Fig. 263. — Trypanosoma gamhiense, a protozoan of the class Mastigophora, is 

 the cause of tropical sleeping sickness as found in central and western Africa. 

 Observe the dark nucleus and the flagellum on the protozoa as they lie between 

 the blood corpuscles. (Copyright by General Biological Supply House, Inc., 

 Chicago. ) 



NUCLEUS 

 PSEUDOPODIUM 



VEGETATIVE STAGE 



NUCLEI 



ENCYSTED STAGE 



Fig. 264. — Endamoeha histolytica of the class Sarcodina is the cause of human 

 amoebic dysentery. The vegetative stage frequently ingests red blood corpuscles. 

 (From Parker and Clarke: Introduction to Animal Biology, The C. V. Mosby 

 Co.) 



