F"iG. 3 is a magnified view of the portion of Fig. 2 next 

 to the internal limiting membrane. Two of the neuroblast- 

 niiciei at x have become tilted over to the extent of 00'', 

 while others in the vicinit\' show earlier stages of this dis- 

 placement, o.n.f. — -rudiments of optic nerve fibres. 



