Ml 



Ca 



Is 



FIG. 274. Skeleton of frog. The half of the pectoral girdle, and 

 fore and hind limb of the right side are not shown. 



PJII.V., premaxilla ; /.\-., maxilla; ;/., nasal; sph., sphenethmoid ; 

 p.f., parieto-frontal ; P.O., pro-otic; pt., pterygoid ; q.j., 

 quadrato-jugal ; sq., squamosal ; Q., quadrate; c., columella 

 auris ; A., atlas ; t.p., transverse process ; S.V., sacral-vertebra ; 

 U., urostyle ; S.sc., supra scapula ; //., humerus ; fi. U., radio- 

 ulna ; Cp., carpals ; Me., metacarpals ; //., ilium ; Is., ischium ; 

 F., femur; T.F., tibio-fibula ; Ca., calcaneum ; As., astragalus; 

 C., calcar ; Mt., metatarsals. 



