844 



MU. P. E. BEDDABD Olf THE 



[Dec. 3, 



moreover, ends on the fibrous aponeurosis already spoken of as 

 lying behind the lung. 



(3) As iu Ra)ia and Pi'pa, the sterno-hyoid muscle bifurcates 

 below the sternum into an anterior and posterior section. In 

 Xetiopus the posterior branch is a rather thin and narrow muscle 

 which passes down at the level of the anterior end of the heart 



Fig. 3. 





Thigh-muscles of Xenopus. 



Sa., sartorius : >Sif., seruitendinosus ; It.i.mag., rectus intemus major ; 

 B.i.min., rectus internus minor. 



at right angles to the sternum. The muscle is attached to the 

 outer side of the wall of the sac which encloses the heart and 

 ■pericardium, and is therefore posterior to all the great vessels which 

 enter and leave the heart. Its fibres, which do not fan out to 



