PLATE IV, 
Skull of Dolichorhynchops osborni. X1/3 
Fig. 1, from above. 
Fig. 2, from below. 
bo, occipital condyle; e”, external nares; ef, ectopterygoid; f frontal; z#, 
internal nares (the letters are on the anterior end of the palatine); 7, jugal, mx, 
maxilla; Za, parietal; Af prefrontal; fm, premaxilla; A¢, pterygoid; fof, post- 
orbital; g, quadrate; g7, quadratojugal; sg, squamosal 
