No. 584] REGENERATION IN ENCHYTRJEUS 



501 



the fresh-water surroundings. These facts show that 

 the worms regenerate in both fresh and salt water. This 

 is not surprising, since individuals of this species are 

 normally found both on the seashore, where they live in a 

 salt-water environment, and also in earth moistened with 

 fresh water. Furthermore, with the exception of the sa- 



linity of the water used to moisten the worms, the worms 

 which regenerated in the fresh-water surroundings were 

 probably subjected to about the same conditions as those 

 which regenerated in the salt-water. Therefore, the sa- 

 linity of the water in the environment does not seem to 

 affect the rate of regeneration. The data used in plotting 



