This unique volume investigates the relationships of primates at the ordinal and higher classificatory levels from a variety of interdisciplinary viewpoints. Individual chapters examine the origin and evolution of gliding in early Cenozoic Dermoptera, the ontogeny of the tympanic floor in Archontans, the role of the neurosciences in primate evolutionary biology, and many other subjects. The work will be of particular interest to primatologists, zoologists, and systematists.