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. DELAGE and HEROUARD, TraitiS de Zoologie concrete, 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. Mus., vol. 33, 1907, p. 130 (comparison of proximal structure with 

 that of Antedon [Neomctra] multicolor'); Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 343 

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

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

 vol. 34, 1908, p. 210 (referred to Atelecrinidae), 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 Comatilia) ; 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). HARTLAUB, 

 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. gesamt. 

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

 Pacific; range and its significance); Die Crinoiden 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 iSi6o<70-Exped., 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-Exped., 

 vol. 4, No. 5, Crinoidea, 1923, p. 44 (range, and included Atlantic species). GISLEN, 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). GISLEN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, 

 p. 18. CUENOT in Grasse 1 , Traite 1 de zoologie, vol. 11, 1948, pp. 39, 71. GISLEN, 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 IBr 2 axillary being present; the first syzygy is between brachials 3+4; 

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

 basals are present, visible as low 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, 1881. 



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

 Brazil northward to Florida ; western coast of Ireland. 



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



Thermal range. From 3.89 C. to 8.61 C. 



KEY TO THE SPECIES OF ATELECRINUS 



a 1 . Centrodorsal with 15 columns of cirrus sockets (Hawaiian Islands; 1009-1479 meters). 



conifer (p. 819) 

 a*. Centrodorsal with 10 columns of cirrus sockets. 



ft 1 . Columns of cirrus sockets segregated into 5 pairs by relatively broad naked interradial areas; 



