502 



JENNINGS— HEREDITY IN PROTOZOA. 



[April 24, 



Table XXVI. 



Ratio of Mean Breadth to Mean Length in the Lines and Races of Table 



XXV., page 494, Cultivated under Identical Conditions. 



general average for the caudatum group is 26.576 per cent. ; for the 

 aurelia group 30.840 per cent. 



In Table XXIV., page 491, we have data for certain other mem- 

 bers of the two groups when cultivated under similar conditions. 

 If we determine the ratio of mean breadth to mean length for this 

 table, the results are not so clear as in the cases we have just con- 

 sidered. They are given in Table XXVII. 



Table XXVII. 

 Ratio of Mean Breadth to Mean Length for the Races of Table XXIV., 



page 491. 



Caudatum Group. 



E 

 D 



Average 



. Aurelia Group. 

 C 



Average 



February 5. 

 Per Cent. 



31.245 

 / 27.615 

 I 25.651 



28.170 



26.482 



r 29.568 

 1 30.853 

 / 29.303 

 1 29.386 

 29.118 



February 15. 

 Per Cent. 



26.158 

 26.010 

 28.723 

 26.964 



26.396 

 28.298 



31.852 

 28.849 



February 27. 

 Per Cent. ; 



26.458 

 26.893 

 26.675 



In this table the averages for the aurelia group are again higher 

 throughout than for the caudatum group. But the highest ratio is 

 given by one of the caudatum group, and the line c of the aurelia 



