C. A. Ho A RE 
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EXPLANATION OF PLATE XVIII. 
All the preparations were drawn by means of Leitz’s camera lucida, at a magnification of 
about 1500 diameters (Leitz, oc. 4, Horn. imm. T V )* 
Figs. 1 to 3: from Bitis gabonica. 
Fig. 1. Small (young) form of haemogregarine. 
Figs. 2, 3. Trophozoites. 
Figs. 4 to 7: from a tree snake (No. 5). 
Fig. 4. Normal erythrocyte. 
Figs. 5, 6, 7. Haemogregarines. In Fig. 5 the parasite is closely adjacent to the vacuolized 
nucleus of the blood corpuscle. In Fig. 7 the nucleus of the latter is hypertrophied. 
Figs. 8 to 18: from Bufo No. 9. 
Fig. 8. Normal erythrocyte. 
Figs. 9, 10, 11. Merozoites: free, entering and leaving the erythrocytes. 
Figs. 12, 13. Trophozoites. 
Fig. 14. Trophozoite, one limb of which is being reduced. Granules of volutin visible. 
Figs. 15, 16. Full grown trophozoite (schizont). Volutin visible. Dark hood at one of the 
poles visible. In Fig. 16 the nucleus of the erythrocyte has broken up into two parts. 
Figs. 17, 18. Stages of maturation of the schizont. In Fig. 17 the parasite is seen to be leaving 
the corpuscle in which the abandoned capsule is visible. 
Figs. 19 to 25: from Bufo No. 6. 
Fig. 19. Merozoite. 
Figs. 20, 21. Same: growth and bending. 
Fig. 22. Mature form (trophozoite). 
Fig. 23. Same: fusion of the two limbs. 
Figs. 24, 25. Schizonts. 
Figs. 26, 27. Bodies of undetermined origin. 
