of the specimens taken from those tiro locations, which was not, BO 

 far as I was able to determine, due to the salinity of the ;ater in 

 the aquaria, its temperature, freshness, air content or tha food needs 

 of the animal * 



Pilaster taken from the surf -beaten rooks were vary inac- 

 tive, would attach tightly for Ions periods of time to the substrate* 

 and could not be exoitad to active loooiaotion by the most varied, per- 

 sistent, or continued stimulation* The water in the aquaria was run- 

 ning freely and would keep these animals alive and other animals 

 ( starfish, crabs, sea-urchins etc.,) alive and active indefinitely* 



The specimens of Pisaster ooraoeua taken from Oakland 

 harbor presented, ^hen fresh, activity of an almost opposite nature* 

 It was quite as difficult to get them to stop crawling as it was to 

 get those from the surf beaten rooks to start* In some specimens this 

 state of extreme, activity never appeared} but in the large majority 

 it appeared -7hen the animals were first put in the aquarium and, con- 

 tinued, interrupted by rest periods of greater or less extent, for 

 from two hours to two months* 



The only speoiaen from the surf -beaten rooks at Pacific 

 Grove which showod this marked looomotor activity was one that had 

 been in the quiet water of tha aquarium for nearly thre weeks* At 

 the end of this period the animal forsook the tight clinging which 

 had occupied it during its struggle to maintain a foot hold on the 

 rocks and began active migration* 



The specimens occurring on piles in the relatively quiet 

 waters of Oakland harbor do not attach very tightly, though they can 

 do so when disturbed and are not nearly so prone to attach Then 

 brought to the aquarium* 



X am not inclined to attribute this behavior to "learning" 



