Grandicrepidula grandis

Grandicrepidula grandis, common name : the giant slipper limpet, 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 Chinese hat snails.

Distribution
This species is distributed in the Pacific Ocean along Japan and the Aleutians.