58 



ZOOLOGY. 



Smaller rin-nlntii.n. 



Venae Cavse. 



Heart. 



Aorta. 



' Single Ventricle. 



Greater Circulation. 

 Fig. 39.-Keptiles. 



Smaller Circulation. 

 Ventricle. | 



Auricle. 



Veins. 



Heart. 



- Dorsal Art err. 



Greater Circulation. 

 K>. Fishes. 



THEORETIC FIGUBE8 OF THB CIBCCL1TION. 



