246 



THE PATHOGENIC FLAGELLATES 



free flagellum at the posterior end (Fig. 98). Such forms may be 

 readily conceived as coming from bodo-like types in which the pos- 

 terior or trailer flagellum becomes attached to the cell, while the 

 trypanosome type may arise from such forms by the suppression of the 



Fig. 98 



Trypanoplasma borreli. (After Keysselitz.) A, B, old, developmental stages; C, a so-called 

 "male" form; D,E, so-calted "female" forms; G,H, the "copula." 



