58 



ROBERT W. HEGNER 



TABLE 26 



Arcella polypora. Correlation table for diameter of mouth and diameter of shell 

 in sixty large specimens collected at Bloomington, New York, on September 4-, 

 1918. TheunitofmeasurementisIf.Sfi. Coefficient of correlation, 0.9^0 ± 0.010 



inherited independently, but it is clear from the tables that the 

 correlation between these characteristics is very close both within 

 families and in wild populations. 



