TRANSFORMATION OF BRACHIONUS PALA INTO B. AMPHICEROS. 1 1 7 



five drops of sodium silicate every female possessed these addi- 

 tional spines and in all the jars containing ten drops of sodium 

 silicate every female also carried these spines. Not only did the 



TABLE I. 



SHOWING THE INFLUENCE OF SODIUM SILICATE IN THE PRODUCTION OF Two 



ADDITIONAL POSTERIOR LATERAL SPINES IN THE FEMALES OF 



Brachionus pala THUS FORMING Brachionus amphiceros. 



females carry the large additional posterior lateral spines but 

 their other two posterior spines as well as their anterior spines 

 were considerably larger in size than those of the control females. 



