de Man 191 8 aus tralis (Hutton) G. M. Thomson 1879 bidentatus (de Haan) 1849 .... bispinosus Hailstone and West- Sagami Bay, Japan East Atlantic Near North Rona Off the west coast of Ireland East coast of the United States betvveen Charleston and Cape Cod Off the west coast of the United States from Port Etches, Alaska, to San Miguel Island, California Off Malpelo Island Off Acapulco Gulf of California Okhotsk Sea Off the coast of Kamchatka Bering Sea, Aleutian Islands and Alaska Peninsula III. Genus PontophÜUS Leach 1817. East coast of the United States Bay of Bengal Reef of Batjulmati (Java) Bay of Badjo, west coast of Flores Coast of Obi Major Between Misool and New Guinea East coast of Aru-islands 516, 542 250—542,707—710 263—959 12—53 899 660 • 859, 905 o — 10 35—I50 1917 — 2221 1748, 1997 Up to 22 Plankton, at night '7 7 New Zealand : from Napier on the east coast of North Within the 20- Island to Stewart Island fathoms line Japan : Nagasaki wood 1S35. -* brevirostris S. I. Smith 1881. . candidus Kemp 19 16 carinicauda (Stimps.) 1860 . . . Cliallengei'i Ortm. 1893 Chiltoni Kemp 191 1 echinulatus (M. Sars) 1861 . . fasciatus (Risso) 18 16. N. E. Atlantic, from the Lofoten Islands, North of the Arctic Circle, to the Channel Azores East coast of the United States Port Blair, Andamans Hong Kong North West of the Cape Verde Islands Tristan da Cunha Near the Philippine Islands Near Torres Strait New Zealand, off Cape Turnagain New Zealand West and south coast of Norway North Sea Shetland Islands; Hebrides West coast of Scotland East and west coast of Ireland Northside of the Bay of Biscay Mediterranean, Adriatic Azores; Arcachon ; off Guernsey; Scilly Islands; Fal- 10 — 200 7—233 2721 1900 2150 1400 1 100 43—218 72 — 480 240, 246 20 — }o DJ SPECIES HABITAT I'l PTH IN FATHOMS mouth; Salcombe Bay, Devonshire; Norfolk; off the Northumberland coast ; Firth of Forth; Firth Off the Irish coast Flindersi Fulton and Grant 1902 ~^gracilis S. I. Smith 1882 Hendersoni Kemp 1915, incisies Kemp 19 16 . . . intermedius (Bate) 1863. . . japonicus Dofl. 1902 junceus Bate 1888 Kempii de Man 1918. . . . Loivisi Kemp 19 16 tnegalockeir (Stebbing) 191 5 modestus de Man 191 8 . . . modumanuaisis Rathb. 1906 ^x)neglectus (G..0. Sars) 1882. ~^iiorvegicus (M. Sars) 1861 obliquus Fulton and Grant 1902 occidentalis Faxon 1893 of Clyde; coasts of Ireland. Bergen (Norway) Western Port, Victoria East coast of the United States Off Table Mountain, S. Africa Andaman Sea and off the Andaman coast of the Bay of Bengal Hawaiian Islands Chilka Lake Puri, Orissa coast Andamans Port Blair, Andamans Reef of Batjulmati (Java) Madura-bay Anchorage off Lirung, Salibabu-island Banda Saleh-bay Gulf of St. Vincent, Australia Sagami Bay, Japan Sulu Sea North of Sulu Island Between the Philippines and Borneo Betvveen the islands of Saleyer and Tanah Djampeah Port Blair, Andamans Near East London West of Kei-islands Hawaiian Islands Pulu Kaniungan Ketjil South-east of Rotti island South and west coast of Norway Shetlands; LochTarbert; Firth of Clyde; Firth of Forth Off the south coast of Co. Wexford South coast of Iceland North side of the Bay of Biscay East Finmark. Spitzbergen. Iceland West coast of Norway South coast of Norway Skagerrak Off the west and south-west coasts of Ireland Bay of Biscay Greenland. Davis Straits Off the east coast of the United States from Nova Scotia to Long Island Western Port, Victoria Gulf of Panama Off Galera Point Between Galapagos Islands and Acapulco not more than 1 5 4 225, 458 250 265, 561, 583 286 — 1059 4-4 Va 20 2 — 12 30—50 20 5 — 20 Up to 285 150 250 164 — 218 3—12 25> 37 166 293 to 800 6 284 2—6 8—10 40 20—45 75 500 220 To 30- 320 199—775 105 — 524 5 978—1793 1573 1360, 1879, 2232 1) This species is regarded by S. KEMP 1910 as a vaviety of Pont. bispinosiis Hailstone and Westwood. :54 SPECIES HABITAT DEPTH IN l'ATHOMS occidentalis Faxon var. indica de Man 191S Flores Sea 434 Northern part of the Strait of Makassar 711 Ceram Sea 456 East of Saleyer Island 633 South of Rotti island 501 • Bali Sea 294 parvirostris Kemp 19 16 Kilakarai, Ramnad distr.. S. India ') Pattersonii (Kinahan) 1859. . . Belfast. Shetlands Kilakarai, Ramnad distr., S. India plebs Kemp 19 16 Port Blair, Andamans 2 Off Sydney 2600 Port Blair,' Andamans 6 sculptus (Bell) 1S53 Moray Firth ; the Minch Firth of Clyde 5 — 20 Coasts of Ireland 4V.-S2 Coasts of Devon and Cornwall Guernsey. Concarneau Adriatic West and south coasts of Norway from Christianssund southward 30 — 60 Eastern Kattegat 22—55 Shetland Isles; Hebrides South of Iceland i>4— '73 Off the scotch and english coasts 20 — 60 Off the east coast of Ireland 10—73 Off the west coast of Ireland 244 Channel Islands Bay of Gascony 45. 220 Gulf of Marseilles 38-43 Adriatic 56—653 Western Mediterranean 218 — 850 Eastern Mediterranean trispinosus Hailstone 1835 .... Shetlands North Sea 10—22 East and west coast of Scotland The Channel (Hastings, Weymouth) East and west coast of Ireland 47.- 17 Concarneau Cap Breton, Bay of Gascony 28 Azores Gulf of Marseilles 3—4 victoriensis Fulton and Grant 1902 Port Phillip, Victoria 5 IV. Genus Aegeon (Risso) Guér. Ménev. (1816) 1S35. andamanensis (W.-Mas.) 1891 . . Andaman Sea [173, 185, 188—220 bengalensis (W.-Mas.) 1891 .... Bay of Bengal 145—250,240 -276 272 1) This species has nol been mentioned by Stanley Kemp in his vvork : "The 1 lecapoda Natantia of the coasts of Ireland. 1910" SPECIES HABITAT DEPTH IN FATHOMS cataphracta (Olivi) 1792 Mediterranean, Adriatic Goree Island, Senegambia Near East London, S. Africa 26 mi. W. S. W. of Honawar, N. Kanara district, Bombay Pres. Karachi Ceylon Pearl Banks 7 miles East of North Cape, New Zealand Habereri (Doflein) 1902 Sagami Bay, Japan Dzushi, Japan Between Ito and Hatsushima, Japan Hawaiian Islands Lacazei (Gourret) 1887 Gulf of Marseilles Bay of Biscay Southwest of Ireland orientalis Hend. 1893 Persian Gulf Gulf of Martaban Port Blair, Andamans pennata (Bate) 1888 Lobetobi Strait Saleh Bay, Sumbawa Arafura Sea Near Enoshima, Japan Dzushi, Japan Sagami Bay, Japan pennata (Bate) var. affinis Alcock 1901 Red Sea Persian Gulf Off Bombay Arabian Sea Off the coast of Burma, Bengal and Madras propensalata (Bate) 1888 Off the Kei-islands Botany Bay, near Sydney Andaman Sea propensalata (Bate) var. hilarula de Man 1918 Bay of Bima Rathbuni de Man 19 18 Hawaiian Islands Pulu Kaniungan Ketjil rugulosa Borr. 19 15 Haddumati Atoll, Maldives Sibogae de Man rgiS Bali Sea Sibogae de Man var. intermedia de Man 1918 Strait between the islands of Rotti and Timor V. Genus Argis Kröyer 1842. alaskensis (Kingsley) 1882 .... From Bering Sea, near the Pribilof Islands, to Oregon, including Puget Sound californiensis (Rathb.) 1902 . . . Off Santa Catalina Island, Cal. I Off Santa Cruz Island, Cal. crassa (Rathb.) 1899 j Bering Sea and Aleutian Islands Aleutian Islands to Sitka 110 — 165, 20- 40 28 -30 70 82 7' 82 127—138 38—44 240 — 246 160-374 48—49 135 150 49 44 27—55 82 116—493 35. 40 56-5S 35 12—93 140 50 55, 60 30 2S6— 800 6 55 118 24 — 1 2 1 59' 8° 155 ii'.,— 55 5-28 '56 SPECIl S HABITAT DEPTH IN FATHOMS \ dentata (Rathb.) 1902, lar (Owen) 1 839 . levior (Rathb.) 1902. ovifer (Rathb.) 1902 Alaska Bering Island From Bering Sea southward to Aleutian Islands and Alaska Peninsula Aleutian Islands eastward to Sitka Harbor Southeast coast of Kamchatka Plover Bay, Siberia Atlantic coast of North America from Greenland to Nova Scotia Arctic coast of Alaska (Cape Smith) and Siberia southward to Sitka and Kurile Islands East, southern and west coast of Greenland Okhotsk Sea, southward to Robben Island (off Cape Patience) and Iturup Island Aleutian Islands Semidy Islands Western side of Middleton Island Puget Sound Off Cape Beale, Vancouver Island Bering Sea, from 57° 39 ' N. to Aleutian Islands and Alaska Peninsula as far as Kadiak 21—93 6—80 96 10—25 6—96 Beach to 47 Down to 120 20 — 42 12—28 10 — 12 40 34 \ hystrix (A. M.-Edw.) 1881. indica de Man 191 8. . . Sarsii S. I. Smith 1879 septerncarinata (Sabine) 1824. VI. Genus Sabinea Owen 1835. Off Guadeloupe 734 Off the east coast of the United States 353 — 888 Davis Straits 393, 420 South- west of Iceland 19 12 North of Tanah Djampeah Island From 218 Shetland Islands Skager Rak, north of the Skaw 70 Off the south coast of Norway 60 — 80 Off the west coast of Norway East Finmark ; western part of the coasts of the Murman Sea as far as the entrance to the White Sea 40 — 178 South of Halifax Gulf of Maine 60—183 Davis Straits 67 — 140 All round Iceland 50 — 330 Near the Faeroes 255, 3S8 Siberian Polar Sea from I70°I7'E. westward to the Kara Sea 9 — 33 Kara Sea 10 — 100 Spitzbergen 5 — 133 Barents Sea Murman Sea, White Sea 16 — 46 Eastern and western coasts of Finmark Lofotes and further south on the west coast of Norway East coast of North America from Massachusetts Bay to the St. Lawrence estuary 15 — 70 25; SPECIES HABITAT DEPTH IN FATHOMS gibbosa Baker 1904 West coast of Greenland as far up as Discovery Bay at Grinnell Land Melville Bay South and East Greenland Near Jan Mayen Along the east, north and northwest coast of Iceland VII. Genus Vercoia Baker 1904. South Australia Perrieri Nobili 1904 VIII. Genus Coralliocrangon Nobili 1904. . Djibouti Oi crangonoides Kingsley 1S97 ^ Dofieini Balss 191 3 ommatosteres W.-Mas. 1891 pectinata Faxon 1896. . . . areolata Faxon 1S93 . . . . echinata Dana 1S52 IX. Genus Naushonia Kingsley 1897. Island of Naushon, southern coast of Massachusetts X. Genus Prionocrangon W.-Mas. 1S91. Sagami Bay, Japan Bay of Bengal off the Ceylon coast Andaman Sea East of Saleyer Island Northern part of the Strait of Makassar Off Martinique XI. Genus Paracrangon Dana 1852. Near Las Tres Marias From Port Etches, Alaska, to Puget Sound North-east of Yedo Island Sagami Bay, Japan Wladiwostok Tartarian Gulf Southern Okhotsk Sea 5—45 100 o — 164 50 — 60 20 — 1 10 20 — 30 In the sand of the small channels - the so-called gutters - of the island. 191—328 200 — 350 405 711 565 676, 680 12—48 190—765 Pontophilus Leach. Among the genera of Crangonidae it is the genus Pontophilus Leach which nowadays is represented by the largest number of species: no less than 38 species and 1 variety, indeed, are at present known. Species of Pontophilus are recorded from various parts of the world : excepting Pont. norvegicus, however, this genus has not been observed in the Arctic Ocean, on the north coast of Russia, Asia, Alaska etc, nor are species known from the antarctic seas at a greater latitude than 500 S. Pont. spiiwsus and fasciatus have repeatedly been found in the Adriatic and the Mediterranean, Pont. sculptus has been recorded from the Adriatic, vvhile Pont. trispinosus has been taken off Marseilles, so that in these seas the genus is apparently represented by four species. Pont. norvegicus ranges from East Finmark, Spitzbergen and SIBOGA-EXPEDITIE XXXIX a1. ,, Iceland to the Bav of Biscay, but lias alsu been captured off Greenland, in Üavis Straits and off the cast coast of North America to Long Island. The north-eastern Atlantic, the coasts of Europe, are inhabited, besides by Pont. norvegicus, by eight species, Pont. bispinosus, eckinulatus, fasciatus, neglectus, Pattersonii, sculptus, spinosus and trispinosits : excepting Pont. norvegicus, Pattersonii and sculptus, these species occur all in the North Sea. Pont. Challengeri Ortni. is one of the most widely distributed forms, it was taken by the "Challenger" north west of the Cape Verde Islands, off Tristan da Cunha, near the Philippine Islands, near Torres Strait and off Cape Turnagain, New Zealand. Three species are known from the east coast of the United States, Pont. abyssi, brevirostris and gracilis, of which the first and the third have also been observed in the Bay of Bengal, Pont. gracilis, moreover, also off Table Mountain, South Africa and at the Hawaiian Islands. Still another species is known from South Africa, Pont. megalocheir , which is remarkable by the great size of the hand and finger of the first peraeopods and which was captured near East London, South Africa. No species of this genus are known from the West-Indies or from the east coast of South America, while Pont. occidentalis Faxon is the only representative on the west coast of America, occurring in the Gulf of Panama, off Galera Point and between the Galapagos Islands and Acapulco. The greater part of the species of this genus are found in the Indopacific. Besides Pont. abyssi and gracilis, eight are known from the Bay of Bengal, the Andaman Sea and the east coast of India, namely: Pont. candidus, Hendersoni, incisus, Lowisii, parvir osiris, pilosus, plebs and sabsechota: these species, with which Mr. Stanley Kemp has lately enriched science, are all of a small size, Pont. sabsechota, only 9,3 mm. long, being one of the smallest Macrura known. Thanks to the investigations of the "Siboga" we are at present acquainted with nine species found in the Indian Archipelago. Besides Pont. Challengeri they are Pont. angushrostris, incisus. japonicus, junceus, Kempii, modestus, modumanuensis and a new variety indica of Pont. occidentalis: Pont. angustir osiris, Kempii and modestus proved to be new to science. Of these species Pont. incisus occurs also at the Andamans, while Pont. modumanuensis was first recorded from the Hawaiian Islands, which, as already indicated, are also inhabited by Pont. gracilis\ Pont. japonicus was first made known from Japan, where still another species occurs, Pont. bidentatus. Pont. carinicauda, allied to Pont. japonicus, is only known from Hong Kong. Five interesting forms occur on the coast of New South Wales, Victoria and South Australia, viz. Pont. Flindersi, intermedius, obliquus, profundus and victoriensis : they are confined to these coasts and not found elsewhere. Pont. intermedius from the Gulf of St. Vincent bears some resemblance to Pont. Pattersonii from Belfast, a form which is as rare and as little known. The coasts of New Zealand, finally, are inhabited by three, firstly the already mentioned Pont. Challengeri and furthermore Pont. australis and Chiltoni, that are closely related. As regfards the vertical distribution the List of the species teaches that the greater number occur in shallow water or at moderate depths, while only five have been captured at a greater depth than 1000 fathoms. These five, Pont. abyssi, Challengeri, gracilis, occidentalis and profundus, are closely allied forms, as is proved by the key to the species and the first three belong to those that are very widely distributed. Nearly one-third of all the species have been taken at less than 100 fathoms and about one-fourth at less than 25, namely Pont. australis, 259 Flindersi, Hendersoni, incisus, Lowisii, obliquus, plebs, sabsechota and victoriensis. The depth at which the same species occurs, varies also often considerably, Pont. Challengeri, for instance, was trawled at i ioo, but also at 2150 fathoms, Pont. occidentalis at 978 and at 2232, Pont. echinulatus at 43 and 480. Key to the species of the genus Pontophilus Leach. iz, Outer margin of antennal scale not denticulated. --Mj First four abdominal somites dorsally smooth. J c, Three spines on mid-dorsal line of carapace. of] Carapace with four lateral spines, which, like the three of the mid-dorsal line, are not the acute endings of carinae. Rostrum with the lateral margins unarmeel and tapering to a narrow rounded apex pilosus Kemp (Stanley Kemp, Records Indian Museum, Calcutta, Vol. XII, Part VIII, 1916, p. 367, PI. VIII, fig. 4.) "^ d, Carapace with two lateral keels, the upper with two spines, the lower with one. ^ ex Rostrum long and narrow, projecting beyond the line of the spiniform outer angles of the orbits, terminating in an acute point and armed about in the middle with a pair of small lateral spinules norvegicus (M. Sars) (Stanley Kemp, The Decapoda Natantia of the Coasts of Ireland, Dublin 1910, p. 162, PI. XXI, figs. 9, a and b.) *ez Rostrum very short, tridentate, the median tooth scarcely broader and very little longer than the lateral, not projecting beyond the line of the spiniform outer angles of the orbits brevirostris S. I. Smith (S. I. Smith, Buil. Mus. Comp. Zoology, Cambridge, Vol. X, N" 1, 1882, p. 35, PI. VII, figs. i — i*.) d., Carapace with two lateral spines. cl Peraeopods of the first pair with the outer margin of the merus unarmed. Rostrum with two pairs of lateral teeth. /j Eyes small, the length of carapace, including the rostrum, being about ten times as long as their greatest diameter abyssi S. I. Smith (S. I. Smith, Annual Report Commiss. of Fish and Fisheries for 1882. Wash. 1884, p. 363 (19); idem for 1S85, Wash. 1886, PI. XI, figs. 3, ia.) f„ Eyes large, the length of carapace, including the rostrum, being 5,1 — 5,8-times as long as their greatest diameter. g1 Species 73 mm. long. Abdomen 21/3-times as long as carapace. Anterior gastric spine as large as posterior occidentalis Faxon (W. Faxon, in: Memoirs Museum Comp. Zoology, Cambridge, Vol. XVIII, 1895, p. 131, PI. D, fig. 2- 2d.) 2ÓO g , Species not exceeding 48 mm. ia length. Abdomen 3-times as long as carapace. Anterior gastric spine considerably smaller than posterior. . . . occidentalis Faxon var. iudica de Man (., Peraeopods of the first pair vvith the outer margin of the merus armed with a spine Challcngeri Ortm. ^ (Pontophilus gracilis C. Spence Bate, Report Challenger Macrura, 1888, p. 4S7, PI. 87 ; Pontophilus challcngeri A. Ortraann, Decapoden und Schizopoden der Plankton-Expedition, Bd. II. G. b., Kiel und Leipzig, 1893, p. 49.) ^di On either side of the mid-dorsal line a row of minute spines terminating in one principal tooth. One spine on each hepatic region. Rostrum short, rounded at apex, narrowed, concave above Pattersonii (Kinahan) (J. R. KlNAMAN, Proc. Royal Irish Acad. Vol. VIII, Part 1. Dublin 1862, p. 4, 8. PI. V.) ■^ c2 Mid-dorsal line of carapace with tvvo spines. d{ Carapace with six lateral spines. ex Mid-dorsal spines of carapace placed close together on the anterior third. Antennal scale a trifle more than twice as long as wide australis (Hutton) G. M. Thomson (G. M. THOMSON, On the New Zealand Phyllobranchiate Crustacea- Macrura. London 1903, p. 434, PI. 27, figs. 1 — 5.) e„ Mid-dorsal spines of carapace widely separate, posterior spine placed exactly on the middle of the carapace. Antennal scale considerably less than twice as long as wide Chiltoui Kemp (Stanley Kemp, Records Indian Museum, Vol. VI, Part i,Calcutta 191 1, p. s, PI. II, figs. 6—10.) d3 Carapace with three lateral spines : two are placed on the first or upper one of the three lateral keels, the third spine on the lower, while the second or middle keel is unarmed. Rostrum truncate bidentattis (de Haan) (W. de Haan, Fauna Japonica. Crustacea, 1849, p. 183, PI. XLV, fig. 14.) ^d% Carapace with two lateral spines. Rostrum acute, slender. ex Rostrum without lateral teeth junccus Bate (C. Spence Bate, 1. c, p. 491, PI. 88, figs. 2— 4.) w., Rostrum with one lateral tooth on each side. Spines of the lateral faces of carapace in an oblique plane . . gracilis S. I. Smith (S. I. Smith, 1. c, 1882, p. 36, PI. VII, figs. 2 — ia.) e% Rostrum with two lateral teeth on each side. Spines of the lateral faces of carapace in the same level . . . profundzis Bate (C. Spence Bate, 1. c, 18S8, p. 490, PI. 88, fig. 1.) dl Carapace with one spine on each side. 2ÓI el Carapace subquadrate, as broad as long. Rostrum broad, flattened, obscurely trifid at the apex. Lateral spine of carapace turned obliquely inward . . obliquus Fulton and Grant (S. W. FULTON and F. E. GRANT, Proc. Roy. Soc. Victoria, Vol. XV (New Series), Pt. I, 1902, p. 63, PI. X, lig. 1.) e„ Carapace much longer than broad. Rostrum acute, armed on the basal half with two spines on each side. Lateral spine of carapace directed straightly forwards modumanuensis Rathb. -\ts Carapace without lateral spines. On either side of the carapace are numerous minute tubercles arranged in more or less distinct longitudinal series . bispinosus Hailstone and Westwood (Stanley Kemp, 1. c, 1910, p. 152, PI. XXI, figs. 4, a and b.) -^£3 Mid-dorsal line of carapace with one spine '). dx Carapace with four lateral spines, one a little behind the level of the mid-dorsal spine and three, behind one another, just posterior to the antero-lateral spine. A curved ridge behind the eyes is cut into four small fine teeth Flindersi Fulton and Grant (S. W. Fulton and F. E. Grant, 1. c, p. 6;, PI. X, fig. 3.) d„ Carapace with three lateral spines. ex Of the three lateral spines the two lower ones are placed close together, the posterior much farther distant from the third or hepatic spine as from the anterior. Laminar portion of antennal scale exceeding far the terminal spine plebs Kemp (Stanley Kemp, I. c, 1916, p. 370, PI. VIII, fig. 5.) e2 Of the three lateral spines the two lower are not placed close together, the posterior being as far distant from the hepatic spine as from the anterior. Laminar portion of antennal scale not or hardly exceeding the terminal spine modestiis de Man ds Carapace with two lateral spines. l\ Between the two lateral spines and the mid-dorsal line is a row of minute denticles extending from the orbital spine backward to just beyond the middle of carapace iutcrmcdius (Bate) (C. Spence Bate, Proc. Zool. Society, London, 1863, p. 6, PI. XLI, fig. 6.) e„ No row of minute denticles between the mid-clorsal line and the lateral spines of the carapace. /j Terminal spine of antennal scale not reaching nearly as far forward as the distal end of the lamella. Sixth abdominal somite about twice as long as thick . . caudidus Kemp d (Stanley Kemp, 1. c, 1916, p. 365, textfigure 3.) 