AMPHIPODA. 



NATATORIA. 



MEGAM(ERA BREVICAUDATA. 409 



OAMMARIDES. 



MEGAMCERA BEEVICAUDATA. 



S^yecifc character. Posterior margin of the first three segments of the 

 tail sliglitly serrated. Superior antennae having the flagellum short. Second 

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

 of pleopoda with the rami short. 



Length A inch. 



Gammarus hrericaudatus. 



Megamoera hrevicaudata. 



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



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



Pop. Hist. Brit. Cnist. 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- 



