HYDE: DEVELOPMENT OF A TUNICATE. 179 



environment, to a certain stage, but act slower and less com- 

 pletely to stimuli than they do in their normal cooperative 

 medium ; the fragmentary organism that is left forms an 

 abnormal structure, with a protective tunic; the heart will 

 beat and muscles differentiate without the presence of the 

 nervous system. 



Hooker, Harrison, Goldstein Shaper, Burrows, Carrel and 

 others have worked on problems similar to mine. Their work 

 will be discussed in the final paper. 



2— Univ. Sci. Bull., Vol. IX, No. 14. 



