Behavior and Form 171 



ever, take part in this active extension, but the oral 

 side is the more active and soon it may be seen 

 to push around the anterior end of the body, and 

 its myonemes and cilia are thus brought into the 

 characteristic curvature which is found at the an- 

 terior end of the entire organism. 



Fio. 1. Regeneration of posterior piece of Loxophyllum. The 

 dotted line indicates the direction of the cut. ' The figures 2, 

 3, 4, etc., representing the successive stages of the process, 

 show the gradual stretching of the ciliated margin, m, mouth. 



If the cut is made obliquely (Fig. 2) so as to 

 limit considerably the extent of the oral side, the 

 same method of regeneration is followed, the oral 

 side is gradually stretched out so as to form the 

 oral side and anterior end of the new individual. 



In the process of regeneration here followed the 



