258 
CRUSTACEA. 
and cylindrical peduncles. There are eleven pairs of branchial feet, 
the three first joints and the last small and tapering; directly after 
them follows a terminal and nearly semiglobular piece replacing the 
tail, and from which issues an elongated thread, that, perhaps, is an 
oviduct. Near the middle of the fifth pair of feet, and of the four 
following ones, I have remarked a globular body, possibly analogous 
to the vesicles presented by these organs in the following sub- 
genus. 
The only species known, Eulimene blanchdtre, Lat., Regne 
Animal, Cuv., Ill, p. 68; Nouv. Diet. d’Hist. Nat. X, 333; 
Desman, Consid., p. 353, 354, is very small; whitish eyes, and 
posterior extremity of the body blackish. From the vicinity of 
Nice. 
The remaining Phyllopa — Aspidiphora, Lat. — have sixty pairs of 
feet, all furnished externally near their base with a large oval vesi- 
cle *, and the two anterior of which, although much larger and ram- 
ous, resemble antennae ; a large shell, covering the greater part of 
the superior portion of the body, almost entirely free, clypeiform, 
emarginated posteriorly, provided anteriorly in a circumscribed space 
with three simple, sessile eyes, the two anterior of which are largest 
and lunated ; and two bivalve capsules containing the ova, and an- 
nexed to the eleventh pair of feet. Such are the characters which 
mark the 
Apus, Scop., 
Which makes part of the genus Binoculus, Geotf,, and of the Li- 
mulus, Muller. 
The body, including the shell, inclines to an oval, wider and more 
rounded before, and narrowed behind in the manner of a tail ; ab- 
stracting the shell, it is at first nearly cylindrical, convex above, 
concave and divided longitudinally beneath by a furrow, and termi- 
nates in an elongated cone. It consists of thirty annuli, which are 
considerably smaller at the posterior extremity, and which, the last 
seven or eight excepted, give origin to the feet. The first ten are 
membranous, soft, without spines, exhibit a small button-like promi- 
nence on each side, and have each but a single pair of feet. The 
others are more solid or horny, with a range of small spines on the 
posterior margin ; the last is larger than the preceding ones, nearly 
square, depressed, angular, and terminated by two articulated threads 
or setae. In some S2:)ecies composing the genus Lepidurus, Leach, 
a horny, flattened, and elliptical lamina is seen between them. If the 
number of feet be about a hundred and twenty, the last annuli, be- 
ginning with the eleventh or twelfth, must necessarily have more 
than one pair, a circumstance which in this respect approximates 
these Crustacea to the Myriapoda. The shell, perfectly free from 
its anterior adhesion, invests a great part of the body, and thus 
protects the primary segments, which, as already stated, are softer 
* Possibly analogous to the vesicles forming the second joint of the feet of the 
Daphniae. 
