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The foremost section, which is turned towards the ventral side, and from which the aortic arches rise, reproduces the arterial bulb of the Selachii. The heart of the human embryo is now a complete fish-heart. Transverse section of the back of the head of a chick-embryo, forty hours old.
Ernst Heinrich Philipp August Haeckel - The Evolution of Man — Volume 2
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