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INTESTINAL FLAGELLATES AND CILIATES 



(Fig. 29C), according to Wenyon, the trailing flagellum is at- 

 tached to the side of the body as far as the posterior end, usually 

 being continued as a free flagellum. According to others Cer- 

 comonas has only a single flagellum, the free one at the anterior 

 end. Bodo (Fig. 29B) has two free flagella, one waving anteriorly, 



FIG. 29. Bi-flagellated parasites A, Prowazekella, separation from Bodo 

 proposed on account of absence of parabasal body. B, Bodo, note parabasal body 

 (par. b.). C, Cercomonas; note trailing flagellum attached to side of body. This 

 is not recognized as a flagellum by some workers. X 2000. (After Wenyon.) 



the other trailing behind; some species not showing a parabasal 

 body have been placed in a genus Prowazekella (Fig. 29A) of 

 doubtful validity. Most of these flagellates are coprozoic, i.e., 

 saprophytic faecal protozoa, rather than true parasites, the cysts 

 being accidentally ingested with water or food. 



A slipper-shaped flagellate, Embadomonas (Waskia) intestinalis, 

 first described by Wenyon and O'Connor in Egypt, and since 

 recorded by Kofoid, Kornhauser and Plate in American troops 

 returning from overseas, and by Hogue from a person who had 

 never been out of the United States, is probably a true human 

 intestinal parasite. It is only from 4 to 8 p. in length, has a rather 

 large cytostome, an anterior nucleus, and two flagella, one of 

 which is short and thick and lies in the cytostome. The cysts 

 are very small and pear-shaped. A larger species, Embado- 

 monas sinensis has been found by Faust in China. 



Multi-flagellate Intestinal Protozoa 



Trichomonas hominis. Of the several flagellates which 

 have been found in the human digestive tract and faeces, Tricho- 

 monas is the commonest. It makes its home in the upper 



