732 Wisconsin Academy of Sciences, Arts , and Letters . 
EXPLANATION OF PLATE XLV. 
Micropterus salmoides. 
Frequency polygon to show distance to the point of bifurcation from 
the base expressed in percentage of the length of the caeca. 
—-Primary bifurcation. 
.—'Secondary bifurcation. 
—.—.—.—Tertiary bifurcation. 
Ordinate—Number of cases. 
Abscissa—Position of bifurcation. 
