APPENDIX. 



AMPHIPODA. 



NATATORIA. 



515 



GAMMARIDES. 



I VoK I. p. 410.*) 



MEGAM(EEA MULTIDENTATA. (Norman MS S.) 



Specific character. Body long and slender. Second segment of pleon with 

 three teeth on the middle of the posterior margin ; third segment with four ; 

 fourth, fifth, and sixth segments with two similar teeth. 



Length, six-tenths of an inch. 



The body is long and slendei', with the segments subequal ; 

 the second segment of the pleon having a centi'al, and on 

 each side a lateral tooth on the posterior dorsal margin ; third 

 having a central and two lateral teeth on the dorsal margin ; 

 the three following segments without a central, but possessing 

 on each a lateral tooth, at the base of which a strong hair or 

 spine exists. 



The eyes are round aiid black. The superior antennae are 

 half the length of the animal, and the peduncle is half the 

 length of the antennae. The first joint is as long as the 

 cephalon ; the second joint is a little longer and slighter than 

 the first; the third is short. The articuli of the flagellum 

 are as long again as broad ; the secondary appendage consists 

 of five articuli. The inferior antennae are about half the length 

 of the superior ; the peduncle extends to the extremity of the 

 second joint of the peduncle of the superior. Olfactory denticle 



L L 2 



