156 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



brachials. But I have had much difficulty in determining the nature of the union between the two 

 outer radials and the two distichals respectively; and after repeated changes of opinion, I have 

 come to the conclusion that there is a bifascial articulation in each case. The specific formula thus 

 becomes the same as that of Actinometra pulchella, and in the absence of better preserved material 

 it has seemed best to refer the individual in question to this protean species. The eastern form 

 has fewer cirrus-joints, with larger and blunter spines than may occur in the Caribbean type; and 

 the characters of the lower pinnules do not seem to be quite the same in the two cases. But I have 

 been unable to make out any differences which would serve to separate the two forms specifically, 

 though it is quite possible that they may reveal themselves when better preserved material is 

 examined. On the other hand, there is no a priori reason why Actinow.eira pulchella, which occurs 

 on both sides of the Atlantic, should not also inhabit the Eastern Seas. * * * 



On the whole, then, it appears most probable that the specimen obtained by the Challenger 

 in the Arafura Sea really does belong to Actinometra pulchella, though one would like to see a more 

 perfect specimen before definitely making such a large addition to the geographical range of the 

 Caribbean type. It is also possible, on the other hand, that we are here dealing with a varietal 

 form of Actinometra maculata from Torres Strait; but I rather doubt this being the case, as its arm 

 joints are relatively longer than those of that type, and the terminal cirrus joints are more com- 

 pressed laterally. 



Genus CAPILLASTER A. H. Clark 



Asterias (part) LINNE, Syst. Nat., ed. 10, vol. 2, 1758, p. 663. 



Asterias (Ophiura) OKEN, Lehrb. d. Naturgesch., 3 Thiel, 1815, p. 356. 



Comatula (part) LAMARCK, Hist. nat. des animaux sans vertebres, vol 2, 1816, pp. 533, 534. 



Alecto (part) J. MULLER, Monatsber. d. k. preuss. Akad. d. Wiss., 1841, p. 185. 



Comatula (Alecto) (part) J. MULLBR, Abhandl. d. k. preuss. Akad. d. Wiss., 1847, 1849, p. 261. 



Actinometra (part) DTJJARDIN and HUPE, Hist. nat. des zoophytes, Echinodermes, 1862, p. 210. 



Antedon (part) LUTKEN, Vidensk. Meddel., 1871, p. 273. 



Comatula (Actinometra) (part) GRDBE, Jahresber. d. schles. Gesellsch. f. vaterl. Cultur, vol. 53, 

 1875, p. 75. 



Comaster (part) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1908, p. 686. 



Phanogenia (part) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 35, 1908, p. 124. 



Capillaster A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 87 (characters; genotype 

 Actinometra sentosa P. H. Carpenter, 1888); Proc. U. S. Nat. Mus., vol. 36, 1909, p. 503 (syn- 

 onymy; genotype; range); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 150 (arm division 

 compared with that of Hypalocrinus liliaceus); p. 175 (referred to the Capillasterinae) ; Vi- 

 densk. Medd. fra den naturhist. Forening i K0benhavn, 1909, p. 121 (multibrachiate when 

 very small; individuals of this genus and Nemaster are more solitary than are those of other 

 genera of Comasteridae) ; Proc. U. S. Nat. Mus., vol. 40, 1911, p. 10 (represented in the 

 West Indies by Nemaster); p. 13 (common to southeast Africa and Ceylon, but not occurring 

 in the Arabian Sea); Ann. and Mag. Nat. Hist., ser. 8, vol. 7, 1911, p. 644 (Comissia falls in 

 the same subfamily); Memoirs Australian Mus., vol. 4, pt. 15, 1911, p. 735 (1 species in Aus- 

 tralia); p. 736 (original reference; characters; range; represented in the West Indies by 

 Nemaster); Proc. U. S. Nat. Mus., vol. 43, 1912, p. 390 (relation to Nemaster, Neocomatella, 

 and Comatella); Crinoids of the Indian Ocean, 1912, p. 11 (represented in the Ceylon region 

 which is the western limit of the large and highly multibrachiate species); p. 12 (represented 

 in the southeast African region) ; p. 13 (corresponds to the West Indian Nemaster) ; p. 20 

 (bathymetric range); p. 55 (in key); p. 73 (original reference; type); Internat. Revue d. 

 gesamt. Hydrobiol. u. Hydrogr., 1914, pp. 3 and following (represents the Atlantic Nemaster); 

 Beitrage zur Kenntnis d. Meeresfauna Westafrikas, Echin. II, Crinoidea, 1914, p. 309 (same); 

 Die Crinoiden der Antarktis, 1915, p. 181 (range; represented in the Atlantic by Nemaster); 

 American Naturalist, vol. 49, 1915, p. 525 (bathymetric range); p. 539 (asymmetrical disk; 

 1 or more rays dwarfed). F. W. CLARKE and WHEELER, U. S. Geol. Survey Professional 

 Paper 90-L, 1915, p. 195 (inorganic constitutents of the skeleton); Professional Paper 102, 



1917, pp. 23 and following (same).- A. H. CLARK Unstalked Crinoids of the Siboga Exped., 



1918, p. 2 (in key); p. 9 (key to the included species). GISLEN, Nova Acta reg. Soc. sci. 



