CUMACEA FROM THE COPENHAGEN MUSEUM. 19 



Occurrence. — "Lyttleton Harbour, New Zealand, 1-5 fathoms, H. Suter Coll." 

 Numerous specimens. Copenhagen Museum. Co-types in British Museum. 



Cyclaspis triplicata, sp. n. (Plate III. figs. 16-24.) 



Description of adult Female. — Total length 4*0 mm. 



Very similar in general form to C. hiplicata. The carapace is more inflated poste- 

 riorly. The two oblique ridges on the side of the carapace have much the same course 

 as in that species, but are much more prominent, while in front of these is a prominent 

 tubercle occupying about the position of the anterior upper tubercle in C. elegans, from 

 which a third nearly vertical ridge runs downwards and joins a prolongation of the 

 anterior oblique ridge which turns horizontally forwards to the anterior lower edge of 

 the carapace. The tooth at the posterior end of the dorsal keel is slightly diflferent in 

 shape from that of C. hiplicata and has the hinder edge finely serrated. 



The dorsal crest of the second leg-bearing somite differs from that of C. hiplicata in 

 having the upper angle blunt, the oblique dorsal edge sinuous, and the posterior angle 

 prominent and overhanging the third somite. The median dorsal keel is very slightly 

 marked on the posterior thoracic and anterior abdominal somites, but a pair of dorso- 

 lateral keels, not seen in C. hiplicata, are developed on the last two thoracic and the 

 first three abdominal somites. 



The antennules have the third segment of the peduncle a little shorter and stouter 

 than in C. hiplicata. 



The first legs are shorter than in C. hiplicata. The basis exceeds by one-half 

 the combined length of the distal segments. The posterior legs have longer and more 

 numerous setse. 



The uropods are similar to those of C. hiplicata, but are a little stouter. 



Adult Male. — Total length 4-0 mm. 



The male closely resembles that of G. hiplicata, from which, however, it is at once 

 distinguished by the presence of the additional anterior ridge on the carapace. As in 

 the female, this ridge rises above into a blunt tubercle, which is very conspicuous when 

 the carapace is viewed from above. In this species, moreover, the last two thoracic 

 and the first abdominal somites bear strongly marked dorso-lateral ridges, the dorsal 

 tooth of the second leg-bearing somite is shorter and more curved, and the first legs 

 are rather shorter than in C. hiplicata. 



RemarJcs. — Both in general aspect and in the details of its appendages this species 

 resembles very closely that last described, in company with which it occurred. 



Occurrence. — " Lyttleton Harbour, New Zealand, 1-5 fathoms, H. Suter Coll." 

 Many specimens. Copenhagen Museum. Co-types in British Museum. 



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