This is a vintage illustration of a coral formation. The coral is depicted in a detailed, almost stippled style, using a range of brown and beige tones. It appears to be a dense colony of individual polyps, each with a small, circular opening. The coral is roughly rectangular in shape, with a textured surface. The illustration is on a cream-colored page, and there is a number '293' in the upper right corner. At the bottom, there's text indicating it was published by J. Sowerby in London.