152 HANDBOOK OF PROTOZOOLOGY 



pyriform. In the intestine of mammals and insects, Cytostome 

 comparatively large. Nucleus anterior. Cysts are pyriform or 

 ovoidal. 



Embadomonas intestinalis (Wenyon and O'Connor) (Fig. 

 56, o~q). In man. 



Embadomonas agilis Mackinnon. In the gut of trichopteran 

 and tipulid larvae. 



Genus Phyllomitus Stein. Body oval, cytostome large and 

 conspicuous, with two unequal flagella which are united by a 

 membrane. Fresh water and coprozoic. 



Phyllomitus undulans Stein (Fig. 56, r). Body small 5 to 

 21 microns long. 



Genus Colponema Stein. Body small, less than 30 microns 

 long. Constant in form; ventral furrow conspicuous and widens 

 at the anterior end. One flagellum arises from the anterior 

 end and the other from the middle of body. One or two con- 

 tractile vacuoles. Fresh water. 



Colponema loxodes Stein (Fig. 56, s). Body up to 30 microns 

 long. 



Genus Cercomonas Dujardin. Biflagellate, both flagella 

 arising from the anterior end of body. One directed anteriorly 

 and the other runs backward over the body surface, becoming a 

 trailing flagellum. Nucleus pyriform in shape and connected 

 with the basal granules of the flagella. Spherical cysts uni- 

 nucleate. Fresh water and coprozoic. 



Cercomonas longicauda Dujardin (Fig. 56, /, ii). Body pyri- 

 form and 5 to 20 microns long. Multiplication by binary 

 fission. Fresh water. Often coprozoic. 



Cercomonas crassicauda Dujardin (Fig. 56, v). Body about 

 10 to 14 microns long. Habitat similar to the last mentioned 

 species. 



Family 9 Trimastigidae Senn 



Incompletely known forms with three flagella, of which 

 one is directed anteriorly and the other two posteriorly. Body 

 bilaterally symmetrical. No cytostome. Other structures un- 

 known. Free-living in fresh water. 



Genus Trimastix Kent. Ovate or pyriform. Contractile 

 vacuole conspicuous. 



