The Ornithosauria is a book written by Harry Govier Seeley in 1870. The book is an elementary study of the bones of pterodactyls, which are ancient flying reptiles. The study is based on fossil remains found in the Cambridge Upper Greensand, an area in the United Kingdom known for its rich fossil deposits. The book provides a comprehensive overview of the anatomy and structure of the bones of pterodactyls, including their wings, legs, and skulls...