GENUS: TRICERCOMONAS 



635 



oval in outline, and measure 6 to 8 microns in length by about half this in 

 breadth (Fig. 261, 5-8). In stained films it is seen that the cysts have one, 

 two, or four nuclei. At the four-nuclear stage the nuclei are arranged 

 in pairs at opposite ends of the cyst. The infections which were studied 

 in Egypt did not persist for long periods. In one case the flagellate was 

 seen daily for nine days, when it disappeared. 



It should be mentioned here that in their work on the intestinal 



Fig. 



^61. — Tricercomonas intestinalis from the Human Intestine (x 2,600). 

 (After Wenyon and O'Connor, 1917.) 



1-4. Flagellates as seen in living condition. 

 9-10. Flagellates in stained films. 



5-8. Encysted forms in stained films. 

 11. Dividing form. 



Protozoa, Dobell and O'Connor (1921) came to the conclusion that the 

 E. hominis described from man by Fonseca, and which has been referred 

 to above (p. 306), is the same as T. intestinalis. Jepps (1923) refers to the 

 flagellate seen by her in Malaya as E. Jiominis. It is assumed by Dobell and 

 O'Connor that Fonseca and other observers have overlooked the posterior 

 flagellum, and have erroneously supposed that only three anterior flagella 

 are present. This is, of course, quite possible, as the determination of the 



It is, however, 



