IIlSlï il Élï ■ I 1111 ■11 111; r tl!» il i P \\\\\ ■ •• 1 i lil :i!hI'!Hi!im Wil il Hit ililüi Hl 1 illlll :11 ;ti il il SIBOGAEXPEDITIE. Siboga-Expeditie UITKOMSTEN OP \ HOT I (D unn VERZAMELD IX NEDERLANDSCH OOST-INDIÊ 1899— 1900 AAN BOORD H. M. SIBOGA ONDER COMMANDO VAN Luiteftanl ter zee I kl. G. F. TYDEMAN UITGl Gl V] N DOOR Dr. MAX WEBER Prof. in Amsterdam, Leider der Expeditie (met rnedi chappij ter bevordering van het Natuurkundig < >nderzoek «Ier Nederl; I KHANDEL EN DRUKKERIJ I •:. .1. BRILL I EIDl N Sib o ga- Expeditie XLIIb THE UNSTALKED CRINOIDS OF THE SIBOGA EXPEDITION BY AUSTIN H. CLARK Washington, D. C, U. S. A. With XXVIII plates and 17 text figures ^>&©?-=3< late E. J. BRILL PÜBLISHERS AND PRINTERS LEYDEN 191 S INTRODUCTION. PREFACE. The privilege and pleasure of studying the wonderfully rich collection of unstalked crinoids brought home by the "Siboga" I owe to the courtesy and generosity of my friend Professor René Koehler. While I was visiting him at Lyons in the summer of 1910 he showed me, among many interesting things, an extraordinary assemblage of comatulids from the East Indies, which he said he would be glad to turn over to me if I cared to study them. Naturally I hesitated at depriving him of the opportunity offered by this material for the elucidation of many obscure points in regard to the East Indian crinoid fauna, but with his characteristic unselfishness he insisted that I should undertake the work. Much of the satisfaction which I have derived from the present study has been due to the fact that my friend Professor Ludwig Doderlein prepared the companion volume upon the stalked crinoids, and I have been keenly appreciative of the honour of being thus associated with him. SCOPE OF THE PRESENT WORK. In a recently published memoir entitled "Crinoids of the Indian Ocean" (Calcutta, 191 2) I brought together all the information regarding the crinoids of the Indo-Pacific region, and included an historical introduction and a complete bibliography. The present work is essentially a refinement of the preceding. Every family, genus and species has been reëxamined, and nevv keys have been prepared for all of the subfamilies, genera and species. In spite of the great amount of new material, relatively few changes have been found necessary, and these changes fall chiefly in the very difficult family Antedonidae. Every comatulid genus is mentioned, though the extralimital are as a rule not treated in detail. It has seemed advisable, however, to include keys to the species of the genus Antaion of the middle and northeastern Atlantic, of Leptometra of the east and northeast Atlantic, of Coccometra of the Caribbean region and of Florometra of the east and north Pacific in order to emphasize their similarity, and the similarity of their internal interrelationships, to the corresponding East Indian types, Mastigometra and Etiantedoti, Psathyro??ietra, Thysano- metra and Cyclometra. 482£ lt f) rent families varies slightly, some being ned necessary to treat the relatively . uk 1) is called for in the case of the more obscure |n ilked species described bij Professor Döderli | ticrinidae {minimus, nodipes, poculum and weèeri) with m\ recent revision of that family, in "Die Crinoiden new spi f Isocrinus [Sibogaé] is assigned to the is now understood, both by Professor Döderleu) and myself, in. erature include all in which original matter occurs, but tl in which i lal matter is found are omitted. 1111. "SIBOGA" COLLECTION. tions made by exploring expeditions since the time of the "Challenger" els in the number of species and of individuals, and in the number ty of those smal! forms too often discarded as the "young" of the larger types. In making this statement I am assuming that comparison with the collections of the would not be quite fair, as that ship took her first dredge haul on March ::. I has been almost continuously at work ever since, that is to saj for a period of ly thirty-four years, cruising throughout the western Atlantic and Caribbean regions, and l«art f>t' the Pacific, and spending the time from November 7, 1907 to January the Philippine Islands and in adjacent waters, where she covered a part of j previously worked by the "Siboga". Thi bv the "Siboga" carried her over uh.it is possibly the most inter- igraphically speaking, in the whole world; she gathered the Australian 1 at the Aru Islands, and the Malayan fauna in the Sulu archipelago, and paid particular the intermediate region, among the Moluccas and about the Lesser Sunda Islands which, in water of moderate depth, possess a fauna certainly distinct trom that of the Philippines and I islands as we know it, and nlated rather to that of southern Japan, though from in indications it may possibly be a continuation of the deeper Australian fauna which elf further to the northward and westward than does the fauna of the littoral. known from the recent seas 576 species of crinoids, representing 142 genera families and subfamilies. Of these, 76 species, included in 22 genera and l, while 500 ipecies, I2ü genera and 22 families and subfamilies are <■; itulid t\ In her explorations the "Sibo llected 163 species (140 comatulids of which no less than 73 (64 comatulids and 9 stalked species were an increase of 1 \ .5 percent in the number of known tonus. fall into 71 genera 65 comatulid and 6 stalked); just over half ol INTRODUTION. vil all those known, of which three, all unstalked, are new. Two of these new genera are closely related to others previously described, but the third is an extraordinary and unique t\ The 71 genera are included in 21 families and subfamilies (19 comatulid and 2 stalked), all previously known. It is often quite as interesting and instructive to consider what is lacking in a collection as what is present. The 7 families and subfamilies of which the "Siboga" did not secure representatives are : Thysanometrinae A piocrinidae Isometrinae Phrynocrinidae Heliometrinae Plicatocrinidae Holopodidae the first three comatulids, the last four stalked types. Thus we still know the Holopodidae only from the Caribbean Sea, and the Isometrinae only from the Antarctic regions. A representative of the Thysanometrinae is known to occur in the region traversed by the "Siboga", where it was collected both by the "Challenger" and by the "Albatross"; its absence from the "Siboga" collection emphasizes anew the extreme difficulty of securing a complete collection of the crinoids inhabiting any one locality. The Heliometrinae are represented by a single genus in the Indo-Pacific region which has only been reported from southwestern Japan and the Arabian Sea, a single species represented by a single specimen from each locality. The "Challenger" dredged a single very fragmentary specimen of a species of Apio- crinidae (Carpenterocrinus mollis) south of Japan, and the "Albatross" a single specimen of another genus {Proisocrinus ruberrimus) west of Luzon. The family, though so important as a fossil, is not otherwise known from the recent seas. The "Challenger" secured a specimen of a species of Plicatocrinidae (recorcled as "}Hyocrinus bethel lianits") in 5°3i'N.J 145° 13' E., at a depth of 4185 Metres; the "Albatross" secured another {Thalassocrinus pontifer) in the Moluccas. The Phrynocrinidae remain known only from southern Japan and the Hawaiian Islands, one genus (Phrynocrinus and Naumachocrimis respectively) from each locality; there are in existence three specimens altogether, two of one and one of the other, all three incomplete. The genera Democrinus, Bythocrimis and Monachocrinus of the Bourgueticrinidae were first found in the East Indian region by the "Siboga"; but it is quite possible that the " Rhyzo- crimts" mentioned by Korotxeff *) is Democrinus weberi. For the sake of comparison it may be mentioned that the "Albatross" also failed to secure representatives of 7 families and subfamilies : Heliometrinae Holopodidae Isometrinae Bourgueticrinidae Perometrinae Phrynocrinidae Tropiometridae 1) Buil de 1'Acad. roy de Belgique, sér. 3, vol. 12, 1886, p. 558. I, and collected only a single specimen of a Apiocrinid Plicatocrinidae illy interesting typi nt alike from the "Challengi bui dredged by both the "Investigator" and the "Valdivia", i bi tutiful pentacrinite related to Hypa(ocrinus which ranges, |y from western Sumatra to the western coast of India. interes! in connection with the "Siboga" collection are thirteen in ii i .ui entirely new type of Atelecrinidae with five arms and no m of the extraordinarily small bourgueticrinoids of the genus Monacho- . a genus not heretofore known from the East tndian region. The discovery of an extremely small bourgueticrinoid of the genus Bytkocrinus i genus not heretofore known from the East Indian region. I Ihe discovery of an exceedingly large bourgueticrinoid of the genus Democrinus genus previously known only from the Atlantic, though probably the genus referred !-. . • :i tuier the name Rhyzocrinus. Ihe discovery <>f a close relative of the European genus Antedon {Euantedori) which, with the allied genus Mastigometra, represents it in the east. 6. The discovery ol a new type of the genus Atelecrinus with short cirri and very isals Atelecrinus anomalus). -. rh overy of three remarkable species of Eudiocrinus two of which represent entirely new types, while the third represents a type hitherto only known from southern Japan. rh discovery of two entirely new types of the genus Keomcfra (represented by .\*. diana and X . sióogae), one of which has been recently found by the "Endeavour" oft tern Australia. i overy of three tropical species of Comp >sometra , two ol which are ol extremely small size {iris, longicirra and parviflot I lie discovery of three small species of Decametra {parva, laevipinna and minima) which link this genus with Prometra and with Oligometra. ii. Ihe discovery of three small species of Psathyrometra (minima, inusitata and which almost bridge the gap between the Zenometrinae and the Bathymetrinae. I >v< ry of an extraordinary series of nine species in ihe familie, Comasteridae ' apillaster tenuicirra, Comatula tenuicirra, Comaster sióogae), Himero- propinqua), Mariametridae {Oxymetra tenuicirra, Dichrometra tenuicirra, 1 olobometridae Cyllometra gracilis) all of which are very closely nown types from which they differ in possessing Ion- and slender long- all hm Oxymetra tenuicirra, Mariametra tenuicirra and Cyllometra gracilis iw and muddy Java S< > INTRODUCTION. IX 13. The discovery of the most ornate comatulid known [Strotometra ornatissimus) which exhibits an exaggerated eversion of the distal edges of the brachials finding a parallel only in the pentacrinite genus Comastrocrinus. ZOÖGEOGRAPHICAL RELATIONSHIPS OF THE NEW SPECIES. Most of the new species in the "Siboga" collection are more or less closely related to previously known Indo-Malayan types, and offer nothing of especial zoögeographic interest; but nine of them — a number too large to be ignored — from the Lesser Sunda Islands from Sumbawa eastward, and from the Moluccas, are related not to other species from the Indo- Malayan region, but to species from southern Japan, a region possessing a well marked and distinctive fauna. In addition to these there are two others previously known which show the same zoögeographical relationships. These eleven species are : Sumbawa-Moluccas species. Japanese representative. Comaiulidcs australis . . • C. decameros Comantheria weberi ) _ . , ,. L. intcr media Comantheria rotula \ Eudiocrinus pinnahis E. variegatus. Cyllometra gracilis C. albopurpurea Tropiomctra afra (Hartlaub) T. macrodiscus Crossometra Jiclius C. septentrionalis Perissometra timorensis P. lata Strotometra parvipinna (P. H. Carpenter) . . . S. hepburniana Compsomctra iris . . . . ' C. serrata Nanometra elymenc A7. bowersi One species from the same region is most closely related to another from Oceania: Lesser Sunda Island species. Oceanic representative. Oceauomctra magna O. gigantea Another is closely related to a species from Oceania and another from southern China : Moluccan species. Oceanic and Chinese representatives. \ E. taliitiensis Enantcdon molitccana ( h. smensis One well known species from the Lesser Sunda Islands and northern Australia {Stephano- metra indicd) occurs otherwise at Ceylon and among the islands in the southwestern Indian Ocean, having been first described from Rodriguez. The very complete collections made by the "Siboga" at the Aru Islands have conclusively demonstrated that the crinoid fauna of those islancl is purely and typically Australian, differing widely from that of the islands to the west and northwest. ANNOTATED LIST OF SPECIES. THE COMATULIDS. ist- Suborder OLIGOPHREATA. I. Family Comasteridae A. H. Clark. Key to the Subfamilies of the Family Comasteridae. a1 Cirri present b1 the distal cirrus segments bear dorsal processes c1 ten or more arms; if there are more than 10 arms the divi- sion series may be all 2, in which case the first two bra- chials of the outer arms are united by pseudosyzygy and the second and third by syzygy ; or the IIBr series may be 4 (3 + 4) and the following series 3 (2 -f 3), in which case the first brachial of the f ree arms (and the first ossicles of the IIIBr and following division series) bears a pinnule, and there is a syzygy between the second and third brachials; in the rare cases in which the division series are very irre- gular the occurrence of a pinnule on the first brachial is diagrtostic Capillasterinae c" always more than 10 arms fexcept in the very young) ; some or all of the IIBr series 4 (3 + 4); following division series 4 (3 + 4) or 2 ; the second brachial of the free arms bears the first pinnule, and there is a syzygy between the third and fourth; in the rare cases in which all the division series are 2 the presence of a synarthry between the first and second brachials and of a syzygy between the third and fourth, and the presence of the first pinnule on the second, are diagnostic Comasterinae b3 all the cirrus segments smooth, without dorsal processes ; rarely more than 10 arms; if there are 10 arms the ossicles of the IBr series and the first two brachials may be united either by synarthry SIBOGA-EXPED1TIE XLII /'. rms the IIBr in the IBr series, tl„ instead ol 1 1 of 2 in the Comactiniinai .1 \ III .ml the following division series arms b( ai ■ a pinnule i ond and third ; the arms in number Capillasterinae : ilrsi pi 1 brachial ol' the free arms irms; the ossicles of the IBr series are nnitcd like the tirst two brachials; the IIBr series, win n present, exactly resemble the IBr series, and are always the presence <<( IIIBr series is very exceptional ; genital pinnules composed of relatively short and broad segments Comactiniin ae always more than io arms; one or more IIIBr series always present: IIBr series mostly, or entirely, 4 (3 + 4); if 2, the nponent ossicles are united by synarthry; IIIBr series 4 or 2. rarely 2 (1 +2); genital pinnules composed of longer and more slender segments Comasterinae Subfamily Capillasterinae A. II. Clark. Key to the Genera of the Subfamily Capillasterinae. .1 More than 10 arms the tirst pinnule of the free arms is on the first brachial, and there 1 the second and third; IIBr series 4 (3 + 4) I following ser ; occasionally the division series are 5 irregular brachials much broader than long, oblong or wedge-shaped ; ivering plates along the brachial and pinnule ambulacra 1 Africa to the Malay Archipelago and northern Australia, and northward to south- Capillaster triangular, about as long as broad, becoming elongate itally; brachial and pinnule ambulacra borde- Berm u da, F lorida and and southward to Brazil) . . Nemaster b* the first pinnule of the free arms is on the second brachial ; there is, at least on the outer arms, a pseudosyzygy between the first two brachials, and on all the arms there is a syzygy between the third and fourth ; all the division series 2. c1 brachials beyond the basal wedge-shaped, broader than long (sou thea stern Africa to the Malay Archipelago, northern Australia, the Philippines, the Caroline Islands and southern Japan) Comatella c3 brachials beyond the basal triangular, about as long as broad d1 cirri arranged in 25 closely crowded columns, usually of two each (K e i a n d P h i 1 i p p i n e 1 s 1 a n d s) . . . . Palaeocomatella d- cirri arranged in irregular rows (northw es ter n Africa and southwe stern Euro p e, and the Caribbean Sea) Neocomatella 10 arms b1 all the pinnules present c1 cirri moderate or slender, but never excessively so ; at least the last two segments no long-er than broad d1 first and second segments of the proximal pinnules with a very high and prominent carinate process of which the outer edge, at least on the second segment, is parallel with the longitudinal axis of the pinnule (Caribbean Sea and Gulf of Mexico) Leptonemaster d3 no carinate process on the basal segments of the proxi- mal pinnules e1 the pinnules of the first two to four pairs bear ter- minal combs ; the combs are confined to the distal half of the pinnules and are composed of triangular teeth which are not higher than the lateral diameter of the segments which bear them ; none of the seg- ments of the proximal pinnules are more than very slightly longer than broad ; there is no modification of the dorsal surface of the earlier brachials ; all of the brachials, and the pinnulars, have very spinous distal borders (e as ter n coast of Africa to the Malay Archipelago and the Philippine Islands) Comissia e3 terminal comb occurring only on the pinnules of the first pair (P1 and Pa) from one or both of which it is sometimes absent ; the comb usually arises about, or within, the proximal third of the pinnule, and tionally rounded teeth whi ally much • in height the lateral dia- in. nts which bear them; the fourth- hials bear prominent spinous median kn Is; usually • or more of the earlier nts of Pj twice as long as broad or longer ern United States) Comatonia ' Ij slender and thread-like, the enormously elon- with greatly swollen articulations ; the penulti- tent, which is much shorter than those preceding, is twice as long as broad; arms not more than 15 mm. in length LesserAntilles) Microcomatula ond, third and fourth pairs of pinnules are absent, so that there are no pinnules between P, and Pa, and 1' and Pe (south- t stern United States) Comatilia Comatella .\. II. Clark. k' y to the Species of the Genus Comatella. a1 Usually 26 — 30 cirrns segments; usually more than 40 arms; all the IIIHr series present, usually numerous IVBr, VBr and VIBr series, and sometimes VIIBr ries also; the inner branch from each [IBr series and its division resembles the outer (north Australia to the Philippine Islands) nigra a Not more than 25 cirrus segments; not more than 35 arms li' usually 20 — 25 cirrus segments; usually 30 — 35 arms; IlIIir series usually present on outsidë of rays only; the inner branch from each IIBr series usually remains undivided (Ceylon eastward to Australia and Oceania, reaching New South Wales, liji, Tonga, Samoa, the Philippine Islands and China) rtelligera li cirri with not more than 20 segments; usually 20 arms-, IIBr series usu- ally all, or nearly all, present, but rarely any further division [5 2'> cirrus segments (from the islands in the south we st- ern Indian Ocean eastward to northern Australia, New Caledonia, Rotuma, the Caroline Islands and Maccles- field Bank) maculata nol more than 1 ;, cirrus segments (southwestern fapan) . . . decora tata (P, II. Carpentei MS.) II .■■tl. [912, i 10, 11). pecimens from off ! ■ri.ln, in 120 fathom- (I ut. \ thoms 5 i. Comatella nigra (P. H. Carpenter). W. B. Carpenter. Proc. Roy. Soc, vol. 24, 1876, p. 451 (Actinometra nigra, Semper, MS.; anatomy). LUDWIG. Zeitschr. für wiss. Zool., vol. 26, 1876, p. 361 (Philippinische Comatnla; anatomy). P. H. Carpenter. Journ. Anat. and Physiol., vol. 10, 1876, p. 583 (Actinometra nigra, Sem- per, MS.; anatomy); vol. 11, 1876, p. 88, footnote (idem). VON Graff. Das Genus Myzostoma, 1877, pp. 17, 23, 72, 79 (Comatula nigra). P. H. Carpenter. Quart. Journ. Micros. Sci., vol. 21, 1881, p. 181 (Actinometra nigra, Semper, MS. ; anatomy). VON GRAFF. "Challenger" Reports. Myzostoma, 1S84, pp. 16, 20 (Actinometra nigra). P. H. Carpenter. "Challenger" Reports. The Stalked Crinoids, 1884 pp. 96, 110, 120, 121, 122, 124, 416; pi. 61, fig. 6 (Actinometra nigra; anatomy and arm sections). P. H. Carpenter. Ann. and Mag. Nat. Hist, series 5, vol. 19, 1887, p, 39 (Actinometra nigra ; vascular system). P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 304 (Actinometra nigra; first indications of specific characters). KüEHLER. Revue Suisse Zool., vol. 3, 1895, p. 293 (Actinometra nigra). PFEFFER. Abhandl. der Senck. naturforsch. Ges., vol. 25, 1900, p. 85 (Actinometra nigra). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 208. A. H. Clark. Proc. U. S. Nat. Mus., vol. 36, 1909, p. 395. A. H. Clark. Proc. U. S. Nat. Mus., vol. 39, 191 1, p. 530. A. H. Clark. Crinoids of the Indian Ocean, 191 2, p. 68, fig. 1, p. 69. REICHENSPERGER, Abhandl. der Senck. naturforsch. Ges., vol. 35, 19 13, part 1, pp. 82, 83. A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, N°. 15, p. 3. H. L. Clark. Carnegie Institution of Washington Publication N°. 212, 1915, p. 10 1. Stat. 43. Anchorage off Pulu Sarassa, Postillon Islands. Up to 36 Metres. 1 Ex. Stat. 99. 6°7'.sN., I20°26'E. 16—23 Metres. 1 Ex. Stat. 282. 8°25'.2S., i27°i8'.4E. 27—54 Metres. 1 Ex. Enkhuizen Island, near Batavia, Java. 1 Ex. The individual from Stat. 43 has 35 arms about 120 mm. long, and cirri XIV, 26 — 27, 25 mm. long. This specimen may almost equally well be referred to nigra or to stclligera ; in its habitus and in the details of its arm and cirrus structure it is intermediate between the two. The specimen from Stat. 99 is small, but typical ; it has about 65 arms which are about 100 mm. long, and cirri XVII, 27 — 32, moderately stout, 25 mm. to 28 mm. long. The example from Stat. 282 has about 70 arms; the cirri are robust, 30 mm. long, composed of 23 — 25 segments. The specimen from Enkhuizen Island has about 60 arms ; there may be as many as five axillaries exteriorly ; there are usually three interiorly; the cirri are XXXVIII, 23 — 26, large and robust, 25 mm. long. 2. Comatella stclligera (P. H. Carpenter). LÜTKEN. Cat. Mus. Godeftroy, vol. 5, 1874, p. 190 (Actinometra tenax, nomen nudum). P. H. CARPENTER. Journ. Linn. Soc. (Zool.), vol. 15, 18S0, p. 198, pi. 12, fig. 26 (Actino- metra stclligera). Bell. Proc. Zool. Soc. London, 1888, p. 389, footnote (Actinometra notata, nomen nudum). 1'. II. Cari i . ■in.itiil.n-, i, third luie from t"p of pi. 5, I 1'. 11. I IRPENTER. |. .uil), l.lllli. il. 21, 1889, p. ;, | 2, pi. Hartlaub. \. dei Ksl. I \k.ul. der Naturforsch., vol. 58, ii, N°. 1, p. ï Hnomttra I ... KOEHLER. Revi il., vol. ;. 1895, ;■. • inometra stel CHADW1CK. m Herdman, Ceylon Pearl Oystei Report . vol. _'. [904, Suppl. Report 11, p. i A. II. CLARK. Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, [909, p. A. 11. CLARK. Recent (ui. lustralia, 1911, p. 738. A. II. ('1 \i:k. Die Fauna Südwest-Australiens, vol. 3, 1911, part 13. pp. ; A. II. CLARK. Proc. U. S. National Museum, vol. 43, [912, p. A. 11. Cl \kk. Crinoids of the Indian Ocean, 1912, p. 1 A. II. CLARK. Smithsonian Miscellaneous Collections, vol. 60, mij, X . 10, p. 3. \. 11. Clark. Smithsonian .Mi ms, vol. 61, 1913, N . 15, p. 3. HENSPERGER. Abhandl. «Ier Senck. nat. Ges., vol. 35, 1913, part I, p. A. II. CLARK. Internationale Revue d uien Hydrob mul Hydrographie, 1 [i. 222. II. I.. CLARK. Carnegie Institution ui" Washington Publication N°. 212, 1915, p. 101. Stat. 89. Pulu Kaniungan ketjil. 1 1 Metres. 1 Ex. Stat. 96. Sulu Archipelago, southeastern side of the Pearl Bank. 15 Metres. 6 Ex. at. 99. <> ;.; \.. 1.' - I . 16—23 Metres. 2 Ex. Stat. ^22. Southern coast of Bawean [sland, i'j2 milessouth of Tandjong Lajar. 32 Metres. 1 Ex. The specimen from Si is small, with 30 arms. Of the examples from Stat. 90 the largesl has 43 arms 100 mm. long, and the cirri 22 mm. t" 26 mm. long with 2$ — 25 segments ; the dorsal pole of the centrodorsal is very slightly concave, 3.5 mm. in diameter; another has 43 arms about 85 mm. long, and cirri 20 mm. to 22 mm. long with 24 2') segments of which the eleventh, twelfth or thirteenth is a transition segment; a third is similar to the preceding with 35 arms 95 mm. long and cirri 2') mm. to 2; mm. long; a fourth has 33 arms 95 mm. long and cirri XX. 22 —24, 28 mm. to 20 mm. long; the ninth or tenth is a transition segment; a lilth lias 20 arms 80 mm long, being on the individual rays 8 (44 4), 1 1 3), 7 1 + 3 , 8 (3 + 5), and 2; the anal area of the disk is studded with scattered large rounded-conical concretions; the remaining specimen is young, with 12 arms 40 mm. long. Th Lmples belong to a variety of the species which p es more than the typical number of arms. and show-, great irregularity in the arm division. It was upon a spe- cimen of this variety that < based his name notata, though he failed t<> recognize the true afnnities of nis supposed new sp< and described it as closely related to Comatula The 1. imen from Stat. o belongs to the notata type; it has 37 arms (on the fivi 15 mm. long; the cirri are XXV, 25- 20 (usuallj mm. to 2; mm. long, mo the twelfth, thirteenth or fourteenth is a transition it; the smaller specimen lias 3] arms. 7 The individual from Stat. 322 has 33 arms 170 mm. long and cirri XVIII, 21 — 23, 25 mm. long; the ninth is a transition segment; the whole animal is large and robust. 3. Comatella maculata (P. H. Carpenter). LüTKEN. Mus. Godefiroy Cat., vol. 5, 1877, p. 100 [Actinometra fasca, nomen nudum). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 307, pi. 5, figs. ia — d; pi. 55, fig. 2 [Actinometra maculata). Bell. Proc. Zool. Soc. London, 1894, p. 396 [Actinometra simplex). BELL. Proc. Zool. Soc. London, 1S98, p. 849 [Actinometra sp.). BELL. Trans. Linn. Soc. (Zool.), series 2, vol. 13, 1909, part 1, p. 20 [Actinometra mitlti- radiata). A. H. CLARK. Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 138. A. H. Clark. Buil. du Mus. d'hist. nat. de Paris, 191 1, N°. 4, p. 246. A. H. Clark. Proc. U. S. National Museum, vol. 40, 191 1, p. 16. A. H. Clark. Recent Crinoids of Australia, 191 1, p. 739. A. H. CLARK. Notes from the Leyden Museum, vol. ^^, 191 1, p. 177. A. H. CLARK. Die Fauna Südwest-Australiens, vol. 3, 191 1, pp. 439, 443. A. H. Clark. Crinoids of the Indian Ocean, 191 2, p. 70. A. H. Clark. Smithsonian Miscellaneous Collections, vol. 60, 1912, N°. 10, p. 4. REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, part 1, p. 84. A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N°. 15, p. 3. H. L. CLARK. Carnegie Institution of Washington Publication N°. 212, 191 5, p. 101. A. H. Clark. Internationale Revue der gesamten Hydrobiologie und Hydrographie, 191 5, p. 222. Stat. 89. Pulu Kaniungan ketjil. 1 1 Metres. 2 Ex. Stat. 96. Sulu Archipelago, southeastern side of Pearl bank. 15 Metres. 1 Ex. Stat. 213. Saleyer, coral reef 1 Ex. The larger specimen from Stat. 89 has 22 arms 80 mm. long; the smaller, which is undergoing adolescent autotomy, has 2 1 arms. The example from Stat. 96 is quite typical ; there are 16 arms, and in addition a IIBr series ending in a pair of pinnules; the arms are 65 mm. long; the centrodorsal is thin dis- coidal, the dorsal pole flat, 3.0 mm. in diameter; the cirri are slender, XXI, 17 — 18, 9 mm. to 11 mm. long; the seventh or, more rarely the eighth, is a transition segment. The specimen from Saleyer is typical with 20 arms 90 mm. long. Palaeocomatella A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 18. Genotype. — Actinometra difficilis P. H. Carpenter, 1888. Diagnosis. — Post-radial structure as in the species of Neocomatella ; proximal cirrus segments, except the basal, elongated ; outer cirrus segments short and hearing dorsal tuber- cles as in Comatella ; centrodorsal large, circular, thin discoidal, the cirrus sockets in one and a partial second marginal row, but the second row, instead of alternating irregularly with the first as in all the other genera of the Comasteridae, is exactly beneath the first so that the cirrus sockets are arranged in columns, five to each radial area. I' II ( larpenti 1'. II. Carpenter. "Challengcr" R porl . I omatulai p. 93, pi. ;2. 1, 'inometra imi n trom Stat. 1 pulchell St.it N . 121 [9' E. 275 Mei 1'iu- centrodorsal is thin discoidal, circular, the large polar area flat, 3.0 mm. in dia- meter, with a slightly elevated rim ; the cirrus sockets are closely crowded, and are arra in twenty-five columns of t\\" rarely one) each. rhe nrri are about XXX. 10 11, 6 mm. long, the distal portion strongly curved; the lir^t segment is- verj short, the second nearly or quite twice as long as th<- median dia- meter and strongly constricted centrally, the third from three to tuur times as long as the median diameter, a transition segment, slightly constricted centrally with a swollen distal end; the fourth segment is from half again to twice as long as lts proximal dianv :panding evenly from the proximal to the distal end; the next two segments are about as long as the proximal diameter, and the remainder are slightly shorter than the proximal diameter: the fourth has a sligfht subterminal median dorsal tubercle: this on the next three segments gra- dually increases in size and moves to a central position; the opposing spine, though slightly er than the tubercle <>n the preceding segment, is very small ; it is subterminal and slurp: the terminal claw is twice as long as tin- penultimate segment, long, moderately slender, and moderately and evenly curved. The distal portion of the cirri is moderately compressed. The ends of the basal rays are visiblc as minute tubercles in the angles of the calyx. The radials are entirely concealed. The [Br, are concealed in the median line, but are parti- ally visible in the angles of the calyx; their lateral edges diverge from those of the adjacent IBr, at approximately a right angle; the axillaries are broadly pentagonal, twice as broad as long; the lateral edges are slightly concave, and the anterior angle is sharp ; they are widely separated from their neighbours ; the IIBr series are 2: the Illïr, are very short, slightly wedge-shaped, about four times as broad as the greater (outer) Iength, almost entirely united interiorly; the llbr axillaries) are broadly pentagonal, twice as broad as long, the lateral edges from one half to two thirds the Iength of those of the IIBr,. The union of the elenv nts of the II!r s<-ri'-^ and of the IIBr series is extremelv close, and with difficulty distinguishable from a pseudosyzygy. The 2m arms wen- probably about 50 mm. long; after the seventh the brachials become triangnlar, about as long as broad, with the distal e- i nc; \e. The l'irst syzygy is normally between brachials .; -,- .\ on the external arms. and 1 2 on the internal, but in many cases the first four brachials are grouped in two pairs, the firsl losyzygial, the second syzygial ; the brachials following the basal syzygial pairs as far as the seventh are wedge-shaped, with the anterior edges concave and slightly produced and spinotis. twice as broad as the median Iength. P, is '1 mm. long, very slender. composed of 35 short segments; the comb has 18 1 of which the distal to or \ \ are abruptly larger than those preceding, long. lance-shaped, than the lateral diameter of the segments which bear them. 1'. is 5.5 mm. long. much m ore slender, but otherwise similar. P3 is similar to P3, but slightly smaller and shorter. P is 3.5 mm. long with 17 segments of which the distal bear traces of a comb. P. is very small and slender, 3 mm. long, with 110 tracé of a comb. In the " Challenger" report Dr. P. H. Carpenter records (p. 304) under the name of Actinometra pulchella a somewhat anomalous specimen which was dredged near the Kei Islands (50 49' 15" S., 1 320 14' 15" E.) in 140 fathoms. Actinometra pulchella (now known as Neo comatella alata) is confined to the Caribbean region, and belongs to a genus, Neocomatella, which is exclusively Atlantic, its representative in the Indo-Pacific region being the allied Comatella. This specimen gave Carpenter considerable trouble ; at first he had believed that it represented a new species, and on p. 93 of the "Challenger" report he mentions it under 'the name of Actinometra diffJcilis, saying of it that "the two outer radials [i. e., the two elements of the IBr series], the two distichals [i. e., the two elements of the IIBr series] and the first two brachials are respectively united by syzygy." He refers to fig. 2 on pi. 52 as representing this specimen. The figure shows a much broken individual with about 1 8 arms ; the dorsal pole of the centrodorsal is circular, broad and fiat, 4.0 mm. in diameter ; there were apparently about XX cirri which are 13 mm. long with 16 segments of which the longest are over twice as long as broad, and the last eight are broader than long ; the brachials beyond the basal appear to be triangular, about as long as broad, judging from the regenerating arm in the upper right hand side of the figure. It is evident that Carpenter's specimen is very close to that just described, differing chiefly in the larger size, and in certain features such as an increased number of cirrus seg- ments and a relatively lesser length of the longer proximal cirrus segments, which are usually correlated with increased size. The apparent difference in the number of the cirrus sockets maj- or may not be real, on account of the indistinctness of the drawing. It seems reasonable, therefore to refer the "Siboga" specimen to the same species for which the name diffïcilis is available. With the arm structure of the Atlantic type [Neocomatella] this species possesses a very anomalous centrodorsal which is circular, and has the second row of cirrus sockets below the first instead of alternating with it as in all of the other genera of the Comasteridac. It appears most logical, therefore, to erect for the reception of this species a new genus, Palaeocomatella, most nearly related to the Atlantic Neocomatella, but differing markedly in its curious centrodorsal. Whether this disposition is the correct one must be left for future investioration to determine. *> Capillaster A. H. Clark. Key to the Species of the Genus Capillaster. a1 Cirri absent ; centrodorsal reduced to a small stellate plate lying within the radial circlet (Borneo and the China Se a) macrobrachius SIBOGA-EXPEDITIE XLI1<5. 2 nt. • ments . |.o 1 10 usually over 6< i arms. ital cirrus segments about ;is long as broad (Java Seal .... %racilicirra cirrus segments much broader than long (Maldive Islands tn western Australia and the Sunda [slands, the Moluc- . the Philippine I sla mis and Singapore sentosa nol more than 26 cirrus segments ; not more than 35 usually 15- 25) arms. c' outer cirrus segments slightly longer than broad (Java Sea . . tenuicirra :■ 1 cirrus segments broader than long. d1 rirri short and stuit, composed of 20 — 21 segments all of which are broader than long (Aru Islands clarki rirri longer and less stout, one or more of the proximal segments being longer than broad. arm length 160 mm.) ; division series perfectly smooth; rrus segments; entire animal mottled with whitish; disk without calcareous concretions (southwestern Japan) . mariae medium arm length very rarely over [2<5 mm., and never so much as 150 mm.); ossicles of the division series usually with finely spinous distal edges, so that the division series appear rough : no whitish mottling; disk usually with calcareous nodules more ur les-, developed. f1 larger, stouter and more robust : usually 15 -25 arms; IIIBr series often present : usually more than 23 cirrus segments (C e v 1 o n to western and northern Australia, and northward throughout the Malay Archipelago to the Caroline Islands, the Philippines and For- ni'i sa) multiradiata f small, slender and weak, with 12 — 19 arms IIIBr series never present; 21 — 23 cirrus segments (Madagascar) .... coccodistoma 1. Capillaster macrobrachius illartlaub). Hm '■ i der Ksl. Leop.-Carol. deutschen Akad. der Naturforscher, vol. 1891, N . 1. p. hm [Actinometra macrobrachius). \. 11. CLARK. Crinoids of the Indian Ocean, [912, p. 73. A. II. Clark. Smithsonian Miscellaneous Collections, vol. 6o, [912, X . to, p. 4. -.. 117 $6 I . Borneo Rank). 5e, Metres. 1 Ex. This specimen, which is much smaller than the type, has about 25 arms which are it 70 mm. long; three of the [IBr serii other thrt-e being 4 \-\ 4); the IIIBr .re all •■! one following a IIBr 2 series, which is 4 (3 + 4 . The centro- ti, thot tellate, has not as yet quite sunk to the level of the radials; it bears a few 1 I small pits, the remnants of cirrus sockets, on its margin. The colour is yellowish white, the pinnules being yellovv green. Except for the smaller size and the slightly less developed centrodorsal this specimen agrees well with. the type, with which it was directly compared. 2. Capillaster gracilicirra A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 18. Stat. 318. 6°36'.sS., II4°55'.5E. 88 Metres. 3 Ex. Stat. 320. 6°5'S., ii4°7'E. 82 Metres. 1 Ex. One of the specimens from Stat. 31S is a magnificent example of the species; it has 110 arms 140 mm. long; no fully developed cirri are preserved, but from the young cirri present it appears undoubtedly to be referable to this form instead of to C. sentosa which, except for the cirri, it exactly resembles. The other two are smaller, with 33 and 35 arms and cirri 35 mm. long composed of 28 — 36 segments. They seem to belong to C. gracilicirra rather than to C. tenuicirra, though they have not as yet acquired all of the characters of that type. The single individual from Stat. 320 has been chosen as the type of the species; the cirri are XVII, 27 — 35 (usually nearer the latter), 33 mm. long; the longest proximal cirrus segments are tvvice as long as broad, slightly constricted centrally with swollen ends ; the shorter distal segments are about as long as broad ; the tenth or eleventh is a transition seg- ment ; the eleventh or twelfth has several sharp spines on the distal dorsal border : in the following two or three segments the central spine rapidly increases in size, becoming a long subterminal dorsal spine, flanked at the base by a smaller one on either side. The other cha- racters are as in C. sentosa. There are 51 arms 100 mm. long. The smaller specimens from Stat. 318 are peculiar in having on the outer cirrus seg- ments two dorsal spines, a proximal and a distal. 3. Capillaster sentosa (P. H. Carpenter). Lamarck. Hist. nat. des animaux sans vertèbres, vol. 2, 18 16, p. 533 (Comatula multira- diata, part). J. MULLER. Abhandl. d. k. preuss. Akad. d. Wiss., Berlin, 1847 (1849), p. 261 (Comatula [Alecto] multiradiata, part). P. H. Cartenter. Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 521 (Actinometra multiradiata, part). P. H. Carpexter. "Challenger" Reports. Comatulae, 1888, p. 325, pi. 66, figs. 4 — 6 (Acti- 110 metra sentosa). Iv iehler. Mem. soc. zool. France, vol. 8, 1895, p. 421 [Actinometra sentosa). Bell. in Gardiner, Fauna and Geography of the Maldive and Laccadive Archipelagoes, vol. 1, 1902, part 3, p. 225 {Actinometra sentosa). A. H. Clark. Smithsonian Miscellaneous Collections (yuarterly Issue), vol. 52, 1908, part 2, p. 201 (Comaster sentosa). A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, p. 391 (Comaster sentosa). A. H. Clark. Vidensk. Medd. fra den naturhist. Forcning i K0benhavn, 1909, p. 133. A. H. Clark. Proc. U. S. National Museum, vol. 39, 191 1, p. 530. I J A. II. ii \kk. Huil. du Mus. d'hist. nat. de Paris, [911, X . |. p. A. II. 1 1 \kk. Crinoids ><\ the Indian Ocean, 1912, p. \. 11. 1 lark. Records "t the Indian Museum, vol. \ part ;. \ . 26, p. A. II 1 lark. Smithsonian Mi ■ ollections, vol. 60, [912, N . io, p. 4.. A. II. Clark. Smithsonian Mi ms, vol. 61, 1913, N . 15, p. 4. A. 11. Cl \kk. Records •■! the Western Australian Museum, vol. 1. [914, part 3, i». n< A. II. Clark. Internationale Revue der gesamten Hydrobiologie und Hydrographie, [915, p. Stat S., 117 j ( I . B01 neo B 1 ;.| Metn 1 Ex. Stat. 240. Band 1 Metres. 1 Ex. 2 .4 S., 123 1 .1 E. 34 Metres. 1 I \. The specimen from Stat. 70 luis about 80 arms [30 mm. long; the cirri are 35 mm. long with ments. The example from Stat. 299 lias 56 arms 110 mm. long; the cirri are 25 mm. t" mm. long with gments. TIn- individual trom Banda is small with 17 arms, and is undergoing adolescent auto- tomy; the Int posterior and left anterior rays are in process "f multiple division; the former ■nt' lIBr 4 series which bears internally a IIIBr ;, (2 3) series carrying two l\ Br ries; the latter has one lIBr 4 (3 + 4) series which bears a llllir 3 (2 + 3) series externally, anti a III Br 4 (3 1 series internally, the former carrying on the left (innermost side .1 [VBr ; (2 + 3) series. This is the first record in the genus of a 4 (3 + 4) series repla- cing a normal 3 12 + 3) series. The specimen is slender and delicate. 4. Capillaster tenuicirra \. 11. Clark. A. 11. Clark. Proc. Biol. Soc. Washington, vol. 25, [912, p. 18. Stal .; S., I31°3'.3E. 118 Metres. 2 Ex. St.it. 318. '■ 36'.5S., 114 5S'.S E. SS Metres. 14 Ex. Stat. 519.6 I'..; S.. 114 57 E. 82 Met.es. [ Ex. Stat. 320. 6°5'S., 1140; E. 82 Metn . 16 ] A specimen from Stat. 166 may be described as follows. The centrodorsal is thick discoidal, rather small, the bare polar area flat, 3 mm. in diameter: the cirrus sockets are arranged in a single irregular marginal row. The cirri ar< XII. 24—27, 25 mm. long; the tirst segment is very short, the second and third about twice as broad as the ventral length, the fourth half again as long as broad, the fifth twice as long as broad, the sixth resembling the fifth, the following gradually decreas- ing in length so that the tenth or eleventh and those following are very slightly longer than id; the sixth is a transition segment; the cirri taper slightly from the base to the middle of the transition segment, from that point onward being more slender and highly polished; from the transition segment onward 1 [ments have tin- distal dorsal edge slightly everted, forming a low and inconspicuous transverse ridge jnst within the distal dorsal border which is entic m end view, never becoming pointed; this is so low as to In- almost im- tible in lateral view. so that the cirri superficially appear quite smooth; the opposing 13 spine is very small, terminal ; the terminal claw is slightly longer than the penultimate segment, moderately slender, and moderately and evenly curved. The ends of the basal rays are just visible in the angles of the calyx, bridging over the narrow subradial clefts; the IBi-j are very narrow, trapezoidal, about five times as broad as long, entirely united laterally ; the IBr2 (axillaries) are very broadly pentagonal, twice as broad as long, free laterally ; the IIBr series are 4 (3 -f 4-)- There are 20 arms 110 mm. long; one of the IIBr series is absent, but a IIBr 2 series (the only IIBr series not 4 [3 + 4]) bears a IIIBr 2 series internally ; the brachials resemble those in young specimens of C. nmltiradiata ; the more proximal are obliquely wedge- shaped, almost triangular, half again to twice as broad as long ; the distal edges of the bra- chials are slightly produced, and are armed with numerous short fine spines. Syzygies occur between brachials 2 + 3, 13 + 14 to 30 + 31 (usually in the vicinity of the i5th), and distally at intervals of from four to eight (usually seven) oblique muscular articulations. The dorsal and lateral surfaces of the arms and division series are thickly beset with very fine spines, which are rather more prominent on the lateral surfaces. Pd is 15 mm. long with 30 segmerits ; the comb, which resembles that of C. multi- radiata, consists of from seven to nine well developed, and three or four rudimentary teeth ; the pinnule is comparatively slender; P1 is 14 mm. long, similar to Pd, but slightly more slender; P3 is 13 mm. long, similar to Px ; P3 is 10 mm. long, resembling the preceding ; Pt is 8 mm. long, with a comb; combs occur at intervals to the end of the proximal half of the arm. The mouth is submarginal, radial ; the anal tube is central ; the perisome of the disk is naked. Another specimen from Stat. 166 has 14 arms 100 mm. long and cirri XVI, 28 — 30, 28 mm. long; on some of the cirri the outermost segments bear dorsally a transverse ridge with a small but distinct spine in the centre; one of the IIBr series is 2, the remainder 4 (3 + 4). Of the fourteen specimens from Stat. 318 one has 10 arms, two have 11, three 12, one 13, one 15, three 16, one 23, one 25, and one 30 ; the largest and best developed example has 25 arms 125 mm. long, and cirri 35 mm. to 40 mm. long; the arms borne by the five rays are 4, 4, 3, 3, 1 1 ; the right posterior ray bears a IBr series ending in a tra- pezoidal ossicle from which four arms are given off, two, side by side, from its distal (longest) face, and one from each of the lateral faces ; this segment represents two normal IIBr axil- laries (with their derivatives) fused, and there is a faintly indicated median dividing line. An- other large individual has 23 arms 125 mm. long; of the nine IIBr series one is 2, one 1, and the others 4 (3 -j- 4) •, individual IIIBr series are all internal. The specimen from Stat. 319 has 32 arms 85 mm. long; on every ray one of the derivatives from the IBr axillary remains undivided so that 27 of the arms are borne upon five IIBr series. Of the examples from Stat. 320 two have 10 arms, two 12, two 13, two 14, one 17, one 18, two 21, two 22, one 23, and one 28; one with 21 arms has the anterior and right 1 1 anterior rays onlj about half th< I others, with 4 and 5 arms; there are three IHBr ill internali the arms are robust; the other with 21 arms has the arms distributed on the various ra; follows: 2, 5 (4+ 1); j one "f the IIBr . the other three bein . all the [IIBr serii only a single firriis is present, the centrodorsal approaching tin- condition of a sunken stellate plate; pne with :: arms 130 mm. long has one IBr series bearing two undivided arms, and three others with one divided and one undivided derivative; there are four internally developed [IIBr series, and two IIIBi m a single IIBr scn,-s; tin- only external [IIBr series is 2 instead the otl . the other with 22 arms has the two posterior ra_\s and their derivativi than hall' the size of the others; there are three [IIBr series, all internal, and all . tin- specimen with 23 arms has the right anterior arm very small, and tlu- anterior arm of about the same si/c ; tin- left anterior arm is slightly larger, and the normal; all tlu- small rays have four arms each, tin- right anterior and the anterior with two IIBr 2 series, and the left anterior with two IIBr 4 (3 + 4) -series; the [IIBr series are internal: the example with iS arms has four of the IIBr series 2. and four ; ; : . that with 17 arms has one ray with only IBr series, and on another ray an undi- vided arm springing from a [Br axillary; one of the specimens with 13 arms has on one ray two llllr 2 series one of whieh bears externally a IIIBr 3 (2 + 3) series; the other has one illl'.r series; one of those with 14 arms has three IIIBr series, two on a single IIBr series, the other externally developed; «me of the 12 armed individuals has one of the IIBr series 2, the other 4 t 3 . one of the 10 armed examples is of mature size. The specimen from Stat. ; : : is large, with [6 arms 125 mm. long; the cirri are rather small and slender, XVI, 21, 15 mm. to 17 mm. long. Extraordinary variability appears to be characteristic of this form ; the arms vary from 10 to 30 in number; the cirri are usually very slender with the distal segments longer than 1 and bearing single dorsal spines, but they may be stouter with the distal segments not longer than broad, in which case thej bear two dorsal spines, a distal and a proximal. 5. Capillastcr multiradiata (Linné). Gazophylacium, [716, pi. 4, li;^. o sttlla Ckineiisis perlegens). LlNCK. De Stellis Marinis, 1733, p. ;; [TptmxileKxxvefios). [ULZE. Betrachtung der versteinerten Seesterne, 1760, p. 17 decacnentos). I.i.nm. Syst. Nat., ed. to, 1758, vol. 2, p. ctinata, reference to Petiverj m multiradiata, type specimen at Iamd, upon which the description is based, but f the refcrences cited). A. J. Ri K. Svensk. Vetensk. Akad. Handl., vol. 4, Ai 1 7 - ;. p. 24 1 Asterias muliiradi Latham and Davis. Faunuia Indi multiradiata A. I. R tatio sistens species cognitas asteriarum, 1S05, p. tferias multi- lli-t. nat. des animaux sans vertèbres, vul. 2, [816, p. ; ; } [Comatula fimbri j. M . ' .handl. d. k. preuss. Akad. d. Wi . \sterias multiradt 1. M Abhandl. d. k. pn iss. Akad. d. Wiss., [847 Comatula [AUcto] fin \ multir 15 LÜTKEN. Vidensk. Medd. fra den naturhist. Forening i Kj0bcnhavn, 1871, p. 273 {Antedon fimbriatus). LÜTKEN. Cat. Mus. Godeffroy, vol. 5, 1874, p. 190 (Actlnometr a gracilis, nomen nudum). GRUBE. Jahresber. der Schles. Ges. für vaterland. Cultur, vol. 53, 1875, p. 75 {Comattrfa [Actinometra] borneensis). VON GRAFF. Das Genus Myzostoma, 1877, pp. 19, 20, 24 (Comatula fimbriata). P. H. Carpenter. Journ. Linn. Soc. (Zool.), vol. 15, 1880, p. 188 {Actinometra multiradiatd). Bell. Proc. Zool. Soc. London, 1882, p. 535 {Actinometra coppingeri, nomen nudum). P. H. CARPENTER. Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 521 {Actinometra multira- diata, part). Bell. "Alert" Report, 1884, p. 168, pi. 16, fig. B {Actinometra coppingeri). P. H. Carpenter. "Challenger" Reports. The Stalked Crinoids, 1S84, pp. 44, 52, 337 {Actinometra multiradiatd). VON GRAFF. "Challenger" Reports. Myzostoma, 1884, pp. 16, 19 {Actinometra fimbriata); p. 57 [Comatula fimbriata). P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, pp. 58, 317, 321, 366 {Actino- metra borneensis); p. 317, pi. 62, figs. 2 — 4 {Actinometra fimbriata); p. 320, pi. 60, figs. 1, 2 {Actinometra coppingeri); p. 321 {Actinometra stewartï); p. 322, pi. 66, figs. 1 — 3 {Actinometra multiradiatd). STUDER. Die Forschungsreise S. M. S. "Gazelle" in den Jahren 1874—6, III Theil, 1889, Zool. und Geol., pp. 194, 195 {Actinometra multiradiatd). Hartlaub. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, N°. 1, p. 10 1 {Actinometra coppingeri); p. 102 {Actinometra fimbriata); p. 103 {Acti- nometra m ultiradiata). NORMAN. Ann. and Mag. Nat. Hist., series 6, vol. 7, 1891, p. 386 {Aster ias multiradiatd). BATHER. Ann. and Mag. Nat. Hist., series 6, vol. 7, 1891, p. 464 {Asterias multiradiatd). BELL. Proc. Zool. Soc. London, 1S94, p. 394 {Actinometra multiradiatd); p. 396 {Actinometra fimbriata). KoEHLER. Mem. soc. zool. France, vol. S, 1895, p. 421 {Actinometra multiradiatd). LUDWIG. Abhandl. der Senck. nat. Ges., vol. 21, 1S99, part 4, p. 539 {Actinometra fimbriata). THOMPSON. Proc. Roy. Soc. Edinburgh, vol. 22, 1899, p. 322 [Actinometra multiradiatd). PFEFFER. Abhandl. der Senck. nat. Ges., vol. 25, 1900, p. 85 {Actinometra fimbriata; Act. coppingeri). BELL. in Gardiner, Fauna and Geography of the Maldive and Laccadive Archipelagoes, vol. 1, 1902, part 3, p. 225 {Actinometra multiradiata; Act. fimbriata). CHADWICK. in Herdman, Ceylon Pearl Oyster Report, vol. 2, Suppl. Rep. ir, p. 157 (Acti- nometra multiradiata). A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 201 {Comaster fimbriata); p. 202 {Comaster coppingeri). A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, p. 391 {Comaster multiradiata). A. H. CLARK. Zool. Anzeiger, vol. 34, 1909, p. 364. A. H. Clark. Vidensk. Medd. fra den naturhist. Forening i KObenhavn, 1909, p. 134. A. H. Clark. Buil. du Mus. d'hist. nat. de Paris, 191 1, N°. 4, p. 246. A. H. Clark. Proc. U. S. National Museum, vol. 39, 191 1, p. 530. A. H. Clark. Notes from the Leyden Museum, vol. 33, 191 1, p. 177. A. H. Clark. Recent Crinoids of Australia, 191 1, p. 736. A. H. Clark. Die Fauna Südwest-Australiens, vol. 3, 191 1, part 13, pp. 437, 439, 443, 444. 445- A. H. Clark. Crinoids of the Indian Ocean, 1912, pp. 74, 310. A. H. CLARK. Proc. U. S. National Museum, vol. 43, 1912, p. 386. A. H. Clark. Smithsonian Miscellaneous Collections, vol. 60, 1912, N°. 10, p. 4. REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, part 1, p. 84; p. 85 {Capillaster clarkï). A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1913, N°. 15, p. 5. A. II. Clark. i of the Western Australian Museum, vol. i. 19141 part 3, i>. 117. 11. L. Cl \kk. - Institution ol Wa hington Publication N . 212, 1915, p. 101. A. II. CLARK. Internationale Re\ nten Hydrobiologie und Hydrographie, [915, p Stat. 33. Ba) t. Lomb .il St.it. 37. Sailus ketjil, Paternostei Islands. 27 Metres and less. 1 Ex. Anchora I Pulu Kawassang, Paternostei Islands. < < >t.l1 Reef. 1 Kx. Stat. 47. Bay ol Bima, near south fort. 55 Metres. 1 I Stat. , E. (Sapeh Strail 1. 69 Mi tres. 5 Ex. coasl of Flores. \'\> t" 40 Metres. 3 Ex. Stal Samau Island. k< ef. 1 Ex. Stat. 90. 1 1 ■ ; \ . 1 . 281 Metres. 2 Ex. Pulu Sanguisiapo, Tawi lawi Islands, Sulu Axchipelago. 12 Metres. 1 Ex. Stat. ; N., 12 lö'E. Anchorage off North Ubian). 16 23 Metres. 10 Ex. Stat. 133. Anch iff Lirung, Salibabu Island. Up to ;6 Metres. 4 Ex. Stat. 144. Anchorage north of Salomakiëe (Damai 1 land. 45 Metres. 2 Ex. Stat. 162. Western Coast of Salawatti, between Loslos and Broken Islands. iS Metn St.it. 240. Banda. 9 36 M tn . 2 Kx. it. 250. Anchorage off Kilsuin, western coast of Kur Island. 20 — 45 Metres. 1 Ex. Anchorage off Pulu Jedan, eastern coast of the Aru Islands. 13 Metres. 8 Kx. Stat. 274. 5 28'.2S., I34°53 .>i 1-'.. 57 Metres. 1 Ex. Stat. 282. 8°25'.2S., 1271S.4K. (Anchorage between N'usa Besi and the northeastern point of Timor). 27—54 Metres. 1 Ex. Stat. 285. 8 39'. 1 S., 127 4.4 K. (Anchorage on the southern coast of Timor). 34 Metres. 1 Ex. - 294. [0°I2'.2S., I.'. E. 73 Metres. 4 Ex. Stat. 296. Anchorage off Noimini, southern coa t I imor. Coral Reef. 1 Ex. Stat. 299. 1 1.1I. (Buka or Cyrus Bay, southern coast of Rotti Island). 34 Metres. I Kx. The specimen from Stat. 33 has 20 arms 100 mm. long; all the II Br series are developed. The example from Stat. 37 has 19 arms; three of the eight IIBr series are 2; one of bears externally a IIIBr 2 series. < )n all the arms the first syzygy is between brachials 2 + 3. The specimen from Stat. |.o has 11 arms 90 mm. long. The individual from Stat. 47 has 20 arms 125 mm. long; the cirri are 22 mm. or 23 mm. long; the brachials are very short, discoidal, their distal edges strongly evertcd and abundantly supplied with short spines so that the animal feels very dry or rough; three ot the IIBr series are 2 and one, paired with one of 2, is i; the others are 4(3 + 41. Of the live examples from Stat. 49" the largest has 30 arms 100 mm. long; all of the interna! Illlir series are present, and all are ; 1 2 3); the loneest cirrus segments are not more than one third again . broad; the colour is deep violet, contrasting with the colour of the others, which are yellow brown, the smaller the lighter. Another example from this station has 19 arms 90 mm. long; two of the IIBr series are lacking; there is one IIIBr serii ternally developed. Of the other three individuals one has 1 3 arms 40 mm. long, and the others 11 arms 55 mm. and 50 mm. long. The three from Stat. of medium size: two have 18 arms; in one of these there . the third has 14 arms 80 mm. long. < >ne of the specimens from Stat. 90 has iS arms 105 mm. long; there are no IIIBr 17 series; the colour is nearly black; the other has 14 arms 105 mm. long; there are no IIIBr series; the colour is light brownish gray with a narrow band of very dark brown across every articulation. The example from Stat. 93 has 1 i arms 50 mm. long; the single IIBr series is just forming through adolescent autotomy. The details of the 10 specimens from Stat. 99 are as follows : (1) 26 arms 95 mm. long; all of the IIBr series are present, and all are 4 (3 + 4); the six IIIBr series, all inter- nally developed, are all 3(2 -j- 3); (2) 20 arms 90 mm. long; all the IIBr series are present, one 2, nine 4(3 +4); (3) 20 arms 70 mm. long; all the IIBr series are present, all 4(3 4- 4); (4) 20 arms 70 mm. long; all the IIBr series are present; (5) 20 arms 80 mm. long; all the IIBr series are present; (6) 12 arms 60 mm. long; the two additional arms are just appearing through adolescent autotomy; (7) 14 arms; (8) 14 arms; (9) 12 arms; (10) 10 arms. The largest specimen from Stat. 133 has 15 arms 85 mm. long; one of the IIBr series is 3 (2 + 3)1 the other four being 4 (3 + 4); another has 19 arms 70 mm. long; two of the IIBr series are 2, one of these bearing internally a IIIBr 2 series; a third has 15 arms, there being one IIBr series on each ray; the IIBr series are all 4 (3 + 4); the fourth specimen, which is small, has 1 1 arms. One of the examples from Stat. 144 has 18 arms, there being no IIBr series on one ray; the other has 17 arms 95 mm. long, and is evidently young. The individuals from Stat. 162 are small; one has 14 arms with all the IIBr series 4 (3 4- 4) ; the other has 13 arms with one of the IIBr series 2 and two 4 (3 + 4). The individual from Stat. 250 has 14 arms 50 mm. long and cirri XIII, 14 mm. long. The details of the eight specimens from Stat. 273 are as follows: (1) 25 arms 50 mm. long; of the five IIIBr series four are on two of the IIBr series, and the fifth is externally developed; the cirri are XVI, 23, 13 mm. to 15 mm. long; the longest cirrus segments are not over one third again as long as broad; (2) 18 arms 65 mm. long; there are no IIIBr series; the brachials are short triangular; (3) 16 arms 60 mm. long; the brachials are short triangular; the cirri are XX, 16 — 18, 10 mm. long; the longest cirrus segments are not more than one third longer than broad; (4) 15 arms 80 mm. long; the brachials are short triangu- lar; the cirri are XXIV, 17 — 21, 13 mm. long; the longest cirrus segments are about one third again as long as broad; (5) 15 arms 65 mm. long; the brachials are short triangular; there is one IIIBr series, 3 (2 -|- 3), internally developed; the cirri are XX, 16 — 19, 10 mm. long; the longest cirrus segments are not more than one third again as long as broad; (6) 15 arms 65 mm. long; the brachials are more nearly discoidal than in the preceding ; the cirri are XXII, 19, 12 mm. long; the longest cirrus segments are less than one third again as long as broad; (7) 14 arms 55 mm. long; the brachials are short triangular; the cirri are XXIV, 15 — 16, 10 mm. long; the longest cirrus segments are half again as long as broad; (8) 14 arms, small, undergoing adolescent autotomy; the longest cirrus segments are twice as long as broad; the disk bears about twenty-four large conical calcareous tubercles irregularly scattered over the anal area, and many small calcareous nodules on and at the base of the anal tube. SIBOGA-EXPEP1TIE XL1 3 i8 Th imen from Stat. 274 has mis iio mm. long; there are four IIIBr series nt, three interna! and «me external, paired with one of the internat; the < irri are Wil. mm. long; the longest cirrus segments are about a third again as long as broad, rhe example trom Stat. 282 has 20 arms. liit- individual trom Stat. 285 is ver) small with 10 arms. Of the four from Stat. 294 the largesl has 1 | arms 35 mm. long; all of the IIBr ther has 11 arms 35 mm long; the single IIBr series is 4 (3 + 4); the other two have n 1 arms Th imen trom Stat. 299 has [9 arms 80 mm. long; there are no IIIBr series-, the cirri are Wil. 1 15 mm. long. the two from Banda the larger has aboul 26 arms about 105 mm. long; three of nes are 2; the IIIBr series are 3 (2 -f- 3); the cirri are XV, 24 — 26, 22 mm. tO mm. Ion-, rhe very tïne example from the reef at Haingsisi has 20 arms [40 mm. long; all ot the IIBr series are present, and all are 4 . the cirri are XIII, 20— 21, 15 mm. long; the longest cirrus segments are not more than one third again as long as broad; the anima! i> verj robust: the brachials are very short with strongly produced distal edges. From the coral reef at Noimini Stat. 296) there is a small specimen with 15 arms; of the IIBr series is 2. Dr. Reichensperger has recently described, under the name of Capillaster clarki, a of this genus from the Aru Islands based upon two specimens dredged l>y Dr. near 1'ulu Bambu in 10 metres: the cirri of the supposed new form are XXVIII — XXXIV, 20—21, 15 mm. long, stout, the longest segments (fifth-seventh ) slightly longcr than broad; the arms are 27 — 35, 85 mm. to [OO mm. long. The essential character of Capillaster clarki is the shortness of the proximal cirrus lents. The numerous specimens from the Aru Islands in the "Siboga" collection are for the most part characterized by rather unusually short cirrus segments, but as a similar shor- tening ot the longer proximal cirrus segments is not infrequent in examples of the species trom other localities I de not believe that C. clarki can be maintained as a separate form. The smaller ot Dr. Reichensperger 's two specimens has highly irregular division series, as in tin- type of C, mariae. Hut this same extraordinary irregularity is occasionally found in imens of C. multiradiala, and, rather more commonly, in the large species of the alli' - Nemaster which represents Capillaster in the Atlantic Th- trmed young of this species may be distinguished from those of the species of mianthus by the long and slender cirri with a slight distal taper which, as commonly found, are nearly or quite straight. The cirri of the young of the species of Comaster and Coma nt lm shorter with fewer segments, and the .listal half is always strongly irved. 19 Comissia A. H. Clark. Key to the Species of the Genus Comissia. aT 25 — 30 cirrus segments; dorsal surface and distal edge of the pinnule segments very spinous; arms 100 mm. to 120 mm. long; cirri 15 mm. to 20 mm. long (P h i 1 i p p i n e I s 1 a n d s and M a c c 1 e s f i e 1 d Bank) peregrina v) a2 Not more than 25 cirrus segments b1 16 — 25 (usually 18 — 25) cirrus segments of which the longest are from half again to tvvice as long as broad ; arms 70 mm. to 100 mm. long ; cirri 15 mm. to 17 mm. long; pinnule segments not so spinous as in the pre- ceding (Philippines to the Lesser Sunda and Kei Islands). . lütkeni \r not more than 1 6 cirrus sesrments o c1 14 — 16 cirrus segments d1 longest cirrus segments from three to four times as long as broad ; cirri XVII, 14 — 15, 10 mm. long, arranged in two irregular rows on the centrodorsal ; ossicles of the division series with slightly pro- minent and finely spinous distal ends ; brachials with strongly over- lapping and very spinous distal edges ; arms 55 mm. long (Philippines) horridus") d- longest cirrus segment not more than twice as longf as broad e1 cirri arranged in three closely crowded marginal rows ; YY with a comb of about 25 exceptionally long teeth ; Pt with a comb of 15 or 16 teeth; arms about 90 mm. long; cirri 14 mm. long (Christ- maslsland) pectinifer e2 cirri in a single marginal row ; Pl with a comb of 9— ru teeth; P8 and the following pinnules without combs ; arms about 60 mm. long; cirri 10 mm. to 11 mm. long (Moluccas) littoralis c2 not more than 14 cirrus segments d1 arms about 60 mm. long ; cirri arranged in a single marginal row e1 12 — 14 cirrus segments of which the longest is from two to two and one half times as long as the proximal diameter (Ceylon) chadwicki e2 9 — 10 cirrus segments of which the longest is about four times as long as the proximal diameter (Kei and Philippine Is- lands) • . hispida d2 arms not more than 45 mm. long e1 more than XX (XX — XXX) cirri, which are from 7 mm. to 9 mm. long; arms 45 mm. long f1 ossicles of the division series, brachials and pinnulars with strongly produced distal edges, which are armed with prominent 1) Synonym Comissia dumetum A. H. Clark. 2) Comaster horridus A. H. Clark. Proc. L'. S. National Museum, vol. 39, 191 1. p. 533. spines L< Sundalslands) spinosissima i t the division series smooth, and not pro ol the brachials .nul pinnulars not unusually is Philippine to the Lesser Sunda Islands . . parvula than XX cirri, which are 4 mm. t" 6 mm. long; arms 30 mm to 10 mm. long XV XX cirri; distal cirrus segments elongate, the antepenul- timate being half again as long as broad and the penultimate about as long as broad Kei Islands) gracilipes VIII - XV cirri; antepenultimati lenl only slightly, when al all, longer than broad cirri VIII XIV (usually about X), 10 — 1 3 (usually 12-- 1 fourth longesl cirrus segment from three and one half to four limes as long as the median diameter (Red Sea . . hartmeyeri cirri XII— XV, g 11 usually 10 — II); fourth (longest) cir- rus segment about three times as long as the median dia- meter (Amirante and Seychelles Islands, off sou th- > t e r n A f r i c a) ignota 1. Comissia lütkeni A. ii. Clark. A. II. CLARK. Proc. LJ. S. \;itional Museum, vol. 36, 1909, p. 502. Stat. 260. 5°36'.sS., 1 320 53.2 II. 90 Metres. 1 Ex. Stat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 2 Ex. The specimen from Stat. 260 bas the arms about 100 mm. long and the cirri XIV, 25, about 15 mm. long, The larger example from Stat. 305 has the arms about 100 mm. long and the cirri XIX, 21 — : i.illy 22— zy\ 17 mm. long ; the fourth is a transition segment; the distal intersyzygial interval is three oblique muscular articulations. Tbc other specimen is similar, but slightly smaller: the single complete cirrus bas 20 segments of which the fourth is a tran- sition segmi All three of these specimens are considerably larger than the two from which the spe- originally described, though otherwise resembling them. 2. Comissia hispida A. II Clark. A. II. CLARK. l'n>c. I". S. National Museum, vol. 39, 1911, p. 531. ] Metres. 1 Ex. arms of this specimen are about 60 mm. long; the cirri are XIII, 10 — 11 (usually mm. long; the dorsal pole of the centrodorsal is 2.5 mm. in diameter. The longest 2 I cirrus segments are very slightly less elongate than in the type specimen, but I can find no other differences. 3. Comissia littoralis A. H. Clark. A. H. CLARK. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 18. Stat. 129. Anchorage oft" Kavvio and Kamboling Islands, Karkaralong group. Reef. 2 Ex. The centrodorsal is very thin, discoidal, the broad dorsal pole fiat, 2.5 mm. to 3.0 mm. in diameter; the cirrus sockets are arranged in a single crowded and more or less irre- gular marginal row. The cirri are XXI — XXII, 16, 10 mm. to 11 mm. long; the first segment is short, the second about twice as broad as long, the third about half again as long as the proximal diameter, the fourth about twice as long as the proximal diameter or slightly longer, the fifth about as long as the fourth or slightly shorter ; the following rapidly decrease in length, beco- ming after the eighth or ninth slightly broader than long; the fifth and following have a slight subterminal dorsal tubercle which gradually moves anteriorly, becoming median after the ninth; the opposing spine is very small, subterminal. The earlier longer segments are slightly con- stricted centrally with prominent ends ; the distal shorter segments are laterally compressed and therefore appear broad. The ends of the basal rays are visible as small tubercles in the angles of the calyx; very narrow subradial clefts are present; the radials are concealed ; the IB^ are concealed except in the angles of the calyx where their lateral edges diverge at an angle of 900; the axillaries are almost triangular, twice as broad as long; the lateral edges are very short, ma- king an obtuse angle with those of the IBr,. The division series and arm bases, which are quite without synarthrial or articular tubercles, extend outward at right angles to the dorso- ventral axis ; this, with the broad flat centrodorsal carrying a single row of cirri, gives the animal a singularly fiattened habitus in contrast to peregrina and lütkeni in which the division series and arm bases make a slight angle with the plane perpendicular to the dorsoventral axis. In this respect C. hispida is intermediate between littoralis, and peregrina and lütkeni. The ten arms are about 60 mm. long, and slender. Fl is considerably longer and stouter than the succeeding pinnules, and bears a comb with 9 — 11 teeth ; P„ and the following pinnules are without combs. Seven pentacrinoid larvae were attached to the cirri of these two specimens. 4. Comissia spinosissima A. H. Clark. A. H. CLARK. Proc. Biol. Soc. Washington, vol. 25, 19 12, p. 20. Stat. 305. Mid-channel in Solor Strait, oft" Kampong Menanga. 113 Metres. 2 Ex. The centrodorsal is large, thin discoidal, the dorsal pole fiat, regularly pentagonal, 2 mm. in diameter. The cirri are XXX, 10 — 11, 8 mm. long, small and slender, with the distal edges of the lirst segment is very short, the 'second third tli*- longest, about tour times as long as the as the third, but, the -listal end is tnon panded distal end ; the following gradually deer in |< ihimate is about as long as broad; the second and third segments ends considerablj enlarged, and are slender and broadly lurth has the proximal end only very slightlj enlarged, but gra- the distal edge, which is produced and overlaps the base nent; the following segments gradually increase in lateral diameter, the radually decreasing in extent; the fifth and following segments ninal tubercles; the opposing spine is terminal, minute, but larger than the the preceding segment; the terminal claw is nearly twice as long as the penulti- and is ly curved. I in the median line, but are slightly visible in the angles of the IBr, are very short, oblong, live or six times as broad as long, very closely 1 with the ling axillary, which is triangular, twice as broad as long arms are 45 mm. long; the brachials resemble those of C. hispida. The ossi livision series and the brachials have their distal borders armed with very long fine spines; the segments of the pinnules are exceedingly spinous and the third has a slight, very spino rination. second specimen is smaller, but otherwise resembles the one described. 5. Com •acilipes A. II. Clark. .\. II. CLARK. Proc. Hiol. Soc. Washington, vol. 25, 1912, p. [9. . 266. 50 56.58., i32°47'.7E. 595 Metres. 6 Ex. •7. 5°54'S., I32°56'.7E. 984 Metres. 2 Ex. The largest of the six specimens from Stat. 266 has the arms 40 mm. long; the cirri Il lost . The larger example from Stat. 267 has been chosen as the type; the centrodorsal is 1 lal, with a broad flat dorsal pole 2. mm. in diameter; the < irrus sockets are arran- very closely crowded marginal row. The cirri are lacking; but in the smaller specimen the cirri are XX. in one and a part; id row. the latter apparently undergoing suppression; there are also traces of the third row. The cirri have 9 segments and are from 4 mm. to 4.5 mm. long; the irly or quite twice as broad as long, the second is slightly longer than third is about three times as long as the diameter of the proximal end, the fourth ;htl\ rid the fifth is about as long as the third; the sixth is about twice as long istal end; the seventh is slightly shorter; the antepenultimate is half tnd the penultimate is about as long as broad. The longer earlier 23 segments are slightly constricted centrally vvith expancled ends as is usual in the genus. The dorsal processes on the outer segments are almost obsolete. The ten arms, which resemble those of C. parvtila, are between 30 mm. and 35 mm. long. The mouth is central or subcentral, the anal tube marginal or submarginal. Pj is 7 mm. long and bears a terminal comb consisting of 1 1 long teeth. 6. Comissia parvula A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 191 2, p. 19. Stat. 95. 5°43'.5 N., 1 i9°4o' E. 522 Metres. 1 Ex. Stat. 105. 6°8'N., 1210 19' E. 275 Metres. 5 Ex. Stat. 294. io°i2'.2S., I24°27'3. E jt, Metres. 2 Ex. Stat. 302. io°27'.9S., I23°28'.7E. 216 Metres. 2 Ex. Label not legible. 1 Ex. The centrodorsal is large, discoidal, the dorsal pole flat, 2 mm. to 2.5 mm. in dia- meter; the cirrus sockets are in two marginal rows. The cirri are XX — XXIII, 9 — 13 (usually 11), 7 mm. to 9 mm. long, resembling those of C. kispida but slightly more slender. The arms are slender, 45 mm. long. The specimen from Stat. 95 has the cirri about XX, 11, 7 mm. long; the dorsal pole of the centrodorsal is 2 mm. in -diameter. The largest example from Stat. 105 has the cirri XXII, 10 — 11, 7 mm. long; the dorsal pole of the centrodorsal is 2.5 mm. in diameter; the ovaries contain mature, or almost mature, eggs. The four others are very small. The specimens from Stat. 294 .have cirri with 10 segments, 6 mm. long; the arms are 45 mm. long. Those from Stat. 302 have 9 — 11 cirrus segments, and resemble the preceding. The individual with the label illegible has the cirri XXIII, 11 — 13, 9 mm. long; the dorsal pole of the centrodorsal is flat, 2 mm. in diameter; ripe eggs are present. The arms are 45 mm. long. In addidion to the specimens detailed above I have at hand the following: Tawi Tawi group, Philippine Islands, 230 fathoms ("Albatross" Stat. 5162; Cat. N° 36003 U. S. National Museum). Doworra Island, Moluccas, 205 fathoms ("Albatross" Stat. 5629; Cat. N° 36019 U. S. Natio- nal Museum). This species is very close to C. kispida, but is smaller, more delicate, and more slen- der; the cirri, while resembling in structure those of C. kispida, are arranged in two rows instead of in a single row on the centrodorsal, and are more slender and more numerous. The very small specimens of the species of this genus may be distinguished from the ten armed young of multibrachiate species by the very short IBr series the elements of which appear to be united by syzygy. 1 mactin iinae .\ . II. Clark. • if the Subfamily ( !omactiniinae, Australia and the Aru Islands) Validia (subg.) ept the southern coast , and Udaman Islands, Singapore, Hong- r and the Ph ilippines) Comatula (subg.) cirrus segments which, excepl the penultimate, are twice as broad as long, or even broader (southern Australia) Comatulella Man 25 cirrus segments of which at least some, and com- monly all, r than broad [Br series short and very broad and, usually with the first tuu brachials, in lateral apposition; segments of the nital pinnules short and broad (usually much broader than long in the basal half of the pinnule) and more or less pro- duced distall\-. only exceptionally more than XX cirri, which are usually short and rather stout d1 ossiclcs of the II ir series and first two brachials united by pseudosyzygy, the union appearing externally as a uniformly narrow, or dotted, line; two or more of the basal segments of the proximal pinnules usually bear a prominent carinate process Australia, excepting the southern coast. and northward t o the A n d a m a n I s 1 a n d s , Singapore, H ongk o n g a n d the Ph il ippine Islands) Comatula dJ ossicles of the IBr series and first two brachials united by synarthry, the line of union appearing externally as two very narrow triangles converging to a common apex in the median line; no carinate processes on the basal segments of the proximal pinnules western Atlantic, from North Carolina to Brazil, including theCaribbeanSea Comactinia the IBr series longer and narrow, widely free laterally; segments of the genital pinnules beyond the first two as long as. or longer than, broad; XXIV— XL cirri, which nder, and strongly compressed laterally . Islands and southwestern Japan Comatulides Comatula Lamarck. Subgenus Validia A. H. Clark. Key to the Species of the Subgenus Validia. a1 All of the arms the same length (northern Australia and the Aru Is- 1 a n d s) rotalaria a2 The outer arms arising from each IIBr series are much shorter than the inner (northwestern Australia and the Aru Islands) etheria i. Comatula f Validia) rotalaria (Lamarck). Lamarck. Hist. nat. des animaux sans vertèbres, vol. 2, 18 16, p. 534. P. H. Cari'ENTER. Proc. Roy. Soc., vol. 28, 1879, p. 390 [Actinometra jukes Bell. "Alert" Report, 1884, p. 168 [Actinometra jukesi); p. 169, pi. 17, figs. A, Ka [Acti- nometra paucicirrd). BELL. Proc. Linn. Soc. New South Wales, vol. 9, 1885, p. 498 [Actinometra jukesi). P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 291, pi. 4, fig. 6; pi. 5, fig. 3 ; pi. 54 [Actinometra paucicirra and Act. aruensis). DÖDERLEIN. Denkschr. Ges. Jena, vol. 8, 1898. p. 479 (Actinometra paucicirra). A. H. Clark. Buil. du Mus. d'hist. nat., Paris, N" 4, 1911, p. 247. Die Fauna Südwest-Australiens, vol. 3, 191 1, part 13, pp. 437, 440, 443 — 445. Recent Crinoids of Australia, 191 1, p. 739. Crinoids of the Indian Ocean, 1912, p. 79. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 8. REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 191 3, Heft 1, p. 83. A. H. CLARK. Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1915, p. 224. Stat. 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 13 Metres. 1 Ex. This is a particularly fine specimen with 20 arms 165 mm. long, the posterior arms being 1 20 mm. long ; all of the arms are grooved ; the centrodorsal exactly fills the space between the radials, its surface being on precisely the same level as theirs so that its borders are difficult to detect. 2. Comatula (Validia) etheridgei A. H. Clark. A. H. Clark. Recent Crinoids of Australia, 191 1, p. 741. Die Fauna Südwest-Australiens. vol. 3, 191 1, part 3, pp. 440, 444, 445. Crinoids of the Indian Ocean, 191 2, p. 79. Smithsonian Miscellaneous Collections, vol. 61, 1913 X" 15, p. 8. Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1915, p. 224. Stat. 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 13 Metres. 5 Ex. The largest specimen has the inner arms 45 mm. long and the longest outer arms 20 mm. long ; some of the outer arms are not so long as the pinnules which they bear ; these SIBOGA-EXPEDITIE XI.Il/'. 4 wlii.li de< • apidly in diameter and do fourth segment of the first pinnule; the cirri are VII, all tli. ents are subequal, rather more than half again th« cirri are confined to the interradial angl( I in t\\( with one al each of the remaining three angle \ second specimen has the inner arms (.o mm. long and the outer up to 30 mm. in length; the cirri are VIII, in four interradial pairs. A third has the inner arms 40 mm. long and the outer up to 11 mm. in length; the the Species of the Subgenus Comatula. irri- r arms more than 100 mm. msually from 125 mm. to 150 mm. in length northern Australia t<> western Java, Singapore, Hong Kong and the Philippine Islands) , solarü ver) stout and flat dorsally, increasing in lateral diameter Ifth-fourteenth brachials and tapering distally from that point rthern Australia] , var. solaris and well rounded dorsally, not increasing appre- er from the base northern Australia to west- po re, Hong Kong and the Philippine Is- var. hamata . ' |. M 27 b2 anterior arms not more than 65 mm. long (Burma to the Andaman and Lesser Sunda Islands) micraster Cirri present b1 16 — 25 (usually about 20) cirrus segments (northern Australia to western Java, Singapore, Hong Kong and the P hilippine Islands) solaris c1 the arms are very stout and flat dorsally, increasing in lateral diameter to the twelfth-fourteenth brachials and tapering distally from that point onward (northern Australia) var. solaris C the arms are slender and well rounded dorsally, not increasing appre- ciably in diameter from the base (northern Australia to west- ern Java, Singapore, Hong Kong and the Philippine Is- lands) var. hamata ba fewer than 1 6 cirrus segments c1 the cirri are distributed, regularly or irregularly, all around the peri- phery of the centrodorsal, without segregation in the interradial angles (Baud in I si and, Western Australia, and New South Wales to Singapore and the Philippine Islands) pectinata Y) c3 the cirri are segregated in the interradial angles of the centrodorsal, where they occur singly or in pairs d1 the longest cirrus segments are not much, if at all, longer than broad (western and northern Australia to the Philip- pine Islands) pur pur ca d2 the longest cirrus segments are twice as long as broad (Java Sea) tcnuicirra 1. Comatul a (Comatula) micraster A. H. Clark. A. H. Clark. Crinoids of the Indian Ocean, 1912, p. Si, fig. 2, pp. 82, 315. Stat. 33. Bay of Pidjot, Lombok. Up to 22 Metres. 1 Ex. This is a typical specimen; on the label is written "killed in fresh water." 2. Coma t 'itla (Comatula) purpurea (J. Muller). J. MULLER. Archiv für Naturgesch., 1843, I, p. 132 (Alecto purpurea). A. H. Clark. Proc. Biol. Soc. Washington, vol. 23, 1910, pp. 95 — 98, fig. p. 97. Buil. du Mus. d'hist. nat., Paris, 1911, N° 4. p. 247. — ■ — Recent Crinoids of Australia, 191 1, p. 746. Crinoids of the Indian Ocean, 1912, p. Si. Smithsonian Miscellaneous Collections, vol. 60, 1912, N° 10, p. 5. Proc. U. S. Nat. Mus., vol. 43, 19 12, p. 3S9. REICHENSPERGLR. Abhandl. der Senck. naturforsch. Ges., vol. 35, 19 13, part 1, p. 86. A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 9. Records of the Western Australian Museum, vol. 1, 19 14, part 3, p. 120. 1) Synonyms Comatula cumingii J. Muller and Aclinometra affinis Lütken. 28 II hington L'ublication, . 191 j>, p. 101. ten Hydrobiologic und Hydrographie, 19] M -i md 1( i Ex. I • ! | I ■. 1 1 im 11 [sland. Reef. 1 1 tem coast ol Kui I sland. 21 1 45 Metres. 1 Ex. Pulu J .t.111 o the Aru [slands (Pearl Banlu . 13 Ex. . i . , i 1 1 Ex. 2 Ex. il. 34 Metres. i.| •, . .■ I 1 Ex. 'ii.iii [sland. Reef. 4 Ex. ; S., 1 1 , 55'.5 E. 88 Mei Ex. the specimens are .is follows : typical example with arms 55 mm. long. smal! specimens of which the largest has arms 25 mm. long, and cirri VI. 1 rom the reet' at Lamakera (Stat. 61) there is a very small example with the arms only mm. I01 two small individuals with arms 30 mm. long and cirri X, in five interradial pairs. it, 144; a small specimen with the arms 45 mm. long, and V cirri; the interradial the visceral mass proximal to P, are filled with calcareous deposit. . a small example with arms 35 mm. long; the cirri are IX, very slender; the disk has 1 ost, but the interradial areas proximal to the bases of the P, are filled with a stp webbin ,t. ^7;: a four-raj :cimen from this station lias the anterior arms 70 mm. long, being 45 mm. long; the cirri are VI, four arranged in two interradial ■her twi rring singly; the anterior ray is missing; the mouth is slightly to the the left derivative from the ray just to the right of it; the arm at the left of tl th and the three to the right are grooved; the other four are ungroovi A th arms aboul 70 mm. long, four ol them ungrooved, lias the cirri VII. Another individual i tbout 55 mm. long, and stout; five arms are grooved cirri are VII, arranged in two interradial pairs, with three occur- disk is regenerating, and the course of the digestive tube is shown by a nal i one. the anterior arms 55 mm. long and the posterior 35 mm. long; and six ar< ed; the cirri are V, in one occurring indivi- le, in the other absent from one of the interradial angles with arms 50 mm. long has the cirri VI, four arranged in two interradial individually ; one of the interradial angles is vacant. 29 Another with the anterior arms 50 mm. long and the postenor arms 30 mm. long has the cirri V, one in each interradial angle; there are four ungrooved and six grooved arms. A small individual with arms 30 mm. long has V cirri. A still smaller one with arms only 15 mm. long has the cirri VIII, arranged in two interradial pairs with three occurring individually. There are fourteen specimens additional similar to the preceding, and two very small. Stat. 274; two large individuals with the arms moderately swollen. Stat. 282; the largest example has arms 60 mm. long and cirri II; four have arms 45 mm. long and cirri III, III, IV and VIII; one has arms 30 mm. long and cirri VI; there are eighteen others. In another lot from the same station there are seventeen specimens with arms ranging from 12 mm. to 40 mm. in length; most of them have V cirri, one in each interradial area ; the smallest has VI cirri arranged in two interradial pairs with two occurring individually, one of the interradial anodes beingf vacant. From Stat. 285 there are two small specimens. Stat. 299; the largest specimen has arms 45 mm. long and cirri V; three others have arms 40 mm. long and cirri III, V and VIII; another has the arms 35 mm. long and the cirri V; there are nine others. A small example from the reef at Stat. 301 has the arms about 40 mm. long and the cirri IX, two being very small. The largest individual from the reef at Haingsisi (Stat. 303) has the anterior arms 85 mm. long and the posterior 50 mm. long; the cirri are II, but there are sockets for four more; another has the anterior arms 80 mm. long and the posterior 45 mm. long; the cirri are III ; the two additional specimens are small. The larger specimen from Stat. 318 has eleven arms 125 mm. long; the arms are of the slender type and, except for the arrangement of the cirri, the animal bears a close resemblance to that upon which Lütken. based the name affinis\ the cirri are VI, four in two interradial pairs and two occurring singly. The smaller example has ten arms 85 mm. long: the cirri are VIII, two occurring singly, the remainder in three interradial pairs. 3. Comatula (Comatula) tenuicirra A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 19 12, p. 20. Stat. 320. 6°s'S., U4°7'E. 82 Metres. 8 Ex. This species exactly resembles the slender armed form of C. (C.) pitrpurca except for the lon^er and more slender cirri. o In the largest specimen, which has the anterior arms 125 mm. long (the posterior arms are broken), the cirri are IX, 14 — 15, 13 mm. to 15 mm. long; they are arranged in four interradial pairs, with one occurring singly; the first segment is short, the second nearly as long as broad, the third from one third to one half again as long as broad, the fourth and iifth twice as long as the median diameter; the following segments gradually become slightly shorter so that the third before the antepenultimate is about one third longer than broad, the next as long as broad, and the penultimate ver) slender, of the same type as the slender form I ond and third segments of the proximal pin- lllll' has the arms 80 mm. long and the i-irri V; a nother cirri VII; a third lias the arms 50 mm. long and the cirri IV m. and 35 mm. long and the cirri \ . the remaining two examples are extremely delicate, brown; some ,oi the specimens have a line of dnll purpli line, and one in addition has a spot of purple on each of the pin:. 4. c Comatula pectinata (Linn 5yst Vit., io'h edition, 1758, p. 003 [Aster ias pectinata; type specimen, but n<>t the references ciu ■ s J. MULLER. Abhandl. d. k. preuss. Akad. d. Wiss., 1847 (1849), p. 255 [Comatula cumingii). P. H. CARPENTER. Trans. Linn. Soc. Zool.), series 2, vol. 2, 1 879, p. 27, pi. 5, ligs. 5 — 9; pi. 8, i' tinome tra pectinata). Journ. Linn. Soc. (Zool.), vol. 16, 18S2, p. 517 [Actinometra pectinata and Act. affinis). BELL. "Alert'" Report, 18S4, p. 161 {Antedon irregularis, part); p. [64 [Actinometra solaris. part : p \c tinome tra sp. juv.). 1'. H. Carpenter. 'Challenger" Reports. Comatulae, [888, p. 284, pi. 53, figs. 15 — 22(Acti- none tra pectinata). HARTLAUB. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Xaturforsch., vol. 58, . \ t, p. 107 {Actinometra pectinata). . Proc. Zool. Soc. London, 1894, p. 394 {Actinometra pectinata and . let. panicirra, part). KoEHLER. Mem. soc. zool. France, vol. 8, 1895, p. 422 (Actinometra pectinata). i.i.i EIN. Denkschr. Ges. Jena, vol. 8, 1898, p. 478 (Actinometra pectinata). PFEFFER. Abhandl. der Senck. naturforsch. Ges.., vol. 25, 1900, p. 85 {Actinometra pectinata . A. II. Cl. ark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part :. p. 202. • — — Proc. U. S. National Museum, vol. 3'"), 1909, p. 394. Vidensk. Medd. fra den naturhist. Forening 1 Kobenhavn, 1909, p. 148. - Proc. I'. S. National Museum, vol. 39, 1911, p. 532. Recent Crinoids "f Australia, [911, p. 744. — from th< I- n Mu um, vol. -,}, p. 177. - Die Fauna Südwest-Australiens, vol. 3, 1911, part 13. pp. | 143,444, : th.' [ndian ( >cean, [912, i>. 80. Proc. U. S. X.uion.d Museum, vol. 43, 1912, p. 3S9. nian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 10. II. I.. 1 1 \i:k. [nstitution •■!' Washington Publication N° 212, ioi;. p. 101. A. 1' . Internationale R.e\ nten Hydrobiologie und Hydrographie, 1915, p. ng n'.6 E. 6 1 Metres. 58 Kx. last of 11"! . 4 Ex. - ii; ; ; I . 1 1 54 Mi tres. 1 I Pulu Ka'; Bank. Reef. 1 Ex. Bank, Sulu Archipelago. 15 Metres. 1 I".\. Stat. 99. 6°7'.5N., I20°26'E. 16 — 23 Metres. 12 Ex. Stat. 162. Between Loslos and Broken Island, western coast of Salawatti. 18 Metres. 20 Ex. Stat. 164. i°42'.sS., i30°4/'.5 E. 32 Metres. 1. Ex. Stat. 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 1 3 M. 2 Ex. Stat. 282. 8°25'.2S., I27°i8'.4E. 27—54 Metres. 1 Ex. Stat. 285. 8° 39.I S-, I27°4'.4E. 34 Metres. 6 .Ex. Stat. 294. io° 12.2 S., I24°27'.3E. 73 Metres. 1 Ex. Stat. 299. io°S2'.4S., I23°i'.iE. 34 Metres. 1 Ex. The details of the specimens are as follows : Stat. 49a; twenty-seven of these are fully grown, with the arms up to about 130 mm. in length, while thirty-one represent various immature stages. All are, more or less pronoun- cedly, of the broad armed type. One of the fully grown is purple, the others being yellow brown ; one of the young is orange, the others yellow or yellow brown. This series closely resembles that from Stat. 162. Stat. 50 ; two of the specimens have the anterior arms about 1 10 mm. long; another has the anterior arms 90 mm. long and the postenor 60 mm. long, with four ungrooved ; the last is small. The arms are rather slender, with only a suggestion of an approach to the stout type. Stat. 79; the arms are about 90 mm. long, of the slender type; the cirri are XII, 13 — 14. Stat. 79b; a small individual, the arms being only 27 mm. long. Stat. 96; another small specimen, with arms 25 mm. long. Stat. 99; the largest has arms 75 mm. long and XIII cirri; another has arms 70 mm. long, the posterior arms 55 mm. long, and XI cirri; this example has eleven arms; there are four others similar to the preceding, and six more medium and small, all of the slender armed type. Stat. 162; the largest has the anterior arms 135 mm. and the posterior 85 mm. in length, all very broad and stout; five of the arms are ungrooved; another large specimen has the anterior arms 120 mm. and the posterior 60 mm. long; five of the arms are un- grooved; a third has the anterior arms about 100 mm. and the posterior 60 mm. long, all stout and broad; five of the arms are ungrooved, and 011 the others only the distal pinnules are grooved; a fourth, also of the broad armed type, has the posterior arms 60 mm. long, very stout, stouter than the anterior arms ; five of the arms are ungrooved ; the cirri are X, 10 — 11, 8 mm. to 9 mm. long; a fifth resembles the preceding; the eight medium sized specimens all have broad and stout arms, this character being especially marked in the pos- terior; usually five of the arms are ungrooved; the seven small specimens are similar; the broadening of the arms is marked in individuals with an arm length of only 35 mm. or 40 mm. Stat. 164; the anterior arms are 120 mm., the posterior 70 mm. in length; six of the arms are grooved and four ungrooved ; on the former only the distal pinnules are grooved ; all the arms are rather stout, but not excessively so ; the centrodorsal is greatly reduced, and bears only two cirri, one 7 mm. long with 1 2 segments, the other 6.5 mm. long with 1 1 ; there are also two rudimentary cirri ; the colour is yellow brown, each articulation with two dark spots one on either side of the median line ; the articulations in the basal portion of the pinnules bear single dark spots. Stat. 273; the larger specimen has the anterior arms 120 mm. and the posterior 45 V min to 9 mm. long; the arms are moderately stout, ■ llow brown with ;i narrow mediodorsal line ilet; the smaller specimen has the arms 80 mm. I< XIII. • mm. long and the posterior ~<> mm.; tuur of the iut, especially the posterior; the cirri are si.ua and ■■ ample lias the anterior arms 95 mm. long and the posterior 1 itely stout; six are grooved and four are ungrooved; the cirri \lll. a i individual is similar, but slightly smaller; the last is small, with the arms mm. long; the pst- yy between the elements of the IBr series and that between are perfectly developed. one \ »ung specimen. imen with moderately stout arms 115 mm. long. I liis cimens shows that the pseudosyzy^y between the clements of the [Br firsl two brachials is perfected at a very early age, and furnishes an important racter. Furthermore the brachials of the species of Comatuta always have smooth -. while those ut' the most closely allied genus, Comactiniay have spinose edges. In Coma- purpurea the characteristie arrangement ut" the cirri is evident in very small individuals. Comatulides A. II. ( luk. Ke\ t<> the Species of the Genus Comatulides. 1 ■ irri XXII- XXIV, 12 -15; division series and proximal portion of arms without synarthrial or articular tubercles Lesser Sunda and Kei Islands) . . . australis rri XL. [6 — 17; division series and proximal portion of arms rugged, with strongly developed synarthrial and articular tubercles (southwestern Japan) . decameros 1. Comatulides australis (A. II. Clark . A. II. Clark. Proc. Hink Soc. Washington, vol. 25, 1912, p. 21 Cominia australü .7. 5°54'S., i32°;o.-K. 984 Metres. 1 Ex. 17. to° 39 5., 123° 40 E. 520 Metres. 