290 



SPOEOZOA. 



241. Plasmodium canis Castellani & Chalmers. (Fig. 139.) 



■fPktsmodium canis, Castellani & Chalmers, 1910; 1919, p. 515, 



figs. 171, 172. 

 Plasmodium canis, Muhlens, 1921, p. 1617 ; Wenyon, 1926, p. 976 ; 

 Knowles, 1928, p. 442 ; Reichenow, 1929, p. 1009 ; Coatney & 

 Roudabush, 1936, p. 338. 



Morphologically similar to P. vivax. Small round merozoite 

 enters the red cell, and grows into a pigmented trophozoite, 

 finally dividing into a number of merozoites. Schiiffner's 

 dots are seen. Female gametocyte has a small rounded 

 nucleus. Male gametocyte has a narrow elongated nucleus. 

 Infected red cells are enlarged. 



B 



Pig. 139. — Plasmodium, canis Castellani & Chalmers. A, young tropho- 

 zoite ; B, full-grown trophozoite ; C, early schizont ; 

 D, mature schizont ; E, female gametocyte ; F, male 

 gametocyte. (After Castellani and Chalmers.) 



Remarks. — Castellani and Chahners (1910) described this 

 parasite from dogs in Colombo. Castellani (1924) again 

 refers to it, and states that he saw several cases of infection 

 in dogs in Colombo. No other observer has seen the organism. 

 Wenyon (1926) obtained blood-films from 500 pariah dogs 

 from Ceylon, but in none of them could the parasite be found. 



Habitat. — Bloodof the dog, Cams /ami7tam Linn. : Ceylon, 

 Colombo. 



242. Plasmodium equi Castellani & Chalmers. 



■fPlasmodium equi, Castellani & Chahners, 1913 ; 1919, p. 516. 

 Plasmodium equi, Wenyon, 1926, p. 976; Reichenow, 1929, p. 1009 ; 

 Coatney & Roudabush, 1936, p. 339. 



Very similar to P. vivax of man. 



Remarhs. — Castellani and Chalmers gave no description, 

 but simply stated that the species closely resembled P. canis. 

 It has not been recorded since by any other observer. 



Habitat. — Blood of the horse, Equus caballus Linn. : Ceylon. 



