AS Atrina alfredensis Bartsch
Shell depressed pyriform; horn colored, darker at the tip. The interior is dull horn colored, excepting the tip, which is smoky pearly. Upper side slightly curved; the ventral edge decidedly concave; posterior portion decidedly expanded. The surface is marked with five poorly developed and poorly expressed radiating ridges beset with decidedly elevated squamations, which are strongest on the three median ridges. The ventral border is rendered rasp-like by fine poorly developed squamations.
The type and another specimen, Cat. No. 227815, U.S.N.M., come from Port Alfred (Coll. No. 910). The type measures: Length, 73 mm.; greater diameter, 50 mm.