222 



THE BIOLOGY OF ST EN TOR 



Fig. 63. Reconstitution in minced S. coeruleus. 



A. Realignment and rejoining of pattern, a: Operation, 

 consisting of repeated cutting with point of a glass needle until 

 lateral striping is reduced to scattered patches. Holdfast and 

 feeding organelles were removed, b: Patches, numbering about 

 50 are at first separated by endoplasm. c: Patches healing 

 together and cell-shape knobby because of striping running in 

 multiple directions, d: Indication of a tail pole and axis with 

 patches aligning in parallel and joining when of the same type 



(e.g. wide-stripe areas with wide striping). 



B. Subsequent regeneration in a similar case. An oral 

 primordium appears as soon as a sufficient locus of stripe-width 

 contrast was re-established (6 hours) and the anlage follows the 

 course of this l.s.c. Second sketch shows nearly normal 



specimen one day after operation. 



C. Intact head grafted to minced mass of two stentors minus 

 heads and tails. Three days later the specimen became as shown, 

 striping normalized on ventral (oral) side, still irregular 

 anteriorly on dorsal side. Axis seems to be established by the 

 engrafted head but head and bordering stripes apparently have 



