400... 



300. 



200. 



100. 



Trans. Wis. Acad., Vol. XI. 

 July. Aug. 



Sept. 



Oct. 



Plate XXIII. 

 Nov. 



Fig. 7. — Leading Crustacea, 1894. Scale, 1 space = 100,000 Crustacea 



per sq. meter. See p. 308. 



D. hyalina _ . , _ _ 



Cyclops. 



July. 



Diaptomus ... . 9 



Sept. 



1,100. 

 1,000. 



900. 



800. 



700. 



600. 



500. 



400. 



300. 



200. 



100. 



Fig. 10. — Total Crustacea, July-Dec, after deducting Chydorus. Scale, 



1 vertical space = 100,000 Crustacea per sq. meter. See p. 312. 



1894.... © . . 



1895 . . 



1896.... 9 » 



