518 



E. TULLE Y NEWTON ON THE REMAINS OF 



Hypothetical restoration of the skull of Portheus gaultinus 

 (see PI. XXII. figs. 1, 2, & 4). 



sp.of."; 



bs. Upper portion of basi sphenoid. 



as. Alisphenoid. pa. Parietal region, ps. Presphenoid. 



fr. Frontal, sp.ot. Sphenotic (postfrontal). pr.ot. Prootic. 



op.ot. Opisthotic or exoccipital. ob. Supraorbital. 



pmx. Praemaxilla. mx. Maxilla, ju. Jugal. pi. Palatine. 



pr.fr. Prefrontal, eth. Ethmoid, olf. Perforation for olfactory nerve. 



