MORPHOLOGY AND CLASSIFICATION 



1 59 



upon, not because of any lack of morphological differences upon 

 which to base a classification, but largely on account of difficulty 

 in estimating the relative importance and meaning of the many 



A^ S/ C, E 



Fig. 76. — Leishmania 

 donovani. Various forms 

 of the organism in artificial 

 culture. (From Doflein after 

 Chaiterjee.) 



Fig. 77. — Trichomonas hominis. 

 {From Doflein after Grassi.) 



criteria presented. The genera of particular interest from the 

 pathological standpoint are Trypanosoma, Leishmania, Tricho- 



FiG. 78. — Lamblia intestinalis. A, Ventral aspect. B, Lateral aspect. C, At- 

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



monas and Lamblia. The members of the Trypanosomata are 

 characterized by an approximately crescent-shaped body, 10 to 

 40/1 in length, flexible and provided with a flagellum which origi- 



