basis of recordJohnson, C. W. (1899). New and interesting species in the "Isaac Lea collection of Eocene Mollusca". <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 51: 71-82, pls. 1-2., available online athttps://www.biodiversitylibrary.org/page/6389238 page(s): 77, pl. 2, fig. 5 [details]
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