350 
GAMMARID2E. 
AMP HIP OB A. 
NAT ATOM A . 
GAMMARIBES. 
MCERA GROSSIMANA. 
Specific character. Superior antennao half as long as the animal : ped- 
uncle very long, with the second joint longer than the first : the short 
flagellum not more than half the length of the peduncle : secondary append- 
age half the length of the flagellum. Second pair of gnathopoda oblong ; 
palm slightly oblique. 
Length A inch. 
Cancer ( Gammarus ) grossimanus. 
Mcera grossimana. 
Gammarus grossimanus. 
Gammarus Impostii. 
Montagu, Linn. Trans, ix. t. iv. fig. 5. 
Leach, Edin. Encyc. yii. p. 403. Linn. 
Trans, xi. p. 359. Suppl. Enc. Brit. i. 
p. 425. Samouelle, Ent. Comp. p. 103. 
Desmarest, Consid. sur Crust, p. 265. 
Spence Bate, Cat. Amph. Brit. Mus. 
p. 188, pi. xxxiv. fig. 3. 
Milne Edwards, Hist, des Crust, t. iii. 
p. 54. White, Cat. Brit. Mus. Crust. 
1847, and Cat. Brit. Crust. 1849, 
p. 53. Pop. Hist. Brit. Crust, p. 185. 
Gosse, Man. Mar. Zool. i. p. 141. 
Spence Bate, Synop. &c. Ann, Nat. 
Hist. 2 ser. xix. p. 145. 
Milne Edwards, Ann. des Sc. Nat. t. xx. 
p. 368. Hist, des Crust, t. iii. p. 49. 
In this animal the head is not deep, but nearly as long 
as the first three segments of the body. The body itself 
