432 



PROTOZOOLOGY 



In the gut 

 of the leech, 



* Placobdella 

 catenigera 



Fig. 196. The hfe-cycle of Haemogregarina stepcmoivi, X1200 

 (Reichenow). a, sporozoite; b-i, schizogony; j-k, gametocyte-forma- 

 tion; 1, m, microgametocytes; n, o, macrogametocytes; p, q, associa- 

 tion of gametocytes; r, fertiHzation; s-w, division of the zygote nu- 

 cleus to form eight sporozoites. 



