416 THE TORUS LONGITUDINALIS OF THE TELEOST BRAIN. 



Fig. 20. Salvelinus fontinalis, adult. Parasagittal section through the mesencephalon; cutting the right lobe of 



the torus longitudinalis. The anterior end is toward the left. X 10. 

 Fig. 21. Morone americana, adult. Section as in Figure 20. X 10. 

 Fig. 22. Gasterosteus bispinosus, adult. Section as in Figure 20. X30. 

 Fig. 23. Notropis cornutus, adult. Section as in Figure 20. X30. 

 Fig. 24. Tautogolabrus adspersus, adult. Parasagittal section through the anterior portion of the roof of the 



mesencephalon and left lobe of the torus longitudinalis. The anterior end is toward the right. The 



details of this and the next figure are filled in diagrammatically. X50. 

 Fig. 25. Tautogolabrus adspersus, adult. Transverse section through the anterior portion of the mesencephalon; 



torus longitudinalis, and posterior commissure. X50. 



