MolluscaBase name details
original description
Worthen A.H. (1890). Part 2. Palaeontology of Illinois. Section 1. Description of fossil invertebrates. In: Lindahl, J. Geological Survey of Illinois. Volume 8. Geology and Palaeontology. Springfield, The Legislature of Illinois. 69-154., available online at https://www.biodiversitylibrary.org/page/19708197
page(s): 141, pl. 25, figs. 7 and 7a [details]