STUDIES ON THE DYNAMICS OF MORPHOGENESIS 279 



u 



a 



d 



iff) 

 d 



■;'•;• 



e 





"X. 



r 



s 



6 



Figs. 1-3 'Normal wholes,' showing the different methods of regulation. Fig. 

 1, from a piece near the anterior end: fig. 2, from the second zooid; fig. 3 from the 

 anterior half of the postpharyngeal region. 



Figs. 4-6 'Teratopthalmic wholes.' Fig. 4 differs from the normal whole onlj' 

 as regards the eyes. Fig. 5 shows an extreme type of teratopthalmic whole with 

 small and slowly developing head. Fig. 6 shows various foi'ms of 'abnormal, 

 eyes, of which h = s are the more common types. 



