Micliigan (;('()liifri<;il niul 

 Biological Survey. 



I'lihlicaliDii 4: r'.iology 2. 

 I'late X. 



(A) DT'NE I'OINT OX THE XORTH SIIOUE OF lilSII LAK! 





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(V,) I'IGEitX KIVEl; AI'.DVE CASEVILLE. 



