Ermine Cowles Case's groundbreaking study of the skull of the Pelycosaurian genus Dimetrodon is a landmark in vertebrate paleontology. Based on careful examination of fossils and observation of living species, Case's analysis sheds new light on the evolution of this early reptile. Anyone interested in the history of science, or in paleontology in particular, will find this work to be a fascinating read. This work has been selected by scholars...