EXPLANATION OF PLATES. 



e, ethmoid. 

 eo, exoccipital. 

 ep, epiotic. 

 fr, frontal, 

 n, nasal. 

 op, opisthotic. 

 p, parietal, 

 p/, prefrontal. 

 pt, pterygoid. 

 soc, superoccipital. 

 S'p, sphenotic. 

 V, vomer. 



