130 RECENT UNSTALKED CRINOIDS 
The cirri are about XXX, 15—17 (usually the latter), 
the longest about 18 mm. long; the first segment is very 
short, the second is one and one half to two times as 
long as the median diameter, the third is from two and 
one half to three times as long as the median diameter; 
the fourth and following are about four times as long as 
the median diameter; after the eighth the segments slowly 
become shorter so that the antepenultimate is little if any 
longer than broad; the penultimate segment is small, wedge- 
shaped, about half the size of the antepenultimate; the 
opposing spine is small, subterminal; the longer earlier 
segments are moderately constricted centrally with ex- 
panded and slightly overlapping ends; the shorter terminal 
segments have straighter dorsal and ventral profiles so that 
in a lateral view the cirri appear to become broader just 
at the tip; there may be a slightly marked transition 
segment at about the eighth. 
The radials are even with the edge of the centrodorsal ; 
the IBr, are very short, strongly incised in the median 
line by a rounded posterior process from the axillaries, about 
half as long in the median line as on the lateral edge 
and about four times as broad as the maximum (lateral) 
length; the lateral edges are just in apposition basally, but 
diverge from each other at an obtuse angle of about 120°; 
the lateral edges are concave; the axillaries are slightly 
broader than long, very widely separated, the lateral edges 
about as long as those of the IBr,, diverging at ap- 
proximately a right angle to each other; the anterior sides 
are approximately at right angles to each other, and are 
nearly straight; the anterior angle is only very slightly 
produced; there is a rounded median posterior process 
incising the [Br,. 
The ten arms resemble those of Antedon mediterranea; 
the first brachial is very short, twice as long exteriorly as 
interiorly, the median length being about the same as the 
internal length; the internal proximal third is united with 
the adjacent first brachial, but the distal two thirds diverge 
INotes from the Leyden Museum, Vol. XXXIV. 
