GAMMARELLA. 
829 
AMP II IP OB A, 
NAT ATOM A, 
OA MM A R IDES. 
Genus— GAMMARELLA. 
Gammarella. Spence Bate, Ann. Nat. Hist. 2 ser. xix. p. 143. Cat. 
Amph. Crust. Brit. Mus. p. 179. White, Hist. Brit. 
Crust, p. 181. 
Oammarus part. Dana, H. S. Explor. Exped. p. 956. 
Generic character. Superior antennae furnished with a 
secondary appendage. Gnathopoda very unequal in size in the 
male, subchelate. Posterior pair of pleopoda unibranched. 
Telson single cleft. 
The superior antennae in this genus are longer than 
the inferior, and furnished with a secondary appendage. 
The hands of the first two pairs of legs are subchelate. 
The caudal appendages have their branches short, the last 
pair are furnished with but a single branch. The central 
tail-piece is single, but divided at the apex. 
This genus forms a curious link between the family 
Orchestiidce, and the subfamily Gammarides, possessing, as 
it does, the superior antennae of Gammarus , and caudal 
appendages similar to those of Orchestia . It moreover 
appears to differ from Crangonyx only in having the 
second pair of hands in the male larger than the first. 
