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Pilsbry, H. A. (1930). Anatomy and relationships of some American Helicidae and Polygyridae. Proceedings of the Academy of Natural Sciences of Philadelphia. 82: 303-327, plate 23-27.
Pilsbry, H. A. (1930). Anatomy and relationships of some American Helicidae and Polygyridae. Proceedings of the Academy of Natural Sciences of Philadelphia. 82: 303-327, plate 23-27.
