170 Journal of Comparative Neurology 



Fig. 7. Perpendicular section of the epiphysis and associated parts in 

 Trutta fario. 



Fig. 8. Horizontal section of the epiphysis and plexus of Seaphirhynchus. 



PLATE XIV. 



Fig. 1. Horizontal section of the epiphysis of Lophins. 

 Fig. 2. Perpendicular section of the epiphysis and associated parts of the 

 cat-fish. 



Figs. 3-4. Transverse sections of the epiphysial vesicle of the cat-fish. 

 Figs. 3-6. Transverse sections of the epiphysis of Belone, 

 Figs. 7-8. Transverse sections of the epiphysis in Cyclcptus elongatus. 

 Fig. o. Horizontal section of the epiphysis and related parts of Blicca. 

 Figs. 10-11. Perpendicular sections of the epiphysis in Lucioperca. 



PLATE XV. 



Fig. 1. Perpendicular section of the roof of the diencephalon of Meno- 

 poma. 



Fig. 2. Horizontal section of the epiphysis and related parts of Menopoma. 



Figs. 3-8. Perpendicular sections of the roof of the diencephalon, — Fig. 

 3 of Amblystoma, Fig. 4 of a Salamander, Fig. 5 of the toad, Fig. 6 of the 

 tadpole, Fig. 7 of the frog, Fig. 8 of a small frog. 



PLATE XVI. 



Figs. 1-2. Perpendicular sections of the roof of the diencephalon, — Fig. 

 I of Bascanium constrictor, Fig. 2 of Ent&nia sirtalis. 



Fig. j. Transverse section of the epiphysis of Tropidonotus rhombifer . 



Fig. 4. Perpendicular section of the roof of the diencephalon of Aspi- 

 donectes spinifer. 



Fig. j". Perendicular section of the roof of the diencephalon of Sceloperns 

 striatum, showing the epiphysis, nerve, plexus, and parietal eye. 



PLATE XVII. 



Camera drawing of one half of the parietal eye Sceloperus striatum magni- 

 fied twelve hundred diameters. 



PLATE XVIII. 



Fig. 1-3. Transverse and perpendicular sections of the roof of the dien- 

 cephalon of the Alligator. 



Fig. 4. Perpendicular section of the roof of the diencephalon of the 

 Guinea pig. 



Fig. j. Horizontal section of the epiphysis of Chelydra. 



Fig. 6. Perpendicular section of the roof of the diencephalon of a mouse 

 embryo. 



Fig. 7. Perpendicular section of the roof of the diencephalon of Erethizon. 



CORRIGENDA. 



The word "mid-brain" on p. 14, second line from the bottom, p. 15, lines 

 5 and 6, and p. 16, line 7 from the bottom, should be diencephalon. 



