490 PROCEEDINGS OF THE ACADEMY OF [1896. 



yer's Springs, Waldeu Ridge (68653) ; bank Emory Riv., Harri- 

 man (68644) ; Knoxville (68651) ; Johnson Citv (68647) ; Roan 

 Mt., 5000 ft. (68652). 



20. Pyramidula alternata (Say). 



Samburg, Reelfoot Lake (68661) : Belle Mead Farm, near Nash- 

 ville (69079) ; Bellevue (68663) ; Williams Isl., near Chattanooga 

 (68664); Chattanooga (69080) ; Sawyer's Springs (69081) ; Knox- 

 ville (68662) ; Greeneville (68657) ; Johnson City (69082) ; Rock 

 Creek, Roan Mt. (68655) ; Doe Riv., Roan Mt., 4000 ft. (68656). 



21. Pyramidula alternata carinata (Auct.). 

 Emory Riv., near Harriman (69083). 



Most Tennessee specimens of this species are more coarsely and 

 strongly ribbed than northern and western examples, and there is 

 often a more or less pronounced peripheral keel. The culmination 

 of this type of shell is P. alternata mordax, of which, however, no 

 specimens were taken at localities recorded above. The form called 

 var. carinata contrasts with these, being very fine-ribbed and dis- 

 tinctly carinated, and not at all of the mordax type. Peculiarly de- 

 pressed, but not keeled, specimens occurred at Sawyer's Springs. 



22. Helicodiscus lineatus (Say). 



Belle Mead farm, near Nashville (68681) ; bank Emory Riv., 

 Harriman (68682). 



HOLOPODA. 



Family HELICIDJE. 



23. Polygyra plicata Say. 



Emory Riv., near Harriman (69060). 



24. Polygyra troostiana Lea. 



Belle Mead Farm, near Nashville (69061). 



25. Polygyra inflecta (Say). 



Raleigh (68579, 69062); Belle Mead Farm, near Nashville 

 (68581); Bellevue (68577); Williams Isl., near Chattanooga 

 (68574) ; Chattanooga (68584, 68572) ; bank Holston Riv., above 

 junction of French Broad Riv. (68573) ; Knoxville (68575) ; Green- 

 ville (68576) ; Johnson City (69583). 



26. Polygyra rugeli (Shutt.). 



Sawyer's Springs, AValden Ridge (68571); bank Emory Riv., 

 near Harriman (68570). 



