472 D. W. CUTLER. 
The values so obtained were then plotted on squared paper as described 
above, ten units of the paper in a vertical direction, representing one 
division of the micrometer ; thus fractions of a unit are easily plotted. 
By this method small differences in the widths of successive sclerites 
RoR sea eee esess 
eRe See ee cee 
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Fic. 1.—Seale curves from two fish, a Plaice and a Flounder. Four curves are 
drawn for each fish. Note the great resemblance between the four scale 
curves of each series. 
are easily detected, and by it I found that growth rings on Plaice and 
Flounder scales are as distinctly shown as in the scales of other fishes. 
SCALE INVESTIGATIONS. 
The total number of fish examined was 137, of which 8) were 
Flounders and 52 Plaice. In order to determine if there were any marked 
