384 GAMMARIM. 



A MP HIP OB A . GA MM A RIDES. 



NAT ATOM A. 



GAMMARUS TENUIMANUS. 



Specific character. Flagellnni of inferior antennae very short. Gnatho- 

 poda having the propoda more slender than the carpi. 

 Length \l inch. 



Gammarus tenuimanus. Spence Bate, Cat. Amph. Brit. Mus. p. 214, 



pi. xxxviii. fig. 2. 



This species very closely resembles G. locusta, but 

 differs from it in having the flagellum of the inferior 

 antennas shorter than the peduncle, and in the hands 

 on the first two pairs of legs being very slender. The 

 first two pairs of legs are of the same size, and have the 

 wrists as long as the hands, but wider ; the hands are 

 long, ovate, and have no defined palms ; the fingers, 

 which are very short, close upon the inferior margin. 

 Both the wrists and hands have the margins furnished 

 with bundles of tolerably long hairs. The posterior 

 pair of pleopoda are, unfortunately, absent from the only 

 specimen that we have seen. 



The shortness of the flagellum of the inferior an- 

 tennae, and the slenderness of the first two pairs of legs 

 suggest the possibility that the specimen upon which the 

 species is established may have been injured, and have 

 had these organs reproduced of a diminished size. As 



