Literature
- Hemphill , H. 1911 . Descriptions of some Varieties of Shells, with Short Notes on the Geographical Range and Means of Distribution of Land Shells . Transactions San Diego Society of Natural History , i : 99 – 108 . 4 figs. (1911)
- Pilsbry , H. A. 1905 . Mollusca of the Southwestern States, I.: Urocoptidæ; Helicidæ of Arizona and New Mexico . Proceedings Academy Natural Sciences Philadelphia, 1905 , : 211 – 290 . pls. xi.–xxvii. (May 1905)
- Pilsbry , H. A. 1916 . Notes on the Anatomy of Oreohelix, with a Catalogue of the Species . Proceedings Academy Natural Sciences Philadelphia, 1916 , : 340 – 359 . text-fig. 1, pls. xix.–xxii. (June 1916)
- Pilsbry , H. A. 1917 . Notes on the Anatomy of Oreohelix. II . Proceedings Academy Natural Sciences Philadelphia, 1917 , : 42 – 46 . text-figs. 1–4 (March 1917)
- Pilsbry , H. A. and Ferriss , J. H. 1918 . New Land Shells from California and Nevada . Nautilus , xxxi : 93 – 95 . (Jan 1918)