CUMACEA PEOM THE COPENHAGEN MUSEUM. 353 



Avidth is greater than the depth, much narrowed in front. Seen from the side the 

 dorsal edge is convex, with a slight elevation at the posterior margin bearing a small 

 tubercle ; the pseudorostrum is short, directed obliquely upwards, narrowly truncate ; 

 antero-lateral margin deeply concave, anterolateral angle produced into a blunt spine 

 with a few setae at the apex. Seen from above, the lateral plates of the pseudo- 

 rostrum meet below but not above the respiratory channel, so that the opening of the 

 latter extends back to the interocular margin; only the tips of the antero-lateial 

 angles project laterally. The eyes are small and darkly pigmented, and the distance 

 between them is about one-fourth of the length of the carapace. The surface of the 

 carapace is smooth, with very minute scattered setae, and there is a slight depression 

 on each side behind the eye. 



The first leg-bearing somite is reduced to a very narrow strip behind the carapace, 

 expanding below into the pleural plates, which, like those of the following somites, 

 are spread out laterally. 



The abdomen is about equal in length to the cephalothoracic region, slender and 

 cylindrical, without teeth or spines ; the fifth somite is about one-third longer than 

 the preceding somite. 



The third maxillipeds have no exopods ; the basis is a little more than one-third of 

 the total length. The first and second legs carry exopods. The remaining legs are 

 slender and do not differ greatly in length. The proportions of the last pair are much 

 as in the male. 



The uropods have the peduncle about half as long as the last somite. The endopod 

 is about three times as long as the peduncle, with a stout terminal spine of less than 

 half its length and two spinules on the inner edge, which is finely serrated throuo-hout. 

 The exopod is less than one-eighth of the length of the endopod, with a slender terminal 

 spine which reaches beyond the middle of the latter. 



There is an irregular patch of dark pigment on each side of the anterior part of the 

 carapace and a band encircling the penultimate somite of the abdomen. 



Adult Male. — Total length 1-6 mm. 



Carapace a little more than one-third of total length, not so deep as in the female, 

 not much narrowed in front, its width greater than its depth. Seen from the side the 

 dorsal edge is nearly straight, with a median depression between the inflated branchial 

 regions ; the pseudorostrum is very short and blunt ; antero-lateral margin deeply 

 concave, antero-lateral angle rounded and armed with a curved spine, behind which 

 are a few irregular serrations. Seen from above, the lateral plates of the pseudorostrum 

 meet for a short distance above the respiratory channel and the antero-lateral angles 

 project laterally. The eyes are large and darkly pigmented, and the distance between 

 them is not more than one-sixth of the length of the carapace. The surface of the 

 carapace is very minutely granular. 



The first leg-bearing somite is hardly visible and its pleural plates are very small. 



