-75- 



Records were taken (column 1.) of the direction of locomotion 

 before righting and (eoluon 2) tha a IMS that, after in verting, 

 thf animal, first twisted and bent down tow-rd the substrate* 

 These two findings were compared in each experiment and the shift 

 in either direction of the leading rays or "physiological anterior" 

 set down in oolumn 3* The turning down of certain rays is 

 usually followed ( rscpac or preceded ) by a lifting up of others* 

 The rays that lifted up free of the substrate ** but not those 

 that were oriented on the substrate, in the way described ibova, 

 to walk over the initiating rays* were next recorded (column 4). 



The ray a that turned down -were not, always, of course the 

 same is those that the animal uaea ia righting* ihese latter 

 are listed in ooluran 5, and the shift of anterior from the 

 direction bef re inverting to the araa used in righting is 

 listed in column six* The anterior after righting is listed in 

 column 7 and its shift from the direction before inverting is 

 listed in column 8. Blue the shifts of anterior, listed in 

 columns 3,6 and 8 refer to the original anterior before inverting* 



A comparison of the averages obtained here* and those drawn 



from Colt'a data shows that careful manipulation of the starfish 



e. 

 and the use of a lirge number of individuals riduces the shift 



of anterior considerably. .\s shown by the rays that are first 

 turned down, the anterior at the beginning of righting feas 

 shifted *38 of in inter-radius on an average of 64 observations* 

 As shown by the rays on which the animal ri t #its ) the anterior 

 during the righting reaction has shifted *6 of an inter-radius from 

 where it was before the animal was inverted. After righting, the 

 anterior shifts slightly back Coward its original direction, as 

 shown by the fact that the average shift after righting is less 

 than during righting* This shows more markedly in the average 



