PLASMODIUM. 285 



any malarial infection, which suggests that this species of 

 monkey rarely, if ever, suffers from natural infection with 

 malaria in this region. 



Eaiowles and Das-Gupta (1932) were also successful in 

 infecting a man with a Plasmodium from the lower monkeys. 



Habitat. — In natural infections of blood of Silenus irus 

 (Cuv.) believed to be imported from Singapore, and experi- 

 mental infections of S. rhesus (Audeb.) : Bengal, Calcutta. 



237. Plasmodium kochi Laveran. (Fig. 135.) 



Hsemamosba kochi, Laveran, 1899, p. 124. 

 Plasmodium kochi, Leger & Boiiilliez, 1914, pp. 954—85. 

 'fPlasmodium kochi, Castellani & Chalmers, 1913, pp. 387—8 ; 



1919, p. 515. 

 Plasmodium kochi, Muhlens, 1919, pp. 1608-11, fig. 31. 

 jPlasmodimn kochi, Donovan, 1920, p. 719. 



Plasmodium kochi, Wenyon, 1926, p. 971, pi. xv, figs. 22—8 ; 

 Knowles, 1928, p. 439, fig. 102, 11-12 ; Reichenow, 1929, 

 p. 1006, fig. 991. 

 ^Plasmodium, kochi, Sinton & Mulligan, 1933, p. 424. 

 Plasm,odium, kochi, Coatney & Roudabush, 1936, p. 339. 



Resembles P. vivax. Ring-forms large. The young rings 

 occupy a smaller proportion of the corpuscle than in P. vivax, 

 but as growth proceeds resemblance becomes marked. The 

 infected red blood -corpuscles become enlarged, parasite 

 becomes irregular in shape, pigment granules are of a hght 

 brown colour, and sometimes Schiiffner's dots may be found 



Fig. 135. — Plasm,odium, kochi (Laveran). A, ring-form ; B, schizont. 

 (From Reichenow, after Gonda and Berenberg-Gossler.) 



to occur. Schizogony is completed in forty-eight hours. 

 Schizont produces eight to fourteen merozoites, and bears 

 a striking resemblance to that of P. vivax. Gametocytes 

 are large round bodies which can be distinguished as male 

 and female, as in P. vivax. 



Remarks. — The species is a common parasite of monkeys 

 in tropical Africa, but shows little sign of pathogenicity in 

 natural infections or in inoculated animals. Gonder and 

 Rodenwaldt (1910) noted, however, that if splenectomy is 

 previously performed infections are much more severe, 

 temperature rises, and the parasites continue in the blood 

 for many months. They were unable to inoculate the parasite 



