88 Carl Bovallius, The Oxycephalids. 



The hind part of the head is not constricted ; the rostrum seen 

 from above (PL IV, fig. 2) is elongate-k^nceolate. 



The epiraerals are not as high as in the preceding species. 



The first pair o{ perœopoda (PI. Ill, fig. 13) have the carpus 

 longer than broad, with the under margin somewhat convex; the hind 

 margin has a single bristle; the lower corner projects into a strong, 

 narrow tooth, and shows five or six sharp broad teeth on the hind margin 

 above the apical tooth; the two undermost teeth are much longer than 

 the others; the under margin shows four broad, triangular teeth in front 

 of the large apical tooth; the metacarpus has the same form as in the 

 preceding species, but is nearly twice as long as broad; the dactylus is 

 curved, and armed with a small tooth on the hind margin a little below 

 the middle. The second pair (PI. Ill, fig. 14) have the carpus pro- 

 duced so as to form with the metacarpus an almost cheliform hand, 

 though it is really only a subcheliform hand, because the metacarpus 

 does not impinge upon the apex of the carpal process but passes 

 across the inside of it, the edge of the metacarpus and the sharp front 

 margin of the carpal process meeting one another like the blades of a 

 pair of scissors; the dactylus is like that in the first pair. The fifth 

 pair are much longer than the sixth; the femur is twice as long as broad, 

 and quite as long as the three following joints together. The sixth 

 pair have the femur a little shorter than all the following joints to- 

 gether. The seventh pair (p. 34, fig. 58) are about as long as the femur 

 of the sixth; the femur is almost triangular, with the margins feebly 

 convex, and is not fully twice as long as it is broad at the base; it is 

 scarcely longer than the three following joints together. 



The pleon is as long as the first five perseonal segments together. 

 The hind corner of the third segment is produced backwards, and is 

 broadly rounded. 



The first pair of uropoda (PI. Ill, fig. 15) reach a little beyond 

 the middle of the inner ramus of the last pair; the peduncle is linear, 

 and about five times as long as broad; the inner ramus is elongate- 

 lanceolate, serrated on both margins, with spine-like teeth, and is conside- 

 rably longer than the outer ramus, which is elongated, somewhat curved, 

 smooth on the outer margin, and serrated on the inner. The second 

 pair reach to the middle of the inner ramus of the last pair; the ped- 

 uncle is as long as the inner ramus, which is broader, and much longer, 

 than the outer; both rami are serrated as in the first pair. The third 

 pair reach as far as five-sixths of the length of the telson; the peduncle 



