384 
GAMMARIDiE. 
AMPHIPODA. 
NATATORIA, 
GA MM A RIDES. 
Specific character. Flagellum of inferior antennae very short. Gnatho- 
poda having the propoda more slender than the carpi. 
Length if inch. 
Gammarus tenuimcmus. 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 
antennae 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- 
tennas, 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 
