Rose Petal Bubble Shell - Hydatina physis

Hydatina physis is a species of sea snail, a bubble snail, a marine opisthobranch gastropod mollusk in the family Aplustridae. Its common names include striped paper bubble, green-lined paper bubble, brown-lined paper bubble, and rose petal bubble shell.

This was a large specimen. They have white margins on the mantle and the two tiny black dots are the eyes.