50G NOTES ON SOME PARASITIC PROTOZOA, 



(3) Fairly well-stained protoplasm. No host-nucleus. Pigment 

 as two masses and three granules. 



(4) Fairly well-stained protoplasm. Parasite free. Melanin 

 as a number of small masses. 



(5) Well-stained protoplasm. Host-nucleus displaced. Melanin 

 as four or five small granules, 



(6) Well-stained protoplasm. No host-nucleus. Melanin as a 

 group of granules. 



(7) Well-stained protoplasm. Host-nucleus displaced. Melanin 

 as five or six small masses. 



(8) Well-stained protoplasm. Host-nucleus displaced. Melanin 

 as a large mass to one side. 



(9) Well-stained protoplasm. Host-nucleus displaced. Melanin 

 as two irregular masses. 



(10) Well-stained protoplasm. Host-nucleus as a mass and 

 smaller granules. 



One of us (T.H.J.) (8) has previously recorded this parasite as 

 Plasmodium prcecox(l), but a fuller examination has emphasised 

 in our minds the difierences then noted between this parasite and 

 the descriptions of the true P. prcecox available to us. For instance, 

 Minchin(9) points out the bean-shaped character of the gameto- 

 cytes of P. prcecox ; those of our parasite are practically spherical. 

 That our bodies were for the most part full-grown is evidenced, 

 we think, by red cells being frequently found in which the 

 nucleus had been turned out, and the parasite occupying nearly 

 the whole of the corpuscle. Again, it can hardly be that all the 

 large spherical forms represented schizonts, all exactly at the 

 same stage and ready to form merozoites, but none showing 

 evidence of doing so. 



A reference to tlie description of Plasmodium majo7'is Laveran, 

 in Liihe's(7) article in Mense's "HandbuchderTropenkrankheiten,'' 

 shows that the gametocytes of our organisms are only about half 

 the size of the gametocytes of that parasite (5 to 6-5/x as against 

 11 to 12/x). In the same work, F. Vaughani (Novy and McNeal) 

 is stated, from its small size, not to displace the nucleus materially, 

 which our parasite does. 



