66 



Charles Zeleny. 



c 



F 



G 



Fig. 23. 



A, B — Hydroides uncinata. Regenerating branchiae and opercula at anterior cut surface after trans- 

 verse section between fourth and fifth thoracic segments (X93). A — 13 days after operation. B — 

 14 days after operation. C — H. uncinata. Regenerating branchia? and opercula at anterior cut surface 

 after transverse section between first and second thoracic segments, 18 days after operation ( X 60). 

 D — Dorsal view of Apomatus ampuUifera showing functional and rudimentary opercula (X5). 

 Pinnules not represented. (See also Fig. 6 d, e, f). 



E, F, G — Apomatus ampullifera. Regenerating branchiae and opercula at anterior cut surface after 

 transverse section between the third and fourth thoracic segments, 23 days after operation (X60). 

 E — Dorsal view of both branchial groups. F — Left group as viewed from right side. G — Right group 

 as viewed from left side. 



