THE PATHOGENIC HEMOSPORIDIA 



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Hepatozoon perniciosum, Miller, a hemosporidian parasite of the rat. (After Miller.) 

 a to d, de^'elopment of the schizont in the liver cells of the rat; e, free parasites in the blood; 

 /, encysted parasites in lymphocytes; g to k, stages in conjugation of isogametes; I, m, n, 

 growth of the ookinet into sporont; o, sporocyst derived from the ookinet, with sporoblast 

 buds covering the surface; p, section of same; q, older sporoblast with sporozoites; r, a 

 single sporozoite. Stages g to r are formed in the tissues of the intermediate host, a mite 

 Lelaps echidninus. 



