Radiological Observations on the Cardiovascular System in Anguilla Anguilla

Abstract

1. A description is given of an angiographic method for studying the circulation of blood in the anaesthetized common eel. 2. The valves of the heart are concluded to be competent. 3. The extreme elasticity of the bulbus arteriosus is noted, especially of its anterior end. 4. The circulation time through the gills was 5.6 ±1.9 sec. 5. The circulation in the head is relatively inconspicuous; all the emphasis is on the backward flow of blood from the gills. 6. The circulation times to the viscera are very variable. 7. It appears that the two alternative routes of venous return from the pneumatic duct artery, which are the pneumatic duct vein and the gas gland vein, may both be operating together or either may operate alone.