Chapter I: Front Matter

Transcriber’s Notes:

Underscores “_” before and after a word or phrase indicate _italics_ in the original text. Equal signs “=” before and after a word or phrase indicate =bold= in the original text. Small capitals have been converted to SOLID capitals. Illustrations have been moved so they do not break up paragraphs. Old or antiquated spellings have been preserved. Typographical and punctuation errors have been silently corrected.

The Deseado Formation
of Patagonia

Frederic Brewster Loomis, Ph.D.

_Professor of Comparative Anatomy
Amherst College_

EIGHTH AMHERST EXPEDITION
1911

PUBLISHED UNDER THE AUSPICES OF
THE TRUSTEES OF AMHERST COLLEGE
1914

_Copyright, 1914_
BY FREDERIC B. LOOMIS

THE RUMFORD PRESS
CONCORD · N · H ·

CONTENTS

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