Descrição original: Jeffreys, J. G. (1884). On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ expeditions 1868-70 (Part VII). Proceedings of the Zoological Society of London. 1884: 111-149, pl. 9-10., available online at http://www.biodiversitylibrary.org/page/28689962page(s): 135; pl. 10 fig. 7