Supplement to the catalogue of seals and whales in the British Museum

"Supplement to the Catalogue of Seals and Whales in the British Museum" by John Edward Gray is a scientific document that builds upon the British Museum's existing collection of information about seals and whales. It closely examines different types of these marine mammals, sorting them into categories and describing how their bodies are built. The publication begins with the seal family, dividing it into those with and without visible ears, and then carefully explains anatomical details like the shape of their skulls, the kind of fur they have, and where they live in the world. It is rich with specifics like the different forms of skull structure—a key to telling types apart—and also references the research of others who studied these animals, showing Gray's dedication to recording all that was known about seals and whales as science and the study of nature was becoming more popular.