PLATE 25 

 All figures of Giardia enterica (Grassi) from human stools. X 3200. 



Fig. 14. Cyst containing degenerating(?) flagellate. Note persistence of 

 neuromotor system after loss of most of the cytoplasm. 



Fig. 15. First division of encysted flagellate; one nucleus still in prophase; 

 parabasals and axostyles duplicated; remnants of intracytoplasmie parts of the 

 flagella persisting. 



Fig. 16. Cyst of the spheroidal type. Nucleus on the left showing parades- 

 mose and equatorial plate of the first division. Parabasals greatly enlarged. 



Fig. 17. Ellipsoidal cyst. Somewhat abnormal telophase of the first divison 

 in central nucleus; cytoplasmic inclusion at the right (remnant of peristomal 

 fiber?). 



Fig. 18. Ovoidal cyst. Flagellate with first division completed; all nuclei 

 anterior; V-shaped posterior peristomal fibers fading out, their jiroximal ends 

 shifting posteriorly. 



Fig. 19. Asymmetrical irregular cyst. Second division approaching with one 

 nucleus in telophase, one in late prophase, and the others early prophase; four 

 sets of parabasals present. 



Fig. 20. Characteristic cysts with four anterior nuclei. 



Fig. 21. Greatly elongated cyst with sister flagellates at opposite poles of 

 the common protoplasmic mass and of the cyst. 



Fig. 22. Cyst showing the extreme phase of the spheroidal form. Both 

 zooids anterior, parabasals greatly enlarged. 



[232] 



