342 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Actinometra cumingi P. H. CARPENTER, Proc. Zool. Soc. London, 1882, 1883, p. 747 (specific for- 

 mula); Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 301 (Malacca; Port Molle record 

 is Comanthus parvicirra). HAMANN, Bronns Klassen u. Ordnungen des Tier-Reichs, vol. 2, 

 Abt. 3, 1907, p. 1584 (listed). A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 35 (iden- 

 tity). 



Antedon irregularis (part) BELL, Report Zool. Coll. H. M. S. Alert, 1884, p. 161 (Prince of Wales 

 Channel); Proc. Zool. Soc. London, 1894, p. 394 (Baudin I.). 



? Actinometra purpurea BELL, Report Zool. Coll. H. M. S. Alert, 1884, p. 165 (Dundas Strait). A. 

 H. CLARK, Memoirs Australian Mus., vol. 4, pt. 15, 1911, p. 714 (identity). 



? Actinometra pectinata BELL, Report Zool. Coll. H. M. S. Alert, 1884, p. 165 (Dundas Strait). 



Aclinometra, sp. juv. BELL, Report Zool. Coll. H. M. S. Alert, 1884, p. 170 (Dundas Strait; possi- 

 bly purpurea). A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 31 (identity); Smiths. 

 Miscell. Coll., vol. 61, No. 15, 1913, p. 79 (identity). 



Actinometra parvicirra (part) BELL, Proc. Zool. Soc. London, 1894, p. 394 (Bassett-Smith Bank, 9 

 fathoms). A. H. CLARK, Memoirs Australian Mus., vol. 4, pt. 15, 1911, p. 719 (of Bell, 1894= 

 pectinata, in part); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, pp. 10, 77 (same). 



Antedon cumingii PFEFFER, Abhandl. Senck. naturforsch. Gesellsch., vol. 25, 1900, p. 85 (Ternate). 



Comanthus cumingii A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 221 (refers to 

 Philippine specimens recorded under this name); Smiths. Miscell. Coll., vol. 52, pt. 2, 1908, p. 

 207 (Albatross stations 5137, 5142; description). 



Comatula rosularis (B. M., MS.) A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 80 ( = Como- 

 tula pectinata); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, p. 89 (same). 



Actinometra echinoptera (B. M., MS.) A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 80; 

 Smiths. Miscell. Coll., vol. 61, No. 15, 1913, pp. 10, 75 (no locality). 



Comatula (Comatula) pectinata A. H. CLARK, Unstalked Crinoids of the Siboga Exped., 1918, p. 27 

 (in key; range); p. 30 (synonymy; detailed account; stations 49a, 50, 79, 796, 96, 99, 162, 164, 

 273, 282, 285, 294, 299). 



Diagnostic features. The cirri have 10-15 (usually 12-14) segments; they are 

 regularly distributed about the periphery of the centrodorsal. If there are gaps in the 

 row of cirri, these never occur in such a way as to segregate the cirri in the interradial 

 angles. 



The arms may be very broad in the basal half, rapidly tapering distally, or long 

 and slender and evenly and slowly tapering. Not infrequently the posterior arms 

 are short and broad and the anterior slender and elongated. Sometimes the distal 

 portion of the arms is greatly produced and attenuated. 



Specimens from Singapore and Java with slender arms occasionally have 11 or 12 

 arms, the IIBr series being 2 (1+2). But all individuals from the other portions 

 of the range and all broad-armed specimens, have, so far as known, 10 arms only. 



Description of the form with very stout arms from the Philippine Islands. The 

 centrodorsal is thin discoidal, with the moderate or rather small bare polar area 

 flat or very slightly concave. The cirrus sockets are arranged in a single crowded and 

 somewhat irregular marginal row which usually shows more or less extensive gaps 

 where the cirrus sockets have been obliterated, thus indicating a tendency toward a 

 cirrusless condition. 



Cirri XI-XVI, 10-14, from 10 to 13 mm. long. The first segment is very short, 

 and the following gradually increase in length to the fourth, which is about as long as 

 broad. The fifth segment is the longest, from one-third to nearly one-half again as 

 long as broad. The sixth segment is somewhat shorter, and the seventh is about as 

 long as broad. The succeeding segments are subequal, from half again to nearly 



