62 
Rossiella rossi 
the liver, kidney and spleen of a jackal cub; three of the latter 
were stained on arrival in Cambridge. Whereas very few parasites 
could be detected in the organ smears, no less than 1'25 ®/o of the 
corpuscles* in the blood-film were found to harbour parasites. We 
may conclude, because of the large number of parasites present in the 
blood-film, that the jackal was suffering from an acute attack of disease 
set up by the parasite. 
The blood-film was carefully examined and six hundred parasitized 
corpuscles were classified in accordance with the types of parasites which 
they contained, the results being as follows ;— 
No. of E.B.C. 
examined 
Percentage 
(roundly) 
302 
50 
Contained single uninucleate parasites, of which 
42 ®/o were small, 25 ®/q medium-sized and 13 "/p 
large. 
197 
33 
Contained two uninucleate parasites, of which 40 
were small, 53 “/p medium-sized and 7 “/o large. 
72 
12 
Contained binucleate single parasites, i.e. dividing 
forms about to give rise to two (or more) para¬ 
sites. 
21 
3-5 
Contained four uninucleate parasites. 
7 
1 
Contained two parasites each binucleate, i.e. in the 
act of giving rise to four parasites. 
1 
Total 600 
0-1 
Contained three parasites, two being small and uni¬ 
nucleate ; the other larger and binucleate, i.e. 
about to give rise to two parasites. 
The parasite has already been adequately described in my previous 
paper, where the characters which serve to differentiate it from P. canis 
are also considered. The parasite cannot be confused with P. gihsoni 
Patton 1910 which occurs in the jackal in India. 
There is little to add to the earlier description. Further observation 
has only confirmed what I have previously stated with regard to 
the parasite. I may, however, add the following remarks: In 19 out 
of the 600 parasites, small, single blue-staining spheres or ovoid bodies 
were seen lying apparently detached and to one side of the parasite ; in 
three instances there were two such detached masses. These bodies 
may have been actually thrown off by the parasite, or possibly they 
were connected thereto by invisible strands of protoplasm ; none of 
these bodies appeared to contain chromatin. In 15 out of the 600 para¬ 
sites examined, a small intensely staining chromatin granule was observed 
' 2000 corpuscles were counted. 
