C. M. CHILD. 



esophagus, as in the more distal regions, or being only slightly 

 developed, as in the more proximal, attenuated region. 



The removal of the free borders brings about longitudinal 

 contraction of the injured mesenteries and so approximates the 

 oral and aboral cut surfaces of the body wall. This contraction 



4 



FIGS. 1-4. 



is merely a special case of the wound contraction so characteristic 

 of the actinians, which I have described for Cerianthus and 

 Harenactis. 1 In my earlier experiments I removed merely such 



JChild, '03, "Form Regulation in Cerianthus, I., The Typical Course of Re- 

 generation," BIOL. BULL., V., 5, 1903. 



'04, "Form Regulation in Cerianthus III., The Initiation of Regenera- 

 tion," BIOL. BULL., VI., 2, 1904. 



'08, "Form Regulation in Cerianthus czstuari," BIOL. BULL., XV., i, 

 1908. 



