A MONOGRAPH OF THE EXISTING CRINOIDS 43 



KEY TO THE SPECIES IN THE GENUS COSMIOMETRA 



a 1 . Arms 23-28 in number, the IIIBr series always on the outer side of the IIBr series; cirri with 



31-40 segments, 30-35 mm. long; arms 90-110 mm. long. 



ft 1 . Cirri in 15 columns on the cenlrodorsal; transition segment about the eighth; stout; carination 

 of the brachials high, narrow, and conspicuous (from south of Ceylon to the Maldive Islands; 



199-241 meters) leilae (p. 43) 



b 1 . Cirri in 10 columns on the centrodorsal; transition segment about the sixteenth; slender; carina- 



tioii of the brachials low and inconspicuous (Hawaiian Islands; 583 meters) delicata (p. 46) 



a*. Arms 20 (or slightly less) in number; no IIIBr series. 

 6 1 . Longest cirri with more than 50 segments. 



e 1 . Elements of the division series and lower brachials with the lateral portions more or less ex- 

 tensively roughened or finely spinous. 



d l . Cirri with 68-74 segments, half as long as the arms or somewhat longer; cirri 45-50 

 mm. long, arms about 90 mm. long (Bass Strait, between Australia and Tasmania; 



128-183 meters) dasybrachia (p. 47) 



d 1 . Cirri with less than 65 (usually 40-55) segments, less than half as long as the arms; arms 



100-130 mm. in length. 



e 1 . Edges of the elements of the division series and first two brachials everted and roughened; 

 cirri arranged in 15 closely crowded columns on the centrodorsal (Sagami Bay, Japan; 



183-730 [7740] meters) aster (p. 49) 



e'. All but the median third of the dorsal surface of the elements of the division series and 

 first two brachials finely spinous or tubercular; cirri arranged in 10 definite columns 

 2 in each radial area, on a conical centrodorsal (Philippines to Celebes and the Kei 



Islands; 245-621 meters) philippinensis (p. 52) 



c'. Elements of the division series and lower brachials with the lateral borders and the proximal 



and distal edges smooth, without spines. 



d 1 . Cirri with about 70 segments, slightly over half as long as the arms, arranged in 10 

 columns on the centrodorsal; cirri 45 mm. long, arms about 70 mm. long (southern 



Japan) conifera (p. 56) 



d 1 . Cirri with 50-54 segments, about one-third of the arm length, irregularly arranged in 

 from one to three columns in each radial area of the centrodorsal; cirri 45 mm. long, 



arms 130 mm. long (Hawaiian Islands; 249 meters) crassicirra (p. 58) 



V. Cirri with not more than 41 segments. 



c 1 . Carination of the division series and first two brachials broad and low; outer brachials 

 very strongly overlapping and broadly carinate; cirri slender (Saya de Malha; 247 



meters) gardineri (p. 63) 



e*. Carination of the division series and first two brachials narrow and higher; outer brachials 



moderately overlapping and narrowly carinate; cirri stouter. 

 d 1 . Division series and first two brachials with the lateral edges not produced (Sahul 



Bank) woodmasoni (p. 60) 



d 1 . Division series and first two brachials with the lateral edges produced and slightly 

 everted, broadly scalloped or bearing two or three blunt tubercles (off southwestern 

 Mindanao; 292-365 meters).-- iole (p. 61) 



COSMIOMETRA LEILAE A. H. Clark 



PLATE 5, FIGURE 17; PLATE 6, FIGURE 23 



Cosmiometra leilae A. H. CLARK, Rec. Indian Mus., vol. 34, pt. 4, 1932, p. 551 (listed), p. 565 (Investi- 

 gator station 465; description; comparisons), pi. 20, figs. 18-19; John Murray Exped. 1933-34, 

 Sci. Reports, vol. 4, No. 4, 1936 (Jan. 1937), p. 87 (listed), p. 92 (Mabahi.t station 157; notes; 

 range), pp. 101, 103. 



Diagnostic features. This is a stout and robust species with 23-28 arms; and the 

 cirri, which are relatively stout and rather short and have the transition segment at 

 about the eighth, are arranged in 15 columns on the large ccntrodorsal. The arms are 

 90-100+ mm. long, and the cirri are 30-35 mm. long with 3110 segments. 



