- A marine gastropod of this genus Crepidula. The species are numerous. It's so-named from its form and interior deck.
- A marine univalve layer of this genus Cymbium, syn. Cymba.
- The English title of shells associated with genus Cymbium or Cymba, of the family Volutidæ. See cut-under Cymbium.
- the most popular slipper-limpet or half-deck, Crepidula fornicata.
- A marine gastropod associated with the genus Crepidula. The types are numerous. It really is so-named from its form and interior deck.
- A marine univalve shell associated with genus Cymba.
Cross Reference for "boat shell"
- boatswain's chair
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