On Flagellated Protozoa, dc. By Edgar M. Croohshanh. 925 



With careful illumination tbe body is found to be distinctly- 

 granular, with one or more highly-refractive spherules. Wben 

 the rapid movement is arrested the undulating membrane is dis- 

 tinctly visible. The best opportunity occurs for seeing this when 



Fig. 197. 



A monad in rat's blood. The organism is represented at partial rest with its 

 posterior filament impinging on a corpuscle, and showing the undulating loDgi- 

 tudinal membrane, the long flagellum, and the refractive spherules in the granular 

 protoplasm ( X 3000). 



the organism comes to partial rest with its stiff filament against a 

 corpuscle, as if to obtain a point oVappui, while lashing its flagel- 

 lum in all directions (fig. 198, b). At other times, when the parasite 



Fig. 198. 



Monads in rat's blood x 1200. a, A monad threading its way among tbe blood- 

 corpuscles ; b, another with pendulum movement attached to a corpuscle ; 

 c, angular forms ; d, encysted forms ; e and /, the same seen edgeways. 



has impinged with its posterior extremity against a corpuscle, or 

 the stiff filament is apparently entangled in debris, the movements 

 of the organism give one the idea of its endeavouring to set itself 

 free, but I have not been able to persuade myself that they 

 " attack and disintegrate " the red blood-corpuscles. 



In the active state the thicker portion, or body, appears to 

 twist and bend from side to side with great activity. The organism 



