Baker — The Molluscan Fauna of Western New York. 93 



Family Amnicolidae. 



Genus Amnicola G. & H. 



129. Amnicola limosa Say. 

 Stations 6 and 9. Genesee River (Walton). Common. 



*130. Amnicola porata Say. Erie Canal. 



*131. Amnicola orbiculata Lea. 



*132. Amnicola pallida Hald. 



*133. Amnicola granum Say. 



134. Amnicola LUSTRiCA Pilsbry. Station 5. Rare. 



Genus Cincinnatia Pilsbry. 



135. Cincinnatia obtusa Lea. 

 Stations 6 and 9. Common. 



136. Cincinnatia cincinnatiensis Anthony. 

 Station 9. Only a single specimen found. 



Genus Gillia Stimpson. 



137. Gillia altilis Lea. 



Station 9. Erie Canal (Walton). Rather common. 



Genus Somatogyrus Gill. 



138. Somatogyrus subglobosus Say. 

 Station 9. Common. 



Family Valvatidae. 

 Genus Valvata Mliller. 



139. Valvata sincera Say, 



Stations 5, 6 and 9. Erie Canal (Walton). Verycommon, 

 and subject to considerable variation. 



140. Valvata tricarinata Say. 



Stations 3, 5 and 9. Very common and exceedingly vari- 

 able, being either uni-, bi- or tricarinate. 



