744 



TEXTBOOK OF ZOOLOGY 



moeha histolytica (Fig. 391), which invades and destroys the intestinal 

 lining, thns causing amoeljic dysentery; Endamoeba coli, a harmless 



Fig. 388. — Tsetse fly, Glossina, the transmitting- agent for trypanosoma, which 

 causes African sleeping sickness. (Reprinted by permission from Introduction to 

 Human Parasitology by Chandler, published by John Wiley and Sons, Inc.) 



Fig. 389. — Balantidmm coli, an infusorian parasite of the intestine. Active 

 form from intestine. c.iK, anterior contractile vacuole; cyt., cytostome ; f.v. food 

 vacuole ; n, nucleus. (Reprinted by permission from Introduction to Human 

 Parasitology by Chandler, published by John Wiley and Sons, Inc.) 



commensal in the intestine ; and Endamoeha gingivalis, a very common 

 parasite in the human mouth, usually harmless but sometimes ap- 

 parently injurious to the gums. Examples of parasitic Mastigophora 



1 



