NO. 1U91. .SEVENTEEN NEW SPECIES OF CRIN0ID8— CLARK. 637 



Cirri XVIII-XXIII, 31-35, 23 mm. to 25 mm. long; first joint 

 very sliort, the next three nearly two and one-half times as broad as 

 long, the following gradually increasing in length to the sixth or 

 seventh, which is about as long as broad; next five to seven joints 

 usually slightly longer than broad (sometimes squarish), the follow- 

 ing gradually decreasing in length, the terminal fifteen or rather 

 uiore being half again to twice as broad as long; at about the fifteenth 

 joint dorsal tubercles are devdoped, at first involving only the distal 

 l)ortion of the dorsal surface, later arising in a slightly convex line 

 from near the proximal end, the apex being subterminal ; these tuber- 

 cles are narrow, laterally occupying only a small portion of the 

 median part of each joint, and are slightly rounded dorsally; on the 

 last three joints the tubercles become somewhat sharper, more erect, 

 and move to a median position; opposing spine small (though larger 

 than the tubercle on the preceding joint), blunt, arising from the 

 entire dorsal surface of the joint, the apex median or submedian in 

 position, in height equal to about one-third the diameter of the penul- 

 timate joint; terminal claw somewhat longer than the penultimate 

 joint, rather stout and strongly curved. 



Ends of the basal rays and radials concealed ; IBr^ very short and 

 band-like; IBr^ (a:^illary) short, almost triangular, two and one-half 

 times as broad as long; IIBr 4(3+4), in apposition laterally, though 

 not laterally flattened; IIBr^ entirely united interiorly; IIlBr 2, 

 rarely 4(3+4) ; IVBr 2, but rarely present. 



Sixteen to twenty-five arms 110 mm. long; first two brachials 

 wedge-shaj)ed, three times as broad as long exteriorly, the first in- 

 teriorly united; following four or five brachials oblong, about four 

 times as broad as long, then gradually becoming wedge-shaped, almost 

 triangular, about three times as broad as long, and less oblique and 

 somewhat longer on the outer portion of the arms. The dorsal sur- 

 face of the arms is perfectly smooth. Syzygies occur between the 

 third and fourth brachials, again between the thirteenth and four- 

 teenth to twentieth and twenty-first (usually in the vicinity of the 

 fifteenth) and distally at intervals of seven to eleven (most commonly 

 eight or nine) oblique muscular articulations. 



Pd ''^•5 nnn. long, moderately stout basally, but tapering rather 

 rapidly in the proximal half and slender distally, with twenty-five 

 joints, at first twice as broad as long, becoming squarish after the 

 tenth; the first four joints are strongly carinate, this carination de- 

 creasing from this point onward and disapi)earing after the middle 

 of the pinnule; P^ 13 mm. long, slightly stouter than Pd basally, 

 tapering gradually, and becoming slender in its distal third, with 

 twenty-six joints, at first twice as broad as long, becoming squarish 

 after the ninth and somewhat longer than broad in the terminal por- 

 tion ; the first seven or eight joints are rather strongly carinate and in 



