Kingsbury, Encephalic Evaginatio7is in Ganoids. 43 



as in Amia. Acipenser (Kupffer, Epiphysis I) and Polyodon 

 (Studnicka, '96) both possess it as doubtless do other Ganoids. 

 In cephalo-caudal succession we find then, on the mesal 

 section of this region of the brain of Amia, the mesal fold of 

 the prosotela, the paraphysis, the velum, the dorsal sack envel- 

 oping epiphyses I and II, the supracommissure and then the 

 epiphysis (II). 



Summary. 



1. Epiphysis I (anterior epiphysial vesicle) persists in 

 adult Amia and has a strong fiber connection with the left 

 habena. 



2. The cavity caudad of the velum possesses in Amia and 

 Lcpidostciis lateral extensions which extend cephalad and caudad 

 for a considerable distance. 



3. The paraphysis is present in Anna and Lepidosteus and 

 seems a distinct structure. 



LITERATURE CITED. 

 '91. Beraneck, E. Sur le nerf parietal et la morphologic du troisieme ceil 



des Vertebrates. Anat. Am. Vol. VII, pp. 678-689. 

 '96. Francotte, p. Contribution a I'etude de I'oeil parietal de I'epiphyse et 



de la paraphyse chez les Lacerti liens. Memoires couronnes et Memoires 



des savants strangers. Brussels, Vol. LV, 1896. 

 '93. Gage, Susanna P. The brain of Diemyciylus viridescens, from larval to 



adult life, and comparisons with the brain of Amia and Petromyzon. 



Wilder Quatter-Ccntury Book, Ithaca, N. Y., 1893, PP- 259 313. 

 '88. GoRONOwiTSCH, N. Das Gehirn und die Cranialnerven von Acipenser 



ruthenus. Moi-ph. Jahrb. Vol. XIII, 1887-88, pp. 427-574. 

 '91. Herrick, C. L. Contributions to the comparative morphology of the 



central nervous system. III. Topography and histology of the brain 



of certain Ganoid fishes. Joif. Conip. Neur. Vol. I, pp. 149-182. 

 '94. HiLi,, Chas. The epiphysis of teleosts and Amia. Jour. Morph. Vol. 



IX, 1894, pp. 237-268. 

 '92. His, \V. Zur allgemeine Morphologic des Gehirns. Arch. f. Anatomie 



und Physiologie. Anat. Abth. 1892, pp. 346-383. 

 '94. Humphrey, O. D. On the brain of the snapping turtle (Chelydra ser- 

 pentina). Jour. Comp. Neur. Vol. IV, 1894, pp. 73-I16. 

 '92. Klinckowstrom, a. de Le premier developpement de I'oeil pineal 



I'epiphyse et le nerf parietal chez Iguana tuberculata. Anat. Anz. 



Vol. VIII, 1892-3, pp. 289-298. 

 '93. Kupffer, C von. Studien zur vergleichenden Entwicklungsgeschichte 



des Kopfes der Kranioten. I Heft. Die Enlwicklung des Kopfes 



von Acipenser^sturio an Medianschnitten untersucht. 



