The following amazing illustrations are plate details from Molluscs and Shells (1852-1856) by Augustus Addison Gould.

Octopus ornatus

Octopus ornatus

Octopus mimus

Octopus mimus

Octopus megalocyathus

Octopus megalocyathus

Onychoteuthis rutilus

Onychoteuthis rutilus

Sighted by Chris (via BibliOdyssey)

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