Lessons on Shells, London, R. B. Seeley, W. Burnside, 1838., This illustration features a collection of various shell specimens arranged in a grid format. The shells exhibit a range of shapes and textures, including smooth, elongated forms and more intricate designs marked by patterns and ridges. Each shell is labeled with a letter, indicating specific species or classifications. The arrangement highlights the diversity of marine life, showcasing the natural beauty and complexity of these molluscan shells.