RECONSTITUTION IN DISARRANGED STENTORS 22^ 



Fig. 64. Transient autonomous disorganization of shape pattern. 



A. a: Left half of stage-3 divider rotated on right, h: Fission 

 blocked but further primordium formation, leading only to 3 

 incomplete oral differentiations in addition to original mouth- 

 parts {x). c: Reorganized singly, with fair stomatogenesis and 

 good striping, d: On day 4 the lateral striping except in the oral 

 meridian was broken into patches quite as if minced. This 

 condition was later corrected to normal; and the specimen 

 eventually divided, one of the products also then dividing, 



therefore apparently an instance of postponed fission. 



B. a: Sector with stage-3 regeneration primordium and 8 

 nuclear nodes grafted transversely onto an enucleated stage-3 

 regenerator. Both primordia were, paradoxically, resorbed. 

 Two new anlagen appeared, joined and gave fair differentiation 

 of feeding organelles (6) but the striping became noticeably 

 patchy, c: Reorganized now with striping aligned but with four 



tail-poles. Further normalization occurred later. 



recalls, in a possibly significant parallel, the normal fragmentation 

 of the cortical striping and kinetics in large forms of the ciliate 

 Ichthyophthirius. Patches so produced then become the ciliation 

 of multiple daughter cells, according to the account of Mugard 

 (1948). But in Stentor, the animals seemed to be able to recover 

 after passing through a period of self-trituration, as they do from 

 minceration. 



