Sonu- Phononu'ua of Rcgciicialioii in l-iimnuliilus :ind related Koiius. lO'J 



(Fiij. 1). >^1i(irtly after an Operation considorable blood is preseiit in 

 tke coeloiu but this soon disappears. In case quitc a bit of the in- 

 testine has been removed this unorcjanized mass of cells may extend 

 for half a somite or moro toward the anterior end. 



In a Short timc aftor the Operation the absence of the intestine 

 lias a very reniarkabk^ effect upon the tissues of the body wall >sur- 

 roundinf; the wound as well as u])on the cells between the intestine 

 ■dud the end of the body. Miiscle fibers, leucocytes, connective tissue, 

 sonu' elilorogogiie cells and, to a certain extent, ectoderm cells also 

 all unite in forming a Strand which usually extends from the region 

 of the wouiul to the intestine. (,'hiefly muscle fibers and peritoneal 

 cells conipose the Strand. The cells are much attenuated in an antero- 

 posterior direction. From all parts of the cnt surfaces the muscle 

 fibers wander into the coelom, the longitudinal fibers from all sides 

 of the cavity converging toward and meeting at a point in the 

 coelom approximately on the longitudinal axis of the body and then 

 extending anteriorly to the intestine. The peritoneal cells about 

 the wound join the muscle. Other material such as leucocytes, con- 

 nective tissue or chlorogogue cells which happen to be in the path of 

 the fibers are woven in witli them and aid in forming a more or less 

 solid mass (Fig. 3). Not all cells become such an intimate part of 

 the Strand; this is particularly true of the large chlorogogue cells. 

 These frequently act as obstructions between which portions of the 

 Strand thread their way finally to unite and form a common central 

 Strand. At times the body Avall becomes entirely stripped of its mus- 

 culature, there being nothing but a thin layer of ectoderm left. 



Although the Strand generally extends between the posterior end of 

 the intestine and the posterior end of the body wall still there are 

 several exceptions to this. A Strand may extend from the posterior end 

 f»f the intestine to a lateral point f)n the body wall; from the posterior 

 end of the body wall to a lateral point on the wall farther anterior or 

 irom a lateral point on the wall into the coelom. In Figures 4 and G 

 such Strands are shown. In Figure 4 the body wall is seen to bend 

 sharply outward and from the angle thus fornied a Strand composed 

 almost entirely of muscle fibers runs posteriorly in a diagonal direction 

 toward the median line. In Figure 6 a Strand of jnuscle fibers and 

 peritonial cells extends from a lateral point on the body wall into the 

 coelom. It appears to be the case that wherever the continuity of the 

 musculature is broken the fibers are set free from sorae tension thus 

 permittiiig them to move out into the coelom. One of the interesting 



