58- 





of the object, an activation of their coordination toward the 

 tip of the ray* This will bo followed, almost immediately by 

 a dorso -flexion of the tip of the ray* She ray oan be said 



ywm&Ai 

 to set ifaalf more nearly at ri^ht angles to the extended active 



tube feet* This reaction has been observed time and again in 

 fisaater oraceuw. Aaterina. pyonopodia. ?,eptaaterias i a. 8 tor bre- 

 vi&inus and -.vaeteriaau As are moot movements 



of the animal it is a product of local reflexes in that it ie not 

 dependent upon connection with the oral nerve ring, but 

 occurs equally veil in active isolated arms. 



. for the gentle contact we aubatitute a harsh tapping of the 

 tip of the ray, the tube faet will retraot and the ray become 

 more rigid and shorter, but without any sign of the dorsal 



flexion* 



w have seen that if a tube foot in the middle of a ray 



be allowed to attach to an objeot and the object be then pulled 



to one side, the tube foot with it, other tube fee* will alee 



owe to the sane side and seemingly reach out for the object 



to which the tube foot is attached* Now if a sufficient 



number of tube feet become oriented in this manner, there will be 



a lateral twist of the ray toward the object* Here again the 



