Plate I. 



■ig. 1 . — Bed of Maumee River 

 just below Columbia Street 

 bridge, Fort Wayne, Ind., 

 showing mussels killed by 

 sewage from city gas works. 



Fig. 2.— The dried bed of the 

 Feeder Canal, showing mud 

 cracks and mussel shel' 

 in situ. 



Fig. 3.— Pile of shells, chiefly 

 m u c kets , Lampsilis liga min- 

 tinus, containing 25 tons, 

 gathered fromthe Maumee 

 River near Fort Wayne, 

 Ind. 



