DESCRIPTIONS OF NEW HAEMOPROTOZOA FROM BIRDS IN N.S.W. 91 



to the centre. In half grown forms, a small melanin speck 

 could in some cases be detected. In the young forms, no 

 pigment was noticed. 



An interesting feature was that, though in some of the 

 cells containing general parasites, all were of about the 

 same size, in others one or more were distinctly larger. 

 A further stage of this was seen, when in one red cell a 

 large halteridium form was met with, with a quite small, 

 somewhat longitudinally flattened early form between it and 

 the nucleus, and on the other side of the nucleus a small 

 irregularly rounded amoeboid form (fig. 11). This red 

 corpuscle was not distorted or enlarged, the only doubtful 

 pressure effect noticeable being the narrowing of the form 

 lying between the large parasite and the nucleus. Had 

 the nucleus been displaced at all, this would have been 

 manifested in the parasite on its further side. It is hard 

 to say what would happen if all the forms in the multiple 

 infected cells were of the same age and attempted to 

 mature at once. 



When first examining this species, the irregular amoeboid- 

 like outline of the early forms and their abundance and the 

 multiple injections of single host cells suggested that we 

 were dealing with a species of Plasmodium. This was 

 supported by the frequency with which the young parasite 

 occupied other positions than one directly lateral to the 

 host nucleus. On further search, however, halter-like 

 forms were found, though these were not so large, and had 

 not the definite sharp outline of ordinary adult Halteridia. 

 That we are justified, however, in considering this parasite 

 as a Halteridium, is evidenced, we believe, in the fact that 

 forms like those presented in this case were found by us in 

 other definite Halteridia. In our H. philemon, for instance, 

 early forms of the parasite were seen occasionally with 

 outlines like those of H. meliornis, and some of these 



