290 



llavini; i^nniped tlieni iiUo throe (Ictiniti' ages, a summary of tlie eharacters 

 f(ir eaeli was made, ami nirves coiistrueted. Fig.s. 6, 7, S ami !• represent the 

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

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

 specimens and the dotted line for the first year specimens. 



Lateral Link.— Behiw is the table of the average numher of scales in the 



lateral line of the three ages. 



1st i/ear. 2d year. 3d i/ear. 



Right side 87.84 90.80 88.39 



I^ef, side 8-S.OO 89.80 88.78 



From this it is seen that the lirst and tliinl year specimens are most nearly 

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

 the curves, Fig. (i, and Table VIII below, it will be seen that the great bulk 

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

 average in the second year is due to a larger per cent, having 98, 94, 9") and 96 

 scales than in the first and second years. 



20 



15 



80 85 90 95 iOO 



Fig. 6. 



