CUMACEA—CALM AN. 
149 
of C. biplicata 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. biplicata (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 iu the holotype of ('. 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. biplicata, 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 ( '. bistnata , his observa¬ 
tion of the lateral ridges of the carapace excluding the possibility of its being paired 
with C. pus ill a as Stebbing has suggested (1913, p. 33); but Zimmer is inclined 
to uphold my separation of ( biplicata, 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. 
/(jq .3 J ^l~ST6' 
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126 ' 