1 Ex. • imen trom Stat. 207 is slightly larger than the type drom Stat. 2071, having 1 mm. long; the centrodorsal is thin discoidal, very broad, with the circular flat, 4.5 mm. in diameter; the cirri are XXII 1 with a numher undeveloped), 1; illy i( is. 15 mm. to 10 mm. long, arranged in a single irregular marginal row; 20 mm. long; I' is 18 mm. long; tin- clements of the division series and the brachials with a prominent line dermal granulation. il is thin discoidal with the bare dorsal pok ilat. 2.0 mm. in 1 1 1 in three closely crowded roughly alternating marginal 33 The cirri are XXIV, 12 — 13, 13 mm. to 15 mm. long; the first segment is short, the second nearly or quite twice as broad as long, the third twice as long as the diameter of the ends, the foürth-sixth three times as long as the median diameter, the following decreasing in lenoth so that the antepenultimate is about one third again as long as broad ; the opposin;^ spine is represented by a slight subterminal tubercle ; the terminal claw is longer than the penultimate segment, rather stout, moderately curved ; the longer proximal cirrus seiuncnts have slightly swollen distal ends, this character gradually disappearing as the segments become shorter: the eighth or ninth segment becomes lighter in colour distally, and is a slightly marked transition segment, though the preceding segments are smooth like the following; the last four or five segments before the penultimate have their distal clorsal margin very slightly thickened ; the 'cirri are moderately compressed laterally, this increasing slowly and uniformly from the base to the short outer segments. The subradial clefts are very narrow and very deep. The ends of the basal rays are very prominent as rounded tubercles in the angles of the calyx. The radials are concealed in the median line, being visible only at the side of and above the ends of the basal rays; their distal angles are separated interradially by a promi- nent V-shaped gap; the IBi^ are very short, slightly trapezoidal, narrower distally than basally. three times as broad as long; they are very widely separated laterally, the sides of adjacent IBrx making rather more than a right angle with each other; the axillaries are very broadly pentagonal, almost triangular, about twice as broad as long; the lateral edges are about half as long as those of the IBr^ and make slightly more than a right angle with them. The ten arms, which were probably about 90 mm. long, resemble those of C. decameros, but are not so»rugged and show only traces of the synarthrial and articular tubercles. The ossicles of the division series and the lower brachials are covered with fine dermal granulations. Pj is 15 mm. long, composed of 42 segments; the comb occupies 19 segments, arising very gradually; the teeth are low, well separated, and well rounded distally, in height not reaching the lateral diameter of the segments which bear them; the second-fourth or -fifth segments of the pinnule have prominent and coarsely spinous ends. P3 is 12 mm. long, similar to Pj but smaller and proportionately less stout. P3 is 7 mm. long, very slender, proportiona- tely smaller and more slender than P2, Vi is 6.5 mm. long, slightly stouter than P.„ without a comb, slightly stouter than P.,, though becoming very slender distally. The distal pinnules are 12 mm. long with 23 segments which have prominent articulations. This species differs from C. decameros in having fewer cirri which are composed of fewer segments and are very slightly stouter and less compressed laterally. The synarthrial and articular tubercles are not so prominent as in C. decameros, but the rugged character ot the arm bases is indicated, and might become prominent in larger examples. S1BOGA-EXPEDITIE XI.Il/'. Comaster Comantheria Comanthina ter i n ae A . II < lark. of the Subfamily < lomasterina ■ i or 2\ proximal pinnu ng . terminal combs occur al intervals \ 11 .1 ,i m an Islands t o norl he r.n the I' lul i p pine [sla nd s, the Gil- sout hem Ja pan , and China . . and following division series (.(3 ] . no divi- oximal pinnules stouter than the following; termi- to the proximal pinnules 1 III] . UBr | IVBr series in pari or entirelj northern Australia to west Java, the Moluccas, the Philippine Islands, China and southern Japan il] of the IIIBr series 1 (3 + 4) iuter IIIBr series on each ray 2, inner 4(3 + 4); following entirelj or mostly 4 (3 + 4); cirri only exceptionally presenl Maldive I sla mis to northern Australia, Vu Britain, the Philippines, and the Caroline Islands) IIIBr series usually all 4(3+ \)\ if IIIBr series of 2 are present there is no regularity in their occurrence (southern and sou th e ast er n Africa, Ceylon, and eastward to northern Australia. Oceania, and southern Japan) Comanthus d1 cirri few, smal! and weak, slightly if at all compressed distally, irregularly distributed on the centrodorsal, or absent altogether; one or more of the division series usually 2 instead of 4 (3 4 4), but the division series of 2 have no regular arrangemenl (Madagascar and Mauritius to Ceylon, thence to northern Australia. New ('aledonia, the 1'riendly, nga, Fiji, Samoan, Pelew, ('.il bert [Kings- m il 1] and Caroline Islands, southern Japan, and Arno y, China) d9 cirri always present and numerous, well developed, late- rally compressed distally. evenly distributed about the of the centrodorsal; all the division series outhern and southeastern Africa; smania and southern Australia and north- ward to the Ba) >>l Bengal, Samoa, the Mar- shall I sla n 'Is. and southern Japan) Vania i^ubg.) Cenolia (subg.) 35 Comaster L. Agassiz. Key to the Species of the Genus Comaster. a1 Cirri absent b1 IIIBr series on the outer side of each IIBr series 2, those on the inner side benig 4(3 + 4); more than 60 (usually more than 100) arms (northern Australia) belli b2 IIIBr series all 2(1 + 2) 01* 2 c1 80 or more arms over 80 mm. (usually over 100 mm.) long (northern Australia to Fiji, the Gilbert [Kingsmill] I s 1 a n d s , the Philippinesand Singapore) . . . . novaeguineae l) c2 less than 80 arms d' 45 — 80 (usually 50 — 60) arms (Pul o Edam, China Sea, to Singapore) gracilis d2 not more than 45 arms e1 IIIBr series developed only on the outer side of each IIBr series; IVBr series .developed only on the inner side of each IIIBr series; rather stout (northern Australia) multifida 2) e2 IIIBr series developed on both the inner and outer side of each IIBr series; IVBr series rarely present; very slender and delicate (R o 1 1 i , the Philip- pine and Paternoster Islands) minimus a2 Cirri present b1 usually between 100 and 150 arms c1 IIIBr series on the outer side of each IIBr series 2, those on the inner side being 4 (3 + 4); cirri large and stout with 17 — 18 segments, but more or less deficiënt, only very exceptionally being developed all around the periphery of the centrodorsal (northern Australia) bclli c2 IIIBr series all 2 (1 + 2) like the following series; cirri large and well developed, numerous, with 13 — 16 segments, evenly distributed all around the periphery of the centrodorsal (Les- s e r Sunda Islands and Moluccas t o the Philip- pine Islands) multibrachiata b2 not more than 65 arms c1 45 — 63 arms cl1 usually about 60 (37 — 63) arms 90 mm. to 150 mm. long; all the IIIBr series developed; no interradial plating; 1) Synonyms: Phanogenia lypica Loven and Actinometra stcllata Lütken. 2) Synonym : Actinometra variabilis Bell. i gmeni .. well developed k curved touter, not more than one tenth ength; longest cirrus segment not more than thret times as long as the median diameter; multimate segment never longer than broad, 1 penultimate segment broader than long i ui; cirrus segments of which the Ion - l| are half again as long as broad or ai mosl onlj slightly longer; j'1 and following with slightly everted distal dorsal ends 9 and lOlh and following broader than long; arms 150 mm. long (China) schönovi1) \ 8—11 cirrus segments of which the longi l is three times as long as the median breadth; the following decrease in length so that the antepenultimate is about as long as broad and the penultimate slightly broader than long; the 4"' and following have slight dorsal processes; arms 90 111111. long (Lesser Sun da t<> the Philippinelslands) fruticosus*) cirri longer and more slender, more than one tenth of the arm length; longesl cirrus segment from three to three and one half times as long as the median diameter, the following rapidly becoming shorter so that the antepenultimate is slightly longer than broad and the penultimate about as long as broad; the sixth and following have sharp and prominent dorsal processes Java Seal .... sibogae 15 arms; IllHr series developed onrj on the outer side of each IIBr series; IVBr series developed only on the inner side o! [IIBr series; interradial perisome heavily plated; cirri feu, more or less deficiënt (northern Ausi multifida than 45 arms arms 1 8 cirrus segments of the IBr and [IIBr series, and first two ossicles in the [IBr series, united by a II. Clark. Vid. Medd. fra den nalurl I mg i Kohcnhavn, 1909, )>. 141. I : ■ very evident synarthry; IIIBr 2: IVBr 2, but irregular in occurrence; 36 arms about 100 mm. long; cirri XX — XXII, 16 — 18, 13 mm. to IS mm. long; cirrus segments from the iithor i2th onward bearing just proximal to the middle a rounded dorsal tubercle in addition to the sharp subterminal tubercle ; terminal combs occur on most of the genital pinnules as well as on many of the distal pinnules (Tawi Tawi group, Philippinelslands) taviana f- elements of the IBr and IIIBr series united by pseudosyzygy or syzygy as usual; 37 arms 85 mm. long; cirri XXVII, 15 — 17, 12 mm. to 15 mm. long (Kei Islands) pulcher e3 10 — 11 cirrus segments; 40 arms 60 mm. to 70 mm. long; cirri S mm. long (And-a man Islands to the Lesser Sunda Islands, the A r u Islands and the Moluccas) parvus d3 30 — 33 arms e1 24 — 25 cirrus segments; cirri long and stout, only gently curved distally, nearly one third of the arm lensrth ; colour white, with lines and bands of violet (Lesser Sunda to the Philip pin e Islands) . delicata e3 9 — 13 cirrus segments; cirri very short and strongly curved, not more than one seventh of the arm length ; colour yellow or yellow brown f1 longest cirrus segments (4th) about- twice as long as broad ; cirri VIII — XXIII, 9 — 1 3 ; 30 — 33 arms 80 mm. to 100 mm. long (Lesser Sunda and Kei Islands to the M oluccas and the Philippine Islands) distincta f3 longest cirrus segments (3vd and 4th) three times as long as broad; cirri XV, 10 ; 30 arms (southern Japan) serrata 1. Comaster novaeguineae (J. Muller). J. Muller. Archiv für Naturgesch., 1841, I, p. 146 [Alecto novae- guineae). LOVEN. Ofversigt k. Vetensk.-Akad. Förhandl., 1866, N° 9, p. 231, fig. p. 220, a—h [Pha- nogenia typicd). HERKLOTS. Bijdragen tot de Dierkunde, Afl. 13, 1869, p. 11, pi. 10 [Comatula novae-guineaé). Lütken. Cat. Mus. Godeflïoy, vol. 5, 1874, p. 190 {Actinometra stellata; nomen nudum). P. H. CARPENTER. Proc. Roy. Soc, vol. 28, 1879, p. 390 {Actinometra stellata). I . p. 19 imetra I. 1 1 multifida, part . . / tinom !. ypica and 1 I . . i ■ i'h.. vol. ■ 1 1 . V 1 . i/m). 1, p. 134 metra t\ - nek. nat l ometra n Miscellai llections (Quarterlj I 1908, p ;. 191 19, \ " 1 1 1 2, p omaster typ; fra den naturhist. Forening i Kobenhavn, 1909, p. 139 {Comaster typ I eyden Museum, vol. 53, 1 > 1 1 , p. 177 (Comaster typica); p. 178 (67>- \ ustralia, ini 1 , p. 74; 1 ter typi tuna Siidwest-Australiens, vol. $, 1911, part 13, pp. 437, 4: 446,453 • • . • imens 1 omaster typt ■ the Indian Ocean, mij, p naster typica); p. 87 u '. novae-guineoi . Smithsonian Miscellaneous Collections, vol. 60, 1912, N" to, p. 6 [Comaster typica and . Smithsonian Miscellaneous Collections. vol. 6r, 1913, N" 15, p. 1 -' Comaster typx I ma Südwest-Australiens, vol. 4. 191 3, part 6, p. 314 (Comaster typii Internationale Revue der gesamten Hj drobiologie und Hydrographie, 1915, p. 222 omaster typica . Hie followtng citations do not refer to this species : i irdiner, Fauna and Geography of the Maldive and Laccadive Archipelagoes, vol. 1. 1902, part 3. p. 2 j inometra typica) = Comanthina schlegelii. \. II. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue-, vol. 52, 1908, part 2, le-guineae) = Comaster fruticosus. Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 141 [Comaster «1 gin Comaster se hou,', Dii Fauna Südwest-Australiens, vol. 3, 1911, part 13. p. 453 (Comaster typica; the cimens described) = Comaster belli. 1. Pulu Kaniungan ketjil. 1 1 Metres. 1 Ex. j 1. Amboina. 1 Ex. Maui I w WEBER en from Stat. 89 lias the arms 80 mm. long; there are five or six post- • : that from Amboina has the arms 85 mm. long, and five or six post-radial from Maumeri has the arms 75 mm. long and four or five post-radial \ II Clark .; Museum, vol. 36, 1909, p. 392 (Phanogenia-minimc Mei [eti 1 Ex. 39 I am rather doubtful about the correctness of the determination of the specimen from Stat. $7. It has 16 arms about 40 mm. long; there are two IIBr 4(3+4) series, each of them bearing two IIIBr 2 series; the centrodorsal is a ver)- thin pentagonal disk without cirri, though with obsolete cirrus sockets. Though agreeing well with C. minintus, this example does not show the extreme delicacy of build characteristic of that form, and it is possible that it is only a very young specimen of C. novae- guineae. A small specimen with 10 arms 20 mm. long was also secured at Stat. 37; the centro- dorsal is much reduced, and bears five cirri which have 8, 9, 10, 12 and 12 segments. The individual from Stat. 302 has 19 arms about 90 mm. long; three of the IBr series bear a single IIBr 4 (3 -j- 4) series, each of the latter bearing two IIIBr 2 series. The arms are excessively delicate and attenuated, and greatly elongated, and the pinnules are exceedingly slender and hair-like. The distal ends of the brachials and pinnulars, especially the latter, are exceedingly spinous. The distal pinnules are 9 mm. long. The dorsal interradial perisome is heavily plated, and this plating is continued onto the ventral surface of the disk in the form of deep crescents which extend inward in the interambulacral areas ; the plates of the inner portion of these crescents are thickly studded with long sharp spines. The anal tube is com- pletely plated, the plates bearing numerous long spines. The mouth is central, the anal tube subcentral. 3. Comastcr multibrachiata (P. H. Carpenter). P. H. Carpenter. Trans. Linn. Soc. (Zool.), series 2, vol. 2, 1879, p. 23, footnote (Comatula, sp.). Proc. Roy. Soc, vol. 28, 1879, p. 386 [Actinometra novae-guineae). "Challenger" Reports. Comatulae, 1888, p. 299, pi. 56, figs. 3, 4 [Actinometra multi- bracliiatd). Bell. Proc. Zool. Soc. London, 1894, p. 396 (Actinometra regalis, part). A. H. Clark. Smitksonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 204 (Phanogenia multibrachiata). Proc. U. S. National Museum, vol. 36, 1909, p. 392 (Phanogenia multibrachiata). Crinoids of the Indian Ocean, 19 12, p. 86. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 13 (Comaster multibra- chiata, and also C. fruticosus). Stat. 240. Banda. 9 — 36 Metres. 1 Ex. Stat. 316. 7°i9'.4S., n 6° 49.5 E. 538 Metres. 1 Ex. The specimen from Stat. 316 is typical ; there are from 140 to 150 arms; one of the IBr series is 6(5 + 6); the cirri are XVI, 14 — 15. The example from Banda is small and very badly broken. 4. Comaster fruticosus A. H. Clark. A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 204 (Phanogenia novae-guineae). Proc. U. S. National Museum, vol. 39, 191 1, p. 532. Crinoids of the Indian Ocean, 191 2, p, 84. • this sp '•'■ ns, vol. 61, 19131 N° 15, p. 1 ï Comm s) = ind the northeastern point "t rimor. 27 -54 ls about 60 arms vvhich are about 90 mm. long; the cirri are mm i<> 9 mm. long. r is in the ten armed juvenile stage, the arms being 25 mm. long. \. 1 1. Clark. A. II. Clark. Proc. Biol. Soc. Washington, vol. 25, [912, p. 21. .5 S.. 1 14 55 .; E. SS Metres. 1 Ex. I hr cirri are XXII. [3, 13 mm. long; the first segment is short, the.second twice as its median diameter, the third about three dmes as long as its median diameter, the fourth and fifth the longest, trom three to three and one half times as long as the median diameter; tl jegments decrease rapidly in length so that the antepen ultimate is slightly longer than broad and the penultimate about as long as broad; the fifth is a transi- tion segment; the following have small, but sharp and prominent, dorsal spines which are acutely triangular in end view; the opposing spine is subterminal, slender, and very sharp, in [ual to about one third the lateral diameter of the penultimate segment; the terminal claw is nearly or quite twice as long as the penultimate segment, very slender and modera- : basally, but becoming nearly straight in the outer two thirds. The arms are about 60 in number, too mm. long. mouth is subcentral and the anal tube submarginal. The terminal comb on the proximal pinnules lias 11 or 12 teeth. masler sióoga* is most nearly related to C. fruticosus, differing from that species chiefly in its proportionately longer and more slender cirri, which have proportionately longer nd sharper and more prominent dorsal spines in the distal portión. r pulcher A. H. Clark. A. II. Clark. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 22. •r.iit. Kei Islands. Up to 52 Metres. 1 Kx. XXVII, 15 — 17. \z mm. to 15 mm. long; the first segment is about ;econd about twice as long as the expanded distal ends, strongly •rally, the third from three to four times as long as the median diameter, con trally, though n nuch so as the preceding; the fourth segment is slightlj over nal diameter; the following segments rapidly decrease in length 4i that the seventh and following are about as long as broad ; the fourth and following bear small subterminal dorsal tubercles, and also have the distal edge everted and prominent so that in a lateral view they appear to bear dorsally a broad tubercle with a concave crest. The 37 arms are 85 mm. long; one of the IIBr series is 2, the remaining nine being 4 (3 + 4); tne HIt$r series are all 2 ; the three which are absent are all external. The mouth is central, the anal tube submarginal. 7. Comaster parvus A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 144. Crinoids of the Indian Ocean, 191 2, p. 88, fig. 3, p. 88. REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1 9 1 3, Heft 1, p. 87. Stat. 240. Banda. 9 — 36 Metres. 4 Ex. Stat. 274. 5°28'.2S., I34°53'.9E. 57 Metres. 1 Ex. Stat. 294. io° I2'.2 S., I24°27'.3E. 73 Metres 4 Ex. The specimen from Stat. 274 is young; it possesses 27 arms 55 mm. long and cirri XIII, 10 — 11, 8 mm. long. It appears to belong to this species and not to C. distincta for the reason that the IIIBr series are developed externally as well as internally, both occurring on the same IIBr series; in C. distincta external IIIBr series are very exceptional. The largest individual from Stat. 294 has 41 arms 100 mm. long; the cirri are XXIV, 11 — 13 (usually 12) 10 mm. long. Of the others, which are very small, one has 11 arms and two 10 arms only. The largest example from Banda has about 36 arms which are about 75 mm. long; the cirri are 9 mm. long and are composed of 9 — 10 segments. Of the remainder one has 11 arms 25 mm. long, one 10 arms 45 mm. long, and the last 10 arms 35 mm. long. 8. Comaster distincta (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 295, pi. 55, fig. 1 (Actinometra distincta); p. 338 [Actinometra parvicirra, part). Bell. Proc. Zool. Soc. London, 1894, p. 396 (Actinometra parvicirra, part); p. 400 (Antedon brevicirra). A. H. Clark. Proc. U. S. National Museum, vol. 39, 191 1, p. 533 (differential characters). Crinoids of the Indian Ocean, 191 2, p. 87. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 13. Stat. 65a. 7°o'S., i2o°34'.5E. 120 — 400 Metres. 2 Ex. Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 3 Ex. Stat. 153. o°3'.8N., I30°24'.3 E. 141 Metres. 1 Ex. Stat. 260. 5°36'.5S., I32°55'.2E. 90 Metres. 3 Ex. Stat. 289. 9°o'.3S., 126° 24.5 E. 112 Metres. 3 Ex. Stat. 294. io°i2'.2S., I24°27'.3E. 73 Metres. 5 Ex, Stat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 8 Ex. From Stat. Ó5a there are two small broken examples. The largest specimen from Stat. 144 has 21 arms; one ray bears only two, with the SIBOGA-ExrEDITIE f.\A\b. 6 other four irc i i cirrus segments, The other two are io anned young with the arms 33 mm from Stat. 153 has about 34 arms im mm. long. ( >t the three from Stat. 360 one is large, one small, and one verj small with only ten arms. All of those from Stat. 389 are small: one has 16 arms 35 mm. long; there are three IIBr 4(3 1 series each bearing a llll'.r series of 2 internally; another lias 12 arms 35 mm. long; there is a single IIBr 1 (3 + 4) series bearing a [IIBr 2 series internally developed; the third lias io arms 35 mm. long. < 't the live specimens from Stat. 204 the largest has 15 arms 30 mm. long; there are two IIBr 4 (3 + 4), series, one bearing internally a IIIBr 2 series, the other bearing two [IIBr 2 series; another has 12 arms 25 mm. long; there is a single IIBr 4 (3 + 4) s,-''i<-s which bears internally a IIIBr 2 series: a third has 10 arms 25 mm. long, and the remaining two have earh 10 arms 15 mm. long. The largest specimen from Stat. 305 has about 30 arms 75 mm. long; the dorsal pole of the centrodorsal is flat, 2 mm. in diameter; the cirri are XXI, 12 — 13, 10 mm. long; another has 30 arms 70 mm. long; the cirri are 8 mm. long, composed of 9—10 segments; one of the cirri in this example is curiously modified (Fig. 2, A)\ it is composed of 8 segments and measures 5 mm. in length; the first three segments are of the normal type, but the following are strongly flattened iventrally and greatly broadened, the normal distal dorsal spine occurring at each of the distal angles of the segments. The six additional specimens are all small. • 1 1 cimen Stat. ;oj. . i.'.r.illy. with the doubled and placed lateral view. 1 normal cirrus, laterally flattened, i iewed ; .:) latcrally au ' lurtesy of th( nal Mu-cum). Comaster delicata (A. H. Clark. A. II. CLARK. Proc. U. S. National Museum, vol. y>. 1 909, p. 393 {Phanogenia delicata). Stat. 282. 8°25'.2S., i2;:' 1S.4K. 27—54 Metres. 1 Ex. This specimen has 20 arms 65 mm. long and the cirri XIII, 14, 8 mm. long; the tl ft H or sixth (usually the former is a transition segment. I in its smaller size and lesser number of arms this example agrees well with the - from the Philippine Islands in the collection of the U. S. National Museum. Comantheria A. II. Clark. Key to the Species of the Genus Comantheria. ttly reduced; cirri absenl or rudimentary arms IVBr 2; following division series 2, except the outermost, 43 especially on the outer side of each IIIBr series, which are 4 (3 + 4) (Ph ilipp i ne I slan ds) polycnemis e IVBr series 4 (3+4) d1 VBr series 2; VIBr series, when present, 4 (3 + 4) (no rt her n AustraliatothePhilippinelslands) alternans d2 VBr and following series 4 (3 + 4) e1 division series narrow and more or less separated (wester n and northern A u s t r a 1 i a t o the Moluccas and thePhilippinelslands) briaretis l) e2 division series closely united laterally, and the interradial perisome plated (Philip pin e I slan ds) magnifica b2 40 arms (Aru Islands) roiula a2 Centrodorsal large, hearing numerous long cirri b1 cirri slender, in length between one eighth and one fifth of the arm length; the longest proximal segments are from one third to one half again as long as broad ; 40 arms c1 cirri composed of 19 — 20 segments of which the longest are about half again as long as broad (Lesser Sun da Islands) . . . zueberi c2 cirri more slender, with 20 — 28 (usually 24 — 26) segments of which the longest are about one third agahi as long as broad (southern Japan) ..... , inter media \y cirri large and robust, their length equal to about one third of the arm length; the longest proximal cirrus segments are about as long as broad; 31 — 48 arms c1 division series broad, nearly or quite in lateral apposition, the component ossicles with smooth distal edges ; brachials with the distal edges not noticeably produced; 47 — 48 arms (coast of China) grandicalyx c2 division series narrow, strongly convex dorsally, the component ossicles with everted and spinous distal edges; brachials with strongly produced and spinous overlapping distal edges; cirrals with more or less overlapping distal ends; 31 — 48 arms (southern Japan from the Korea n Straits to Sa ga mi Bay) imbricata 1. Comantheria polycnemis (A. H. Clark). A. H. CLARK. Proc. U. S. National Museum, vol. $6, 1909, p. 396 {Comanthus polycnemis). Crinoids of the Indian Ocean, 19 12, p. 89. Stat. 99. 6°7'.5 N., i20°26'E. 16 — 23 Metres. 1 Ex. This individual has 85 arms 130 mm. long. 1) Synonyms: Aclinometra divaricala P. H. Carpenter; Comanthus callipeplum II. L. Clark . |i. > ^4 [Antedon briareus). . pi. 14 (Ante Jon briareus). p. 1 r" Reports. ( omatulae, 1888, i>. 60, N" iO; p. 330 [Actinometra tinometra divaricata). -. Leop.-Carol. deutschen Ak.nl. der Nfaturforsch., vol. 58, 1 1 1 .-. I ondon, (894, p. 394 [Actinometra parvicirra, part). R . lissi zool., vol. 3, 1895, p. 289 [Actinometra divarica I rance, vol. 8, 1895, p. \2\ Actinometra divaricata). A. 11. * 5mithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 190N, part 2, xnthus divaricata) p. 206 [Comanthus alternans). Proc. I' S. National Museum, vol. 36, 1909, p. $95 [Comanthus briareus); p. 596 specimen listed .1- Comanthus alternans in the preceding reference is erroncously referred Zool. Anzeiger, vol. 34, 1909, N" 11/12, p. 365 [Comanthus briareus). Proc. I'. S. National Museum, vol. 39, 191 1, p. 535 {Comanthus [Comanthus] briareus. Die Fauna Südwest-Australiens, vol. 3, 191 1, pp. 437, 439, 443, 444, 454. — Recent Crinoids of Australia, 1911, p. 752. Crinoids "f the Indian Ocean, 191 2, p. 90. Proc. U. S. National Museum, vol. 43, 1912, p. 390. Smithsonian Miscellaneous Collections, vol. 61, 1913, V 15, p. 13. REK HENSPERGER. Abhandl. tier Senck. naturforsch. Ges., vol. 35, 1913, part !, p. 87. 11. L. CLARK. Records of the Western Australian Museum, vol. I, 1914, part. 3, p. 134 manthus alternans); p. 135 [Comanthus pol) ene».. A. 11. CLARK. Internationale Revue der gesamten 1 Iydrobiologie um! Hydrographie, 1915, p. 222. H. L. CLARK. Carnegie Institution of Washington Publication N"2i2, 1915, p. 102 [Comanthus callipeplum). Stat. 33. Bay of Pidjot, Lombok. 22 Metres and less. 1 Ex. Stat. 50. Bay >>{ Badjo, western coast of Flores. lp to 40 Metres. 4 Ex. Stat. 60. Haingsisi, Samau Island, Timor. Reef. 1 Ex. Stat. 96. Southeastern side of the Pearl Bank, Sulu Archipelago. 15 Metres. 1 Ex. Stat. 125. Anchorage off Sawan, Siau Island. 2~ Metres. 1 Ex. Stat. 144. Anchorage north of Salomakiëe (Damari Island. 45 Metres. 1 Hx. Stat. 240. Banda 9 — 36 Metres. 1 Ex. Stat. 257. In Du-roa Strait, Kei Islands. Up to 52 Metres. 1 Ex. Stat. 28: • 2S., \2j' 1S.4 ]•:. 27—54 Metres. 2 Ex. Stat. 299. IO" 52. 4 S.. 123° i'.i E. 34 Metres. 2 Kx. The specimen from Stat. 33 lias about 95 arms which art- about 100 mm. long; the 1 uniform yellow brown. 'II -t indi-vidual from Stat. 50 has about 120 arms about 110 mm. long-; one ol is 2; the IIIBr series on the live rays are as follows: (1) leur of 2; (2) one of e of 4 •,•).; four of 2. 1 four ol 4 (3 | . two of these being on the lllir , and three of 2; the centrodorsal is very small. A. similar example I the UB \ . thirteen <'l* the [IIBr series are 2 and seven are 4 (3 + 4); i of 4 5 1 occur in pairs on the same IIBr series: the centrodorsal 1 and si Another large specimen has one of the IIIBr series 4 (3 + 4), the . and all the IIBr series being 4 (3 + 4); the centrodorsal is very 45 small and stellate, sunk well below the dorsal surface of the radials. The fourth specimen has 37 arms 65 mm. long, and V cirri. From Stat. 60 (reef) there is a medium sized, but robust and well developed, individual with about 100 arms 1 10 mm. long; the centrodorsal is small and pentalobate. The specimen from Stat. 96 has about 80 arms 105 mm. long; the centrodorsal is very small and stellate. The example from Stat. 125 has about 80 arms about 100 mm. long; only seven of the IIIBr series are 2; adolescent autotomy is in progress; the centrodorsal is irregularly polygonal, though sunk below the level of the dorsal surface of the radials ; the colour is dark brown, the radials darker, the centrodorsal nearly white. The specimen from Stat. 144 has between 90 and 100 arms about 90 mm. long; four of the IIIBr series are 4 (3 + 4); the centrodorsal is very small and stellate; the colour is a uniform yellovv brown. The specimen from Banda is typical, with about 100 arms which are about 120 mm. long. The example from Stat. 257 has about 50 arms which are about 90 mm. long. From Stat. 282 there is a typical specimen with about 100 arms, and a small specimen with 26 arms about 70 mm. long undergoing adolescent autotomy; in the latter the arms on the several rays are 2, 1 and 6, 3 and 5, 2, and 6 and i; the cirri are XVI, 12 — 13 (uSually the latter) 8 mm. long. Of the examples from Stat. 299 one is a magnificent representative of the species with about 80 arms 155 mm. long; the IIIBr series are all 2, all the other division series being 4 (3 + 4); tne other is a slightly smaller individual; both have exceedingly reduced stellate centrodorsals. The deepness and strong dorsal convexity of the division series of this species, as well as a certain ruggedness in their appearance, make it easily recognizable in spite of any irregularity which may occur in the IIIBr series. 3. Comantheria rotu/a A. H. Clark. A. H. CLARK. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 23. Smithsonian Miscellaneous Collections, vol. 61, 1 91 3, N° 15, p. 14. Stat. 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 13 Metres. 1 1 Ex. Stat. 282. 8°25'.2S., i27°i8'.4E. 27—34 Metres. 1 Ex. This form is intermediate between C. briareus and C. weberi\ it exhibits the post-radial structure of the latter, but possesses the centrodorsal and cirri of the former. The centrodorsal is greatly reduced, usually with a few weak cirri, though there may be none. The arms are 40 in number, from 100 mm. to 150 mm. long; the IIBr series are 4 (3 + 4), and the IIIBr series are 2 ; there is no further division. The dorsal surface of the animal is smooth, with comparatively little overlap to the brachials, and the rugged appearance charactéristic of C, briareus is entirely absent. \ I 1 * !ark. \ j i Washington, vol. 25, 1912, p. 22. Metres. 1 Ex. lal, moderately thick, the flai dorsal pole 4 mm. in diameter. [XXII, usually the latter] aboul 20 mm. long; the fifth and sixth ,,r si\th ar< the longest, about half again as long as broad; the seventh is a transition segment, strongly marked, with a dark band; the nearlj or quite twice as broad as long; the distal dorsal edge of the the transition segment slowly becomes more and more prominent, forming ridge which on the outer segments becomes subterminal, remaining as .1 nam which may be more or less elevated in the centre; on about the fifth following the transition segment a small low tubercle appears midway between this and the proximal end of the segments which on the onter segments becomes ppinted, so thal in lateral view the dorsal profile of the segments is bidentate, as in Oligometrides aJconac-. the proximal segments are slightly constricted centrally with prominent ends; proximal to the transition segment the cirri are brownish yellow, bevond white and highly polished. There are exactly forty arms 95 mm. long, all grooved; all the IIBr series are 4 (3 -f 4), all the IlIHr series 2: there is no further division. The division series are moderately broad, well rounded dorsally, moderately separated. The dorsal interradial perisome carries small scattered inconspicuous plates. The brachials are moderatelv overlapping. Syzygies occur between the third and fourth brachials, again between the 1 ith and 1 2Ul (more rarely i2lh and 1 yh\ and i6th and 1 7lh (less commonly 1 7lh and 1 s:ii , and distally at intervals of three oblique muscular articulations. The mouth is submarginal and interradial. mant lier ia weberi is very closely related to C. in ter media of southern Japan from which it differs in having somewhat stouter cirri with fewer segments of which the longest are half again as long as broad instead of only slightly longer than broad. Comanthina A. II. Clark. 1 Comanthina schlegelii (P. 11. Carpenter). P. II. CARPENTER. Notes from the Leyden Museum, vol. 3, 1881, p. 210 [Actinometra schlegelii). Journ. I.inn. Soc. (Zool.), vol. 10, 1882, p. 521 [Actinometra sp.j Banda). 1. "Alert" Report. 1884, p. 169 Actinometra multifida, part. P. II. CARPENTER "Challenger" Reports. Stalked Crinoiils, [884, p. i\o [Actinometra dissimilis). . "Challenger" Reports. Myzostoma, 1887, p. 13 {Actinometra nobilis). 1'. II. CARPENTl i . -1 hallenger" Reports. Comatulae, 1S88, p. 335, pi. 64, fig. 3 (Actinometra ituplci . p. 336, pi. 65 [Actinometra nobilis); p. 347. pi. 68 [Actinometra regalis). HAMANN. Jenaische Zeitschr., vol. 23, 1889, g. 234 {Actinometra nobilis). 'Ie biol., vol. II, 1891, p. 315 {Actinometra nobii H.M N . Acta der Leop.-I arol. deutschen Ak.nl. der Naturforsch., vol. 58, 1 tinometra parvicirra, part); p. 99 'Actinometra regalis). 47 Bell. Proc. Zool. Soc. London, 1894, p. 396 {Actinometra duplex). KOEHLER. Revue suisse zool., vol. 3, 1895, p. 293 {Actinometra duplex). Mem. soc. zool. France, vol. 8, 1895, p. 420 {Actinometra regalis). WHEELER. Mittheil. aus d. Stat. Neapel, vol. 12, 1896, p. 224 {Actinometra ?wbi!is). DöDERLEIN. Denkschr. der medicin.-naturwiss. Gesellsch. Jena, vol. 8, 1898, Heft 5, p. 480 {Actinometra regalis). Bell. in Gardiner, Fauna and Geography of the Maldive and Laccadive Archipelagoes, vol. 1, 1902, part 3, p. 225 {Actinometra typica). A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 204 {Comantlius nobilis); p. 205 {Comantlius duplex). Proc. U. S. National Museum, vol. 36, 1909, p. 395 {Comantlms nobilis); p. 397 {Comantlius duplex). Vidensk. Medd. fra den naturf. Forening i Kobenhavn, 1909, p. 143 {Comantlius [Comantlius] nobilis). Proc. U. S. National Museum, vol. 39, 191 1, p. 536 {Comantlius [Comantlius] schlegeliï). Notes from the Leyden Museum, vol. 33, 1911, p. 179. Buil. du mus. d'hist. nat. de Paris, 191 1, Nn 4, p. 248 {Comanthina schlegeliï). Memoirs of the Australian Museum, N° 4, 191 1, p. 753. — — Die Fauna südvvest-Australiens, vol. 3, 191 1, Lief. 13, pp. 439, 443. Records of the Australian Museum, vol. 9, 1912, N° 1. p. 81. Smithsonian Miscellaneous Collections, vol. 60, 191 2, N° 10, p. 8. Proc. U. S. National Museum, vol. 43, 1912. p. 391. Crinoids of the Indian Ocean, 1912, p. 91. Smithsonian Miscellaneous Collections, vol. 61, 191 3, p. 14. REICHENSPERGER. Abhandl. der Senck. naturf. Gesellsch., vol. 35, Heft 1, 191 3, p. 88. H. L. CLARK. Carnegie Institution of Washington Publication N° 212, 191 5, p. 101 {Comantlius schlegeliï). Stat. 33. Bay of Pidjot, Lombok. 22 Metres and less. 2 Ex. Stat. 99. Anchorage off North Ubian. 16 — 23 Metres. 1 Ex. Stat. 164. i°42'.5 S., I30°47'.5 E. 32 Metres. 1 Ex. Stat. 220. Binongka Island. 55 Metres. 2 Ex. Stat. 303. Haingsisi, Samau Island. Down to 36 Metres. 1 Ex. Batavia Bay. 1 Ex. Both of the specimens from Stat. $5 are large and typical of the species. One has the centrodorsal regularly pentagonal, though as yet not quite sunken to the level of the radial pentagon ; the IIBr series on the two posterior rays are 2, on the other three 4 (3 + 4); the IIIBr series on the two posterior rays are 4 (3 + 4) — 2 — 4 (3 + 4) — 4 (3 + 4), and all 4 (3 + 4); on one of the other rays one of the outer divisions is 2, the three others 4 (3 + 4); the other two rays are regular; the division series are very broad, almost or quite in lateral apposition ; when exposed the interradial perisome is heavily plated; the three anterior rays are dark brown with small blotches of yellowish; the two posterior rays and the bases of the arms which they bear are yellowish white, but the outer part of these arms is dark brown like those on the anterior rays, with more or less light yellow in the median line. The other specimen is typical. The example from Stat. 99 is large, with about 120 arms which are about 130 mm. long; the centrodorsal is small, pentagonal, sunk to the level of the radials. The magnificent specimen from Stat. 164 has about 100 arms which are about 150 mm. long; the division series are broad, interiorly united and closely flattened against each other; the adjacent rays and division series are closely flattened against each other as far as the IIBr,, 48 i which |)iiim the perisome is solidl) plated; the centrodorsal inken within the radial circlet; on three of the rays the IIIBr on one ray 2 4 (3 + 4)— 4 (3 + 4)— 4 (3 + 4); and the fifth i 1 Stat. 303 is fully grown, but carries eight more or less rudi- :ri. iiulivitlu.il from Binongka has 70 anus im mm. long; the centrodorsal is idal, with the flat dorsal pole 3.5 mm. in diameter: the cirri are XIV, 14 -15, the colour is whitish, the division series heavily blotched with dark gray; the r part of the arms is dark gra) ; the outer part of the pinnules is brown. The smaller specimen from Binongka has 62 arm 95 mm. long; it closelv resembles iwing; there is usually one more division series on the outer branch of tin- IIIBr series than elsewhere; the arms are less developed and more slender than in the preceding, and the and division series are less broad; the centrodorsal is thin-discoidal, with the dorsal pole ; mm. in diameter; the cirri are XI, with some additional rndimentary, 14 — 15, 10 mm. to 1 2 mm. long. The example from Batavia Bay has about 70 arms 85 mm. long; the rays and division series ,ue comparatively narrow and wel! separated dorsally: the interradial perisome is heavily plated. the cirri are XIV, with others more or less rndimentary, 14 — 16, 10 mm. to 12 mm. long; the colour is slaty gray. Comanthus A. 11. Clark. Key to the Sul genera of the Genus Comanthus. a1 Cirri always present, numerous, evenly distributed about the periphery of the centrodorsal, usually stout, compressed distally, except in two species with more than 20 segments; IIBr series almost invariably 4 (3 + 4) Cenolia . < irri few, small, weak, with the distal segments only slightly shorter than the proximal and only slightly compressed, irregularly distributed about the periphery "i the centrodorsal, or absent altogether ; one or more of the IIBr series 2 instead of 4 (3 -f- 4) Vania Key to the Species of the Genus Comanthus. ent irri entirely without dorsal processes, large, stout, well developed, numerous, mpo ed of 20 — 30 segments (usually 25 — 30) of which the outer are illy only slightly shorter than the proximal; centrodorsal very large, hemispherical, with a deeplv concave dorsal pole; 60 to [20 (usually more arms from 130 mm. to 160 mm. in length (Queensland and the Loyalty Islands to the Andaman Islands and Singapore, nd northward to the Pelew and Marshall Islands) .... bennetti 49 i b3 outer cirrus segments always with more or less developed dorsal processes, and much shorter than the proximal; less than 60 arms c1 cirri very large and stout, long, numerous, composed of more than 32 segments; centrodorsal large, more or less hemispherical, with a relatively small concave dorsal pole; usually about 40 arms, with all the division series 4 (3 -f- 4); size medium or large, the arm length being between 100 mm. and 200 mm. (commonly between 150 mm. and 200 mm.) d1 division series broad, so that only small perisomic areas are visible in dorsal view, and comparatively flat (southernjapan) pinguis d3 division series narrow and strongly convex, exposing broad areas of perisome (sou'thern Japan and southward to Hong Kong) . japonica c3 cirri composed of fewer than 30 (usually fewer than 25) segments, short, or, if elongated, slender; centrodorsal with a broad flat dorsal pole; r3— 35 arms d1 18 — -30 cirrus segments e1 cirri all or mostly more or less undeveloped and very variable in size, composed of a very variable number of segments, though always with fewer than 30 and usually with fewer than 25; division series very broad, comparatively flat dorsally and in close apposition so that no perisome is visible in dorsal view; 20 — 44 arms (sou- thern Japan and southward to Formosa [Taiwan]) . . solastcr e3 cirri all or nearly all mature, the majority of approximately the same size; number of cirrus segments variable only within narrow limits; division series broad and more or less flattened dorsally, but always with more or less perisome visible between them ; 20 — 35 arms t1 cirri shorter and more slender, with about 20 segments; 20 — 35 arms (southern Australia and Tasmania) triclioptera f3 cirri longer and slightly stouter, with 24 — 27 (usually 26 — 27) segments (New Zealand) óen/iai/ü d3 not more than 1 7 cirrus segments e1 cirri, though small, strong and well developed, with the outer portion strongly recurved, distributed evenly about the periphery of the centrodorsal; usually all the division series 4 (34-4); 13 — 21 arms f1 slender and delicate, with 15 — 21 slender slowly tapering arms 50 mm. to 70 mm. long (northern Australia to the Bay of Bengal, the Philip pin e Islands, the Caroline Islands, Tonga, S.amoa, Fiji, and New Caledonia) . samoana f3 stout and robust, with 13 — 21 (usually 16 — 20) short, stout and rapidly tapering arms usually about 60 mm. long (Cape of Good Hope) ' wahlbergii e3 cirri short, weak, and poorly developed, irregularly distributed about S1BOGA-EXPEDITIE XLII 6. 7 50 the periph ' outer portion of the < irri nearly • the HBr series 2 instead of 4 (3 : irms Ceylo n an d t h «• Bay of B e n g a 1 rn a ml northem Australia, the Solomon [si Fiji a n il Tonga, and northward to the Philippin< annulata $0 arms (Seychelles, Madagascar and the Mascarene [slands to Ceylon and the Bay of Bengal, and eastward to western and northern Australia, \eu Caledonia, Samoa, Tonga, the Friendly, Pelew and Caroline I slands, and northward to southern Japan and Arno y, China) parvicirra ent b' usually between 35 and 60 arms, which are more than 100 mm. long (Ceylon and the Bay of Bengal to western and northern Australia, the Solomon I slands, Fiji and Tonga, and nortli- wardtothePhilippines) annulata illy between 20 and 30 arms. which are rarely more than 100 mm. long Seychelles, Madagascar and the Mascarene I s 1 a n d s t o C e y 1 o n and the Bay of bengal, and eastward to western and northern Australia, New Caledonia, Samoa, Tonga, the Friendly, Pelew and Caroline I s 1 a n d s , and northward t o southern Japan and Amoy, China) parvicirra 1. Comanthus (Cenolia) bennet ti 1 J. Muller). LAMARCK. Hist. nat. des animaux sans vertèbres, vol. 2, 1S16, p. 533 (Comatula multiradiata, part |. Dl USS. 1'etrcfacta Germaniae, vol. 1, 1832, p. 202, pi. 61, fig. 2,a — s (Comatula multiradiata). J. Mi 1 1 1 !.. Archiv fur Naturgesch., 1841, I, p. 146 (Alecto bennetti). Abhandl. d. k. preuss. Akad. d. Wiss., 1841 (1843), p. 216 [Alecto bennetti). Abhandl. d. k. preuss. Akad. d. Wiss., 1847 (1849), P- 2^ ' (Comatula [Alecto] multiradiata, part ; p. 204 [Comatula bennet: VRD1N et Hu 1 . Mist. nat. des zoophytes. Échinodermes, p. 20S [Comatula bennetti); p. 210 tinometra multiradiata, part); p. 212 [Comaster multiradiatus). !ii~' 111. Archiv fur Naturgesch., 1866, I, p. 90 (Actinometra bennetti). •WIG. Zeitschr. fur wiss. Zool., vol. 28, 1877, p. 255 {Actinometra bennetti). at. Mus. Godeftrey, vol. 5, 1877, p. 100 [Actinometra brackymet 1'. II. I ITER. Journ. Linn. Soc. (Zool.), vol. 13, 1877, p. 450 [Actinometra bennet. — '1 inn. Soc. / '879, p. -J 'Actinometra bennett the Leyden Museum, vol. 3, 1881, p. 212 (Actinometra bennetti ■ p. 214 metra [•> • - Journ. Linn. Soc. (Zool.), vol. l6, 1882, pp. 521, ~,2},, 52c [Actinometra beun. 'lenger" Reports. Myzostoma, 1887, pp. ;. 7, 11 (Actinometra bennet: 1'. 1 -( hallenger" Reports. Comatulae, 18S8, pp. 59, 61, 329, 331, 348, 366 1 bennetti); pp. 59, {24, ;;i. 7, 386 [Actinometra per, 5i HARTLAUB. Nova Acta der Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, N° 1, p. 95 [Actinometra bennettï). NORMAN. Ann. and Mag. Nat. Hist., (6), vol. 7, 1891, p. 387 [Actinometra peronii). Bell. Proc. Zool. Soc. London, 1894, p. 396 [Actinometra bennettï). KOEHLER. Revue suisse zool., vol. 3, 1895, p. 290 [Actinometra robustipinnd). BELL. Willey's Zoölogical Results , part 2, 1899, p. 134 [Actinometra bennetti and Act. grandicalix). A. H. CLARK. Vidensk. Medd. fra den naturhist. Forening 1 Kobenhavn, 1909, p. 147 [Comantluis [Comanthus] bennetti). Notes from the Leyden Museum, vol. 33, 19.11, p. 180 [Comanthus bennetti). Buil. du mus. d'hist. nat. de Paris, 191 1, N° 4, p. 248 [Comanthus bennetti). Die Fauna Südvvest-Australiens, vol. 3, 1911, Lief. 13, pp. 439, 443 [Comanthus bennetti). Memoirs of the Australian Museum, vol. 4, 191 1, part 15, p. 754 [Comanthus [Bennettia] bennetti). Proc. U. S. National Museum, vol. 43, 19 12, p. 391 [Comanthus bennetti). Crinoids of the Indian Ocean, 1912, p. 93 [Comanthus bennetti). Proc. Biol. Soc. Washington, vol. 25, 191 2, p. 23 [Comanthus crassicirrd). Smithsonian Miscellaneous Collections, vol. 60, 191 2, N° 10, p. 8 [Comanthus bennetti). Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 15 [Comanthus benrfetti). Stat. 133. Anchorage off Lirung, Salibabu Island. Down to 36 Metres. 1 Ex. Stat. 240. Banda. 9 — 36 Metres. 1 Ex. Stat. 299. Buka or Cyrus Bay, southern coast of Rotti Island. Down to 34 Metres. 1 Ex. The small specimen from Stat. 133 I at first considered as representing a new species related to C. japonica. It is evidently very immature, for the irregularity in the numbers of the arms on the different rays indicate that it is undergoing adolescent autotomy. The earlier cirri have slight dorsal processes, and this led me to consider it near C. japonica ; but the later cirri appear to be quite without them. In very young C. japonica the young cirri possess very strong dorsal processes. The centrodorsal is flattened-hemispherical, small, with a fiat dorsal pole 2 mm. in diameter; the cirrus sockets are arranged in one and a partial second irregular marginal rows. The cirri are XVII, 17 — 24, 15 mm. to 24 mm. long, large and stout; the first segment is short, the following increasing in length to the fourth, which is nearly or quite as long as broad, and still further increasing to the fifth and sixth or sixth and seventh which are the longest, nearly or quite half again as long as broad; the following gradually decrease in length so that the last eight or ten are slightly broader than long; on the fully developed cirri (which are evidently not of the type which the animal will possess when adult) the twelfth or thirteenth and following segments have small subterminal dorsal tubercles; the shorter distal segments are slightly compressed laterally and have a polished surface, though this begins gradually without a transition segment; the opposing spine is small, low and broad, median or subterminal. Deep but very narrow subradial clefts are present. The mouth is interradial and submarginal; the anal tube is central. The radials are just visible beyond the edge of the centrodorsal, extending well up in the angles of the calyx; they are slightly separated distally, so that the bases of the IB^ are rather widely separated. The IB^ are short, with a convex proximal border and slightly converging sides; they are about three times as broad as the median length. The IBr3 (axillaries) are broadly 5 a .„., . the anterior angle sharp, the anterior sides concave, the of the IHr, with which they make an obtuse angle. 120 mm. long; ;ill the division series are 4 (3 -t 4); thcre are ,lir,.,. [|B, ree of which are internal, the fourth external at the i division series are narrow so that a large amount <>| perisome .v. this is protected by numerous irregular calcareous plates. n:n. long, stout basally and tapering rapidly in the proximal third, more ut onward, witli 38 segments; the terminal comb is borne on the lasl omposed of low rounded teeth which become o on the three is much shorter than I', and proportionately less stout, though similar; niciits and is io mm. long; the comb consists of nine teeth of which the •n.ill; there are no teeth. on the three or four terminal segments. I' is smal! - mm. long with 23 segments. I', is slightly smaller and more slender than I' , mm. long, with only a rudimentarj comb. 1' is 5.5 mm. long composed of 17 segments, without .1 comb; it is verv slightly stouter than the two preceding pinnules and tapers more nly to the very delicate ti|>. The following ])innules are similar. The distal pinnules are very Ier, 8 mm. long with 17 segments, The colour is gravish brown, the cirri yellowish. The specimen from Stat. 299 is a magniticent typical example of the species with ahout ij.' arms [80 mm. long; the cirri are about XL, 26—28, 35 mm. to 40 mm. long, typically stout and smooth; all of the arms are grooved. The individual from Banda is similar with about 80 arms which are about 180 mm. long; the cirri are XXI, 27 — 32, 35 mm. to 45 mm. long; 011e of the III Br series is 1, and ■ are 2 . all the other division series are 4 (3 -f 4). 2. Comanthus (Ceno/ia) samoana A. II. Clark. 1'. II. CARPENTER. "Challcn^er" Reports. Comatulae, 188S, p. 338 (Actinometra parvicirra, part). .\. II. CLARK. Proc. U. S. National Museum, vol. 37, 1909, p. 30 {Comanthus [Comanthus] samoana). Buil. du mus. ( the 1 1 1 > r series are 2; there are Y1I cirri. That from Stat. 273 has 36 arms 100 mm. long ; there are two small cirri and several stumps. The larger specimen from Stat. 322 has 49 arms 130 mm. long; all of the IIIBr series are present; of the IIBr series six are 2 and four are 4 (3 -f 4). the latter all on two rays; the centrodorsal is greatly reduced, small and sharply stellate; the rays and division series are ad, and are in close lateral apposition and sharply flattened against each other; the smaller has three of the rays undergoing adolescent autotomy; one partially developed cirrus remains on an irregularly pentagonal centrodorsal. The example from Saleyer lias 40 arms So mm. long; one 1\ "Br series is present, and one IIIBr series is lacking; all the division series are 4 (3 + 4); there are V cirri, and several small stumps. 4. Comantkus [Vania) parvicirra (J. Muller). J. M Monatsber. d. k. preuss. Akad. d. Wiss., 1841, p. 1S5 (Alecto parvicirra); p. 186 timoren Archiv fur Naturgesch., 1841, I, p. 14; (Alecto parvicirra and .1. timorensis). Abhandl. d. k. preuss. Akad. d. Wiss., 1841, (1843), p. 216 (Alecto parvicirra and ./. •sis). ihandl. d. k. preuss. Akad. d. Wiss., 1S47 (1849), 1». 260 (Comatula [Alecto] pa> p. 263 [Comatula timorensis). ■ Mi. Ilist. nat. des zoopbytes. Échinodermi 1 >2, p. 206 (Comatula tinto- p. 208 (C. brevicirra). leffroy, vol. 4, 1869, p. 125 (Actinometra trachygaster, part). 55 LüTKEN. Cat. Mus. Godeffroy, vol. 5, 1874, p. 190 [Actinometra trackygaster, part, and Act. intricata, part). GRUBE. Jahresber. der schles. Ges. für vaterl. Cultur, 1875, p. 74 (Comatula mertensï). W. B. CARPENTER. Proc. Roy. Soa, vol. 24, 1876, p. 451 [Actinometra armata). P. H. CARPENTER. Journ. Anat. and Physiol., vol. 10, 1876, p. 574 [Actinometra armata); pp. 574, 582; vol. 11 p. 89, fig. 1, p. 91 [Actinometra [Comatula\ armata). Journ. Linn Soc. (Zool.), vol. 13, 1877, p. 441 [Comatula polymorpha); p. 443 [Actino- metra polymorplia). LUDWIG. Zeitschr. für wiss. Zool., vol. 28, 1877, p. 255 [Actinometra trackygaster). LÜTKEN. Cat. Mus. Godeffroy, vol. 5, 1877, p. 100 [Actinometra trackygaster, part, and Ac- tinometra intricata, part). von Graff. Das Genus Myzostoma, 1877, pp. 12, 13, 19, 22, 72, 79 [Actinometra armata). P. H. CARPENTER. Quart. Journ. Micros. Sci., vol. 18, 1878, p. 355 [Actinometra polymorpha). Trans. Linn. Soc. (Zool.), (2), vol. 2, 1879, p. 1 [Actinometra polymorpha); p. 27 [Actino- metra parvicirra) ; p. 29 [Comatula timorensis). Nature, vol. 19, 1879, p. 450 [Actinometra polymorpha). LUDWIG. Morphol. Studiën an Echinodermen, 1879, p. 1 [Actinometra trachygaster). P. H. Carpentek. Popular Science Review, vol. 4, 1880, N° 15, pi. 6, figs. 1, 2 [Actinometra sp.). — — Buil. Mus. Comp. Zool., vol. 9, 1881, N° 4, p. 161 [Actinometra polymorpha); p. 169 [Actinometra sp.). Notes from the Leyden Museum, vol. 3, 1S81, p. 204 [Actinometra parvicirra); p. 205 [Comatula brevicirra and C. simplex). Quart. Journ. Micros. Sci, vol. 21, 188 1, p. 185 [Actinometra polymorpha). Bell. Proc. Zool. Soc. London, 1882, p. 533 [Antedon mertensï). P. H. CARPENTER. Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 519 [Actinometra parvicirra). Bell. "Alert" Report, 1884, p. 167 [Actinometra cumingii); p. 168 [Actinometra parvicirra). P. H. CARPENTER. "Challenger" Reports. Stalked Crinoids, 1884, p. 50, 52, 57, 67, 102, 103, 107, 120, 121, 124, 133, 283, 337, pi. 61, figs. 2—5 [Actinometra parvicirra). VON GRAFF. "Challenger" Reports. Myzostoma, 1884, pp. 14, 19 [Actinometra intricata, part); pp. 13, 14, 16, 20 [Actinometra parvicirra); pp. 13, 14, 20 [Actinometra mutabilis). P. H. CARPENTER. Trans. Linn. Soc. (Zool.), (2), vol. 2, 1886, p. 475 [Actinometra parvicirra). PERRIER. Nouv. Archives du mus. d'hist. nat. de Paris, (2), vol. 9, 1886, p. 98 [Actinometra armata); p. 116 [Actinometra trachygaster, part); p. 134 (Actinometra polymorpha); p. 153 [Actinometra parvicirra). P. H. CARPENTER. Quart. Journ. Micros. Sci., vol. 27, 1887, p. 389 [Actinometra armata). Ann. and Mag. Nat. Hist., (5), vol. 19, 1S87, p. 39 [Actinometra parvicirra). BELL. Sci. Trans. Roy. Dublin Soc, (2), vol. 3, 1887, p. 645 [Actinometra parvicirra, part, and Act. cumingii; in synonymy, Act. annotea). VON GRAFF. "Challenger" Reports. Myzostoma, 1887, p. 10 [Actinometra parvicirra). BRAUN. Centralbl. für Bakteriol.- und Parasitenkunde, vol. 3, 1888, p. 185 [Actinometra in- tricata, Act. mutabilis and Act. armata). Bell. Proc. Zool. Soc. London, 1888, pp. 384, 387 [Actinometra parvicirra). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 311, pi. 17- figs. 2—4 [Actino- metra elongata); p. 312, pi. 59, fig. 1 (Actinometra simplex); p. 313, pi. 59. fig- 2 [Actinometra rota/aria); p. 331, pi. 62, fig. 1 [Actinometra quadrata); p. 338, pi. 67, figs. 3, 4 [Actinometra parvicirra). HAMANN. Jenaische Zeitschr., vol. 23, 1889, p. 234 [Actinometra parvicirra). HARTLAUB. Nova Acta der Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, N° 1, p. 96 [Actinometra parvicirra; in synonymy Act. intricata, Act. guttata and Act. trachygaster, Lütken, MS.). Bell. Proc. Zool. Soc. London, 1894, pp. 394, 396 [Actinometra variabilis and Act. parvi- cirra); p. 396 [Actinometra rotalaria). THURSTON. Madras Government Museum Bulletin, N" 2, 1894, pp. 106, 114 [Actinometra parvicirra); p. il/ [Actinometra cumiugï). 56 Koehli !'■ 289 (Actinometra parvicirra). in.-naturwiss. (ics. Jena, vol. 8, 1898, Heft 5, p. 479, pi. 36, ■ 1. 2, 1899, i>. 134 (Actinometra parvicirra bhandl. der Senck. naturwi . 1900, p. S3 [Actinometra parvicirra l omp. Zool., vol. 25, i<)Oi. \" 1. p. .S.s (Actinometra parvicut H • Iman, * eylon IV. ui Oystei Report, vol. 2, 1904, p. 15S (Actinometra Mr rchiv fiir Naturgesch., vol. 71, 1905, Heft 1, p. 226 (Actinometra quadrata). A. 11. Clark. 1'roc. I . S. National Museum, vol. 33, 1907, p. 155 (Comatula orientalis). V eiger, vol. 33, 190S, p. 363 (Actinometra parvicirra). A. II. Clark. 1'roc. U. S. National Museum, vol. 34, 190S, p. 440 (Comatula helianthus). Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 205 omanthus rotalaria). Proc. U. S. National Museum, vol. 36, 1909, p. 397 (Comanthus rotalar — Zool. Anzeiger, vol. 34, 1909, N" 11/12, p. 365 {Comanthus rotalaria). Vidensk. Med. fra den naturhist. Eorening i Kobcnliavn, 1909, p. 144 [Comanthus [Co- manthus] rota /ar ia). Huil. du mus. d'hist. nat. de Paris, 191 1, N° 4, p. 249 (Comanthus parvicirra . - Proc. U. S. National Museum, vol. 39, 191 1, p. 536 (Comanthus [Comanthus] parvicirra). ■— Proc. U. S. National Museum, vol. 40, 191 1, p. iS (Comanthus [Validia\ parvicirra). Notes from the Leyden Museum, vol. 33, 1911, p. 181 (Comanthus parvicirra). Memoirs of the Australian Museum, vol. 4, 191 1, part 15, p. 758 (Comanthus [Vania] par; irra). Die Fauna Südwest-Australiens, vol. 3, 191 1, Lief. 13, pp. 439, 443, 444 (Comanthus parvicirra). Smithsonian Miscellaneous Collections, vol. 60, iiji2. N" 10, p. 10 (Comanthus parvicirra). Proc. U. S. National Museum, vol. 43, 191 2, p. 392 (Comanthus parvicirra). Crinoids of the Indian Ocean, 1912, p. 97 (Comanthus parvicirra). Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 18 (Comanthus parvicirra). Proc. Biol. Soc. Washington, vol. 26, 191 3, p. 178 (Comanthus parvicirra). REICHENSPERGER. Abhandl. der Senk. naturforsch. Ges., vol. 35, 1913, Heft 1, p. 88 (Co- manthus parvicirra I. A. II. CLARK. Records of the Western Australian Museum, vol. I, 1914, part 3, p. 121 (Comanthus [Vania] parvicirra). II. L. CLARK. Records of the Western Australian Museum, vol. 1, 1914, part 3, p. 134 (Comanthus parvicirra . Carnegie [nstitution of Washington Publication N" 212, 191 5, p. 102 (Comanthus lutco- fuscum); p. 103 (Comanthus parvicirrum). Stat. 40. Anchorage off Pulu Kawassang, Paternoster Islands. Coral Reef. 2 Ex. Stat. 43. Anchorage <>tï Pulu Sarassa, Postillon Islands. Down to 36 Metres. 1 Ex. Sta! \nchorage off Seba, Savu. Reef. 1 En. Stat. 60. Haingsisi, Samau Island, Timor. Reef. [3 Ex. Lumu I.umu shoal, Borneo Bank. 34 Metres. 15 Ex. . Pulu Kabala-dua, Borneo Bank. 28 Ex. Stat. 81. Pulu Sebangkatan, Borneo Bank. Reef. 1 Ex. Stat. ith side of Pearl Bank, Sulu Archipelago. 1; Metres. 7 Ex. Ie "f Pearl Bank, Sulu Archipelago. Plankton. 1 Ex. nchorage off North Ubian. [6 23 Metres. 21 Ex. \nchorage otï X< >rt h Ubian. 5urface. 1 Ex. 131. Anclvi r o, Karakelang Islands. 13 Metres. 1 Ex. B ". Karakelang Islands. \\c-^ 1 Ex. 57 Stat. 133. Anchorage off Lirung, Salibabu Island. 36 Metres. 2 Ex. Stat. 144. Anchorage north of Salomakiëe (Damar) Island. Reef. 3 Ex. Stat. 162. Between Loslos and Broken Islands, western coast of Salawatti. 18 Metres. 1 Ex. Stat. 172. Gisser; anchorage between Gisser and Ceram Laut. 18 Metres. 1 Ex. Stat. 234. Nalahia Bay, Nusa Laut Island. 46 Metres. 1 Ex. Stat. 240. Banda. Reef. 1 Ex. Stat. 240. Banda. 9 — 36 Metres. 2 Ex. Stat. 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 13 Metres. 1 Ex. Stat. 282. Anchorage between Nusa Besi and the northeastern point of Timor. 27 — 54 Metres. 6 Ex. Stat. 294. io°i2'.2 S., I24°27'.3 E. Off Timor 73 Metres. 3 Ex. Stat. 303. Haingsisi. Reef. 1 Ex. Stat. 310. 8° 30' S., ii9°7'.5 E. 73 Metres. 1 Ex. Stat. 315. Anchorage east of Sailus Besar, Paternoster Islands. Down to 36 Metres. 1 Ex. Maumeri. Coral Reef. 2 Ex. The details of the specimens collected are as follows: Stat. 40: one has 21 arms 70 mm. long: nine of the IIBr series are 2 and one is 4 (3 + 4); there is a single IIIBr series, internally developed; the other, which is similar, also has 21 arms; all of the IIBr series are 2 ; as in the preceding the single IIIBr series is 4 (3 -f- 4). Stat. 43 : a small example with 1 7 arms and V cirri. Stat. 58: a small individual with 14 arms. Stat. 60: All the specimens are of about the same size — medium sized — with the cirri irregular in occurrence, though present in all, slender and weak ; (1) 22 arms 80 mm. long; two IIIBr series on a single IIBr series; one cirrus 6 mm. long with 11 segments; (2) 21 arms; five rudimentary cirri on a semicircumference of the centrodorsal ; (3) 20 arms; X cirri 6 mm. long; (4) 19 arms; one IIIBr series-, V cirri; (5) 19 arms; no IIIBr series; one cirrus ; (6) 17 arms; VI cirri 5 mm. long; (7) 17 arms; IV cirri; (8) 17 arms-, IV cirri; (9) 19 arms; one IIBr series lacking ; IX cirri; (10) 16 arms, one ray with two IIBr series; V cirri; (1 i) 15 arms; IX cirri; (12) 15 arms; VII cirri; (13) 14 arms, two rays with two IIBr series each; IV. cirri. Stat. 78: these specimens are characterized by a slender habitus, few, small and weak cirri, strongly marked "dryness", and a tendency to break at the articulation between the elements of the IBr series. (1) 20 arms 60 mm. long; two IIBr series 2, eight 4 (3 + 4); IV small cirri; (2) 18 arms 65 mm. long; two IIBr series 2, six 4 (3 + 4); I cirrus; (3) 18 arms 45 mm. long; eight IIBr 4 (3 -f 4) series; III cirri; (4) 17 arms 60 mm. long; four IIBr 2 series, three IIBr 4 (3 + 4) series; IV small cirri 4.5 mm. long; (5) 13 arms 55 mm. long; two IIBr 2 series, and one IIBr 4 (3 + 4) series; III small cirri; the remaining ten specimens are similar to these. Stat. 79b: In all of the following the cirri are small and weak, irregular in distribution. (1) arms 70 mm. long; (2) 20 arms and VI cirri; (3) 18 arms, one ray without IIBr series, 65 mm. long; V cirri; (4) 18 arms 60 mm. long; IV cirri; (5) 16 arms 55 mm. long; one small cirrus stump; (6) 16 arms 55 mm. long; VI cirri; (7) 15 arms 60 mm. long; no cirri; (8) 15 arms 60 mm. long; V cirri; (9) 14 arms 55 mm. long; one small cirrus stump; (10) SIROGA-EXPEDITIE XI.II b. 8 tary cirri; n 14 arms 60 mm. long; V drri; 11: 15 mm I ' "m' 50 mm. long; 1 cirrus; 14) 11 arms 11 arms 30 mm. long; lil cirri; (16 10 arms 50 mm long; Vil rri I he remaining specimens are similar. ill, with 16 arms 70 mm. long. mm. long; five of the IIBr series (on three rays) are 2, and two IIBr 2 series each bear two IIIBr series; there are IV 22 arms 65 mm. long; there are three IIBr 2 series, all thé othcr division V small weak cirri 4 mm. long; (3) 20 arms 70 mm. long; all the IIBi all | 1 1 | arms 25 mm. long; 15) 12 arms 30 mm. long; mm. i ■ arms 1 7 mm. long. plankton: Evidently this specimen was taken in the tow-net, along with normally .inisnis. lt is a young example in the ten-armed stage, with arms 17 mm. maller, ten-armed example was captured at the surface at Stat. 99. The only • instance of the capture of a crinoid swimming at the surface was of a young Dorotnefra 1, which was attracted by a submerged electric light. 28 arms 70 mm. long; V cirri; all the division series are 4 (3 + 4); (2) irm; there are ten IIBr series and three [IIBr series; of the latter two are external and is internal; all the, division series are 4 (3 + 4); there are VI cirri; (3) 20 arms; (4) 19 arm- ; arm--; 6 tuur with 12 arms 20 mm. to 35 mm. long; (7) three with 11 arms 20 mm. tn 30 mm. long; one of these is undergoing adolescent autotomy; (8) nine specimens with 10 arms varying trom 13 mm. to 20 mm. in length; the lower pinnules are more or deficiënt. it. 99, surface: One very small 10 armed example. Stat. 131: 211 arms about 90 mm. long; four of the IIBr series are 2 and six are | . there are III cirri. Stat. 131, reef; 21 arms 100 mm. long: ten IIBr series and one HIBr series, all ire present. Stat. : arms; (2) 12 arms 50 mm. long. Stat. 144. reef: (i) 12 arms 70 mm. long; both of the IIBr series are 4 (3 + 4); there are IV small cirri 2 two ten armed specimens, one of the same size as the preceding, the other small. Stat. 162 medium sized with 14 arms. 172 ro arms 1 6 mm. long. I arms 55 mm. long; there are nine IIBr [ (3 -\ | series. iil. with 10 arms; the large perisomic interradials of the young persist just ui the interradial angl irranged on the five rays 1 -f- 2—^4 -f ' — 4 + 4 — 1 + 3 — - i a" the : the cirri are very short, hut slightly mort' robust than usual. ard the type characteristii of C. samoana, V in number. There are in addition five 59 Stat. 294: Three small specimens, one with 12, two with 11 arms. Stat. 310: Small, with 13 arms, undergoing adolescent autotomy; there is a single IIBr 2 series hearing two IIIBr 4 (3 + 4) series. Stat. 315: 15 arms 30 mm. long; three of the IIBr series are 2 and two are 4(3 + 4). Banda, reef: small, with 1 1 arms. Banda, 9 — 36 Metres: (1) 14 arms about 40 mm. long; (2) 12 arms about 40 mm. long\ under£oing adolescent autotomy. Maumeri: (1) 21 arms 80 mm. long; three of the IIBr series are 2, all the other division series being 4 (3 + 4); the single IIIBr series is externally developed; the cirri are XIV, slightly lafger than usual; (2) smaller, with 20 arms; there are nine IIBr series of which four are 2 and five are 4 (34-4); the single IIIBr series, of 2, is internally developed on a ray with two IIBr 2 series. Haingsisi: 17 arms 95 mm. long; two of the IIBr series are 2 and five are 4 (3 + 4!: there are four broken cirri. II. Family Zygometridae A. H. Clark. Zygometra A. H. Clark. Key to the Species of the Genus Zygometra. a1 More than 40 cirrus segments; more than 35 (usually 40 or more) arms (northern Australia and the Aru Islands) b1 more than 40 arms; most of the IIIBr and following division series 4 (3 + 4); proximal pinnules very stout and very long, tapering to a flagellate tip as in Himerometra magnipinna; cirri very long and stout (northern Australia and the Aru Islands) microdiscus*) b2 about 40 arms; most of the IIIBr and following division series 2; proximal pinnules of moderate length, and not especially stout; cirri not especially long nor stout (northern Australia) elegans-) a2 Less than 36 (usually 30 or less) cirrus segments; less than 40 (usually 20 — 30) arms b1 more than 25 (usually about 30) cirrus segments c1 border of the ossicles of the division series and of the first two brachials smooth and not produced (Merg ui Archipelago to Singapore and the Malay Archipelago, northward to the Philippines and Hong Kong) comata c2 borders of the ossicles of the division series and of the first two brachials thickened and everted, finely scalloped or tuberculated (India) andromeda 1) Synonyms (?) Hvponome sarsii Loven; Antedon multiradiata P. II. Carpenter; Zygometra mertoni Keichensperger. 2) Synonym Antedon fliicluaiii P. H. Carpenter. less than i fments mor<- than io arms; cinri rather stunt, must of the cirrus segments broad .is long northern Australia and the Aru Islands) puuctata1) ider, the longer proximal segments aboul one third longer than broad (P hi lip pi ne Islands) pristina : . .- 'ra microdiscus Bell rhandl. Skand, Naturf. Christiania, vol. 10, 1868, p. liv. [Hyponome sarsii). 'Alert" Report, is.s.}, p. 163, pi. 15 Antedon microdiscus). 1'. II. CARPENTER. "ChaLlenger" Reports. The Comatulae, 1888, \>\>. 96, uj . \>\. 9; \>\. 57, 6 {Antedon microdiscus and .1. multiradiata A. II. CLARK. Zool. Anzeiger, vol. 34, 1909, N" 11 12. p. 367 [Zygometra microdiscus). The Recent Crinoids of Australia, 191 1, pp. 760, 761 [Zygometra microdiscus and Z. multiradiata). The Crinoids of the Indian Ocean, [912, pp. 103, 104 [Zygometra microdiscus and Z. multiradiata). REU HENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, Heft 1, p. 90 {Zygometra microdiscus); p. 90, fig. 6, p. 91 [Zygometra mertoni [-— young specimen A. II. Clark. Smithsonian Miscellaneous Collections, vul. 6l, 1913, N" 15, p. 20 (Zygometra microdiscus). 5. Anchorage off Pulujedan, east coast of the Aru Islands (Pearl Banks ; 13 Metres. [4 Ex. This is by far the finest series of this handsome species that has ever been assembled from any one locality. The details of the specimens are as follows: >S arms; colour yellow with small circular spots of red brown on the division series and arm bases; cirri yellow in the proximal half, each segment with a narrow dorsal purple saddle. in the distal half light purple. (2) 60 arms, similar to tin* preceding: all the division series are 4 (3 -f 4); cirri 40 mm. long, composed of 51 — 52 segments; the transition segment is about the twentieth; colour purple, darkest on the cirri, with a broad mediodorsaL line of yellow on each arm. about 80 arms; one division series is 6 13 + 4); yellow brown. bout 75 arms about I IO mm. long; cirri 37 mm. long; yellow brown. arms; yellow brown. about 100 arms; yellow brown. - about 80 arms; yellow brown. 65 arms about 85 mm. long; cirri 35 mm. long, composed of 49 segments; ir light yellow, concentrically banded with narrow bands of purple; cirri deep purple with • yellow blotches. similar to the preceding. trms 145 mm. long; cirri 40 mm. long. composed of 52 — 55 segments; colour vn. II. I . 1 l.itk. 6i (11) 80 arms about 100 mm. long; cirri 35 — 37 mm. long, composed of 48 — 51 segments; Pd 32 mm. long, with about 60 segments; colour nearly white, the cirri and the sides of the rays and arms deep purple. . (12) about 85 arms; colour yellow brown dorsally, purple ventrally. The preceding specimens are all very uniform ; division series of 2 are very rare ; the proximal pinnules are typically very large and stout basally, tapering gradually and becoming flagellate distally; the distal edges of the segments in the outer half are prominent. (13) a young specimen with 17 arms about 40 mm long; two of the rays bear two arms each ; two others bear four arms each, there being one IIBr 4 (3 + 4) series, bearing a IIIBr 2 series internally ; the fifth ray bears one IIBr 4 (3 + 4) series carrying two IIIBr 2 series. (14) a young specimen with 14 arms 25 mm. long; one IIBr series is present, bearing two IIIBr 4 (3 + 4) series; the synarthry between the ossicles of the IBr series is just beginning to transform into a pseudosyzygy. 2. Zygometra comata A. H. Clark. L. VON GRAFF. "Challenger" Reports. The Myzostoma, 1887, p. 2 {Antedon comata P. H. Carpenter, MS., nomen nudum). P. H. Carpenter. "Challenger" Reports. The Comatulae, 1888, p. 265 {Antedon elega?is, part; Semper's Philippine and Anderson's Mergui Archipelago specimens). Journ. Linn. Soc. (Zool.), vol. 21, 1889, p. 305 {Antedon elegans). A. H. Clark. Vid. Medd. fra den naturhist. Forening i Kebenhavn, 1909, p. 151 {Zygometra fluctuans). The Recent Crinoids of Australia, 1911, p. 762, footnote {Zygometra comata). The Crinoids of the Indian Ocean, 191 2, p. 104, fig. 6, p. 105 {Zygometra comata). Proc. Biol. Soc. Washington, vol. 26, 191 3, p. 180 {Zygometra comata). Stat. 162. Between Loslos and Broken Islands, west coast of Salawatti. 18 Metres. 2 Ex. Stat. 179. Kavva Bay, west coast of Ceram. 36 Metres. 1 Ex. Stat. 322. i'/2 miles south of Tandjong Laj ar, south coast of Bawean Island. 32 Metres. 1 Ex. The specimens from Stat. 162 are both young; one, badly broken, is entirely deep purple ; the other, with 14 arms, is deep purple with a broad mediodorsal line of white on the arms. The example from Stat. 179 has 20 arms 90 mm. long; there are six IIBr 4 (34-4) series and four IIIBr 2 series present, the latter all internal; the distal edges of the radials are obscurely beaded ; the sides of the division series and rays bear a few irregular spinous processes; the cirri are XVIII, 28 — 33 (usually 30), 25 mm. long; long dorsal spines are developed from the iith — 1 3,h segment onward. From Stat. 322 there is a small individual with 16 arms 60 mm. long; five of the six IIBr series are 2 instead of 4 (3 + 4); the cirri are XVII, 27, 17 mm. long; the colour is deep purple. 3. Zygometra punctata A. H. Clark. A. H. CLARK. The Recent Crinoids of Australia, 191 1, p. 768 {Heterometra bengalensis). Die Fauna Südwest-Australiens, vol. 3, 191 1, Lief. 13, pp. 440, 443, 444, 446 {Heterometra bengalensis). 6a \ 11 , ; v; K i |K. ( rin the Indian Ocean, 1912, p, [30 (Heterometra bengaJensis \ the tralian 1 Washington, vol. 25, I9I2< 1' -'t [Zygometra punct Vbhandl. der Senck. naturforsch. Ges., vol. JS, 1913, Hefl 1, p. 83 \. 1 Fauna Siidwest-Australiens, vol. .|. 1913, Lief. 6, pp. 313, 3'4 [Zygometra ian Mi ellaneous Collections, vol. 61, 1913, \" k, p. 21 Zygometra punctc H. 1 . ( irnegie Institution of Washington Publication N"2u, 1 ■_*! 5, p. io$ (Heterometra j, \1ul1 • Pulujedan, east coast of the Aru Islands (Pearl Banks). 1 3 Metres. 4 Ex. Tli, men may be described ;is follows: trodorsal is discoidal, thin, with a broad flat circular dorsal pole 2.7 mm. ia diameter. cirri are XV, iS — 19 (usually r8), 9 mm. long; the first segment is very short, the second and third about three times as broad as long, the fourth about twice as broad as the fifth or sixth about as long as broad; the next two or three are similar, the following ..i\ gradually in length so that the distal ten or eleven are slightly broader than long; the sixth and following bear prominent sharp dorsal spines. The radials are entirely concealed by the centrodorsal ; the IBr, are very short and bandlike, six times or more as broad as long, united to the IBr, laxillaries) by pseudosyzx gy : low triangular, with the lateral angles slightly truncated, three times as broad as long. IIT.r series 4 (3+4), broad like the IBr series, with straight lateral edges which are more or -wall-sided" and almost or cpiite in apposition; the lateral outer portions of the ossicles ot the division series are roughened or very finely papillose, as in the species of Marütntetra. The twenty-one arms are 35 mm. long. comparatively short and rather stout; the first brachial is slightly wedge-shaped, three times as broad as the median length, entirely united internally; the second is much more obliquely wedge-shaped, twice as broad as the external length; the first syzygial pair (brachials 3 -f 4) is slightly longer internally than externally, twice as broad as long internally; the following three brachials are oblong, three to four times as broad as long; the succeeding are wedge-shaped, twice as broad as long, becoming as long as broad terminally; the brachials have rather strongly produced distal edges. The disk is entirely covered with a pavement of comparatively heavy calcareous plates which may, especially the larger ones on the anal tube, bear short spines or tubercles. PD resembles P„ and is composed of 20 segments; P, is about 5 mm. long, rather stout illy but in the distal half tapering to a slender tip, composed of 20 segments of which the first is about three times as broad as long and the following gradually increase in length - long as broad on the ninth and slightly longer than broad terminally; the longer jments are rather strongly carinate, the carination having a straight profile which to the long axis of the segments; the short outer segments have slightly prominent 1' is similar. but very slightly smaller and shorter; I' is 2.5 mm. long. composed of 1 and, except for its small si/.-, is similar to the preceding; I', is 2 mm. long with 12 of whi.h the first thre<- ;ire much broader than long, the fourth about as I the distal twice as long as broad; I'. is 2.5 mm. long with 12 segments, 63 resembling P4 but very slightly stouter basally and with longer distal segments; tlie following pinnules resemble P. ; the distal pinnules are 4 mm. long with 15 segments of which the distal are nearly or quite three times as long as broad. The colour is white with numerous regular purple spots on the division series and arm bases and in band-like areas on the distal part of the arms; the cirri are white, with a band of purple on each segment. In this specimen there are eight IIBr 4 (3 + 4) series and one IIBr 2 series; a HIBr 2 series is developed internally on one of the IIBr 4 (3 + 4) series. A similar specimen has seventeen arms, with five IIBr 4 (3 + 4) series and two IIBr 2 series; the cirri are XVII, 18, 9 mm. long. The remaining two specimens are small. This curious little species has caused considerable trouble. lts general appearance is such that it is very easily confused with Heteromctra bengalcnsis with which, moreover, it agrees in colour, differing entirely from any species of Zygometridae heretofore known. All of the records of Hetei'ometra bengalensis from Australia (from Port Curtis and the Holothuria Bank) refer to this form. Very recently Dr. Hubert Lyman Clark has redescribed this species (Publication N° 212 of the Carnegie Institution of Washington, 191 5, p. 105) under the name of Heterometra delicata, basing his description upon a specimen which he found on the sand flat on the southern side of Friday Island, Torres Straits. Catoptometra A. H. Clark. Key to the Species of the Genus Catoptometra. a1 40 — So arms; all the division series 2 (Philippine Island s) magnifica a2 less than 30 arms; IIBr series 4 (3 + 4) b1 11 — 13 arms; cirri short and stout, few or none of the component segments being longer than broad; in life banded broadly with brilliant red and brilliant yellow alternately (Hong Kong to southern Japan). . . mbroflava b~ 20 or more arms; cirri longer and less stout, the longest segments being twice as long as the median diameter; in life usually uniform in colour, yellow, brown or green, rarely red and yellow c1 20 arms; 15 — 16 cirrus segments; ossicles of the division series and first two brachials with prominently everted and produced spinous distal borders; dorsal pole of the centrodorsal papillose or finely spinous (southern Japan) fiart/auói1) c- 20 — 27 arms; 15 — 19 (usually 17 — 18) cirrus segments; ossicles of the division series and arm bases smooth ; dorsal pole of the centro- dorsal smooth; colour usually green, rarely red and yellow (Malay Archipelago and Philippine Island s) ophiiira 1) Synonym Zygometra hoihteri A. H. Clark. i , ( \ I I ( l.irk. .\. II I ■ \, k. Pi l'. S. National Museum, vol. 39, 191 1, p. 539. M 1 . Meti .1 Ex. AH • iens are badly broken. One of those hom Stat. 49" has the centrodorsal ,1 flat, lal, with the dorsal pole 6.5 mm. in diameter marked with faint radiating in the centre; the cirri are XXX. 17—19, 23 mm. or 24 mm. long; the cirri, and in fact the whole animal, are less robust than those of the type series. other specimen is slightly smaller, bul exactly similar; the dorsal pole ol the centro dor mm. in diameter; the cirri are XXVII, 17. 20 mm. long. arm Kas--,, centrodorsal and cirri are light flesh colour, the latter becoming pinkish distally; the arms beyond the second syzygy are bright yellow-orange, regularly banded with ai red as in C. rubroflava and in C. magnifica. The specimen from Stat. 294 has 13 arms; the three IIBr series are 4 (3 + 4); tne of the centrodorsal is 3 mm. in diameter; the cirri are- XX. 16, 20 mm. to 2 2 mm. 1'liis example resembles the preceding, hut the centrodorsal is only half as broad ; con- sequently the cirri appear shorter and more of the division series is visible. Eudiocrinus P. H. Carpenter. Key to the Species of the Genus Eudiocrinus. a1 Cirri very long, composed of much elongated segments of which the longest are four times as long as the median diameter or longer, and the distal are twice as long as broad; enlarged proximal pinnules stout basally, very long, tapering ijradually to a delicate, almost flagellate. tip, and composed of 15 segments (Moluccas) junceus 1 ('irri short, the Ion gments never more than twice as long as broad, the distal segments about as long as broad none of the cirrus segments are longer than broad c1 P„ though elongated and stiffened, is slender like the succeeding pinnules, and is composed of 17 segments, of which the third and fourth are half again as long as broad, and the outer three or four times as long as broad (Lesser Sunda Islandsi pinnatus cs P, is enlarged as well as stiffened, and is composed of 11 or 12 of which the first four are broader than long and the outer ar«- about twice as long as broad (southern Japan) variegatus cirrus segments are about twice as long as the median diameter, 0 11 .1 • long as broad firsi segmenl of I'. bears a very large spatulate or fan-shaped high as it- lateral diameter, and the following segments 65 bear high carinate processes which rapidly diminish in height distally ; Pj is similar to Pd, but the height of the dorsal processes on the segments is much reduced; the ossicles of the IBr series and the earlier brachials have the edges swollen and everted, and more or less scalloped or beaded (Ti mor and the Philippine Islands) venustulus c2 slight and uniform, if any, processes on the proximal segments of the proximal pinnules d1 the ossicles of the IBr series and the earlier brachials have everted and more or less produced edges, so that the dorsal profile of the base of the arm is strongly serrate e1 lower pinnules very sharply triangular; oh Px and Pa the distal edges of the segments are very strongly produced at the prismatic angles, so that the pinnules have a strongly serrate dorsal profile (Philippine to the Lesser Sunda Islands) serripinna e3 Px and Pa rounded triangular, the distal edges of the segments everted and spinous all around the dorsal side, this being slightly, if at all, accentuated at the prismatic angles (Andaman Islands to Ti mor) ornatus1) d3 the edges of the ossicles of the IBr series and the earlier brachials are only slightly, if at all, everted, so that the dorsal profile of the base of the arms is smooth e1 third segment of Px and Pa half again as long as broad (B u r m a) gracilis e2 third segment of P1 and Pa not longer than broad (P h i- lippine Islands and the Ma cel es field Bank to the Moluccas, the Kei and Lesser Sunda Islands) indivisus*) i. Eudiocrinus junceus A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 25. Stat. 167. 2°35'.5S., i3i°26'.2E. 95 Metres. 16 Ex. The centrodorsal is discoidal, moderately thick, the sides sloping inward rather* strongly ; the dorsal pole is from 1 mm. to 1.5 mm. in diameter, and flat; the cirrus sockets are arranged in two closely crowded irregular rows. The cirri are XXV, 22 — 23 (usually 22), 23 mm. long; the apical cirri are 12 mm. long with 1 7 segments. The cirri are greatly elongated with greatly elongated segments, slender, tapering gradually from the base to the tip, though rather more in the first three or four segments than subsequently. As a whole the cirri strongly suggest an approach to the type 1) Synonym Eudiocrinus minor A. H. Clark. 2) Synonym Eudiocrinus granulaties Bell. S1BOGA-EXPEDITIE Xl.II />. • " - characteristi ich spe» variaus or /'. japonicus. The hrst cirrus lent is very short, th< ot so long as broad, the third nearly or quite t \\ i< < as long as th<- proximal diameter, the fourth and following aboüt fout times as long .ts the median diameter; the sixth-eighth iegments are the longest, the length from that point onward diminishing almost imperceptil eventeenth and following are slightly over twice as long as id and i as long as broad, tapering somewhat distally; theopposing spim mail rounded subterminal tubercle; the terminal claw is slighdy longer than the penultimal tent, very slender, very sharp, and only slightly curved. The second and third cirrus segments are rather stronglj constricted centrally; the sixth and following have moderatel) expanded and slightly overlapping distal ends, this character gradually dying away distally. The cirri are rather strongly com pressed laterally from the fifth segment onward. The radials are just visible beyond the edge of the centrodorsal ; their distal border is swollen and everted, smooth or evenly tuberculated. The IBr series (th<- lust two ossicles following the radials) forms an oblong unit which is not quite twice as l>road as long: both the proximal and distal borders are turned ontward, the former slightly. bul the latter standing up at right angles to the general sin face of the segment, ^l^Eudioa-inus/unceus with a smooth and somewhat thickened edge ; the proximal l size. (Courtesy of the U.S. border mav bc more or less scalloped, and it bears just n). within it a prominent rounded tubercle; the produced distal is thickest and most prominent in the middorsal half, this portion being evenly concave; the remainder of the distal edge may be irregularly scalloped. The five arms are 90 mm. long; the first brachial is oblong, two and one half to three as broad as long: the proximal and distal edges are slightly thickened and everted: the second brachial is similar, but the distal edge is prominently everted, especially in the middle third where it is thickened, and concave distally, and stands up vertically from the dorsal surface of the joint face; the third and fourth brachials (forming the first syzygial pair) are ther slightly longer on one side than on the other, about twice as broad as the lesser length, résembling the IBr series but with the tubercle within the median part of the proximal •nly just indicated; the following three brachials are slightly wedge-shaped, about twice ; as the median length, their distal borders everted as described lor the second brachial, I pn ely less and less so; following brachials triangular, about as long as broad, with jhtly pi I and overlapping distal . the fourth-ninth bear a low rounded median rination, this after the ninth becoming the low rounded zigzag keel characteristic of the arms of the genus, which is traceable throughout the length of the arm. Sy/ygies brachials 3-1-4, 84-9 and 1 5 + 14 (usually to 15 -f 16, and distally at intervals I (usually 3) oblique muscular articulations. 67 Pc is 6.5 mm. long and composed of 15 segments, rather stout basally, but tapering to a very delicate tip; the fïrst segment is short, the following increasing in length and becoming about as long as broad on the fourth or fifth, and twice as long as broad terminally; the second-sixth bear a narrow sharp straight edged carination vvhich is equally high on each ; the prismatic edge is sharp; the outer surface of the pinnulars (between the prismatic angles) is flat or very slightly concave. Pj is similar, 6.5 mm. long with 1 3 or 14 segments. Pa is 11 mm. long, much larger and stouter than those preceding, but evenly tapering and becoming very delicate distally, composed of 15 segments, at lïrst short, becoming about as long as broad on the fourth and three times as long as broad distally; the second-fourth bear a low even cari- nation; the second and following have the distal edges all around produced and finely spinous; following pinnule (on the opposite side of the arm) 11 mm. long with 15 segments, exactly resembling Pa; Pb 8 mm. to 10 mm. long with 19 segments, very slender; the proximal segments are as small as the first segments of P, ; the first segment is short, more or less crescentic; the second is about twice as broad as the median length ; thé third is not so long as the distal breadth ; the fourth is from one third to one half again as long as broad ; the following gradually increase in length, after the eighth becoming from three to four times as long as broad; the fifth and following have shghtly produced and spinous distal edges ; P3 is 10 mm. or 11 mm. long with 18 or 19 segments, similar to Pb; Pc is 8 mm. long with 17 segments, very slender, more slender than Pb, with more elongated segments; Pt is similar to Pc; Pa is 7 mm. long with 18 segments, resembling Pc, but even more delicate and with more elongate segments; P. is similar to Pd; Pe is 6.5 mm. long with 16 segments, resembling P the one described; the third, with the same arm length and numbei production of the dist. il edges of the lower brachials and of the proximal pinn iore pronounced. I 3 from Stat. 294 vary in arm length fróm 27 mm. to 65 mm., most 1 55 mm. and 65 mm. Even in the smallest the carination of the carlier as strong as in the adults, though more rounded and not truncate .'.ly: bnt only the median swollen portion of the eversion of the borders of the ped. In these specimens the carination of the first pinnule segment is often mwch higher than the transverse diameter of the segment, fan-shaped, and with a dentate crest. A specimen from "Albatross" Stat. 5355, Philippine Islands, 44 fathoms (Cat. X" 36009 U. S. Nat. Mus.), appears to belong to this species. Eudiocrinus ornatus A. H. Clark. A. II. CLARK. The Crinoids of the Indian Ocean, 191 2, p. 99, and p. 102 (/:. minor), fig. 4, p. 100, anil fig. 5, p. 103 (juv.). St.it. 294. io° 12.2 S., I24°27'.3K. J2 Metrcs. 2 Ex. < )ne of the specimens may be described as follows : Centrodorsal discoidal, the cirrus sockets arranged in two rows; the bare dorsal pole is 2.5 mm. in diameter. The cirri are XXI, iS. 12 mm. long, comparatively slender; the segments increase in length to the fourth-sixth, which are about twice as long as the proximal diameter; the distal ;ht are about as long as broad; the longer segments are centrally constricted with ly Haring 'distal ends. The distal edge of the radials and the proximal border of the IBr, are slightly thickened and turned outward; there is a slight tubercle in the centre of the latter; the distal edge of IBr series is everted, the middle fourth thickened into a transversely elongate tubercle; the central half of the distal border of the proximal discoidal brachials is everted and spinous ; the ■ f the following brachials is slightly produced and finely spinous; the lateral borders of the IBr series are finely dentate. Pi is 5 mm. long, composed of 12 segments; P, is 7.5 mm. long with 15 segments; 12 mm. long with 16 — iS segments, at first short, becoming about as long as broad on fourth, twice as long as broad on the eighth or ninth, and slightly longer terminally ; the pinnule > only m ly stout; the segments overlap slightly along the prismatic crest, where there is ■ lopment of spines on their distal ends; in profile the prismatic crest is slightly notched". pecimen is similar; it has arms 50 mm. long. It is quiti ihat this form should be regarded not as a distinct species, but as marked variety of /:'. indtvtsus, bearing the same relation to the latter that Cotylo- 'otylotnetra gracilicirra omata. 71 5. Eudiócrimts serripinna A. H. Clark. A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, part 2, p. 211. Stat. 49a. 8° 23'. 5., ii9°4'.6E. 69 Metres. 1 Ex. Stat. 310. 8°3o'S., ii9°7'.5E. 73 Metres. 1 Ex-. This specimen from Stat. 310 has the cirri XIX, 14 — 15 (usually the latter), 10 mm. long; the first segment is short, the following graclually increasing in length so that the fourth and following are about as long as the median diameter; in the longest cirri the fifth-eighth may be one third longer than broad basally; the fourth-seventh or -eighth are centrally constricted with expanded distal ends, this expansion being especially marked dorsally so that the dorsal profile of the cirrus is rather strongly serrate, but this dies away distally so that after the tenth segment the dorsal profile becomes smooth and straight; the fifth is a more or less marked transition segment. The five arms are 55 mm. long. P2 is composed of 12 — 13 segments, as in the type specimen. This example differs from the type of the species only in its slightly greater size. The individual from Stat. 49a has the ornamentation of the brachials slightly more accentuated than in the preceding. It is possible that this, like the preceding, is merely a very strongly marked variety of E. indivisus. 6. Eudiocrinus indivisus (Semper). Semper. Archiv für Naturgesch. 1868, I, p. 68 [Oplüocrinus indivisus). P. H. Carpenter. Journ. Linn. Soc. (ZoöL). vol. 16, 1882, p. 495. Bell. Proc. Zool. Soc. London, 1894, p. 397, pi. XXIII [Eudiocrinus granulatus, sp. nov.). A. H. Clark. Crinoids of the Indian Ocean, 1912, p. 102. Stat. 65a. Kambaragi Bay, Tanah Djampeah, 400 — 120 Metres. 2 Ex. Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 2 Ex. Stat. 257. In Du-Roa Strait, Kei Islands. Up to 52 Metres. 2 Ex. Stat. 260. 50 36'.5 S., 132°55'.2E. 90 Metres. 2 Ex. Stat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 3 Ex. The two specimens from Stat. 65a are small, with arms from 25 mm. to 30 mm. long. The four examples from Stats. 144 and 257 are also small; in these the brachials, except the basal, show a strong production of the distal edge. The individuals from Stat. 260 have the arms 35 mm. and 40 mm. long. Of the specimens from Stat. 305 one has the arms 80 mm. long, the cirri XYIII, 17, 11 mm. long, and the second pair of pinnules 6 mm. long with 11 — 12 segments; another has the arms 95 mm. long, the cirri XVII, 16, 17, 13 mm. long, and the second pair of pinnules 7 mm. long with 12 — 13 segments; the third specimen is similar to the first. These agree minutely with specimens from the Philippine Islands, taken by the "Albatross" at Stat. 5356 (Cat. N° 35139 U. S. Nat. Mus.). Himerometra III Family Himerometridai A. II. Hark. Key to the Genera of the Family Himerometridae. .1 1' : ;i.-r than 1',, which in turn is longer and stouter than p§. division strongly rounded dorsally, widely separated; HlHr series on the outer side of each 1 1 1 "• r series 4 (3 + 4), on the inner side usually 2; large .m>l robust species witli from 20 to 65 (rarely less than 30) arms which are usually between 100 mm. and [50 mm. long Persian 1'. uit' to the Kei Islands, the Admiralty Islands, Mat hias I si and. the Philippines and C och in China) . .1 1'p shorter and mort- slender than I',. which in turn is shorter and more slender than 1' (in ten armed types P, is shorter and more slender than 1' . and the latter is shorter and more slender than I' b1 mort- than 10 arms c1 cirri very slightly curved (nearly straight), gradually tapering to a sharp point distally, the distal segments proportionately as long as, or longer than, the proximal, twice as long as broad or even longer, and entirely without dorsal processes; no opposing spine; terminal claw long and nearly straight d1 cirri very long and stout, the proximal portion light in colour. each segment with a ventral purple saddle, the distal portion dark brown, composed of 42 — 46 segments; division series usually broad, well rounded dorsally, not in lateral contact ; large and robust species with from 20 to 36 arms usually between 100 mm. and 130 mm. in length B u r m a t o H o n g K o n g , and southward t o the Andaman Islands and Sydney, Xew South Wales) Craspedometra da cirri small, very slender, entirely white in colour, composed of 25 — 30 segments-, 10 or 1 1 arms from 70 mm. to 90 mm. in length (Arafura Sea; Moluccas) Homalometra c- cirri not especially long and not noticeably stout; the distal portion is more or less strongly recurved; the distal cirrus segments are always much shorter than the proximal, and usually bear iimre or less prominent dorsal spines, more rarely being simply carinate dorsally; the opposing spine is always well developed and prominent; the terminal claw is of moderate length or short, tngly rurved (east Africa from Madagascar and Bagamoyo to Suez, east war d to the Moluccas and lorthern Australia, and northward to southern Japan) Heterometra 10 arms only c1 cirri large, never slender, usually stout, tapering only very slightly, if at all, distally ; distal cirrus segments shorter than the proximal, broader than long, hearing prominent tubercles or spines dor- sally; opposing spine long and well developed; terminal claw stout, strongly curved (Maldive Islands and Ceylon to northern Australia, and northward to southern Japan) Amphimetra c3 cirri small, very slender, nearly straight, tapering to a sharp point ; distal cirrus segments proportionately as long as, or longer than, the proximal, more than twice as long as broad, with no dorsal processes ; no opposing spine ; terminal claw long, very slender, and nearly straight (Arafura Sea; Moluccas) . . Homalometra Himerometra A. H. Clark. Key to the Species of the Genus Himerometra. a1 Enlarged proximal pinnules slender, flagellate distally, and very long (slightly more than one half the length of the cirri), composed of from 36 to 40 perfectly smooth segments most or all of which are longer than broad ; a few of the earlier segments are narrowly, but prominently, carinate; the earlier segments of the following pinnules are very strongly carinate; the segments in the outer half of the cirri have prominent dorsal spines b1 20 to 25 arms; about 35 cirrus segments; all of the segments in the proximal pinnules are longer than broad (P e r s i a n G u 1 f ) . . persica b" 35 to 61 arms; about 40 cirrus segments; a few of the basal segments in the proximal pinnules are broader than long (Philippin e Islands) bartschi a'2 Enlarged proximal pinnules very stout, with all or nearly all of the com- ponent segments broader than long, or at least as broad as long; none of the segments are carinate ; following pinnules without carinate processes on the earlier segments b1 enlarged proximal pinnules with about 30 segments, very stout basally and distally gradually tapering to a delicate and flagellate tip ; the distal edges of the segments in the middle half or proximal two-thirds are swollen and may be strongly everted, but are always smooth, never spinous c1 cirri very stout, stouter than in any other species of the genus ; the enlarged proximal pinnules have the segments in the basal two-thirds with strongly produced and everted distal edges (Maldive Islands) sol ê cirri rather short and weak, without, or with only slight traces of, dorsal processes on the outer segments ; the enlarged proximal SIBOGA-EXPEDITIE XLIli. IO pinnuli mt-nts in the middle half with slightly swollen dis: i i n ( ' li i n ;i . Philippine and Admiralty Islands, and Si. Mathias 1 si and) magnipinna tal pinnules with 20 or fewer segments, distally tapering m abruptly, and without a flagellate tip nts oi the enlarged proximal pinnules entirely smooth; the ■ ■ 1 component segments may ]><• slightly swollen, \ maj be unmodified, hut they are never spinous; distal "i tin- proximal brachials smooth, or only very slightly product . 