TRICERCOMONAS 



349 



Type Species. — The type and only species is Tricercomonas hominis 

 Wenyon and O'Connor, 191 6. 



Tricercomonas hominis Wenyon and O'Connor, 1916. 



Definition.- — ^Tricercomonas of small size and active movements, 

 with spherical or ovoid body distinctly flattened on one side and 

 with the posterior end drawn out and terminating in a fiagellum, 

 which can be traced forv/ards along the flattened side to the anterior 

 end of the body, where three anterior long flagella take origin. 

 Habitat, the intestine of man in Egypt. 



Morphology.- — In addition to the characters given above, the body, 

 which measured 4-8 microns in length, is seen to be somewhat 

 grooved along the course of the posterior flagellum. No definite 

 cytostome could be seen. The cytoplasm contains bacilli and cocci, 

 a nucleus with a central karyosome, and a nuclear membrane, which 

 is drawn out into a cone-like elevation, from the summit of which 

 the flagella take their origin. 



Life-History. — ^As forms with two nuclei have been seen, it is 

 presumed that binary division may take place. The cysts are oval, 

 6-8 microns in length and about half this breadth, containing one 

 to four nuclei of the same type as the flagellate. 



Pathogenicity." — It is believed to be non-pathogenic. 



Fig. 76. — Tnce^comowas m^es^iwa/*s Wenyon AND O'Connor, 1915- 



Two flagellate forms (compare side view with Fig. 71) and one cyst. 



(After Wenyon and O'Connor, from the publications of the Wellcome Bureau 

 of Scientific Research.) 



Genus Chilomastix Alexeieff, 191 1. 



Synonyms. — (i) Cercomonas'Dd.Yd.me, 1880, fro parte necY)\x]d.r&m, 

 1841; (2) Trichomonas Roos, 1893, nec Donne, 1837; (3) Monocerco- 

 wont?s Epstein, 1893, nec Grassi,i879; (4) Macros^ow^t Alexeieff, 1909, 

 nec Latreille, 1825; (5) Fanapepea Prowazek, 1911; (6) Tetramitus 

 Brumpt, 1912, nec Perty, 1852; (7) Difdmus Gabel, 1914; (8) Cyatho- 

 mastix Prowazek and Werner, 1914. 



Definition.— Tetramitidinae with large cytostome, three anterior 

 flagella, but no free trailing flagellum. 



Type ^i^QQiQS,— Chilomastix caulleryi Alexeieff, 1909. Synonym : 

 Macrostoma caulleryi found in the intestine of tadpoles. 



Other Species. — C. mesnili Wenyon, 1910; C. mo/^/Z^s Alexeieff, 

 1912; C. hittencourti da Fonseca, 1915; C. caprce da Fonseca, 1915; 

 C. cuniculi da Fonseca, 1915. 



