The Cumacea of the Puritau Expedition. 415 



Carapace (iucluding pseudo-rostrum) about 31/2 times in total 

 lengtli, the dorsal crest horizontal posteriori}', strongly eurved 

 downwards in front and armed in its anterior two-tbirds with about 

 seven stout eurved teeth, well separated and diminishing in size 

 posteriorly. Pseudorostrum (fig*. 2) more than Vs ^f total length 

 of carapace, straight, tapering to an acute point and directed slightly 

 upwards. The lower margin bears two or three more or less distinct 

 teeth near the base. Antero-lateral margin nearly straight with a 

 narrow but deep antennal notch above which bears three or four 

 stout teeth. Antero-lateral angle not produced but hearing a strong 

 tooth, followed by a series of successively diminishing teeth on the 

 lower margin. The pleural piate of the penultimate thoracic 

 somite is produced into a sharp eurved tooth posteriorly, and there 

 is a pair of eurved teeth on the sternal surface of the last thoracic 

 soQiite (not one as stated by Norman) a little in front of the in- 

 sertion of the last pair of legs (fig. 3). The abdomen is about 

 equal in length to the cephalothoracic region. 



The antennules (fig. 4) bave the outer flagellum composed 

 of three segments, the first equal in length to the last segment of 

 the peduucle and the terminal one very small. The inner flagellum 

 is uusegmented and is equal in length to the first segment of the 

 outer. It bears several long and rather stout setse at the tip. 



There is a row of strong teeth on the lower surface of the basis of 

 the first legs. Uropods (fig. 5) a little shorter than the last two 

 somites together, the peduncle longer by one quarter than the last 

 somite, carryiug about five spines on its inner edge. Eudopod one- 

 third longer than the peduncle, the proximal segment more than 

 three times as long as the distai. Fifteen spines on inner edge of 

 proximal and five on distai segment besides the stout terminal spine. 

 One long and several short seta^ on outer margin. Exopod a little 

 longer than first segment of endopod, hearing set« on both margins 

 and a group on the apex. 



Adult male (fig. 6). Total length 6,0 mm. Carapace Y4 of 

 total length, the dorsal crest unarmed. Pseudorostrum (fig. 7) 

 Vs of total length of carapace, horizontal and obliquely truncate. 

 The lower angle bears one or two teeth. Antero-lateral margin straight 

 and vertical, without antennal notch, with two teeth above near 

 base of pseudorostrum. Tooth on antero-lateral angle followed by 

 a series of serrations on anterior part of lower margin. 



The pleural piate of the penultimate thoracic somite is not 



