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The Collaborative International Dictionary
Boat shell

Boat shell \Boat" shell`\ (Zo["o]l.)

  1. A marine gastropod of the genus Crepidula. The species are numerous. It is so named from its form and interior deck.

  2. A marine univalve shell of the genus Cymba.

Wiktionary
boat shell

n. 1 (context zoology English) A marine gastropod of the genus (taxlink Crepidula genus noshow=1). The species are numerous. 2 (context zoology English) A marine univalve shell of the genus (taxlink Cymbium genus noshow=1), syn. (taxlink Cymba genus noshow=1).