No. 1685. REVISION OF CRINOID FAMILY COMASTERIDM— CLARK. 499 



penultimate squari.sh or not (piite so long as broad; second to sixth 

 joints slender, moderately constricted centrally ("dice-box shaped "), 

 with prominent articulations, rounded in cross-section, then becom- 

 ing rather strongly compressed laterally (the distal portion of the 

 cirrus therefore becoming broader in lateral view) and less and less 

 "dice-box shaped;'' transition and following joints with a small, 

 though prominent, sharp subterminal dorsal spine; opposing spine 

 slightly marked, median, arising from the entire dorsal surface of 

 the penultinuite joint ; terminal claw somewhat longer than the 

 penultimate joint (about as long as the antepenultimate), moderately 

 stout, and moderately curved, the curvature being strongest in the 

 basal portion. 



Ends of the basal rays visible as rather prominent tubercles in the 

 angles of the calyx ; radials entirely hidden or slightly visible over 

 the ends of the basal rays, separated distally ; IBr^ short, nearly four 

 times as broad as long, the proximal edge convex, not in contact 

 basally, rounded and widely free laterally, the sides of adjacent 

 IBr^ making with each other an angle of about 90°; IBr, (ax) 

 triangular, the anterior angle somewhat produced, about one and one- 

 half times as broad as long, the very short lateral edges making an 

 obtuse angle with those of the IBr^. 



Ten arms; first seven brachials aj^proximately oblong, then becom- 

 ing obliquely wedge-shaped, and after the tenth triangular, about 

 as long as broad, and terminally obliquely -wedge-shaped and longer 

 than broad, with somewhat expanded articulations; after about the 

 sixth the brachials develop strongly produced and overlapping distal 

 ends. Syzygies occur between the third and fourth brachials, again 

 between the tenth and eleventh to twelfth and thirteenth, and distally 

 at intervals of three oblique nuiscular articulations. 



Disk naked ; mouth and anal tube about equally eccentric. 



Pi the stoutest, and much the longest, evenly tapering to a flagellate 

 tip; Po considerably shorter and much more slender than P^,; P3 

 not much more than one-third, P^ one-third the length of P^; fol- 

 lowing pinnules increasing slowly in length, the distal being nearly 

 as long as P^, with elongated joints which have expanded articula- 

 tions, and spinous distal ends. 



Distrihution. — Caribbean coast of Central America, Gulf of Mex- 

 ico, and northern coast of Cuba. 



Depth. — Forty-two to 163 fathoms. 



LEPTONEMASTER VENUSTUS, new species. 



Centro-dorsal a thin flat disk, the small cirrus sockets arranged in 

 a single crowded marginal row, usually five to each radial area. 



Cirri XV-XX, 12-15 (most commonly 13 or 14) 10 mm. long, as 

 described above. 



