@misc{indiciaeff9e52ce13ad,
  title = {Principles of comparative physiology / Principles of comparative physiology. : [Supplementary material in Charles Darwin's copy] — Illustration, Page 513},
  year = {1854},
  url = {https://www.biodiversitylibrary.org/page/34068373},
  note = {Source identifier: page-34068373}
}