



r^n) 



^^>t 



■i 





SSli 



GRANT I A COM PRESS A 



P'iGS. 1-1 A. — Side view of newly hatched amphiV)lastula. 



Fig. 2. — Same, slightly older. Posterior granular cells beginning to over- 

 grow columnar cells. 



Figs. 3-6. — Side view of abiiormal amphil.)lastulae, showing irregular growth 

 of granular cells after ccntrifuging. 



Fig. 7.- — -Fixed larva seen from above. 



Figs. 8-9. — Same a day older. Large granular cells dividing to form 

 epithelium. 



