86 Journal of Comparative Neurology. 



Fig. iS. Through the postoptic decussation, olfactory areas, and the 

 epistriata. 



Fig. ig. Through the optic chiasma, olfactory commissure and olfactory 

 lobes. 



Fig. 20. Through the olfactory lobes and the nucleus thaeniae. 



PLATE VI. 



Fig. 31 . Transverse section of the lobus vagi and the nucleus funiculi at 

 about the same level as that of Fig. 7. 



Fig. 22, A and B. Sagittal sections of the cerebellum and of the hind 

 and mid brain to show the Purkinje cells and the course of their neurites. B 

 is farther laterally than A, and the roots of V and VI are diagrammatically 

 inserted from another section to show the fibers of V to the cerebellum. In A 

 is shown at a higher magnification the part included between the small crosses 

 in B. 



Fig. 2j. Three spindle cells lying close together in the lateral nucleus of 

 the acusticum, near tlie cephalic end. The endings of the VIII fibers are shown 

 in surface and profile. 



Fig. 2^. Root of the III nerve and adjacent structures. Iron haematox- 

 ylin. Transverse. At a is shown a part of the section immediately behind the 

 decussation of HI, to show how the cavity drops to the level of the spindle cell 

 fibers. Compare Fig. 2. The nucleus of III is shown larger in the main figure 

 than it really is. It is this large just in front of the decussation of the roots. 



Fig. 2^. One of the pyramidal cells from the surface of the tectum. 



Fig. 26. An epistriatum cell in transverse section. 



PLATE VII. 



Fi^. 2~. Section of an end-bud from the dorso-lateral surface of the body 

 in about the region of the second spinal nerve. X about 730. 



Fis;. 28. The head of Lampetra in lateral and ventral views to show the 

 distribution of the lateral line organs. 



Ft;;. 28 a. .Section of a lateral line organ. Only a few sense cells and two 

 supporting cells are shown. 



Fig. 2g. Diagram of the sensory roots are seen from the side. 



PLATE VIII. 



f^'S- 30- Diagram showing the approximate course and position of the 

 chief fiber tracts. The brain is considered as a transparent body viewed from 

 the sidp. In a t^^eneral way the depth of the lateral tracts beneath the surface 

 is shown by the shading, the deeper tracts being more heavily shaded, those 

 near the cavity black. As in Fig. i, the VII-VIII roots are placed too far cau- 

 dally. The figure is rather a sketch than an accurate scheme, since the limita- 

 tions of black and white re]>rodiiction make it impossible to show the several 

 structures in their exact positions. The relationships are, however, truly 

 indicated. 



