Studies On Apus, Limulus And Scorpio is a scientific book written by Edwin Ray Lankester and published in 1881. The book focuses on the anatomy, physiology, and behavior of three different arthropods: Apus, Limulus, and Scorpio. The first section of the book is dedicated to Apus, a genus of freshwater crustaceans commonly known as fairy shrimp. Lankester provides a detailed description of the external and internal anatomy of Apus, including its nervous...