92 University of California Publications in Geology [Vol. 10 



sembles Hyaenarctos. If isolated from other material, P- would 

 certainly be considered as representing Hyaenarctos rather than the 

 Arctotherium type. 



7 



Figs. 4a to 4c. Indarctos(P) oregonensis, n. sp. P*, no. 22362, natural size. 

 Fig. 4a, occlusal view; fig. 4b, outer view; fig. 4c, inner view. Rattlesnake for- 

 mation, John Day Valley, Oregon. 



Fig. •">. II i/tif'ini t'ctos insignia P. Gervais. P 1 , occlusal view, natural size. 

 Montpellier, France. (After Gervais.) 



Fig. 6. Hyaenarctos palaeindicus Lydekker. P±, occlusal view, natural size. 

 Siwalik beds, India. (After Lydekker.) 



Fig. 7. Hyaenarctos insignis P. Gervais. P 1 , inner view, natural size. Mont- 

 pellier, France. (After Gervais.) 



The upper carnassial of no. 22362 may be more primitive than 

 that of Arctotherium in the anterior position of the deuterocone, and 

 is more specialized in the presence of a large protostyle. In the 

 Oregon form the anterior border of the deuterocone is situated approx- 

 imately as far forward as the anterior border of the protocone, and 



i Blainville, H. M. D., Osteographie des mammiferes, Atlas 2, pi, 12, 1864. 

 ■ Pilgrim, Guv E., Records, Geological Survey of India, vol. 44, part 3, pp. 

 225-233,' pi. 20, 1914. 



