BRANCHIOPODA. 241 
The Monoculus iauras, Slabber, Microsc. V, and the Cancer 
yermanus, 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, with an external appendage near 
the 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 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. In 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 speeies of this genus, the N, Geoff. Saint-Hil., Ib., 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 antennae 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 laminae 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 ease the Nebaliae must be referred to 
the last section of the Decapoda Macroura. 
* J Condylura Dorbigni, Lat. From the sea coast of Rochelle. 
VOL. III. 
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