AMERICAN SPECIES OF VERTIGO. 77 



3. 1.8 x 1 mm. ; seven teeth. V. alabamensis, no. 2. 

 1.5 x 1 mm. ; six teeth. V. a. conecuhensis, no. 2a. 



4. More than 2.6 mm. long, of 6 whorls; spire long, the 

 aperture relatively small. V. morsei, no. 3. 

 Shell smaller. 5. 



5. Ovate, the spire very convexly conic; length about 2.2, 

 diam. 1.3 to 1.4 mm. ; 5 whorls ; usually with 7 to 9 teeth. 



6. 



Oblong-conic, the spire more slender than in V. ovata ; 2.5 

 x 1.35 mm., 5y 2 whorls. California. V. berryi, no. 5. 

 Oblong-cylindric, 2 x 1.1 mm., 5 whorls. Rocky Moun- 

 tains. V. binneya/na, no. 6. 



6. Crest and auricle well developed. 7. 

 Crest and auricle very weakly developed. California. 



V. o. mariposa, no. 4&. 



7. Teeth moderately large. V. ovata, no. 4. 

 Teeth longer and stronger. Texas. V. o. diaboli, no. 4a. 



1. VERTIGO RUGOSULA Sterki. PL 8, figs. 1, 2, 3. 



"Related to V. ovata and gouldti, in shape more elongated 

 than the latter, more cylindrical and somewhat larger. Aper- 

 tural parts and lamellae much like those of ovata, but the 

 columella is decidedly longer and straighter, and the inferior 

 columellar lamella is distinctly placed on it. Of a peculiar 

 formation is the surface : of the 5 well rounded whorls, about 

 one and a half of the upper are nearly smooth ; the following 

 with exception of the last are distinctively and regularly 

 striated, the last very finely but distinctly rugose in the sense 

 of the lines of growth; near the aperture again striated. 

 Color, dark chestnut. Length 1.8 to 2, diam. 1.1 mm." 

 (Sterki). 



South Carolina: Sullivan's Island, type loc., W. G. Mazyck. 

 Tennessee: near Cowan and near Sherwood, H. H. Smith. 

 Mississippi: Pass Christian, B. Walker. Louisiana: De Soto 

 Parish, L. S. Frierson; Lovett Landing, Morehouse Parish, 

 C. B. Moore. Oklahoma: Limestone Gap, Ferriss & Pilsbry. 

 Texas : Lee Co., J. A. Singley ; Navidad River bottom, Jackson 

 Co., J. D. Mitchell. 



