G WMMARELLA NORMANNI. 333 



A M PHIP OVA . GA MM A RIDES. 



NATATOU1A. 



GAMMARELLA NORMANNI. N.S. 



Specific character. Like G. Irevicaudata, except that the flagella to the 

 antennas are longer, and the second pair of gnathopoda not larger than the 

 first. 



Length ^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 antennas 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 the 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 GammareUa (Gammarus) 2 )ll bescens has the second pair of hands 

 but little larger than the first. 



