DESCRIPTION OF PLATE XI. 



PHASES OF THE BENIGN TERTIAN PARASITE. 



FIG. i. Several young ring-shaped parasites (amcebulae) con- 

 tained in the red corpuscles, one of which is granular. 



FIG. 2. A larger amcebula containing pigment granules. 



FIG. 3. Two older amcebulse. 



FIG. 4. A still older amcebula, just before- schizogony. 



FIG. 5. Schizont, which has just divided into eighteen 

 merozoites. 



FIG. 6. Free merozoites. 



