102 



The parasite itself is characterized by the large size of* 

 the halter-forms, which frequently occupy four-fifths or five- 

 sixths of the available space in the red cells. It is also re- 

 markable for the large size of the melanin granules in many 

 specimens; these, though sometimes numerous and small, are 

 at others remarkably large, and then appear sometimes as 

 definite rods, sometimes as rounded masses. 



The following is a description of ten consecutive para- 

 sites, afterwards arranged in order: — 



(1). Pale, immature form, occupying only one end and 

 side of the red cell. Melanin as small granules 

 towards each end. 



(2). Very pale-coloured. Occupies whole' of red cell, ex- 

 cept part of one side a little more extensive than 

 length of nucleus. Host's nucleus a little dis- 

 placed. Groups of large melanin granules at one 

 end ; six scattered fairly large granules at other ; 

 two near middle. 



(3). Almost colourless. Extent and displacement of 

 nucleus as in (2). Finely peppered throughout 

 with rounded small melanin granules, often col- 

 lected in little groups. 



(4). Almost colourless. Extent and displacement of 

 nucleus as in (2) and (3). Melanin as fairly large 

 granules grouped at each end. 



(5). Very pale. A little less extensive than (2), etc. 

 Host's nucleus a little displaced. Medium-sized, 

 rod-shaped granules, chiefly towards both ends and 

 outer edge. 



(6). Very pale. Extent and displacement as in (5). 

 Pigment large, some masses very large ; towards 

 each end. 



(7). Very pale. Parasite occupies whole of one end from 

 level of nucleus, one side, and the longitudinal 

 half of the other end. Nucleus not displaced. 

 Pigment at both ends ; very large at one end (9 

 masses), smaller at other (4). 



(8). Pale-blue protoplasm. Occupies one side and part 

 of ends. Very coarse large grains of pigment; two 

 masses of several grains at one end, one in the 

 middle, several scattered masses at other end. 



(9). Pale-blue. Occupies nearly two-thirds of red cell. 

 Host's nucleus a little displaced. Melanin as very 

 large rod-shaped masses scattered generally. 



(10.) Pale-blue. Occupies quite two-thirds of red cell. 

 Nucleus a little displaced. Pigment as small 

 masses in groups, chiefly at one end and middle,-. 

 with small group at other end. 



