MEGAMCERA BREVICAUDATA. 



409 



AMPHIPODA. 



NJTATORIA. 



OAMMARIDES. 



MEGAMCERA BREVICAUDATA. 



Specific character. Posterior margin of the first three segments of the 

 tail slightly serrated. Superior antennas having the flagellum short. Second 

 pair of gnathopoda larger than the first. Propoda long- ovate. Posterior pair 

 of pleopoda with the rami short. 



Length 5 6 s inch. 



Gammarus brevicaudatus. 



Mega nicer a b rev ica u data . 



Spence Bite, Rep. Brit. Assoc. 1855, p. 58. 



Ann. Nat. Hist. 2 ser. xix. p. 145. White, 



Pop. Hist. Brit. Crust, p. 185 (not of Milne 



Edwards). 

 Spence Bate, Cat. Amph. Brit. Mus. p. 228, 



pi. xl. fig. 2. 



This species was first mistaken, by Mr. Spence Bate, 

 for Gammarus brevicaudatus of Edwards, with the de- 

 scription of which it was supposed to correspond. The 

 opportunity since afforded to us of examining the typical 

 specimen preserved in the Museum of the Jardin des 

 Plantes, having demonstrated that the Parisian specimen 

 belongs to another genus, we have retained the specific 

 name for the present animal. 



The body is robust, with the hinder portion compara- 

 tively short. The three anterior segments of the tail 

 have the posterior margin slightly serrated. The su- 



