134 CARL BOVALLIUS, THE OXYCEPHALIDS. 



COLOUR. ? 



LENGTH. The specimen outstretched measured four-fifths of an inch, the 



rostrum being broken (STEBBING). 



HAB. North Atlantic, Lat. 10 55' N., Long. 17 46' W. surface. 



- One specimen, female (STEBBING). 



Syn. 1888. Rhabdosoma brevicaudatum, TH. STEBBING 39, p. 1612, pi. 208. 



Xiphoeephalus brevicaudatus comes near to X. armatus in 

 the form of the first and seventh peraeonal segments, in the somewhat 

 dilated femora of the fifth and sixth pairs, in the short first ural seg- 

 ment, and in the very short outer rami of the uropoda; to X. Lillje- 

 borgi it shows relationship in the form of the first pair of perasopoda, 

 and in the length of the peduncle of the first two pairs of uropoda. 

 From all the other species it is easily distinguished by the serration of 

 the hind margin of the carpal process in the first pair of perseopoda. 



For further details I refer the reader to STEBBING'S work. 



