Desceiption" of Plate 12. 



The Brain of Necturus maculatus. 



Photograph of a model which was enlarged twenty diameters ; 

 in the plate it is reduced to about six and a quarter diameters. 

 Dorsal view. 



O. L. Olfactory Lobe. 

 Pros. Prosencephalon. 

 Thai. Thalamencephalon. 

 Mes. Mesencephalon. 

 Epen, Epencephalon. 



Met. Metencephalon. 

 4th V. Fourth Ventricle. 

 6. g. Gasserian Ganglion. 

 V. g. Ganglion of the Vagus. 



I. Olfactory Nerve. 

 II. Optic Nerve. 

 III. Oculo-motor Nerve. 

 V. Trigeminal Nerve. 

 VII. Facial Nerve. 

 VIII. Auditory Nerve. 

 IX. Glossopharyngeal Nerve. 

 X. Vagus Nerve. 



