298 PROTOZOOLOGY 



and concluded that Enteromonas and Tricercomonas are one and 

 the same flagellate. 



E. hominis da F. {T. intestinalis W. and 0) (Figs. 135, k; 136). 

 Trophozoites 4-lOju by 3-6ju; nucleus circular or pyriform, with a 

 large endosome, near anterior end; 4 flagella take their origins in 

 blepharoplasts located close to nucleus; cytoplasm vacuolated or 

 reticulated, contains bacteria; cysts ovoid, 6-8ju by 4-6m; with 1, 2, 

 or 4 nuclei; commensal in the lumen of human intestine; found in 

 diarrhoeic stools. Widely distributed. 



Genus Copromastix Aragao. Four anterior flagella equally long; 

 body triangular or pyramidal; coprozoic. 



C. prowazeki A. (Fig. 135, I). About 16-18/x long; in human and 

 rat faeces. 



Fig. 137. Chilomastix mesnili, X1150 (Kudo). 1, a living trophozoite; 

 2-4, stained trophozoites; 5, a fresh cyst; 6, a stained cyst. 



Family 3 Streblomastigidae Kofoid and Swezy 



Genus Streblomastix K. and S. Spindle-form; with a rostellum, 

 the anterior tip of which is enlarged into a sucker-like cup; below the 

 cup are inserted 4 equally long flagella; extremely elongate nucleus 

 below rostellum; body surface with 4 or more spiral ridges; in termite 

 gut. One species. 



S. strix K. and S. (Fig. 138, a, h). 15-52m by 2-1 5m; 4-8 spiral 

 ridges; blepharoplast in rostellum; in Termopsis angusticollis. 



Family 4 Chilomastigidae Wenyon 



Four flagella, one of which undulates on body surface. 



Genus Chilomastix Alexeieff. Pyriform; with a large cytostomal 

 cleft at anterior end; nucleus anterior; 3 anteriorly directed flagella; 

 short fourth flagellum undulates within the cleft; cysts common; in 

 intestine of vertebrates. Several species. 



C. mesnili (Wenyon) (Fig. 137). The trophozoite is oval or pyri- 

 form; 5-20)Lt (majority 10-15)u) long; jerky movements; a large 



