POLYMASTIGINA 



3S9 



8.5/i by 5.7^; axostyle long, protruding 1/3-1/2 the body length 

 from the posterior end; of 3 flagella, one is longer and less active 

 than the other two; in the faeces of man. Its remarkable adapta- 

 bility observed by Cleveland was noted elsewhere (p. 34). 



Fig. 166. a, Tritrichomonas foetus in life, X1330 (Morgan and Noland); 

 h, a stained T. foetus, X1765 (Wenrich and Emmerson); c, d, T. muris, 

 X2000 (Wenrich); e, T. batrachorum, X1465 (Bishop); f, g, T. augusta, 

 X 1455 (Samuels) ; h, T. brevicollis, X2000 (Kirby) ; i, j, Pseudotrichomonas 

 keilini, X2200 (Bishop). 



T. muris (Grassi) (Fig. 166, c, d). Fusiform; 10-16/* by 5-10/*; 3 

 anterior flagella short, posterior flagellum extends beyond body; 

 axostyle large, its tip protruding; in the caecum and colon of mice 

 (Mus, Peromyscus) (Wenrich, 1921) and ground squirrel (Citellus 

 lateralis chrysodeirus) (Kirby and Honigberg, 1949). The organism 



