64 CARL BOVALLIUS, THE OXYCEPHALIDS. 



4. Oxyceplialus pectinatus, C. BOVALLIUS, 1887. 



PI. II, fig. 46; and p. 25, fig. 19 and 21; and p. 27, fig. 29. 



Diagn. The body is scarcely compressed, the perseonal segments are 

 smooth. 



The head is about as long as the perseori, and has a short rostrum. 

 The hind part of the head is more than twice as long as 

 the rostrum. 



The front margin of the carpal process of the first pair of 

 perceopoda is as long as, that of the second pair longer 

 than, the hind margin of the metacarpus, which is strong- 

 ly pectinated, with long teeth, and a few long- bordering 

 bristles; the lower front corner of the carpus does not pro- 

 trude. The fifth pair are longer than the sixth. The femur 

 of the sixth pair is pear-shaped, considerably broader than 

 that of the fifth, and only a little longer than that of the 

 seventh pair, which is itself about as long as all the follow- 

 ing joints together. 



The lateral parjys of the first two pleonal segments are straight 

 in front and below, while that of the third segment is round- 

 ed; the under margins without tooth-like projections. The 

 hind corner of the first segment is rounded, that of the second 

 angular, and that of the third produced, and sharp-pointed. 



The last coalesced ural segment is much longer than the 

 telson, but not twice as long. 



The telson reaches to the apex of the last pair of uropoda. 



Syn. 1887. Oxyceplialus pectinatus, C BOVALLIUS. 35, p. 36. 



Oxycephalus pectinatus is most closely allied to 0. latirostris, 

 but differs in the length of the head, in the armature of the first two 

 pairs of peraeopoda, in the comparatively short seventh pair, and in the 

 telson being more than half as long as the last ural segment. 



The head (PI. II, fig. 4) in the male is a little longer than all the 

 perseonal segments together, in the female a little shorter. The rostrum 

 is scarcely more than a third part as long as the rest of the head. 



The first pair of antennae (p. 25, fig. 19 and 21) in the male 

 are comparatively robust; the first joint of the flagellum is three times as 



