original description
Yen, T.-C. (1952). Molluscan Fauna of the Morrison Formation. <em>United States Geological Survey Professional Paper.</em> 233-B: 21-51.
page(s): 44, pl. 6, figs 19a-b [details] Available for editors [request]
From editor or global species database
Type locality "Locality 5. Felch's Ranch, Garden Park, 9 miles north of Canon City, Fremont County, Colorado", United States [details]