594 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



{ = Adinometra parvicirra, part, of P. H. Carpenter, 1888); p. 37 { = Aclinomclra parvicirra, 

 in part, of Hartlaub, 1891); p. 95 (synonymy; Invisible Banlc; description; summary of pre- 

 vious records; comparison with parvicirra); Die Fauna Siidwest-Australiens, vol. 4, Lief. 6, 

 1913, p. 309 (Abrolhos Is.; description; also Samoa, Tonga, Fiji, New Caledonia, Sulu, and 

 Ruk); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, p. 17 (Samoa; no locality; characters of 

 one of the specimens); Records of the Western Australian Mus., vol. 1, pt. 3, 1914, p. 113 

 (already recorded from Abrolhos); Internat. Revue d. gesamt. Hydrobiol. u. Hydrogr., 1915, 

 p. 223 and following (detailed account of the distribution in Australia) ; Unstalked Crinoids 

 of the Siboga Exped., 1918, p. 49 (in key; range); pp. 271, 273, 275 (listed).— H. L. Clark, 

 The Echinoderm Fauna of Torres Strait, 1921, p. 8 (secured by the Carnegie Exped., 1913); 

 p. 19 (Mer; Badu; range); pp. 192 and following (range); pi. 20, fig. 4. 



Comanthus {Benneltia) samoana A. H. Clark, Records of the Australian Mus., vol. 9, No. 1, 1912, 

 p. 82 (Ugi, Solomon Is.). 



Comanthus parvicirra (part), A. H. Clark, Smiths. Miscell. Coll., vol. 60, No. 10, 1912, p. 10 

 (Peru). 



Comanthus luteofuscum H. L. Clark, Carnegie Institution of Washington Publication 212, 1915, 

 p. 102 (Mer; description). — A. H. Clark, Unstalked Crinoids of the Siboga Exped., 1918, 

 p. 56 (synonym of parvicirra) . 



Comanthus samoanum H. L. Clark, Carnegie Institution of Washington Publication 212, 1915, 

 p. 103 (Mer); Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 84 (Ceylon; notes); p. 93 (occurs at 

 Ceylon). 



Comanthus (Cenolia) samoa7ia A. H. Clark, Unstalked Crinoids of the Siboga Exped., 1918, p. 52 

 (references; stations 50, 162, 299; notes). 



Comanthus luteofusca H. L. Clark, The Echinoderm Fauna of Torres Strait, 1921, p. 8 (secured 

 by the Carnegie Exped., 1913); p- 18 (occurrence at Mer; probably the same as samoana; 

 discussion; color); p. 192 and following (range); pi. 20, figs. 2, 3; Journ. Linn. Soc. (Zool.), 

 vol. 35, 1923, p. 234. 



Diagnostic features. — The cirri are numerous, rather short, but strong and rather 

 stout, and strongly recurved in the distal portion. They are usually about XX 

 (varying from XI to XXVI), 15 (12-17), 9 or 10 mm. (from 8 to 12 mm.) in length. 



The arms are usually 20, or about 20 (varying from 15 to 39), in number, and 

 usually between 60 and 70 mm. (varying from 40 to 105 mm.) in length. 



There is an excessive development of minute spines on the distal edges of the 

 brachials and pinnule segments which gives this species, especially when preserved 

 in alcohol, a characteristic "dry" feeling which is quite different from the "soft" 

 feeling of C. parvicirra. 



The following description is based upon the type and cotypes collected by Sir 

 Charles N. E. EUot in Samoa: 



Description. — The centrodorsal is small, discoidal, with the bare polar area flat, 

 from 2 to 3 mm. in diameter. The cirrus sockets are arranged in a single more or 

 less irregidar marginal row. 



The cirri are XVIII-XXIII, 12-15 (usually 13-14), 10 mm. long, short, but 

 comparatively stout, and always strongly curved. The first 2 segments are about 

 twice as broad as long, the third is about as long as broad, the fourth and fifth are 

 about twice as long as broad, the sixth is about as long as broad, and the remainder 

 are about one-third again as broad as long. The fifth and following segments have 

 the distal dorsal edge somewhat thickened, this thickening gradually narrowing 

 distally and increasing slightly in height, appearing in lateral view as a slight sub- 

 terminal tubercle. The opposing spine is median or submedian, low, with the apex 

 sharp in lateral view, but in end view transversely elongate or double. The terminal 



