158 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



KEY TO THE SPECIES IN THE GENUS CAPILLASTER 



a'. Cirri absent; centrodorsal reduced to a small stellate plate lying within the radial circlet (China 



Sea to the Borneo Bank; 0-59 meters) macrobrachius, p. 158. 



a-. Cirri present. 



b'. Cirri few, not more than X, in the distal half tapering to a fine tip, composed of elongated 

 segments of which the terminal are only very slightly, if at aU, shorter than the longest 

 proximal, and, except for a minute opposing spine, show no trace of dorsal processes (Sunda 



Straits; 35 meters) asterias, p. 160. 



b-. Cirri more than X, not tapering distally; distal cirrus segments much shorter than the longest 

 proximal and always with conspicuous dorsal processes, 

 c'. Arms more than 40 (usually more than 60) in number; longest cirri with 30 or more (30-40, 

 usually about 30) segments. 

 rf'. Distal cirrus segments much broader than long (Maldive Islands and Ceylon to Western 



Australia, the Moluccas, and the Philippines; 0-135 meters) sentosa, p. 160. 



cP. Distal cirrus segments about as long as broad (Java Sea; 88 meters)- gracilicirra, p. 169. 

 C-. Seldom more than 35 (usually 15-30) arms; longest cirri with not more than 30, and seldom 

 more than 26, segments. 

 d'. Outer cirrus segments slightly longer than broad (Java Sea and the coast of Ceram; 



82-118 meters) tenuicirra, p. 209. 



d^. Outer cirrus segments broader than long. 



e'. Size large (arm length 160 mm.); division series perfectly smooth; entire animal mot- 

 tled with whitish; disk without calcareous concretions (southwestern Japan; 0-108 



meters) mariae, p. 170. 



e-. Size medium (arm length very rarely over 125 mm. and never so much as 150 mm.); 



ossicles of the division series usually with finely spinous distal edges, so that the 



division series appear rough; no whitish mottling; disk usually with calcareous 



nodules more or less developed. 



/'. Larger, stouter and more robust; usually 15-25 arms; IIIBr series often present; 



usually more than 23 cirrus segments (Maldive Islands and Ceylon to tropical 



Australia, the Caroline Islands, the Philippines and Formosa; 0-292 meters). 



multiradiata, p. 173. 



/-. Small, slender and weak, with 12-19 arms; IIIBr series never present; 21-23 cirrus 



segments (Madagascar and Mauritius) coccodistoma, |). 212. 



CAPILLASTER MACROBRACmUS (Hartlaub) 



Plate 8, Figures 25, 26 



Actinometra macrobrachius (Liitken, MS.) Hartlaub, Nachr. Ges. Gottingen, May, 1890, p. 186 

 (description; China Sea); Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 101 (detailed 

 description and comparisons; China Sea). — Hamann, Bronns Klassen u. Ordnungen des Tier- 

 Reichs, vol. 2, Abt. 3, 1907, p. 1585 (listed).— A. H. Clark, Vidensk. Medd. fra den naturh. 

 Forening i K0benhavn, 1909, p. 117 (identity); Smiths. Miscell. Coll., vol. 60, No. 10, 1912, 

 p. 2 (identity); Crinoids of the Indian Ocean, 1912, p. 37 (identity). 



Actinometra monobrachius Minchin, Zool. Record for Echinod., 1891, 1892, p. 80 (editorial error). 



Comasler macrobrachius A. H. Clark, Proe. U. S. Nat. Mus., vol. 33, 1908, p. 686 (listed). 



Phanogenia macrobrachivs A. H. Clark, Proc. U. S. Nat. Mus., vol. 35, 1908, p. 124 (listed). 



Capillaster macrobrachius A. H. Clark, Smiths. Miscell. Coll., vol. 60, No. 10, 1912, p. 2 (identity); 

 p. 4 (China Sea; description of the type); Crinoids of the Indian Ocean, 1912, p. 37 (identity); 

 p. 73 (synonymy; record; resemblance to Comantheria briarens); Proc. Biol. Soc. Washington, 

 vol. 26, 1913, p. 178 (range in east Asia); Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, 

 p. 214 (Malayan species; range and its significance); Unstalked Crinoids of the Siboga Exped., 

 1918, p. 9 (in key; range); p. 10 (references; detailed account; station 77); p. 272 (listed); 

 pi. 11, figs. 4, 5. 



Diagnostic features.— -The entire absence of cirri and the reduction of the centro- 

 dorsal to a snaall stellate plate lying within the radial circlet separate this species 



