lhe blo(Ki of tlie jackal mentioned abcna* clied on February 28 th, 
its blood was swanninc,- with Piroplusma inbsoni: no post-mortem 
examination was matle. \o, 2 \\hich was inocidated on 
Jannan- ist. 'v\ith one drop of blood from the ear of Dog' 1 
developed Piroplasmii ^s^ibsoni on Febrnarv 22nd ; this experi- 
ment rlearly denionstrates the long incubation period especiallv 
when a .small quantité of virulent blood is used. — F)og Xo. i 
was inoculated with blood from a hound (f'dippant) on IDecember 
21 st. iQüq and it developed Piroplusma gibsoiii on December 
26 th. : it wns destroyed later and its heart blood inoculated into 
Dogs Xos. 3 and 4 both of which bave since died. 
OuL of fifteen vouug jac'kals examined, Piroplasina gibsoni has 
been found in three, two of these Xvjs. 9 and 10 are at présent in 
the laboi't'.tory. One gorgefl female tick Rhipicephaliis (sp. in- 
cert.) has been recovered from jackal X’^o. 10 and it is hoped lafer 
that feeding experiments aiming at the discoverv of the exact 
method of transmission mav be satisfactorilv carried ont. Profes 
sor Xfc;u;\i.\NX informs me that this species of Rhipicephalus is 
m ail probabiiitv new to science, it is related to Rhipicephalus 
simus (Ixoch). 
The t\vo voung jackals referred to above are both infected with 
the mammalian haemogregarine alreadv noted, so that 1 hâve 
been able to studv this parasite in the peripheral blood. The ob¬ 
servations hâve ruade it quite clear that it is distinct from the 
similar one found in the dog in many parts of the world. It is 
chiefh’ seen as a round bod}" surrounded with a marked cvtocvst 
lying in the protoplasm of a leucocyte of uncertain tvpe, it does 
not stain well with Rom'anowsky’s stain ; some of the forms are 
more elongated but never as large as the dog parasite. Xo free 
vermicides hâve been seen in the peripheral blood. From its 
smaller size, less elongated shape, and the fact that its asexual 
multiplication takes place in the spleen as well as in the bone 
marrow, I consider this parasite represents a new species. I now 
propose adopting for these parasites the generic name Leucocyio- 
gregorina recentlv suggested bv Miss Porter (Science Progress, 
No. 14, october 1909) as the name Leiicocytozoon was first ap- 
plied to certain parasites of birds. As the jackal parasite is evi- 
dentlv a distinct species I propose for it the spécifie name rotun- 
data suggested bv the shape of the enevsted trophozoit. This par¬ 
asite will therefore be known as T.eucocyfngrcgarina rotundata. 
