40 ■ G. H. Parker 



around which the first truly nervous organs, receptors, in the form 

 of sense-cells developed giving rise to a condition such as is 

 seen in the coelenterates today. To this receptor-effector sys- 

 tem as seen in modern ccelenterates was added in the higher meta- 

 zoans the adjuster or central organ, thus completing the essen- 

 tial parts of the neuromuscular mechanism as seen in the higher 

 metazoans. 



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