386 
GAMMARID.E. 
A MP II IP OB A . OA MMARIDES. 
NATATORTA. 
GAMMARUS EDWARDSII. 
Specific character. Like G. locusta, but more robust. Gnatbopoda having 
the pleopoda truncate. Posterior pair of pleopoda short ; having the rami 
equal, and not longer than the peduncle. 
Length, § inch. 
Gammarus marinus. Milne Edwards, Hist, des Crust, iii. p. 46 (not 
Leach.) White, Hist. Brit. Crust, p. 188. Spence 
Bate, Ann. Nat. Hist. 2 ser. xix. p. 144. 
Gammarus Edwardsii. Spence Bate, Cat. Amph. Brit. Mus. p. 208, 
pi. xxxvii. fig. 2. 
This species resembles G. locusta in its general aspect, 
but may be readily distinguished from it by the more 
robust appearance of the animal and the shortness of the 
antennae. The upper pair are about a third of the length 
of the animal ; the flagellum is longer than the peduncle, 
and the secondary appendage has only three articuli.* 
The inferior antennae are shorter than the superior. 
The hands of the first pair of legs are broadly ovate, 
having the palm scarcely oblique. The second pair of 
legs have the hands longer, and slightly narrower than 
* It is proper to observe that, whilst M. Milne Edwards states that the 
last pair of abdominal appendages scarcely extend beyond the preceding pair, 
he expressly says that the accessory appendage of the antennae is longer than 
in G. locusta. 
