Soiur PlunoiiK-iii of RcpemTatioii in Limnudiilus and rdatcd Fdi-ius. 10 I 



|i» it. Tu tlii'i'c otluT i!i(li\ idiials tlie intestiiie liad regenerated from 

 (iiK'-lialf [n one segment, tlio regeneratioi! in cacli case occuring sonic- 

 wliore betweeii tlie 12th and the 15th soniitc. The intestine had thcii 

 cDinc in contact with the posterior end of the body upoii which re- 

 u;e!ieration of the latter had agaia begun. 



Tth Series — Feb. IGth 09. The intestine was drawn out froni 

 Umi Worms. Two weoks later in two individuals the intestine cnded 

 at the lOth solnito and the body wall at tlie 12th and the Mth soniites 

 respectively. In anotlier individual the intestine touched the end of 

 the body at the lOth somite but no regeneration had occured. In 

 two others the intestine had regenerated for two segments in each case, 

 starting from the level of the 14th ajid the 15th somites and almost 

 touching the body wall at the lOth and the ITth somites respectively. 

 Oll IMarch llth i. e, nearly four weeks after the date of the Operation 

 conditions were as follows. Those individuals in which the intestine 

 cnded at the lOth somite and the body wall at the 12th and the 14th 

 s')mites respectively showed no signs of regeneration in either the body 

 wall or the intestine. Nor did the worm in which the intestine touched 

 the body wall at the lOth somite show any indication of regeneration. 

 The individuals which had previously regenerated the intestine now 

 showed regeneration of the body wall for some distance. 



8th Series — Feb. 19th 09. Ten worms were operated on betwcen 

 the löth and the 20th somites. On Feb. 26th in six individuals the 

 intestine did not touch the body wall aiid no regeneration of the latter 

 had occured. By March 3rd the intestine had regenerated a short 

 distance, begitniing at the end of the löth and the 17th somites respec- 

 tively, but it did not yet toucii the body wall and no regeneration of 

 the latter had occured. In four other individuals the intestine had 

 regenerated about one-half segment (beginning at the 14th, 15th and 

 IGth somites respectively) and had touched the body wall. After this 

 regeneration of the body wall had taken place. Nine days later all of 

 the above individuals had formed some new somites. 



9th Series — Feb. 20th 09. At about the 15th somite the intestine 

 was drawn out of ten worms. On Feb. 27th four individuals were 

 ^till alive and in these the intestine did not touch the end of the body 

 and no regeneration had begun. By March 6th in two of them the 

 intestine had regenerated for one-half segment begiiming at the level 

 of the 13th and the 14:th somites respectively and it had touched the 

 body wall at the posterior end after which the body wall had begun 

 to regenerate. In two other individuals the intestine had begun to 



26* 



