""Studies on Apus, Limulus and Scorpio"" is a scientific book written by Edwin Ray Lankester and published in 1881. The book is a collection of research studies on three different types of arthropods: Apus, Limulus, and Scorpio. The first section of the book focuses on Apus, a genus of freshwater crustaceans commonly known as fairy shrimp. Lankester's studies explore the anatomy, physiology, and behavior of these fascinating creatures, providing a...