ORIGIN OF THE CENTROSOME. 



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. 6. — Acanthocystis tur/acea, with an aster-like structure in the center of the body, with its 

 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 is) — 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 int). Each filament 

 has varicosities which receive different names according to 

 their position. These varicosities are deeply stainable, and 



