THE SKELETON OF THE FKOG 



41 



Fig. 7. — The skeleton of the frog, seen from the dorsal surface ; the 

 left suprascapular and scapular have been removed. 



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

 '', femur ; /j^, frontoparietal ; g, metacarpals ; A, humerus ; i, ilium ', k, 

 metatarsals ; /, carpus ; m, maxilla ; n, nasal ; 0, pro-otic ; p, pterygoid ; 

 fm, premaxilla; q, " quadratojugal " ; ?•, radio-ulna; s, squamosal; 

 se, sphenethmoid ; s.v, sacral vertebra ; t, tibio-fibula ; u, urostyle. 