1) In Font. neglccltis sometimes behind this spine an obscure tubercle is obsevved in the mid-dorsal line. 26: fs Terminal spine of antennal scale reaching nearly as far forward as the distal end of the lamella. Sixth abdo- minal somite almost four times as long as thick . t Carapace with one spine on each side (Stanley Kemp, 1. c, 1910, p. 146, PI. XXI, figs. 2, a and b.) ^ di Carapace without lateral spines. (', Carapace longer than broad. /j On either side of the mid-dorsal line of the carapace are two lobe-like folds, that anteriorly are well-defined and rounded. Rostrum very broad, abruptly truncate at apex (Stanley Kemp, 1. c, 1910, p. 151, PI. XXI, figs. 3,« and b.) /„ Carapace without lobe-like folds on either side of the middle line. Rostrum rather narrow with rounded apex (Stanley Kemp, 1. c, 1910, p. 153, PI. XXI, figs. 5, a and b.) e2 Carapace broader than long. Immobile finger of subchela formed of two teeth, closely juxtaposed and not articulated. fx Telson furnished at the apex with a long and slender tooth, flanked by a pair of plumose setae .... (Th. R. R. STEBBING, Annals South African Museum, XV, London, 191 5, p. 71, PI. LXXIX.) ƒ-, The apex of the telson consists of a triangular plate with a minute spinule on either side and with two pairs of plumose setae arising from beneath it (Stanley Kemp, Memoirs Indian Mus., V, 1915, p. 261, PI. XIII, fig. 8.) ^£4 Mid-dorsal line of carapace without spines. dx Rostrum well-developed, as long as the eyes, apex broad, squarely truncate d„ Rostrum exceedingly small, consisting merely of a small flat, triangular, acute prolongation of the median part of the carapace, so that the eyes are contiguous (Stanley Kemp, 1. c, 1916, p. 372, PI. VIII, fig. 6.) ^ ó„ Abdomen with at least the third and following somites carinated. cl Carapace with no spine in the mid-dorsal line. Three lateral keels, of which the first and the third arë unispinose (W. STIMPSON, Proc. Acad. Xat. Sciences Philadelphia, 1S60, p. 25.) ci Mid-dorsal line of carapace with one spine. Three lateral keels, the first without a spine, but abruptly notched near its middle point, the second with a spine and a notch, third unarmed Si \xi,];v Kemp, 1. c, 1911, p. 6, PI. II, figs. 11 — 14.) 1 Mid-dorsal line of carapace with three spines. modestus de Man trispinosits Hailstone ^ fasciatus (Risso) ucglcctits (G. O. Sars) ■^-- mcgalccheir (Stebbing) Hcndcrsoni Kemp candidus Kemp Q parvirostris Kemp carinicauda (Stimps. sabsechota Kemp 263 -Vj Lateral faces of carapace with five spines, placed on two carinae, the upper hearing three spines, the lower two. spinosus (Leach) (Stanley Kemp, 1.c, 1910, p. 160, PI. XXI, figs. 8,a—d.) •^ds Lateral faces of carapace with more than five spines. ex First lateral keel of carapace reaching to near the postenor edo-e; between it and the mid-dorsal line another row of very small teeth echinulatus (M. Sars) (Stanley Kemp, 1. c, 1910, p. 144, PI. XXI, figs. j,a—J.) , First lateral keel reaching only about three-fourths the length of the carapace backward ; 110 small teeth between it and the mid-dorsal line victoriensis Fulton and Grant (S. W. Fulton and F. F. Grant, 1. c, p. 65, PI. X, fig. 2.) ^a, Outer margin of antennal scale denticulate. At least the third and following somites of the abdomen are carinated. bx Outer margin of antennal scale armed with a single spine in addition to the terminal spine. (\ Additional spine of outer margin of antennal scale placed near the base, at the end of the proximal quarter . . incisus Kemp cs Additional spine of outer margin of antennal scale placed at the end of the proximal third or near the middle. ^ 7 1 1,2 7 i-7 2,22 1,24 o,5 0,4 0,28 5,8 5,7 3,4 6,2 5,8 3,75 2,2 2 ',4 7 6,2 4 '.75 1,6 1 '7 I5Ó 10 7-2 6,5 4,2 1,6 i,5 o,95 7 6,5 4,i 0,6 0,6 0,4 1,6 1,52 1 0,28 0,24 o,iS 0,8 0,76 o,5 36,3 33.8 22,5 7 6,75 5 r,6 1,6 1,1 8,75 7,7 4,6 8,5 8,5 5 8,3 7-75 4,6 7>25 7 4,i 4 35,5 8,6 ',4 0,4 4,45 4,6 1,6 5,3 1,32 '2,5 5,5 1,25 5,i o,5 1,2 0,22 0,62 27 6 i,3 6,5 6,75 6,25 5,i5 N° 1 ova-bearing female from Stat. 45 ; N° 2 ova-bearing and N° 3 young female from Stat. 316; X" 4 male from Stat. 300. Table B. Length of carapace, rostrum included Length of rostrum Breadth of rostrum Greatest diameter of eye 1'roportion between the length of cara- pace and the greatest diameter of eye 1'roportion between length and breadth of rostrum 11,6 1,7 o,5 2 5,8 3,4 11,6 ',7 0,6 2 5,8 2,8 3 4 5 6 7 8 9 IO II 12 13 7,5 10,5 7,4 6,5 8,3 S,6 n,5 11,2 i°,3 10 7,4 i,5 i,5 1,1 V i,i5 1,4 2 2,22 2,1 2,12 1,44 o-34 0,6 0,48 0,4 0,52 0,4 o,44 0,4 o,35 o,3S o,34 i,36 1,8 1,5 1,16 1,25 1,6 2 2 2 1,75 1,4 5,5 5,8 5 5,6 6,6 5,4 5,7 5,6 5,1 5,7 5,3 4,4 2,5 2,3 2,7 2,2 3,5 4-5 5,6 6 5,6 4,2 14 7 1,24 0,28 1,4 5 4,4 1) The rostrum, being directed more or less obliquely upward, is measured in a horizontal position, when the carapace has been placed obliquely. 2) The breadth of the rostrum is the distance between the apices of the posterior pair of teeth. 3) The length is taken from the base to the tip, in the middle line, without the terminal spines. 4) The two uropods are measured from the articulation with the 6'h somite, the basal joint being included. irtion between the lenglh of the rostrum and that of tlie rest of the carapace Number of pairs of rostral teeth . . . 5,8 2 Rostral teeth ' large 5,8 2 6 ! 2 5,7 5 2 2 6,2 5,1 2 2 large ' small i slightly j Anterior gastric spine 'mier.') larger mier. than N"i 1 large lavge l/3 -; mier. large large laree 4,7 2 small 4 4 3,7 4,1 4,6 2 2 3,i 2 small small small small j moderate ' size mier. mier. mier. mier. mier. N° i — 3 Stat. 45; X" 4 and 5 Stat. 88; N° 6 Stat. 178; Xu 7 Stat. 211 ; N° 8 Stat. 300 ; N° 9 — 14 Stat. 316. 2. Pontophilus modumanuensis Rathb. PI. XXI and XXII, Fig. 64 — 64/. Pontophilus modumanuensis M. J. Rathbun, in: U.S. Fish Commission Buil. fo 1-1903, Part III, Wash. 1906, p. 910, textfigure 63. Stat. 89. June 21. Pulu Kaniungan Ketjil. 11 m. Bottom coral. 2 adult, ova-bearing females. Stat. 297. January 27, 1900. io°39'S., i23°4o'E. South-east of Rotti island. 520 m. Bottom soft, grey mud vvith brown upper layer. 1 adult, ova-bearing female. The present specimens are referred with some doubt to this species. According to the description the antennal peduncle should reach to the middle of the second antennular article, in our specimens, however, the slender peduncle reaches considerably beyond the anten- nular peduncle, either to the distal fourth of the antennal scale (the specimen from Stat. 297) or to the distal third, in the two others. The textfigure in Miss Rathbun's description is 110 doubt inaccurate and incomplete. The meclian carina, that stops short of the posterior margin of the carapace, is wanting in that figure. According to the description the slender rostrum is armed on its basal half with two spines on each side : in the figure the margins of the rostrum are smooth, unarmed, while the two spines that are situated more backward behind the eyes, represent no doubt the acute angle of the notch on the orbital margin between rostrum and orbital spine and the microscopical spinule that one observes a little behind that notch, though, in this case, these spinules appear in the figure much too large. Distinct lateral carinae, as are visible in the figure, are in the adult specimens not developed; furthermore the carapace itself and the antennal scale appear in the figure less broad in proportion to their length than in the specimens collected by the "Siboga", but the two last named differences may probably be attributed to the young age of the Hawaiian type. Though the three Siboga specimens are all ova-bearing, the female from Stat. 297 bas a smaller size than the two from Stat. 89, but it is still more remarkable that this smaller specimen accords better with Miss Rathbun's description than the two females from Pulu Kaniungan Ketjil. The female from Stat. 297 is 21 mm. long from tip of rostrum to tip oftelson, measured in the middle line, carapace 6 mm., abdomen 15 mm.; the carapace is almost half as broad (3,2 mm.) as long. The acute rostrum (Fig. 64, 64^) that reaches as far forward as the eyes, measures just 1) "Mier." signifies "microscopical", only perceptible by means of the microscope. 2) "'/V' signifies that it measures one-third the length of the posterior gastric spine. one-fifth the length of the rest of the carapace and is 5-times as long as broad in the middle; the lateral margins are armed with tvvo pairs of strong, forwardly directed spines, the anterior pair arising just from the middle of the rostrum, the posterior near its base. The rostrum rises from the carapace obliquely upward and from the posterior pair of spines runs almost horizontally forward; on the sides of the rostrum feathered setae are implanted, while a few hairs exist on the upper surface. Of the two median spines (Fig. 64a) on the gastric region the posterior stands at the anterior fifth of the carapace, the anterior twice as far from the posterior as from the level of the orbital margin; looked at from above the posterior spine appears 3-times as long as the anterior. Between the two spines the carapace is sharply carinated and from the posterior spine a prominent, though rather obtuse crest runs backward, fading away at the posterior sixth of the carapace. Orbital spine reaching to the middle of the cornea, directed obliquely upward; midway between this spine and the rostrum the orbital margin is notched, the inner angle of the notch is rather acute, though not spiniform and from this notch a furrow runs backward and outward, which soon passes into a fine suture that is directed straight backward, though reaching probably not so far as the median crest. A little behind and outwards of the orbital notch a minute spine occurs on the upper border of the furrow, like in Pont. abyssi S. I. Smith, occidentalis Faxon and other forms. Branchiostegal spine long, reaching a little beyond the level of the anterior border of the eyes and directed outward and forward. The lateral spine, which is also not buttressed by a carina, appears as large as the posterior gastric spine and is placed at the same level as the latter. The abdomen, telson included, is 2y3-times as long as the carapace. The tergum of the 3rd somite is slightly prominent backward, so that the posterior margin, when looked at from above, appears triangular with obtuse tip, lor the rest the ist to 5* terga are smooth and rounded. Sixth somite 3 mm. long, almost twice as long as the 5th, upper surface grooved longitudinally, the groove very shallow. Telson 3,76 mm. long, one-fourth longer than 6lh somite, tapering backward anteriorly more strongly than posteriorly; the tip is 0,22 mm. broad, l/17 the length of the telson, but, on the level of the posterior pair of dorso -lateral spinules, the telson is hardly one and a half as broad as at the tip. The telson, which is faintly grooved about to the posterior third, bears two pairs of dorso-lateral spinules, the anterior pair, that are 0,1 mm. long, are implanted immediately before the middle, the posterior pair, 0,12 mm. long, at the posterior third; the acute tip (Fig. 646) is flanked at either side by 3 spines, the inner pair are very long, 0,75 mm., one-fifth the length of the telson, and feathered, the following pair are glabrous, project only by half their length beyond the tip and measure little more than one-third the length of the submedian pair; the outer pair, finally, 0,1 mm. long, at the posterior extremity of the lateral margins, measure one-third the length of the intermediate pair. The narrow inner uropods reach, beyond the tip of the telson, to the middle of the submedian pair of terminal spines, the outer uropods are distinctly shorter, reaching to the posterior extremity of the lateral margins of the telson, their apex is rounded and without diaeresis. The eyes, which are large, their greatest diameter being in proportion to the length of the carapace, rostrum included, like 1 : 7,5, are of a pale sooty colour, the inner margin more blackish. The antennular peduncle and the pointed stylocerite agree with the original description, 2nd joint of peduncle about one and a half as long as broad. Spine at the antëro-external angle of 2nd antennal article a little shorter than the stylo- cerite; antennal scale (Fig. 6^.d) 2,9 mm. long and 0,94 mm. broad in the middle, about half as long as the carapace and 3,1-times as long as broad in the middle; outer margin slightly concave, the terminal spine, that almost reaches to the rounded apex of the lamella, though not exceeding it, is 0,34 mm. long, between '/« and '/,, the length of the lamella, and 0,15 mm. broad at base. According to the original description the antennal peduncle should reach to the middle of the second antennular segment, in the female from Stat. 297, however, the peduncle, which is 6-times as long as thick, reaches, far beyond the antennular peduncle, to the dis tal fourth of the scale. The external maxillipeds project by half their terminal joint beyond the antennal scale and their penultimate joint reaches as far forward as the antennal peduncle. The anterior peraeopods are wanting. Second peraeopods {Fig. 64 e) very short; merus 1,08 mm. long, slender, 8-times as long as broad. carpus 0,5 mm. long, nearly half as long as the merus, with 7 or 8 long setae at the distal margin and 3-times as long as the distal margin is broad; palm 0,4111111. long, one-fifth shorter than the carpus, the margins parallel and 2,7-times as long as broad ; the slender tapering and gaping fingers are just as long as the carpus, the unguis of the immobile fineer is almost as long- as the rest of this fm^er, the two uneues of the dactylus are half as long; a tuft of setae, of which the longest are as long as the fingers, exists at the articulation of the dactylus, a few setae are also observed on the palm and on the fingers, while the inner margin of the dactylus is beset with 7, that of the immobile finger with 4 stift setae. The ischium appears nearly as long as the merus and both joints are provided with long feathered setae. The setaceous peraeopods of the 3"1 pair reach by the dactylus and half the propodus beyond the antennal scale, those of the 4th pair, which, like the 5"1, are much stouter, by half the dactylus, last pair about as long. Dactyli of 4th and 5th pair styliform, slightly curved and little shorter than their propodi. Of the ist pleopod of the female from Stat. 297 the outer branch is lanceolate, 2 mm. long and 4-times as long as broad; the endopodite is one-fourth shorter, much narrower, 8-times as long as broad and provided with very long feathered setae, very long hairs and setae occur also on the inner border of the protopod. Exopodite of 2nd pleopod (Fig. 64/) 1,8 mm. long, 3,5-times as long as broad, endopodite 5-times and nearly just as long as the outer branch; stylamblys 1 mm. long, 10-times as long as thick, with distinct cincinnuli on the tip, the outer margin with 12 long feathered setae and with 5 on the distal half of the inner margin. The three following pleopods resemble the second, but the inner branch and the stylamblys become gradually a little shorter, so that in the 5th pleopod the inner branch is one-sixth to one-seventh shorter than the exopodite and the stylamblys only 0,45 mm. long, namely about one-third the length of the endopodite, with only 5 or 6 feathered setae 011 its outer margin. Eggs very numerous, 0,6 mm. long. The female from Stat. 297 lias been described in detail, because, on account of its smaller size and other characters as e. g. the relative length of the anterior gastric spine and the form of the scaphocerite, it more approaches the Hawaiian type of Pont. modumanuensis than the two specimens from Stat. 89. The carapace of one of these females from Stat. 89 is 6,6 mm. long and 4,1 mm. broad, the abdomen about 18 mm. long, 2,7-times as long as the carapace. The rostrum (Fig. 64^), 0,84 mm. long, measures only '/: tne length of the rest of the carapace, being relatively shorter than in the female from Stat. 297; it reaches only to the middle of the corneae, distinctly shorter than the eyes, is, like in the specimen from Stat. 297, 5-times as long as broad in the middle and likewise armed with two pairs of spines. The posterior gastric spine stands at the anterior sixth of the carapace, the anterior but little farther distant from the posterior than from the orbital margin, but the anterior spine is much smaller than in the female from Stat. 297 and measures only one fifth of the posterior, so that it may easily be overlooked. For the rest the carapace resembles that of the female from Stat. 297, the supraorbital notch or fissure curves likewise ontward and backward and runs thereupon as a fine suture straight backward to the posterior third of the carapace ; nearly on the middle of the latter the surface is slightly thickened longitudinally just above the suture, but a longitudinal keel exists here, properly speaking, not nor posterior to the lateral spine. The surface of the carapace is finely pubescent and longer hairs are observed on the hepatic region in front of the lateral spine and just below it. From the posterior extremity of the described lateral suture a sinuated ridge or keel runs obliquely forward and downward and runs to the hepatic groove below the lateral spine. The abdomen agrees with that of the female from Stat. 297, but the 6th somite is rounded, presenting no shallow groove, and this groove is also wanting on the telson ; unfor- tunately in one of the specimens the tip is broken off, while in the other the terminal spinules are lost. The telson is pubescent and this has no doubt also been the case on the rest of the abdomen. In the younger of the two females, of which the carapace is 6,6 mm. long, the proportion between the greatest diameter of the eyes and the length of the carapace is like 1 : 8,2, in the other female, of which the carapace is 6,8 mm. long and 4,2 mm. broad, it is like 1 : 7,7; in both females the eyes are of a light fawn colour, with the inner border of the cornea blackish. Antennular peduncle, stylocerite and flagella as in the female from Stat. 297. In the larger of the two females the antennal scale (Fig. 64 h) is 3,1 mm. long, not yet half as long as the carapace, and 2,5 — 2,6-times as long as broad in the middle; the scale appears thus comparati vely broad er than in the female from Stat. 297, the terminal spine, long 0,36 mm. and 0,15 mm. broad at base, is distinctly shorter than the lamella and on the outer third part of the upper surface of the scale numerous long hairs occur, which were not found in the female from Stat. 297. The antennal peduncle, 1,7 mm. long and 0,36 mm. thick, is a little thicker than in the specimen from Stat. 297 and extends only to the distal third part of the scale. External maxillipedes as long as in the female from Stat. 297. The anterior legs (Fig. 642') reach a little beyond the tip of the antennal scale, exopodite apparently wanting. A spine occurs at the far end of the upper border of the merus and a SIKOGA- EXPEDITIE XXXIX O3. 35 -74 smaller below it, on the middle of the distal outer margin ; there is a strong- spine on the lower outer angle of the distal margin of the carpus, a smaller one at the upper outer angle and a third, as small as the latter, at the lower inner angle. Propodus in the larger female 3,2 mm. long, almost half as long as the carapace, rostrum included, and 3,3 — 3,4-times as long as broad in the middle. Peraeopods of the 2nd pair (Fig. 64/) very short, reaching to the middle of the merus of the anterior legs; of the larger female the merus is 1,06 mm. long and 8,4-times as long as broad in the middle; carpus 0,45 mm. long, almost half as long as the merus, nearly 4-times as long as broad at the distal extremity, of a more slender form than in the female from Stat. 297; palm just as long as the carpus and 3-times as long as broad at the articulation of the dactylus; fingers widely gaping, slightly longer than the palm, though resembling for the rest those of the female from Stat. 297. Following legs and pleopods like in this female. Eggs very numerous, 0,5 mm. long, a little shorter and thicker than in the female from Stat. 297. It is for the present impossible to decide vvhether the slight differences between the females from Stat. 89 and the female from Stat. 297 must be attributed to the former being quite full-grown, the latter not yet or to the former belonging to a distinct variety or species. As regards the Hawaiian type, the chief difference is presented by the antennal peduncle reaching only to the middle of second antennular article, but, like the more elongate shape of carapace and scaphocerite, also this difference may perhaps be owing to the young age of Miss Rathbun's specimen, of which the carapace and rostrum were only 5,3 mm., the abdomen, telson excluded, 10,5 mm. long. The examination of a larger number of specimens both from the Hawaiian Islands and the Indian Archipelago shall be necessary to elucidate and decide these questions. General distribution: Hawaiian Islands (Rathbun). 3. Pontophilus modestus de Man. PI. XXII, Fig. 65 — 65J. Pontcpliilus modestus j. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks Museum van Natuurlijke Historie te Leiden. 191S, Deel IV, Afl. 3, p. 162. Stat. 253. Dec. 10. 5°48'.2 S., I32°I3'E. West of Kei-islands. 30401. Bottom grey clay, hard and crumbly. 