1 eylon, Arrakan coast, Burma, Amboina, the Sunda, Kei and Philippine Islands, and Mac- clesfield Bank) robustipinnar) segments of the enlarged proximal pinnules with prominently erted and spinous distal ends ; distal ed-'-s of the proximal brachials strongly produced and everted (Singapore and north Borneo) martensi 1. Himtrometra magnipinna \. 11. Clark. Hak 1 1 Aii;. X.ichr. Ges. Göttingen, Mai [890, p. 185 {Antedon crassipinna, part; specimen from Cochin China . Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Xaturforsch., vol. 58, 1891, N" 1, p. 32 (but not figs. i, 5, 10 on pi. 1) {Antedon crassipinna, part, the specimen from Cochin l hina; the specimens from Amboina, upon w Iiich the descriptions and figures are based, represent H. robustipinna [P. II. Carpenter]). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, p. 356 [Himerometra crassipinna, part). Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, p. 214 [Hitnero- metra magnipinna; "Albatross" Stat. 5139, Philippine Islands, between Joló and Pangasinan Island, in 20 fathoms (type locality); and Stat. 5147, off Balinpongpong Island, south of Joh', in 2i fathoms). — Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 [Himerontetra magnipinna, and H. crassipinna, part . - Proc. I'. S. National Museum, vol. 39, 191 1, p. 540 {Himerontetra magnipinna; Ulugan . Palaw; Smithsonian Miscellaneous Collections, vol. 60, 1912, X" 10, p. 17 [Himerometra magni- pinna; redescription and identification of Hartlaub's specimen from Cochin China. - Proc. U. S. National Museum, vol. 43, 1912, p. 394 {Himerometra magnipinna). ' rinoids of the Indian Ocean, iou, p. 114 [Himerometra magnipinna); p. 116 (//. crassi- pinna; record from Cochin China). Anchorage off the south point of Kabaëna Island. Keef. 1 Ex. mail and immature specimen with twelve arms 45 mm. long. Two HBr 4 (3 -f 4) oped on one ray; the cirri are XV, 18—21, 17 mm. long. On the arms arising tly from the 11 ir series P, is much larger than 1',, the proportions being as on the free Reicl '. li.in.11. der SeDck. naturfol 1913 Ut' 1 . ; . 8 3 : //. .•; -assipinna, p. 98. 75 undivided arms of the aclult. The longer proximal cirrus segments are half again as long as broad, and are constricted' centrally, so that the cirri, which are rather slender, have very much the appearance of the cirri of Stephanometra monacantha or of Dichrometra protectns. The dorsal pole of the centrodorsal is slightly convex. 2. Himerometra bartschi A. H. Clark. A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, p, 212 [Himerometra bartschi); p. 214 [H. persico). Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 164 [Heterometra martensi). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 [Himerometra bartschi, and H. persica, part). Crinoids of the Indian Ocean, 1912, p. 114 [Himerometra bartschi); p. 116 [H. persica; records from the Phiüppines). Stat. 96. Southeastern side of Pearl Bank, Sulu Archipelago. 15 fathoms. 1 Ex. This specimen has 61 arms 120 mm. long-, four of the rays bear 12 arms each, the fifth 13; each IIBr series bears externally a IIIBr 4 (3 + 4) series, internally a IIIBr 2 series which bears two IVBr 4 (3 + 4) series. The cirri are rather stout, 30 mm. long with i~] — 38 segments; the longest proximal segments are from half again to twice as broad as long; there is very little difference between the proximal and distal segments; from the nineteenth or twentieth segment onvvard prominent dorsal tubercles or short blunt dorsal spines are developed. Pd is 23 mm. long with 37 segments, very stout basally but tapering evenly to a slender and flagellate tip, the basal segments are twice as broad as long, the following gradually increasing in length and becoming about as long as broad on the tvvelfth, and half again as long as broad in the delicate terminal portion ; the pinnule is perfectly smooth, with no tracé of eversion of the distal edges of the segments. Pp is 22 mm. long with 36 segments, only very slightly smaller than Pd- Pj is similar to the two preceding but somewhat smaller, 1 7 mm. long. P„ is weak and slender, 8.5 mm. long with 23 segments of which the second-fifth have a prominent narrow carination the distal border of which is parallel to the longitudinal axis of the segments. P3 is 6.5 mm. in length, resembling P3 but very slightly smaller. Pt is 5.5 mm. long, resembling P3 but very slightly smaller-, the second-fourth segments are carinate. From this point the amount of carination of the earlier segments of the pinnules decreases, though it is traceable to the end of the proximal fourth of the arm. This specimen differs from the type specimen only in the slightly smaller size and in the slightly shorter proximal cirrus segments. Heterometra A. H. Clark. Key to the Species of the Genus Heterometra. a1 Enlarged proximal pinnules without prominent keels on their earlier segments b1 enlarged proximal pinnules smooth, slender, the component segments without lateral processes or produced and spinous distal edges hl median keel, but n. [56 .1 raspcdometra ah, Pi Museum, vol. 59, 1911, p. 540 Amphimetra variipinna). il, J, imII. Lief. 13, pp. 440, .\.\\, .\\\,.\\<> Aniphhiu-tra ■• .1 iseum, vol. .>. 1911, part [5, p.; phimetra variipinna). ctions, vol. 60, [912, N° 10, p. 16 {Amphimetra crenula !'i. 1912, p. 110 [Amphimetra variipinna); p. 120 [Craspe- I 6, p. 314 [Amphimetra variipinna auct. . luit not Antedon variipinna P. II. Carpenter, 1 Smithsonian Miscellane lections, vol. 61, 1913, N ' ! 15, p. 22 [Amphimetra crenulata). ER. Abhandl. der Smck. naturforsch. (les., vol. 35, 1913, Heft 1, p. 92 : . p. 99 [Craspedometra anceps 1'. II. I arpenter [C. «www n. sp.f]). 5. Anchorage off Pulu Jedan, eastern coast "f the Aru Islands (Pearl Banks). 13 Metres. 7 Ex. • -. 1 . ; i .9 E. 57 fathotns. 2 Ex. rhe specimens from Stat. 273 exactly resemble others from northwestern Australia; the arms are stout, basally strongly llattened laterally, and very rugose; the development of the on the pinnule segments is very strong. One very fine typical example has : arms 1:0 mm. long; all the IIBr series are 4 (3 +4); both the III Br series are 2, internal; mr is white, the outer part of the pinnules and cirri violet. Another has 20 arms 1 10 mm. of the IIBr series are absent; all the IIBr series are 4 (3 + 4); the two HIBr series, both internally developed, are 2 ;• the colour is similar to that of the preceding, with in addition a few narrow purple bands and blotches on the outer part. of the arms. A third has t6 anus mm. long; there are five IIBr 4(3-1-4) series, and one IIIBr series of 2. internally developed. A fourth has 16 arms 115 mm. long; there are six IIBr 4 (3 -f- 4) series. The three remaining ipl< s are similar. The two from Stat. 274 are small; the Iarger has [3 arms 75 mm. long; there are IIBr 4 (3 4-4) series on three separate rays; the colour is flesh-coloured, with regular narrow purple bands on the arms. 2. Heterometra propinqua A. II. Clark). A. II. Clark. Ann. and Mag. Nat. Hist. (8), vol. 10, 1912, p. 32 [Amphimetra propinqu Stat. 318. 6°36'.5S.-, 114 55'-S E. 88 Metres. 6 Ex. 2 Ex. The cirri are VIII XIII, 24 - 36 (usually 30 — 33), 26 mm. to 32 mm. (usually about they are very slender, and taper gradually in the proximal third, being especially 1 that point onward. In general they recall the cirri of Leptometra celtica. All the approximately subequal in length, about twice as Ion-' as broad at the <-nds, dist.d third of the cirrus are slightly carinate, which makes them appear and those in the proximal half are slightly longer, with slightly expanded ends ; ilight indication of dorsal tubercli Si The arms vary from 10 to 13 (usually 11 — 13) in number, and are from 90 mm. to m. long. PT is 7.5 mm. long with 18 segments which, gradually increasing in length, become about as long as broad on the fourth or fifth and Uvice as long as broad terminally ; the second-eighth have a strong, though rounded, supplementary ridge (this not being indicated in H. producta). P„ is 10.5 mm. long with 17 segments, slightly stouter basally than P,, but tapering less gradually and composed of longer segments; the supplementary ridge occurs on the second-ninth. P., is similar to P„, 9 mm. long. F± is 6 mm. long with 1 1 segments, a supple- mentary ridge on the second-fourth or -fifth. P3 and P:, are not stouter basally than the succeedihg pinnules, but they taper with slightly less rapidity ; the distal angles of their component segments are only slightly swollen and produced — about as in H. producta. The distal pinnules are 10 mm. long, composed of 20 segments. The colour is brownish white, with occasional narrow bands of rusty on the arms; the cirri are white. This species is most closely related to H. producta, but is even more slender and delicate. The elongate distal cirrtis segments serve to distinguish it at once. The characters of the six specimens from Stat. 318 are included in the above description. One of those from Stat. 320 has 11 arms 120 mm. long, with one IIBr 4(3 +4) series; the cirri are 30 mm. long with 33 segments. The other is smaller with 12 arms about 55 mm. long, both the IIBr series being 2, and the cirri 20 mm. long. 3. Heterometra quinduplicava (P. H. Carpenter). P. H. Carpenter. Quart. Journ. Geol. Soc., Feb. 1880, pp. 41 (footnote), 42, 43 {Antedon, sp., from Stat. 212). uChallenger" Reports. Comatulae, 1888, p. 229, pi. 39, fig. 5 {Antedon clemens); p. 254, pi. 35, fïgs. 1 — 3 {Antedon anceps); p. 262, pi. 4, figs. ia — d; pi. 47, figs. 4, 5 {Antedon quinduplicava). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 214 {Himerometra quinduplicava). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 {Amphimetra anceps); p. 11 {Hetero- metra quinduplicava). Vidensk. Medd. fra den naturhist. Forerring i K^benhavn, 1909, p. 162 {Heterometra q u in dup licava). Crinoids of the Indian Ocean, 19 12, p. 120 (Craspedometra anceps, except reference to C. aiiena, which latter is H. creuulata); p. 130 {Heterometra quinduplicava). Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 23 (Amphimetra anceps); p. 27 {Heterometra quinduplicava)-. Stat. 99. Anchorage off North Ubian. 16 — 23 Aletres. 1 Ex. The 26 arms are 80 mm. long; two of the arms arise directly from IBr axillaries; there are eight IIBr series of 4 (3 -f 4) each of which bears internally a IIIBr series of 2. The cirri are XVIII, 27 — 30, 22 mm. long. This resembles exactly a specimen dredged by the "Albatross" at Stat. 5139, near Joló (Sulu), in 20 fathoms (Cat. N° 35183 U. S. National Museum). SIBOGA-EXPEDITIE XLII b. I I 4- //. ■ trol. Deutschen Akad. der Natu; vol. 58, il. pi. nol 21 .«- given in the reference to 1 North ri)i.mi. 16—23 Metres. 1 Ex , arms about -> > mm. long; each IBr series bears on the right hand - a IlBr 4 3 + 4) series; the two additional arms on the lcft mi onl) :: mm. in length, measuring from the axillary. The longest cirrus Th mul; individual just completing the adolescent autotomy. Amphimetra A. II. Clark. Key i" the Species of the Genus Amphimetra. very stout, > omposed of very short subequal segments which are usually iut four times as broad as long-, the outer segments, which are relatively ry slightly longer than the proximal, bear small sharp median spines b' larger and stouter; cirri very large and stout, usually evenly curved throughout the entire length, never tapering distally, composed of 45 — 51 segments of which the distal half or two thirds bear dorsal spines; arms from [50 mm. to 170 mm. long (Philippinelslands) spectabilis -maller and more delicate: cirri very stout basally, but usually tapering more or less distally, usually curved much more stronylv in the distal than in the proximal halt", composed of 34 — 37 segments of which nearly all bear dorsal spines ; arms from 100 mm. to 115 mm. long (Maldives to the Sunda Islands, the Moluccas, the Philippines and Singapore) molleri 1 "irri more slender, more or less straight in the proximal half but strongly curved distally, composed of segments which are longer in the proximal portion than distally; the proximal segments are from twice as broad as long to as - or slightly longer than, broad basal ts of the pinnules in the proximal foUrth of the arm are ngly carinate; 1'. is the largest and longest pinnule, slightly larger and than 1' , and twice as long as the distal pinnules; cirri XII, 30 — 33; mm. long Philippine Islands; ? North Borneo) . . pari/is ments of the earlier pinnules are not carinate; the longest imal pinnule is usually P, more rarely I'. which is very little, if any, than the distal pinnules nol tapering distall}-; all of the cirrus segments are markedly than lo §3 d1 28 — 50 (usually about 40) cirrus segments; arms 115 mm. to 300 mm. long; the dorsal spines on the outer cirrus segments appear in lateral view as broad triangles with the apex produced and subterminal instead of small sharp median spines as in spe c tab il is and mol Ier i (Sunda Islands and Moluccas southward to bet ween Fremantle and Geraldton, Western Australia) . . . jacquinoti d3 25 cirrus segments, of which the outer bear long and sharp dorsal spines; arms about 60 mm. long; P, with 12 thick segments, larger and much stouter than Px or P8, which are subequal, though the latter is stouter basally (Northwestern Australia and New Guinea) ■ pinniformis c2 cirri more slender, tapering more or less distally, the longer proximal segments about as long as broad, sometimes slightly longer than broad, more rarely slightly broader than long d1 usually 40 — 50 (32 — 51) cirrus segments which bear small dorsal spines from about the i8th onward ; arms usually about 130 mm. long; synarthrial tubercles usually promjnent, though not excessively deve- loped, and pointed (northern and eastern Australia to Singapore, Formosa, and the Philippine Islands) . . discoidea d3 not over 35 cirrus segments; arms not over 120 mm., usually not over 100 mm., in length e1 synarthrial tubercles very high, extravagantly developed; 30 cirrus segments; arms 80 mm. long (Singapore) ensifer e2 synarthrial tubercles slightly, or not at all developed 'f1 dorsal spines on the outer cirrus segments small or medium in length (Canton, China, tosouthern Japan) . . . laevipinna f2 dorsal spines on the outer cirrus segments long and conspicuous (New Guinea to Tonga and Fiji) papuensis 1. Amphimetra spectabilis A. H. Clark. A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 190S, part 2, p. 215 (Himerometra milder ti). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 [Amphimetra milberti, part). Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 156 (the species referred to under the name of Amphimetra milberti in the discussion of A. mollen). Proc. U. S. National Museum, vol. 39, 1911, p. 540 (Amphimetra milberti). Crinoids of the Indian Ocean, 1912, p. 111 (Amphimetra milberti, part). Localities. — Only known from the Philippine Islands; "Albatross" Stat. 5100, South Channel, Manila Bay, 35 fathoms (Cat. N° 35245, U. S. National Museum); and Limbones Cove ("Albatross" Coll.; Cat. N° 35196 U. S. National Museum). 84 \. 1 1 • ui. i. 1887, part 61, p. 1 {Antedon >iul/><> • noti 1. //:,'< don milberti). 1'. 1 1. i imatulai p. 194, pi. \—6 {Antedon n er" cimen and tho rded from Padan Bay, Mergui A: ... I.mn. vol. 21, 1889, p pi. 27, h " milbei II v LCta der ksl. I trol. deutschen Akad. iler Naturforsch., vol. \ ,1891, . 222 [Himerometra mollet Proc. Biol. Soc. Washington, vol. 22. [909, p. 7 Amphimetra mollen. — — Vidensk. Medd. fra den naturhist. Forening 1 Kpbenhavn, 1909, p. [56 {Amphimetra mollen). Notes from the Leyden Museum, vol. 33, 1911, p. [81 Amphimetra mollerï). Crinoids of the Indian Ocean, 1912, p. 11 1 Amphimetra milberti part ; p. 112 {Amphi- metra mol/, Smithsonian Miscellaneous Collections, vol. 61, 1913, X" 15, p. 24 {Amphimetra milberti, hallenger" specimens, luit not the specimen from Port Mulle, which represents A. jacquinoti; and Amphimetra mollet Localities. Maldive Islands, Suvadiva, 43 fathom-, (Bell; A. II. Clark); Ceylon, Guit" of Manaar, outside Dutch Moderagam Paar, ii1/., — 36 fathoms, orbitolites sand. nullipores and dead coral; 5 miles west and southwest ol Negombo, 12 — 20 fathoms, coarse yellow sand with a few dead shells, 77.5 Fahrenheit (Chadwick); "Indian Ocean" iA. H. Clark); King Island (native name Padaw Island), Mergui Archipelago, "half of them from mud-flats exposed at spring tid( s Graff, ! I' II Carpenti Singapore (A. H. < ; Straits of Mali A. II « . Java Sea A. II. C] Atjeh. Sumatra (Hartlaub; A. II. Clark); Sunda Islam East Indies A. II. Clark); Philippine Islands, " Challenger" Station 203, ofi Panay 11 06 X.. 12; 09'E.), 20 fathoms. mud, and "Challenger" Station 212, off Zamboanga ; \., 122 i o fathoms, sand P. H. Carpenter; A. H. Clark •. ? Brazil(A. H. Clark). 3. Amphimetra par Hit A. II. Clark. r. «Ier schlesisch. Ges. für vaterl. Cultur, [875^.74 Coma tula laevissima,] Bi LL. Proc. Zool. Soc. Londo ' Ante, Ion laevissima, part). •I'. II. ( ARPENTER. Pi . Soc. London, 1882 1883), p. 740 Antedon laevissima. pari • A. II. CLARK. Proc. Biol. Soc. Washington, vol. 22. p. 7 Amphimetra laevissima, part). I'roc. I'. 5. National Museum, vol. \j, [909, p. 52 Amphimetra panlr , Is of the Indian Ocean, 1912, p. 112 (? Amphimetra laevissima part; A. pan/is). Philippine Islands, "Albatross" Station 5147. off Balinpongpong Island (south of Jol,',.. 21 fathoms -A. II. Clark North Borneo Grube). 35 Remarks. — Judging from what Carpenter says in the "Challenger" Report it appears possible that my Amphimetra parilis is the same as one of the two specimens upon vvhich Grube based his Comatula laevissima. As yet I have had 110 opportunity of examining these. 4. Ampliimctra jacquinoti (J. Muller). J. MULLER, Monatsber. d. k. preuss. Akad. d. Wiss., 1S46, p. 178 (Comatula jacquinoti). Abhandl. d. k. preuss. Akad. d. W'ss., 1847 (1849), p. 255 [Comatula jacquinoti). DUJARDIN et HUPÉ. Hist. nat. des zoophytes. Échinodermes, 1862, p. 202 {Comatula jacquinoti). P. H. CARPENTER. Trans. Linn. Soc. (Zool.), (2), vol. 2, 1879, p. 29 {Antedon jacquinoti). BELL. Proc. Zool. Soc. London, 1882, pp- 533, 534 {Antedon jacquinoti). P. H. Carpenter. Proc. Zool. Soc. London, 1882 (1883), p. 746 (Antedon jacquinoti). Bell. "Alert" Report, 1884, p. 156 (Antedon milberti, part; one specimen from Port Molle). P. H. Carpenter. "Challenger" Reports. Comatulae, 188S, p. 194 {Antedon milberti, part; Ceram and Port Molle, ex J. MULLER and Bell). Koehler. Revue suisse zool., vol. 3, 1895, fase. 2, p. 289 {Antedon milberti). A. H. Clark. Smithsonian Miscellaneous Collections (Ouarterly Issue), vol. 50, 1907, part 3, p. 356 (Himerometra milberti, part). HAMANN. Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, 1907, Abt. 3, p. 1580 {Antedon milberti, part.). A. H. CLARK. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (Amphimetra milberti, part). Buil. du mus. d'hist. nat., Paris, 191 1, Nn 4, p. 250 (Amphimetra milberti). Die Fauna Südwest-Australiens, vol. 3, 191 1, Lief. 1 3, pp. 440, 443 (Amphimetra milberti); p. 444 (Amphimetra discoidea) ; p. 459 (Amphimetra discoidea, specimen here originally recorded, and records from Western Australia). ■ Memoirs of the Australian Museum, vol. 4, 191 1, N° 15, p. j6y (Amphimetra milberti); p. 459 (Amphimetra discoidea, west Australian specimen). Proc. U. S. National Museum, vol. 43, 191 2, p. 393 {Amphimetra discoidea). Crinoids of the Indian Ocean, 1912, p. 1 1 1 (Amphimetra milberti, part); p. 112 (Amphi- metra discoidea, part). Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 24 (Amphimetra milberti; specimen from Port Molle). REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, Heft 1, p. 95 (Amphi- metra milberti). A. H. CLARK. Records of the Western Australian Museum, vol. 1, 1914, N° 3, p. 123 (Amphi- metra discoidea). Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1915, p. 223 (Amphimetra milberti). Stat. 33. Bay of Pidjot, Lombok. 22 Metres and less. 4 Ex. Stat. 164. i°42'.5 S., i30°47.5E. 32 Metres. 2 Ex. The largest specimen from Stat. 33 has the arms 135 mm. long; the centrodorsal is thick discoidal, with the dorsal pole broad and convex, 7 mm. in diameter; the cirri are XXIY, 44 — 47 (usually 46 — 47), 45 mm. to 50 mm. long; the cirri are rather stout basally, but taper very appreciably distally; rather prominent dorsal spines are developecl from the thirteenth or fourteenth segment onward; the synarthrial tubercles are small, but sharp and prominent; the disk is almost completely covered with a pavement of rather small plates; the cirrus segments are subequal, the longest (in the proximal portion) being slightly broader than long; the ends of the cirrus segments in the earlier part of the cirri are slightly swollen and prominent. Another arms 130 mm. long and cirri XIII, 38—40, 35 mm. t<> [O mm. long; the dorsal spines nteenth; the longest cirrus segments are i ün as 1 .is long A third nas arms 115 mm. long and cirri XIV, 34 41, about 30 mm. long; the on the tenth to the thirteenth segments; on several "f the cirri the two t" lirst three or four have a longitudinally elongate chisel-like apex, or itudinall; d; the longest cirrus segments are half again as broad as long; tin- colour oming purplish toward the end <>f the «irri and arms. The fourth has the arms mg and the cirri XVII, 41 — 43, 35 mm. to 40 mm. long; the longesl cirrus segments . n as broad as long ; spines ar.- developed From the twelfth onward; the colour is purple. In the two specimens from Stat. \<<\ the arms and cirri are slightly stouter than in the nul the cirri are proportionately shorter with a less marked production ol the distal the iegments; in one the arms are about 1 po mm. long, and the cirri are XVII, 34, 2; mm. long; the longest cirrus segments are from halt' again to twice as broad as long; spines ai iloped trom the tenth or eleventh onward. and the earlier spines are doublé as . • ■; the colour is violet, the cirri yellow becoming violet distally in one example. These two :ly resemble specimens at hand from Western Australia. The cirri are proportionately shorter than in those from Lombok, and the dorsal and veiural profile of the individual segments is much less concave so that they appear much smoother, as in the Western Australian variety. Remarks. — The chief feature of this species is the long stout cirri which taper only very slightly if at all distally, and are composed óf short approximately equal segments which are never so long as broad; as I remember it the type, from Ceram, and those just described from Lombok have the cirri much less curved than the others which I have examined; but the were killed by immersion in fresh water, which may account for their condition ; those from Lombok have the longest proximal cirrus segments with the most produced distal ends. My notes on the type, which I examined during a recent visit to Paris, are as follows : "Les cirres sont gros et larges, distalement comprimés; du 1 :'■' ou 1 ;e article on trouve nes dorsales qui sont assex proéminentes ; Ie premier article est tres court; les suivants augmentent progressivement jusqu'aux 8C ou 9e, qui atteignent en longueur une moitié de la is les articles des cirres sont a peu pres égaux en grandeur. 11 y a dix bras, qui sont robustes; les plaques radiales sont cachées; 1'article IBr, est tres court. a peu pres entière- ment uni a. voisins; 1'article IBr axillaire est presque triangulaire, et atteint une lai 1 fois la longueur, ils ne se touchent pas tout a fait latéralement ; les tubercules synarthriaux que légèrement développés; les articles brachiaux sont extrêmement caurts, un imbr pinnules sont comme dans 1' ' Amphimetra i)iil/>cr(i décrite par CARPENTER ic'est VAmphimelra violleri). La couleur est d'un noir brunatre". Li — Ceram J. M ller; 1'. H. Carpenter; A. II. Clark); Amboina (Koehli : northeast of Misool 1 p .; S., i;,o 47'. 5 E.), 32 Metres (see above ; Bay of 1 k, 12 Metres and 1< e above); Port Molle, Queensland Bed ; A. II. Ci \rk); \ H.C between Fremantle and Geraldton, Western Australia, 60 — joo 1 87 5. Amphimetra discoidea (A. H. Clark). Grube. Jahresber. der schlesisch. Ges. für vaterl. Cultur, [875, p. 74 [Comatula laevissima, part). Bell. Proc. Zool. Soc. London, 18S2, p. 533 [Antedon laevissima, part). P. H. Carpenter. Proc. Zool. Soc. Londen, 1SS2 (1883), p. 746 (Antedon laevissijna, part). Bell. "Alert" Report, 18S4, p. 156 (Antedon milberti, part). Proc. Linn. Soc. New South Wales, vol. 9, 1884 (1885), p 497 (Antedon milberti). P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 194 (Antedon milberti, part; Australian records). BELL. Proc. Zool. Soc. London, 1894, p. 394 (Antedon milberti). A. H. CLARK. Smithsonian Miscellaneous Collections (Ouarterly Issue), vol. 50, 1907, part 3, p. 356 (Himer ometra milberti, part). HAMANN. Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, 1907, Abt. 3, p. 1580 (Antedon milberti, part). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 214 (Himerometra anceps, specimens without definite locality; the others represent Hetero- metra quinduplicava)\ p. 215 (Himerometra diseoidea). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (Amphimetra laevissima, part, and Amphimetra milberti, part). Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, pp. 156, 157 (Amphi- metra formosa). Die Fauna Südwest-Australiens, vol. 3, 191 1, Lief. 13, p. 459 (Amphimetra discoidea, except specimens here originally recorded, which represent A. jacquinoti, and the specimens from New Guinea, which represent A. papiiensis). Buil. du mus. d'hist. nat., Paris, 191 1 N" 4, p. 250 (Amphimetra discoidea). - Memoirs of the Australian Museum, vol. 4, 191 1, part 15, p. j66 (Amphimetra discoidea). Crinoids of the Indian Ocean, 1912, p. 11 1 (Amphimetra milberti, part); p. 112 (Amphi- metra laevissima, part, and Amphimetra discoidea). Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 24 (Amphimetra discoidea). REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, Heft 1, p. 93 {Amphimetra discoidea). A. H. CLARK. Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1915, pp. 223, 224 (Amphimetra discoidea). Stat. 99. Anchorage off North Ubian. 16 — 23 Metres. 1 Ex. Stat. 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 13 Metres. 16 Ex. The specimen from Stat. 99 is typical, and resembles others at hand from Australia: it is yellovv brown, the cirri and pinnules purple. A typical example from Stat. 273 has the arms 115 mm. long, and the cirri XV, 32 — 34, 22 mm. long; the longest cirrus segments are slightly broader than long; the disk is almost completely covered with plates. There are twelve similar specimens, and two small and immature. A four-rayed individual similar to that described was secured; the missing ray appears to be the anterior. These specimens exactly resemble others at hand from Oueensland and from north- western Australia. The cirri are comparatively slender, tapering distally. Remarks. — Dujardin and Hupé mention that in the Paris Museum they fouhd a comatulid bearing the name Comatula dibrachiata. I examined what I suppose is the same specimen, a dried individual brought from Australia by MM. Péron and Lesueur. In my notes 88 I wr.tr *Cet exemplaire a ét» déterminé par Carpenter comme 'Comatula {Antedon) milberti raéhiata \ il ressemble complètement a 1'original de l'United States National Museum de YAtnphi Les cirres ont 26 ou 27 articles. Je crois que eet échantillon a servi .. G • kin-Mi \i \ 11 u pour 1'original de sa figure de Comatula carinata dans son Icono- animal". Localities. — Takao, Formosa Taiwan \. 11. Clark); Philippine Islands, between and Pangasinan Island, tg fathoms ("Albatross" Stat. 5138), and without more definite locality (A. II. Ci vrk . North Borneo (Grubi |; Singapore (A. 11. Ci \rk); Aru Islands R11. 111 \ Aru islands, anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks), 13 Metres see above); North Ubian, anchorage, 16 23 Metres (see above); Australia (A. II. Clark); Western Australia (A. II. Clark); Holothuria Bank, northwestern Australia, 15 fathoms A. II. Clark); northwestern Australia. S — 15 fathoms (Bell; A. II. Cl \kk ; Prince of Wales Channel Bei . same locality, 7—9 fathoms (P. H. Carpenter); same tv and depth, sandy bottom (A. H. Clark); Torres Straits (Bell); same locality. 10 fathoms P. H. Carpeni ime locality and depth, sandy bottom (A. H. Clark); Port Denison, Queensland Bell; A. II. Clark); same locality. 3 — 4 fathoms (P. H. Carpenter); Port Molle, ensland B . A. II. Ci vrk); Port Molle, 12—20 fathoms (P. II. Carpenter; A. H. Clark). 6. Amphimetra ensifer (A. H. Clark). A. H. CLARK. Proc. Biol. Soc. Washington, vol. 21, 1908, p. 225 Himerometra ensifei Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 {Amphimetra ensiformis). Viden.sk. Medd. fra den naturhist. Forening i Kobcnhavn, 1909, p. 1 58 [Amphimetra ensifer). Crinoids of the Indian Uccan, 19 1 2, p. 113, [Amphimetra ensifer). Locality. — Singapore. 7. Amphimetra laevipinna (P. H. Carpenter). P. II. CARPENTER. Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 502 [Antedon laevipinna). "Challenger" Reports. Comatulac, 1S88, p. 206 (Ante Jen laevipinna, in key . Hamann. Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, p. 15S0 [Antedon laevipinna . ,\. II. CLARK. Proc. Biol. Soc. Washington, vol. 21, 1908, p. 2:3 [Himerometra schlegelii, 10-armcd specimen). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 .Amphimetra milberti, part, and Amphi- metra schegelii (sic), pari . Vidensk. Medd. fra den naturhist. Forening i Kobcnhavn. 1909, p. 15S [Amphimetra schlegelii, part). Smithsonian Miscellaneous Collections, vol. 60, 1912, X" 10, pp. 15, 17 (Amphimetra laevipini Crinoids of the Indian Ocean, 1912, p. 11 1 (Amphimetra schlegelii, part; Amphimetra milberti. record from Canton, Chin; Proc. Biol. Soc. Washington, vol. 26, 1913, p. 179 (Amphimetra laevipinna). Localities. — Canton, China P, II. Carpenter; A. II. Clark ; Japan A. II. Clari tlity A. II. Clark s9 8. Amphimctra papuensis A. H. Clark. A. H. Clark. Die Fauna Südwest-Australiens, vol. 3, 191 1, Lief. 13, p. 459 [Amphimetra discoidea; records from New Guinea). Crinoids of the Indian Ocean, 1912, p. 111 {Amphimctra schlegelii, part; records from New Guinea, Tonga and Fiji). Smithsonian Miscellaneous Collections, vol. 61, 19 1 3, N° 15, p. 25 {Amphimetra papuensis). Localities. — Port Moresby and Hood Lagoon, New Guinea, Tonga and Fiji (A. H. Clark). 9. Amphimctra pinniformis (P. H. Carpenter). P. H. Carpenter. Notes from the Leyden Museum, vol. 3, iSSr, pp. 175, iSo {Antedon pinniformis). BELL. Proc. Zool. Soc. London, 1882, p. 533, 534 [Ante Jon pinniformis). P. H. Carpenter. Proc. Zool. Soc. London, 1882 (1883), p. 746 {Antedon pinniformis). "Challenger" Reports. Comatulae, 1S88, pp. 193, 378 {Antedon pinniformis). Hamann. Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, 1907, Abt 3, p. 1579 {Antedon pinniformis). A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 {Oligometra pinniformis). Notes from the Leyden Museum, vol. 33, 191 1, p. 182 {Amphimetra pinniformis). Crinoids of the Indian Ocean, 191 2, p. 113 {Amphimetra pinniformis). Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 25 {Amphimetra pinniformis). Localities. — Andai, New Guinea (P. H. Carpenter; A. H. Clark); Holothuria Bank, northwestern Australia, 15 fathoms (A. H. Clark). Doubtful Species of Amphimetra. 10. Amphimctra milbcrti (J. Muller). J. MULLER. Monatsber. d. k. preuss. Akad. d. Wiss., 1846, p. 178 {Comatula [Alecto] milberti). Abhandl. d. k. preuss. Akad. d. Wiss., 1847 (1849), p. 255 {Comatula [Alecto] milbcrti). DUJARDIN et HüPÉ. Hist. nat. des zoophytes. Échinodermes, 1862, p. 202 {Comatula milbcrti). Verrill. Trans. Connecticut Acad. Arts and Sci., vol. 1, 1867, p. 341 {Antedon milberti). POURTALÈS. Buil. Mus. Comp. Zool., vol. 1, 1869, p. 356 {Antedon [Comatula] milberti). P. H. Carpenter. Trans. Linn. Soc. (Zool.), (2), vol. 2, 1879, p. 29 {Antedon milberti). BELL. Proc. Zool. Soc. London, 1882, p. 534 {Antedon milberti). P. H. CARPENTER. Proc. Zool. Soc. London, 1882 (1883), p. 746 {Antedon milbcrti). "Challenger" Reports. Comatulae, 1888, p. 194 {Antedon milbcrti, part). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, part 3, p. 356 {Himerometra milberti, part). HAMANN. Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, 1907, Abt. 3, p. 1580 {Antedon milbcrti, part). A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 {Amphimetra milberti, part). Crinoids of the Indian Ocean, 191 2, p. iri {Amphimetra milbcrti, part). Remarks. — By some mischance I overlooked Müller's type of this species when I was studying the collections at Paris. Carpenter says "binder this name [milberti) I have united the two species that were found by Muller in the Paris Museum with the MS. names "Comatula Milbcrti' and "Comatula JacquiuotC respectively, which had been given to them by Valenciennes. They are each based upon single specimens which I was able to examine carefully in 1876, and again in 1880: and SIBOGA-EXPKDITIE XlAld. 12 9° : >ubsequent studj of a considerable amount of material obtained 1>\ H.M, S.S. 'Challenger' and 'Alert', and also bj Dr J. Andei ■ I R S. of the Calcutta Museum, lias convinced me that the two types are really identical. Muller hardly ever made any comparison of his spi with one another, but sim|>ly contented himself with descriptions, leaving his readers to determine the real points of difference between his various species The differences between Comatula erti and Comatula jacquinoti as ibed by Muller, are in realitj exceedingly slight. The number of cirrus joints, the character of tin- radials and of the arm joints, the colour, and even the si \ identical in the two types. Comatula milberti has twenty-five to thirty ^irri with the spines transverse, while in Comatula jacquinoti there are twenty-two cirri with the spines directed forwards. In Comatula milberti the syzygial interval is eight or nine joints, and the second, third and fourth pinnules are the largest, while in Comatula jac- the syzygial interval is three to six joints and the first three or four pinnules are 'starker'. Neither of these characters, however, nor even the combination of them, can be regarded as <>( specific valui cially when we remember that each of Müller's species was based upon a >ii :cimen. That of Comatula jacquinoti had been obtained at Céram by the expedition of d'ÜRVlLLE in the -Zelee" (1841), while the form which Muller described under the specific name milberti had previously received it from Valenciennes in honour of M. Milbert of Xew York. who had given it to the Paris Museum; and it was possibly for this reason that the type i as coming from North America. Under these circumstances Valenciennes, and after him Muller, were perhaps a little predisposed to regard it as distinct from the Comatula jacquinoti of Ceram, which Muller described along with it and in such nearly identical terms". < >n the basis of Carpenter's statement we would be justified in considering jacquinoti a synonym of milberti, as he did. But unfortunately he included under the name milberti in the "Challenger" report, in addition to jacquinoti, the species which we now know as mollcri and discoidea, later adding laevipinna. It is by no means certain, therefore, that according to the present standards jacquinoti would be considered identical with milberti. What the latter really is must be left for future investigation to determine. Locality. — Supposed to be North America; the type was brought from Xew Vork; but the genus, as well as the family to which it belongs, is exclusively Indod'acific. 11. Amphimeira sinensis (Hartlaub). HARTLAUB. Mem. Mus. I omp. Zool., vol. 27, 1912, N°4, p. 378, pi. 1 3, fig. 4 (Antedon sinensis). A. H. Clark. Proc. Biol. Soc. Washington, vol. 26, [913, p. 179 (Amphimetra sinensis). Remarks. — Dr. Hartlaub places this species near Amphimetra milberti, but from the description it would appear to belong to the Colobometridae, falling possibly in the genus Decametra. Localitv. — Hong Konjj. 1 12. Amphimetra tessellata (J. Muil J. MULLER. Monatsber. d. k. preuss. Akad. d. Wiss., 1S41, p. 184; Archiv für Naturgesch., (.1, I. p. 144 (Alecto tessellata). Abhandl. d. k. preuss. Akad. d. Wiss., 1841 (1843), p. 224 (Alecto tessellata). 9i J. Muller. Abhandl. d. k. preuss. Akad. d. Wiss., 1847 (1849), p, 251 [Comatjila tessellata). DujARDlN et HUPÉ. Hist. nat. des zoophytes. Échinodermes, 1862, p. 202 {Coma/iila tessellata). WWILLE Thomson. Phil. Trans. Roy. Soc., vol. 155, 1865, p. 537 {Antedon tesse/latus). P. H. CARPENTER. Trans. Linn. Soc. (Zool.), (2), vol. 2, 1879, p. 29 (Comatula tessellata). -'Challenger" Reports. Comatulae, 1888, p. 193 {Antedon tessellata). Hamann. Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, 1907, Abt. 3, p. 1580 {Antedon tessellata). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, part 3, p. 356 {Himerometra tessellata). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (Amplümetra [?] tessellata). Crinoids of the Indian Ocean, 1912, p. 282 {Alecto tessellata). Remarks. — The type of this species is at Bamberg; it has not been examined by any one since Muller. From the very short description it cannot be definitely assigned to any particular species. Locality. — India. Homalometra A. H. Clark. 1. Homalometra deuticulata (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 18S8, p. 130, pi. 22, figs. 1, 2 {Antedon deuticulata). A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, part 3, p. 349 {Nanometra denticttlata). Crinoids of the Indian Ocean, 1912, p. 113 {Amplümetra denticulata). Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 25 {Amplümetra denticulata). Stat. 167. 2°35'.5 S., 131 26'. 2 E. 95 Metres. 1 Ex. The centrodorsal is very thin, discoidal, with a broad, very slightly convex, dorsal pole 1.5 mm. in diameter which bears numerous very small scattered tubercles among which, about the border, are larger irregular flattened tubercles, frequently surrounded by a circle of the smaller ones, apparently indicating the location of obsolete cirrus sockets. The cirrus sockets are arranged in a single slightly irregular marginal row. Cirri XIII, 27 — 29, 25 mm. to 27 mm. long, very slender, gradually and slowly tapering to a point, only slightly and irregularly curved. The first segment is very short, the second about twice as broad as long, the third from about as long as broad to half again as long as broad, the fourth or fifth and following about four times as long as broad, becoming slightly shorter (from two and one half to three times as long as broad) toward the end of the second third of the cirrus, and longer again terminally. The longer cirrus segments are very slightly constricted centrally ; those in the outer third of the cirri have the ventral and dorsal profile more nearly straight. The terminal claw is very long and very slender, about as long as the preceding segment, with the tip more or less curved downward. The proximal edge of the radials, adjacent to the centrodorsal, is bordered by a row of small rounded bead-like tubercles, and there are smaller and less conspicuous tubercles scattered over their surface in the angles of the calyx. The IBrx are very short, more than four times as broad as long; the IBr., (axillaries) are low triangular, twice as broad as long. 92 The UBr series only one present) is 4 (3 1 Hie ossicles ol the [Br series and the first t\\<> brachials have slight lateral extensions, and are broadly "wall-sided" as far as the base oi I',. The eleven arms are 90 mm. long. The first brachial is very short, about four times broad as long, only slightly wedge-shaped; the second is irregularly quadrate, about three times as broad as the median length; the third and fourth form a syzygial pair which is remarkable lor its extreme shortness, being about three times as broad as long, slightly longer inwardly than outwardly, the hypozygal oblong, the epizygal wedge-shaped ; the next four brachials are nearly oblong, with the distal border produced ; the following brachials are remarkably uniform, very short, slightly wedge-shaped, aboul tour times as broad as the median length, in the middle of the arm becoming about three times as broad as long, and at the arm tip about a^ long as broad. When the arm is viewed trom the side the dorsal profile of the brachials, though approximately straight, is seen to make a considerable angle with the axis of the arm that the profile of the arm as a whole is very strongly serrate. The prominent distal edges lials are verj finely spinous. 1' is - mm. long with 22 segments, slender, becoming very delicate distally: the first groent is much broader than long, the following increasing in length and becoming about .is long as broad on the eighth and twice as long as broad terminally. the second to fitth have a high carinate process, the «rest of which is parallel with the longitudinal axis of the segments. the tirst bears a similar, but less marked process: the sixth bears a triangular keel proximally high as the keel on the preceding segment but running to a point distally: the sixth and following segments increase in diameter from the proximal to the distal end. which makes the latter very prominent; the segments bevond the eighth are low triangular in section, with a more or less rounded dorsal ridge. 1'. is 9 mm. long with about 20 segments. similar to 1', but slightly larger with proportionately slightly longer segments, these becoming about three times as long as broad distally ; the second to fourth segments are carinate, like the second to fifth in 1',: the fifth has a triangular keel like the sixth in Px; the second and following segments have the distal dorsal corner swollen and slightly produced. I' is 12 mm. long with tS or 19 jments, much larger than the preceding; it tapers more rapidly in the first four segments than beyond, and remains rather stilt" distally; the tirst segment is irregularly triangular, not quite twice as broad as long, the second is approximatel) oblong, about twice as broad as Ion-, the third is slightly broader than long, tin- fourth is about one third again as long as broad; the following gradually increase in length, in the outer fourth of the pinnule becoming three times as long as broad or even longer; the tirst segment bears a dorsal tubercle; the second- fourth have a narrow straight edged carinate process; the fifth bears a narrowly carinate process in the proximal half; on the second there is a slight projection of the dorsal distal angle which rapidly increases in size, becoming on the fourth and following a very prominent, though narrow, projection of the distal dorsal angle involving about the «.listal fourth of the dorsal edge, which is armed with line spines. \\ is about 7 mm. long with 13 segments, and tapers more rapidly in the first four segments than subsequently ; it resembles 1' but is proportionately smaller with the projection of the distal dorsal angles of the segments much less marked and the proximal ily very slightly carinate. 1' is o mm. Ion- with 1;, segments which become about 93 as long as broad on the fourth and on the eighth and following from three to four times as long as broad, with the distal dorsal angles slightly produced. The distal pinnules are 8 mm. long with 17 — 19 segments most of which are about three times as long as broad, smooth and cylindrical, without produced or spinous distal ends. In life this individual was banded light lavender and light yellow, the bands being from 3 mm. to 4 mm. in width, thus resembling strongly P ectinometra jlavopurpurea \ the colour in spirits is white. IV. Family Stephanometridae A. H. Clark. Genus Stephanometra A. H. Clark. Key to the Species of the Genus Stephanometra. a1 Outer cirrus segments with long and prominent dorsal spines b1 33 — 40 arms 110 mm. to 120 mm. long; 25 — 30 cirrus segments; first six pinnules enlarged, stiffened and spine-like, gradually decreasing in length beyond the second or third (India t o the M a 1 a y A r c h i- pelago and the Philippine Islands) echinus *) \y 16 — 24 arms 60 mm. to 70 mm. long; 20 cirrus segments; first three to five pinnules stiffened and spine-like (Singapore to the Philip- pine Islands and Xew Britain) tenuipinna a2 Outer cirrus segments carinate dorsally, without dorsal spines b1 Pj stiffened and spine-like, resembling Pn but somewhat smaller ; 1 2 arms 35 mm. long; 15 cirrus segments (Moluccas to Borneo). . spinipinna \r Pj slender, flexible, delicate and flagellate, much smaller and weaker than the enlarged and stiffened P3 c1 Pg the only pinnule which is enlarged and stiffened d1 P2 much enlarged and stiffened, usually more or less straight, ending distally somewhat abruptly in a strong stout point; it is composed of 11 — 15 (usually 12) segments, of which the fourth-fifth are typically markedly the longest (A n d a m a n Islands to Singapore, the Philip pi nes, the Malay Archipelago, New Caledonia, Fiji, and the Tonga and Caroline Islands) monacantha ~) d" P3 somewhat less enlarged and stiffened, usually more or less strongly recurved, becoming very slender and delicate distally, though not flagellate; it is composed of 15—20 segments of which the fourth-fifth are not especially noticeable (M a d a- i] Synonym Stephanometra eoronata A. H. Clark. 2) Synonyms Antedon fiavomaculata Bell and Himerometra aaita A. II. Clark. scar, the Seychelles and Rodriguez to Ceylon and southern India; Lesser Sunda [slands and northAustralia) indüa1) ■ 1' and sometimes one or more of the folio wing pinnules resémbling 1' . though usually shorter d1 1' and P the only pinnules which are enlarged, stiffened and spine-like (Red Sëa ?]; Ceylon to Singapore and New Guinéa, and the Philippine, Caroline, Pelew, Admiralty, Sol om on and Loyalty I slands) . . spüata*) d; P. to P, or P. enlarged, 'stiffened and spine-like (Philip- pines tn Java, the Moluccas and the Solomon I si and si oxyacantha i. Stephanometra echinus (A. 11. Clark). A. II. CLARK. Smithsonian Miscellaneous Collections (Ouarterly Issue), vol. 52, 1908, part 2, ;>. 218 (Himerometra echinus). — Proc. I*. S. Nat. Mus., vol. 36, 1909, p. 639 (Stephanometra corona/,/ . The Crinoids of the Indian Ocean, 1912, p. 132 (Stephanometra echinus); p. 133, fig. 13, p. 134 (Stephanometra coronata). Smithsonian Miscellaneous Collections, vol. 60, 191 2, Nn 10, p. 19. Stat. 40. Anchorage off Pulu Kuuassang, Paternoster Islands. 12 Metres. 1 Ex. Stat. 99. 6°7.;\'., 12026 K. 16—23 Metres. 1 Ex. The specimen from Stat. 40 has 28 arms about 85 mm. long; the cirri are XVI, 22 — 24, 19 mm. long; the eighth or ninth is a transition segment; P, is 11 mm. long with 12 segments; 1' is 1 2 mm. long with 11 segments: 1' is 9 mm. long with 9 segments; P4 is 7 mm long with 9 segments; P is 5 mm. long with 9 segments, slightly stiffened. The first four pinnules are all stift" and spinedike, and are enlarged in proportion to their length. The colour is dull whitish, with narrow bands of yellow brown on the arms and cirri. From Stat. 99 there is a small specimen with 29 arms; it is a uniform dull light yellow in colour. 2. Stephanometra oxyacantha (Hartlaub). HARTLAUB. Nova Acta Ksl. Leop.-Carol. deutschen Akad. der Xaturforsch., vol. 58, [891, X" [, p. 55, pi. 3, figs. 35, 37 (Antedon oxyacantha). A. 11. CLARK. Records of the Australian Museum, vol. 9, 1912, X" 1, p. 82, REICHENSPERGEK. Abhandl. der Senck. naturfoisch. Ges., vol. 35, 1913, Heft i, p. 102 phanometra oxyacantha). Enkhuizen Island, near Batavia, Java. 4 Hx. Stat. .; X.. 120 26 ]•".. 16 — 23 Metres. 1 Ex. 1) II. I . Maër Isl irnegie Institution of Washington l'ublication - II Carpenter, and mlha 11. I.. Clark. 95 One of the specimens from Enkhuizen Island has 30 arms 135 mm. long and cirri XXXV, 24 — 25, 30 mm. long. P, is 11 mm. long with 20 segments, very slender and delicate; the outer segments are three times as long as broad. P2 is 15 mm. long, stiff and spine-like, with 12 segments. P„ is 14 mm. long with 11 segments, resembling P,. P+ is 10 mm. long with 1 1 segments, resembling P3. P. is 7 mm. long with 9 segments, of the same character as the preceding. The following pinnules are short. P2 is very slightly stouter than P8. The other specimens are similar. The example from Stat. 99 has 31 arms about 1 10 mm. long; the cirri are XXIV, 24 — 29 (usually 24 — 26),- 25 mm. to 30 mm. long; P: is 12 mm. long, very delicate, with 20 segments of which the outer are three times as long as broad. P2 is 15 mm. long, stiff and spine-like with 13 segments. P8 is 14 mm. long with 12 segments, resembling P, ; Pt is 9 mm. long with 10 segments, resembling P„ and P3, but proportionately smaller; P5 is 6 mm. long with 9 segments, of the same character as the preceding. P6 is soft and delicate, 4.7 mm. long with 9 segments; the following pinnules are similar. 3. Stephanometra spicata (P. H. Carpenterj. P. H. CARPENTER. Notes from the Leyden Museum, vol. 3, 1SS1, p. 190 {Antedon spicata). Bell. Proc. Linn. Soc. New South Wales, vol. 9, 1884, p. 497 (Antedon spicata). P. H. Carpenter. "Challenger" Reports. The Comatulae, p. 230, pi. 40 {Antedon marginatd); p. 232, pi. 45, figs. 2, 3 (Antedon tuberculatd). A. H. Clark. Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 169 (Stephanometra marginatd). Notes" from the Leyden Museum, vol. ^^< *9ll> P- 183. Records of the Australian Museum, vol. 9, 191 2, N° 1, p. 84. Proc. U. S. Nat. Mus., vol. 43, 19 12, p. 396 (Stephanometra tuberculatd). Smithsonian Miscellaneous Collections, vol. 60, 191 2, N° 10, p. 20 (Stephanometra tuberculatd). Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 28 (Stephanometra tuberculata and S. marginatd). H. L. Clark. Carnegie Institution of Washington Publication N° 212, 191 5, p. 103 (Stepha- nometra stypacantha). Stat. 99. 6°7'.sN., i20°2Ó'E. 16 — 23 Metres. 1 Ex. This specimen has 20 arms 85 mm. long; the cirri are XXV, 22 — 23, 20 mm. long; P3 is comparatively short, 1 1 mm. long with 15 segments; P3 is 8 mm. long with 13 or 14 segments. 4. Stephanometra spinipinna (Hartlaub). Hartlaub. Nova Acta Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, N° 1, p. 61, pi. 4, figs. 42, 44 (Antedon spinipinna). Stat. 81. Pulu Sebangkatan, Borneo Bank, 34 Metres. 1 Ex. Stat. 89. Pulu Kaniungan Ketjil. 1 1 Metres. 1 Ex. The specimen from Stat. 81 has 31 arms about 90 mm. long; the cirri are XXIV, 22 — 23, 20 mm. long; P3 is 10 mm. long with 18 segments; P„ is 12 mm. long with 12 segments; Ps is 10 mm. long with 11 segments; P4, which is of the same character as the preceding, is 8 mm. lone with 10 segments. The individual from Stat. 89 has 25 arms about 80 mm. long; the cirri are XXIII. 22 — 23, 15 mm to 20 mm. long; P, is 11 mm. long with 20 segments of which the first two are about as long .is bröad, the third is longer than broad, and the remainder much elongated; the pinnule is slender, but very stiff; I'. is ii mm. to 12 mm. long, stouter than P. with 13 segments; 1' is 9 mm. long with 10 segments; P. which resembles the preceding pinnules, is 5 mm. long with 9 segments. 5. Stephanometra monacantha illartlaub). Li : .! \. Catalogue Mus. GodeflFroy, vol. 5, 1874, p. [90 {Antedon protectus, part). ;n Carpenter, Trans. Linn. Soc. (Zool.), series 2, vol. 2, p. [9 {Antedon protectus, part). HARTLAUB. Nova Acta Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, \ .. p. 59, pi. 3, fig. 38 (but not fig. 33) {Antedon monacantha; the specimen mentioned m Torres Straits represents S. indica). 5oc. London, 1894, p. 400 {Antedon flavomaculata). A. II. Clark. Buil. Mus. Com. Zool. vol. 51, 1908, N" 8, p. 242 {Himerometra acu Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 168. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 220 . meromelra monacantha). Buil. du Mus. d'hist. nat., Paris, ion. X" 4, p. 252. HARTLAUB. Memoirs Mus. Comp. Zool., vol. 27, 19 12. X" 4, p. 412 (Antedon monacantha). A. II. CLARK. Smithsonian Miscellaneous Collections, vol. 60, 1912, N" 10, p. 21. The Crinoids of the Indian Ocean, 1912, p. 136, fig. 14, p. 137. Smiths.mian Miscellaneous Collections, vol. 6l, 1 9 1 3, X" 15. p. 29. Stat. 89. Pulu Kaniungan Ketjil. 1 1 Metres. 1 1 Ex. Stat. 96. Southeastern side of the Pearl Bank, Sulu Archipelago. 15 Metres. 1 Ex. X. 250. Anchorage off Kilsuin, western coast of Kur Island. 20 — 45 Metres. 1 Ex. All of the specimens from Stat. 89 are small. One has 15 arms 40 mm. long: the cirri have 17 segments of which the proximal are proportionately more slender than in adults-, P„ is proportionately more slender than in the adults, with to segments, which are proportionately longer, and is slightly recurved; P resembles the following pinnules. Another has 20 arms 70 mm. long; the cirri are about [6 mm. long with 19 segments; P, is 8 mm. long with it segnv-nts; P resembles Pr A third has iS arms 65 mm. long; the cirri are 15 mm. long with 19 segments; I', is 9 mm. long with 11 segments. Of the remaining specimens three have is arms and tour have 14 arms; in one of the latter P., has 12 segments. One individual not enumerated above is small and much broken. The example from Stat. 96 has 17 arms. and is undergoing adolescent autotomy; P, segments of which the first two are about as long as broad and the third is twice as broad. ecimen from Stat. 250 which was dredged at 27 Metres) has 14 arms 55 mm. long; the cirri are 11 mm. long; 1' is 6.5 mm. long with to 12 (usually 11) segments. [udging from the evidence afforded by the youngesl specimens the proportions ol the ï' pinnules in the ten-armed stage are jusl as. in the adults, bul P is more slender, ewhat recurved, with more prominent articulatie 97 6. Stephcuwmetra indica (E. A. Smith). E. A. Smith. Ann. and Mag. Nat. Hist., series 4, vol. if, 1876, p. 406 {Comatula indica). Phil. Trans. Roy. Soc, vol. 168, 1879, p. 564, pi. 51, figs. 3, 30 — b [Comatula indica). BELL. Proc. Zool. Soc. London, 1 888, pp. 384, 387 {Antedon palmata, part). HaRTLAUB. Nova Acta der Ksl. Leop.-Carol. deutschen Akademie der Naturforsch., vol. 58, 1891, N" 1, p. 59 {Antedon monacantha, part; specimen from Torres Strait). THURSTON. Madras Government Museum Bulletin, 1894, N° 1, p. 28; N" 2, p. 114 (Antedon palmata, part). Bell. in Gardiner, Fauna and Geography of the Maldive and Laccadive Archipelagoes, vol. 1, 1902, part 3, p. 225 {Actinometra maculata, part). Trans. Linn. Soc. (Zool.), series 2, vol. 13, 1909, part 1, p. 20 [Antedon palmata). A. H. Clark. Buil. du Mus. d'hist. nat., Paris, 191 1, N" 4, p. 252. Proc. U.S. Nat. Mus., vol. 40, 191 1, p. 26. The Crinoids of the Indian Ocean, 1912, p. 135; p. 136 (under 5. monacantha, specimens from off northeastern Ceylon). REICHENSPERGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, Heft i,p. 102 (Stephano- metra monacantha). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 29. H. L. Clark. Carnegie Institution of Washington Publication N°2i2, 191 5, p. 103 (Stephano- m e tra monacantha). Stat. 301. io°38'S., i23°25'.2E. 22 Metres. 1 Ex. In this specimen the 20 arms are 115 mm. long; the fiat dorsal pole of the centrodorsal is 2 mm. in diameter; the cirri are XXXIII, 20 — 21, 20 mm. long; P3 is 15 mm. long with 15 — 16 segments of which the fourth and fifth are the longest; on the inner arms P3 is 12 mm. long, though composed of the same number of segments. Ps is relatively slender, much less spine-like than usual, more flexible basally, becoming very slender distally; the three basal segments are about as long as broad, the fourth about one third again as long as broad; the remaining segments are elongated. This specimen appears to be identical with Hartlaub's specimen of monacantha from Torres Strait. It also agrees with specimens of indica at hand from Ceylon, and with others from Madagascar which I have examined, though the size is somewhat greater. There can be little doubt that the specimen taken by Dr. H. L. Clark at Maër Island, Torres Strait, and recorded by him as 5". monacantha, belongs to this species. V. Family Mariametridae A. H. Clark. Key to the Genera of the Family Mariametridae. a1 Cirri very large and long, with more than 40 (usually 50 — 80) segments b1 Pj on the outer arms greatly elongated and flagellate, more than five times as long as the following pinnules ; division series very narrow, very deep dorsoventrally, and very widely separated Pontiometra b2 Pj only very slightly, if at all, longer than P2, and of the same character; division series nearly or quite in apposition laterally through the extension of their ventrolateral borders Oxymetra SIBOGA-EXPEDITIE XLII b. I', 98 irri short or of moderate length, with less than 40 segments b' 1' and I' similar, and of equal length Liparometra b 1' and I' of unequal length cl 1' markedly longer, and more or less stouter, than 1' or 1', . . Lamprometra r 1' markedly longer than 1'. which in turn is markedly longer than P d1 lateral portions of the dorsal surface of the division series smooth ; division series never carinate, and never with a narrow dark median line; disk naked Dichrometra d lateral portions of the dorsal surface of the division series with a prominent granular, tubercular or spinous ornamentation ; a faint median carination or a narrow dark median line on the division series and arm bases, both often occurring together; disk covered, usually completely, with calcareous plates . . Mariametra Pontiometra A. II. Clark. 1. Pontiometra andersoni (P. H. Carpenter). LÜTKEN. Catalogue Museum Godeftroy, vol. 7, 1879, p. "'. {Antedon poly pus, nomen nudum). ,. Proc. Zool. Soc. London, 1887, p. 140 {Antedon sp.). Proc. Zool. Soc. London, 1SS8, p. 387, footnote {Ante Jon andersoni, nomen nudum). P. H. Carpenter, Journ. Linn. Soc. (Zool.), vol. 21, 1889, p. 306, pi. 26, figs. 1—5; pi. 27, . bitedon andersoni). HARTLAUB. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, N 1. p. 78 {Antedon andersoni). A. II. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 212. - Vidensk. Medd. fra den naturhist. Forening i Kobcnhavn, 1909, p. 165. Buil. du Mus. d'hist. nat, Paris, 191 1, N" 4, p. 252. Smithsonian Miscellaneous Collections, vol. 60, 1912. N° 10, p. 21. Proc. I'. S. National Museum, vol. 43, 1912, p. 397. The Crinoids <>f the Indian Ocean, 1912, p. 138. RGER. Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, Heft 1, p. 103. Stat. 310. 5 E. j^ Metres. 1 Ex. A medium sized specimen with 53 arms about 140 mm. long was secured at this station. Oxymetra A. II. Clark. Key to the Species >>( the Genus Oxymetra. a1 Cirrns segments Ion-, tin- longest about tvvice as long as broad, the distal about ..s long as broad: 50 (49) arms 150 mm. long; cirri 55 mm. to 70 mm. long with 69—7^ segments (Java Si tenuicirra egments shorter, the longest but littl-- longer than broad, the distal twice id as Ion-, or even broader 99 b1 the first four pairs of pinnules very stiff, and spine-like ; 50 (5 l) arms-i 15 mm. long; the extra axillaries are external, so that the arms are arranged in 3, 2, 2, 3 order; the cirri are XXX— XXXV, 50 — óo, 40 mm. long (Philippinelslands) erinacea b" the proximal pinnules, though stiffened, are not spine-like, ending in a delicate, more or less flagellate tip ; 40 arms c1 first four or five pairs of pinnules stiffened and elongated ; PT about as long as Ps, which is markedly longer than Pg; 60 — 80 cirrus segments of which those in the outer half of the cirri bear small dorsal spines (Philippines and New Britain) finsckü1) c2 first six or seven pairs of pinnules stiffened and elongated; Pt markedly shorter than P2 and P.;, which are of the same length and character; 47 — 66 cirrus segments, of which the outer three fourths bear prominent dorsal spines (Andaman Islands to the Philippines). . . arauea,-) 1. Oxymetra tenuicirra (A. H. Clark). A. H. Clark. Arm. and Mag. Nat. Hist., series 8, vol. 10, 191 2, p. 32 [Selenemetra tenuicirra). Smithsonian Miscellaneous Collections, vol. 6o, 1912, N" 10, p. 22, in text [Selenemetra tenuicirra). Stat. 320. 6°5'S., U4°7'E. 82 Metres. 1 Ex. This species is very closely related to O. fiuschii from which it differs chiefly in having more slender cirri with much longer distal segments, which are nearly or quite as long as broad instead of twice as broad as long or even broader as in O. fiuschii, and also longer proximal segments the longest of which are about twice as long as broad instead of only slightly, if at all, longer than broad. The single specimen has 49 arms 150 mm. long; each IIBr series bears two IIIBr series, of which the inner bears an internal IVBr series, so that there are 10 arms to each ray arranged in 2, 3, 3, 2 order. The cirri are XXXV, 69 — 78, 55 mm. to 70 mm long, much more slender than those of O. fiuschii. Pj is 11 mm. long with 20 — 21 segments which become about as long as broad on the fifth or sixth and twice as long as broad distally ; Ps is 12 mm. long with 22 segments, resembling Pr P3 is 10 mm. long with iS segments. Pt is 7.5 mm. long with 13 segments; the distal taper is more marked than in P3. P. is 7 mm. long with 13 segments, slightly more slender than Pp especially in the distal portion. The distal pinnules are 8 mm. long with 1 7 segments. 1) Synonym Hitnerometra gracilipes A. H. * Hark. 2) Synonym Selenemetra viridis A. H. Clark. IOO Lamprometra A. II. Clark. A. 11. CLARK. Proc. Biol. Soc. Washington, vol. 26, 1913, p. 143. Key to the Specii i ol the Genus Lamprometra. a I' verj Ion-, rather stiff, and ver) stout, though tapering gradually t<> a delicate and more or less Aagellate tip; on the outer arms of each IBr series (or on the outer arms of each [IBr series il' the specimen In- very large) 1', is very much larger and longer than elsewhere; 1', is usually much larger and Ipnger than P, or 1' , and the la'tter is usually but slightly longer than \\ (Ceylon to China. Oceania and northeastern Australia, reaching Hong Kon-, the Philippin* , Caroline, Marshall and Hawaiian Islands, Fiji, Tonga and New Caledonia) protectus1) a 1' , though much elongated and somewhat stiffened, is slender and but slightly enlarged, resembling I', in character but of greater length bl basal segments of the proximal pinnules nut carinate ; 1'. more nearly embling I' than 1' Red Sea, and e ast war d to Muscat) . . pa/mata3) 1- basal segments of the proximal pinnules strongly carinate; P., more nearly resembling 1', than 1' (Australia, except the southern coast, and New Guinea) gyges 3) 1 . Lamprometra protectus ( Lütken). 1 J. MULLER. Abhandl. d. k. preuss. Akad. d. Wiss., 1847 (1849), p. 261 (Comatula [Alecto] palmata, part). DUJARD1N et HUPÉ. Hist. nat. des Zoophytes. Échinodermes, 1862, p. 208 (Comatula dh'idua and C. polyactin LÜTKEN. Catalogue Mus. Godeflfroy, vol. 5, 1874, p. 190 [Antedon protectus). - in 1'. II. Carpenter, Trans. Linn. Soc. (Zool.), series 2, vol. 2, 1879, p. 19 (Antedon protectus). 1'. IL CARPENTER. Notes from the Leyden Museum, vol. 3, 1881, p. 187 (Anti-don brevi- cuneala); p. ntedon laevicirra); p. [92 (Antedon protecta). Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 504 (Antedon aequipinna); p. 505 (Antedon imparipinm Bell. Proc. Zool. ndon, isss, pp. 384, ^Sy (Antedon palmata). 1'. II. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 225 (Antedon protecta) ; p. 233, pi. 45, fig. 1 (Antedon conjungens) p. 235, pi. 47, figs. 1— 3 (Anti-Jon similis); p. 236, pi. 4*. 1 ' ! ■ Intedon occulta). Bl LL. Willey's Zoölogical Results, vol. 2, 1889, p. 133 (Antedon indica). 1'. 11. Carpenter. Journ. Linn. Soc. Zool.), vol. 21, 1889, p. 311 (Antedon conjungens). HARTLAUB. Nachr. 'e ', ttin n, Mai 1890. p. 176 (Antedon lepida); p. 180 (Anti-Jon pro- tecta); p. 181 [Ante Jon amboinen 1 irdin el Hupé, Antedon aequipinna, .1. irevicuneata^ A. conjungens, A. H. ind .1. sublilis Hartlaub; Antedon \. 11. i l.irk : and / 1 1. I . i'lark. umi Antedon kluntingeri Hartlaub. Hartlaub. IOI Hartlaub. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, N° 1, p. 49 {Antedon palmata, specimens other than those from the Red Sea); p. 63 {Antedon imparipinna); p. 68, pi. 3, fig. 31 ; pi. 4, fig. 39 {Antedon brevicuneata). THURSTON. Madras Government Museum Bulletin, 1894, N" 1, p. 28; N" 2, p. 114 {Antedon palmata). Hartlaub. Buil. Mus. Comp. Zool., vol. 27, 1895, N° 4, p. 151 {Antedon subtïlis). Chadwick. Report Ceylon Pearl Oyster Fisheries, part 2, 1904, Suppl. Report XI, p. 155, plate, figs. 3 — 5 {Antedon okelli). A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, p. 356 {Himerometra helianthus). Buil. Mus. Comp. Zool. vol. 51, 1908, N" 8, p. 242 {Himerometra heliaster). Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 220 {Himerometra protectus). Zool. Anzeiger, vol. 34, 1909, N° 11/12, p. 367 {Duhrometra protectus and D. palmata). - Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 172 {Dichrometra protectus). Notes from the Leyden Museum, vol. 33, 191 1, p. 186 {Dichrometra protectus and D. lacviarra). - Buil. du Mus. d'hist. nat., Paris, 191 1, N° 4, p. 253 {Dichrometra protectus). - Records of the Australian Museum, vol. 9, 191 2, N" r, p. 84 {Dichrometra protectus). Records of the Indian Museum, vol. 7, 191 2, part 3, N° 26, p. 269 {Dichrometra protectus). Smithsonian Miscellaneous Collections, vol. 60, 1912, N° 10, p. 24 {Dichrometra protectus). Proc. U.S. National Museum, vol. 43, 1912, p. 397 {Dichrometra protectus). Hartlaub. Memoirs Mus. Comp. Zool., vol. 27, 19 12, N" 4, p. 409 {Antedon brevicuneata); p. 410 {Antedon similis). A. H. Clark. Crinoids of the Indian Ocean, 1912, p. 143, fig. 17, p. 145; fig. 18, p. 146 {Dichrometra protectus); p. 147 {D. laevicirra and D. similis); p. 148 {D. tenera, part, and D. palmata, part); p. 149 {D. subtïlis and D. heliaster); p. 150 {D. occulta). Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 31 {Lampromctra protectus). REICHENSPERGER. Abhandl. d. Senk. naturforsch. Gesellsch., vol. 35, 191 3, part 1, p. 103 {Dichrometra palmata); p. 104 {Dichrometra protectus). H. L. Clark. Carnegie Institution of Washington Publication N° 212, 191 5 , p. 104 {Lampro- mctra brachypecha and L. callipecha). Stat. 78. Lumu Lumu Shoal, Borneo Bank. 34 Metres. 9 Ex. Stat. 79b. Pulu Kabala Dua, Borneo Bank. 22 Metres. 2 Ex. Stat. 81. Pulu Sebangkatan, Borneo Bank. Reef. 3 Ex. Stat. 89. Pulu Kaniungan Ketjil. 1 1 Metres. 1 Ex. Stat. 96. Southeastern side of the Pearl Bank, Sulu Archipelago. 15 Metres. 3 Ex. Stat. 99. 6°7'.5N., I20°2Ó'E. (Anchorage off North Ubian). 16 — 23 Metres. '1 Ex. Stat. 115. Eastern side of Pajunga Island, Kwandang Bay. Reef. 1 Ex. Stat. 125. Anchorage off Sawan, Siau Island. 27 Metres. 1 Ex. Stat. 164. i°42'.5 S., I30°47'.5E. 32 Metres. 1 Ex. Stat. 174. Waru Bay, northern coast of Ceram. Reef. 2 Ex. Stat. 193. Sanana Bay, eastern coast of Sula Besi. 22 Metres. 1 Ex. Stat. 209. Anchorage off the south point of Kabaëna Island. 22 Metres. 1 Ex. Stat. 231. Amboina. Reef. 2 Ex. Stat. 248. Anchorage off Rumah Lusi, northern point of Tiur Island. Down to 54 Metres. 1 Ex. Stat. 279. Rumah Kuda Bay, Roma Island. 36 Metres. 1 Ex. Stat. 303. Haingsisi. Reef. 4 Ex. The details of the specimens from Stat. 78 are as follows: one has 21 arms 75 mm. long; P„ on the outer arms is very large; all of the proximal pinnules are considerably enlarged; 102 a second has :i arms 70 mm. long; I' i> greatly enlarged on the outer side of the [Br series, where it stands out witli great prominence ; tin- others are similar; n the third and on the eighth and following twice as long .is broad; the pinnule is very slender and delicate. P is 1 2 mm. long with 24 segments, and is exactlj likt- 1' I' is very slender, 1: mm. long with 21 segments of which the firsl is very short, the second is nearlj .1- long as broad, the third is slightly longer than broad, and the following slowly increase in length so that the ninth and following are nearly two and one half times as long as broad, 1', is '> mm long with 15 segments, not quite so stout basally as 1' and tapering more rapidly The proximal pinnules, though very slender, are all slightly stiffened. The disk is completely covered with a pavement of rather smal! irregular plates. The colour is light gray, with very narrow black hands at the articulations ; the cirri are white, the distal half light purple ventrally, this increasing in extent distally. The second specimen has 23 arms; the division series are broad and sharply tlattened laterally; the distal ends of the ossicles of the division series and of the brachials are everted, producing a curiously rough appearance. The disk is completely covered with smal! rounded calcareous plates. It is quite possible that L. regalis is really the young of this species. Dichrometra A. II. Clark. Key to the Species of the Genus Dichrometra. 1 'istal cirrus segments smooth dorsally, or with a slight dorsal carination, slightly broader than long; about 20 arms (southernjapan) döderleini*) a 1 >istal cirrus segments bearing dorsally tubercles or spines b1 distal cirrus segments much longer than broad, bearing a prominent spine in the centre of the dorsal surface; about 20 arms (Java Sea). . . . tenuicirra b'3 distal cirrus segments broader than long, usually very much so; 29 — 50 arms c1 the distal cirrus segments, which are not greatly broader than long, bear obsolete dorsal tubercles; Pt is about as long as Ps ; 40 arms Moluccas) bimaculata c the distal cirrus segments, which are much broader than long, bear prominent dorsal spines d1 synarthrial tubercles prominent, though swollen and broadly roundi d, and the lower brachials slightly swollen, so that the proximal portion of the animal presents a rugged and rugose appearance; 1', about as long as, or longer than, I' ; elongated proximal pinnules with the component segments short, in large specimens slightly longer than broad, in small specimens nol becoming twice as long as broad until at least the middle of the pinnule (Singapore and the Malay Archipelago to Hong Kon-, the Pelew and the A d- miraltylslands flagellata '1 1 Synonym ' ' rk. I. Mttller l.utkcn. io5 d* arm bases j^erfectly smooth; synarthrial tubercles, if present, narrow and conical ; P4 much shorter than P3 ; elongated proximal pinnules more slender, with the component segments more elongated, beyond the seventh to the tenth twice as long as broad, and distally three times as long as broad e1 narrow and conical synarthrial tubercles present; P3 2 mm. to 3 mm. longer than P2; proximal pinnules stift" and wiry; habit robust; 45 — 47 arms (sou thern J apan) gotoi e3 no synarthrial tubercles; P3 0.5 mm. to 1.5 mm. longer than P2; proximal pinnules delicate; habit slender and delicate; less than 42 arms f1 34 — 42 arms 1 10 mm. to 120 mm. long; cirri 30 mm. long with 29 — 35 (usually 33) segments; P., and P3 with 31 — 34 segments; division series and arms as far as the third brachial thickly sprinkled with minute white dots (e ast coast of India) . ciliata f2 29 arms about 85 mm. long; cirri 15 mm. to 18 mm. long with 23 — 29 segments; P2 and P., with 22 — 25 segments; division series and arm bases without white dots (southeastern Africa and Madagascar) afra 1. Dichroiuetra tenuicirra A. H. Clark. A. H. Clark. Ann. and Mag. Nat. Hist., series S, vol. 10, 1912, p. 34. Stat. 318. 6°36'.5S., ii4°S5'.5E. 88 Metres. 1 Ex". Stat. 320. ó°5'S., U4°7'E. 82 Metres. 25 Ex. The centrodorsal is low hemispherical with very sloping sides ; the dorsal pole is slightly convex, flat, or very slightly concave, 1.5 mm. to 2.5 mm. in diameter; the cirrus sockets are arranged in two, or in two and a partial third, irregular and crowded marginal rows. The cirri are XIX — XXVIII, 25 — 28 (usually 26), 20 mm. to 25 mm. long, slender and delicate ; the tenth-twelfth (usually the tvvelfth) is a more or less marked transition segment ; the first segment is very short, the second twice as broad as long, the third slightly broader than long, the fourth from half again to twice as lone as the median diameter, the fifth from two to two and one half times as long as broad; the following to the ninth, tenth or eleventh are similar; the remainder are slightly shorter, about half again as long as broad ; Fig. 5. the tenth-twelfth and following bear prominent triangular median Lateral view of a cirrus fiom 01 ° a specimen of Dichrometra tenui- spines ; after one or two segments these spines occupy about half of «>ra from stat. 320. x 2. (Cour- . , . , • 11 tesy of the U. S. National Museum). the mid-dorsal line ; the antenor (distal) margin stands out vertically, and is from one half to one third as long as the recumbent side; the hypothenuse, from the apex of the spine to the proximal base, is straight, but its proximal end may be marked by a slight tubercle, or the hypothenuse may be slightly concave, leading from the distal spine S1BOGA-EXPED1TIE Xl.Il/. 14 smaller blunt proximal tubercle; the spines change bul little distally, their bases becoming slightly shorter and their apices consequently sharper, and the hypothenuse straight; the opposing spine is longer than the spines on the preceding segments and more slender, median or sul>- median, nearly or quite erect, nearly or quite equal to the diameter of the penultimate segment in height; the terminal claw is longer than the penultimate segment, very long and slender, slightly and evenly curved; the longer earlier segments have slightly enlarged ends; this less in the spiniferous distal segments, though it is traceable quite to the penultimate. The division series and arms resemble those of D. flagellata, but are much more slender and delicate; the division series and first brachials may be well separated, or they may bc in lateral contact; they are usually not quite in apposition, though they have straight Iateral edges which are usually slightly swollen; the characteristic rugose appearance ut' D. flagellata, due ti> the luw. though prominent synarthrial and articular tubercles is reflected in a delicate and modified form. The arms are [6—23, 70 mm. to 80 mm. Ion-. 1' is from '1.0 mm. to 6.5 mm. lon<_r with 15 — 18 segments of which the first is short, tlu- second nearly as long as broad, the third about as long as broad, and the seventh or eighth and following slightly longer than broad. P3 is 7 mm. long with 22 segments of which the first is short, the second about as long as broad, the third slightly longer than broad, the seventh <>r eighth and following half again as long as broad, becoming twice as long as broad terminallv. the pinnule is very slightly stouter basally than ]',, but tapers less rapidly and more gradually, and is less flagellate distally. Pa is 9 mm. long with 23 segments, resembling Pa but proportionatel) stouter. 1', is 8 mm. long with 20 segments, resembling P.,; the second-fourth ents are sometimes very slightly enlarged. P. is 4.5 mm. long with 14 segments, of the same rharacter as P, but proportionately smaller. P6 is 4.2 mm. long with 13 segments, similar to P.. 1' is 3.7 mm. Ion- with 12 segments, similar to PB. The following pinnules are of about the same length and stoutness, becoming weaker and more delicate distally. The distal pinnules are 6 mm. long, very slender. with 18 — 19 segments. In nearly every detail of its structure this species agrees with D. flagellata \ with the specimen of the latter which served Mi i.i.ir as the type of his Alecto elongata the agreement is especiall) . in the number of cirri, the number of cirrus segments, the number of the cirrus segment which bears the lust dorsal spine, the proportions of the lower pinnules, and the number of their component segments. But the great slenderness of the cirri, which have greatly elongated distal segments serve easily to distinguish it. 2. Dichrometra flagellata (J. Muller). • J. MULLER. Archiv fïir Naturgesch., 1841, I. p. 14? Alecto flagellata); p. 146 [Alecto elongata). Harti VUB. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. ilor Naturforsch., vol. 58, 1891, \" 1. ]). 71. pi. 1. fig. 47 (Antedon elongatc . pi. |. fig. 45 (Antedon flagellata). \. II. Clark. Vidensk. Medd. fra den naturhist. Forening i Köbenhavn, 1909, p. 172. Notes from tin- Leyden Museum, vol. 33, 1911, p. [84. Crinoids <>f tin Indian Ocean, 1912, \>. 150. 107 A. H. Clark. Smithsonian Miscellaneous Collections, vol. 60, 19 12, N" io, p. 22. Proc. U.S. Nat. Mus., vol. 43, 1912, p. 398. Proc. Biol. Soc. Washington, vol. 26, 191 3, p. 181. Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 30. Stat. 43. Anchorage off Pulu Sarassa, Postillon Islands. Up to 36 Metres. 1 Ex. Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 1 Ex. Stat. 213. Saleyer. 1 Ex. Stat. 250. Anchorage off Kilsuin, western coast of Kur Island. 27 Metres. 1 Ex. The specimen from Stat. 43 has the cirri XXI, 27 — 28, 20 mm. to 21 mm. long; the longest segments are about one third again as long as broad; the short distal segments are only slightly broader than long; dorsal spines, which are somewhat smaller than in specimens at hand from Singapore, are developed from the eighth or ninth onward. The 14 arms are 115 mm. long; only one (external) IIIBr series is present. P1 is 8 mm. long with 28 segments. P2 is 11.5 mm. long with 27 segments. P„ is 15 mm. to 17.5 mm. long with 30 — 38 segments. Pi is 9 mm. long with 20 segments on arms arising from a IIBr axillary, and 12.5 mm. long with 27 segments on arms arising from a IIIBr axillary; in the latter case it resembles P.,. The colour is deep purple. The individual from Stat. 144 has 18 arms 90 mm. long; the longest cirri are 16 mm. long with 22 — 24 segments, of which the ninth or tenth and following bear dorsal spines. The example from Stat. 250 has 20 arms 115 mm. long, all of the IIBr series being present; the cirri are XXIV, 24 — 25, 18 mm. long; dorsal spines are developed from the tenth or eleventh segments. P, is 4.5 mm. to 6.0 mm. long. P3 is 7.5 mm. to 9.5 mm. long with 25 segments. P3 is 9.0 mm. to 11.5 mm. long with 21 segments. Pt is 6.0 mm. to 6.5 mm. long with 16 segments. The colour is whitish with broad, frequent and regular bands of purple on the arms which become more closely crowded distally so that the outer portion of the arms is purple with narrow white bands. The large specimen from Saleyer has 40 arms about 100 mm. long, and cirri XXII, 29 — 30, 27~mm. long. It agrees very well with the type at Leyden. Mariametra A. H. Clark. Key to the Species of the Genus Mariametra. a1 Distal cirrus segments much broader than long, bearing long and sharp dorsal spines b1 less than 28 arms; radials and sides of the ossicles of the division series covered with very prominent irregular tubercles or short spines which extend dorsalward at the articulations where they may form narrow bands across the ends of the segments ; ossicles of the division series with a prominent irregular median keel or meclian row of tubercles which becomes less marked on the IIBr series and is absent beyond the arm bases; division series and arms with a prominent purple median line eastern pan ol the Bay of Bengal t<> the Lesser Sunda Islands, and northward i<> the Macclesfield Bank) vicaria ') b' 40 arms; radials and sides of the ossicles of the division series with a fine reeular eranular ornamentation which never encroaches on the dorsal surface; median line of the ossicles of the division series and brachials ipied by a low and narrow, but very regular and very distinct, nation; division series and arm bases without a median purple line uthern Japan toFormosa) mbcannata tuter cirrus segments as long as, or longer than, broad-. dorsal spines minute or absent 1 irri with not more than 30 segments; sides of the ossicles of the division series with prominent tubercles or numerous short blunt spines cirri about one fourth of the arm length; sides of the ossicles of the division series coarsely tubercular; a faint median line of pinkish in the proximal half of the arms; 26 arms (Mol o Strait) . . tuberculata c2 cirri approximately half the arm length ; sides of the ossicles of the division series with irregular and closely crowded short blunt spines; dorsal pole of centrodorsal covered with small tubercles; a median line of dark purple on the division series and arms; [5 arms (Ti mor) tenuipes ba cirri with 40 segments, and nearly half as long as the arms; ornament- ation of the division series reduced to a slight and very inconspicuous roughening of the sides of the ossicles, the dorsal surface being entirely smooth; beyond the second brachial the arms bear a narrow inter- rupted dark purple dorsal stripe which extends nearly their entire length ; about 30 arms (south western Japan) delicatissima 1. Mariametra vicaria (Bell). BELL. Proc. Zool. Soc. London, 1S94, p. 396 (Antillen ? variispina [sic]); p. 400 {Antedon vicaria . ,\. II. CLARK. Crinoids of the Indian Ocean, 1912, p. 141, fig. [6 (Mariametra margaritifera); p. 142. Smithsonian Miscellaneous Collections vol. 61, 1 9 1 5 . N° 15, p. 30. Stat. 4 ;.j S, ri9°4'.6E. (Sapeh Strait). 69 Metres. 1 Ex. < Ine much broken specimen with 28 arms appears to belong to this species 2. Mariametra tuberculata \. II. < lark. A. II. Clark. Ann. and Mag. Nat. Hisl vol. 10, 1912, p. 33. Stat. 51. Molo Strait. 69 91 Metres. 1 Ex. i : 109 The centrodorsal is large, thick discoidal, the dorsal pole slightly convex, 2 mm. in diameter; the cirrus sockets are arranged in two closely crowded and irregular alternating rows. The cirri are XXI, 25 — 27, 20 mm. long, long and rather slender, with a slight distal taper; the first segment is short, the second longer, the third nearly as long as broad, the fourth slightly longer than broad, the sixth and following twice as long as broad; after the tenth the segments slovvly decrease in length so that the last four or five before the penullimate are about as long as broad to one third again as long as broad; the last eleven or twelve bear a slight distal dorsal carination which is low and rises very gradually from the dorsal surface of the segment, but ends rather abruptly distally; it is so slight that the cirri appear practically smooth ; the opposing spine is moderate in size, triangular, arising from the entire dorsal surface of the penultimate segment, terminal, and directed obliquely forward; the distal ends of the cirrus segments are slightly prominent. The radials are almost entirely concealed by the centrodorsal, being only slightly visible in the interradial angles; IBrj very short, almost oblong, five or six times as broad as long; axillaries very short, nearly or quite three times as broad as long; IIBr and IIIBr 2, the latter external; sides of the elements of the division series in close apposition and sharply flattened. The proximal edge of the IBi^ is everted and slightly scalloped; the outer edges of the axil- laries are slightly thickened and everted, but smooth; the lateral third of the exposed surface of both ossicles taken together bears from a dozen to a dozen and a half prominent well rounded and entirely separate tubercles, some of which may be more or less elongate in one diameter; between the tubercular lateral and smooth dorsal surface of the elements of the IBr series there is a more or less marked prominent beaded ridge or row of tubercles which, however, may be absent; the sides of the ossicles of the IIBr series are modified in the same way as those ot the ossicles of the IBr series, but not so extensively. The arms are about 26 in number, 75 mm. long; the proximal outer angle of the first brachial is roughened for some distance inward, and sometimes is more or less tuberculated •, there is a similar modification of the surface of the second brachial, but it is much less extensive; the synarthrial tubercles are small, but rather prominent; the distal edge of the brachials is only very slightly produced. Pj is 7 mm. long with 21 segments, tapering rather rapidly in the proximal fourth, slender from that point onward; most of the segments are about twice as long as broad. P3 is 8 mm. long with 17 — 20 segments of which the first is nearly twice as broad as long, the second nearly as long as broad, the third one third again as long as broad, and the remainder about twice as long as broad ; the second-fifth are narrowly carinate ; the pinnule is basally little, if at all, larger than Plt but it tapers less rapidly, and is slightly less slender distally. P., is 12 mm. long with 16 — 18 segments, slightly stiffened like P., in Lamprometra protcc1us\ it tapers evenly from the base to the tip, and 's larger and stouter than Pa, the latter more nearly resembling P, : the proportions of the individual segments is as in P2; the second-fourth have a slight narrow carination. P4 is similar to P3; it is 9 mm. long with about 16 segments, larger, longer and stouter than P3, and stiffened like P.,. P. is from 4.5 mm. to 5 mm. long with 1 5 segments, small and weak, evenly tapering and becoming very slender distally ; the [10 following pinnules gradually decrease in size, then increasing in length and becoming very slender distall)-. The colour is white, with a faint median line of light pinkish in the proximal half of the arms. 3. Mariametra tenuipes \. 11. Clark. \. 11. Clark. Ann. and Mag. \.it. Hist., series 8, vol. io, 1012, p. 32. St.it. 294. ioijjS., 124 .•;.;i:. 73 Metres. 1 Ex. The dorsal pole of the centrodorsal is slightly convex, 1 mm. in diameter, covered with smal! tubercles. The cirri are XXVI, 24 — 20, 2: mm. long; the firsl segment is short, the second about twice as broad as the median length, the third slightly longer than broad to half again as long as broad; the sixth-eighth are about three times as long as the median diameter; the following gradually decrease in length so that the last ten or eleven are about as long as their distal diameter, or only very slightly longer; the cirri are exceedingly slender; the long proximal segments have slightly prominent ends; slight subterminal dorsal spines appear on about the eleventh segment. The division series and arms in general resemble those of the other species of the genus. One IIIBr series is present, external. The 15 arms are probably about 45 mm. long. The lateral ornamentation of the division series, which occupies the outer third of the exposed surface of the elements of the IHr series thence narrowing distally and disappearing at the base of P,, consists of very numerous small blunt spines, more or less coalescent, which show a tendency to become arranged in horizontal rows. 1', is 6 mm. long with about 16 segments, small and short. Pa is 7.5 mm. long with 19 segments, resemblin^ 1'; but not so stout, though slightly stouter than Pr P.. is 1 1 mm. long with 21 segments, slender, evenly tapering; the first segment is not ciuite so long as broad. the second is about as long as broad, and the fifth and following are about twice as long as broad, becoming more elongated terminally. \\ is 9 mm. long with 19 segments, resemblin- I' The colour is white with a narrow median line on the division series and arms of purple; the cirri are light purplish. VI. Familj C idai .\. 11. Clark. Key to the Genera ol the Family Colobometridaë. a' I', (the first inner pinnule) present on all the arms more than 10 arms; size medium or large; cirrus segments subequal, short, bearing dorsally paired spines or tubercles; P greatly enlarged, 1 1 1 much larger and stiffer than Pj or Ps, recurved and horn-like, the component segments with produced and spinous distal ends .... Cenometra b2 10 arms; size small ; at least the outer cirrus segments nearly or quite as long as broad, bearing dorsally a serrate transverse ridge (sometimes two, a proximal and a distal) or long spines c1 Px shorter, smaller and weaker than P3 ; P3, and usually also P3, elongated, enlarged and stiffened, with the distal edges of the segments produced into spinous overlapping borders, or with the distal portion of the prismatic angles produced into rounded or pointed processes dl 30 or more cirrus segments of which only the basal bear transverse ridges these after the proximal fourth of the cirrus transforming into very long dorsal spines; P3 has at most 12 segments . . Cotylometra d2 25 or fewer (usually about 20) cirrus segments, of which all but the terminal bear transverse ridges ; P3 has at least 15, and usually about 20, segments Oligometra c3 Pj the longest and stoutest pinnule on the arm d1 the third-fifth segments of the genital pinnules more or less expanded laterally to protect the genital glands; a single median transverse ridge on the cirrus segments e1 Pp though longer and stouter than P3, not exceptionally so; median transverse ridge on the cirrus segments of moderate height Austrometra ') e2 Pj much stouter than P3, and so enlarged basally as to cause the second brachial to appear like an axillary ; median ridge on the cirrus segments very high Analcidometra d2 110 expansion of the genital pinnules; the cirrus segments bear two transverse ridges, a proximal and a distal Oligometrides P„ absent b1 more than 10 arms c1 Pj as long as, and similar to, P3 ; IIBr series commonly 4 (3 -|~4);_ outer cirrus segments with a low dorsal transverse ridge .... Petasometra c2 Pj shorter than P2 ; all the division series always 2 ; outer cirrus segments somewhat shorter than the proximal, bearing paired or tripled dorsal spines which on the terminal become resolved into a single median spine, or a median carination d1 Pj much smaller, weaker and more slender than the enlarged and stiffened P2 ; 10 — 30 arms; 21 — 30 cirrus segments; outer cirrus segments with paired or tripled dorsal spines, which become a single median spine terminally Cyllometra 1) Genotype Oligometra thttidis H. L. Clark, 1909; this genus is only known from southeastem Australia. I I 2 i' similar t<> 1\, but shorter; first three or four pinnul< edingly long, extremely slender, stiff, composed of greatly elongated seg- ments; aboul 40 arms: 37 39 cirrus segments of which the eighth is a well marked transition segment; the outer cirrus ;ments have .1 slightly produced distal edge and a median nation ; the opposin^ spine is doublé, forming two thick lobes, one on either side of the median line Epimetra arms e' th<- outer cirrus segments bear long and prominent dorsal spines, which may be single or paired, and are shorter than the proximal d1 more than 35 cirrus segments of which the outer are much shorter than the proximal, the latter being more or less elongated, and bearing paired dorsal spines; pinnules long and very stiff, the component segments with very spinous distal ends; proximal pin- nules elongated, with greatly elongated segments; distal edges of the longer cirrus segments fringed with spines Colobometra d less than 35 cirrus segments of which the outer are but slightly shorter than the proximal and bear single median dorsal spines ; pinnules short and somewhat stiffened, the component segments with spinous distal ends: proximal pinnules short, with short segments; distal edges of the cirrus segments smooth .... Cotylometra c- the outer cirrus segments bear a serrate transverse ridge dorsal ly, and are as long as, or slightly longer than, the proximal d1 P, resembling Ps, and of about the same length e1 25 or more cirrus segments, all of which are broader than long . the segments of the long and stiff P, and 1\ have smooth distal edges Petasometra e: 23 or fewer cirrus segments, the third-sixth and following about as long as broad; the segments of the long stiff lower pinnules have very spinous distal ends Prometra da P, shorter, more slender, and weaker than P., e1 most, <>r all, of the cirrus segments broader than long; 1' (and P if enlarged) distally usually more or less flagellate; no lateral processes and few or 110 spines on the edges of the segments of the lower pinnules Decametra all hut the basal cirrus segments about as long as broad; enlarged proximal pinnules commonly spine-like, without a llagellate tip, the distal edges of the segments hearing lateral processes or long spin f1 enlarged lower pinnules with elongated segments which have very spinous distal ends Prometra H3 P enlarged lower pinnules with comparatively short segments vvhich have broad longitudinal flange-like processes on the outer part of the prismatic ridges Oligometra Petasometra A. H. Clark. A. H. Clark. Smithsonian Miscellaneous Collections, vol. 60, 191 2, Nn 10, p. 25. Die Fauna Südwest-Australiens, vol. 4, 1913, Lief. 6, p. 311. Key to the Species of the Genus Petasometra. a1 10 — 14 arms; 20 — 29 (usually 20 — 25) cirrus segments (Flor es and Amboina . . clarae a3 over 20 arms; 28 — 31 cirrus segments (western Australia). . . . helianthoides 1. Petasometra clarae (Hartlaub). Hartlaub. