Book — cover-title,  p. illus., plates (1 fold.) fold. maps. 24cm.
- A detailed study of the structure and relationships of a new zalambdodont insectivore from the middle Oligocene. - The Torrington member of the Lance formation and a study of a new Triceratops. - A new basal Oligocene formation. - New vertebrates and the stratigraphy of the Oligocene and early Miocene.