Publisher's Synopsis
Excerpt from A Monograph of the Freshwater Univalve Mollusca of the United States: Including Notices of Species in Other Parts of North America
Gasteropodous monoicous indperculate pneumobranchiate testaceous aquatic mollusca'; having a single pair of triangular or filiform contractile tentacles, the surface of which is covered with vibrillae, * and having the eyes at their internal base: the shells are thin in tex ture, of uniform tints, and with the margin of the aperture sharp.
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