374 DEVELOPMENT OF ORGANS IN MAMMALIA. [CHAP, 

 FIG. 120. 



LONGITUDINAL VERTICAL SECTION THROUGH THE ANTERIOR 

 PART OP THE BRAIN OF AN EMBRYO RABBIT OF FOUR 

 CENTIMETRES. (After Mihalkovics.) 



The section passes through the median line so that the cere- 

 bral hemispheres are not cut ; their position is however indicated 

 in outline. 



spt. septum lucidum formed by the coalescence of the inner walls 

 of part of the cerebral hemispheres ; cma. anterior com- 

 missure ; frx. vertical pillars of the fornix ; cat. genu of 

 corpus callosum ; trm. lamina terminalis ; hms. cerebral 

 hemispheres ; olf. olfactory lobes ; ad. artery of corpus 

 callosum ; fmr. position of foramen of Monro ; chd 3. choroid 

 plexus of third ventricle ; pin. pineal gland ; cmp. posterior 

 commissure ; bgm. lamina uniting the lobes of the mid- 

 brain ; chm. optic chiasma ; hph. pituitary body ; inf. infun- 

 dibulum ; pns. pons Varolii ; pde. cerebral peduncles ; agd. 

 iter a tertio ad quartum ventriculum. 



