CUMACEA FROM THE COPENHAGEN MUSEUM. 13 



CVCLASPIS UNIPLICATA, sp. 11. (Plate IV. figs. 11-20.) 



Description of immature Female. — Total length 4"9 mm. 



The carapace is distinctly less than one-third of the total length, somewhat com- 

 pressed, its vertical height not much more than one-half of its length. The dorsal 

 edge is sharply keeled, only slightly curved as seen from the side, with a prominent 

 forwardly directed tooth overhanging the base of the ocular lobe. On each side of 

 the carapace is a low but sharply marked ridge meeting its fellow about the middle of 

 the dorsal edge and running downwards and forwards in the direction of the antero- 

 lateral corner, which, however, it does not reach. Pseudorostrum short and truncated, 

 the ocular lobe reaching quite to the tip. Anteunal notch shallow, widely open. 

 Antennal tooth double, the true antero-lateral angle having external to and below it 

 a sharp spiniform tooth. The ocular lobe not longer than broad ; eye pigmented, with 

 about nine corneal lenses. 



The first leg-bearing somite is exposed dorsally. The second somite has a slight 

 dorsal keel. 



The abdomen is distinctly longer than the cephalothoracic region, subcylindrical, 

 and rather slender. 



The antennule has the third segment of the peduncle longer than tlie second, the 

 first distinctly longer than the other two together. The inner flagellum is distinct. 



The first maxilliped has the basis shorter than the distal segments together. The 

 second maxilliped is rather stout, and has also the basis shorter than the distal 

 segments. In the third maxilliped the basis is longer than the distal segments, and 

 its distal process is very long, reaching to the end of the carpus. 



The first legs are very long, extending beyond the tip of the pseudorostrum in the 

 natural position by about two-thirds the length of the carapace. The basis is less 

 than two-thirds of the length of the distal segments, and is produced on the lower side 

 of the following segment into a sharp tooth. 



The second legs are stout and have the basis shorter than the distal segments 

 together. 



In the remaining legs the basis successively diminishes in length, being longer than 

 the distal segments in tlie third pair and about half their length in the fifth pair. 



The peduncle of the uropods is longer by one-fourth than the last somite, equal to 

 the endopod, and shorter than the exopod. The endopod tapers to a sharp point, 

 and has about nine sliort spines on its inner edge. The exopod has a slender apical 

 spine and three short spines on its inner edge. 



Remarks. — In the general shape of the body and in having a tooth at the distal 

 end of the basis of the first legs this species resembles C. herdmani and C. hornelli 

 Caiman, approaching the latter species especially in the length of the first legs and in 

 the armature of the uropods. From both it is distinguished by the oblique ridge and 

 the dorsal tooth of the carapace. F. Miiller (' Fiir Darwin,' p. 54 (English ed. 



