NOTICE OF A NEW PALEOCENE MAMMAL, A POSSIBLE 

 RELATIVE OF THE TITANOTHERES. 



By James Williams Gedley, 



Assistant Curator of Fossil Mammals, United States National Museum. 



While recently in the vicinity of old Fort Union, (Buford), North 

 Dakota, Dr. Vernon Bailey, of the United States Biological Survey, 

 made an accidental discovery of a few associated fossil teeth and jaw 

 fragments which he found in the bad land deposits, of Fort Union age 

 (Paleocene) at that locality. This proves to be an important find, as 

 the specimen represents a mammal of much larger size and apparently 

 of different ordinal affinities than any hitherto reported from this 

 horizon. The specimen has been kindly presented to the United 

 States National Museum by Doctor Bailey, and is here described. 



TITANOIDES, new genus. 



Lower molars brachyodont-lophodont; with the W pattern char- 

 acteristic of the Titanotheres but; with talonid less elevated than 

 trigonid; paraconid elevated and well separated from the metaconid 

 so that the anteroposterior diameter of the trigonid is but sHghtly less 

 than its transverse; last molar largest, the series gradually diminish- 

 ing in size forward; hypoconuUd present in m^ but this tooth has no 

 true third lobe; premolar with molariform (i. e. V shaped) trigonid 

 but with talonid rudimentary; jaw symphysis relatively short, wide 

 and shallow, not sutured; canine, as indicated by a portion of the 

 alveolus preserved, appears to have been of about the same relative 

 size and position as in the Titanotheres. 



Type of the genus. — Titanoides lyrimaevus, new species. 



TITANOIDES PRIMAEVUS, new species. 



Plate 36, figs. 1,2. 



Type.— LowQV m^ and m^, anterior half on m^ and pC?)*, all of the 

 right side; a portion of m^ of the left side; and two portions of the 

 jaw symphysis. (Cat. No. 7934 U.S.N.M. Coll.). While the teeth 

 are all detached there is no reasonable doubt that they and the jaw 

 portions belong to a single individual. 



Proceedings U. S. National Museum, Vol. 52-No. 2187. 



431 



