 Crepidula plana

Crepidula plana, common name the eastern white slippersnail, is a species of sea snail, a marine gastropod mollusk in the family Calyptraeidae, the slipper snails or slipper limpets, cup-and-saucer snails, and hat snails.This species is characterized by a flat white shell, a white body, and development that includes a planktotrophic larval stage.