HAEMOSPORIDIA 



503 



pyriform bodies with a compact nucleus and vacuolated cytoplasm; 

 the division is peculiar in that it appears as a budding process at the 

 beginning. We owe Dennis (1932) for our knowledge of the develop- 

 ment of the organism. 



Fig. 235. The life-cycle of Babesia bigemina (Dennis), a-f, division in 

 erythrocytes of cattle; g, h, gametocytes; i, isogametes; j, fertilization; 

 k, zygote; 1, ookinete penetrating through the gut wall; m, ookinete in 

 host egg; n-p, sporoblast-formation; q, sporokinetes in a large em- 

 bryonic cell; r, sporozoites in salivary gland. 



Sexual reproduction followed by sporozoite formation occurs in 

 the tick, Boophilus (Margaropus) annulatus; when a tick takes in 



