150 ELECTRON-MICROSCOPIC STRUCTURE OF PROTOZOA 



Plate XVI 



Fig. 59. Cross-section of flagellum of Pyrsonympha vert ens lying 

 in groove on body surface. Note accessory material between outer 

 flagellar fibrils and membrane. X 50,000. From Grasse, 1956b. 



Fig. 60. Transverse section of axostyle of Pyrsonympha vertens. 

 X 45,000. From Grasse, 1956b. 



Fig. 61. Longitudinal section of anterior end of Pyrsonympha 

 vertens. Rounded, dense body at apex is centrosome. Diverging 

 from it are seen, moving clockwise, dense paraxostyle, striated axial 

 ribbon, and one kinetosome. Conical tip of nucleus at bottom. 

 X 50,000. From Grasse, 1956b. 



Fig. 62. Transverse section of Lophomonas striata at level of 

 nucleus, showing fibrillar nature of calyx bands. Edge of nucleus 

 at left. X 40,000. From Beams, King, Tahmisian and Devine, 1960. 



