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“Diagram to show the way in which an outgrowing gill-process bearing blood-holding lamellae, may give rise, if the sternal body wall sings inwards, to a lung-chamber with air-holding lamellae. I is the embryonic condition. L is the condition of outgrowth with gl, gill lamellae. A is the condition of insinging of the sternal surface and consequent enclosure of the lamelligerous surface of the appendage in a chamber with narrow orifice—the pulmonary air-holding chamber. pl, Pulmonary lamellae. bs, Blood sinus.” — The Encyclopedia Britannica, 1910


Fish Anatomy


The Encyclopedia Britannica, Eleventh Edition (New York: The Encyclopedia Britannica Company, 1910)II:293


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