POLY MAS TIG ID A 1 6 1 



margin of the undulating membrane, on the base of which there 

 is an axoneme. The axostyle projects beyond the posterior 

 end of body. Cysts have been noted in forms inhabiting animal 

 intestines, but not in the species occurring in man. All para- 

 sitic in the intestine. 



Trichomonas Jiominis (Davaine) (Fig. ()\,d). In the human 

 gut. 5 to 18 microns long. 



Trichomonas elongata Steinberg ( = T. biiccalis Goodey and 

 VVellings) (Fig. 61, e). In the human mouth; about 10 to 20 mi- 

 crons long. 



Trichomonas vaginalis Donne (Fig. 61, /). In the human 

 vagina. Body 10 to 25 microns long. 



Genus Ditrichomonas Cutler. Similar to Trichomonas, but 

 with two anterior flagella. Parasitic. 



Ditrichomonas termitis Cutler (Fig. 61, g). In the gut of 

 the termite, Archotermopsis wroughtoni. 



Genus Giantomonas Dogiel. Somewhat similar to Tricho- 

 monas, but much larger. Three short flagella and a very long 

 flagellum. Axostyle is large and the undulating membrane is 

 well developed. Parasitic. 



Giantomonas herculea Dogiel (Fig. 61, h). In the intestine 

 of the termite, Hodotermes mossamhicus. Body 60 to 75 mi- 

 crons long by 30 to 35 microns broad. 



Genus Myxomonas Dogiel. Body highly amoeboid, with- 

 out any flagella, but with an undulating membrane and a primi- 

 tive axostyle. It is considered as a Trichomonas which lost 

 its flagella and which became amoeboid. Parasitic. 



Myxomonas polymorpha Dogiel (Fig. 61, ^'). In the intestine 

 of the termite, Hodotermes mossamhicus. Reaches 100 microns 

 in length. 



Tribe 2 Diplozoa Calkins 



Genus Hexamitus Dujardin. Body small, more or less 

 pyriform. Two nuclei near the anterior end. Six anterior and 

 two posterior flagella. Cytostome indistinct. Encystment. 

 Free-living. Several species. 



Hexamitus inflatus Dujardin (Fig. 62, a). 15 to 25 microns 

 long. Stagnant water and infusion. 



