GENERAL CHARACTERS OP REPTILES. 539 



an aquatic, afterwards an aerial respiration. There are even 



Arches of A< 



Super, vena cava 



/arotid artery 



y xArches of aorta 



,.<'* ^Right auricle 



Ventricle 



*"" -Pulmonary vein 



, Brachial artery 



Pulmonary artery 



Pulmonary artery- f^ 

 Inferior vena cava 



Venaporta? 



Intestines 



FIG. 314. CIRCULATING APPARATUS OF LIZARD. 



some which retain their organs during the whole of life, and 

 which, having at the same time lungs, are completely amphibious ; 



N N 2 



