Illustrated Index of British Shells / Containing figures of all the recent species

by G. B. Sowerby

Cyprina.

Fig.

01. C. islandica, Linn. (Venus.)—C. vulgaris, V. mercenaria.—Brit. co. generally, most abundant north, 5 to 80 fath. Oval, with thick epidermis.

Circe.

02. C. minima, Mont. (Venus.)—Gen. Cyprina and Cytherea triangularis, apicialis, Cyrillii, minuta.—Guernsey, Cornwall, Milford Haven, Clyde, Bantry Bay, etc., 10 to 50 fath., C.

Isocardia.

03. I. cor, Linn. (Chama.)—I. hibernica, Cardita cor.—Dublin, Skye, etc., Mc. Heart-shaped, beaks coiled.

Cardium, or Cockle.

04. C. pygmæum, Donovan.—C. exiguum.—Herne, Sark, Weymouth, Zetland, Bantry Bay, 5 to 50 fath., Mc. Hinder side large, angular.

05. C. papillosum, Poli.—Guernsey, St. Martin's Port, Jeffreys, R. Rather rounded, equally ribbed and grained.