132 



C. M. CHILD. 



(V) Oral end not expanded ; no tentacular ridge or tentacles 

 visible. 



Controls. Marginal tentacles 23 mm. (Fig. 3, one of controls). 



December ij. - - 26 days after section. Experimental pieces. 

 Reopened daily since December 12, but a and b have been 

 slightly distended at times. During the course of regeneration 

 the mouth has formed in the usual manner, though more slowly 



FIG. 



FIG. 5. 



FIG. 3. 



\ 

 FIG. i. 



FIG. 4. 



than in the controls, consequently water is now taken in much 

 more rapidly than in the earlier stages. 



(a) Oral end slightly expanded ; marginal tentacles 3-4 mm., 

 blunt and less slender than normal ; no labial tentacles visible 



(Fig- 4)- 



(b) Oral end slightly expanded; marginal tentacles 2-3 mm., 



blunt and less slender than normal ; no labial tentacles. 



(c) Oral end not expanded ; marginal tentacles 1-2 mm., 

 blunt ; no labial tentacles. 



