274 SPECIFIC DESCRIPTION. 
and anterior to the posterior extremity of the 
sixth segment. 
The eyes are small, and placed upon peduncles, 
that gradually taper from the base to the ex- 
tremity. The first pair of antenne are short, 
and developed upon the type of those of the 
brachyura; but the first joint is reduced to a 
size that is only about twice the diameter of the 
second. The second pair of antennz are but 
little longer than the first, and are furnished 
with a broad round scale at the third joint, and 
a terminal flagellum, that is about the length of 
the fifth joint of the peduncle. The squamiform 
appendage is circular and dishlike; the inner 
margin is straight, or somewhat excavated. 
The second pair of gnathopoda have the third 
joint much broader than the fourth (the second- 
ary appendage reaches not to the extremity of 
the third), and have the terminal joints small 
and rudimentary. The first pair of pereiopoda 
are subequal in the female, the propodos upon 
the right side being somewhat larger than on the 
left; the surface is smooth and even, and the 
dactylos is furnished with a prominent carina, 
that terminates abruptly near the basal articula- 
tion, and loses itself gradually towards the apex. 
The fifth pair of pereiopoda are completely 
