206 EUGLANDINA. 



The figure, copied from von Martens, represents a shell 

 from Tehuacan. The locality Mirador is doubted by von 

 Martens. 



76a. Var. POTOSIANA Pils., n. v. PI. 26, fig. 14. 



The shell is much larger than E. oblonga, composed of 7% 

 whorls. The sutures have a whitish edge and appear very 

 distinctly margined by transparence of the wall; below them 

 the whorl is weakly plicate. The surface is elsewhere ex- 

 tremely glossy and smooth except for occasional impressed, 

 pale varix-grooves, of which there are 3 or 4 on the last 

 whorl in adult shells. The color is rather light chestnut, 

 somewhat transparent. Columella deeply concave above, 

 short, abruptly truncate. Outer lip arching strongly for- 

 ward in the middle. 



Length 21.9, diam. 8, aperture 11.1 mm. ; whorls 7%. 



Length 19.5, diam. 7.5, aperture 11 mm.; whorls 714. 



Length 18, diam. 7, aperture 10.1 mm. ; whorls 7*4. 



N. E. Mexico: Valles, State of San Luis Potosi, type loc. ; 

 also Tampico (A. A. Hinkley). 



This is a stouter shell than E. dalli, with fewer whorls and 

 a more obtuse spire. It is larger than E. oblonga, with 

 weaker subsutural plication. 



766. Var. TAMAULIPENSIS Pilsbry. PI. 26, figs. 15, 16, 17. 



Shell narrowly oblong, the last whorl somewhat cylindrie, 

 spire slowly tapering to a rather large, obtuse apex. Surface 

 very glossy, smooth except for irregularly spaced, rather dis- 

 tinct and unequal, impressed lines in the direction of lines of 

 growth ; and the suture is bordered with fine, short and close 

 folds. Whorls fully 7%, regularly increasing, the last suture 

 not more obliquely descending. Aperture about half the 

 length of the shell, the outer lip arched forward in the middle, 

 basal lip retracted; columella short, very concave above and 

 convex below. 



Length 15, diam. 5.7, length of aperture 7.5 mm. 



Length 15, diam. 5.3, length of aperture 7.3 mm. 



N. E. Mexico: in a canon about 4 miles west of Victoria, 

 State of Tamaulipas, elevation about 3,000 feet. Types No. 



