basis of recordJeffreys, J. G. (1856). On the marine Testacea of the Piedmontese coast. <em>Annals and Magazine of Natural History.</em> ser. 2, 17: 155-188., available online athttp://biodiversitylibrary.org/page/22069750 page(s): 188, pl. 2 fig. 18-19 [details]