330 
GAMMARIDiE. 
AMPHIPODA. 
NATATORIA . 
GA MM A RIDES. 
GAMMAKELLA BREVICAEDATA. 
Specific character. Superior antennas half the length of the animal. 
Inferior antennae scarcely longer than the peduncle of the superior. First 
pair of gnathopoda small ; second pair having the propodos very largely 
developed. Posterior pair of pleopoda having the ramus not longer than the 
peduncle. Telson as broad as long. . 
Length \ inch. 
Gammarus brevicaudatus. 
Gammarella brevicaudata. 
Gammarella orchestiformis. 
Gammarus punctimanus. 
Milne Edwards, Ann. des Sci. Nat. t. xx. 
p. 369. Hist, des Crust, t. iii. p. 53. 
Spence Bate, Cat. Amph. Crust. Brit. Mus. 
p. 180, pi. xxxii. fig. 8. 
Spence Bate, Ann. Nat. Hist. 2 ser. xix. p. 143. 
White, Hist. Brit. Crust, p. 181. 
Costa, Mem. Reale Accad. d. Sci. di Napoli, 
vol. i. tav. iii. fig. 6, 1853. 
The dorsal surface in this species is slightly elevated 
at the posterior portion of each segment, especially in 
the fourth segment of the tail, owing chiefly to the 
smallness of the two succeeding segments, which appear 
