NICOTHOE. 301 



from the egg up towards maturity, of a highly interesting 

 nature. 



Anatomy and Fliysiology , Sfc. — 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 antenuEe 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 figm-e 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 articidations, 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, 



* Kvover says ten ; M. Edwards, eleven. 



