150 E. A. MINCHIN AND 11. .M. WOODCOCK. 



inferred that its structure conforms to that of H. rovig- 

 nensis and to what we consider is the general plan. At 

 other times nothing but a " splotch" of colour, fiom which it 

 is impossible to ascertain anything, is depicted. 



In conclusion we have only to point out that it seems clear 

 that the nucleus of a haemogi-egarine is of a very different 

 type from that of a trypanosome. The former is chaiacterised 

 by its chromatic reticulum, with chromatin grains or masses 

 more or less generally distributed upon it. In the latter the 

 greater part or nearly all of the chromatin is, as it were, con- 

 densed around a plastinoid basis, the whole forming the con- 

 spicuous karyosome ; and in the centre of this plastinoid area 

 is a definite granule, the intra-nuclear centrosome. 



So far, therefore, as the haemogregarines at least are 

 concerned, we are totally unable to agree with Hartmann (4c), 

 who proposes to remove the Hfemosporidia entirely from the 

 Sporozoa, and place them with the trypanosomes and their 

 allies among the Flagellata as a group named Binucleata. 



Postscript. 



We had not intended to refer in this paper to the nucleus 

 of Halteridium. Quite by chance, however, we have 

 noticed a couple of sentences at the end of Berliner's account 

 of the cytology of certain Flagellates (1), which relate to 

 the structure of Halteridium noctuas and Leucocyto- 

 zoon ziemanni, as shown by iron-haeinatoxylin. There is 

 no reference to this point in the title or list of contents, and 

 we have only had our attention drawn to Berliner's figures 

 since our present paper was completed. We refer to 

 Berliner's note because we have ourselves obtained similar 

 indications of the nuclear structure of these parasites during 

 our work at Rovigno. We will only point out here that from 

 Berliner's published figures, and equally from our own pi-e- 

 parations, there can be no doubt that the nuclear structure of 

 Halteridium is quite different from that of a htemo- 

 gi'egarine, and^ on the other hand, remarkably like that of the 



