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 setae. 



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 3 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, 4 5 , 

 2 $ ; off Point Conception, California, 278 fathoms, station 3198 (type 

 locality), i 5 {Albatross). 



Closely allied to C. cacigena 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. ccecigena, 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. 



