D. L. MACKINNON 
187 
extra-nuclear. I have observed two flagella, one of which is locomotor 
in function, while the other generally lies within the cytostome 
and aids in the ingestion of food-particles. Each flagellum arises 
from a-distinct basal granule near the anterior border of the cytostome. 
The highly vacuolar cytoplasm is often full of ingested bacteria. The 
cysts are of the same form as those of E. agilis, but are proportionately 
Fig. 22. Emhadomonas alexeieffi. Individual with double crescent-shaped chromatin 
mass. Early stage of division ? 
Fig. 23. Emhadomonas alexeieffi, containing numerous ingested bacilli. 
Fig. 24. Fig. 2.5. 
Fig. 24. E. alexeieffi. Early stage of encystment. 
Fig. 25. E. alexeieffi. Later stage of encystment. 
larger (5 yu, x 4 yu, to 6 /i x 5 /a) (Figs. 24 and 2.5). In the newly-formed 
cyst the nucleus is of the vesicular type, but it soon loses its membrane, 
and the chromatin escapes to form irregular groups of granules in the 
anterior end of the cyst. The borders of the cytostome persist as dark- 
staining, loop-shaped strands. There is frequently visible around the 
