ORDER PCECILOPODA. 
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 the 
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 
coeca, 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 ccoca, 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 astaci, Ann. des Scienc. Nat. Die. 1826, xlix. 
