C. Basile 
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EXPLANATION OF PLATES XXI AND XXII. 
PLATE XXI. 
fa) Leishmania in the vertebrate host: 
Figs. 1-4. Non-flagellate stage. 
Figs. 5, 6. Showing homomorphous division. 
Fig. 7. Showing heteromorphous division. 
(b) Leishmania in cultures: 
Fig. 8. Young non-flagellate parasite. 
Fig. 9. Flagellate form derived from non-flagellate parasites 
Figs. 13, 14. Parasites commencing equal longitudinal division. 
Fig. 15. Form derived from flagellate parasites by longitudinal division. 
(c) Leishmania in Ctenocephalus canis: 
Figs. 16-19. Pre-flagellate stages. 
Figs. 20-22. Pre-flagellate stages showing equal longitudinal division. 
Figs. 24-29. Flagellate stage. 
Fig. 28. Parasite commencing equal longitudinal division. 
Fig. 30. Parasite approaching the post-flagellate stage. 
Figs. 31-34. Post-flagellate stage. 
(d) Herpetomonas in Pidex irritans (a specimen kindly sent me by Dr Wenyon): 
Figs. 35-39. Different stages of flagellate parasites in the flea’s intestine. 
Fig. 40. Parasite in post-flagellate stage. 
PLATE XXII. 
Figs. 1-7. Herpetomonas ctenophthalmi (after Mackinnon). 
Figs. 8-11. Crithidia hystricopsillae (after Mackinnon). 
Figs. 12-17. Crithidia pulicis (after Porter). 
