original description
(of Helix evanstonensis C. A. White, 1878 †) White, C.A. (1878). Paleontological Papers No. 6: Descriptions of new species of invertebrate fossils from the Laramie Group. <em>Bulletin of the United States Geological and Geographical Survey of the Territories.</em> 4: 707-719., available online at https://www.biodiversitylibrary.org/page/31549803
page(s): 714 [details]
basis of record
Hartman, J.H.; Roth, B. (1998). Late Paleocene and Early Eocene Nonmarine Molluscan Faunal Change in the Bighorn Basin, Northwestern Wyoming and South-Central Montana. In: Aubrey, M.-P.; Lucas, S.G.; Berggren, W.A. (eds) Late Paleocene–Early Eocene Biotic and Climatic Events in the Marine and Terrestrial Records. Columbia University Press, pp. 323-379.
page(s): 325 [details]
From editor or global species database
Classification Genus attribution uncertain. [details]