Trans. Wis 

 1,000... 



Acad., Vol. XL 



Plate XXXL 



903.. 



800. 



700. 



600. 



500. 



400. 



300. 



200. 



100. 



...1,200 



...1,100 



J*ay 



...1,000 



• I 1 



Fig. 



Jan. Feb. Mch. Ape. Mat. June. July. Aug. Sept. Oct. Nov. Dec. 



21. — Cyclops. Number of each catch, 1895. The curve indicates the aver- 

 age. Scale, 1 vertical space = 100,000 Crustacea per sq. m. See p. 370. 



