PROTOZOA IN THE DIGESTIVE TRACT 11 



ent in the endoplasm are usually at various stages of 

 disintegration (Fig. 1, --4). The nucleus is spherical, cir- 

 cular in outline, and measures 4-7m in diameter. It is hicrhlv 







o 



9:0 



*C 



0CJ 

 V 6 



a^ 





o 



' 7 9 



Fig. 1. Entamoeba histoh/tica. X 1150. (original) 



1. A lixing trophozoite. 



2-4. Stained amoebae, highly spread out. 



5. A fresh cyst. 



6-9. Stained cysts. 



vesicular. There is a centrally located endosome which 

 may be surrounded by an ill-defined achromatic reticulum. 

 The chromatin granules are e\enh distributed o\'er the 

 inner surface of the nuclear membrane, and often referred 



