Only introduced here to fill up the family and keep up the chain of
connexion. It approximates the genus Gryphea.
Shell rather thick, sub-regular, symmetrical, equilateral, inequivalve,
adhering by the extremity of the shorter valve; the other terminated by
a summit pointed, a little recurved and medial; articulation very
angular, by means of two very distant condyles.
FAMILY XIX.
OSTRACEA. Six genera.