NICOTHOE. 301 
from the egg up towards maturity, of a highly interesting 
nature. 
Anatomy and Physiology , 8fc . — The figure of the body 
is conical, with two enormous lateral expansions, and we 
can distinguish three distinct parts ; the head, thorax, 
and abdomen. 
The head is moderately small, rounded, and obtuse. 
The eyes are two ; simple, circular, and situated on the 
frontal edge. The antennae arise from under this frontal 
margin, and are very slender, consisting of ten or eleven 
small articulations,* each of which is furnished with a 
very small seta. The mouth and the organs belonging 
to it are very small. These consist of a short, truncated, 
cylindrical tube, of a tolerably thick substance, and a 
horny texture, and within its cavity what Rathke believes 
to be two mandibles. These latter organs, however, are 
so minute, that he could not state positively what they 
were, nor could he figure them. 
The foot-jaws are three pairs in number. The first 
pair is nearly rudimentary, and appears to be fringed 
with several short bristles. The second pair is somewhat 
larger, conical, and consists of two joints, the terminal 
joint having at its extremity two moderately strong teeth. 
The third pair is considerably larger than the preceding, 
and consists each of three articulation s^ the first and second 
of which are rather long, and moderately thick, and the 
terminal one is in form of a sharp-pointed claw, which 
is somewhat prolonged, and furnished on the concave 
side with two teeth. 
The thorax is very large compared with the size of the 
head, and consists of five segments. It extends laterally, 
in the form of two wing-like lobes, or wallet-shaped ap- 
pendages, which diverge at first nearly at right angles, 
and then curve downwards. On the upper surface we 
see three narrow bands running across the central portion, 
* Kroyer says ten ; M. Edwards, eleven. 
