Bttix. U. S. B. v., 1910-20. 



Platk IX. 



Fig. I. — An undredfied jxirtion ul the Kankakee River where valuable luusseU Iluuri^h. 



I'lG. 2. — A drednt-d purlion vi the Kankakee River rendered (temporarily, at least; unfit fur fre^h-watcr 



mussels. 



