TI1E SKELETON OF TIIE FROG 



41 



FIG. 7. The skeleton of the frog, seen from the dorsil surface ; the 

 left suprascapular and scapular have been removed. 



a, astragalus ; c, calcaneum ; d, suprascapular ; e, exoccipital ; 

 /, femur ; fp, front oparieial ; g, metacarpals ; A, humerus ; i, ilium ; k, 

 metatarsals ; /, carpus; m, maxilla; n, nasal; o, pro-otic; /, pterygoid; 

 pm, premaxilla ; q, "quadratojugal " ; r, radio-ulna; s, squamosal; 

 it, sphenelhmoid ; s.v, sacral vertebra; /, tibio-fibula; u, urostyle. 



