NO. 2187. A NEW PALEOCENE MAMMAL— GIDLEY. 435 



second main cusp of the outer row, since the former has no func- 

 tional talonid. 



WhUo it is freel}^ admitted that the foregoing observations on the 

 possible structure of the upper cheek-teeth can not be submitted as 

 evidence in the present case, they seem to lend some weiglit to the 

 conclusions at which I have arrived concerning the probable affini- 

 ties of this new mammal from the Fort Union. 



These conclusions may thus be briefly summarized: From the 

 evidence at hand I conclude that Titanoides primaevus can not be 

 classed with the Amblypoda, that it is probably a Perissodactyl, and 

 certain features make it not improbable that it is rather closely 

 related to the Titanotheres. Future discoveries, however, may 

 prove that its relationship is so remote as to necessitate the estab- 

 lishment of a new family for the reception of this genus. 



EXPLANATION OF PLATE 36. 



Fig. 1. — Titanoides primaevus, page 431. Crown view of lower cheek-teeth. 

 Type, Xf+. Cat. No. 7934 U.S.N.M. Coll. 



Fig. 2. — Cast of restoration representing conjectural upper cheek-teeth of Titanoides 

 primaevus. X|+. Page 434. 



Fig. 3. — Bad Lands about 3 miles northeast of Buford, North Dakota. X indicates 

 the spot where the type of Titanoides primaevus was fo;ind. 



