PROTOZOA AND DISEASE 



small free forms similar to those seen in the dog's red blood-cor- 

 puscles, and with them others of larger size and more distinct nuclei. 

 Some of these had blunt projections from the surface (Fig. 10 ; 2 and 3). 

 2. In the gut, oviducts and ova, and in the salivary glands of 





FIG. 10. DEVELOPMENTAL FORMS OF PIROPLASMA CANIS. (After 

 Christophers ; selected from the British Medical Journal.} 



I, Intraglobular form ; 2 to 6, stages of growth and development met with in the gut 

 of the tick ; 5 and 6, also occur in the tissues of the tick ; 7, club-shaped bodies 

 from the tissues of nymphs of the second generation ; 8, ' spiroblasts ' forms 

 found in great numbers in the salivary glands of nymphs ; 8 1 , shows the 

 chromatin is arranged in a dense point and filamentous streamers ; 9, forms 

 from unhatched adult, the chromatin subdivided ; 10, group of pirosoma-like 

 bodies resulting from subdivision of 'sporoblast' ; n, cell packed with minute 

 piroplasmata (of the host-cell only the nucleus is shown) ; 12, coccidiiim-like 

 intracellular form ; 13, sporulation of a form similar to 12. (All x 2,000 

 diameters except u, which is x 300.) 



nymphs, were large club-shaped bodies, having active creeping and 

 side-to-side movements, and many of them being provided with an 

 anterior organ recalling the ' epimerit ' of the higher gregarines 

 (Fig. 10 ; 5 and 6}. 



