263 
or thick films of various viscera. Examine for cystic 
stages, with a low power lens, especially the liver, 
or in the case of snakes, the lungs. 
Haemogregarines of Mammals 
1. Hg. balfouri .—In the jerboa (Jaculus spp.) 
four forms occur. (1) Endoglobular, sausage-shaped 
parasites, about 6 by 2^ in size, with a voluminous 
nucleus. The red cells are deformed and may 
be reduced to a mere trace. (2) Free forms, 
1 of the same appearance as the former. They are 
most readily found in liver smears. (3) A 
typical motile vermicule, 15^ long (rarely found). 
(4) Schizogony occurs in the liver—the final stage is 
that of a cyst, formed by the remains of the liver cell, 
containing merozoits. The cysts measure 23 by 17^ 
(but some are much longer and others smaller), con¬ 
taining as many as thirty merozoits (Fig. 79). 
The mode of development is unknown. 
