PHYLUM PROTOZOA 



S5 



In some of the Coocidiiclea this life cycle is modified in various ways, as, for 

 example, by the omission of schizogony— the trophozoites in sueli a case 

 developing directly into gametocytes. 



Flo. 65. — Life-History of Coccldium achubergi, a, penetration of epitlielium cell of host by 

 sporozoite ; b-c, stngcs of multiple fission (schizogony) ; tZ, gametocylie ; e, f, formation of 

 megagamete (ovum) ; g, fertilisation ; h, j, formation of microgametes (sperms) ; k, develop- 

 ment of fertilised ovum into four spores ; I, formation of two sporozoites (falciform young) in 

 each spore. (From Calkins, after Schaudinn.) 



Order 3. — H/^iMospoRiDEA. 



These are Sporozoa which in the trophozoite condition live as parasites in 

 the interior of the coloured blood-corpuscles of all classes of Vertebrates, but 

 are occasionally found in other cells. In Man and in some other mammals and 



