In 'North American Plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus', Samuel Wendell Williston provides a comprehensive examination of these prehistoric marine reptiles. The book not only delves into the physical characteristics and behaviors of the plesiosaurs but also explores their ecological significance and evolutionary history. Williston's writing style is scholarly yet accessible, making this book a valuable resource for both paleontologists and enthusiasts alike. The inclusion of detailed illustrations and diagrams further enhances the reader's understanding of these fascinating creatures within their geological context. This book is a must-read for anyone interested in the study of ancient marine life. Samuel Wendell Williston's expertise in paleontology shines through in his meticulous research and analysis of North American plesiosaurs. His passion for the subject is evident in the depth of information provided, making this book a significant contribution to the field. Recommended for both professionals and amateurs, 'North American Plesiosaurs' offers a thorough examination of these remarkable animals.