MolluscaBase name details
original description
Edwards, F. E. (1849). A monograph of the Eocene Mollusca, or descriptions of shells from the Older Tertiaries of England. First Class. Cephalopoda. <em>Monographs of the Palaeontographical Society.</em> 2 (3): 1-56, pl. 1-9., available online at https://www.biodiversitylibrary.org/page/12893939
page(s): 139; pl. 18 fig. 2e-g [details]