2 PATAGONIAN EXPEDITIONS! PALEONTOLOGY. 



It has been my privilege to study all of the principal collections of Santa 

 Cruz fossils, including almost all of the types. These collections are, in 

 addition to the one at Princeton, those of the American Museum of Nat- 

 ural History, New York, the Munich Museum, the British Museum, the 

 La Plata Museum, and, most important of all, the private collection of 

 Dr. F. Ameghino. Abundant use has been made of the free permission 

 accorded me to figure and describe such material as suited my purpose. 



As this volume may fall into the hands of some who will have no op- 

 portunity or occasion to consult Volume I of these Reports, it will not be 

 superfluous to repeat here a number of statements from the general edi- 

 torial preface. 



In the spring of 1901 the writer found it necessary " to visit the Mu- 

 seums of La Plata and Buenos Aires and study the collections there gath- 

 ered. He is glad of this opportunity to express his feelings of profound 

 gratitude to those who did everything in their power to render these 

 investigations helpful and satisfactory. 



"Dr. Florentine Ameghino, now director of the National Museum at 

 Buenos Aires, but then living in La Plata, permitted the freest possible use 

 of his great private collection of Patagonian fossils, a collection which is 

 especially valuable because it contains by far the largest number of the 

 type specimens of the genera and species named from Patagonian 

 horizons. 



"Dr. F. P. Moreno, Director of the La Plata Museum, . . . placed his 

 museum and all its resources unreservedly at the disposal of the visitor, 

 who, living in the building for several months, enjoyed its hospitality in 

 the most literal sense of the word. The Secretary of the Museum, Sr. 

 R. Catani, and the Curators, Dr. Santiago Roth, Professor R. Hauthal, 

 Dr. R. Lehmann-Nitsche and Sr. Carlos Bruch, were indefatigable in 

 their assistance, and most hearty thanks are due to each and all of them 

 for countless instances of helpful kindness." 



In addition, I wish to express my cordial thanks to my friend, Pro- 

 fessor H. F. Osborn, who has given me unrestricted use of the fine col- 

 lection of Santa Cruz fossils, made for the American Museum of Natural 

 History by Mr. Barnum Brown. This collection admirably supplements 

 that made by Messrs. Hatcher and Peterson for the Museum of Princeton 

 University. How extensively this collection has been employed will be 

 apparent from the plates. 



