ORDER BRANCHIOPODA. 
355 
have observed, towards the middle of the fifth pair of feet, and 
of the four following, a globular body, analogous perhaps to 
the vesicles which these organs present in the following sub- 
genus, that of Apus. 
The only known species, Enlimene blanchatre, Latr. Regne 
Animal, par M. Cuvier, iii. p. 68 ; Nouv. Diet. dTIist. Nat. x. 
p. 333 ; Desmar. Consid. p. 353, 354 ; is very small, whitish, 
with the eyes and the posterior extremity of the tail blackish. 
It is found in the river Nice. 
The others, and last phyllopa, Aspidiphora, Latr., have 
sixty pairs of feet, all furnished externally, near their base, 
with a thick ovaliform vesicle, and the two anterior of which, 
much larger and branching, resemble antennse ; a large testa, 
covering the major portion of the upper part of the body, 
almost entirely free, clypeiform, emarginated posteriorly, sup- 
porting anteriorly, on a circumscribed space, three eyes, sim- 
ple, sessile, and the anterior two larger and lunulated ; and 
two bivalve capsules, enclosing the eggs, and annexed to the 
eleventh pair of feet. These characters distinguish 
Apus, Scop., 
Which form a part of the genus Binoculus of Geoffroy , and 
of that of Limulus of Muller. 
Their body, including the testa, is ovaliform, broader, and 
rounded before, and narrowed posteriorly, in the manner of 
a tail. But, when we do not include the testa, but consider 
the body naked, it is at first almost cylindrical, convex above, 
concave and divided longitudinally by a furrow underneath, 
and afterwards terminates like an elongated cone. It is com- 
posed of thirty rings, diminishing much in size towards the 
posterior extremity, and which, with the exception of the last 
seven or eight, support the feet ; the first ten are membra- 
naceous, soft, without spines, present on each side a small 
eminence, in the shape of a button, and have each but one 
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