This genus was separated by Lamarck from the Donax on account of the
peculiarity of the hinge.
Capsa lævigata.
Capsa Braziliensis.
_C. lævigata._ The smooth Capsa.
Triangular, sub-equilateral, obsoletely striated transversely; covered
with a greenish yellow epidermis; inside violet towards the umbones.
_C. Braziliensis._ The Brazilian Capsa. Pl. 8, fig. 7.
Shell elongated, covered with epidermis; equivalve, close; the cardinal
teeth reduced to one large sub-bifid tooth on the right valve, placing
itself between two very thin ones on the left; ligament external, on the
short side.