CONTENTS. 
Vll 
Actceonidce d’Orb. 2 43 
Bullidce Pilsbry 2 4 5 
CRUSTACEA 2 47 
ClRRIPEDIA 2 47 
Lepadidce Darw. .......... 247 
Verrucidce Darw. .......... 248 
Balanidce Darw. .......... 249 
Decapoda 255 
Carcinoplacidce Ortmann . . . . . . • • • 255 
LIST OF FOSSILS DESCRIBED 256 
GENERAL CONSIDERATIONS 260 
The Patagonian Beds 260 
Identity of Patagonian and Suprapatagonian Beds . . . . . . 265 
The Age of the Patagonian Beds . . . . . . • • • 286 
The Magellanian Beds . . . . . . • • • • • 3°3 
The Cape Fairweather Beds (? Marine Tehuelche Beds) .... 307 
Origin and Development of the Patagonian Marine Faunas . . . . 310 
1. Theory of Antarctica 3 10 
2. Relations of the Patagonian Deposits to Other Parts of South America 
AND TO THE REST OF THE WORLD: THEORY OF “ ArCHIPLATA ” AND 
“ Archhelenis ”. .......... 3 1 9 
BIBLIOGRAPHY 3 2 5 
PART III. MAMMALIA OF THE SANTA CRUZ BEDS. 
MARSUPIALIA. 
By W. J. SINCLAIR. 
INTRODUCTION 333 
CLASSIFICATION OF THE SANTA CRUZ MARSUPIALS . . . . 334 
POLYPROTODONTIA 34 1 
Thylacynid^e ............ 341 
Borhycena Amegh. .......... 347 
Prothylacynus Amegh. ......... 362 
Cladosictis Amegh. . . . . . . . . . . 3 76 
Amphiproviverra Amegh. . . . . . . . . . 394 
Relationships of the Thylacynid.e ......... 406 
Didelphyid^e ............ 408 
Microbiotherium Amegh. ......... 408 
DIPROTODONTIA 416 
CjENOLESTIDAS ............ 416 
Cmnolestinm . . . . . . . . . . . 4 I 9 
Halmarhiphus Amegh. . . . . . . . . 419 
Garzonia Amegh. . . . . . . . . . 422 
Palmothentinje ........... 425 
