egg cowrie; shuttle shell
A marine gastropod (Ovula ovum) with a white, egg-shaped shell. The name literally means 'sea rabbit'.
The egg cowrie is a white, egg-shaped shell.
I found an egg cowrie in the sea off Okinawa.
Katakana spelling is common for this animal name.
Kanji spelling is rare; the word is usually written in kana.
Compound of 海 (umi, 'sea') and 兎 (usagi, 'rabbit'), from the shell's resemblance to a rabbit.