PLATE 9 
EXPLANATION OF FIGURES 
20 Stage 6. Transverse section (309) through posterior edge of fenestra 
hypophyseos, X 30. Note unusual relation of nerve VI to basal plate on left 
side of figure. 
21 Stage 5. Transverse section (215) through roots of basipterygoid proc- 
esses and trabeculae and through foot of epipterygoid, X 25. 
236 
