original description
Meek, F.B. (1873). Preliminary paleontological report, consisting of lists and descriptions of fossils, with remarks on the ages of the rocks in which they were found, etc., etc. <em>United States Geological and Geographical Survey of the Territories, annual report.</em> 6: 431-541., available online at https://www.biodiversitylibrary.org/page/15677973
page(s): 512-513 [details]
additional source
Henderson, J. (1935). Fossil non-marine Mollusca of North America. <em>Geological Society of America Special Papers.</em> 3: 1-313.
page(s): 108 [details] Available for editors [request]
From editor or global species database
Type locality "Black Butte Station, Wyoming, upper beds. Bitter Creek series", USA; Lance Fm., Maastrichtian, Late Cretaceous [details]