-31- 



which is in fact away from the source of stimulation* In so 

 doing they come in contact with the substrate and execute the 

 step reflex* From this point on ; the coordination completes 

 itself in the same manner as outlined for the positive response* 



In case the stimulation it not sufficient to cause the 

 retraction or inaotivation of all the tube feet, it will spread 



the tube feet, to a certain extent so that the farthest tube 

 feet are the most active and therefore will dominate in the 

 coordination* 



Detailed description ojF positive aftd negative response in 

 Hrcnopodia. 



FHono podia on account of its large size and great activity 

 is very favorable for a study of the mechanism of coordination 

 in positiw and negativ* -"-a-nonaes. The active but not oriented 



,qu 







a the tube feet at the 



tip oi Sited in the direction of the ray, and 



r upon proper stimulation. Now 



A I A 



convinced me that a positive stimulation 



f coordinated activity in the 



C 



ordinated activity in the way 