2 specimens. This species belongs to that Section, in which the abdomen is smooth and the carapace has only one spine in the middle line; the nearest allied forms are apparently Pont. trispinosus Hailstone, Pont. candidus Kemp (especially the male) and Pont. plebs Kemp. The two specimens that are of unequal size, do not agree in all details with one another, so that the larger shall be described as the type. This specimen is 21,35 mm., long, measured in the middle line, the carapace being 5,2 mm. long, the abdomen 16,15 mrn- Carapace and abdomen smooth. The carapace (Fig. 65, 65^), which is 1,6-times as long as broad, the rostrum included, shows its greatest width at the level of the hepatic spines. The rostrum (Fig. 65^), measured to the level of the orbital margins, proves to be 0,6 mm. long, i. e. one-eighth -/O the length of the rest of the carapace, and reaches to the middle of the eyes; it is dorsally hollowed, the lateral borders converge from the base to a little beyond the middle and diverge thereupon slightly to the anterior margin, which is straight, truncate with rounded lateral angles. The rostrum is 0,16 mm. broad in the middle and immediately behind the anterior margin 0,19 mm., the latter being one-third the length, while the rostrum proves to be 3,75-times as long as wide in the middle. The lateral margins of the rostrum and the orbital margin are glabrous, not hairy. The orbital margin from the antero-external angle of the rostrum to the orbital spine appears semi-circular, so that the very small, orbital spine reaches to the middle of the eyes, almost as far forward as the rostrum. Antennal spine strong, reaching beyond the level of the eyes, slightly divergent and buttressed by a long, sharp carina. From the orbital margin, from a point situated a little farther distant from the rostrum than from the orbital spine, a shallow groove runs at first obliquely outward and backvvard and then curves towards the uppermost of the three spines on the side of the carapace ; this groove is bounded at the inner side by a ridge, so that the surface of the carapace at the inner side of this ridge is situated at a somewhat higher level than outside of it. A much finer suture runs from just outside the orbital spine backward to near the upper of the three lateral spines of the carapace. There is no minute spine close to and just below the antennal spine as occurs in Pont. Kempii and other species. At nearly one-sixth its length from the base of the rostrum the carapace bears one well-developed, acute spine, directed forward and slightly upward ; from this spine a short rounded carina runs backvvard, that already disappears before the middle of the carapace, while the rest of the latter is rounded. Midway between this spine and the rostrum a rather deep furrow runs transversely across the carapace. As already remarked, the carapace is armed at either side with three spines. The ist or uppermost is situated posterior to the orbital spine, just behind the level of the dorsal spine, and buttressed by an obtuse carina, which in a lateral view of the carapace runs backvvard and slightly downward ; it is a little smaller than the dorsal spine. The 2nd or hepatic spine, as large as the dorsal, is placed a little in advance of it, on a level with the carinated antennal spine; the hepatic spine is not carinated and half as far distant from the ist as the ist from the dorsal spine. The 3rd spine, finally, as large as the hepatic, is placed midway between the latter and the antennal spine, at a slightly lovver level, immediately behind the antennal crest. From the antennal spine a shallow groove runs backward and curves tovvard the hepatic spine, which is also separated from the 3rd spine by a groove. A few hairs cccur on the branchial region and just below the third and the antennal spine. Abdomen 3-times as long as carapace, rostrum included ; it is perfectly smooth, neither sculptured nor carinated. Anterior and posterior margins of the pleura rounded or obtuse; posterior margin of 3"' tergum transverse, not projecting at all. Sixth somite 3,1 mm. long, one and a half as long as the 5"1, 4, 3-times as long as thick in the middle, not grooved above; the outer angles of the posterior margin terminate each in a very small spine, 0,06 mm. long, the only spines that one observes on the abdomen. Telson 3,75 mm. long, a little longer than the ólh somite, strongly tapering, flattened above; there are two pairs of dorso-lateral spinules, long 0,12 mm., the anterior pair just behind the middle, the other at the posterior fifth ; the vvidth, 0,22 mm., of the tip is one-third the width of the base of the telson, the tip (Fig. 65c) 276 ends in a short acute apex and is only half as long' as wide. At either side of the tip 3 spines are implanted, the ist is 0,4 mm. long, reaches by almost its whole length beyond the apex and is feathered, the 2nd, 0,52 mm. long, the longest of all, is glabrous, the 3rd at the outer angles as long as the dorsodateral spinules. Inner uropods narrow, distinctly shorter than the telson, outer uropods a little shorter than the inner. Eyes large, the greatest diameter measuring one-sixth the length of the carapace; cornea of a dark purplish colour, facets rather large. The antennular peduncle reaches to just beyond the middle of the antennal scale, antero- external angle of basal joint spiniform, subacute and a smaller spine occurs on the distal margin of this joint; 2nd and 3rd joint together shorter than ist, 3"1 a little longer, but less broad, than 2nd; lateral process lamelliform, rounded, a little shorter than ist article ; upper flagellum measuring one-third the length of the carapace, reaching by half its length beyond the antennal scale and rather broad, just as broad as the middle of the rostrum. Tooth at the infero-external angle of 2nd antennal article obtuse with a minute acute tip, peduncle a little shorter than the scale. Antennal scale (Fig. 65c/) 1,75 mm. long, one-third the length of the carapace, rostrum included, twice as long as broad, the greatest width just behind the middle; it narrows moderately anteriorly, the slightly arched distal border is still rather broad and makes an obtuse angle with the inner margin ; terminal spine not or hardly exceeding the apex of the lamella, outer margin straight, unarmed. Hxternal maxillipedes reaching by almost the whole length of their ultimate joint beyond the antennal scale, ultimate joint one and a half as long as the penultimate. The ist pair of peraeopods (Fig. 65 e) project by three-fifths their propodus beyond the antennal scale. Merus slender, with a very small, acute spine at the distal extremity of the upper border and with the margins setiferous ; the carpus appears in a lateral view one and a half as long as thick and is unarmed; propodus of subchela half as long as the carapace, rostrum included, slender, 4,6-times as long as wide in the middle, "thurnb" measuring L/n the length of the propodus, slender, 3-times as long as broad at its base and formed of a single acuminate spine. The second peraeopods extend to the far end of the merus of the ist pair and are clothëd with long setae. Carpus 0,6 mm. long, 3-times as long as thick distally. Chela a little longer than carpus, palm slightly broader than long, fingers 3-times as long as the palm, a little gaping, immobile finger distinctly broader than the dactylus. Third legs very thin, as long as the ist pair. Fourth (Fig. 65/) and 5th pair (Fig. 65^) stout, 4,h stouter than 5th. The 4"1 pair reaches hardly beyond the antennal scale, the 5* hardly beyond the 2nd joint of the antennal peduncle. Carpus of 4"' pair 0,96 mm. long, 0,38 mm. broad, 2,5-times as long as broad. Propodus 1,6 mm. long, about 1,7-times as long as the carpus, broadest at the proximal third, the greatest breadth one-sixth the length. Dactylus slender, tapering, nearly straight, half as long as the propodus. Excepting the dactylus this leg is fringed with long hairs especially along the upper margin. The carpus of the 5"1 leg is 1,06 mm. long, a little longer than that of the preceding pair, and 3,5-times as long as broad in the middle. Propodus 1,9 mm. long, longer than that of the 4"1 pair, 8-times as long as the greatest width at the proximal sixth and narrowing regularly 277 towards the distal end. Dactylus almost half as long as the propodus, resembling that of the 41'1 peraeopods. Exopodite of 2nd pleopod (Fig. 65 /i) 1,8 mm. long, 4,7-times as long as broad proximally; the endopodite, 1 mm. long and 5-times as long as broad, is implanted at a somewhat lower level and reaches therefore not yet to the middle of the outer branch. No tracé of stylamb-lys. Both the exo- and the endopodite are fringed with long feathered setae. The other specimen differs by the following : 1) By its smaller size, the entire length being 14 mm., the carapace 3,8 mm. long, the abdomen 10,2 mm.; the 6th somite is 1,8 mm. long, 0,5 mm. thick in the middle, the telson 2,65 mm. long. These numbers show that, in proportion to the length of the carapace, the abdomen, the 6th somite and the telson are a little shorter, the 6th somite, moreover, a little thicker. 2) The rostrum, 0,48 mm. long, measures one-seventh the length of the rest of the carapace, it is 4-times as long as broad in the rr^ddle and the anterior margin is slightly concave. 3) From the gastric spine a carina runs backward to a little behind the middle of the carapace; though this carina is obtuse and not prominent at all, it is, however, quite distinct. 4) The ist or uppermost lateral spine is wanting. 5) The eyestalks show the same ochraceous colour as the body, though a large reniform spot, that occupies almost the whole upper side of the eye, is of a black colour and there is a small tubercle in the notch of the reniform spot. 6) The joints of the upper antennular flagellum are of a more slender shape. 7) The scaphocerite (Fig. 65/) 1,45 mm. long and 0,64 mm. broad, measures a little more than one-third the length of the carapace and is 2,3-times as long as broad; the antero-internal angle of the lamella is more pronounced, though obtuse, and exceeds slightly the terminal spine. Antennal peduncle as long as the scale. 8) The peraeopods of the ist pair (Fig. 657'), that reach only by one-fifth the propodus beyond the antennal scale, are of a stouter shape. Propodus of subchela 1,6 mm. long and 0.48 mm. wide in the middle, not yet half as long as the carapace and 3,33-times as long as broad in the middle; "thumb" measuring l/B the length of the propodus. 9) The exopodite of the 2nd pleopod is 1,2 mm. long and 4,6-times as long as wide proximally, showing the same form as in the type; the endopodite is half as long and 4-times as long as broad, but, being implanted at a- lower level, reaches only along the proximal fourth of the exopodite. No tracé of stylamblys. The principal differences are the absence of the ist or upper lateral spine of the carapace and the stouter shape of the 1 sl pair of peraeopods, while the others are no doubt partly owing to the difference of age. In neither of the two specimens the upper antennal flagellum shows the characters proper to the male : except the first, the joints of this flagellum appear, indeed, in the male of other species much broader than long, but in both specimens from Stat. 253 they are longer than broad. W'hen therefore the two specimens belong to the same sex, the smaller one should be 27S regarded as a variety — but the examination of a larger number of specimens is necessarv to elucidate and decide this question. 4. Pontopkilus incisus Kemp. PI. XXII, Fig. 66, 66e on either side of the micldle line of the 2nd abdominal somite is broken in two by a vertical furrow. Rostrum triangular, bidentate at apex . . propensalata (Bate), var. hilarula de Man ea Apices of the abdominal pleura not truncated, at least those of the 2nd somite subacute. ƒ, Last thoracic sternum of the adult female not carinated. From the anterior extremity of the median crest of the 31'1 abdominal somite a ridge runs backward and slightly outward, which is separated by an interruption from the transverse ridge near the posterior margin. Huge spine at the anterior extremity of the lateral crest of the carapace only slightly turned outward . Sibogae de Man ƒ 's Last thoracic sternum of the adult female sharply carinated. On the 3rd abdominal tergum the ridge on either side of the median crest passes without an interruption into the transverse ridge near the posterior margin. Huge spine at the anterior extremity of the lateral crest of the carapace strongly turned outward. Sibogae de^lan^vawititermediade'Slan d„ Median carina of the carapace with 4 or 5 teeth or serrations. c\ Carpus of 2nd peraeopods longer than the chela. /1 A tooth on either side of base of rostrum. Antennal scale almost twice as long as wide . (P. GoURRET, Révision des Crustacés podophthalmes du Golfe de Mar- seille, 1888, p. 143, PI. XII, figs. 19—23 et PI. XIII, figs. 1 — 10.) /„ No tooth on either side of base of rostrum .... (L. A. BOR.RADA1LE, in: Trans. Linnean Soc. London, Vol. XVII, 1917, p. 411, PI. 59, fig. 12.) e.2 Carpus of 2nd peraeopods shorter than the chela . (F. Doflein, üstasiatische Dekapoden, München, 1902, p. 620, Taf. I, figs. 4, 5.) a2 Second lateral carina of the carapace not interrupted, hepatic groove absent; lateral parts of the ist and 2nd abdominal somites with sharp longitudinal keels that are continuous with those on the carapace. /', First lateral carina of carapace with 7 teeth, second with 7 — 9. Antennal scale little longer than broad. cx Fourth abdominal somite with only one lateral carina on each side orientalis Hend. (J. R. Henderson, A contribution to Indian Carcinology, 1893, p. 446, PI. XL, figs. 16, 17.) Lacazei (Gourret) rugulosa Borr. x) Habcreri (Doflein) 1) This species is placed under i/2, because in the figure the median carina of the carapace appears 5-dentate. Borradaii.k's description, however, is insufficiënt. 294 e„ Fourth abdominal somite with three lateral parallel carinae on each side Rathbuni de Man ó2 First lateral carina of carapace with 4 teeth, 2nd lateral with 3 to 6. Antennal scale much longer than broad. ^"j Second lateral carina of carapace with 5 or 6 teeth, marginal with 3; median carina of 2nd abdominal tergum bispinous andamanensis W.-Mas. (A. Alcock, 1. c, 1901, p. 121.) e, Second lateral carina of carapace with 3 teeth, marginal with 2 ; median carina of 2nd abdominal tergum unispinous bengalensis W.-Mas. (A. Alcock, 1. c. 1901, p. 122.) 1. Aegeon pennata (Batej. PI. XXIV, Fig. 70 — ~tod. Pontocaris pennata C. Spence Bate, Report Challenger Macrura, 1888, p. 499, PI. XCI. Pontocar is pennata A. E. Ortmann, in: Proc. Acad. Nat. Sciences Philadelphia 1895, p. 175. ? Aègeon affine A. Alcock, A'descript. Catal. Indian Deep-Sea Crustacea, Calcutta 1901, p. 118. Aegeon pennata H. Balss, in: Sitzungsber. Kais. Akad. Wiss. Wien, N° IX, Jahrg. 1914, p. 137. Aegeon obsoletum H. Balss, Ostasiatische Decapoden II. Die Natantia und Reptantia. München, 1914, p. 70, Taf. I, fig. 3. Aegeon pennata H. Balss, Die Decapoden des Roten Meeres. I. Macruren. Wien 191 5, p. 32. Aegeon pennata Stanley Kemp, Records of the Indian Museum, Vol. XII, Part VIII, December 1916, Calcutta 1916, p. 376. Illustrations of the Zoology of the "Investigator"', PI. LI, figs. 3, 3^ and 4, Stat. 306. Febr. 8, 1900. 8°27'S., 122°S4-'.S E. Lobetobi Strait. 247 m. Bottom sandy mud. 2 males and 2 females, one of which is ovigerous. Stat. 312. Febr. 14, 1900. 8° 19' S., ii7°4i'E. Saleh Bay, Sumbawa. 274 m. Bottom fine, sandy mud. 2 males and 1 adult female without eggs. These specimens certainly belong to the typical species described by Spence Bate. Though Aegeon affinis Alcock and A. pennata (Bate) are considered as specifically identical by Dr. Calman, who was enabled to compare co-types of the former with the three Challenger types of the latter (S. Kemp, 1. c), in my opinion, however, on account of the following observations the species from off Bombay should be considered at least as a distinct local variety affinis of A. pennata (Bate). In the first place I may call attention to the fact that the Challenger types are young animals: according to Spence Bate, indeed, the entire length was only 24 mm. (carapace 7 mm., abdomen 17 mm.), whereas the ovigerous female (Fig. 70) from Stat. 306 measures 43 mm., being almost twice as long. The adult female from Stat. 312 has the same size, while the largest male is 37 mm. long (carapace 11 mm., abdomen 26 mm.), the male presenting, like in other species, a somewhat smaller size than the female. When the present adult specimens are compared with the figures 3 and 4 of Plate LI of the "Illustrations", the body appears decidedly less broad in proportion to the length than in the species from off Bombay: while in Fig. 3 (the female) the width of the 2nd abdominal somite is just one- fourth and in Fig. 4 (the male) one-fifth the whole length from the tip of the rostrum to that of the telson, in the three females of the typical species it is only one-fifth and in the males (Fig. 70^7) only about one-sixth the entire length. In Aegeon affinis all the carinae of 295 the carapace are described as coarsely serrate, excepting the supra-marginal. In all the present specimens, excepting the female from Stat. 312, however, the posterior moiety of the lateral crest of the carapace, i. e. the middle one of the three at either side of the median dorsal carina, ends anteriorly in a sharp tooth, directed more or less obliquely outward and forward, and behind it there is but one small notch, while the rest of the moiety is smooth till the posterior margin; the posterior moiety runs, in these specimens, straight backward, parallel with its fellow at the other side of the carapace. In the adult female from Stat. 312 the posterior moiety of the lateral crest is slightly curved outward like in Fig. 3 of the "Illustrations" and behind the anterior spine one observes three much smaller ones, of which the posterior is placed on the left side nearly in the middle, on the right a little behind the middle; also in the female without eggs from Stat. 306, of which the carapace is 11,5 mm. long, measured in the middle line, on the left side traces of two, on the right side of three minute prominences are found behind the anterior spine. -*- In all the specimens the rostrum is bifid at the tip and the spine on either side at the base seems to be larger than in the species from off Bombay. When the rostrum is examined under the microscope, the triangular notch between the two minute teeth at the apex proves to vary in form and size : in the ova-bearing female the notch is wide anteriorly, the inner margins of the two teeth diverge distinctly forward, so that the teeth are easily perceived, when only examined with a magnifying glass, but in other specimens, as e. g. in a male from Stat. 306, the interspace is much narrower, the two teeth run here nearly parallel, close to one another, and in such specimens the rostrum, when only feebly magnified, will often appear simple and sharp-pointed, though being indeed bidentate. This is perhaps also the case in one of the three Challenger types, in which specimen the rostrum has been described as "sharp-pointed" (Stanley Kemp, 1. c, p. 377). In the male the antepenultimate thoracic sternum is smooth, the two posterior sharply carinated, in the female the three posterior thoracic sterna are smooth. In the variety affinis, however, in the male the last three thoracic sterna are sharply carinated in the middle line, in the female the carination of the antepenultimate sternum is distinct, but that of the last two is obsolescent. According to Prof. Alcock's description the 2nd pair of legs differ in the two sexes of the species from off Bombay and we read here: "in the adult female they are almost as long as the first pair, whereas in the adult male, and in the young, they reach but a very little way beyond the carpal articulation of the hand". In the figure 4 of the "Illustrations", that represents the male, the carpus of the 2nd pair appears as long as the chela, but in the figures 3a and 3, of the female, one and a half to twice as long. In all the present specimens, however, the 2nd pair of peraeopods (Fig. 70^) differ not in the two sexes, reaching both in the male and in the female but little beyond the carpal articulation of the hand. In the ovigerous female the 2nd legs extend by two-thirds the chela beyond the carpal articulation of the hand of the anterior legs, the carpus (2,8 mm.), which is 7-times as long as thick at the distal extremity, is one-sixth longer than the chela (2,4 mm.); the dactylus, 1 mm. long, is but little shorter than the palm and the greatest width (0,54 mm.) of the chela measures about one-fourth its length. 2g6 The preceding observatioos justify my opinion that Aegeon affinis Alcock must at least be considered as a distinct local variety of A. pennata (Bate). Aegeon obsoleta Balss seems indeed to be identical with the typical species, because in the figure 3 of the original description (1. c.) the posterior moiety of the lateral crest appears smooth and straight, not coarsely serrulate. In all the present specimens the deep vertical furrow is well-defined, by which, on either side of the middle line of the 2nd somite, the two tubercles are separated from one another : in A. propensalata (Bate) these two tubercles are coalesced to a broad sinuous ridge. The two submedian carinae of the 6th somite are armed in the ovigerous female with 5 retrorse sharp teeth, that gradually increase in length from before backward, in younger indivi- duals there are only 4 or 3. Eggs very numerous, small, 0,8 mm. long, half as thick. Table of measurements in millimeters. Length of carapace, measured in the middle line . . . Distance between the apices of the large hepatic spines. Length of abdomen. Width of 2nd abdominal somite, looked at from above Entire length I 2 0" 9 1 1 12,7 9 10,7 26 30,3 6,4 9 37 43 N° 1 and 2 larger male and larger ovigerous female from Stat. 306. Geographical distribution: Japan (near Enoshima, Dzushi, Sagami Bay) (Balss); Arafura Sea (Bate); off the coast of Burma, Bengal and Madras (Kemp); Arabian Sea (Kemp); off Bombay (Alcock) ; Persian Gulf (Kemp) ; Red Sea (Balss). 