198 Journal of Comparative Neurology. 



10. The fourth nerve is distributed in part to the meta- 

 plexus ( or the dura). It is possible that such fibers are sensory, 

 although no distinct ganglion was seen. 



11. Myelinic nerve fibers from the mesencephal pass to 

 the ectal surface of the brain immediately ventrad of the epi- 

 physis ; these may possibly represent a parietal nerve. 



12. The optic nerve in Necturus is hollow for a portion 

 of its length and the fibers of which it is formed are amyelinic ; 

 being in both these respects in a primitive condition. 



Ithaca, N. Y., June, 1895. 



LIST OF PAPERS REFERRED TO.* 



'83. Ahlborn, Friedrich. Untersuchungen iiber das Gehirn der Petromy- 



zonten. Zeitsch. f. wiss Zool. Vol. XXXIX, pp. 191-294. 

 '82. Bellonci. Intorno alia struttura e alia connessioni dei lobi olfattorii 



negli artropodi superior! e nei vertebrati. R. Accademia dei Lincei. 



Memorie XIII. 

 '83. Bellonci. Sur la structure et les rapports des lobes olfactives dans les 



arthropod! superieures et les vertebres. Archiv Italiennes de Biologic. 



1883. 

 '87. Bellonci. Sulle Commissure cerebrali anteriori degli Anfibia e dei Ret. 



tili. Mem. del Real Accad. del Sci. dell. Istituto di Bologna. Ser. IV, 



Tom VIII. 

 '90. Boettiger, a. Beitrag zur Lehre von den chronischen progressiven 



Augenmuskellahmungen und zur feineren Hirn-anatomie. Arch. f. 



Psychiatrie. Vol. XXI. p. 554. 

 '93. Brandis, F. Untersuchungen iiber das Gehirn der Vogel. II Theil: 



Ursprung der Nerven der Medulla oblongata. Arch. f. mikr. Anat. 



Vol. XLI, pp. 623-649. 

 '94. Brandis, F. Untersuchungen iiber das Gehirn der Vogel. II Theil : 



Ursprung der Nerven der Oblongata. Arch. f. mikr. Anat. Vol. 



XLIII, pp. 96-116. 

 '91. BuRCKHARDT, R. Untersuchungen am Hirn und Geruchsorgan von Tri- 

 ton und Ichthyophis. Zeit. f. wiss. Zool. LIL, pp. 369-403. 

 '92. BuRCKHARDT, R. Das Centralnervensystem von Protopterus annectens. 



Octavo, pp. 64, 5 PI. Berlin. 



* No bibliography of the brain in Amphibia is attempted. An apparently 

 quite complete bibliography of the literature upon the central nervous system 

 of the Ichthyopsida, comprising 395 titles, is given in a paper by A. Sanders, 

 entitled " Researches in the Nervous System of Myxine glutinosa,^^ London & 

 Edinburgh, Williams & Norgate. 1893. 



