1908.] 



ANATOMY OF A FROG. 



23 



arising from the surface of the deeper layer is very wide, and 

 disappears anteriorly beneath the shoulder-girdle, being inserted 

 dorsally upon the scapula. It would seem to correspond to the 

 portio omo-abdominalis of the obliquus externus of Rana, but is 

 clearly much more extensive. The direction of its fibres is on 



Text-fig. 5. 

 om.cibdy. 



ctbci. 





-J^.ccLi^. 



Ventral abdominal musculature of Brevicejps cut so as to display 

 diflferent laj'ers. 



hy.abd. Hyoabdominal. Ohl.inf. Obliquus internus. Oin.abd. Omoabdominal 

 shown below at origin and above near to insertion, the intervening portion 

 having been cut away. Pect.abd. Origin of pectoralis abdominalis. B.abd. 

 Rectus abdominis. 



the whole obliquely postero-anterior. It arises from near the 

 edge of the underlying sheet of muscle also just referred to. 



