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DIMYARIA.—CYPRINADÆ.
cor; it ranks among the largest of our Mollusca, being sometimes found nearly three inches in length, and the same in breadth and thickness. It is of an uniform dark brown or liver-colour.
HEART-SHELL.
The following interesting account of the animal and its habits was communicated by the Rev. James Bulwer to the second volume of the "Zoological Journal." "Mantle completely lining the shell, double at the outer edge; exterior fold divided in front, open at each end; at the posterior end forming two short siphons or tubes, ciliated at the upper orifices; colour, yellowish white; margin, orange. Foot very muscular, broad, triangular, compressed, pointed, orange. Branchiæ external, concealed between the
