Descrição original: Jeffreys, J. G. (1883). On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ expeditions 1868-70. (Part VI). Proceedings of the Zoological Society of London. 1882: 88-115, pl. 19, 20., available online at http://www.biodiversitylibrary.org/page/28679878page(s): 92, pl. 19 fig. 3