basis of recordJeffreys, J. G. (1884). On the Mollusca procured during the 'Lightning' and 'Porcupine' expeditions, 1868-70. (Part VIII). <em>Proceedings of the Zoological Society of London.</em> 1882: 341-372, pl. 26-28., available online athttp://www.biodiversitylibrary.org/page/28690228 page(s): 368, pl. 28 fig. 3 [details]