Ulrich, E. O.; Scofield, W. H. (1897). The Lower Silurian Gastropoda of Minnesota. <em>The Geology of Minnesota.</em> 3(2): 813-1081, pls. 61-82., available online athttps://www.biodiversitylibrary.org/page/14923788 page(s): 853, 922 [details]
original descriptionUlrich, E. O.; Scofield, W. H. (1897). The Lower Silurian Gastropoda of Minnesota. <em>The Geology of Minnesota.</em> 3(2): 813-1081, pls. 61-82., available online athttps://www.biodiversitylibrary.org/page/14923788 page(s): 853, 922 [details]
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