Compensatory Regulation. 



Table I. 



Explanation of Table I. 

 The data for the experiments on the regeneration of the arms in Ophioglypha lacertosa after their 

 removal by a cut level with the circumference of the disk. The measurements are in millimeters. In 

 each of the sub-tables the second column gives the disk diameters, the third column the average lengths 

 of the regenerating arms 22 days after the operation, the fourth column the lengths after 33 days and the 

 fifth column after 46 days. In the four last tables (;'. e., in all except Series I) the lengths as given are 

 the averages of all the regenerating arms of the individuals. The numbers under "Remarks" represent 

 the time of death (in days) of specimens which did not outlive the experiment. 



