COURSE OF THE BLOOD IN ANIMALS. 



63 



Smaller Circulation. 

 Ventricle. | 



Auricle. 



Veins. 



Fig. 49. Fishes. 



- Heart. 



-, Dorsal Artery. 



Greater Circulation. 





 Smaller Circulation. 



Fig. 50. Crustacea.* 



Branchio-Cardiac 

 Canals. 



Heart. 



Arteries. 



Greater Circulation. 



* In all these figures the shaded parts represent the veins ; the parts 

 simply traced represent the arteries ; the dotted circle represents the heart. 

 Finally, the arrows point out the direction of the sanguine current, which 

 is the same in all the figures. 



