148 ARTHUR DBNDY. 



(7) The ancestors of existing vertebrates possessed a pair of 

 parietal eyes, which may liave been serially homologous with 

 the ordinary vertebrate eyes. 



5. List of References. 



The I'ollowing list contains only the titles of such memoirs as I have been 

 able personally to consult, and is therefore by no means a complete biblio- 

 graphy of the subject. 



1. AuLBORN, F. — " Untersuchungen iiber das Gehirn der Petromyzonten," 



* Zeitschrift fiir wissenschaflliche Zoologie,' Bd. xxxix, 1883, p. 191. 



2. Balfour, F. M. — ' A Treatise on Comparative Embryology,' vol. ii, 



1881. 



3. Beard, J.— "The Parietal Eye in Fishes," 'Nature,' vol. xxxvi, 1887, 



pp. 24G and 340. 



4. Beard, J. — " The Parietal Eye of the Cyclostoine Fishes," ' Quart. 



Journ. Micr. Sci.,' vol. xxix, 1888, p. 55. 



5. Beraneck, E. — " Sur le nerf parietal et la raorphologie du troisieme ceil 



des Vertebres," ' Anatomischer Anzeiger,' vol. vii, 1892, p. 674. 



6. Beraneck, E. — " L'individualite de Tobil parietal," ' Anatomischer An- 



zeiger,' vol. viii, 1893, p. G69. 



7. Bernard, H. M. — "An Attempt to deduce the Vertebrate Eyes from 



the Skin," * Quart. Journ. Micr. Sci.,' vol. xxxix, p. 343. 



8. BuRCKHAitDT, B. — "Die Homologieu des Zwischenhirndaches, und ihre 



Bedeutung fiir die Morphologie des Hirns bei uiederen Vertebrateu," 

 'Anatomischer Anzeiger,' Bd. ix, 1894, p. 152. 

 8. BuRCKHARDT, B. — " Die Homologien des Zwischenhirndaches bei Kep- 

 tilien und Vogeln," ' Anatomischer Anzeiger,' Bd. ix, 1894, p. 320. 



10. Dendy, a. — " Summary of the Principal Results obtained in a Study of 



the Development of the Tuatara (Sphenodon puuctatum)," 

 ' Proceedings of tlie Royal Society,' vol. Ixiii, 1898, p. 440. 



11. Eycleshymer, C. — " Paraphysis and Epiphysis in Aroblystoma," 



'Anatomischer Anzeiger,' vol. vii, 1892, p. 215. 



12. Gaskell, W. H. — " On the Origin of Vertebrates from a Crustacean-like 



Ancestor," 'Quart. Journ. Micr. Sci.,' vol. xxxi, 1890, p. 379. 



13. Gaskell, VV. H. — "Opening Address, Piiysiological Section, British 



Association," 'Nature,' vol. liv, 1896, p. 551. 



