4- 



(see Sterne 1891} nor even to habit formation (Jennings 1907), but 

 would explain it moro simply as a very marked and striking example 

 of "physiological inertia" t : (Jennings 1907) or tha tendency to 

 tontinue past responses in spite of present stimulations, v/e shall 

 inquire further into the nature of this tendency, (see also Romanes 

 & Swart (1881), Prayer (1886), Mangold (1908^) f Bonn (1908), Oowles 

 (1911 ), Holmes (1911), lole (19150). 



To the tto physiological states above noted, the one of 

 extreme rigidity and attachment and the other of aotivs locomotion 

 with the arms more or less extend ad and flexible w may add a third 

 state in -vhich the arms are eat tended as in the loooootor st^te but 

 the tube foot are not oriented in any particular direction as they 

 are in the locomotor aninal. The tube feet are more or less aotiye 

 and not tightly attached. 



Aniaals in these three states will be referred to as 

 (l) lodoiaotor or crawling starfish, (2) rigid starfish and (3) active 

 but unoriantodjOr resting starfish respectively* In these different 

 states the animal's behavior is wholly different* 



Pyonopodia heliao trifles the large 20 rayed "sun star* 

 present these same physiological ststes in quite as marked a manner 

 as Pisagt-sr. I hive nevar observed pyonooodia to assua the rigid 

 or attached state fhen on a horizontal substrate* It will attach 

 quite readily to a vertical substrate, and with such tenacity that 

 it is very difficult to rajaove it, but on a horizontal substrata I 

 have observed it 



