142 TANAID®. 
little longer than the fourth, but about the same length 
as the sixth, while the seventh is about half the length 
of the sixth. 
The pleon has the first five segments subequal, but the 
sixth or terminal is quite as long as two of the preceding, 
and terminates in a central point that is furnished with 
a solitary hair upon each side of the apex. 
The eyes are small and not easily recognized. The 
antenne are short, the superior being more robust and 
slightly longer than the inferior, and tipped with a few 
cilia; in length they equal that of the cephalon and first 
joint of the pereion, which being fused together form 
the head. The superior antenna consists of four joints, 
that is, a peduncle of three and a uniarticulate flagellum, 
but which is more slender and longer than the last joint 
of the peduncle. The inferior antenna appears to ter- 
minate in a similar uniarticulate flagellum. The first pair 
of gnathopoda are long and robust, of which the hand is 
not larger than the rest of the limb. The carpus is as 
long as the propodos, and the dactylos is long, curved, 
and slender, forming with the digital process of the 
propodos, against which when closed it impinges closely 
through its entire length, a sharply-pointed and somewhat 
elongate chela. The second pair has the dactylos long 
and slender, being hair-like at its extremity and slightly 
curved ; the remaining pairs of legs, the true pereiopoda 
or walking legs, are subequal in length, of somewhat 
slender and feeble proportions, and terminate in small 
curved dactyla, The five anterior pairs of pleopoda are 
pedunculated and liberally ciliated on the outer and 
posterior margins. The posterior pleopoda are biramose, 
the inner branch being rather shorter than the ultimate 
segment of the pleon; it is single-jointed, but furnished 
near the middle, on the inner side, with a small pro- 
