The goals of this volume are twofold. First, it aims to provide a novel focus on adaptive explanations for cranial and postcranial features and functional complexes, socioecological systems, life history patterns, etc. in early primates. Second, it aims to offer a detailed rendering of the phylogenetic affinities of such basal taxa to later primate clades as well as to other early/recent mammalian orders. Thus, in addition to the strictly paleontological or systemic questions regarding Primate Origins, the editors plan to concentrate on the adaptive significance of primate characteristics. These questions are best approached through both paleontological and neontological comparative research on a variety of primate and non-primate materials.