130 Carl Bovallius, The Oxycephalids. 



middle (p. 30, fig. 47). The epimeral of the seventh pair has the front 

 corner feebly rounded and the hind part deeply projecting downwards, 

 almost crescent-shaped, with the sharp-pointed apex directed straight 

 downwards. On the manner of bearing the eggs and young see above 

 p. 31 and 43, and also PI. VII, fig. 20. 



The branchial vesicles (p. 30, fig. 46) are like those in Xiphoce- 

 phalus armatus^ and are attached to the second, third, fourth, fifth, and 

 sixth pairs of peraeopoda in the male as well as in the female. 



The perœopoda. The first pair (PL VII, fig. 15) have the carpus 

 comparatively broader than in the preceding species; the carpal process 

 is broadly triangular; the hind margin is entirely smooth, without tooth; 

 the front margin is serrated, and is much longer than the hind margin 

 of the metacarpus, reaching beyond the apex of the dactylus; the hind 

 portion of the metacarpus is produced at the lower corner into a sharp- 

 pointed angle; the dactylus is curved, and is about half as long as the 

 metacarpus. The second pair (PI. VII, fig. 16) are much longer than 

 the first; the carpal process reaches a little beyond the apex of the 

 metacarpus, but does not attain the apex of the dactylus. The third 

 and fourth pairs are similar in shape and equal in length; the femur 

 is narrower at the base than at the apex; the tibia is longer than 

 the femur, linear in the male and in the not ovigerous female, but in- 

 flated, as well as the carpus, in the female which carries more or less 

 developed eggs. The fifth and sixth pairs are similar in shape and 

 subequal in length, the sixth sometimes being a trifle longer than the 

 fifth; the femur is longer than in the two preceding pairs, narrow and 

 linear, about ten or eleven times as long as broad, and a little longer 

 than the tibia; the tibia and carpus are inflated in ovigerous females 

 (p. 42, fig. 85), as I have said above, but linear in the other individuals; 

 the not inflated carpus and the metacarpus of the sixth pair are armed on 

 the front margin with peculiar comb-like sets of spines or bristles fixed 

 on ovate discs (see above p. 35 — 36 and p. 35, fig. 63 — 64); the meta- 

 carpus is longer than the carpus, and the dactylus is more than a third 

 part as long as the metacarpus. The seventh pair consist of a single, 

 evenly rounded, bladder-like joint. 



The pleon is carinated; in the male it is considerably longer than 

 the perseon; in the female it is scarcely longer than the last six perseonal 

 segments together. The under margin of the pleonal segments is strongly 

 convex or rather protruding, the hind corner is produced into a tolerably 

 long and sharp-pointed process. 



