already seen, they will attach. This ia usually followed by 



-27- 



now take up coordination in the behavior of the tube feet during 

 their transition stages between the looomotor and the non- 

 looomotor state* 



If a rigid starfish be suspended and some of the extended 

 tube feet be broughct in contact with a solid object, as we have 



increased activity of the neighboring tube feet and if the 



v 



starfish is not too rigid, by their active bending & *fcxx We 







toward the stimulated cre<x .. It is in this phase of their 

 behavior, that the beginning of the step reflex can be 

 elicited toy proper stimulation* 



Coori j.natip^ tp passive movements of tub& feet* 

 If on such a starfish a long tube foot be brought in 

 contact with a small object, such afe a pencil point the disc will 

 attach. If np'?i, the pencil point be moved, with the tube foot 



still adhere'ing so that the direction in which the tube foot iS 



r 

 now pulled out is different from that in which it originally 



extended itself, other tube feet will thencoordinate themselves, 

 not in the direction of the original extension of the stimulated 

 tube foot but rather in the direction to which it had been passively 

 moved* This tendency to coordinate thus, while very marked in 

 some animals, is of course apt not to show itself in starfish that ar 

 are very inactive or very rigid, and is apt also not to 



at all, if there is a strongly laarked coordinated impulse in 

 some other direction. Out of thirty trials on starfish in 

 various physiological states there was well marked and active 

 coordination to passive movement in fifteen. 



This coordination could also be brought about when the tube 

 f*t was twisted by turning the pencil a few times ia the hand 

 before pulling the tube foot over in its new direction. I could 



