Behavior and Form 173 



yielded by further experiments. By making a cut 

 so as to remove all the oral margin with its dif- 

 ferentiated structures we compel the organism to 

 follow a quite different method of regeneration 

 (Fig-* 3)- At first, owing to the absence of the 

 more contractile and extensile elenlents of the oral 



Fig. 3. — Regeneration of Loxophyllum after removal of entire oral 



margin. 



side, the aboral margin in t|ie movements of the 

 animal are pushed farther ahead than the oral. The 

 organism elongates and becomes pushed over 

 toward the oral side. Later, however, the oral side 

 becomes thinned out and more transparent; cilia 

 make their appearance in scattered groups, new 

 trichocysts are developed, and contractile threads 

 appear in the thinned out region. After these vari- 

 ous structures are developed the oral side begins 

 to extend and contract more than the aboral. Then 

 it becomes pushed ahead more and more, and finally 



