374 PROTOZOOLOGY ' 



Genus Copromastix Aragao. Four anterior flagella equally long; 

 body triangular or pyramidal; coprozoic. 



C. prowazeki A. (Fig. 156, I). About 16-18/* long; in human and 

 rat faeces. 



Genus Karotomorpha Travis (Tetramastix Alexeieff). Elongate 

 pyriform; body more or less rigid; four unequal flagella at the an- 

 terior end, in two groups; nucleus anterior; without cytostome; 

 parasitic in the intestine of Amphibia. Species (Travis, 1934). 



K. bufonis (Dobell) (Fig. 157, e). Spindle in shape; 12-16/x by 

 2-6/*; in the intestine of frogs and toads. Cytology (Grasse, 1926). 



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 (Kidder) or 6 (Kofoid and Swezy) 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. 157, /, g). 15-52/* by 2-15/*; 4-8 spiral 

 ridges; blepharoplast in rostellum; in Termopsis angasticollis. 



Family 4 Chilomastigidae Wenyon 



Four flagella, one of which undulates in the cytostome. 



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. 157, h-k). The trophozoite is oval or 

 pyriform; 5-20 (10-15)/* long; jerky movements; a large cytosto- 

 mal cleft near anterior end; nucleus, vesicular, often without endo- 

 some; 3 anterior flagella about 7-10/z long; the fourth flagellum 

 short, undulates in the cleft which ridge is marked by 2 fibrils. The 

 cyst pyriform; 7-10/* long; a single nucleus; 2 cytostomal fibrils and 

 a short flagellum; commensal in the caecum and colon (some con- 

 sider also in small intestine) of man. Both trophozoites and cysts oc- 

 cur in diarrhoeic faeces. It is widely distributed and very common. 

 Cytology (Kofoid and Swezy, 1920); cultivation (Boeck, 1921). 



C. intestinalis Kuczynski. In guinea-pigs; 13-27/* by 5—1 1/x (Gei- 

 man, 1935); 8.8-28/* by 6.6-11/* (Nie, 1950). 



C. bettencourti da Fonseca. In rats and mice. 



C. cuniculi da F. In rabbits. 



C. caprae d. F. In goat. 



