78 



CORRELATED VARIATIONS. 



are measured along the ordinates, they varying on an 

 average between the extremes of + 3.19 and 3.01, 

 whilst the mean deviations of the associated organ are 



-i 



2 



-1 



+ 1 



+ 2 



X 



4-2 







-1 



-2 



-2 -1 -i-l +2 



FIG. 16. Correlation between post-spinous carapace length and 



total carapace length of shrimp. 



measured along the abscissae, they varying on an aver- 

 age from + 2.92 to 2.17. The crosses in the dia- 

 gram indicate the values obtained when the carapace 

 length was fixed, and the circles those when the post- 



