. Bulletin - United States National Museum. Science. 170 A MANUAL OF AMERICAN LAND SHELLS. t MICROPHYSA. (See below.) Micropliysa Ing'ersolli, Bland. Shell iimbilicated, discoidal, thiu, translucid, nearly smooth, white; Fig. 160. spire flat, summit subimmersed; suture impressed; whorls 5J, rather convex, slowly increasing, the last not descend- ing, more convex below the periphery; breadth of um- bilicus nearly 1"™; aperture subvertical, higher than broad, lunate; peristome simple, acute, margins remote, columellar margin slightly reflexed, basal margin subsin- uate. Greater diameter 4,
. Bulletin - United States National Museum. Science. 170 A MANUAL OF AMERICAN LAND SHELLS. t MICROPHYSA. (See below.) Micropliysa Ing'ersolli, Bland. Shell iimbilicated, discoidal, thiu, translucid, nearly smooth, white; Fig. 160. spire flat, summit subimmersed; suture impressed; whorls 5J, rather convex, slowly increasing, the last not descend- ing, more convex below the periphery; breadth of um- bilicus nearly 1"™; aperture subvertical, higher than broad, lunate; peristome simple, acute, margins remote, columellar margin slightly reflexed, basal margin subsin- uate. Greater diameter 4, lesser Sf"""^; height, 2^"'"'. Micrnphysa Inger- /j>-\,(\ \ sola, enlarged. (^CiaUU.; Helix IngcrsoJUi, Bland, Ann. Lye. Nat. Hist, of N. Y., xi, 151, fig. (1874).—Inger- suLL, SjiecialEep. on Recent Moll, of Colorado, ed. 2, 397. Microphysa IngcrsolH, W. G. Binney, Terr. Moll., v, 173. A species of the Central Province. Howardsville, Baker's Park, 9,300 feet above the sea; abundant in wet places on the mountains. Not uncommon at Cunningham Gulch, near the former locality, cling- ing to the almost vertical face of a trachyte cliff, at an elevation of about 11,000 feet; the finest specimens came from this spot. Found also on the southern slope of the Saguache Mountains, in the Las Animas and La Plata Valleys, in the same stations as affected by Suc- cinea. All the localities mentioned are in the southwestern corner of Colorado. This species was discovered by Mr. Ernest Ingersoll, naturalist of the United States Geological Survey of the Territories, under Profes- .sor Hayden. It can scarcely be compared with any known North American species. At first sight I was disposed to consider the species a Zonites, but examination of the animal proved it to belong to the Helicea. Jaw low, wide, slightly arcuate, ends slightly attenuated ; whole an- terior surface with about 22 broad, flat, slightly separated ribs, whose ends denticulate either margin. Lin
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