Michigan Geological and 

 Biological Survey. 



rnliliiation -1 ; Biology 2. 

 I'late IX. 



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(A) GENERAL VIEW (»E lUSII LAKi:. 



(B> RAYlIUXIiS I'OINT ON Till: NuKTII SIldKE ( >E ItlSIl LAKi:. 



