200 



HELICID^. 



separated by a deep, narrow fissure. On the columella 

 is a quadrate, erect, oblique lamella, its upper edge 

 joined to the upper angle of the aperture by a threadlike 

 callus. 



Diameter one-fifth of an inch, axis one-eighth of an 

 inch. 



Geographical Distribution. Found by Mr. Bart- 

 lett in Mississippi and Arkansas. 



Remarks. This pretty little shell is intermediate be- 

 tween S. hirsuta and H. inflecta, though smaller than 

 either. It is less globose than hirsuta, while the aper- 

 ture is much the same, except that the sinus of the lip is 

 formed by the projection of two teeth instead of by an 

 emargination, in this respect resembling H. inflecta. 

 From the latter it differs in the columellar tooth. It re- 

 sembles ff. pustula still more ; but the umbilical region 

 is quite difierent. — [g.] 



r^^f#^K^^>^^^ 



