A Monograph of the Limniades and Other Freshwater Univalve Shells of North America (Classic Reprint) - Tapa blanda

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Excerpt from A Monograph of the Limniades and Other Freshwater Univalve Shells of North America

Shell conoid, whirls convex, modifying the spiral cavity: aperture ovate or subrotund, widest anteriorly, the margins united, sharp, and never reflected: aperture closed with a thin corneous Opercle, of which the lines of increase are generally concentric.

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