566 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



mm. long, with 31 segments, resembling P 2 but just perceptibly stouter. P 4 is 11.5 

 mm. long, with 21 segments, as stout basally as P! but tapering more evenly. P 6 is 

 6.5 mm. long, with 16 segments. P is 5 mm. long, with 12 segments. P 7 is 4.5 mm. 

 long, with 12 segments, not stiffened like the preceding pinnules. The following 

 pinnules are similar. The distal pinnules are 7 mm. long, with 18 segments. 



The division series are moderately separated laterally. 



In alcohol the dorsal pole of the centrodorsal and the division series and arm bases 

 as far as the third bracbial are light grayish, thickly sprinkled with minute spots of 

 white. The first syzygial pairs and the adjacent portions of the second and fifth 

 brachials are blackish brown. The remainder of the arms is white, with narrow 

 black bands at intervals of about 5 mm. The entire ventral perisome is olive-green, 

 with numerous small white spots. The cirri are white. 



Notes. The five specimens from off Gopalpore have 34, 36, 39, 40, and 42 arms. 



In the specimen from Investigator station 549 the 40 arms are 90 mm. long. The 

 color is white; the first syzygial pair is deep purplish brown, the syzygial pairs collec- 

 tively forming a conspicuous narrow ring about the central portion of the animal; 

 the following syzygial pah's and the immediately adjacent proximal and distal brachi- 

 als are also deep brownish purple. 



Remarks. This species appears to be most nearly related to D. flagellata, from 

 which it may be easily distinguished by the much longer and much slenderer proximal 

 pinnules, which are composed of very much longer segments, the small size of P 4 , 

 which is as small as PI instead of being as large as P 2 or P 3 , and by the entire absence 

 of the rugose appearance so characteristic of D. flagellata. 



Localities. Bengal Fisheries steamer Golden Crown; off Gopalpore; 54-69 meters 

 [A. H. Clark, 1912, 1913, 1918] (5, U.S.N.M., 35225, 35258; I.M.). 



Investigator station 549; Mergui Archipelago, northwest of King Island (lat. 

 1248'00" N., long. 9816'10" E.); 44 meters; mud, sand, and shells; October 21, 

 1913 [A. H. Clark, 1932] (1). 



Geographical range. Bay of Bengal, from Gopalpore on the west to the Mergui 

 Archipelago on the east. 



Bathymetrical range. From 44 to 54 (?69) meters. 



History.' This species was originally described in 1912 from five specimens that 

 had been dredged by the Bengal steam trawler Golden Crown off Gopalpore. Later 

 another specimen was dredged by the Investigator at station 549. 



Genus MARIAMETRA A. H. Clark 



Antedon (part) BELL, Proc. Zool. Soc. London, 1894, p. 396, and following authors. 



Himerometra (part ) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, pp. 237, 308. 



Dichrometra (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22. 1909. p. 13. 



Mariametra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 144 (diagnosis; genotype 

 Himerometra subcarinata A. H. Clark, 1908), p. 176 (referred to the Mariametrinae) ; Mem. 

 Australian Mus., vol. 4, pt. 15, 1911, p. 725 (absent from Australia) ; Proc. Biol. Soc. Washington, 

 vol. 25, 1912, p. 24 (ornamentation of division series compared with that of Zygcmetra punclata); 

 Crinoids of the Indian Ocean, 1912, p. 9 (absent from Australia), p. 11 (occurs west to the 

 Andamans); p. 22 (distribution in detail), p. 57 (in key), p. 139 (original reference; type); 

 Proc. Biol. Soc. Washington, vol. 26, 1913, p. 141 (referred to the Mariametridae), p. 142 (in 

 key), p. 144 (synonymy; genotype; range; depth; included species); Unstalked crinoids of the 



