This genus of shells is very numerous in all seas, but chiefly in hot countries, where they are found of a larger size; they generally adhere by their base to rocks, stones, and marine substances, from which it is difficult to detach them.
Shell oval or circular, sub-conic; summit right or more or less recurved anteriorly; the cavity simple, entire, more or less deep; the margin complete and entirely horizontal; a narrow muscular impression.
Patella apicina.
P. granatina.
P. oculus.
P. barbara.
P. plicata.
P. laciniosa.
P. saccharina.
P. angulosa.