Illustration of Octopus, Gamochonia. Lithographer, Adolf Giltsch. Biologist, Ernst Haeckel, c.1899

The illustration shows five figures of cephalopods.
Figure 1 Chiroteuthis veranyi. Figure 2 Histioteuthis ruppelii. Figure 3 Pinnoctopus cordiformis. Figure 4 Octopus vulgaris. Figure 5 Octopus granulatus.

Originally from the book Kunstformen der natur by Ernst Haeckel (Leipzig, Wien, Bibliographische Institut, 1899-1904).