CONTENTS 



CHAPTER PAGE 



( I.\ Organization of the expedition — history of the work done in the 

 — Deseado formation I 



II. Description of the Amherst locality — age of the overlying beds — 

 >^ ) age of underlying beds — age of Deseado 6 



fill. 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, 

 Xotodiaphorus, Deuterotherium, Protheosodon, Conioptero- 

 therium, Tricoelodus, Proadianthus 28 



V. Typotheria, Archaeohyrax, Plagiarthrus, Prohegetotherium, 53 

 Prosotherium, Propachyrucos, Phanophilus, Archaeophylus, 

 Eutrachytherus, Argyrohyrax, Isoproedrium 



VI. Rhynchippidae, Toxodontia, Rhynchippus, Morphippus, Eu- 



geniops 86 



VII. Leontinirdae, Leontinia, Ancylocoelus 108 



VIII. Nesodontidae, Proadinotherium, Pronesodon, Coresodon, Inter- 



hippus, 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, Octodonto- 

 therium, Orphodon 197 



XV. Marsupialia, Pharsophorus, Notogale, Proborhyaena, Palaeo- 

 thentes, Pilchenia, Callomenus, Pseuhalmarhippus, Parabderi- 

 tes 210 



XVI. Birds, Physornis, Loxornis 225 



