258 CRUSTACEA. 



and cylindrical peduncles. There are eleven pairs of branchial feet, 

 tlie 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, Eidimene blanchdtre, Lat., Regne 

 Animal, Cuv., Ill, p. 68; Nouv. Diet. d'Hist. Nat. X, 333; 

 Desmar., Consid., p. 353, 354, is very small; whitish ejes, 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, clypciform, 

 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, Geoff,, and of the Li- 

 mulus, Miiller. 



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 species 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. 



