134 



University of California Publications in Geology 



[Vol. 10 



TETR ABELODON ?, sp. 



A single lower cheek-tooth (no. 22883, fig. 3) found by Mr. Elmer 

 Molthan one quarter of a mile south of locality 3037 near Ironside, 

 Oregon, represents a large mastodontine form presumably from the 

 same formation and from approximately the same horizon as the teeth 



Fig. 3. Tetrabelodon?, sp. Lower cheek-tooth, no. 22883, natural size. Outer 

 and occlusal views. From late Tertiary beds near Ironside, Oregon. 



described as Hipparion anthonyi. The low conical tubercles are 

 lightly connected transversely, and a few accessory tubercles are situ- 

 ated in the transverse valleys. This form resembles a type found in 

 Great Basin beds referred to Pliocene or late Miocene, but the Pliocene 

 mastodontine forms of this province are as yet very imperfectly 

 known, and until further comparative studies have been made it is 

 not possible to make satisfactory determination of the species repre- 



