Meek, F. B.; Worthen, A. H. (1866). Descriptions of invertebrates from the Carboniferous System, Illinois. <em>Geological Survey of Illinois.</em> 2: 145-411., available online athttps://www.biodiversitylibrary.org/page/40446334 page(s): 362 [details]
original descriptionMeek, F. B.; Worthen, A. H. (1866). Descriptions of invertebrates from the Carboniferous System, Illinois. <em>Geological Survey of Illinois.</em> 2: 145-411., available online athttps://www.biodiversitylibrary.org/page/40446334 page(s): 362 [details]