162 



BIOLOGY OF THE PROTOZOA 



In Evglena and its allies the fluids of the contractile vacuole do not 

 pass directly to the outside hut are stored for a longer or shorter 

 period in reservoirs which thus function like a bladder. In Cam- 



FiG. 85. — Golgi bodies in Cliiloniotias jmrnmccium {B) and Pardmcciutn caud- 

 atum {A and C). c.v., Contractile vacuole; r, radial canals of Paramecium. (After 

 Nassonov.) 



jxtnella uvihclhita such a reservoir is rei)laced by two definitely walled 

 evacuation canals, while in Pycnothrix the excretory canal is said 

 to be provided with special cilia. 



