THE DIENCEPHALIC FLOOR 249 
(46). Ectally the mammillary and infundibular regions present 
distinct eminences. 
Chick of 108 hours; 6.75 mm.; Specimen No. 371 (fig. 17). The 
tendency of the infundibular region (17) to assume a more ventral 
relation with reference to the mammillary region is here more 
pronounced. Otherwise, with the exception of the greater 
Fig. 18 Mesial view of forebrain reconstruction of chick of 5 days and 20 
hours. XX 100. The unshaded area shows the cut surfaces of the reconstruction. 
2, chiasmatie process; 4, chiasm; 7, epiphysis; 13, infundibular process; 20, 
lamina terminalis; 25, mammillary region; 32, post-chiasmatic eminence; 33, 
post-chiasmatic recess; 36, post-infundibular eminence; 38, pre-optic recess; 
39, paraphysis; 41, supra-optic crest; 42, supra-optic recess; 44, telencephalon; 
45, tuberculum postero-superius; 46, tubercle of the floor of Schulte. 
