Plate IV. 



Skull of Dolichorhynchops osborni. X i/3« 



Fig. i, from above. 



Fig. 2, from below. 



bo, occipital condyle; en, external nares; ep, ectopterygoid; /, frontal; in, 

 internal nares (the letters are on the anterior end of the palatine); /, jugal, mx, 

 maxilla; pa, parietal; pf, prefrontal; pm, premaxilla; pt, pterygoid; pof, post- 

 orbital; q, quadrate; qj, quadratojugal; sq, squamosal 



