196 BULLETIN 160, UNITED STATES NATIONAL MUSEUM 



Pmx, 



Max 



Q.J.-1 



Figure 22.— Diagrammatic dorsal view of skull of Rana catesbeiana: C, 

 condyle; Ex. oc, exoccipital; Fr., frontoparietal; Max., maxillary; Na., 

 nasal; Pmx., premaxillary; Pr., prootic; Pt., pterygoid; Q. J., quadra- 

 tojugal; S., sphenethmoid; Sg., squamosal 



Pmx. 



Figure 23 .—Diagrammatic ventral view of skull of Rana catesbeiana: Ex. oc, 

 exoccipital; Fr., frontoparietal; Max., maxillary; Pa., parasphenoid; Pal., 

 palatine; Pmx., premaxillary; Pr., prootic; Pt., pterygoid; Q., quadrate car- 

 tilage; Q. J., quadratojugal; S., sphenethmoid; Sg., squamosal; Vo., vomer 



