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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.