44 GASTROCOPTA, NORTH AMERICA, WEST INDIES. 



but near the aperture it runs out upon the parietal wall, 

 where it appears as a more or less elevated cord between the 

 parietal lamella and the columella, occupying, therefore, the 

 place of an infraparietal lamella. These lamellae are well 

 shown in fig. 13 &, a basal view in which the base of the shell 

 has been removed. The upper palatal fold is short, situated 

 some distance within the mouth, but visible from in front. 

 The lower palatal is long, entering, and so deeply immersed 

 that it is not visible in a front view, being concealed behind 

 the massive parietal barrier. There is a radially-placed basal 

 fold, scarcely or not visible in a front view ; the edge is seen 

 in pi. 6, fig. 6. Length about 2, diam. 1 mm. 



9a. Form minor Sterki. "Smaller than the types, 1.5 to 

 1.9 mm. high; the shell is also thinner, the color paler, the 



FIG. 14. G. ashmuni minor. Nogales. 



everted part of the lip less broad, the number of whorls one- 

 half to one less" (Sterki). Length about 1.6 mm., with 4 to 

 4% whorls. The structure is otherwise substantially as in 

 ashmuni. 



Arizona: Nogales; also on the Mexican side of the inter- 

 national boundary, and Ephraim canyon, Santa Rita Mts. 

 (E. H. Ashmun). Dragoon Mountains, in colonies with the 

 typical form (Pilsbry, Ferriss and Daniels). 



10. GASTROCOPTA COCHISENSIS (Pilsbry and Ferriss). PL 6, 



figs. 1 to 4, 8. 

 The shell is rimate, slightly tapering-cylindric, thin, pale 



