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 



+ 2 



*1 



-1 



-9 



2 



-1 



+ 2 



+ 2 



-1 



-S 



piQ. 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- 



