612 PROTOZOOLOGY 



granules; Schuffner's dots abundant. Schizogonic stages: 6-12 mero- 

 zoites. Gametocytes: Resemble closely those of P. malariae; host cells 

 with Schuffner's dots and slightly enlarged. 



This organism appears to be confined to Africa and Asia (Philip- 

 pine Islands and India). Several malariologists doubt the validity of 

 the species. 



The malarial parasites are ordinarily studied in stained blood 

 films (p. 899). Table 11 will serve for differential diagnosis of the 

 three common species. 



'r% 



e f g h 



Fig. 262. Plasmodium ovale, X1535 (Original), a, ring-form; b, c, 

 growing schizonts; d-f, schizogonic stages; g, macrogametocyte; h. micro- 

 gametocyte. 



Several species of Plasmodium have been observed in primates and 

 monkeys, some of which resemble strikingly the human species. 

 Here a few species will be mentioned. Other species (Aberle, 1945). 



P. kochi (Laveran) (Fig. 263, a-f). In the monkeys belonging to 

 the genera: Callicebus, Cercocebus, Cercopithecus, Erythrocebus, 

 and Papio; schizogony in 48 hours; organism resembles P. vivax; in- 

 fected erythrocytes become enlarged and sometimes stippling like 

 Schuffner's dots occurs; eight to 14 merozoites; gametocytes large 

 and spheroid. 



P. brasilianum Gonder and Berenberg-Gossler (Fig. 263, g-l). In 

 New World monkeys belonging to the genera: Alouatta, Ateles, 

 Cacajao and Cebus; schizogony in 72 hours; it resembles P. ma- 

 lariae; no enlargement of infected erythrocytes; band-form schi- 

 zonts; number of merozoites vary according to the difference in hosts, 

 averaging eight to 10; gametocytes rounded, comparatively small in 

 number (Taliaferro and Taliaferro, 1934). Haematology (Taliaferro 

 and Kliiver, 1940). 



P. cynomolgi Mayer (Fig. 263, m-r). In Macaca irus (Macacus 



