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Pvn H,i I'UitlS

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CYPRINA. 303<br />

paring the beaks to a ram's horns. Knorr,<br />

in his<br />

f<br />

DeliciaB Naturae selectse/ says<br />

"<br />

coeur de boeuf," and in Holland " zots-kappen " or<br />

fool's-cap.<br />

it is called in France<br />

It is the Bucardia communis of Schumacher and Iso-<br />

cardia Hibernica of Reeve.<br />

Genus II. CYPBTNA * Lamarck. PL VI. f. 2.<br />

Body suborbicular and fleshy : mantle rather thick, slightly<br />

retractile ; edge finely serrated : tubes extremely short, but<br />

separate ;<br />

orifices cirrous :<br />

foot large<br />

and extensile.<br />

Shell heart-shaped, convex, concentrically striated: epidermis<br />

thick and fibrous : beaks incurved : hi aide and corselet<br />

: wanting ligament almost wholly external : teeth,<br />

in each valve<br />

three cardinals, the outer one laminar, besides a single lateral<br />

on the posterior side.<br />

We now approach the boundaries of the Venerid7rpjs\ one of the names of Venus.

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