112 
Haematozoci in Wild Animals 
corpuscles contained parasites in various stages of development, as 
shown (bracketed “D”) in the subjoined table: 
No. of r.b.c. 
which contained parasites as follows 
As figured in Plate X 
33 
2 parasites each with a single nucleus. 
Figs. 7—12. 
81°/o 
29 
1 parasite with a single nucleus. 
Figs. 1—4, 23, 24 
11 
4 parasites each with a single nucleus. 
Figs. 20—22. 
6 
1 parasite with two nuclei. 
Figs. 5—6. 
3 
2 parasites each with two nuclei. 
Figs. 15—17. 
9% 
3 
2 parasites each with nuclei showing processes. 
Figs. 13—14. 
(D) - 
3 
3 parasites: two containing single nuclei 
and one containing two nuclei. 
Figs. 18—19. 
, 2 
1 parasite with nucleus showing processes. 
As in Fig. 14. 
Free parasites. With but one exception all of the parasites which 
were encountered outside of corpuscles possessed a single nucleus. The 
one parasite which contained two nuclei (PI. X, Fig. 28) may have issued 
prematurely from the corpuscle owing possibly to mechanical injury to the 
latter in preparing the blood-film. Of the uninucleate free parasites five 
occurred singly, eight in couples, and four in one group, suggesting in the 
latter instances that the parasites had just escaped from corpuscles. From 
the appearance of the films, many corpuscles were injured when the smear 
was prepared, consequently no great stress can be laid upon the number 
of free forms encountered. In the absence of observations upon the 
living parasite, it is impossible to know in what manner the parasites 
enter the corpuscles they invade. 
Haemogregarina canis adusti n.sp. 
Plate XI, Figs. 1—5. 
This parasite, of which only eight specimens were discovered in 
smears from the jackal’s spleen, appears to be the first haemogregarine 
recorded as occurring in an African carnivore. The parasites measured 
10 x 4’3 g to 13 x 6'3 g in size. Three of the eight parasites were con¬ 
tained in mononuclear leucocytes whose nuclei appeared compressed or 
distorted from contact with the parasite (Plate XI, Figs. 4, 5). Some 
of the parasites showed a distinct cytocyst. Otherwise there is nothing 
special to note. I herewith append a list of the haemogregarines oc¬ 
curring in mammals; all of them have been discovered of recent years. 
Whereas some of them occur in red blood corpuscles, others occur in 
