The Mastigophora 189 



Fig. 4. 48. A. Trichomonas limacis Dujardin, showing pclta, beaded 

 and bifurcated parabasal body, axostyle, and nucleus; x2415 (after Koz- 

 loff). B. Tritrichomouas augusta Alexeieff; axostyle, nucleus, parabasal 

 body, heavy costa; xl680 approx. (after Samuels). C. Tritrichomouas foetus, 

 parabasal body not shown; x2795 (after Wenrich and Emmerson). D. Tri- 

 chomonas gallinae (Rivolta) Stabler, x3400 (after S.). E. Pseudotrypano- 

 soma gigantea Grassi; heavy costa, long parabasal body parallel to axostyle, 

 long undulating membrane; x575 (after Kirby). F. Coronympha clevelajidi 

 Kirby, showing anterior circle of karyomastigonts, axostyles extending pos- 

 teriorly; xl400 (after K.). 



in some species. The group is widely distributed in vertebrates and cer- 

 tain invertebrates. Several parasites of man are discussed in Chapter XI. 

 TricJwmonas gallinae is a pathogen in the anterior digestive tract of 

 pigeons (261, 262); Tritrichonionas foetus is a parasite of the genital 

 tract in cattle (196, 281); Trichomonas gallinarum occurs in the ceca of 

 chickens and turkeys and the liver of turkeys. Like Histomonas rnele- 



