ORDER P(ECILOPODA. 377 



form of wings, almost oval, and thrown backwards ; that the 

 other two lobes are external ovaries, or clusters of eggs, 

 analogous to those of the female Cyclopes, inserted one on 

 each side, by means of a short pedicle, at the base of thd 

 abdomen ; and that the body of the animal is composed of the 

 following parts : 1st, a distinct head, supporting two eyes, 

 separated, two antennae, lateral, short, setaceous, of eleven 

 articulations, having each a hair on the internal side, with 

 the mouth formed of a circular aperture, performing the 

 office of a cupper, and accompanied on each side with maxil- 

 liform appendages (anterior feet) : 2d, a thorax of four seg- 

 ments, having underneath five pairs of feet, the two anterior 

 of which are terminated by a very strong hook, bidenticulate 

 at the internal side, and the other eight are composed of a 

 large articulation, terminated by two stems, almost cylindrical, 

 almost equal, furnished with setae, and of three articulations 

 each : 3d, an abdomen, proceeding to a point, of five rings, 

 the first of which, being larger, gives birth to the oviferous 

 sacs, and the last is terminated by two long hairs. The 

 lateral expansions appear to be only an excessive develop- 

 ment of the fourth and last ring of the thorax. We perceive 

 in their interior two sorts of intestines, proceeding from the 

 medial line of the body, and which may be considered as two 

 cceca, or divisions of the intestinal canal, which had formed a 

 hernia. They are endued with very distinct peristaltic move- 

 ments. We have seen, in speaking of the arguli, that their 

 stomach also presents two cceca, which ramify into the in- 

 terior of the wings of the testa, and, perhaps, the thoracic 

 expansions of the nicothoes, are also two analogous lobes. 

 If so, this genus might be placed near the preceding. 



We owe our knowledge of the only species composing the 

 genus, namely, 



Nicothoe astacL Ann. des Scienc. Nat. Die. 1826, xlix. 



