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G. W.  Tryon, Manual of conchology, structural and systematic : with illustrations of the species. by George W. Tryon, Jr. Second series, Pulmonata, vol. 24. Philadelphia: , 1916, p. 380.

G. W.  Tryon, Manual of conchology, structural and systematic : with illustrations of the species. by George W. Tryon, Jr. Second series, Pulmonata, vol. 23. Philadelphia: , 1915, p. 380.