196 MEMOIRS OF THE CARNEGIE MUSEUM. 
or rolled about in the waves, which beat upon the sandy margin of the lakelet or 
wide river. 
The study of the interesting remains, a sketch of the story of the recovery of 
which has been given in the preceding paragraphs, necessitated an investigation 
of the entire literature of the subject, as well as the examination of the remains 
of allied forms preserved in other museums. The material representing the 
Chalicotheroidea in American collections has until recently been scanty. The 
type of Moropus elatus Marsh at the Yale University Museum consists of a few 
broken, but recognizable fragments’ of the bones of the feet. Permission to make 
casts of them was kindly accorded by the authorities of the Yale Museum. These 
casts have proved of great service in the determination of the remains obtained in 
our excavations. ‘To Professor Charles Schuchert and Dr. R. 8. Lull I desire to 
express my thanks for their kindness in this connection. The collection of chali- 
cotherine remains preserved in the National Museum of France in the Jardin des 
Plantes in Paris is important. I am deeply indebted to the authorities of this 
museum for reproductions of their material. Professor M. Boule, with that 
charming kindness which characterizes him, has sent me excellent casts of the 
type-specimens of Macrotherium Lartet, Schizotherium Gervais, and Ancylothervum 
Gaudry, which are preserved in the great scientific treasure-house of France. 
They have been of value in enabling us to make exact comparisons with the 
remains of the creatures which we have uncovered in Nebraska. To Professor 
Edmond Perrier and Professor Boule I wish in this connection to renew my heart- 
felt thanks for all the kindness they have shown me on the occasion of various 
visits to the French metropolis. I am also indebted to the authorities of the Royal 
Museum in Munich for casts of the material representing Nestoritherium Kaup. = 
Ancylotherium Gaudry, which were used by the late Professor Zittel in illus- 
trating his great Manual of Paleontology. My good friend, Dr. Arthur Smith 
Woodward, of the British Museum has placed me under obligations by having a 
reproduction made for me of the cast of the type of Chalicotherium sivalense Falconer, 
which is fortunately preserved in the National Collection in South Kensington. 
The original is lost, as I shall have occasion to state elsewhere. 
* In the summer of 1908 Professor H. F. Osborn sent a party from the American Museum of Natural 
History to the region of the Agate Spring Quarries, and parties from Yale, Amherst, and the University of 
Nebraska likewise came to the spot. ‘‘ Where the carcass is, there will the eagles be gathered together.” All 
of them were successful in getting some fragments of Moropus, and Professor Osborn’s party secured portions 
of a skull. Since the withdrawal of the Carnegie Museum from the field we understand that the American 
Museum of Natural History has been operating in the quarries opened by Mr. Peterson and has secured valuable 
material. 
