A MONOGRAPH OF THE EXISTING CRINOIDS 485 



6 2 . Cirri large and robust, in length equal to about one-third of the arm length. 



c 1 . Longest cirrus segments about as long as broad; combs confined to the oral pinnules. 

 d l . Division series broad, nearly or quite in lateral apposition, the component ossicles with 

 smooth distal edges; brachials with the distal edges not noticeably produced; 47-48 



arms (Canton and Fuchow, China) grandicalyx, p. 513. 



d 2 . Division series narrow, strongly convex dorsally, the component ossicles with everted 

 and spinous distal edges; brachials with strongly produced and spinous overlapping 

 distal edges; cirrus segments with more or less overlapping distal ends; 30-08 arms 



(southern Japan and the Bonin Islands; 20-91 meters) imbricata, p. 515. 



c 3 . Longest cirrus segments from one-third to one-half again as long as broad; combs occur at 

 irregular intervals to about the thirtieth pinnule; 30-47 arms (Lesser Sunda, Philippine 

 and Bonin Islands; 54[?27]-89 meters) delicata, p. 521. 



COMANTHERIA POLYCNEMIS (A. H. Clark) 



Plate 56, Figure 162 

 [See also vol. 1, pt. 2, fig. 137 (division series), p. 79] 



Phanogenia typica (part) A. H. CLARK, Smiths. Miscell. Coll. (Quarterly Issue), vol. 52, pt. 2, 1908, 



p. 203 (Albatross station 5139). 

 Comanthus polycncmi*. A. H. CLARK, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 39G (Albatrors stations 



5139, 5147, 5248, 5249 [type locality], 5250, 5251, 5252, 5253, 5254); Zool. Anzciger, vol. 34, 



No. 11-12, 1909, p. 366 (listed); Amer. Journ. Sci., vol. 29, 1910, art. 30, p. 354 (4-rayed 



specimen from the Philippine Is.; anterior ray missing). 

 Comantheria polijcnemin A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 89 (synonymy; range) ; 



Unstalked Crinoids of the Siboga Exped., 1918, p. 43 (in key; range; references; station 99); 



p. 272 (listed). 



Diagnostic features. A very large species with very numerous arms and a small 

 stellate ccntrodorsal. The IIBr series are 4 (3+4) but the succeeding division series 

 are all 2 except the outermost, which are largely or mostly 4 (3+4). 



Description. The centrodorsal varies from pentagonal with concave sides to 

 strongly stellate. Its dorsal surface is even with or depressed somewhat below that 

 of the radials. 



There are no cirri. 



The ends of the basal rays are visible as very small tubercles at the angles of the 

 centrodorsal. 



The radials vary from short, four or five times as broad distally as long, to rather 

 long, twice as broad distally as long, with the proximal border about equal to the 

 median length. The IBr, are about as long as, or slightly longer than, the radials 

 and are in close lateral apposition; their distal border is from four to six times the 

 median length. The IBr 2 (axillaries) are triangular, twice as long as the IBri and 

 twice as broad as long. The IIBr series are 4 (3+4), rarely 2. The IIIBr, IVBr, 

 VBr, and VIBr series (if the last be present) are 2, except that the outermost division 

 series, especially on the outer side of each IIIBr series, are commonly 4 (3 + 4), and 

 a few of the other division series are usually replaced by 4 (3 + 4) series in each speci- 

 men. The IBr 2 (axillaries) are well separated laterally, and all the division series 

 are well rounded dorsally and laterally, being entirely free and somewhat widely 

 separated from each other. 



The arms are 90-160 in number, from 120 to 150 mm. in length, increasing 

 slightly in width to about the twelfth or fourteenth brachials and thence gradually 



