Ihering, H.v. 1912. Analyse der süd-amerikanischen Heliceen. Journal of the Academy of Natural Sciences 15 (2nd series): 475-500. https://www.biodiversitylibrary.org/page/33245421#page/699/mode/1up.
Ihering, 1912. Jour. Acad. Nat. Sci. 15: 489, pl. 42, figs. 20-23.