132 RECENT UNSTALKED CRINOIDS 
The centrodorsal is very low hemispherical, the bare 
polar area almost covered with pits representing obsolete 
cirrus sockets. 
The cirri are XXX, 10—12, 8 mm. to 9 mm. long, 
strongly curved; the first segment is very short, the second 
about twice as Jong as the median diameter, the third 
about three times as long as the median diameter, the 
fourth about the same length as the third; the following - 
gradually decrease so that the antepenultimate is slightly 
longer than broad and the penultimate about as long as 
broad; the second and third are strongly constricted cen- 
trally with expanded ends, the following gradually losing 
this character and becoming laterally flattened and hence 
broader in lateral view, the outer segments being nearly 
or quite twice the lateral diameter of the proximal; there 
are no dorsal processes; the opposing spine is large and 
prominent, triangular, arising from the entire dorsal surface 
of the penultimate segment and directed obliquely forward. 
The radials are even with the edge of the centrodorsal; 
the IBr, are short, almost entirely divided in the median 
line by a posterior process from the axillary, well separated 
laterally and not in basal contact; the axillaries are about 
as broad as long, widely separated laterally, with all the 
sides concave. 
The ten arms, which are 45 mm. long, resemble those 
of C. serrata, but the edges of the brachials, while over- 
Japping and projecting, are much less conspicuously spinous 
and lack the strong longitudinal ridges running inward 
from each spinous process. 
P, is 8.5 mm. long with seventeen or eighteen seg- 
ments, moderately slender; the first ‘two segments are 
broader than long, the third is about twice as long as the 
median diameter, the remainder approximately three times 
as long as broad, becoming somewhat longer distally; the 
third and following have slightly projecting and over- 
lapping very finely spinous distal edges, this character 
gradually increasing in intensity distally; P, is 4 mm. 
Notes from the Leyden Museum, Vol. XXXIV. 
