THE DIENCEPHALIC FLOOR 239 
Mieseaaaest Beyaneae 
ee mite : 
eyes 1 ‘Fy a LEA 
13 
Fig."10 Mesial view of forebrain reconstruction of 12mm. cat embryo. X 100. 
The unshaded area shows the cut surfaces of the reconstruction. 2, chiasmatic 
process; 4, chiasm; 9, foramen of Monro; 11, infundibular stem; 12, infundib- 
ular canal; 13, infundibular process; 20, lamina terminalis; 26, mammillary 
recess; 32, post-chiasmatic eminence; 33, post-chiasmatic recess; 34, post- 
infundibular eminence; 35, post-infundibular recess; 37, post-mammillary evagi- 
nation; 38, pre-chiasmatic recess; 41, supra-optic crest; 42, supra-optic recess. 
