566 Journal of Comparative Neurology and Psychology. 



EXPLANATION OF PLATE VH. 



Fig. 19. A projection upon the sagittal plane of the origin of the first spinal nerve, in an individual 

 of 120 mm. length, seen from the right side. 



Fig. 20. A projection upon the sagittal plane of the olfactory nerve, its roots and principal branches. 



Fig. 21. A projection upon the •sagittal plane of the IX-X, and V-VII-VIII ganglionic com- 

 plexes, and the plexus developed between the FX -X, and VII nerves. The roots of the ganglia are 

 omitted. In the individual from which the plotting was made Jacobson's commissure is double; from 

 the r. pharyngeus IX there passes an anastomosis to the tr. hyomandibularis VII. The V-VII-VHI 

 ganglionic mass is much more compact than in younger individuals, such as shown in figs. I, 13 and 

 24. 



Fig. 22. Composite sagittal section through the insertion of the retractor and levator bulbi muscles 

 upon the antorbital cartilage, as seen from the left side. The eyeball and the greater portion of the 

 eye-muscles are situated lateral to the section and are represented in dotted outlines. For the sake of 

 clearness the branches of the r. ophthalmicus profundus V and of r. ophthalmicus superficialis VII 

 are omitted. The outlines of the section were drawn with a camera lucida. 



