PHYSA, 153 
31. PHYSA LATA, TZryon. 
Plate 8, fig. 11. 
Shell very fragile, light horn-color, waxy, 
regularly striate; spire moderately elevated ; 
whorls convex; apex acute; suture well im- 
pressed ; body inflated; aperture rather large, 
columellar lip turned to the right, very nar- 
row, distinctly folded. 
Length 10°5, diam. 7 mill. 
Juniata River, Hollidaysburg, Penna. 
This species has very much the form of PA. 
heterostropha, but is rather more ventricose, 
much thinner, and the surface exhibits a pe- 
culiar glimmering lustre. It is more like PA. 
osculans, Hald., in its texture, color, and lustre, 
but the latter is a much larger species. 
(69) 
