More details about the artwork:
The 42nd plate from Ernst Haeckel's ''Kunstformen der Natur'' (1904), depicting organisms classified as Ostraciontes.
Note: Ostraciidae is a family of squared, bony fish belonging to the order Tetraodontiformes, closely related to the pufferfishes and filefishes. Fish in the family are known variously as boxfishes, cofferfishes, cowfishes and trunkfishes.
Ernst Heinrich Philipp August Haeckel (February 16, 1834 – 1919) was a philosopher, professor, physician, naturalist, biologist and artist who discovered, described and named thousands of new species.