| CHAPTER | PAGE |
| I. | Organization of the expedition—history of the work | |
| | done in the Deseado formation | [ 1] |
| II. | Description of the Amherst locality—age of the overlying | |
| | beds—age of underlying beds—age of Deseado | [ 6] |
| III. | Table of the animals—study of the feeding habits— | |
| | character of the habitat—the origin of the elements | |
| | of the Deseado fauna | [19] |
| IV. | Systematic arrangement—the Litopterna, Eoproterotherium, | |
| | Notodiaphorus, Deuterotherium, Protheosodon, | |
| | Coniopterotherium, Tricoelodus, Proadianthus | [28] |
| V. | Typotheria, Archaeohyrax, Plagiarthrus, Prohegetotherium, | |
| | Prosotherium, Propachyrucos, Phanophilus, | |
| | Archaeophylus, Eutrachytherus, Argyrohyrax, | |
| | Isoproedrium | [53] |
| VI. | Rhynchippidae, Toxodontia, Rhynchippus, Morphippus, | |
| | Eugeniops | [86] |
| VII. | Leontinirdae, Leontinia, Ancylocoelus | [108] |
| VIII. | Nesodontidae, Proadinotherium, Pronesodon, Coresodon, | |
| | Interhippus, Nesohippus | [122] |
| IX. | Isotemnidae, Trimerostephanus, Pleurocoelodon, Lophocoelus, | |
| | Henricofilholia | [129] |
| X. | Homalodontotheria, Asmodeus | [134] |
| XI. | Astrapotheria, Parastrapotherium | [142] |
| XII. | Pyrotheria, Pyrotherium | [156] |
| XIII. | Rodents, Cephalomys, Scotamys, Litodontomys, Asteromys, | |
| | Eosteiromys | [185] |
| XIV. | Edentata, Proeutatus, Prozaedius, Stenotatus, | |
| | Proeuphractus, Peltephilus, Palaeopeltis, Glyptatelus, | |
| | Hapalops, Octodontotherium, Orphodon | [197] |
| XV. | Marsupialia, Pharsophorus, Notogale, Proborhyaena, | |
| | Palaeothentes, Pilchenia, Callomenus, Pseuhalmarhippus, | |
| | Parabderites | [210] |
| XVI. | Birds, Physornis, Loxornis | [225] |