Gr. H. F. Nuttall 
115 
DESCRIPTION OF PLATES X AND XI. 
The drawings were executed in water-colours. They were drawn to scale with the aid 
of a Winkel Camera-Lucida and Zeiss 2 mm. (oil immersion) objective: using ocular 
No. 18. The size of the parasites was determined by the use of a Zeiss stage micrometer 
scale projected upon the paper upon which the drawings were made. 
PLATE X. 
Piroplasma rossi n.sp. 
x 3600. 
With the exception of the parasite depicted in Fig. 1, which was found in a liver-smear, 
all of the parasites figured were encountered in smears from the spleen of the Jackal. 
Intracorpuscular parasites. 
Figs. 1—3. Uninucleate parasites showing vacuoles and sharply defined or (Fig. 2) diffuse 
contour with indications of amoeboid movement. Nucleus compact. 
Fig. 4. Large ovoid parasite with central nucleus of irregular flowing form with the 
chromatin diffused. 
Figs. 5—6. Large rounded parasites containing two nuclei distant from each other. These 
parasites are about to divide. 
Fig. 7. Two parasites possessing a somewhat pyriform shape. 
Fig. 8. Two parasites showing amoeboid movement and diffused chromatin. 
Figs. 9—10. Pairs of parasites. Those in Fig. 10 are very large and each shows a large 
mass of chromatin, the appearance suggesting that the parasites might well be about 
to divide into two. 
Figs. 11—14. Pairs of parasites with diffuse or irregular chromatin. In the parasite to 
the right in Fig. 14 the chromatin is drawn out in a thread and becoming concen¬ 
trated in masses at the ends of the thread. 
Fig. 15. The parasite to the left appears to have just undergone simple nuclear division, 
the connecting thread between the flowing chromatin mass having ruptured. In the 
parasite to the right the nuclei have already become rounded and lie at opposite poles 
of the parasite. Both parasites show evidence of amoeboid motion. 
Figs. 16—17. Pairs of parasites in which the nuclei have subdivided preparatory to the 
formation of four intracorpuscular parasites. Achromatic lines occur in the blue- 
staining protoplasm. 
Figs. 18—19. Corpuscles containing three parasites, one of which contains two nuclei at 
opposite ends of the parasite; it represents a dividing form. Each corpuscle contains 
a pair of parasites which have just undergone division. 
Figs. 20—22. Corpuscles containing four parasites, some of which are amoeboid. 
Figs. 23—24. Parasites seen in almost dehaemoglobinized corpuscles. 
Fig. 25. A parasite presenting a sharply defined bubble-like appearance with the blue- 
staining protoplasm condensed peripherally and similarly altered (dividing ?) nucleus 
to one side. 
