420 



GEORGE W. TANNREUTHER. 



I, 2, 3 and 4 shows the position of the spermary at different 

 periods of growth on the bud, and its final position when the 

 bud is completely formed. Note the position of the spermary 



Spermary 



/< 



1 .a 



DIAGRAMS A, B, C and D to show the migration of reproductive organs from 

 parent hydra to the forming buds. 



before its migration began. In Diagram C, I, 2, 3 and 4 the 

 spermaries were located near the outer edge of the region of 

 grov/th (R-G). The time required for the development of the 



