PLATE XXX. 



Fig. 7. — Ai/lcrioi' view of section RVUT. x 27. 

 3V. — Third ventricle of brain. 

 IV. — First ventricle of brain. 

 2V. — Second ventricle of brain. 

 For. Mon. — Foramen of Monro. 

 PL— Plexus. 

 All other labels as in fig. 1. 



Fig. 8. — Dorsal vietv illustrating brain rarities, x 27. 



Olf. V. — Olfactory ventricle. 

 IV. — First ventricle of brain. 

 2V. — Second ventricle of brain. 

 3V. — Third ventricle of brain. 

 Opt. V. — Optical ventricles. 

 For. Mon. — Foramen of Monro. 

 Sp. Cnl. — Spinal canal. 



Fig. 9. — Side view illustrating brain cavities, x 27. 

 4V. — Fourth ventricle of brain. 

 PI— Plexus. 



Ho. — Cavity of hypophysis. 

 Aqu. Syl. — Aqueduct of Sylvius. 

 Other labels as in fig. 8. 



Fig. 10. — Diagram of cavities of pineal body and pariental eye in 



vertical plane. X 54. 



Fig. 11. — Diagram of cavities of pineal body and parietal eye in 

 horizontal plane. X 67. 



