EXPLAXATION OF PlATE I 



Six specimens of Cassiopea xamachana regenerating successively greater amounts of material. At 

 the beginning of the experiment the individuals were equal in size, 24 days later the photograph shows 

 that they have decreased in size in direct relation to the amount of material being regenerated. The 

 specimens which are growing eight arms and have decreased most in size, although weak and emaciated, 

 regenerate each arm at a faster rate than do those growing fewer arms. 



