154 RECENT UNSTALKED CRINOIDS 
dorsal is undifferentiated and smooth, there being no raised 
rims about the cirrus-sockets; each cirrus-socket bears on 
either side just above the center a half-conical ridge with 
the apex inward and lying at the central canal. 
The cirri are XXX, 19—20, about 13 mm. long; the 
first two segments are about twice as broad as long, the 
third is about as broad as long or slightly broader than 
long, the fourth is twice as long as the diameter of the 
ends; the fifth is nearly or quite three times as long as 
the proximal or distal lateral diameter, the sixth is slightly 
shorter, and the following gradually decrease in length so 
that the fourteenth and following are only slightly longer 
than broad; the fourth-seventh are moderately constricted 
centrally with prominent ends, this feature disappearing 
in the next two or three and the cirrus coincidently be- 
coming strongly compressed laterally; the opposing spine 
is terminal, small and blunt; the terminal claw is slightly 
longer than the penultimate segment, rather stout, evenly 
tapering and evenly curved. 
The basals are very large, broadly seven sided, in lateral 
contact for a distance equal to about half the greatest 
(median) length; the proximal edge, adjoining the rounded 
interradial ridges of the centrodorsal, is slightly concave; 
the two adjoining proximal edges are of about the same 
length, but straight; they meet in the midradial line in a 
broadly obtuse angle; the anterior angle of the basals is 
broadly obtuse, and is the same as the midradial angle 
made by the proximal edges of adjacent basals over the 
proximal edge of the centrodorsal; the lateral edges of the 
basal ring are parallel so that the basal ring continues 
the column made by the columnar basal third of the 
centrodorsal. 
The radials are slightly broader than long, in lateral 
contact throughout their entire length, the interradial angles 
somewhat produced proximally, slightly rounded dorsally, 
this greatly increasing distally so that at the distal portion 
of the interradial area there is a well marked interradial 
Notes from the Leyden Museum, Vol. XXXIV. 
