Fig. 4. — The Maumee River 

 below the State Dam, De- 

 fiance, Ohio, the richest 

 collecting ground in the 

 river. 



.j^-^m^ -_y 



Fig. 6.— A stretch of the 

 Miami and Erie Canal, an 

 excellent breeding ground 

 for mussels, and an ideal 

 place forartificial propaga- 

 tion. 



*^ 



