204 The Alligator and Its Allies 
of the right subclavian will also be described in 
connection with the arterial system. 
The auricles are very large in proportion to the 
Fic. 59. The veins of the posterior region of the Florida 
alligator. The postcaval system and its associated veins are 
shown in the main figure; the hepatic portal system is shown in 
the smaller figure to the left.—For lettering, see pages 224-25. 
ventricles, though their relative sizes will, of course, 
vary with the amount of contained blood. 
THE VENOUS SYSTEM 
The Posterior Vena Cava and its Branches. The 
postcava, Fig. 59, pc, as noted above, is a wide, 
