CUMACEA FKO.M THE COPENHAGEN MUSEUM. 17 



the endopod, with a slender apical spine and a series of plumose seta; on its inner 

 edge. 



Adult i/a/e.— Total length 6-75 mm. 



Proportions and shape of carapace much as in female, but with jiseudorostrura 

 rather less prominent and ocular lobe distinctly projecting beyond the lateral lobes. 

 Surface of carapace smoother than in the female, the pitting less distinct and the 

 oblique groove faintly marked. 



First leg-bearing somite quite concealed, fourth with a slight lateral ridge, fifth with 

 a double lateral ridge. 



Abdominal somites with median dorsal but no lateral keels. 



Proportions of uropods much as in female, but the rami rather less unequal. 

 Endopod with about nine spiuules and a series of plumose setae on its inner 

 edge. Peduncle with its inner edge beset with long plumose setse. 



Bemarks. — This species is closely allied to C. levis G. M. Thomson, but it differs 

 from the specimens which I refer to that species in the much rougher surface of the 

 carapace and the presence of an oblique groove on each side ; in a slightly different out- 

 line of the dorsal edge of the carapace, which is distinctly concave at the base of the 

 pseudorostrum ; and in certain trifling differences of proportion in the first legs and 

 uropods. In the male, where the oblique grooves of the carapace are inconspicuous, 

 there is a certain similarity of outline to Mr. Thomson's figure of the male C. levis, 

 suggesting that his figure may have been drawn from a specimen of the present form. 

 Since he expressly says, however, that the surface of the carapace in C. levis is " smooth, 

 destitute of ridges or sculpturing," I have retained his name for the closely allied 

 species to which this description more nearly applies. 



Occurrence. — New Zealand, " Bay of Islands, 8 fathoms." A number of specimens, 

 mostly immature, taken at the same time as the type specimens of C. levis, were sent to 

 me by Mr. G. M. Thomson. 



Cyclaspis biplicata, sp. n. (Plate III. figs. -±-15.) 



Description of adult Female. — Total length 4*2 mm. 



The carapace is about two-sevenths of the total length, somewhat compressed, its 

 vertical height less than two-thirds of its length. The dorsal edge, seen from the side, 

 is only slightly arched. There is a sharp median dorsal keel which rises at the 

 posterior end into a broad truncated tooth. On each side of the carapace are two 

 parallel ridges, running obliquely forwards and downwards and dying out before 

 reaching the lower edge of the carapace. At their upper ends they converge and meet 

 each other close to the median keel a little behind the middle of the carapace. These 

 ridges, though sharply defined, are not prominent, and hardly interrupt the lateral 

 outlines of the carapace as seen from above. The ocular lobe is a little longer than 



VOL. XVIII. — PART I. No. 3. — August, 1907. D 