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1891, Nu 1, p. 41, pi. 2, fig. 19 {Antedon clarae). Stat. 50. Bay of Badjo, west coast of Flores. 40 Metres. 3 Ex. Stat. 231. Amboina. 3 Ex. Of the three specimens from Stat. 50 one has 11 arms 85 mm. long; one IIBr 1 series is present, the IIBr axillary being supported equally by the IBr axillary and by the outer side of the IBrj-, another has 10 arms 85 mm. long and cirri 13 mm. long composed of 20 — 22 segments; the dorsal pole of the centrodorsal is circular, slightly concave, 2 mm. in diameter; the cirrus sockets are arranged in a single regular crowded row; the colour is dark brown, the cirri and centrodorsal light yellow brown ; the IBr series and first brachials are white ; there are one or two distinct white patches on individual arms; the third has 10 arms 85 mm. long; the cirri are VII, 19 — 20, 12 mm. long; the dorsal pole of the centrodorsal is slightly concave, circular, 2 mm. in diameter; the cirrus sockets are arranged in a single perfectly regular crowded row. These specimens differ from the large individual from Amboina in having slightly fewer cirrus segments, and in having P.. proportionately smaller; but both of these differences are directly correlated with the smaller size. One of the examples from Amboina has 10 arms 120 mm. long; the centrodorsal is discoidal, the dorsal pole large, circular, slightly concave, 2.6 mm. in diameter; the cirrus sockets are arranged in a single perfectly regular marginal row; the cirri are XIV, 26 — 29, 17 mm. long, rather stout; owing to the very crowded condition of the cirrus sockets, which are all in one regular row, the first segment of the cirri, as viewed dorsally, is very narrow ; from this segment the cirrus increases in diameter to the fourth, which is at least three times as wide as the first, and then tapers almost imperceptibly to the tip; all of the cirrus segments are approximately equal in length, short, about twice as broad as long; the lateral margins of the segments in the proximal half of the cirri are strongly bent, but those in the distal half are straight; beginning- on the second or third there is a straight serrate transverse ridge, at fc> 1 ö O ö O ' SIBO GA- EXPEDITIE XLIl£. 15 1 1 1 first terminal, but becoming median on about the fifth er sixth; on the antepenultimate segment tliis becomes ;i single small median spine; the opposing spine is long, median, erect, very much longer than the minute spine on the preceding segment, equal to about half the lateral diameter of the penultimate segment in height; the terminal claw is about half again as long as the preceding segment, stout in the basal third but becoming slender in the distal two-thirds, strongly curved basally bul becoming nearly straight distally; the dorsal surface of the cirri is broad arnl flat, rather abruptly separated from the lateral surface. rhe radials are almost entirely concealed by the centrodorsal; the IBrj is very short, three and one half times as broad as long. widely s< parated from its neighbours laterally: the [Br is broadly pentagonal, twice as broad as long; the synarthrial tubercles are moderately developed. The dorsal surface of the arms is almost smooth. 1' is absint: P, is 9 mm. long with 24 segments ut which the first is twice as broad as long and the following gradually increase in length becoming about as long as broad on the fourth and thereafter slightly longer than broad. 1\, is similar, but slightly longer and slightly stouter. 1' is similar, but somewhat smaller and shorter than Pv 7 mm. long with 16 segments; 1', is 4.5 mm. long with 15 segments of which the distal are elongate; the following pinnules are similar: the distal pinnules are very slender, 12 mm. long. The colour is yellow brown with purplish blotches on the arms; the outer half of the cirri is purplish. Another specimen has 14 arms 120 mm. long; all four of the IIBr series are 4(3 + 4); the cirri are XVI, 23 — 24 (usually 23), 15 mm. long; the dorsal pole of the centrodorsal is slighüy concave, 3 mm. in diameter. P, is S mm. long. P, is 9.5 mm. long with 22 segments. I' i> 6.5 mm. long. P4 and the following pinnules are 4.5 mm. long, very delicate; the large proximal pinnules are somewhat stiffened. The distal pinnules are o mm. long. The colour is the same as in the preceding. The third specimen is small; it has 10 arms 55 mm. long. Cyllometra A. H. Clark. I\'\ to the Species of the Genus Cyllometra. a1 The proximal cirru> segmi nts are longer than broad, and may be twice as long a^ broad or even longer cirri of moderate length and stoutness, the distal segments broadcr than g; the cirrus segments beyond the basal bear long and prominent dorsal spines which at first are simplj forked, then usually tridentate, later transforming into a high dorsal process with a straight edge parallel to the distal border of the .egment, which gradually becomes a simple high dorsal spine; 11 — 20 arms (Philippine Islands). . disciformis '•irri long and slender with the distal segments longer than broad and ring minute dorsal tubercles; usually 25- 30 arms Li er Sunda Islands) gracilis i'5 a2 The longest proximal cirrus segments are not longer than the diameter of their clistal ends b1 cirrus segments subequal, mostly about as long as broad, the outer with minute dorsal tubercles; 10 — 30 (usually 20) arms (southern Japan and the Liu Kiu Islands) albopurpurca b2 outer cirrus segments broader than long and bearing small, but pro- minent, dorsal spines c1 19 — 29 arms; IIIBr series present; outer edges of the segments of Pa with prominent spines at the prismatic angles (K i and LesserSunda Islands) manca c3 14 — 18 arms; no IIIBr series; outer edges of the segments of P„ with small spines at the prismatic angles (Persian Gul f) . . sohtta 1. Cyllometra gracilis A. H. Clark. A. H. Clark. Arm. and Mag. Nat. Hist., series 8, vol. 10, 19 12, p. 35. Stat. 49a. 8° 23.5 S., H9°4'.6E. Sapéh Strait. 69 Metres. 14 Ex. The centrodorsal is discoidal with a flat or slightly concave dorsal pole 2.0 mm. in diameter; the cirrus sockets are arranged in one and a partial' second marginal row. The cirri are XXIII, 25 — 30, 21 mm. long: the first segment is short, the second about twice as long (one third to one half again as broad as long), the third slightly longer than broad, the fourth slightly longer than the'third, the fifth nearly as long as the sixth; the sixth- ninth or -tenth are about twice as long as the proximal diameter; the following gradually decrease in length so that the last twelve before the penultimate are subequal, slightly longer than broad. The cirri as a whole are long and unusually slender; owing to the crowded condition of the cirri on the centrodorsal the first segment of each cirrus is sharply flattened laterally against those of the cirri on either side ; the distal dorsal edge of the fourth and following segments is slightly swollen, this after the seventh becoming a trio of dorsal spines, a central larger and two smaller lateral ; the central projects more dorsally than the other two, but does not extend so far distally ; all three are very small ; on the last twelve to fifteen segments before the penultimate the lateral spines disappear and the median becomes slightly more prominent, occurring as a single submedian tubercle, directed obliquely forward ; all the dorsal processes are small and inconspicuous. The radials project very slightly beyond the centrodorsal in the median line, but extend well up in the angles of the calyx entirely and widely separating the bases of the IBr^ the division series resemble those of the other species of the genus. In the larger specimens the arms are from 26 to 28 in number, and about 50 mm. long; the arrangement of the arms on the rays is 2, 1, 1, 2; IIIBr series appear always to be present, at least on a minority of the rays, and are always external. The long distal cirrus segments which bear dorsal processes so slight as scarcely to be noticeable indicate that this species is most closely related to the Japanese C. albopurpurea. i [6 2. Cy Home tra manca (P. 11. Carpenter P. II. CARPENTER. Buil. Mus. Comp. Zool., vol. 9, 1881, N" 4, p. 5 {Antedon sp.). ■Challenger" Reports. The Comatulae, [888, p. 226, pi. 44, ligs. 2, 3 [Antedon manen,. Stat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 1 Ex. 1'lu- dorsal pole of the centrodorsal is flat, 2 mm. in diameter. The cirri are XV, 31, about 15 mm. long; the fifth-seventh segments are about as long as their (listal diameter; the sixth and following have prominent paired dorsal spines which at first are widely separated luit distally approach «ach other and merge into a single spine on the last two segments before the penultimate. The ig arms are 60 mm. long, and are arranged on the five rays as follows: 3 Ü + 3)i 4(' + 3); 3 ' + 2); 6(2- '1 '1 2); 2; the IIIBr series are all external. 1', is 1 1 mm. long, and is composed of 16 segments. 3. Cyllometra disciforntis (P. H. Carpenter). As vet we are unable to state with certainty what really constitute the valid specific characters in the genus Cyllometra. The number of arms is subject to so much individual variation as to be of uncertain value, while the same is true of the length, number of component segments and character of the enlarged proximal pinnules. At present we are inclined to regard the cirri as offering the best criteria for specific differentiation, though they also are very variable. But C. albopurpurea and C. gracilis may be readily distinguished from all of the ether types by a glance at their cirri, and that is something gained. The cirri oi typical C. disciformis and typical C. manca are very different. In both the dorsal spines are well developed (as compared with C. albopurpurea and C. gracilis), but in t". disciformis they are much lon^er than in C. manca, while furthermore the earlier cirrus nents are elongated, twice as long as broad instead of only very slightly, if at all, longer than broad. However, in deep and cold water as a rule the elongated earlier cirrus segments of C. disciformis rapidly shorten, so that the character of the cirri approaches that of typical C. manca. I have before me 56 specimens which I have referred to C. disciformis. all from the Philippine Islands I 1 t of Masbate, 80 fathoms ("Albatross" Stat. 5213; Cat. X" 35314 U.S. Nat. Mus.); ;- Ex. < 't these the largest have arms 95 mm. long; ten have 11 arms, eight have 12 arms, six have 13 arms. tour have 14 arms, three have 15 arms, two have 16 arms, three have 17 arms. two have tg arms, and four have 20 arms; one is badly broken, and there are two ten-armed young. Easl of Masbate, 80 fathoms ("Albatross" Stat. 52 13; Cat. X" 36(137 U.S. Nat. Mus); 1 Ex. 1 a i of Masbate, 10S fathoms ("Albatross" Stat. 3212; Cat. X" 35348 U.S. Nat. Mus.); Ex. These have [6, |S and 20 arms. North Balabac Strait, 58 fathoms ("Albatross" Stat. 5356; Cat. X" 35280 U.S. Nat. Mus.); 1 1 ii7 North Balabac Strait, 58 fathoms (" Albatross" Stat. 5356; Cat. N° 35275 U.S. Nat. Mus.); 2 Ex. These have 15 and 21 arms. Verde Island Passage, 180 fathoms ("Albatross" Stat. 5367; Cat. N" 36224 U.S. Nat. Mus.); 1 Ex. Near Marinduque, 106 fathoms ("Albatross" Stat. 5369; Cat. Nü 35949 U.S. Nat. Mus.); 1 Ex. A typical example with 1 2 arms. Tawi Tawi group, 12 fathoms ("Albatross" Stat. 5154; Cat. N° 35270 U.S. Nat. Mus.); 1 Ex. There are 19 arms. Zebu reefs, littoral (from the "Challenger" collection; Cat. N° 17529 U.S. Nat. Mus.); 1 Ex. Decametra A. H. Clark. Key to the Species of the Genus Decametra. a1 The distal edges of the segments of the much enlarged and stiffened P2, which is from half again to twice as long as the approximately equal PT and P3 and is composed of 14 — 20 segments, bear groups of prominent spines at the prismatic angles; lower pinnules all stiffened; 16 — 20 cirrus segments; arms 50 mm. long (southern Japan) tigrina a2 The distal edges of the segments of P2 do not bear groups of prominent spines at the prismatic angles ; except for P3 and sometimes P., (more rarely Pj) the lower pinnules are not stiffened b1 P3 resembling P3 and longer than Pj ; P2 with 15 — 17 segments c1 20 — 23 cirrus segments; arms 65 mm. to 75 mm. long d1 cirri stouter, the majority of the segments being twice as broad as long or even somewhat broader (Philippine Islands) . . . . mylitta d2 cirri more slender, the majority of the segments being only slightly broader than long (K u r r a c h i , I n d i a) inollis c2 25 — 29 cirrus segments; arms 80 mm. to 1 10 mm. long d1 P„ is stout, less than half again as long as Px, and none of its comp- onent segments are longer than broad (sou th western Indian Ocean) alaudae d- P„ is rather slender, nearly or quite twice as long as Px, and most of its component segments are from half again to twice as long as broad e1 most of the segments of P, are from one third to one half again as long as broad, with prominent, though not spinous, distal ends (C e y 1 o n) taproöa?ies e2 most of the segments of P2 are twice as long as broad, with spinous distal angles (M uscat,Arabia) arabica b3 P„ shorter than Pl c1 P2 has 17 — 18 smooth segments which do not bear spines on their distal angles; arms 45 mm. to 50 mm. long I iS d' [8 2;, cirrus segments; P, with 14—15 segments, nearly ;is long as I' and of the same character; the segments ol P beyond the fifth are only slightly longer than broad; arms 50 mm. in length (Saleyer). laevipinna d9 16 — -18 cirrus segments; 1', slender, becoming flagellate distally, less stoul and stiff than 1'., with 16 segments; the segments of 1'. from the fourth onward are about half again as long as broad; arms 45 mm. long western Australia) ttuderi 1' has 10 — 14 segments which bear fine spines on the (listal angles d1 21 — 23 cirrus segments, most of which are about twice as broad as Ion-, the antepen ultima te being nearly or quite as long as broad; P, has 12 — 1 ; segments; arms about 35 mm. long (C e y 1 o n and vicinity) brevicirra ds not more than 20 cirrus segments e1 15 — 20 cirrus segments; P, has about 13 segments; arms 35 mm. to 50 mm long f1 all of the cirrus segments broader than long; outer segments of Ps less than twice as long as broad; 15 — 18 cirrus segments; arms 40 mm. long (Philippine Islands) informis {- outer cirrus segments about as long as broad; segments in the distal half of P., twice as long as broad; 14 — 20 cirrus segments; arms 35 mm. to 50 mm. long (sou the as ter n Africa and Mauritius) modica l) 10 — 15 cirrus segments, those beyond the fifth-seventh about as long as broad; P2 has 8 — 1 1 segments; arms 35 mm. to 40 mm. long f1 14 — 15 cirrus segments; P3 has 11 segments (Paternoster Islands) paria f- io — 12 cirrus segments; P„ has 8 — 9 segments (Celebes). . minima 1. Decametra mylitia A. H. Clark. A. H. CLARK. Ann. and Mag. Nat. Hist., series ï>, vol. 10, 1912, p. 36. Stat. 99. 6V.5N., [20°26 E. Anchorage of North-Ubian Island. 16—23 Metres. 4 Ex. The centrodorsal is discoidal, the Hat dorsal pole 1.5 mm. in diameter; the cirrus sockets are arranged in two closely crowded alternating rows. The cirri are XIX, 21 — 23, 10 mm. to 11 mm. long; the cirrus segments are subequal in length. the tirst very short, the second slightly longer, the third and following about twice as broad as long or slightly broader, the lasl three before the penultimate increasing slightly in length so that the antepenultimate is about one third again as broad as long; the earlier segments have the dorsal surfaqe swollen and truncated distally so that the dorsal profile is \ il- lig serrate; after the first three the dorsal profile of the individual segments becomes straighter, making a considerable angle with the longitudinal axis of the cirrus, and the distal edge becomes straight, forming a very finely spinous transverse ridge which, however, is not raised above the general dorsal surface of the segments; this transverse ridge becomes gradually more and more marked, at the same time moving more and more toward the centre of the dorsal surface ; at the ninth segment it becomes median and begins to become slightly concave in profile, and after the fourteenth it resolves itself into two prominent entirely distinct tubercles situated side by side, the distance between the apices of these tubercles being about equal to the distance from either apex to the lateral border of the segment; distally these tubercles gradually move toward each other, at the same time moving nearer and nearer the proximal margin of the segments; on the fourth before the penultimate the tubercles merge into a single transversely elongate tubercle which becomes less and less elongate and on the antepenultimate becomes a single small tubercle situated near the proximal margin of the segment. As a whole the cirri are moderately stout; in lateral view, though the dorsal profile is serrate, no distinct dorsal processes are seen except in the distal half when the tubercles appear as minute dorsal processes. The arms are 10 in number, 75 mm long, and resemble those of the other large species of the genus. Pt is 5 mm. long, small and weak, with 14 segments, tapering with moderate rapidity in the proximal half and becoming very slender in the distal half; the first segment is short, the following gradually increasing in length and becoming about as long as broad on the fourth and fifth and distally about twice as long as broad ; the pinnule is slightly prismatic. P2 is 9 mm. long with 17 segments, not greatly larger than Pj basally but tapering evenly from the base to the tip; the first two segments are slightly broader than those following, much broader than long, the third slightly broader than long, the fourth slightly longer than broad, and the following about half again as long as broad, becoming twice as long as broad toward the end of the pinnule; the pinnule is rounded prismatic; the fourth and following segments have slightly produced and spinous distal edges, this feature gradually increasing in extent distally and being most marked at the prismatic angles. P3 is 6 mm. long with 14 segments, similar to P2 but very slightly smaller; P4 is 5 mm. long with 13 segments, similar to P3 but slightly smaller. P. is 4.5 mm. long with 14 segments, resembling P4 but with proportionately shorter segments. P6 is 4 mm. long with 15 segments, resembling P. but with proportionately shorter segments; the following pinnules are similar to Pc. The distal pinnules are very slender, 7 mm. long with 21 segments of which the longest are about twice as long as broad. The colour is light yellowish, banded with purple at the brachial articulations. Another specimen has the arms 75 mm. long and the cirri XIV, 23 — 25, 11 mm. long; as in the preceding the first cirrus segment is strongly compressed laterally through crowding by its fellows; Pl is 6 mm. long with 15 segments; P2 is 9 mm. long with 17 segments; Ps is 6.5 mm. long with 14 segments; P4 is 5 mm. long with 12 segments; P. is 4.5 mm. long with 1 3 segments. The remaining two specimens are similar. I 20 This species is most closely related to />. mollis trom Kurrachi from which it differs in having the cirri slightly stouter witli most of the segments twice as bruad as long or «ven somewhat broader instead ol only slightly broader than long as in D. mollis; in having the proxiraal pinnules, while ol about the same proportions as those of D. mollis, relatively longer and stouter and composed of somewhat shorter segments; and in having the synarthrial tubercles »s marked. A specimen before me which I refer to D. mylitta, dredged near Jolo, Philippine Islands, in 20 fathoms "Albatross" Stat. 5139; Cat. X" 35338, U.S. Nat. Mus.), with an arm length of 57 mm., agrees with one of those above described in having the cirrus segments somewhat longer than usual, and more like those of D. mollis. It is possible that D. mylitta is only a variety of D. mollis, and it may be that in reality they are identical. 2. Decametra laevipinna (A. H. Clark). A. II. Cl. ark. Ann. and May. Nat. Hist, series 8, vol. 10, 1912, p. $j [Promelra laevipinna). :. 213. Saleyer. Keef. 1 Ex. The centrodorsal is discoidal with a broad flat circular dorsal pole 2 mm. in diameter: the cirrus sockets are arranged in a single closely crowded marginal row. The cirri are XIV, 18 — 23, 13 mm. long; the first segment is very short and the following gradually increase in length, after the tenth or eleventh being about as long as broad; the first segment has the distal dorsal edge produced; on the second and third this becomes a strong transverse ridge which gradually moves anteriorly, becoming median on the eighth and following, and appearing as a minute median spine in lateral view; this ridge shows no tendency to resolve itself into paired spines or tubercles, nor does it narrow appreciably on the outer segments, occirrring as a broad transverse ridge even on the antepenultimate ; the opposing spine is small, slender, median, erect, about equal to one fourth of the lateral diameter of the penultimate segment in height. The arms resemble those of the other species of the genus, and are about 50 mm. long. P, is 5.5 mm. long. moderately slender, somewhat stiffened, with 14 — 15 segments of which the first is short, the following gradually increasing in length and becoming about as long as broad on the tifth, and on the outer very slightly longer than broad; from the third segment ontward the pinnule is rather strongly prismatic with a prominent rounded ridge running along the centp' oi the outer surface. P3 is 6.5 mm. long with 17 segments, resembling P, but slightly more slender ba ally and tapering more evenly to the tip, and not so strongly prismatic; the outer edges of the segments of both these pinnules are perfectly smooth. 1' is 4.5 mm. long with 14 segments, similar to 1', but proportionately smaller and more slender distally. 1', is 3.5 mm. long with [3 segments, small and slender. P, is similar, 3.0 mm. long with 11 segments. IV is similar to I', 3.0 mm. long with 12 segments. The distal pinnules very slender, 7.0 mm. long with 20 — 22 segments. I 2 I 3- Decametra parva (A. H. Clark). A. H. Clark. Ann. and Mag. Nat. Hist., series 8, vol. io, 1912, p. 39 {Prometra parva). Stat. 260. 50 36.5 S., I32°55'.2E. 90 Metres. 1 Ex. Stat. 315. Anchorage east of Sailus Besar, Paternoster Islands. Up to 36 fathoms. 2 Ex. The cirri are XIV, 14 — 15, 5.5 mm. long, and resemble those of D. minima-, the sixth or seventh and following segments are about as long as broad. The ten arms are 40 mm. long; the lower discoidal brachials are smooth, but those following have rather strongly everted dtstal ends. Pj is 2.3 mm. long with 11 segments; it tapers rather rapidly in the first four segments, more gradually from that point onward; the first segment is short, the second slightly longer, the third slightly broader than long, the fourth slightly longer than broad, the fifth and following about twice as long as broad; P2 is from 3.5 mm. to 4.5 mm. long with 11 segments, evenly tapering, much larger and stouter than the other pinnules, though not greatly enlarged ; the first segment is short, the second half again as broad as long, the third slightly broader than long, the following gradually increasing to the seventh which, with the following, is twice as long as broad ; the pinnule is rather strongly prismatic, and the fourth and following segments have their distal edges produced at the prismatic angles into prominent short stout spines which increase in prominence distally. P3 is 1.5 mm. long, small and weak, with eight segments of whieh the distal are elongated. P4 is slightly smaller than P3. The distal pinnules are exceedingly slender, 4.0 mm. to 4.5 mm. long with 13 segments of which the second and third are slightly carinate and the outer are greatly elongated. The second specimen from Stat. 315 has the arms 35 mm. long and the cirri VII, 14 — 15, 5.5 long; P2 is not quite so much enlarged as in the one described. In addition to the three noticed above I have before me two specimens of this species from near Joló, Philippine Islands, in 13 fathoms (" Albatross" Stat. 5557; Cat. N° 36022 U. S. Nat. Mus.). 4. Decametra minima (A. H. Clark). A. H. Clark. Ann. and Mag. Nat. Hist., series 8, vol. 10, 1912, p. 38 [Prometra minima). Stat. 79a. 2°38'.5S., H7°46'E. (Borneo Bank). 54 Metres. 1 Ex. Stat. 117. i°o'.5 N., 122° 56' E. (Kwandang Bay entrance). 80 Metres. 24 Ex. Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 1 Ex. Stat. 260. 5°36'.5S., i32°55'.2E. Near Kei Islands. 90 Metres. 1 Ex. The centrodorsal is thin discoidal, the dorsal pole flat, finely papillose, 1 mm. in diameter. The cirri are X (rarely any other number), 10 — 12, 3 mm. to 4 mm. long; the first segment is short, the following increasing1 in length to the fifth or sixth which, with the following-, is about as long as broad ; the second and following bear a finely serrate transverse ridge which becomes median in position after the fourth or fifth ; it is low and very narrow, appearing as SIBOGA-EXPEP1ÏIE XLII^. IÓ ery minute sharp spint- in lateral view; l the cirrus segments as seen dorsally, hut from that point onward it becomes narrower, beyond the sixth dividing more or less completely into two transversely oblong sharp ridges or smal! sharp spines ; the antepenultimate segment bears a single spint- . the opposing spine is much larger than the spine on the preceding segment. The radials are just visible beyond the centrodorsal ; the IBr, are very short, aboul four times as broad as long, with the proximal and distal edges straight and parallel, and the .1 edges ging slightly; there are slight rounded ventrolateral projections; the axillaries are broadly pentagonal, half again as broad as long; synarthrial tubercles are moderately d; like the IBr, the axillaries and first brachials have slight rounded ventrolateral proce I he arms resemble those of the other species of the genus; on the lower oblong brachials there is a faintly indicated rounded median carination. The arms are 35 mm. to mm. long, and very slender. In some specimens the ventrolateral processes on the ossick-s of the IBr series and the fust brachials are produced into a rounded triangular flange, of which the axillary has two, a proximal and a distal. P, is 2 mm. long vvith 8 or 9 segments, nearly as stout basally as P3, but tapering more rapidly and becoming slender and delicate distally; the first segment is short, the following gradually increasing in length and becoming slightly longer than broad on the third and about twice as long as broad distally ; the distal edges of the outer segments are slightly spinous. 1' is 3 mm. long, stift" and spine-like, though slender, tapering slowly from the base to the tip. composed of 8 or 9 segments of which the first is twice as broad as long, the second is nearly as long as broad, and the third is nearly twice as long as broad; the remainder are about three times as long as broad-, the third and following bear long and prominent spines on the prismatic angles ; the pinnule is rather strongly prismatic. Ps is 2 mm. long, small and slender, slightly stiffened. composed of 8 segments which become elongate distally. P4 is 125 mm. long, very delicate and not stiffened, composed of 9 segments which becomè much elongate distally. P, is similar to P4, but slightly shorter, The distal pinnules are 2.5 mm. long, exceedingly slender and delicate, composed of 1 3 segments of which the second and third are strongly carinate and the outer are very greatly elongated. Some specimens show a much greater development than others of the spines on the ments of the lower pinnules. The disk is thickly sprinkled, or almost covered, with small rounded plates. The specimen from Stat. 79-' has the arms about 15 mm. long, and 11 — 12 cirrus segments; that from Stat. 144 has arms about 20 mm. long: that from Stat. 260 has arms mm. long. and cirri with 1 1 segments. In addition to those mentioned above 1 have before me a specimen from the Gulf of Davao, Philippine Islands, dredged in 18 fathoms ("Albatross" Stat. 5248; Cat. X" 36038 5. Nat Mu 5. Decametra informis (P. H. Carpenter). P. H. Carpenter. aChallenger" Reports. The Comatulae, 1888, p. 205, pi. 33, fig. 3 {Antedon informis). I have at hand a specimen of this species from the Gulf of Davao, Philippine Islands, v dredged in 23 fathoms (" Albatross" Stat. 5249; Cat. N° 35282 U.S. Nat. Mus.). Colobometra A. H. Clark. Key to the Species of the Genus Colobometra. a1 Cirri very long with about 60 (53 — 65) segments of which the longest are one third again as long as broad ; P3 slightly larger than P2 ; following pin- nules to PB or P8 similar, slightly decreasing in length (M oluccas and New Guinea to New South Wales and Lord Ho we Island) . . . perspinosa a) a2 Cirri shorter, with not more than 5 2 segments ; P., not longer than P, b1 44 — 52 cirrus segments,' none of which are as long as broad; P:i similar to P„ and of the same length; P.t similar, but shorter; Pj not greatly stiffened, composed of segments which become twice as long as broad on the sixth and following (M oluccas to Singapore) vepretuiit b2 not more than 40 (29 — 40) cirrus segments, of which the longest are longer than broad c1 P3 markedly longer and stouter than the succeeding pinnules; P3 similar to P„ but shorter and more slender; 29 — 40 (usually about 35) cirrus segments of which the tw'o or three before the penultimate bear single median dorsal spines (Ceylon and the Bay of Bengal to the Lesser Sunda Islands, Borneo and the Philippine s) discolor ca P„ to P. or P7 approximately equal in length and stoutness d1 Pj resembles P3 and is stiff and spine-like with 10 segments of which the fourth and following are about four times as long- as broad; only the antepenultimate cirrus segment bears a single median dorsal spine ; P3 to P:> similar and of approxim- ately equal length (Solomon Islands). . ." . . . . diadema d3 Pj is much less stiff than Pc, and is composed of 2 1 segments none of which are more than very slightly longer than broad ; the 18 — -22 segments before the penultimate bear single median dorsal spines; P2 to P7 approximately equal in length and similar, with a very slight development of spines on the distal borders of the component segments (Philippine Islands) suavis 1) Synonyms Antedon insignis Bell. and Antedon /oven! Bell, 18S4 (not Antedon lovéni Bell, 1882 = Antedon pumila Bell, 1SS4). i. Colobometra p$rspinosa . I' II Carpenti 1'. II. CARPENTER. Notes from the Leyden Museum, vol. 3, issi, p. 178 [Antedon perspinosa). Bell, Proc. Zool. Soc. London, 1882, |>. 534 [Antedon insignis). ■Alert" Report, 1884, i>. 15$ [Antedon lovini). HARTLAUB. Nova A.cta der Ksl. Leop.-Carol. Akad. der deutschen Naturforsch., vol. 58. 1. \ 1. |. 85 reference to the Leyden specimen and to Antedon lovini only). A. II. ClaRK. Notes from the Leyden Museum, vol. 33, 1911, p. 188. Recent Crinoids of Australia, 1911, p. 771. Crinoid- of the Indi.in Ocean, 1912, p. 164. Smithsonian Miscellaneous Collections, vol. 6\, 1913, ><"' 15, p. 37. Stat. 40. Anchorage off Pulu Kawassang, Paternoster Islands. 12 Metres. 1 Ex. Stat. 14*1. West coast of Gebé Island ; Fau anchorage and lagoon. 31 Metres. 1 fragment. Stat. 240. Banda. 9 — 36 Metres. 1 Ex. ( >n the specimen from Stat. 40 only a single undeveloped cirrus with 49 segments remains. The individual from Banda has arms 130111111. long, and cirri X (with some rudimentary)' 56 — 63, 45 mm. to 50 mm. long. The colour is black, tinged with violet. 2. Colobometra discolor A. H. Clark. A. H. CLARK. Proc. U.S. Nat. Mus., vol. 36, 1909, p. 640. Proc. U.S. Xat. Mus., vol. 39, 191 1, p. 543. Crinoids of the Indian Ocean, 1912, p. 166, fig. 25, p. 167. Stat. 80. 2°25'S., H7°43'K. Borneo Bank. 40—50 Metres. 4 Ex. Stat. 310. 8°3o'S., 119V.5E. 73 Metres. 1 Ex. The largest specimen from Stat. 80 has the cirri XV, 36 — 39, iS mm. to 21 mm. long; the cirri are slightly more slender than in the type series, with the long proximal segments slightly more elongate; the dorsal pole of the centrodorsal is papillose; Pj is 5.5 mm. long with 13 segments; 1\ is 9.5 mm. long with 14 segments; I' is 8.5 mm. long with 14 segments, similar to I' . 1' is 6.5 mm. long with ii segments, similar to P3; P8 is 7 mm. long. The elongated proximal pinnules are relatively ^horter and more recumbent than in the typical form. < )f the other specimens two have arms 40 mm. and 45 mm. long respectively ; the third has arms 15 mm. long and cirri IX, 12, 3 mm. long, resembling the cirri of the species of /'roiuttra, the segmen tly about as long as broad. On most of the arms Pa and \\ have not as yet appeai The example from Stat. 310 has the cirri with 39 — 48 segments (one of each), 25111111. to 35 mm. long; the longest cirrus segments are slightly longer than broad; Pï is 8 mm. long with 19 segments; 1', is 12.5 mm. long with iS segments; 1' is 10.5 mm. long with 14 — 17 segments; P, is 9 mm. long with 15 segments; the lower pinnules are rather less stiffened than usual in this species, and are slightly recurved ; the spines on the distal ends of the pinnule segments are shorter and less prominent than is commonly the case; there are no synarthrial tubercles. The size is the same as that of Ipecimens of this species at hand from tin- Andaman Islands. 125 Prometra A. H. Clark. Key to the Species of the Genus Prometra. a1 The first three pinnules are of the same length and character, but P4 and the following pinnules are much shorter b1 16 — 21 (usually 18 — 19), cirrus segments; Px — Ps with 14—16 segments; arm length 55 mm. to 60 mm. (southern Ja'pan) owstoni b2 14 — 15 cirrus segments; Px— P:; with 11 — 12 segments; arm length about 30 mm. (Philippinelslands) longipinna a2 The first three pinnules are not of the same length b1 P2 greatly elongated, becoming very slender and almost flagellate distally, nearly twice as long as Pl and P3, which are of the same length, com- posed of 21 segments; arm length 90 mm.; cirri with 22 — 24 segments (Red Se a) chadzvicki b2 Pj is longer than P2, which otherwise exactly resembles it; both are composed of 8 segments; arm length 18 mm.; cirri with 10 — 11 segments (Andaman Islands) intermcdia x) 1. Prometra longipinna sp. nov. This species closely resembles P. oivstoni; it may be briefiy diagnosed as follows: The cirri have 14 — 15 segments of which the fourth and following are about as long as broad; the cirrus length is about 4 mm. The arms are about 30 mm. long, resembling those of P. owstoni, Pj is 5 mm. long, stiff and spine-like, composed of 11 — 12 segments of which the first is broader than long, the second one third again as long as broad, and the fourth and following two and one half to three times as long as broad ; the terminal three or four have prominently spinous distal ends. P3 is 5 mm. long with 11 — 12 segments, exactly resembling Pr P3 is 5 mm. long with 1 1 segments of which the outer are slightly more elongate than those of the preceding pinnules, and the fourth and following have everted and spinous distal ends. Pt and the following pinnules are 3.5 mm. long with 10 segments, smaller and weaker than the preceding pinnules, though the component segments are of about the same proportions; the fourth and following have everted and spinous distal ends. The distal pinnules are 4.5 mm. long with 14 segments of which the third and following have slightly produced and finely spinous distal ends. The single specimen at hand was dredged in North Balabac Strait, Philippine Islands, in 58 fathoms ("Albatross" Stat. 5356; Cat. N° 35366 U.S. Nat. Mus.). No species of this genus was secured by the "Siboga", but it is desirable here to include a notice of it as it is one of the characteristic genera of the Indo-Pacific fauna. 1) Oligometra inttrmedia A. H. Clark, 1912. [26 Oligometrides A. il l '.ark. i Oligometrides adeonat (Lamarck) Lamarck. Hist. n.it. des animaux s.ms vertèbres, vol. 2, [8i6, i>. 535 [Comatula adeonae). BELL. "Alert" RciM.it. [884, p. 156 [Antedon adeonae and A. pinniformis); p. 158, pi. ir, \.i — <■ (Antedon bidens). DöDERLEIN. Denkschr. der medicin.-naturwiss. Gesellsch. Jena, vol. 8, 1898, p. 476, pi. 36, ii;4>. 3 — 3.,. N 11 12, p. 368 (Oligometra bidens). Buil. du Mus. d'hist. nat., Paris, 1911, X" 4, p. 255 (Oligometra adeonae). ■ The Recent Crinoids of Australia, iyu, p. jjC> (Oligometra init'). Crinoids of the Indian Ocean, 191 2, p. 175 (Oligometra adeonae). — — Ann. and Mag. Nat. I list., series S, vol. io, 1912, p. 40 (Oligometra tnarginata). R.EH HENSPERGER. Abhandl. der Senck. Xaturforsch. Ges., vol. 35, 1913, part 1, p. 105 [Oligo- metra adeonae). A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1913, X" 15, p. t,j. II. I.. CLARK. Carnegie Institution of Washington 1'ublication X"2I2, 1915, p. 105 (Oligo- metra anisa). Stat. 2JI. Anchorage off Pulu Jedan, east coast of the Aru Islands (Pearl Banks). 13 Mctres. 8 Ex. Mat. 305. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metres. 1 Ex. The most perfect specimen from Stat. 273 may be described as follows : I he centrodorsal is small, discoidal, the dorsal pole papillose, 1.5 mm. to 2.0 mm. in diameter; the cirrus sockets are arranged in one and a partial second marginal rows. The cirri are XVI, 20, about 10 mm. long; the cirrus segments are, trom the third, fourth or htth onward, about as long as broad; on the fourth or fifth and following two trans- verse ridges, a proximal and a distal, are developed, which in a lateral view appear as two small dorsal spines. a cirrus from a >pecimen of oiigenutriJcs The 10 arms are about 50 mm. long ; the ossicles of adcomit from Stat. 273 viewed (a) dorsally . . . and (#) laterally, x 5- (Courtcsy of the u.s. the IBr series and the hrst two brachials are broad, and are National Museum jn ciose iateral apposition all along their edges. The IBr series and arm bases of this species are most strikingly similar to those of the species of Tropiometra. I', is the longest and stóutest pinnule, 8 mm. long with 13 segments of which the first is slightly broader than long, the second is trapezoidal, tapering distally, slightly longer than the proximal (greater) width, the third is about twice as long as the proximal width, the fourth and fifth about three times as long as broad, and the remainder from two to two and one half times as long as broad; the pinnule tapers evenly from the base to the tip, and is distinctly prismatic, with the dorsal ridge rounded, tor its whole length; P, is 6.5 mm. long with 12 segments, similar to 1', but proportionately less stout: P is £.5 mm. long with 10 segments, similar to I se three pinnules are consideraMy stiffened. P, is 4 mm. long with 12 seg- ments of which the tirst is over twice as broad as long and the following gradually increase in length becoming about as long as broad on the fourth and twice as long as broad distally; pinnule is slightly less stout basally than P and tapers more rapidly; it is weak and not the following pinnules have more numerous and shorter segments. P,0 is 4.5 mm. 1 27 long with 1 7 segments which at first are short, becoming about as long as broad on the ninth or tenth. The distal pinnules are very slender, about 4.5 mm. long with 17 segments. The colour is violet as far as about the sixth brachial, thence yellow with a narrow median line of white; the outer half or two thirds of the proximal pinnules is yellow. An individual similar to the preceding, with arms 50 mm. and cirri 1 1 mm: long, is olive brown, gradually becoming yellow bfown after the second syzygy, there is a narrow median line of white on the arm bases as far as the second syzygy. Another is entirely deep violet with the ends of the cirri and pinnules yellowish. A fourth example is deep purple with narrow yellow bands on the arms and a more or less obsolete narrow mediodorsal line of yellow on the arm bases. A fifth is purple with large white blotches on the arms and a fine white mediodorsal line. Still another is entirely orange yellow. The remaining two resemble one or other of the preceding. The specimen from Stat. 305 I at first believed was a new species, and I therefore described it under the name of marginata ; further study has convinced me that it is merely a young specimen of adconae. lts characters are as follows : The dorsal pole of the centrodorsal is papillose. The cirri are XV, 15 — 16, 7 mm. long; the first segment is short, the following gradually increasing in length to the fourth, fifth or sixth which, with the following is about as lons: as broad. The cirri are moderately stout; the third and following segments have a strong trans- verse ridge near the proximal dorsal margin ; this ridge is prominent and high, with a finely serrate crest; it lies about one third of the distance between the proximal and distal margins of the segments; in the proximal half or three quarters of the cirri the distal dorsal edge of the segments is more or less everted so that there is the same bidentate appearance as in typical examples of adeonae\ on the earlier segments this eversion may be nearly as high as the transverse ridge, but it soon decreases in height and disappears in the outer half or quarter of the cirri; the segments of the smaller cirri are quite without it. The proximal arm structure resembles that in typical examples of adeonae; the ossicles of the IBr series and the first two brachials are broad, and are in lateral contact through produced and flange-like ventrolateral borders the outer edges of which are parallel to the longitudinal axis of the segments which bear them. The arms are 30 mm. long. PT is 5.0 mm. long- vvith 9 segments of which the first is about one third broader than long, the second slightly trapezoidal, half again as long as the proximal diameter, the third about three times as long as the proximal diameter,' the fourth-sixth slightly longer, and the following rapidly diminishing in length to the small terminal segments; the pinnule is rather slender, but much stiffened; the second-fourth segments are slightly constricted centrally. P2 is 4 mm. long with 9 segments, similar to P1 but very slightly stouter and with the component segments slightly shorter. P., is 2.5 mm. to 3.0 mm. long with 8 segments, more slender and less stiffened than the preceding. P4 is 2 mm. long, small, slender and weak, with 8 or 9 segments; the next two pinnules are similar, and the following gradually become elongated, 128 reaching 4.5 mm. or 5.0 mm. distally with 13 segments of which the majority are between two and three times as long as broad. ITie colour, as preserved, is white. Cotylometra A. II. Clark. Key to the Species of the Genus Cotylometra. a' The ossicles of the IBr series and the brachials in the proximal third of the arm each bear a narrow rounded median keel which on the first brachial may s be reduced to a prominent tubercle; the outer edges of the ossicles of the division series and the first two brachials are bordered with a row of thickly set tubercles or small spines (Philip pi ne Islands) ornata No keel on the IBr series and arms; edges of the ossicles of the IBr series and first two brachials unmodified (Andaman to the Lesser Sun da and Philippine Islands) gracilicirra 1. Cotylometra gracilicirra (A. H. Clark). A. II. CLARK. Smithsonian Miscellaneous Collections, vol. 52, 1908, part 2, p. 221 (Oligometra gracilicirra). Crinoids of the Indian Occan, 191 2, p. 168, fig. 26, p. 169 {Oligometra gracilicirra). Stat. 260. 50 36.5 S., 132°55'.2P2. Near Kei Islands. 90 Metres. 2 Ex. Stat. 305. Mid-channcl in Solor Strait, off Kampong Menanga. 113 Metres. 2 Ex. The examples from Stat. 260 are both small, with an arm length of 40 mm.; in one the cirri have 31 — 36 segments, and P, has 12 — 13 (usually the latter) segments; Pa is absent from all the arms; in the other 1'.. is present. < >ne of the specimens from Stat. 305 has the arms 80 mm. long and the cirri IX (with a few undeveloped), 28 — 31, 15 mm. long; P., has 10 segments. The other has arms 85 mm. long. P„ is absent. These specimens agree perfectly with the type, even in the details of the colouration; they are, however, slightly larger. Oligometra A. 11. Clark. Key to the Species of the Genus Oligometra. a1 The distal edges of the brachials in the proximal third <>f tin- arm are prominently everted b' the distal edges of the brachials in the proximal third of the arm are turned abruptly ontward and greatly produced ; their crest is scalloped and irregular; proximal to the second syzygy this eversion becomes nstricted to the central portion of the distal edge <»l the ossicles, and may be more or less resolved into high tubercles or blunt spines; the synarthrial tubercles are strongly i 29 produced and usually bear prominent tubercles or blunt spines; the anterior angle of the axillary is usually produced dorsalward, or bears three prom- inent tubercles ; the lateral processes on the segments of P3 are very high and broad, usually with a truncated distal angle; Px, though much smaller than P.„ bears similar lateral processes on its segments (northeastern C e y 1 o n) erinacea b" no modification of the edges of the ossicles of the IBr series or of the first few brachials; ossicles of P2 with very slight, those of P: with no, lateral processes (PTranquebar, India) imbricata a" the distal edges of the brachials in the proximal third of the arm are not everted b1 Pa very stout, composed of very short segments of which not more than three or four of the terminal are longer than broad, bearing very long lateral processes; these lateral processes along the outer ridge of the pinnule are uniform in character, narrowly triangular with a blunt apex, separated from each other by spaces of approximately their own size and shape, in the outer half of the pinnule being more than half the diameter of the segments which bear them in height ; along the distal ridge the lateral processes on the first four or five segments are high keels with the crest parallel to the longitudinal axis of the pinnule, beyond that point resembling the processes of the outer crest ; though much smaller and weaker, Pl more or less resembles P2, and P3, though also smaller, may resemble P., (northe r n Australia and the Aru Islands) carpenteri b3 P„, though markedly longer and stouter than P1 or Pg, is much less enlarged, the segments beyond the third being as long as, or longer than, broad c1 the segments of the enlarged lower pinnules bear lateral processes con- sisting of a rounded-triangular fin-like production of the prismatic ridges near the distal ends d1 the lateral processes on the segments of the proximal pinnules are extravagantly developed (R e d S e a) electrae d: the lateral processes on the segments of the proximal pinnules are not extravagantly developed e1 the lateral processes on the segments of the proximal pinnules are moderately developed (Ceylon, and eastward to the Malay Archipelago, New Guinea and the Philip pi nes) . . serripinnav) e3 the lateral processes on the segments of the proximal pinnules are greatly reduced, almost obsolete, usually bearing a tuft of small spines f1 proximal pinnules not carinate; i 7 — 22 (usually 19 — 20) cirrus seg- ments (sou theas tern Africa and Cargados Carajos) occidentalis 1) Synonyms pulchella and concinna A. II. Clark. SinOG^-EXTEDlTIE XIII'. ' 17 1 jo i second-fourth segment of proximal pinnules carinate; 23 — 24 cirrus segments (Fuchow, China) chinensis i ■ the segments of the enlarged proximal pinnules are unmodified, or have the (.listal edges slightly produced and spinous il' I', with 12 smooth segments; 1' about ;(s long as 1'., and similar to it; cirri arranged in two rows on the centrodorsal (southern Japan), jap'onica 1' with 15—23 segments, which are smooth, or have slightly spinous distal ends; 1' shorter than 1', (and P9); cirri arranged in a single ruw- en the centrodorsal (New Caledonia and the Tonga lslands) caledoniae \. Oligometra carpenteri (Bell) BELL. "Alert" Report, 1S84, p. 156 {Antidon milberti, part); p. 157 {Antedon carpenteri). 1'roc. Zool. Soc. Loiulon, 1894, p. 394 (Antedon milberti, part; Antedon serripinna). A. II. CLARK. Recent Crinoids of Australia, 1911, p. 775. Die Fauna Südwest-Australians, vol. 3, 191 1, part 13, p. 441, 443, 444, 446. Crinoids ot" the Indian ücean, 1912, p. 174. Smithsonian Miscell.ineous Collections, vol. 61, 19 1 3, N° 15, p t,J. Stat. 2j$. Anchorage off Pulu Jedan, eastern coast of the Aru lslands (Pearl Banks). 13 Metres. 4 Ex. Stat. 274. 5°28'.2S., t34°53'.9E. Near Jedan lslands, eastern coast of Aru lslands. 57 Metres. 2 Ex. All of these specimens are similar. with arms about 50 mm. long. 2. Oligometra serripinna (V . 11. Carpenter). 1'. H. CARPENTER. Notes from the Leyden Museum, vol. 3, 1881, p. 182 (Antedon serripinna). Hak 11. alt.. Nova Acta der Ksl. Leop.-Carol. deutschen Akad. der Xaturforsch., vol. 58, 1891, X' 1, ]>. 82. pi. 5, fig. 48 (the specimens described represent 0. caledoniae). Bell. Proc. Zonl. Soc. London, 1894, p. 396 [Antedon carinatd). A. H. CLARK. Proc. Biol. Soc. Washington, vol. 21, 1908, p. 226 (Oligometra pulchella). Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 222 (Oligometra pulchella). Proc. U. S. National Museum, vol. 36, 1909, p. 399 (Oligometra pulchella). Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 179. Proc. U. S. Nat. Mus., vol. 40, 1911, p. 33 (under Oligometra serripinna var. occidentalis). Notes from the Leyden Museum, vol. 33, IQII, p. 189. Crinoids of the Indian Ocean, 1912, pp. 169 — 174, fig. 28, p. 171. — Records of the Indian Museum, vol. 7, 191 2, part 3, N" 26, p. 270. Smithsonian Mi is Collections, vol. 60, 1912, N" 10, p. 27. Proc. Biol. Soc. Washington, vol. 26, 1913, p. 182. R.EICH1 1:1; Abhandl. der Senck. naturforsch. Ges., vol. 35, 1913, Heft 1, p. 105. A. II. ( LARK. Smithsonian Miscellaneous Collections. vol. 6r, 1913, X" 15, p. 38. Stat. 164. i°42.;S.. 1 30° 47 .5 1-'.. Between New Guinea and Misool. },2 Metres. 1 Ex. 1. 258. Tual Anchorage, Kei lslands. 22 Metres. 1 Ex. From Stat. 164 there is o: imen with arms 50 mm. long; I', is greatly enlarged with strongly markcd processes; 1' is small, like I' . I u The specimen from Stat. 258 has rather slender cirri with 16 — 17 segments which beyond the eighth are about as long as broad. P3 is much enlarged, much larger than the other pinnules, composed of 17 segments most of which are about as long as broad, 7 mm. long; the lateral processes are small and narrovv (antero-distally) and are armed with. fine spines; the other proximal pinnules have the segments with spinous distal ends; Pa is absent on all the arms of three rays, six in all. This individual approaches the African occidentale. no VII. Family Tropiümetridae A. H. Clark. Tropiometra A. H. Clark. Key to the Species of the Genus Tropiometra. a1 Size large; arms 170 mm. to 230 mm. (usually over 200 mm.) long: carinate processes on the brachials b1 cirri large and massive, 40 mm. to 50 mm. long, with usually 35 — 40 segments (southernjapan) macrodiscus b2 cirri smaller and less massive, 30 mm. to 45 mm. (usually less than 40 mm.) long, with 30 — 35 (usually 30 — 33) segments (Australia, except the southern coast, to northwestern Papua) . . af ra a2 Size small; arm less than 140 mm. long; each brachial bears a prominent narrow median carinate process b1 cirrus segments very short, more than twice as broad as long c1 less than XXVI cirri d1 cirri XVI, 18; proximal pinnules very stiff, some of them armed with spine-like tips (Red Sea) audotiini d~ cirri usually about XX, with 22 — 23 segments; proximal pin- nules not stiffened (southern and southeastern Africa, Madagascar, and the islands in the southwestern Indian Ocean) carinata c2 cirri XXVI — XXIX, 23 — 26; proximal pinnules stiffened (Ceylon and southern India, and eastward to Oceania). . . indica b2 cirrus segments longer, in the outer half or two thirds of the cirri much less than twice as broad as long c1 cirri large and stout ; carination of the brachials very low, often scarcely noticeable (e ast coast of India, and eastward to "East Asia") encrinus c2 cirri smaller and less stout ; carination of the brachials high and very prominent, sometimes greatly exaggerated (Venezuela and the southern Caribbean Sea, and southward to southern Brazil) picta ' 3 - i. Tropiometra afra (Hartlai 1 1 ak 1 1 \ii:. Nova Acta dei Ksl 1 eop.-Carol. deutschen Akad. der Naturforsch., vol. 58, 1 \ 1. p. B6, l.i' l .. y>. 52 (Antedon a/ra). .\. II. CLARK. Proc. U.S. Nat. Mus., vol. 34, 1908, p. 31? (specimen from the South Pacific, hut not those from Japan . The Recent Crinoids of Australia, 191 1, p. 7S0. Smithsonian Miscellaneous Collections, vol. 60, [912, Y 10, p. 28. Records of the Western Australian Museum, vol. I, 1914, part. 3. p. 125. II. L. CLARK. Carnegie Institution of Washington Publication N" 212. 1915, p. 106. Stat. 164. 1 42.5 S., 130 4; .5 I Between New Guinea and Misool. 32 Metres. 1 Ex. The centrodorsal is thick-discoidal, the broad dorsal pole slightly concave, 9 mm. in diameter Ihe cirri are XXVII, 33—35, 35 mm. to 45 mm. long. The diameter of the animal at the leve! of the third brachial is about 27 mm. The colour is violet, with large blotches of light yellow. This specimen agrees with others at hand from Australia. VIII. Family Calometridae A. II. Clark. Neometra A. H. Clark. Key to the Species of the Genus Neometra. a1 Dorsal processes on the outer cirrus segments triple, consisting of a median carination with a dorsolateral keel on either side of it; usually about 40 arms b1 cirri XV, 51 — 36, rather slender, about 25 mm. long (one third of the arm length): dorsolateral processes much lower than the median keel, developed only toward the tip of the cirrus ; division series with everted borders, and cirrus segments and brachials with produced distal edges, giving the animal a very rough aspect (Lesser Sunda Islands) sibogae bs cirri XVII — XIX, 39 — 50, very stout, 35 mm. to 45 mm. (usually about 40 mm.) long; dorsolateral processes but little shorter and lower than the median keel, developed from the 1 511' segment onward; division series. brachials and cirrus segments withv unmodified distal edges, so that the animal appears smooth (west co ast <>f Australia! gorgonia I >orsal processes on the outer cirrus segments consisting of a median keel only; 30 or fewer arms .mis; midventral line of the cirri sharp (Philippine .Islands) . . acanthaster b 20 or fewer arms; cirri ventrally rounded c' cirri long. nearly half the arm length; longest cirrus segments twice as long as broad; synarthrial tubercles very high and prominent, as high as broad at the base; 10 \- arms; 42 — 50 cirrus segments (Lesser Sunda Islands) diana 00 c3 cirri shorter, not more than one third of the arm length ; longest cirrus segments not longer than broad; synarthrial tubercles not developed d1 35 cirrus segments; 20 arms (sou th er n J a pa n) multicolor d2 39 — 55 cirrus segments e1 cirri slender and short, less than one fifth of the arm length, with 42 — 55 segments; 20 arms (Andaman Islands) spinosissima e3 cirri longer, one fourth to one third of the arm length; 39 — 46 cirrus segments f1 arms very narrow; distal edges of the brachials rather strongly produced; distal edges of the cirrus segments prominent; cirri more than one third of the arm length, and rather slender; first segment of Px with a high rounded dorsal process, and from half again to twice as broad as the second; first segment of P2 with a prominent high dorsal process ; 15 — 20 arms (Philip- pine and Lesser Sun da Islands) alecto V- arms broader and more rounded dorsallv; distal edg-es of the brachials less produced ; cirri less than one third of the arm length, and stouter, the distal edges of the segments not modified; first segment of Pt not produced dorsally, and only slightly broader than the second; first segment of P2 without a dorsal process; 20 arms (western Australia) conaminis 1. Neometra diana A. H. Clark. A. H. Clark. Zool. Anzeiger, Bd. 39, 191 2, N" 11 12, p. 422 [Calometra diana). Stat. 260. 5°36'.5S., i32°55'.2E. North of Kei Island. 90 Metres. 1 Ex. Stat. 294. io°I2'.2S., I24°27'.3E. South of Timor. 71 Metres. 11 Ex. The centrodorsal is thin discoidal, the flat dorsal pole 3.5 mm. in diameter; the cirrus sockets are arranged in a single fairly regular marginal row. The cirri are XVI, 42 — 43, 30 mm. to 33 mm. long; the first segment is very short, the second nearly or quite twice as broad as long, the third half again as broad as long, the fourth from one third to one half aeain as long- as broad, the fifth- tenth or -eleventh about twice as long as broad ; the following very gradually decrease in length, beyond the eighteenth or twentieth being about as long as the proximal diameter, and the last fifteen or sixteen slightly broader than long; the cirri taper slightly at the tip so that the last three segments before the penultimate are as long as broad, or slightly longer; all of the segments have slightly produced and overlapping distal ends; the longer proximal segments are slightly constricted centrally; on the fourth or fifth a slight subterminal tubercle appears which very slowly increases in size and involves more and more of the dorsal surface of the segments so that the short outer segments possess the high carinate spines characteristic of the species of the family. As a whole the cirri are rather slender, and resemble those of Calometra discoidea. The radials are short in the median, line, but extend upward in the angles of the calyx where they form a broad process with parallel sides and a straight or convex distal horder which entirely and widely separates the bases of th<- IBr,. In width this anterior process from the radials is equal to about one half of the length of the ventrolateral edge of the I Br,. The IBr, are oblong, nearly nr ipiite three times .is broad as long, with the ventro- lateral edge produced int < > a thin flange-like border with a smooth outer edge which is about twice .is wielt- proximally as distally; the proximal end is even with the edge of the interradial process. The IBr (axillaries are broadly pentagonal, not quite twice as broad as long; the dorsal surface is slightly excavated so that the distal borders appear prominent; the thin produced ventrolateral edge of the IBr, is continued on to the IBrs where, viewed ventrally it is seen to have its sides parallel, while viewed dorsally it disappears under the lateral angles of the axillary. The 11 Br series are 2. At each synarthry there is a high and prominent tubercle which in height is approximately equal to the longer (longitudinal) diameter of its base. These synarthrial tubercles recall those of Perometra diomedeae, hut they are proportionately narrower and more slender than those of that species, though nearly as high. The IBr, sometimes has a small rounded tuhercle just anterior to the proximal half of the synarthrial tubercle; the IBr axillary has a more or less prominent narrow rounded median carination running anteriorly from the base of the distal half of the synarthrial tubercle, often terminating, approximately mi a level with the lateral angles, in a prominent tubercle; these are repeated on the ossicles of the I IBr series and on the first two brachials. The arms are 16 or 17 in number in fully grown examples, about 70 mm. long. The brachials are essentially like those of Neometra multicolor, but each bears a prominent low narrow rounded carination which ends distally in a more or less spinous production of the distal edge; this carination lies on the opposite side of succeeding brachials, especially in the proximal portion of the arm. P, is 10 mm. long, slender and weak, composed of 28 — 33 segments of which the first two are enormously enlarged and the remainder very small and about as long as broad; the first segment is irregularly rounded wedge-shaped, about two and one half times as broad as long, about as broad as the lateral diameter of the brachial which bears it; the distal portion of the segment consists of a broad rounded carinate process about as high as the maximum diameter of the ossicle ; the second segment is about three lifths as broad as the first, and narrow, between tour and five times as broad as the maximum (distal) length; the distal border is strongly rounded; the third segment is about as long as broad, and occupies the median thircl of the distal margin of the second. 1', is long, stift" and spine-like, though rather slender, 1 3 mm. to 15 mm. long, with iS — 22 segments of which the first is much enlarged with a high evenly rounded distal process, the second is smaller, trapezoidal, about twice as broad as long with a carinate process having a straight instead of a rounded distal border, the third is slightly longer than broad with a small more or less irregular carinate process usually occupying only a portion of the distal edge; the first segment is not so large as the first segment of 1',. and the second is longer than the corresponding segment of 1'|; the third segment is about half as broad as the second; after th<- third the seerments increase in length so that the sixth 135 is about twice as long as broad, the ninth or tenth about three times as long as broad, and the distal slightly longer; the third and following have a distinct, though low and faint, median carination, and are slightly constricted centrally with prominent distal ends which project at the prismatic angles in the form of short spines. P., is 1 7 mm. long with 20 segments, resembling P3 but slightly stouter and with more elongated segments of which the first two are only slightly enlarged, and the third has a larger carinate process than the corresponding segment of P2; the dorsal carination is also more prominent; P( on the arms arising from the IIBr axillaries is slightly larger and stouter than P.,, but similar to it; the first segment is not enlarged, though distally it is roundedly carinate; the second segment is about as broad basally as the proximal (greater) length, and is slightly carinate distally; the dorsal carination of the pinnule resembles that of P... On the arms arising from the IBr axillaries P^ is 11 mm. long, similar to Ps but smaller and more slender. P3 is 8 mm. long and resembles P4 but tapers more evenly and rapidly; the first segment is without a distal carinate process. The genital pinnules have the third-sixth segments with produced ventral edges protecting the genital glands; this production of the ventral edges reaches a maximum on the fourth, thence decreasing more gradually distally. The distal pinnules are 10 mm. long with 15 segments. The disk is completely covered with a solid pavement of plates as in the other species of the genus. In the perisomic angles about the mouth are five prominent though small orals, probably of perisomic origin, each of which typically has at each proximal angle a large oblong plate continuing it outward. The colour is light purple, the cirri and pinnules white. Another large specimen resembling the preceding has 17 arms about 70 mm. long; the IIBr series are absent on one ray, and on one half of another ray ; the cirri are XVI, 42 — 50, 25 mm. to 28 mm. long; P., and P3 may have a narrow irregular dentate carination on the fourth-fifth or fourth-sixth segments. Of the remaining examples one has 13 arms 60 mm. long; one has 10 arms 55 mm. long; one has 11 arms 45 mm. long; one has 10 arms 35 mm. long; one has 11 arms 30 mm. long, and one has 11 arms 25 mm. long; of the three remaining, which are very small, one has 1 3 and one 1 2 arms. The specimen from Stat. 260 has 16 arms 45 mm. long; there are 42 segments in the cirri. 2. Neometra sibogac A. H. Clark. A. H. Clark. Zool. Anzeiger, Bd. 39, 1912, N° u/12, p. 421. Stat. 305. Mid-channel in Solor Strait, off" Kampong Menanga. 113 Metres. 4 Ex. Centrodorsal thia discoidal, the broad polar area flat, 4 mm. in diameter; cirrus sockets arranged in a single fairly regular marginal row. Cirri XV, 31 — 36, about 25 mm. long, large and stout; their bases are crowded against those of the adjacent cirri, and the first segments are more or less sharply flattened laterally; the first two segments are about twice as broad as long, the following gradually increasing in length and becoming ne'arly, sometimes quite, as loog as Ito. ui on the fifth; the next two three are similar; the following verj gradually decrease in length so that those in the outer fourth of the cirri are about twice as broad as long; in their outer fourth of fifth the cirri taper very gradually so that the tip is comparatively slender. The distal edges ol the segments all around are everted and prominently overlapping. From the tenth segment onward there is evident a carination of the mid-dorsal line, at first affecting only the (listal part of the lents but soon rising into a high sharp keel occupying the entire length of the dorsal surface, the crest of which is parallel to the long axis of the cirri. In the 'listal portion of the cirri. beginning on the tenth-eighteenth (usually on the fourteenth or fifteenth) segment before the terminal claw a small tubercle appears on either side of the median carination near the lateral borders of the segmtfnts as viewed dorsally; these tubercles rapidly elongate and develop into supplementary keels parallel to the median keel and similar to it, but lovver. The radials are even with the edge of the centrodorsal in the median line, but are strongly produced in the angles of the calyx where they separate widely the bases of the IBr, ; the ventral edge of this anterior process, which is straight and not spatulate nor otherwise modilied, is equal in length to the lateral edges of the IBr,; the cirrus sockets are more or less supported by the radials as in Oreometra mariae. The arms are from 30 to 40 in number, 70 mm. to 75 mm. long, arranged in 2, 1. 1, 2 or 2. 2. 2, 2 order-, some rays mav bear as many as nine arms in which case, as in all cases, the extra axillarv is external; the division series extend themselves horizontally from the centro- dorsal (that is, at right angles to the dorsoventral axis of the animal) and are very widely separated; all of the division series are 2; they are very narrow and strongly rounded; the extreme ventrolateral border of the ossicles of the division series is produced into a thin flange with a smooth and thin outer border which runs from the distal edge of the interradial production of the radials along the sides of the ray as far as the second brachial ; but this is only visible dorsally as far as the IBr axillary; from the ends of the interradial processes from the radials these flanges are (viewed ventrally) perfectly parallel as far as the IIBr axillary, but as the [IBr series make a very considerable angle with each other the flanges necessarily disappear from dorsal view at the IBr axillary. The union of the ossicles of the IBr series is extremely close, appearing like a syzygy, but the union of the ossicles of the other division series is not so modified. The proximal and distal borders of the ossicles of the division series, including the distal borders of the IBr axillary, are prominently everted, but smooth and not spinous, giving the division series a singularly and characteristically rugged appearance. The arms resemble those of .\'. multicolor, the brachials after the eighth or ninth being about as long as broad, triangular, with the outer edge somewhat convex; the distal edges of the brachials are produced, thin, and finely spinous, this production being highest on the side bearing the pinnule (toward the longer side) where it begins abruptly; in the outer part of the arm it gradually becomes less and less marked, beginning less and less abruptly. Sy/ygies occur between brachials 3 f 4. 11 -|- 12 to 15 + 16 (usually 1 1 j- 1 2 or 124-13), and again after 4 oblique muscular articulations; the distal intersyzygial interval is 3 oblique muscular articulations. i37 P, is from 10 mm. to 11 mm. long-, composed of 29 segments, slender, but not so weak as is usual in the genus, and more or less stiffened; the first tvvo segments are enormously enlarged, subequal, three to four times as broad as long, and nearly twice as large as the corresponding segments on P2 ; the third segment occupies about one third of the median distal border of the second, and is about as broad as long; the following segments are slightly longer than broad, becoming about as long as broad in the distal half of the pinnule. Fa is very small and weak, not half so long as P: ; on the inner arms Pl resembles P„, and on the outer side of the IIBr series it is intermediate between P„ and P.. P. is 11 mm. to 12 mm. lono- with 1 M ö * 18 — 21 segments of which the fourth and following are about twice as long as broad; the pinnule is straight and stiff, but not particularly enlarged; the first segment is about three times as broad as the median length, about twice as broad basally as the third ; the second is of about the same length, but is not quite so broad; it bears a slight rounded carinate dorsal process; the third is about half again as long as broad. On the inner arms P., is the longest. On the outer arms P., is 15 mm. long with 17 segments which are more elongate than those of P3, nearly or quite three times as long as broad ; the pinnule is similar to P., but very slightly stouter, and the second segment has the carinate process much reduced; the first and second segments are not quite so much enlarged, in fact scarcely enlarged at all ; the third segment is narrowly carinate, at least basally. P4 is 11 mm. long with 15 segments, those beyond the third much elongated; the second-fourth are slightly carinate. P, is 9 mm. long with 13 segments, resembling Pv but the component segments are not quite so long; there is a slight production of the distal dorsal border of the outer segments on P4, which increases on P. and P6. P6 is 7 mm. long with 13 segments, resembling P.. P„ is 5 mm. long. P7 and Ps become stouter and more sharply prismatic than the preceding, which are rounded prismatic. The distal pinnules are rather slender, 8 mm. long with 16 segments of which the terminal five are suddenly and disproportionately small and short. The disk is lacking in all the specimens; the side- and covering-plates are highly developed as in the other species of the genus. The colour is sulphur yellow, crossed on the arms and cirri with numerous narrow purple bands, or yellow, the pinnules with narrow purple bands. This species has the broad and patent habit characteristic of the many armed species of such genera as Comanthus. The centrodorsal is thin, but very broad, and bears about its margin a regular row of stout strong cirri of which the proximal portions lie all in the same plane, the distal portions being recurved. The arms spread out horizontally from the calyx just as the cirri do from the centrodorsal, and so thin is the latter that the dorsal portion of the earlier division series rests upon and among the horizontal earlier portions of the cirri. The eversion of the borders of the ossicles of the division series and of the earlier brachials suggests the general aspect of such species as Pectiiiometra jiavopurpjirea. 3. Neoiuetra alccto (A. H. Clark). A. H. Clark. Proc. U.S. Nat. Mus., vol. 39, 191 1, p. 544 [Calometra alccto). Records of the Western Australian Museum, vol. 1, 1914, N" 3, p. 130. SIBOGA-EXl'EDITIE XLII /'. iS Stat. 305. Mid-channel in Solor Strait, ofl Kampong Menanga. [13 Metres. 1 Kx. There are apparentlj 20 arms (12 on the three rays preserved) about 70 mm. long. The cirri are XVII. One cirrus, not quite tuil size, with 39 segments remains. This example well with specimens from the Philippine [slands. Pectinometra A. II. Clark. \\<\ to the Species of the Genus Pectinometra. ,1 Ossicles "I the división series and lirst two brachials with no tracé of median rination, rugose <>n the dorsal surface, and with finely crenulate edges which are not everted; cirri X — XV, 26 — 40 (usually 34 — 36); 15 — 20 arms Philippine Islands) carduum Issicles of the IBr series with a prominent high median keel; a similar but much less developed (sometimes obsolete) keel on the ossicles of the IIBr series and the first two brachials; the edges of the ossicles of the división ries may be everted, but are never crenulate; usually 20 arms b1 cirri with 41 — 48 segments; keel on the ossicles of the IBr series very high and prominent, especially proximally; -edges of the ossicles of the división series only slightly or not at all everted (Malay Archipelago and the Lesser Sunda Islands) magnifica 1' cirri with 30 segments; keel on the ossicles of the IBr series lower and more uniform in heisrht: edyes of the ossicles of the división series prominently everted. (sou the rn Japan) flavopurpurea 1. Pectinometra magnifica ('A. H. Clark). A. H. Clark. 1'roc. Riol. Soc. Washington, vol. 22, 1909, p. 77 [Calometra magnifica). The Crinoids of the Indian Ocean, 191 2, p. 1K5, fig. 31, p. 1S6. Stat. 94. 50 1 f .2 N., 1 19°35'.4 E. Sulu Sea. 450 Metres. 1 Ex. This specimen may be described as follows : 1 he centrodorsal is very small, apparently truncated conical, the dorsal pole very slightly convex, obscurely tubercular, 1.5 mm. in diameter; the cirrus sockets are arranged in ten columns of two, more rarely three, each. rhe cirri are XXII, 37 — 40 (usually 37), 28 mm. to 32 mm. long; the segments gradually increase in length to the sixth, which is about as long as broad, and after the ninth gradually decrease so that after the nineteenth they become about twice as broad as long; the terminal fifteen to eighteen segments taper gradually so that the last few segments are very small; all thi ments have slightly overlapping ventral distal ends; after about the ninth segment the (listal dorsal ends of the segments become prominent, and in the outer half ot the cirri the segments bear the characteristic high dorsal keels. 139 The ends of the basal rays are visible as prominent rounded dorsoventrally elongate tubercles in the angles of the calyx. The distal borders of the radials are just visible beyond the edge of the centrodorsal ; they are strongly concave, curving upward over the ends of the basal rays and meeting just above them in the angles of the calyx ; they are slightly produced outward, and are continued upward into very narrow interradial processes which entirely separate the IBrr The IBrj are very short, chevron shaped, slightly less in median than in lateral length ; the proximal edge is slightly swollen, the lateral edges slightly turned ontward, straight, with a low blunt tubercle at the distal and proximal angles and sometimes a second near the former ; the median line of the ossicle is occupied by a very high narrowly rounded crest, which is much higher proximally than distally. The IBr„ (axillaries) are irregularly rhombic, not quite twice as broad as long, with the distal and lateral angles rather strongly produced; the proximal half of the median line bears a narrowly rounded crest which is much lower than that on the IBr^ this crest posteriorly is of the same height as the anterior end of the crest on the \Brl which it adjoins; anteriorly it sinks gradually downward to the level of the general dorsal surface of the ossicle; the proximal borders of the IBr.2 are, except laterally, slightly thickened and produced over the distal borders of the IBr,, and coarsely and obscurely scalloped; the distal edges are slightly everted, but not otherwise modified. The IIBr series are 2, resembling the IBr series but without any tracé of carination or modification of the proximal or distal borders; the IIB^ bears a broad ventrolateral process, at the base nearly as wide as the segment, in height equal to about half the distance from the lateral margin to the median line, outwardly rounded, sometimes with one or two coarse low processes or blunt tubercles. The 20 arms, which are 70 mm. long from the border of the radials, resemble those of the other species of the genus ; the brachials have rather prominent finely spinous distal ends. This individual only differs from the type of P. magnijïca (which is before me) in the greater development of the keel on the IBr^ in the very faint keel on the IIBr series, and in the slightly Jonger proximal cirrus segments. It is undoubtedly a young example of that species. A third specimen of this interesting form was dredged by the " Albatross'' at Stat. 5661, in 180 fathoms in the Flores Sea (Cat. N° 35972 U.S. Nat. Mus.). IX. Family Thalassometridae A. H. Clark. Key to the Subfamilies of the Family Thalassometridae. a1 Pj shorter and smaller than P.,, but similar to. it (southern c o a s t of Australia northward to southern Japan; 11 — 252 Metres) Ptilometrinae a3 Pj larger and longer than P., (C a r i b b e a n Sea and the B ay of B i s c a y southward to Ascension and T r i s t a n da Cunha; tra to South Africa éuid the ( rozel [slands, and eastward i<> the Ivermadec, Galapagos, Hawaiian and western Alcutian [slands, and southern Japan; littoral, and down to 2926 Metres) Thalassometrinae i*1 Subfamily Ptilometrinae A. II. Clark. Ki\ to the Genera of the Subfamily Ptilometrinae. Centrodorsal laree and broad. thick discoidal or columnal. the numerous cirri oselj crowded and irregularly distributed, though tending to arrange them- selves in fifteen columns; the radial areas of the centrodorsal are never differentiated southwestern, southern, and southeastern Australia) Ptilometra a Centrodorsal a short, more or less pentagonal, column, with a conical apex ; the comparativelj few cirri are arranged in ten definite columns, two to each radial area; the radial areas are separated from each other by more or less de-, ridges b1 10 — 13 arms; the pinnules in the proximal third of the arm are much shorter than those in the distal half, and are composed of segments which, except occasionally at the extreme tip, do not have overlapping and spinous distal ends; the longer proximal cirrus segments have approximately straight ventral and dorsal borders (as viewed laterally) which are usually parallel, though they may diverge very slightly distally ; there is no central constriction, or production of the distal edge (Lesser Sunda I slands to southwestern Ja [jan) Asterometra 1>- 20 — 30 arms; the pinnules in the proximal third of the arm are as long as, or even longer than. those in the distal half, and are composed of segments mam or most of which are constricted centrally with produced and spinous distal ends; the longer proximal cirrus segments are usually mort: or less constricted centrally with prominent distal ends the ventral border of which usually more or less overlaps the base of the succeeding segment, and may be produced into a long ventral spine ilf of Martaban to northern Celebes and the Philip- pinelslands) Pterometra Asterometra A. II. ('huk. Key 1 Species of the Genus Asterometra. Elements of the IBr series and hrst two brachials without prominent median Is or tubercles b1 cemrodorsal small and conical Formosa) lepida centrodorsal large, columnar, with a conical ap 141 c1 cirri longer than the arms, composed of 100 — 120 segments; an indistinct narrow line sometimes traceable on the elements of the IBr series and the first two brachials indicates an incipient median keel (southwesternjapan) macropoda c3 cirri about three fourths as long as the arms, composed of 80 — go segments ; arms 80 mm. long cl1 distal pinnules 9 mm. long, with the outer segments not more than twice as long as broad ; overlapping spines on the outer brachials long, strongly curved, and sharp pointed; a rounded median tubercle on the radials; central portion of the elements of the IBr series and first two brachials swollen, but with no indication of a median line (southwestern Japan) . . . anthus d2 distal pinnules 13 mm. long, with the outer segments three times as long as broad, or even longer; overlapping spines on the outer brachials short, not much curved, more or less blunt ; radials with a dorsoventrally elongate tubercle; IBr series with a faint low median carination (Sahul Bank) acerba a2 Elements of the IBr series and first two brachials with prominent median keels or tubercles b1 elements of the IBr series and first two brachials with a very high and continuous narrow median keel c1 the keels on the elements of the IBr series and first two brachials are strongly convex in profile view, so that the outline of the lower part of the animal is formed by a series of convex scallops (Sahul Bank to Ti mor and the Kei 'Islands) mirifica c2 the crest of the keels on the elements of the IBr series and first two brachials is straight, parallel with the longitudinal axis of the segments; cirri XX, 77 — 86, 60 mm. to 65 mm. long; arms 100 mm. long (Philippine Islands) iris fata b2 the IBr, bears a slightly elongated sharp median tubercle, or a short median ridge; the axillary bears three sharp tubercles; the first two brachials each bear a sharp prominent tubercle; cirri XX, 80, 80 mm. long; arms 100 mm. long (Kei Islands) longicirra 1. Aster ometra mirifica A. H. Clark. Bell. Journ. Linn. Soc. (Zool.), vol. 24, 1893, p. 339 {Antedon longicirra, part). A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 146 {Asterometra mirifica). Crinoids of the Indian Ocean, 19 12, p. 190, fig 33, p. 192 {Asterometra mirifica). Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 43 {Asterometra mirifica). Stat. 260. 2.3 miles N. 630 VV. from the northern point of Nuhu Jaan, Kei Islands. 90 Metres. 3 Ex. Stat. 294. io°i2.2S., i24°27'.3E. Timor Sea. 73 Metres. 5 Ex. 1 p From Stat. 260 there are two verj smal! specimens, and one nearly of full size; the latter resembles th<- type from the Sahul Bank ven d<>sely; the arms are 70111111. long; tin- cirri, which are composed of s7 gments, are from 7'' mm. to 75 mm. long. rhe material from Stat. 294 consists of five very small specimens, and a few cirri from larger exampli The keels on the elements of the IBr series and on the first two brachials are considerably higher in this species than in ./. cristata. :. Aster ometra longicirra (P. II. Carpenter) P. II. CARPENTER. "Challenger" tteports. Comatulae, [888, p. 103, pi. 17 {Antedon longicirra). Hamann. Bronn's Klassen mul Ordnungen des Tier-Reichs, vol. 2, 1907, Abt. 3, p. 1578 'edon longicirra). \. II. CLARK. Smithsonian Misccllaneous Collections (Qnarterly Issue), vol. 50, 1907, part 3, p. 359 [Ptilometra longicirra). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 147 [Asterometra longicirra-. compared wit ll A. 111 1 rij'; Vidensk. Medd. Tra den naturhist. Forening i Kobenhavn, [909, p. 1S2 [Asterometra longicirra-, compared with A. lepida). Proc. U.S. National Museum, vol. 39, 1911, p. 547 [Asterometra longicirra; compared ui th .-/. cristata). Crinoids of the Indian Ocean, [912, p. 190 {Asterometra longicirra). — — Smithsonian Miscellaneous Collections, vol. 61, 1913, X" 15, p. 43 [Asterometra longicirra). Stat. 260. 2.3 miles X. 63° W. from the northern point of Nuhu Jaan, Kei Islands. 90 Metres. 1 Ex. The centrodorsal is columnar, 5.5 mm. in diameter at the base and 3 mm. in interradial height; the cirrus sockets are arranged in ten columns of two each ; the columns of adjacent radial areas are close together, separated by a slightly marked irregular rounded ridge which in width is equal to from one half to one third the diameter of the adjacent sockets; the two columns of each radial area are separated in the midradial line by a slightly concave bare space equal in width to about one half the diameter of a cirrus socket; the dorsal pole is slightly concave, and is marked by five large, though low and obscure, tubercles as in the other species of the genus. The cirri are about X, 87 — 98, 70 mm. to 80 mm. long, moderately slender; the longest proximal cirrus segments are about twice as long as broad. The ends o\ tin: basal rays are prominent as small tubercles in the angles of the calyx. lh'' radials have a prominent median dorsoventrally elongated tubercle; the IBr, and the proximal third or half of the axillary bear a narrow low rounded median carination, on the former highest distally, on the latter highest proximally, the highest points being usually marked by a slight elêvation in the general surface; traces of this are seen on the first two brachials. In some cases there is a tubercle toward the distal border of the IBr,. and a similar tubercle toward the proximal border of tin; axillary. the latter with tuint traces of broad tubercles anterior to and on rither side of it ; each of tin- first two brachials also bears a tubercle. The arms are 105 mm. long. 143 This appears undoubtedly to be an undeveloped specimen of A. longicirra\ the cirri are more slender than in the type, and are composed of relatively longer segments, and the ornament- ation of the elements of the IBr series and iïrst two brachials is scarcely more than indicated. Pterometra A. H. Clark. Key to the Species of the Genus Pterometra. a1 No ventral spines on the longer proximal cirrus segments: cirri numerous, XXX — XXXV, composed of 80 — 122 segments; 20 arms; no tracé of carination on the division series b1 cirri excessively long and stout, from one fourth to one third again as long as the arms (100 mm. to 118 mm. long), composed of 109 — 122 segments; all ten columns of cirrus sockets closely crowded against each other; arms 90 mm. long (Philippinelslands) magnipeda b2 cirri shorter and more slender, from three fourths to four fifths of the arm length (75 mm. to So mm. long), composed of 80 — 85 segments; columns of cirrus sockets separated interradially by a broad shallow grooye, radially by a narrow flat bare area ; arms 100 mm. long (Gul f of Martaban to Da mar Island and the Philippines) . . pulcherrima a2 Longer proximal cirrus segments bearing on the midventral portion of the distal edge long sharp spines vvhich extend over the bases of the succeeding segments; cirri XX — XXX (usually XX — XXV), composed of 70 — 1 1 3 segments; 20 — 30 (typically about 30) arms b1 proximal portion of the animal very broad, the division series and arms as far as the seventh brachial (at least) as seen in lateral view diverging rapidly, at an angle of approximately 900; colour, in alcohol, uniform brown c1 cirri shorter, more numerous, and more slender, XXX, 86, 50 mm. long; arms 80 mm. long (Philippine Islands) splendida c2 cirri longer, less numerous, and stouter, XX — XXV, 99 — 113, ö mm. long (northern Celebes) venusta tl —& b2 proximal portion of the animal very narrow, the division series and arm bases as seen in lateral view diverging very slowly, at an angle of about 450; colour in alcohol violet, blotched and variegated with white; 20 — 30 arms (Philippinelslands) trichopoda 1. Pterometra venusta A. H. Clark. A. H. Clark. Zool. Anzeiger, vol. 39, 1912, N° 11 12, p. 424. Stat. 117. Entrance to Kwandang Bay, Celebes. 80 Metres. 4 Ex. The centrodorsal is thick discoidal or columnar, the sides nearly parallel, 6 mm. broad I 1 1 at the base and 2.5 mm. high; the cirrus sockets are arranged in ten equally spaced columns, each column separated from its neighbours <>n either side by a shallow groove from one fourth me third of a cirrus socket in width; there are tw>, more rarely three, cirrus sockets to a column; th< il pole of the centrodorsal bears .1 rosette of five prominent tul)ercles. The cirri an XX XXV, 99 -113 (usually nearer the latter), 77 mm. long, stout basally and tapering slightly distally, though tliis distal taper is mme gradual and therefore nol so marked .is in Pterometra trichopoda\ the longest cirrus segments are from one third to one half again as long as broad; in the earlier segments the ventral distal edge is rather prominent; after the eighth the median portion begins to project, overlapping the base of the ne\t suc- ceeding segment, this after the eleventh or twelfth becoming a sharp ventral spine which persists . - far as the twentieth, or even the twenty-third segment; at first this ventral spine mak' 'iisiderable angle with the longitudinal axis of the segments, but distally its outer part becomes more nearly parallel to it; the cirri are more broadly rounded ventrally than those of Pt. trichopoda, and there is no well developed sharp ridge or keel extending backward from the ventral spine along the. midventral line of the segments; the dorsal processes arise ver) slowly, and are never very prominent: they lirst appear on about the twenty-third segment; the cirri are moderately compressed laterally, less so than in Pt. trichopoda. The radials and division series resemble those of Pterometra spfendtda, but are slightly more robust. lhe arms are from 22 to 28 in number, and resemble those ot Pt. splendida. In the type (which has 28 arms) Pj is 10 mm. long with 18 segments of which the terminal four or five are abruptly smaller than the preceding; it is considerably stouter and more sharply triangular than P, in Pt. trichopoda\ 1', is 11.5 mm. long with 16 segments, strongly though not sharply triangular in section, tapering evenly to a slender tip; the outer segments are about tuier as long as broad, without projecting distal edges; P:i is 15 mm. or 16 mm. long with 16 segments of which those in the distal half are much elongated and slender, with prominent spines at the prismatic angles; P, is 17 mm. long with 15 segments, similar t<> 1' but with a slightly more even taper and hence appearing stouter distally; 1' is 17 mm. long with 1 ( segments, resembling P4; P(. is 16.5 mm. long with 14 segments, resembling 1' P is [8.5 mm. long with 16 segments, resembling P0; Pe is slightly stouter in the basal portion than the preceding pinnules; on the succeeding pinnules the relative length oi the stout basal portion increases so that the genital pinnules are broader and more sharply triangular than the preceding with shorter segments ot which only the outermost have spines at their prismatic angles; the distal pinnules are about 17 mm. long, becoming gradually shorter toward the arm tips. A specimen with 22 arms about 95 mm. long is rather larger than the others, in all ot which the arms are broken off at the base. P, is 9.5 mm. long with 14 segments; 1' is il mm. long with 14 segments; 1' is 15.5 mm. Ion- with 17 segments; P, is 17 mm. long with [5 segments; I', is 18.5 mm. long with 17 segments; 1\ is 1S.5 mm. long with [6 seg- ments; I'. is 19 mm. long with 19 segments; 1', is [9.5 mm. long with iS segments; 1' 10 mm. long with 1 ments. 145 2. Pterometra pulchcrrima (A. H. Clark). A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, p. 400 [Ptilometra pulcherrima). Proc. U.S. National Museum, vol. 39, 191 1, p. 547 {Aster ometra pulcherrima). Crinoids of the Indian Ocean, 19 12, p. 193 [Asterometra pulchcrrima). Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 1 Ex. This specimen agrees vvell with the type. There are twenty arms 90 mm. to 95 mm. long. The cirri are XX, 92 — 96, yS mm. long. The colour in alcohol is white. 2nJ Subfamily Thalassometrinae A. H. Clark. Key to the Genera of the Subfamily Thalassometrinae. a1 Ten arms b1 genital pinnules with the third-fifth segments greatly expanded, forming a broad roof over the gonads ; calyx and arm bases smooth ; 30 — 40 cirrus segments (Straits of Florida and southeastward to Grenada) Horaeometra b3 no expansion of the segments of the genital pinnules c1 ossicles of the division series and of the arm bases with numerous prominent spines which may be more or less confined to the borders of the ossicles and to the median line, or generally distributed over the dorsal surface ; ossicles of the division series and first two brachials sometimes with a slight carinate process bearing spines along the crest; arms beyond the second brachial well rounded dorsally, never carinate ; Pj very stout, much stouter than the succeeding pinnules, though with a delicate tip; 10 — 13 (usually 10) arms; division series usually 2, sometimes 4(3 + 4) (Morocco and Madeira south- ward to Ascension and the Crozet Islands; east Africa to the Kermadec, Galapagos, Hawaiian and western Aleutian Islands, and southern Japan). ., Thalassometra c2 ossicles of the division series and of the arm bases smooth, without spines on the dorsal surface, though they may have irregular processes on their lateral borders, and isolated spines on their proximal and distal borders; Pp though larger and stouter than those succeeding, is not especially enlarged d1 cirri long, with more than 40 segments e1 division series and arms very narrow and strongly compressed laterally; a prominent narrow, usually low, keel runs the entire length of the division series and arms; the lateral borders of the ossicles of the division series and of the arm bases bear coarse irregular spines; the proximal cirrus segments have a SIBOGA-EXPEDITIE XLIl/'. 