188 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



c 1 . Cirri very stout, stouter than in any other species of the genus; the enlarged proximal pinnules 

 have the segments in the basal two-thirds with strongly produced and everted distal edges 



(Maldive Islands) sol (p. 188) 



c 2 . Cirri rather short and weak, without, or with only slight traces of, dorsal processes on the 

 distal segments; the enlarged proximal pinnules have the segments in the middle half with 

 slightly swollen distal edges (from Cochinchina and Philippines south to southern Celebes 



and Kei Islands and eastward to Admiralty Islands; 0-38 meters) magnipinna (p. 189) 



6 2 . Enlarged proximal pinnules with about 20 segments, distally tapering more or less abruptly 



and without a flagellate tip. 



c 1 . Segments of the enlarged proximal pinnules entirely smooth; the distal edges of the com- 

 ponent segments may be swollen, or they may be unmodified, but they are never spinous; 

 distal edges of the proximal brachials smooth, or only very slightly produced (from Philip- 

 pine Islands and Macclesfield Bank southward to Moluccas, Kei Islands, and Great 



Barrier Reef and westward to Ceylon; 0-57 [?66] meters) robustipinna (p. 193) 



e*. Segments of the enlarged proximal pinnules with the distal ends projecting abruptly beyond 

 the bases of the segments succeeding (but not overlapping) and armed with very numerous 

 fine spines (in large specimens on the distal segments only) ; distal ends of the proximal 

 brachials very strongly produced and everted (Singapore and North Borneo; littoral) 



martens! (p. 203) 



a?. Enlarged proximal pinnules slender, flagellate distally, and very long (slightly more than half 

 the length of the cirri) , composed of 36-40 perfectly smooth segments most or all of which are 

 longer than broad; a few of the earlier segments are narrowly, but prominently, carinate; 

 earlier segments of the following pinnules very strongly carinate; segments in the outer half 

 of the cirri with prominent dorsal spines. 



6 1 . Arms 35-61 in number; about 40 cirrus segments; a few of the basal segments in the proximal 

 pinnules are broader than long (from Philippine Islands and Singapore south to Amboina 



and Kei Islands; 0-51 meters) bartschi (p. 209) 



6*. Arms 20-25 in number; about 35 cirrus segments; all the segments in the proximal pinnules 

 are longer than broad (Persian Gulf) persica (p. 212) 



HIMEROMETBA SOL A. H. Clark 



Anledon palmata BELL, in Gardiner, Fauna and geography of the Maldive and Laccadive Archi- 

 pelagoes, vol. 1, pt. 3, 1902, p. 224 (Kolumaduli, Maldives; 38 fathoms). 



Himerometra sol A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 40 (identity of Bell's record), 

 p. 115 (synonymy; detailed description, based on Bell's specimens; locality); Proc. U. S. Nat. 

 Mus., vol. 46, 1913, p. 285 (in key), p. 288 (synonymy; range); Smithsonian Misc. Coll., vol. 

 61, No. 15, 1913, p. 26 (published reference to specimens in B. M.; locality; detailed description 

 of 1 specimen and shorter description of another); Unstalked crinoids of the Siboja-Exped., 

 1918, p. 73 (in key; range); John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936, pp. 

 99 (range), 103. 



Diagnostic features. The enlarged proximal pinnules are very stout basally, 

 distally gradually tapering to a delicate and flagellate tip; they are composed of 

 30-32 segments nearly all of which are broader than long, or at least not longer than 

 broad ; the distal edges of the segments in the middle half or proximal two-thirds are 

 strongly produced and everted, but are always smooth and never spinous; none of 

 the segments of the proximal pinnules are carinate, and the following pinnules are 

 without carinate processes on the earlier segments. The cirri are very stout, stouter 

 than those in any other species of the genus, 25-30 mm. in length, with 25-30 seg- 

 ments, of which the outermost 10-12 have a small and low dorsal tubercle. The 

 41-51 arms are 140 mm. long. 



Description. The centrodorsal is thick discoidal, with a strongly concave dorsal 

 pole 4 mm. in diameter. 



