ORIGIN OF THE CEJVTKOSOAfE. 279 



can in any way be brought into harmony with the structure 

 and function of the aster. 



A striated muscle cell reduced to its simplest form may be 



\ 



Fig. d. Acanthocystis tur/acea, with an aster-like structure in the center of the body, with it* 

 rays forming the axial filaments of the pseudopodia. (After Richard Greeff .) 



diagrammatically represented as in Fig. 7. A part of the cell 

 is occupied by undifferentiated granular protoplasm the sar- 

 coplasm (s) and the rest of the cytoplasm is converted into 

 a series of contractile filaments arranged in parallel rows, thus 

 forming the myoplasm of the muscle cell (;;/). Each filament 

 has varicosities which receive different names according to 

 their position. These varicosities are deeply stainable, and 



