This genus was at first classed by Lamarck with the Lucina; but Cuvier,
having discovered that the organization of the animals differed, made
this a distinct genus, which was adopted by Lamarck.
Shell transverse, equivalve, no flexuosity; apices curved inward,
opposed to each other; two primary and two lateral teeth, the posterior
one nearest to the hinge; muscular impression simple, valves sometimes
convex, strongly ribbed transversely, striated longitudinally, margins
serrated and closely interlocking.
_C. fimbriata._ The fringed Corbis. Pl. 8, fig. 1.
Species white, rather thick, oval, a little elongated, almost
equilateral; the cardinal and the lateral teeth well marked; the
muscular impression anterior, rounded.