10 THE BIOLOGY OF STENTOR 



duces sufficient mixing. The endoplasm has been described 

 variously as alveolar or reticulate and contains reserve materials 

 in the form of droplets and granules. 



When maximally contracted, stentors become nearly perfect 

 spheres. Most stentors are also capable of remarkable extension. 

 When attached and feeding the body may stretch out to three to 

 six times the diameter of the contracted animal while the feeding 

 organelles expand vv^idely to produce the stentorian or trumpet 

 shape. All the complex structures of the cortical layer are therefore 

 capable of w^ide displacements though maintaining their precise 

 pattern and organization. 



Next we shall consider what is known of the behavior of 

 stentors and then we can deal with the fine points of structure in 

 terms of which this behavior is to be explained and which 

 demonstrate the highly complex and precise achievements of 

 morphogenesis. 



