214 



SENESCENCE AND REJUVENESCENCE 



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Figs. 86-93. — Reconstitution in short pieces of Planaria dorotocephala: Fig. 86, 

 body-outline, indicating levels of section; Figs. 87-89, biaxial and single heads formed 

 independently of other parts; 90, biaxial form with partial body; Fig. 91, headless 

 piece without reconstitutional changes in the anterior region; Fig. 92, anophthalmic 

 form in which anterior region has imdergone reconstitution into the anterior and 

 middle body-region of a whole worm; Fig. 93, biaxial tails. 



