C. flexuosa.

C. macrodon.

C. lunularis.

C. squamosa.

C. lunaris.

C. cardilla.

C. cygnus.

C. dentaria.

C. Chione. The Chione Cytherea.

Thick, solid, heart-shaped, covered with a smooth brown epidermis, beneath which the shell is of a beautiful purple; radiated longitudinally, faintly wrinkled transversely, anterior cardinal tooth entire, and without a striated canal; apex turned sideways, with a cordiform depression.