' 
THE DIENCEPHALIC FLOOR 247 
29 
Fig. 15 Mesial view of forebrain reconstruction of 8 somite chick. X 150, 
The unshaded area shows the cut surfaces of the reconstruction. 24, mid-brain; 
28, neuropore; 29, optic evagination; 46, tubercle of the floor of Schulte. 
24 8 
hy 
Eli 
uy 
Saat 
EY 
17 
46 31 
Fig. 16 Mesial view of forebrain reconstruction of 20 somite chick. >< 150. 
The unshaded area shows the cut surfaces of the reconstruction. 8, ectoptic 
zone of Schulte; 17, infundibular region; 20, lamina terminalis; 24, mid-brain; 
25, mammillary region; 29, optic evagination; 31, optico-infundibular groove; 
46, tubercle of the floor of Schulte. 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 25, NO. 3 
