214 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Genus CRASPEDOMETRA A. H. Clark 



Antedon (part) P. H. CARPENTER, Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 509, and following 

 authors. 



Himerometra (part) A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 1907, p. 356. 



Craspedometra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 8 (diagnosis; genotype 

 Antedon acuticirra P. H. Carpenter, 1882), p. 175 (referred to the Himerometrinae) ; Mem. 

 Australian Mua., vol. 4, 1911, pp. 731, -732 (in keys), p. 735 (1 species in Australia), p. 763 

 (original reference; characters; range); Crinoids of the Indian Ocean, 1912, p. 10 (does not 

 extend beyond Hongkong; absent from Japan; reason), p. 11 (occurs both east and west of 

 Ceylon), p. 12^(represertedjin Red^Sea'region and in southeast African region), p. 21 (distri- 

 bution in detail), p. 56 (in key), p. 117 (original reference; type). 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. 23ff. j (same). A. H. CLARK, Unstalked crinoids of the Si&ojo-Exped., 

 1918, p. 72 (in key; range). F. W. CLARKE and WHEELER, U. S. Geol. Surv. Prof. Pap. 124, 

 1922, p. 20 (inorganic constituents of the skeleton). GISLEN, Kungl. Fysiogr. Sallsk. Handl., 

 new ser., vol. 45, No. 11, 1934, p. 44. 



Diagnosis. A genus of Himerometridae in which the cirri are long, with 40-60 

 segments, nearly straight or slightly curved, tapering gradually from a stout proximal 

 portion to a sharply pointed tip, with the distal segments much longer than broad 

 and without dorsal processes; there is no opposing spine, and the terminal claw is 

 nearly straight. P D is shorter and more slender than PI, which in turn is shorter and 

 more slender than P 2 . The IIIBr series are usually developed only on the inner side 

 of the IIBr series, and are 2; if they are developed both interiorly and exteriorly 

 they are commonly 2 interiorly and 4(3+4) exteriorly. 



Geographical range. From the Gulf of Martaban and the Andaman Islands to 

 Amboina, and northward to the Philippine Islands. 



Bathymetrical range. Littoral and sublittoral; the only recorded depth is 33 

 meters. 



Remarks. While the single species included in this genus is, because of the long, 

 nearly straight, gradually tapering, sharp pointed and smooth cirri, strikingly different 

 in its general appearance from the species of Heterometra it scarcely deserves to be 

 separated from them. It agrees with them in all its other characters. Moreover, 

 slight dorsal tubercles are present in one of the known specimens on the outer cirrus 

 segments, while in some of the species of Heterometra these are so slight as to be barely 

 noticeable. 



History. The single species now included in this genus was originally described 

 hi 1882 in the genus Antedon under four different names. With my first revision of 

 the old genus Antedon in 1907 this species was placed in the new genus Himerometra. 

 In 1909 the genus Craspedometra was established with Antedon acuticirra P. H. 

 Carpenter, 1882, as the genotype, and the nominal species listed as referable to it 

 were Craspedometra acuticirra, C. australis, C. bipartipinna, and C. ludovici, all of 

 which represent in reality the same form. 



In 1911 I described two new species under the names Craspedometra ater and 

 C. madagascarensis, and in 1912 in my monograph of the crinoids of the Indian Ocean 

 I listed these, gave the name Craspedometra amboinae to the specimens from Amboina 

 referred by Hartlaub in' 1891 to Antedon ludovici, and referred Carpenter's Antedon 

 anceps to the genus Craspedometra. In 1913 Dr. A. Reichensperger used the names 

 Craspedometra amboinae and C. anceps and suggested that the specimen he referred 



