156 RATHBUN 
long as the third. Those of the second pair are a little longer than the 
carapace, and end in a short, broad compressed hand, the edges and 
outer surface of which are setose, as are also the lower border of the 
merus and the upper and distal borders of the carpus. The dactyli of 
the remaining pairs are almost hidden in sete. 
The first of the abdominal somites is the shortest, and is one half the 
length of the second, which is the longest. The lateral margins of the 
first are rounded and upturned. The second is half as long as the cara- 
pace; its angles are rounded, the anterior pair being carinated; the third 
and fourth somites have rounded margins, the posterior angles being 
setose; the fifth somite has dentiform posterior angles; the sixth has a 
lateral spine in front of the middle, pointing down and back; this somite 
is a little longer than wide, exclusive of the spines. The telson is nearly 
as long as the sixth somite; its sides are subparallel, notched at the 
anterior third; posterior angles rounded; the caudal swimmerets are 
broad and rounded, the outer much the larger. The first abdominal 
appendage in the @ is slender and forked, the outer branch filiform, the 
inner very short, truncate, and fringed with long hair. The second to 
fifth pairs are very broad, foliaceous; in the second, the outer branch is 
very much larger than the inner; in the third, fourth, and fifth the two 
branches are subequal; in each case the inner edge of the endopodite 
bears near its middle a small styliform appendage. In the ¢ the ter- 
minal joint of the first abdominal appendage is somewhat scythe-shaped, 
with a lobe at the inner base of the scythe. The third to fifth pairs are 
similar to those of the @? ; the second pair is much smaller, branches 
subequal, inner styliform appendage larger and fringed with hair toward 
the extremity. 
Dimensions.—Male, station 3198, length of carapace 30.5 mm., of 
abdomen 67.5 mm.; female, station 3077, length of carapace 22.2 mm., 
of abdomen 52 mm. 
Distribution.—Clarence Strait, Alaska, 322 fathoms, station 3077, 42, 
2 @; off Point Conception, California, 278 fathoms, station 3198 (type 
locality), 1 4 (Albatross). 
Closely allied to C. cecigena Alcock and Anderson, but differs in the 
shorter rostrum, in the absence of spines on the second to fifth somites 
of the abdomen, in the squarer telson. The shape of the first pair of 
chelipeds is the same as in C. ce@cigena, but the carpus of the larger one 
is without a spine, the palm is not serrated on its lower margin, its outer 
surface is furnished with tubercles on the distal lower quarter, to which 
also the hairs are restricted; the pollex is shorter in our species and its 
tooth is nearer the middle. 
