25 



— peristome usually with teeth. 9 

 9 not carinated (typical f.); surface roughly hirsute; 



color deep brown; diam 2 i, alt. i o mill, palliata, Say. 



— carinated (typical f. ;) surface with rib-like strict 



and spiral lines; color reddish horn; diam. 26, alt. 



II mill. obstricta. Say. 



10 upper tooth of peristome directed inward; notch be- 



tween the teeth narrow or anguhir; last whorl be- 

 hind the aperture deeply constricted; color light to 

 grayish horn; diam. 14, alt. 8 mill. fallax, Say. 



— ujjper tooth not directed inward; notch rather 



rounded; horn colored to brownish; diam. 16, alt. 



7 mill. tridentata, Say 



11 umbilcus covered. 12 



— umbilicus open, or partly open, sometimes quite nar- 



row. I 8 



12 diam. 17 mill, or less; sh. rather elev ted, some- 



what globular. 13 



— diam. larger. 14 



13 peristome well curved; color pale or yellowish horn 



mitchelliana. Lea 



— peristome slightly angular below at the periphery. 



pennsylvanica, Green. 



14 much elevated, globose, whorls 7; peristome with 



strong lip, a rather large parietal tooth; color yt\- 

 lovvish horn; diam. 25, alt. 17 mill. elevata, Say. 



— moderately elevated. i 5 

 I 5 with numerous reddish-brown revolving bands and 



lines; sh. and lip rather thin; diam. 23, alt. i 4 mill. 



multilineata, Say. 



— not banded i 6 

 I 6 rather depressed; lip and parietal tooth strong; aper- 

 ture rather narrow; color yellowish horn; diam. 



23, alt. 10 mill. dentifera, Say. 



— sh. and aperture less depressed; color horn to red- 



dish horn. 17 



