494 PROCEEDINGS OF THE ACADEMY OF [1896. 



58. Planorbis dilatatus Gld. 



Knoxville, in a spring (69303). 

 69. Ancylus diaphanus Hald. 



Knoxville (69334). 



Family PHYSIDJE. 



60. Physa gyrina Say. 



S. Harpeth River, 6 m. from Bellevue (69266) ; Knoxville 

 (69077). 



61. Physa heterostropha Say. 



Belle Mead Farm, near Nashville (69267) ; Nolachucky River, 

 near Greeneville (69269) ; Watauga River, near Watauga (69270) ; 

 Johnson City (69268). 



62. Physa Integra Hald. 



Samburg (69271) ; Johnson City (69272). 



63. Physa microstoma Hald. 



Belle Mead Farm, near Nashville (69275). Also taken in Ken- 

 tucky, at Mammoth Cave (69276) ; west bluff of Kentucky River, 

 opposite Frankfort (69277) ; Shelbyville, Clear Creek (68278). 



This seems to be a distinct and well characterized species, readily 

 distinguishable at fir.-;t sight from all other American forms of this 

 genus, in which specific lines are so difficult to define. Judging 

 from the rare occurrence of this name in the literature, the species 

 must be comparatively rare and local. 



PROSOBRANCHIATA. 



KHIPIDOGLOSSA. 



Family HELICINID^. 



64. Helicina orbiculata (Say). 

 Chattanooga (68633). 



65. Helicina occulta (Say). 



Bank Emory Riv., near Harriman (68634). 



This species was first found living in the West by Messrs. Pilsbry 

 and Shimek, but has subsequently occurred to conchologists in 

 many localities in Iowa, Minnesota and Wisconsin. In the East it 

 occurs living in "Western Pennsylvania" (Green), near Pittsburg 

 (Stupakoff), in Virginia, western North Carolina and eastern Ten- 

 nessee. Its range is apparently interrupted by the Ohio Valley, and 



