noun
egg cowrie; shuttle shell
A marine gastropod (Ovula ovum) with a white, egg-shaped shell. The name literally means 'sea rabbit'.
ウミウサギは白くて卵のような形の貝です。
The egg cowrie is a white, egg-shaped shell.
沖縄の海でウミウサギを見つけました。
I found an egg cowrie in the sea off Okinawa.