Fig. 77 Bear, section through the genu showing that the indusium as it 

 curves beneath the genu develops a complete, though small, hippocampal for- 

 mation with all the typical parts present. Compare figures 29, 43 and 58. 



Fig. 78 Fig embryo, 23 mm. Medial surface of the right half of the head. 

 The lamina terminalis contains the anterior commissure. The lamina supra- 

 neuroporica is only slightly thickened. Between it and the velum transversum 

 is the paraphysal arch, the angulus terminalis of His. 



470 



