246 



CIECULATION IN FISHES. 



auricle and a ventricle. It is placed at the origin of the 

 vessels which are concerned in the aeration of the blood ; and 



Branchial artery 



Arterial bulb , 





Ventricle -^ 



Auricle 



Venous sinus 



Vena portae, liver, &c. 



Intestine 



Venacava 



Vessels of the gills 



, Dorsal artery 



.. Kidneys 



. Dorsal artery or aorta 



Fig. 135. CIRCULATING APPARATUS OF FISH. 



it receives and transmits venous blood only; hence it is 

 analogous to the right side, or respiratory heart, of Birds and 

 Mammalia. The venous blood, which is brought to it by the 



