CONCHIFERA. 733 



sec. SeVie, in. 1835, pp. 193 213, PL vm. ; CANTRAINE, who places this 

 genus, on account of the mantle for the most part united, not in this family, 

 but in Byssomya, names it Mytilina. Ann. des Sc. nat., sec. SeYie, vn. pp. 

 302 312. It agrees, however, very closely with Mytilus, as well in the 

 shell as in the animal. 



Family VI. Arcacea. Mantle cloven anteriorly, not produced 

 into a trachea. Foot large, in some serving for creeping, in others 

 furnished with byssus horny, lamellose, not divided into filaments. 

 Branchiae composed of loose filaments. Shell regular, with points 

 remote. Hinge with numerous teeth arranged in a row. Two 

 muscular impressions remote. 



Area L. (in part). Hinge linear, straight. Shell transverse, 

 nequilateral, with points distant, a large area intervening. Animal 

 Daphne POLI) with foot compressed, cloven longitudinally, mostly 

 idhering by means of lamellose, horny byssus to marine bodies. 



Sp. Area Noce L., HUMPH. Ami. Raritcitlc. Tab. 44, fig. p, Encycl. metJi., 

 Vers. PI. 303, BLAINV. Malacol. PL 65, fig. 2 ; in the Mediterranean and 

 the Atlantic; the Noah's Arc; the boat-like form occasioned the generic 

 name. Area tortuosa L., EUMPH. 1. 1. Tab. 47, fig. K, Encycl. meth., Vers. 

 PI. 305, fig. i, BLAINV. Malac. PL 65 bis, fig. i, from the Indian Ocean, 

 &c. A very numerous genus, of which also fossil species occur, some in 

 secondary, but the most in tertiary formations. 



Cucullcea LAM. Shell ventricose. Hinge terminated at each end 

 by ribs exsert, parallel to the margin, various in number. 



Sp. Area cucullus GMEL., Cucullcea auriculifera LAM., BLAINV. Malac. PL 

 65, fig. 4; from the Indian Ocean. The fossil species of this small group 

 are the more numerous, since amongst the animal world now living, only 

 this single one is known. 



Pectunculus LAM. (Species of Area L.). Shell orbicular, thick, 

 shut. Hinge arcuate, with teeth oblique, the median obsolete. 

 Animal (Axincea POLI) with foot hatchet-shaped, serving for creep- 

 ing, very large, compressed, not byssiferous ; heart single. 



Sp. Pectunculus pilosus LAM., Area pilosa L. (and glyclmeris in part), Bo- 

 NANNI Recreat. Mentis et Oculi, Romse, 1684, fig. 80, POLI Test. utr. Sic. 

 Tab. 26, figs. 2, 3, GUERIN Iconogr., Moll. PL 27, fig. 6, DESHAYES Con- 

 chyl. PL 34, figs. 23, 24 1 ; Pect. glycimeris LAM., DESH. L 1. figs. 21, 22, 



1 The shells of this species are used by the Sicilians, according to the account of 

 POLI, for making cameos. 



