1921] Frick: Fauuas of Bautista Creek and San Timoteo Canon 3-4:7 



The teeth of //. gregoryi are much larger than those of Dr. Lydek- 

 der's H. palaeindicus, which are perhaps more Hemicyon-hke than 

 Hijae)tarcfos-hke in the shortness of the M- and the great roundness 

 of the inner tooth angles. On the other hand, in certain minor char- 

 acters the H. palaeindieus M- as compared with H. sivalensis is nearer 

 the present species: (1) in the apparently greater development of 

 the protostyle and in the more anterior position of the basal region 

 of the deuterocone of the carnassial; (2) in the abruptnes of the main 

 cone above the outer tooth margin, in the apparent lack of a marked 

 external cingulum, and the greater distance of the inner ridge from 

 the inner tooth margin of the first molar. 



The Hyacnarctos from the Red Crag, represented in a tirst superior 

 molar, is shown by Lydekker (loe. cit.) to be specifically different from 

 the of H. sivalensis, though very similar in general tooth outline, 

 well marked external cingulum, and bold outer cones. In the rela- 

 tively considerable distance of the inner ridge from the inner tooth 

 border the Eden specimen and the Red Crag specimen agree in 

 differing from H. sivalensis. 



The carnassial of the much smaller H. insigms, described by Ger- 

 vais from the Montpellier of France, differs more widely from the 

 Eden form than does //. sivalensis. 



Summary. — The Eden fauna contained a very large liear with a 

 dentition of strong hyaenarctid character. The teeth differ specifically 

 from all previously described forms. They resemble more closely 

 Hyacnarctos svvalen.ns (H. i^unjabiensis and palaeindkus only in 

 minor characters) of the Indian Pliocene than any American sijecies 

 so far known. A smaller and closely allied form is suggested by a 

 second carna.ssial, of smaller size. The difference in size, however, 

 may be merely a sex character, such a difference being very marked 

 in some of the living beai's. On the other hand, the occurrence of a 

 number of allied forms is to be expected should the Western 

 Hemisphere indeed have given rise to the aretothere group. 



