78 



Charles Zeleny. 



B 



Fig. 25. 

 Apomatus ampullifera. A — Operation: Branchial circlets cast off at breaking joint. Body intact. 

 Figure of three most dorsal branchia of right side 9 days after operation. No opercular differentiation 

 (X45). B — Operation: Same as in A. Figure of regenerating right branchial circlet 6 days after 

 operation. No opercular differentiation. C — Left branchial circlet of same ( X 62). D — Opera- 

 tion: Branchial circlets thrown off at breaking joint. Body posterior to third thoracic segment removed. 

 Eight days after operation. Note opercular differentiation ( X 62). E — Operation: Same as D, 

 except that thoracic cut is at second segment. Figure shows the regenerating left branchial circlet 6 

 days after operation. Note beginning of opercular enlargement. 



