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The Shield Snails. River Limpets

Genus ANCYLUS, Geof.

Shell patelliform, not spiral, thin; apex sinistral; jaws, three; radula broad, crowded with teeth; foot large; mantle included; tentacles triangular; pulmonary orifice protected by a flap.

A. rivularis, Say, has a horny, opaque shell, with blunt, sub-central apex. The large, oval aperture narrows at one end. Lining white. This is found adhering to stones in rivulets. Length, 1/4 inch.

Habitat.-Massachusetts, Virginia, Wisconsin.

A. Newberryi, Lea, is a large blunt dome, smoky red, with sides somewhat compressed, making an elliptical aperture. This is easily the largest species in the genus. Length, 1 inch.

Habitat.-Lake Klamath, Cal,