2. Aegeon propensalata (Bate) var. hilarula de Man. PI. XXIV, Fig. 71 — 71/. Aegeon propensalata (Bate), var. hilarula J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XVI, Afl. 2 and 3, 191S, p. 301. Confer also the following papers : Pontocaris propensalata C. Spence Bate, Report Challenger Macrura, 1S8S, p. 496, PI. XC, figs. 2, 3; PI. LXXXVI, fig. 5. Pontocaris propensalata A. E. Ortmann, Proc. Acad. Nat. Sciences Philadelphia, 1895, p. 175. Pontocaris media A. Alcock and A. R. S. Anderson, Annals Mag. Nat. History, April 1899, p. 282 (teste W. T. Calman). Aegeon medium A. Alcock, A descript. Catalogue Indian Deep-Sea Crustacea, Calcutta, 1901, p. 120 (teste W. T. Calman). Aegeon propensalata Stanley Kemp, in: Records Indian Museum, Vol. XII, Part VIII, Calcutta 1916, p. 377. Illustrations of the Zoology of the "Investigator", Plate XLI, figs. 6, 6a. Stat. 47. April 8/12. Bay of Bima, near south fort. 55 m. Bottom mud with patches of fine coral sand. 1 male. Unfortunately the abdominal pleura of the typical Pontocaris propensalata have not been described by Spence Bate. According to Dr. Calman, who was enabled to compare co-types of Aegeon medium with the type of Bate's P. propensalata (Stanley Kemp, 1. c), 297 these two species are identical and, the abdominal pleura of A. medium being truncated inferiorly ("Illustrations", 1. c), we may draw the conclusion that they are also truncated in the type of A. propensalata. In the specimen from the Bay of Bima the abdominal pleura are truncated ancl show the same characteristic form as in A. medium; also as regards the carination of the carapace this specimen agrees with this species, but, as there are in other respects some slight differences, it is considered as a new variety, for which the name of hilarula is proposed. The male (Fig. 71, 71a, Jió) is probably young, for, measured in the micldle line, the carapace appears to be 7,7 mm. long, the abdomen 18 mm., the entire length 25,7 mm. from tip of rostrum to tip of telson, whereas the male of A. propensalata attains a length of 34 mm. The triangular rostrum (Fig. 7 1 e) that reaches only to the middle of the eyestalks, ends at the tip in two small teeth, that are separated by a triangular notch; the inner margin of each tooth runs parallel with the outer margin of the other. The tooth on either side of the base of the rostrum is rather small, not larger than the teeth at the apex; the distance (0,56 mm.), measured in the middle line, between the line uniting the two teeth at the base and that which unites the apices of the two apical teeth, is one-fifth shorter than the distance between the tips of the two teeth at the base and the latter nearly 5-times as long as the distance between the tips of the two apical teeth. The rostrum of A. propensalata is not cleft at the tip and has a larger spine on either side of the base. The processes, with which the median, dorsal and lateral carinae of the carapace are armed, are obtuse, blunt. The median carina consists of eight processes, that are moderately prominent and of which the posterior is a little longer than the rest ; the tubercles of the dorsal carinae, on each side of the middle, are more prominent, 8 on the left, 9 on the right and the four, respectively five posterior tubercles are smaller than the five, respectively four anterior. Orbital margin with two fissures, spine at the outer angle almost as long as the rostrum. The large tooth or spine (Fig. 71 tf') at the anterior extremity of the lateral carina extends as far forward as the distal extremity of the basal antennular article and runs straight forward with the tip slightly outwards ; behind it are two obtuse teeth of which the anterior is shorter, though more prominent than the posterior; the 7 or 8 processes of the posterior moiety of the lateral crest are little prominent, especially the 4 or 5 posterior, and the anterior extremity is obtuse. The serration of the supra-marginal carina, finally, is very obscure, like in the Challenger type (Stanley Kemp, l.c), so that Spence Bate even described it as smooth; the 1 1 or 1 2 processes, by which it is composed, become, however, perceptible when the carapace is looked at obliquely from behind and the anterior extremity is blunt, little prominent. Branchiostegal angle subacute, reaching as far forward as the eyes. Last three thoracic sterna sharply carinated in the middle line. The sculpturing of the abdomen is well-developed, prominent and resembles that of A. media, except that there is no broad sinuous ridge on either side of the middle line of the 2Qd somite and extending obliquely throughout its length, but, like in A. pennata (Bate), two tubercles separated by a vertical furrow that reaches to near the median crest. The posterior sculptured part of the 2nd tergum (Fig. 71 6') appears, measured in the middle line, hardly half as long as that of the 3rd, whereas it appears distinctly longer in SIEOG A-EXPEDITIE XXXIX a3. 38 298 A. propensalata, according to the figure 6 of the "Illustrations". The abdominal pleura fully resemble those of A. propensalata ("Illustrations", fig. 6a). The ist pair of legs are furnished with a well-developed exopodite. The 2nd legs (Fig. 71/) are short and project only by the fingers beyond the carpal articulation of the hand of the anterior pair; the carpus (1,4 mm.), which is' slender and 7-times as long as thick at its distal extremity, is hardly longer than the chela (1,32 mm.), which is almost 5-times as long as broad (0,28 mm.) near the articulation of the fingers ; the fingers (0,62 mm.) are nearly as long as the palm (0,7 mm.). The 2nd legs therefore much agree with Bate's figures 2 and 3 (1. c), but in the figures 6 and 6a of the "Illustrations" (1. c), they reach much farther forward, the chela appears longer than the carpus and the fingers shorter in proportion to the palm. The 3rd legs are setaceous and extend by the dactylus and half the propodus beyond the forwardly extended propodus of the ist pair; the dactylus appears half as long as the propodus, which is as long as the merus, whereas the carpus is a little longer. When A. media is indeed identical with A. propensalata (Bate), the 3rd legs appear in the figures 6 and 6a of the "Illustrations" of a too stout shape and the carpus appears not longer than the merus or propodus; unfortunately in Bate's figure 3 the boundaries between dactylus and propodus like between merus and ischium have not been indicated. Geographical distribution of the typical A . propensalata (Bate) : Botany Bay (Whitelegge); Kei-islands (Bate); Andaman Sea (Alcock). 3. Aegeon Sibogac de Man. (PI. XXIV, Fig. 72 — 72/). Aegeon Sibogae J. G. de Man, in: Tijdschr. cl. Neder]. Dierk. Vereen. (2) Dl. XVI, Afl. 2 and 3, 1918, p. 302. Stat. 15. March 15. 70 2'. 6 S., II5°23'.6E. Bali Sea, south of Kangeang. 100 m. Bottom fine coralsand. 1 female without eggs. Aegeon Sibogae belongs to that Section of the genus, in which the hepatic groove is well-defined, and, the abdominal pleura being not truncated inferiorly, appears closely related to A. pennata (Bate) and its variety ajfinis (Alcock). Measured in the middle line, the carapace proves to be 13,3 mm. long, the abdomen 31,7 mm., entire length 45 mm.; the body, 4,6-times as long as the 2nd somite is wide, appears comparatively a little wider than the ovigerous female of A. pennata (Bate) from Stat. 306, that has nearly the same size. Rostrum triangular (Fig. 72, 72a, 72/;), reaching to the middle of basal antennular article and to the cornea of the eyestalks; to the naked eye and even when using a feeble magnifying-glass, the apex appears simple and subacute, under the microscope, however, it proves to end in two extremely minute teeth, of which the tips are only 0,06 mm. distant from one another. Like in A. peniiata a conical tocth stands on either side at the base; the length (1,44 mm.) of the line uniting the apices of these two teeth is just one and a half as long as the distance (0,96 mm.) between the tip of the rostrum and that line, measured in the middle ; the two basal teeth are rather large, measuring one-fifth the distance between the tip of the rostrum and the base of these teeth. The carapace which is 13,3 mm. long and 11,5111111. 299 wide in the middle, is a little wider than that of the female of A. peuuata, in which these numbers are 12,5 mm. and 10 mm. The ist or median carina and the 2nd or dorsal carinae differ not from those of A. pennata, the median carina is composed of 10 teeth or tubercles, the left dorsal of 8, the right of 9; all are rather prominent and sharp, though decreasing in size and prominence from before backward. The huge, wing-like and sharp spine at the anterior extremity of the lateral carina reaches to the level of the middle of the 3rd antennular article; this spine is but slightly turned outward, much less than in A. pennata, so that the distance, 10,75 mir"i between the apices is even a little smaller than the greatest width of the carapace in the middle. Orbital spine nearly as long as the rostrum. Behind the terminal spine ancl the deep cervical groove the lateral carina is armed with two teeth, of which .the anterior is sharp and reaches almost to the level of the orbital margin, while the posterior is much smaller and subacute. The posterior moiety of the lateral crest resembles that of ./. pennata (Bate) var. affinis Alcock (Illustrations Zoology "Investigator", Plate LI, fig. 3), it ends ante- riorly in a sharp tooth behind which to the posterior margin occur 5 smaller ones; the ist or anterior is also sharp, but the following are obtuse. In the typical pennata one observes usually but one trifling tooth behind the sharp spine at the anterior extremity. The supra-marginal carina, which in A. pennata is smooth, appears in A. Siöogae distin ctly serrate by 13 or 14 processes, that are all obtuse excepting the anterior which is acute; the processes are smail, little prominent. Branchiostegal spine acute, reaching as far forward as the huge anterior spine of the lateral carina. The antepenultimate thoracic sternum (Fig. 72^) is armed in the middle with a strong, laterally much compressed tooth, the sharp tip of which is curved forward. A similar, but much smaller and hardly compressed tooth occurs mi the penultimate sternum, but the posterior sternum is smooth, without any tracé of carination, though the anterior boundary appears slightly thickened, just in the middle. The abdomen is sculptured exactly after the same pattern as that of A. peiniata, but the sculpturing is much more prominent. Like in A. peiniata, on either side of the median crest of the 2nd somite (Fig. 72 c/), that ends anteriorly in a curved tooth, occur two tubercles, which are separated by a deep vertical furrow. The two submedian carinae of the ^h somite are entire and terminate posteriorly in a small sharp tooth, whereas they are armed in A. pennata with a small acute tooth just behind the middle. The tergum of the 6th somite is a little broader in proportion to its length and the two submedian carinae are therefore a little more remote from one another; each is trispinose, the posterior spine being a little longer than the two anterior. The abdominal pleura resemble those of A. pennata, but the lower apex is less sharp, on the ist and 2nd subacute, on the following rather blunt. Eyepeduncles a little smaller than those of A. pennata. Antennulae and antennae like in this species. The external maxillipeds project by their terminal joint beyond the tip of the antennal peduncle and have a less slender form than those of A. pennata. The peraeopods of the ist pair that bear a short setose exopodite, differ from those of A. pennata by their stouter shape (Fig. 721? and Fig. "joe); in the ovigerous female of A. pennata the chela without the dactylus is 7,5 mm. long and 1,9111111. broad in the middle, in the type of A. Sibogae, however, / 300 mm. long and 2,3 mm. broad, so that in the latter the propodus is only three-, in A. pennata four-times as long as broad. Like the propodus, also the dactylus has a less slender form. A sharp spine occurs at the far end of the outer margin of the merus. The 2nd peraeopods (Fig. 72/) are longer than those of A. pennata and show also different measurements. These legs project by the chela and half the carpus beyond the carpal articulation of the chela of the ist pair; the carpus (4,5 mm.) is a little more than one and a half as long as the chela (2,75 mm.) and the fingers that are a little gaping, are nearly half as long as the palm, the chela, finally, is a little slender er, 6-times as long as broad. The setaceous peraeopods of the 3"1 pair reach with the dactylus beyond the propodus of the anterior legs, the relative measurements of the joints are the same as those of pennata, but they are a little less slender. The two posterior legs present no differences. 4. Aegeon Sibogae, var. intermedia de Man. PI. XXIV, Fig. 73, 73a. Aegeon Sibogae var. intermedia J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereeniging, (2) Dl. XVI, Afl. 2 and 3, 1918, p. 303. Stat. 302. Febr. 2. 1900. 10° 27'. 9 S., I23°28'.7E. Strait between the islands of Rotti and Timor. 216 m. Bottom sand and coral sand. 1 female without eggs. The carapace of this female is 11,7 mm. long, the abdomen 28,3 mm., entire length 40 mm. 5 the body appears nearly 5-times as long as the 2nd somite is wide. The rostrum is a little less broad at base in proportion to its length than in the typical specimen from Stat. 1 5 and the apex is obtuse. though perhaps damaged. Carapace like in the type, but the huge, wing-like spine at the anterior end of the lateral crest is much more turned ontward, as much as in A. pennata and a line uniting the apices runs along the middle of 2nd antennular article ; the serration of the supra-marginal carina is rather obtuse, though the 13 or 14 prominences are still perceptible. The antepenultimate thoracic sternum (Fig. 73) is armed in the middle line with the same, acute, compressed tooth as in the type ; the penultimate and the posterior sterna are, however, both sharply carinated, but the dentiform dis tal extremities of these two carinae do not project upward. The abdomen agrees with the typical species except the 3ld tergum. From the anterior extremity of the median crest (Fig. 73 d) an oblique carina runs backward on either side of it and this carina curves without i n t e r r u p t i o n into the subtransverse crest near the posterior margin: in the typical A. Sibogae, however, the oblique carina is separated by an interruption from the subtransverse crest. The peraeopods agree with the typical form, the ist pair bears also a short, setose exopodite, but the carpus of the 2nd pair is hardly one and a half as long as the chela. 5. Aegeon Rathbuni de Man. PI. XXIV and XXV, Fig. 74—74^. Egeon orientalis M. J. Rathbun, in: U.S. Fish Commission Bulletin for 1903, Part III, Wash. 1906, p. 911, PI. XXIII, fig. 3 (nee Aegeon orientalis Henderson). ;oi Aegeon Ratkbuni J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereeniging, (2) Dl. XVI, Afl. 2 and 3, 191S, p. 304. Stat. 8g. June 21. Pulu Kaniungan Ketjil. 11 m. Bottom coral. 1 male. The characters, mentioned by Miss Rathbun, are sufficiënt to distinguish this species from A. orientalis Henderson, about which Stanlky Kemp lias lately furnished useful information (Stanley Kemp, in: Records Indian Museum, Vol. XII, Part VIII, Calcutta 1916, p. 378). The photograph in Miss Rathbun's paper is unfortunately not clear, so that new figures are given and she also not made mention of the length. The male from Stat. 89 (Fig. 74, 74a) is 28 mm. long, the rostral spines included (carapace 8 mm., abdomen 20 mm.). The two conical, subacute teeth in which the rostrum (Fig. 7 \&) ends anteriorly and which are separated by a broad interspace, reach to midway the short eyestalks; on either side at the base a somewhat smaller spine occurs. The distance (0,5 mm.) between the line, long 0,72 mm., uniting the tips of the two basal teeth and the line uniting those of the two apical teeth, is only one-fourth longer than the distance (0,4 mm.) between the apices of the two anterior teeth. Of the 5 spines of the median carina the middle one is the smallest. First or upper lateral carina 7-spined, second armed on the left side with 9, on the right with 8 spines, thircl on the left side with 5, on the right with 6 spines, including the antero-lateral spine; the spines of the 2ml and 3"1 row diminish in size posteriorly. Antepenultimate thoracic sternum armed with a strongly compressed tooth, the acute tip of which is directed forward ; the two last thoracic sterna are sharply carinated and the carina terminates anteriorly in a small sharp tooth. The abdomen agrees also with Miss Rathbun's description, the following may still be added. The upper surface of the median crest on the 2nd somite is slightly grooved longitudinally. the median crests on the 3rd and 4th are flattened above, finely punctate, that of the 4th shows moreover an oval impressed point near the anterior extremity and this carina ends posteriorlv in a sharp tooth. Submedian crests of 5th somite entire. Telson 6,2 mm. long, little shorter than the carapace and hardly more than one-fifth the entire length ; it is a little longer than the uropods, deeply grooved longitudinally and the lateral margins of the upper surface are furnished with two pairs of microscopic spinules, of which the anterior pair is placed just in front of the middle, the posterior nearly at the posterior fourth. The pleuron of the ist somite is truncated inferiorly with rounded posterior margin-, ot the two lateral carinae on each side of the 2nd somite the lower forms the boundary between tergum and pleuron, like on the 5th and as also does the lower of the three carinae of the 4th somite; the pleuron of the 2nd is bluntly angulated or almost rounded inferiorly and from each of its rounded lateral margins an obtuse ridge runs backward respectively forward and curving downward; 3ld and 4"1 pleura truncated with rounded, posterior margin; 5th pleuron rounded and armed posteriorly with 2 small spines, of which the larger upper is placed on the level of the upper lateral carina. First abdominal sternum with a rather small, compressed tooth in the middle line, the acute apex of which is directed forward; 2nJ with a similar tooth, though smaller; following with a still smaller and obtuse tooth. Cornea of the eyes black. Stylocerite acute. Antennular peduncle reaching about to the midtlle of the antennal scale; scaphocerite hardly longer than broad with the terminal spine large, reaching just beyond the lamella. First pair of legs probably without exopodite, upper margin of the merus with a short spine at the far end. The legs of the 2nd pair extend to the middle of the propodus of the ist, carpus a little longer than the merus and than the chela, the latter nearly as long as the merus, fingers about half as long as the palm. Third legs setaceous, about as long as those of the ist pair, carpus 3,4 mm. long, one and a half as long as the merus and almost 21/2-times as long as the propodus, dactylus two-fifths of the propodus. Dactylus of 4111 and 5111 pair lanceolate, narrow, a little shorter than the propodi. General distribution: Hawaiian Islands (Rathbun). Sabinea Owen. The genus Sabinea Owen, that differs from the other Crangonidae by the peraeopods of the second pair being simple, not chelate, was hitherto still unknown in the Indopacific : at present, however, science is indebted to the Siboga Expedition in the remarkable discovery of a new species of Sabinea, captured north of Tanah Djampeah Island in the Indian Archipelago. Sabinea septemcarinata (Sabine), the first described species of this genus, ranges in the Siberian Polar Sea from 1700 17' E. westward to the Kara Sea, has been observed in the White Sea, the Murman Sea, the Barents Sea, on the eastern and western coasts of Finmark and in the seas of Spitzbergen, while it has also been taken at the Lofotes and farther south on the west coast of Norway ; this species, however, occurs also on the east coast of North America from Massachusetts Bay to the St. Lawrence estuary, on the west coast of Greenland as far up as Discovery Bay at Grinnell Land, on the coasts of south and east Greenland, all round Iceland and near Jan Mayen. The second species, Sabinea Sarsii S. I. Smith, which is closely related, is distributed from the entrance to the White Sea along the Murman coast and the north and west coasts of Norway to the Skager Rak and the Shetland Islands ; it has also been taken near the Fseroes, all round Iceland and occurs on the east coast of North America from the Gulf of Maine and south of Halifax to Davis Straits. The third hitherto known representative of the genus Sabinea, Sab. hystrix (A. M.