PLATE III 

 Piroplasma canis 



Fig. 1-5. Stages in the growth and fission of P. canis. 



Fig. 6-7. An alternative method of division after formation of 



elongate form of parasite. 



Fig. 8. Two elongate parasites about to undergo fission. 

 Fig. 9. Group of four parasites in a cell. 

 Fig. 10. Group of sixteen parasites in a cell. 



Fig. II. Clear refractile type of parasite with peripheral chromatin. 

 Fig. 12. Form with flagellum-like amoeboid processes. 

 Fig. 13. Free forms resulting from dissolution of a cell containing 



two large forms. 

 Fig. 14. Free forms resulting from the dissolution of a cell containing 



eight forms. 

 Fig. 15. Bacillary form of Piroplasma (in blood of cattle). P 



parvum. 



Fig. 1 6. Early stage in development of P. canis in the gut of the tick 

 Fig. 17. Later stage large bodies with achromatic line. 

 Fig. 1 8. Early stage in formation of club-shaped body resulting 



from last. 



Fig. 19. Immature club-shaped body. 

 Fig. 20. Immature club-shaped body shewing portion of chromatin 



passing forward to form disk. 

 Fig 21. Fully-developed club-shaped body. 

 Fig. 22. Similar stage to 17, but about to form double bodies. 

 Fig. 23-24. Later stages of 22. 

 Fig. 25. Club-shaped bodies in the tissues undergoing change 



into ' zygote.' 

 Fig. 26. ' Zygote ' embedded in tissue cell of nymph fed on infective 



blood. 



Fig. 27-28. Developing zygotes. 



Fig. 29. Bodies formed by fission of a zygote (sporoblasts ?). 

 Fig. 30. Stage in division of a * sporoblast.' 

 Fig. 31. Division of a 'sporoblast' into sporozoits. 

 Fig. 32. Sporozoits. 



Fig. 33. Sporozoits shewing amoeboid processes. 

 Fig. 34. Cell of embryonic tissue packed with masses of sporozoits. 

 Fig- 35- Two large cells in process of becoming two acini of the 



salivary gland, containing sporozoits. 