19 i46 distinct keel in the middorsal line and usually ;i smal! spine in the centre of the distal dorsal border; 10 — i: arms; IIBr series, if present, 2 (Queensland and Timor to the Philip- pine Islands; southern Japan) Daidalometra e' arms not narrow nor strongly compressed laterally, and with 110 carination; sides and proximal and distal edges of the ossicles of the division series nearly or < j nïte smooih f' division si-ri>-s and arms broad, wel] rounded dorsally; habitus rol. ust (Kermadec Islands to the Moluccas and the Philip pin es) Aglaometra t division series and arm bases narrower, subcarinate ; general habitus slehder (Laccadive Islands to the Lesser Sun da Islands, Fiji, the Kermadec Islands and New South Wales) Stiremetra d cirri short and stout, with less than 30 segments; division series and arm bases narrow, well rounded dorsally, appearing narrow and only slightly rlattened against their neighbours; 10—20 arms; division series all 2 (Kei Islands to southern Japan and the Hawaiian Islands) Parametra a More than 10 arms b1 dorsal surface of tin- ossicles of the division series and of the arm bases with numerous prominent spines which may be more or less confined to the borders of the ossicles and to the median line, or generally itributed over the dorsal surface c' more than 15 arms; division series strongly rounded dorsally, appearing relatively narrow d1 IIBr series all, or mostly, 4 (3 -j- 4); 15 — 28 arms; a more or less prominent median keel on one or both of the elements of each division series and oi the first brachial pair; 110 overlapping spines on the brachials the distal borders of which are evenly rounded and very spinous (Moluccas to the Philippine and II awaiian Islands) Oceanometra d2 all the division series 2; 30 arms, a single IIIBr series being developed on the inner side of each IIBr series; 110 tracé of a median keel on the elements of the division series or of the tirst brachial pair; each brachial beyond the fifth or sixth bears a Ion-. broad, thin, sharp pointed curved spine of which the hase entirely spans the ossicle longitudinally and the tip, directed nearly parallel t<> the axis of the arm. extends tor some distance over th< suc- ng brachial: on succeeding brachials these s|)ines alternate either side of the median line; toward the end of the arm they 147 decrease in height and resolve themselves into a sharp carinate process crowned vvith spinules; P,, though longer and stouter than the following, is slender and evenly tapering, composed of segments which beyond the second are much longer than broad, more or less constricted centrally, with produced and spinous distal edges (Yucatan to Grenada, West In dies) Stylometra c'- less than 15 (10 — 13, usually 10) arms; division series usually 2, sometimes 4 (3 -f- 4) ; Pj very stout, much stouter than the succeeding pinnules, though with a delicate tip (Morocco and Madeira southward to Ascension and the Crozet Islands; east Africa to the Kermadec, Galapagos, Hawaiian and western Aleutian Islands, and southern Japan). . . Thalassometra b3 ossicles of the division series and of the arm bases smooth, without spines on the dorsal surface, though they may have irregular processes on their lateral borders ; Pv though larger and stouter than those suc- ceeding, is not especially enlarged c1 not more than 15 arms d1 cirri with more than 50 segments, very long and very slender ; arms slender, very narrow, strongly compressed laterally ; a prominent narrow median keel on the ossicles of the division series, which is continued the entire length of the arms; 10 — 12 arms; division series 2 ; proximal cirrus segments with a distinct keel in the mid- dorsal line, and usually with a small spine in the middle of the distal dorsal edge (Oueensland and Ti mor to the Philip- pine Islands; southern Japan) Daidalometra d2 cirri with less than 35 segments e1 cirri with 30 — 34 segments, of moderate length and moderately slender ; ossicles of the division series broad, very slightly convex dorsally but with a prominent sharp median carinate process, everywhere in close lateral apposition ; lateral portion of the distal borders of the IBrj, IIB^ and the first brachial produced, forming rounded thin anterior processes which im- bricate over the bases of the succeeding ossicles ; brachials with a very faint and obscure median carination ; 13 — 15 arms; division series 2 (southwestern Japan) Lissometra e2 cirri with at most 27 (usually between 20 and 25) segments, short and stout; division series and arm bases well rounded dorsally, appearing narrow and only slightly flattened against their neighbours; 10 — 20 arms; division series 2 (Kei Islands to southern Japan and the Hawaiian Islands) . Parametra c2 more than 1 5 (usually 20) arms [48 irri with at mosl 27 (usually between 20 and 25) segments, short and stout; division series and arm bases well rounded dorsally, appearing narrow and only slightly flattened against tln-ir neigh- ours; 10 — 20 arms; division series 2 Kei Islands to southern la pan and the Hawaiian Islands) Parametra irri with more than |.o segments, long, slender or stout e1 division series and arms very narrow, slender, strongl) compres- sed laterally, sharply carinate throughout; cirri very long and verj slender: 20 arms; division series 2 (Kei Islands to the Philip pines, and northward to southern Japan) . Stenometra division series and arms usually stout, the latter well rounded dorsally, at least in the earlier portion ; the ossicles of the division series and the tirst two brachials are usually smooth dorsally. but may have a very slight median keel, which is not continued on to the arm bases f1 IIBr series 4(3 + 4); division series and arm bases very strongly rounded dorsally, the dorsal surface entirely free of spinules or carinate processes (Bay of Biscay to the Canaries and Ascension I si and; southern and eastern A f r i c a t o the Moluccas and the Philip- pines) Crotalometra 1 all division series 2; ossicles of the division series usually with a flattened dorsal surface, perfectly smooth, with swollen borders, or with a lateral, proximal and distal border of thickly set fine spinelets (Caribbean Sea; sou th western [ n d i a n Ocean to the Moluccas, the Philippines, the Hawaiian Islands and southern Japan) . . Cosmiometra Crotalometra A. H. Clark. Key to the Species of the Genus Crotalometra. a1 Centrodorsal thick discoidal, with the large stout cirri arranged in an irregular partially doublé row about the periphery li about 30 cirrus segments of which the longest are about twice as long as broad; brachials from the first onward with the distal edges turned ontward and produced, and the ossicles of the division series with the distal edges prominent, giving the anima! a rugged appearance (Bay of Biscay to the Canary Islands; 882- 1480 Metres flava b j.o 50 cirrus segments, the longesl only slightly longer than broad; division series and arm bases nearly or quite smooth (Baj ol Biscay to As cension I si and; 755 — [480 Metres porrecta 149 a~ Centrodorsal truncated conical, the cirri arranged in ten columns, two in each radial area; 60 — 70 cirrus segments b1 brachials after the proximal third of the arm with the central portion of the distal edge produced into long overlapping spines which are more or less fiattened dorsoventrally and rounded or truncated at the tip-, 12 — 16 arms (Laccadive Islands; 1265 Metres) sentifera b2 brachials with the distal borders not provided with long overlapping spines c1 70 or more cirrus segments (Malay Archipelago and the Philip- pine Islands; 54 — 414 Metres) rustica c3 60 — 63 cirrus segments d1 radials concealed by a narrow rim about the proximal margin of the IBi'j; ends of the basal rays very prominent as high dorsoventrally elongate tubercles which are usually rather lönger than the dorsoventral length of a cirrus socket; sides of the IBrj in the interradial angles cut away to accomodate the ends of the basal rays; 17 — 18 arms (Moluccas; 1595 Metres) marginalis d3 no produced proximal border on the IB^ concealing the radials, which form a closed ring about the calyx separating the ends of the basal rays from the IBrj (South Africa; 540 — 810 Metres). . . . magnicirra 1. Crotalometra flava (Koehler). KOEHLER. Revue biol. du nord de la France, vol. 7, 1895, p. 475 {Antedon flava). et Vanev. Buil. du Mus. d'hist. nat., Paris, 1910, N° I, p. 31 {Antedon [Crotalometra] flava). A. H. Clark. Proc. U.S. National Museum, vol. 40, 191 1, p. 37 {Crotalometra flava). 2. Crotalometra porrecta (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 250, pi. 52, figs. 3 — 5 {Antedon porrecta). KOEHLER et VANEV. Buil. du Mus. d'hist. nat., Paris, 1910, N" 1, p. 32 {Antedon [Crotalo- metra | porrecta). A. H. CLARK. Proc. U.S. National Museum, vol. 40, 191 1, p. n {Crotalometra porrecta). Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 46 {Crotalometra porrecta). 3. Crotalometra sentifera A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 147 {Crotalometra sentifera). Crinoids of the Indian Ocean, 1912, p. 201, fig. 37, p. 202 {Thalassometra sentifera). 4. Crotalometra rustica A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 80 {Crotalometra rustica). Proc. U.S. National Museum, vol. 39, 1911, p. 550 {Crotalometra infelix). Crinoids of the Indian Ocean, 1912, p. 198, fig. 36, p. 199 {Thalassometra rustica); p. 203 {Thalassometra infelix). 5. Crotalometra marginalis \ II Clark), \ II. Clark. Zool. Anzeiger, vol. 59, [912, N" 11 [2, p. 424 [Thalassometra marginalis). Mid-channel between the Lucipara and Schildpad [slands. [595 Me tres. 2 Ex. One of the specimens lias 17 arms about 95 mm. long; two of the IIBr series are 2, and five are 1 . the cirri are 50 mm. long with 60 segments; the other, of the same . lias [8 arms with all of the IIBr series 4(3 + 4). The individuals have about half the arm and cirrus length of C. rustüa, tho apparently they represent a species very closely related to it. rhe ccntrodorsal is low, rounded conical; the cirrus sockets are arranged in columns of two each, the two columns in each radial area being in close contact with those of adjacent iorly but separated interiorly by a bare triangular area about half as wide as a cirrus socket which comes to a point just bevond the last functional socket and is continued thence as a narrow line to the dorsal pole. The proximal edge of the IBr, are produced into a narrow rim which projects over the radials. entirely concealing them ; the ends of the basal rays are very prominent as high dorso- ventrally elongate tubercles which are usually rather longer than the dorsoventral length of a cirrus socket; in the interradial angles the IBr, are cut away to accomodate the basal rays, whereas in C. rustten they are separated from the basal rays by the radials which form a continuous band all around the calyx. In one specimen a small portion of the lateral edge of the radials is visible as two elongate tubercles meeting in a triantrle over the ends of the basal rays 6. Crotalometra magnicirra (Bell). Bell. Marine Investigations in South Africa, vol. 3, 1905, p. 141 {Antedon magnicirra); p. 142 (Antedon magnicirrus) ; pi. 4 (Antedon magnicrinus). \. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, X"i5, p. 45 (Crotalometra magnicirra . Oceanometra A. II. Clark. Key to the Species of the Genus Oceanometra. a' Not over 60 cirrus segments; keels 011 the division series and first two brachials confined to the distal element of each pair (axillaries and IIBr, when not axil- lary, and second brachials), being entirely absent from the proximal elements; larj^e and very robust, th<- cirri exceptionally stout; 17 arms 1S0 mm. long; cirri XXX, 55 — 60, 60 mm. to 80 mm. long Hawaiian Islands; 774 — 858 Metres) gigantea ; . cirrus segments; all the elements of the division series and both the brachials of the first pair carry keels '5i b1 28 arms; stout and robust, with large stout cirri which are more than half the length of the arms (Lesser Sunda Islands; 204 Metres). . . magna \y 15 — 22 (usually 20) arms; slender, with slender cirri which are considerably less than half the length of the arms (Malay Archipelago and the Philippine Islands; 54 — 502 Metres) annandalei 1. Oceanometra gigantea (A. H. Clark). A. H. CLARK. Proc. U.S. National Museum, vol. 34, 1908, p. 222 {Tlialassometra gigantea). 2. Oceanometra magna (A. H. Clark). A. H. Clark. Zool. Anzeiger, vol. 39, 1912, N° u/12, p. 425 [Tlialassometra magna). Stat. 251. 5°28'.4S., i32°o'.2E. Arafura Sea. 204 Metres. 1 Ex. The centrodorsal is conical, the sides slightly swollen, the tip truncated, 5.5 mm. broad at the base and 5 mm. high; the dorsal pole is about 1.5 mm. in diameter, approximately flat, covered with fine papillae; the cirrus sockets are arranged in ten columns, two to each radial area, usually four (rarely three or five) to a column ; on the outer side of each radial area the columns are closely crowded against the columns of adjacent radial areas, but in the midradial line they are separated by a bare, slightly concave, area which proximally is nearly or quite as broad as the adjacent cirrus sockets, but which rapidly becomes narrow so that the outermost one or two sockets in each area are in contact in the midradial line. Very deep, though very narrow, subradial clefts separate the centrodorsal from the radials. The cirri are XXX — XL, 66 — 74, 70 mm. to 85 min. long; the shorter cirri toward the apex of the centrodorsal are 60 mm. long with 59 segments. The first cirrus segment is very short, and the following slowly increase in length to the fifth, which is slightly more than twice as broad as long, and the seventh, which is about as long as broad; the eighth is a transition segment, nearly or quite twice as long as the distal diameter; the ninth is similar; the following slowly decrease in length to the twenty-second or twenty-third, which is about as long as its proximal diameter, and still further to those in the distal fifth of the cirri, which are twice as broad as long, and the terminal, which are still shorter. On the fifteenth or sixteenth the distal dorsal edge begins to project in the median line; on the succeeding segments this projection slowly increases in extent and, the middorsal line of the segments rising into a sharp keel, transforms on the short distal segments into the very high carinate dorsal spines charact- eristic of the genus. The last six or seven segments gradually decrease in diameter so that the penultimate segment is very small. The distal edges of the earlier segments, especially dorsally, are very finely spinous so that the cirri are rough to the touch. The ends of the basal rays are visible as dorsoventrally elongate tubercles bridging over the subradial clefts. The radials are very short, with a slight rounded median prominence and with a few small teeth on the distal margin. The IBrx are short, between four and five times as broad as long, broadly V-shaped in direct lateral view, with the proximal and distal edges parallel; the proximal and «.listal edges are slightl) everted; the former bears a few short irregularly placed spines <>n the margin; the latter bears on either side of the median line about eight regular teeth which begin one third <>f the distance trom the median line and gradually increase in ;h to the lateral corners; this row of teeth is continued inward toward the median line by sin. ill spines of decreasing size; the lateral edges are slightly produced and smooth; the antn the lateral portion of the dorsal surface of the Ilir,; .1 broad and low, almost obsolete, carination on the arms; arms 125 mm. long; cirri with 40 — 55 seg- ments, 40 mm. I outhern Japan; 664 — 720 Metres) . . aster lements of the division series and first two brachials perfectly smooth, without spines cirri with at least 1 gments lents of the division serie-, and first two brachials with narrowly prominent boniers and low narrow median kcels; arms 1 20111111. long; cirri with 5 5 — 60 segments (Hawaiian Islands; 245 .Metres) crassicirra elements of the division series and first two brachials without modified borders, and with 110 tracé of a median keel e1 about 50 cirrus segments iSt. Vincent, West In dies; [58 Metres) koek Ier i about. 70 cirrus segments (southern Japan; "deep water") cotlifera cirri with not more than 45 segments; division series strongly, but roundedly, carinate d1 cirri longer and more slender, 30 mm. long with 29 — 31 segments; carination of the division series broader; lower brachials with a broad median keel (Sa va de Mal ha; 243 Metres) . . . . gar diner i cirri shorter and stouter. 27 mm. long with 40 — 41 segments; carination of the division series narrower; lower brachials with a faintly indicated crest (Sa hul Bank; no depth recorded) . woodmasoni 1. Cosmiometra koehleri A. II. Clark. HARTLAUB. Memoirs Mus. Comp. Zool., vol. 27, 1012. N° 4. p. 360, pi. 3, figs 2. 4: pi. 14, figs. 5, 10 (Antedon duplex, part). 2. Cosmiometra cotlifera (llartla Hak ii. .\u;. Nova Acta dei Ksl. Leop.-Carol. deutschen Akad. der Xaturforsch., vol. 58, [891, X" 1. p. 70. pi. 4, fig. j.6; pi. 5, figs. 51, 56 Antedon conij Cosmiometra delieata A. 11. Clark. A. II. CLARK. Proc. U.S. National Museum, vol. $4, 1908, p. 225 [Thalassometra dein: \. Cosmiometr* icirra (A. 11. Clark'. A. II. Clark. Proc. U.S. National Museum, vol. 54, 1908, p. 225 (Thalassometra crassicirra). 5. Cosmiometra gardineri A. II. Clark. A. II. I P U.S. National Museum, vol. 40, 1911, p. 31 (Cosmiometra gardim Smithsonian Miscellaneous Coilections, vol. 61, 191 ;. \' 1 5, p. 43 (Cosmiometra gardineri). '55 6. Cosmiometra woodmasoni (Bell). BELL. Journ. Ltnn. Soc. (Zool.), vol. 24, 1S93, p. 340, pi. 23 {Antedon wood-masoni). A. H. Clark. Crinoids of the Indian Ocean, 191 2, p. 214 {Cosmiometra woodmasoni). Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 44 {Cosmiometra wood- masoni). 7. Cosmiometra aster (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 145 {Antedon aster). Proc. U.S. National Museum, vol. 34, 1908, p. 310 {Thalassometra aster); p. 3 1 1 {Tha- lassometra komaclü). 8. Cosmiometra philippinensis A. H. Clark. A. H. CLARK. Proc. U.S. National Museum, vol. 39, 191 1, p. 548 {Cosmiometra philippinensis). Zool. Anzeiger, vol. 39, 1912, N° 11/12, p. 427 {Cosmiometra helene). Stat. 95. 5°43'.5 N., ii9°4o'E. Sulu Archipelago. 522 Metres. r Ex. Stat. 253. 5°4S'.2S., 132° 13' E. Arafura Sea. 304 Metres. 1 Ex. Stat. 254. 5°4o'S., i32°26'E. Arafura Sea. 310 Metres. 1 Ex. From. Stat. 95 there is one young specimen with 13 arms 45 mm. long and the longest cirrus 2 1 mm. long with 40 segments. The example from Stat. 253, which I at iirst consiclered as representing a new species, helene, may be described as follows : The centrodorsal is moderate in size, truncated conical, about 4.5 mm. broad at the base and about 2.5 mm. high interradially. The cirrus sockets are arranged in ten columns of two or thfee each; interradially the columns are in close apposition, but in the midradial line they are separated by a wedge-shaped area, at hrst about as brpad as a cirrus socket, but with the converging sides coming together just beyond the last cirrus sockets, which is entirely covered with fine, more or less sharp, granulations. The dorsal pole is irregular, 2 mm. in diameter. The cirri are moderately stout, 2>7 mm- to 47 mm- 'on&i witn 52 — 61 segments of which the first four are very short, the fifth sligthly over twice as broad as long, the sixth, a transition segment, half again as long as broad, and the seventh slightly longer than the sixth ; the following gradually decrease in length, becoming about as long as broad on the thirteenth, twice as broad as long on the twentieth, and shorter distally ; dorsal processes begin on the thirteenth, gradually increasing in height; the dorsal spines are high, strongly carinate, Y-shaped in end view, the two distal edges finely serrate; at the tip of the cirrus they become narrower and smooth. The radials are entirely concealed; the IBrj are short, about four times as broad as the lateral length, slightly convex proximally, distally incised by a rounded process from the axillary so that the median length is only about two thirds of the lateral ; the proximal border is armed with very numerous fine short spines; the distal border is similarly modified, but the spines become more or less obsolete in the median third; the lateral borders are similarly modified, but the spines extend further imward over the dorsal surface of the ossicle and are more' i56 developed; the lateral thirds of the dorsal surfao of the IBr, are rather thicklj covered with fine short spines. Hie axillaries are rhombic, somewhat over twice as broad as long, with the al angles truncate; the lateral sides formed by the truhcation of the lateral angles] are only about one third as long as the sides of the IBr,; the proximal borders are modified like the corresponding borders of the IBr . the distal borders are very finely spinous; the lateral fourths of the dorsal surface are covered rather thickly with fine short spines Iike the lateral thirds of the (Br ; the svnarthrial tubercles are low, and only slightly marked; the division series are only slightly convex dorsally, sharply flattened laterally, and in very close apposition. The [IBr series are 2, the component ossicles resembling those of the IBr series, but the proximal and distal borders are more finely spinous, and the spinous modification of the lateral portion of the dorsal surface is relatively narrower exteriorly, and very narrow interiorly. The twenty arms are from 95 mm. to ioo mm. long; the spinous modification of the lateral portion of the dorsal surface of the ossicles of the division series runs up in a very narrow and progressively narrowing hand hoth internally and externally as far as the third or fourth brachial; the proximal oblong brachials have very slightly everted edges; as the brachials ime triangular serrate longitudinal striations appear, lirst only in the median line, but soon over the entire dorsal surface of the ossicles, which have slightly overlapping and spinous distal edge The specimen from* Stat. 254 is similar; there are 20 arms about 95 mm. long; the cirri are 35 mm. to 40 mm. long with 56 — 60 segments. Stylometra A. 11. (huk. The only species in this genus is the following: 1. Stylometra spinifera (P. H. Carpenter). 1'. II. Carpenter. Buil. Mus. Comp. Zool., vul. <>. 1881, N° 4, p. 158 (Antedon spinifera). VON GRAFF. Huil. Mn-. Comp. Zool., vol. 11, 1883, X' ~, p. 129 (Antedon spinifera). "Challenger" Reports. Myzostoma, 1884, pp. 14, 15, 19 (Antedon spinifera). 1'. II. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 370 (Antedon spinifera). A. II. ( ] VRK. Huil. du Mus. d'hist. nat.. Paris, i <_> i 1 . N" 4, p. 256 (Stylometra spinifera). — — Smithsonian Miscellaneous Collections, vol. 61 , [913, N° 15, p 43 (Stylometra spinifera). Stenometra A. II. ('luk. Kej to the Species of the Genus Stenometra. 'irri with 80 — 90 segments, about one quarter of the arm length; crest of the carination on the ossicles of tin- IBr series and the firsl two brachials rly or quite straight, without pronounced denticulations (Kei Islands; Me tres quinquecostata < irri with about rits segments only slightly longer than broad; profile ol the median keel on the elements of the IBr eries and first two brachials irregular and serrate (southern Japan; 91 ;o6 Metres) .... diadema 157 b2 longest cirrus segments twice as long as broad, or slightly longer; profile of the median keel on the elements of the IBr series and first tvvo brachials even, or nearly so (Philippine Islands; 210 Metres) . . cristata 1 . Stenometra quinquecostata (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 262, pi. 3, figs. 6, a — d; pi. 38, figs. 1 — 3 {Antedon quinquecostata). A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 44 {Stenometra quinquecostata). 2. Stenometra diadema (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 144 {Antedon diadema). — Proc. U.S. National Museum, vol. 34, 1908, p. 310 {Tlialassometra quinquecostata). - Vid. Med. fra den naturhist. Forening i Kobenhavn, 1909, p. 186 {Stenometra dorsata). 3. Stenometra cristata A. H. Clark. A. H. Clark. Proc. U.S. National Museum, vol. 39, 191 1, p. 553 {Stenometra cristata). Daidalometra A. H. Clark. Key to the Species of the Genus Daidalometra. a1 65-^-75 cirrus segments; cirri more than two thirds as long as the arms; carination of the ossicles of the division series and of the proximal brachials lovv and more or less blunted along the crest (sou t h west e r n Japan; 192 — 250 Metres) hana a2 51 — 65 cirrus segments; cirri less than half as long as the arms; carination of the ossicles of the IBr series and of the proximal brachials higher and sharper (Port Denison, Oueensland, to Ti mor and the southern Philppine Islands; o — 118 Metres) arachnoides 1. Daidalometra hana (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. n, 1907, p. 137 {Antedon hana). 2. Daidalometra arachnoides (A. H. Clark). A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, p. 402 {Stenometra arachnoides). Zool. Anzeiger, vol. 39, 1912, N" 11 12, p. 428 {Stenometra acuta). Stat. 166. 2°28'.5S., 131° 3. 3 E. Ceram Sea. 118 Metres. 4 Ex. Stat. 294. io°i2'.2S., I24°27'.3E. Timor Sea. 73 Metres. 6 Ex. .Of the specimens from Stat. 166 one has 10 arms and cirri with 54 segments; another has 13 arms about 60 mm. long and cirri with 49 — 54 segments, 20 mm. to 25 mm. long; the other two have 16 and 18 arms respectively. The largest example from Stat 294 has 12 arms about 60 mm, long; the cirri are XII, 51 — 58, 25 mm. long; the others are all small, with 10 arms. is8 Parametra A. II. Clark. Kej i" th< Species ol the Genus Parametra. .1 Arms evenl) rounded dorsally, the brachials, including the distal, entirely without a median elevation or carination, and with only very slightly produced edg( elements of the division series verj strongly convex dorsally, entirely without swollen or everted borders, their centres occupied by a very broad, low and obscure median swelling Hawaiian Islands; 345 634 Metres) .... fisheri .1 Brachials always with the mid-dorsal portion abruptly raised, forming a more or less evident carinate pro of the ossicles of the division series, which are only slightly convex dorsally, more or less raised or everted; a more or less developed notch is present between the outer portion ofte proximal borders of the axillaries . I brachials and the preceding ossibles, these notches, when the arms are in apposition, forming pon-s through which water reaches the sides of the disk b' the ossicles of the division series and the earlier brachials have strongly everted *es; the distal. or both, clements of the division series and the first brachial pair have a rounded and inconspicuous carinate process; the cirri have about 20 segments (Kei and Lesser Sunda Islands; 216 — 252 Metres) . . compr, 1. the "ssicles of the division series and the earlier brachials have moderately everted distal edges; the ossicles of the division series and the first two brachials are either smootli dorsally. or bear rounded and inconspicious carinate processes; more than 20 cirrus segments cl from 10 to iS (but very rarely more than [5) arms; ossicles of the division series usually entirely without median carination; sides of the division series usually quite smooth, buth the lateral borders of the ossicles of the IBr series may be crenulate, or mire or less tubercular (Hong Kong and 1 ormosa to southern Japan; 128 306 Metres) orion from [6 to 20 (usually from 17 to 20) arms; ossicles of the division series usually with a low and narrow median carination; sides of the division series usually with a more or less developed tubercular ornamentation lilippine Islands; [48—502 Metres) granulata 1. Parametra fisheri (A. II. Clark). .\. II. Clark. Proc. U.S. National Museum, vol. 34, [908, p. 223 [Thalassometra Jislt. 2. Parametra compressa I'. 11. Carpenter). P. II. Carpenter. "Challenger" Reports. Comatulae, [888, p. 222, pi. 41, [Antedon com- pressa, part). .\. II. Clark. Smithsonian Miscellaneous Collections, vol. 61, [913, X" 15. p. 45 {Parametra 159 Stat. 302. io°27'.9S., I23°28'7E. Timor Sea. 216 Metres. 1 Ex. The centrodorsal is discoidal, with a bare flat polar area 3.5 mm. in diameter. The cirri are XIV, 18 — 20, 23 mm. long; the first segment is very short, the following gradually increasing in length to the fourth, which is slightly broader than long, and the fifth- seventh, which are as long as, or very slightly longer than, broad; the eighth, a transition segment, is about half again as long as the median diameter; the ninth is about as long as the median diameter; the following gradually decrease in length so that the last three or four before the penultimate are about twice as broad as long; the distal dorsal edge of the eighth is thickened ; on the succeeding this soon becomes a thick rounded dorsal spine of the type characteristic of the genus. The ends of the basal rays are visible as small but prominent rounded tubercles in the angles of the calyx. The radials are concealed. - The IBr, are very short, about twice as long on the lateral border as in the median line, in lateral apposition for the basal two thirds but in the distal third diverging in nearly a straight line, extending well up in the angles of the calyx ; they bear a low blunt median carination. The IBr, (axillaries) are rhombic, twice as broad as long, the lateral angles in contact with those of their neighbors; the cutting away of the distal angles of the IBi^ forms large and conspicuous water pores just beneath the apposed angles of the axillaries; in the median line of the axillaries there is a low blunt median carination ; from the lateral angles a horizontal ridge runs inward for one third to one half of the distance to the median line, sometimes in the middle of the angle, sometimes toward the proximal side, where it branches, one branch curving downward and becoming a produced proximal border which runs to the median carination, the other branch running as a thickened rim along the distal faces of the axillary, or as a ridge just within the distal edges, sometimes meeting just proximal to the distal apex, but usually forming a broad curve beyond which is the apex. The IIBr series are 2; the proximal and distal edges of the elements of the IIBr series are moderately thickened and everted; there is a slight rounded median carination; the axillaries have thickened distal edges and produced proximal edges, the latter running in broad curve in the central part of the segment, in the lateral third or fourth running nearly or quite straight to the lateral angle, The edges of the first two brachials are modified like those of the elements of the IIBr series; there is a tracé of a median carination. Pj is 10 mm. to 12 mm. long with 17 — 21 segments which become about as long as broad on the sixth, and nearly twice as long as broad terminally; the pinnule is evenly tapering, rather strongly prismatic, and but little enlarged ; the second-fifth segments are sharp distally, though not distinctly carinate; the outer segments have the distal angles rather prominent, though not produced. P., is 6.5 mm. long with 12 segments, shorter, more slender, and slightly less tapering than Pj ; the pinnule is strongly and sharply prismatic,' the profile of the prismatic angle on the outer segments being sligthly convex; the distal segments have slightly prominent distal angles. P3 is 6 mm. long with 1 2 segments, similar to P., but tapering slightly more rapidly distally. The following pinnules resemble P... The distal pinnule are slender 9 mm. long with 17 segments. 3. Parametra granulata \ 11 Clark. 1'. ||. Carpi N "Challenger" Reports. ( omatulae, i888, p. 212 {Antedon compressa, part; specimen from Stal A. II. CLARK. Smithsonian Miscellaneous Collection rij I isue), vol. 52, 1908, part 2, p. tra compresi — Proc. U.S. X. ai. mi. il Museum, vol. 36, 1909, p. 406 Parametra compressa). — Proc. U.S. National Museum, vol. 39, 1911, p. 554 [Parametra compressa). Smithsonian Miscellaneous Collections, vol. 1.1. 1913, X" 15, p. 45 [Parametra granulata). Stal N [2i 19 E. Sulu Sea. 275 Metres. 1 Ex. This small specimen lias 10 arms about 35 mm. long; this cirri have 15 segments of which the fourth is a transition segment. 4. Parametra orion (A. H. Clark). A. 11. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 143 {Antedon orion). Proc. U.S. National Museum, vol. 34, 1908, p. 310 {Thalassometra orion). Proc. U.S. National Museum, vol. 39, 1911, p. 554 {Parametra orion). Lissometra A. II. Clark. The only species in this genus is the following : 1. Lissovictra albojlava A. 11. Clark). A. II. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 145 \Antedon air. Horaeometra A. 11. Clark. The only species in this genus is the following: 1. Horaeometra duplex \\' . 11. Carpenter). VON GRAFF. Huil. Mus. Comp. Zool., vol. 11, 1SS3, X" 7, p. 133 {Antedon duph "Challenger" Reports. Myzostoma, 1884, PP- '/• ItS {Antedon duplex). 1'. II. CARPENTER. "Challenger" Reports. Comatulae, 1888, pp. 207, 212 {Antedon duph Hartlaub. Mem. Mus. Comp. Zool., vol. 24. [912, N° 4, p. 366 [part), pi. 3, figs. 6— 11 (but not 2, 4, 5); pi. 14, fig. 13 (but not 5 di\-\ io) {Antedon duplex). Stiremetra A. 1 1. < ilark. Key to the Species of the Genus Stiremetra. Longest proximal cirrus segments only very slightly longer than broad; all the cirrus segment /ery shorl basal bear very prominent dorsal spines 1 Jarkson, New South Wales; [710 Metres) spinicirra I proximal cirru '-nis at least tuier as Ion- :,s broad; dorsal spines fined to tin- shorter distal segments h 1 irsal large and columnar, the two columns of cirrus so.-kets in each eparated interiorly by a broad V-shaped furrow as wide as the iói adjacent cirrus sockets; 50 — 64 (usually 57 — 58) cirrus segments; the four to seven cirrus segments after the twenty-third have"a shallow rounded notch in the dorsal carination so that they appear to bear two spines, a proximal and a distal (Laccadive Sea; 774 Metres) air i ui f era \y centrodorsal hemispherical or truncated conical, the ten columns of cirrus sockets in close lateral apposition c1 axillaries longer than broad, their posterior processes in lateral view almost bisecting the IBr, (Fiji; 2430 Metres) acutiradia c3 axillaries markedly broader than long d1 40 — 50 cirrus segments (Kermadec Islands and Fiji; 11 34 — 2430 Metres) .* breviradia d2 62 — 66 cirrus segments (Moluccas; 1 158 Metres) perplexa 1. Stiremctra spinicirra (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 188S, p. 112, pi. 11, figs. 1, 2 {Antedon spinicirra). A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 44 (Stiremctra spinicirra). 2. Stiremetra carinifera A. H. Clark. A. H. CLARK. Crinoids of the Indian Ocean, 1912, p. 211 (Stiremctra carinifera). 3. Stiremctra acutiradia (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 113, pi. ir, figs. 3, 4 (Antedon acutiradia). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N" 15, p. 45 (Stiremetra acutiradia). 4. Stiremctra breviradia (P. H. Carpenter). VON Grakf. Buil. Mus. Comp. Zool., vol. 11, 1883, N° 7, p. 133 (Antedon radiospind). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 1 10, pi. 3, figs. 4, 5; pi. 11, fig. 5; pi. 19; pi. 20, figs. 1, 2 (Antedon breviradia); pi. 3, figs. 4, a — c (Antedon radio- spind); pi. 3, fig. 5 (Antedon eversa). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 19 13, N° 15, p. 45 [Stiremctra breviradia). 5. Stiremetra perplexa (A. H. Clark). A. H. Cl.ARK. Zool. Anzeiger, vol. 39, 1912, N" ti/i2, p. 426 (Tlialassometra perplexa). Stat. 2ii. 5°4o'.7S., i20°45'.5E. Banda Sea. 1158 Metres. 1 Ex. The centrodorsal is small, truncated conical, the dorsal pole entirely covered with elongate tubercles or papillae; the cirrus sockets are arranged in ten closely crowded columns of two or three (usually two) each. SIBOGA-EXPEDITIE XLII K 21 rÓ2 The firn are XVIII, ;: mm to [.o mm. long; the longest cirrus segment usually the sixth is trom two and one half to three times as long as broad; the following slowly decrease in length, in the middle of the cirri being about as long as broad, or slightly broader than long, and in the terminal fourth or fifth twice as broad as long; the longer proximal segments have a slight median constriction and slightly produced distal edges; the short distal segments have a prominent median keel which, instcad of being sharp along the crest, is broadly rounded. This keel begins as a production of the distal dorsal border of the segment, but soon involves tin- entire dorsal surface becoming, in profile view, rounded triangular, the apex near the distal end, then evenly rounded, and in the terminal portion more or less straight along the crest. The ends of the basal rays and the radials are concealed, the IBr, abutting directly upon the centrodorsal though nowhere touching it, being separated from it by narrow sub- radial clefts. The 1 1 > r . are very narrow and band-like, trom six to eisfht times as broad as longT: verywhere of the same width, luit while the outer surface of their lateral portions is parallel to the axis of the IBr series, their median portion is recumbent. making an angle of nearly 90 with that axis, so that in direct lateral view they are only about one third as high in the median line as laterally. The axillaries are rhombic, with produced and broadly truncated lateral angles, half again as long as broad; the lateral edges are about as long as those of the IBr,; the distal anti proximal sides are strongly concave; a posterior process, about as high as the anterior angle but somewhat broader and more rounded, incises the IBrr The proximal two thirds of the median portion of the axillaries rises into a prominent, but well rounded, median elevation. The ossicles of the IBr series are very sharply flattened against their neighbors, this flattening persisting as far as the base of 1',. The first brachial is short, deeply incised by the second ; the outer length is much greater than the inner, and more than twice the median, the distal border being strongly concave The second brachial is irregularly quadrate, with a strong posterior process incising the first; the proximal three fourths of the median line is elevated, as in the axillary. The third brachial is oblong, very short, about five times as broad as long. All of the arms are this point. I', is 5.5 mm. long, compósed of [9 segments of which the first eight are much larger, but proportionately shorter, than those succeeding; the second-seventh have thin very high carinate pn> vhich reach a maximum on die fourth thence rapidly decreasing in heighth distally; after the eighth segments the pinnule is relatively slender, and tapers gradually to the ti|>. In lateral view the pinnule appears enormously swollen in the proximal three fifths Mirst eight segments), the swelling reaching a maximum on the fourth segment and decreasing rapidly distally; bevond the eighth segment the pinnule is slender and evenly tapering, compósed of segments most of which are about as long as broad, with numerous spinules along prismatic ridgi i6- Aglaometra A. H. Clark. Key to the Species of the Genus Aglaometra. a1 Cirri relatively slender, less than half as long as the arms b1 stouter and more rebust; the edges of the segments of the IBr series and of the earlier brachials are but very slightly if at all everted, and are armed with exceedingly fine spines, or are quite smooth ; arms about 130 mm. long; cirri 60 mm. long, with 62 — 69 segments (Moluccas; 567 Metres) . . vera b3 more slender; the edges of the segments of the IBr series and of the earlier brachials are more strongly everted, and more prominently spinous; arms 130 mm. long; cirri more slender than in the preceding, 45 mm. to the 55 mm. long, with 59 — 64 segments (Philippine Islands; 612 — 945 Metres). . propiuqua a2 Cirri long and stout, more than half as long as the arms b1 large and conspicuous water pores are present, formed by the cutting away of the distal angles of the IBrn and of the first brachials both interiorly and exteriorly, and the inner distal angle of the third brachial (the hypozygal of the first syzygial pair); arms 125 mm. long; cirri 60 mm. to 65 mm. long, with 63 — 64 segments (extreme western end of New Guinea; 798 Metres) stilcata b2 no water pores ; base of animal (IBr series and arm bases) more compact c1 radials large and conspicuous, more than half as high as the IB^, the plane of their outer surface everywhere nearly parallel with the dorsoventral axis, forming a band of equal height all around the calyx between the centrodorsal and the lBrx; .no subradial clefts ; a prominent broad low rounded tubercle near the lateral borders of the axillaries; arms 150 mm. long; cirri X — XX, 66, 90 mm. long (Philippine Islands; 889 Metres) eupcdata c3 radials entirely, or mostly, concealed, their central portion recumbent, making a very large angle with the dorsoventral axis, never forming a regular and uniform band between the centrodorsal and the IBrx; con- spicuous subradial clefts are present; no tubercles on the dorsal surface of the axillaries d1 larger and stouter, with longer and stouter cirri ; borders of the ossicles of the IBr series and the lower brachials everted and "fringed with strong spines;" arms 100 mm. long; cirri 80 mm. long with 65 segments (Meangis Islands and Moluccas; 900 — 1264 Metres). . . . valida d2 smaller and more slender, with shorter and relatively more slender cirri; borders of the ossicles of the IBr series and the lower brachials smooth, or nearly so ; arms 90 mm. long; cirri 50 mm. long with 70 segments (Kermadec Islands; 11 34 Metres) incerta i. Aglaometra eupedata i.\ 11. Clark A. II. Clark. Proc. U S National Museum, vol. 36, 1909, ]>. 404 [CrotalomeJra eupeda 2 Aglaometra sulcata (A. II. Clark A. II. Clark. Zool. Anzeiger, vol. ;■.. 1912, X" 11 12. |>. 427 [Crotalometra sulcata). St.it. 161. 1 k>.;S-. 1; >» I . Halmahera Sea. 798 Metres. 1 Ex. rhe general structure of this species resembles that of A. propinquay but the cirri are proportionately larger, longer and more robust, 60 mm. to 65 mm. long with 63 — 64 segments, and the ossicles of the IBr series and lower brachials are almost smooth, as in . /. vera. It differs markedly from both of these in having the distal angles of the IBr, and the proximal angles of the axillaries, and the corresponding angles of the first two brachials anti of the elements "t" the first syzygial pair. widely cut awav, torming large and prominent rhombic water I he of the ossicles bordering these water pores are more or less everted and coarsely denticulate, or bear a few coarse spines. 3. Aglaometra valida (P. II. Carpenter). 1'. 11. Carpenter. "Challenger" Reports. Comatulae, [888, p. 104, pi. 15, figs. 5 — % (Antedon valida . A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 6l, 1913, N° 15, p. 47 [Aglaometra valida). tt. 122. i°58.'5Nv i25°o'.5l;.. Celebes Sca. 1264—1165 Metres. 4 Ex. '1 he dorsal pole of the centrodorsal is more blunted than in Carpenter's specimens, and is studded with numerous small low tubercles. The cirrus sockets are in ten columns which interradially in apposition, but well separated in the midradial line: there is usually only a single functional socket to a column; the more distal obsolete cirrus sockets develop conical .tubercles ol which the axes are parallel to the dorsoventral axis of the animal : these tubercles are proportionate to ti of the cirrus socket which they occupy; thus below the functional socket in the columns there is a doublé row in each radial area of tubercles of diminishing si/c which continues to the dorsal pole, there merging with the small polar tubercles. rhere are three cirri remaining contain 45 (om and 6] two) segments; in the first the transition segment is the ninth, in the two others the ei^hth. The cirri decrease slightly in diameter to the transition segment, and in lateral view increase in diameter on the short distal lents. The Iongest cirrus segment (the transition segment) is about twice as long as broad. The radials are visible as short and broad. more or less irregular, tubercles between the centrodorsal and the ll>r,; one or two tubercles springing from them are visible in the • t the cal) the ends of the basal rays, and there may be a smaller tubercle .mkI the central tubercle. The central tubercle is indicated in Carpenter's fisfure, but is not clearly shown pi. 15. fig The ends of the basal rays are visible as small low rhombic tubercles in the angles of ió5 the calyx, more or less obscured by the tubercles arising from the radials above them, and the cirri beneath. The proximal border of the IBi'j is turned outward and more or less scalloped ; the median third of this border is straight and parallel with the proximal border of the centrodorsal ; the lateral thirds slant outward and upward, and are slightly concave; the edge of this eversion is thickened and smooth; the lateral portions of the distal border of the IBrx are also everted, but not nearly so prominently as the proximal border. The IBrj is very slightly longer than in the "Challenger" specimens, and the distal border is not quite so inuch incised ; this undoubtedly is due to the smaller size of these individuals. The axillaries are not quite twice as broa d as long i the proximal edge is slightly straighter than in the "Challenger" specimens, and is slightly everted; the lateral borders of the elements of the IBr series and of the first brachial and the inner borders of the first two brachials are laterally produced. Pj is greatly enlarged with 12 or 13 segments of which the first eight or nine are sharply flattened on the outside, the ventral border being somewhat produced ; the second and third segments are strongly carinate on the inner ventral border, especially the third, but from this point the carination rapidly diminishes in extent, disappearing three or four segments further on ; on the second segment this carination is parallel to the dorsoventral plane. but it gradually becomes recumbent so that on the fourth it is at right angles to this plane. The brachials bevond the tenth are triangular, about as long as broad, with very finely spinous distal margins; the dorsal line of the arms is smooth in profile. 4. Aglaometra vera (A. H. Clark). A. H. Clark. Zool. Anzeiger, vol. 39, 1912, N° 11 '12, p. 427 {Crotalometra vera). Stat. 173. 3°27'.oS., i3i°o'.5 E. Ceiam Sea. 567 Metres. 2 Ex. This species is closely related to A. propinqua-, the edges of the segments of the IBr series and of thé earlier brachials are but very slightly-, if at all, everted, and are armed with exceedingly fine spines or are quite smooth ; the spines within the distal angle of the axillary and on the dorsal surface of the ossicles are exceedingly short and fine and difficult to detect. The larger has 10 arms , abeut 130 mm. long; the cirri are 60 mm. long and are composed of 62 — 69 segments of which the longest are from third to one half again as long as broad; the sixth or seventh is a transition segment. 5. Aglaometra propinqua (A. H. Clark). A. H. CLARK. Proc. U.S. National Museum, vol. 39, 191 1, p. 549 {Crotalometra propinqua). 6. Aglaometra ineerta (P. H. Carpenter). P. H. Cari'ENTER. "Challenger*' Reports. Comatulae, 1888, p. 106, pi. 8, figs. 4, 5 {Antedon ineerta). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, X" 15, p. 47 {Aglaometra ineerta). [66 Thalassometra A. II. ( lark. Kej l ■ the Species of the Genus Thalassometra. i Eighth and following branchials with two or three long curved spines near the distal edge, whicl ne very prominent in the outer portions of the arms; margins of the ossicles of tin- IBr series and lower brachials frinered with very prominent bluiu spines; radials, elements of the IBr series and first two brachials with a rounded and spinous centre raised above the lateral portions; io arms, 50 mm. long; cirri about XXV, 30 — 35(Crozel [slands 2926 Metres) öispinosa' a Without two or tliree long curved spines near the distal edge of tin- brachials, which have more or less overlapping and finely spinous distal edges; rarely the centra] ])ortion of the laterally compressed outer brachials may be produced into a single broad, dorsoventrally flattened median overlapping spine 1)' not more than 30 cirrns segments; cirrus sockets irregularly place d on ,i hemispherical centrodorsal in one irregular row "f 15, and an irregular |>artial second row c' very numerous smal! spines on the ossicles of the division series and arm bases; cirri about XX, 25 — 30; 10 — 12 arms about 50 mm. long; IIBr series 4 (3 + 4) (near A se en si on I si and, south Atlantic; 756 Me tres) multispina dorsal surface of the ossicles of the division series and arm bases with very few or no spines d1 cirri XX, 25; ossides of the IBr series and first two brachials with sharp straight edges fringed with spines, and a \'v\v spines on the dorsal surface; brachials smooth, without prominent distal ends; segments of 1', with tufts of small spines along the distal border; 10 arms 30 mm. to 35 mm. long Ivermadec Islands; 1 1 34 Metres) echinata d cirri X, 21; ossicles of the IBr series and first two brachials with no spines 011 the dorsal surface; brachials with prominent distal boniers bearing very fine spines; segments of I', with a few very fine spinules; to arms probably about 35 mm. long; Canary Islands; 1 , Metres) omissa b at least 34 (from 34 to rru » se ^ments cirri arranged, more or less regularly, in 15 crowded columns, three in each radial area <>i 1 trodorsal; the radial areas of the centro- dorsal are not differentia d r\ large; arm-, 175 mm. long; ossirles of the [Br series and achials as far as the ond syzygy fringed on the proximal and 1 67 distal borders with very prominent short blunt thorns, but without spines on the clorsal surface; cirri XV — XXII, "etwas über 60", about 40 mm. long; 10 — 12 arms which, with the division series, are narrow and very strongly and evenly rounded dorsally ; IIBr series 2 (Galapagos Islands to Panama; 588 — 1407 Metres) d2 size medium; arms 60 mm. to 95 mm. long; the ossicles of the division series and the lower brachials are not bordered with very prominent short blunt thorns e1 ossicles of the division series and four or five lowest brachials thickly beset with very numerous fine hair-like spines ; division series and arms narrow and very strongly rounded dorsally, only slightly flattened against their neighbors; cirri XL — XLV, 50, 33 mm. long; 10 — 11 arms 95 mm. long; IIBr series 2 (western Bering Sea; 1883 Metres) villosa e'2 dorsal surface of the ossicles of the division series and lower brachials nearly or quite devoid of spines; division series and arm bases broad, very slightly convex dorsally, broadly and sharply flattened against their neighbors f1 ossicles of the IBr series and first two brachials slightly carinate and more or less fringed with small spines ; a few spines on the dorsal surface of the segments, particularly on the lovv rounded median keel; cirri XX, 50 — 55, 30 mm. long; 10 arms 60 mm. long (Mean gi s Islands; 900 Metres) pergracilis f2 ossicles of the IBr series and first two brachials swollen in the centre, but not carinate, and without spines; cirri XII — XV, 50, 30 mm. long; 10 — 12 arms 60 mm. long (Portugal to the Canary Islands-, 900 — 2165 Metres). . . . lusitanica c2 cirri arranged in 10 definite columns, two in each radial area of the centrodorsal ; the radial areas of the centrodorsal are well differentiated d' 34 — 46 cirrus segments; 10 arms only e1 IBrj with the distal edge prominently everted and with about six or eight irregular dentations which have numerous fine spines at their tips; axillaries with the proximal edge like the distal edge of the. IBrx, and the distal edge with a more regular finely spinous margin; cirri XX, 34 — 46, 40 mm. long (Mal- dive Islands; 378 Metres) marginata e3 no eversion of the borders of the ossicles of the IBr series, or of the first two brachials, which are not carinate, but are uniformly beset with very fine spines; basal portion of the animal constricted; cirri XX, about 40 ; arms 40 mm. long (southern Japan; 621 Metres) latipinna [68 i -71 cirrus segments ossicles of the IBr series and first two brachials without spines cm the dorsal surface or on the proximal or distal borders, smooth rsally, or with a few low inconspicuous tubercles, usually with spinous lateral borders; third and following brachials with the dorsal surface studded with very fine shorl spines or arp tubercles; cirri XX. 62—71, verj slender, 50 mm. long; -13 ver) slender arms 80 mm. to 90 mm. long; IIBr \ 5 1 south of Kurrachi, India; [377 Metres) ossicles of the division series and the firsl two brachials with verv prominent spines on the proximal and distal borders and. to a greater or lesser extent, on the dorsal surface f spines on the borders of the ossicles of the division series few, large and coarse, those along the proximal edges of the axillaries especially long. and slightly curved dorsalward; no spines on the dorsal surface of these segments except for a few in the centre of the IBr, and first brachial, and a line of short spines or tubercles down the centre of the axillaries; outer portion of the arms compressed laterally, the central portion of the distal border of each brachial abruptly produced into a broad dorsoventrally flattened overlapping spine: cirri XX. 50 — 55, 32 mm. long; 10 — 12 arms 1 10 mm. long; Il Br 4 (3 + 4) (Hawaiian Islands; 632 Me tres) f3 spines on the borders of the ossicles of the division series and first two brachials finer and much more numerous; the central portion of the distal edge of the outer brachials is not abruptly produced 1 few coarse spines on the dorsal surface of the ossicles of the IBr series and firsl t\\o brachials; these segments have the proximal and distal edges everted and abundantly armed with very fine spines, and a more coarsely spinous median carination h1 lareer an 1 stouter, with more numerous cirrus segments; arms 100 mm. long; cirri XV— XXV, 54 — 66, 30 mm. to 50 mm. long Philippine Islands to Timor; attcnuata hawaüensis hirsuta 2 1 1 - -883 Metres h smaller and more slender, with fewer cirrus segments; arms 80 mm. long; cirri XXV, 50 --55. 3" mm. long luth western Japan; 792 Vletres) puóescens numerous s] 5 distributed over the dorsal surface of the 1 of tli-- IBr series and the first two brachials, 169 including the more broadly rounded median keel, which grade insensibly into those on the slightly everted borders of these segments (Postillon Islands; 794 Met r es), margaritifera 1. Thalassometra margaritifera A. H. Clark. A. H. Clark. Zool. Anzeiger, vol. 39, 1912, N° 11 12, p. 426 [Tlialassomctra margaritifera). Stat. 45. 7°24'S., iiS°I5'.2E. Flores Sea. 794 Metres. 2 Ex. This species is very closely related to Th. hirsuta; the eversion of the proximal and distal edges of the ossicles of the IBr series and of the first tvvo brachials is less marked than in Th. hirsuta and the spinosity is coarser, the spines being more uniform in size and more thickly distributed over the- dorsal surface of the segments; they are also longer, so that there is less difference between the spines of the dorsal surface and those of the everted edges; the median carination is more rounded than that of Th. hirsuta, and is studded with spines resembling those of the general dorsal surface. The cirri are about 45 mm. long, with somewhat more that 57 segments: the arms are about 95 mm. long, in hirsuta being 95 mm. to 100 mm. long. 2. Thalassometra hirsuta A. H. Clark. A. H. Clark. Proc. U.S. National Museum, vol. 39, 191 1, p. 552 [Tlialassometra hirsuta). Stat. 85. o°3Ó'.5S., ii9°29'.5E. Makassar Straits. 724 Metres. 7 Ex. Stat. 286. 8°5o'.2S., I27°2.2E. Timor Sea. 883 Metres. 1 Ex. A specimen from Stat. 85 may be described as follows : The centrodorsal is small, low, rounded conical ; the dorsal pole is thickly studded with small more or less sharpened papillae; the cirrus sockets are arranged in ten columns, closely crowded, of two sockets each . The cirri are XX, 60—64, 40 mm. to 45 mm. long; the longest proximal cirrus segments are from two and one half to three times as long as broad; the eversion of the distal edo-es of the segments begins on the fith or sixth. The dorsal surface of the ossicles of the IBr series and of the first two brachials is uniformly and rather thickly covered with short fine spines; their proximal and distal edges are everted and armed with very numerous fine spines which are more closely set and longer than those on the dorsal surface; the IBrj ancl the proximal half of the median line of the axillary bears a moderately sharp, though low, median keel which is studded with slender spines ; more or less complete reduplications of this keel occur on the first two brachials; beyond the first syzygy the spines become finer, shorter, mor-e thickly set, ancl more evenly distributed, as the ends of the brachials become oblique gradually giving way the finely serrate longitudinal striations. The base of the animal is moderately compact, the outer edges of the ossicles of the IBr series and lower brachials being straight and in close apposition. Rather small water pores are present. SIBOGA-EXPEDITIE XLII b. 22 rhe specimen from Stat 286 is slightly smaller and more slender than the preceding, with the spinosity of the IBr series and firsl two brachials very slightly finer and thicker. The arms are 80 mm. long; the cirri are 27 mm. long with 44 51 segments. Thalassometra pubescens (A. II Clark). A. II. ( 1 \i,l. Proc. U.S. National Museum, vol. 33, p. 139 [Antedon pubescens). 4. Thaiassometra marginata A. 11. Clark. .\. II. Clark. Crinoids of the Indian Ocean, i>;i2, p. 206 {Thalassometra marginata). Thalassometra pergracilis A. 11. Clark. P. II. CARPENTER. "Challenger" Reports. Comatulae, 18S8, p. 107, pi. 12, figs. 3—5; pi. 15, figs. 1 — 4 {Ante Jon gracilis). A. H. CLARK. Smithsoniun Miscellaneous Collections (Quarterly Issue), vol. 50, part 3, 1907, p. 360 ( Thalassometra pergroi il Crinoids of the Indian Ocean, 1912, p. 207 {Thalassometra pergracilis; references, but not the specimen recorded). I am now convinced that the specimen from the Andaman Islands in about 4S5 fathoms of water which I recorded as Thalassometra pergracilis does not in reality represent that species. It is in too poor condition for definite determination. 6. Thalassometra hawaiiensis (A. II. Clark). A. II. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 132 {Antedon haivaiiensis). Proc. U.S. National Museum, vol. 34, 1908, p. 222 {T/ialassonntra hawaiiensis). 7. Thalassometra agassizii (Hartlaub). HARTLAUB. Huil. Mus. Comp. Zool., vol. 28, 1895, N" 4, p. 131, pi. 1, figs. 4, 7, 8; pi. 2, [8, 19; pi. 3, fig. 23 {Antedon ■/). s. Thalassometra bispiuosa (F. H. Carpenter). 1'. II. Carpenter. "Challenger" Reports. Comatulae, 18S8, p. 115, pi. 20, figs. 3, 4 {Antedon bispiuosa). \. II. CLARK. Die Crinoiden der Antarktis, 1915. p. 112 {Thalassometra bispiuosa). Thalassometra villosa (A. II. Clark A. II. Cl. ARK. Proc. U.S. National Museum, vol. 33, 1907, p. 138 {Antedon villosa). 10. Thalassometra latipinna d'. 11. Carpenter). 1'. II. Carpenter. "Challenger" Reports. Comatulae, 18S8, p. 116, pi. 10, fig. 3 {Antedon latipinna). A. II. Clark. Smithsonian Mi < ollections, vol. 61, [91 ;, N° 15. p. 46 {Thalasso- metra la ti pp 171 ii. Thalassometra echinata (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 119, pi. 21, figs. 4, 5 {Antedon echinata). A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1915, N'1 15, p. 46 {Thalasso- tnetra echinata). [2. Thalassometra multispina (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 248, pi. 13, figs. 1 — 3; pi. 14, figs. 5 — 7; pi. 50, figs. 3 — 6; pi. 69, figs. 1 — 4 {Antedon multispina). A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 19 13, Nn 1, p. 47. 13. Thalassometra omissa (Koehler). KüEHLER. Échinodermes provenant des campagnes du yacht "Princesse-Alice", 1909, p. 268, pl- 33> fig- I0 {Aitedon omissa). 14. Thalassometra attenuata A. H. Clark. A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 147 {Thalassometra attenuata). Crinoids of the Indian Ocean, 19 12, p. 204, fig. 38, p. 205 {Thalassometra attenuata). 15. Thalassometra lusitanica (P. H. Carpenter). P. H. CARPENTER, Proc. Roy. Soc. Edinburgh, vol. 12, 1884, p. 368 {Antedon lusitanica). "Challenger" Reports. Comatulae, 1888, p. 109, pi. 39, figs. 1 — 3 {Antedon lusitanica). Journ. Linn. Soc. (Zool.), vol. 24, 1892, p. 65 {Antedon lusitanica). Koehler. Échinodermes provenant des campagnes du yacht "Princesse-Alice", 1909, p. 267, pi. 1, figs. 7, 8; pi. 32, figs. 12 — 14 {Antedon lusitanica). et Vaney. Buil. du Mus. d'hist. nat., Paris, 1910, N" 1, p. 31 {Antedon [Crotalometra] lusitanica). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 191 3, N° 15, p. 46 {Thalasso- metra lusitanica). X. Family Charitometridae A. H. Clark. Key to the Genera of the Family Charitometridae. a1 Proximal pinnules over twice as long as the very short middle and distal pinnules, and strongly carinate; arms usually from 20 to 30 in number; IIBr series 4(3-1-4) or 2, or both in the same individual; IIIBr series 2(1 + 2), internally developed; ossicles of the division series and lower brachials usually with a more or less complex and highly, developed tuber- cular ornamentation, though sometimes plain (West In dies; 121 — 720 Metres) Crinometra a3 Proximal pinnules much less than twice as long as the middle and distal pinnules, usually only slightly, or not at all, longer bl small (arm length less than 60 mm., rarely over 45 mm.), with not more tlum 12 cirrus segments; the division series usually make :i large angle with the dorsoventral axis so tli.it the lower part of the anima! is broad and rounded; from three to six of the segments of the genital pinnules are greatlj expanded, forming a rooi over the gonads; io arms (Kei Islands and the Molucca Sea to southwestern Japan; Metres) Strotometra :r, with at least 15 cirrus segments; the division series usually make a relatively smal! angle with the dorsoventral axis so that lower part the animal is more or Iess narrow the ossicles of the division series and earlier brachials are relatively narrow and well separated from their neighbors laterally, but the gap between them is more or less completely bridged by a thin flan like lateral production of the dorsolateral borders of the ossicles as for as the fourth or lil'th brachials; from three to five of the segments of the genital pinnules are greatly expanded, roofing over the gonads : 10 arms trom 100 mm. to iiomm. long (Meangis Islands and southwestern Japan; 650 — 900 Metres) Poecilometra the ossicles of the division series and lower brachials are in close apposition, and are sharply flattened against their neighbors d1 genital pinnules abruptly expanded, the third and fourth segments broad and nearly flat on the outer side, but the tl ft h smaller; IBr series and arm bases diverging at a relatively small angle so that the lower part of the animal appears bluntly conical ; 10 arms 90 mm. to 100 mm. long (K er mede c Islands and Fiji; 1134 — 2430 Metres) Charitometra d2 genital pinnules usually only slightly expanded the expansion always involving a number of segments and always tapering away ■\ distally e1 arms stout at the base, becoming strongly compressed laterally in the outer portion; the mid-dorsal line of each brachial is elevated into a broad, high, blunt overlapping spine or tubercle; the ossicl division series and the first two brachials have the centra] portion elevated so that their dorsal surface is in the shape of a broadly V-shaped gable; the cirrus sockets are arranged in one irregular, or two regular, columns in each radial area; cirri X\' — XXX, 1S — 28, varying from short to very long; io arms trom 75 mm. to 2 11 mm. in length (Ti mor to the Meangis and Philippine Islands; 520 — 1 3 1 4 Metres) Chondrometra outer portion of the arms not compressed laterally; the mid- irsal line of the outer brachials may be evenly rounded, or / o Glyptometra may bear a low, blunt or- sharp, carinate ridge which, however, is never elevatecl into au overlapping spine or tubercle f1 a low sharp median keel of uniform height on the ossicles of the division series and all, or nearlv all, of the brachials; ossicles of the division series and earlier brachials with abruptly everted borders and more or less numerous small tubercles or capitate spines scattered over the dorsal surface; 10 — iS (usually 10 — 12) arms 100 mm. to 140 mm. long; IIBr 2 or 4(3 + 4); cirri XV — XX, 13 — 15 (Philippine Islands; 92 — 761 Metres) f3 dorsal surface of the ossicles of the division series and brachials evenly rounded, or with a blunt median carination, or a broad low median tubercle, never with a low sharp median keel ; proximal and distal borders of the ossicles of the division series and of the lower brachials never everted and standing up at right angles to the general surface of the segments; no definite isolated small tubercles or capitate spines on the dorsal surface of the ossicles of the division series or earlier brachials, which are dorsally evenly rounded, irregularly rugose, or bluntly carinate g1 centrodorsal more or less conical, with the cirrus sockets arranged in ten definite columns, two in each radial area h1 26 — 3 3 arms; IIBr series always 4 (3 + 4) (Kei Islands to the Malay Archipelago, the Philippine Is- lands and southern Japan; 54 — 403 Metres) Crossometra Ir not more than 20 (usually 10 — 20) arms; IIBr series, when present, usually 4 (3 + 4), sometimes 2 (Lac- cadive Islands to Timor and the Kei Is- lands, and northward to the Philippines and southern Japan; j $ — 1269 Metres) g" centrodorsal thick discoidal or more or less columnar, the cirrus sockets arranged in 1 5 crowded columns h1 12 — 28 arms i1 all division series 2 ; extremely brittle and easily broken at the synarthries; 15 — 19 arms; cirri XXX, 19 (Moluccas and Philippine Islands; Perissometra 118 — 243 Metres) Monachometra i3 IIBr series 4 (3 + 4); tough, the arms, rarely broken at the base during capture ; 14 — 28 arms; cirri XX — XXX, 15 — 24 (South Africa to the Phi- lippine Islands and Fiji; 360 — 13 14 Metres) Pachylometra '71 io or 11 enk exceptionally more than 10) arms; lll'.r series, if present, 2 i' large; proximal portion of anima] very broad and well rounded, the profile of the division series and arm bases strongly convex; ossicles of the division series and arm bases with the lateral borders strongly, the proximal and distal less strongly, everted, un- modified, finely tubercular, or crenulate, and with a narrow blunt median keel; brachials usually each with a prominent, though low, small rounded median tubercle which beyond the middle of the arm gradu- ally becomes obsolete; cirrus segments slightly constricted centrally, with prominent ends; stout with 10 (exceptionally 11) arms 160 mm. to 1S0 mm. Ion-; cirri about XXX, 15 — 21 (usually 16 — 19) (Hawaiian Islands; 574— Si 2 Metres) . . . i small: proximal portion of animal narrow, the profile of the division series and arm bases diverging, in approximately a straight line, at a relatively small aiKde with the dorsoventral axis; dorsal surface of the division series and tïrst four brachials rising evenly, and rather steeply into a low and very blunt median keel, which becomes obsolete in the outer half of the arms; cirrus segments with un- moditïed proximal and distal borders; slender, with 11 arms <>; mm. long; cirri XV, 16, 20 mm. long (sou t h west e r n Ja pa n ; 171 Metres) Calyptometra Chlorometra Crossometra A. II. Clark. Key to the Species of the Genus Crossometra. imal portion of the animal appearing narrow, the profile of the division series in lateral view nearlj straight, making an angle of about 450 with the dorsoventral axis. or an angle of about 900 with each other; 29- -32 arms [50 mm. long; cirri XXV XL, 23 2'», 30 mm. to 40 mm. long (Timor to the Malay Archipelago and the Philippine Islands; 54_:;,, Metres) investigatoris imal portion of the animal very broad and well rounded listal cirrus segments about as Ion- ,,s their distal diameter, with the mid-dorsal line sharpened, bul nol produced; division series evenly rounded dorsally, with no tracé of tubercles on the individual ossicles Mol ucc as; 310 Metres) helius i/5 ba distal cirrus segments broader than long-, and bearing a high narrow sharp keel the crest of which is parallel to the axes of the segments; each of the elements of the division series bears a more or less developed low rounded median tubercle (southern Japan;? dept h) . . . . septentrionalis i. Crossometra investigatoris (A. H. Clark). A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 82 {Pacliylometra investigatoris). Proc. U.S. National Museum, vol. 39, 1911, p. 556 {Pacliylometra liind). Crinoids of the Indian Ocean, 1912, p. 216, fig. 39, p. 217 {Pacliylometra investigatoris). Stat. 297. io°39'S., i23°4oE. Timor Sea. 520 Metres. 3 Ex. The largest specimen has 20 arms 110 mm. long; there are no IIIBr series; the cirri are 30 mm. long with 22 — 23 segments; another has 21 arms; the third has 18 arms about 90 mm. long. 2. Crossometra helius (A. H. Clark). A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 19 12, p. 78 {Pacliylometra helius). Stat. 254. 5°4o' S., I32°26'E. 310 Metres. 5 Ex. The centrodorsal is of moderate size, fiattened hemispherical or thick truncated conical, 6 mm. in diameter at the base, 3 mm. across the flat dorsal pole and 4 mm. high; the cirrus sockets are arranged in ten equally separated columns of two or three each. The cirri are about XXV, 23, about 28 mm. long; the first segment is short, the following graduallv increasing in length to the fifth and sixth which are the longest. between one third and one half again as long as broad ; the following segments very slowly decrease in length so that those in the distal third of the cirri are about as long as the distal diameter; in the distal third of the cirri the median portion of the distal dorsal edge of the segments is somewhat swollen, this on the last five or six before the penultimate becoming a blunt subterminal dorsal tubercle ; the opposing spine is prominent, short, sharp, terminal, directed obliquely forward. The ends of the basal rays are visible as large rhombic tubercles in the angles of the calyx ; the radials are entirely concealed; the IBi'j are very short, broadly V-shaped with the proximal and distal edges parallel ; the lateral thirds of the proximal and distal edges are slightly produced ; the axillaries are very short, nearly or quite three times as broad as long, rhombic in shape with concave sides and truncated lateral angles, the lateral edges being as long as those of the IBi^; the lateral edges and all but the median portion of the proximal edge are very slightly produced ; the synarthrial tubercles are low and broad, scarcely evident. The contour of the proximal portion of the animal is broadly rounded, as in C. septentrionalis. The 26 arms are 125 mm. long; there are seven IIBr 4(3 + 4) and three IIBr 2 series; the IIIBr series are 2, internally developed except for one, which is situated by the side of an internal IIIBr series. 1 -II • ■ dorsal porrion of the 1ms.i1 segments of Pd is visible between the [IBr series. The dorsal profile i>t' the arms is smooth. \ similar specimen has 2S arms; eight of the IIBr series are 4(3 | 4) and two are 2; the cirri are frora 25 mm. to ;vj mm. long with 20- 23 segments. rhe remaining three examples are small, with 20. ig and 17 arms. 3. ( 'ptentrionalis \. II. Clark). .\. II. Clark. Proc. U.S. National Museum, vol. 34, 1908, p. ,12 [Charitometra distincta). tional Museum, vol. 39, 191 1, 554 [Pachylometra se ptentrionalis). Perissometra \. II. Clark. Key t<> the Species of the Genus Perissometra. 'roximal portion of the animal abruptly constricted, the sides of the [Br seen in lateral view, being nearly parallel, but the sides of the IIBr and arm bases divergent; 14 — 20 arms 75 mm. long; IIBr | 3 +4); cirri XX XXV, iS — 23, all, or most, of the segments longer than broad Meangis Islands; 900 Metres) angusticalyx onstriction of the proximal portion of the animal li' 14 — 20 (usually 20) arms c1 IIBr 2; rather slender; cirri with all of the component segments longer than broad d1 ossicles of the division series and brachials each with a broad low inconspicuous median keel which persists to the end of the arms; distal edges of the discoidal brachials bevond the second prominently and abruptly everted, of the more distal triangular brachials produced and overlapping; arms 14 — 20, 170 mm. to 175 mm. long; cirri rather short and wr;ik. XX — XXX, 17 — 22, 30 mm. to 37 mm. long S a h u 1 Bank and the Kei Islands t o t h e Philip- pines; 104 1 |.o Metres) patuia d ossicles of the division series with the dorsal surface unmodified, or with a more or less d<-veloped broad rounded tubercle; no eversion of the distal borders of the brachials; 12 — 16 arms 250 mm. long; cirri very long and stout. XX — L, iS — 3] (usually 28—31) 55111111. to 70 mm. long (Sahul Bank and Timor to the Kei Islands; 2^2 — 5 20 Me t r e s) rooit s/a IIBr 1 ; \ . stout: ossicles of the division series and brachials each with a low median rounded tubercle which becomes obsolete in the .u of the arms d' brachials with smooth and unmodified distal edges and a slightly orsal surfaee; profile oi the division series and arm bases divi it an angle of slightly less than 900; arms 205111111. long; i77 cirri XXX, 17 — 19, 25 mm. to 30 mm. long, the distal segments broader than long (Philippine Islands; Pdepth) selene d2 brachials with prominently swollen and produced distal borders and sunken dorsal surface; profile of the division series and arm bases diverging at an angle of more than 900 ; arms about 170 mm. long; cirri XXIV, 19 — 24 (nsually 21), 25 mm. to 40 mm. (usually 30 mm. to 35 mm.) long, the distal segments slightly longer than broad (Kei Islands and Timor; j ^ — 310 Metres) . ■ . gorgonia \r not more than 1 3 arms c1 all of the cirrus segments much broader than long, those in the distal half of the cirri tvvice as broad as long; ossicles of the division series and first four brachials with the dorsal surface raised into a broad blunt keel, highest and most conspicuous on the first maned; brachials in the proximal fourth or third of the arm with indications of a broacl low median tubercle ; 10 arms 165 mm. long; cirri XX, 17 — 20, 20 mm. to 25 mm. long, very stout (Timor; 520 Metres) timorensis c2 several, or most, of the cirrus segments as long as, or longer than, broad d1 cirri very stout, none of the segments longer than the distal diameter, the outer broader than long, each with a prominent blunt carinate process; ossicles of the IBr series with a plain and even surface, or with a slight indication of a broad rounded median keel ; brachials with an unmodified dorsal surface; 10 — ir stout arms about 180 mm. long; IIBr 4 (3 + 4); cirri XXV, 18 — -22 (usually 20), 32 mm. long (Kei Islands; 487 Metres) * crassa d" cirri more slender, most, or all, of the segments slightly longer than broad ; ossicles of the division series and first two brachials with the median portion elevated into prominent broad keels or prominent, more or less irregular, tubercles e1 less than 20 (usually 15 — 18) cirrus segments; the median portion of the ossicles of the IBr series and first two brachials is abruptly raisecl into an irregular rounded tubercle; the remainder of the dorsal surface of these ossicles is very uneven, and the proximal and distal borders are more or less irregularly crenulate; 10 arms 115 mm. long; cirri XX, 15 — 20 (usually 15 — 18), 21 mm. long, the outer cirrus segments bear small blunt terminal tubercles (southern Japan; 650 Metres) lata 111 ore than 20 (20 — 31) cirrus segments f1 the dorsal surface of the ossicles of the division series and first two brachials is rather sharply convex, rising into a broadly rounded median ridge with a more or less distinct median tubercle, so that the interradial angles appear sunken in a il S.-EXPEDITIK XI.I1 />. ^3 '7's V-shaped groove; 10 -13 arms [75 mm. long; IIBr 2; cirri \\ XXV, 20 25, most of the segments longer than broad, the outer without terminal tubercles (Kei Islands; 252 Metres) flexilis t' the >l«>i's.il surface of the ossicles of the IBr series and first two brachials is not • l, but bears more or less prominent oval or rounded median tubercles dlvision series all 2: ossicles of the division series and first two brachials with slightly developed broad median tubercles, or none at all; there is no eversion of the adjoining lateral edges of these ossicles; cirri very long and stout. XX — L, usually 28—31), 55 mm. to 70 mm. long, the outer segments markedly longer than broad; 12 — 16 arms ' mm. Ion- (Sahul Mank, the Kei Islands and Ti mor; 252 — 520 Metres) robusta IIBr series 4 (3 + 4); ossicles of the division series and first two brachials with large and prominent oval or rounded median tubercles, with rise more or less abruptly; the adjoining lateral edges of these ossirlcs are slightly everted; cirri XX XXIII, 20 — 22, moderate in size. rather slender. the longest proximal segments about half again as long as broad, those in the terminal third slightly longer than broad, the last two or three before the penultimate with slight traces of dorsal tubercles h1 ossicles of tke division series and first two brachials with low broad median tubercles; proximal subquadrangular brachials with the distal ends thickened and everted, and with small rounded median tubercles; remaining brachials with rather prominently overlapping distal ends; 12 arms 170 mm. long; cirri XXIII, 20 — 21, 30 mm. to 34 mm. long (Andaman Islands; 1024 Metres) . . . . invenusta h of the division series and firsl two brachials with smaller, prominent, rather high median tubercles; proximal subquadrangular brachials unmodified; brachials bevond without prominent distal ends; 13 arms 170 mm. Ion-; cirri XX, 21 22, 25 mm. to 36 mm. long (Laccadive Islands; 120., Metres) macilenta 1 Perissometra angusticalyx (I'. II. Carpenter). P. II. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 242, pi. 2. fig. \a—d, pi. 50, figs. 1 ;B, p. tedon angusticalyx A. II. Clark. Smithsonian Miscellaneous Collections, vol l 1. [913, X' 15, p. 47 (Packylometra angiisti 179 2. Perissometra selene (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 39, 191 1, p. 556 {Pachylometra selene). 3. Perissometra gorgonia sp. nov. Stat. 254. 5°40'S., I32°26'E. Arafura Sea. 310 Metres. 1 Ex. Stat. 294. 10° 12'. 2 S., 1240 27'. 3 E. Timor Sea. Ji Metres. 1 Ex. The centrodorsal is small, apparently conicaj, the cirrus sockets arranged in ten closely crowded columns. The cirri are XXIV, 19 — 24 (usually 21), 25 mm. to 40111111. (usually 30 mm. to 35 mm.) long; the segments are very uniform in length, the sixth or seventh and following being slightly longer than broad ; the distal edges of the segments are slightly prominent, and the distal edges of those in the outer half are slightly thickened 011 the dorsal side. The cirri are relatively largfer and stouter than those of P. selene. The ends of the basal rays are visible as very large rhombic or rounded triangular low tubercles or flat areas in the angles of the calyx. The radials are concealed. The IBrj are extremely short, in the angles of the calyx running far upwards and meeting over the ends of the basal rays; they bear a low broad median tubercle. The axillaries are rhombic, about tvvo and one half times as broad as long; except in the median line their edges, like those of the IBij, are slightly everted ; they bear a large low broad median tubercle. The 20 arms are about 170 mm. long; all ten of the IIBr series are 4 (3 +4); each of the component ossicles carries a low rounded median tubercle, and has slightly thickened edges all around. The earlier brachials have slightly thickened and more or less everted distal edges, which as the brachials become triangular change to simple overlapping distal ends ; traces of a low rounded median tubercle may be found at least as far as the end of the proximal thircl of the arm. The specimen from Stat. 254 has 17 arms 130 mm. long; five of the IIBr series are 4 (3 + 4) and two are 2; the cirri are rather slender, XXV, 14 — 16, 16 mm. long. 4. Perissometra patuia (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1SS8, p. 219, pi. 43 {Antedon patuia). Bell. Journ. Linn. Soc. (Zool.), vol. 24, 1893, p. 341, {Antedon. patuia). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, X' 15, p. 48 {Pachylo- metra patuia). 5. Perissometra robitsta (P. H. Carpenter). P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 220, pi. 44, figs. 1 {Antedon robusta). BELL. Journ. Linn. Soc. (Zool.), vol. 124, 1893, p. 341' {Antedon patuia, part). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 191 3, X" 15, p. 49 Pachylo- metra robusta). Stat. 297. io°39'S., I23°40 E. Timor Sea. 520 Metres. 2 Ex. One of the specimens has the cirri 55 mm. to 70 mm. long, composed of 28 — 31 segments of which the first four are short, the following gradually incressing in length to the ninth which, with the following, is about half again ;is long as broad; the distal ventral edge Ejment projects slightly above the base of the eeding segment; the last six <>r seven segments taper very graduall) so that the cirri, which troughoul most of their length .in- about 2 mm. broad, become on the penultimate segment 1.2 mm. broad; the opposing spine is repi I bj .1 very slight terminal tubercle; the penultimate and the distal third of the antepenultimate segment sometimes the penultimate and antepenultimate and the distal third of the preceding are highly polished in contrast to the dull surface of the preceding ossicles. The centrodorsal is large and thick, truncated conical, 8 mm. broad at the base and mm. across the stellate dorsal pole, 6 mm. high; the cirrus sóckets are arranged in ten closely crowded columns of two each, with one in the centre of a radial depression and one on an interradial ridge; on the proximal edge of the centrodorsal there are rounded interradial ridges which are produced distally in a sharp angle between the proximal portion of the •mal cirrus sockets, which meet below them; proximally these fork, becoming prominent rather high tubercular processes on either side of the end of the basal ray, which they much nble, the surface of the stellate dorsal pole is slightly concave; in the centre, with more or less marked radial and interradial grooves; the énds of the rays of the star are not inter- radial. but are somewhat twisted clockwise so that they come under the left colum of cirrus sockets. in each radial area. The ends of the basal rays are visible as prominent dorsoventrally elongate tubercles in the angles of the calyx. The edge of the radials is just visible bevond the centrodorsal. The I Br, are verv short, with parallel sides, distally incised by a rounded posterior projection from the axfllary, laterally curving upward and meeting over the ends of the basal rays; the distal inner angles are somewhat cut away; the median third of the dorsal surface is swollen, forming a more or less evident laterally elongated large low rounded tubercle; the proximal edge is slightly produced, especially in the lateral thirds; the distal outer angles slightly swollen. The IBr axillaries) are rhombic, twice as broad as long; the edgi lightlj raised; the dorsal surf .cept in the lateral thirds, is slightly raised. most prominently in the median line just within the proximal border and on tin median part of the two distal faces, just within the distal borders; the lateral angles are more or less irregular, with a greater or r tubercular modification; the lateral edges are more or less cut away, forming, with a similar truncation of the distal angles of the Il'.r,. a prominent water pore. There are fourteen arms, all in process of regeneration ; the lllir, series are all 2, mbling the IB and with the same water pores, but with die outer edges more ilarlv tuberculous; the first two brachials are similar to the elements of the tlixi^i < >n tnd have water pores interiorly and exteriorl) between them; the remaining brachials jmooth and unmodified surface. as figured bj Carpenter; but this is possibly due to : vet they an- incompletely regenerated. ipecimen is essentially similar; there an en arms. all of the [IBr series Ibl being 2 ; all of the arms except three, which are broken, are regenerating. The tubercles on the ossicles of the division series and on the first t\\ro brachials are not quite so extensive, though slightly more marked ; the proximal and distal borders of these segments except in the median line are slightly produced and slightly scalloped, this increasing progressively to to the margin; the lateral edges are similarly produced and slightly swollen, but nearly straight without tubercular modification ; very narrow transversely elongate slits, scarcely noticeable, mark the position of the future water pores. These specimens appear to belong to Carpenter's robusta, though they are more developed than his type. The chief characteristic of the species is the very long and stout cirri. 6. Perissometra macilenta (A. H. Clark). A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 81 [Pachy lometra macilenta). Crinoids of the Indian Ocean, 191 2, p. 222, fig. 41, p. 223 [Pachy lometra macilenta). 7. Perissometra invenusta (A. H. Clark). A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 149 {Pachylometra invenusta). Crinoids of the Indian Ocean, 1912, p. 220, fig. 40, p. 221 [Pachylometra invenusta). 8. Perissometra crassa (A. H. Clark) A. H. CLARK. Proc. Biol. Soc. Washington, vol. 25, 1912, p. jj [Pachylometra crassa). Stat. 259. 5°29'.2S., i32°52'.5E. Between Kei Islands. 487 Metres. 2 Ex. The centrodorsal is very large, truncated conical, the sides making a rather small angle with each other, 9 mm. in diameter at the base, 5 mm. across the irregularly convex dorsal pole, and 5 mm. high ; the cirrus sockets are arranged in ten columns, usually three to a column, the columns being closely crowcled interradially, slightly separatecl radially. The cirri are about XXV, 18 — 22 (usually 20), 25 mm. to 32 mm. long, stout and short segmented ; the first segment is short, the following gradually increasing in length so that the sixth and following are nearly as long as broad, those in the outer third of the cirri being slightly shorter again; on the seventh a slight broad subterminal dorsal hump makes its appearance which slowly increases in height so that the terminal nine possess a prominent broad blunt and well rounded subterminal tubercle which becomes more pointed on the last two or three before the penultimate; the opposing spine is small, subterminal, resembling the tubercle on the preceding segment, but arising from a much smaller base. The radials and the ends of the basal rays are concealed; the IBrj are very short, broadly V-shaped, sometimes concealed in the median line so that only the lateral portions are visible ; the dorsal surface is more or less irregular ; the axillaries are short and broad, nearly three times as broad as long, rhombic, the lateral angles truncated so that the lateral sides are nearly or quite as long as those of the IBrr The arms are 10 or 11 in number, about 1 So mm. long; the IIBr series are 4 (3 + 4); the first two brachials are about equal in size, slightly wedge-shaped (more pronouncedly so [82 on the second), about three times as broad as the median length; the broad smooth synarthrial tubercles are scarcely marked; the brachials have slightly produced distal edges and a more <>r lcss swollen dorsal surface. Perissometra flexilis (P. II Carpenter). P. II. CARPENTER. ■Challenger" Reports. Comatulae, i888, p. 217, pi. \2 Antedon flexilis). \. II. CLARK. Smithsonian Miscellaneous Collections, vol. 61, [913, N° 1;. p. 48 [Pachylo- metra J ro. Perissometra lata (A. H. (Clark). ' A. 11. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 129 {Antedon lata). Proc. U.S. National Museum, vol. 34, 1908, p. 312 {Charitometra lata). 11. Perissometra timorensis (A. 11. Clark). A. 11. CLARK. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 80 [Glyptometra timorensis). io°39'S.( i23°40 'E. Timor Soa. 520 Metres. 4 Ex. The centrodorsal is very thick discoidal, the sides sloping slightly inward, 6.5 mm. in diameter at the base (5 mm. in the smaller specimen) and 3 mm. high (2.5 mm. in the smal the cirrus sockets are arjranged in ten columns of two each, the columns closely crowded against h other and showing no differentiation into pairs. The cirri are XX, 17—20, 20 mm. to 25 mm. long, stout: the first segment is very short, the following gradually increasing in length to about the seventh which, with the following, is about twice as broad as the median length or, in the longest cirri, half again as long as the median length; the dorsal profile of the segments bevond the seventh or eighth is convex, becomiiw graduallv more strongly so toward the end of the cirri. In the smaller specimen the median portion of the distal dorsal edge of the segments is slightly raised, and at the same time a broadly rounded carination appears which slowly becomes higher and narrower, and very prominent on the segments beyond the eighth; this carination has a straight distal border which is parallel to the longitudinal axis of the s< gments. In the larger specimen there is only a mere tracé of this carination, which is very broadly rounded off so that in lateral view the segments are regularlj convex dorsally. The ends of the basal rays are visible as flat triangular or irregular areas in the angles of the calvx; the radials are entirely concealed, or are slightly visible as smal! irregular tubercles or flat irregular areas in the angles of the calyx; the [Br, are short, broadly chevron-shaped, the proximal and distal borders parallel, about tour times as 1, ro.nl as long; the proximal edge is pp thin border overlapping and concealing the proximal portion oi the centro- dorsal. though flush with neral surface; the border of this produced proximal edge is usually irregularly scalloped or bears a few low coarse teeth, though it may be nearly plain; • r ,1 few low tubercles; it may be evenly curved, becoming horizontal just i8- over the ends of the basal rays, or it may be regularly curved in its lateral thirds but nearly straight in its median third ; the middle of the dorsal surface of the lBrx is occupied by a large prominent broadly oval well rounded tubercle ; the axillaries are broadly rhombic with the lateral angles truncated so that the lateral edges are from one half to two thirds the length of the sides of the IBi^, two and one half times as broad as long, in the median line nearly twice as long as the IBrj ; the centre, except at the anterior angle, is occupied by a tubercle which is more elongated dorsoventrally than that on the IBr^ and, though as high. less prominent as it rises much less abruptly; the lateral edges of the IBrj and the IBr„ are turned slightly outward ; the lateral thirds of the proximal edge of the axillaries and the corresponding portions of the distal edge of the \Brl are also turned upward to the same height as the lateral edges ; the eversion of the latter is most marked just over the ends of the basal rays and gradually decreases anteriorly to the distal corner of the lateral edge of the axillary; it is continued thence along the sides of the first four brachials ; the inner lateral eclges of the first five brachials are similarly modified. The arms are, in the type, 165 mm. long. The first brachial is wedge-shaped, slightly longer exteriorly than interiorly, twice as broad as the exterior length; the proximal border is narrowly produced ; the outer border is produced like the lateral borders of the axillaries; the inner border is similarly produced, especially at the distal angle, which is more or less rounded off and overlaps the proximal inner angles of the second brachial. The second brachial is about the size and shape of the first, with the outer edge similarly produced ; the production of the inner edge is like that of the outer, but not so marked. The third and fourth brachials form a syzygial pair which is oblong, about twice as broad as long, with the lateral edges turned outward as in the brachials preceding; the following brachials are slightly wedge-shaped, about twice as broad as long; one brachial between the Fig- 7- Lateral view of a specimen of Perüsometra timoretisis from Stat. 297. Natural size. (Courtesy of the U. S. National Museum). i 8 | ninth and thirteenth (usually tl nth) is oblong, and the following quickly become triangular, is long as broad. rhe first four brachials have a low very broadly rounded median carination which is very obscure; the following have an equally obscure slight very broad cönvexity in the middle of the dorsal surface which after the eight or ninth becomes smaller in area and resolvés itself into a low rounded tubercle witch gradually disappears after the end of the proximal third, though it may be detected as far as the end of the proximal half. The ornamentation of the smaller specimen is similar, but the tubercles on both elements of the IBr fhtly narrower so as to appear as a broadly rounded carination. < >ne of the specimens is six-ray< Pachylometra A. II. Clark. Key to the Species of tin- Genus Pachylometra. a' Cirri rather short and very stout, the segments very slightly, if at all, longer than broad, the outer more or less distinctly carinate, but without terminal tubercles; cirri XX — XXV, about 20; 20 arms 100 mm. long (Kermadec Islands to Fiji; 1134 — 2430 Metres) inaequalis 1 'irri longer and less stout, the longer proximal segments half again to twice long as broad b1 20 — 28 arms c1 outer cirrus segments only slightly shorter than the more proximal, at least one third again as long as broad, with no tracé of dorsal tubercles; 15 — 20 cirrus segments; 20 arms about So mm. long (off East London, ith Africa; 450 — 540 Metres) sclateri nents much shorter than the longer proximal, at most only very slightly longer than broad and usually slightly broader than long, with prominent terminal tubercles on the mid-dorsal margin; cirri XXV] XXX, 10—24; 21 — 28 arms 100 mm. to 155 mm. long (Phi- lippinelsland Metres distincta Ir 12 — 14 arm-,, 100 mm. long: cirri XXX -XXXV, 14 — 15. [5 mm. long ilippine Islands; 889—1316 Metres) levigata 1. Pachylometra inaequalis il'. II. Carpenfc P. II. CARPENTER. "Challenger" Reports. Sta: pi. 54, fig. 8 {Antedon inaequa "Challenger" Reports. Comatulae, 1888, p. 144, pi. 2, figs. 50— d; pi. 51, fig. 2- text ie i.