original description
Conrad, T. A. (1864). Notes on Shells, with descriptions of new fossil Genera and Species. <em>Proceedings of the Academy of Natural Sciences of Philadelphia.</em> 16: 211-214., available online at https://www.biodiversitylibrary.org/page/26360835
page(s): 213, textfig. [details]
source of synonymy
Clark, W.B. (1896) The Eocene deposits of the middle Atlantic slope in Delaware, Maryland and Virginia. United States Geological Survey, Bulletin, 141, 1–167.
page(s): 78 [details]
From editor or global species database
Type locality "Six miles east of Washington, D.C." (Maryland) [details]