PRINCETON UNIVERSITY, 



E. M. MUSEUM OF ARCHAEOLOGY AND GEOLOGY. 

 PRINCETON, N. J., March i, 1901. 



Sir: 



I have the honor to transmit herewith the Report upon the Tertiary 

 Invertebrates collected by the Princeton expeditions to Patagonia, under 

 Mr. J. B. Hatcher. 



The collection, being the largest ever made in Patagonia, is valuable 

 not only from a palasontological, but also from a geological and zoogeo- 

 graphical point of view, and it has been possible to determine satisfactorily 

 the age of these Tertiary beds, and to compare them with other deposits 

 of the southern as well as the northern hemisphere. 



This refers especially to what is called, in this report, the Patagonian 

 formation, and we may say that we now possess in this marine series a 

 standard for correlating any other marine Tertiary beds of the southern 

 hemisphere. 



Very respectfully, your obedient servant, 



ARNOLD E. ORTMANN, PH.D. 



Curator of Invertebrate Paleontology. 

 DR. W. B. SCOTT, 



Professor of Geology, 



Princeton University. 



