OxYCEPHALUS LATIROSTRIS. 67 



The lateral parts of the pleonal segments are feebly rounded in 

 front, and almost straight below, the under margins being with- 

 out tooth-like projections; the hind corner of each is angular. 



The last coalesced ural segment is about twice as long as 

 the telsoD. 



The telson is much shorter than the last pair of uropoda. 



Syn. 1879. Oxycephalus latirostris, C. Claus. 27, p. 193(47). 



» >; » 1887. 36, p. 71, pi. 



24, fig. 1. 

 » » » C. BovALLius. 1887. 35, p. .36. 



Oxycephalus latirostris agrees in some characteristics with 

 0. piscator, as for instance in the length and general form of the cheli- 

 form hand in the second pair of perfeopoda, and in the form of the 

 urus and its appendages, but the distinguishing characteristics are many. 

 From 0. pectinatus it is, as I have already said (p. 62), easily distinguished. 



The head is a little longer than the first six pergonal segments 

 together. The rostrum is less than a third part of the length of the 

 rest of the head. 



The perœon shows a slight transversal depression on the dorsal 

 side of each segment. 



The first pair of perœopoda (PL II, fig. 9) are shorter than the 

 second; the lower front corner protrudes a little in front of the base 

 of the metacarpus ; the carpal process is much shorter than the stem of 

 the joint, but longer than the hind margin of the metacarpus, and is 

 serrated along the front margin, with strong, equal, rounded teeth; it is 

 also serrated along the hind margin. The metacarpus is considerably 

 shorter than the stem of the carpus, and serrated like the carpal process. 

 The dactylus is shorter than a fourth part of the metacarpus, and has a 

 blunt tooth at the hind margin. The second pair (PI. II, fig. 10} have 

 the cheliform hand much longer than the first, the carpus, without the 

 process, being half as long again as the metacarpus; the hind margin of 

 the carpus and of the process is set with short slender bristles; the carpal 

 process is serrated along the front margin as in the first pair, and 

 reaches almost to the apex of the dactylus. The metacarpus and dacty- 

 lus are like those in the first pair. The fifth pair are the longest; 

 the femur is elongate-ovate, more than twice as long as broad, and shorter 

 than the three following joints together. The femur of the sixth pair 

 (PL II, fig. II) is narrowly pear-shaped, with the margins smooth, twice 



