CORRELATED VARIABILITY. 61 



Example. Absolute difference between dextral (d) and 

 sinistral (s) lateral edges (L) of carapace of right-handed 

 fiddler-crabs Gelasimus pugilator (Yerkes, 1901; Duncker, 

 1903)' 



d=L d -L 8 : -10123 

 /: 1 63 310 23 3 



2X<f) = 310X 1 + 23X2 + 3X3=365, 



J(<T) = 1, ^ (/") = !; n=400. 



w _ 336X365-X1 



^ 

 400X366 ~ 146400 



