60 SOMATOGYRUS. 



Genus SOMATOGYRUS, Gill. 



1. SOMATOGYRUS ALTILIS, Lea. 



Plate 17, fig. 9. 



Shell subglobose, rather thin, light green or 

 horn-color ; spire short, apex acute ; whorls 4, 

 well rounded ; aperture large, ovate-orbicular. 



Alt. 8, diam. 6-5 mill. 



Eastern Pennsylvania, Potomac River, 

 Santee Canal, South Carolina. 



This shell is very numerous in the vicinity 

 of Philadelphia. It is the same as the species 

 described by Haldeman as Leptoxis crenata. 



2. SOMATOGYRUS SUBGLOBOSUS, Smj. 



Plate 17, figs. 10, 11. 

 Haldeman, Paludiaa, t. 10, figs. 7, 8. 



Subglobose, horn color, whorls 4, rounded, 

 spire short conical, suture very much im- 

 pressed; aperture large, oval-orbicular, um- 

 bilicus rounded. 



Alt. 8, diam. 10 mill. 

 (41) 



