86 ELECTRON-MICROSCOPIC STRUCTURE OF PROTOZOA 



Plate IX 



Fig. 30. Section through part of axopodium of Actinosphaerium 

 nitcleofiltim, showing filaments of axial rod, canalicular endoplasmic 

 reticulum, a mitochondrion at lower right, and vacuoles containing 

 dense granules at top left. X 40,000. From Anderson and Beams, 

 1960. 



Fig. 31. Section through young feeding stage of Gregarina rigida, 

 partially embedded in host cell. Pellicular folds beginning to 

 appear at free end, but no differentiation into ectoplasm and 

 endoplasm, or into anterior and posterior body zones. Honeycomb 

 layer of nuclear cortex lacking. Parasite cytoplasm has shrunk away 

 from closely apposed membranes of host and parasite. X 20,000. 

 From H. W. Beams and E. Anderson, unpublished. 



Fig. 32. Section through contact surfaces of two individuals of 

 Gregarina rigida. Note membrane layers, fibrils at tips of pellicle 

 ridges, ectoplasmic network of fine filaments. X 50,000. From 

 Beams, Tahmisian, Devine and Anderson, 1959a. 



