62 CARL BOVALLIUS, THE OXYCEPHALIDS. 



part of each segment is convex in front of the projecting tooth, and 

 concave behind it, the hind corner is produced, and sharp-pointed. 



The last coalesced ural segment is about a fourth part longer 

 than broad. 



The first pair of uropoda (PL II, fig. 1) reach fully to the apex 

 of the last pair, but not to the apex of the telson; the peduncle is ser- 

 rated on both margins, and is a little longer than the inner ramus, which 

 is somewhat longer than the outer, both being serrated. The second pair 

 reach to the middle of the inner ramus of the first pair, and to the apex 

 of the peduncle of the last pair; the peduncle is quite as long as the 

 inner ramus, which is about a third part longer than, and more than 

 twice as broad as, the outer. The third pair are very broad, and 

 shorter than tbe telson; the peduncle is shorter than the inner ramus, 

 which is twice as broad as, and a little longer than, the outer. 



The telson is more than a third part longer than broad, triangular, 

 and is serrated along the margins. 



COLOUR. Light brownish to yellowish green. 



LENGTH. 20 35 mm. 



HAB. In all the seas of the subtropical and tropical regions. 



3. Oxyeephalus tuberculatus, SPENCE BATE, 1862. 



PI. II, fig. 2 and 3. 



Diagn. The body is compressed, the segments of the pereeon are 

 tuberculate. 



The head is shorter than the perseon, and has a long rostrum. 

 The hind part of the head is shorter than the rostrum. 



The front margin of the carpal process of the first two pairs 

 of perceopoda is nearly as long as the hind margin of the 

 metacarpus, which is smooth, and provided with a few 

 bristles; the lower front corner of the carpus protrudes, 

 forming a heel in front of the metacarpus. The fifth pair 

 are about as long as the sixth. The femur of the sixth 

 pair is broadly ovate, a little broader than that of the fifth 

 pair, and more than twice as long as that of the seventh, 

 which itself is more than twice as long as all the follow- 

 ing joints together. 



