A MONOGRAPH OF THE EXISTING CRINOIDS 279 



Genus CRINOMETRA A. H. Clark 



Comatula (part) Pourtales, Bull. Mus. Comp. Zool., vol. 1, No. 0, 186S, p. 111. 



Aniedon (part) Pourtales, Bull. Mus. Comp. Zool., vol. I, No. 13, 1869, p. 357, and following authors. 



Actinomelra (part) P. H. Carpenter, Bull. Mus. Comp. Zool., vol. 9, No. 4, 1881, p. 162. 



Spinifera group (part) P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 212. 



Granulifera group (part) P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 241. 



Brevipinna group Minckert, Arch. Naturg., Jahrg. 71, vol. 1, Heft 2, August 1905, p. 224 (defini- 

 tion; represented by Aniedon brevipinna only). 



Charitomelra (part) A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 361. 



Crinometra A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 22 (diagnosis; genotype 

 Comatula brevipinna Pourtales, 1868), p. 144 (ornamentation compared with that of Mariamelra); 

 Vid. Medd. Nat. Foren. K0benhavn, 1909, p. 147 (agrees in the variation in the IIBr series 

 with Pachylomelra its East Indian representative); Proc. U. S. Nat. Mus., vol. 40, 1911, p. 10 

 (represents in the West Indies the East Indian Pachylomelra and Glyplomelra) ; Crinoids of the 

 Indian Ocean, 1912, p. 13 (corresponds to the East Indian Pachylomelra and Glyplomelra), p. 24 

 (range in detail; for zoogeographic purposes may well be considered as one with Pachylomelra 

 and Glyptometra). — Hartlacb, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 286 (discus- 

 sion). — A. H. Clark, Internat. Rev. Gesamt. Hydrobiol. und Hydrogr., 1914, pp. 4 and fol- 

 lowing (represents Pachylomelra and Glyptometra in the Atlantic; range and its significance); 

 Die Crinolden der Antarktis, 1915, p. 181 (range; represents in the Atlantic the Indo-Pacific 

 Pachylometra and Glyptometra). — F. W. Clarke and Wheeler, U. S. Geol. Surv. Prof. Pap. 

 90-L, 1915, p. 195 (inorganic constituents of the skeleton); Prof. Pap. 102, 1917, pp. 23 and fol- 

 lowing (same). — A. H. Clark, Unstalked crinoids of the Szioga-Exped., 1918, p. 171 (in key; 

 range), p. 186 (discussion, with list of included described forms); Journ. Washington Acad. 

 Sci., vol. 9, No. 5, 1919, p. 136 (arm bases compared with those of Holopus) ; Univ. Iowa Studies 

 in Nat. Hist., vol. 9, No. 5, 1921, p. 12 (confined to the West Indies), p. 19 (in key).— F. W. 

 Clarke and Wheeler, U. S. Geol. Surv. Prof. Pap. 124, 1922, p. 20 (inorganic constit- 

 uents of the skeleton). — A. H. Clark, The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 

 1923, p. 40 (range), p. 51 (in key). — Gislen, Zool. Bidrag Uppsala, vol. 9, 1924, p. 231 (irregular 

 division series). — Pelseneer, Bull. Soc. Zool. France, vol. 53, 1928, p. 173 (parasitized by 

 Eulima [Sabinella], sp.). — Gislen, Vid. Medd. Dansk Nat. Foren. K0benhavn, vol. 93, 1933, 

 pp. 480-482; Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 23, 25, 29. 



Diagnosis. — A genus of Charitometridae in which the genital pinnules taper evenly 

 from the usually more or less broadened earlier segments to a delicate tip, the portion 

 beyond the gonad being much longer than the gonad itself; the division series and arm 

 bases are rounded dorsally, with or without a fine abruptly raised median line and a 

 tubercular ornamentation on the division series and arm bases; and the oral pinnules are 

 markedly longer than the genital and distal pinnules, which are unusually short. 



Geographical range. — From the Yucatan Bank, the Florida Keys, northern Cuba, 

 and the southern Bahamas eastward and southward along the Antillean chain to 

 Barbados and Grenada; also St. Helena. 



Bathymetrical range. — -From 139 to 707 meters. 



Thermal range.— From 8.33° to 18.20° C. 



History. — The first description of a species of this genus was by Count L. F. 

 de Pourtales who in 18G8 referred it to the genus Comatula, transferring it to Antedon in 

 the following year. It was referred to Actinometra by Dr. P. H. Carpenter in 1881, but 

 transferred to Antedon in 1883. In his memoir on the comatulids of the Challenger 

 Expedition published in 1888 Carpenter placed different forms of the species in his 

 Spinifera and Granulifera groups of Antedon, and in 1905 Minckert established the 

 Brevipinna group for it. 



