246 OIRCULATION 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 , , Vessels of the gills 
Arterial bulb __ 
Ventricle . 
Auricle --~ -___ 
Venous sinus --.... hi fH \\___. Dorsal artery 
Vena porte, liver, &e. ---- /-44 
Intestine ---* 
be f- Dorsal artery or aorta 
Venacava ----4 
Fig. 135.—Crrcunatine APPARATUS oF Fist. 
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 
