250 



C. M. CHILD. 



little difference between the two ends, except that growth of the 

 membrane is more rapid at the oral end. In Fig. 1 1 1 a portion 

 of the oral end is shown more highly magnified. In this case 

 the abrupt transition from the pigmented body-wall to the almost 

 colorless new tissues is evident. From this figure it is also seen 

 that the margin of the old body-wall is somewhat crenated by 



fine folds and wrinkles, which, however, are not regular in size 

 and form, and do not represent the early stages of the new ten- 

 tacles. The slight folds indicate more or less exactly the re- 

 gions where the mesenteries are attached and the bulging areas 



1 In Figs, ic, 15, 16, 18 the pigmentation of the body- wall is indicated. 



