152 EOCENE MOLLUSCA. 
the ribs, which in this species are free from imbrications, nodules, or rugosities of any 
kind, rather a rare circumstance with species in this genus. 
Fig. 12 of the same plate represents a specimen from High Cliff, Barton, which, I 
think, may be considered a variety of this species; it has fewer ribs and wider spaces, 
bat it is equally unarmed. 
16. Carpira sutcata, Solander. Tab. XXII, fig. 1, a, 6. 
CuaMa suLcara, Sol. (in Brander). Foss. Hanton., pl. 7, fig. 100, 1776. 
VENERICARDIA COR-AVIUM, Lamarck. An. du Mus., t. vii, p. 58, No. 7, 1806. 
_ — Desh. Cog. foss. des Env. de Par., t. i, p. 156, pl. 24, 
figs. 6—8, 1824. 
— aLoBosa, J. Sow. Min. Conch., t. 289, fig. 1, 1821. 
Carpita cor-avium, d’Orb, Prod. de Paleont., t. 11, p.423, No. 1613, 1850. 
—  suLcata, Id. 55 9 o 
—_— —_ Desh. An. sans Vert. du Bass. de Par., t. i, p. 768, 1858. 
Spec. Char. C. Testa rotundato-globosd, cordiformi, turgidd, inequilaterali, radiatim 
costatd, costis 16—20, elevatis, rugosis, convexis, imbricato-squamosis vel nodulosis ; lunulé 
lata, profunda ; umbonibus tncurvis. 
Shell roundly globose, heart-shaped, tumid, inequilateral; costated, ribs 16—20, 
elevated, convex, and rugose, covered with coarse imbrications or nodules; lunule broad 
and deep ; beaks incurved. 
Diameter, } of an inch, nearly. 
Locality. Barton. 
France: Ezanville, &c., Sables moyens (Deshayes). 
Prof. Morris and M. Deshayes have both, and I think very justly, restored to this 
species the name originally given to it by Solander. Probably Lamarck was not aware 
that his species had been found in England, or had been figured and described in an 
English work. TUche 
This is most abundant as individuals, at Barton, where it may be considered as one of 
the characteristic species of that deposit. The reason why this appears not to have been 
referred to cor-avium by Mr. Sowerby was a difference in the hinge between the French 
and English shells; but this is a variation that may be observed among a large suite of 
specimens of the British fossil, which will be found to exhibit the broad hinge as well as 
the narrow one, and I believe with the above-mentioned authors that they constitute but 
one species. ‘l'here is a variety at the same locality which differs in having the ribs more 
distinctly covered with nodules, whereas in the typical form the ribs are more rugose and 
without distinct tubercles. Var. B of J. Sowerby makes an approach towards C. 
PDavidsoni, in which the ribs are sharper. 
