148 



SPOEOZOA. 



Fig. 67. — Hepatozoon canis (James). A, parasite in a leucocyte of the 

 dog ; B, free vermicule in the blood of the dog ; C, D, 

 schizogony in the bone-marrow of the dog ; E, gametocytes 

 lying side by side ; F, G, formation of the microgametes ; 

 H, zygote showing a number of nuclei ; /, section of oocyst 

 in which sporoblast formation is taking place ; J, section of 

 fully developed oocyst in which the sporocysts, each con- 

 taining about sixteen sporozoites, have formed. A-G in the 

 dog ; H-J in the tissues of the tick. (A-I, after Christophers ; 

 J, after Wenyon.) 



