Primitive Motile Systems in Cell Biology is a collection of papers presented at the Symposium on the Mechanism of Cytoplasmic Streaming, Cell Movement, and the Saltatory Motion of Subcellular Particles, held at Princeton University in April 1963. The participants in the symposium represent various fields of science, brought together to consider how movement occurs at the cell level and below. This volume is organized into four sections encompassing 36 chapters and begins with an overview of cytoplasmic streaming in plants and Myxomycetes (Mycetozoa), including topics ranging from the organization of movement in slime mold Plasmodia to the mechanochemical system behind streaming in Physarum. The next section discusses cytoplasmic streaming and locomotion in the free-living amoeba, with chapters exploring relative motion in Amoeba proteus and mechanisms of amoeboid movement based on dynamic organization. This volume also discusses cytoplasmic streaming, locomotion, and behavior of specialized amoeboid cells. The book concludes with an analysis of non-Brownian and saltatory motion of subcellular particles, along with mitotic movements. This book is intended for scientists and students of the biological, biophysical, and medical sciences who are interested in the movements in and of living cells.