PLATE XXXI. 



Figs. 25, 26. — Mesopterygoid, outer and inner views. 



Figs. 27, 28. — Metapteiygoid, outer and inner views. 



Figs. 29, 30, 31. — Epiotic— inner, dorsal and posterior views. 



Figs. 32, 33, 34. — Exoccipital — outer, posterior and inner views. 



Fig. 35. — Frontal, lateral view. Natural size. 



