130 'Journal of Comparative Neurology and Psychology. 



averages for each three successive individuals, thus giving four 

 entries in each of the condensed tables. 



The only exception to this statement is in the case of R. escu- 

 lenta, with but il records, and there the third entry in the con- 



TABLE 8. 

 Data on R. esculer.ta. 



TABLE 9. 

 Data on R. temporaria. 



densed tables is based on only two individuals, numbers 7 and 8 

 in the series. The condensed tables are given in connection with 

 each character discussed, 

 tral nervous system follows: 



That for the weight of the entire cen- 



