172 ELECTRON-MICROSCOPIC STRUCTURE OF PROTOZOA 



Plate XIX 



Fig. 69. Photomicrograph of silver-impregnated Colpidium 

 campylum. By B. Parducz. 



Fig. 70. Section across primary meridian of Colpidium campylum, 

 showing cilium emerging between adjacent alveoli (arrows) of 

 silverline system. X 43,500. 



Fig. 71. Section across secondary meridian of Colpidium campylum, 

 showing continuous outer membrane and closely juxtaposed 

 alveoli of silverline system. X 60,000. 



Fig. 72. Part of pellicle fragment of sonicated Tetrahymena 

 pyriformis. Empty pellicle is folded back on itself, exposing kineto- 

 some and single kinetodesmal fibril attached to it. X 31,000. From 

 Metz and Westfall, 1954. 



Fig. 73. Pellicle fragment of sonicated Colpidium campylum, 



showing primary and secondary meridians (numbered 1 and 2, 



respectively) and longitudinal fibril band (3). X 11,000. From 



Pitelka, 1961a. 



