Sargent. — <)i)li<: Hullex Apparatus. 



PLATK 11. 



Fig. 71. Haja erinaeea, 14 cm long. Diaijrammatic sagittal section of the mid- 

 brain, showing the ' Dachkurn ' and the fibre-tracts arising from it, and 

 tlu' metiiod of formation of Keissner's fibre. 



Fig. 72. Amia calva, advanced hirval stage. Sagittal section of tlie midbrain, 

 somewhat diagrammatic, siiowing tiie mode of formation of Keissner's 

 fibre. 



