SPOROZOA 



99 



Fig. 8i. A diagram of the life cycle of Piroplasma. After Dennis, with 

 modifications. 1-5, agamogony in red corpuscles ; 6, gamete ; 7, 8, conjugation 

 in gut of ticks; 9-12, passage of zygote through walls of gut and oviduct into 

 ovum and encystment there; 13, 14, formation of sporoblasts ; 15, migration 

 of sporoblast; 16, sporoblasts, now multinuclear, in cell of rudiment of 

 salivary gland of tick of second generation; 17 (less magnified), acinus of 

 salivary gland containing sporozoites formed by break-up of sporoblasts. 

 al. wall of gut; od. wall of oviduct; ov. ovum. 



