118 CRUSTACEA. 



There, the thorax or the shell, viewed from above, is divided into 

 five segments, of which the first is much the largest and has the an- 

 tennae, eyes, and foot-jaws attached to it; the second and the third 

 have each one pair of feet, the fourth has the two following pairs, 

 and the fifth, the last. The eyes are small and not prominent; all 

 the antennae are terminated by a single thread. 



CoNDVLURA, Lat. 



The inferior antenns longest; the anterior sides of the first seg- 

 ment prolonged into a point forming two scales approximated into 

 a kind of rostrum; feet terminating in a silky point; some of the 

 intermediaries, as in the Schizopoda, with an external appendage 

 near their base; the tail narrow and formed of seven annuli, the last 

 of which, conical and elongated, projects between the two lateral 

 appendages that are slender, styliform, and composed of two joints, 

 the last silky (1). 



We should remark, that the genus Nicothoe of MM. Audouin 

 and Milne Edwards, by admitting it to have mandibles and jaws, 

 would belong to this section; but as the animal on which it is founded 

 is parasitical, and, as I think I perceived in it a vestige of a sucker, I 

 have placed it among the Poecilopoda. I would observe, however, that 

 the feet, the anterior excepted, closely resemble those of Cyclops, 

 and that the females also carry their ova in two sacs situated at the 

 base of the tail as in the latter genus(2). 



a rostrum articulated at base, or movable and pointed; the eyes are pedunculated; 

 the superior antennae are inserted under them, and the second joint of their pe- 

 duncle is furnished with a lamina; the mouth is surrounded witii three pairs of ap- 

 pendages whicli appear to us to correspond in their progressive order to the pal- 

 pigerous mandibles and four jaws of the Crustacea Decapoda; beneath are placed 

 five pairs of foliaceous and ciliated lamins which appear to be brancliial, and fur- 

 ther down are four pairs of bifid and natatory feet; the abdomen is composed of 

 seven annuli, the first of which support two small rudimental filaments; the last is 

 terminated by two elongated stylets furnished with long hairs. As it is extremely 

 probable that there is, as usual, another pair of feet, the two inferior and branchial 

 appendages above mentioned, may very well represent that pair. In the other 

 appendages we should find foot-jaws and the parts of the ligula; in that case the 

 Nebalis must be referred to the last section of the Decapoda Macroura. 



(1) Condylura DorbigJii, Lat. From the sea coast of Uochelle. 



(2) Near the Condylurs should be placed the genus Cuma, M. Edwards, Ann. 

 <ies Sa Nat. Xlll, xiii, B. The superior antennae are rudimental, and consist of 

 but one joint. The head is distinct from the thorax which is divided into four seg- 

 ments, to the first of which are attached the four anterior feet, each of the follow- 

 ing having a p'air; .ill these feet are natatory, directed forwards, and have no hook 

 at the end; the two first pairs alone are bifid. 



