CUMACEA— CALMAN. 



151. 



There is a median dorsal keel on the last thoracic and on all the abdominal 

 somites, but there are no lateral keels. 



First legs with basis longer, by nearly one-fourth, than the distal segments 

 together, propodus longer than carpus, dactylus less than two-thirds as long as 

 propodus. 



Peduncle of uropods longer by one-third than last somite and slightly longer than 

 the rami. Exopod with an apical spine and plumose setae on inner edge. Endopod 

 sharply pointed, serrate on inner edge, with a series of pectinate setae followed by 

 five or six spines. Peduncle with plumose setae on inner edge. 



Fig. 5. — Gy'daspis coelehs, n. sp. Male. A. Side view, x 22. B. Anterior portion of body, from 

 above, x 22. C. First leg. x 45. D. Last somite and uropod. x 4-5. 



The exoskeleton is strongly calcified and, when dried, of a dull white appearance, 

 contr^istiug with the glossy surface of C. thomsoni. 



Remarks. — The oblique ridge on the carapace suggests a comparison of this species 

 with C. thomsoni, from which, however, it is at once separated by the antero-lateral 

 prominences as well as by the slightly diflFerent outline of the carapace and the shorter 

 dactylus of the first legs. The specific name refers to the fact that the males on which 

 the description is based were unaccompanied by females. 



