312 
Piroplasmosis 
animals with tick-destroying dips or by removing the hosts from infested 
pastures for prolonged periods of time with the object of starving the 
ticks. 
Sporozoits in 
Fig. 9. Piroplasma canis, showing the developmental cycle in 
Rhipicephalus sanguineus according to Christophers (1912). 
Diseases due to Nuttallia. 
The first parasite belonging to this genus to be discovered was the 
one occurring in the horse to which Laveran (1901) gave the name 
of Piroplasma equi. As the morphology of this parasite does not agree 
with that of a true Piroqdasma, as defined by me, Franca (1909) placed 
it in another genus which he named Nuttallia. That he was justified in 
taking this step is clear from subsequent observations carried out upon 
the parasite by myself and Strickland (1910-1912, Fig. 10) in the course 
of which we clearly ditferentiated it from P. cahalli. Through the 
courtesy of Prof. E. J. Marzinowsky, of Moscow, Russia, I have been able 
to examine blood-films showing so-called piroplasms in deer and reindeer, 
and I can also refer these to the genus Nuttallia. 
