Plasmodium cephalophi. 



47 



the other antelope was caught on the plateau and had been in captivity and 

 not in the vicinity of other wild game for at least six months before it was 

 brought to Kasu. As it developed an acute attack a few weeks after it had 

 been placed in the same enclosure with the infected duiker, it would appear 

 that in its case the infection was contracted locally. 



The two antelope were first found to be infected in the height of the dry 

 season (October), and although a systematic search was made for adult or 

 larval mosquitoes, none could be trapped or found in or near the enclosure. 



In the same compound there were also another young duiker, a young 

 reedbuck, and a young hartebeeste, and although the blood of these animals 

 was examined frequently, no malarial parasites could be found. 



If this parasite should prove to be a new one, the name of Plasmodium 

 cephalophi is proposed for it. 



DESCRIPTION OF PLATES. 

 Plate 4. 



Fig. 1. — Schizont, ruptured in making the film. The merozoites are drawn along in the 

 direction of the sjn'eading of the blood. The residual mass and free pigment 

 are also shown. 



Figs. 2 and 3. — Merozoites entering red cell. Note the granules in fig. 2 scattered 

 throughout the jDrotoplasm ; in fig. 3 there are two granules, one large and 

 one small. 



Figs. 4-15. — Trophozoites, showing marked enlargement and paleness of red cells and 



concentration of portion of red cell in vacuole. 

 Figs. 16-18. — Young forms of " rosette " formation. 

 Fig. 19. — Fully developed schizont before cleavage of protoplasm. 



Figs. 20-22. — Schizonts which show commencing cleavage of protoplasm, with a single 



mass of gamboge-coloured pigment. 

 Fig. 23. — Schizont in which the merozoites are completely separated. Some are oval and 



some circular in shape. All show a V-shaped group of granules at the opposite 



pole from the nucleus. 



Stained Giemsa, x 2000. 



Plate 5. 



Figs. 1-5. — Young parasites, with faintly staining protoplasm and without vacuole. 



These were found in the same films as the forms shown in Plate 1, figs. 6-14. 

 Figs. 6-11. — Gametocytes, with faintly staining nucleus and granular protojjlasni. 

 Figs. 12-16. — Forms found in the blood some weeks after acute attack (macrogametocytes). 

 Figs. 17-22. — Some anomalous forms. 



Stained Giemsa, X2000. 



