134 RECENT UNSTALKED CRINOIDS 
The ten arms are from 15 mm. to 18 mm. long; the 
brachials have somewhat prominent very finely spinous 
- distal ends. 
P, is 2.3 mm. long with nine or ten segments of 
which the first is twice as broad as long, the second is 
somewhat longer than broad, the third two and one half 
times as long as the proximal diameter, and the following 
three times as long as the proximal diameter; the third 
and following are constricted centrally with expanded and 
overlapping distal ends, which are especially prominent on 
the distal side of the pinnule where they are armed with 
long and prominent spines; P, is about half as long as 
P, with seven segments which are very long with very 
strongly everted spinous dorsal distal ends; it bears a gonad 
on the third-sixth segments; the following pinnules as far 
as P, bear gonads. 
Type locality. — »Siboga” Station N°. 50. 
Compsometra longicirra, sp. nov. 
This species is closest to C. gracilipes, but the cirri are 
longer with more numerous segments, and P, is pro- 
portionately more slender with more elongated segments 
which are fewer in number and possess only a slight 
eversion of the distal ends, 
The centrodorsal is low hemispherical, the dorsal portion 
thickly covered with comparatively large rounded tubercles 
which become smaller toward the small bare dorsal pole; 
the cirrus sockets are arranged in a single irregular 
crowded row. 
The cirri are exceedingly slender, X—XV, 14—16, 11 mm. 
long and straight, with extremely long segments distally ; 
the distal quarter of the cirri tapers to a slender point; 
there is a long straight terminal claw without an opposing 
spine; the first segment is very short, the second nearly 
as long as broad, the third from two and one half to three 
times as long as the expanded distal end; the following 
Notes from the Leyden Museum, Vol. XXXIV. 
