1910.] 



ANATOMY OF HIPPOPOTAMUS AMPHIBIUS. 



shown on the left of the drawing with the same letters attached 

 to the corresponding parts. It will be noticed that this, the 

 anterior or great papillary muscle, arises very near to the junction 

 between the free and the septal wall of the ventricle. The septal 

 half of the auriculo -ventricular valve arises from or is connected 

 with two perfectly distinct papillary muscles, of which the left- 



Text-fig. 23. 



Interior of right ventricle of Hippopotamus. 

 AA 3 BB. Attachments of great papillary muscle. 



hand one (that to the right in the figure) is the larger. From the 

 cut edge " A " to the left of the figure a muscle passing upwards 

 is seen. This I regard as the moderator band. An interesting 

 feature of this heart consists in the presence of chordae ten- 

 dinese, which run parallel with the margin of the auriculo- 

 Proc. Zool. Soc— 1910, No. XV. 15 



