MIDBRAIN AND THALAMUS OF NECTURUS 



335 



Fig. 47 Detail of the region laterally of the tuberculum posterius and fovea 

 isthmi of the left side, from the next section ventrally of figure 46, to illustrate 

 the mode of ending of the fibers of the supposed tractus mamillo-peduncularis 

 (tr.mam.ped.). Some of these fibers decussate in the ventral commissure both 

 before and behind the fovea isthmi (J.-i.). X 74 (cviic, 26). 



