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From The Collaborative International Dictionary of English v.0.48:
Turritella \Tur`ri*tel"la\, n. [NL., dim fr. L. turris tower.] (Zool.) Any spiral marine gastropod belonging to Turritella and allied genera. These mollusks have an elongated, turreted shell, composed of many whorls. They have a rounded aperture, and a horny multispiral operculum. [1913 Webster]