File:EB1911-Gastropoda 30.png

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EB1911-Gastropoda_30.png ‎(379 × 343 pixels, file size: 56 KB, MIME type: image/png)

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Description
English: Valvata cristata, Müll.

o, Mouth.

op, Operculum.

br, Ctenidium (branchial plume).

x, Filiform appendage (? rudimentary ctenidium).

The freely projecting ctenidium of typical form not having its axis fused to the roof of the branchial chamber is the notable character of this genus.
Date
Source Encyclopædia Britannica Eleventh Edition, Vol. 11 "Gastropoda".
Author Encyclopædia Britannica

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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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current03:50, 15 March 2015Thumbnail for version as of 03:50, 15 March 2015379 × 343 (56 KB)Animalparty (talk | contribs)User created page with UploadWizard

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