BPANCHIOPODA, 
255 
ova of the females are contained in an elongated capsule, situated 
near the base of the tail in those which are thus terminated, or 
in the posterior extremity of the body and thorax in those which have 
no tail. 
Some are provided with a tail. 
Artemia, Leach. 
Eyes placed on very short pedicles ; the head confounded with an 
oval thorax, furnished with ten pairs of feet, and terminated by a long 
and pointed tail. The antennae short and subulate, 
A. salina; Cancer saliniis, L. ; Montag., Trans. Lin. Soc, 
XI, xiv, 8 — 10; Gammarus salinus. Fab.; Desmar., Consid,, 
p. 393. A small species found in the salt marshes of Lymington, 
in England, when nearly dry, of which as yet we have but a very 
imj^erfect account. 
Branchipus, Lat . — Chirocephalus, B. Prevost, and Jurine. 
Eyes placed on projecting pedicles ; the body narrow, elongated 
and compressed; the head distinct from the trunk, furnished with 
appendages varying according to the sex, and with two appendages 
resembling horns between the eyes ; eleven pair of feet ; the tail 
terminated by two leaflets more or less elongated and edged with 
cilia. 
Although Schaeffer and Benedict Prevost*, have published very 
detailed monographs of two species of this genus, they are still 
imperfect with respect to the profound and comparative study of the 
organs of the mouth, and of some other parts of the head. Considering 
the two sexes together, we find the following general conformation ; 
the body is almost filiform, composed of a head separated from the 
trunk by a kind of neck ; of a trunk or thorax longitudinally hollow 
beneath, divided, at least above, exclusive of the neck, into eleven 
segments, each bearing a pair of branchial, strongly compressed feet, 
usually composed of three foliaceous joints, Avith a fringe of haii's or 
bearded threads along the edges ; and of an elongated tail tapering to 
a point, consisting of nine segments terminated by two more or 
less elongated leaflets fringed with cilia. Under its second segment 
we find the male organ of generation, and in the female an elongated 
sac containing the ova she is ready to produce. In the head avc 
observe, I. Two reticulated eyes situated at the extremity of two 
flexible peduncles formed by lateral prolongations of the head ; 
2. Two antennae at least, frontal, scarcely longer than the head, 
slender, filiform, and composed of very small joints ; 3. Two projec- 
tions under them, sometimes resembling a uniarticulated horn, and 
at others digitiform — the premier doigt des mains, Bened. PreA’ost — 
and biarticulated ; 4. A mouth underneath, composed of two kinds 
of dentated mandibles without palpi, and of some other parts. M'^e 
suspect that these horn-like projections are mei’ely an appendage, 
larger and differently formed in the males, of the frontal antennee ; 
* sur le Chirocephalc printed at the end of the Hist, des Monoc. of the 
late Lewis Jurine, and previously published in the Journal de Physique. 
