434 



J. B. JOHNSTON 



sen 



't 



cpo 



Fig. 15 Section at about the level where the sulcus limitans bends down- 

 ward and is less conspicuous in transverse sections. It is marked by a broken 

 line on the left and on the right by a small cross. 



Fig. 16 A section taken just at the rostral border of the superior recess. The 

 section is magnified 28 diameters. The anterior pallial commissure rises at 

 either side in the hippocampal primordium. The two dense nuclei of small cells 

 near the middle line are in the rostral wall of the superior recess and correspond 

 in part to the nodulus marginalis of the bat and rodents. A part of this nucleus 

 is represented also by the small-celled nucleus adjacent to the hippocampal com- 

 missure (e.g., in figs. 46 and 64). c. s., recessus superior. 



