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Fourteen specimens of the Herring gull (Larus argentatus) were dissected and diagrams of the arterial system were prepared. Little individual variability in the larger arteries were noted; the origin, course, and number of smaller arteries, however, showed noticeable variation. In the neck and thorax region, the following arteries were relatively constant in origin and course: the common carotid, internal carotid, subclavian, sternoclavicular, ascending oesophageal, axillary, internal mammary (inner), pectoral, syringeobronchial, cervical cutaneous, comes nervi vagi, and subscapular artery. Individual variability was noted in the vertebral, accessory sternoclavicular, thyroid, and accessory oesophageal artery. In other regions of the body, as in the neck and thorax, the smaller arteries exhibited great individual variations. Additional studies are needed to clarify the phylogenetic significance of the vascular system in birds.