282 H. SAXTON BURR 
chr. EO a & 
ON RSS 
BEN ee 
vey SS STD 
Fig. 10 Section through lamina terminalis, showing cellular detail. X 175. 
It., lamina terminalis; vc., ventricular cavity. 
Fig. 11 Section through median alar plate, showing arrangement of cells. 
X 175. tr., terminal ridge; vc., ventricular cavity. 
Fig. 12 Section through chiasmatic ridge, showing the continued cellular 
increase in the median basal region. 
175. chr., chiasmatic ridge; vc., ventric- 
ular cavity. 
