41- 



the tube faet in different parts of the starfish in different 

 and sometiijios oppostie directions is highly adaptive in tint it 

 is the only tray the aot could be accomplished* 



Thus in the above diagram, fig* 14 w*iich illustrates a 

 frequently observed type of righting jpeaotion the rays labeled a, & 

 have doubled under and ire migrating in th<j direction of the arrow* 

 The raya labeled o. e, under the influence of the same unified Impulaa 

 have turned in the same dir action but migrate, aftsr having turned, in 

 the opposite direction, thus crossing over the am* a. lj> and complet- 

 ing the somersault* As soon ms the righting is complete the rays 

 o. 2 * th ABM> direotion as the rays a. b. 





t~ 



the swirfi^ in position 1 it *as mov- 

 ing in tha direction of thT arTO 1 * and all of the tube feet were 

 oriented in this direction. However, when coming up against the 

 obstacle (3) the tube feet of each ray immediately changed their 

 orientation to the direction indicated by the arrows at the tips of 

 the respective rays. This results in the 





