400 F. TT. Ivrcckcr. 



intrstiue was not in (•.ontuct witli tlie Ix.dy wall. A week later in tlirec 

 of tliese individiials tlie intestine toiiclied tlie posterior end of tlie body 

 and an anal opening liad been formed. One individual still sliowed no 

 external signs of regeneration but sections revealed tlie fact that the 

 intestine liad begun to regenerate. 



4tli Series — Feb. 9tli 09. The intestine was drawn out at about 

 the 15th somite from ten worins. Eight days later five individuals 

 liad constricted off the enipty portion and regeneration had begun. 

 In four individuals the intestine did not touch the body wall and there 

 was no regeneration at the posterior end of the body. One showed 

 an interesting state of affairs; the last somite had no intestine but the 

 intestine had come in contact with the body wall sonie distance ante- 

 rior to the end of the body and regeneration had begun at this point. 

 Hardly more than an anal opening had been formed. Unfortunately 

 this worm died within the next few days. On Feb. 25tli one individual 

 was still alive ; its intestine did not touch the body wall and no regene- 

 ration was noticeable. A woek later the intestine had regenerated to 

 the posterior end. 



5th Series — Feb. lltli 09. The intesthie was removed from ten 

 Worms. Five of these were alive a week later. In two individuals 

 the intestine was very close to the posterior end and in another re- 

 generation had begun. In two other individuals the intestine was one 

 and a half and two somites respectively from the posterior end and 

 no regeneration had occured. In one of these a large ovum had slipped 

 down between the end of the intestine and the posterior end of the 

 body completely filling the spacc. In another set of w(jrms operated 

 upon at the same time two individuals also had the space betvreen the 

 end of the intestine and the posterior end of the body completely filled 

 with a large ovum. 



Gth Series — Feb. 15th 09. Ten individuals were operated upon 

 at about the lötli somite. One week later nine were alive, the intes- 

 tine did not touch the body wall in any of them and in none had the 

 body regenerated. Two weeks later all were still alive. In four of 

 them the intestine was in contact with the end of the body and re- 

 generation had begun. In five of them the intestine was from one 

 half to two Segments from the posterior end of the body and no re- 

 generation had occured. Ten days later i. e. almost four weeks after 

 the Operation, two individuals still showed no signs of regeneration 

 either of the intestine or the body wall and in both cases the intestine 

 ended at the lOth somite leaving two intestineless somites posterior 