-Edw.), a large species attaining a length of 125 mm. from tip of rostrum to tip of telson, ranges from off the island of Guadeloupe, along the east coast of the United States, to Davis Straits and south-west of Iceland. The indopacific species, finally, discovered by the "Siboga", the new Sabinea indica, approaches to Sab. hystrix by the shape of the acuminate rostrum reaching to beyond the ist antennular article and likewise armed with an acute tooth at either side of the base, but it differs considerably from this and from the two other species by the much smaller number of spines on the carapace and by the smooth, unarmed abdomen. Sabinea septemcarinata is found in rather shallow water, the greatest depth not sur- passing 164 fathoms, though in the Bredefjord Sermilik, Southern Greenland, two specimens in a young stage were caught in 220 fathoms (Stephensen). According to Dr. Hansen Sabinea Sarsii goes deeper down and has not been taken in less than 40 fathoms, while on the contrary il has been captured near the Fseroes at a depth of 388. Sabinea hystrix was obtained off Guadeloupe at a depth of 734, off the east coast of the United States in water of 353 — 888, and south-west of Iceland even at 191 2 fathoms ; this species occurs thus at the greatest depth. Sabinea indica, finally, was taken from 218 fathoms upward. Key to the known species of the genus Sabinea Owen. ax Carapace at either side with three denticulated carinae ; abdomen dorsally carinated. b\ Lateral margins of the rostrum unarmed. i\ Rostrum short, hardly overreaching the eyes and obtusely roundeel at the tip; extremity of the telson subtruncated and armed with a series of eight or more spines or stout setae . . . septemcarinata (Sabine) iS. I. SMITH, in: Trans. Connecticut Acad. of Arts and Sciences, Vol. V, Part 1, 1879, p. 57, PI. XI, figs. 5, 9—13). c.2 Rostrum reaching distinctly beyond the eyes and appearing acutely pointed, when looked at from above ; telson terminating in an acute tip, with one or two spines each side. . . . Sarsii S. I. Smith (S. I. Smith, I. c, p. 59, PI. XI, figs. 6—8.) b2 Lateral margins of the rostrum armed proximally with a sharp spine. Rostrum acute, as long as the antennal scales or longer. Telson regularly tapering to the tip, which is acute, unarmed and naked hystrix (A. M.-Edw.) S. I. SMITH, in: Bulletin Mus. Comp. Zool. Cambridge, Vol. X, N° 1, 18S2, p. 3$, PI. VIII, figs. 1 — ib.) Carapace at either side with two keels, the upper unarmed, the lower with two spines. Abdomen smooth, not carinated, excepting the 3rd somite, 'the tergum of which is produced posteriorly to a distinctly compressed carina or gibbosity. Rostrum acute, lateral margins armed proximally with a sharp spine. indica de Man 1. Sabinea indica de Man. PI. XXV, Fig. 75 — 75/. Sabinea indica J. G. de Man, in: Tijdschr. Nederl. Dierk. Vereen., (2) Dl. XVI, Afl. 2 and 3, 1918, p. 304. Stat. 65». May 6. Very near Station 65 (7°o'S., I20°34'.5 E.). North of Tanah Djampeah Island. From 400 m. Bottom pale, grey mud, changing during haul into coral bottom. 1 female without eggs. Measured in the middle line, the carapace (Fig. 75), rostrum included, proves to be 12,5 mm. long; the abdomen, about 35 mm., is nearly 3-times as long, entire length 47,5 mm. The carapace shows its greatest width of 7,2 mm. midway between the apex of the posterior spine in the 304 mid-dorsal line and the posterior border, while the spiniform antero-lateral angles are 6,7 mm distant from one another; the carapace is therefore but little more than one and a half as long .is wide and, the greatest height, above the 2nd pair of peraeopods, being as large as the greatest wiilth, it shows a rather stout shape. The rostrum, 3,5 mm. long, is a little more than one- third as long as the rest of the carapace (Fig. 75 a) and reaches slightly beyond the far end of basal antennular article; the distal half of the upper border is curved upward, the acute tip reaches, however, not to the level of the gastric spine and, while the proximal half of the upper border js rounded, the distal half appears carinated. At either side of the base the rostrum is armed with a slender acuminate spine, that extends as far forward as the eye; the two spines are slightly directed outward and the distance, 0,84 mm., between their apices measures about one- fourth the length of the rostrum. From each spine a sharp carina runs forward on the lateral surface of the rostrum and curves towards the tip, which it does not reach and the curved, carinated, lower border is frinoed with feathered setae. In the dorsal median line the carapace is armed with two large, strongly compressed and acute spines; measured in the middle line the distance between the apex of the anterior or gastric spine from the orbital margin proves to be one-tenth the distance between the orbital and the posterior margin of the carapace. The slightly concave, carinated, upper margin of the gastric spine extends to the posterior or cardiac spine, while the carinated upper margin of the latter is curved and reaches to near the posterior border of the carapace-, the anterior margin of the cardiac spine is a little shorter than that of the gastric and both spines are larger than the rostral spines. The distance, 3,9 mm., between the apices of the two spines is almost one- third the length of the carapace, rostrum included. Orbital spine directed obliquely upward, small, reaching not so far forward as the eye or the rostral spine. Post-antennal spine acute, directed also obliquely upward and reaching a little beyond the level of the eyes, about to the distal third of the rostrum. The infero-lateral border of the carapace is strongly curved; an elevated ridge or carina runs from the obtuse antero-lateral angle, just below the post-antennal spine, close to and parallel with it, to just behind the middle and from here unites with the infero-lateral border itself. The lateral sides of the carapace bear each two carinae, of which the upper is un armed., the lower bispinose. The rounded upper carina runs on the level of the orbita' spine, almost twice as far distant from the infero-lateral than from the upper border of the carapace, the dorsal spines included; this keel begins near the posterior border and reaches, slightly curved and with the concave side turned towards the upper border, hardly beyond the middle of the carapace. The lower keel is formed by two acute spin es, placed immediately behind one another, almost in the same plane; the anterior spine, nearly 3-times as long as the posterior, reaches to just beyond the tip of the gastric spine and the distance, 1,62 mm., between the two lateral spines measures about one-fifth the length of the carapace, without the rostrum and measured in the middle line. From the posterior spine the little prominent and rounded keel runs backward, but fades away at the posterior third of the carapace ; in front of the anterior spine the keel also soon disappears. This keel is separated from the gastric region by the distinct, though shallow, hepatic groove, which is traceable to near the orbital margin ; a shallow groove is also visible between the anterior lateral and the post-antennal spine. 3°5 Inferior apices of branchiae turned backward. First somite of the abdomen smooth. On the tergum of the second a posterior triangular area appears a little elevated with regard to the larger anterior remaining part ; this triangular area is bounded by the posterior margin and anteriorly by two finely crenulated lines, that run from just behind the middle of the tergum with a curve backward and downward, passing into the posterior margin of the pleura. The distance between the posterior margin of the carapace and that of the 2nd tergum is just as long as the length, 7,5 mm., of the 3vd tergum, when we measure in a lateral view the distance between the anterior and posterior extremities of the upper border in a straight line. The 3rd tergum, rounded anteriorly, is produced and elevated posteriorly to a distinctly compressed carina or gibbosity, which in a lateral view appears regularly curved; the upper border is rounded transversely, smooth, hardly punctate, shining and distinctly set off from the slightly concave, finely and closely punctate, lateral parts; on account of this gibbosity the posterior margin of the 3rd somite projects a little backward, though it is rounded. The upper border of this crest widens regularly from before backward and a transverse line or depression at the anterior fourth of the tergum seems to separate this anterior part from the crest. The smooth and rounded 4* somite measures a little more than half the length of the 3rd. Fifth somite a little shorter than 4th, smooth, posterior margin concave ; from each lateral extremity a shallow groove runs forward, that separates the tergum from the pleuron, though it fades away on the middle. Sixth somite a little longer than 4th, flattened above and terminating at either side of the posterior margin in an acute spine. Different from the three other species of this genus the abdominal pleura are s m o o t h , unarmed and resemble much those of Crangon crangon (Linné), the anterior and posterior margins being rounded or obtuse. Telson (Fig. 75^) 8,5 mm. long, one-fourth the length of the abdomen and a little more than one and a half as long as the 6th somite; anterior thircl of upper surface grooved, the rest rounded ; there are two pairs of minute lateral spinules, that are easily overlooked, and the spinules of each pair are not implanted in the same transverse line; a third pair occur at the posterior end of the lateral margins and besides these the acuininate tip (Fig. 75 c), which is almost one and a half as long as broad at base, bears at either side a longer spine, close to the minute spinule and reaching as far backward as the apex. Inner uropod a little shorter than telson, outer uropod slightly shorter than the inner, truncated at the tip and without diaeresis. Eyes well-developed, not contiguous, globular, greatest diameter nearly one-seventh the length of the carapace, rostrum included; the corneal portion, that occupies by far the greatest part of the ophthalmopod, is distinctly faceted by small facets and the pale upper part of the eye is surrounded by blackish pigment, except at the inner side, while the outer and lower part are also of a Hght pale colour. The antennular peduncle reaches until the middle third part of the antennal scale: looked at from below the basal joint appears a little longer than the 2nd and 3rd combined and it is armed, immediately behind the middle of its lower border, with a small, forwardly \\M- SIUOGA-EXI'EDITIE XXXIX a3. 39 3o6 directed spine, while in front of this spine the lower border is sharply carinated. Second joint nearly quadrate, hardly longer than broad, 3vd half as long as 2"'1; inner flagellum half as long as the carapace, rostrum included, outer flagellum a little shorter and less broad than inner. Stylocerite terminating in a long and acuminate spine that reaches to the far end of basal article. Basal antennal article sharply carinated above, near the stylocerite ; the carina runs forward about to the middle and from here obliquely outward to the anterior margin ■ outer spine triangular, acute, reaching to the level of the far end of basal antennular article. Antennal peduncle reaching to just beyond the middle of the antennal scale; the latter, the terminal spine included, is 7,4 mm. long, three-fifths the length of the carapace, and 3,7-times as long as broad in the middle ; the unarmed, straight, outer margin ends in a long, forwardly directed spine, long 0,85 mm., one-ninth the entire length of the scale, and almost 3-times as long as broad at its base ; distal margin of the lamella truncated, nearly as long as the spine. The external maxillipeds reach almost to the truncated distal end of the antennal scales, terminal joint as long as penultimate, antepenultimate joint reaching to the far end of basal antennular article. The ist pair of peraeopods (Fig. 75^, 75^) reach with the propodus to the far end of the scaphocerite and bear apparently no exopodite. The coxopodite is armed at the antero-external angle with a small, acute, tooth, while the inner margin is fring-ed with setae. The sharply carinated, upper margin of the strongly laterally compressed merus ends in a long acute spine, that reaches to the far end of the carpus-, the lower margin is also sharply carinated from the proximal end to a little beyond the middle and this rather prominent carina is lamelliform and terminates in a small, sharp tooth. The upper margin of the outer surface of the carpus ends distally in a well-developed, slender spine and another broader spine, though of the same length, occurs at the far end of the lower margin, two smaller acute teeth exist moreover on the distal border of the upper surface. Chela without the dactylus 5,7 mm. long, almost half the length of the carapace and 1,7 mm. broad in the middle, the propodus being 3,35-times as long as broad in the middle. The very short peraeopods of the 2nd pair (Fig. 75/, 75^) hardly reach to the middle of the merus of the ist. The merus, 1,4 mm. long, is 7-times as long as thick and almost twice as long as the carpus, that measures 0,84 mm.; a seta, 0,36 mm. long, is implanted at the distal extremity of the latter, behind it a shorter one is observed and a still shorter seta exists near the far end of the lower margin. The propodus is 0,6 mm. long and 3-times as long as broad ; on the lower margin of this joint two long setae are implanted in the middle, not far from and behind one another, of which the anterior is 0,72 mm. long, the other a little shorter, and three equally long setae occur at the far end, one also at the far end of the upper margin; probably also on the middle of this margin two long setae will prove to occur, opposite to those of the lower margin. Dactylus long 0,27 mm. and 0,12 mm. broad, the margins run parallel like those of the preceding joint and are glabrous; the rounded extremity of the dactylus bears four long pectinated setae, of which the inner pair are 0,58 mm. resp. 0,68 mm. long, the two external 0,48 mm. Ó^J Only the third leg of the right side is partly preserved; it is very thin, filiform, like in the other species. Like in the genus Pontophilus the peraeopods of the 4th and 5"1 pair are of a much stouter shape than those of the 3rt', but in this species these two posterior legs are subequal, both as regards the length and the thickness of the joints. The legs of the 4th pair (Fig. 75//) project by the dactylus and two-fifths of the propodus beyond the truncated tip of the antennal scale, those of the last pair only by half the dactylus. The merus, carpus, propodus and dactylus of the 4lh pair are respectively ó mm., 4 mm., 4,5 mm. and 1,7 mm. long, those of the 5th pair 5,8 mm., 4,2 mm., 4,6 mm. and 2,1 mm. The upper border of the merus of the 4th pair terminates distally in a small spine and in both pairs there is a tuft of setae at the far end of the propodi, but for the rest these legs are smooth and glabrous. Dactyli of the 4lh pair nearly two-fifths of the propodus, those of the 5th slightly longer; the dactyli are nearly styliform, hardly compressed, slender, tapering to the acute tip, with a tuft of short setae near the latter. The antepenultimate sternum is obtusely carinated in the midclle line anteriorly and produced into a vertically compressed tooth or spine which, gradually narrowing, reaches to the 2nd joint of the anterior legs; the lateral margins of this tooth are slightly raised, so that the surface appears a little concave ; the tip seems to be broken off and has perhaps been acute. The outer branch of the pleopods of the ist pair (Fig. 75/) is 3,8 mm. long, one and a half as long as the protopod, 3,2-times as long as broad in the middle, and fringed on both margins with long, articulated, feathered setae; the inner branch, 2,7 mm. long and 6-times as long as broad, is much shorter and, while the exopodite shows its greatest width in the middle and narrows to both extremities, especially to the distal one, the inner branch shows nearly the s a m e b r e a d t h a 1 o n g its w h o 1 e length, being only narrowed near the base and the distal extremity is broad ly rounded; the margins are also fringed with long feathered setae, which, however, are not articulated, but, besides these, the inner margin is moreover adorned alono; its whole length with long', winding', flexible hairs that are not articulated nor feathered. These long flexible hairs occur also on the inner border of the protopod (Fig. 75/'), except in the middle, while this border is moreover fringed with long, feathered setae. In the female of Sabinea septcmcariuata the inner branch is comparatively shorter and the filamentous appendages much less numerous (C. Spence Bate, Report Challenger Macrura, PI. XC, fig. ifi). In a full-grown, ova-bearing female, long 80 mm., of Saó. septemcarinata (Sabine) from the Barents Sea, which was examined by me, the exopodite of the ist pleopod proved to be 9 mm. long, the endopodite 5,2 mm., so that the latter was comparatively shorter than in Saó. indicci\ the endopodite, 1 mm. broad, much resembled that of this species, but the distal extremity decidedly narrows to the obtuse tip, so that the latter is not broadly rounded. The two branches of the 2nd pleopod are of the same length, but the inner appears in the middle a little less broad ; they have the usual lanceolate form, narrowing distally, and both margins are fringed with feathered, articulated setae: the stylamblys (Fig. 75/', 75/) measures nearly one-third the length of the inner branch, which is 3,4-times as long as broad 3o8 (the outer branch 3-times), and the stylamblys, which is 5-times as long as thick, is armed at the inner side of its obtuse extremity with about 20 cincinnuli, while 6 or 7 feathered setae are implanted on the inner margin, the outer being glabrous; the inner border of the protopod, finally, is also fringed with long, feathered setae which are not articulated. In the following pleopods the branches gradually diminish in breadth and the stylamblys in length. Prionocrangon W.-Mas. The remarkable genus Prionocrangon W.-Mas. includes only three species, of which the first described, Prion. ommatósteres W.-Mas., occurs in the Bay of Bengal off the Ceylon coast and in the Andaman Sea, while a male was obtained by the "Siboga" east of the island of Saleyer and a female in the northern part of the Strait of Makassar. The second species, Prion. Dofleini Balss, is recorded from the Sagami Bay, Japan, while the third, Prion. pectinata Faxon, is found in the West-Indies, off Martinique. All the species occur in deep water. Prion. ommatósteres was taken by the "Siboga" at Stat. 88 at a depth of 711 fathoms, the greatest depth at which this genus has been observed; this species, however, was obtained off the Ceylon coast also between 200 and 350 fathoms. Key to the known species of the genus Prionocrangon W.-Mas. ax When the carapace is looked at from above, the rostrum appears much shorter than the transformed eyestalks. Telson considerably shorter than the uropods, abruptly contracted behind the middle. Carapacial carina with 8 teeth pectinata Faxon (W. FAXON, in: Buil. Mus. Compar. Zoology. Vol. XXX, Nu 3, 1896, p. 157, Plate II, figs. 4—7.) a„ When the carapace is looked at from above, the rostrum appears almost or just as long as the transformed eyestalks. bx Carapacial carina 6 — 8-toothed. Rostrum rather short onnuatosteres W.-Mas. ó3 Carapacial carina 10 — 12-toothed. Rostrum rather long Dofleini Balss (H. BALSS, Ostasiatische Decapoden. II. München 19 14, p. 71, fig. 42.) 1. Prionocrangon ommatósteres W.-Mas. PI. XXV, Fig. 76 — 76/. Prionocrangon ommatósteres J. Wood-Mason, in: Ann. Mag. Nat. Hist. 6t!l Ser., Vol. 8, Nov. 1891, p. 362. Prionocrangon ommatósteres A. Alcock & A. R. Anderson, in: Journal Asiatic Soc. Bengal, Vol. LXIII, Part II, N" 3, 1894, p. 152. Prionocrangon ommatósteres A. Alcock, A descript. Catal. Indian Deep-Sea Crustacea, Calcutta 1901, p. 123. Illustrations of the Zoology of the Investigator, Crustacea, PI. IX, fig. 4. 3°9 Stat. 88. June 20. o° 34.6 N., II9°8'.5E. Northern part of the Strait of Makassar. 1301 m. Bottom fine grey mud. 1 adult female, without eggs. Stat. 211. Sept. 25. 5°4o'.7S., I20°45'.s E. East of Saleyer Island. 115S m. Bottom coarse grey mud, superficial layer more liquid and brown. 