Descriptions of New Fluviatile Shells. 

 l. jflelania athleta. 



Plate II. Fig. 1. 



T. conica, s&ibglabra, fuscocornea, juxta suturas pallidiore; spira 

 elevata; anfractibus 10, subplanis, obscure plicatis, jSlicis deorsum obso- 

 lescentibus ; suturis impressis ; apertura ovata, intus albido-nibescente ; 

 columella incurva, in sinum tenuem producta. 



Shell conical, nearly smooth, dark horn color; spire much 

 elevated; whorls 10, nearly flat, with faint longitudinal ribs, 

 most distinct on the upper part of the whorls ; sutures well 

 marked ; aperture small, ovate, within whitish, tinged near the 

 base with rose ; columella rounded, and forming a slight sinus 

 at base. 



Length 1.25 inches (32 millimetres). Diam. 0.40 inch (10 

 millim.). 



Length of aperture 0.40 inch (10 millim.). 



Breadth of do. 0.23 inch (6 millim.). 



Habitat. Tennessee. 



My cabinet. Cab. Lye. Nat. Hist., 1ST. Y. B. W. Budd. 



Obs. A stout species, and one of the most beautiful with 

 which I am acquainted. The ribs are not strongly expressed, 

 and on the lower whorls are nearly obsolete, having there the 

 appearance of strise of growth merely. Body whorl a little 

 angulated at base. 



2. Helania Tiridula. 



Plate II. Fig. 2. 

 T. conica, glabra, subcrassa, prasina ; spira elevata ; anfr. subconvexis ; 



