Bull. U. S. B. F., 1910-20. 



Plate IX. 



l■l^J. I. — All iindrcclyed portion of the Kankakee River wlarc \aluabk' inusstK-. liuun.-h. 



-A drcdyL-ii purtioii of the Kankakee River icndcrctl (tenipururily, at least) unfit for fresli-water 



mussels. 



