138 CRUSTACEA. 



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(l), and the two anterior of which, although much larger and 

 ramous, 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 annexed 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 prominence 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 arti- 

 culated threads or setae. In some species composing the genus Lepi- 

 DURUs, 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, beginning with the eleventh or twelfth, must necessarily 

 have more than one pair, a circumstance which in this respect ap- 

 proximates 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 than the others. It consists of a large, horny, extremely thin, 

 and almost diaphanous scale or plate, which represents the superior 

 teguments of the head and thorax united, and forming a large, oval, 

 convex shield, angularly notched and dentated at its posterior ex- 



(1) Possibly analogous to the vesicles forming the second joint of the feet of 

 the Daphniae. 



