98 PROCEEDINGS OP THE ACADEMY OP 



Ancylus tardus, Say. 



Mohawk River. Found under stones along the margin of the 

 stream at low water. I have found them only during the fall 

 months. None could be found in 1811. 



Anodonta edentula, Say. 



Mohawk River and Erie Canal ; also streams running south to 

 the Susquehanna River. 



Anodonta fluviatilis, Lea. 



In ponds and streams near Schuyler's Lake. 

 Anodonta imbecilis, Say. 



Erie Canal. Very scarce and small. 

 Anodonta lacustris, Lea. 



Schuyler's Lake, Little Lakes, Smith's Pond, and a small pond 

 at Herkimer. \ small variety occurs in a marshy creek on the 

 hills eight miles south of Mohawk. 



Anodonta Lewisii, Lea. 



Erie Canal and Mohawk River. During the last ten j'ears this 

 species has been very nearly exterminated in the canal, affected, no 

 doubt, by chemicals introduced in the armory sewage at Ilion. 



Anodonta subcylindracea, Lea. 



Erie Canal, Mohawk River, and ponds at Herkimer. Not 

 abundant. 

 Anodonta undulata. 



Erie Canal and Mohawk River. Scarce. 

 Bythinella obtusa, Lea. 



Erie Canal and Mohawk River. In the rivers this species some- 

 times grows very large; it is usually much larger here than spe- 

 cimens I have seen from other localities. 



Carychium exiguum, Say. 



On moist laud in the Yalley of the Mohawk. I have not found 

 it abundant elsewhere. 



Goniobasis livescens, Menke. 



Erie Canal and Mohawk River. The shells vary, exceedingly, 



under the influences of station. The shells are characterized 



,i 



here as elsewhere by a weak epidermis, easily worn off. The 

 species has, no doubt, been introduced from western waters by 

 way of the canal. It is extremely abundant on rocks and hard- 



[July 16, 



