4 Pages in Charles Darwin's Library associated with "fauna - Gymnotus"

Elements of physiology
By: Müller, Johannes, - Baly, William,
Publication info: London, Taylor & Walton, 1838-1842
Volume: v.1
Pages: Page 65 Page 66
Principles of comparative physiology
By: Carpenter, William Benjamin,
Publication info: London, John Churchill, 1854
Pages: Page 470 Page 471