Whether this increase is only relative or to what extent it is absolute 

 I am unable to say* 



Eunotion o^ the qtej reflate jji the spread gf, coordination* 

 The function of the step reflex in the spread of coordination 

 ia probably very Jj.iocrtit The pinching of one ray of an Aet^rina will 

 cause prompt negative locomotion with all the tube feet coordinating* 

 If, however, the starfish is inverted there ia little likelihood that 

 the impulse rLll include coordination of all the tube feat, even after 

 the severest pinching* The only difference between the animal* in these 

 two positions io that the tube feet of the inverted starfish are not 

 executing the step reflex because there is no contact stimulation to set 

 it off* I am inclined to think therefore that a state of orientation 

 spreads much raore rapidly <*here the tube feet are executing the step 

 reflex than -ziiere thoy are not* Thtj|_l_a Iso true of Pisa a tor to a lesser/ 

 extent, but in cane 1 of Pycnopodia it seems to make but little difference 

 whether the tube feat are in contact with the substrate or not* The 

 coordinated impulse is easily initiated and very active in this animal* 



the common or usual manner in which the coordinated impulse 

 is formed in starfish is, X think in general accord with the above out* 



~VX+:VV >-> \/~ 



line* There *ra very many species of starfish, each differing more or 

 less in its structures and functions from the other so that ideas de- 

 rived from the study of five or six epeoies might not fit the behavior 

 of all of the thousands known to science* 



1 have sean PycnoBo^A* ?jfl-j 9aatg i r ' Aftt^rinA gjid, ^japt^ria.s, 

 regularly orient to**ard or away from contact and charaleal stimulations 

 (mussdl juice or dilute acid) in the manner outlined above, and 

 a bsam of direct sunlight waa thrown, on the eya-spot of 

 the response was analogous to that to contact. 



Orientation .*& result gf. stimulating thji d 

 ox a. general stf^m^l^ti^n of. ajjj^ thja tube 



