MEGAMCERA ALDERI. 



AM PHI POD A, 



NATATORIA. 



407 



GAMMA RIDES. 



MEGAMCERA ? ALDERI. 



Specific character. Posterior dorsal margin of the third and fifth segments 

 of the pleon produced to a small tooth. Second pair of gnathopoda larger 

 than the first, having the propodos ovate, palm oblique, serrated, and denned 

 by a tooth. 



Length 5 5 g inch. 



Megammra Alchri. Spence Bate, Cat. Amph. Brit. Mus. p. 228, pi. xl. 



fig. 1. 



The third segment of the tail is posteriorly produced 

 in the middle of the dorsal margin into a small point. 

 The fourth does not appear to be so produced, whilst the 

 fifth has a small central, and close upon each side a large 

 lateral, tooth. The eyes are round or oval. The su- 

 perior antennae are about two-thirds of the length of the 

 animal ; the flagellum longer than the peduncle, and the 

 secondary appendage consisting of three articuli. The 

 inferior antennae reach a little beyond the peduncle of 

 the superior. The first pair of legs have the wrist 

 longer than the hand ; the palm is oblique and longer 

 than the inferior margin. The second pair of legs are 

 larger than the first ; the hand is nearly of the same form, 



