Monograph of the Freshwater Univalve Mollusca of the United States, Philadelphia.
1840-1845
S.S. Haldeman
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Monograph of the Freshwater Univalve Mollusca of the United States, Philadelphia. 1840-1845 |
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 Ampullaria, Fig. 1. Ampullaria depressa. Artist: Helen Lawson. |
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More info about Helen Lawson: here
and here.
Images courtesy of The Academy of Natural Sciences, Philadelphia (http://www.acnatsci.org).
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