[131.] 



armed with two teeth on the columella, of which the upper one 

 is largest, and frbm two to seven teeth on the outer lip, while 

 oiie to two teeth are situated on the parietal wall. Light horn 

 color. 



Length 2 mill. 



Maine to Ohio and southwards to Georgia. 

 The number of teeth developed on the lip increases with age 

 from the minimum to the largest number mentioned above. 



6. Pupilla decora, Gould. 



Plate 15, figure 7. 



Ovately cylindrical, apex obtuse ; whorls , 6, well rounded, 

 with deep sutures ; surface shining ; aperture small, rounded, 

 armed with 4 teeth, one on the parietal wall, one on the colu- 

 mella, the third on the base and the fourth on the outer lip ; 

 perforate ; light amber color. 



Length 2-5, diam. 1"3 mill. 



Vicinity of Lake Superior. 



7. Pupilla Rowelli, Newcomb. 



Plate 15, figure 8. 



Ovately fusiform, apex subacute ; whorls 5, moderately 

 rounded, with impressed suture ; aperture small, oval, with a 

 parietal, a basal, a columellar and an outer lip tooth; of these 

 the basal is largest, and that on the parietal margin the next 

 largest. 



California. 



8. Pupilla Californica, Rowell. 



Plate 15, figure 9. 



Ovately cylindrical, apex obtuse, whorls 5, slightly convex, 

 with rib-like striae ; aperture quadrately oval, with a tooth on 

 the parietal margin, another on the columellai?, a third on the 

 basal, and a fourth on the outer margin. 



California. 



Distinguished from P. Rowellii by its more obtuse outline, 

 raised striae and smaller basal tooth. Its striae distinguish it 

 principally from P. decora, Gould. 



