370 
GAMMAR1M). 
AMPHIPODA. GAMMARIDES. 
NAT ATOM A. 
GAMMARUS MARINUS. 
Specific character. First three segments of the pleon having the postero- 
inferior angle rounded. Posterior pair of pleopoda having the internal ramus 
very short. 
Length \ inch. 
Gammarus marinus. 
Gammarus Olivii. 
Gammarus afiinis. 
Leach, Linn. Trans, xi. p. 359. Suppl. Encyc. Brit, 
i. p. 425. Samouelle, Ent. Comp. p. 103. 
Thompson, Ann. Nat. Hist. xx. p. 242. White, 
Cat. of Brit. Crust, p. 52. Pop. Hist. Brit. 
Crust, p. 183. Desmarest, Consid. sur Crust, 
p. 267. Spence Bate, Cat. Amph. Crust. Brit. 
Mus. p. 215, pi. xxxviii. fig. 4 (not Milne 
Edwards). 
Milne Edwards, Ann. des Sc. Nat. t. xx. p. 369, 
pi. x. fig. 9, 10* (August, 1830). Hist, des Crust, 
t. iii. p. 47. 
Milne Edwards, Hist, des Crust, t. iii. p. 47, 
1840. 
* It may he useful to notice that Milne Edwards’s references in Hist. Nat. 
Crust, iii. p. 47, to his figures of G. Olivii and ornatus are reversed, and 
that even the references in the Annales, xx. pp. 372, 373, to the details of 
this species are incorrect. 
