no. 8 SKULL OF BRIDGER CREODONT—GAZIN 17 
Length of cheek tooth series, P?-M}, inclusive................+ 68.5 
I? (at alveolus), anteroposterior diameter: transverse diameter. . 9.0: 4.0 
I? (at alveolus), anteroposterior diameter: transverse diameter.. 13.0: 10.0 
C (at alveolus), anteroposterior diameter: transverse diameter.. 23.0: 16.0 
P2, anteroposterior diameter: transverse diameter posteriorly... 11.2: 8.0 
P3, anteroposterior diameter externally: transverse diameter per- 
pendicular’ toy outetawalll: jas sige dee «kiiaee ce aac aa ower eres 17.8: 19.0% 
P4, anteroposterior diameter externally: transverse diameter per- 
DENGICT ate TOPOULER, Wall ys ots) c.cve, je ycpalcre'eisis <:5l<ie aie enya tear anise 18.5 : 22.0° 
NIU ANterGPOSLehlOL, GiaIMeleh ese. a.c.ac 6 ciiies ers o.sre eiererecusiereuiele atere 21.5 
Ma. SredteSwUMINClCEs sts cervacs Geese s cescceseiae cease cee dem as 4.0 
Mandible: 
Length from anterior margin of symphysis to posterior surface 
Ole CONCYIEMINECIAll Vs Manremine cucice ae aus micite eee eects L777. 
Meet OL SV HIDMvale se oe ot oc ae caste c Cae vs owe econ ee haet ecules 60. 
Posterior margin of M, (at alveolus) to posterior surface of 
eondyle medially: is ocsts seniiodsoaY ices de MINES ei deasioes Es 76. 
Lower dentition: 
Anterior margin of lateral incisor to posterior margin of M, 
CAE HaIVGOLID) (e003 aie a en ae re DOL ee weet sg Gee ee oe 103. 
Length of cheek tooth series, P,-M, (at alveoli) inclusive..... 76. 
I, (at alveolus), anteroposterior diameter: transverse diameter. . 6.5 : 3.0 
I, (at alveolus), anteroposterior diameter: transverse diameter... 7.8:5.0 
C (at alveolus), anteroposterior diameter.................000. 21.0 
P., anteroposterior diameter: transverse diameter at talonid.... TO5. 7.2 
P.,, anteroposterior diameter: transverse diameter at talonid.... 13.3: 9.5° 
P,, anteroposterior diameter: transverse diameter at talonid.... 17.8: 11.6 
M,, anteroposterior diameter: transverse diameter at trigonid.. 16.0: 8.5 
M., anteroposterior diameter: transverse diameter............. 18.6: 10.0 
* Approximate. 
SUMMARY OF RELATIONSHIPS 
The position of Patriofelis in the Oxyaenidae, as the culminating 
stage of the Oxyaeninae in North America, seems firmly established, 
although it should be noted that a later survival of the subfamily is 
believed represented by the genus Sarkastodon (Granger, 1938) in 
the upper Eocene of Asia. The genus Oxryaena is first recognized in 
the Clark Fork Paleocene and carries through the lower Eocene repre- 
sented by several species. An intermediate form, Protopsalis, here 
regarded as a subgenus of Patriofelis, is known from the Lost Cabin 
level of Wasatchian time and Patriofelis proper characterizes the 
upper Huerfano as well as both upper and lower levels of Bridger 
Middle Eocene. The lower Bridger species Patriofelis ulta may well 
be the forerunner of larger Patriofelis ferox, and although in turn 
evidently derived from O-yaena through the Protopsalis stage, the 
