504 



C. M. Child. 



branches. No regenerated pharynx was observed. At this time 

 it was noted that the behavior of this piece was slightly different 

 from that of the pieces of the third group. It lay on the dorsal 

 surface less often and sometimes adhered by its margins to the 

 substratum, though progression occurred only occasionally and 

 was very slow, being apparently entirely ciliary. 



C. Figs. 42 and 43 represent the two extremes among the 

 fourTpieces of this group remaining alive. The intestine has 

 penetrated only slightly into the new tissue and no pharynx is 



