lln 

 tions, between ^hich thera are neurones ani supporting elenoents. 

 The tractus olfacto-habenularis (Section Vin,l,c) teminates 

 here, and the neurones of the nucleus give origin to the trac- 

 tus habenulo-peduncularis, (the bundle of Meyaert, and the fas- 

 cicaltis retporeflexus, of authors). 



A representative neurone is shown in Fig. 85. The size of 

 the entire element is rather large. The cell-body tends to 

 retain a rounded form, although diverted from this condition 

 more or less by the thickened bases of the dendrites. The 

 dendrites are some three or four in number, gnarled and irreg- 

 ular processes, branching only a few times, and extending far 

 outward in every direction from their points of origin. The 

 surface of a dendrite is roughened by nodal thickenings, knobs, 

 and a few gemmules. The axone arises directly from the cell- 

 body in all of the instances observed. Its course is tracea- 

 ble for only a short distance in a transverse section, since 

 it soon turns posteriorly into the tractus habenulo-peduncula- 

 ris. This important tract takes the usual course toward the 

 base of the miibrain. Its termination occurs there in the 

 nucleus interpeduncularis. The significance of the tract is to 

 be interpreted as a part of the olfacto-motor complex, discussed 

 nore particularly in Section VIII. 



5. Eli DO thalamus: The Lobl Infer iorea. 

 The hypothalamus is very large in \(ustelus, projecting 



