basis of recordPilsbry, H. A. & Ferriss, J. H. (1906). Mollusca of the Southwestern States. II. <em>Proceedings of the Academy of natural Sciences of Philadelphia.</em> 58: 123-160 [20 June 1906], 161-175, pls 5-9 [24 July 1906]., available online athttps://www.biodiversitylibrary.org/page/24706972 page(s): 162 [details]