28 THE NAUTILUS. 



SlICCINEIDJS. 



Succinea obliqua, Say. Common, Bethlehem. 



Succinea avara Say. Damp meadows on JVIonocasy Creek. 



PHILOMYCID..E. 

 Philomycus carolinensis Bosc. Freemansburg, Pa. 



AURICULID^E. 

 Carychium exiguum Say. Bethlehem. 



LIMNAEID^E. 



Limnaea catascopiurn Say. Monocasy Creek, unusually large 

 specimens taken, measuring, length 26, diam. 15 mill. 

 Limnaea desidiosa Say. Monocasy Creek. 



Planorbis bicarinatus Say. Lehigh and Delaware Rivers, common. 

 Planorbis campanulatus Say. Lehigh River, not common. 

 Planorbis deflectus Say. Canal and pond, Bethlehem. 



Ancylus rivularis Say. Delaware River, Easton, Pa. 



Physa heterostropha Say. All streams. 

 Physa ancillaria Say. Monocasy Creek. 



VALVATID^E. 



Valvata tricarinata Say. Monocasy Creek, common. 

 Valvata bicarinata Lea. Pond, Bethlehem. 



Amnicola decisa Hald. Canal, Bethlehem. 



Amnicola granum Say. Lehigh River. 



Somatogyrus altilis Lea. Lehigh River. 



Pomatiopsis lapidaria Say. Monocasy Creek, not common. 



VIVIPARIDJE. 



Campeloma decisum Say. Lehigh River and Monocasy Creek 

 common. 



Lioplax subcarinata Say. With the preceding species, common. 



