GENUS: CERCOMONAS 



631 



become united by tlieir posterior ends, and gradually fuse. The nuclei 

 unite, and at this stage the flagellate has the appearance of a uninucleate 



^C^% ' 



^J^ 



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Fig. 259. — Cercomonas longiccmda (x ca. 2,000). (After Wen yon, 1910, 1913.) 



1-2. Flagellate showing attached flagelluni passing over surface of body. 

 3-9. Various stages of division; the blejiharoplast functions as a centrosome. 

 10. Encysted form (stained). 11. Encysted form (living). 



organism with two flagella. The flagella are then lost, and encystment 

 in a spherical cyst takes place. 



