1910.] 



ANATOMY OV HIPPOPOTAMUS AMPHIBIUS. 



227 



distinctly smaller than the precaval. In the Hippopotamus' 

 heart the postcaval had unfortunately been cut away very close 

 to the heart; but it must, I imagine, be limited to the area 



Text-fig. 24. 



a 



LAC, 



%f 



Interior of right auricle of Hippopotamus. 



a. Orifice of tributary of azygos (Az.). A.C. Anterior vena cava. B. Deep recess. 



b.v. Orifice of small blood-vessel. C. Coronary vein. P.O. Postcaval vein. 

 x. Probe passed through auriculo-ventricular orifice. 



marked P.O. in text-fig. 24. This corresponds with the position 

 of the same vein in the Peccary. If this be so, the vein is actually 



15* 



