346 University of California Puhlications in Geology [Vol. 12 



contour; (3) the deuterocone is considerably more developed and 

 reaches much farther forward, the base of the tooth at its anterior 

 edge sweeping inward from the adjoining base of the protostyle 

 instead of forming a sharp angle with the mid-wall of the protocone 

 as in H. sivalensis; (4) the referred is larger than the correspond- 

 ing tooth of H. sivalensis, and the ratio of anteroposterior and trans- 

 verse diameters are unlike, being .95 in the Eden specimen and 1.15 

 in H. sivalensis; (5) the direction of the inner ridge is more oblique to 

 the inner tooth margin than is apparently the case in Hyaenarctos 

 sivalensis, and the inner ridge at its mid-point is proportionately much 

 farther from the inner tooth margin than in H. sivalensis; (6) the 

 external faces of the main cusps are more vertical, and lack the well 

 developed cingulum ; the outer tooth contour also lacks the deep mid- 

 indentation seen in H. sivalensis. 



Compared to Hyaenarctos jjunjabiensis;'-^^ The carnassial of the 

 unworn series of H. punjabiensis illustrated by Dr. Lydekker is nar- 

 rower and lighter than the pre,sent type specimen, and differs from 

 it very markedly in the small size of its protostyle and more feeble 

 development of its tritocone. In two minor characters, on the other 

 hand, (1) the more even contour of the external base, due to the more 

 similar anterior position of the protostyle, and (2) the apparently 

 greater development of the deuterocone, H. punjabiensis resembles the 

 new specimen more than does H. sivalensis. 



Compared to the first molar of Indarctus salmontanus;'''' The M- 

 referred to the new specimen is slightly broader than long antero- 

 posteriorly, and thus differs somewhat widely from the I. salmontanns 



which is distinctly longer than broad. of I. oregonensis is not 

 known. 



The P- of I. salmontanns and the P- of Inelarctos oregonensis^'^ bear 

 no very close resemblance to the carnassial of H. gregoryi, and differ 

 from it more markedly than does H. sivalensis; (1) the protostyle of 

 I. oregonensis is even less developed than in H. sivalensis, and its 

 position is fully as internal; (2) the deuterocone is produced anter- 

 iorly even less than in //. sivalensis; (3) the deuterocone occupies 

 considerably more of the transverse width of the tooth than in either 

 the present specimen or in II. sivalensis. 



34 Lydekker, E. Op. ext., pi. 30, fig. 2. 



35 Pilgrim, Guy E. Eecords Geol. Siirv. India, vol. 44, pp. 225-233, pi. 20, 1914. 



36 Merriam, Stock, and Moody. Op cit., pp. 91-93, 1916. 



