] 10 CARL BOVALLIUS, THE OXYCEPHALIDS. 



last coalesced ural segment. The peduncle of the second pair reach 

 as far as that of the first, but the rami are shorter. The third pair 

 are twice as long as the telson, with the rami nearly equal in length. 

 The telson is obtusely triangular; it is a third part as long as the 

 last coalesced ural segment, and is only a little longer than the pe- 

 duncle of the last pair of uropoda. 



COLOUK. White. 



LENGTH. 11 mm. 



HAB. The Indian Ocean, Lat. 7 2 S; Long. 80 90 E. 



Geil. 10. LeptOCOtis, TH. STREETS, 1877. 



Diagn. The head is long, and produced into a comparatively short, 



narrow, sharp-pointed rostrum. The hind part of the head 



is constricted, forming a short cylindrical neck. 

 The second pair of antenna? are hidden under the head, when 



folded. 

 The first pair of perceopoda are subcheliform; the second are 



cheliform. The carpus and metacarpus of the fifth pair are 



not dilated. 

 The last coalesced ural segment is three or four times as 



long as the first, narrowly elongated, and cylindrical. 

 The inner rami of all the three pairs of uropoda are free, not 



coalesced with the corresponding peduncles. 

 The telson is narrowly elongated and cylindrical. 



Syn. 1877. Leptocotis, TH. STREETS. 24, p. 136. 



1878. 26, p. 283. 

 TH. STBBBING. 1888. 39, p. 1593. 



STREETS, when instituting the new genus Leptocotis (24, p. 137) 

 observed that it ^exhibits a remarkable blending of the characters of Oxy- 

 cephalus and Rhabdosomav. The characteristic which most suggests affinity 

 with Xiphocephalidas is undoubtedly the narrowly elongated form of the 

 last ural segment, of the peduncles of the uropoda, and of the telson. The 

 other characteristics pointed out by STREETS correspond rather with Streetsia 

 than with Xiphocephalus. From Dorycephalus the genus may he distin- 

 guished by the inner ramus of the third pair of uropoda being free, not 

 coalesced with the peduncle, and by the second pair of peraeopoda being 



