Length 22 mm, height 19 mm, breadth 11 mm. Shell rather thin, oval, oblique. Beaks low, eroded, below the hinge line. Anterior and ventral margins gently round with obliquely protruded postero-ventral corner. Ligamental area narrow, triangular. Cardinal teeth 8─10 on both sides of hinge plate. Surface with thick, hairy periostracum. Interior white. Ventral margin smooth.
Distribution:
Massachusetts to North Carolina, off Suriname and Indian Ocean. Bathyal to abyssal (down to 4,000 m).