504 PROCEEDINGS OF THE NATIONAL MXJ8EVM. vol. xxxvi. 



Depth. — Littoral, and down to 194 fathoms. 



Diagnosis. — In general same as Capillaster; IIBr 4 (3+4) ; IIIBr 

 3 (2+3), or irregular; brachials at first oblong, then triangular, 

 about as long as broad, wedge shaped and longer terminally; ter- 

 minal comb usually repeated on inner side of proximal pinnules ; side 

 plates developed along the ambulacra. 



NEMASTER GRANDIS, new species. 



Centro-dorsal thick-cliscoidal, the polar area 5 mm. in diameter, 

 deeply concave; cirrus sockets marginal, arranged in three closely 

 crowded alternating rows. 



Cirri XXV-XXX, 30-35, about 40 mm. long, large and stout; 

 first joint short, about three times as broad as long; following joints 

 gradually increasing in length to the sixth or eighth, which, with the 

 three folloAving, is squarish, then gradually decreasing, the joints 

 from the twelfth or fifteenth onAvard being about twice as broad as 

 long, but the last two are almost square again; a transition joint 

 occurs between the seventh and the twelfth, proximal to which the 

 joints have a dull, finely pitted surface, distally a highly polished 

 surface, the pits widely scattered or absent, and dorsal projections; 

 transition joint not especiall}' marked ; joints proximal to the transi- 

 tion joint with practically straight sides and no modification of the 

 dorsal distal edge; transition and folloAving joints with the distal 

 dorsal edge projecting as a transverse ridge, coarsely dentate (usually 

 tridentate), the ridge being equal in length (transversely) to about 

 half the diameter of the joints; distally the ridge gradually narrows, 

 becoming bidentate, and in the terminal four to seven joints resolves 

 itself into a single spine, which on the antepenultimate becomes sub- 

 terminal in position ; all the transverse ridges appear as rather promi- 

 nent spines in lateral view ; opposing spine prominent, though short, 

 rather stout, arising from the whole dorsal surface of the penulti- 

 mate joint, about equal in lengih to one-third the diameter of that 

 joint, the apex subterminal or submedian, the distal edge usually 

 making much less of an angle with the transverse diameter of the 

 joint than the proximal, giving the spine the appearance of leaning 

 forward; terminal claw considerably longer than the penultimate 

 joint, stout basally, slender distally, strongly curved proximally, but 

 becoming nearly straight in the distal portion. 



Ends of the basal rays visible as low tubercles in the angles of the 

 calyx, but with difficulty differentiated from the adjacent parts; 

 radials concealed in the median line, but visible as a rather prominent 

 triangle in the angles of the calyx, the apex of which separates the 

 lower corners of the IBr^ ; IBr^ oblong, rounded dorsally and laterally, 

 about three times as broad as long, widely separated laterally; IBr^, 

 (ax) pentagonal, one-third to one-half again as broad as long, the 



