Reviews 



The Ostoleogy of the Chalicotheroidea. By W. J. Holland and O. A. 

 Peterson. Memoirs of the Carnegie Museum, Vol. Ill, 

 No. 2, 1914. 



No contribution to paleontologic science made by the Carnegie 

 Museum of Pittsburgh presents more material of interest than the recent 

 work on the chalicotheres by Dr. Holland and Mr. Peterson. Though 

 representatives of this peculiar group have been certainly known in 

 America for many years, beginning with the first recognition of 

 remains from the Tertiary of the West by Marsh in 1877, these 

 animals have been among the most imperfectly understood of the 

 American Tertiary mammals. 



The marvelous discoveries of Miocene mammals at the Agate Spring 

 quarries in the past few years have fortunately included most excellent 

 material of the chalicotherian genus Moropus. With the material 

 obtained by the Carnegie Museum as a basis for comparative study, 

 Dr. Holland and Mr. Peterson have in a most commendable manner 

 taken up the description of the osteology and the affinities of the 

 Chalicotheroidea of America. The present monograph is a very satis- 

 factory description, illustrated with excellent figures representing the 

 osteology of these forms, and bringing into view through comparative 

 study all of the American material. 



The paper combines a statement of detailed description and analysis 

 of the skeleton with the generalizations required in reconstruction of the 

 animal, and in the statement of affinities of the genera. 



Workers in the field of paleontology and geology are certainly grate- 

 ful to the authors for bringing together all of the available information 

 on this group, and for giving us this excellent discussion of the osteology 

 and relationships. This paper also furnishes material which makes it 

 possible to determine, compare, and correlate fragmentary chalicotherian 

 material from many widely scattered Tertiary deposits through the 

 West, and to obtain from the study of these fragments more satisfactory 

 conclusions as to the faunal relationships of the beds concerned than have 

 heretofore been secured. 



John C. Merrla.m 



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