PREFACE 



The results of the Amherst Patagonian Expedition 

 were divided into two parts, the general features, to- 

 gether with the narrative, were reported in a separate 

 volume entitled, "Hunting Extinct Animals in the Pata- 

 gonian Pampas," published in 1913. For this volume has 

 been reserved the description of the material found and 

 such conclusions as are directly derived from that ma- 

 terial. The material on which this work is based has 

 been prepared out and placed on exhibition at Amherst 

 College. 



The material here described forms a unified body of 

 data, which adds materially to our knowledge of the com- 

 plete animals of the Tertiary period in Patagonia. There 

 are beside this some small collections which offer some 

 isolated new facts, but the working up of these has been 

 reserved for the future for small articles, as the work 

 may come to maturity. 



The field has only been touched and a vast amount of 

 further work can be profitably done on the horizons im- 

 mediately preceding and following the one described in 

 this volume, after which an interesting study can be made 

 on the evolution of a fauna which developed in a consid- 

 erable degree of isolation. 



F. B. LOOMIS. 



March 18, 1914. 



