Piece of sponge (1764–8) by Martin Frobenius Ledermüller, from Mikroskopische Gemüths- und Augen-Ergötzung.

Source: Smithsonian Libraries and Archives / Biodiversity Heritage Library

https://pdimagearchive.org/images/02d31ba1-1653-4915-a7d9-f84021d91e4b

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