edited by me.
Plate from Ernst Haeckel's Kunstformen der Natur (Artforms of nature) (1904). The author died in 1919, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 95 years or less. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.