In 1893, English marine biologist William Saville-Kent published his 550-page book, The Great Barrier Reef of Australia: Its Products and Potentialities. Accompanying the text are more than a dozen full-color illustrations of the plants and animals of the reef, drawn from Saville-Kent’s watercolors painted on location. You can peruse the entire book at the Internet Archive or the Biodiversity Heritage Library or take a look at the illustrations at The Marginalian (where prints are also available).