ClipArt ETC
"Diagram showing the heart and general course of the circulation in the lamellibranchs. Only a short section is shown. a, auricle (right), with slit to ventricle; b, the body (region of spaces, lacunae, capillaries; v, the ventricle from which arteries pass forward and their capillaries; m, the mantle and capillaries; v, ventricle from which arteries pass forward and backward; v.c., "vena cava," in which the blood collects on returning from the tissues of the body." -Galloway, 1915

Bivalve Circulation

"Diagram showing the heart and general course of the circulation in the lamellibranchs. Only a short…