90 Carl Bovallius, The Oxycephalids. 



The telson is lanceolate, very sharp-pointed, and somewhat 

 more than twice as long as broad. 



Syn. 1887. Oxycephalus Steenstrupi, C. Bovallius. 35, p. 37. 



Streetsia Steenstrupi comes near to the next species, 5. ^on^iyi- 

 ceps, Claus, but differs from it in the very long and strongly developed 

 seventh pair of perajopoda, by the last coalesced ural segment being 

 rather shorter than the telson, and by the peduncle of the second 

 and third pairs being not longer than the corresponding inner rami. 



The Oxycephalus longiceps., Stebbing, agrees with the specimens 

 of Streetsia Steenstrupi, which I have examined, in the characte- 

 ristics of the seventh pair of perneopoda and the uropoda, and thus decid- 

 edly differs from Oxycephalus lonyiceps, Claus, but as it also differs from 

 Streetsia Steenstrupi in the characteristics of the first two pairs of 

 perœopoda, I can scarcely consider it identical either with the present 

 species or with Streetsia longiceps., Claus, and think that it ought to 

 have a new specific name. 



The body is compressed, but not at all carinated. 



The hind part of the head is a little constricted; the rostrum seen 

 from above is broadly lanceolate, with the apex narrowed. 



The first pair of antennœ (PI. Ill, fig. 3) have the first flagellar 

 joint fully twice as long as is it is broad at the apex, which is dilated 

 downwards and forwards; the second flagellar joint is about as long as 

 the third, and is provided with three very long olfactory hairs; the fourth 

 joint is unusually short, cylindrical, and scarcely a third part as long as 

 the third (p. 25, fig. 20). 



The epimerals are high, but not longer than the under margins 

 of the corresponding pergeonal segments. 



The first pair of perœopoda (p. 32, fig. 52) have the carpus con- 

 siderably longer than broad; the hind margin is richly fringed with long 

 stout bristles ; the under margin is concave, entirely smooth and sharp- 

 edged; the lower corner is a little projecting forming a broad and short 

 triangular process, but not outdrawn into a spine-like tooth; the sides 

 of the triangular projection are densely covered with very stout and 

 long bristles ; the metacarpus is very thick and short, less than a third 

 part longer than broad; the front margin is strongly convex, and provided 

 with four or five very long bristles; the hind margin forms a very thin 

 and sharp edge, which is smooth, but which, when examined under a strong 



