5i8 TELOSPORIDIA 



Differential Characters of the Malarial Parasites. 



Chavacte-Y. 



Schizogony 



Young tropho- 

 . zoite 



Haemozoin 



Schizont 

 Merozoites 



Gametocytes . . 

 Erythrocytes . . 



P. malavicB, 



Completion in 

 s eve nty-t wo 

 hours. 



Young t ropho- 

 zoite, smaller 

 than P. vivax, 

 larger than L. 

 malavice: move- ■ 

 ments rather 

 slow; pseudo- 

 podia not 

 marked or long. 



Granules coarse, 

 sluggish ; peri- 

 pher ally ar- 

 ranged; dark 

 brown. 



Smaller than red 

 corpuscle. 



Six to twelve, 

 regularly ar- 

 ranged in a 

 rosette. 

 Resemble sporonts, 

 but larger. 



Almost normal. 



P. vivax. 



Completion in 

 f o rt y -ei ght 

 hours. 



Young tropho- 

 zoite, large; 

 very activel^r 

 motile; long 

 pseudopodia. 



Granules fine; 

 m ovement 

 marked. 



Larger than red 

 corpuscle. 



Fifteen to twenty, 

 regularly ar- 

 ranged. 



Resemble sporonts, 



but larger. 

 Pale and swollen. 



L. malavice. 



Completion in 

 forty-eight 

 hours or less. 



Young tropho- 

 zoite, small; 

 actively motile. 



Granules fine and 

 scanty; often 

 motionless. 



Much smaller 

 than red cor- 

 puscle. 



Eight to fifteen, 

 arranged irre- 

 gularly. 



Crescentic in 



shape. 

 May be small and 



dark. 



Schizogony takes from thirty-six to forty-eight hours to be 

 completed. 



The gametocytes are characterized by being crescent-shaped and 

 large, with the remains of the red cell stretched round them. The 

 haemoglobin of the cell is often seen lying in juxtaposition to the 

 parasite, while the remaining portion of the corpuscle is almost 

 colourless. 



The macrogametocyte is characterized by its long thin shape. 



Family H^moproteid^ Sambon 1906. 



Definition. — Hsemosporidia with haemozoin, but with ookinete which does 

 not encyst. 



Genus Haemoproteus Kruse, 1890. 



Synonyms. — Haltevidium Labbe, 1894; Laverania Laveran, 1899; Trypano- 

 soma Schaudinn, 1904; Trypanomovpha Leger, 1906. 



Historical. — These parasites were first described by Grassi and Feletti in 

 the blood of birds in 1890 as Laverania, a term altered by Labbe in 1894 "to 

 Halteridium danilewskyi. In 1904 came Schaudinn's paper showing that 

 they were stages in the life-history of trypanosomes, which has been sup- 

 ported by the work of the Sergents, and has been severely criticized by Novy, 

 McNeal, Ross, and Thiroux, who believe that Schaudinn made a mistake, and 

 that the flagellates and intracorpuscular parasites are quite distinct. In 1908 



