Fir,. 315. Skeleton of frog. The half of the pectoral girdle, and 

 foie- and hind- limb of the right side are not shown. 



pinx., premaxilla ; -mx.^ maxilla; ., nasal ; spk., sphenethmoid ; 

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

 quadrato-jugal ; sg., squamosal ; (?., quadrate ; c., columella 

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

 /"., urostyle ; S.sc., supra scapula ; H., humerus ; R.U., radio 

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

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

 gal us ; ., calcar ; Mt.^ metatarsals. 



