Originally published in 1976, the object of this volume was to present a relatively up-to-date overview of what was known, what was suspected, and what remained to be discovered concerning the general question of the evolution of the vertebrate brain and behaviour, and to present a list of references for those who wanted to delve deeper into one or another aspect of the problem. Accordingly, it contains chapters by palaeontologists, sensory morphologists and physiologists, comparative neurologists and comparative psychologists. The chapters are arranged in a sequence loosely approximating the order in which the various animals, brain structures, or behaviour first appeared. Therefore, the chapters fall naturally into sections, each section directed to a group of vertebrates, beginning with those which have very remote common ancestry and progressing to those with more recent common ancestry with mankind.