-48- 



(-near the taO 



X next neuro tomi xed ^ea oh arm of a rather large starfish that 

 was not very active. X "started" it on the side of the aquarium 

 vath ita former "anterior" downward. Locomotion continued down 

 the aide until the disc was about at the angle of the wall with 

 the floor of the aquarium* At this point, the animal assumed the 

 rigid state and would orawl no farther* 



This experiment was repeated on a amaller and more active, 

 specimen. Locomotion down the side was more active, the 



(former anterior) arm* taking up the locomotion quickly and by 

 pulling, in harmony with the force of gravity, forced aoertain 

 amount of coordination in the other rays* There were a few 

 refractory tube feet in each of the rays, each ray shwwing a 

 tendency to migrate toward its own tip* 3hen the animal reached 

 the angle of the side with the floor of the aquarium the locomo 

 tor impuloe was so well established that crawling continued 

 across the floor of the aquarium and up the other side* If 

 an obstacle such as my finger was placed between the two anterior 

 rays and held stationary, two responses were observed* In two 

 oases a normal deviation reaction ensued, but the more frequent 

 result was a stoppage of locomotion followed after a variable 

 length of time b a resumption of locomotion in some other 

 direction* 



The starfish wa* then taken up and stimulated harshly on 

 the various rays* The animal assumed tho rigid state -then set 

 down the tube feet being tightly attached, and remained in this 



state for some time* The rays, that became active first were not 

 contiguous, X -a4-o, while b d and e remained attached* A and o^ 

 moved a out in their sectors at random all the afternoon* The 

 next raoraing the starfish was in a mo rib und condition but 

 had migrated across the aquarium during the night* 



The essentials of these experiments were repeated many 



