MORPHOLOGY AND CLASSIFICATION 



153 



criteria presented. The genera of particular interest from the 

 pathological standpoint are Trypanosoma, Leishmania,, Tricho- 

 monas and Lamblia. The members of the Trypanosoma are 



FIG. 74. Leishmania 

 donovani. Various forms 

 of the organism in artifi- 

 cial culture. (From Doflein 

 after Chatterjce.} 



FIG. 75. Trichomonas hominis. 

 (From Doflein after Grassi.} 



characterized by an approximately crescent-shaped body, 10 to 

 40ft in length, flexible and provided with a flagellum which origi- 



FIG. 76. Lamblia inttstinalis. A, Ventral aspect. B, Lateral aspect. C. At- 

 tached to an epithelial cell. (From Doflein after Grassi and Schewiakoff.) 



nates in the endoplasm near one end and passes along the border 

 of the body and finally projects as a free whip at the other end 

 of the cell. As it passes along the border of the cell it is enclosed 



