").'!S BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



V. About '20 arms 70-1 15 mm. loDg; P» stout, stiff, and rigid, conspicuously longer and stouter 

 tlian l\; cirri 2"> .'!"> nun. 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 Hay; 0-153 meters) stylifer (p. 538) 



6 1 . More than 20 (usually 30 or more) arms; 1' 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 

 c 1 . Lower pinnules very unequal, Pi being nearly or quite twice as long as Pi and P 3 (largest and 

 longest pinnule on arm) usually much longer than Pj, with 30-3f) segments; outer cirrus 

 segments simply carinate dorsally, or with small spines; 30-40 arms 100-215 mm. long; 

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



bimaculata (p. 541) 

 c*. 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 a , with usually fewer, or at least not more, segments; distal 

 cirrus segments with dorsal tubercles or spines. 

 (/'. Lower pinnules rather stout, P 2 and P> 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'. Pi, Pj, 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 Laniu, Kenya, south to Durn- 



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



e 1 . P2 markedly longer than Pi, and Pj markedly longer than P 3 ; P| and Pj 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; Pj 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 Blender, P 2 and P a 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; Pi has 28-29 segments; and Pj has 



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



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



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

 more numerous segments; Pi has 29 segments; P a has 34 segments; and P$ has 31 

 segments (Bay of Bengal from Gopalpore on west to Mergui Archipelago; 44-54 [?69) 

 meters) cilia ta (p. 565) 



DICHROMETRA STYLIFER (A. H. Clark) 



Plate 59, Figdre 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 dbderleini). 



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). 



Dichrometra stylifer A. H. Clark, Crinoids of the Indian Ocean, 1912, p. 149 (synonymy; range); 

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



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

 (in key; range). 



