'202 MAMMALIA. 



FIG. XI. 



(THE SAME.) 



1. CEUS of the brain of the left side, which is perfect. 



2. Crus of the brain of the right side divided and turned up. 



3. Involuntary centre placed between the posterior layer of the annular tubercle 



and the ventricular cord, forming the floor of the fourth ventricle. 



4. Posterior layer of the annular tubercle, passing through the crus of the brain. 



5. Optic tract turned up. 



6. Nates. 



7. Annular tubercle divided. 



8. Trapezoid body. 



9. Outer layer of the left pyramidal body. 



10. A more inner layer of the left pyramidal body, crossing to the right. 



11. Origin of part of the larger portion of the fifth nerve from the involuntary 



centre. 



12. Auditory nerve connected with the external portion of the restiform body. 



13. Hard portion of the seventh nerve proceeding from the trapezoid body. 



