256 J. B. JOHNSTON, 
Plate der 
Photographs 8 to 28 inclusive are from a series of transverse 
sections of the brain of a fish about 30 cm in length. Haematoxylin. 
Topographical relations and some of the results of the study of Goucı 
sections are shown in the accompanying drawings. All sections magni- 
fied 20 diameters. 
Phot. 8. Through one of the caudal rootlets of the X nerve, and 
the caudal extremity of the cerebellar crest. 
Phot. 9. Through the dorsal root of the IX nerve. 
Phot. 10. Just in front of IX, and through the most caudal ex- 
tremity of the lobus lineae lateralis. 
Phot. 11. Through the nervus lineae lateralis, Xth portion. 
Phot. 12. Through dorsal and ventral portions of the nervus lineae 
lateralis VII, and the VIII nerve. Anterior extremity of lobus vagi. 
Phot. 13. Through dorsal and ventral roots of the VII nerve 
proper, and the anterior edge of the nervus lineae lateralis VII. 
Phot. 14. Through the dorsal and ventral roots of the V nerve. 
Phot. 15. Through the lateral lobes of the cerebellum, the nucleus 
of the secondary vagus tract, and the caudal part of the decussation 
of the bundles of Meyxerr. 
Phot. 16. Through the cephalic part of the latéral lobes of the 
cerebellum and the caudal border of the tectum. 
Phot. 17. Through the valvula and tectum at the entrance of 
the tractus tecto-cerebellaris into the cerebellum. 
Phot. 18. Through the cephalic border of the bridge connecting 
the wall of the mid brain with the cerebellum. The saccus appears 
also in the sections from which Phots. 15, 16 and 17 were taken, 
but was not included in the photographs. 
Phot. 19. Through corpus mammillare and caudal part of the hypo- 
physis, showing saccus-tubes penetrating into the hypophysis. 
Phot. 20. Through cephalic part of corpus mammillare. Lateral 
parts of the cavity of corpus mammillare disappearing. 
Phot. 21. Through caudal part of lobi inferiores. First appearance 
of the lateral extensions of cavity. 
Phot. 22. Through lobi inferiores and commissura posterior. 
Phot. 23. Through chiasma and the caudal part of epistriatum. 
Phot. 24. Through nucleus taeniae and corpus striatum, 
Phot. 25. Through commissura anterior. 
Phot. 26. Through fore brain in front of commissura anterior. 
Phot. 27. Through fore brain at junction with olfactory lobes. 
Phot. 28. Through lobi olfactorii. Dorsal surface turned toward 
the left. 
