370 UNIVALVE SHELLS 



g. A magnifiedlobe with the capsule in a younger 



state, 

 h. A broken capsule, with the seeds scattered 



about. 

 N. B. These are free, and the apparent thread* 

 only fragments of the capsule. 

 i. The underside of a lobe, 

 j. A few sporae or seeds greatly magnified, 

 k. An obsolete hollow calyx. 

 1. A calyx almost including the young capsule, 

 C. orbicularis. The only species. 



Description of univalve terrestrial and fluviatih 

 Shells of the United States. By Thomas Say. 

 Read December 25, 1822. 



The shells described in the following pages, have 

 been discovered since the publication of my last es- 

 say on land and fresh water shells. 



GENUS HELIX, Lin. Lam. Ferrussac. 



H. Hrrorata. Shell imperforate, depressed- sub- 

 globular, pale reddish brown, with very numerous 

 white small spots, and about four deeper brown ob- 

 solete bands ; whorls rounded, nearly five in number, 

 wrinkles obsolete on the body whorl, more distinct 

 on the spire; spire depressed, convex; suture decli- 

 ning much near the mouth ; aperture on the side of 



