Containing papers published between July 31, 1936, and July 1, 1939, edited by Eugene S. McCartney and published by the University of Michigan Press in 1939, is a comprehensive compilation of influential paleontological research. Among the notable articles included are E. C. Case's study on a nothosaur from the Triassic of Wyoming, Chester A. Arnold's multi-part observations on fossil plants from the Devonian of Eastern North America, and K. G. Brill's description of Productella waynensis, a new brachiopod from the New Providence Shale of Kentucky. The volume also features detailed examinations such as Chester A. Arnold's work on some fossil species of Mavonia from Oregon, E. C. Case's analysis of a specimen of Stylemys nebrascensis showing the bones of the feet and limbs, and Andrew H. McNair's study on cryptostomatous bryozoa from the Middle Devonian Traverse Group of Michigan. Helen Duncan contributes with her research on trepostomatous bryozoa from the Traverse Group of Michigan, and John A. Wilson describes a new species of dog from the Miocene of Colorado. This collection is an invaluable resource for paleontologists and researchers dedicated to the study of fossil plants and animals, providing detailed descriptions and insights into ancient life forms and their geological contexts.