Jeffreys, J. G. (1883). On the Mollusca procured during the 'Lightning' and 'Porcupine' expeditions 1868-70. (Part VI). <em>Proceedings of the Zoological Society of London.</em> 1882: 88-115, pl. 19, 20., available online athttp://www.biodiversitylibrary.org/page/28679878 page(s): 101, pl. 20 fig. 7 [details]
original descriptionJeffreys, J. G. (1883). On the Mollusca procured during the 'Lightning' and 'Porcupine' expeditions 1868-70. (Part VI). <em>Proceedings of the Zoological Society of London.</em> 1882: 88-115, pl. 19, 20., available online athttp://www.biodiversitylibrary.org/page/28679878 page(s): 101, pl. 20 fig. 7 [details]