1 adult male. It is with some doubt that these specimens are referred to Prion. ommatosteres, the first described of the three species of this genus, at present known. The figure 4 in the "Illustrations", however, seems to be inaccurate. According to Alcock's description of 1901 the median carina of the carapace extends to within a short distance of the posterior border, in the figure, however, to hardly beyond the middle; the telson should be scarcely as long as the 6th abdominal somite, in the figure it is not shorter than it; the 4* pair of legs, finally, are described as a good deal longer than the 5th pair, in the figure the latter are but little shorter. Both in Prion. pectinata Faxon from off Martinique and in Prion. Dofleini Balss trom Japan the eyepeduncles are present, transformed in Faxon's species "into a pair of closely apposed trihedral processes, with acute and somewhat divergent tips", in the latter in two tapering and pointed stalks, placed on either side of the rostrum and closely apposed ("als dünn zugespitzte Stiele dicht nebeneinander"). In the present specimens (Fig. j6a) one observes, like in Prion. pectinata (\V. Faxon, in: Buil. Mus. Comp. Zoology, Vol. XXX, N° 3, 1S96, PI. II, fi&- 5)i on either side of the rostrum a triangular process with acute tip, of which both the outer margin and the upper surface are a little concave, while the two inner borders are at their base probably contiguous, but they soon diverge, so that the apices are somewhat remote from one another. Different, however, from the west-indian species, in the present specimens the two processes are hardly longer than the rostrum, when the carapace is looked at from above. In the last description of Prion. ommatosteres, that of 1901, the eyestalks are apodictically said to be wanting or "represented by a pair of microscopic tubercles on the anterior edge of the exposed antenor somite". In the figure 4 of the "Illustrations" neither the described triangular process, the transformed eyestalk, nor the pointed stylocerite of our specimens are visible, but, the figure being apparently inaccurate, these two processes are perhaps omitted. Rostrum triangular, acuminate, obliquely ascendant; when looked at from above, the rostrum appears but little longer than broad at base, while its length proves to be in the male one-ninth, in the female on e-t en th the distance, in the middle line, between the tip and the posterior margin of the carapace, the rostrum being in both specimens 0,84 mm. long. The median carina is armed in the female with 6, in the male with 8 forwardly directed teeth and reaches in the former to the posterior fourth, in the latter about to the posterior fifth of the carapace; in the male the ist or anterior tooth is slightly larger than the rest and the 5th is very small, while the 6 others are equal, but the 5th tooth is perhaps damaged ; the distances between the tips of the three posterior teeth are a little longer than those between the others ; this is also the case in the female, but the ist tooth is here scarcely larger than the rest. Orbital spine small, acute, reaching not so far forward as the rostrum. Antero-lateral angle of the carapace spiniform, reaching farther forward than the rostrum and fringed with feathered setae as in Prion. Dofleini. The abdomen, vvhich is 3-times as long as the carapace, agrees with Fig. 4 of the "Illustrations", the lower margin of the 2nd pleura appears slightly concave in both specimens. Telson (Fig. ~/6ó) in both specimens a trifle longer than the 6th somite, abruptly contracted just in front of the middle; the upper surface is slightly concave from the posterior extremity almost to the anterior, the infero-lateral margins of the anterior widened part are slightly sinuate and the lateral parts of the telson are also concave, the concavity reaching from the middle of the widened part to the posterior extremity. The telson which is slightly curved longitudinally, appears a little shorter than the uropods when these are directed straight backward and when the terminal spines of the telson are not included ; when these spines are included, it appears in the female just as long as the uropods, in the male not yet. The tip (Fig. 76c) of the telson, which is rounded though with a small acute spine in the middle, is namely armed with four slender spines of equal length, that are 0,8 mm. long, nearly one-sixth the length of the telson; one observes more- over on the lateral margins of the upper surface three pairs of very small spinules, the anterior pair just in front of the contraction, the 2nd a little farther from the anterior pair than from the tip, the 3ld pair, finally, on the posterior extremities of these margins, so that the tip is, properly speaking, armed at either side with three spines, two of which are very long, the third very small. The telson of Prion. pectinata Faxon is much shorter with regard to the uropods, broader in proportion to its length and contracted behind the middle, the telson of the third species, Prion. Doflcini, finally, has not been described. In the male the antennular peduncle, measured from the orbital margin, appears nearly as long as the carapace, rostrum included and measured in the middle line, though not longer; in the female it measures only three-fourths the length of the carapace. The ist joint is more than 3-times as long as the 2nd and 3rd taken together, the 2nd slightly longer than the 3rd ; the outer flagellum is in the male nearly as long as the peduncle, though not shorter and thicker than in the female, in which more than half the length is broken off ; the much thinner, inner flagellum measures in the male about two-thirds the outer. Stylocerite acute, reaching as far forward as the spiniform antero-lateral angle of the carapace. The antennal peduncle extends in the male to the distal extremity of the 2nd antennular article, in the female to the middle of 3rd ; the long and narrow scale reaches in the male just beyond the far end of the ist antennular article, in the female to that of 2nd and measures in the male two-thirds the length of the carapace, while in the female it is little more than halt that length. The external maxillipeds reach in the male to the middle of 3rd antennular article, but in the female by half their terminal joint beyond the antennular peduncle; exopodite small, hardly reaching to the middle of the antepenultimate joint. The ist pair of legs, the dactylus excluded, extend in the male (Fig. j6d) to the far end of ist antennular article, in the female almost to that of 2nd, appearing in both as long as the antennal scale. The stout 2nd legs (Fig. 76 c) reach in both specimens to the middle of the propodus of the ist pair and to the middle of the antennal scale, the slender 3rd legs (Fig. 76/) are as long as the external maxillipeds both in the male and the female, the streng legs of the 4th pair (Fig. "]6g) reach to the tip of the propodus of the ibt, the legs, finally, of the 5"1 1 1 pair (Fig. 76/1, 762), that are considerably shorter, reach just beyond the far end of the merus of the 4"1 and to the distal extremity of the carpus of the 2nd. In the ist pair of pleopods of the male the endopodite is rudimentary, measuring only one-fourth the length of the exopodite ; in the five following pairs the endopodite measures three- fourths the length of the outer branch, it is much less broad and bears in the 2nd pair a well- developed, styliform appendix masculina with 4 stout setae at the tip. In the ist pair of pleopods of the female the endopodite is also rudimentary, in the three following it measures a little more than one-fourth and in the 5"1 pair nearly half the length of the exopodite. The male is 30 mm. long, measured in the middle line from the apex of the rostrum to the tip of the telson, the terminal spines excluded, carapace 7,2 mm., abdomen 22,8 mm.; in the female these numbers are 36 mm., 8,3 mm. and 27,7 mm. General distribution: Andaman Sea (Alcock) ; Bay of Bengal off the Ceylon coast (Alcock). INDEX Note. — Synonyms are printed in Italics. The more important pages are indicated by heavier type. abyssi (Pontophilus) 252. 258. 259. 264 — 266. 271. abyssorum (Crangon) 249. Acanthephyra 41 — 43. 53. acanthonotus (Plesionika) 105. 111. acclivis (Crangon) 249. aculeata (Glyphocrangon) 212. 214. 216. aculeocaudata (Leptochela) 4. 18. 26. acuminata (Glyphocrangon) 212. 214. 217.225.227. acutifrons (Acanthephyra) 43. 54. acutifrons (Acanthephyra) 66. acutifrons Bate (Pasiphaea) 1. 2. 6. acutifrons Dofiein and Balss (Pasiphaea) 2. 6. Adensameri (Parapandalus) 107. 138. 139. Aegeon 24S. 249. 254. 2()0- 292. aequimana (Processa) 198. 203. afïïne (Aegeon) 294. aftïnis (Aegeon) 294. aftïnis (Crangon) 249. aftïnis Faxon (Heterocarpus) 108. 153. 173. aftïnis Borr. (Heterocarpus) 108. 153. 156. aftïnis (Pasiphaea) 2. 6. affinis (Plesionika) 129. aftïnis (Systellaspis) 43. 51. aftïnis (Thalassocaris) 94. Agassizi (Acanthephyra) 45. Agassizii (Miersia) 41. Agassizii (Nematocarcinus) 74. alaskensis (Argis) 255. alaskensis (Crangon) 249. alaskensis elongata (Crangon) 249. alata (Glyphocrangon) 212. 214. 216. alata (Sclerocrangon) 251. alba (Crangon) 249. Alcocki (Pasiphaea) 2. 6. Alcocki (Plesionika) 105. 112. 113. aleutica (Pandalopsis) 104. Alexandri (Heterocarpus) 108. 153. 154. Allmanni (Crangon) 249. Alphonsi (Heterocarpus) 108. 153. 156. 171. 176. altus (Nematocarcinus) 74. Amarynthis (Stylodactylus) 31. 32. 39. 40. americana (Pasiphaea) 2. 6. 14. americanum (Gnathophyllum) 187. 1S8. 191. ampla (Pandalopsis) 101. 104. amplidens (Pasiphaea) 2. 6. andamanensis (Aegeon) 254. 291. 294. angusta (Acanthephyra) 44. 56. angusticauda (Sclerocrangon) 251. angusticauda var. dentata (Sclerocrangon) 251. angustirostris (Pontophilus) 252. 258. 263.279. 283 — 285. annectens (Sympasiphaea) 4. antarcticus (Notocrangon) 251. antarcticus var. gracilis (Notocrangon) 251. approxima Bate (Acanthephyra) 43. 54. approxima Faxon (Acanthephyra) 43. 54. areolata (Paracrangon) 257. Argis 248. 255. armata (Acanthephyra) 43. 53. 54. 6l. armata var. fimbriata (Acanthephyra) 43. 54. 61 — 64. assimilis (Glyphocrangon) 213. 214. 217. 226. 227- assimilis (Plesionika) 105. 112. 115. 131. Athanas 97. atlanticus (Notostomus) 46. atrox (Sclerocrangon) 251. australiensis (Processa) 198. 199. australis (Pontophilus) 252. 258. 260. Batei Faxon (Acanthephyra) 41. 44. 54. 63. 69 — 71. Bat ei Stebbing (Acanthephyra) 45. 61. Bellmarleyi (Sclerocrangon) 251. Benedicti (Ephyrina) 46. bengalensis (Aegeon) 254. 291. 294. 13 bidentatus (Pontophilus) 252. 258. 260. bifurca (Plesionika) 105. III. 112. 115. 136. bifurca (Plesionika) (Pandalus) 136. bimaxillaris (Stylodactylus) 31. 32 — 36. binoculus (Nothocaris) 1 34. binoculus (Plesionika) 105. til. 112. 115. 131 — 134. bispinosus (Pontophilus) 252. 253. 25S. 261. Bonnieri (Dichelopandalus) 105. borealis (Pandalus) 103. boreas (Sclerocrangon) 251. Bouvier i (Systellaspis) 43. 53. brachytelsonis (Acanthephyra) 55. Braueri (Acanthephyra) 44. 54. brevirostris (Acanthephyra) 41. 42. 44. 45. 53- 55.69. brevirostris (Hoplophorus) 42. 50. brevirostris (Notostomus) 46. brevirostris (Oplophorus) 48. brevirostris (Pandalina) 104. brevirostris (Plesionika) 105. 112. 113. brevirostris (Pontophilus) 252. 258. 259. brevis (Plesionika) 105. 112 — 114. caeca (Plastocrangon) (Glyphocrangon) 213. 214. 220. 241. 245. 246. caecescens (Plastocrangon) (Glyphocrangon) 213.214. 220. 243. californiensis (Argis) 255. canaliculata (Processa) 194. 197 — 199. 202. 208 — 210. candidus (Pontophilus) 252. 258. 261. 262. 274. capensis (Crangon) 249. capreensis (Plesionika) 106. ui. 113. Caridina 38. carinata (Acanthephyra) 44. 54. carinata (Leptochela) 4. 19. 26. carinatus (Heterocarpus) 109. 152. carinatus (Pandalus) 167. carinicauda (Pontophilus) 252. 25S. 262. cassiope (Crangon) 250. cataphracta (Aegeon) 255. 291. 292. Caudani (Dantecia) 4. ceratophthalma (Phyllognathia) 188. cerea (Plastocrangon) (Glyphocrangon) 213. 214. 220. Challengeri (Pontophilus) 249. 252. 258 — 260. 264. Chiltoni (Pontophilus) 252. 258. 260. Chlorotocella ior. 102. 110. 180. Chlorotocus 101. 102. 110. 181. communis (Crangon) 250. compta (Parapasiphaë) 3. consobrina (Crangon) 250. Coralliocrangon 247. 248. 257. corteziana (Pasipha^a) 2. 6. Cottei (Parapandalus) 107. 138. 139. Couchii (Processa) 197. 199. Coutierei (Processa) 198. 199. SIBOGA-EXPED1T1E XXXIX o-1. Crangon 248. 249. crangon (Crangon) 250. 305. crangon var. (Crangon) 249. 250. crangon var. Schidlowskii (Crangon) 250. Crangonidae 247. Crangonoida 187. crangonoides (Naushonia) 247. 257. crassa (Argis) 255. crassicornis (Chlorotocus) 110. 181 — 183. crassicornis var. andamanensis (Chlorotocus) 110. 181. 182. crassicornis (Pandalus) 181. crassus (Gonatonotus) 47. crinita (Thalassocaris) 94. 95. 100. crinita var. ? (Thalassocaris) 95. ÏOO. crinitus (Regulus) 95. cristata (Parapasiphaë) 3. cristata (Pasiphsa) 2. 6. 14. 16. cristata (Systellaspis) 43. 51. cucullata (Acanthephyra) 44. 54. cursor (Nematocarcinus) 72. 73. 75. 84. 86 — 88. cursor var. paucidentatus (Nematocarcinus) 83. curtirostris (Acanthephyra) 43. 44. 53. 54. 66. Dalli (Crangon) 250. Danae (Nikoides) 192 — 196. Danae (Pandalus) 103. Danae (Thalassocaris) 94. 95. Dantecia 1. 4. dapifer (Pandalus) 103. debilis (Acanthephyra) 51. debilis (Systellaspis) 42. 43. 50. 51. 64. debilis var. indica (Systellaspis) 43. 51. dentata (Argis) 256. Dichelopandalus 100 — 102. 105. discissipes (Stylodactylus) 31. 32. dispar (Pandalopsis) 105. dispar var. japonica (Pandalopsis) 105. Dofleini (Prionocrangon) 257. 30S — 310. Dorodotes 101. 102. 108. 151. dorsalis (Heterocarpus) 109. 153. 156. 171. duplex (Hymenodora) 44. 69. echinata (Paracrangon) 257. echinulatus (Pontophilus) 252. 258. 259. 263. echinurus (Systellaspis) 43. 51. edulis (Nika) 197. Edwardsii (Acanthephyra) 44. elegans (Gnathophyllum) 187 — -189. elegans var. brevirostris (Gnathophyllum) 187. 188. elegans var. rectirostris (Gnathophyllum) 188. elegans (Hymenocera) 188. ïgi. elegans (Notostomus) 46. emarginata (Pasiphasa) 2. 6. 40 3i4 ensifer (Heterocarpus) 109. 152 — 155. 167. 169. 170. .-8. ensifer var. parvispina (Heterocarpus) 109. 152. 153. 156. 167. ensifer (Nematocarcinus) 72 — 75. yy. ensifer var. exilis (Nematocarcinus) 73 — 75. 78. ensifer var. producta (Nematocarcinus) y^ — 76. So. 87. ensifer var. tenuipes (Nematocarcinus) 73-75.77.78. ensis (Plesionika) 106. ui — 114. Ephyrina 41. 42. 46. escatilis (Pandalus) 151. escatilis (Parapandalus) 107. 138. 140. 151. exigua (Plesionika) 106. 111. 112. 115. 131. 132. 134- exiguus (Pandalus) 111. eximea (Acanthephyra) 44. 53. eximea var. brachytelsonis (Acanthephyra) 44. 53. 55- falcïpes (Pandalus) 105. fasciatus (Pontophilus) 252. 257. 258. 262. fasciolatum (Gnathophyllum) 187 — 189. Faxoni (Pasiphasa) 2. 6. Faxoni (Plastocrangon) (Glyphocrangon) 213. 214. 220. 243. ferox (Sclerocrangon) 251. flagellata (Pasiphsea) 2. 6. 14. Flindersi (Pontophilus) 253. 258. 259. 261. foliaceus (Hoplophorus) 42. 47. 48. forceps (Pasiphsea) 2. 6. Forsten (Aptenodytes) 6. fragilis (Notostomus) 46. fragilis (Psathyrocaris) 4. 17. fragilis var. atlantica (Psathyrocaris) 1. 4. 17. Franciscorum (Crangon) 250. Franciscorum angustimana (Crangon) 250. franciscorum (Pandalus) 103. frontalis (Hymenodora) 46. geniculata (Plesionika) 106. in. 113. gibbosa (Vercoia) 257. gibbosus (Heterocarpus) 109. 153. 155. 159 — 161. 163. 165. 166. gibbosus (Notostomus) 46. Gigliolii (Plesionika) 106. 111. Gilesii (Glyphocrangon) 213. 214. 218. 227 — 229. Gilesii (Parapasiphae) 3. glacialis (Hymenodora) 46. glauca (Hymenodora) 47. Glyphocrangon 214. Glyphocrangonidae 212. Gnathophyllidae 187. Gnathophyllum 187. 188. Gonatonotus 41. 42. 47. goniurus (Pandalus) 103. gracilipcs (Chlorotocus) 181. gracilipes (Nematocarcinus) yt,- 75- gracilirostris (Hoplophorus) 42. 47. 48. 50. gracilis (Acanthephyra) 43. gracilis (Chlorotocella) 110. l8o- gracilis (Leptochela) 5. iS. 21. 27. gracilis (Nematocarcinus) 73 — 75. go. gracilis (Pandalus) 103. gracilis (Plesionika) 106. 112. 114. gracilis (Pontophilus) 253. 258. 260. 264 — 269. gracilis (Processa) 198. 199. granulosis (Glyphocrangon) 212 — 214. 218. 230. Grimaldii (Heterocarpus) 109. 153. 154. 166. Grimaldii (Hoplophorus) 42. 47. 48. Gurncyi (Pandalus) 103. Habereri (Aegeon) 255. 291. 293. Haeckelii (Acanthephyra) 45. Hakodatei (Crangon) 250. hastacauda (Glyphocrangon) 212 — 214. 217. 224. 225 — 227. hawaiensis (Processa) 19S. 199, hawaiiensis (Psathyrocaris) 4. 17. Hendersoni (Pontophilus) 253. 258. 259. 262. Heterocarpoides 102. 110. 178. Heterocarpus 101. 102. 108. 152. heterocarpus (Plesionika) 106. 111. 131. hiatus (Nematocarcinus) 74. 75. hilarula (Pasipha;a) 10. 14. Holmesi (Crangon) 250. Hoplophoridae 41. Hoplophoroida 41. Hoplophorus 41. 42. 47. Hoskynii (Ephyrina) 46. hostilis (Heterocarpus) 109. 153. 154. 173. Huxleyi (Psalidopus) 185. Hymenocera 188. 191. Hymenodora 41. 42. 46. hypanodon (Plesionika) 106. 112. 114. hypsinotus (Pandalus) 103. 104. hypsinotus var. meridionalis (Pandalus) 103. 104. hystrix (Sabinea) 256. 302. 303. incertus (Chlorotocus) 110. 181 — 183. incisus (Pontophilus) 253. 258. 259. 263. 278 — 281. 284. indica (Sabinea) 256. 302. 303. infirma (Psathyrocaris) 4. 17. intermedia (Sclerocrangon) 251. intermedia var. bidentata (Sclerocrangon) 252. intermedius (Nematocarcinus) 74. y6. intermedius (Pontophilus) 253. 258. 261. Investigatoris (Glyphocrangon) 212 — 214. 217. 220. 222. .15 Investigatoris var. andamanensis (Glyphocrangon) 212. 214. 217. 220. 223. Jacqueti (Sclerocrangon) 252. japonica (Nica) 208. japonica (Nika) 208. 209. japonica (Processa) 198. 199. 208. japonicus (Notostomus) 46. japonicus (Pontophilus) 253. 258. 263. 286. Jordani (Pandalus) 103. junceus (Pontophilus) 249. 253. 258. 260. 264. kaiwiensis (Pasiphaea) 2. 6. 13. 14. Kempii (Acanthephyra) 44. 54. Kempii (Pontophilus) 253. 258. 263. 275. 283. Kessleri (Pandalus) 103. 104. Kingsleyi (Acanthephyra) 45. 54. Lacazei (Aegeon) 255. 291. 293. laevigatus (Heterocarpus) 109. 153. 154. 159- I(^5- 166. 173. laevis (Heterocarpus) 109. 153. 160. 164. 166. lamelligera (Pandalopsis) 105. lanceocaudata (Systellaspis) 43. 50. 51. lanceopes (Nematocarcinus) 74. j6. lar (Argis) 256. latirostris (Pandalus) 103. 104. latirostris (Parapasiphaë) 3. Latreillii (Hymenocera) 188. 191. 192. lepidus (Heterocarpus) 109. 153. 155. 164. leptocerus (Dichelopandalus) 105. Leptochela 1. 4. 18. leptorhynchus (Pandalus) 103. levicarina (Dorodotes) 17S. levicarina (Heterocarpoides) 110. 178. levicarina (Heterocarpoides) (Heterocarpus) 178. levior (Argis) 256. Lockingtonii (Crangon) 250. longicarpus (Pandalus) 106. longicauda (Parapandalus) 107. 138. 140. longidens (Acanthephyra) 45. longipes (Pandalus) 121. longipes (Plesionika) 106. ui. 114. 121. 124. longipes var. indica (Plesionika) 106. 112. 114. 121. longirostris (S. I. Smith) (Glyphocrangon) 212 — 214. 217. 227. 230. 238. 239. 241. longirostris Mac Gilchrist (Glyphocrangon) 213. 214. 230. longirostris (Heterocarpus) 109. 153 — 155. longirostris (Hoplophorus) 42. 47. 48. 50. longirostris (Nematocarcinus) 72. 74. 76. longirostris (Notostomus) 46. longirostris (Pandalopsis) 105. longirostris (Plesionika) 106. 112. 114. longispina (Pasiphaea). 2. 6. loricata (Glyphocrangon) 212. 214. 216. Lovvisi (Pontophilus) 253. 258. 259. 263. 289. lucida (Thalassocaris) 94. 95. 97. macrognatha (Nica) 199. 200. macrognatha (Processa) 197 — 199. maculosa (Crangon) 250. magna Faxon (Pasiphaea) 2. 6. magna Rathb. (Pasiphaea) 2. 6. magnoculus (Pandalus) 103. maldivensis (Nikoides) 192. 193. maldivensis (Thalassocaris) 94. 95. martia (Plesionika) 106. 111 — 114. 116. 117. 119. 138. martia var. semilaevis (Plesionika) 106. 111 — 113. Il6. 149. martius (Pandalus) 116. martius (Plesionika) (Pandalus) 116. media (Acanthephyra) 42. 45. 54. 64. media (Aegeon) 297. media var. obliquirostris (Acanthephyra) 45. 54. 64. media (Pontocaris) 296. mediterranea (Processa) 197. medium (Aegeon) 296. megalocheir (Pontophilus) 253. 258. 262. megalophthalma (Glyphocrangon) 213. 215. 219.237. Meningodora 41. 54. microphthalma (Acanthephyra) 45. 53 — 55. miles (Parapandalus) 107. 138. 140. Mitsukurii (Pandalopsis) 105. modestus (Pandalus) 103. modestus (Pontophilus) 253. 258. 261. 262. 274. modumanuensis (Pontophilus) 253. 258. 261. 270- mollicutis (Hymenodora) 47. mollis (Acanthephyra) 45. mollis (Hymenodora) 69. mollis (Meningodora) 41. mollis (Meningodora) (Acanthephyra) 54. Montagui (Pandalus) 103. 140. Montagui tridens (Pandalus) 104. multidentata (Pasiphaea) 2. 6. munita (Slerocrangon) 252. munitella (Crangon) 250. Murrayi (Notostomus) 46. narwal (Pandalus) 107. Narwal (Parapandalus) 107. 13S — 140. Naushonia 247. 248. 257. neglecta (Glyphocrangon) 212. 215. 219. neglectus (Pontophilus) 253. 258. 261. 262. Nematocarcinidae 72. Nematocarcinus 72. nigricauda (Crangon) 250. ?, i6 nigromaculata (Crangon) 250. Nikoides 192. nobilis (Glyphocrangon) 212. 215. 217. 225. 227. 230. 238. 240. norvegicus (Pontophilus) 253. 257. 259. Nothocaris 105. 111. Notocrangon 248. 251. Notostomus 41. 42. 46. Novae-Zealandiae (Chlorotocus) 1 10. 181. 1S2. n. sp,? (Pasiphaea) 3. 13. obliquus (Pontophilus) 253. 258. 259. 261. obsoleta ( ' Aegeon) 296. obsoletum (Aegeon) 291. 294. occidentalis (Pontophilus) 253. 25S. 259. 264. 271. occidentalis var. indica (Pontophilus) 254. 258. 260. 264. ocellus (Plesionika) (Pandalus) 126. ocellus (Plesionika) 107. 112. 115. 127. 128. ocellus var. subtilirostris (Plesionika) 107. iii. ommatosteres (Prionocrangon) 257. 308. Oplophorus 47. orientalis (Aegeon) 255. 291. 293. 300. 301. orientalis (Crangon) 250. orientalis (Egeon) 300. orientalis (Stylodactylus) 31. 32. Orphania 1. 4. Ortmanni (Plesionika) 107. 112. 114. 117. 124. oryx (Heterocarpus) 109. 153. ovifer (Argis) 256. pacifica (Pandalopsis) 105. pacifica (Pasiphasa) 2. 6. pallidum (Gnathophyllum) 188. 191. panamense (Gnathophyllum) 187 — 189. Pandalidae 100. Pandalina 100 — 102. 104. Pandaloida 94. Pandalopsis 101. 102. 104. Pandalus 97. 100 — 102. 103. Pantomus 101. 102. 108. Paracrangon 248. 257- Parapandalus 101. 102. 107. 138. Parapasiphaë 1. 3. Parapenaeus 265. Parfaiti (Pandalus) 111. Parfaiti (Plesionika) 107. 111. 113. parva (Acanthephyra) 45. 57. 58. 60. parva multidens (Acanthephyra) 60. parva paucidens (Acanthephyra) 58 — 60. parvidentatus (Nematocarcinus) 74. j6. parvirostris (Pontophilus) 254. 25S. 262. parvulus (Pantomus) 101. 108. Pasiphaea 1. 5. 22. Pasiphaeidae 1. Pasiphiuoida 1. patentissimus (Notostomus) 46. Pattersonii (Pontophilus) 254. 25S. 260. paucidentatus (Nematocarcinus) 76. 83. 86. 90. paucidens (Pandalus) 104. pectinata (Prionocrangon) 257. 308 — 310. pennata (Aegeon) 249. 255. 291. 292.294. 297 — 300. pennata var. aflïnis (Aegeon) 255. 291. 292. 294. 29S. 299. pennata (Pontocaris) 294. Peripandalus 101. 102. 104. perlatus (Notostomus) 46. Perrieri (Coralliocrangon) 257. Phye 5. Phyllognathia 188. picta (Hymenocera) 1S8. 191. pilosus (Pontophilus) 254. 258. 259. Plastocrangon 213. 220. platyceros (Pandalus) 103. 104. platyophthalmus (Psathyrocaris) 4. 17. platyura (Processa) 198. 199. plebs (Pontophilus) 254. 258. 259. 261. 274. Plesionika 101. 102. 105. 111. plumosa (Psathyrocaris) 4. 17. podager (Glyphocrangon) 212. 215. 218. pontica (Nikoides) 192. 193. Pontophilus 248. 249. 252. 257. 307. prensor (Pandalus) 104. princeps (Pasipha;a) 2. 6. principalis (Pasiphaea) 2. 5. 7. Prionocrangon 248. 249. 257. 308. priononota (Glyphocrangon) 213. 215. 218.231.232. pristis (Pandalus) 146. 149. pristis (Parapandalus) 107. 108. 138. 139. 141. 150. procax (Sclerocrangon) 252. Processa 192. 197. processa (Processa) 198. 199. 204 — 207. Processidae 192. productus (Nematocarcinus) 76. profundus (Pontophilus) 254. 258. 260. 264'. propensalata (Aegeon) 249. 255.291.292.296 — 298. propensalata var. hilarula (Aegeon) 255. 293. 296- propensalata (Pontocarisj 296. propinqua (Pasiphaea) 3. 6. 7. 10. propinquus (Crangon) 250. propinquus (Pandalus) 104. proximatus (Nematocarcinus) 72. 74. 76. Psalidopodidae 185. Psalidopodoida 185. Psalidopus 185. Psathyrocaris 1. 4. 17. pubescentulus (Pandalus) 104. pugnax (Glyphocrangon) 213. 215. 217. 225. pugnax (Leptochcla) 5. 18. 26. 30. pulchra (Acanthephyra) 45. 