-47 



vary intenaly appreaeed atato. The neuro tomized ray continued 

 a a before actively moving in its own sector. The gilla were 

 retraoted and tho pedioellariae open, OTer the whole atarfiah 

 while in the region of the out and beyond the gills were out 

 normally and the pedioellanae at reat. On prodding the neurotomiaed 

 ant the gilla drew in, the pedioellanae stood out and opened 

 and the tube feet held fast. This last reaction paaaed off 

 and the noufcotomized arm started locomotion again in ita aeotor. 

 The gilla and pedioellaria remained in the irritated state so 



that the out did not deraark two different areas of gilla and 



and 

 pedioellaria aa it had before/<*s it did now with the tube feet* 



X believe, therefore, that neural oonneotion for the 

 apreading of an Impulse aoroaa the out, either through the 

 dermal nerve net or through an unout portion of the ambulaoral 

 oord, was entirely absent. 



The eaaentials of these eaperiments were repeated on a 

 nuaber of animals, with very similar resulta. Asterina 



responds in thia way but rather less completely than Pisa a tar. 



\r\ w f?o~ 

 An active atarfiah with a e anterior (aee pr"T*5) 



wma picked up quicly and the raya bod neurotomized* The 

 animal was aet on the aide of the aquarium with the intact raya 

 (a ) directed downwards. Locomotion followed a e down the aide 

 and across the aquarium. S e d presented refractory tube feet 

 and locomotion was jerky as these tube feet were pulled loose. 

 Later, when the animal had progressed about 6 cm coordination waa 

 fairly well established but not very active. Aa the refractory 

 tube feet were pulled loose they retracted and did not react at 

 ally for sometime. Neighboring tube feet, however, showed 

 diminished tendency to attach tightly and were more apt to 

 coordinate. Locomotion waa alow at first but later more rapid. 



