) I 



tightly, until they behaved very much like they do in 

 ordinary but rather inictive locomotion. The arm being very 

 flexible, coordination did not occur when the neurotoraized 

 arem *as anterior, because it bent around and under before the 

 tube feet let loose. Some throe or four tours ; fter the 

 operation the tube feet in the nvuromo tized arm were all 

 retracted and the arm practically motionless. A week later the 

 wound seemed to have healed and the arm to hare regained its 

 natural movements. 



When this experiment was repeated on Pisaater. the animal 

 remained stationary for fiw minutes, the neurotoraized ray, 

 affixing itself rather firmly to the substrate* A* the end 

 of this time the other rays were seen pulling in the direction 

 of their former anterior, away from the neurotomized ray. Some 

 refractory tube feet were seen attaching to the substrate, which / 

 were wrenched off by the activity of the uninjured arms. One 

 left Jte disc behind. Refractory feet became fewer and loss 

 refractory. In one minute coordination was complete, though not 

 very active. The animal walked quite rapidly the length of the 

 aquarium. Locomotion seemed normal except that the nsurotomized 

 arm was contracted and rigid. It was always behind or obliquely 

 behind in locomotion* 



It might seem possible therefore that coordination of the 

 tube feet is not wholly dependent upon the presence of an insect 

 nervous system* If such stimuli as cause the attaching reflex, are 

 carefully excluded coordination may be established, across a -ut 

 nerve cord by the traction of the other anas. 



When the neurotomized starfish had tone to rest it was 

 observed that the four intact rays were stationary while the neuro- 

 moized ray walked xautit about in the sector between the adjacent 

 stationary rays. I Eion prodded the starfish and threw it into a 



