Circulatory System of an Annelid Small 77×320 Medium 154×640 Large 247×1024 Download Tiff Original 578×2400 | (194.2 KB) Description Anterior part of the circulatory system of an annelid. The arrows indicate the direction of the flow. H, heart-like enlargement of the commissural vessel. Keywords annelid, worm Galleries Worms Source: Beach, Fredrick Converse The Encyclopedia Americana (New York, NY: The Americana Company, 1903)
