— 278 - 
I hâve now shewn that the jarkal (Canis aiirciis) is naturally 
infected vvith a species of piroplasm whicli is transmissable by 
subcLitaneous inoculation to l)azaar dog'S. As far as T am aware 
this parasite has not been previoiisly recorded, and I therefore 
propose naming it Piroplasma gibsoni in honoiir of D'' F. Mait- 
LAxn Gibsox who first saw the parasite. 1 hâve since foiind Piro¬ 
plasma gibsoni in a bazaar dog No. 25, and in four ont of five 
jackals I hâve had the opportunity of examining it. The parasite 
mav be shortly described as follows : 
In films of peripheral blood stained by Romanowsky’s stain the rriajority 
of the parasites are seen as small rings, either with one large chromatin 
mass or with two, the second being much smaller and appearing as a dark 
almost black dot (fig. i, 3, 4, et 5). The smaller chromatin mass is fre- 
quently joined to the larger by a pink thread probably of the nature of 
chromatin (fig. 3). Some of these rings are exceedingly small measuring 
about I P in diameter (fig. 4). In many of the parasites the large chromatin 
mass is scen to be divided into two, which may or may not be joined by a 
thin chromatic filament (fig .4). When the parasites are very mimerons, as 
in the case of dog No. 7, two or more are commonly seen in the same red 
cell, and there is a great disparity in their sizes (fig. i et 4). In the blood of 
dog No. 7 taken two days before its death many of the red cells contained 
from sixteen to thirty parasites (fig. 6), these red cells stained dark blue with 
Romanowsl<y’s stain. Figure 2 shews an oval parasite with a long amoeb- 
oid process, the chromatic mass is lying stretched out at one end, parasites 
exhibiting these amoeboid process were commonly seen stretching across 
the red cells. The mc-lhod of division appears to be a process of binarv fission, 
the two chromatin masses separate and then the cell splits in its longest 
diameter, as a resuit thin rod-like forms were commonly encountered (fig. 6). 
This piroplasm then differs markedly in structure from Piro¬ 
plasma canis; it is much smaller and is chiefly seen as a délicate 
ring of blue staining protoplasm ; the pairs of large pvriforni 
bodies so characteristic of P. canis bave never been seen. 
