Pseudoceratites of the Cretaceous

was the writei''s sad duty, as a representative of the United States Geo- ological Survey, to examine all the paleontological collections and manuscripts in Professor Hyatt's house in Cambridg-e, in order to take possession of those belonging to the Survey.The manuscript of the present volume was on his desk and contains the results of his last work, in which he was actively engaged on the day of his death.Fortunately it was almost readv for the printer, and although the careful reading of the manuscript to determine the author's exact meaning and intentions has consumed considerable time, the changes, either in arrangement or in wording, and the additions that have been found necessary are very few indeed.These list, and the descriptions of the plates after PI.XIX.T. W. Stanton.