328 CLASS CRUSTACEA. 



tail are in the form of setae. Nehalia Herbstii, Leach., Zooh, 

 Miscall, xlv. Desm. Consid. xl. 5 ; Rambd. monoc. i. 8, 9 ? 



The nehalie ventrue of M. Risso, (Journ. de Phys. Octobre, 

 1822) probably constitute in the section of the Schizopoda, 

 a subgenus proper. In the cyclops exiliens of Viviani, the 

 thorax is divided into several segments, which circumstance 

 excludes it from the nebaliae. It also forms a new subgenus, 

 intermediate between the preceding and the following. 



There the thorax, or the testa, seen from above, is divided 

 into five segments, the first of which, much the largest, sup- 

 ports the antennae, the ejes, and the jaw-feet. The second and 

 third have each a pair of feet ; the fourth supports the two 

 following pairs, and the fifth the last. Their eyes are small, 

 and not projecting, all the antennae are terminated by a simple 

 filament. 



CONDYLURA, Lat.y 



The lower antennee are much longer ; the anterior sides of 

 the first segment are elongated into a point, and form two 

 shells, or scales, approximating together like a bill ; the feet 

 are terminated in a silky point. Some of the intermediate 

 ones have, as in the Schizopoda, an external appendage near 

 their base. The tail is narrow, composed of seven rings, the 

 last of which, elongated and conical, advances between the 

 two lateral appendages, which are slender, in the form of 

 stylets, with two articulations, the last of which is setaceous. 

 Condylure de Dorhiciny, Lat., on the maritime coasts of La 

 Rochelle. 



Nota. The genus Nicothoe, of MM. Audouin, and Milne 

 Edwards, on the supposition that it has mandibles and jaws, 

 would belong to this section ; but as the crustaceous animal 

 on which it has been established, is parasite, and as I think 

 that I have perceived in it the vestiges of a sucker, I have 



