BRANCHIOPODA. 241 



The Monoculus tauras. Slabber, Microsc. V, and tlie Cancer 

 germatius, L., appear to be allied to it *. 



Nebalia, Leach. 



Triangular, flattened eyes, partly covered by a triangular and 

 arched scale. 



The feet are forked, and the terminal appendages of the tail seta- 

 ceous f. 



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. 



CONDYLURA, Lat. 



The inferior antennae 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 in- 

 termediaries, as in the Schizopoda, Avith an external appendage near 

 the base ; the tail narrow and formed of seven aimuli, 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 J. 



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 



* See the Hist. Nat. des Crust, et des Insect,, of Latreille, and the work of 

 Desmarest on the Crustacea. This genus has not yet been completely described, 

 and we have not been able to procure a single specimen of it. 



f Nebalia Herbstii, Leach, Zool. Miscell., XLV; Desmar., Consid., XL, 5; 

 Rand., Monoc. 1, 8.' 



The Nebalie ventrue. Risso, Journ. de Phys., Octob. 1822, probably forms a 

 peculiar subgenus in the section of the Schizopoda. la the Cyclops exiliens, Viviani, 

 the thorax is divided into several segments, a circumstance which excludes it from 

 the Nebaliae. It also forms a new subgenus intermediate between the preceding and 

 following one. 



N.B. Anew species of this genus, the N. Geoff. Saint-Hil., lb., XV, 1, has 

 been very minutely described by Milne Edwards. The head is terminated anteriorly by 

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

 the superior antennre are inserted under them, and the second joint of the peduncle 

 is furnished with a lamina ; the mouth is surrounded with three pairs of appendages, 

 which appear to correspond in their progressive order to the palpigerous mandibles 

 and four jaws of the Crustacea Decapoda ; beneath are placed five pairs of foliaceous 

 and ciliated lamince which appear to be branchial, and further 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 men- 

 tioned 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 Nebaliae must be referred to 

 the last section of the Decapoda Macroura. 



X Condylura Dorhigni, Lat. From the sea coast of Rochelle. 



VOL. in. K 



