112 



THE BIOLOGY OF STENTOR 



Striping breaks into many patches the whole cell becomes knobby 

 when expanded (see Fig. 71B). Likewise, longitudinal fragments 

 remain thin and elongate until they recover the normal comple- 

 ment of stripes (see Fig. i2a). If two stentors are grafted together 

 at random, there is no arrangement from which they cannot shift 

 and integrate into a normal shape (Fig. 28b) (Tartar, 1954). 



Fig. 28. Pertaining to cell shape in S. coeruleus. 



A. Any discontinuity in the lateral stripe pattern results in 



corresponding modification of cell shape. 



B. Even head-to-head telobiotics can reconstitute a single 

 normal shape by jack-knifing and fusing. (After Tartar, 1954.) 



C. Doublets with mouthparts proximate tend to form double 



"cleavage" shapes. 



Doublet stentors are usually wide, but if they become single, they 

 or their progeny recover the normal number of lateral stripes. 

 When doublets persist and retain essentially two sets of body 

 striping there is a strong tendency to develop a Siamese twin shape 

 (c), showing again that cell shape depends on the disposition of 

 the ectoplasmic striping. 



