PLATE XXIX. 



Fig. 4. — Ventral view of brain. X 26. 



All labels as in fig. 1. 



Fig. 5. — Posterior view of model divided at MN. X 26. 



Aqu. Syl. — Aqueduct of Sylvius. 

 P.— Plexus. 



Po. — Cavity of pineal body. 

 All other labels as in fig. 1. 



Fig. 6. — Anterior view of section PWZO. X 26. 



3V. — Third ventral of brain. 

 Ho. — Cavity of hypophysis. 



