This is Marsh's seminal work on the Dinocerata, an extinct order of herbivorous mammals that lived from the Paleocene to the Eocene epoch. In this monograph, Marsh describes the anatomy, physiology, and evolution of these giant beasts, which had massive jaws and a rhinoceros-like body. This book is a must-read for paleontologists, zoologists, and anyone interested in the history of mammals on earth. This work has been selected by scholars...