File:EB1911 Gastropoda - Patella vulgata section and ctenidium.jpg

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English: A, Section in a plane vertical to the surface of the neck of Patella vulgata through a, the rudimentary ctenidium (Lankester’s organ), and b, the olfactory epithelium (osphradium); c, the olfactory (osphradial) ganglion. B, Surface view of a rudimentary ctenidium of Patella excised and viewed as a transparent object.
Date published 1911
Source “Gastropoda,” Encyclopædia Britannica (11th ed.), v. 11, 1911, p. 508, fig. 8.
Author Spengel and Lankester.
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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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current19:51, 27 February 2019Thumbnail for version as of 19:51, 27 February 2019617 × 699 (116 KB)Bob Burkhardt (talk | contribs){{Information |description ={{en|1=A, Section in a plane vertical to the surface of the neck of ''Patella vulgata'' through ''a'', the rudimentary ctenidium (Lankester’s organ), and ''b'', the olfactory epithelium (osphradium); ''c'', the olfactory (osphradial) ganglion. B, Surface view of a rudimentary ctenidium of ''Patella'' excised and viewed as a transparent object.}} |date =published 1911 |source =“Gastropoda,” ''Encyclopædia Britannica'' (11th ed.), v. 11, 1911, p. 5...

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