Description of Plate 13. 

 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. 

 Ventral view. 



O. L. Olfactory Lobe. 

 Pros. Prosencephalon. 

 Thai. Thalamencephalon. 



Pt. Pituitary Body. 

 Met. Metencephalon. 

 I. Olfactory Nerve. 

 II. Optic Nerve. 



III. Oculo-motor. 



V. Trigeminal Nerve. 

 VII. Facial Nerve. 

 VIII. Auditory Nerve. 



IX. Glossopharyngeal Nerve. 

 X. Vagus Nerve. 



