CONTENTS 
CHAPTER PAGE 
I. Organization of the expedition—history of the work done in the 
WEsecad oO toOnmatlOM)..o5 ches Me ees oc oe Meise soo, aestete ee 1 
II. Description of the Amherst locality—age of the overlying beds— 
age of underlying beds—age of Deseado.................... 6 
Ill. 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, Conioptero- 
therm, Hricoelodus, Proadianthus: ...........-+6.:-.-..- 28 
V. Typotheria, Archaeohyrax, Plagiarthrus, Prohegetotherium, 53 
Prosotherium, Propachyrucos, Phanophilus, Archaeophylus, 
Eutrachytherus, Argyrohyrax, Isoproedrium............. 
VI. Rhynchippidae, Toxodontia, Rhynchippus, Morphippus, Eu- 
REMIOPS eta ete UN Neri eco Vere cide, Ae at ERM, SA 86 
VII. Leontinirdae, Leontinia, Ancylocoelus.....................-. 108 
VIII. Nesodontidae, Proadinotherium, Pronesodon, Coresodon, Inter- 
HPS NESE PMS <=, +. ote 14s. acetate ie we © Se Oke ne e122 
IX. Isotemnidae, Trimerostephanus, Pleurocoelodon, Lophocoelus, 
Hennconlholia: toned hoses Ao ae es eee ee eee 129 
Xe omalodontotneria, Asmodeus. a. 4.....4. 402-22 .5 004-6 eye 134 
Del. Astrapotheria,, Parastrapotherinits . oj. 6a) cc o/c es ere ne eh wo ae 142 
geeky rothenrta why fOuneriitia ts ae silso feces Lae eeesk wee el. oe oe 156 
XIII. Rodents, Cephalomys, Scotamys, Litodontomys, Asteromys, 
HE GSTEINONTY Siasn, acto PS ee re oe Pee arcane hyd SSR NE Se arses sty 185 
XIV. Edentata, Proeutatus, Prozaedius, Stenotatus, Proeuphractus, 
Peltephilus, Palaeopeltis, Glyptatelus, Hapalops, Octodonto- 
Lienstiant, SMO cae. 2 ese eve cw settee Be aio whee. se, Maia 197 
XV. Marsupialia, Pharsophorus, Notogale, Proborhyaena, Palaeo- 
thentes, Pilchenia, Callomenus, Pseuhalmarhippus, Parabderi- 
MV eb irdssehysornis. Woxorls)..;¢ce5 2. soc ess ae keds eee eee soo 225 
