48 



VARIATION AND CORRELATION IN THE CRAYFISH. 



TABLES OF MEASUREMENTS. 



The fifty-five correlation tables which furnish the data for this paper are given in 

 the present section. In each case the measurements are given in millimeters. In 

 order to save space a special rubric is not given for each table. Instead, on the top 

 and left side of each table are stated the two characters whose correlation is given by 

 the table. The plan according to which the tables have been arranged will be self- 

 evident on inspection. 



Table 22. 



