3l6 THE BIOLOGY OF STENTOR 



portion of white polymorphus which had been grown in the dark 

 and contained few if any chlorellae (unpubUshed). Even when the 

 portion of polymorphus was relatively small there occurred an 

 aggregation of the pigment granules of coeruleus into splotches 

 which later disappeared so that the fusion complex became entirely 

 colorless and very much resembled in general appearance the 

 white polymorphus stock. These combinations could regenerate, 

 reorganize and even divide. They also showed several interesting 

 abnormalities (Fig. 90A). In some cases the form of the cell became 

 abnormally elongated and occasionally this also led to a complete 



Fig. 90. Abnormalities from grafting a small polymorphus to 

 a large coeruleus, 



A. Abnormal form with granular core, a: Half a polymorphus 

 engrafted, with cytoplasm and nucleus, b: Aggregations of 

 coeruleus pigment as graft causes loss of pigmentation ; mouth- 

 parts excised, c: Regeneration of colorless chimera resulting. 

 d: Snake-like form with mass of colorless granules and irregular 



distribution of nuclear nodes. 



B. Bleaching and failure to form membranelles. a: Feeding 

 organelles of grafted polymorphus resorbed, coeruleus fading, with 

 splotches of pigment granules, h: Chimera now colorless, with 

 half-length adoral cilia which start and stop together but show 

 no metachronal beating nor organization into membranelles. c: 

 Reorganized animal may have longer peristomal cilia but still no 

 membranelles. Eight large nuclear nodes are seen. Specimen 



died on day 7 in isolation on slide. 



