FissurellaFis`su*rel"la\, n. [NL., dim. of L. fissura a fissure.] (Zo["o]l.) A genus of marine gastropod mollusks, having a conical or limpetlike shell, with an opening at the apex; -- called also keyhole limpet.
|type genus of the family Fissurellidae: keyhole limpets|