236 J. MCA. KATER. 



PLATE III. 



FIGS. 26 TO 29. Stages in the formation of wrinkled cyst wall and the disap- 

 pearance of the starch bodies. 



FIGS. 30 TO 40. Made from sections four micra thick. 



FIG. 30. Early cyst. Metachromatic granules are forming around the nucleus. 



FIG. 31. The wall has become thicker than in the preceding case and the 

 metachromatic granules are scattered through the entire cell. Nucleus obscured. 



FIG. 32. The metachromatic granules are evenly distributed through the 

 cytoplasm. Wall becoming wrinkled. 



FIG. 33- The metachromatic granules are migrating to the periphery where 

 they will be dissolved. 



FIG. 34. The first indication of budding of the karyosome. A thickening 

 appears at the base of one of the anchoring strands. 



FIG. 35. The material which is going to form the new centriole and basal 

 granules appears as a chromatic ball on one of the anchoring strands. 



FIG. 36. The chromatic ball has reached the outside of the nuclear membrane. 



FIGS. 37, 38 AND 39. Stages in the migration of the basal granule towards the 

 periphery. 



FIG. 40. The basal granule has divided, the rhizoplast dividing with it. 



FIG. 41. Drawing made from whole mount. The organism is partly excysted 

 and the flagella are growing out. 