\, ji. J40 [Antedon inaequa/, A. II. I lark. Smithsonian Miscellai ollections, vol. 01, 1913, \" 15. p. 4S [Pachylo- metra inaequah i85 2. Pachv lomctra sclateri (Bell). Bell. Marine Investigations in South Africa, vol. 4, 1905, p. 140, pi. 3, figs. 1 — 3 {Antedon sclateri). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1 9 1 3, N° 15, p. 48 {Pachylo- metra sclateri). 3. Pachylometra distincta (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 247, pi. 51, fig. 1 {Antedon distincta). A. H. Clark. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 1908, part 2, p. 227 {Charitometra smithi). Proc. U. S. National Museum, vol. 39, 191 1, p. 555 {Pachylometra distincta); p. 557 {Pacl/ y lometra smithi). Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 48 {Pachylometra distincta). 4. Pachylometra levigata A. H. Clark. A. H. CLARK. Proc. U.S. National Museum, vol. 36, 1909, p. 406 {Pachylometra levigata). Monachometra A. H. Clark. There is only one species in the genus Monachometra. 1. Monachometra fragilis (A. H. Clark). A. H. CLARK. Proc. Biol. Soc. Washington, vol. 25, [912, p. 79 {Pachylometra fragilis). Stat. 166. 2°28'.sS., i3i°3'.3E. Halmahera Sea. 118 Metres. 1 Ex. The centrodorsal is low, flattened hemispherical, 7 mm. in basal diameter and 3 mm. high; the cirri are closely crowded, arranged in tvvo or three irregular rows and approximately fifteen columns, three in each radial area ; the cirrus sockets in the proximal row reach the proximal border of the centrodorsal. The centrodorsal in general resembles that of the species of Crinomeira. The cirri are about XXX, 17 — iS, 30 mm. to 35 mm. long, moderately slender; the first four segments are short, the fifth half again as long as broad, the sixth, seventh and eight twice as long as broad, the following gradually decreasing so that the distal are about as long as broad, and the terminal increasing again so that the penultimate and antepenulti- mate are about twice as long as broad; the longer proximal segments have slightly prominent ends, while the shorter distal have the dorsal distal margin slightly swollen. Deep, but very narrow, subradial clefts are present. The ends of the basal rays are large and prominent, forming rhombic areas in the angles of the calyx. The radials are very short, strongly curved, with a low, broad and obscure median tubercle. The IBrx are exteriorly very short, band-like, with an obscure low median tubercle ; inwardly they are produced toward the centre of the calyx so that their sharply flatened SIBOGA-EXPEDITIE XLU*. 24 [86 Imost meet, being separated only by .1 narrowly V-shaped cleft running to the of the inner edge of the iynarthrial joint face; though the dors. il surface of the segment is well rounded, the distai ntral canal to 1 1 1 « - median pari of the dorsal edge is at as the dista om the central panal to the inner angle; counting the entire median length of the joint face the broadest portion is found t<> be scarcelj more than one third of the «list. uu-e from the dorsal edge to the inner angle; the ossicle is sharply "wall- .' from its widesl point inward; the axillaries are low, rhombic, with the lateral angles truncated so th.it lateral • Iges are about as long as the lateral edges of the IBr' twio a I as long; there is an ol well rounded median carination; the distal angle is pmduced, hut broad; the dorsal su ■ rather strongly convex; the lower portions of the axillaries are strongly produced inward so that, as in the case of the IBr,, the inner sides are reduced almost to apices which nearly meet the similar inner ends of the other axillaries; from this central point the inner face of the axillaries slopes away almost horizontally so that the inner ■ of the axillaries, together with the division series, form the platform upon which the :ral mass rests; the sides of the inner half of the axillaries are sharply "wall-sided"; the [IBr similar to the IBr series, hut rapidly decrease in dorsoventral width; they are sharply flattened laterally tor somewhat more than their inner half; the first two brachials are flattened laterally tor their entire inner side, and the third and fourth are flattened on the inner portion of the inner side. nineteen arms are 145 mm. long. All of the IIBr series are 2. 1' is slender and evenly tapering, 9 mm. to 10 mm. long, composed of from twenty-six to thirty-one segments all of which are much hroader than long. I', is similar, hut very slightly stouter, ol the same length or very slightly longer, composed of twenty-five segments of which the outermost are about as long as broad. P, is 1 1 mm. long, composed of twenty-two nents; in general it resembles P, . but the segments in the distal half are about as long as broad. 1', is 1 1 mm. long with twenty segments which become as long as broad on the fifth or sixth, and slightly longer than broad terminally. P. is 9 mm. long with (ïfteen segments, most ol which are about as long as broad. Pe is S mm. long with fourteen segments, and 1' is 7 mm. long with thirteen segments. The distal pinnules are slender, 10 mm. long with twenty segments. < >n the genital pinnules the third-seventh segments are very slightly, almost imperceptibly, broadi 1 I he coloor, in alcohol, is brownish white, the centrodorsal and division series brownish grey. Another specimen, similar to the one just described but smaller Cat. .V 35707 U.S. Nat. Mus.), was dredged by the "Albatross" off southern Luzon, Philippine Islands, in 24;, Meti Stat. 51101; it also has nineteen arms; the fourth-tenth segments of the genital pinnules >mewha1 led, considerably more so than in the preceding. Crinometra A. II. Clark. At present this genus is in a most state. It includes the following nomina! species: rALÈS. Buil. Mus. Comp. 1 1, 1868, N° 6, p. 111. ( 'omatula brevipit, is7 POURTALÈS. Buil. Mus. Comp. Zool., vol. 5, 1S78, N° 9, p. 215. Antedon granulifera P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 212 (in key). Antedon pourtalesi A. H. Clark. Proc. U. S. National Museum, vol. 34, 1908, p. 266, fig. 3. Charitometra imbricata A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, pp. 644 — 648. Crinometra pulchra Crinometra margaritacea Crinometra concinna Crinometra insciilpta Crinometra gemmata HARTLAUB. Memoirs Mus. Comp. Zool., vol. 27, 1912, N'J 4, pp. 2S7 — 308; 311 — 358. Antedon brevipinna var. decora Antedon brevipinna var. gracilis (preoccupied name) Antedon brevipinna var. pulchra (preoccupied name) Antedon brevipinna var. elegans (preoccupied name) Antedon brevipinna var. tuberosa (preoccupied name) Antedon brevipinna var. diadema (preoccupied name) Antedon brevipinna var. iaevis (preoccupied name) Antedon brevipinna var. spinosa (preoccupied name) Antedon brevipinna var. corona ta Antedon brevipinna var. ornata Antedon brevipinna var. grannlosa In addition to these just given the species referred to by Hartlaub as Antedon angusli- calyx P. H. Carpenter, Antedon granulifera Pourtalès, and Antedon pourtalesi P. H. Carpenter, as well as Antedon brevipinna (Pourtalès), belong in this genus. Chondrometra A. H. Clark. Key to the Species of the Genus Chondrometra. a1 Centrodorsal very large, truncated conical or more or less columnar; cirrus sockets arranged in ten regular columns, two, more or less widely separated in the midradial line, in each radial area ; cirri short, one sixth of the arm length, equal in length to the distance from the axillary to the twentieth brachial, XXX, 18 — 19, 35 mm. long; arms 210 mm. long (Ti mor and the Molluccas; 520 — 871 Metres) ritgosa iSS I i ntrodorsal small <>r of medium size, sharply eonical, the cirrus sockets arrai in five more or less irregular columns one in the midline of each radial area; i long, from one fourth to one third of the arm length cirri numerous, with numerous segments, XX XXV, 26—28, 55 mm. to 60 mm. more than one fourth of the arm length, equal to the distance from the axillary to the forty-sixth brachial; arms 211 mm. long I imor to the Philippine Islands; 5211 675 Metres) robusta b si/c small: cirri less numerous with fewer segments, XV, 18, 27 mm. long, about one third of the arm length, equal to the distance from the axillary to the twentieth brachial; arms 75 mm. long (Meangis Islands; 900 Metres) aculeata 1. Chondrotnetra rugosa nov. sp. 5., i23°4o E. Timor Sea. 520 Metres. 1 Ex. Centrodorsal very large, truncated eonical, almost columnar, 9 mm. broad at the base, mm. across the slightly convex dorsal pole, and 7 mm. high interradially ; the cirrus socki arranged in ten regular columns, two to each radial area; the columns in each radial area are almost or quite in contact which each other; the columns of adjacent radial ■ are separated by a narrow and irregular bare area, which may show a slight narrow rounded ridge in its centre; there are three cirrus sockets to a column. The cirri an- XXX, iS —19, 35 mm. long, stout and short; the first segment is very short, the second is about twice as broad as long, and the following gradually increase in length so that the fifth is about as long as the median or distal diameter; the remaining segments are all about half again as long as the proximal diameter; the lasi five decrease rather rapidly in diameter so that the pcnultimate ment and the terminal claw are very small. After the first four arents the cirri become rather strongly compressed laterally: the ends of the segments are slightly swollen and prominent. '1 he ends of the basal rays are visible as small tubercles in the angles of the calyx; the radials are entirely concealed ; the IBr, are almost co: ;, but their distal portion, which is more or less irregular and tubercular, is visible as a narrow band just below the axillaries. The proximal brachials have the same prominent median tubercles as tho C. robusta, but they are pointed instead of being rounded as rai view of the proxi- in that and they lean somewhat anteriorly, so that they appear mal p Na. as broad stout overlapping >pines. Instead of being |)erfectly smooth as f'he in C. robusta, the distal borders of these earlier brachials are thickened Museum). and produced; 1 thickened and produced borders after the first six or seven brachials bear, beside the large broad median spine (of which the base runs backward along the whole median line of the dorsal surface of the segment) one or two smaller and pointed spines between the median spine and the lateral cd^c which do not involve the al surface of the segment. i8g The ten arms are about 210 mm. long; the diameter of the animal at the level of the seventh brachial is 22 mm., as against 19 mm. in C. robusta. A specimen of this species in the collection of the United States National Museum was dredged at "Albatross" Stat. 5656, Gulf of Boni, in 871 Metres (Cat. N° 35702). 2. Chondrometra robusta (A. H. Clark). A. H. CLARK. Proc. U.S. National Museum, vol. 39, 191 1, p. 558 (Chlorometra robusta). Stat. 297. io°39S., i23°4o'E. Timor Sea. 520 Metres. 6 Ex. One of the specimens, with arms about 170 mm. long, very closely resembles the type; it is very slightly smaller and more slender, and the median ornamentation of the arms is slightly less pronounced, though of exactly the same character. Another is somewhat smaller than the preceding, with the dorsal ornamentation somewhat less marked; the cirrus sockets are arranged in a single regular column in the centre of each radial area, three, in one case four, to a column ; the surface of the centrodorsal betvveen the columns of cirrus sockets is bare and flat. A very small specimen has the arms 75 mm. long; the centro- dorsal, which exactly resembles that in the preceding except that the interradial areas are slightly convex, appears unnaturally large ; the radials are as large as the IBr^ deep subradial clefts are present; the longest cirrus is 18 mm. long, compose/d of 17 segments the short apical cirri are 7 mm. long with 1 1 segments, of which the third corresponds . . . Lateral view of the centvo- to the fourth in the larger cirri; the longer segments are proportionately dorsal of a specimen oi ciwn- slightly longer than in the larger cirri, and there are only four short . 12Ó, pi. i | pi. 23, I A. II. Clark. Proc. U.S. National Museum, vol. 39, [911, p. 557 [Glyptometra tuberosa). Smithsonian Miscellaneous Collections, vol. 61, 1913, Nc 15, p- 49 [Glyptometra tuier ptometra tuberosa A. II. Clark. Proc. U.S. National Museum, vol. 36, 1909, p. 407]. Chlorometra A. II. Clark. The only species in the genus Chlorometra is 1. Chlorometra garrettiana (A. II. Clark). \. II. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 142 Antedon garrettian Poecilometra A. II. Clark. Key to the Species of the Genus Poecilometra. trodorsal large and broad (in large specimens about 5 mm. in diameter at the base); the profile of the [Br series and arm bases makes only a very '.u angle with the dorsoventral a\is; the IBr series are usually ('but not always) somewhat constricted so that the arm bases broaden rather suddenly above them ; cirri XXV- XXX, 15 -18; arms about 100 mm. long ('north- ea stern end of Celebes and the Meangis Islands; 900 — 1327 Me tres acoela ( "entrodorsal smaller (4 mm. in diameter at thé base) and lower; the profile of the IBr series and arm bases makes a considerable angle with the dorso- t ra I axis, and there is no constriction of the IBr series; cirri about XX, 2 o; arms 1 10 mm. long (south western Japan; 650 Metres) scalaris 1. Poecilometr P. II. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1S88, p. 132, pi. 2, fig. 3; pi. 16 [Antedon acoi A. II. Clark. Smithsonian Miscellaneous Collections vol. 61, 19 1 3, N° 15, p. 50 [Poecilometra aan Stat. 122. 1 ;s'.;N„ i25°o'.5E. Celebes Sea. 1165— 1264 Metres. 7 Ex. . 124. 2 27 V, 12335 !•".. Celebes Sea. 1327 Metres. 2 Ex. imens do not seem to differ appreciably, in si/e or otherwise, from others at 1 llected by the "Challenger". i9i In young- individuals in which the radials are still about half as large as the IBi-j (see the "Challenger" Report, pi. 16, fig. 5) there is but little tracé of the dorsolateral processes characteristic of the adults; they are only slightly evident, though they can be made out as a thickened ridge in the place they will eventually occupy; at this stage also the genital pinnules are slender and evenly tapering, showing 110 tracé of the lateral expansion of the segments which is so marked a feature in the fully grown. As the radials become shorter the proximal border of the IBrj becomes produced so that it conceals the radials and proximal edge of the centrodorsal when the animal is viewed laterally. The dorsal surface of the radials is gradually resorbed as the proximal margin of the IBr, is produced, so that the rays and arms appear to be too large for the radials and centrodorsal, giving the appearance of having been glued upon them instead of having grown out from them. In very large specimens the produced borders (proximal and lateral) of the IBi'j, which are typically smooth, become crenulate and scalloped. The two examples from Stat. 124 resemble those from Stat. 122. Charitometra A. H. Clark. 9 Key to the Species of the Genus Charitometra. a1 Brachials from the fourth onward with thickened, everted and tubercular distal borders, this character gradually dying away after the brachials become triangular ; arms about 100 mm. long (Kermadec Islands; ?Fiji; 11 34 and r 2430 M e t r e s) basicurva a- Brachials with unmodified distal borders, the arms appearing quite smooth; arms about 90 mm. long (Kermadec Islands to Fiji; 11 34 Metres) . . . . iucisa Strotometra A. H. Clark. Key to the Species of the Genus Strotometra. a1 Distal border of the second brachial everted, standing out at right angles to the dorsoventral axis of the arm as an enormous this rounded or fan-shaped crest, with a rounded or broadly scalloped edge, sometimes divided in the middle, which may reach 1.5 mm. in height, the height being three or four times the greater (outer) length of the ossicle; the fourth brachial (the epizygial of the first syzygial pair) has a similar crest nearly, if not quite, as large, the fith brachial has a crest about half as high, and more irregular; the sixth has a strongly produced and thickened distal edge, which is coarsely scalloped ; the following brachials are of the normal type, with slightly produced and finely spinous distal border-s (e ast of the northeastern end of Celebes; 1165 — 1264 Metres) #. . . ornatissimns a" None of the brachials have extravagantly everted distal borders • I Q2 irri relatively slender, with elongated segments of which al but the basal as long as Ito. ui, and often loneer Kei [slands and Timor; 595 Metres priamus irri stouter, few or none of the segments longer than broad c1 and stouter arms from 65 mm. to 75 mm. long); proximal cirrus segments slightly longer than bröad, distal slightly broader than long Kei [slands and rimor; 252 — 520 Metres) parvipinna smaller and more delicate (arms 45 mm. long); al of the cirrus segments about as long as broad (southwestern Japan; 180 — 243 Metres) hepburniana 1. Stro tometra ornatissimus A. II. Clark. ,\. II. Clark. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 82. tat. 122. ; \ . 1 '. i'.j E. Celebes Sea. 1165 — 1264 Metres. 1 Ex. The centrodorsal is flattened hemispherical, 2.5. mm. in diameter at the base; the dorsal pole is slightly convex; the cirrus sockets are in one and a partial second marginal row. rhe cirri are about XV there are twenty-two cirrus sockets, but some are not tuil the longest cirrus stump is 4.5 mm. long to the distal dorsal edge of the fifth (the last remaining) segment; the first segment is about twice as broad as long, the second has the in length about equal to the median breadth, and is centrally constricted with the distal er produced, especially ventrally, where it overlaps the proximal end of the succeeding segment; the third is about twice as long as the proximal diameter, strongly constricted illy with prominent distal encls like those of the second ; the fourth is about three times as long as the median width, similar to the third; the fifth is similar to the fourth but not quite so constricted centrally and hence appearing slightly broader in lateral view. The radials are just visible over the edge of the centrodorsal. The IHr, are short, about four times as broad as the median length, with the proximal border produced into a thin straight margin and the lateral borders slightly more produced, and turned outward. The II Ir, taxillaries) are broadly V-shaped (inverted , with the lateral edges, which are half again as long as of the IMr,, turned ontward, unmodified, or with two or three broad scallops; the lateral thirds of the proximal r are produced and extended downward over the dist. tl r of the Ilïr,. and have a scalloped or tubercular border which is nearly parallel to the tvi distal edge opposite; the distal of the axillaries are plain and unmodified. The 11 1 arms are about p 1 mm. 1< w 4 10. 1 of the cenl 193 The first brachial has the proximal and distal edges parallel, the outer edg-e slightly produced and faintly scalloped, the inner edges in apposition, in their distal half everted and scalloped; a similar length of the inner portion of the distal edge is similarly everted and scalloped, and the inner distal angle is rounded and produced into a thin rounded process with more or less scalloped border-, the proximal border, and the distal border other than the portion described, is unmodined. The second brachial is about the length of the first, slightly wedge-shaped ; the distal edge is everted and stands out at right angles to the axis of the arm in the form of an enormous thin rounded or fan-shaped crest with a rounded or broadly scalloped edge, sometimes divided in the middle, which may reach 1.5 mm. in height, or from three to four times the greater (outer) length of the ossicle; the proximal outer corner of the segment is slightly produced backwards over the distal outer corner of the first brachial, and is scalloped or slightly tuberculated ; the produced inner distal angles of the first brachials reach as far as the base of the crest. The third brachial (the hypozygal of the first syzygial pair) is oblong, very short, five or six times as broad as long, unmodified. The fourth brachial (the epizygal of the first syzygial pair) is very short, oblong, little if any longer than the third (the hypozygal) ; the distal border is everted and produced into an enormous crest similar to, and nearly or quite as large as, that on the second brachial. The fifth brachial is slightly wedge-shaped, with a crest about half as high as that on the preceding brachial and more irregular. Fig. 11. The sixth has a strongly produced and thickened . , . , - . , ° J l Lateral view o! the proximal portion of a distal edge which is COarsely Scalloped. specimen of Strotomelra ornatissimus from Stat. ir I22- X 4- (Courtesv of the U. S. National Museum). The seventh is slightly wedge-shaped, from two to two and one half times as broad as long, with the distal edge slightly produced in the direction of the axis of the arm and finely spinous. After the tenth or twelfth the brachials become triangular, about as long as broad, and after four or five more very obliquely wedge-shaped and longer than broad, and distally longer and less obliquely wedge-shaped. Beyond the sixth the brachials are almost smooth, with only slightly produced and finely spinous distal edges. Px is about 4.5 mm. long with about thirteen segments of which the first two are broader than long with rounded dorsal processes, the third is slightly longer, the fourth is about as long as broad, and those beyond the seventh are slightly longer than broad. P.: is about 4 mm. long, similar to Pj , composed of twelve segments of which the outer are slightly longer than those of Pr The genital pinnules are about 4 mm. long, with the fourth, fifth and sixth segments enormously expanded, roofing over the gonads which are also protected ven- trallv by strong calcareous plates of irregular shape; the seventh and following segments are small and slender. ' S1BOGA-EXPEDITIE XLIli. 25 194 On one arm 1', and 1',. as well as the pinnules following, bear gonads, a condition beforc i »bsen ed. 2. Strotometra parvipinna (P. 11. Carpenti I'. II. Cari iorts. Comatulai i . p. \ i~ . pi. 15. fig. 9 {Antedon \. II. Clark. Smithsonian Miscellaneous ('ollections, vol. 61, [913, N' 15, p. 50 (Stro/ometra f,ii . E. Arafura Sea. 310 Metres. 1 I :. E. I imor Sea. 520 M< I Ex. The largest specinv n from Stat. 297 has the arms 75 mm. long, and is relatively large and stout; the surface of the dorsal 'pole of the centrodorsal and ol the radials and IBr, is thickly covered with irregular tubercles, so tha't it appears more or less sponge-like ; the borders of the ossicles of the IBr series and of the first two brachials are thickened and slightly ■ Br axillary) has a rather high median keel: the following ossicles have a prominent rounded median tubercle which becomes a low broad carinate process on the triangular brachials; the cirri are XVI, 12 — 13; the longest proximal segments (the third and fourth are slightly longer than broad; the distal segments are slightly broader than long; 1' has 17- yments. Another, similar to the preceding but with the arms only 60 mm. long, has the modi- Bcation of the surface of the radials and 1 1 ï i- 1 not so strongly rriarked; the cirri are X, 12. A third is similar to the last, but the modihcation of the surface of the radials is able; the cirri are X, 11 — 12; all of the others but one resemble this. A \i ry interesting individual with the arms 6=; mm. long has the IBr, with a high rounded median keel, and everted lateral borders; on either side of the median keel there are from two to five high rounded tubercles; the type of ornamentation as a whole strongly ests the condition found in Glyptometra tuberosa\ the IBr axillary has the borders slightly everted, and the distal borders margined with continent tubercles which rapidly diminish in width from the median line to the outer angles. 3. Strotometra hepburniana (A. II. Clark'. .\. II. CLARK. Proc. U.S. National Museum, vol. n, 1907, p. 139 {Antedon hepburniana). Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1900, p. 187 [Strotometra hepburnian 4. Strotometra priamus \. 11. Clark. A. II. CLARK. Proc. Biol. Soc. Washington, vol. 25, 1912, \>. Ni. Sta: ira Sea. 595 Metres. 39 Ex. 17. iOc 3'i S.. 520 Metres. The centrodorsal i^ very low. low hemispherical or almost discoidal, from 1.5 mm. to 195 2 mm. in diameter; the cirrus sockets are arranged in one and a partial second irregular closely crowded row. The cirri are XVII, 11 — 12 (usually 11), 8 mm. to 11 mm. long, slender, vvith elongated segments; the first segment is very short, dorsally expanded into a rounded knob-like process : the second is not quite so long as broad; the third is twice as long as the median diameter; the fourth and fifth are nearly three times as long as the median diameter; the remainder are very slightly shorter, becoming a trirle longer again, about two and one half times as long as broad, on the antepenultimate and penultimate ; the penultimate segment is of lesser diameter, in lateral view, than those preceding; the third and following are moderately constricted cen- trally with prominent distal ends, this feature decreasing distally; the segments carry no dorsal spines or other processes; the opposing spine is prominent, terminal, directed obliquely forward," its proximal profile convex, its distal concave, its base occupying only slightly more than one third of the dorsal surface of the penultimate segment; the terminal claw is about as long as the penultimate segment, moderately stout, and moderately and evenly curved. The ends of the basal rays are small but prominent tubercles in the angles of the calix. The radials are entirely concealed by the centrodorsal. The IBrj are short, about four times as broad as long in the median line; the proximal border is slightly produced, slightly convex but usually becoming straight in the lateral quarters ; the lateral edges are in close apposition with those of their neighbors, and are widely divergent, and produced and everted as in Calyptomctra lateralis\ the distal edge is sometimes obscurely scalloped in the lateral thirds, the median third being slightly excavated for the reception of a rounded posterior process from the axillary. The IBr, (axillaries) are exceedingly short, about two and one half times as broad as long; their lateral edges resemble those of the IBi-j, but are only about half as long. The 10 arms are 40 mm. long. The first brachials are in close apposition both internally and externally with their neighbors; their proximal and distal borders are parallel; their proximal borders are slightly everted; their outer borders are produced and everted like the outer borders of the preceding ossicles; the inner borders are similarly everted, but not so much so; the synarthrial tubercles, though small and well rounded, are rather prominent. The second brachials are similar to the first, but about twice as long externally as internally. The first syzygial pair (composed of the third and fourth brachials) is roughly oblong, about two and one half times as broad as long, with the lateral edges modified as in the preceding; the next three brachials are wedge-shapecl, about twice as broacl as the maximum length, the dorsal surface usually concave and the distal edge therefore prominent; after the tenth the brachials become triangular, about as long as broad, later very obliquely wedge-shaped, and toward the ends of the arms twice as long as broad. Beyond the second syzygy the brachials have slightly produced and very finely spinous distal ends. Pj is very slender and delicate, 6 mm. long with 35 segments of which the seventh or eighth and following are about as long as broad ; except for the absence of the expansion of the first two segments it resembles Px in Calomctra. P2 is 6 mm. long with 1 8 segments of which the sixth-eleventh are greatly produced ventrallv, forming a roof over the genital glands, I QÓ which are also further protected by a heavj ventra] plating; the terminal seven segments are small and delicate. P is similar, j.5 mm. long with 1 1 segments of vvith the sixth-tenth expanded to protecl the gonads 1'; is 1 mm. long with 1.; segments of which the fifth- ninth are expanded. 1' is 3 mm. long with 1 ments, none of which are expanded; the pinnule is small and moderately stout. Hie following pinnules graduallj increase in length, tl)': distal pinnules being 5 mm. long with 1 1 er 1 2 iegments. 2°d Suborder MACR< IPHREATA. I. Family Antedonedai Norman (emended). Key to the Subfamilies of the Family Antedonidae. a1 Cirrus sockets arranged in definite columns on a conical or columnar, usually large, centrodorsal . . Zen ome tri nac a Cirrus sockets arranged in transverse alternating rows, or irregularly, on a hemispherical to discoidal or conical centrodorsal bl the segments of the genital pinnules are much expanded, forming a roof over the gonads Isometrin ae h the segments of the genital pinnules are not expanded c1 P, is composed of numerous (usually more than 50 and never less than 30) short segments of which at least the llrst six or seven, and usually nearly all. are broader than long, and the distal are rarely more than twice as long as broad; 1', is as, or lonsjer than, 1\ d1 pne or more of the following pinnules resembles Pj . . H el i o m etri n ae d P and the following pinnules are composed of segments which, beyond the third or fourth, are much elongated. . Thysanometrinae c2 P, is composed for the most part ol much elongated segment'-. thorn/h a few of the basal segments mav be short: the distal segments are at least twice as long as broad d1 the distal cirrus segments are entirely without dorsal pro- cesses on their distal ends; the cirri are usually (but not always) short, rarely with more than 20, never with more than 30, segments Antedon in ae d the distal cirrus segments always have the 'listal dorsal edge prominent, with the median portion more or less produced in the form of a dorsal spine, and the middorsal line more or less strongly carinate I' resembles P,. and always differs trom the genital pinnules; ]', is freguently, and 1', occasionally, absent . Perometrinae 197 e3 P„ resembles P„ and the succeeding pinnules, and often bears a more or less developed gonad ; all of the lower pinnules are invariably present Bathymetrinae ist Subfamily Antedoninae A. H. Clark. Key to the Genera of the Subfamily Antedoninae. a1 P2 of the same length and character as P., and the following pinnules, and much shorter than (usually about half as long as) P, b1 pinnule segments with unmodified, or at the most very finely spinous, distal edges-, size medium, the arms rarely under 45 mm. in length (Norway to the Gul f of Guinea, including the ent ir e Medi- terranean basin and the east Atlantic islands; Caribbean Sea to Rio de Janeiro, Brazil; o — 445 Me tres) Antedon b3 pinnule segments with strongly produced, everted and coarsely spinous distal edges ; size small, the arms never over 70 mm. and rarely over 45 mm. in length (southern coasts of Australia northward throughout the East Indian region to southern Japan; o — 275 Metres) Compsometra a3 P, not of the same length and character as P, and the followine pinnules, and never only half as long as PT b1 P., of the same length and character as the following pinnules; P„ much \J^ lonoer than P, , resemblingf P which is still longer c1 Pj longer than the cirri, becoming very slender and flagellate distally, composed of about 40 segments (Ceylon to the Society Islands ; o — 47 Metres) . . Mastigometra c3 Pj shorter than the cirri, less slender and more or less stiftened, com- posed of 18 — 21 segments (Moluccas to China, end eastward to the Society Islands; o — 397 Metres) Euantedon b3 P., not of the same length and character as the following pinnules c1 P3 much the longest and stoutest pinnule on the arm d1 the distal ends of the cirrus segments do not overlap the bases of those succeeding; the dorsal edge of the outer four to six cirrus segments is about as long as the proximal border; the brachials have strongly produced and coarsely spinous distal edges (F lor es to Borneo and the Philippine Islands: o — 502 Metres) . Toxometra d3 the cirrus segments have produced distal ends which overlap the proximal ends of those succeeding; the outer cirrus segments are much longer than their proximal width ; the branchials have smooth, or only very finely spinous, distal edges e1 smaller, with not over 16 cirrus segments; cirri less numerous, |.,S XX— XI V rarely over XL . arms 2;, mm. to 50 mm. long trom the Red Sea to Madagascar and Mauritius, stward to northern Australia and the Easl lndi< and northward t«> southern Japan; o 106 Metres Dorometra with 16 — 33 cirrus segments; cirri more numerous, XXXV— LX (rarely less than XL- arms 75 mm to 80 mm. long Lesser Sunda Islands to the Philippines; 69 — 140 Metres) Eumetra 1 not much the longest and stoutest pinnule on the arm d1 1' , P, and 1' similar and of approximately equal length, with at least 1 .; segments e1 1' . I' and I' longer than the genital pinnules; the pinnules are m>t especially stiffened, and thëir component segments do not bear prominent spines on the distal edges; the centrodorsal is low hemispherical (Philippine Islands to southern Japan; 2 3 — I9o | -v Metres) Iridometra e5 P,, P, and P. shorter than the genital pinnules: all the pinnules slender and stilï, especially the lower which .are thorn-like, with long spines on the distal edges of the segments; the centro- dorsal is large, rounded conical (coast of Brazil; 41 Metres) Hybometra cl- Pa much longer than P, , and longer than Ps, though similar to the latter : centrodorsal more or less sharply conical (Andaman Islands to southern Japan; 54 — 201 [?25o] Metres) . . Andrometra Mastigometra A. II. Clark. Key to the Species of the Genus Mastigometra. Distal cirrus segments from one third to one half again as long as broad; arnv^ from 105 mm. to [20 mm. long;'cirri XXXV — LXXX, 12 — 16, 1 2 mm. to 14 mm. long P, 25 mm. long with 41 ents; I', 16 mm. long with 35 segments; 1' [O mm. to 12 mm. long with 25 segments (locality unknown). . flagellifera \, P, [5 mm. Ion- with 30 segments; Ps 10 mm. long with 24 segments; 1' 7 mm. long with 13—15 segments (Tahiti; littoral) pacifica ind following cirrus segments ahout as long as broad; cirri L — XC, 16, in mm. long: arms probably about 80 mm. Ion- (Ceylon; 0—47 micropoda 1. Mastigometra flagellifera .V II. 1 lark. A. II. Cl vi . Riol. Soc Washington, vol. 21. [908, p. 229 {Mastigometra flagellifera) 199 2. Mastigometra pacifica nov. sp. The centrodorsal is very flat, almost discoidal, with a large flat dorsal pole 2 mm. in diameter; the cirrus sockets are arranged in two and a partial third alternating marginal rows. The cirri are about XXXV, 12 — 16 (the longest usually 14 — 16), 12 mm. to 14 mm. long, in general appearance strongly suggesting those of Antedon petasus ; the first segment is very short, the second about twice as broad as long, the third nearly as long as broad, the fourth slightly longer than broad, the fifth the longest, from one third to one half again as long as the median diameter, the tollowing of about the same proportions; from the fourth or fifth segment onward the cirrus in lateral view increases slowly in diameter so that the outer portion, which is rather strongly recurved, is nearly twice as broad as the proximal; the opposing spine is minute; the terminal claw is nearly as long as the penultimate segment, stout and strongly curved. The earlier cirrus segments have a slight central constriction ; the outer in lateral view have a quite straight dorsal, and a nearly straight ventral, profile. The distal border of the radials is even with the rim of the centrodorsal. The IBrx are very short, from five to six times as broad as long, with the distal and proximal edges parallel and the lateral edges slightly convergent, making an angle of about 900 with those of the adjacent IBrp the perisomic area thus exposed being entirely covered by a conspicuous group of perisomic interradials. The IBr., (axillaries) are triangular, half again as broad as long, with the anterior angle somewhat produced. The brachials resemble those of the other species of the genus ; the distal edges are slightly produced and finely spinous. Syzygies occur between the third and fourth brachials, again between the ninth and tenth and fourteenth and fifteenth, and distally at intervals of three oblique muscular articulations. The arms are 105 mm. long, becoming extremely slender and attenuate distally. Pj is 15 mm. long, composed of 30 segments of which the first is broader than long, the second half again as long as broad, and the third and following are twice as long as broad, becoming longer in the distal half; from about the fifth onward the segments have overlapping and prominently spinous distal ends. The pinnule is considerably stouter basally than P., and the succeeding pinnules, but becomes exceedingly attenuated and flexible in the distal half. P3 is 10 mm. long with 24 segments, more slender than FY with relatively longer segments which have more prominently spinous distal ends. P., is 7 mm. long with 13 — 15 segments, tapering more gradually than P., and hence appearing stouter, and without the long flagellate tip. Pi apparently resembles P3, but is somewhat shorter. This species is described from two specimens from Tahiti, Society Islands, in the Zoolo- gical Museum (Staatssammlung) at Munich; they were part of the lot including the specimens upon which Euantedon tahitiensis is based. \. II. (."huk. A. II. I . U.S. National Museum, \"!. | i, i . i, p. 64 1 Mast, rometra microp • the [ndian Ocean, 1912, p. 22y, fig. 42, p. 228 {Mastigometra microp, Euantedon A. II. ('huk. K' \ in the Species of the Genus Euantedon. .1 More than 20 cirrus segments; cirri XL, :: - 25, 15 mm. t < » 20 mm. long; 1' 7 5 mm. long with 10 -|- segments; 1' '> mm. long with 10 segments; 1' 4.^ mm. long with ii segments; arms 100 mm. long (Tahiti; littoral) . . tahitiensis a Li »s than 20 1 g 17 cirrus segments ngest firrus segments about tour times as long as the median diameter; after the eighth the cirrus segments decrease in length so that the antc- nultimate is little, if any, longer than broad; the cirrus segments have a straight dorsal and ventral profile, and the ends are not swollen (Moluccas; 7 Met r es) moluccana ng -i cirrus segments from two to two and one half times as long as broad; the proximal and distal cirrus segments are subequal in length; both the proximal and distal ends of the segments are thickened and prominent (Pcoast of China; Plittoral) sinensis 1. Euantedon tahitiensis nov. sp. The centrodorsal is very low, with a relatively large slightly convex dorsal pole 1.5 mm. in diameter; the cirrus sockets are arranged in about three closely crowded more or less irregular alternating rows. The cirri are XL. 22—25. '5 mm- to 2° mm- 'ong; tne m'st segment is very short, the- second about twice as broad as long, the third about as long as broad, the fourth not twice a as the median diameter, the fïfth slightly longer, the sixth and seventh the :i two and two and one hall' time-, as long as the median diameter; the following very slowly decrease in length, the fourteenth or fifteenth and those succeedin^ being usually from one third to mie hall" again as long as the median diameter, though sometimes only slightly longer than broad: the segment preceding the antepenultimate and the antepenultimate longer again, aboul tuier- as Ion- as broad: on the segments as far as the eighth both thi ' and ventral profiles are equally concave, so that the articulations are prominent; i onward the dorsal profile becomes progressively more and more concave, and the ventral less and less, so that the segments beyond the twelfth or thirteenth have the ventral ■ approximately straight, and the dorsal very strongly and narrowly concave so that both ends of the segments <>n th<- d ipear very prominent; the opposing spine >mall, terminal <>r subterminal, directed ly forward; the terminal claw is slightly than the penultimate segment, moderately curved. .tal border of the radials projects slightly beyond the rim of the centrodorsal. 201 When viewed at right angles to the plane of their dorsal surface the IBr1 appear oblong, about four times as broad as long; when viewed at right angles to the dorsoventral axis of the animal the me.dian length appears to be about one third less than the lateral. The IBr0 (axillaries) are rhombic, half again as broad as long, the anterior angle sharp, the posterior process very broad and obtuse ; the anterior borders are moderately concave ; the proximal are straight e'xcept just before they reach the lateral border where they turn to a hprizontal direction and then curve slightly dornward, fitting snugly around the rounded distal angles of the IBrr The elements of the IBr series and the first two brachials are in very close lateral apposition and are more or less sharply flattened against their neighbors. The arms are ioo mm. long. The first brachials are wedge-shaped, three times as long exteriorly as interiorly, the inner borders in close contact. The second brachials are of nearly the same size and shape, slightly larger ancl more irregular. The first syzygial pair (composed of the third and fourth brachials) is slightly longer interiorly than exteriorly, twice as broad as long. The following brachials as far as the second syzygy are irregularly wedge-shaped, about three times as broad as long, those beyond the second syzygy triangular, somewhat broader than long, soon becoming wedge-shaped, slightly broader than long, and distally wedge-shaped, about as long as broad, and terminally longer than broad. Syzygies occur betvveen the third and fourth, ninth and tenth and fourteenth and fifteenth brachials, and distally at intervals of three oblique muscular articulations. Pj 7.5 mm. long, composed of 10 -f- segments of which the first is twice as broad as long, the second is slightly longer than broad, the third is half again as long as broad, and the following are twice as long as broad, becoming three times as long as broad distally; the third and following have rather prominent distal eads which are armed with fine spines, at first only on the distal border (away from the ventral surface), later all around. The pinnule is markedly stouter than those succeeding, and somewhat stiffened. Pa is 6 mm. long with io segments, resembling Fl but more slender with proportionately longer segments distally. P3 is 4.5 mm. long with 1 1 segments, smaller, more delicate, and less stiffened than P2. The distal pinnules are from 8 mm. to 9 mm. long, very delicate, composed of 20 — 21 segments. This species is described from two specimens from Tahiti, Society Islands, in the Zoölogical Museum (Staatssammlung) at Munich. 2. Euantcdon moluccana (A. H. Clark). A. H. CLARK. Notes from the Leyden Museum, vol. 34, 19 12, p. 129 {Antedon moluccana). Stat. 139. o°ii'S., i27°25'E. Molucca Passage. 397 Metres. 1 Ex. The centrodqrsal is low hemispherical, the bare dorsal pole 1.5 mm. in diameter, very slightly convex, with an obscure broad median tubercle surrounded by obsolete cirrus sockets. The cirri are about XXX, 15 — 17 (usually 17), slender and delicate, the longest about SIBOGA-EXrELllTIE xi.ii/-. 26 mm. hm"; the first segment is very short, the second from one half again to twice as long the median diameter, the third from two and one half to three times as long as the median diameter, the'fourth and following about four times as long as the median diameter; after the hth the segments slowly become shorter so that the antepenultimate is little, if any, longi than broad; the penultimate segment is small, wedge-shaped, aL.ua half the size of the ante- penultimate; the opposing spine is small, subterminal; the longer earlier segments are moderately nstricted centrally, with expanded and slightly overlapping ends; the shorter terminal liave straighter dorsal and ventral profiles so that in lateral view the cirri appear to broaden just at the tip; there may be a slightly marked transition segment at about the eighth. The distal border of the radials is even with the rim of the centrodorsal. The IBr are very short, about tour times as broad as the lateral length, which is about twice the median length; the lateral edges are concave; they are just in apposition basally. but diverge trom each other in the angles of the calyx at an obtuse angle of about 1 200. The ll'.r (axillaries) are slightly broader than long, very widely separated; the 'lateral are about as long as those of the ll>r.. concave, diverging outward at approximately a right angle to each other; the anterior sides are approximately at right angles to each other, nearly straight; the anterior angle is only very slightly and broadly produced; a rounded median • rior projection incises the IBr,. The arms are all broken; the size appears to be about that of an average Antedon literranea. The first brachial is very short, twice as long exteriorly as interiorly, the median length about the same as the internal; the proximal third of the inner borders are united, but the distal two thirds diverge almost in a straight line. The second brachial is much larger, irregularly quadrate. The structure of the arms is essentially the same as that of Antedon mediterranea. P, is from 13.5 mm. to 16 mui. long, composed of [8 21 segments, moderately slender and tapering evenly from the base to the delicate tip; the ftrst segment is not quite so Ion- as broad. the second dei slightly in diameter distally and is about as long as the proximal diameter, the third is between two and one half and three times as long as broad, and the following are somewhat over three times as long as broad, becoming more elongate distally: the segments have the whole surface ver) finely spinous, and the outer have very finely spinous di^tal ends; the articulations are very slightly swollen. I' is similar to 1',, but is nol quite so long. 1' i-, 7 mm. long with 14 15 segments, much more slender than 1', but otherwise similar. 1' is 5 mm. long with 1 1 segments, slender and weak, all but the two basal segments much « ted. 1' is 5 mm. long with 10 segments, slender and weak. similar to I\. luit more slender yond the third segment. 1' is )) mm. long with 1 ; segments, slightly stouter than P, with slightly shorter segments. 1' is 7.5 mm. long with 14 segments, similar to 1'. but the component segments are 'ntly shorter with more expandi I ends. 3. Euantedon sinensis A. H. Clark. A. H. Clark. Smithsonian MisceIlan«ous Collections, vol. 60, 1912, N° 10, p. 31 {Euantedon sinensis). Antedon de Fréminville. Key to the Species of the Genus Antedon. 1 8 or more cirrus segments, a'.l of vvhich are long, the distal differing but slightly from the proximal: the distal portion of the cirri is not compressed laterally so that the cirri appear of the came diameter throughout; no perisomic interradials in the angles of the calyx; arms slender and very long, the proximal triangular brachials being considerably longer than broadv Vèrx long, not more than three times as broad as long, regularly oblong or slightly trapezoidal, the lateral edges making usually a straight line, more rarely a broadly obtuse angle, with those of the IBr2 (axillary) b1 usually 18 — 20 cirrus segments (from Malaga northe as t wa rd along the coasts of Spain and F ra nee to Italy, the nee southward to Sicily; Aegean Sea) mediterranen, \y usually 24 — 28 cirrus segments (Adriatic Sea) adriatica 1 7 or fevver cirrus segments (more than 1 5 only in exceptional cases) of which the proximal are long, but the distal, which are more or less compressed laterally, are shorter, usually about as long dorsally as broad, and broader, usually twice as broad, in lateral view ; interprimibrachial plates usually prominently developed in the angles of the calyx ; arms comparatively short and stout, the proximal triangular brachials being usually noticeably broader than long, never longer than broad; IBi^ short, the length rarely so much as one third of the width, much narrower distall)' than proximallv, so that the lateral angles of the axillaries project beyond the distal angles of the IBr1 b1 cirri increasing in lateral diameter very gradually, the distal portion being not greatly different from the proximal ; shortest outer cirrus segments measuring along their dorsal profile one third to one half more than their lateral diameter c1 Pj with more than 25 segments (coasts of Ireland, southern Scotland and England [except the North Sea], the Channel Islands, and southward to Cezimbra, Portugal). . . . bifida c2 Pj with less than 20 segments (G u 1 f of Guinea, from Wapoo, Ivory Coast, eastward to II ha das Rolas, off the southern coast of Sao Thomé) ' luipferi b3 outer cirrus segments strongly compressed laterally, so that the cirri are in lateral view nearly or quite twice as broad distally as proximallv ; longer proximal segments half again to twice as long as the median diameter; shorter distal segments as long dorsallv as broad proximallv cirri usually more than XL: interradial perisomic pli usually inconspicuous or undeveloped I aroë and Shetland Is lands, Norway, western Sweden and Denmark, and northern S otland, extending southward in deep water to the uthern coasts o( England and Ireland; absent from the Norl 5 />< tasus small; arms less than 60 mm. in length; cirri less than XXXV' centrodorsal ver) low, evenly convex, with very sloping sides; dorsal pole very small. from one third to one half of the diameter of the •entrodorsal : arms 30 mm. te. 4.1 mm. long (St. Thomas, Danish West In. lies, southward to Rio de | a n e i r o . Brazil) . dübenii centrodorsal thin discoidal, the large flat dorsal pole being in width more than two thirds of the basal diameter of the centrodorsal; arms usually about 60 mm. long (from Corsica and Sicily westward along the northern coast of Africa to Tan- gier, and southward to Senegal, in cl 11 ding the Azores, Madeira, and the Canary Islands) moroccana Compsometra A. H. (.huk. Ke\ to the Species of the Genus Compsometra. a1 Cirri about one third of the arm length, exceedingly slendcr and delicate, almost hair-like, ver) slightly rec.urved, the earlier segments with greatly swollen arti- culations, those in the distal fourth gradually decreasing in diameier so that the cirrus ends in a sharp point; no opposing spine; arms 20 mm. to 40 mm. long; cirri X — X \ II. 12 — 16, 7 mm. to 11 mm. long; 1', 3.5 mm. to 4 mm. long with o -11 segments; 1'., i.- mm. long to 1.7 mm. lOIli"' with 7 segments 1 lores to the Moluccas; o — 95 Metres) longicirra 1 irri short, not over one fifth of the arm length and usually less, stouter, in lateral view increasing in diameter in the distal half, with the outer segments much shorter than the elongate earlier segments, nevcr more than twice as long broad and usually much shorter; au opposing spine is alwavs present IV cirri short, about one ninth of the arm length, composed of short segments oi uhich the longest proximal (the fourth and fifth) are about half again as long as the median diameter and the last three preceding the penultimate are about as long as broad, or even broader than long; in the outer half the cirri are strongly recurved and the segments are strongly constricted laterally so that in lateral view this part of the cirri appears about twice as broad as the proximal; centrodorsal discoidal with a very broad hare dorsal [.■■Ie nearly or quite 2 mm. in diameter; cirri X XXIV XX XVI, 9 — 12, ually 10. 7 mm. long; arms 6omm. to 65 mm. long (from Port Jackson, 205 New South Wales, s o u t h ward and westward t o K o o m b a n a Bay, south western Australia; o — 18 Me tres) bicommoda \y cirri longer, from one seventh to one fourth of the arm length, with löngèr segments of which the longest proximal are at least twice as long as the median diameter and the two preceding the antepenultimate are markedly longer than broad, and often elongated; centrodorsal low hemispherical or low conical, never discoidal, always with strongly sloping sides and a moderate to very small dorsal pole c1 cirrus segment preceding the antepenultimate three times as long as the median diameter, or longer; cirri slender and delicate, almost as delicate as those of longicirra, with not more than 10 segments of which the proximal are about three times as long as the diameter of the much swollen ends, and the antepenultimate is about twice as long as broad ; all the cirrus segments have greatly expanded distal ends, this becoming less marked distally; arms 15 mm. to 35 mm. (rarely more than 20 mm.) long; cirri with 8 — 10 (usually 8 — 9) segments, 4.0 mm. to 4.5 mm. long; Pj with 10 — 12 segments; P„ about half as long, with 7 segments (Ti mor and Flores to the Moluccas, Celebes and the Sulu Archi- pelago; o — 275 |?40o] Me tres) parvijlora c3 cirrus segment proceding the antepenultimate not more than twice as long as the median diameter, and often much shorter, cirri less slender, with not less than 10 segments of which the outer have the distal ends slightly, or not at all, expanded d1 cirri rather stout and very strongly recurved in the outer three fourths; antepenultimate cirrus segment as long as, or very slightly longer than, broad; P1 8.5 mm. long with 17 — 18 segments; P2 4.0 mm. long with 11 segments; arms 45 mm. long cirri XXX, 10 — 12, 8 mm. to 9 mm. long (Moluccas; 45 Me tres) iris d2 cirri more slender, and less strongly recurved in the outer portion ; antepenultimate segment markedly longer than broad, usually about twice as long as broad; P: with not more than 15 segments; arms 30 mm. to 70 mm. (usually 30 mm. to 45 mm.) long; cirri XV — XXX, 12 — 14, 7 mm. to 8 mm. long e1 pinnule segments with extravagantly developed everted and spinous distal edges (T o k y o Bay, Japan, and southward t o F o r- mosa; 14 — 63 Metres) serrata e2 pinnule segments with moderately everted and spinous distal edges (southern Australia, and northward t o the Dampier Archipelago on the west and Flinders Island [140 io'S.j on the east; o — 9 Metres) . lovèni i. ra A. II. Oark. \. !l. I kRK. the Leyden Museum, vol. 34, t mm. long, and exceedingly slender; the brachials elongate, slightly constricted centrally, this condition increasing distally, and practically oth, with no production of the distal edges. Syzygies occur between the third and fourth brachials, again between the ninth an I tenth and fourteenth and fifteenth, and distally al intervals of I lique muscular articulations. 1' is from 3.5 mm. to \ mm. long, and tapers evenly from the base to the tip; it is composed of 9 -11 segments of which the firsl is twice as broad as long, the second half oad, the third twia one as broad, and the remainder from two and 2o; one half to three times as long as broad ; the third and following have produced overlapping spinous distal edges vvhich are most developed along the distal side. P, is from 1.5 mm. to 1.7 mm. long, much smaller and more slender than P1 though with similar segments, of which the first is short, the second slightly longer than broad, the third twice as long as broad. and the remainder elongated. P3 is similar to Pa but very slightly smaller, with only a very slight production of the distal dorsal edges of the segments. The distal pinnules are from 2 mm. to 4 mm. long, and extremely slender. 2. Compsomctra parviflora A. H. Clark. A. H. CbARK. Notes from the Leyden Museum, vol. 34, 1912, p. i$?,{Compsometra parviflora). Stat. 50. Bay of Badjo, western coast of Flores. Reef. 42 Ex. Stat. 65a. 7°o'S., I20°34'.5E. South off Saleyer. 120 — 400 Metres. 3 Ex. Stat. 99. 6°7'.5 N., 12026' E. Anchorage off North Ubian. 16 — 23 Metres. 1 Ex. Stat. 105. 6°8'N., 1210 19' E. Sulu Archipelago. 275 Metres. 1 Ex. Stat. 125. Anchorage off Sawan, Siau Island. 27 Metres. 2 Ex. Stat. 240. Banda. 9 — 36 Metres. 1 Ex. Stat. 289. 9°o'.3S., I26°24'.5E. Timor Sea. 112 Metres. 1 Ex. The centrodorsal is flattened hemispherical, very low, bearing two irregular rows of cirrus sockets. The cirri are XV — XXV, 8 — 9 (usually 8), 4 mm. long, exceedingly slender, the much elongated segments with greatly expanded ends; the first segment is about twice as broad as long, the second from two to two and one half times as long as the diameter of the expanded distal end, the third and fourth the longest, about three times as long as the diameter of the expanded distal ends; the following decrease slowly in length so that the antepenultimate is about twice as long as the diameter of its expanded distal end, and the penultimate is from one third to one half asain as long as broad; the stront constriction of the middle of the segments decreases in amount distally; the opposing spine is terminal, prominent, in height reaching nearly half the distal diameter of the penultimate segment; the terminal claw is about as long as the penultimate segment, rather stout, strongly and evenly curved. The distal borders of the radials are even with the rim of the- centrodorsal ; their distal angles are slightly separated. The IBrj are about three times as broad as the lateral length, which is twice the median length ; the lateral edges converge slightly, and are widely separated from those of their neigh- bors; the lateral portion of the proximal and distal edges is sometimes slightly thickened. The IBr., (axillaries) are rhombic with the lateral angles truncated, twice as broad as long, widely separated from their neighbors. The 10 arms are from 15 mm. to 20 mm. long, and slender; the brachials have somewhat prominent very finely spinous distal ends; syzygies occur between the third and fourth brachials, again between the ninth and tenth and fourteenth and fifteenth, and distally at intervals of three oblique muscular articulations. Pj is from 2.3 mm. to 3.5 mm. long with 9 — 10 segments of which the first is twice a tewhat longer than broad, the third two and one half times as long as the proximal diamei id the following three times as long as the proximal diameter; the third and following have prominently expanded and overlapping distal ends which are ially prominent o side of the pinnule where they are armed with long and ninent spines. I' is about half as long as Pn with 7 segments which an very long with strongly everted spinous distal ends. especially on the distal side; a large genital gland runs from the base ol the third to the base ol the sixth segment. Similar genital elands occur on the following pinnules to and including 1' llit - la from Stat. 99 resembles that trom Stat. 289. The individual from Stat. 105 lias u> cirrus segments. two from Stat. 125 resemble those described from Stat. 50; the arms are 25 mm. long; the cirri are 1 5 mm. long with 9 segments; there is no genital gland on 1' . The example hom Stat. 289 is large, with the arms 30 mm. long; the cirri are 6 mm. Ejments; 1', is trom 4 mm. to 4.5 mm. long, with i<> — 12 segments; there is no genital gland on Pa. The specimen from Banda is even larger, with the arms 35 mm. long; there are 10 cirrus segments. Compsometra incommoda (Bell). :. Arm. and Mag. Nat. Hist. [6], vol. 2, 1888, p. 404 {Antedon incomnu P. II. Carpenter. Proc. Roy. Soc. Victoria X. S.), vol. 1, 1889, p. 135 {Antedon sp. nov. BELL. Arm. and Mag. Xat. Hist. [6], vol. 3, 1889, p. 292 {Antedon incommoda; supposed identity with A. pstmila [= Compsometra lovêni\). A. II. CLARK. Proc. U.S. National .Museum, vol. 38, 1910, p. 275 {Compsometra lacert ■ Fauna Südwest-Australiens, vol. 3, 1911, Lief. 13, pp. 442, 443. 444, 464, mpsometra incommod Memoirs of the Australian .Museum, vol. 4, iyii, p. 792 {Compsometra incommo - Pi 5. National Museum, vol. 43, 1912, pp. 382, 405 {Compsometra incommoda). Smithsonian Miscella Collections, vol. 6i, iyi 3, X" 1 ;, p. 52 Compsometra incomnu 4. 1 metra iris A. H. Clark. A. II. Cl \::k. Notes from the Leyden Museum, vol. 34, 1^12, p. 131 {Compsometra ir/'s). . 144. Anch north of Salomakiëe (Damar) [sland. 4; Metres. 1 Hx. The centrodorsal is very low hemispherical, the bare polar area almost covered with pits representing obsolete cirri kets. The cirri are XXX. to [2, 8 mm. to 9 mm. long, the outer portion strongly recurved ; the first segment is ver) >hort, the about twice as long as the median diameter, the third about three times as l( the median diameter, the fourth about as long as the third; the following graduall) in length so that the antepenultimate is sligtly longer than broad, and the penultimate about as long as broad; the second and third are strongly Lricted centrally with expanded ends; the following gradually lose this character and become illy flattened and hence broader in lateral view, the outer segments being nearly <>r quite 209 twice as broad dorsoventrally as the proximal: opposing spine large and prominent, triangular, arising from the entire dorsal surface of the penultimate segment, directed obliquely forward. The distal borders of the radials are even with the rim of the centrodorsal ; the IBrj are short, almost entirely divided in the median line by the posterior process of the axillarv, well separated interradially, not in contact basally. The IBr3 (axillaries) are rhombic, all the sides strongly concave, about as broad as long, vvidely separated from their neighbors. The 10 arms are 45 mm. long; they resemble those of C. serrata, but the distal edges of the brachials, while overlapping and spinous, are much less conspicuously and more hnely spinous, and lack the strongly marked longitudinal ridges running inward from each of the spinous processes. Syzygies occur between the third and fourth brachials, again between the ninth and tenth and fourteenth and hfteenth and distally at intervals of three oblique muscular articulations. Pj is 8.5 mm. long, moderately slender, composed of 17 — 18 segments of which the hrst two are broader than long, the third is about twice as long as the median breadth, and the remainder are approximately three times as long as broad, and somewhat longer distally ; the third and following have slightly projecting and overlapping distal edges, this increasing distally. Pa is much smaller and more slender than Px, 4 mm. long with 1 1 segments of which the first two are short, the third is half again as long as broad, and the following rapidly become elongated ; the segments have moderately produced spinous overlapping distal edges. P„ is from 3.0 mm. to 4.5 mm. long with about 11 segments; it tapers less rapidly than P, and thus appears stouter, especially distally. Pi is similar to P„, but slightly longer and slightly stouter. The distal pinnules are very slender, 7 mm. long with 16 — 17 segments which have slightly spinous distal edges. 5. Compsomctra serrata (A. H. Clark). A. H. CLARK. Buil. Mus. Comp. Zo<">l., vol. 51, 190S, N°S, p. 240, pi. 1, fig. 4 {Antedon serrata). Proc. Biol. Soc. Washington, vol. 21, 190S, p. 131 {Compsometra serrata). Proc. U.S. National Museum, vol. 34, 190S, p. 316 [Compsometra serrata). Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 192 {Compsometra serrata). 6. Compsometra lovcni (Bell). Wright. Proc. Roy. Irish Acad. [2], vol. 2, 1877, p. 754 (? Kallispongia arekeri). BELL. Proc. Zool. Soc. London, 1882, p. 534 {Antedon lovéni). "Alert" Report 18S4, p. 157, pi. 10, figs. B, Ba, b {Antedon pumila; based upon the same specimens as the preceding). Proc. Linn. Soc. New South Wales, vol. 9, 1885 [1884], p. 497 {Antedon pumila). P. H. Cari'ENTER. "Challenger" Reports. Comatulae, 1888, p. 56, paragraph 3 {Antedon lovéni; Antedon pumila). Bell. Ann. and Mag. Nat. Hist. [6], vol. 3, 1889, p. 392 {Antedon pmnila, part). Whitelec;ge. Journ. Roy. Soc. New South Wales, vol. 23, 1889, p. 197 {Antedon pumila). P. H. Carpexter. Proc. Roy. Soc. Victoria (N. S.), vol. 2, 1890, p. 135 {Antedon pumila). SIBOGA-EXPEPIT1E XLII#. 27 2 IO Ramsay. R ustralian Museum, vol. 1. 1890, p. 84 [Antedon pumila). A. II. Cl \kk. Proc. U S. National Museum, vul. 34, 190S. p. 481 [Antedon lov Proc i - al Museum, vol. 58, [910, p. 275 (Compsometra lo: Die 1 ' Lustraliens, vol. ;. [911, I ief. . pp. 442, 443, 444 [Compsometra metra • M. ■ the Australian Museum, vol. 4. 191 r, pp. 717, 718, J22, 735, 790 (Compso- Smithsonian Miscellaneous Collections, vol. 6l, [913, N" 13, p. 53 [Compsometra !<•■ \ II. Clark) from the Hawaiian Islamls 1 am now convinced does n0X i„.;,. is; its generic position is uncertain, but it appears to be closely nlated t,, the drometra. Andrometra A. 11. (huk. Key to tin- Species of the Genus Andrometra. a 1 arms about 60 mm. Ion-; cirri about LXX; I' 6 mm. Ion-' with 9 segments; 1' to mm. long with 15 segments; 1' S mm. long with 15 segments; P, like P,; 1' ; mm. long with 10 segments (Andaman [slands; 202 Metres). . . . indica ^maller, arms not over 55 mm. Ion-; cirri XXX — XXV, 15 — 16, 7 mm. long; 1' \ mm. long with S— 10 segments; P, 7 mm. long with 11 segments; P resem- bling 1'. but shorter, about as long as P, ; P, still shorter (southern Japan; ? 250] Metres) psyche 1. Andrometra indica A. II. Clark). A. H. CLARK. Crinoids of the Indian Ocean, 191 2, p. 243, fig. 46, p. 243 [Eumetra indica). 2. Andrometra psyche (A. II. Clark . A. II. Clark. Buil. Mus. Comp. Zool., vol. 51, 1908, N" 8, p. 241, pi. i, figs. 2, 3 [Antedon . S. National Museum, vol. 34, 1908, p. 317 [Iridometra psyi Toxometra A. II. (huk. The only in the genus Toxometra is 1. Toxometra paupera A. 11. Clark. A. II. Cl VRK. Proc. National Museum, vol. 39, 191 1, p. 560 [Toxometra paup, Notes from th 1 Museum, vol. 34, 1912, p. 1 38 (Toxometra purpurea). Stat. 79». 2°3.S._;S.. 11, 1 . Borneo Bank. 54 Metres. 2 Ex. Stat. rn side of the Pearl Bank, Sulu Archipelago. [5 Metres. 2 Ex. 5 X., [20 26 E. Anchorage off North Ubian. ió— 23 Metres. 2 Ex. Maumer l The larger specimen from Si I at first considered as representing a new species. It may be described as follows: 2 I I The centrodorsal is small, truncated hemispherical, the cirrus sockets arranged in three closely crovvded alternating marginal rows; the dorsal pole is small and papillose. The cirri are XXIV, 13 — 16, 10 mm. long, recalling those of Antedon petasus but smoother dorsally and more slender proximally; the first segment is short, the second slightly longer, the third as long as broad or slightly longer than broad, the fourth slightly longer than the third, the fifth and sixth the longest, twice as long as the proximal diameter; the following gradually become laterally composed and, though remaining actually of the same length, increase in lateral diameter and become therefore relatively shorter so that the last four before the penultimate are slightly longer than broad ; in the proximal portion te cirri are in lateral view slender, and rounded in cross section ; in the distal half they become strongly compressed and in lateral view about twice as broad as in the proximal half; there are 110 dorsal processes; the opposing spine is short, subterminal to subinedian, its base involving only a small part of the dorsal surface of the segment, in height scarcely one third the distal diameter of the penultimate segment, directed obliquely forward ; the terminal claw is somewhat longer than the penultimate segment, stout and strongly curved. The radials are just visible bevond the rim of the centrodorsal ; their distal anodes are separated. The IBrj are short about four times as broad as long in the median line, trapezoidal, widely separated interradially , the sides making an angle of nearly 1 200 with those of their neighbors. The IBr2 are broadly pentagonal; the anterior angle is approximately 900; the lateral edges are nearly as long as those of the IBi'j and make with them an angle of about 1 200. The synarthrial tubercles are rather prominent, and the elevation is continued somewhat anteriorly onto the axillary. The first brachials are short, over twice as broad as longf exteriorlv, the exterior lehath being rather more than twice as great as the interior; the inner edges are united basally, but distally diverge at a very broadly obtuse angle. The second brachials are about twice as large as the first, irregularly quadrate. The first syzygial pair (composed of the third and fourth brachials) is nearly twice as long interiorly as exteriorlv, the inequality falling chiefly in the hypozygal, twice as broad as long in the median line. The next four brachials are slightly wedge-shaped, twice as broad as the greater length, then becoming triangular, about as long as broad, and after the proximal quarter of the arm wedge-shaped, about as long as broad, and somewhat longer terminally. Syzygies occur between the third and fourth, ninth and tenth and fourteenth and fifteenth brachials, and distally at intervals of three oblique muscular articulations. Pj is 5.5 mm. long, composed of 15 segments of which the first is short, the second longer, the third nearly as long as broad, the fourth slightly longer than broad, and the seventh and following about twice as long as broad; the pinnule is small and slender, and tapers evenly from the base to a slender and delicate tip; there is a slight swelling on the distal edee of the second and third semnents. I' is 7.5 mm. long with 16 segments, resembling 1', but proportionately stouter; the distal ■ the third and following segments are slightly produced and finely spinous ; as in P, the dorsal edge of th( 1 and third segments is slightly thickened. 1' is 1 2 mm. t<> 13 mm. long with :: segments, resembling I' bul proportionately stouter. P i> 5.0 mm 5 mm. long with 14 segments, similar in size to P but with the distal segments ver) slightly shorter. 1' is 6 mm. long with 15 segments, slightly stouter than I', and not tapering so rapidly. i ie distal pinnules are 6.5 mm. long with 16 segments, very slender, the segments beyond the two basal much 1 ted. Thi ir in spirits is deep purple, banded with yellowish at the articulations; the r pinnu yellowish. The specimens from Stats. 70' and 99, and the smaller from Stat. 96, have an arm th of between 25 mm. and 30 mm.; that from Maumeri is large, but badly broken. Iridometra A. II. Clark. Key to the Species of the Gemis Iridometra. a ('in-i not slender. the longest segments rarely more than four times as long as the median diameter, with the articulations only very slightly enlarged; Pj and 1' with 16 — 19 segments; I', slighdy longer than 1', b1 Pj, 1' and 1' of approximately the same length (Ps slightly longer than I' . which is slightly longer than P,), with iS — 20 segments; cirri XL, 12 — 17 irely more than 15), 10 mm. to 12 mm. long; arms 35 mm. to 60 mm. long (sou-t hern Japan; 23 — 192 [^250] Me tres) adrestine b 1', and 1', of approximately the same length (P„ slightly longer than l\), with 16 segments, but P shorter with 13 segments; cirri XXX -L, 15 — 19 (usually 16 — 18), 10 mm. to 14 mm. long; arms about 50 mm. long (China - a, n e a r Hong K on g ; 158 — 180 Metres) melpomene a < irri exceedingly slender with greatly elongated segments of which the proximal are at least six times as long as the median diameter, with greatly swollen articulations; P, and P. similar, the latter usually slightly shorter than the former, with 1 1 — 13 segments; P smaller, with 8 — 9 segments, arms 40 mm. — 50 mm. long (Philippine Islands; 62 — 140 Metres) exquisita 1. Iridometra adrestine (A. 11. Clark). A. II. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, part 3, p. 340 Anti den adrestine); p. 341 \.\ntedon uiinitta). 2. Iridometra melpomene A. 11. Clark. A. H. CLARK. Proc. U.S. National Museum, vol. 39, 191 1, p. 359 [Iridometra melpomene). This species is infested with a curious amphipod parasite which bores into the disk, possibly the same as that mentioned by von Willemoes— Schm of which the specimens were subsequently lost. A detailed description of the form, by Mr Clarexci; R. Shoemakek, is now in press. 3. Iridometra exquisita A H. Clark. A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, p. 408 [Iridometra exquisita). Proc. U.S. National Museum, vol. 39, 191 1, p. 559 (Iridometra exquisita). The original specimen upon which this species is based is small and probably immature. The long Pj and the rather unusually spinous condition of the distal ends of the pinnule segments suggest a comparison with the small species of Compsometra ; but the relatively large P3 shows that it cannot be referred to the genus. The specimen recorded in 191 1 (Cat. N° 36024 U. S. National Museum) appears to be a more developed individual of the same species; the arms are about 50 mm. long, and the cirri are 11 mm. long; Pl is 5 mm. long, with 12 segments; P2 is also 5 mm. long, with 11 segments, similar to Px ; P., is 4 mm. long with 9 segments, proportionately shorter and more slender; P4 is similar, with 8 segments, nearly or quite as long; P6 is 4 mm. long with 10 segments. Eumetra A. H. Clark. Key to the Species of the Genus Eumetra. a1 Cirri very long and slender, from the third to one half of the arm length, composed of 25 — ^i, (usually 25 — 26) much elongated segments of which the longest are about five times as long as the proximal diameter, and the last three or four are about two and one half or three times as long as broad ; 110 opposing spine; terminal claw very slightly curved (Philip pin e Islands; 141 — 144 Me tres) chamberlaini a" Cirri shorter and less slender, about one quarter of the arm length, composed of 16 — 18 segments which are not especially long, the longest proximal (fifth-seventh) being nearly or epiite three times as long as broad proximally, and the last three or four less than twice as long as the distal breadth ; a prominent opposing spine; terminal claw strongly curved (Less er Sun da Islands; 69 — 7 3 Metres) aphrodite 1. Eumetra chamberlaini A. H. Clark. A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, 190S, part 2, p. 23 1 (Eumetra chamberlaini). - Proc. U.S. National Museum, vol. 39, 1911, p. 563 (Eumetra chamberlaini). 2. Eumetra aphrodite A. H. Clark. A. H. CLARK. Notes from the Leyden Museum, vol. 34, 1912, p. 137 (Iridometra [Eumetra] aphrodite). Sapeh Strait. 69 Metres. 124 -7 .3 i:. rimor - •! eti Ex. Xh( lemispherical, stout 2.9 mm. in diameter at the base, almosl completely 1 with cirrus ts; the small dorsa] pole is papillose, as in E. chamberlaini. The cirri are NXXV — L, i<> 18, 1 <> mm. to is mm. long; the first segment is v< short, iboul twice as broad as long, the third nearly or quite as long as the proximal diameter, the fourth from two to two and one half times as long as the proximal diameter, the ' enth the longest, nearlj or quite three times as long as the proximal diameter; ving very gradually decrease in length so ili.it the antepenultimate is from one third : half again as long as broad; the cirri are nol especially slender; they become mode- ompressed laterally in the distal half; the longer earlier segments have a slight central triction, and the shorter distal have the proximal dorsal angle cut away so that the distal il angle of the preceding appears prominent; all the segments have prominently overlapping distal ends; the cirri do not taper distally The division series and arm bases resemble those of E. chamberlaini; the distal inter- tl interval is three oblique muscular articulations. P, is 5.5 mm. long, composed of 1 1 or 12 segments of which the first is not quite as long as broad, the second is about as long as broad, the third is half again as long as broad, and the remainder are about twice as long as broad. The pinnule is slightly stiffened, and tapers evenly from the base to the tip. 1' is 7 mm. long with 15 segments of which the first is twice as broad as long, the second is nearly as long as broad, the third is half again as long as broad, and the remainder are about twice as long as broad. The pinnule is proportionately stouter than Pn and the outer segments have slightly prominent distal angles and slightly spinous distal edges. 1' is 10 mm. long with 19 segments, resembling P, but tapering slightly less rapidly and with the outer segments relatively longer. is trom 4.5 mm. to 5.5 mm. long with 10 — [3 segments, smaller than P.,, though similar to it. 1' is 6.5 mm. long with 14 segmei Th( pinnules are extremely slender, 8 mm. long with 1 7 segments. The arms are about 75 mm. long. Dorometra A. II. ('huk. Kej to the Species of the Genus Dorometra. a 1' resembling P, in size and in number of segments, or slightly smaller b1 cirr: nents relatively short, the longest about two and one half times long as broad, the penultimate and antepenultimate not more than one third again as long as broad; arms from 30 mm. to 45 mm. in length c1 P, with 18 — 20 segments, 6 mm. to 7 mm. long, slender and Bagellate; .5 mm. long with 12 segment imilar bul slightly smaller, 2.7 mm. 2I5 long- with ii segments; P4 longer than P, and P, , 4 mm. long with [3 segments (Maclagascar and Mauritius; littor al) matiritiana c'2 P„ with 13 segments, 8 mm. long, less slender; Pl and Pn equal, 4.5 mm. long with 10 segments; P4 shorter than Px and P3, 3 mm. long with 10 segments (Binongka; 54 Me tres) gracilis \r cirrus segments much elongated, with much expanded distal ends; arms from 23 mm. to 30 mm. long c1 P3 more than twice as long as Fl and Pg with much more numerous segments, 7 mm. long with 16 segments; P1 and P3 2.5 mm. long with 8 — 9 segments; cirri XXX — XL, 10 — 12 (Maldive Is la n ds to northern Australia, the Tonga Islands, the Philip pi nes and the Macclesfield Bank: o — 74 Met r es) na na c3 Pg not greatly longer than Vl and P2, 2.9 mm. long with 9 segments; Px and P3 2.5 mm. long with 7 segments; cirri XX, 12 — 14 (Korean Straits; 106 Me tres) briseis a2 P2 intermediate in size and in number of segments between Px and P.. b1 cirri not especially slender, the longest segments not more than about twice as long as the diameter of the expanded ends c1 Pj 3.2 mm. to 4 mm. long with 10 — 15 segments; P2 6 mm. long with 13 — 14 or more segments; P., 9 mm. to 10 mm. long with 17 — 19 segments; P^ 4.5 mm. long, or longer, with 13 segments; P. 4.5 mm. long with 12 segments; cirri XXXV — XL, 10 — 15; arms 50 mm. to 60 mm. long (Philip pi 11e Islands; o — 32 Metres) parvicirra c" Pj 5 mm. long with 8 segments; P2 9.5 mm. with 12 segments; P., 13 mm. long with 18 — 20 segments; P4 4.5 mm. to 5 mm. long; P. slightly longer; cirri XXV, 14 — 16 (usually 15 — 16), 13 mm. long; arms about 40 mm. long (S u ez B a y ; 1 8 Metres) aegyptica \y cirri excessively slender and delicate, the earlier segments about four times as long as the diameter of the expanded ends, the penultimate twice as long as broad; cirri with 11 — 12 segments, 9 mm. long; Pl 2 mm. long with 8 segments; P., 3.5 mm. long with 8 — 9 segments; P., 4.5 mm. long with 9 segments; arms 40 mm. long (Moluccas; 95 Metres). . . . clymene 1. Dorometra gracilis (A. H. Clark). A. H. Clark. Notes from the Leyden Museum, vol. 34, 19.12, p. 138 [Iridometra gracilis). Stat. 220. Anchorage off Pasir Pandjang, western coast of Binongka. 54 Metres. 1 Ex. The cirri are 7 mm. long, composed of 10 segments of which the third and fourth are the longest, two and one half times as long as the diameter of the greatly expanded distal ends, ancl the antepenultimate is one third again as long as broad. The arms, which resemble those of the other species of the genus, are 35 mm. long. 2l6 1' and 1'. are verj slender, 15 mm. loag, 1 imposed of to segments. 1' is 8 mm. long, nposed <>f 1; segments. P mm. long, composed of nts. I' is 1 mm. long with Ejments, and bears .1 md. Beyond the second the segments of these pinnules and spinous distal edges, which are especially prominent on the distal side. 2. Dorom \- II- Clark . A. II. < ! vrk. Proc. U.S. National Museum, vol. 40, 191 1, p. 40 (Iridometra mauritian P 5. National Museum, vol. 43. 191 2, p. 405 {Iridometra mauritiat Buil. du Mus. d'hist. nat, Paris, 1 4, p. 257 (Iridometra mauritiana). 3. . :ra nan i 1 lartlaub). M a' vt.i der Ksl. Leop.-Carol. deutschen Akad. der Naturforsch., vol. 58, . \' 1, p. Shap< I distally, and finally oblong and elongate. All the brachials are perfectly smooth, with no ornamentation of any kind. Syzygies occur between the third and fourth, ninth and tenth and fourteenth and fifteenth hials, and distally at intervals of two oblique muscular articulations. 1', is u tnm. long, very flexible and slender, composed of 35 40 short segments most of which are about as 1 broad with all the angles cut away and hence appearing rounded, those in the terminal third becoming slightly elongated; the articulations are enlai and the whole pinnule suggests a string of small beads. 1' is 5 mm. long with 12- 15 segments of which the first two are about as long as broad, and the fourth and following rapidl) become elongated, and very slender distall)-: the fifth, sixth and seventh segments ln-ar a large rounded genital gland; the following pinnules to P8 are similar, but the genital gland gradually moves nearer the base of the pinnule. on 1', extending from the third to the sixth segment. The distal pinnules are 12 mm. long with 20 segments of which the first is very short, almost band-like, the second is almost triangular, the third is about half again as long as broad, the fourth is about twice as long as broad, and the remainder become progressively elongated. Thi ir in spirits is yellowish white, with a large black spot on each side of each ygial pair; the inner half of the articular faces of the syzygies is also black. The specimen described is Cat. N° 22675 U. S. National Museum. 1. Coccometra nigrolineata nov. sp. II. L. Clark. Huil. U.S. Fish Commission for 1900 [1901], part 2, p. 235 {Antedon hagenii). HARTLAUB. Mem. Mus. Comp. Zool., vol. 27, 1912, N" 4, p. 385, pi. 9, fig. 13; pi. 15, fig. 3 {Antedon cubensis, part). A. II. Clark, in Hartlaub, tom. cit.. p. 389, pi. g, fig. 13 [Coccometra nigrolinecti "Albatross" Stat. 2138. i7°44'o; N.. 75°39'oo"W. (southeast of the southeastern point of Jamaica) ; 41 Metres. "Albatross" Stat. 2327. 23" 11 '4; N., 820 17 54 W. (off Havana, Cuba). 327 Metres. -Albatross" Stat. 2335. 23°io.V) X.. .82° 20' 21' W. (off Havana). 307 Metres. ■Albatross" Stat. 2341. 230ll'oo"N., 82°i9'o6"\V. (off Havana. i\~ Metres. -Albatross" Stat. 2354. 20 5 . 50 N., 86 234; W. eastern coast of Yucatan). 234 Metres. "Albatross" collection. Oft" Havana, without further data. -I ish Hawk" Stat. 6067. Mayaguez Harbour, Puerto Rico; Point del Algarrobo bearin- E. by ' 2 X., 53/4 miles distant (magnetic). 173 — 210 Metres. The centrodorsal is hemispherical or subconical, the polar area finely papillose with a rounded tubercle at the apex. Cirri XXX XL. 17 — 23 (usually 21 — 22 16 mm. to 18 mm. long; the first two segments are short, about twice as broad as long, the third is about twice as long as broad, the fourth-eighth or -ninth are greatly elongated, tour or five times as long as broad, and the following decrease rapidly in length so that the terminal six to eight are about as long as broad: the elongate proximal segments are somewhat "dice-box shaped" with swollen arti- culations; the shorter (.listal segments increase gradually in dianieter from the proximal to the distal ends, the latter slightly overlapping the I ucceeding segments: on the distal I the dorsal side of the perrultimate segment there is a very small opposing spine which 22 I in height does not reach a third of the diameter of the segment; the terminal claw is about as long as the penultimate segment, and is moderately curved. There are no basal rays. The radials are only visible in the interradial angles. The IBrj are very short with a concave anterior border which in the median line nearly reaches the straight posterior border. The IBr., (axillaries) are roughly rhombic with a rounded posterior prolongation; the anterior angle is sharp and greatly produced. The IBr series are normally just in apposition laterally, but are not laterally flattened. The 10 arms are probably between 50 mm. and 60 mm. long. The first brachial exteriorly is about half as long as broad, but becomes reduced almost to a point interiorly, and is deeply incised in the median line by the considerably larger irregular second brachial. The first syzygial pair (composed of the third and fourth brachials) is wedge-shaped, much longer interiorly than exteriorly. The following brachials are rather short, after the twelfth, becoming more triangular, about as long as broad. The proximal brachials as far as the eighth have slight alternating lateral tubercles. The edges of the ossicles of the IBr series and the lower brachials are everted, prominent, and very spiny. Syzygies occur between the third and fourth, ninth and tenth and fourteenth and fifteenth brachials, and distally at intervals of two oblique muscular articulations. Px is 7.5 mm. long, slender, composed of 35 or more short segments, those in the proximal half about as long as broad with the corners cut away, those in the distal half becoming gradually somewhat elongated, the very slender terminal segments being about three times as long as broad. P, is 7 mm. long, considerably stouter and less flexible than Pn with about 15 segments of which the first three are about as long as broad and the following become elongated, the sixth over twice as long as broad and the terminal four or five times as long as broad. The following pinnules as far as P7 are similar, after which the pinnules become longer and more slender with the first two segments slightly enlarged, the first short, the second about as long as broad, the remainder elongated. The colour in spirits is white with a median line of black on the IBr series and the lower portion of the arms, beyoncl which each syzygial pair bears a transverse black band or large black spot; ventrally the disk is black, and the perisome of the arms is yellowish banded with black. The specimen described is Cat. N° 22674 U. S. National Museum. 2. Coccomctra hagenii (Pourtalès). Pourtalès. Buil. Mus. Comp. Zool., vol. 1, N" 6, 1868, pp. 105, 111, 125 (Comatula hagenii); N" 11, 1S69, p. 355 {Antedon hagenii); vol. 5, Nn 9, 1878, p. 214 (Antedon hagenii). P. H. Carpenter. Buil. Mus. Comp. Zool., vol. 9, 1881, N°4, pp. 154 — 156 (Antedon hagenii). VON GRAFF. Buil. Mus. Comp. Zool., vol. 11, 18S3, N" 7, pp. 128, 129, 132 (Antedon hagenii). A. AGASSIZ. Buil. Mus. Comp. Zool., vol. 15 ("Three Cruises of the 'Blake' ", vol. 2), 1888, pp. 124, 127 (Antedon hagen//). Hartlaub. Memoirs Mus. Comp. Zool., vol. 27, 1912, N° 4, p. 389, pi. 8, figs. 1 — 12; pi. 15, figs. 2, 6 (Antedon hagenii). Subfamily Zenometrinae A. II. Clark Key to the Genera of the Subfamily Zenometrinai .i P and 1' absent (Philippine [slands; 140 — 14S Metres) . . . Balanometra a I', and 1' preseni irri with all the segments elongated, the distal entirely uithuilt dorsal processes; or (very rarel) a few of the outermost cirrus segments may hut little longer than broad with slight dorsal tubercles cirrus sockets arranged in closely crowded columns in each radial area; hut the groups of columns in each radial area are usually (almost invariably) separated trom the groups of columns in the adjacent radial areas by long-triangular hare patches; the distal cirrus segments are always greatly elongated, never with any tracé of dorsal pro from the Galapagos Islands anti Pa- nanM northward to the Aleutian Islands, and south- ward on the A si at ie coast to Yezo Strait and the northern part of the Sca of Japan; the Hawaiian Islands; the Philippine Islands; the lesser Sun da Is- lands: the Bay of Hen gal and the coast of Travancore, and southward to the Antarctic regions; 336 — 2858 Metres) Psathyrometra columns of cirrus sockets somewhat irregular, and evenly spaced all around the centrodorsal without differentiation into radial groups; the distal cirrus segments may be much elongated with 110 tracé dorsal processes, or little, if any, longer than broad, with slight dorsal tubercles (from the western coast of Sc O t land, and I r e 1 a n d , southward t o Madeira, i n c 1 u d i n g the e n t i r e Medi terranean basin; 45 — 1292 Metres) Leptometra b 'irri with the proximal segments more or less elongated, but the distal segments short, never longer than broad, and bearing prominent dorsal processes c1 division series and arm bases smooth; 10 — 14 arms (Kei Islands and northern Cu ha: 252 380 Metres) Adelometra division serie, and arm bases spiny d1 size large; rirri with more than 40 (50 — 60) segments; columns of cirrus sockets very regular, separated interradially by high ridges, or by broad ban- areas e' two column, of cirrus sockets in each radial area. the radial areas being separated by high ridges drom St. Lucia. British West Indies, northward to Georgia and Pensacola, Florida; 304—792 Metn ■ Zenometra e2 three columns of cirrus sockets in each radial area, the radial areas being separated by broad bare areas (Hawaiian Islands; 346 — 633 Metres) Sarametra ds size small ; cirri with less than 30 segments ; columns of cirrus sockets on the centrodorsal slightly irregular; interradial areas on the centrodorsal not especially differentiated (Mar ion I s- land, and the shores of the Antarctic continent in the vicinity of Gaussberg; 252 — 400 Metres). . . . Eumorphometra Psathyrometra A. H. Clark. Key to the Species of the Genus Psathyrometra. a1 Centrodorsal very long, much longer than broad, rounded conical ; very distinct, though usually narrow, interradial lines running from the ends of the basal rays to the apex divide the sides of the centrodorsal into five radial areas, each of which contains three or four regular columns of cirrus sockets or from five to seven each; the proximal pinnules increase in length and stoutness to P;i, which is longer and stouter than the two preceding pinnules b1 four columns of cirrus sockets in each radial area c1 cirrus sockets very closely crowded, so that none of the lateral surface of the centrodorsal is visible between them; cirri about 45 mm. long, composed of 25 — 30 segments; arm length apparently about 100 mm., or rather more (Yezo Strait, Japan; 540 — 959 Metres) .... fragilis c3 cirrus sockets not crowded and not in apposition with their neighbors, so that narrow bands representing the lateral surface of the centrodorsal . are always visible between them; sometimes the four columns of cirrus sockets in the radial areas alternate small and lar^e, and occasionally there may be only three columns in some, very rarely in all, of the radial areas ; cirri about 40 mm. long, composed of 22- -25 segments; arm length about 80 mm. (sou theastern Alaska; 194 — 427 Metres). . . alascana b3 three columns of cirrus sockets in each radial area c1 larger, arm length about 130 mm.; cirri 55 mm. to 60 mm. long, com- posed of about 30 segments; cirrus sockets arranged in three regular columns, in contact longitudinally and usually also transversely (from Monterey, California, northward to the Shumagin Islands, and westward to the western Aleutian Islands; 1549- — 355 1 Metres) borealis c3 smaller, arm length about 80 mm.; cirri about 40 mm. long, composed of 22 — 25 segments; cirrus sockets less crowded, rarely in contact, usually arranged in four columns in each radial area (southeastern Alaska; 194 — 427 Metres) alascana 1 entrodorsal shorter, not longer than broad, usually conical, sharply pointed with straight sides I air columns of cirrus sockets in each radial area cirrus sockets ver) clos owded against each other; the twenty columi of cirrus sockets are closely crowded all around the centrodorsal, excepting only where the downward i oi the basal rays separates the mosl proximal sockets of the outermost columns of each radial area Hawaiian Islands; 720 900 Metres) congesta cirrus sockets widel) separated from each other, arranged in four, with metimes a partial fifth, columns in each radial area; narrow interradial lines divide the sides of the centrodorsal into five radial regions, tip of the centrodorsal truncated instead of sharply rounded as in the preceding Galapagos Islands and Panama; 693 — 000 Metres) .... bigradata nut more than thi umns <<( cirrus sockets in each radial area c1 size large; arms probably between 130 mm. and 150 mm. long; centro- dorsal large, a broadly truncated cone, with three complete and equal, ry closely placed, columns of tour or live (usually four) cirrus sockets in each radial area; relatively broad interradial lines, nearly as broad as the adjacent cirrus sockets, delimit the radial areas; \\, though similar to the succeeding pinnules, is longer and slightly stouter basally; the cirri are about 50 mm. long, composed of 35 — 40 segments (northern part <>f the Sea of Japan; 702 — 731 Metres) erythrizon r, the arms not over 100 m.m. long; centrodorsal a sharply pointed cone or a low hemisphere, never a broadly truncated cone; cirrus sockets arr in two columns in each radial area. or in two columns with a partial median column d1 cirrus sockets in two entire columns and one short and incomplete column in each radial area of the centrodorsal, the incomplete column between the two entire columns, which meet bevond it e1 larger, the centrodorsal being from 4 mm. to 5.5 mm. broad at the base and from 4 mm. to 5 mm. high, sharply conical; cirrus sockets very definite in arrangement, tin- interradial furrows very regular, broad. and well marked f' the incomplete median column of cirrus sockets consists of two sockets. with occasionally a more or less developed third; the. radial areas are delimited by deep grooves which are about as wide as the adjacent cirrus sockets; the centrodorsal is 5.5 mm. broad at the base. and measures 5 mm. along the sides (An- daman Sea to the Postillon Islands, north of Sum- bawa; .; ,1 Metres) major i the incomplete median column of cirrus sockets consists of a gracillima single socket; the radial areas are delimited by slightly sunken bare areas fróm half to quite as wide as the adjacent sockets; the centrodorsal is 4 mm. broad at the base and 4 mm. high (Postillon Islands to the Andamans, and northward to the Gulf of Martaban; 338 — 794 Metres) .... mira e2 smaller, the centrodorsal being not more than 3.2 mm. in basal diameter, rounded conical; the cirrus sockets are less definitely arranged f1 interradial furrows on the centrodorsal broad and distinct, from as wide as the adjacent cirrus sockets to as wide as the entire cirrus bearing portion of the radial areas; cirrus sockets very irregular in arrangement, but usually in two columns with addi- tional sockets toward the proximal border of the centrodorsal ; very slender; arms about 100 mm. long; cirri XL — L, 25, 35 mm. long (southwest of Akyab, Burma; 489 Metres) f- interradial furrows on the centrodorsal narrow and more or less obscure; cirrus sockets less irregular in arrangement, 7 — 9 in each radial area; centrodorsal very low, with rounded sides (Sumbawa to Ceram; 521 — 835 Metres) inusitata d~ cirrus sockets in two columns of from two to four each in each radial area; centrodorsal low, conical, with the tip slightly rounded e1 cirrus sockets regularly arranged f1 the ten columns of cirrus sockets of 2 (rarely 3) each are closely crowded, without segregation into radial pairs; arms about 80 mm. long; cirri XX, 26 — 31, 30 mm. to 45 mm. long (Antarctic regio ns, near Gaussberg; 2725 Metres) antarctica f2 the ten columns of cirrus sockets are segragated into five pairs which are separated by bare interradial spaces g1 radial areas. delimited by narrow irregular lines; 20 large cirrus sockets, four in each radial area, in two closely crowded columns; centrodorsal rounded conical, 1.7 mm. in diameter at the base, and about 1 mm. from the apex to the inter- radial border; P, bears a gonad (near Saleyer, south of Celebes;ii58Metres) anomala g2 radial areas delimited by prominent bare interradial spaces from half as wide as to as wide as the adjacent sockets h1 larger, the centrodorsal measuring 3.2 mm. across the base and 4 mm. from the apex to the interradial margin; bare interradial areas very regular, about as wide as the adjacent sockets; three or four cirrus sockets in each column (Phi- lippine Islands; 759 Metres) parva h2 smaller, the centrodorsal measuring 1.8 mm. across the base SIBOGA-EXPEDITIE yAA\b. . 