Image: Physa gyrina eggs
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Description: drawing of eggs of Physa gyrina: upper image is egg-mass showing position of eggs in envelope. Lower images is enlarged single egg showing position of an embryo.
Title: Physa gyrina eggs
Credit: Frank Collins Baker: Shells of land and water; a familiar introduction to the study of the mollusks. (1903), Chicago, A.W. Mumford, page 36. (Exported from the file at https://archive.org/details/shellsoflandwate1903bake from the page 66 of the PDF file in 600 dpi/inch and a bit retouched by User:Snek01.)
Author: Frank Collins Baker (1867-1942)
Permission: public domain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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