What is the difference between the amphibian heart and the reptile heart?

The reptiles have double and incomplete circulation too, three heart chambers (two atria and one ventricle).

The reptile heart however presents the beginning of a ventricular septation that partially separates a right and left region of the chamber.

With the partial ventricular septation the mixture of arterial with venous blood in the reptile heart is less than in amphibians.