116 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



History. The two known specimens of this species were recorded by me under 

 the name Oligometra japonica in my report on the third consignment of crinoids 

 received from the Albatross Philippine expedition which was published in 1911. 

 They had been dredged at Albatross station 5356. In my memoir on the crinoids of 

 the Indian Ocean published in 1912 I listed Oligometra japonica and gave as the range 

 southern Japan and the Philippine Islands in 55-58 fathoms. The locality Philippine 

 Islands and the depth 58 fathoms refer to the present species; the depth 55 fathoms 

 refers to the type specimen of Prometra owstoni. The type specimen of Hartlaub's 

 Antedon japonica was without a depth record. In a detailed description of Prometra 

 owstoni published in 1916 I said that "Prometra owstoni is most nearly related to 

 P. longipinna A. H. Clark from the Philippine Islands in 58 fathoms," the latter 

 name here occurring for the first tune. In my report on the unstalked crinoids of the 

 Siboga expedition published in March 1918, Prometra longipinna was formally 

 described from a single specimen from Albatross station 5356 and was included in the 

 key to the species of Prometra. On May 16, 1918, Prometra longipinna was again 

 formally described as a new species, the description being based upon the same 

 specimen as the preceding one in the Siboga report. 



Genus COLOBOMETRA A. H. Clark 



Antedon (part) P. H. CARPENTER, Notes Leyden Mus., vol. 3, 1881, p. 178, and following authors. 



Cyllometra (part) A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 357. 



Colobometra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 5 (diagnosis; genotype 

 Antedon perspinosa P. H. Carpenter, 1881); Proc. U. S. Nat. Mus., vol. 36, 1909, p. 362 

 (deficient pinnulation like Comatilia); Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 174 

 (included in the family Colobometridae) ; Proc. U. S. Nat. Mus., vol. 40, 1911, p. 6 (Antedon 

 serripinna of Chadwick is a new species of this genus [Promelra]) , p. 14 (occurs in the Red 

 Sea but no farther south [refers to Prometra]); Mem. Australian Mus., vol. 4, 1911, pp. 730, 

 731 (in keys), p. 735 (1 species in Australia), p. 773 (original reference; characters; range); 

 Proc. Biol. Soc. Washington, vol. 25, 1912, pp. 25, 27 (lower pinnules compared with those 

 of Eudiocrinus pinnatus); Crinoids of the Indian Oceau, 1912, p. 10 (absent from Japan; 

 reason), p. 11 (represented in the Ceylon region; western limit of the large species is Ceylon), 

 p. 12 (represented in the Red Sea region [Prometra]), p. 22 (distribution in detail), p. 57 

 (in key), p. 164 (original reference; type). HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, 

 No. 4, 1912, p. 371 (discussion). A. H. CLARK, Unstalked crinoids of the /Szboja-Exped., 

 1918, p. 112 (in key), p. 123 (key to the included species). GISLEN, Kungl. Fysiogr. Sallsk. 

 Handl., newser., vol. 45, No. 11, 1934, p. 18. A. H. CLARK, Temminckia, vol. 1, 1936, p. 305. 

 H. L. CLARK, Echinoderm fauna of Australia, 1946, p. 48 (in key), p. 52. 



Diagnosis. A genus of Colobometridae including medium-sized to large species 

 with 10 arms 40-170 mm. long; the long and rather slender cirri have 29-65 segments 

 of which the proximal have their distal ends fringed with spines and the distal, which 

 are shorter than the proximal, are much broader than long and bear dorsally prom- 

 inent paired, or rarely single, dorsal spines; one or more pairs of proximal pinnules are 

 elongated, much stiffened, and composed of elongated segments with very spiny 

 distal ends; P a is usually absent; the segments of all the pinnules, and the brachials, 

 have spiny distal ends. 



Geographical range. From Fiji, the Philippine Islands, and Singapore southward 

 to the Solomon Islands, Lord Howe Island, and Port Denison, Queensland, and 

 westward to the Red Sea. 



Bathymetrical range. From the shore line down to 106 meters. 



