PROTOZOA AS CELLS 65 



Plate VII 



Fig. 26. Part of normal macronucleus of Colpidium campylum, 

 showing double envelope, presumed chromatin bodies and one 

 nucleolus at right, x 22,500. 



Fig. 27. Part of normal macronucleus of Paramecium aurelia, 

 showing double envelope, numerous small chromatin bodies, and 

 several larger nucleoli. Note abundant Palade particles in cytoplasm. 

 X 21,700. From R. V. Dippell, unpublished (micrograph by 

 K. R. Porter). 



Fig. 28. Section through part of macronucleus of the suctorian 

 ciliate, Tokophrya infusionum, from an overfed individual. Crystalline 

 arrangement of chromatin material seen in longitudinal (parallel 

 lines) and cross (honeycomb) section; normal chromatin body, at 

 top, is dense and spongy. X 75,000. From Rudzinska, 1956. 



