90 Papers from the Marine Biological Laboratory at Tortugas. 



Table 3. — Specific rates of regeneration ■from each stump of two removed arms on 



the same individual. 



Table 3 gives the histories of each arm in two individuals which had had 

 two of their mouth-arms cut away. The individual A shows after 23 

 days a greater variation between the rates of regeneration from its two 

 arm-stumps than is shown in table 2 between the average rates of all the 

 medusae with one, two, three, five, and four (alternate) arms removed. At 

 the thirty-fifth and thirty-eighth days one of the arms has grown twice as 

 fast as the other. The B individual of table 3 also shows a distinct dif- 

 ference in regeneration rates between the two arms. 



Table 4. — Specific rate of regeneration from each stump of four removed arms on 



the same individual. 



Table 4 gives the histories of each of four arms in two individuals. A 

 and B. Here again one finds as much variation in the regeneration rates 

 as is shown between tlie average rates for individuals with different degrees 

 of injury in table 2. 



Table 5 records the rates for each of the six regenerating arms in two 

 individuals, A and B. The individual A shows a variation in rate of regen- 

 eration between the first two arms in the table and the last one which is 

 greater than the difference in average rates of regeneration between almost 

 any of those variously injured medusae given in table 2. The individual B 

 of table 5 also shows a variation in the rates of regeneration from its sev- 

 eral arm-stumps. 



