Contents 



I* Introduction 



II Acknowledgments 



III Materials 



IV Physiological states 



1. Rigidity and attachment 

 a. Persistence for -weeks 



2. Locomotor 



3. Resting or "active unoriented" state 



4. Comparison of the physiological states of the different 

 species studied* 



V. Responses of a single tube foot 

 1* Extension. 



a. Conditions of extension 



b. Direction of extension 



1. Locomotor starfish 



2. Stationary starfish 



3. Rigid starfish 

 o* Mechanism 



1. Normal 



2* In isolated tube feet 



3* Mechanical curvature, 



4. Physiological inertia or lag 

 2. Attaching 



a* Conditions 



1* Physiological state 

 b. Strength of attachment 

 c Structures involved in attaching 



1. Attaching reactions of isolated tube feet. 



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