BIVALVIA. 147 



9. Cardita imbricata, Lamarck. Tab, XXI; fig. 10. 



Venus imbricata, Chen. Conch. Cab., t. vi, t. 30, figs. 314, 315, 1782. 



— Ency. Meth., pi. 274, fig. 4, a, h. 



— IMBRICATA, Gmel. Syst. Nat., p. 3277, No. 34, 1815. 



* — — Lamarck. An. du Mus., t. ix, pi. 32, fig. 1. 



Venericardia — Bronn. Sysf. der Urw., p. 51, pi. 4, fig. 7, 1824. 



— — Desk. Coq. foss. des Env. de Par., t. i, p. 152, pi. 24, figs. 4, 5, 1824. 



Cardita — Nyst. Coq. foss. de Belg., p. 209, No. 167, 1843. 



— — Desk. An. sans Vert, du Bas. de Par., t. i, p. 759, I860. 



Spec. Char. C. Testa crassd, suborhiculatd, cordiformi, siibohligud, incequilaterali ; 

 radiatim costatd costis numerosis, convexis, separatis, imbricato-squamosis ; umhonibus 

 subelevatis obliquis, cordatis ; lunund minima prof undissimd. 



Shell thick and strong, suborbicular, oblique, inequilateral, costated ; ribs numerous, 

 convex, distinctly separated, covered with imbricated nodules ; beaks small, slightly- 

 incurved, and heart-shaped ; lunule minute and deep. 



Diameter, \\ inch. 



Locality. Brackleshara Bay. 



France: Montmirail, Grignon, Courtagnon, &c. {Desk.). 

 Belgium: Poret, Laeken, Gand {Ni/st). 

 Asia Minor: Zafranboli {Desk.). 



This is rare in England, and 1 have seen only one specimen. It is very abundant 

 at Grignon. In these the large oblique tooth of the left valve extends as far as the liga- 

 mental fulcrum, and in perfect specimens this tooth is vertically striated. 



M. Nyst has considered this species in his description as probably identical with 

 Venericardia rotunda, Lea, to which certainly it bears resemblance ; but from the descrip- 

 tion by Lea the ribs of his shell appear to be more thickly imbricated, and his figure does 

 not represent it as so oblique. 



The variety called spissa by D'Orbigny I do not know. 



10. Cardita mitis ? Lamarck. Tab. XXII, fig. 3, a, b. 



Venericardia mitis? Lamarck. An. sans Vert., t. v, p. 611, No. 6, 1805. 



— — ? Desk. Coq. foss. des Env. de Par., t. i, p. 155, pi. 25, 



figs. 9, 10, 1824. 

 Cardita — J. Sow. In Dixon's Geol. of Suss., p. 92, 1850. 



Spec. Char. C. Testa rotundato-subobliqud, crassiusculd, tumidd, cordiformi, incequi- 

 laterali, costatd, costis 23 — 26, in medio Icevigatis, convexis, utroque leviter granosis. 



