j , A PPE N DIX. 



from these points the fibres extend in a prevailing direction forwards, over the 

 anterior quarter shell towards its periphery, and then, arching around the 

 viscera, are inserted into the central tendon. At the line where the muscle leaves 

 the shell it receives additional fibres. The posterior bell) arises from the sixth, 

 fifth, and fourth intercostal spaces, and from the vertebral margin of the third space 

 (overlying the fibres of the anterior belly that come from this space), and stretches 

 ,^ er the posterior quarter circle of the shell, to be inserted into the common tendon. 

 It receives reinforcements of fibres where it leaves the shell to inclose the viscera, 

 as docs the anterior belly. 



PUBLISHED BY THE SMITHSONIAN INSTITUTION, 

 WASHINGTON, I>- C. 



a r k 1 1. . 1 