54. purpurea (Acanthephyra) 41. 45. 51. 53 — 55. 57. purpurca var. acanthitelsonis (Acanthephyra) 45. 54. purpurea var. multispina 1 Acanthephyra) 61. quadridentata (Plesionika) 107. 111. quadridentatus (Pandalus) 111. Rathbunae (Pasiphsa) 3. 6. Rathbuni (Aegeon) 255. 291. 294. 300. rectirostris (Acanthephyra) 45. rectirostris (Stylodactylus) 31. 32. reflexus (Dorodotes) ioS. 152. 178. regalis (Glyphocrangon) 212. 21 3. 21 5. 2 17. 220. 223. 224. 229. regalis var.? (Glyphocrangon) 223. resima (Crangon) 250. Rhynchocinetes 101. Richardi (Parapandalus) 108. 138. 140. rimapes (Glyphocrangon) 212. 213. 215. 218. robusta Bate (Leptochela) 5. 18. 29. robusta Stimps. (Leptochela) 1. 4. 5. 18. 19. 26 — 30. robustus (Notostomus) 46. robustus (Pandalus) 103. 104. rostrata (Acanthephyra) 41. 45. 69. rostrata (Meningodora) (Aanthephyra) 54. rostricrescentis (NotJiocaris) 107. rostricrescentis (Plesionika) 107. m. 112. 115. 131 — '33- rugulosa (Aegeon) 255. 291. 293. Sabinea 248. 249. 256. 302. sabsechota (Pontophilus) 254. 258. 259. 262. sagamiensis (Crangon) 250. sagittarius (Panda lus) 106. salebrosa (Sclerocrangon) 252. sanguinea (Acanthephyra) 45. 53. 54. 61. Sarsii (Sabinea) 256. 302. 303. Sclerocrangon 248. 251. Scotiae (Pasipha:a) 3. 6. sculpta (Glyphocrangon) 212. 213. 215. 218. sculptus (Pontophilus) 254. 257. 258. 263. 279. 281. semilaevis (Plesionika) 116. 119. septemcarinata (Sabinea) 256. 302. 303. 307. septemspinosa (Crangon) 250. serrata (Parapasiphaë) 3. serratifrons (Parapandalus) 108. 139. 141. 146. serratifrons (Parapandalus) (Pandalus) 146. serratorbita (Leptochela) 5. 18. 22. 23. serratus (Nematocarcinus) 74. 76. serratus (Peripandalus) 101. 104. serratus (Stylodactylus) 31. 32. Sharpi (Sclerocrangon) 252. Sibogae (Acanthephyra) 41. 46. 54. Sibogae (Meningodora) (Acanthephyra) 54. 69. Sibogae (Aegeon) 255. 290. 291. 293. 298. Sibogae var. intermedia (Aegeon) 255. 291. 293. 300. Sibogae (Glyphocrangon) 213. 215. 219. 233. 239 — 241. Sibogae (Heterocarpus) 109. 153. 156. 167 — 169. Sibogae (Nikoides) 192. 193. Sibogae (Stylodactylus) 31. 32. 38. sica [Acanthephyra) 45. sicaria (Glyphocrangon) 212. 215.219.233.234.237. sicula (Pasipha;a) 3. 5. signatus (Heterocarpus) 109. 153 — 155. Sindoi (Pandalus) 126. Sindoi (Plesionika) 107. 112. 114. 126. sinuolata (Processa) 197. 199. Sivado (Pasiphsea) 3. 5 — 8. 9. ii. Smithii (Glyphocrangon) 213. 215. 216. sp. (Acanthephyra) 68. sp. (amarynthis) (Stylodactylus) 32. sp. (Gnathophyllum) 187. sp. (Leptochela) 30. sp. x (Pasiphaea) 3. g. sp. ;3 (Pasipha;a) 3. 11. sp. de Man (Processa) 198. 199. 203- sp. Stebbing (Processa) 199. spinicauda (Chlorotocus) 96. 1 10. 181. 182. spinicauda (Glyphocrangon) 212. 215. 219. 230.232. spinicauda (Hoplophorus) 42. 47. 48. spinidorsalis (Pandalus) 111. spinidorsalis (Plesionika) 107. 112. 115. spinipes (Parapandalus) 108. 138. 140. 142. 147. 148. 150. spinipes (Parapandalus) (Pandalus) 142. spinipes var. grandis (Parapandalus) 142. spinipes (Plesionika) 142. 144. spinipes var. grandis (Plesionika) 142. 145. spinirostris (Crangon) 250. spiniserrata (Plesionika) 107. III. 112. spiniventris (Psalidopus) 185. spinosissima (Crangon) 250. spinosus (Pontophilus) 254. 257. 258. 263. spinulosa (Glyphocrangon) 212. 215. 218. stenolepis (Pandalus) 104. Stimpsoni (Pandalus) 104. Stimpsoni (Thalassocaris) 94. Stochasmus 72. stylirostris (Crangon) 250. Stylodactylidae 31. Stylodactyloida 31. Stylodactylus 31. Stylopandalus 138. stylopus (Parapandalus) 108. 138. 140. sulcatifrons (Parapasiphaë) 4. 3i8 Sympasiphaea i. 4. Systellaspis 41 — 43. 50. tarda (Pasiphaea) 2. 3. 5. tenuimana (Orphania) 4. tenuipes (Acanthephyra) 46. 54. 68. tenuipes (Pandalus) 111. tenuipes (Parapandalus) 108. 139. 149. tenuipes [Parapandalus) (Pandalus) 146. tenuipes (S. I. Smith) (Plesionika) 107. III. tenuipes (A. M.-Edw.) (Plesionika) 107. tenuirostris (Nematocarcinus) 74. ?6. 79. tenuirostris var. Sibogae (Nematocarcinus) 74. 76. 79. 87. Thalassocaridae 94. Thalassocaris 94. 18 1. tricarinatus (Heterocarpus) 110. 153 — 155. l6l. 164 — 166. tridcns (Gnathophyllum) 187 — 189. trispinosus (Pontophilus) 254. 257. 258. 262. 274. truncata (Pasiphaea) 3. 6. typus (Hoplophorus) 42. 47. 48. typus (Oplophorus) 48. undulatipes (Nematocarcinus) j^. 74. j6. 83. 90 — 92. unguiculata (Glyphocrangon) 213. 215. 217. 225. unicarinatus (Heterocarpus) 1 10. 153. 154. unidens (Plesionika) 107. III. 112. 115. 129. unidens (Plesionika) (Pandalus) 129. uniproducta (Plesionika) 107. 112. unispinosa (Pasiphaea) 3. 6. Valdiviae (Acanthephyra) 46. 54. variabilis (Crangon) 251. Vercoia 248. 257. vescus (Notostomus) 46. vicaria (Glyphocrangon) 212. 215. 219. 238. 240. 241. vicarius (Heterocarpus) 110. 153 — 155. 162. victoriensis (Pontophilus) 254. 258. 259. 263. Westergreni (Notostomus) 46. Wood-masoni (Heterocarpus) 110. 153. 154.156. 178. zebra (Gnathophyllum) 188. 189. 191. Zur Strasseni (Parapandalus) 108. 138. 139. 141. EXPLANATION OF THE PLATES. PLATE 1. Fig. i — ij. Pasipluea propinqua de Man. Type from Stat. ioo. — i lateral view of carapace, etc. X 4; la lateral view of anterior part of carapace, X lij ib anterior part of carapace, X II; lc front and outer orbital angles, X 17; ld anterior part of carapace, with the eyes, antennulae and scaphocerites, X4; ie posterior part of abdomen, X 3; 1 ƒ caudal fan, X4; ij" extremity of telson, X 33 (only the fragments of three terminal spines are still present); ik leg of ist pair, X4; 1* leg of 5th pair, X4; ij dactylus of this leg, X T7- Fig. 2, 2a. Pasipluea Sivado (Risso). Adult specimen from Nizza. — 2 front and outer orbital angles, X 17; 2 a tip of telson, X 33- Fig. 3 — 30. Pasiphcca sp. #., young specimen from Stat. 148. — 3 front, outer orbital angles and post- frontal spine, looked at from above, X 50 ; 30 anterior part of carapace, lateral view, X 33 ; 3$ posterior part of abdomen, X 17; 3<" telson, X 33; ld extremity of telson, X 100; 3* scaphocerite, X 25 ; 3/ left leg of i$t pair, X 17; 3g right leg of 2"J pair, X 17; 3^ spine on the basipodite of this leg, X66; 3/ spine of the merus of 2nd leg, X 66; 3/ right leg of 3'd pair, X 17; 3>è dactylus of this leg, X66; 3/ leg of 4* pair, X 33; 3'« dactylus of this leg, X66; 3« right leg of 5t:ï pair, X 17; 30 dactylus of this leg, X 66. Fig. 4 — 4^. Pasiphaa sp. /3. Specimen, probably young, from Stat. 105. — 4 anterior part of carapace, with the eyes, antennular peduncles and right scaphocerite, X 33; Aa front and outer orbital angles, X 66; ^b lateral view of anterior part of carapace, X 50; 4c extremity of telson, X 66; ófd left scaphocerite, X 33; \e the two last joints of 3rd outer maxilliped, X 33; Af leg of ist pair, X 20; 4^ carpus of this leg, X 50. Siboga-ExpediHe XXXIXa' J G. de Man. Caridae J. G. de Man, del. PLATE II. Fig Fig. 4/1 — 4p. Pasiphtca sp. /3. Specimen, probably young, from Stat. 105. — 4/1 leg of 2nd pair, X 20 ; 41 carpus of 2nd leg, X 50; 47' leg of 3rd pair, X 33; 4<£ dactylus of this leg, X66; 4/ leg of 4th pair, X 33; 4'« propodus and dactylus of this leg, X66; 411 one of the spines of the propodus of this leg, X 20O ; 40 leg of 5th pair, X33; 4p dactylus of this leg, X 66. 5 — 5j. Pasipluea n. sp. ? Specimen, probably young, from Stat. 141. — 5 lateral view of carapace, eye, antennula and antenna, X II; Sa posterior part of abdomen, X6; 5$ left scaphocerite, X 17; Sc le& °f ist Pa'r> X6; $d part of the merus of this leg with the only tooth, X 33; 5 e leg of 2nd pair, >(6; 5/ leg of 31'<1 pair, X6; $g leg of 4t!l pair, as far as present, X6; $h leg of 5th pair, X6; $i dactylus of this leg, X 33; 57 extremity of telson, X 33- 61. Pasiphcea kaiwiensis Rathb. Female from Stat. 316. — 6 front and outer orbital angles, X 17; 6a lateral view of the anterior part of carapace, eye etc, X il; 6b the same seen from above, X 4; 6c posterior part of abdomen, X 3; 6d extremity of telson, X 33; 6e left scaphocerite, X6; 6 f leg of ist pair, ><6; 6g leg of 2nd pair, X6; 6/1 leg of 3>'d pair, X6; 6i leg of 4th pair, X'6; 6j dactylus of this leg, X33; 6/t leg of 5th pair, X6; 61 dactylus of this leg, X 33 (the setae are not figured). Fig. 6- Sïboga-Expeditie XXXIXa* J. G.de Man Caridae il. J. Q. de Man, dd. PLATE III. Fig. 7 — yj. Leptochela robusta Stimps. Excepting f x on Plate IV all the figures have been taken from an adult male or an adult, ova-bearing female captured at Stat. 153. — 7 anterior part of carapace, with the eyes and the two pairs of antennae of an adult male, X 17;, 7# rostrum of another specimen, X 17; jb lateral view of the same male, X 17; je carapace and eyes of an adult female, X II; jd posterior part of abdomen of this female, X 8; Je posterior part of 6* abdominal somite of this female, X 33 (the small spine on the lower surface, though partly covered by long feathered setae, is also visible) ; 7 f telson of this female, X 17; J g extremity of telson of this female, X 33; jh and j/i' right and left mandible of this female, X 33; ji palp of the right mandible of this female, X 33; jj hrst maxilla of this female, X 33- Sibocja-Expeditie XXXIXa? J. G. de Mar,. Caridae in 7' G. de .Wan PLATE IV. Fig. 7 k — 7 x. Leptochela robusla Stimps. Excepting J x all the figures have been taken from an adult ova- bearing female captured at Stat. 153. — jk second maxilla of this female, >( 17; 7I first maxilliped of this female, X 17; 7 '»■ endopodite of this first maxilliped, X 33; 7« second maxilliped of this female, X 17; 70 dactylus of this maxilliped, X33; 7P third maxilliped of this female, X U; 7q terminal joint of this maxilliped, X 25; 7;- carpus and chela of the right first leg of this female, X 17; 7 -f part of the fingers of this chela, on the level of the 5lh spinulc on the outer border of the dactylus, X 107; Jt carpus and chela of the right leg of the 2nd pair of this female, X '7; 7» right leg of the yd pair of this female, X 17; 7"V right leg of the 4* pair of this female, X 17; 7a1 right leg of the 5A pair of this female, X 17; jx lateral view of the anterior margin of carapace of the young male, long 13 mm., from Stat. 166, X 33- Fig. 8 — 8 d. Leptochela pugnax de Man. — 8 lateral view of the anterior part of carapace of the adult male from Stat. 47, X 50; Sa sixth abdominal somite and part of fifth, of this male, X 33 ; Sb the two last joints of the left third maxilliped of the ova-bearing female from Stat. 258, X 50; Sc right leg of the second pair of this female, X 33; Sd left leg of the third pair of this female, > ^. Siboga-Expeditie XXXIXa1? J. G. de Man. Caridae IV. J. G. de Man, del. i PLATE V. Fig. 9 — gh. Stylodactylus Amarynthis de Man. — 9 egg-bearing female from Stat. 204, X 6%; ga rostrum, X 20; gb pleura of the first to fourth abdominal somites of the left side, X 20, z carapace, the feathered setae on the lower margin of the pleura are omitted; ge telson, X 33; gd tip of telson, X 75; ge scaphocerite, X 20; gf second maxilliped, X 33; 9JT dactylus of third 'eg> X SO; g/t dactylus of fifth leg, X 50. (All the figures are taken from the egg-bearing female.) Fig. 10 — ioc. Stylodactylus Sibogae de Man. — 10 the type from Stat. 95, X 27; \oa rostrum, X 40; \ob right peraeopod of the y& pair, from the inner side, X 27; ioc dactylus of this leg, X 66. Siboga-Expeditie XXXIXa* J. G.deMan Caridae. de Man, del. PLATÉ VI. Fig. il — 1 1 ƒ. Systellaspis debilis (A. M.-Edw.) var. indica de Man. All the figures are taken from the egg- bearing female, collected at Stat. 161. — 11 carapace and isi abdominal somite, X 2; i i a third, fourth and fifth somite of the abdomen with the contiguous parts of the second and sixth, X 2; \\b postero-lateral margin of 4t!l, lic of 5th somite, X 6; 1 1 d peraeopod of 3rd pair, X 6; 1 1 ^ proximal, 1 1 ƒ distal part of dactylus, X 12. Fig. 12 — 126". Acanthephyra purpurea A. M.-Edw. — 12 carapace and the three anterior abdominal somites of the almost full-grown male from Stat. 208, X 1V2 (the carapace appears on this figure -J3 mm. too long!); 12a rostrum of the specimen, long 17 mm., from Stat. 203, that belongs to the parva-stage, X 50; 12b rostrum of one of the two specimens from Stat. 230, long 20 mm., that also belongs to the par va-stage, X 50; 12c first, second and third abdominal somite of the young specimen, long 34 or 35 mm., from Stat. 230, in which the yi somite presents still the characteristic shape of the parva-stage, though the rostrum is already formed like in the adult. Fig. 13 — 13a. Acanthephyra armata A. M.-Edw. — 13 telson of the adult male from Stat. 161, X 2; 13a extremity of telson of a male from Stat. 173, X 4- Fig. 14 — I4 4. Fig. 29c— 2qg. Plesionika assimilis de Man. All the figures are taken from the adult female with eggs, captured at Stat. 51. — 29c scaphocerite, X 10; 29^ last joints of first leg, X 25; 29^ rudimentary chela of ist leg, x 50; 29/ last joint of carpus and chela of the longer or left leg of 2nd pair, X 25; 290- dactylus of 3^ leg, X 33. Siboga-Expedüie XXXIXa* J. G.deMan. Caridae XI Fig. 25, 26, 20", 27-27'. 2Sa, 2if J. F. Obbes, Fig. 29^-29« J. O. de .Man, del. PLATE XII. Fig. 2je. Plesionika Sindoi (Rathb.). — The male from Stat. 253, x 4. Fig. 28. Plesionika unidens Bate. — Adult ova-bearing female from Stat. 65a, >< -• Fig. 29 — 29^. Plesionika assimilis de Man. All the figures are taken from the adult female with eggs, captured at Stat. 51. — 29 the whole animal, X 3; the fifth abdominal somite was in this specimen pushed into the fourth and appears therefore somevvhat shorter than usual; 29a proximal part of rostrum, X f; 2gb eyepeduncle, > 10. Fig. 30. Plesionika binoculus (Bate). — The largest female from Stat. 306, < 2. Fig. 31 — ^\b. Plesionika bifurca Alc. & Anders. — 31 full-grown, egg-laden female from Stat. 316, X 1V31 1\a caudal fan of this female, ■ 2; 31^ tip of the telson of the same specimen, x 6. Fig. 32 — 32e?'. Parapandalus Zur Strasseni Balss. All the figures are taken from the male captured at Stat. 185. — 32 carapace and rostrum, X 4; 32^7 distal part of rostrum, • 1^; 32b lateral view of anterior part of carapace, X. 13; 32e right scaphocerite, • 10; 32^ two last joints of 2nd maxilliped, > 2i3- Fig. 33( 6. Fig. 42 — 422'. Heterocarpus Sibogae de Man. — 42 adult ova-bearing female from Stat. 12, natural size; 42 a carapace with rostrum and the tvvo first abdominal somites of an adult male from the same Station, • ['/3; 42$ young specimen from Stat. 38, natural size; 42c carapace with abnormal rostrum of the full-grown ova-bearing female from Stat. 139, natural size; 42 d third leg of a male from Stat. 12, ■ 2; 42^ dactylus of this leg, X6; 42ƒ third leg of a female from Stat. 12, X 2; \2g dactylus of this leg, x6; 42 h third leg of a young specimen from Stat. 74, ■ 2; 42?' dactylus of this leg, ... 6. Siboga-Expeditie XXXiXa^ J. G. de Man. Caridae. XIV J. F. Obbes, del. PLATE XV. Fig. 43 — 43£". Heterocarpus dorsalis Bate. ■ - 43 carapace and rostrum of an adult female without eggs from Stat. 38, natural size; 43 a scaphocerite of this female, X 2; 43^ abdomen without telson, but with a part of the carapace, of an adult male, from Stat. 314, y i'/3; it shows distinctly the small tubercle near the posterior margin of the carapace; 43c first abdominal somite of this male with the four rounded tubercles, X 2; 43^/ right leg of 3>d pair of this male, X 2; 43^ last two joints of this leg, x 6; 43ƒ carapace and rostrum of the egg- bearing female from Stat. 300, natural size; 43 «• carapace and rostrum of an adult male from Stat. 316, natural size. Fig. 44 — 44_/~. Heterocarpus (Hetcrocarpoid.es) levicarina (Bate). All the figures are taken from an adult ova- bearing female, captured at Stat. 312. — 44 the whole female, x 22/3; 44^ second maxilla, X IO; 44^ the two last joints of ist peraeopod, x 17; 44c ischium of 2"d peraeopod, with the four curved spines near the middle of the lower margin, x 17; 44^ these spines more magnified, X 33; 44^ carpus and chela of 2nd peraeopod, X 17; 44/ leg of yd pair, x 17 (in this figure 44ƒ the propodus has wrongly been figured quite straight, it is, however, indeed slightly curved). Fig. 45, 45 a. Chlorotocella gracilïs Balss. — 45 base of rostrum and anterior border of carapace of the larger specimen from Stat. 164, ;■■: 33; 45a part of fourth and fifth abdominal somite of this specimen, X 33. Fig. 46 — 46c, 46e. Clilorotocus spinicauda de Man. — 46 full-grown egg-laden female from Stat. 51, X 4; 46a mandible, :• 37; 46^ mandibular palpus looked at from above, ■ 27' 4^c r'rs': rnaxilla, X 37; this figure shows the characteristic notch or incision on the middle branch (the single seta at the upper angle of the palp was lost); 4.6e terminal joint of the endopodite of the second footjaw, ;•: 37. (The four last figures were taken from the male, captured at Stat. 204). Sibocja-Expeditie XXXIXa' J. G.de Man. Caridae. XV. Fig. 4'5-43t'. 46 J. F. Obbes, Fig. 44-44/ 45, 45». 46a-4o<\ 46* J. O. de Man, del. ■■ PLATE XVI. Fig. 46d. Chlorolocus spinicauda de Man. — Second maxilliped of the male from Stat. 204, X 22. Fig. 47, 47 a. Psalidopus Huxleyi W.-Mas. — 47 the whole animal, natural size; 47^ terminal joint of the external maxilliped, X 8. Fig. 48 — 48^. Gnatkophyllum fasciolatum Stimps. — 48 telson of the larger female from Stat. 1S1, X 17; 48a tip of this telson, X 33; 48^ right external maxilliped of this female, x 17; 48r right peraeopod of the 2nd pajr 0f a male from Stat. 181, - 10; ófid fingers of this leg, X 33; 48 e dactylus of the left fifth peraeopod of the larger female from Stat. 181, > 33. Fig. 49. Hymenocera elegans Heller. — Caudal fan of the female from Stat. 220, X 17. Fig. 50 — 50/. Nikoides Sibogae de Man. — 50 anterior part of carapace with the eyes etc. of the larger female from Stat. 274, x 10; 50a lateral view of this anterior part, with the left eye, X 10; 50^ rostrum of this specimen, x 33; 50c extremity of the rostrum of this female, X 133; 50c/ telson of this female, x 20; 500- extremity of this telson, ■ 66; 50/ tip of scaphocerite of the same specimen, 'x 50; 50^ right, 50/! left peraeopod of the ist pair of this female, IO; the left bears the exopodite, which in the right peraeopod was broken off; 502' tip of telson of the specimen from Stat. 71, 66; 507' tip of scaphocerite of this specimen, X 50. Siboga-Expeditie XXXIXa? J. G. de Man. Caridae XVI. Fiy. 4b'', ls-43-', 49, 50-50/ J. G. ile Man, Fig. 47. 47- J. F. Übhes, del. ■ ':OAM PLATE XVII. F'g- 51 — S1"1- Pfocessa australiensis Baker. — 51 anterior part of the body of the full-grown, ova-bearing female from Stat. 273, :■' 17; 51^ lateral view of the anterior part of carapace of this female, X 33 ; 51^ extremity of rostrum of this specimen, > 100 ; 5 1 c lower border of the pleuron of the 5"1 abdominal somite of this female, X 66 ; 51^ telson of the same specimen, X 17; 51 e tip of telson of an egg-bearing female from Stat. 71, \ 66; e,if apex of scaphocerite of the female from Stat. 273, X 66; 51^ and 51 h right and left peraeopod of ist pair of this female, X ij; 512' and 51/ carpus and chela of the right, respectively left peraeopod of the 2nd pair of this female, ■ 33; 5 1 k pleopod of the 2n 20; 52rt rostrum and anterior border of carapace of this female in a lateral view, X 33; 52^ apex of rostrum of this specimen, looked at from above, X 66; 52c telson of this female, 33; 52^ tip of this telson, < 66; $2e extremity of the tip of this telson, x 200; 52/ left external maxilliped of this female, seen from the inner side, ■ 13; $2g and 52// right and left leg of 1 st pair of this female, ■ 33; 522 chela and part of carpus of the right second leg of this female, X 33; S2j rostrum of the young female from Stat. 154, ■ 50; 52/fr the same in a lateral view, X 50; 52/ lower border of the pleuron of the 5A abdominal somite of this female, • 66; 52 m telson of the female from Stat. 154, 33; 52» chela and part of carpus of the left 2°d leg of this female, X 66; 520 chela and part of carpus of the right 2"d leg of the egg-bearing female from Stat. 96, X 66; 52/ second leg of the young male from Stat. 4, X 66. Siboga-Expeditie XXXIXa? J. G. de Man. Caridae. XXII. 52' 52' 52" 51' 51 51 J. G. de Man, dei. PLATE XVIII. Fig. 53 — 53/'. Processa japonica (de Haan). — 53 anterior part of carapace with the eyes etc. of the specimen from Stat. 164, < IO; the antennal scales are broken off near the base; 53a anterior part of carapace of this specimen, X 17; 53/? telson of this specimen, x 10; 53^ tip of telson of the young female from Stat. 313, X 100; 53^ scaphocerite and antennal peduncle of this female, >< 17; 53e' right, 53/ left leg of ist pair of the specimen from Stat. 164, X 17; 53iT chela and last joint of carpus of the right, 53/* of the left second leg of the young female from Stat. 313, ■ IOO; 532' pleopod of 2Qd pair of the young male from Stat. 71.x 33; 537 stylamblys and appendix masculina of this pleopod, < IOO; 53/t tip of stylamblys of this pleopod, 320. Fig. 54 — 54/t. Glyplwcrangon regalïs Bate. — 54 the full-grown egg-bearing female from Stat. 74, natural size; 54« left scaphocerite of this female, .< 2; 54^ scaphocerite of the young female from Stat. 3S, < 4; 54<~ scaphocerite of the young specimen from Stat. 45, ■ 4; 54^, 54^ ar>d 54ƒ the two last joints of the peraeopods respectively of the 3rd, 4(11 and 5th pair of the full-grown female from Stat. 74, X 2; 540- peraeopod of the 5H1 pair of this female, < 1 '/, ; 54A and 54/ dactylus of the 3r(l pair of this female, looked at respectively from above and laterally, ■ 4; 547' and z>\k dactylus of the 5* pair of this female, looked at res- pectively from above and laterally, 4. F'g- 55 — 55^- Glyphocrangon regalïs Bate var.? — 55 carapace with eyes etc. of the young female from Stat. 85, <2; 55« scaphocerite of this female, X 22/3; 55^ peraeopod of 51'1 pair, X 1 '/2- Fig. 56. Glyphocrangon pitgnax de Man. — The larger female from Stat. 297, X 1 '/3- Siboga-Expedilïe XXXIXa? J. G.deMan Caridae. Wil! Fig. 53-33* J. G. de Man, Fig. 5-1-34*. 