CUMACEA— CALMAN. 149 



of C. bijylicata and the larger specimens of the present collection, and it leaves little 

 justification for regarding them as belonging to distinct species. 



This conclusion is supported by the characters of the adult males of the present 

 collection. They are a good deal larger than the males of C. hiplicata (total length 

 5 "58 mm. as against 4 "16 mm.); the dorsal outline of the carapace is perhaps a trifle 

 more convex and has certainly a more marked depression at the base of the ocular 

 lobe. The ridges of the carapace are very inconspicuous (even when the specimens 

 are dried) as they are in the holotype of C. argus, where they were originally 

 overlooked altogether (Zimmer, 1913, p. 470); they also seem to be a little further 

 forward than in C. biplicata, although this difference is less than in the females. 

 The dorsal tooth of the second leg-bearing somite is less strongly curved than in 

 C. hiplicata, although it is not so straight as in Zimmer's figure of C. argus (1913, 

 pi. xlvi, fig. 70). 



Zimmer considers it likely that C. argus is the male of C. Ustriata, his observa- 

 tion of the lateral ridges of the carapace excluding the possibility of its being paired 

 with C. pusilla as Stebbing has suggested (1913, p. 33); but Zimmer is inclined 

 to uphold my separation of C. hiplicata, a view which, after study of the " Terra 

 Nova " specimens, I can no longer maintain. 



16. Cyclaspis levis, G. M. Thomson. 



C. levis, G. M. Thomson, 1892, p. 264, pis. xvi and xvii ; Caiman, 1907b, p. 8, pi. v, figs. 6-8. 



Occurrence. — Station 133. Spirits Bay, near North Cape, New Zealand. 

 Plankton, 20 metres depth. Eight females, one male. 



Remarks. — The specimens recorded under this name differ in some small 

 characters from those described in my former paper. The adult females are somewhat 

 smaller (total length 6 '32 mm.), the exoskeleton is less strongly calcified and more 

 transparent, and the pitting of the surface of the carapace less distinct. The frontal 

 region is slightly more produced, with a more distinct concavity of the dorsal outline 

 at the base of the ocular lobe. Posteriorly, the dorsal edge of the carapace is more 

 convex than in the specimen formerly figured, although not more so than in other 

 specimens in the Museum collection. The appendages present only trifling differences. 

 The basis of the first leg has a slight indication of a tooth at the distal inner corner, 

 but I find this also in the specimens formerly referred to Thomson's species. The 

 propodus of the same limb is subequal to the carpus, which is longer than the 

 dactylus. 



17. Cyclaspis thomsoni, Caiman. 



C. thomsoni. Caiman, 1907b, p. 16, pi. v, figs. 12-16. 

 Occurrence. — Stations 133, 135, and 136. Spirits Bay, near North Cape, New 

 Zealand. Plankton, at 20 metres, 3 metres, and surface. Many specimens. 



