58 



PROTOZOOLOGY 



was composed of 7 to 8 cilia. In some instances, the distal portion of a 

 cirrus may show two or more branches. The cirri are confined to the 

 ventral surface in Hypotricha, and called frontal, ventral, anal, 



Cirrus fiber 



Ectoplasmic granules 

 Basal plate of the cirrus 



Kinetosomes of 



component cilia 



Adoral zone 

 Frontal cirri 

 Undulating membrane 



Marginal cirri 

 Ventral cirri 



Anal cirri 

 Caudal cirri 



Fig. 11. a, five anal cirri of Euplotes eurystomus (Taylo'r); b, schematic 

 ventral view of Stylonychia to show the distribution of the cirri. 



caudal, and marginal cirri, according to their location (Fig. 11, b). 

 Unlike cilia, the cirri may move in any direction so that the organ- 

 isms bearing them show various types of locomotion. Oxytricha, 



