File:EB1911-Gastropoda 8.png

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English: A, Section in a plane vertical to the surface of the neck of Patella through a, the rudimentary ctenidium (Lankester’s organ), and b, the olfactory epithelium (osphradium); c, the olfactory (osphradial) ganglion. (After Spengel.) B, Surface view of a rudimentary ctenidium of Patella excised and viewed as a transparent object. (Lankester.)
Date
Source Encyclopædia Britannica Eleventh Edition, Vol. 11, Page 508
Author Encyclopædia Britannica
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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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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