112 



PROTOZOOLOGY 



different species. Just as flagellates show various types of move- 

 ments, so do the ciliates. Individual cilium on a progressing ciliate 

 bends throughout its length and strikes the water so that the organ- 

 ism tends to move in a direction opposite to that of the effective 

 beat, while the water moves in the direction of the beat (Fig. 47, 



Fig. 46. Diagrams illustrating ftagellar movements of Monas sp. 

 (Krijgsman). a-g, rapid forward movement (a, b, optical image of the 

 movement in front and side view; c, preparatory and d, e, effective stroke; 

 f, preparatory and g, effective stroke); h-j, moderate forward movement 

 (h, optical image; i, preparatory and j, effective stroke); k-o, undulatory 

 movement of the fiagellum in backward movement; p, lateral movement; 

 q, turning movement. 



