ANIMAL PARA SI TES S I 



elements are known as microgametocytes, those producing the 

 female gametes are designated macrogametoeytes. 



Microgametocytes. — The microgametocytes present a clear, 

 finely vacuolate protoplasm and reach a much greater size than 

 either schizonts or macrogametoeytes. From each there arises 

 a great number of microgametes analogous -to the spermatozoa 

 of the higher animals. A voluminous mass of residual proto- 

 plasm remains unchanged. 



Macrogametoeytes. — The female gametocytes possess a coarsely 

 granular, dense protoplasm, rich in nutrient substances. In 

 sections the granules, arranged around the periphery, are so large 

 as to resemble nuclei. The true nucleus is, however, clearly 

 evident as a large central body. The young macrogametoeytes 

 are spherical, but they become oval as they mature. They 

 undergo a process of maturation, after which they are known as 

 macrogametes. 



Oocysts. — The mature macrogamete is fertilized by a micro- 

 gamete and through the fusion of their nuclei, the oocyst is 

 formed, ready to continue its development when it passes from 

 the host. 



References 



Andrews, J. M., 1926. Coccidiosis in mammals. Am. Jour. Hyg., 6 (6): 

 784-798. 



Bruce, E. A., 1920. Bovine coccidiosis in British Columbia. Jour. Am. 

 Vet. Med. Assoc, 68 (1): 638-662. 



Johnson, W. T., 1924. Eimeria avium and the diagnosis of avian cocci- 

 diosis. Poultry Set., 3 (2) : 41-57. 



Johnson, W. T., 1928. Coccidiosis of the chicken. Oregon Agr. Exp. Sla., 

 Bull. 238: 1-16. 



Perard, Ch., 1924-25. Recherches sur les coccidies c-t les coccidioses du 

 lapin. Ann. insl. Pasteur., 38: 953-976; 39: 505-542. 



Reich, F., 1912. Das Kaninchencoccid Eimeria stiedoe. Arch. Prolistenk., 

 28 : 1-42. 



