THE SENSORY RESPONSES OF CHITON 



177 



the last one had been marked, eight of these still inhabited the 

 restricted region which was examined. The occasional arrival 

 of a new chiton in this area is consistent with the gradual and 

 fluctuating disappearance of the marked individuals. Perhaps 

 the handling and stimulation due to cutting for marking pur- 

 poses caused an initially increased wandering of the marked 



TABLE 1 

 Concerning the migration and 'homing habits' of Chiton 



specimens. The general result is clear, however: Chiton is not 

 stationary, it does move about to some extent, but adult ani- 

 mals, such as those used in this experiment, do not move fre- 

 quently from place to place. 



Further observations showed that there is probably some 

 correlation with age in the matter of migration. The youngest 



