DIFFERENTIAL DEVELOPMENTAL MODIFICATION. Ill 251 



region of the body is also decreased in size and flat instead of rounded; the 

 tail appears to arise farther dorsally, the sensory vesicle and tail are closer 

 together, and the papillae at the "anterior" end are more dorsal than in 



Fig. 99, A-G. — Uninhibited and differentially inhibited larval development of Corella 

 willmeriana. A, uninhibited before hatching; B, fully developed larva; C, tail partially re- 

 sorbed; D, tail completely resorbed; E, F, G, lesser degrees of differential inhibition (from 

 Child, ig2jd). 



uninhibited individuals. Comparison of Figure 99, A and B, with Fig- 

 ure 99, E-G, less extremely inhibited forms, and with Figure 100, more 

 extreme inhibitions, will show the differences. Differential reduction of 

 KMnO^ in developing larvae indicates the tail as the most intensely active 



