PLATE 3 



KXPLANATIOX OK FIGURES 



12 Cross section of the forel)rain of a vinil.iterally operated larva through the 

 olfactory bulb showing the glomeruli and the absence of the olfactory bulb on the 

 operated side. X 160. 



13 Cross section of the forebrain (jf a normal larva at same level as figure 

 12 X 1(50. 



14 Cross section of the same forebrain that is figured in figure 12, 17 microns 

 caudally showing the first signs of the right telencelphalon. X 160. 



50 



