50 



THE BIOLOGY OF STENT OR 



^3 



a be 



Fig. 38. Synchronization of primordia within a graft complex. 



A. a: Anlage of a stage- 1 regenerator excised and patch with 

 stage-3 regeneration primordium implanted, b: Stage-3 anlage 

 arrested while an extension occurs adjacent to wide-stripe area 

 of host which forms a new primordium, both the latter in stage i . 

 c: All three anlagen synchronous by stage 4. d: Primordia join, 

 with metachronal waves of membranelles continuous in direction 

 of arrows. Implanted anlage, with its extension, forms a V-shape 

 which undergoes stomatogenesis at the point and a doublet 

 stentor is formed. 



