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Fig. 1. The circulatory system of S. officinalis viewed from below (modified from Schipp, 1987b). White rectangles indicate planes along which ultrasound images were taken. See Materials and methods for organs transected in each numbered plane. Stippled vessels carry deoxygenated blood; dark vessels carry oxygenated blood. ABV, afferent branchial vessel; AMV, anterior mantle vein; AU, auricle; AVC, anterior vena cava (Point A, near the opening of the mantle; Point B, near the opening of the anus); BH, branchial heart; BP, branch point; CA, cephalic aorta; EBV, efferent branchial vessel; LVC, lateral venae cavae; PMV, posterior mantle vein; PAO, posterior aorta; V, ventricle.