WISCONSIN GEOLOGICAL AND NATURAL HISTORY SURVEY. 



E. A. BIRQE, Director. 



BULLETIN NO. XII. SCIENTIFIC SERIES NO. 8 



THE PLANKTON 



or f o 



Lake Winnebago and Green Lake 



BY 



C. DWIGHT MARSH 



Professor of Biology in Rifron College. 



MADISON, WIS. 



PUBLISHED BY THE STATE. 



October, 1903. 



