134 Carl Bovallius, The Oxycephalidb. 



Colour. ? 



Length. »The .specimen outstretched measured four-fifths of au inch, the 



rostrum being brolien» (Stebbing). 

 Hab. »North Atlantic, Lat. 10" 55' N., Long. 17» 46' W. .surface. 



— — One specimen, female» (Stebbing). 



Si/ii. 1888. Rhabdosoina brevicaudatuiii, Th. Stebbing 39, p. 1612, pi. 208. 



Xiphoeephalus brevicaudatus comes near to A', armatiis in 

 the form of the first and seventh perfeonal 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 A'. Lillje- 

 borgi it shows rehitionship in the form of the first pair of perœopoda, 

 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 peraeopoda. 



For further details I refer the reader to Stebbing's work. 



