Editorial note — Part 1.-- Vertebrata. (continued 3)
Reading edition
The olfactory lobes are fused in the middle line. There is no corpus callosum, nor is there a middle commissure to the third ventricle. The cerebral hemispheres are not convoluted, and, looked at from the dorsal aspect, do not hide the thalamencephalon and mid-brain. The pineal gland lies in the cranial wall and not deeply between the hemispheres, and its stalk is longer and tilts forward.