NO. 1876, ON THE CRUSTACEAN ORDER CUMACEA—CALMAN. 



611 



The peduncle of the uropocls is longer by one-half than the last 

 somite and its inner edge is serrated. The rami are subequal and 

 more than two-thirds as long as the peduncle. The endopod has 



Fig. 4.— Cyclaspis varians, male, from the side. 



the inner edge serrated, with four spines, and has a rather slender 

 apical spine; the exopod has three unequal apical spines. 



Adult male. — Total length, 4.3 mm. 



Differing from the female in the usual characters. The dorsal 

 edge of the carapace is quite smooth. The pseudorostrum is more 

 truncated than in the female and the antennal angle is 

 rounded. 



The peduncle of the uropods is nearly twice as long 

 as the last somite and its inner edge is clothed with 

 plumose hairs. The endopod is less than two-thirds 

 as long as the peduncle and a little shorter than the 

 exopod; it has about ten spines on its inner edge. The 

 exopod has plumose setae on its inner edge. 



The integument in both sexes is rather thin and 

 slightly calcified, and there is a good deal of irregularly 

 distributed pigment, especially in the female. 



Remarries. — The occasional presence of serrations on 

 the dorsal crest gives this species something of the 

 aspect of an Ipliinoe, from which genus, however, it is 

 at once distinguished by the unsegmented endopod 

 of the uropods, the lateral articular processes of the 

 abdominal somites, and other characters. On the other 

 hand it is closely related to some of the members of the 

 genus Cyclaspis. In the key wliich I have given to the 

 species of that genus ^ it would find its place next to C. levis Thomson. 

 From that species it is distinguished by its much smaller size, by the 

 fact that the ocular lobe does not reach to the tip of the pseudo- 

 rostrum, by the presence of an apical spine on the endopod of the 

 uropods, and by a number of other small characters mentioned in the 

 description. 



Fig. 5. — Cyclaspis 

 varians, male, 

 last somite and 



LTROPOD. 



1 Trans. Zool. Soc, vol. IS, pt. 1, 1907, p. 6. 