29 and 1.6 mm. from the apex to the interradial margin; bare interradial areas very irregular, about half as wide as the Ijacent cirrus sockets (nofth <>t Sumbawa; 2060 Metr< minima e arrangement of the cirrus sockets more or less irregular, these being usually in two columns with additional sockets toward the proximal ntrodorsal; interradial furrows on the centrodorsal broad and distinct, trom as wide as the adjacent cirrus sockets to 3 the entire cirrus bearing portion of the radial areas ; \ slender; arms about roo mm. long; cirri XI. L, 25, 35 mm. long southwest of Akyab, 'Burma; 489 Me tres) .... gracillima 1. Psathyrometra fragilis (A. 11. Clark 1. A. 11. Clark. Proc. U.S. National .Museum, vol. 33, 1907, p. 80 [Antedon fragilis). 2. Psathyrometra alascana A. II. Clark. 1 'cscription in press.] 3. Psathyrometra borealis A. H. Clark. .\. II. CLARK. Proc. U.S. National Museum, vol. 34, 190S, p. 236 [Psathyrometra borealis); p. 237 [Psathyrometra profundorum). 1 4. Psathyrometra erythrizon (A. 11. Clark). A. H. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 79 [Antedon erythrizi 5. Psathyrometra bigradata (Hartla HARTLAUB. Buil. Mus. Comp. Zool., vol. 27, 1895, N' 4. p. 145, pi. 1, fig. 5 [Antedon bigradata). A. II. CLARK. Buil. Mus. Comp. Zool., vol. 51, 190S. X " s, p. J40 [Psathyrometra sp.). 6. Psathyrometra major A. H. Clark. A. II. ( LARK. Records of the Indian Museum, vol. 7, 1912, part 3. N" .:<>. p. 270 nomen nudum; "Investigator" Stat. 115, 188— 220 fathoms). rom the Leyden Museum, vol. 34, 1912, ]). 140 [Psathyrometra major). t. 45. 7 24 S.. 1 [8 rs'.2 E. I lores Sea. 794 Metres. 1 Ex. The centrodorsal is sharply conical with the apex slightly rounded, 5.5 mm. in diameter at the base and 5.0 mm. from the apex to the interradial horder; its sides are divided into five radial areas by five interradial furrows which are about as broad as the adjacent cirrus furrows are deeper and more V-shaped than those of Ps. mira. The cirrus emble those of Ps. mira, but the median incomplete column, instead of containing only a single socket, consists of two, with in two cases a more or less developed third • of the onter columns six contain three sockets, two four, and two two. Two cirri are preserved, one whole and one with a broken tip. These are 55 mm. lom-- and consist of 29 segments of which the first is very short, the second about twice as broad as long, the third slightly longer than broad, the fourth about twice as long as the diameter of the distal end, the fifth nearly or quite three times as long as the distal diameter in lateral view, and the sixth-ninth or -tenth slightly loncjer than the fifth ; the followino- seg- ments decrease almost imperceptibly in length so that the nineteenth and fol- lowing are about twice as broad as long; from the twentythird segment the cirrus J ö Fig. 12. tapers CÜStaJly tO a Very Slencler tip, and Lateral view of the proximal portion of a specimen of Psathyrometra m the segments increase in proportionate from Stat'45- About twice natural size- (Courtesy of the as- Nat!onal Museum> length so that the last preserved is five or six times as long as broad ; from the third onward the segments in lateral view are gently concave both dorsally and ventrally, so that the arti- culations are prominent, but this decreases and disappears in the relatively short distal segments. The cirri are moderately compressed laterally throughout their entire length, and resemble those of the species of Pentametrocrinus and Thaumatocrinus. The post-radial series resemble those of Ps. mira ; the distance from the radial • to the first syzygy is 8.0 mm. The "Investigator" dredged this species at Stat. 115 in the Andaman Sea (1 1° 3i'4o" X., 02°46'o6"E) in 338 — 396 Metres, on green mud; the bottom temperature was I3°.3 C. 7. Psathyromcira mira A. H. Clark. A. H. CLARK. Proc. U.S. National Museum, vol. 36, 1909, p. 648 (Psathyrometra mira). Proc. Biol. Soc. Washington, vol. 22, 1909, p. 149 (Psathyrometra mira). Records of the Indian Museum, vol. 7, 1912, part 3, N° 26, p. 270 (Psathyrometra mira). Crinoids of the Indian Ocean, 191 2, p. 235, fig. 43, p. 235 {Psathyrometra mira). Stat. 45. 7°24'S., u8°i5'.2E. Flores Sea. 794 Metres. 1 Ex-. Stat. 170. 3°37'.7S., I3I°26'.4E. Ceram Sea. 924 Metres. 1 Ex. The specimen from Stat. 45 has the centrodorsal relatively slightly longer than that of the type specimen, though it agrees exactly in all other particulars; it is 4.0 mm. in diameter at the base and 4.25 mm. from the apex to the interradial border. Pj is 10 mm. long, composed of 22 segments, at first short, becoming about as long as broad on the eighth, and twice or three times as long as broad terminally ; the short earlier segments have their corners cut away as in Heliometra glacialis\ the pinnule is slender, and becomes flagellate distally. P is 10 mm. long with 23 segments, resembling 1',. I' is g min. long with :i segments, similar to, bul slightly more slender than, the pinnules preceding; it is very slightly less si. mi 1 ..i^.ill\-, bul tapers less and lacks the flagellate tip. I', is s mm. long with 18 segments and resembles I'. 1' lias the basal segments more 1 il away than I' . and I', than I' ; I', has a longer flagellate tip than I' , and is in general more flexible; 1', difters from I' in the same way. rhe individual from Stat. 17'' is slightly larger with a shorter centrodorsal, the sides ui which make a slightly greater angle with each other; the centrodorsal measures 5.6 mm. in diameter at the has.- and 5.0 mm. from the apex to the interradial border; the dorsal pole is worn and rounded <>tï: only one of the columns of cirrus sockets consists of four, but this appears to be due to the wear on the dorsal pole which extends basalward tor a greater mo- than usual, apparently due to the age of the specimen. The distance from the radials to the first syzygy is 7.8 mm.: tin- diameter at the level of the first syzygy, beyond which point the arms are lost. is 15.5 mm. S. Psathyr ometra parva \. 11. Clark. .\. II. Cl.ARK. Proc. U.S. National Museum, vol. 39, [Qii, p. 562 [Psathyr ometra parva). Psathyr ometra minima A. II. Clark. .\. II. CLARK. Notes from the Leyden Museum, vol. 34, 1912, p. 141 [Psathyrometra minima). Stat. 4S. S;,4'.; S., ii8°44'.3l.. Flores Sea. 2060 Metres. 1 Ex. The centrodorsal is sharply conical, i.S mm. in diameter at the base and 1.0 mm. from the . 1 tin- interradial border; somewhat irregular shallow grooves averaging about half as v. the cirrus sockets separate the sides of the centrodorsal into live radial areas each of which contains two closely crowded columns of cirrus sockets usually of two each. The radials project very slightly bevond the edge of the centrodorsal and are strongly produced in the- interradial angles so that tliey entirely separate the bases of the IBr,; the [Br are about twice as broad as Ion-, and are deeply incised by a rounded posterior projection from the axillary; the IBr (axillaries) are rhombic with strongl) concave sides, about as long as broad, the anterior angle strongly produced, and the centre of the proximal border produced into a rounded process incising the distal border oi the ibr. The three brachials preserved resemble those of such species as Ps. congesta but the synarthrial tubercles are scarcely developed. I,. distanci from the apex of the centrodorsal to the firsl syzygy is 5.5 mm. ro. Psathyrometra gracillima \. II. Clark. A. 11. CLARK, i . Wa hington, vol. 22, 1 109, p. [49 [Psathyrometra gracillima). Cru: the [ndian Ocean, [912, p. ';'•, fig. 44, p. 237 [Psathyrometra gr acilh 11. Psathyrometra congesta \. II. Clark. A. II. CLARK. Proc. U.S. National Museum, vol. 54, 1908, p. 2:1 [Psathyrometra 229 12. Psathyrometra inusitata A. H. Clark. A. H. CLARK. Records of the Indian Museum, vol. 7, 1912, part 3, N" 26, p. 270 (nomen nudum ; 7 miles S.E. by S. from Ross Island ; 265 fathoms). - Notes from the Leyden Museum, vol. 34, 1912, p. 141 [Psathyrometra inusitata). Stat. 38. 7°35'.4S., ii7°28'.6E. Flores Sea. 521 Metres. 1 Ex. Stat. 45. 7°24'S., n8°i5'.2E. Flores Sea. 794 Metres. 1 Ex. Stat. 178. 2°4o'S., 1280 37'. 5 E. Ceram Sea. 835 Metres. 1 Ex. Stat. 314. 70 36' S., 117° 30'. 8 E. Flores Sea. 694 Metres. 1 Ex. Stat. 316. 7°i9'.4S., u6°49'.5E. Flores Sea. 538 Metres. 2 Ex. The centrodorsal is small and conical, the sides slightly, if at all, convex; the basal diameter is 3.2 mm., the distance from the apex to the interradial border 2.4 mm.; five very narrow bare areas divide the sides of the centrodorsal into five radial areas ; these at the base are rarely half as broad as the adjacent cirrus sockets, and they are more or less èncroached upon by the cirrus sockets on either side so that their course is usually more or less zigzag or irregular; they are scarcely to be recognized otherwise than that the outer columns of cirrus sockets in each radial area are slightly separated from the outer columns in the next area, whereas within each area all the columns are closely crowded. Each radial area has three columns of cirrus sockets, the two outer of four each, the median of two only; the sockets are very closely crowded, the two outer columns coming into apposition just beyond the median; at the dorsal pole there are a number of pits representing obsolete cirrus sockets, some of which are situated in the interradial furrows; their arrangement appears to be in alternating rows instead of in columns. No basal rays are visible. The radials are even with the edge of the centrodorsal, but extend slightly upward in the angles of the calyx, where their tips are slightly separated. The \¥>xx are short, proximally nearly four times as broad as long in the median line, but decreasing in width distally where they are only about three times as broad as long in the median line; they are widely separated from their neighbors; the IBr„ (axillaries) are rhombic, half again as broad as long, with the anterior angle produced; the lateral angles extend far beyond the distal lateral angles ■ of the IBrj and meet those of their neighbors, forming large water pores; the synarthrial tubercle is only slightly indicated. The first brachial is three times as long exteriorly as interiorly, half again as broad basally as the exterior length; ■" o J ° Fig. 13. the inner edges are entirely free and make approximately a Lateral view of the centrodorsal eind arm . . bases of a specimen of Psathyrometra inusitata right angle with those of the adjacent first brachials ; the from near the PosüUon Islands. Enlarged, outer sides are in apposition with the outer sides of the first (Courtesy of the u. s. National Museum), brachials on the adjacent rays. The second brachial is irregularly quadrate, the two of each arm pair in contact interiorly so that a water pore is formed similar to that between the ossicles of the IBr series. The first syzygial pair (formed of the third and fourth brachials is 2 3' ' slightly longer interiorly than exteriorly, about as broad as the interior length; the next four brachiak are slightly « twice as broad as the median length, the brachials then oming more obliquely w iped. Syzygies occur between the third and fourth brachials, again between the ninth and tenth and fourteenth and fifteenth, and distally at intervals ol usually tour oblique muscular articulations : bul the (listal intersyzygial interval can only be timated as the out of the arms in all the specimens is lust. Thouefh the animal is very small the IBr series and lown>ader than lon^f. i next five about as long as broad, the seventh slightly longer than broad, and the succeeding :oming greatly elongated. 1', is much stouter (rand longer) with the first tour segments short but the following rapidly increasing in length and the outer exceedingly elongated. From Stat. 38 there is a specimen smaller than the one described. The interradial bare are. is on the centrodorsal are almost wholly obliterated; the arrangement of the cirrus sockets iilar than described, the distribution in columns being more or less obscured. e example trom Stat. 45 is that described in detail above. The individual from Stat. 1 78 is similar to that from Stat. 38, but very slightly smaller, and with the bare interradial areas on the centrodorsal slightly better marked. A similar specimen was dredged at Stat. 314. Tun small specimens are from Stat. 316; several broken cirri remain ; these are of the type characteristic of the genus; the longest is 19 mm. long with 21 segments of which the proximal are about four times as long as the expanded distal ends, and the outer about as long, but with unmoditied distal ends; the cirri are slender, but not excessivelv so, and taper distally to a point. The arrangement of the obsolete cirrus sockets about the tip of the centrodorsal in alternating rows rather than in columns is very interesting in indicating the possible course of development of the centrodorsal characteristic of the Zenometrinae through the type common to the other groups in the Macrophreata, especially of the Bathymetrinae. The entirely smooth ossicles of the division series and brachials of the species of this nis, even of the smallest, are very characteristic. [3. Psathyrometra antarctica \. H. Clark. A. H. Cl/ Crinoiden der Antarktis, 1915, p. 116, pi. 2, figs. la, 16 [Psathyrometra nut l) 1 .}. Psathyrometra anomala \. H. Clark. A. H. CLARK. Notes from the Leyden Museum, vol. 34, 1912, p. 143 [Psathyrometra anomala). Stat. 211. 5 40.7 S., i l Sea. 115S Metres. 1 Ex. The centrodorsal is low, rounded conical, 1.7 mm. in diameter at the base and about mm. in.m the apex of the dorsal pol to the interradial margin; there are twenty large 231 cirrus sockets, four in two closely crowded columns in each radial area, the columns in each radial area separated from those in the adjacent radial areas by narrow irregular lines. The arm structure is as in Ps. inusitata-, the arms were probably about 20 mm. long. P„ bears a small genital gland. 15. P sathyrometra sp. Stat. 38. 7°35'.4S., ii7°28'.6E. Flores Sea. 521 Metres. Fragments. Two arm fragments and an incomplete cirrus from Stat. 38 belong to a species near, if riot, Ps. major. The incomplete cirrus is 24 mm. long and is composed of 18 segments. Leptometra A. H. Clark. Key to the Species of the Genus Leptometra. a1 Cirri very long and slender, gradually tapering to a point distally, all of the component segments being about twice as long as broad, the outer without any modification of the distal dorsal edge, so that the dorsal profile remains smooth ; arms up to 150 mm. in length; cirri 50 mm. to 60 mm. long (M edi t erranean and Aegean Seas; 54 — 1292 Metres) phalangium a~ Cirri proportionately shorter, without a distal taper and hence in the outer part appearing considerably stouter, composed in the proximal portion of segments which are about twice as long as broad, the distal segments becoming shorter, about as long as broad to, at most, one third again as long as broad, and having the distal dorsal edge somewhat swollen so that the dorsal profile of the cirri is slightly scalloped ; arms up to 125 mm. in length; cirri 30 mm. to 40 mm. (usually 35 mm. to 40 mm.) long (from the western coast of Scotland, and Ireland, southward to Madeira; 45 — 450 Metres) celiica Zenometra A. H. Clark. The only species in the genus Zenometra is 1. Zenometra eolumnaris (P. H. Carpenter). P. H. Carpenter. Buil. Mus. Comp. Zool., vol. 9, 1SS1, N° 4, p. 169, pi. 1, fig. 8 {Antedon eolumnaris). A. H. Clark. Proc. U.S. National Museum, vol, 34, 1908, p. 237 {Zenometra pyramidalis). HARTLAUB. Memoirs Mus. Comp. Zool., vol. 27, 1912, N° 4, p. 406. pi. 8, fig. 13; pi. 10, figs. 6 — 14; pi. 15, fig. 9 {Antedon eolumnaris). Sarametra A. H. Clark. The only species in the genus Sarametra is 1. Sarametra triserialis (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 34, 190S, p. 219 [Zenometra triserialis). Eumorphometra A. II. Clark. Key t" the Species t>t' the Genus bumorphometra. .i Cirrus segments 20 25, of which the fourth-sixth are about twice as long as broad shores of the Antarctic continent in the vicinity of Gauss- bei Metres) concinna a- Cirrus segments the longest only slightly longer than broad (near Marion [sland, in - l 3°"E.,; 252 Metres) hirsuta 1. Eumorphometra hirsuta (P. 11. Carpenter). P. II. CARPENTER. "Challenger" Reports. Comatulae, xiSSS, p. 18S, pi. 31, fig. 5 {Antedon kir Si \. II. CLARK. Smithsonian Miscellaneous Collections, vol. 6i, 1913, N° 15, p. 66 [Thaumato- metra hirstt Die Crinoiden der Antarktis, 1915, p. 118 [Eumorphometra hirsuta). 2. Eumorphometra concinna A. H. Clark. A. II. CLARK. Die Crinoiden der Antarktis, 191 5, p. 118 [Eumorphometra concinna). Balanometra A. II. (huk. Kcv tu the Species of the Genus Balanometra. entrodorsal verv long, nearly three times as long as broad at the base; the two columns of cirrus sockets in each radial area are separated from those in the adjacent radial areas by shallow rounded furrows averaging about half as broad as the sockets-, the two columns are separated from each other by a line rather less than half as broad as the furrows separating the pairs; 27 — 35 cirrus gpnents, of which the longest are four times as long as broad or even longer, and the terminal ten are as long as, or slightly longer than, broad (Philip- pine Islands; 140 Metres) elongata aa Centrodorsal conical with slightly swollen sides, half again as long as broad at the base; the two columns of cirrus sockets in each radial area are separated from those in the adjacent radial areas by dcep interradial furrows, and the two columns themselvs are separated by a similar, but narrenver and shallower furrow; 35 -411 cirrus segments, of which the longest are not over three times as long as broad, and the outermost are all markedly longer than broad (Philippin e Islands; 148 Meti balanoides 1. Balanometra elongata \. 11. ('Luk . A. II. ('i. ark. Smithsonian M neous Collections (Quarterly Issue), vol. '7i. 1908, part 2, p. 229 | Perometra elo 2. Balanomctra balanoides (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1 888, p. 207, pi. 33, figs. 6, 7 {Antedon balanoides). A. H. Clark. Smithsonian Miscellaneous Collections vol. 61, 191 3, N° 15, p. 57 [Balanometra balanoides). Adelometra A. H. Clark. Key to the Species of the Genus Adelometra. a1 Centrodorsal columnar-. cirri XXV — XL, 60 — 70, 25 min. long; longest cirrus segments less than tvvice as long as broad, with very slightly expanded distal ends; 14 arms; IIBr series usually 4 (3 + 4) (Kei Islands; 252 Metres) angustiradia a3 Centrodorsal rounded conical, about half again as long as broad at the base; cirri about XXX, 30 — 35, from 13 mm. to 18 mm. long; longest cirrus segments (fourth-tenth) about three times as long as the distal diameter, with expanded and funnel-shaped distal ends; 10 arms (off Havana, Cuba; 380 Metres) ' teuuipes 1. Adelometra angustiradia (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 188S, p. 253, pi. 45, fig. 4 {Antedon angustiradia). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 19 1 3, N" 15, p. 57 {Adelometra angustiradia). 2. Adelometra teuuipes A. H. Clark. A. H. CLARK. Proc. U.S. National Museum, vol. 36, 1908, p. 236 {Adelometra teuuipes). 4th Subfamily Perometrinae A. H. Clark. Key to the Genera of the Subfamily Perometrinae. a1 Pj and P„ absent; size small, the 10 arms being from 25 mm. to 35 mm. (usually between 25 mm. and 30 mm.) in length ; cirri XX — XXX, 22 — 25, 10 mm. long (West Indies; 59 — 433 Metres) Hypalometra a3 Pj always present, though P„ (on the inner distal end of the first syzygial pair) is sometimes absent b1 ossicles of the IBr series and first tvvo brachials with smooth and unmodified depressed borders, laterally in close apposition with their neighbors and sharply flattened against them ; synarthrial tubercles (on the articulations between the elements of the IBr series and first two brachials) very prominent, sometimes extravagantly developed; Px is as long as, longer than, or shorter than, P2; P,7 may be absent; 10 — 14 (usually 10) arms SIBOGA-EXPEDITIE XLll/'. 30 - 3 1 from 35 mm to 90 mm. long 28 55 cirrus segments [from Madagas- to the Kei [slands and southern Japan; 70 — 252 [? 273] Meti ... Perometra the ossicles of the IB nd first two brachials may I»- just in contact laterally, but their si ver sharply flattened, and prominent synarthrial tubercles ;ir< never developed; their lateral borders always ear tubercles, one or manj to each ossicle, and their distal and proximal re usually prominently everted and tubercular interbrachial portions of the perisome naked; Pa always present (Kei [slands and southern Japan; 204 — 344 Metres) .... Nanometra interbrachial p of the perisome with numerous prominent rounded - nodules which are not in lateral contact; P„ usually absent Moli ind southern Japan; 99 — 270 Metres). . . . Erythrometra Perometra A. II. Clark. Key to the Species of the Genus Perometra. irsal rounded conical; cirri numerous, long and slender, XXX XL, 25 mm. to 30 mm. long; arms 50 mm. long*, or longer 11-14 arms 50 mm. long: IIBr series 2; synarthrial tubercles greatly, but not extravagantly, developed: all ol the earlier pinnules present (Providence [sland, northeast of Madagascar; 225 Metres) afra IC) arms 70 mm. to 90 mm. long; synarthrial tubercles extravagantly developed; 1 usually absent (southern Japan, from the Korean Straits to mi Bay; 7(1 — 250 [? 273] Metres) diomedéae entrodorsal low hemispherical ; cirri X\'. 28; 10 arms 35 mm. long-, all the earlier pinnules present Kei Islands; 252 Metres) pusilla 1. Perometra afra \. II. Clark. A. II. I i VI ... Proc. U.S. National Museum, vol. 40, 1911, p. 43 [Perometra afra). :i Misccllaneous Collections, vol. 61, 1 9 1 3 , N° 15, p. 57 [Perometra afra 2. Perometra diomedéae \. II. ("huk'. A. II- Cj VRK. Proc. U. S National Museum, vol. 33, 1907, p. [46 [Antedon diomedt I'i National Museum, vol. 34, 190.S. p. 316 [Perometra dit ;. Perometra pusilla 1'. 11. < arpenter). 1'. II. (aki. "Challenger" Reporl latulae, 18S8, p. 1 ; 1 . pi. 23, fig. 1 [Antedon pil!. A. II. ('1. ark. Proc. U.S. Natioi il Museum, vol. 59, 1911, p. 561 [Perometra pusilla). — — Smithsonian Miscellan ons, vol. 61 1 113, \" 15. p. 58 [Perometra pusilla). Erythrometra A. H. Clark. Key to the Species of the Genus Erythrometra. a1 Cirri with 36 — 39 segments, iS mm. long; arms 60 mm. long (Moluccas; 236 Metres) australis a3 Cirri with 30 segments, 11 mm. long; arms 35 mm. long (s o u t h e r n Japan; 99 — 270 Met r es) ruber 1 . Erythrometra australis sp. nov. "Albatross" Stat. 5617. Dodinga Bay, Gilolo. 236 Metres. 1 Ex. The centrodorsal is hemispherical, the small bare dorsal pole covered with closely set rounded tubercles. The cirri are about XXX, the long peripheral 18 mm. long with 36 — -39 segments, the short apical 4 mm. long with about 15 segments. In the long peripheral cirri the first two segments are more than twice as broad as long, the third is slightly broader than long, the fourth is from one third to one half again as long as broad, the fourth and fifth are about twice as long as broad, and the following gradually decrease in length to the fourteenth which is about as long as broad, and still further to the last dozen or so, which are about twice as broad as long; the longer earlier segments are rather strongly constricted centrallv, with prominent ends ; the distal dorsal border of the proximal segments is prominent ; as the segments become shorter they gradually develop a prominent median carination the crest of which is convex in lateral view. The radials extend slightly beyoncl the rim of the centrodorsal ; their distal border is abruptly everted, smooth or more or less tubercular. The IBrj are approximately oblong, between three and four times as broad as long, the proximal and distal edges prominently everted, the lateral eclges bearing from four to six long blunt tubercles. The IBr2 (axillaries) are rhombic, not quite twice as broad as long, the proximal and distal edges everted, and the lateral angles produced into a ventrolateral process, or bearing two long blunt tubercles resembling those on the lateral borders of the IBrr Usually the sides of the IBrj diverge at an angle of about 6o°, and the lateral angles of the axillaries nearly or quite meet above the gap thus formed. The arms are about 60 mm. long. The first brachials are short, twice as long exteriorly as interiorly, the median length approximately the same as the inner ;,the inner edges are in apposition, and the outer bear a rather broad thin ventrolateral process, and at the distal angle a tubercle; the proximal, and outer half of the distal, edges are thickened and everted. The second brachials are irregularly quadrate, twice as broad as long, with the proximal border slightly everted ; the proximal inner and outer angles usually bear a tubercle. The first syzygial pair (composed of the third and fourth brachials) is slightly longer interiorly and exteriorly, half again as broad as the median length; the next two brachials are hly oblong, the following becoming triangular, about as long as broad, and after the basal thiril of the arm wedge-shaped, and elongate distally. The distal edge of the brachials is rather prominent and finelj spinous; their dorsal surface is longitudinally striate. Sj ygies oei the third and fourth brachials, again hetween the ninth and tenth and fourteenth and fifteenth, and distall) at intervals of two oblique muscular articulations. The interradial portions ol the perisome of the disk bear numerous calcareous concretions qual in size which, entirely and rather widely separated from each other, are elevated above the general surface in the shape of thick papillae. i' i- I) large and stout, and recalls I'. in certain varieties of Oligometra serri- pinna\ it is o mm. long, composed of i: segments of which the fust is about as long as . 1. and the remainder ahorn half again as long as broad; the distal border on the outer a;iv from the disk: is everted and fmelv spinous. I' is 3 mm. Ion- with 10 segments; it resembles P> but is proportionately smaller, and the outer segments have a greater development of spines. 1' is 3 mm. long with io segments, more slender than P,. the component segments mor- ite with more everted and spinous distal ends. The following pinnules resemble I1. but slowly increase in length. The distal pinnules are j mm. long, very slender, with tg segments of which all but the first two an- greatly elongated with swollen articulations and overlapping and spinous distal ends. 1' is absent from seven arms, and present on three. The colour in life is pale orange and yellow, according to a note by Mr F. M. Chamberlain. The specimen described in Cat. X" 36050 U. S. National Museum. 2. Erythrometra ruber \\. II. Clark). A. 11. Clark. Proc. U.S. National .Museum, vol. 33, 1907, p. 146 {Antedon rul Proc. U.S. National Museum, vol. 34, 190S, p. 316 [Erythrometra rul Hypalometra A. II. Clark. The only species in the -rnus Hypalometra is 1. Hypalometra defecta 1'. II. Carpenter). 1'. 11. Carpenter. "Challenger" Reports. I omatulae, 1888, pp. 54, 206, 207. 3 . 378 >i tt- Jon defect Haki i.aii:. Memoirs Mus. Coitip. Zool., vol. 27, 1912, N 4, p. 3S1. pi. e. figs 1 4; pi. 14, 1 1 . Intedon de/, • Nanometra A. 11. (huk. Key to il). ,1" the i inius Nanometra. 1 irri LXX, |; 17. 25 mm. t.. jo mm. long; distal borders of the radials and bon i the [Br series usually unmodified, rarely hearing tubercles; 237 Pj has 20 segments; P3 is slightly shorter with 17 segments; arms 120 mm. long (Kei Islands and Moluccas; 204 — 567 Metres) clymene 3} Cirri XXX — XL, 30 — 45 (usually 35 — 40), 13 mm. to 15 mm. long; distal borders of the radials and borders of the ossicles of the IBr series and lower brachials prominently everted and finely tubercular or spinous ; Pj has 8 — 10 segments; P., is slightly shorter; arms 40 mm. to 50 mm. long (southern Japan; 250 [? 1 85]— 344 Metres) bowersi 1. Nanometra clymene A. H. Clark. A. H. CLARK. Notes hom the Leyden Museum, vol. 34, 1912, p. 143 [Nanometra clymene). Stat. 173. 3°27'.oS., i3i°o',5 E. Ceram Sea. 5Ö7 Metres. 1 Ex. Stat. 251. 50 28'. 4 S., i32°o'.2E, Arafura Sea. 204 Metres. 4 Ex. Stat. 253. 5°48'.2S., I32°I3'E. Arafura Sea. 304 Metres. 1 Ex. Stat. 254. 5°4o'S., I32°2Ó'E. Arafura Sea. 310 Metres. 1 Ex. The centrodorsal is long, rounded conical, about 3.5 mm. in diameter at the base and about 3.0 mm. from the apex to the interradial margin; the dorsal pole is 2.0 mm. in diameter, slightly concave; the cirrus sockets are arranged in four or five closely crowded regularly alternating rows, or four closely crowded alternating columns, in each radial area. -The cirri are about LXX, 43 — 47, 25 mm. to 30 mm. long, moderately slender; the first segment is very short, the second about twice as broad as long or even somewhat broader, the third nearly as long as broad, the fourth about one third again as long as broad, the sixth-eleventh or -twelfth about twice as long as broad; the following gradually decrease in length so that the last ten or eleven before the penultimate are twice as broad as long; on the fourth and following the distal dorsal edge projects slightly, this on the short outer segments becoming a prominent median carination with a convex crest occupying the entire dorsal surface of the segment. The ends of the basal rays are visible as rather prominent rounded triangular areas in the angles of the calyx. The radials are rather prominent, and are nearly as long in the median line as laterally; the plane of their mid-dorsal line is nearly go° divergent from the dorsoventral axis. The IBrj are four times as broacl as long in the median line; the lateral edges are from one third to one half again as long as the median length, strongly convergent, continuing in the same direction as the lateral portion of the distal border of the radials on either side; the median third of the proximal border is slightly convex ; the distal border is deeply incised by a posterior rounded projection from the axillary; the distal half of the lateral borders is produced in the form of a prominent tubercular process. The IBr, (axillariesj are about as broad as long, the anterior angle slightly produced, the anterior sides making approximately a right angle with each other; a strong rounded posterior process extends to about the same distance below the line passing through the two lateral angles that the anterior angle reaches above it; just below the lateral angles there is a prominent tubercular process; the distal edges, like.the lateral portions of the distal edge 238 of ti are bordered with exceedinglj fine spines. The synarthrial tubercles, though broadly nded, are rather prominent. 1'hc first brachial is short, three times as long exteriorly as interiorly, slightly longer in the median line than interiorly; the interior edges are in apposition; the exterior edges are slightly concave: the distal inner corners bear a rudimentary tubercle similar to that on the outer part of the lateral borders of the IBrv These tubercles on the H'>r,. with the adjacent tubercles under the lateral angles of the axillaries, almost completely close what otherwise would be a large rhombic water pore. Tlv nd brachial is much larger than the first, in direct dorsal view almost an equilateral triangle; the outer border is slightly concave; the distal edge is very finely spinous. Tlv ti: i.il ]>air (composed of the third and fourth brachials) is slightly longer interiorly than exteriorly, about twice as broad as long in the median line, the sides slightly ive, the distal edge very finely spinous. The following brachials rapidly become obliquely wed| 1. after the second syzygy triangular and as long as broad with very finely spinous tnd later obliquely wedge-shaped again. ir between the third and fourth, ninth and tenth and fourteenth and fifteenth hials, and distally at intervals of four (more rarely three) oblique musctilar articulations. The brachials have projecting and overlapping finely spinous distal edges, and the dorsal e is marked with fine parallel longitudinal ridges. The arms are 120 mm. long. 1' is from 12 mm. to 13 mm. long, composed of 20 segments of which the first is slightly longer than broad, the second is about half again as long as broad, the third is about as long as the proximal length, and the fourth and following are about two and one halt" times as long as broad; P, is the longest pinnule on the arm, though only slightly longer than the distal pinnules; it is smooth with long segments, rather stiff and moderately stout, tapering moderately in the proximal third, more gradually from that point onward; in its general appearance, especially in the very close union of its segments which have perfectly straight ends, it recalls 1' in the larger species of Psathyr ometra. 1' is from 10. o mm. to 10.5 mm. long with 17 segments, similar to \\ but tapering rather more evenly. 1' is S mm. long with 13 or 14 segments, similar to 1', and 1\. bul with the segments more enlarged distally and proportionately smaller. 1', is 5.5 mm with 12 or 13 segments, similar to Pg, but with the distal segments slightly more 1 I' is 5.5 mm. long. ibling the preceding pinnule but more slender, with 12 or 1; segments >•( which the distal are more elonsrated. 1' is - mm. long with 1 n nts, longer, less slender and less stiff than those preceding, tal egments with very slightly spinou edges. The following pinnules are similar to I' Tlv distal pinnules are lingly slender, 11 mm. long with 23 segments of which first two are unusually enlarged and the following are moderately elongate with swoHen .01 1 hm |y spino is ends. The specimen described is that from Stat. 253. 239 The example from Stat. 173 is slightly smaller than the one just described, with the axillaries and brachials proportionately slightly longer. One of the individuals from Stat. 251 has the centrodorsal hemispherical, the base slightly elongated, the distal border of the radials prominently everted and broken up into five or six laroe rounded bead-like tubercles of which the central one is rather larper than the others, and similar tubercles along the lateral borders of the IBi^ and the outer thirds of the contiguous borders of the IBrj and IBr..,. The others, which are smaller, have conical centro- dorsals, and plain and unmodified IBr series and lower brachials-, owïng to the non-development of tubercles on the distal angdes of the IBr, and beneath the lateral an°des of the axillaries there are large water pores between the IBr series. The specimens from Stat. 254 resemble the smaller individuals from Stat. 251. 2. Nanometra bowersi (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 144 {Antedon minor; name preoccupied); p. 148 {Antedon bowersi). Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, part 3, p. 341 {Antedon orientalis); p. 349 {Nanometra minckerti; new name for Antedon minor, preoccupied). Proc. U.S. National Museum, vol. 34, 1908, p. 318 {Nanometra bowersi; here considered as including Antedon minor and Antedon orientalis). 5th Subfamily Isometrinae A. H. Clark. The only genus in this subfamily is Isometra, of which a complete account will be found in "Die Crinoiden der Antarktis", pp. 145 — 146 v). 6th Subfamily Heliometrinae A. H. Clark. Key to the Genera of the Subfamily Heliometrinae. a1 10 radials and 20 arms (coasts of the Antarctic continent, and Kerguelen I si and; 18 — 400 Metres) Promachocrinus a3 5 radials and 1 o arms b1 each brachial bears a high median carinate process ; Pj much longer than P., (coasts of the Antarctic c o n t i n e n't ; 2 2 3 — 400 [? 900] Metres) Anthometra b2 no carinate processes on the brachials c1 brachials very short, much broader than long; middle and distal pinnules with very short segments which are rarely longer than broad; cirrus segments very short, only very few, or none at all longer than broad ; P, and P, of approximately the same length ( v i c 1 n i t y of H e a r d I s 1 a n d , and the winter quarters of the "Discovery"; 135 — 270 Metres) Solanometra I) Deutsche Siidpolar-Expedition, vol. 16 (Zoölogie, vol. S), May 16, 1915. -I' ' brachials longer, about as long as broad or slightly longer than broad; segments of the middle and distal pinnules longer than broad, usually very much so; a number of the earlier cirrus s< ments longer than bn d' P. with v' 1.5 segments ol which those beyond the seventh to eleventh are than broad, the distal elongate, though never much more than twice as long as broad; 1', is similar to P hm sh Vrabian Sea to southwestern Japan; 192—2160 Metres) Cyclometra d9 1', with 50 1 ■ segments of which only the terminal are longer than broad, and those only very slightly so; I', is similar to 1',. and usually of about the same length brachials with smooth distal edges; ossicles of the division series with smooth borders and a smooth dorsal surface; no rudimentary terminal comb on the proximal pinnules Arctic Ocean, and southward to Norway and Nova S e o t i a ; western s h o r e s of the O k h o t s k and fapanese Se as from Cape Terpenia to Korea; 1 2 — 1340 Metres) Heliometra brachials with spinous distal edges; ossicles of the division series with usually spinous borders and commonly with a -reuter or lesser development of spines on the dorsal surface; the proximal pinnules bear a rudimentary terminal comb sug- gesting that found in the species of the Comasteridae (from Cape Hom northward along the western co ast of South and North America to Alaska, the nee westward and southward to southern Japan; 11 [911 Metres) Florometra The genus Heliometra includes only the well known Heliometra glacialis (Leach) (= Antedon eschrichti J. Muller] of P. 11. Carpenter and earlier authors generally). Antkometra, Solanometra and Florometra are best considered as subgenera of Proma- chocrinus. A full account of the first two and the last will be found in my memoir on "Die Crinoiden der Antarktis" '). Florometra A. 1 1. Clark. Key to the Species of the Genus Florometra. fhird syzygy between the 1 \' and iV brachials third syzygy between the 1 \' ■ and \ yu brachials with very rare exceptions; 1; I ■ id. vol. 11 1 1 -■ ■ 1 1 ). 24I dorsal surface and borders of the ossicles of the IBr series and lower brachials smooth ; synarthrial and articular tubercles more or less prominent, especially in large specimens, g'iving the arm bases a rugged appearance ; arms from 225 mm. to 230 mm. in length c1 more slender ; synarthrial and articular tubercles moderately developed ; P6 as long as Px, the intermediate pinnules longer (Bering Sea and the westernmost Aleutian Islands to the G.u 1 f of Alaska, and southward to Monterey Bay, California; yy — 1911 Met r es) asperrima c3 stouter; synarthrial and articular tubercles strongly developed; Pj, P3 and P., of equal length ; Pt slightly, P. much shorter (eastern coast of Japan, from Yezo Strait southward to Li n schoten Strait, between Shikoku and Hondo; 959 [? 540] to 1056 Metres) laodice \r third syzygy rarely between the i4th and 15"1 brachials, usually between the 15"1 and iólh or ióth and i/1'1; borders of the ossicles of the IBr series and lower brachials prominently spinous, and a greater or lesser development of spines on their dorsal surface, particularly in the lateral portions ; lower segments of the proximal pinnules strongly carinate, the carinate processes spinous; synarthrial and articular tubercles undeveloped ; arms from 140 mm. to 175 mm. long (eastern coast of Japan, from Sendai south- ward to Saga mi Bay; 126 — 606 Metres) mariae 3." Third syzygy between the i6th and iyth brachials b1 small, the arm being not over 125 mm., and usually not over 100 mm. in length ; ossicles of the IBr series and first two brachials with finely spinous borders, and with a single, rarely. more, prominent spine near the outer borders, more rarely also with a few spines scattered over the dorsal surface (from southern California southward to Panama Bay; 102 — 711 Metres) tanneri b3 larger, the arms being usually about 150 mm. long, and often longer c1 ossicles of the IBr series and lower brachials entirely devoid of spines on the dorsal surface, and without spinous borders d1 proximal. pinnules not swollen basally, Px and P^ being extremely slender throughout their entire length, their basal segments with the distal angles deeply truncated so that the dorsal border is narrowed to a slightly rounded 'point usually crowned with a few spinelets (from south eastern Alaska southward t o Panama; 11 — — 1407 Metres) perphxa d2 Pj to P4 distinctly swollen in the first five or six segments, noticeably more slender beyond ; basal segments with their distal angles but slightly truncated, so that the distal border is relatively long and SIBQGA-EXPED1TIE XU[i. 31 242 straight, parallel to the longitudinal axis of the pinnule1 w<-st iast " t rierra del Fu eg o a n d so u th western Chil e a nd the adjacent islands from Na var in I si and northward to rom Bay, in 5O0o8'3o"S., ;\ p oo W.; 22 -326 Metres) magellanica ossicles of th<- IBr series and first two brachials with spinous borders, and with .1 r or lesser development of spines on the dorsal surface d1 1' to I', distinctly swollen in the first five or six segments, noticeably mo nder bevond; basal segments with their distal angles but slightly truncated, so that their distal border is relatively long and straight, parallel to the longitudinal axis of the pinnule; spines on the of the IBr series and fust two brachials never very numerous nor long (west coast of Tierra del Fuego and South- west e r n C h i 1 e and the adjacent islands, f r o m N a v a r i n Island northward to Toni Bay, Patagonia; 22 — 326 Metres) magellanica d: proximal pinnules not swollen basally, P, and P, being extremely slender throughout their entire length, their basal segments usually with the distal angles deeply truncated so that the dorsal border is narrowed to a slightly rounded point which as a rule is crowned with a few spinelets; sometimes these segments have a very spinous carinate process e1 third syzygy almost invariably between the i6th and 17* brachials; ossicles of the IBr series and lower brachials very spiny (Puget Sound to southern California; 27 — 357 Metres) . . . serratissima e" position of the third syzygy variable, between the ia11' and i5lh, 1 5th and ióth or i6th and 1 7th brachials; spinosity of the ossicles of the IBr series and lower brachials moderately developed (eastern coast of Japan, from Sendai southward to Sa ga mi Bay; 126 — 606 Metres) mariae 1 . Florometra magellanica (Bell). BELL. Proc. Zool. Soc. London, 1882, p. 651, text fi xhrichti var. magellanica). ( HlERi ma. Revista marittima, vol. iy Dr REHüERG in Smyth's Channel, but no those from Panama). LUDWIG. Hamburger Magalhaensische Sammelreise, Lief. 4, 1 noiden, p. 1 {Antedon rhomboi 1 . ' :imens at hand from Cape innule almost <>f the 243 A. H. Clark. Buil. du Mus. d'hist. nat., Paris, 1911, N° 4, p. 257, fig. 2, p. 258 [Heliometra magellanicd). Smithsonian Miscellaneous Collections, vol. 60, 19 12, N° 10, pp. 3, 32 {Solanometra magellanicd]. Smithsonian Miscellaneous Collections,' vol. 61, 1913, N° 15, p. 62 {Florometra magellanicd). Buil. de 1'Institut océanographique, Monaco, N° 285, 19 14, p. 3, footnote {Antedon magel- lanica; referred to Florometra) . Die Crinoiden der Antarktis, 191 5, p. 142, pi. 8, figs. 1 — 5 {Promacliocrinus [Florometra] magellanicd). 2. Florometra perplexa (A. H. Clark). A. AGASSIZ. Buil. Mus. Comp. Zool., vol. 21, 1891, N° 4, p. 197 {Comatula sp.). HARTLAUB. Buil. Mus. Comp. Zool., vol. 27, 1S95, N'J 4, p. 139 {Antedon rhomboidea, part; specimens from Panama, but not that collected by Dr REHBERG in Smyth's Channel). A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. 74 {Antedon perplexa). A. H. Clark. Buil. Mus. Comp. Zool., vol. 51, 1908, N° 8, p. 238 {Heliometra rhomboidea). 3. Florometra serratissima (A. H. Clark). RlTTER. Science (N. S.), vol. 15, 1902, N° 367, p. 62 {Antedon rosacea). A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. JJ {Antedon serratissima). 4. Florometra tanneri (Hartlaub). HARTLAUB. Buil. Mus. Comp. Zool., vol. 27, 1895, N° 4, p. 141, pi. r, 'fig. 9; pi. 2, fig. 13; pi. 3, figs. 20, 22 {Antedon tanneri). 5. Florometra mariae (A. H. Clark). A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. f] {Antedon mariae); p. y8 {Antedon hondoensis). Die Crinoiden der Antarktis, 191 5, p. 142 {Florometra mariae; record of a specimen collected by Professor Dofleix). 6. Florometra asperrima (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. J^ {Antedon asperrima); p. 75 {Antedon inexpectata). 7. Florometra laodice . (A. H. Clark). A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 75 {Antedon laodice); p. 76 {Antedon rathbuni). As in the case of many other echinoderm genera inhabiting the north Pacific which as generic units are well circumscribed, the delimitation of the several species of Florometra presents extraordinary and unusual difhculties. Although the material at hand, consisting of about 1500 specimens from throughout the range of the genus, would be considered ample in the case of most types, in this case it merely increases the confusion. 244 metra magellan ns to 1"- a distinct form, confined to southern South America. F lor ometra laodice may be the same as F. asperrima, though occurring on the opposite shorr of the Pacific. ime specimens from the Gulf ol AJaska seem to be referable to Florometra ma; rather than t<> F. serrati and it is possible that the latter, which is probably only a spinous form of F. perplexa anyway, wil! eventually prove t<> be a synonym of mariae. Florometra tannert, though it appears to be. distinct, may be the young of F. perplexa, or of F. terrat or ol both forms. Cyclometra A. II. Clark. Key tn the Species of the Genus Cyclometra. al Larger; cirri XXVII, 41 43, 30 mm. long; arms [30 mm. long; P, 17 mm. tu in mm. long, with 42 45 segments (northwest of Socotra, in i4°2o' X.. E. ; 2160 Metres) flavescens i-irri XL — L, 25 — 30, 17 mm. long; arms 55 mm. long; P, 10 mm. long, with about 30 segments (southwestern Japan; 192 Metres) . . . clio 1. Cyclometra flavescens A. H. Clark. A. II. CLARK. Proc. Hiol. Soc. Washington, vol. 24, 1911, p. &j [Cyclometra flavescens). Crinoids of the Indian Ocean, 1912, p. 239 [Cyclometra flavescens). 2. Cyclometra clio (A. H. Clark). A. II. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 79 [Antedon clio). Subfamily B a thy m e tr inae A. H. Clark. Key to the Genera of the Subfamily Dathymctrinae. a' All the rirrus segments short, the longest not so much as twice as long the median diameter b1 cirrus segments cylindrical, without expanded distal ends, 25 — 33 >ually nearer the latter) in number, the longest (third-fifth) about one third again as Ion- as broad, those beyond the eighth about as long as broad, the distal slightly broader than long; [Br series and arm bases without lateral pro . and widely free laterally (western ist of I rel and: 69J M< tres Orthometra cirrus segments with much swollen distal ends, not more than 20 in number; 1 1 ir series and brachials in close lateral contact (Moluccas t<> Marion Island, southeast of Africa; to8g 2880 Metres) Tonrometra a Proximal cirr ■ ments elongated, at least twice as Ion- as the median meter, and usuallv much lon-er 245 b1 centrodorsal sharply conical with straight sides, nearly or quite as long as broad at the base Fariometra b3 centrodorsal less sharply conical, with rounded sides, or hemispherical, and lower c1 all the brachials have strongly produced and very spinous edges ; Px very slender and delicate, markedly longer than P3, with the outer segments very greatly elongated with overlapping and spinous distal ends (from southern Japan, the Hawaiian and Philippine Islands westward to Cape Comorin, the nee southwestward t o between M a r i o n I s 1 a n d and the C r o z e t s ; from the Ba)- of B i s c a y nortliward t o 5 4° 1 7' N. lat. , and from B r a z i 1 northward t o the Newfound- land banks; 24S — 2926 Me tres) Trichometra c2 the brachials do not have strongly produced and very spinous distal ends ; at most the distal edges of the outer brachials are bordered with fine spines d1 Pj much elongated, between two and three times as long as P,, composed of 30 — 40 segments of which a few of the basal are short, the following becoming slender and greatly elongated (Are tic Ocean from western Greenland to the Kara Sea, and southward to Portugal and Chesapeake Bay, and a 1 s o in the v i c i n i t y of Marion I s 1 a n d , southeast of South Africa; 18 — 1800 Metres) . . . . Hathrometra d'3 Pj the same length as, longer than, or shorter than, P„; but if longer never more than slightly so, and with not more than 20 segments e1 cirri with 20 — 30 relatively short segments of which the last six to thirteen are only very slightly, if at all, longer than broad f1 pinnules not especially long-, distal pinnules the same length as the proximal pinnules; P2 resembling Ps and the following pinnules, slightly longer and stouter than Pj with somewhat fewer segments which are proportionately longer; P„ may bear a gonad, though these usually begin on P3; arms 25 mm. to 60 mm. long; cirri L — LX, 21 — 30 (Kei and Meangis Islands, and southern Celebes; 204—1158 Metres) Nepiometra f- pinnules very long; distal pinnules not so long as the proximal pinnules; P0 very slightly shorter than P, but similar to it, with about iS elongated segments; following pinnules similar; arms about 20 mm. long; cirri about 2 .\<> XXX, utheastern South America; ioS<> Metres Phrixometra cirri with nut more than 20 much elongated segments all of which are markedl) longer than broad, especially the proximal I"1 more than XX\ cirri, which have 10— 20 segments (eastern Pacific, inclu d i n g the Sea s of ( )k hot sk and Japan, from western Bering Sea to the Kermadec I s 1 a n d s and X e w Zea I a n d, an il w e s t- w a r d t o between M a r i o n 1 s 1 a n d and the C r o z e t s ; iuthwe«t of I cel and; 144 3178 Metres) . . . Thaumatometra f not more than XV cirri. which have not more than 10 gments (abysses of the Pacific from west of Tasmania to west of Japan; 4680 — 5220 Metres) Bathymetra Hathrometra A. H. Clark. The following described species are referable to the genus Hathrometra : . isterias tenella Retzius, 1 783. Alccto dentata Say, 1825 (probably a synonym of tenella). Alecto sarsii Düben and Koren, 1846. Antedon prolixa Sladen, 1881. Antedon hystrix P. 11. Carpenter, 1884 (= prolixa Antedon exigtta P. H. Carpenter, 1888. Hathrometra norvegica A. H. Clark, 191 3. Trichometra A. H. Clark. Key to the Species of the Genus Trichometra. a' Over 40 cirrus segments; cirri XL — LX, 40 — 45, 20 mm. long, the last 15 — 20 segments about as long as broad; arms 60 mm. to 65 mm. long; Il'.r series and lower brachials narrow, entirely free laterally; rounded ventro- lateral pro may l>e developed on the elements of the IBr series and first brachials, but these do not meet across the interradial areas (Hawaiian Islands: 21 9 Metres vexator .1 Less than 35 cirrus segments 1>' more than 2^ (25 33; usually 27 — 30) cirrus segments of which those ond the twelfth to twentieth are about as long as broad cl 1 oi the IBi first two brachials only slightly convex dorsally and sharply and broadly flattened against their neighbors; arms }s mm. to 65 mm. long; cirri with 25 — 30 segments, 15 mm. to 22 mm. long; I', with 20 2^ segm 6 mm. long; I', with to segments, 247 4 'ram. long (f r o m the eastern part of the Gulf of Mexico and northern Cuba northward along the eastern coast of North America to the fis hing banks of Newfou n dland; 223—1219 Metres) . . . . , cubensis c3 ossicles of the IBr series and first two brachials strongly convex dorsally and laterally, just in lateral contact with their neighbors but not fiattened against them ; arms 37 mm. long; cirri with 27 — 33 segments; P1 with 21 — 23 segments; Pa with 13 segments, half as long as Vï (fnom the Bay of B i s c a y northward to the western coast of Ir eland [53°58' N., 12° 24' W.]; 687—2030 Metres) delicata b3 not more than 20 cirrus segments of which the distalmost are (slightly or considerably) longer than broad c1 20 cirrus segments of which the longest is a little more than twice as long as broad, and the distal are only slightly longer than broad ; ¥l 7 mm. long with 20 segments of which the basal three or four are short, the distal elongated ; P3 shorter, with 1 2 segments of which the basal four are short; distal pinnules 9 mm. long; arms 65 mm. long; cirri 10 mm. long (so u th wes ter n Japan; "Korea"; 650 Metres) . . isis c3 12 — 15 cirrus segments which are greatly elongated, the antepenultimate being over three times as long as its proximal diameter and the penultimate about twice as long as broad; P, very slender and filiform, with the first three segments about as long as broad; P3 and following with a gonad; arms 13 mm. long; cirri 4 mm. long (coast of Brazil; 1472 Metres) minutissirria 1. Trichometra vexator A. H. Clark. A. H. Clark. Proc. U.S. National Museum, vol. 34, 1908, p. 217 {Trichometra vexator). 2. Trichometra cubensis (Pourtalès). POURTALÈS. Buil. Mus. Comp. Zool.-, vol. 1, 1869, N° 11, p. 356 {Antedon cubensis, part; of the two specimens here described the larger is the type of this species, the smaller of Atelecrinus cubensis P. H. Carpenter [== Atelecrinus balanoides\ ). P. H. Carpenter. Buil. Mus. Comp. Zool., vol. 9, 1881, N° 4, p. 165 {Antedon cubensis). A. H. Clark. Proc. U.S. National Museum, vol. 34, 1908, p. 229 [Trichometra aspera). Fisheries, Ireland, Sci. Invest. 1912, N° 4, p. 3 (North American species of Trichometra most closely related to T. hibernica). HarïLAUB. Memoirs Mus. Comp. Zor>l., vol. 27, 1912, N° 4, p. 3S5 (part), pi. 9, figs. 10 — 12 (but not fig. 13); pi. 15, fig. 3 (but not fig. 4) {Antedon cubensis; fig. 13, pi. 9, and fig. 4, pi. 15, represent Coccometra uigrolincata). The following reference refers to Atelecrinus balanoides : POURTALÈS. Buil. Mus. Comp. ZoöL, vol. 5, 1879, N° 9, pp. 214, 215 [Antedon cubensis). Specimens are at hand from the following localities: Gulf of Me* N- lat., S6° 07*00 W. hm i Metres -Albatros." Stat. 2400; National Museum). Between Savannah, • i, and Cape Charles (30°44'oo" N. lat, 79 26'cra W. long.); 767 'Albatross" Stat. 2415; Cat. N U. S. National Museum). ireen the Bahamas and ( 1 ear, South Carolina 29 [6 30 N, lat., 50 W. Ii •Albatross" Stat. 2661; 1 at. Y' 14701 U.S. National Museum . Between the Bahamas and Cape Fear i _V 39' 00" N. lat., 790 49*00 W. long.); 758 Metres •Albatn Cat. \" 14700 au. 1 14711 U.S. National Museum). Between the Bahamas and Cape Fear (30°47'30"N. lat., 79 4900 W. tong.); 486 Metres •Albatross" Stat. 2666; Cat. N" 14703 and 22678 U.S. National Museum). Between the Bahamas and Cape Fear (30° 58' 30" N. lat., 79°38'3° xv- tong-); 529 Metres -\li.it! I at. \' [4697 and 34636 U.S. National Museum). Between the Bahamas and Cap< Fear (3i°09'oo"N. lat., 79°33'3°'w- l°ng.); 634 Metres •Albatross" Stal Cal N 16286 U.S. National Museum). Sable, Nova Scotia (4i°47'oo N. lat., "5°37'3°"w- tong.); 1219 M batrOSS" Stat. 2528; Cat. N" 24085 U.S. National Museum". Sable [sland 43 [6 N. lat., <',oQ35'\V. long.); 630 Metres (Cat. N" 35891 U.S. National Museum |. ithwestern part of Banquereau Bank; 540 Metres (Cat. N" 35890 U.S. National Museum) Banquereau Bank; 450 Metres Cat. N" 35J 12 U.S. National Museui Fishing Ban . N 35889 U.S. National Museum. 1111 3. Trichometra delicata \. 11. Clark. A. H. CLARK. Buil. du Mus. duist, nat., Paris, 191 1. N" 4, p. 258 {Trichometra delicata). Fisheries, Ireland, Sci. [nvest, [912, N° 4, p. 3 [Trichometra délica 4. Trichometra isis (A. II. Clark). A. II. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 82 {Antedon isis). — Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. 191 {Thaumato- metra . Trichometra minutissima (A. II. Clark). .\. II. CLARK. Proc. U.S. National Museum, vol. 34, [908, p. -1 ; ', Bathymetra minutissima). Fariometra A. II. «huk. Key t" the Species <>\ the <'irmis Fariometra. ' entrodorsal sharply conical with straight sides, nearly or quite as long as broad at the base B' second brachial longer than broad; centrodorsal ;,.^ mm. in diameter at the Bas. north of northeastern Celi Metres) rcutifera ond brachial broader than long distal angles ,,f the [Br, broadly roundi tnd the lateral angles of the axillaries produced beyond them, formin rhombic water pores betwi 249 the IBr series; similar conspicuous pores occur on the line of the articulation betvveen the first and second brachials (west of Celebes; 724 Metres) dione c" ossicles of the division series and first two brachials in close lateral contact throughout, in small specimens through ventrolateral processes ; distal angles of the IBrx slightly produced, overlapping the proximal portion of the lateral angles of the axillaries ; lateral edges of the first brachials sharply and broadly flattened; cirri with 25 — 28 segments of which the longest are from two to three times as long as the diameter of the much expanded and overlapping distal ends, and the last seven to ten are about as long as broad; arms about 50 mm. long (Philippine Islands; 509 — 13 14 Metres) explicata 1. Fariomctra scutifera sp. nov. Stat. 119. i°33'.5 N., i24°4i'E. Celebes Sea. 1901 Metres. 2 Ex. The centrodorsal is sharply conical with straight sides, 3.5 mm. in diameter at the base and 3.0 mm. from the apex to the interradial border, thickly covered with very numerous cirrus sockets. The distal border of the radials is even with the rim of the centrodorsal in the median line, and is slightly produced — very much less than in most species — ■ in the interradial angles; the distal angles are slightly separated. The IBfj are very short, eight to ten times as broad as the median length, the proximal border parallel with the curved distal border of the radials, the distal border on either side of the median line convex, nearly parallel with the concave proximal sicles of the axillaries. In direct lateral view (viewed at right angles to the dorsoventral axis) the IB^ appear almost or quite bisected by the posterior process from the axillary. The bases of the IB^ are widely free laterally. The IBr3 (axillaries) are about as broad as long with the anterior angle considerably produced ; the lateral angles project somewhat beyond the clistal angles of the IBi-j so that narrow elongate water pores are formeel. Neither the IBi^ nor the axillaries have ventrolateral processes. The first brachials are extremely short in the median line, very slightly longer in median length, but becoming four to five times as long externally ; their inner sides diverge at approxi- mately a right angle. ^ The second brachials are longer than broad, rather sharply convex dorsally, with the proximal sides rather strongly concave so that a relatively long and narrow process incises the first brachials. The arms are all broken at the syzygy between the third and fourth brachials. The eversion of the distal edges of the brachials and the development of spines along these edges are almost obsolete. In a smaller specimen the centrodorsal is sharply conical, slightly higher than broad at SIBOGA-EXPEIHTIE xlii£. 32 the base; the axillaries an r than broad with ;i strongly produced distal angle and an [ually long, but bn ss which rises into a faint rounded median carination; tlit l brachials are much longer than broad with a faint median carination running their •ire length; and the following brachials are slightly raised in the mid-dorsal line, the rai portion bearii ous very fine spines. 2. Fan • .' (A. 11. Clark). A. II. <■ LARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, [908, part 2, tetra explica ( of the Indian Ocean, 1912, p. 239 [Trichotnetra explicata). Specimens are at hand from the following localities: -t of Mindoro, Philippines, in 509 Metres ("Albatross" Stat. 5123; Cat. N" 25425 l'.S. National Museum). Ven Philippines, in 612 Metres ("Albatross" Stat. 5 1 1 5 ; Cat. N" 36014 l'. S. National Museum). twan Passage, Philippines, in 1314 Metres ("Albatross" Stat. 5349; Cat. N" 36043 U.S. Nal kiseum). Fariometra dionc sp. nov. .t. 85. o°36'.5S., H9°29'.5 E. Makassar Straits. 724 Metres. 1 Ex. The centrodorsal is conical, the sides practically straight, 2.0 mm. in diameter at the i-e and 2.6 mm. from the apex to the interradial border, and is closely set with about one lnmdred rirrus sockets of which about one half appear to be of ftill size. The radials are just visible beyond the rim of the centrodorsal in the median line, but nd well up in the angles of the calyx ; their distal angles are slightly separated. Viewed perpendicularly to the plane of their dorsal surface the IBr, are very short and band-like, tïve to six times as broad as long, the proximal and distal borders parallel, the distal angles broadly rounded off and finely spinous. If the anima] is viewed at right angles the dorsoventral axis the IBr, are seen tp be very strongly convex dorsally and. since the plane of their mid-dorsal line is at right angles to that of the dorsoventral axis, they appear in I by thi ior process of the axillaries. The [Br axillaries are about as broad as long with very strongly concave sides; as a result of the broad rounding <>\ï of the distal angles of the [Br, their lateral angles, the proximal of which are horizontal, overhang for a very considerable distance the distal thi IBr, so that large rhombic water pores are formeel between the [Br series. There ar> Jateral pre on the elements of the IBr series, or on the first two brachials. first brachials are very short, the inner two thirds very narrow and band-like, the lly increasing in length so that th( Ier i from three to tour times inner, or the median length; interiorly their bases are not in apposition, and at somewhal more than a right angle. brachials are irregularly quadrate, somewhat broader than long: their inner 251 angles are just in contact interiorly forming, with the widely diverging inner edges of the first brachials, large rhombic water pores resembling those between the IBr series. The first syzygial pair (third and fourth brachials) is slightly longer inwardly than outwardly. The remainder of the arm is as in other species of the genus ; the eversion of the distal edges of the brachials is only slightly developed, and the spinosity is very fine. Pj has the first threè segments broader than long, the fourth and fifth slightly longer than broad, and the remainder elongated, very greatly so distally. Nepiometra A. H. Clark. Key to the species of the Genus Nepiometra. a1 Centrodorsal relatively large, 3.5 mm. in diameter at the base; IBi^ with the distal angles rounded off so that the lateral angles of the axillaries project bevond them forming prominent water pores (sou th west of Cape Comorin, the southern tip of India; 774 Metres) obscura a3 Smaller, with a relatively smaller centrodorsal which is never more than 3.0 mm. in diameter at the base b1 25 — 30 cirrus segments c1 larger, arms about 60 mm. long; cirri L — LX; earlier cirrus segments three times as long as the median diameter or even somewhat longer (Kei Is- lands; 204 Metres) alcyon c3 smaller, arms about 25 mm. long; cirri about XXX; earlier cirrus segments not more than twice as long as broad (Meangis Islands; 900 Metres) laevis b3 20 — 22 cirrus segments of which the loneest are twice as lono- as the diameter of the expanded distal ends; arms about 30 mm. long; distal intersyzygial inter- val two oblique muscular articulations c1 last four or five cirrus segments very slightly longer than broad; IBr series and first two brachials with straight sides which are just in contact laterally (off southern Celebes; 1158 Metres) io c3 last eleven cirrus segments broader than long; IBr series free laterally (Co cos I si and, off Panama; 1760 Metres) parvula 1. Nepiometra obscura (A. H. Clark). A. H. CLARK. Crinoids of the Indian Ocean, 1912, p. 240, fig. 45 {Tricliometra obscura]. 2. Nepiometra alcyon (A. H. Clark). A. H. Clark. Notes from the Leyden Museum, vol. 34, 191 2 [Thaumatometra alcyon). Stat. 251. 5°28'.4S., i32°o'.2 E. Arafura Sea. 204 Metres. 1 Ex. The centrodorsal is conical with the sides slightly rounded, half again as broad at the base as high, almost entirely covered with closely crowded cirrus sockets arranged in alternating rows as in Tricliometra and Hatliromctra. i'irri L — LX, :; usually 28), 18 mm. long; the longesl segments are about three • as long as the median diameter, or about twice as long as the lateral diameter of the what expanded distal ends; the terminal six or seven are slightly longer than broad; the short outer segments are laterall) compressed, though not carinate dorsally; the median portion of the distal border on the dorsal side is produced distally into a broad rounded overlapping ess with a serrate Th< radials are just visible beyond the rim of the centrodorsal ; their distal ai ire slightly separati The IBr tremely shorl and band-like, four times as broad as the lateral length, which is nearly or quite tv. jreat as the median length; the sides are distinctly convergent. The [Br axillaries are rhombic, about as broad as long. with all the sides rather deeply project a considerable distance beyond the distal angles of the narrow IHr,. I.' first brachials are very short, basally not quite in apposition internally, the inner most a straight line. All the brachials have slightly everted and finely spinous . As a whole the division series and arms resemble those of Thaumatometra tennis. .-.een the third and fourth brachials, again between the ninth and tenth and teenth and fifteenth, and distally at intervals of two oblique muscular articulations. 1' is weak and r, 7 mm. to 9 mm. long with 19 — 23 segments of which the first four are about as long as broad and the following slowly increase in length so that the outer are twice as long as broad or sömewhat longer, with moderately produced and spinous distal ends. and the terminal slender and much elongated. P, is about 10 mm. long with 16 ents of which the first two are about as Ion- as broad, the third and fourth twice as long e median diameter, and the following greatly elongated: the pinnule is considerably stouter than Pj, and may ln-ar a fusiform gonad on the fifth-eighth segments. The distal pinnules are 10 mm. long with about 15 segments which have much expanded anterior. and overlapping and finely spinous distal, ends. The arms are probably about 60 mm. long. ;. Nepiometra laein 1'. II. Carpenter). 1'. II. Carpi "Challenger" Reports. Comatula< p. 187, pi. 31, fig. 6 {Antedon lat 4. Nepiometra io nom. 1 1'. II. CARPENTER. "Challenger" R< omatulae, [888, p. 170, pi. 32, fig. 0 (? Antedon alternato :i Stat. 2 A. II. Clark. ' >m the Leyden Museum u • p 1 ; [Trichometra delicata; not <>f .\. II. Cl ARK, ioi 1 . Smithsonian Miscellaneous Collections, vel. Trichometra ïdelt t. 211. 5°4o.7S.. [20 45'.5 E. Banda s .1 Ex. ntrodorsal is rounded conical, about 1.2 mm. broad at the base and about from to the interradial border, similar i". but very slightly longer than, the centrodorsal of the specimen shown in fig. 6 on pi. 32 of the "Challenger" report; it is almost entirely covered by about forty closely crowded cirrus sockets ; the small bare polar area has a few lono; tubercles. The cirri are about XL, 21 — 22, about 10 mm. in length ; the first segment is short, the second nearly or quite as long as the diameter of the expanded distal end, the third half again as long as the diameter of the expanded distal end, the fourth and fifth the longest, twice as long as the diameter of the expanded distal ends; the following gradually decrease in length so that the last four or five are only very slightly longer than broad ; the longer earlier segments have broadly expanded overlapping distal ends, this character becoming less and less pronounced distally, and absolete on the terminal segments where there is only a slight ventrolateral overlap; the short distal segments develop a slightly carinate dorsal spine. The radials are very short in the median line, but extend well up in the angles of the calyx so that the bases of the IBrt are not in apposition. The IBr-j are very short, about five times as broad as long in the median line, slightly longer laterally than centrally; the lateral borders are parallel; the distal edges, except in the median line, are everted and finely spinous; the proximal border is slightly everted ; there is a tuft of spines on the distal angles. The IBr2 (axillaries) are almost triangular, slightly broader than long; the distal edges are slightly everted and very finely spinous; the lateral angles are covered with spines. The IBr series and lower brachials are in lateral contact except for small "-)-" shaped water pores. The arms are about 30 mm. long; the brachials have only very slightly produced and very finely spinous distal ends. The distal intersyzygial interval is two oblique muscular articulations. The specimen of " Antedon a/temaia" represented in fig. 6 of pi. 32 of the "Challenger" report, which was dredged north of New Guinea. in 1926 Metres, certainly belongs to the genus Nepiometra, and very possibly to this species. 5. Nepiometra parvula (Hartlaub). Hartlaub. Buil. Mus. Comp. Zool., vol. 27, 1895, X° 4, p. 144, pi. 3, fig. 21 {Antedon parvula). Phrixometra A. H. Clark. The only species in the genus Phrixometra is 1. Phrixometra longipinna (P. H. Carpenter). P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 185, pi. 30, figs. 1 — 3 {Antedon longipinna). Bathymetra A. H. Clark. Key to the Species of the Genus Bathymetra. a1 Centrodorsal low, subconical, about half as high as broad, the cirrus sockets enly distributed over its surface; basal portion of anima] widening rapidly in .1 broad curve, reaching the maximum width at the axillary; radials short, more than twic<- as broad as long in the median line, their dorsal profile, which is nvex, making an angle of about 90 with each other, or of f.50 with the dorsoventral a est of ras man ia; |.6 1 Metres) carpenteri .1 Centrodorsal aboul .is high as broad at the base, bearing cirri only al t the dorsal pole, the basal half or mor.- being smooth and without cirrus sockets; basal portion of the animal constricted, the sides of the IBr series and arm bases, which make approximately a straight line, diverging slowly at the verj smal! angle with the dorsoventral axis so that the maximum width is at the height of the hial; radials longer, twice as broad as long in the median line, the dorsal profiles, which are concave, making an angle of 6o° with each other. or of 300 with the dorsoventral axis (west of Japan; 5220 Mei abyssicola 1. Bathymetra carpenteri \. 11. Clark. 1'. II. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. [91 (part), pi. 33, fig. 2 (not fig. 1 ' {Antedon aby \. II. CLARK. Proc. U.S. National Museum, vol. 34, 190S, p. 235 [Bathymetra carpenteri). 2. Bathymetra abyssicola (P. II. Carpenter). 1'. II. CARPENTER. "Challenger" Reports. Comatulae. 1888, p. im part), pi. n, fig. 1 (but not fig. 21 {Antedon abyssid Thaumatometra A. II. Clark. Key to the Species of the Genus Thaumatometra. a' Larere, the arms being trom [ 10 mm. to 1 xo mm. long: 1', 20 mm. Ion? with 35 segments of which the proximal 12 are short and wide, mostly wider than Ion-, and thi l! 2;, are elongated and slender; 1', slightly shorter with 20 segments <>f which the 2 basal are wider than Ion- and the distal to are much elongated, the basal ro carinate; following pinnules similar to 1' . cirri XL — L, 20. 35 mm. Ion- western part of the Sea fapan and the Gulf of I ar tarj from Korea northward t o k hal in I si and to 17 38 \o" N.] ; 144 -1110 [; [440 Metres). . tenuis -maller, the arms never over 45 mm., and very rarelj over 30 mm. in Iength; I', with not over 20, anti rarely over 15 segments; cirri with a maximum of 18; and rarely over 15 segim ually 15, cirrus segments, of which tl from tl 1 .i- times as Ion- as th imal diami l ents much elongated, subequal, the antepenultima out 255 three times as long as the proximal width, the penultimate twice as long- as broad; distal edges of the cirrus segments much expanded; cirri about XXX, 15 — 18; arms about 30 mm. long; Pl slender and delicate, with 10 — 12 elongated segments; P„ and the following pin- nules longer, with stouter segments and a gonad (between Marion Island and the Crozets; 2880 Metres) abyssorum c2 cirrus segments much elongated proximally but becoming shorter distall}' so that the last two are never more than twice as long as the proximal width; distal edges of the cirrus segments, especially of the outer, less produced d1 distal cirrus segments shorter, the last three or four being less than twice as long as broad e1 centrodorsal hemispherical ; cirri XXV — XXXV, 1 5 ; arms 25 mm. long (southern Japan; 1395 Metres) cypris e~ centrodorsal much flattened, almost discoidal; cirri XL — LX; arms between 30 mm. and 45 mm. long f1 cirri XL — XLV, 13 — 17 (usually 15), 8 mm. long; arms about 45 mm. long (Yezo Strait, Japan; 540 — 959 Metres) comaster f3 cirri LV — LX; arms probably between 30 mm. and 35 mm. long (sou th west of Cape Comorin, the southern tip of India; 774 Metres) p/ana1) d* distal' cirrus segments longer, the third and fourth from the end of the cirrus being distinctly more than twice as long as broad e1 Px has 15 — 20 segments f1 IBr series and first two brachials very strongly convex dorsally, entirely and widely free laterally; IBi-j with strongly converging sides, the lateral angles of the axillaries projecting for a con- siderable distance beyond their distal angles ; axillaries about as broad as long; cirri about XL, 1,5 — 16; cirrus segments more elongate, the proximal with more strongly produced distal ends (south of Sumbawa; 959 Metres). . . . thysbe f2 IBr series and first two brachials in lateral contact; axillaries much broader than long; cirri XXV — XXXV, 15; distal cirrus segments less elongate, the proximal with less strongly produced distal ends (northeast of New Zealand and near the Kermadec Lslands; 1134—1260 Metres) . alternata ê Pj has 11 segments; cirri XXX— LX, 14; arms about 23 mm. long (western Bering Sea; 3178 Metres) brevicirra I) The cirri of this species are not known, but it seems to belong here. 256 i : cirrus segments cirrus segments shorter, the Ion third and fourth) between three 1 tour times as long as broad; antepenultimate about twice .is long .1- broad; penultimate about half again ;is long as broad; cirri about XXX. [o [2, 9 mm. long; arms about 30 mm. long; I' 6 mm. long with 15 segments, of which the second and third are aboul as long as broad, very slender; 1' verj slightly shorter, with the first segment short, the second about as long as broad, the third half again as long as broad, and the following elongated; 1' bears a gonad Sagami Bay, Japan; :\<> — 477 Metres) parva cirrus segments longer, the Ion óurth and fifth) nearly or quite si\ times as long as the proximal breadth; segment preceding the ante- nultimate three times as long as broad; antepenultimate twice as long as broad; penultimate half again to twice as long as the distal diameter; cirri XXX. i<>, 6 mm. long; 1', somewhat longer and stouter than 1', southwest of [celand; 2043 Metres) ...... septentrionalis 1. Thaumatometra tennis ,.\. II. Clark). GRAFF. "Challenger" Reports. Myzostoma, 1S84, p. 79 (? Antedon sp.; Yladivostock). A. H. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 80 (Antedon tennis); p. Si 'edon cil. Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 1909, p. [91 [Thaumato- 1 tennis). 2. Thaumatotnetra abyssorum (P. H. Carpenter). 1'. II. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 190, pi. 29, figs. 10 — 13 {Antedon Thaumatometra comaster A. H. Clark. A. II. CLARK. Proc. U.S. National Museum, vol. 34, [908, p. 232 (Thaumatometra comaster). 4. Thaumatometra cypris A. II. Clark. 1'. II. Carpi "Challei imatulae . pi. 32, figs. 5. 7. 8,9 •>. alterna A. II. Clark. Smithsonian Miscellaneous Collections, vol. 61. 1 ,1 ;. V 1;. p. 65 (Thaumato- ■r,i erf) . Thaumatometra alternata I'. 11. Carpe I'. II. CARPENTl Intedon tennis; nomen nudum). F. "Ch nger" R Intedon n/te/ uien nud 1'. II. Carpenti . -' 1 r" Report ttulae, [888, p. 170 (part, pi. [8, figs. 1 — 3 n alterna A. II. CLARK. Smithsonian Miscellai N 15, p. 65 Thaumato- ^57 6. Thaumatometra thysbe A. H. Clark. A. H. Clark. Xotes from the Leyden Museum, vol. 34, 191 2, p. 149 {Thaumatometra thysbe). Stat. 52. 9°3'.4.S., H9°56'.7E. Savu Sea. 959 Metres. 1 Ex. The centrodorsal is small, rounded conical. The cirri are about XL, 15 — 16, 9 mm. long; the lïrst segment is short, the second about as long as the diameter of the expanded distal end, the third tvvice as long as the diameter of the expanded distal end, and the fourth slightly longer; the following very slowly decrease in length so that the last two before the penultimate are from one third to one half again as long as broad; the earlier segments have greatly enlarged ends, the distal end being much expanded and overlapping the base of the succeeding segment; as the segments become shorter the dorsal and ventral profiles become straighter and the segments become compressed laterally so that they appear broader in lateral view ; on the distal short segments the median portion of the distal edge on the dorsal side projects slightly over the base of the following segment. In the median line the radials are just visible beyond the edge of the centrodorsal, but they extend well up in the angles of the calyx; their distal angles are slightly separated so that the bases of the IBi^ are not quite in apposition. The IBi'j are very short, almost oblong, about four times as broacl as the exterior length, which is slightly greater than the median length; the lateral borders of adjacent IBrj make an angle of about 900 with each other; the distal edges are narrowly everted and very finely spinous. The IBrt (axillaries) are about as broad as long; the distal edges make approximately a right angle with each other ; the distal angle is not produced ; a broad posterior process incises the IBr, ; the lateral angles extend considerably beyond the distal angles of the IBi'j ; the distal edges are evenly and very finely spinous. The arms are 30 mm. long and resemble those of the other species of the genus; the distal edges of the brachials are moderately everted and finely spinous. Syzygies occur between the third and fourth brachials, again between the ninth and tenth and fourteenth and fifteenth, and distally at intervals of two oblique muscular articulations. Pj is excessively delicate, about 6. 5 mm. long, composed of 1 5 + segments of which the first is very short, the second longer, the third about as long as broad, the fourth half again as long as broad, the following becoming exceedingly elongated with swollen, produced and overlapping spinous distal ends. P., is stouter than Pn composed of 1 1 or 12 segments of which those beyond the third are excessively elongated, becoming exceedingly slender distally; the fourth-seventh segments bear a lartje denhal w-land. 7. Thaumatometra brevicirra (A. H. Clark). A. H. Clark. Proc. U. S. National Museum, vol. 34, 1908, p. 235 {Bathymetra brevicirra). 8. Thaumatometra parva A. H. Clark. A. H. Clark. Proc. U.S. National Museum, vol. 34, 190S, p. 231 {Thaumatometra parva). SIBOGA-EXPEDITIE XUl£. 33 258 Thaumatometra septenirionalis \. II. Clark. A. II. Clark. Die Crinoidcn der Antarktis, 1915, p. [47 "unbenannte Art vom Gebiet süd- westlich \ on Island" . 1 lescription in press. Thaumatometra plana (A. 11. Clark . A. 11. CLARK. Crinoids of the [ndian Ocean, 1912, p. chometra plana). Orthometra A. II. l The only species in the genus Orthometra is 1. Orthometra hibernica i.\. II. Clark). A. 11. CLARK. Fisheries, [reland, Sci. Invest., 1912, X" 4, p. 2 [Trichometra hibern Tonrometra A. H. Clark. Key ti) the Species of the Genus Tonrometra. a None of the cirrus segments longer than the diameter of the much expanded distal ends; arms 10 mm. long ; cirri XXX, t8- 20. 4 mm. long least of H a 1- m ah era iGiloloj; 1089 Metres) brevipes a Longest proximal cirrus segments longer than the diameter of the much expanded distal ends : arms probably about 40 mm. long; cirri XX — XXX, nearly 20 n Marion Island and the Crozets; 2880 Metres) remota 1. Tonrometra brevipes \. 11. Clark). A. II. CLARK. Notes from the Leyden Museum, vol. 34, [912, p. [47 {Trichometra brevipes). Stat. 150. o°o6' N., 129 7'. 2 E. Halmahera Sea. [089 .Metres. 1 Ex. The centrodorsal is low conical, twice as broad basally as high, bearing about thirty |y crowded and irregularly placed cirrus sockets which have very prominent rims. i In cirri are about XXX, iS 2'». about 4 mm. long; the first segment is very short, the second is about as long as the median diameter, the third-fifth or -sixth are the longest, about as long as the diameter of the expanded distal ends; the following gradually decrease in length s'o that the outermosl nine .or ten are slightly broader than long-, the longer earlier segments are constricted centrally with greatl) expanded and overlapping distal ends, this rapidly decreasing as the segments become shorter; the short outer segments are sub- te dorsally, and bear a slight dorsal spine. The radials are concealed l>y the centrodorsal. The llir, are extremely short, and are in close lateral apposition; the lateral edges are tij everted. 259 The IBr, (axillaries) are nearly as broad as long, almost triangular, the lateral angles jüst in apposition with the lateral angles of the adjacent axillaries, and bear a moderately developed rounded posterior process. The edges of the ossicles of the IBr series and of the brachials are prominently everted and spinous; the dorsal surface of the lower brachials is also more or less thickly covered with very fine spines. There is a faint shallow median groove on the IBrj and IBr3. The ends of the proximal cirrus segments are very spinous, and their dorsal surface is slightly carinate. Px is excessively delicate ; the segments after the third are greatly elongated with expanded and finely spinous distal ends. 2. Tonrometra remota (P. H. Carpenter). P. H. Carpenter. "Chaüenger" Reports. Comatulae, iSSS, p. 1S4. pi. 29, figs. 5 — 9 {Antedon remota). A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 66 [Thaumato- metra remota). II. Family Pentametrocrixidae A. H. Clark. Key to the Genera of the Pentametrocrinidae. a1 Ten radials and ten (undivided) arms Thaumatocrinus a3 Five radials and five (undivided) arms Pentametrocrinus Thaumatocrinus P. H. Carpenter. Key to the Species of the Genus Thaumatocrinus. a1 Small species with a small centrodorsal which bears fewer than twenty cirri b1 cirri XV — XX, excessively slender, with enormously elongated segments of which the third is about four times as long as the diameter of the expanded proximal end, and the fourth is six times as long as its proximal diameter (extreme south of the Indian Ocean) . renovatus -1) \y cirri XI — XIII (very rarely more), slender, but not excessively so, with less elongated segments than in the preceding, the third never being more than twice as long as broad, and the fourth usually less than four times as long as the diameter of the expanded ends (south west of I celand) . jungerseni a2 Larger species with a large and broad centrodorsal which bears more than forty cirri b1 second brachial more than twice as long as the first, which is dispropor- tionately small (southern Japan) borealis 1) Synonym Promackocrinus abyssorum P. H. Carpenter. 2 6o li second brachial n«>t appreciably longer than th<- first proxima] portion of the arms broad, very rugged, and with the articular tubercles very strongl) i Hawaiian Islands) rugosus proxima] portion of the arms only very slightly enlarged, smooth, without any ti articular tubercles (Meangis Islands and Moluccas naresi i. Thaumatocrinus naresi (P. II. Carpenti 1'. II. CARPENTER, Proc. Roy. Soc, vol. 28, p. ;vs? [Promachocrinus naresi). ■Challenger" Reports. The Comatulac p. 352, pi. 69, figs. 8 — \o (Promachocrinus naresi . Stat. 122. 1 s8'.5 N., r25°o'.sE. Sangi Islands, northeast of Celebes. 1264 — 1165 Metres. 1 mutilated Ex. The > i-ntrodorsal is very low hemispherical with a strongly flattened dorsal pole, and measures 6 mm. in diameter. !t bears XXXVcirrus sockets in three closely crowded alternating rows. The ten radials are in mutual apposition all around the calyx, being only slightly separated at the distal angles; they are short, projecting beyond the centrodorsal for a distance equal to trom one third to one half the length of the first brachial. H of lhc The first brachials are approximately oblong-, averaging twice as broad as long: the second brachials are similar, of about the same size or slightly shorter. The arms from the distal edgfe of the radials to the distal edije of the of the rt ö fourth brachial (the first syzygy) mcasure 6 mm. Thaumatocrinus óorea/is, which I recently combined with Th. naresi as a synonym, is in reality a perfectly good species. It is readily distinguished from the allied species by the small size of the t:rst and the large size of the second brachials, the latter being nearly or quite twice as large as the former. In 77/. naresi the first three brachials are all of about the same size. 77/. dorealis is larger and more rinjfs/ed and robust than 77/. naresi. Pentametrocrinus A. H. Clark. Key to the Species of the Genus Pentametrocrinus. \ pinnule on the second brachial; cirri greatly elongated, straight for mosl of the length, gently recurved at the tip, tapering to a point, composed of 18- 22 segments; all the cirrus segments iexcept the basal) greatly elongated; terminal claw minute, conical (Baj of Bengal to the East Indies, the Philippine Islands and southern Japan varians first pinnule on the fourth brachial greatly elongated, itraighl for most of the length, gently recurved at tip, tapering to a point, composed of 25 30 segments; all the cirrus 2ÓI segments (except the basal) greatly elongated; terminal claw minute, conical c1 disk completely covered with small calcareous granules (New Zealand and New South Wales to the East Indies) semperi c" disk naked (southern Japan to Celebes and the Paternoster I s 1 a n d s) japonicus b" cirri of medium length or short, more or less recurved throughout their entire length, composed of 14 — 17 segments; terminal claw recurved and hook-like c1 articular tubercles very strongly developed, giving the arms a very rugged appearance (sou thern Japan) iuberculatus c3 articular tubercles not developed, so that the arms appear smooth d1 disk naked (southern Japan to the Philippines) diomedeae d: disk completely covered with small calcareous granules (north- w es tem Africa to western Ireland; Caribbean Sea). . atlanticus 1. Pentametrocrinus diomedeae A. H. Clark. A. H. CLARK. Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 52, part 2, p. 234. Stat. 95. 7°43'.5 N., H9°4o'E. Sulu Archipelago. 522 Metres. 5 Ex. The best preserved specimen has the cirri 27 mm. long with 17 — 18 (usually 18) segments. It agrees well with a specimen from "Albatross" Station 5173 (between Mindoro and Luzon, Philippine Islands) which has the cirri 22 mm. long, composed of 14 — 16 segments, which are of the same relative proportions as those of the individual under consideration, but is somewhat smaller. The difference in size probably accounts for the difference in the length of the cirri and in the number of the segments. The type of P . diomedeae, from southwestern Japan, has 14 — 17 cirrus segments. Of the other specimens one resembles the one just noticed, and the other three are small. One of the latter has the cirri 15 mm. long, composed of 14 — 15 segments. 2. Pentametrocrinus japonicus (P. H. Carpenter). P. H. Carpenter. Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 499 [Eudiocrinus japonicus). "Challenger" Reports. The Comatulae, p. 84, pi. 7, figs. 1, 2 {Eudiocrinus japonicus). Stat. 38. 7°35'.4S., ii7°28'.6E. Flores Sea. 521 Metres. 1 Ex. Stat. 74. 50 3.5 S., u 90 o' E. Makassar Straits. 450 Metres. 1 Ex. The specimen from Stat. 38 is typical, agreeing well with the type in London and with numerous specimens from southern Japan in the United States National Museum. lts cirri are 35 mm. long, composed of 26 segments. The individual from Stat. 74 has the cirri 50 mm. long, composed of 35 segments-, it is slightly la.rger than the preceding, nearly as large as the largest "Albatross" specimen from southern Japan. 26 2 /'. ntam t ' ■ n P. 1 1. Carpentei 1'. il. i Journ. 1 .in ti. Soc. Zool.), vol. i6, [882, p. 497 «Cha Reports. The Comatulae, p. 82, pi 1. 1-3. ,; .; I Banda Sea. 1 158 Metres. 2 Ex. imens agree well with the types in the British Museum; neither possesses cirri. nor arms beyond the first syzygy (between the fourth and fifth brachials). < In one arm of one of the specimens the first brachial is repeated .is a smal! ossicle aboul one half the sizc of the normal first brachial, and of al/out half the width, being n the normal first brachial and the second brachial; the articulations between the normal and the supernumerary first brachials, and between the latter and the second hial, are both synarthries. 4. Pentametrocrinus varians (P. II. Carpenter). 1'. II. CARPENTER. Journ. Linn. Soc. (Zool.), vol. 16, 1S82, p. 496 [Eudiocrinus varians). — "Challenger" Reports. The Comatulae, p. Si, pi. 7, figs. 3—7 [Eudiocrinus varians). St.it. 4.5. 7 24 S.. 1 iSD 1 5 .2 K. Flores Sea. 794 Metres. 2 Ex. Stat. 4S. 8°4'.7S., mS°44'.3 !•:. Flores Sea. 2060 Metres. 2 Ex. St.it. ;,i4. 7°3 interradial furrows between the cirrus sockets, reater height of the lateral ridges bordering the cirrus sockets, and the absence of notches proximal border. 269 2. Atelecrinus anomalus A. H. Clark. A. H. Clark. Notes frofn the Leyden Museum, vol. 34, 191 2, p. 153. Stat. 177. 2°24'.5S., I29°38'.5E. Ceram Sea. 1633 Metres. 