No. 5.] HABENULAR TRACTS OF ACIPENSER. 



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nuclei postolfactorii (and cortex ?) and run in front of and 

 above the anterior commissure. It is probable that this portion 

 includes Edinger's tractus cortico-habenularis. The bundles 

 in Acipenser from the nuclei postolfactorii do not seem to be 

 represented in Edinger's scheme. 



(4) The bundles of Meynert arise from cells in the ganglia 



FIG. 5. Frontal section through region of Corpus interpedunculare, showing decussation of Mey- 

 nert's bundles. M.b., Meynert's bundles ; ///, Nervus oculomotorius ; Com. ans., Commis- 

 sura ansiformis ; v. , cavity of mid-brain. Camera drawing. 



habenulae as described by Van Gehuchten ('94) in the trout, 

 traverse the walls of the 'tween-brain to the region of the corpus 

 interpedunculare in the base of the mid-brain, thence, after 

 decussation of most of the fibers, pass back toward the medulla. 

 Other habenular tracts will be described in my final paper. 



