16 THE NAUTILUS. 



Planorbis parvus Say. Pond north of the R. R. bridge. 



Planorbis dilatatus Gould. Generally distributed. 



Gundlachia stimpsoniana (Smith). Doubtfully determined. 

 Associated with Ancylus fuscus, in the reservoir; generally on 

 the under side of fallen leaves from the surrounding timber, 

 never on the leaves of the elm and hickory. Both species were 

 plentiful in 1908 and 1909, but have since disappeared. 



Ancylus rivularis Say. Little Muddy creek. 



Ancylus tardus Say. Beaucoup creek. 



Ancylus fuscus Adams. Reservoir and Little Muddy creek. 



Ancylus kirklandi Walker. Little Muddy and Beaucoup 

 creeks. 



Physa heterostropha Say. Sheller lake. (This is a R. R. 

 reservoir. ) 



Physa gyrina Say. All streams and other bodies of water. 



Physa sayi Tappan. Reservoir, one specimen; it may be a 

 freak of gyrina. 



Physa hildrethiana Lea. Pond north of the R. R. bridge. 



Physa elliptica Lea. Above the R. R. bridge. 

 \ Physa integra Haldeman. Pond on the Hinkley farm. 



Physa oleacea Tryon. Pool near the R. R. bridge. 



Physa crandalli Baker. Pond on the Hinkley farm. 



Pleurocera neglectum (Anthony). Little Muddy between 

 Du Bois and Sheller lake; quite different from C. subulare. 



Amnicola cincinnatiensis Lea. Puncheon, Locust and Little 

 Muddy creeks. 



Pomatiopsis lapidaria Say. Low land of Little Muddy creek, 

 scarce. 



Viviparus contectoides Binney. Beaucoup creek, a small 

 variety. 



Campeloma subsolidum (Anthony). Little Muddy, Locust 

 and Beaucoup creeks. 



Quadrula latecostata (Lea). Little Muddy creek. 



Lampsilis distans (Anthony). Little Muddy and Locust 

 creeks. 



Lampsilis subrostratus (Say). Little Muddy creek and 

 Sheller lake. 



Lampsilis texasensis (Lea). Little Muddy creek. 



