370 



AMP BIPOD A. 



NATATOEIA. 



GAMMARID.E, 



GAMMA RIDES. 



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. 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). 

 Gammarus Olivii. MILNE EDWARDS, Ann. des Sc. Nat. t. xx. p. 369, 



pi. x. fig. 9, 10* (August, 1830). Hist, des Crust. 



t. iii. p. 47. 

 Gammarus affinis. MILNE EDWARDS, Hist, des Crust, t. iii. p. 47, 



1840. 



* It may be 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. 



