PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 275 



that the shape of the brachials is dependent more on the magnitude of the specimen 

 but that the greater number of cirrus segments in tenuicirra and the different pro- 

 portions of the first two pinnules do provide rehable characters for the distinction of 

 the two species. 



Genus COCCOMETRA A. H. Clark 



Comatula (part) PouKTALiis, Bull. Mus. Comp. ZooL, vol. I, No. 6, 1808, p. 105. 



Comatula {Alecto) (part) PouRTALfes, Bull. Mus. Comp. Zool., vol. 1, No. 6, 1868, p. 111. 



Antedon (part) PouRTALfes, Bull. Mus. Comp. Zool., vol. 1, No. 11, 1869, p. 355, and following authors. 



Coccometra A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128 (diagnosis; type species 

 Comatula hagenii Pourtalfes, 1868), p. 136 (referred to Antedonidae, restricted); Proc. U.S. Nat. 

 Mus., vol. 34, 1908, p. 211 (referred to Antedonidae, restricted), p. 212 (occurs in the West 

 Indies); Amer. Nat., vol. 42, No. 603, 1908, p. 724 (color); Geogr. Journ., vol. 32, No. 6, 1908, 

 p. 606 (color); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 177 (referred to Thysanometrinae) ; 

 Proc. U.S. Nat. Mus., vol. 40, 1911, p. 10 (represents the East Indian Thysanometra in the West 

 Indies); Amer. Journ. Sci., ser. 4, vol. 32 (whole number 182), 1911, p. 129 (characteristic of the 

 West Indian fauna; significance); Crinoids of the Indian Ocean, 1912, p. 14 (corresponds to the 

 East Indian Thysanometra), p. 26 (related to Thysanometra); Internat. Rev. gesamt. Hydrobiol. 

 und Hydrogr., vol. 6, 1914, pp. 6 and following (represents in the Atlantic Thysanometra of the 

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

 represented in the Indo-Pacific by Thysanometra); Journ. Washington Acad. Sci., vol. 7, 1917, 

 No. 5, p. 127 (referred to Thysanometrinae); No. 16, p. 507 (in key; range); Unstalked crinoids 

 of the Siboga-Exped., 1918, p. 217 (in key; range), p. 218 (key to the included species); Univ. 

 Iowa Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 12 (confined to the West Indies), p. 17 (in key); 

 The Danish Ingolf-F,xped., vol. 4, No. 5, Crinoidea, 1923, p. 41 (range; included species). — 

 GisL^N, Zool. Bidrag Uppsala, vol. 9, 1924, p. 238. — H. L. Clark, Mem. Mus. Comp. Zool., 

 vol. 55, 1938, p. 47.— A. H. Clark, Mem. Soc. Cubana Hist. Nat., vol. 14, No. 2, 1940, p. 139.— 

 GisL^N, Rep. Swedish Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 55 (one species occurs below 

 1,000 meters). 



Cocometra H. L. Clark, Univ. Iowa Monographs, ser. 1, No. 15; Bull. Lab. Nat. Hist. Univ. Iowa, 

 vol. 7, No. 5, April 1918, p. 12 (emendation). 



Diagnosis. — A genus of Thysanometrinae in which the radial facets have long 

 narrow triangular muscular fossae, separated from the interarticular ligament fossae 

 by strongly diagonal and straight ridges; the centrodorsal is hemispherical or sub- 

 conical; the distal pinnules tend to be shorter than the proximal ones. The color 

 pattern is apparently characteristic of the species. 



Type species. — Comatula hagenii Pourtal&s, 1869. 



Geographical range. — From North Carolina to Yucatan, Cuba, Jamaica, and 

 Porto Rico. 



Bathymetrical range. — From 14 to 1046 meters. 



KEY TO THE SPECIES OF COCCOMETRA 



a'. Cirrus segments 24-28; cirri very slender, with the fourth and following segments greatly elongated, 

 4 to 5 or more times as long as broad; terminal claw straight, tapering to a sharp point; arms 

 60-70 mm. long in the unique holotype; a large black spot on either side of each syzygial 

 pair; Pi 9 mm. long with 35-40 segments; Pj 5 mm. long with 12-15 segments (southeast of 



Santiago de Cuba; 464 meters) guttata (p. 278) 



o'. Not more than 25 cirrus segments, of which the distalmost are much shorter than the elongate 



proximal, the penultimate being about as long as broad and the antepenultimate and at least 



one of those immediately preceding being less than twice as long as broad; terminal claw recurved. 



6'. Segments in the distal half of Pi becoming elongated, twice as long as broad, with very spinous 



distal edges; division series and proximal portion of the arms with a prominent black median 



line; remainder of arms with a large median black spot on each syzygial pair; elements of the 



558-622 — 67— :— 19 



