Trans. Wis. Acad., Vol. XI. 
Plate XXXII. 
Sept. Oct. Noy. Dec. 
0- 3 m Mch. Apr. Mat. June. July. Aug. 
6- 9 m 
Fig. 22.—Population of the 3 m. levels, 1895. Scale, 1 space = 100,000 Crusta¬ 
cea. The 25,000 and 50,000 divisions are indicated. See page 387. 
