Fourteen species of snails found living in the Franklin Mountains, El Paso County, Texas, are listed, together with notes on their distribution and ecology. A fossil fauna of Pleistocene (probably Wisconsinan) age is reported. It contains twenty species, ten of which no longer seem to occur in the range. Paleo- ecologically, the fossil fauna suggests a more mesic climate and presence of forested slopes in the range as low as 4,900 ft elevation. INTRODUCTION. The Franklin Mountains, proper, are located al- most entirely in El Paso County, Texas, in the Basin and Range Physi- ographic Province and in the northern Chihuahuan Desert. To the south, the range terminates abruptly within the city of El Paso by downward plunging of fault blocks. The northern terminus is at a low pass, Anthony Gap, located along the Texas-New Mexico border. North of Anthony Gap, a lower range, the North Franklin Mountains (not treated here) extends northward for approximately seven miles. Tilted fault blocks are an important structural feature of the Frank- lin Mountains. These blocks dip towards the west at an angle of 230 to 450 (Nelson, 1940: 159). However, the mountains are structurally complex and also exhibit thrust faulting and overturned folding. Ac- cording to Harbour (1960: 1785), more than 10,000 ft of sedimen- tary rocks, ranging in age from Precambrian to Cretaceous, are ex- posed in the range. In addition, there are large areas underlain by igneous and metamorphic rocks, chiefly quartzites, granites, rhyolites, and basalts, and mostly of Precambrian age. In places, certain of the siltstone, limestone, and rhyolite outcrops have produced large ac- cumulations of talus that often harbor gastropods (see accounts of Ashmunella pasonis and Sonorella sp. below). Topographically, the northern and southern parts of the range are narrower and more serrate; the central area, around North Franklin Mountain, wider, higher and more massive. The mountains rise ca. 3,000 ft above the surrounding intermontane basins and piedmont