John Warren 25 
6. The supra-commissure appears first at 16-17 mm. It lies imme- 
diately cephalad to the stalk of the epiphysis and is comparatively small. 
7. The posterior commissure appears first at 15 mm., and there is a 
marked interval in the roof of the diencephalon between it and the 
epiphysis. 
I wish in conclusion to express my acknowledgments to Prof. Minot 
for his kind advise and interest in the preparation of this article. 
BIBLIOGRAPHY. 
The following are the principal articles consulted, but of course do not 
form a complete bibliography of this subject: 
1. BurcKHARDT, R.—Die Zirbel von Ichthyophis Glutinosus und Protopterus 
Annectens. Anat. Anz., Bd. VI. 
2. Die Homologien des Zwischenhirndaches bei Reptilien und Vogeln. 
Anat. Anz., Bd. IX, 320-324. 
3: Der Bauplan des Wirbeltiergehirns. Morpholog. Arbeiten, IV 
Bale Heft. d3ie 
4. Untersuchungen am Gehirn und Geruchsorgan von Triton und 
Ichthyophis. Zeitschr. f. Wiss. Zoologie, Bd. 52. 
5. Dexter, F.—The Development of the Paraphysis in the Common Fowl. 
American Journ. Anat., Vol. II, No. 1, 13-24. 
6. DENpy, A.—On the Development of the Pineal Eye and Adjacent Organs 
in Sphenodon (Hatteria). Quart. Journal Micros. Soc., Vol. 42, 111. 
7. D’Ercuis, F.—Contributo allo studio della volta del cervello intermedio 
e della regione parafisaria in embrioni di Pesci e di Mammiferi. 
Monitore Zoologico, VII, 118 e 201. 
8. EYCLESHYMER, A. C.—Paraphysis and Epiphysis in Amblystoma. Anat. 
Anz., Bd. VII. 
9. EYCLESHYMER, A. C., and Davis, B. M.—The Early Development of the 
Paraphysis and Epiphysis in Amia. Journal of Comp. Neurology, 
Vole t. 
10. FRANcoTTE, P.—Récherches sur le dévéloppement de L’épiphyse. Arch. 
de biologie, T. VIII. 
ile Note sur lil parietal, l’épiphyse, la paraphyse et les plexus 
choroides du troisiéme Ventricule.' Bull. de l’acad. royale, ete., d. 
Belg., 3 Serie, T. 27. 
12. Contribution 4 l'étude de l’e@il parietal, de l’épiphyse chez les 
Lacertiliens. 
13. Gace, 8S. P.—The Brain of Diemyctylus Viridescens. Wilder Quart. Cent. 
Book, 1898. 
14. Gaupp, E.—Zirbel, Parietalorgan und Paraphysis. Ergebn. Anat. Entwick.- 
Ges., VII, 208-285. 
15. Herrick, C. L.—Topography and Histology of the Brain of certain Rep- 
tiles. Journ. of Comp. Neurology, Vol. I, 37; Vol. III, 77-104, 119-138. 
Topography and Histology of certain Ganoid Fishes. Journ. of 
Comp. Neurology, Vol. I, 162. 
16. 
