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. 11.—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. 16.—Early stage in development of P. canis in the gut of the tick 
Fig. 17.—Later stage—large bodies with achromatic line. 
Fig. 18.—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. 
