242 



AMPEIPODA. 



N ATA TORI A. 



GAMMARID.E. 



OAMMARIDE^S. 



DEXAMINE YEDLOMENSIS. N. S. 



Specific character. Last segment of tlie pereion, as well as tbe first 

 four of the pleon, dorsally carinated, and posteriorly elevated into a large 

 tootli. Peduncle of the inferior antennog with the last two joints very long, 

 and of equal length. 



Length \ inch. 



This species has the head produced anteriorly between 

 the antennae into a small process; a similar but still 

 smaller process projects upon the lateral margin, just in 

 front of the eye, between the upper and lower antennae. 

 The anterior segments of the body are smooth, but the 

 sixth exhibits a rudimentary central dorsal tooth, which 

 is increased to a considerable extent in the seventh seg- 

 ment, at once distinguishing the present species from its 

 congeners. As in D. spinosa, the four anterior segments 

 of the tail are dorsally carinated, and posteriorly elevated 

 into a tooth. The fourth segment is, moreover, distin- 



