GAMMARELLA NORM ANN I. 
QQQ 
ooo 
A MPIIIP OP A . GAMMA RIDES. 
NATATOHTA. 
GAMMARELLA NORMANNI. N.S. 
Specific character. Like G. brevicaudata, except that the flagella to the 
antennae are longer, and the second pair of gnathopoda not larger than the 
first. 
Length 2 5 g inch. 
This animal bears so close a resemblance to the pre- 
ceding, that we are inclined to think that it may only 
be the female of that species.* The difference of certain 
parts, however, which seldom vary in individuals of the 
opposite sexes, induce us provisionally to describe it as 
the female of a distinct species, until future research 
shall demonstrate its true relation to G. brevicaudata . 
The chief differences are, that in this species the 
superior antennae are nearly as long as the animal ; the 
flagellum being nearly as long again as the peduncle ; 
and the secondary appendage is longer than the last joint 
of the peduncle. The inferior antennae have tire ped- 
uncle as long as the peduncle of the superior, and the 
flagellum is as long as the peduncle. The first two pairs 
of legs are small and similarly formed ; the wrists are 
long and narrow, and the hands are not broader than the 
* In this opinion we are supported by the statement of Dana, that the 
female of Gammarella ( Gammarus ) pubescens has the second pair of hands 
but little larger than the first. 
