Shell ovate, smooth, nearly cylindrical, scarcely broader than the truncate, widely open mouth. Pores numerous, irregular, roundish, of very different sizes. Three lateral wings arising from the middle zone, twice as long as the shell, straight, divergent, stout, cylindrical, longitudinally striped.
Dimensions.-Shell 0.08 long, 0.06 broad; wings 0.15 long.
Habitat.-Central Pacific, Station 272, depth 2600 fathoms.