OF THE SIBOGA-EXPEDITION. Bt, 
with eleven segments, much smaller and more slender than 
P,; the first two segments are short, the third is half 
again as long as broad, and the following rapidly become 
elongated; the segments have moderately produced and 
overlapping spinous distal edges; P, is 3 mm. to 4.5 mm. 
long with about eleven segments, tapering less rapidly 
than P, and stouter, especially distally; P, is similar to 
P, but is slightly longer and stouter; the distal pinnules 
are 7 mm. long, very slender, with sixteen or seventeen 
segments which have slightly spinous distal ends. 
Type locality. — »Siboga” Station N°. 144. 
Compsometra parviflora, sp. nov. 
The cirri have 8—9 (usually 8) segments and are 4 mm. 
long; the first segment is about twice as broad as long, 
the second two to two and one half times as long as the 
expanded distal end, the third and fourth are the longest, 
about three times as long as the expanded distal ends; 
the following slowly decrease in length so that the ante- 
penultimate is about twice as long as the diameter of its 
expanded end and the penultimate is from one third to 
one half again as long as broad; the longer proximal 
segments are constricted centrally with prominent ends, 
this gradually decreasing in amount as the segments become 
shorter distally; the opposing spine is terminal, prominent, 
in length equal to nearly one half the distal diameter of 
the penultimate segment. 
The radials are even with the edge of the centrodorsal, 
and are slightly separated at their distal angles; the IBr, 
are half as long in the median line as laterally, about 
three times as broad as the lateral length; the lateral 
edges converge slightly so that the adjacent IBr, are 
widely separated; the lateral portion of the proximal and 
distal edges is sometimes slightly thickened; the axillaries 
are rhombic, the lateral angles truncated, twice as broad 
as long, widely separated laterally. 
Notes from the Leyden Museum, Vol. XXXIV. 
