18 DE. W. T. CALMAN ON KEW OE EAEE 



broad, and reaches nearly to the tip of the pseudorostrum. There are about nine 

 corneal facets, but the eye is without pigment. 



The first leg-bearing somite is only visible at the sides. The second has the dorsal 

 crest produced upwards into an acute tooth curving slightly forwards at the tip. The 

 posterior thoracic and the anterior abdominal somites have a median dorsal keel 

 becoming fainter posteriorly. 



The antenuules have the third segment of the peduncle longer than the preceding, 

 and the inner flagellum represented by a minute vestige. The antennae have the outer 

 process sliort and distinctly segmented off from the basal part. The mouth-parts 

 resemble very closely those of C. elegans. The first legs extend well beyond the tip of 

 the pseudorostrum in the natural position. The basis exceeds only by about one- 

 fifth the combined length of the distal segments. The terminal segment is equal in 

 length to the preceding. The remaining legs are similar to those of C. elegans. 



The peduncle of the uropods is a little longer than the last somite and bears five 

 plumose setse on its inner edge. The rami are subequal and are about equal in length 

 to the peduncle. The endopod has the inner edge serrated and carrying a single 

 small seta near the tip. The exopod has a slender apical spine and several plumose 

 setffi on its inner edge. 



Adult Male. — Total length 4-16 mm. 



The carapace is less deep than in the female and more compressed. The tooth at 

 the posterior end of the dorsal crest is low and rounded. The oblique ridges on the 

 sides of the carapace are similar in position to those of the female, but less strongly 

 marked and do not meet above. The antennal notch is more widely open and the 

 tooth defining it is more obtuse than in the female. 



The first leg-bearing somite is hidden. The second is produced dorsally into an 

 acute forwardly curved tooth, more slender than that of the female. 



The first legs have the basis longer by one-half than the distal segments 

 together. 



The uropods do not difier in their proportions from those of the female, but the 

 seta; on the inner edge of the peduncle are much more numerous and the inner edge of 

 the endopod is also fringed with setae. 



Bemarks. — This species resembles C. histriata Zimmer (Zool. Jahrb., Abth. Syst. xvii. 

 p. 447, 1902), but appears to differ in the outline of the carapace, which has the dorsal 

 edge less curvtd, in the position of the lateral ridges, and in the longer peduncle of 

 the uropods, which in the species named is shorter than the rami. Except for the 

 absence of the lateral ridges of the carapace, Zimmer's figure of the male C. argus 

 (J. c. p. 445, fig. A) resembles very closely the male of the present species. Without 

 a re-examination of the type specimens it seems impossible to decide whether one or 

 both of these species may not be identical with that here described. 



