File:1911 Britannica-Arachnida-Kingsley.png

1911_Britannica-Arachnida-Kingsley.png(282 × 419 pixels, file size: 67 KB, MIME type: image/png)

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Description
English: Diagram to show the way in which an outgrowing gill-process bearing blood-holding lamellae, may give rise, if the sternal body wall sinks inwards, to a lung-chamber with air-holding lamellae.
I is the embryonic condition.
bs, Blood sinus.
L is the condition of outgrowth with gl, gill lamellae.
A is the condition of in-sinking 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.
(After Kingsley.)
Date
Source Encyclopædia Britannica Eleventh Edition, Vol. 2, Page 293
Author Encyclopædia Britannica, 1911

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Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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