PLATE 2 



EXPLANATION OF FIGURES 



16 Cross section through the middle of one of the dedifferentiated sister 

 cells at division shown in figure 4. a., anlagc or remains of the gullet after 

 dedifferentiation. 



17 Same as figure 16. but at beginning of differentiation of gullet as shown in 

 figure 5. 



IS Cross section through middle of fully differentiated cell. From same 

 level as figures 16 and 17. »/., membranelles; s., septum; g., gullet. 



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