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 Leptomis crenata. 
2. SOMATOGYRUS SUBGLOBOSUS, Say. 
Plate 17, figs. 10, 11. 
Haldeman, Patudina, 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. 
(Al) 
