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. 
