These are small snails, only about 10 mm to 15 mm in diameter (or approximately one-half inch), notable for their elaborately convoluted apertures, with only very narrow openings. Their range is limited to the southern United States and northern Mexico.
Species
This genus contains the following species and subspecies:
^Binney, William G. (1878). The Terrestrial Air-Breathing Mollusks of the United States and Adjacent Territories of North America. Vol. 5 (plates). Bull. Mus. Comparative Zool., Harvard. Plate 40.
^Pilsbry, Henry A. (1940). Land Mollusca of North America (North of Mexico). Acad. Nat. Sci. Philadelphia, Monograph 3, vol. 1(2): 591-607.
^Burch, John B. (1962). How to know the Eastern Land Snails. Wm. C. Brown Co.: Dubuque IA, 214 pp.