SOMATOGYRUS. 63 



5. SOMATOGYRUS AUREUS, Tryon. 

 Plate 17, fig. 14. 



Shell subglobose, spire short, suture well 

 impressed, apex obtuse; aperture pyriform, 

 Ijroadly rounded below ; columella lip slightly 

 reflected and appressed, scarcely covering the 

 narrow umbilicus. Color golden yellow. 



Alt. 4-5, diam. 4 mill. 



Tennessee River. 



Tiiis species much resembles S. integer, Say, 

 with which at first I had confounded it. My 

 closer attention was directed to it on account 

 of the difference of color. Integer has propor- 

 tionally a smaller spire, and the whorls are not 

 so well rounded, and, consequently, suture not 

 so well impressed. 



6. SOMATOGYRUS PARVULUS, Tryon. 

 Plate 17, fig. 15. 



Shell very small, globose, rather solid, con- 

 sisting of four convex whorls; spire small, 



(44) 



