HELIX. 127 



DESCRIPTION. 



Animal. Asliy brown on the upper surface, lighter 

 on the posterior extremity and sides ; collar grayish- 

 white ; glands prominent and distinct. 



Shell. Yerj convex, elevated, almost conical ; epi- 

 dermis yellowish hom-color ; whorls nearly seven, 

 rounded, with fine oblique transverse strise ; suture dis- 

 tinct ; aperture contracted by the Up, somewhat trian- 

 gular ; lip white, reflected, lower inner margin a little 

 thickened ; pillar-lip with a large, white, I'obust, oblique- 

 ly-curved tooth ; umbilicus covered. 



Greatest transverse breadth seven-eighths of an inch. 



Geographical Distribution. Inhabits the Northern 

 States, from New York to Missouri, the western parts of 

 Pennsylvania and Virginia, East Tennessee, and the 

 States bordei-ing upon the Ohio River. It is very abun- 

 dant in the neighborhood of Cincinnati. 



Remarks. This is a rather thick and heavy shell. 

 It resembles S. Pennsylvanica in general aspect, but is 

 larger, has one more whorl, and is a coarser shell. The 

 tooth on the pillar lip, which is wanting in the other, will 

 always enable one to distinguish the mature shells ; but 

 the young resemble each other so nearly that it is diffi- 

 cult to discover a difference. The variations of the 

 species are small, the greater or less elevation of the 

 spire being the common cause of the differences. 



In captivity, it burrows much under the surface of the 



