Descrição original: Montagu, G. (1808). Supplement to Testacea Britannica with Additional Plates. Woolmer, Exeter. v + 183 pp., pl. 17-30. , available online at https://www.biodiversitylibrary.org/page/61685744page(s): 102-104, Pl. 30 fig. 4., not Pl. 23 fig. 6