boat-shell
Boat" shell` (. (Zoöl.) (a) A marine gastropod of the genus Crepidula. The species are numerous. It is so named from its form and interior deck. (b) A marine univalve shell of the genus Cymba.
Boat" shell` (. (Zoöl.) (a) A marine gastropod of the genus Crepidula. The species are numerous. It is so named from its form and interior deck. (b) A marine univalve shell of the genus Cymba.