.MORPHOLOGY IN TRICHOMONAS TERMOPSIDIS. 



79 



FIG. 4. These figures (Fig. 4 and Fig. 5.) are drawn to show the succession of 

 nuclear changes during mitosis. The chromatic basal rod, undulating membrane, 

 and anterior flagella are also indicated in order to orient the specimen. All material 

 fixed in Schaudinn's fluid, drawn with the aid of camera lucida, and reproduced at 

 a magnification of 2000. 



A. Resting nucleus, showing karysome. 



B. Chromatin beginning to condense and break up into irregular fragments that 

 tend to arrange themselves linearly. Chromidia appearing in the cytoplasm. 



C. Linear arrangement of chromatin more pronounced, centroblepharoplast has 

 released centrosome, which has just divided, as has the blepharoplast and rhizoplast. 

 New chromatic basal rod appearing, accompanied by thin undulating membrane. 

 Cytoplasmic chromidia disappearing. 



D. Flagella, chromatic basal rod, and undulating membrane completely dupli- 

 cated; paradesmose has descended to nuclear membrane. 



E. Chromosomes strung over the subparadesmosal fiber judging from the 

 complex appearance and probable number, they have already divided. 



