Carapace of a turtle shell.
Unknown author<span style="display: none;">Unknown author</span>. The author of the image is not given in the book, although it might be the author of the text entry <a href="https://cs.wikipedia.org/wiki/s:Autor:Franti%C5%A1ek_Bayer_(1854%E2%80%931936)" class="extiw" title="cs:s:Autor:František Bayer (1854–1936)">František Bayer</a>.
"Želvy." Ottův Slovník Naučný. Vol. 27. Praha: J. Otto, 1908. 798–802. Print