Egg of <i><a href="//commons.wikimedia.org/wiki/Crex_crex" title="Crex crex">Crex crex</a></i>
Henry Seebohm (1832-1895)
Seebohm, Henry (1896) <i>Coloured Figures of the Eggs of British Birds</i> Sheffield, Pawlson &amp; Brailsford  plate 22 (posthumous publication)