1 Ex. Centrodorsal very long, about 1.8 mm. braad at the base and 3 mm. long radially, cylindrical in the proximal third, from that point onward (beginning rather abruptly) conical ; the apex is rounded. The cirrus sockets are moderate in size, and are arranged in ten evenly spaced columns, three (rarely two or four) to a column. Each column is separated from its neighbors in the same column by about the distance that the columns are apart. The surface of the centro- dorsal is smooth and undifferentiated ; the cirrus sockets are simple excavations, without the raised borders usually found in the species of this genus; in each cirrus socket just above the midclle a half conical ridse makes in from either side; these ridges are triangular in outline, the apex of the triangle abutting on the central canal. The ligament areas above (proximal to) these ridges are rounded proximally, the sides converging in a sharp angle at the central canal ; their area is approximately equal to that of the ridges ; the ligament areas below (distal to) these ridges are shallower, occupying about half the area of the cirrus socket or rather more. The interradial portions of the centrodorsal just below the basals are slightly raised above the general surface, so that a section of the centrodorsal through the base is rouncled- pentagonal. The cirrus sockets occur almost exclusively on the conical outer two thirds of the centrodorsal. The cirri are XXX, 19 — 20, about 13 mm. long ; the first two segments are about twice as broad as long, the third is slightly broader than long, or about as long as broad, the fourth is twice as long as the diameter of its ends, the fifth is nearly or quite three times as long as the diameter of its ends, and the sixth is slightly shorter; the following decrease gradually in length, so that the fourteenth and following are only slightly longer than broad; the fourth-seventh are moderately constricted centrally, but this central constriction disappears in the next two or three following, when the cirri become strongly compressed laterally. The opposing spine is terminal, small and blunt. The terminal claw is slightly longer than the penultimate segment, rather stout, evenly tapering, and rather strongly curved. The short cirri of the species, which have short segments distally ancl a stout strongly curved terminal claw, are very different from the very long and slender type heretofore supposed to be characteristic of the species of Atelecrinus. It seems that in Atelecrinus we iig. 17. I.ateral view of a specimen of Atelecrinus anomalus from Stat. 177. X 6- (Courtesy of the L'. S. National Museum). .i strict parallel to the conditions found in the Pentametrocrinus, the cirri ol the Atele- us anomalus type being characteristic of such species as Pentametrocrinus tuberculatus and and those of the .-/. balanoides or .7. conifer type occurring in such form /'. . or /'. k.s. Xh( very large and consp broadly seven sided, in contact laterally for a d ial to about half the greatest (median length; the proximal edge of the ring the swollen interradial portion of the centrodorsal is slightly concave; the two proximal edges are of about the same length, hut straight; the anterior angle ol the roadl) obtuse, and is of the same degree as the midradial angle made by the . edges of adjacent basals over the proximal edge of the centrodorsal. The side-, ol isal ring are parallel, so that the hasal ring continues the column made by the columnar al third of the centrodorsal. The radials are slightly broader than long, in lateral contact throughout their entire length; their interradial angles are somewhat produced. Proximally the radials are slightly rounded dorsallv. becoming more strongly rounded distally, especially at the sides. so that at distal portion of. the interradial areas there is a well marked interradial furrow. The IBr, are proximally about as broad as the lateral length, and distally slightly Ier than the lateral, though not quite twice as broad as the median, length-, the lateral lencrth is half again as great as the median length. due to incision by a process trom the axillary. The lateral edges are straight, diverging somewhat, and entirely free. The axillaries are rhombic, the lateral angles slightly truncated and continuing the direction of the lateral edges of the IBr,: the anterior angle and the posterior process incising the IBr, are about equally produced, and are similar; all tour edges are slightly concave. The first brachial is wedge shaped, with the proximal and distal edges slightly concave, and is about as broad as the external (greater) length; the internal length is not much more than half the external length: the internal edges are entirely free. The second brachial is larger than the first, irregularly quadrate. The third brachial is nearly twice as long interiorly as exteriorly, about as broad as the exterior lenght.'The arms are not preserved beyond the syzygy between the third and fourth brachials. The length of the specimen from the tip of the centrodorsal to the syzygy between the third and fourth brachials is 9 mm. STATION LIST SHOWING THE ASSOCIATION OF SPECIES AT THE DIFFERENT LOCAL1TIES. STATION 33. Bay of Pidjot, Lombok. 22 Metres and less. Mud, coral and coral sand. Capillaster multiradiata, Comatula micraster, Comantheria briareus, Comanthina schlegelii, Amphimetra jacquinoti. STATION 37. Sailus ketjil, Paternoster Islands. 27 Metres and less. Coral and coral sand. Capillaster multiradiata, Comatula purpurea, Comaster minimus. Station 38. Paternoster Islands (j° 35'. 4 S., 1 170 28'. 6 E.). 5 2 1 Metres. Coral. Psathyrometra inusitata, Psathyrometra sp., Pentametrocrinus japonicus. STATION 40. Anchorage off Pulu Kawassang, Paternoster Islands. 12 Metres. Coral reef. Capillaster multiradiata, Comanthus parvicirra, Stephanometra echinus, Colobometra perspinosa. STATION 43. Anchorage off Pulu Sarassa, Postillon Islands. Down to 36 Metres. Coral. Comatella nigra, Comanthus annulata, Comanthus parvicirra, Dichrometra flagellata. Station 45. North of Sumbawa (7°24'S., 1180 15'.2 E.). 794 Metres. Fine grey mud, with some radiolarians and diatoms. Thalassometra margaritifera, Psathyrometra major, Psathyrometra mira, Psathy- rometra inusitata, Pentametrocrinus varians. STATION 47. Bima Bay, Sumbawa, near south fort. 55 Metres. Mud, with patches of fine coral sand. Capillaster multiradiata. STATION 48. North of Sumbawa (8°4'.7 S., 1 18°44'.3 E.). 2060 Metres. Fine grey mud, in part green. Psathyrometra minima, Pentametrocrinus varians. STATION 49a. Sapeh Strait. 8°23'.5S., II9°4'.6E. 69 Metres. Coral and shells. Capillaster multira- diata, Comatula purpurea, Comatula pectmata, Comantheria weberi, Catoptometra ophiura, Eudiocrintts serri- pinna, Liparometrd articulata, Mariametra vicaria, Cyllometra gracilis, Eumetra aphrodite. Station 50. Badjo Bay, western coast of Flores. Down to 40 Metres. Mud, sand or shells, according to locality. Capillaster multiradiata, Comatula pectiuata, Comantheria briareus, Comanthus samoana, Comanthus annulata, Petasomelra clarae, Compsometra longicirra, Compsometra parviflora. Station 51. Madura Bay, and other localities in the southern part of Molo Strait. 69 — 91 Metres. Fine grey sand ; or coarse sand with shells and stones. Mariametra tubereulata. Station 52. Off the southwestern coast of Sumba (9°3'.4S., II90 s6'7 E.). 959 Metres. Globigerina ooze. Thaumatometra thysbe. STATION 58. Anchorage off Seba, Savu. Down to 27 Metres. Sand. Comanthus parvicirra. STATION 59. Western entrance to Samau Strait (io°22'.7S., 123° 16'. 5 E.). 390 Metres. Coarse coral sand with small stones. Metacnnus varians. STATION 60. Haingsisi, Samau Island, Timor. Lithothamnion in 3 Metres and less; reef. Capillaster mul/iradia/a. Comatula purpurea, Comantheria briareus, Comanthus parvicirra, Lamprometra protecius. - / - Lamakera, Solor Island. Reef. Comatula purpt West of l.m.ih Djampeah south off Saleyei very near 7 o S., 120 i .- I .). From upward. 1' y mud, changing during the haul into coral bottom. Comasier distincta, 'ompsometra parviflo riON 74. Off southwestern Celebes (5°3'.S S., ii9°o 1 1- 1 Metn ;. Globigerina ooze (obviously thin layer). Penta inus japonicus. -. Borneo Bank (3°27 S., 11; . < I . . 59 Metn I in< ma- '::ilS. STATION 78. Lumu-Lumu Shoal, Borneo Bank. 34 Metres. < oral and coral sand. Comanthus parvi- ra, Lamprometra protectus. rneo Bank 2 43 >.. 117 44 I... 41 — 54 Metres. Fine coral sand. Capillaster sentosa, - ,-. Borneo Bank. 5 miles NNE. from Stat. 79 2°3S'.5S., ii7°4ó'E.). 54 Metres. Fine ind. Decametra minima, Toxometra pauper a. STATION ;■;■. Pulu Kabala-dua, Borneo Bank. 22 Metres. Coral sand. Comatula pectinata, Comanthus ra, Lamprometra protectus. STATION 80. Borneo Bank (2 25' S., 117 (.3' E.). 50 — 40 Metres. Fine coral sand. Colobometra discolor. . 1 1' >n 81. Pulu Sebangkatan, Borneo Bank. 34 Metres. Coral and Lithothamnion. Comanthus parvi- :, Stephanometra spinipinna, Lamprometra protectus. STATION 85. West of northern Celebes (o°36'.5S., 1 19° 20/.5 E.). 724 Metres. Fine grey mud. Th 1 :r,i hirsuta, Fariometra dione, . Itelecrinus sulcatus. . Off northwestern ('elebes (o°34'.6X.. [19 8'.S E.). [301 Metres. Fine grey mud; the trawl brouglit up chiefly yellow mud. Monachocrinus minimus, Bythocrinus nodi/ Sta i. Pulu Kaniungan ketjil. 11 Metres. ('oral. Comatella stelligera, Comatella maculata, master novaeguinea, Comanthus annulata, Stephanometra spinipinna, Stephanometra monacantha, Lampro- ■ '■■ ■ nis. iN 90. North of Island Kaniungan, eastern coast of Borneo (i° 1 7'. 5 X., Il8°53 E.). 2S1 Mei ind and stones. Capillaster multiradiata. . Pulu Sanguisiapo. I.iwi Tawi Islands, Sulu Archipelago. 12 Metres. Lithothamnion 11; sand and coral. Capillaster multiradiata. 11 Tawi Islands 5 1 1.2 X., 1 uf ^5.4 F.). 450 Metres. Bottom apparently sand and ie. Pectinomelra magnifica, Democrinus weberi. Si ■■. .;. Northwest of the Tawi l.iwi Islands (5°43o X.. [19 40' F.. 522 Metres. Stony bottom. missta parvula, Cosmiometra philippinensis, Pentametrocrinus diomedcae, Metacrinus serratus, Metacrinus nis. . Southeastern side of the Pearl Bank, Sulu (Joló) Archipelago. 15 Metres. Lithotham- :i bottom. Comatella stelligera, Comatella maculata, Comatula pectinata, Comantheria briareus, Comanthus • ra, Himerometra bartschi, Stephanometra monacantha, Lamprometra protectus, Toxometra paupera. Station 97. North of the Tawi tnds iC.1s.7N.. 119 |9'.6E.). 5Ö4Metres. Coarse coral sand. Metacrinus varians, Metacrinus suluensis. off North Ubian. 6 7'. 5 N., 120 53 Metres. Lithothamnion bottom. 1, Comatella stelligera, Capillaster multiradiata, Comatula purpurea, Comatula pectinata, tan iycnemis, Co mant kina schlegelii, Comanthus parvicirra, Heterometra affuns, Heterometra Imphimetra a ■■. Stephanometra echinus, Stephanometra oxyacantha, Stephanometra spicata, ■metra protectus, Decametra mylitfa, Compsometra / metra paupera. Doromeira parvicirra. Comanthus parvicirra, juv. 273 Station 105. Sulu (Joló) Archipelago (6°8'N., i2i°i9'E.). 275 Metres. Coral bottom. Palaeocoma- tella difficilis, Comissia parvula, Parametra granulata, Compsometra parvijlora, Democrinus weberi. Station 115. Eastern side of Pajunga Island, Kwandang Bay, Celebes. Shore. Lampr ometra protectus. Station 117. Entrance to Kwandang Bay, Celebes (i°o'.s N., I22°56'E.). 80 Metres. Sand and coral. Decametra minima, Pterometra venusta. STATION 119. East of northeastern Celebes (i°33'.5N., i24°4i'E.). 1901 Metres. Stony bottom. Fariometra scatifera. STATION 122. East of northeastern Celebes (i°58'.5N., i25°o'.5 E.). 1264 — 1 165 Metres. Aglaometra valida, Poecilomctra acoela, Strotometra ornatissima, Thaumatocrinus naresi, Hypalocrinus naresianus. Station 124. Northeast of the northeastern point of Celebes (20 27' N., i25°35'E.). 1327 Metres. Bottom, rock. Poccilometra acoela. Station 125. Anchorage off Savvan, Siau Island. 27 Metres. Stone, and some Lithothamnion. Comantheria briarcus, Lamprometra protectus, Compsometra parvijlora. STATION 129. Anchorage off Kawio and Kamboling Islands, Karkaralong Group. 23 — 31 Metres. Sand. Comissia littoralis. Station 131. Anchorage off Beo, Karakelang Islands. 13 Metres. Comanthus parvicirra. Same Locality. Reef. Comanthus parvicirra. STATION 133. Anchorage off Lirung, Salibabu Island. Down to 36 Metres. Mud and hard sand. Capillaster multiradiata, Comanthus bennetti, Comanthus parvicirra. Station 139. Northwest of Batjan, Moluccas (o°n'S., 127° 25' E.). 397 Metres. Mud, stones and coral. Euantcdon moluccana. STATION 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. Coral and Lithothamnion. Capillaster multiradiata, Comatula purpurea, Comaster distincta, Comantheria briareus, Comanthus parvicirra, Eudiocrinus indivisus, Dichr ometra flagellata, Decametra minima, Pterometra pulcherrima, Compsometra iris, Dorometra nana. STATION 149. Gebé Island; Fau anchorage and lagoon, on the western coast. 31 Metres. Coral. Comanthus annulata, Colobometra perspinosa. Station 150. West of Gebé Island, Moluccas (o°6'N., i2g°f.2 E.). 1089 Metres. Yellow-grey mud and sand ; stones. Tonrometra brevipes. STATION 153. Northwest of Waigeu Island, northwest of Papua (o° 3'.8 N., 1300 24'. 3 E.). 141 Metres. Fine and coarse sand, with dead shells. Comaster distincta. STATION 161. West of Salawatti Island, west of Papua (i° 10'. 5 S., 1300 9' E.). 798 Metres. Muddy sand. Aglaometra sulcata. Station 162. Between Loslos and Broken Islands, western coast of Salawatti. 18 Metres. Coarse and fine sand, with clay and shells. Capillaster multiradiata, Comatula pectinata, Comanthus samoaua, Comanthus parvicirra, Zygometra comata. Station 164. South of Salawatti (i°42'.s S., I30°47'.5 E.). 32 Metres. Sand, small stones and shells. Comatula pectinata, Comantlüna schlegelü, Amphimetra jacquinoti, Lamprometra protectus, Oligometra serri- pinna, Tropiometra a/ra. Station 166. West of Papua (2°28'.5-S., i3i°3'.3E.). 118 Metres. Hard coarse sand. Capillaster tenuicirra, Daidalometra arachnoides, Monachometra fragilis. STATION 167. West of Papua (2°35'.5 S., I3i°26'.2 E.). 95 Metres. Character of bottom not given. Eudiocrinus junceus, Homalometra dcuticulata, Compsometra longicirra, Dorometra clymene. Station 170. West of Papua (30 37'. 7 S., I3i°26'.4 E.). 924 Metres. Fine grey mud. Psathyrometra mira. SIBOGA-EXPEDITIE XLII*. 35 274 Siviii'N 172. Anch t>d ( ram] tut. 18 Metres. Coral and Lithothamnion bottom. Station ij im, Moluccas },02f.oS., i3i°o'.sE.). 56; Metres. Fine yellow- mud. . /'. . 1 inus weberi. STATION 174 Waru l'..i\. northern coast oi < eram. 18 Metres. Mud. Lamprometra protectus. Station 17 I rn M 1 -ooi (20 24.5 S., i I [633 — 1300 Metres. Dead coral and red with mai ■ Atopocrinus sibogae, Atelecrinus anomalus. STATION h of Ceram (2 4o'S.,i28 37'.5 E.). 835 Metres. Blue mud. Psathyr ometra inusitata. Kawa Bay, western coast of Ceram. 36 Metres. Stony bottom. Zygometra comata. 1. Amboina. Comaster novaeguineae, Lamprometra protectus, Petasometra clarae. Station Sanana Bay, eastern coast of Sula Besi. 22 Metres. Mud. Lamprometra protectus. Vnchorage off the southern point of Kabaëna Island. 22 Metres. Coarsesand. Coman- \ilata, H 'ra magnipinna, Lamprometra protectus. ;i. Southeast of Sindjai, Celebes (5°4o'.7S., i20°4S'.5 E.). 1158 Metres. Coarse grey mud, the supeiiici.il layer more Huid and brown. Stiremetra perplexa, Psatkyrometra anomala, Nepiometr, . Bythocrinus nodip -. 213. Saleyer, Reef. Comatella maculata, Comanthus annulata, Dichrometra flagellata, Deca- nna. • ). Anchorage off 1'asir Pandjang, western coast of Binongka. 278 Metres. Coral sand. . lis. Same Locality. Reef. Contant/una schlegelii. Mid-channel between the Lucipara and Schildpad Islands (io°26'.7S., 1270 36'.5 E.). . Hard bottom; nothing hut small stones came up in the dredge. Crotalometra marginalis. 1. Nalahia Bay. Nusa Laut Island. 46 Metres. Stony bottom. Comanthus parvicirra. nda. 9 — 36 Metres. Capillaster sentosa, Capillaster mulHradiata, Comaster multi- t 'omantheria briareus, Comanthus bennetti, Comanthus parvü irra, Colobomctra , tra parviflora. Same locality. Reef. Comanthus parvicirra. Banda (4°24'.3S., l2Q°4c/.3 E.). 1570 Metres. Dark sand with small stones. Bythocrinus ■ us poculum. ,S. Anchorage off Rumah Lusi, northern point of Tiur Island. Down to 54 Metres. Character of bottom nol ed. Lamprometra protectus. mON 250. Anchi iff Kilsuin, western coast of Kur Island. 20 — 45 Metres. Coral and Litho- thamnion. Capillaster mulHradiata, Comatula purpur ea, Stephanometra monacantha, Dichrometra flagellata, metra nana. -\. N'orth of the 1' .Is (5°28'.4S., i32°o'.2 E.). 204 Mctus. I l.ud coral sand: the trawl brought up pieces of grey clay and manga dules, the interior of which consisted ol dry clay. Oceanometra magna, Nanometra clymene, Nepiometra alcyon, Metacrinus acutus, Metacrinus cingulatus, Metacrinus nobilis, Metacrinus superbus. 53. Kei Islands (5°48'.2S., 132 \ \ Metres. Grey clay, hard and crumbly. Cosmio- Ohilippim inometra clymene, Metacrinus acutus, Metacrinus varians, Metacrinus nobilis. (.. Kei Islands (54 Metres. Fine grey mud. Cosmio metra philippi- ■metra heliu wmetra gorgonia, Strotomctra parvipinna, Nanometra clymene, Metacrinus . '/, tacrinus nobilis, Metacrinus SUperl 275 Station 257. Du-roa Strait, Kei Islands. Down to 52 Metres. Coral. Comaster pulcher, Comantheria briareus, Eudiocrinus indivisus. Station 25S. Tual Anchorage, Kei Islands. 22 Metres. Lithothamnion, sand and coral. Oligometra serripinna. Station 259. Kei Islands (50 20/.2 S., I32°52'.5 E.). 487 Metres. Coral sand and dead coral. Perisso- metra crassa. STATION 260. 2.3 miles N. 630 W. from the northern point of Nuhu Jaan, Kei Islands (5°36'.5S., 1320 55'. 2 E.), go Metres. Sand, coral and shells. Comissia lütkeni, Comissia liispida, Comaster distincta, Eudiocrinus indivisus, Decametra parva, Decametra minima, Cotylometra gracilicirra, Neometra diana, Asterometra mirijica, Asterometra longicirra. Station 266. Kei Islands (50 56'. 5 S., 1^2° ^'-7 E.). 595 Metres. Grey mud with coral and stones. Comissia gracilipes, Strotometra priamus. STATION 267. Kei Islands (50 54' S., 132° S6'.7 E.). 984 Metres. Grey mud with a brown upper layer. Comissia gracilipes, Comatulides australis. STATION 273. Anchorage off Pulu Jedan, eastern coast of the Aru Islands (Pearl Banks). 13 Metres. Sand and shells. Capillaster multiradiata, Comatula rotalaria, Comatula etheridgei, Coma/u/a purpurea, Comatula pectinata, Comantheria rotula, Comanthus annulata, Comanthus parvicirra, Zygometra microdiscus, Zygometra punctata, Heterometra crenulata, Amphimetra discoidea, Oligometrides adeonae, Oligometra carpenteri. Station 274. Off the northeastern part of the Aru Islands (5° 28'. 2 S., 1340 53'-9 E.). 57 Metres. Sand and shells; stones. Capillaster multiradiata, Comatula purpurea, Comaster parvus, Heterometra er e uit - lata, Oligometra carpenteri. STATION 279. Rumah Kuda Bay, Roma Island. 36 Metres. Mud and Sand. Lamprometra protectus. STATION 282. Anchorage between Nusa Besi and the northeastern point of Timor (8° 25'. 2 S., 1270 i8'.4 E.). 27 — 54 Metres. Sand, coral and Lithothamnion. Comatella nigra, Capillaster multiradiata, Comatula purpurea, Comatula pectinata, Comaster fruticosus, Comaster delicata, Comantheria briareus, Coman- theria rotula, Comanthus parvicirra. STATION 284. Timor (8°43'.iS., 1270 16'. 7 E.). 828 Metres. Grey mud. Democrinus weberi. STATION 285. Southern coast of Timor (8° 3g'.i S., I27°4'.4E.). 34 Metres. On the dividing line between mud and coral. Capillaster multiradiata, Comatula purpurea, Comatula pectinata. Station 286. Timor (8° 50'. 2 S., i27°2'.2E.). 883 Metres. Mud, evidently a thin layer. Thalasso- metra liirsuta. STATION 289. Timor (90 9'.3 S., 1260 24'. 5 E.). 112 Metres. Mud, sand and shells. Comaster distincta, Eudiocrinus venustulus, Compsometra parvi flora, Democrinus weberi. Station 294. Timor (io° 12'. 2 S., 1240 27/-3 È.). 73 Metres. Soft mud with very fine sand. Capil- laster multiradiata, Comissia parvula, Comatula pectinata, Comaster parvus, Comaster distincta, Comanthus tarvicirra, Catoptometra opliiura, Eudiocrinus venustulus, Eudiocrinus ornatus, Mariametra tenuipes, Neo- metra diana, Asterometra mirijica, Daidalometra arachnoides, Perissometra gorgonia, Eumetra aphrodite. Station 295. Timor (io°35'.6S., 1240 n'.pE.). 2050 Metres. Fine grey mud 3 cm. thick, the upper layer more fluid, brown with black stripes. Democrinus weberi. STATION 296. Anchorage off Noimini, South coast of Timor. Coral Reef. Capillaster multiradiata. Station 297. Timor (io°39'S., I23°40' E.). 520 Metres. Soft grey mud with a brown upper layer. Comatulides australis, Crossometra investigatoris, Perissometra robusta, Perissometra timorensis, Chondro- metra rugosa, Chondrometra robusta, Strotometra parvipinna, Strotometra priamus, Democrinus weberi, Eudoxocrinus sibogae, Metacrinus cingulatus, Metacrinus nobilis var. timorensis. Station 299. Boeka (or Cyrus) Bay, southern coast of Rotti Island (io° 52.4 S., 1230 i'.i E.). 34 Metres. Mud, coral and Lithothamnion. Capillaster scutosa, Capillaster multiradiata, Comatula purpurea, Comatula pectinata, Comantheria briareus, Comanthus bennetti, Comanthus samoaua. Stati Pcpela Bay, castern coast of Rotti Island (10 38 S., 1 ^3 25'.2 E.). 22 Metres. Mud, purpurea, Step hanome tra indica. N u Rotti [sland (10 ij .9 S., i:?1' .'S7K.1. 216 Metres. Sand and coral sand. >.'<■;• minimus, Parametra compressa. ■. Samau Island. Down to 36 Metres. Litho thamnion. Comanthina schlegelii. Mid-channel in Solor Strait, off Kampong Menanga. 113 Metrcs. Stuny. Comissia •sima, Comaster distincta, Eudiocrinus indivisus, Cyllometra mama, Oligometrides ylometra ra, Neometra sibogc metra alecto. 10. Eastern coast of Sumbawa i8°3o'S., H9°7'.5E.). 73 Metrcs. Sand, with a few pi of dead coral. Comantkus parvicirra, Eudiocrinus pinnatus, Eudiocrinus serripinna, Pontiometra andersom, Station 314. Paternostei [slands (70 36 S., 1170 3o'.8 E.). 694 Metres. Fine sandy mud. Psath . Pentametrocrinus varians. LTION 315. Anchorage east of Sailus Besar, Paternoster Islands. Down to 36 Metrcs. Coral and Lithothamnion. Cotnanthus parvicirra, Decametra paria. STATION 316. Paternoster Islands (7°i9'.4S., 1 160 49'. 5 E.). 53S Metres. Fine dark br'own sandy mud ter multibrachiata, Psathyrometra inusitata. noN 318. Between Borneo and castern Java (6° 36'. 5 S., 1 140 55.5 E.). 88 Metres. Fine yellowish grey mud. Capillaster gracilicirra, Capillaster tenuicirra, Comatula purpurea, Comaster sibogae, Hetero- metra propinqua, Dichrometra tenuicirra. riON 319. Between Borneo and castern Java (6° ió'.s S., U4°37'E.). 82 Metrcs. Fine yellowish grey mud. Capillaster tenuicirra. ii.'N 320. Between Borneo and eastern Java (6° 5 'S., H4°7'E.). 82 Metres. Fine grey mud. Capillaster gracilicirra . Capillaster tenuicirra , Comatula tenuicirra , Ilelerometra propinqua, Oxy metra tenuicirra, Dichrometra tenuicirra. \ 322. One and one half miles south of Tandjong Lajar, southern coast of Bawean Island. Metres. Coral. Comatella stelligera, Cotnanthus annulata, Zygotnetra cotnata. Bay, Java. Comanthina schlegelii. Enkhuizi n Island (near Batavia). Comatella nigra, Stephanometra oxyacantha. Maumeri, Fl I Reef. Comaster novaeguinea, Comanthus parvicirra. Toxotnetra paupera. THE INORGANIC CONSTITUENTS OF THE SKELETONS OF ZYGOMETRA MICRODISCUS AND OF CHONDROMETRA RUGOSA. At my request Professor Frank W. Clarke of the United States Zoological Survey made detailed analyses of fragments of the arms of a specimen of Zygometra microdiscus (Bell) from the Aru Islands in 13 metres of water (Stat. 273), and also of a specimen of Chondr ometra rugosa (A. H. Clark) from the southern coast of Timor in 520 metres (Stat. 297). It is a very curious fact, first discovered by Professor Clarke in making a series of analyses for me, that in the crinoid skeleton the proportion of magnesium carbonate (MgCOg), which is always found in conjunction with the calcium carbonate (CaCA8), varies according to the temperature of the habitat, quite regardless of the systematic position of the animals. Thus in the skeletons of the crinoids living in water having a temperature of from — i.8° to + i-5° C. the percentage of magnesium carbonate is from 7.28 to 8.23, while in the littoral crinoids of the Philippine Islands the percentage is from 12.20 to 12.69. In water of inter- mecliate temperatures intermediate percentages are found. This holds good not only for the crinoids, but for all other echinoderms as well, and indeed apparently for all other marine animals which have a strictly internal calcareous skeleton - alcyonarians, most foraminifera, etc. The actual analyses of the skeletons of Zygometra microdiscus and of Chondrometra rugosa, which were made by Mr. W . C. Wheeler under the direction of Professor Clarke, gave the follpwing results : Zygometra microdiscus Chondrometra rugosa SiO., R203 ') MgO CaO PA Loss on ignition CO., needed . . 0.04 0.48 4.92 37-19 0.17 55-OS 3447 0.05 0.23 3-99 42.72 Tracé 51.69 37-95 1) The symbol "R.2O3" represents the sum of ferric oxide and alumina, and "Loss on ignition" covevs carbon dioxide, water and organic matter. The C0.2 calculated to satisfy the bases is given. Eliminating the highly variable organic matter and recalculating to too > . the anah i ime the following form : rodiscus Chondromttra / . SiO 0.05 0.62 0 ii-n .... ts 9.80 < ., 1' M .... 1 race [O >.00 [ 00.00 ■keleton of Zygometra microdiscus contains the highest percentage of MgCO, of any <>f which analyses have been made. The percentage of MgC08 in the ikeleton of Chondro- metra rugosa is what would be assumed from the temperature of its habitat. INDEX. The following index includes all the scientific names mentioned in the preceding pages, excepting in the introduction. Synonyms are given in italics. This index, in combination vvith the synonymy given under each species, furnishes a key to everything which has been published dealing with the comatulids of the East Indian region. The few East Indian species of which the synonymy is not given may be readily traced to the original citations through reference to "The Crinoids of the Indian Ocean". abyssicola, Antedon 254. Bathymetra 254 (in key), 254. abyssorum, Antedon 256. Promachocrinus 259, footnote. Thaumatometra 255 (in key), 256. acanthaster, Neometra 132 (in key). acerba, Asterometra 141 (in key). acoela, Antedon 190. Poecilometra 190 (in key), 190, 273. Actinomclra affinis 30. albonotata 26, footnote. annotea 55. annulata 53. armata 5 5 . aruensis 25. bennetti 50. borneensis 1 5 . bracliymera 50. briareus 44. coppingeri 1 5 . cristata 4, footnote. cumingi 55. cumingii 55. difficilis 7, 8, 9. dissimihs 46. distincta 41. divaricata 43, footnote, 44. duplex 46. elongata 55, 56. fimbriata 1 5 . fusca 7. gracilis 1 5 . 97- 39- ., Xcünometra grandicalyx 5 1 . guttata 5 5 . imperialis 26, footnote. intermedia 26, footnote. intricata 53, 55. jukesi 25. jukesii 25. litoralis 53. Ut tor ali s 53. macrobrachius 10. maculata 6, 7, in e v er i 53. multibrachiata multifida 38, 46. multiradiata 7, 11, 15, 50. nut tab il is 55. nigra 5. nobilis 46, 47. notata 5. novae-gunieae 38, 39. parvicirra 30, 41, 44, 46, 52, 53, 55, 56. parvicurva 56. paucicirra 25. pectinata 30. peronii 50. polymorpha 55. pit Ie h el la 8, 9. quadrata 55, 56. regalis 38, 39, 46, 47. robusta 26, footnote. robustipinna 51. rotalaria 55. >8o ra ii. . 57. ■ lotnote. tena aster 54. typ 17- .-./- 'r,4. 165 na, Psathyrometra 22; (in key), 226. omatella 9. alboflava, Antedon 160. Ii letra 160. albonotata, Actinometra 21 , footnote. albopurpurea, Cyllometra 11; (in key), 11;, 1 alcyon, Nepiometra 251 in key), 251, 274. I haumatometra 25 1 (in ki ; . Xlecto bennetti 50. dentata elongata 104, footnote, 106. flagellata 106. novae-guineae s~. parvicirra 54. purpurea 27. sar su 24'). tessellata 90. 91. timorensis 54. alecto, Calometra 137. Neometra 133 (in key), 137, 276. aliena, Craspedometra yy, footnote, 80, Si. alternans, ( omantheria 43 (in key). Comanthus 44. alternata, Ante-Jon 252, 253, Thaumatometra 255 (in key). 256. amboinae, Craspedometra yS, footnote. Heterometra 78 (in key), y8, footnote. amboinensis, Antedon 100, footnote, 100. Amphimetra 73 (in key), 82. Amphimetra anceps 81. crenulata 80. den tic 11 la ta 9 1 . discoidea 83 (in key;, 85. 87, 88, 89, 90, 272, 275. ensifer 83 (in key), 88. ensiformis 88. formosa 87. jacquinoti 83 (in key), 84. 85. 271, 273. laevipinna 83 (in key . 88. 90. laevissima 84, üy. milberti 83, 84, 85, 86, 87, 88, 89, 90. mollen 82 (in key), 83, 84, 86, 90. mortenseni yj, footnote. papuensis 83 (in key), 87, 89. parilis 82 (in key), 84. pinniformis 83 (in key), 89. propinqua 80. schlegelii ss, ; sinensis 90- spectabilis 82 (in key), 83. tessellata 90. variipinna yy, footnote, So. Analcidometra 1 1 1 (in ke) . anceps, Amphimetra Si. Antedon 76, footnote, 81'. ( raspcdometra 80, 8 1 . Himerometra 79, ^y . 28l andersoni, Antedon 98. Pontiometra 98, 276. andromeda, Zygometra 59 (in key). Andrometra 198 (in key), 210. Andrometra indica 210 (in key), 210. psyche 210 (in key), 210. angusticalyx, Antedon 178, 187. Pachylometra 17S. Perissometra 176 (in key), 178. angustiradia, Adelometra 233 (in key), 233. Ante don 233. anisa, Oligometra 126. annandalei, Crotalometra 153. Oceanometra 151 (in key), 153, 153. Tlialassometra 153. annotea, Actinometra 55. annulata, Actinometra 53. Comanthus 50 (in key), 271, 272, 273, 274, __ 275, 276. Comanthus (Vania) 53. annulatum, Comanthus 53. annulatum, xanthum, Comanthus 53. anomala, Psathyrometra 225 (in key), 230, 274. anomalus, Atelecrinus 266 (in key), 269, 270, 274. antarctica, Psathyrometra 225 (in key), 230. Antedon 197 (in key), 203. Antedon abyssicola 254. abyssorum 256. acoela 1 90. aattiradia 16 1. adeonae 126. adrestine 212. adriatica 203 (in key). aequipinna 100, footnote, 100. affinis 82. af ra 132. agassizii 1 70. alboflava 1 60. alter nata 252, 253, 256. amboinensis 100, footnote, 100. anceps j6, footnote, 81. andersom 98. angusticalyx 178, 187. angustiradia 233. articulata 103. asperrima 243. aster 155. balanoides 233. bassett-smithi 6. bidens 126. bidentata jj, footnote, 79. bifida 203 (in key). bigradata 226. bispinosa 170. bowersi 239. S1BOG V-EXrEDlTIE XI.Il/'. Antedon brevicirra 41. brevicuneata 100, footnote, 101. brevipinna 187. brevipinna var. coronata 187. decora 187. diadema 187. elegans 187. gracilis 187. granulosa 187. laevis 187. ornata 187. pulchra 187. spinosa 187. tuberosa 187. breviradia 161. b nar e us 44. briseis 216. brockii 76, footnote. carinata 130. car penter i 1 30. ciiiata 256. clarae 113. clemens 76, footnote, 81. c/zö 244. colum.nq.ris 231. comata 61. compressa 138, 160. conifera 154. conjungens 100, footnote, too. crassipinna 74. crenulata 79. cubensis 220, 247. decipiens jj, footnote, 79. defecta 236. denticulata 91. diadema 157. diomedeae 234. distincta 185. dübenii 204 (in key). tlubia jj, footnote, 79. duplex 154, 160. echt nata 171. elegans 61. elongata 106. erythrizon 226. esckrickti 240. eschrichti var. magellanica 242. eversa 161. exigua 2411. fimbriatus I 5 . flagellata 1 06. 7?rt7'rt I49. flavomacnlata 93, footnote, 96. flexilis 182. fluctuans 59, footnote. 36 282 Anl 221. urniana 232. !43" hupferi 203 (in l imparipinna 100, footnote, 100, 101. inaequalis 1 84. incerta \ incommoda 2 indica 1 00. inexpectata 243. infortnis 1 2 insignis 123, footnote, 124. irregularis 30, 77, footnote, 79. mm 24S. jacquinoti klunsingeri 100, footnote. laevicirra 100, footn<>t< laevipinna ^. laevis 2^,2. laevissima 84, 87. laodice 243. /«ta 1S2. latipinna 1 70. lepida 100, footnote, 100. longicirra 141, 142. longipinna 253. lovéni 123, footnote, 124, 209, 210. lusitanica 171. magellanica 242. magnicirra 1 50. magnicirrus 1 50. magnicrinus 1 50. tnanca 115. marginata 94, footnote. 95. mar nu- 243. ■ 12, 203 (in 1. uur /tii si 5 5 . microdiscus 60. milberti 84, 85, 87, 89, 130. minor 2 minnta 2 1 2. moluccana 201. monacantha 96, 97. iccana 204 (in key). multiradiata 59, footnote, 60. multispina 171. //r?/w 216. .\nt< don ...' loo, footnote, 1 (•/<7// 100, footnote, hm. omissa 171. orientalis 239. <// 100, footnote, 100, 101. brevipes, Tonrometra 258 (in key), 258. 273. Trichometra 258. brevipinna, Antedon [87. brevipinna var. coronata, Antedon [87. decora, Antedon [87. diadema, Antedon 187. elegans, Antedon [87. gracilis, Antedon 187. granulosa, Antedon [87. laevis, Antedon 187. ornata, Antedon 187. pulchra, Antedon 187. spinosa, Antedon [87. tuberosa, Antedon 187. matula 1 - iradia, Antidon 161. Stiremetra 161 (in key), 161. briareus, Actinometra 44. Antedon 44. Comantheria 43 fin key), 44, 45, 271, 272, 273. 274. 275. nanthus 44. Comanthus (Comanthus) 44. briseis, Antedon 216. Dorometra 2 1 5 (in ke)-), 216. brockii, Antedon 76, Footnote. Bythocrinus nodipes 272, 274. caledoniae, Oligometra 130 (in key), 130. callipccha, Lampromelra 100, footnote, 10 1. callipeplum, Co ma ut luis 43, footnote, 44. Calometra i Calometra alecto 137. diana 1 33. discoidea 133. magnifica 138 (in key. 138. Calyptometra 174 (in key), 189. Calyptometra lateralis 189, 195. Capillaster 2 (in key), 9, 18. llaster clarki 10 (in kej . 15, 18. coccodistoma ro (in kej ilicirra 10 (in key) 11, 276. macrobrachius 9 (in key), 10, 272. ( apillaster mariae io (in key). multiradiata io (in key), 13, 14, is. 271, 272, 74, 27;. sentosa 10 (in key), 11, 272, 274, 275. tenuicirra 10 (in key), 11, 12, 273, Capillasterinae 1 (in key), 2 (in key), 2. carduum, Pectini imetra [38 in 'l • ■ carinata, Antedon 130. ( >■ matula 88. Tropiometra 1 3 1 (in key). carinifera, Stiremetra 161 (in key), 161. carpenteri, Antedon 130. Bathymetra 254 (in key), 254. Oligometra 129 (in key), 130, 275. Catoptometra 63. Catoptometra hartlaubi 63 (in key). magnifica 63 (in key), 64. ophiura 63 (in key), 64, 271, 275. rubroflava 63 (in key). 64. celtica, Leptometra 80, 231 (in key). Cenolia 4S (in key). Cenometra 34, 111 (in key). chadwicki, Comissia 19 (in key). Prometra 125 (in key). chamberlaini, Eumetra 213 (in key), 213, 214. Charitometra 172, (in key), 191. Charitometra basicurva 191 (in key). distincta 1 76. imbricata 187. incisa 191 (in key). lata 182. lateralis 1 89. smithi 184, footnote, 185. ( "HAkl I' iMETRIDAE 171. chinensis, Oligometra 130 (in key). chinensis perlegens, Stella 14. Chlorometra 174 (in key), 190. Chlorometra garrettiana 190. robusta 1 89. Chondrometra 172 (in key), 187. Chondrometra aculeata 188 (in key), 189. robusta [88 (in key), 188, 189, 275. rugosa 187 (in key), 188, 275, 277, 278. ciliata, . Uit, :, 1 >ichrometra 105 (in key). ulatus, Metacrinus 274, 275. clarae, . Xntedon 1 1 j. Petasometra [13 (in key), 113, 271. 274. clarki, Capillaster 10 (in key), 15, 18. clemens, Antedon y6, footnote, 81. 'li". . bitedon 244. ( yclometra 244 (in key). 244. clymene, I' metra 215 (in key), 217, 273. Nanometra 237 (in key). 237, 274. coccodistoma, Capillaster io (in key). 28' Coccometra 217 (in key), 218. Coccometra guttata 218 (in key), 219. hagenii 219 (in key), 221. nigrolineata 219 (in key), 220, 247. Colobometra 68, 112 (in key), 123. Colobometra diadema 123 (in key). discolor 123 (in key), 124, 272, 276. perspinosa 123 (in key), 124, 271, 273, 274. suavis 123 (in key). vepretum 123 (in key). CuLOBOMETRIDAE 90, HO, 266. columnaris, Antcdon 231. Zenometra 231. Comactinia 24 (in key), 32. Comactiniinae 2 (in key), 24. Comantheria 34 (in key), 42. Comantheria alternans 43 (in key). briareus 43 (in key), 44, 45, 271, 272, 273, 274, 275. grandicalyx 43 (in key). imbricata 43 (in key). intermedia 43 (in key), 46. magnifica 43 (in key). polycnemis 43 (in key), 43, 272. rotula 43 (in key), 44, 275. weberi 43 (in key), 45, 46, 271. Comanthina 34 (in key), 46. Comanthina schlegelii 38, 46, 271, 272, 273, 274, 276. Comanthus 18, 34 (in key), 48, 137. Comanthus alternans 44. annulata 50 (in key), 271, 272, 273, 274, 275, 276. annulatum 53. annulatum xanthnm 53. benhami 49. bennetti 48 (in key), 51, 273, 274, 275. briareus 44. callipeplum 43, footnote, 44. crassicirra 5 1 . divaricata 44. duplex 47 ■. intricata 53. japonica 49 (in key), 51. Inteofuscum 56. nobilis 47. parvicirra 50 (in key), 56, 271, 272, 273, 274, 275, 276. parvicirrum 56. pinguis 49 (in key). polycnemis 43, 44. rotalaria 56. samoana 49 (in key), 57, 271, 273, 275. samoanum 52. se lil e gel 11 47. Comanthus solaster 49 (in key). trichoptera 49 (in key). wahlbergii 49 (in key). Comanthus (Bennettia) bennetti 51. samoana 52. (Cenolia) bennetti 50. samoana 52. (Comanthus ) bennetti 51. briareus 44. nobilis 47. parvicirra 56. rotalaria 56.. samoana 5 2 . schlegelii 47. valida 53. ( \ 'alidia) parvicirra 56. (Vania) annulata 53- parvicirra 54> 56. Comaster 18, 34 (in key), 35. Comaster belli 35' (in key), 38. coppingeri 1 5 . delicata 37 (in key), 42, 275. distincta 37 (in key), 41, 272, 273, 275, 276. fimbriata 15. fruticosus 36 (in key), 38, 39, 39, 40, 275. gracilis 35 (in key). horridits 19, footnote. minimus 35 (in key), 40, 271, 276. multibrachiata 35 (in key), 39, 40, 274, 276. multifida 35 (in key), 36 (in key). multiradiata 15. mitltiradiatus 50. novaeguineae 35 (in key), 36, footnote, 37, 38, 39, 272, 274, 276. parvus 37 (in key), 41, 274, 275. plu/ippineusis 36, footnote. pulcher 37 (in key), 40, 275. schönovi 36 (in key), 38, 40. sentosa I I. serrata 37 (in key). sibogae 36 (in key), 40, 276. taviana 37 (in key). typica 38. comaster, Thaumatometra 255 (in key), 256. COMASTERIDAE 1, 266. Comasterinae i (in key), 2 (in key), 34. comata, Antedon 61. Zygometra 59 (in key), 6l, 273, 274, 276. Comatella 3 (in key), 4. Comatella decora 4 (in key). maculata 4 (in key), 7, 272, 274. nigra 4 (in key), 5, 271, 272, 275, 276. stelligera 4 (in key), 5, 272, 276. Comatilia 4 (in key). Comatonia 4 (in key). Comatul. i ; 26, 27. Comatul ■ - :. brevipinna 1 cumittgii 30. S7. otnote, 100. dub\ etheridg fimbriata 14. 1 ;. 221. helianthus - jacquih • iO. laevissima 84. melas 100, footnote. mertensi micrastei 27 (in key), 271. w/7 i, 90. multiradiata 11, 14, 50. novae-guineae 37. orientalis 56. parvicirra 54. pectinata .7 in kej I, 271, 2; 2, 273, 275. Philippinische 5. polyactinis 100, footnote, 100. polymorpha 55. purpurea 27 in key), 32, 271, 272, 273, rotalaria 6, 25. 26, 275. . pectinifer 19 (in key). peregrina 19 (in key), 21. spinosissima 20 (in key), 21, 276. compressa, Antedon 158, 160. Parametra 15S (in key), 158, 160, 276. Tkalassometra 1 ''jo. Compsometra 197 (in key), 204, 213. Compsometra crispa 210. acilipes 206. incommoda 205 (in key), 208. iris 205 (in key), 208, 273. lacertosa 208. Iongicirra 204 (in key), 206, 271, 2j -3. lovéni 205 (in key), 208, 209- parviflora 205 (in key:, 207, 271, 272, 1, 274, 2;;. serrata 205 (in key), 209, 209- mpsometra sp. 210. compta, Heterometra j (in key). conaminis, Neometra 133 (in key). concinna, Crinometra 187. Eumorphometra 232 (in key), 232. Oligometra 129, footnote. congesta, Psathyrometra 224 (in key), 22S. 228. conifer, Atelecrinus 2<>t, [jn key), 270. conifera, Antedon 134. miometra 154 (in key), 154. conjungens, Antedon 100, footnote, 100. coppingeri, Actinotnetra 15. Comasier 13. coronata, Antedon brevipinna var. 187. Stephanometra 93, footnote, 94. Cosmiometra 148 (in key 153. Cosmiomètra aster 134 (in key), 155. conifera 154 (in key), 154. icirra 1 54 (in key. 154. delicata 153 (in key), 154. lineri 1 34 (in key . 154 287 Cosmiometra helene 155. koehleri 154 fin key), 154. philippinensis 153 (in key), 155, 272, 274. woodmasoni 154 (in key), 155. Cotylometra 111 (in key), 112 (in key), 128. Cotylometra gracilicirra 70, 128 (in key), 128, 275, 276. gracilicirra ornata 70. ornata 128 (in key). Craspedometra 72 (in key). Craspedometra aliena jy, footnote, 80. amboinae 78, footnote. anceps So, 8 1. aruensis 80. crassa, Pachy lometra 181. Perissometra 177 (in key), 181, 275. crassicirra, Comanthus 51. Cosmiometra 154 (in key). 154. Tlialassometra 1 54. crassipinna, Antedon 74. Himerometra 74. crenulata, Amphimetra 80. Antedon 79. Heterometra y1/ (in key), 7g, 81, 275. Crinometra 171 (in key), 185, 186. Crinometra concinna 187. gemmata 187. insculpta 187. margaritacea 187. • pulchra 187. crispa, Compsometra 210. cristata, Actinornetra 4, footnote. Asterometra 141 (in key), 142. Stenometra 157 (in key), 157. Crossometra 173 (in key), 174. Crossometra helius 174 (in key), 175, 274. investigatoris 174 (in key), 175, 275. septentrionalis 175 (in key), 176. Crotalometra 148 (in key), 148. Crotalometra annandalei 153. eupedata 153, 164. flava 148 (in key), 149. infelix 149. magnicirra 149 (in key), 150. marginalis 149 (in key), 150. 274. porrecta 148 (in key), 149. propinqna 165. rustica 149 (in key), 149, 150. sentifera 149 (in key), 149. sulcata 164. vera 165. cubensis, Antedon 220, 247. Atelecrinus 247, 267, footnote. Trichometra 247 (in key), 247. cumingi, Actinornetra 55. cumingii, Actinornetra 5 5 . Comatula 30. Cyclometra 240 (in key), 244. Cyclometra clio 244 (in key), 244. flavescens 244 (in key), 244. Cyllometra 11 1 (in key), 114, 116. Cyllometra albopurpurea 115 (in key), 115, 116. disciformis 1 14 (in key), 116. gracilis 114 (in key), 115, 116, 271. manca 115 (in key), 116, 116, 276. soluta 1 1 5 (in key). ■ cypris, Thaumatometra 255 (in key), 256. Daidalometra 146 (in key), 147 (in key), 157. Daidalometra arachnoides 157 (in key), 157, 273, 275. hana 157 (in key), 157. decameros, Comatulides 32, (in key), 33. Decametra 90, 112 (in key), 117. Decametra alaudae 117 (in key). arabica 1 17 (in key). brevicirra 118 (in key). informis 118 (in key), 123. laevipinna 11S (in key), 120, 274: minima 118 (in key), 121, 121, 272, 273, 275. modica 118 (in key). möbiusi 118, footnote. mollis 117 (in key), 120. mylitta 117 (in key), 118, 272. parva 118 (in key), 121, 275, 276. stilden 118 (in key). taprobanes 117 (in key). tigrina 117 (in key). decipiens, Antedon Jj, footnote, 79. decora, Antedon brevipinna var. 187. Comatella 4 (in key). defecta, Antedon 236. Hypalometra 236. deiicata, Comaster 37 (in key), 42, 275. Cosmiometra 153 (in key), 154. Heterometra 60, footnote, 62, 63. P/tanogeiua 42. Tlialassometra 1 54. Trichometra 247 (in key), 248. Trichometra 252. delicatissima, Mariametra 108 (in key). Democrinus weberi 272, 273, 274, 275. dentata, Alecto 246. denticulata, Amphimetra 91. Antedon 9 1 . Homalometra 91, 273. Xanometra 91. diadema, Antedon 157. Antedon brevipinna var. 187. 2 88 m< tra i 23 (in k> • 1 156 in kcj | ). . \2 in key . 133. natu la 87. ula milberti var. Dichrometra 98 111 key), 104. in ] articulata 103. bimaculata 104 (in k cili.it. 1 105 in 1. flagellata 104 in key), 106. 271, 273, gotoi 105 in ki heliaster 101. laevicirra 1 1 . nlta 101. palmata 101. .Y.7/M' 75. IOI. ;.'lobometra 123 (in key), 124, 272, 276. dissimilis, . Ictinomelra \ distincta, Actinometra 41. Antedon 185. Charitometra 1 1 omaster 37 (in key;, 41, 272, 273, 275, Pachylometra 1S4 (in key), 185. divaricata, Actinometra 43, footnote, 44. manthus 44. itulii 100, footnote, 100. rleini, Dichrometra 104 (in key). Dorometra 199 (in key . 214. ; 215 'm key), 217. bn - (in key), 216. 5 1, 217, 2J j. ilis 2 1 5 in key), 215. 2; \. mauritiana 215 (in key), 216. nai '15 (in key . 216, 2; ;. '. 1 I» metra parvicirra 215 (in key:, 216, dorsata, Stenometra 1 dub ia, Antedon jj, footnote, ( omatula ~~ , fi iotm diibenii, Antedon 204 (in kej . dumetum, Comissia [9, footno duplex, Actinometra 46. Antedon 154, 160. nauthus 47. Horaei >metra 160. echinata, Antedon 171. Thalassometra 166 (in key), 171. echinus, Himerometra 94. Stephanometra 93 (in key), 94, 271. 1^1. electrae, Oligometra 129 (in kej , elegans, Antedon 61 Antedon brevipinna var. 187. Zygometra 59 (in key). elongata, Actinometra 55, 56, Alecto 104, footnote, 106. Ante, ton 106. Balanometra 232 (in key), 232. Perometra 232. encrinus, Tropiometra 131 (in key). Endoxocrinus siboL;ac 275. ensifer, Amphimetra 83 (in key). 88- Himerometra 88. ensiformis, Amphimetra 88. Epimetra 112 (in key). erinacea, Oligometra 129 (in key . Oxymetra 99 (in k>\ 1. erythrizon, Antedon 226. Psathyrometra 224 (in key), 226. Erythrometra 234 (in key), 235. Erythrometra australis 235 (in key), 235- ruber 235 (in key), 236. eschrichli, . Intedon 240. eschrichti var. magellanica, . Intedon 242. etheridgei, ( omatula 275. Comatula (Validia) 25. Euantedon \u; (in key), 200. Euantedon moluccana 200 (in key), 201, 273. sinensis 200 (in key), 203. tahitiensis 199, 200 (in key), 200. Eudiocrinus 64. Eudiocrinus gracilis 65 (in kej . mulatus 65, footnote, 71. imliviMis 65 (in key), 70. 71. "~2, 273, 274. --. ' japonicus i'<\. jun ; (in kej . 65. 273. minor 65, footm ornatus '15 (in key . 70, 275. pinnatus >>4 (in key), 67, 2; 289 Eudiocrinus semperi 262. serri'pinna 65 (in key), 71, 271, 276. varia/is 262. variegatus 64 (in key), 68. venustulus 65 (in key), 68, 275. Eumetra 198 (in key), 213. Eumetra aphrodite 213 (in key), 213, 271, 275. chamberlaini 213 (in key), 213, 214. indica 210. Eumorphometra 223 (in key), 232. Eumorphometra concinna 232 (in key), 232. hirsuta 232 (in key), 232. eupedata, Aglaometra 163 (in key), 164. Crotalometra 153, 164. ever sa, Antedon 161. exigua, Antedon 246. explicata, Fariometra 249 (in key), 250. Trichometra 250. exquisita, Iridometra 212 (in key), 213. Fariometra 245 (in key), 248. Fariometra dione 249 (in key), 250, 272. explicata 249 (in key), 250. scutifera 248 (in key), 249, 273. fimbriata, Actinomctra 15. Comaster 1 5 . Comatula 14, 15. Comatula (Alecto) 14. fimbr.iatus, Antedon 15. finschii, Oxymetra 99 (in key), 99. fisheiï, Parametra 158 (in key), 158. Thalassometra 158. flagellata, Alecto 106. Antedon 1 06. Dichrometra 104 (in key), 106, 271, 273, 274. flagellifera, Mastigometra 19S (in key), 198. flava, Antedon 149. Antedon (Crotalometra) 149. Crotalometra 148 (in key), 149. flavescens, Cyclometra 244 (in key), 244. flavomaculata, Antedon 93, footnote, 96. flavopurpurea, Pectinometra 93, 137, [38 (in key). flexilis, Antedon 182. Pachylometra 182. Perissometra 178 (in key), 182. flora, Heterometra jj (in key). Florometra 240 (in key), 240, 243. Florometra asperrima 241 (in key), 243, 244. laodice 241 (in key), 243, 244. magellanica 242 (in key), 242, 243. mariae 241 (in key), 242 (in key), 243, 244. perplexa 241 (in key), 243, 244. serratissima 242 (in key), 243, 244. SinOGA-EXPEDITIE XI, II /■. Florometra tanneri 241 (in key), 243, 244. jhtc titans, Antedon 59, footnote. Zygometra 61. formosa, Amphimetra 87. fragilis, Antedon 226. Monachometra 185, 273. Pachylometra 185. Psathyrometra 223 (in key), 226. fruticosus, Comaster 36 (in key), 38, 39, 40, 275. fusca, Actinomctra 7. gardineri, Cosmiometra 154 (in key), 154. garrettiana, Antedon 190. Chlorometra [90. gemmata, Crinometra 1S7. Gephyrocrinus 264, 268. gigantea, Oceanometra 150 (in key), 151, 152, 153 Thalassometra 151. glacialis, Heliometra 227, 240. Glyptometra 173 (in key), 190. Glyptometra timorensis 182. tuberosa 190, 194. gorgonia, Neometra 132 (in key). Perissometra 177 (in key), 179, 274, 275 gotoi, Dichrometra 105 (in key). gracilicirra, Capillaster 10 (in key), 11, 276. Cotylometra 70, 1 28 (in key), 128, 275, 276 Ohgomctra 128. ornata, Cotylometra 70. gracilipes, Comissia 20 (in key), 22, 275. Compsometra 206. Himcromctra 99, footnote. gracilis, Actinomctra 15. Antedon [70. Antedon brevipinna var. 187. Comaster 35 (in key). Cyllometra 114 (in key), 115, 116, 271. Dorometra 215 (in key), 215, 274. Eudiocrinus 65 (in key). gracillima, Iridometra 215. Psathyrometra 225 (in key), 226 (in key.), 228. grandicalyx, Actinomctra 51. Comantheria 43 (in key). grandis, Liparometra 103 (in key). granulata, Parametra 158 (in key), 160, 273. granuïatus, Eudiocrinus 65, footnote, 71. granulifera, Antedon 187. granulosa, Antedon brevipinna var. 187. gravieri, Heterometra 78 (in key). guttata, Actinomctra 55. Coccometra 218 (in key), 219. gyges, Lamprometra 100 (in key). hagenii, Antedon 220, 221. 37 290 221. M. hamatu, Comat i n in \.< j . li. in. i. ..' kej . 157 li.irtl.uilr tra j (in k( i 2i i (in I. Hathrometra 245 m key), 246. 251. Hathron \ntedon 170. rhalassometra 1 68 (in key), 170. 1 >metra 1 ;;. Vtelecrinus 267 (in k< helianthoides, Petasometra 1 1 3 (in kej 7/,/ 56. Himerometra 101. heliaster, Dichrometra 101. Himerometra 100, footnotc, 101. Heliometra 240 (in key), 240. Heliometra glacialis 227, 240. rellanica 243. rhomboidea H e 1 i o in e t r i o a 239. heli- .metra 174 (in key), 175. 274. Pachy lometra 175. hepburniana, Antedon 194. Strotometra 192 (in key), 194. Heterometra 72 (in key), 75. Heterometra affinis 79 (in key), 82, 272. africana 77 (in key). amboinae 78 (in key), 78. footnote. I ater 78 (in key). bengalensis 79 (in 1 bengalensis 61, 63. compta 79 (in k crenulata 77 (in key), 79. 81, 275. delicata 60, footnotc, 62, 63. I in key). joubini 78 (in 1 madagascarensis jS (in 1 marlens, nematodon ju (in 1 philiberti 77 (in !<• producta 76 (in key), 81. propinqua 7'' (in key), 80. pulchra 78 (in 1 quinduplicava 7'» (in key . 81. 87, 272. reynaudii 79 (in key). 'iti I schlegelii jj (in ki singularis 78 (in k< variipinna 76 (in ki 1 Mthonictra 258. hibernica, Trichomelra 247, 258. Himerometra 72 111 key), 73. I linu K 'nut 1 .1 ai uta 93, fo< >tm >te, 1 1( i. anceps 79, 87. bartschi 73 (in key , 75, 272. ■ rassipinna , |. discoidea ^j. eckinus 94. ensifer 88. 19, footn helianthns 10 1. heliaster 1 00, footnote, 101. kraepelini 74, footnote. magnipinna 59, 74 lin key), 74, 274. martensi 74 (in key). milberti 83, 84, 85, 87, 89. mollen 84. monacantha 96. persica 73 (in key), 75. proleet 'us 1 0 1 . quinduplicava 81. robustipinna 74 (in key), 74. schlegelii ^. sol 73 (in kej . tessellata 9 1 . variipinna IIlVI 1 1 » ,1 i 1 RIDA] 72. hirsuta, Antedon 232. Eumorphometra 232 (in key), 232. Thalassometra 168 (in key), [69, 169, 272, Tliaumatometra 232. hispida, Comissia 19 iin key), 20, 21, 22, 23, Homalometra 72, 73 (in key), 91. Homalometra denticulata 91, 273. hondoensis, . Intedon 243. Horaeometra 145 (in key), 160. Horacometra duplex 160. horridus, Comaster 19, footnote. Comissia [9 (in key). hupferi, Antedon 203 (in key). Hybometra 198 (in key). 217. 1 [ybometra senta 217. 1 [ypalocrinus naresianus Hypalometra n key), 236. I [ypalomi tra defecta 236. Hyponome sarsü 59, footnote, 60. hystrix, . Intedon 246. ia 20 (m 1. imbricata, < 'haritorm tra 1 ^y. 1 omantheria 43 (in key . ( Uigomi tra [29 (in key . imparipinna, Antedon 100, footnote, 100, 10 1. impcrialis, Actinometra 26, footnote. -9i inaequalis, Antedon 184. Pachylometra 1S4, (in key), 185. incerta, Aglaometra 163 (in key), 165. Antedon 165. incisa, Charitometra 191 (in key). incommoda, Antedon 208. Compsometra 205 (in key), 208. indica, Andrometra 210 (in key), 210. Antedon 100. Comatula 97. E unie tra 210. Stephanometra 94 (in key), 96, 97, 276. Tropiometra 131 (in key). indivisus, Eudiocrinus 65 (in key), 70, 71, 272, 273, 275, 276. Ophiocrinus 7 1 . inexpectata, Antedon 243. infelix, Crotalometra 149. Tlialassometra 149. informis, Antedon 123. Decanietra 118 (in key), 123. insculpta, Crinometra 187. insignis, Antedon 123, footnote, 124. intermedia, Actinometra 26, footnote. Comantheria 43 (in key), 46. Oligometra 125, footnote. Prometra 125 (in key). intricata, Actinometra 53, 55. Comanthus 53. inusitata, Psathyrometra 225 (in key), 229, 231, 271, 274, 276. invenusta, Pachylometra 181. Perissometra 178 (in key), 181. investigatoris, Crossometra 174 (in key), 175, 275. Pachylometra 175. io, Nepiometra 251 (in key), 252, 274. Iridometra 198 (in key), 212. Iridometra adrestine 212 (in key), 212. aegyptica 217. exquisita 212 (in key), 213. gracilis 215. mauritiana 216. melpomene 212 (in key), 212. na na 216. parvicirra 2 1 6. psyche 210. scita 21 6. (Eumetrai aphrodite 213. iris, Compsometra 205 (in key), 208, 273. irregularis, Antedon 30, jj, footnote, 79. isis, Antedon 248. Tliaumatometra 248. TrichoTnetra 247 (in key), 248. Isometra 239. Isometrinae 196 (in key), 239. jacquinoti, Amphimetra 83 (in key), 84, 85,87, 271, 273- Antedon 85. Comatula 85, 89, 90. japonica, Comanthus 49 (in key), 51. Oligometra 130 (in key). japonicus, Eudiocrinus 261 Pentamctrocrinus 66, 261 (in key), 261, 270, 271, 272. joubini, Heterometra 78 (in key). jukesi, Actinometra 25. jukesii, Actinometra 25. junceus, Eudiocrinus 64 (in key), 65. 273. jungerseni, Thaumatocrinus 259 (in key). Kallispongia archeri 209. kerguelensis, Promachocrinus 26. klunsingeri, Antedon 100, footnote. koehleri, Cosmiometra 154 (in key), 154. Zygometra 63, footnote. komachi, Tlialassometra 155. kraepelini, Himerometra 74, footnote. lacertosa, Compsometra 208. laevicirra, Antedon 100, footnote, 100. Dichrometra 1 o 1 . laevipinna, Amphimetra 83 (in key), 88, 90. Antedon 88. Decametra 118 (in key), 120, 274. Prometra 1 20. laevis, Antedon 252. Antedon brevipinna var. 187. Nepiometra 251 (in key), 252. laevis sima, Amphimetra 84, 87. Antedon 84, 87. Comatula 84, 85, 87. Lamprometra 98 (in key), ÏOO- Lamprometra brachypecha 100, footnote, 10 1. callipecha, 100, footnote, 10 1. gyges 100 (in key). palmata 100 (in key). protectus 100 (in key), 100, 109, 272. 273, 274, 275. laodice, Antedon 243. Florometra 241 (in key), 243, 243. lata, Antedon 182. Charitometra 182. Perissometra 177 (in key), 182. lateralis, Calyptometra 189, 195. Charitometra 1 89. latipinna, Antedon 170. Tlialassometra 167 (in key), 170. lepida, Antedon 100, footnote, 100. Asterometra 140 (in key), 142. Leptometra 222 (in key), 231. Lcptomctra celti phalangium 2 ; 1 in kej . Leptonemaster 3 (in ki 1 . footm ita, Pachylometra 185. Liparometra 98 in kc) . 103. Liparometra .u ticul.it. 1 103. 271. . 104. Lissometra 147 in kej . ÏÖO- 1 160. n kt } . 21, 27 j. : i 1 . I 4 2 ■ Asterometra 141 (in key), 142, 275. mpsometra 204 in key), 206. 27] Ptilometra 142. \ntedon 2 Phrixometra 253. Prometra 125 (in key), 125. .1. Anted footnote, 124, 209, 21 mpsometra 205 in key. 208, 209. liitkeni, Comissia key), 20. 21, 275. 276. haiii, Pachylometra 175. lusitanica, Anti-don \~\. Antedon Crotalometraj 171. Thalassometra i'7 (in key). 171. .«;. Comanthus 56. macilenta, Pachylometra 1S1. Perissometra 17S (in key), 181. macrobrachius, Actinomctra 10. pillaster 9 (in key), 10. 272. macrodiscus, Tropiometra 131 (in key). MACROPHREATA [96, 230. mac Asterometra 141 (in key). maculata, Actinometra 6, 7, mitella 4 (in key), 7, 272, 274. metra 78 (in kej Florometra 242, 111 key). 242, 244. Heliometra 243. Pri imai h >crinu i j 5. lanometra 243. . 1 ; 1 111 key . 151, 274. Thalassometra 1 ; 1 . bitedon 150. nu tra 149 in key), 150. . rus, . hi/d/on 150. ritius, Antedon 150. key), 138. 63 (in key), 1 manthei 138. 272. magnipeda, Pterometra 143 (in kej . magnipinna, Himerometra 71 major, Psathyrometra 224 (in key), 226. 231, 271. manca, . tntedon 1 16. Cyllometra 115 (in key), 116. 116, 276. margaritaci a, < rinometra 1N7. margaritifera, Mariametra to8, footnote, (0 Thalassometra 169 (in key), 169.271. marginalis, t rotalometra [49 (in key), 150, 274. Thalassometra 150. mai [inata, Antedon >j4, footno Oligometra 126, 127. Stephanometra 95. Thalassometra i('>7 (in key, 170. mariae, Antedon 243. ( lapillaster 10 (in key . Florometra 241 (in kej . ! 1 2 in kej . 243, 244. Oreometra [36. Mariametra 62, 98 (in key), 107. Mariametra delicatissima 108 (in key). margaritifera 108, footnote, 108. subcarinata 108 (in key). tenuipes 108 (in key), 110, 275. tuberculata 108, (in key), 108, 271. vicaria 10S (in key), 108, 271. Mariametridae 97. martensi, Heterometra 75. Himerometra 74 (in kej . Mastigometra ujj in key), 198. Mastigometra flagellifera 198 (in key), 198. micropoda 198 (in key), 200. pacifica 198 (in key), 199. mauritiana, Dorometra 215 (in key), 216. Iridometra 216. mediterranea,. Antedon 202, 203 (in key). melpomene, Iridometra 212 (in key), 212. mertensi, Ante Jon 55. Co ma tu la 55. mer/oiii. Zygometra 59, footnote, 60. Metacrinus acutus 274. cingulatus 274, 275. nobilis 2 nobilis var. timorensis 2j~~,. serratus 2~2. suluensis 2~2. ■ "4. varians 271, 272. 274. meyeri, Actinometra 53. micr.i mafula 2j (in key), 271. >matula (( 'omatul. u 27. Microcomatula 4 (in key . microdiscus, . bitedon 60. Zygometra 5-1 (in key), 60. 275. 2;;. 278. micropoda, Mastigometra [98 (in key). 200. 293 milberti, Amphimetra 83, 84, 85, 86, 88, 89, 90. Antedon 84', 85, 87, 89, 130. Antedon ( Comatula) 89. Comatula 89, 90. Comatula (Alecto) 89. Himerometra 83, 84, 85, Sy, 89. - var. dibrachiata, Comatula 88. minckerti, Nanometra 239. minima, Decametra 1 iS(inkey), 121,121,272,273,275. Phanogenia 38. Pr ometra 121. Psathyrometra 226 (in key), 228, 271, 273, minimus, Comaster 35 (in key), 3g, 271, 276. Monachocrinus 272. minor, Antedon 239. Eudiocrinus 65, footnote, 70. minnta, Antedon 212. minutissima, Bathymetra 248. Trichometra 247 (in key), 248. mira, Psathyrometra 225 (in key), 226, 227, 271, 273. mirifica, Asterometra 141 (in key), 141, 142, 275. modica, Decametra ti8 (in key). mödiusi, Decametra 118, footnote. molleri, Amphimetra 82 (in key), 83, 84, 86, 90. Himerometra 84. mollis, Decametra 117 (in key), 120. moluccana, Antedon 201. Euantedon 200 (in key), 201, 273. monacantha, Antedon 96, 97. Himerometra 96. Stephanometra 75, 93 (in key), 94, 96, 97, 272, 274. Monachocrinus minimus 272. poculum 274. Monachometra 173 (in key), 185. Monachometra fragilis 185. 273. moroccana, Antedon 204 (in key). mortenseni, Amphimetra yy, footnote. multibrachiata, Actlnometra 39. Comaster 35 (in key), 39, 40, 274, 276. Phanogenia 39. multicolor, Neometra 133 (in key), 134, 136. multifida, Actlnometra 38, 46. Comaster 35 (in key), 36 (in key). multiradiata, Actlnometra 7, 15, 50. Antedon 59, footnote, 60. Aster las 1 4. Capillaster 10 (in key), 13, 14, 18, 271, 272, 273, 274, 275. Comaster 1 5 . Comatula 1 I, 50. Comatula (Alecto) 11, 14, 50. Zygometra 60. muUiradiatus, Comaster 50. multispina, Antcdon 171. multispina, Thalassometra 166 (in key), 171. mutabills, Actlnometra 55. mylitta, Decametra 117 (in key), 118, 272. nana, Antedon 216. Dorometra 58, 215 (in key), 216, 273, 274. Iridometra 216. Nanometra 234 (in key), 236. Nanometra bowersi 237 (in key), 239. clymene 237 (in key), 237, 274. . dentlculata 91. minckerti 239. naresi, Promachocriuus 260. Thaumatocrinus 260 (in key), 260, 273. naresianus, Hypalocrinus 273. Nemaster 2 (in key), 18. nematodon, Heterometra 76 (in key). Neocomatella 3 (in key), 9. Neocomatella alata 9. Neometra 132. Neometra acanthaster 132 (in key). alecto 133 (in key), 137, 276. conaminis 133 (in key). diana 132 (in key), 133, 275. gorgonia 132 (in key). multicolor 133 (in key), 134, 136. sibogae 132 (in key), 135, 276. spinosissima 133 (in key). Nepiometra 245 (in key), 251- Nepiometra alcyon 251 (in key), 251» 274. io 251 (in key), 252, 274. laevis 251 (in key), 252. obscura 251 (in key), 251. parvula 251 (in key), 253. nigra, Actlnometra 5. Comatella 4 (in key), 5, 271, 272, 275, 276. Comatula 5 . nigrolineata, Coccometra 219 (in key), 220, 247. nobilis, Actlnometra 46, 47. Comanthus 47. Comauthus (Comanthus) 47. Metacrinus 274. var. timorensis, Metacrinus 273. nodipes, Bythocrinus 272, 274. norvegica, Hathrometra 246. uo/'ata, Actlnometra 5. novae- guineae, Actlnometra 38, 39. Alecto IJ. novaeguineae, Comaster 35 (in key), 36, footnote, 37- 38. 39. 272, 274, 276. Comatula 37. Phanogenia 38, 39. obscura, Nepiometra 251 (in key), 251. Trichometra 251. . Icntalis, i Higomctra 129 in ke) . 131. . u 100. /': I O I . Oceanon. 150. annandalei 1 5 1 (in k< y . 1 5 j, 153. 150 in ke) . 151, 152, 1 ; j. magna 151 (in key), 151 footnote, 101. Oligometra 111 (in key), 113 (in key), 128. imetra a 1 26. anisa 1 'ttS 126. caledoniae 130 (in key), 130. carpenteri 129 in key), 130. 275. chinensis 1 30 (in ke concinna 129, footn electrae 129 (in ke) . erinacea 129 (in ke) , racilicirra [28. imbricata [29 (in ki int er media 125, footnote. japonica 1 30 (in key . marginata [26, 127. occidentalis [29 in key), 131. pinniformis 89. pulchella 129, footnote, 130. serripinna [29 (in key), 130, 236, i var. occidentalis 130. thetidis 111. footnote. Oligometrides ni (in key), 126. metrides adi 75, 276. OLIGOPHREATA 1. Xntedon 171. Thalassometra 166 (in key), 171. 'sus 71. ophii iptometra 63 (in key). 64, 271, 275. tra mariae i \ntedon 2 ma/lila ■ n, Antedon 160. Parametra 158 (in key), 160. Thalassometra 1 ornata, Antedon brevipïnna var. itylometra 128 in k tylometra gracilicirra 70. ornatissima, Strotometra [91 (in kej orn (in ke) |, 70, 275. Orthometra 244 111 key, 258. hibernica 258 mi, Proraetra 1 25 (in key , 125. icantha, Ante, Ion 94. ihanometra 94 in key), 94 Oxymetra 97 (in k( mi tra ei inai n ke) . linschii <)i| 1111 1. tenuicii ra 98 in key), 99, Pachylometra 173 (in key), 184. Pachyloraetra angusticalyx 17S. crassa 181. distincta 184 (in key . 185. flexilis 1 fragilis 185. //e/i ns 175. inai qualis 184 (in key), 184. invenusta 181. invesligatoris 17?. levi n.i [84 in key), 185. /una 175. macilenta 181. patnla 179. robusta 1 79. sclateri 184 (in key), 185. se/ene 1 79. septentrionalis 1 76. snut la 185. pacifica, Mastigometra [98 (in key), 199. Palaeocomatella 3 (in key), 7. Palaeocomatella difficilis 8. 273. palmata, Antedon \»j, 101. Comatula 'Alecto) 100. Dichrometra 101. Lamprometra 100 (in key). papuensi . Amphimetra 83 (in key), 87, 89, Parametra 146 (in key), 147141) key), 148 (in key), 158. Parametra compressa 158 (in key), 158, 160, 276. fisheri 158 (in key), 158. granulata 158 (in key), 160, 273. orion 138 (in key), 160. parilis, Amphimetra 82 (in key), 84- parva, Decametra 118 in key), 121, 2j>, 2; Prometra 121. Psathyromi tra (in key), 228. Thaumatometra 256 (in key), 257. rra, Actinometra 30, 41. 44. 46, 52, 53, . l/ccto Antedon 216. I omanthus 50 (in key), 56, 271, 272, 2; \. •76. < 'omanthus (Comanlhus Comanthus nanthus (Vania) 54- ;''- matula 54. Comatula Alecto) 54. Dorometra 215 (in key), 216. 2; Iridometra 216. parvicirrum, Comanthus 56. parvicurva, Actinometra 56. 295 parviflpra, Compsometra 205 (in key), 207, 271, 272, 273. 274. 275. parvipinna, Antedon 194. Strotometra 192 (in key), 194, 274, 275. parvula, Antedon 253. Comissia 20 (in key), 23, 272, 273, 275, 276. Nepiometra 251 (in key), 253- parvus, Comaster 37 (in key), 41, 274, 275. patuia. Antedon 179. Pachy 'lometra 179. Perissometra 176 (in keyj, 179. paucicirra, Actinometra 25. paupera, Toxometra 210, 272, 276. pectinata, Actinometra 30. As ter ia s 14, 30. Comatula 27 (in key), 271, 272, 273, 275. Comatula (Comatula) 30. pectinifer, Comissia 19 (in key). Pectinometra 138. Pectinometra carduum 13S (in key). flavopurpurea 93, 137, 138. magnifica 138 (in key), 138, 272. Pentametrocrinidae 259, 265, 266. Pentametrocrinus 227, 259 (in key), 260, 265, 270. Pentametrocrinus atlanticus 261 (in key). diomedeae 261 (in key), 261, 270, 272. japonicus 66, 261 (in key), 261, 270, 271, 272. semperi 261 (in key), 262, 274. tuberculatus 261 (in key), 270. varians 66, 260 (in key), 262, 270, 271, 276. peregrina, Comissia 19 (in key), 21. pergracilis, Thalassometra 167 (in key), 170. Perissometra 173 (in key), 176. Perissometra angusticalyx 176 (in key) 178. crassa 177 (in key), 181, 275. flexilis 178 (in key), 182. gorgonia 177 (in key), 179, 274, 275. invenusta 178 (in key), 181. lata 177 (in key), 182. macilenta 178 (in key), 181. patuia 176 (in key), 179. robusta 176, 178 (in key), 179, 181,275. selene 177 (in key), 179. timorensis 177 (in key), 182, 275. per Zegens, Stel la chmensis 14. Perometra 234 (in key), 234. Perometra afra 234 (in key), 234. diomedeae 134, 234 (in key), 234. e Ion ga ta 232. pusilla 234 (in key), 234. « Perome tri nae 196 (in key), 233, 266. peronii, Actinometra 50, 51. perplexa, Antedon 243. Florometra 241 (in key), 243, 244. Stiremetra 161 (in key), 161, 274. 7 'halassometra 161. persica, Himerometra 73 (in key), 75. perspinosa, Antedon 1 24. Colobometra 123 (in key), 124,271,273, 274. Petasometra 11 1 (in key), 112 (in key), 113. Petasometra clarae 113 (in key), 113, 271, 274. helianthoides 113 (in key). petasus, Antedon 199, 204 (in key), 2 £1. phalangium, Leptometra 231 (in key). Phanogenia delicata 42. minima 38. multibrachiata 39. novae-guineae 38, 39. lypica 35, footnote, 37, 38. philiberti, Meterometra jj (in key). philippinensis, Comaster 36, footnote. Cosmiometra 153 (in key), 155, 272, 274. Philippinische Comatula 5. Phrixometra 246 (in key), 253. Phrixometra longipinna 253- picta, Tropiometra 131 (in key). pinguis, Comanthus 49 (in key). pinnatus, Eudiocrinus 64 (in key), 67, 276. pinniformis, Amphimetra 83 (in key), 89. Antedon 89, 1 26. Oligometra 89. plana, Thaumatometra 255 (in key), 258. Trichometrd 258. poculum, Monachocrinüs 274. Poecilometra 172 (in key), 190. Poecilometra acoela 190 (in key), 190, 273. scalaris 190 (in key). polyactinis, Comatula 100, footnote, 100. polycnemis, Comantheria 43 (in key), 43, 272. Comanthus 43, 44. polymorpha, Actinometra 55. Comatula 55. polypus, Antedon 98. Pontiometra 97 (in key), g8. Pontiometra andersoni 98, 276. porrecta, Antedon 149. Antedon iCrotalometra) 149. Crotalometra 148 (in key), 149. pourtalèsi, Antedon 187. Atelecrinus 267, footnote. priamus, Strotometra 191 (in key), 194, 275. pristina, Zygometra 60. producta, Heterometra 76 (in key), 81. profundorum, Psathyrometra 226. prolixa, Antedon 246. Promachocrinus 239 in kej Promachocrinus 1 lanica 24 j. Prometra 1 1 2 in k< 125. Promctra cha li intermedia 125 (in I. inna 1 2; (in key), 125 ia I2i. • ni 125 in key . 1 2;. [21. ropin ■ [laotnetra [63 in key), 1 \. 165, 165. . Xmphimetra 80. Crotalomctra r Heterometra 76 (in key), 80, 2; /. Antedon ioo. [6, 1 00. Dichrometra 75, 101. Himerometra 101. Lamprometra 100 (in key), 100, 109, 272, 75- Psathyrometra 222 (in key), 223. 238, 203, 265. Psathyrometra alascana 223 [in key), 226. •; (in key). 230, 274. antarctica 225 (in key, 230- bigradata 224 (in key), 226. borealis 223 (in key), 226. esta 224 (in key), 228, 228. erythrizon 224 (in key), 22Ö- fra ; (in key), 226. gracillima 225 (in key), 220 (in key)» 228. inusitata 225 (in key), 229, 231,271, 274, 276. major 224 (in key, 226. 231, 271. minima 226 (in key), 228, 271. mira 225 (in key), 226,227, 27l> 273- parva 225 (in key:. 228. ■ 94 kej . 95. 272. nipini 95. 272. antha 94, footnot . 95. tenuipinna 93 (in ki tuberculata rRIDAl ie tra 15. Stiremetra 141" (in key), 160. icutiradia r6i (in key , 161. breviradia 161 (in key), 161. cariiiifera t6l (in key), 161. perplexa iói (in key . 161. 274. spinicirra i<>o (in key), 161. (rota, . \ctinometra 26, footnote. Strotometra 172 (iri key), 191. tometra hepburniana 192 (in key), 194. ima 191 111 key), ig2, 273. parvipinna 192 (in key), 194, 274, 275. priamus 191 (in key, 194, 275. studeri, Decametra 11S (in key). stylifer, Antedon 104, footnote. Stylometra 147 in key), 156. Stylometra spinifera 156. Stephanometra 94, footnote, 95. suavis, Colobometra 123 (in key). subcarinata, Mariametra 10S (in key). sublilis, Antedon 100, footnote, 101. metra 1 o 1 . sulcata. Aglaometra 163 (in key. 164. 2J3. metra 1 sulcatus, Atelecrinus 266, 267 (in key . 267. 268, 272. suluensis, Metacrinus 2-2. rbus, Metacrinus 274. tahitiensis, Euantedon 199, 200 (in key), 200. tanneri, Au te Jon 241 (in key), 243. ! 1 metra 117 (in 1. ma, C01 tinometr 1 la, Asterias . bitedon 21S. Thysanometra 218 in key), 218. '/ 100, footnote. 'Uttra 101. II. 12. 29. tenuicirra, Dichrometra 104 (in key), 105, 2; Oxymetra 98 in key), 99, 276. Selenemetra 99. Thysanometra 218 (in kej , 21 . tenuipes, \<1< l imi tra 233 (in key), 233. Mariametra 108 (in key), 110, 27;. tenuipinna, Stephanomi tra 93 (in k< teiniis, Ante Jon 2; Thaumatometra 252, 2:4 (in key , 256. Ilata, . Uecto 90, 91. Amphimetra 90. Coiitatitla 91. Himerometra 9 1 . tessellatus, . \ntedon 91. Thalassocrinus 264, 268. Thalasscmetra 14; (in key), 147 (in key), 166- Thalassometra agassizii 167 (in key, 170. annandalei 153. aster 155. attenuata 16S (in key , 171. bispinosa 166 (in key . 170. compressa 160. crassicirra 1 54. delicata 1 54. echinata 166 (in key), 171. fisher 1 [58. gigantea 151. hawaiiensis 168 (in key), 170. hirsuta 168 (in key), 169, 169, 272. -75- infelix [49. komachi 155. latipinna 167 (in key), 170. lu-itanica 167 (in key), 171. na 151. margaritifera [69 in key), 169, 271. marginalis 1 50. marginata 167 (in key), 170. multispina 166 (in key), 171. omissa [66 in key), 171. orion 1 60. pergracilis 167 (in key), 170. perplexa 161. pubescens 168 (in key), 170- quinquecostata 157. rustica 149. sentifera 149. villosa 167 (in key . 170. 1 HALASSi iME 1 RIDAE 139. Thalasso me tr i nae [40 in ki j . 145. Thaumatocrinus in key), 259. Thaumatocririus borealis 259' (in key), 260. jungerseni 259 (in ki naresi 260 (in key), 260, 273. renovatus 259 (in key). 299 Thaumatocrinus rugosus 260 (in key). Thaumatometra 246 (in key), 254. Thaumatometra abyssorum 255 (in key), 256. alcyon 251 (in key). alternata 255 (in key), 256. brevicirra 255 (in key), 257- comaster 255 (in key), 256. cypris 255 (in key), 256. Airsuia 232. isis 248. parva 256 (in key), 257. plana 255 (in key), 258. re/nota 259. septentrionalis 256 (in key), 258- tenuis 252, 254 (in key), 256. thysbe 255 (in key), 257, 271. tlietidis, Oligometra 1 1 1 , footnote. Thysanometra 217 (in key), 218. Thysanometra tenelloides 218 (in key), 218. tenuicirra 21S (in key), 21 8. Thysanometrinae 196 (in key), 217. thysbe, Thaumatometra 255 (in key), 257, 271. tigrina, Decametra 1 17 (in key). timorensis, Alecto 54. Comatula 54, 55. Glyptometra 1S2. Metacrinus nobilis var. 275. ■ Perissometra 177 (in key), 182, 275. Tonrometra 244 (in key), 258. Tonrometra brevipes 258 (in key), 258, 273. remota 258 (in key), 259. Toxometra 197 (in key), 210. Toxometra paupera 210, 272, 276. pur pur ea 210. trachy gaster, Actinometra 54, 55. Trichometra 245 (in key), 246, 251. Trichometra aspera 247. brevipes 258. cubensis 247 (in key), 247. delicata 247 (in key), 248. delicata 252. explicata 250. Iiibernica 247, 258. isis 247 (in key), 248. minutissima 247 (in key), 248. obscura 251. plana 258. vexator 246 (in key), 247. sp. 247. tnchopoda, Pterometra 143 (in key), 144. trichoptera, Comanthus 49 (in key). Triscaedecacnemos 14. triserialis, Sarametra 231. Zenometra 231. Tpi(ry.MosaxKVS(/.Cr 14. Tropiometra 126, 131. Tropiometra afra 131 (in key), 132, 273. audouini 131 (in key). carinata 131 (in key). encrinus 131 (in key). indica 131 (in key). macrodiscus 131 (in key). picta 131 (in key). Tropiümetridae 131. tuberculata, Antedon 94, footnote, 95. Mariametra 108 (in key), 108, 271. Steplianometra 95. tuberculatus, Pentametrocrinus 261 (in key), 270. tuberosa, Antedon 190. Antedon brevipinna var. 187. Glyptometra 1QO, 194. typica, Actinometra 38, 47. Coma ster 3S. Phanogenia 35, footnote, 37, 38. valida, Actinometra 53. Aglaometra 163 (in key), 164, 273. Antedon 1 64. Comanthus (Comanthus) 53. Validia 24 (in key), 25. Vania 34 (in key), 48 (in key). variabüis, Actinometra 35, footnote, 38, 55. varians, Eudiocrinus 262. Metacrinus 271, 272, 274. Pentametrocrinus 66, 260 (in key), 262, 270, 27 r, 276. variegatus, Eudiocrinus 64 (in key), 68. variipinna. Amphimelra jj, footnote, 80. Antedon jj, footnote, 79, So. Heterometra 76 (in key). Himerometra 79. ? variispina, Antedon 108. venusta, Pterometra 143 (in key), 143, 273. venustulus, Eudiocrinus 65 (in key), 68, 275. vepretum, Colobometra 123 (in key). vera, Aglaometra 163 (in key), 164, 165. 274- Crotalotnetra 165. vexator, Trichometra 246 (in key), 247. vicaria. Antedon 108. Mariametra 108 (in key), 108, 271. villosa, Antedon 170. Thalassometra 167 (in key), 170. viridis, Selenemetra 99. wahlbergii, Comanthus 49 (in key). weberi,*Comantheria 43 (in key), 45, 46, 271. Democrinus 272, 273, 274, 275. wood-masoni, Antedon 155. woodmasoni, Cosmiometra 154 (in key), 155. wyvillii, Atelecrinus 267 (in key), 268. mant hui annulatum 53. ■ metra in<> (in ke) . 231. 263, .' tra columnaris 231. ; 1. Zenometrinai 222 Zygometra 59. . and rome kej , 1 in key . 61 74, 276. Zygometra elegans 59 (in k> fluctuam koehleri ^3, footnotc. mertoni 59, footnotc, 60. microdiscus 59 (in key), 60, 275. 278. multiradiata 60. pristina 60 (in k< pnnctata 60 (in key), 6l. 275. ZYG( 'MK1 RIDAE 59, 266. CORRIGENDA. 51. In the 711' line from top „grandicalix" must bc read „grandicalyx". .1. In the loil' line from top as also in the cxplanation of textfigures 10 and il .ornatissimus" is to Jtercd in .ornatissima". EXPLANATION OF PLATES. PLATE 1. Comatella nigra. Ventral view of'a specimen with sixty-five arms from Stat. 99. Natural size. Siboga- Expeditie. XLII& — A. H. Clark, Unstalked Crinoids. E. B. Decker del. Fa. P. \V. M. Trap imp PLATE II. tatella stelliger a. Ventral view of a specimen with thirty-seven arms from Stat. 99. Natural size. Siboga-Expeditie. XI,II/\ — A. H. Clark, Unstalked Crinoids. // E. B. Decker del. Fa. P. W. M. Trap impr. * PLATE III. Capillaster multiradiata. Ventra] view of a specimen with twenty-six arms from Stat. 99. Natural size. Siboga-Expeditit. XLII/>. — A. H. Clark, Unstalked Crinoids /// E. B. Decker del. Fa. P. W. M. Trap impr. PLATE IV. The original of this plate was lost on its voyage from Washington to Holland and yvill be delivcred later. uj(L I BR A I PLATE IV. Heterometra affinis. Ventral view of a young specimen with fifteen arms from Stat. 9. Natural size. Siboga-Expeditie XLII*. — A. H. Clark. Unstalked Crinoids. IV. Doris Cochran del. Fa. P. W. M. Trap inipr. PLATE V. Homalometra denticulata. Lateral view of a specimen with eleven arms from Stat. i6j. Twice natura! ^'we. Siboga- Expeditie. XLIIZ>. — A. H. Clark, Unstalked Crinoids. V E. B. Decker del. Fa. P. W. M. Trap impr. PLATE VI. Amphimetra discoidea. Ventral view of a specimen from Stat. 99. Natural size. Siboga-Expeditie. XLII/>. — A. H. Clark, Unstalked Crinoids. VI A. II. Clark and E. B. Decker del. Fa. P. W. M. Trap impr. PLATE VII. Stepkanometra spicata. Ventral view of a specimen witli twenty arms from Stat. 99. Natural size. Siboga-Expeditie. XLII/>. — A. H. Clark, Unstalked Crinoids. VII E. B. Decker del. Fa. P. W. M. Trap impr. PLATE VIII. Lamprometra protechts. Ventral view of a specimen with twenty-three arms from Stat. 125. Natura! size. Siboga- Expeditie. XlAll>. — A. H. Clark, Unstalked Crinoids. VIII E. B. Decker del. Fa. P. W. M. Trap impr. PLAÏE IX. Pterometra pulcherrima. Ventral view of a spe< imen with twenty arms from Stat. 144. Natura! Siboga-Expeditie. Wl\b. — A. H. Clark, Unstalked Crinoids. IX E. B. Decker del. Fa. P. W. M. Trap impr. PLATE X. The original of this plate was lost on its voyage from Washington to Holland and wil] bc delivered later. PLATE XI. i. Palaeocomatella difficilis: dorsal view of the specimen from Stat. 105. . 3. '. Palaeocomatella difficilis: ventral view of the samc specimen. 3. apillaster gracilicirra: lateral view of the type .specimen from Stat. 320. 2. 4. Capillaster macrobrachius: dorsal view of the specimen from Stat. 77. ■ 2. 'laster macrobrachius: ventral view of the samc specimen. 2. Siboga Expeditie XLII b AH. Clark, Unstalked < 'rinoidó. XI. J.H. Paine phoh HEUOTYPIE, VAN LEER.AMS'r I'LATE XII. Fig. <>. Capillaster tenuicirra: dorsal view of the type specimen from Stat. 320. Fig. 7. Comissia littoralis: dorsal view of the type specimen from Stat. 129, reef. 2. Fig. S. Comissia littoralis: ventral view of the same specimen. 2. Siboga- Expeditie XLII? AJH.Clark, Urvstalked Crirwids. XII J.H. Paine phoK MEUOTYPIE, VAN LEER. AMSTERDAM - PLAÏE XIII. Comissia parvula: dorsal view ol a specimen from an unknown locality. 5. Fig. 10. Comissia gracilipes: dorsal view of one of the cotypes from Stat. 267. x 3- Fig. 11. Comissia gracilipes: dorsal view of the other cotype from Stat. 267. 3. Y'vg. \2. Comissia spinosissima: ventral view of the type specimen from Stat. 505. 3. Ii 13. Comissia spinosissima: dorsal view of the same specimen. X 3. Siboga Expedirïe XLII* AH.Clark, Urwtcdked Crirwids . XIII. J.H. Paine phoK HELIOTYPtE, .■■••■ r.RDAM. PLAÏE XIV. naster pulcher: dorsal view of the type specimen from Stat. 257. 2. ! r pulcher: ventral view of the same specimen. natula purpur ea: dorsal view of a four-rayed specimen from Stat. 273. Natural size. . . tibogae: dorsal view of tin- type specimen from Stat. 31S. Natural size. taster delicata: dorsal view of the specimen from Stat. 282. Siboga-Expedilïe XLIl(' AH.Clark, Uiwtalked Crirwids. XIV J.H. Paine phoL PLATE XV. Fig. 19. Comatula tenuicirra: dorsal view of the type specimen from Stat. ^20. 2. Fig. 20. Comatula tenuicirra : ventral view of the saine specimen. 2. Fi^j. 21. Cotnatulides aus tralis: dorsal view of the type specimen from Stat. 297. Fig. 22. Cotnatulides australis: ventral view of the same specimen. 2. Sibo#a Expeditie XLII. A. ff. Clark, Unstalked Crirwidó . XV ^r. 21 J.H. Paine phof. MEU0TYP1E, VAN LEER, AMSTERDAM PLATE XVI. master minimus: dorsal view of the specimen from Stat. 302. 2. :±. Comantheria weberi: dorsal view of the type specimen from Stat. 49*. Xatural size. 25. Contant kus bennetti: dorsal view of a young specimen (the type of Comanthus crassicirra) from Stat. 1 33. Xatural size. i Coma 11 /In- na ro/iila: dorsal view of the type specimen from Stat. 273. Xatural size. Siboga Expeditie XLII^ A.H.Clark, Unstalhed Crirwids. XVI. ry^: J.H. Paine phoh ■ PLATE XVII. 2~. Eudiocrinus venustulus : lateral view of a specimen from Stat. 294. 3. Kig. 28. Eudiocrinus venustulus: dorsal view of another specimen from Stat. 294. Eudiocrinus ornatus: lateral view of a specimen fiom Stat. 294. 2. 30. Eudiocrinus piunatits: lateral view of the type specimen from Stat. 310. 31. Eudiocrinus junceus: dorsal view of the type specimen from Stat. 167. Eudiocrinus junceus : ventral view of the same specimen. 2. Siboga Expedilïe XLH* \.H.Clark, Urvstalked Crirwids. XVII. *s J.H. Paine phoï. MEL10TVP1E. VAN LEER. AMSTERDAM- PLATE XVIIÏ. Heter ometra propinqua: lateral view of the type specimen from Stat. 318. 2. . 34. Heter ometra propinqtia: opp 1 t i > ■ iami pecimen. 2. Atnphimetra discoidea: dorsal view of a foui rayed specimen from Stat. 273. -. I Atnphimetra jacquinoti: lateral view of a specimen from the Bay of Pidjot, Lombok. Natura] size. Sibo§a ExpediHe XLÏI '.' A.H.Clark, Unetalked Crinoids . XVIII *^ w» 34 J.H. Paine phoK MEUOT ■ PLATE XIX. metra tenuicirra: lateral view of the type specimen from Stat. 320. Natura! size. Oxymetra tenuicirra: opposite side of the sanie specimen. Natura! size. Fig. 39. Dichrometra tenuicirra: dorsal view of .1 specimen from Stat. 320. 2. (o. Zygometra punctata: ventral view of a specimen from Stat. 273. 2. II. Zygometra punctata: dorsal view of another specimen from St.it. 2j 3. "»«öu '-yvum11 '"'" • -i./y.' i m i< , i ■■/t>Mff/KCff « rincia-'t. J.H. Paine phoK MtUOTYPIE, VAN LEER, AM3"I PLATE XX. ! xmetra laevipinna: lateral view of a specimen from Saleyer. ! xmetra laevipinna: lateral view of a detached arm from a specimen from Saleyer, showing the pinnult I -14. Mariametra tuberculata: dorsal view of the type specimen from Stat. ; il Metres). 2. xmetra minima: lateral view of a specimen from Stat. 117. 3. Decametra parva: lateral view of the type specimen from Stat. 515. 2. 1 4.7. Mariametra tenuipes: dorsal view of the type specimen from Stat. 294. 2. Cyllometra gracilis: dorsal view of a specimen from Stat. 49a. I : ome trides adeonae: ventral view of a young specimen (the type of 0. marginata) from Stat. 305. i wietra mylitta: lateral view of a specimen from Stat. 99. 2. "il** Ik a£ fp .- «1/ . lL/ 43 %*""£ ►i--^ §0, 42 '«^^t J.H. Paine phoK MtLlÜTVPIE, VAN LttR.AMSl PLATE XXI. metra si dorsal view of one of the cotypes from Stat. 305. > 2. ietra sibogae: ventra] view of the same specimen. 2. rlaometra sulcata: lateral view of the type specimen from Stat. 161. Natura] size. 1 vera: lateral view of the type specimen hom Stat. 175. Natura] size. Siho'ja Expeditie XLH. A.H. Cf ark, Unstalked Crirwidó . XXI. «W?**-^ 52 J.H. Paine phoK MELIOTYPIE, •-" -DAM. PLATE XXII. Veometra diana: dorsal view of the type specimen from Stal 294. 2. Neometra diana: lateral view of the same specimen. 2. mometra magna: dorsal view of the type specimen from Stat. 251. Natura! size. 5 metra margaritifera: lateral view of the type specimen from Stat. 226. 1. Pterometra venusta: dorsolateral view of one of the cotypes from Stat. 117. 2. Siboga ExpediHe XLII* All. ('f ark, Unstaiked Crirtoids . XXII. J.H. Paine phoL MEUOTYPIE. VAN PLATE XXIII. o. Daidalometra arachnoides : lateral view "t" a specimen the type of Stenome tra acuta) from Stat. 294. 2. i üometra philippinensis: lateral view of a specimen tin type of Cosmiometra helene) from St.it. 253. 2. otalometra marginalis: lateral view of the type specimen from Stat. !2Ö. 2. .3. Stiremetra perplexa: lateral view of the type specimen from Stat. 211. 2. Siboga ExpediHe \LUb A.H. ('f ark, UwtaUted Crirwidó . XXIII. 63 J.H. Paine phof. PLATE XXIV. Strotometra priamus: lateral view of a specimen from Stat. 26f>. 2. Strotometra priamus: oppositi ide of thi same specimen. 2. netra crassa: dorsolateral view of tlie type specimen from Stat. 259. Natura! size. I -sometra helius: lateral view of the type specimen from Stat. 254. Natura) size. Monachometra fragilis: lateral view of the type specimen from Stat. [66. Natural size. Monachometra fragilis: oppi 'Ie of the same specimen. Natural size. 70. Strotometra ornaiissima : dorsal view of the type specimen from Stat. 122. 2. 71. Perissometra timorensis: lateral ol the type specimen from Stat. 297. Natura! size. Siboga Expeditie XU\b A.H. Cf ark, UnstaUted Crinoids. XXIV 68 69 71 J.H. Paine phof. HELI0TYP1E, VAN PLAÏE XXV. Euantedon moluccana: dorsal view of the type specimen from Stat. 139. x 2. Euantedon moluccana: lateral view of the same specimen. 2. psometra longicirra: dorsal view of the type specimen from Stat. 167. 3. metra longicirra: ventral view of the same specimen. 3. Eutnetra aphrodite: dorsal view of a specimen from Stat. 294. 2. Compsometra iris: lateral view of the type specimen from Stat. 144. 2. 1 psometra iris: opposite side <>f the same specimen. 2. 1 Compsometra longicirra: lateral view of a specimen (the type of C. gracilipes) from Stat. 50, reef. 3. I ipsometra parvi flora: dorsal view of a specimen from Stat. 50. 3. . Compsometra parvijlora: ventral view of the same specimen. >. 3. Toxometra pauper a: lateral view of a specimen (the type of 'f. pur pur ca) from Stat. 96. X 2. I ometra pauper a: dorsal view of the same specimen. Siboga Expedil-ie XLIIb A.H. Clark, Unstalked Crinoidó : XXV J.H. Paine phoL HEUOTYPIE, WN LEER, AMSTERDAM. PLATE XXVI. : Lateral view of the type specimen from Stat. 253 with, at the left, a detached arm showing the pinnules. Natural size. : lateral view of the type specimen from Stat. 85. X 2. alcyon: lateral view of the type specimen from Stat. 251. rometra major: lateral view of the type specimen from Stat. 45. >< 2. metra inusitata: lateral view of the type specimen from Stat. 45. ,< 2. inusitata: dorsal view of the \imc specimen. 2. lomala: lateral view of the type specimen from Stat. 211. 3. ra minima: lateral view ol the type specimen from Stal. 48. 3. nrometra brevipes: lateral view of the type specimen from Stat. [50. 3. .'/'j — 36 Metres. Natural size. netra pulcherrima: ventral view of the specimen from St.it. [44, 45 Metres. Natural size. |Plate IX is a copy in colours of this photograph.j 1 arpenteri: ventral view of a specimen from Stat. 274. Tropiometra a/ra: lateral view of the specimen from Stat. 164. Natural size. ometrides adeonae: lateral view of a specimen from Stat. 273. 2. otnetrides adeonae: a detached arm pair from the same specimen. 2. adeonae: the same arm pair reversed ti> show the proximal pinnules. 2. lometra gr acilicirra: lateral view of the specimen from Stat. 30;. 2. Siboga Expeditie XLIl(' AM.Clark, Unstalked Crinoidó \ xxvm. *! ^ V^r J.H. Paine phoK Livr. LXXXIII. RÉSULTATS DES EXPLORATIONS ZOOLOGIQUES, BOTANIQUES, OCÉANOGRAPMQUES ET GÉOLOGIQUES ENTBEPBISES AUX INDES NÉERI.ANDiISE3 OBIENTAI.ES CÜ 1899 — 1900, a bord du SIBOOA SOUS J.E COMMANDEMENT DE G. F. TYDEMAN PUBLIÉS PAB M A. X W K B E R, Chef de 1'expédition. *1 lutroduction et description de 1'expédition, Max Weter. *I1. Lo batcau et sou équipement scientiGgue, G. V. Tydeman. *111. Ite'sultats hvdrographiques, G. F. Tyde in a u. IV. Forarainifera, (S. W. Winter f). *lX6is. Xenophyophora, F. E. Schnlze. V. Radiolaria, M. Hartman». *VI. Porifera, G. C. J. Vosmaer et I. Ijima '). *VII. Hydropoivpi, A. Billard '}. *VIII. Stylasterina, S. J. Ilickson et i\l"e II. M. England. *IX. Siphonophora, M"" Lens et van Riemsdijk. *X. Hydromednsae, O. Maas. *XL Scvphomedusac, O. Maas. *X1I. Cf'enophora, M"« F. Moser. *XIII. Gorgonidae, Alcyonidae, J. Vetsluys, S. .1. Hickson, [C. C. Nutting et J. A. Thomson '). *XIV. Pennatulidac, S.UJ. Hickson. *XV. Actiniaria, P. Me Murricb1). *XVI. Madreporaria, A. Alcock et L. Döderlein ■). •XVII. Antipatharia, A. J. van Pesch. XVIII. Turbellaria, L. vou Graff et R. R. von-Stummcr. XIX. Cestodes, J. W. Spengel. *XX. Nematomorpha, H. F. Nierstrasz. •XXI. Chaetogoatha, G. H. F o ir Ier. XXII. Nemeöihi, A. A. W. Hubrecht et Mme G. Stiasny. XX11I. Mvzostomidae, R. R. von Stummer. "XXIV. Polychaeta errantia, R. Horst '). XXTV'2. Polychaeta sedentaria, M. Ca uil e ry et F. Mesnil. *XXV. Gep'hyrea, C. Ph. Sluiter. «XXVI. Enteropueusta, J. W. Speugel. *XXVBt#. Pterobranchia, S. F. farmer. XXVII. Braehiopoda, J. F. vau Bemin e Ie n. *XXVIII. Polyzoa, S. F. Harmer '). • XXIX. Copepoda, A. Scott1)- *XXX. Ostracoda, G. W. Muller. *XXXI. Cirripedia, P. P. C. Hoek. * XXXII. Isopoda, H. F. Nierstrasz ')• XXXIII. Amphipoda, Ch. Pérez. •XXXIV. Caprellidae, P. May er. XXXV. Stomatopoda, H. J. Hanseu. *XXXVI. Cumacea, W. T. Cal man. * XXXVII. Schizopoda, H. J. Hansen. XXXVIII. Sergestidae, H. J. Hansen. * XXXIX. Decapoda, J. G. de Man, J.E.W.Ihle et J. J.Tescn1), *XL. Pantopoda, J. C. C. Loman. XLI. Halobatidae, J. Th. Oudemaus. *XLII. Crinoidea, É. Döderlein et Austin H. Clark. *XLIII. Echinoidea, J. C. H. de Meijere. *XLIV. Holothurioidea, C. Ph. Sluiter. *XLV. Ophiuroidea, R. Kohier. • XXVI. Asteroidea, L. Döderlein '). *XLVII. Solenogastres, II. F. Nierstrasz. • XXVIII. Chitonidae, H. F. Nierstrasz. *XLIX'. Prosobranchia, M. M. Schepman. •XLIX2. Prosobranchia parasitica, IL F. Nierstrasz et M. M. *L. Opisthobranchia, R. Bergh. [Schepman *LI. Heteropoda, J. J. Tesch. *Ln. Pteropoda, J. J. Tesch. *LHI. Lamellibranchiata, P. Pelseneer et Ph. Dautzenberg ') *LIV. Scapliopoda, M'le M. Boissevain. LV. Cephalopoda, L. Joubin. *LVI. Tunicata, C. Ph. Sluiter et J. E. W. Ihle. *LVII. Pisces, Max Weber. LVHI. Cetacea, Max Weber. *LIX. Liste des algues, Mm» A. Weber '). • LX. Halimeda, M»e E. S. Barton. (M>»e E. S. Gepp). *LXI. Corallinaceae, Mm» A. Weber et M. Fosliê. *LX1I. Codiaceao, A. et Mme E. S. Gepp. LXIII. Dinoflagellata. Coccosphaeridae, J. P. Lotsy. LXIV. Diatomaceae, J. P. Lotsy. *LXV. Deposita marina, O. B. B 5 g-gild. LXVI. Résultats géologiques, A. Wichmann. Siboga-Expeditie THE ÜNSTALKED GRINOIDS OF THE SIBOGA BV AUSTIN H. CLARK Washington, D. C, IVS. A. With XXVIII plates and 17 text figures Monographe XLII<5 of: UITKOMSTEN OP ZOOLOGISCH, BOTANISCH, OCEANOGRAPHISCH EN GEOLOGISCH GEBIED verzameld in Ne der land sch Oost-Indië 1899 — 1900 aan boord H. M. Siboga onder~ commando van Luitenant ter zee ie kl. G. F. TYDEMAN UITGEGEVEN DOOR Dr. MAX WEBER Prof. ia Amsterdam, Leider der Expeditie (met medewerking van de Maatschappij ter bevordering van het Natuurkundig Onderzoek der Nederlandsche Koloniën) BOEKHANDEL EN DRUKKERIJ ToomatES E. J. BRILL LEIDEN mi 9» Wïu 'iff-jllnimitm.i.. Publié Mars 1918 * Les numéros avec un astérique ont déja paru ; ceux marqués i) seulement en partie UCJa fr> U. Sooieiiptm» McOOfnpki** k l'ouvragc complet ti; ie l ^ Ph. Sluiter. DU II n der Siboga-Exj Mit iu Tafeln. ƒ 6. ,-.50 E. S. Barton. tncda. With ... '..40 - de l'expédition. F T\ ilp and applia entirjc 9— 5-/S : I. F. NierstraSZ I tUe Siboga-Exp. With 0 pi tl 4.90 •.III J. der Sil. dition. rjexl 3. — Alcock. b Madreporaria oi the Sibój » 575 C. Ph. Sluiter. Die SipunCuliden und Echiuriden der Siboga-Exp. .!.-•■ „3. — p- 3-75 C. J. Vosmaer and J. H. Vernhout. The Ponfera of the S plati 2.40 , 3. Otto Maas. Die Scyphomedusen dor Siboga-Expedition. Mit 12 Tafeln. , 7.50 ,, 9.50 ïny Moser. horen der Siboga-Expedition. Mit 4 Tafeln. , 2.80 „ 3,50 P. Mayer. Die Caprellidac der Siboga-Expedition. Mit 10 Tafeln. . 7.S0 . y.75 G. F. Tydeman. Hydjograpbic results of the Siboga-Expedition. With 3 charts of depths r y. — r 11.25 :. C. H. deMeijere. Die Echinoidea der Siboga-Exp. Mit 23 Tafeln. .15. \ 1S.75 I René Koehler. Opliiures de FExpédition du Siboga. i« 1 ihiurc? de Mer prdfonde. Avcc 3Ö Planchcs 16.50 „ 20.50 J. J. Tesch. The Thccosomata and Gymnosomata of the Siboga- ' ■>• • • -. *^. • ■ . , 3.75 „ 4.70 C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. dalen und holosomcn Ascidien. Mit 15 Tafeln 6.75 ( 9. A. Weber— van Bosse and M. Foslie. The CorallinaccacoftheSibo. and 34 textligures r 12.50 „ 15.50 Sydney J. Hickson and Helen M. England. The Stylastcrina of With 3 plates „ 1.50 CLVII1) H. F. NierstraSZ. Die Ghifonên der Siboga-Exp. Mit 8 Tafeln. , 5.— „ 6.25 2 ie 1 r. Xl.V/'i René Koehler. Ophiures de 1'Expéditión du Siboga. iittorales. Avcc 18 Planches f 10.25 „ I2.7« Sidney F. Harmer. The 1'terobranchia of the Siboga-Expedition, niut of other species. With 14 plates and 2 text-figures „ 6.75 „ 9. \X\Y1) W. T. Calman. The Cuniacea of the Siboga Expedition. With erres „ 1.S0 , 2.40 C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. nent zu derl. Abtcilung. Die socialen und holosomen Ascidien. Mit 1 Tafel. „ — .75 1. l Rud. Bergh. Die Opisthobranchiata der Siboga-Exped. Mit 20 Tafeln. „ 11.25 » '4-IO X) Otto Maas. Die Craspedoten Meduscn der Siboga-Exp. Mit 14 Tafeln. „ 9.25 . 12.50 nogr. Xllla) J. Versluys. Die Gorgoniden der Siboga-Expedition. II. Die Primnoidae. Mit 10 Tafeln, 178 Figuren im Text und ciner Katte , 16.75 IX) G. Herbert Fowler. The Chactognatha of the Siboga Expedition. With 3 nd 6 charts 4.20 T 5.25 •Il J- J- TeSCh. Die licteropoden der Siboga-Expedition. Mit 14 Tafeln. , 6.75 „ 9. — XXX) G. W. Muller. Die Dstracoden der Siboga-Exped. Mit 9 Tafeln.. , 3.50 „ 4.40 lonogr. 1\ ''.-, Franz Eilhard Schulze. Die Xenophyophorcn der Siboga-Exped. Mit ■ ' , 2.40 , 3.— ! IV) Maria Boissevain. The Scaphopoda of the Siboga Expedition. nd 39 textli % 4.S0 , 6.— 33' Livr. (Monogr. XXVI) J. W. Spengel. Studiën über die Entcropneusten der Siboga-Exp. Tafeln und 20 Figuren im Text v 14. — B 17.50 H. F. NierstraSZ. Die Nematomorpha der Siboga-Exp. Mit 3 Tafeln. „ 2.80 " 3.50 i Sydney J. Hickson und J. Versluys. Die Alcyonrden derSiboga- eudocladochonus 1. Mit 3 Tafeln und 16 Figuren im Text. „ 2.20 „ 2.75 P. P. C. Hoek. The Cirripedia of the Siboga Expedition. itculata. With 10 plates n 5.40 „ 6.7;, L. Döderlein. Die gestieften Crinoiden der Siboga-Expedition. Mit n im Text B 8. — . 10. Albertine D. Lens and Thea van Riemsdijk. The Sipffonopoóri n. With 24 plates and 52 textligures (.3.50 .. 16.75 M. M. Schepman. The Prosobrancliia otthe Expedrüofi. and Do i, with an Appendix by Prof. E. BERGH. res ( 4.S0 „ 6. — J. C. C. Loman. Die Pantapodtti der Siboga-Expedition. Mit 15 ") Text f ,',.25 , 7.80 J. E. W. Ihle. Die Appcndieularien dei Si [peditioti. Mit 4 4.S0 „ 6.— M. M. Schepman und H. F. Nierstrasz. Parasjiische Proso- 1.20 . 1.50 Prix: Souscription Monographies a l'ouvrage complet sepaiécs 43e Livr. (Moriogr. XLIX'£) 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. . „ 26. — „32.50 45e Livr. (Monogr. LVI£) C. Ph. Sluiter. Die Tunicaten der Siboga-Expedition. JI. Abteilung. Die Merosomen Ascidien. Mit 8 Tafeln und 2 Figuren im Text. „ 5.75 „- 7.25 46e Livr. (Monogr. XLIX'c) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part III. Gymnoglossa. With 1 platc „ — .80 „ 1. — : 47e Livr. (Monogr. XIII^) C. C. Nutting. The Gorgonacea of the Siboga Expedition. III. The Muriceidoe. With 22 plates „ 8.50 B 10.75 48e Livr. (Monogr. XIIIó') C. C. Nutting. The Gorgonacea of the Siboga Expedition. IV. The Plexauridae. With 4 plates ! „ 1.60 ., 2. — 49e Livr. (Monogr. hVld) 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. Xllïó2) C. C. Nutting. The Gorgonacea of the Siboga Expedition. V. The Isidse. 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 figures „ 12.75 „ 16. — 52e Livr. (Monogr. XIII^") C. C. Nutting. The Gorgonacea of the Siboga Expedition. VI. The Gorgonellidas. With 11 plates. . „ 4. — „ 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 figures „ 2.20 „ 2.75 54c Livr. (Monogr. XIII£4) C. C. Nutting. The Gorgonacea of the_ Siboga Expedition. VII. The Gorgonida:. Wifh 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 Cödiaceae of the Siboga Expedition including a -Monograph of Flabellarieae and Udoteaê. With 22 plates „ 12.50 -„ r5-50 57e Livr. (Monogr. X'III^3 C. C. Nuttirtg. The Gorgonacea of the Siboga Expedition. VIII. The Scleraxonia. With 12 plates „ 4.80 „ 6. — 58e Livr. (Monogr. XLTX'rf) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part IV. Rachiglossa. With 7 plates. . . . . . . , . . „ 5. — ■ „ 6.25 59e Livr. (Monogr." Vla1) G. C. J. Vosmaer.. The Porifera of the Siboga-Expedition. . II. The genus Spirastrella. With 14 plates „ 6.20 „ 7.75 6oe Livr. (Monogr. XXXIXrt1) J.- G. de Man. The Decapoda oi the Siboga Expedition. . Part II. Family Alpheidae „ 6.40 „ 8. — 61c Livr. (M!onogr. LUIrt) Paul PelSeneer. Les Lamellibranches de 1'Expédition du Siboga. Partie Anatomique. Avec 26 planches „ 10. — „ 12.50 62e Livr. (Monogr. XXIV' a) R. Horst. Polj'chacta errantia of the Siboga Expedition. Part I. Amphinomidae. With 10 jolates ,, 3.85 • ■„ 4.80 63e Livr. (Monogr. lAYlb) Ph. Dautzenberg et A. Bavay, Les Lamellibranches de 1'Expéd. du Siboga. Partie Systématique. I. Pectinidés. Avec 2 planches „ 2.25 „ 2.80 64e Livr. (Monogr. XLIXV) M. M. Schepman. The Prosobranchia of the Siboga Expedition. Part V. Toxoglossa. With 6 plates and 1 textfigure „ 4.80 „ 6. — 05e Livr. (Monogr. LVII) Max Weber. Die Fische der Siboga-ICxpedition. Mit 12 Tafeln und i23_ Figuren im Text „ 22. — „ 27.50 66e Livr. (Monogr. XLIX/) M. M. Schepman. The Prosobranchia, Pulmonata and Opistho- branchia Tectibratichiata Tribe Bullomorpha of the Siboga Expedition. Part VI. Pulmonata and Opisthobranchia Tectibranchiata Tribe Bullomorpha. With 2 plates , 1.7; ,, 2.20 67? Livr. (Monogr. XXXIö) P. P. C. Hoek. The Cirripedia of the Siboga-Expedition. B. Cirripedia sessilia. With 17 plates and 2 textfigures v . 8: — ., 10. — 6Se Lwr. (Monogr. LlXa) A. W^eber-van Bosse. Liste des Algues du Siboga. I. Myxophyceae, Chlorophyceae, Phaeophyceae avec le^concours de M, Tri. Reinbolp. Avec 5 planches et 52 figures dans Ie texte „ 6. — „ 7.50 69e Livr. (Monogr. XXXIXd ' chart . . . . / iu.75 ƒ13.50 J. E. W. Ihle. 1 1 brachyura 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. CONDITIONS GÉNÉRALES DE VENTE. ic. L'ouvrage du „Siboga" se composera d'une série de monographies. 2*. Ces monographies paraitront au fur et a mesure qu'clles seront pretes. 30. Lc prix de chaque monographie sera different, mais nous avons adopté comme base générale du prix de vente: pour une fcuille d'impression sans fig. flor. 0. 15; pour une feuille avcc fig. flor. 0.20 a 0.25; pour une planche noirc flor. 0.23; pour une planche coloriée flor. 0.4O; pour une photogravure flor. 0.60. 4°. Il y aura deux modes de souscription a. La souscription a 1'ouvrage complet. b. La souscription a des monographies separées en nombre restreint. Dans ce dernier cas. Ie prix des monographies sera majoré de 25 °/0- 50. L'ouvragi uni en volumes av