818 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Assoc, for 1898, 1899, p. 923; in Lankester, A treatise on zoology, pt. 3, Echinoderma, 1900, 

 pp. 137, 195. — Delaoe and Herodard, Traitd de Zoologie concrfcte, vol. 3, 1903, p. 394. — 

 MiNCKERT, Arch. Nat., Jahrg. 71, 1905, vol. 1, Heft 1, p. 166 (syzygies; regeneration). — A. H. 

 Clark, Proc. U.S. Nat. Miis., vol. 33, 1907, p. 130 (compari.son of proximal structure with 

 that of Antedon [Neo7nclra] imtUicnlor) ; Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 343 

 (included by P. H. Carpenter in the family Comatulidae). — ITamann, Bronn's Klassen und 

 Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1575. — A. II. Clark, Proc. U.S. Nat. Mus., 

 vol. 34, 1908, p. 210 (referred to Ateleorinidae), p. 212 (occurs in the West Indies and Hawaii), 

 pp. 436, 501; vol. 35, 1908, p. 119, fig. 18, p. 119 (arm structure); Amer. Nat., vol. 42, No. 503, 

 1908, p. 724 (color); vol. 43, 1909, p. 580 (pinnulation).— Proc. U.S. Nat. Mus., vol. 36, 1909, 

 p. 362 (pinnulation compared with that of ComatUia); vol. 38, 1910, p. 118 (basals retained). — 

 Kirk, Proc. U.S. Nat. Mus., vol. 41, 1911, p. 66 (belongs to Type 1 of free crinoids). — IIartlaub, 

 Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 386 (history), p 480 (detailed account).— 

 A. H. Clark, Notes Leyden Mus., vol. 34, 1912, p. 151 (compared with Atopocrinus) ; Crinoids 

 of the Indian Ocean, 1912, p. 10 (occurs in the Hawaiian Is.; absent from Japan), p. 27 (range), 

 p. 63 (only genus in the family), p. 252 (original reference; type species); Internat. Rev. gesarat. 

 Hydrobiol. und Hydrogr., vol. 6, 1914, pp. 6 and following (occurs in both Atlantic and Indo- 

 Pacific; range and its significance); Die Crinolden der Antarktis, 1915, p. 182 (same); Smith- 

 sonian Misc. Coll., vol. 65, No. 10, 1915, pp. 11 and following (phylogenetical study); Unstalked 

 crinoids of the Siboga-'Es.pod., 1918, p. viii (discovery of a new type [Sibogacrinus] by the Siboga), 

 p. 262 (in key), p. 266 (key to the included species); Univ. Iowa Studies in Nat. Hist., vol. 9, 

 No. 5, 1921, p. 13 (West Indies and Indo- Pacific), p. 16 (in key) ; The Danish Ingolf-Expad., 

 vol. 4, No. 5, Crinoidea, 1923, p. 44 (range, and included Atlantic species). — Gisl^n, Zool. 

 Bidrag Uppsala, vol. 9, 1924, pp. 44, 47, 55, 61 (obliquity of brachial articulations), p. 131, 

 p. 212 (pinnule gap retained). — ^Mortensen, Handbook of the echinoderms of the British Isles, 

 1927, p. 22 (diagnosis). — Gisl£n, Kungl. Fysiogr. Siillsk. Handl., new ser., vol. 45, No. 11, 1934, 

 p. 18. — Cd^not in Grass6, Traits de zoologie, vol. 11, 1948, pp. 39, 71. — Gisl^n, Rep. Swedish 

 Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 55 (depth range). — Hyman, The invertebrates, 

 vol. 4, Echinodermata, 1955, p. 53 (basals may be visible), text-fig. 23 A and B, p. 95. 



Diagnosis. — A genus of Atelecrinidae in which the arms are 10 in number, IBr 

 series with the IBrj axillary being present; the first syzygy is between brachials 34-4; 

 there are no pinnules before the seventeenth (more rarely the thirteenth) brachials; 

 basals are present, visible as lovr triangles in the interradial angles of the calyx, some- 

 times, especially in small individuals, in contact by their attenuated lateral angles 

 beneath the radials; the cirrus sockets are flanked on either side by a high elevation 

 triangular in profile, the 2 elevations on either side of a socket being sometimes, especial- 

 ly in small specimens, joined by a rim about the proximal (ventral) border of the socket 

 forming with this a horseshoe-shaped ventrolateral rim highest at its two ends ; the cirri 

 are long, very gently curved, slender and delicate, usually lost in capture, composed of 

 more than 20 segments, of which the earlier are much elongated and the terminal 2 or 

 3 are about twice as long as broad; the terminal claw is conical and minute. 



Type species. — Atelecrinus balanoides P. H. Carpenter, 18S1. 



Geographical range. — From the Hawaiian Islands to Fiji and the Moluccas; from 

 Brazil northward to Florida; western coast of Ireland. 



Bathymetrical range.— Fvom 532 [?384] to 1256 [?1479] meters. 



Thermal range.— Fioia 3.89° C. to 8.61° C. 



KEY TO THE SPECIES OF ATELECRINUS 



a'. Centrodorsal with 15 columns of cirrus sockets (Hawaiian Islands; 1009-1479 meters). 



conifer (p. 819) 

 o'. Centrodorsal with 10 columns of cirrus sockets. 

 b'. Columns of cirrus sockets segregated into 5 pairs by relatively broad naked interradial areas; 



