254 FREDERICK TILNEY 
Fig. 21 Mesial view of forebrain reconstruction of 14 days and 18 hours 
chick. XX 25. 1, aqueduct of Sylvius; 2, chiasmatie process; 3, cerebellum; 
4, optic chiasm; 7, epiphysis; 9, foramen of Monro; 1/2, infundibular canal; 
14, infundibular process, saccular surface; 15, infundibular process, pituitary 
surface; 24, mid-brain; 26, mammillary recess; 27, mammillary body; 32, post- 
chiasmatic eminence; 33, post-chiasmatic recess; 36, post-infundibular emi- 
nence; 38, pre-chiasmatiec recess; 39, paraphysis; 41, supra-optic groove; 42, 
supra-optic recess; 44, telencephalon. 
by an extremely small canal, while the infundibular recess 
presents many branching subdivisions which extend to the 
several diverticula of the dorsal convoluted surface. The 
post-infundibular eminence occupies its characteristic position 
and has not changed in size. It still retains the post-infundib- 
ular recess of the ventricle. 
