NEKVUS TERMINALIS: MAMMALS 31 



which runs parallel with the processes of the cell. The position 

 of this cell was well within the crevice between the olfactory bulb 

 and the cerebral hemisphere, on the wall of a blood-vessel which 

 passes between the bulb and the hemisphere. The processes of 

 the cell were stained rather lightly by the silver and it was not 

 possible to follow them far. Their course so far as visible was 

 parallel with the wa,ll of the artery. Two slender processes may 

 be seen to issue from the cell, in addition to the polar processes 

 of much larger size. Because of these slender offshoots the cell 

 should possibly be classed with those of multipolar type, but it 

 is included with the bipolar cells because of its greater similarity 

 in other respects. 



In figure 8A is shown a cell whose position was on the medial 

 surface of the olfactory bulb, posterior and ventral to the main 

 ganglion of the terminalis. The larger process (p.pr.) is directed 

 toward the ganglion, while the very slender process from the 

 opposite pole of the cell is turned in the general direction of the 

 central connection of the nerve with the brain, although the 

 group of three fibers of which it forms one, turns at right angles 

 to the principal axis of the terminalis plexus. This process 

 was followed for some distance, but it was lost in the plexus 

 centripetally. 



(c) Multipolar cells. The multipolar type of cell predomi- 

 nates in the ganglia. These cells vary in size from the relatively 

 small ones shown in figure 16, to the large cells drawn to the 

 same scale represented in figures 9, 11 and 17. The number of 

 processes varies. The cells illustrated in figures 12 and 13, 

 which were found on the main trunk of the nerve, show but three 

 processes. The majority of multipolar cells included in the 

 small ganglia have at least five offshoots. Typical examples of 

 such cells are shown in figures 11 and 16. The ax one could not 

 always be determined with certainty, but in the cells shown in 

 figures 11, 12, 14, and 15 the process marked ax. appeared to be 

 the axone. In each of these cases it was directed centripetally. 

 That which appeared to be the axone of the cell shown in figure 

 13 (ax.) was directed peripherally. This cell lay in the course 

 of the main trunk of the nerve. 



