506 



Dr. C. Morley Wenyon 

 A _ B 



[March 3, 



c 



Fig. 2. — The Intestinal Flagellates op Man, which, like the amcebje, 



are carried from man to man by cysts which are passed from 



the intestine. (magnified 2000 times.) 



a-c Giardia intestinalis, which lives in the small intestine. 



a, surface view of the flagellate, showing two nuclei, outline of sucker and 



eight flagella and their connections ; b, side view of flagellate ; c, encysted 



form with four nuclei. 



d-p Chilomastix mesnili, which lives in the large intestine. 

 d, flagellate with three flagella, large cytostomal groove containing a fourth 

 flagellum and supported by two marginal filaments and a single nucleus; 

 e, smaller flagellate ready for encystment ; f, encysted form. 



g-i Embaclomonas intestinalis, which probably lives in the large intestine. 

 g and h, two views of the flagellate, showing two flagella, cytostomal groove, 

 and a single nucleus ; i, encysted form. 



j-l Tricercomonas intestinalis, which also probably inhabits the large 



intestine, 

 j, surface view of the flagellate, showing three anterior flagella, and a fourth 

 one which passes over the surface of the body to become a free flagellum 



