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Pilsbry, H. A. (1930). Results of the Pinchot South Sea Expedition - I. Land mollusks of the Caribbean Islands, Grand Cayman, Swan, Old Providence and St. Andrew. Proceedings of the Academy of Natural Sciences of Philadelphia. 82: 221-261, pls 15-19. Philadelphia.
Pilsbry, H. A. (1930). Results of the Pinchot South Sea Expedition - I. Land mollusks of the Caribbean Islands, Grand Cayman, Swan, Old Providence and St. Andrew. Proceedings of the Academy of Natural Sciences of Philadelphia. 82: 221-261, pls 15-19. Philadelphia.