290 



Having grouped them into three definite ages, a summary of the characters 

 for each was made, and curves constructed. Figs. 6, 7, 8 and 9 represent the 

 curves for these characters. In all the curves constructed for these ages, the contin- 

 uous line is for the third year specimens, the broken line for the second year 

 specimens and the dotted line for the first year specimens. 



Later.\.l Line. — Below is the table of the average number of scales in the 

 lateral line of the three ages. 



1st j/eai: 2d year. 3d year. 



Eight side 87.84 90.80 88.39 



Left side 88.00 89.80 88.78 



From this it is seen that the first and third year specimens are most nearly 

 alike. The second year specimens have about two scales more. By reference to 

 the curves, I^ig. 6, and Table VIII below, it will be seen that the great bulk 

 of the specimens of all three ages have from 85 to 92 scales. The increased 

 average in the second year is due to a larger per cent, having 93, 94, 95 and 96 

 scales than in the first and second vears. 



20 



15 



10 



80 85 



90 



Fig. 6. 



95 100 



