Formerly considered a Patella, but distinct from it on account of having
an operculum. It is particularly distinguished by having two teeth at
the base of the right side.
Shell wide, rough, oval, spire very short, not projecting; aperture very
large, oval, effuse, sloped anteriorly; the edges united; the right or
external very thick, dentated; the two teeth which limit the slope are a
little larger than the others; muscular impression visible, and almost
in form of a horseshoe; operculum horny and rudimentary.
_C. Peruvianus._ The Peruvian Concholepas. Pl. 28, fig. 1.
The type of this genus; exterior dark brown, interior white.