248 



MACROMOLECULAR COMPLEXES 



Fig. 14. Electron micrograph of the innermost layer of Chaetomorpha me- 

 lagonium wall. Note the linear files of aggregated granules oriented at right 

 angles to the microfibrils of the last lamella deposited and therefore parallel 

 to those of a lamella about to be deposited. These are the remnants of a 

 much more extensive system. Shadowed Pt. X 20,400. 



is the innermost one lying next to the cytoplasm, and very few 

 microfibrils of the next lamella have yet been synthesized. These files 

 cannot therefore represent debris lying between microfibrils which 

 have been stripped away. When microfibrils of the new lamella do 

 appear, they appear to be embedded in this material and sometimes 



