PLATE 24 

 All figures of Giardi enterica (Grass!) from human stools. X 3200. 



Fig. 6. Dorsal view. Nuclei in prophase with four chromosomes in each; 

 centrosomes at opposite poles, each pair connected by a lateral paradesmose. 

 New anterolateral flagella with new anterior node appearing as an anterior out- 

 growth from the two blepharoplasts and anterior node. 



Fig. 7. Ventral view. Further outgrowth of new anterolateral flagella with 

 new cytostomal rim formed posteriorly; equatorial plate in left nucleus while 

 right nucleus is stUl in prophase; paradesmose visible on each nucleus; para- 

 basals fading out. 



Fig. 8. Ventral view. Nuclei in telophase; new intracytoplasmic organelles 

 completed; parabasals indistinct. 



Fig. 9. Dorsolateral view from the right showing nuclei in telophase; 

 paradesmose still persisting. Note rhizoplasts running anteriorly from the blunt 

 ends of the parabasals along the dorsal sides of the asostyles. The parabasals 

 are somewhat foreshortened and enlarged. 



Fig. 10. Ventral view. Nuclear division completed; new flagella not yet 

 appearing; axostyles, parabasals, posterior peristomal fiber, and nuclei all 

 duplicated. 



Fig. 11. Ventral view. Parabasals indistinct; new anterolateral flagella 

 completely formed; posterior peristomal fiber and nuclei duplicated; region of 

 union of axostyles, posterolateral flagella, ventral flagella, and posterior per- 

 istomal fiber greatly thickened. Longitudinal fission in frontal plane indicated. 



Fig. 12. Dorsal view of two sister individuals in late phase of plasmotomy 

 in frontal plane not yet separated posteriorly. Duplication of organelles com- 

 pleted. Parabasals indistinct. 



Fig. 13. Individual in early phase of encystment. The forming cyst has not 

 yet attained its typical ovoidal contour. Cyst wall forming about the partially 

 contracted tail, bilamellate posteriorly. 



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