96 
ACTING PTERYGII. 
maxilla, deepened and very robust at the anterior palatine arti¬ 
culation, and its oral border very slightly sinuous, the feeble 
convexity in its middle third bearing the largest teeth. Depth of 
dentary at the symphysis equalling one third the total length of 
the mandibular ramus, and its oral border excavated in its middle 
Fig. 5. 
Portheiis gaultinus \ partial restoration of head by E. T. Newton, one half 
nat. size. 
as., alisphenoid; bs., upper portion of basisphenoid; etk., mesethmoid ; ./V,, 
frontal; hm., facette for hyomandibular ; ju., supramaxilla ; mx., maxilla; 
ob., supraorbital; foramen for olfactory nerve; op.ot., opisthotic; 
pa., parietal region ; pi., palatine; pmx., premaxilla ; pr.fr., prefrontal 
(ectethmoid) ; pr.ot., pro-otic; ps., orbitosphenoid (?) ; sp.ot., postfrontal 
(sphenotic). 
