64 
Rossiella rossi 
nucleus is large ; when at rest it is rounded. The parasite nnultiplies 
by direct division of the nucleus into two followed by division of the 
protoplasm, thus giving rise to two daughter individuals which, if 
sufficiently matured, may repeat the process of division within the same 
corpuscle. The chromatin structures in resting and dividing forms of 
Rossiella differ completely from those seen in Piroplasma. The 
protoplasm tends to take up the blue stain uniformly when the parasites 
are stained by modifications of the Romanowsky method, although 
some parasites show blue staining protoplasm condensed peripherally. 
Judging from stained specimens, the parasites are but slightly amoe¬ 
boid. They may assume an irregular or elongated shape occasionally. 
In only five out of over 700 parasites which I have examined did these 
elongated forms possess a piriform shape which, I have no doubt, was 
transitory. 
It will be a matter of considerable interest to study this parasite in 
vivo. Dr Montgomery has kindly sent me a gorged female Haema- 
physalis leachi, of which three specimens were found upon the jackal 
whose blood harboured these pax’asites. I hope that the ticks are 
infected and that it will be possible to carry out further studies upon 
the parasites. At present we do not know, but can only suspect, that 
the parasite is conveyed by ticks. 
REFERENCES. 
Nuttall, G. H. F. (iv. 1910). On Haematozoa occurring in wild animals in Afi'ica. 
Piroplasma rossi n. sp. and Haemogregarina cards adibsti n. sp. found in the 
Jackal, etc. Parasitology, in. 108-112. 
Patton, W. S. (iv. 1910). Preliminary report on a new piroplasm {Piroplasma 
gihsoni n. sp.) found in the blood of the hounds of the Madras hunt and 
subsequently discovered in the blood of the jackal, Canis aureus. Bull. Soc. 
Pathol. ExotiqibC, in. 274-280. 
