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From The Collaborative International Dictionary of English v.0.48:
Fissurella \Fis`su*rel"la\, n. [NL., dim. of L. fissura a fissure.] (Zool.) A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet. [1913 Webster]