Michigan Ccolot^ic;!! ami 

 Biological Survey. 



Fubliration_20;lBiology 4. 

 Plate X X 11 



A. STA'IIdX s.' 



SI'UICK LAKK. LOOKIXC SOl'Ill ACHOSS Till'. i;Asr ]:NI) (d 

 THK LAKK. 



R. M.\K.-^in NdlMII .^IloHi; (>!■ \ 1. li .M I l.loV l.AKK. 



