Assembled scans from original 19th century sources:
• Illustration by H. Holiday to The Hunting of the Snark, 1876
• Inlay: Print based on a drawing (1834-04-16) by Conrad Martens, etching published in: Francis Darwin, Life and Letters of Charles Darwin , p. 160, 1888. Conrad Martens' drawing has been engraved by T. Landseer and published in the year 1838 by H. Colburn in The Narrative of the Surveying Voyages of HMS Adventure and Beagle.