OF THE SIBOGA-EXPEDITION. 135 
are nearly or quite four times as long as the distal diameter 
becoming somewhat longer terminally; the earlier segments 
are strongly constricted with expanded distal ends, this 
feature gradually decreasing after the eighth; after the tenth 
the cirrus gradually tapers to a point. 
The radials are even with the edge of the centrodorsal, 
their distal border sometimes with a few tubercles toward 
the inner angles; the IBr, are twice as long laterally 
as in the median line, about four times as long as the 
lateral length; the proximal and distal edges are broadly 
thickened, the proximal more broadly than the distal, and 
very finely spinous; the lateral edges are parallel, and are 
excavated by a rounded notch due to the thickening of 
the proximal and distal edges; the axillaries are half again 
as broad as long, rhombic, the lateral angles produced 
slightly outward and downward in a rounded latero-posterior 
process; all the edges are slightly everted and very finely 
spinous. 
The ten arms are from 30 mm. to 40 mm. long, ex- 
ceedingly slender; the brachials are practically smooth with 
no production of the distal edges, 
P, is 3.5 mm. long with nine or ten segments of 
which the first is broader than long, the second slightly 
longer than broad, the third twice as long as broad, and 
the following greatly elongated; the third and following 
have slightly and evenly everted finely spinous distal ends; 
the pinnule becomes very slender after the first three 
segments; P, is 1.7 mm. long with seven segments, 
much smaller and weaker than P,; P, is similar to 
P,, but is slightly smaller; there is a very slight pro- 
duction of the distal dorsal edges of the component seg- 
ments of these pinnules; the distal pinnules are from 3.5 mm. 
to 4 mm. long, and are extremely slender. 
Type locality. — »Siboga” Station N°. 167, 
Compsometra gracilipes, sp. nov. 
The centrodorsal is very low rounded conical, the dorsal 
Notes from the Leyden Museum, Vol. XXXIV. 
