THE HEART AND ARTERIES OF POLYODON 



431 



Fig. 12 Dissection to show the coronary and subclavian arteries 



('05), but although the relationships of the subclavians are the 

 same the other arteries are not entirely comparable. In several 

 specimens the anastomosing vessel was apparently lacking. 



The branches from the coronary artery to the liver may arise 

 from both the right and left coronaries or from the larger one 

 alone (figs. 11, 12, a.he.a.). These vessels, which may be desig- 

 nated as anterior hepatic arteries, are distributed to the whole 

 anterior part of the liver. Their arrangement on entering the 

 liver is fairly constant, there being two arteries in relation to 

 each hepatic vein (fig. 13, a.he.a.). Within the liver they follow 

 the veins and ramify in the tissues till lost to macroscopic meth- 

 ods. In some, possibly all, cases they supply the gall bladder 

 (figs. 11, 13, gb.). In well injected specimens anastomoses are 

 easily traced between the anterior and posterior (a.he.p.) hepatic 

 arteries (fig. 13) but there is nothing to suggest that these are 

 more than secondary connections. The writer does not know 