55-55", 56 J. F. Obbes del. PLATE XIX. Fig. 5Órt — 56^. Glypkocrangon pugnax de Man. — 56a lateral view of the larger female from Stat. 297, X i'3; 56^ carapace with the eyes etc. of this female, >( 2; 56c scaphocerite of this female, X 22/3. Fig- 5/ — 57 h- Glypkocrangon assimilis de Man. — 57 the ova-bearing female from Stat. 316, X iV3; 57 a the same female in a lateral view, X 1 1/3; 57 b carapace of this female, with the eyes, antennae and antennulae, X 2; 57c scaphocerite and antennal peduncle of this female, ' 31 3; 57^, 57^ and 57ƒ the three last joints of the peraeopods respectively of the 3rd, 4th and 5th pair of this female, X 4; 57 g fifth peraeopod of this female, X 2; 57/i carapace of the larger male, X 2. Fig. 58 — 58/. Glypkocrangon granulosis Bate. — 58 the full-grown ova-bearing female from Stat. 88, natural size; 580: scaphocerite and antennal peduncle of this female, >< 2; 58^, 58c and 58*/ the two last joints of the peraeopods respectively of the yü, 4H1 and 5th pair of this female, X 2; 581? and 58/ dactylus of the leg respectively of the yd and 5^ pair of this female, looked at from above, X 2. Fig. 59. Glypkocrangon Sibogae de Man. — The largest female with eggs from Stat. 45, natural size. Siboga-ExpediHe XXXlX.r' J. G. de Man Caridae. XIX. J. F. Obbes, del. PLATE XX. F'g- 59rt — 59^ Glyphocrangon Sibogae de Man. — 59a the largest female with eggs from Stat. 45 in a lateral view, natural size; 59^ scaphocerite and antennal peduncle of this female, X 2; 59e peraeopod of the 4A pair of this female, X -; 59<^ and 59^ dactylus of this leg, looked at respectively from above and laterally, X 4- Fig. 60 — 60 ƒ. Glyphocrangon megalophthalma de Man. — 60 the larger ovigerous female from Stat. 76, X i'/sj 60a the same female in a lateral view, X 1 '/3; 6o£ right scaphocerite and antennal peduncle of this female, X 2; 60c peraeopod of the 5* pair of the adult male from Stat. 208, X 2; 60a', 60e and 60/ dactylus, looked at from above, of the peraeopods respectively of the yd, 4'h and 5lh pair, of this male, X 2. Fig. 61. Glyphocrangon (Plastocrangon) caeca W.-Mas., the adult male from Stat. 170, X l'/a- Fig. 62 — 62c. Glyphocrangon (Plastocrangon) Faxoni de Man. — 62 the egg-bearing female from Stat. 297, X i1'.,; 62a the same in a lateral view, X 1 V3 J 62^ carapace of this female with eyes, antennae and antennulae, X 2; 62c rostrum of this female, X 4- Fig. 63, 63*7. Pontopiulus occidentalis Faxon var. tndica de Man. — 63 ova-bearing female from Stat. 316, X 2; 63a: the same specimen in a lateral view, X 2. Siboga Expeditie XXXIXa? J. G.deMan. Caridae XX. J. F. Obbes, del. ■ PLATE XXL Fig. 63b — 63^. Pontophilus occïdentalis Faxon var. indica de Man. — 63b carapace of the ova-bearing female, N° 4 of Table B, from Stat. 88, X 6; 63^ the anterior and the posterior gastric tooth of this female, >( 33; &3d carapace of an ova-bearing female from Stat. 316, X 6; 63 ' 17 ; 63A rostrum of the ova-bearing female, N° 2 of Table B, from Stat. 45, X 17; 63/ scapho- cerite of an ova-bëaring female from Stat. 316, X 8; 61 j anterior peraeopod of an ova- bearing female from Stat. 316, seen from below, X 2; 63/L' peraeopod of the 2nd pair of an ova-bearing female from Stat. 45, X 17; 63/ chela of this leg, -X 33; 631/1 and 6371 the three last joints respectively of the 4^ and 5th peraeopod of the same female from Stat. 45, < 6; 630 pleopod of is' pair of the male from Stat. 300, X "; 63/1 inner ramus of this appendage, X 33; 63 q tip of this ramus, X 213; 63;' pleopod of 2"d pajr Df this male, X 1 r ; 63^ stylamblys and appendix masculina of this pleopod, X33; 63/ tip of the stylamblys, < 213; 63?^ pleopod of i*t pair of the ova-bearing female, N" n of Table B, from Stat. 316, X il; 63 v pleopod of 2°d pair of this female, with 3 ova, X n. Fig. 64 — 6A.e, 6$g — 647'. Pontophilus modnmanuensis Rathb. — 64 carapace of the adult female from Stat. 297, >( io; £>\a the two gastric spines of this female, X 33; 64.0 rostrum, eyepeduncles etc. of this female, X 33; 64c tip of telson of this female, X 75; 64^ scaphocerite of this female, X 10; 64,? second peraeopod of this specimen, X 33; 64^ rostrum, eyepeduncles etc. of the larger female from Stat. 89, X 33; 64A scaphocerite of this female, X 10; 64.1 carpus and subchela of this female, seen from the lower side, X 17; 647 second peraeopod of the same female from Stat. 89, X 33. Siboga-Expedilie XXXIXa3 J. G.deMan Caridae. XXI. 64" Fig. 63*-63', 63*-63», 64-64<-, 64?-64/ J. G. de M.-.n, Fig. 63; J. F. Obbes. del. PLATE XXII. Fig. 64./. Pontophihis modumanuensis Rathb. — Second pleopod of the adult female from Stat. 297, X 27. Fig. 65- — 65_/. Pontophihis modestits de Man. All the figures are taken from the larger specimen, excepting 652 and 65 j, that are taken from the smaller. — 65 carapace with the eyes etc, X 12; 65 a lateral view of the carapace, X 12; 65 £ rostrum, eyes etc, X 33; 65 c tip of telson, X IOO; 65^ scaphocerite, X 20; 65^ left subchela with carpus, X 20; 65 ƒ peraeopod of 4th> 65_g- of 5th pair, X 20; 65 h pleopod of 2nd pair, X 27; 652 scaphocerite of the smaller specimen, X 20; 65/ subchela with carpus of this specimen, X 20. Fig. 66, 66a. Pontophihis incisus Kemp. — 66 rostrum, eyes etc. of the egg-laden female from Banda, X 33; 66a the abruptly deflexed, distal part of the rostrum, looked at from before, of the same specimen, X 33. Fig. 6y — 67 g, 67 k, 67 ti, 670. Pontophihis angustirostris de Man. — 67 carapace, eyes etc. of the female from Stat. 273, X 14; 67a the same female in a lateral view, X 14; 670 rostrum of this specimen, X 33; 67c tip of telson of the same female, X 66; 67 d scaphocerite of this female, X 20; 67e peraeopod of 2nh pleopod of 2i>d pair of the female, X 27; 68/ endopod of this pleopod, X 66. Fig. 69 — 69c, 69e, 6gg — 69/. Pontophilus japonicus Doflein. — 69 carapace and eyes of the male from Stat. 105, X 20; 69a rostrum of this male, X 33, the anterior margin appears asymmetrical, an indi- vidual abnormality of course; 69^ rostrum of the female from Stat. 95, X33; 69* scapho- cerite of the male, X 33; 69* terminal part of the fingers of the 2nd peraeopod of the male from Stat. 105.x 66; 69 g the two appendages on the inner branch of the 2nd pleopod of this male, X 66; 69/; pleopod of 5th pair of the male, X 33; 692 stylamblys of this pleopod, X 66. Siboqa-Expedüie XXXIXa' J. G.de Man. Caridae. XXIII, J. G. de .Man, del. PLATE XXIV. Fig. 6gd, 6gf, 6gj. Pontophilus japonicus Doflein. — 6gd second leg of the male from Stat. 105, X 33; 6gf pleopod of 2nd pair of the male, X 33; 6gj inner branch with stylamblys of the pleopod of the 2n71,7]ff,71/,72-72/,73,73a,74ö)J. F. Obbes, del. ' WAN -=E*. -" PLATE XXV. Fig. 74, 74«. Aegeon Rathbuni de Man. — 74 the type from Stat. 89, X 22/3; 74a lateral view of the type, X 22/3- Fig. 75 — 75/. Sabinea indïca de Man, female from Stat. 65a. — 75 the whole type, X4; 7Sa carapace with the eyes etc. X 6; j$b caudal fan, X 6; 75c tip of telson, X 75; 7^d lateral view of the left leg of is> pair, X 7; 7Se subchela of this leg, seen from below, X 7; 75/ peraeopod of the 2°d pair, X 17; 7%g the two last joints of this leg, X 33; 7^h right peraeopod of the 4'h pair, X 7; 75* pleopod of is' pair, X 1 1 ; 757 four of the long flexible hairs on the anterior part of the protopod of this pleopod, X 33; 75 £ stylamblys on the second pleopod, X 33; 7^1 one of the cincinnuli of this stylamblys, X 320. Fig. 76 — 761. Prionocrangon ommatosteres W.-Mas. — 76 carapace, with the two pairs of antennae, of the adult male from Stat. 211, X 7', 76a anterior part of the carapace of this male, showing the bases of the two pairs of antennae and the transformed eyepeduncles, X '7; 76b caudaj fan of the adult female from Stat. 88 (the feathering of the hairs is not figured), X 10 ; 76c tip of telson of this female, X 50 ; 76d subchela of the left leg of 1 st pair of the male, looked at from below, X 13; 76e the two last joints of the left leg of the 2nm 2.50 ;e Livr. (Monogr. XLVII) H.F. Nierstrasz. The Solenogastres of the Siboga-Exp. With 6 plates. „ 3.90 „ 4.90 1 ,ïvr. (Monogr. XIII) J. Versluys. Die Gorgoniden der Siboga-Expedition. I. Die Chrysogorgiidae. Mit 170 Figuren im Text , 3. — „ 3.75 7e Livr. (Monogr. XVI a) A. AlCOCk. Report on the Deep-Sea Madreporaria of the Siboga- Expedition. With 5 plates „ 4-öo , 5.75 8e Livr. (Monogr. XXV) C. Ph. Sluiter. Die JSipunculiden und Echiuriden der Siboga-Exp. Mit 4 Tafeln und 3 Figuren im Text. . . . :• '• • » 3- — » 3-75 9e Livr. (Monogr. Vla) G. C. J. Vosmaer and J. H. Vemhout. The Porifera^of the Siboga- Expedition. I. The genus Placospongia. With 5 plates „ 2.40 „ 3. — ioe Livr. (Monogr. XI) OttO Maas. Die Scyphomedusen der Siboga-Expedition. Mit 13 Tafeln. „ 7.50 „ 9.50 ue Livr. (Monogr. XII) Fanny Moser. Die Ctenophoren der Siboga-Expedition. Mit 4 Tafeln. „ 2.80 „ 3.50 12e Livr. (Monogr. XXXIV) P. Mayer. Die Caprellidae der Siboga-Expedition. Mit \o Tafeln. „ 7.80 „ 9.75 13c Livr. (Monogr. III) G. F. Tydeman. Hydrographic results of the Siboga-Expedition. With 24 charts and plans and 3 charts of depths . „ 9. — ' „ 11.25 14e Livr. (Monogr. XLIII) J. C. H. deMeijere. Die Echinoidea der Siboga-Exp. Mit 23 Tafeln. „ 15.— „ 18.75 15e Livr. (Monogr. XLVrt)' René Koehler. Ophiures de 1'Expédition du Siboga. ie Partle. Ophiures de Mer profonde. Avec 36 Planches „ 16.50 „ 20.50 16e Livr. (Monogr. LII) J. J. Tesch. The Thecosomata and Gymnosomata of the Siboga- Expedition. With 6 plates » 37S- » 47° 17e Livr. (Monogr. LVla) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. \ I. Abteilung. Die socialen und holosomen Ascidien. Mit 15 Tafeln „ 6.75 „ 9. — iSe Livr. (Monogr. LXI) A. Weber— van Bosse and M. Foslie. The Corallinaceae of the Siboga- Expedition. With 16 plates and 34 textfigures /. . • » 12.50 „ 15.50 19e Livr. (Monogr. VIII) Sydney J. Hickson and Helen M. England. The Stylasterina of the Siboga Expedition. With 3 plates ■ . ' „ 1.50 „ 1.90 20e Livr. (Monogr. XLVIII) H. F. Nierstrasz. Die Chitonen der Siboga-Exp. Mit 8 Tafeln. „ 5.— „ 6.25 21e Livr. (Monogr. XLV£) René Kdehler. Ophiures< de 1'Expédition du Siboga. 2e Partie. Ophiures littorales. Avec 18 Planches . . . j „10.25 „ 12.75 22e Livr. (Monogr. XXVlbis) Sidney F. Harmer. The Pterobranchia of the Siboga-Expedition, with an account of other species. With 14 plates and 2 text-figures „ 6.75 „ 9. — 23e Livr. (Monogr. XXXVI) W. T. Calman. The Cumacea of the Siboga Expedition. With 2 plates and 4 text-figures i /..........„ 1.80 „ 2.40 24e Livr. (Monogr. LVIa) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. Supplement zu der I. Abteilung. Die socialen und holosomen Ascidien. Mit 1 Tafel. „ — .75 „ 1. — 25e Livr. (Monogr. L) Rud. Bergh. Die Opisthobranchiata' der Siboga-Exped. Mit 20 Tafeln. „ 11.25 „ 14.10 26e Livr. (Monogr. X) OttO Maas. Die Craspedoten Medusen der Siboga-Exp. Mit 14 Tafeln. „ 9.25 „ 12.50 27e Livr. (Monogr. XIII a) J. Versluys. Die Gorgoniden der Siboga-Expedition. II. Die Primnoidae. Mit 10 Tafeln, 178 Figuren im Text und einer Karte . . . „ 12.50 „ 16.75 28e Livr. (Monogr. XXI) G. Herbert Fowler. The Chaetognatha of the Siboga Expedition. With 3 plates and 6 charts „ 4-2° * 5-25 29e Livr. (Monogr. LI) J. J. Tesch. Die Heteropoden der Siboga-Expedition. Mit 14 Tafeln. „ 6.75 B 9. — 30e Livr. (Monogr. XXX) G. W. Muller. Die Ostracoden der Siboga-Exped. Mit 9 Tafeln. „ 3.50 „ 4.40 31e Livr. (Monogr.. IV bis) Franz Eilhard Schulze. Die Xenophyophoren der Siboga-Exped. Mit 3 Tafeln \ „ 2.40 n 3.— 32e Livr. (Monogr. LIV) Maria Boissevain. The Scaphopoda of the Siboga Expedition. With 6 plates and 39 textfigures „ '4.80 „ 6. — 33e Livr. (Monogr. XXVI) J. W. Spengel. Studiën über die Enteropneusten der Siboga-Exp. Mit 17 Tafeln und 20 Figuren im Text. ( „ 14. — „ 17.50 34e Livr. (Monogr. XX) H. F. Nierstrasz. Die Nematomorpha der Siboga-Exp. Mit 3 Tafeln. „ 2.80 „ 3.50 35e Livr. (Monogr. XHIr) Sydney J. Hickson und J. Versluys. Die Alcyoniden der Siboga- Exped. I. CoralliidK, II. Pseudocladochonus Hicksoni. Mit 3 Tafeln und 16 Figuren im Text. „ 2.20 B 2.75 36e Livr. (Monogr. XXXIa) P. P. C. Hoek. The Cirripedia of the Siboga Expedition. A. Cirripedia pedunculata. With 10 plates „ 5.40 B 6.75 37e Livr. (Monogr. XLlla) L. DÖderlein. Die gestielten Crinoiden der Siboga-Expedition. Mit 23 Tafeln und 12 Figuren im Text * 8.t— „ 10. — 38e Livr. (Monogr. IX) Albertine D. Lens and Thea van Riemsdijk. The Siphonophores of the Siboga Expedition. With 24 plates and 52 textfigures „ 13.50 „ 16.75 39e Livr. (Monogr. XLIX'ö) M. M. Schepman. the Prosobranchia of the Siboga Expedition. Part I. Rhipidoglossa and Docoglossa, with an Appendix by Prof. R. Bergh. With 9 plates and 3 textfigures . . „ 4.80 „ 6. — 40e Livr. (Monogr. XL) J. C. C. Loman. Die Pantopoden der Siboga-Expedition. Mit 15 Tafeln und 4 Figuren im Text » 6.25 „ 7.8Ö 41e Livr. (Monogr. LVIc) J. E. W. Ihle. Die Appendicularien der Siboga-Expedition. Mit 4 Tafeln und 10 Figuren im Text „ 4.80 „ 6. — 42e Livr. (Monogr. XLIX2) M. M. Schepman und H. F. Nierstrasz. Parasitische Proso- branchier der Siboga-Expedition. Mit 2 Tafeln fl ^.20 B 1.50 26. — ■ 32.50 5-75 ■ 7-25 — .8o 1, I-— 8.50 * ">-75 1.60 , 2.— Prix: Souscrïption Monographies a 1'ouvrage complet scparccs 43e Livr. (Monogr. XLIX1*) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part II. Taenioglossa and Ptenoglossa. With 7 plates ƒ 4.50 ƒ 5.60 44e Livr. (Monogr. XXIXa) Andrew Scott. The Copepoda of the Siboga Expedition. Part I. Free-swimming, Littoral and Semi-parasitic Copepoda. With 69 plates. . 45e Livr. (Monogr. LVI*) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. II. Abteilung. Die Merosomen Ascidien. Mit 8 Tafeln und 2 Figuren im Text. 46e Livr. (Monogr. XLIX't) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part III. Gymnoglossa. With 1 plate 47e Livr. (Monogr. XIII b) C. C. Nutting. The Gorgonacea of the Siboga Expedition. III. The Muriceidae. With 22 plates 48e Livr. (Monogr. XIII*1) C. C. Nutting. The Gorgonacea of the Siboga Expedition. IV. The Plexauridae. With 4 plates 49e Livr. (Monogr. LNld) J. E. W. Ihle. Die Thaliaceen (einschliesslich Pyrosomen) der Siboga-Expedition. Mit 1 Tafel und 6 Figuren im Text „ 1.75 „ 2.20 50e Livr. (Monogr. XIII b2) C. C. Nutting. The Gorgonacea of the Siboga Expedition. V. The Isidaï. With 6 plates „ 2.25 „ 3.—- 51e Livr. (Monogr. XXXVII) H. J. Hansen. The Schizopoda of the Siboga Expedition. With 16 plates and 3 text fïgures „ 12.75 „ 16. — 52e Livr. (Monogr. XIII b3) C. C. Nutting. The Gorgonacea of the Siboga Expedition. 1 VI. The Gorgonellidas. With 1 1 plates n 4. — B 5. — 53e Livr. (Monogr. XV a) J. Playfair Mc Murrich. The Actiniaria of the Siboga Expedition. Part I. Ceriantharia. With 1 plate and 14 text fïgures „ 2.20 „ 2.75 54e Livr. (Monogr. XIII*4) C. C. Nutting. The Gorgonacea of the Siboga Expedition. VII. The Gorgonidas. With 3 plates „ 1.20 „ 1.50 55e Livr. (Monogr. XXXIX a) J. G. de Man. The Decapoda of the Siboga Expedition. Part ■ I. Family Penaeidae , „ 2.60 „ 3.25 56e Livr. (Monogr. LXII) A. & E. S. Gepp. The Codiaceae of the Siboga Expedition including a Monograph of Flabellarieae and Udoteae. With 22 plates 57e Livr. (Monogr. Xlllb5 C. C. Nutting. The Gorgonacea of the Siboga Expedition. VIII. The Scleraxonia. With 12 plates 58e Livr. (Monogr. XLIX1^) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part IV. Rachiglossa. With 7 plates 59e Livr. (Monogr. Vla1) G. C. J. Vosmaer. The Porifera of the Siboga-Expedition. II. The genus Spirastrélla. With 14 plates 60e Livr. (Monogr. XXXIX a]) J. G. de Man. The Decapoda of the Siboga Expedition. Part II. Family Alpheidae 61e Livr. (Monogr. LlIIa) Paul Pelseneer. Les Lamellibranches de 1'Expédition du Siboga. Partie Anatomique. Avec 26 planches 62e Livr. (Monogr. XXIV1 a) R. Horst. Polychaeta errantia of the Siboga Expedition. Part I. Amphinomidae. With 10 plates 63e Livr. (Monogr. LUI*) Ph. Dautzenberg et A. Bavay. Les Lamellibranches de 1'Expéd. du Siboga. Partie Systématique. I. Pectinidés. Avec 2 planches 64e Livr. (Monogr. XLIX1^) M. M. Schepman. The Prosobranchia of the. Siboga Expedition. Part V. Toxoglossa. With 6 plates and 1 textfigure 65e Livr. (Monogr. LVII) Max Weber. Die Fische der Siboga-Expedition. Mit 12 Tafeln und 123 Figuren im Text . . . : 22. — „ 27.50 66* Livr. (Monogr. XLIX/) M. M. Schepman. The Prosobranchia, Pulmonata and Opistho- branchia Tectibranchiata Tribe Bullomorpha of the Siboga Expedition. Part VI. Pulmonata and Opisthobranchia Tectibranchiata Tribe Bullomorpha. With 2 plates „ 1.75 , 2.20 67e Livr. (Monogr. XXXI*) P. P. C. Hoek. The Cirripedia of the Siboga-Expfedition. B. Cirripedia sessilia. With 17 plates and 2 textfigures „ 8. — „ 10. — 68e Livr. (Monogr. LlXa) A. "vVeber-van Bosse. Liste des Algues du Siboga. I. Myxophyceae, Chlorophyceae, Phaeophyceae avec Ie concours de M. Th. REINBOLD. Avec 5 planches et 52 fïgures dans Ie texte „ 6. — , 7,50 69e Livr. (Monogr. XXXIXtf) J. G. de Man. The Decapoda of the Siboga Expedition. Supplement to Part I. Family Penaeidae. Explanation of Plates „ 3.20 n 4. — 70e Livr. (Monogr. Vila) A. Billard. Les Hydroïdes de 1 Expedition du Siboga. I. Plumularidae. Avec 6 planches et 96 fïgures dans Ie texte „ 5.75 „ 7.2c 71e Livr. (Monogr. XXXIX*) J. E. Vv7. Ihle. Die Decapoda brachyura der Siboga-Expedition. I. Dromiacea. Mit 4 Tafeln und 38 Figuren im Text , 3.50 „ 4.40 72e Livr. (Monogr. XXXII a) H. F. Nierstrasz. Die Isopoden der Siboga-Expedition. I. Isopoda chelifera. Mit 3 Tafeln „ 2.15 „ 2. 60 73e Livr. (Monogr. XVII) A. J. Van Pesch. The Antipatharia of the Siboga Expedition. With 8 plates and 262 textfigures „ 10.75 B '3-50 74e Livr. (Monogr. XXXIXa') J. G. de Man. The Decapoda of the Siboga Expedition. Supplement to Part II. Family Alpheidae. Explanation of Plates „ 7. — „ 8.75 75e Livr. (Monogr. XXVIIIa) Sidney F. Harmer. The Polyzoa of the Siboga Expedition. Part I. Entoprocta, Ctenostomata and Cyclostomata. With 12 plates „ 8.80 „ 11. — 76e Livr. (Monogr. XXXIX a2) J. G. de Man. The Decapoda of the Siboga Expedition. Part III. Families' Eryonidae, Palinuridae, Scyllaridae and Nephropsidae. With 4 plates „ 3.75 „ 4.75 12.50 » I5.5O 4.80 V 6.— 5-— n 6.25 6.20 » 7-75 6.40 'i> 8.— 10. — » 12.50 3.85 71 4.80 2.25 n 2.80 4.80 V 6.— Piix : Souscription Monographies a 1'ouvrage complet séparées 77e Livr. (Monogr. XIV) Sydney J. Hickson. The Pennatulacea of the Siboga Expedition, vvith a general survey of the order. With 10 plates, 45 text figures and 1 chart'. . . . ƒ10.75 ƒ13.50 78e Livr. (Monogr. XXXIX£') J. E. W. Ihle. Die Decapoda brachyura der Siboga-Expedition. II. Oxystomata, Dorippidae. Mit 39 Figuren im Text „ 1.90 B 2.40 79c Livr. (Moncgr. LXV) O. B. BÖggild. Meeresgrundproben der Siboga-Expedition. Mit 1 Tafel und 1 Karte „ 2.25 „ 3.— 80e Livr. (Monogr. XXIV b) R. Horst. Polychaeta errantia of the Siboga Expedition. Part II. Aphroditidae and Chrysopetalidae. With 19 plates and 5 textfigures . . . . „ 7.75 „ 9.75 8 ie Livr. (Monogr. XLVIw) L. DÖderlein. Die Asteriden der Siboga-Expedition. I. Die Gattung Astropecten und ihre Stammesgeschichte. Mit 17 Tafeln und 20 Figuren im Text „ 8.75 , 11.— 82e Livr. (Monogr. XXXIX c) J. J. Tesch. The Decapoda brachyura of the Siboga Expedition. I. Hymenosomidae, Retroplumidae.Ocypodidae, Grapsidae and Gecarcinidae. With 6 plates. „ 5. — „ 6.25 83e (Monogr. XLII<5) Austin H. Clark. The unstalked Crinoids of the Siboga Expedition. With 28 plates and 17 textfigures „ 16. — „ 20. — 84e Livr. (Monogr. XXXIXc1) J. J. Tesch. The Decapoda brachyura of the Siboga Expedition. II. Goneplacidae and Pinnotheridae. With 12 'plates „ 6.75 , 9. — 85e Livr. (Monogr. XXXIX b'1) J. E. W. Ihle. Die Decapoda brachyura der Siboga-Expedition. III. Oxystomata: Calappidae, Leucosiidae, Raninidae. Mit 71 Figuren im Text. . . . „ 5.60 „ 7. — 86e Livr. (Monogr. XXXVIII) H. J. Hansen. The Sergestidae of the Siboga Expedition. With 5 plates and 14 text figures „ 4-5° n 6. — 87e Livr. (Monogr. XXXIXrt3) J. G. de Man. The Decapoda of the Siboga Expedition. Part IV. Families Pasiphaeidae, Stylodactylidae, Hoplophoridae, Nematocarcinidae, Thalassocaridae, Pandalidae, Psalidopodidae, Gnathophyllidae, Proces- sidae, Glyphocrangonidae and Crangonidae. With 2 5~plates . . . . „ iS. — „ 27. — Voor de uitgave van de resultaten der Siboga-Expeditie hebben bijdragen beschikbaar gesteld: De Maatschappij ter bevordering van het Natuurkundig Onderzoek der Nederlandsche Koloniën. Het Ministerie van Koloniën. Het Ministerie van Binnenlandsche Zaken. Het Koninklijk Zoologisch Genootschap > Natura Artis Magistra" te Amsterdam. De >Oostersche Handel en Reederij" te Amsterdam. De Heer B. H. de Waal, Oud-Consul-Generaal der Nederlanden te Kaapstad. M. B. te Amsterdam. The Elizabeth Thompson Science Fund. Dr. J. G. de M. te Ierseke. v CONDITIONS GÉNÉRALES DE VENTE. ( i°. L'ouvrage du „ Siboga" se composera d'une série de monographies. 2°. Ces monographies paraitront au fur et a mesure qu'elles seront prêtes. 30. Le prix de chaque monographie sera différent, mais nous avons adopté comme base générale du prix de vente: pourune feuille d'impression sans fig. flor. 0.15; pour une feuille avec fig. flor. 0.20 a 0.25; pour une planche noire flor. 0.25; pour une planche coloriéa flor. 0.40 ; pour une photogravure flor. 0.60. 40. Il y aura deux modes de souscription a. La souscription a l'ouvrage complet. b. La souscription a des monographies séparées en nombre restreint. Dans ce dernier cas, le prix des monographies sera majoré de 50 °/0. 50. L'ouvrage sera réuni en volumes avec titres et index. Les souscripteurs a l'ouvrage complet recevront ces titres et index, au fur et a mesure que chaque volume sera complet. Ui!' M I il 11111 18 li- tu i jHijljijni»', ■ Slllllllll il ilüisiii 1 ! . . i ,( | j( ||lj Jl ii| É