I2O H. L. RATCLIFFE. 



PLATE 2. 



FIG. 2-3. Nucleus moves forward and changes from elipsoidal to ovoidal. 

 Chromatin threads shorten and thicken. Intranuclear body has divided and 

 lies on the nuclear membrane. Flagellum is retracted, the mass at the 

 bifurcation becomes smaller as the blepharoplasts move apart. 



FIG. 4. Nucleus in contact with the base of the reservoir. The new 

 blepharoplasts are formed from the divided intranuclear body, definite 

 rhizoplasts connect them to the nucleus, and new axial fibers grow out 

 from them. The old blepharoplasts are wide apart. The flagellum begins 

 splitting and the mass at the bifurcation disappears. The endosome be- 

 comes condensed in appearance and the vacuole disappears. The chromatin 

 threads continue shortening and condensation. 



FIG. 5. Chromosomes are quite condensed and their granular nature is 

 not so pronounced. The endosome begins elongation at right angles to the 

 long axis of cell and is composed of two parts. The new axial fibers have 

 united with the old ones and the flagellum has completely divided. 



FIG. 6. Chromosomes are uniform in appearance, lying in pairs about 

 the endosome, which continues elongation and is composed of three parts. 



FIG. 7. The metaphase. Chromosome pairs separate. Endosome con- 

 tinues elongation and is composed of two parts. 



FIG. 8. The anaphase. Constriction of nuclear membrane following 

 movement of chromosomes to poles of nucleus. Chromosomes undergo 

 longitudinal fission and become granular again. 



FIG. 9. The telophase. The endosome divides. Anterior border of 

 nuclear membrane drawn out to a point as the nucleus moves posteriorly. 

 Invagination of base of reservoir begins. 



FIG. 10. Daughter nuclei separated. Reservoir division completed. 

 Anterior end of organism widens. 



