10 



Charles Zeleny. 



was removed, i. e., in all except the first series, this length repre- 

 sents the average length of all the regenerating arms of the individ- 

 ual. In some specimens there is a decrease in the length of the 

 regenerated arm from one period to another. This is due to a 

 gradual disintegration and breaking off of the regenerating arm. 



22 

 days. 



33 

 days. 



46 

 days. 



10 11 12 13 14 15 16 17 18 19 20 



4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 

 Disk diameters in millimeters. 



Fig. 2. 

 Britde-star, Ophioglypha lacertosa. Comparison of lengths of regenerated arms in Series IV (four 

 arms Temo\ed), dotted lines, 'with Series I (one arm removed), uniroi^en /;nes. Upper curves, 22 

 days; middle curves, 33 days; and lower curves, 46 days after operation. The lengths of the regenerated 

 arms are distinctly greater in Series IV than in Series I. 



