ENDOSKELETON AND VOLUNTARY MUSCLE 



55 



dicular skeleton, made up of the skeleton of the limb girdles and 

 the skeleton of the paired appendages, such as the paired fins of 

 fishes or the arms and legs of terrestrial forms. Ribs and the 



pre max if ferry 

 nasal 

 maxillary 

 -fronfo -parietal 



pterygoid 



angu/otre 

 Squamosal 



quadrato-jugal 

 exoccipjfal 



auditory capsule 

 transverse process 



sacrum 



urostyte 



Fig. 30. — Axial skeleton of Rana catesbeiana, dorsal view. 



skeleton of unpaired fins if present belong to the axial skeleton. 

 The sternum or breast bone seems to be a development of the 

 anterior limb girdle and therefore a part of the appendicular 

 skeleton. 



