Figure 1 in Studies on spider respiration and circulation by Victor Willem

Figure 1. Araneus diadematus. Sagittal view showing the heart, pericardium, and main branches of the anterior aorta. G, female genital opening; p, base of the posterior leg; N, nerve mass; k, right chelicera; o, eyes; g, venom gland; 1-11, epicardial ligaments; c, commissural ligaments; h, hypogastric ligament; a, three lateral arteries; ap, posterior artery.