538 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



6'. About 20 arms 70-115 mm. long; P 3 stout, stiff, and rigid, conspicuously longer and stoutei 

 than P 2 ; cirri 25-35 mm. long, with 30-43 segments, of which the distal are about as long as 

 broad and carinate dorsally without dorsal tubercles or spines (southern Japan from Korean 



Straits to Sagami Bay; 0-153 meters) stylifer (p. 538) 



6 2 . More than 20 (usually 30 or more) arms; P 3 not so conspicuously different from adjacent pin- 

 nules; outer cirrus segments usually with dorsal tubercles or more or less developed spines, 

 rarely simply carinate. 



e 1 . Lower pinnules very unequal, P 2 being nearly or quite twice as long as Pj and P 3 (largest and 

 longest pinnule on arm) usually much longer than P 2 , with 30-36 segments; outer cirrus 

 segments simply carinate dorsally, or with small spines; 36-40 arms 100-215 mm. long; 

 cirri XXX-XL, 25-35, up to 35 mm. long (from Amboiua to Philippines; littoral) 



bimaculata (p. 541) 



c l . Lower pinnules much less unequal, P a being usually much less than twice as long as PI, and 

 P 3 not greatly longer than P 2 , with usually fewer, or at least not more, segments; distal 

 cirrus segments with dorsal tubercles or spines. 



d l . Lower pinnules rather stout, P 2 and Pa composed of segments most of which are not longer 

 than broad; synarthrial and articular tubercles more or less developed, giving the proxi- 

 mal portion of the animal a rugged or rugose appearance. 



e 1 . PI, P 2 , and P 3 not greatly different in length and stoutness; rugosity of division series 

 and arm bases not very marked; 29-50 arms 75-85 mm. long; cirri XX-XLIII, 23-36; 

 PS 10 mm. long with 22-24 segments (east Africa from Lamu, Kenya, south to Durn- 



ford Point, Zululand, and Madagascar; 0-164 meters) afra (p. 558) 



e 2 . Pj markedly longer than PI, and P 3 markedly longer than P 2 ; Pj and P 3 more or less; 

 enlarged and stout; rugosity of division series and arm bases usually well marked; 

 14-40 (averaging about 30) arms 65-150 (usually about 110) mm. long; cirri XX-XL, 

 22-35 (usually 25-30), 15-30 (usually 15-25) mm. long; P 3 9-18 mm. long, with 21-38 

 (usually 25-30) stout segments (Hongkong to Pelew and Admiralty Islands and New 



Guinea, and westward to Singapore; 0-45 meters) flagellata (p. 544) 



d 1 . Lower pinnules slender, P 2 and P 3 composed of segments most of which are much longer 

 than broad; division series and arm bases smooth, without synarthrial and articular 

 tubercles. 



e 1 . More robust, with more numerous (45-47) arms, lower pinnules stiffer and more wiry, 

 with fewer segments; PI has 15-24 segments; Pj has 28-29 segments; and P 3 has 

 27-29 segments (southern Japan from Sagami Bay to Korean Straits, and southward 



to Cochinchina; 0-150 meters) doderleini (p. 562) 



e 2 . Less robust, with less numerous (34-42) arms, lower pinnules less stiff and wiry, with 

 more numerous segments; P! has 29 segments; Pj has 34 segments; and P 3 has 31 

 segments (Bay of Bengal from Gopalpore on west to Mergui Archipelago; 44-54 [?G9) 

 meters) ciliata (p. 565) 



DICHROMETRA STYUFKK (A. H. Clark) 



PLATE 59, FIGURE 274; PLATE 61, FIGURE 283 

 [See also vol. 1, pt. 2, fig. 313 (proximal pinnules), p. 223; pi. 11, fig. 1027 (distal arm fork).] 



Antedon stylifer A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 127 (color in life), p. 149 (de- 

 scription; Albatross Sta. 4929); Unstalked crinoids of the Siboga Exped., 1918, p. 104, footnote 1 

 (synonym of Dichrometra doderleini). 



Himerometra stylifer A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 1907, p. 356 (listed); Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 266, fig. 2 (Kagoshima Bay; specimen with distal arm division), 

 p. 317 (Japan). 



Dichromelra slylifer A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 149 (synonymy; range); 

 Proc. Biol. Soc. Washington, vol. 26, 1913, p. 144 (listed). 



Dichrometra doderleini (part) A. H. CLARK, Unstalked crinoids of the Siboga Exped., 1918, p. 104 

 (in key; range). 



