OXYCEPHALUÖ P18CAT0R. 57 



The lateral parts of the pleoni segments are rounded in front 

 and below, and the under margins are not produced into 

 tooth-like projections; the hind corners are angulated, and 

 sharp-pointed, but not produced. 



The last coalesced ural segment is much longer than the telson, 

 but not twice as long. 



The peduncle of the first and second pairs of uropoda is 

 longer than the inner ramus; the peduncle of the third pair 

 is a little shorter than the inner ramus. The outer rami 

 are somewhat shorter than the inner. 



The tel'ion is tongue-shaped, with the apex sharp-pointed and 

 the margins serrated; it is somewhat shorter than the last 

 pair of uropoda. 



1836. 



1878? 

 1879. 



1884. 



The animal, described and figured below is, in my opinion, the 

 true Oxycephalus piscator of H. Milne Edwards; a comparison of 

 the original diagnosis with the following description and drawings will 

 show that all the characteristics given by H. Milne Edwards agree with 

 those of this animal. I am also pretty sure that the Oxycephalus siniilis, 

 Olaus, is identical with this species, the more so as I have examined 

 many specimens taken at the very same locality, Messina, by my friends 

 Professor Hjalmar Théel and D:r A. Appelôf. And again I am con- 

 vinced that Oxycephalus Edwardsii^ G. W. Thomson, is nothing but the 

 young male of 0. piscator. Whether 0. bulbosus, Th. Streets, is an 



Nova Acta Reg. Soc. Sc. Dps. Ser. III. 8 



