386 



AMPHIPODA. 



NATATORTA. 



GAMMA RID JE. 



GAMMARIDES. 



GAMMARUS EDWARDSII. 



Specific character. Like G. locusta, but more robust. Gnathopoda having 

 tbe pleopoda truncate. Posterior pair of pleopoda sbort ; having the rami 

 equal, and not longer than the peduncle. 



Length, | inch. 



Gammarus marinas. 



Gammarus Echvardsii. 



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. 



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 antennas is longer than 

 in G. locusta. 



