no. 8 SKULL OF BRIDGER CREODONT—GAZIN 5 
Protopsalis for the Wind River form P. tigrinus Cope because he felt 
that the carnassial construction exhibited had not attained the Patri- 
ofelis stage, and restored Huerfano B Ambloctonus coloradensis to 
Patriofelis, largely on the basis of characters of the lower jaw proper. 
A new species, Patriofelis compressa, was described, characterized 
by slender premolars, on a lower jaw (A.M.N.H. No. 17017) also 
from the Huerfano B stage in Colorado. 
P. M. Butler (1946) in a discussion of the evolution of carnassial 
dentitions in certain creodont subfamilies indicated the changes that 
took place in the development of the Oxyaeninae, culminating in 
Patriofelis. In his treatment of the various subfamilies he gave no 
preferred arrangement of these into families, but did discuss the 
general characteristics of the superfamilies or tribes as named by 
Matthew. 
TAXONOMIC SUMMARY 
The taxonomic arrangement adopted here is essentially that of 
Matthew, modified by Denison, but with minor differences and a cor- 
rected synonymy as far as known material can be interpreted. Al- 
though species are not redescribed, annotations are included where 
pertinent and a key is added. 
OXYAENIDAE Cope, 1877 
OXYAENINAE Trouessart, 1885 
PATRIOFELIS Leidy, 1870 
Synonyms.—Limnofelis Marsh, 1872. 
Oreocyon Marsh, 1872. 
Protopsalis Cope, 1880. 
Aelurotherium Adams, 1896. 
Type.—Patriofelis ulta Leidy, 1870. 
Discussion.—The number of incisors above and below for the mid- 
dle Eocene or Bridger members of this genus is two in the material 
at hand, although Matthew has indicated (1909) that the number is 
three in the lower jaw, based partly on the appearance of alveoli in 
A.M. No. 12078. If Matthew has correctly interpreted No. 12078, the 
number of lower incisors in Patriofelis is variable as in Oxyaena. 
Moreover, Patriofelis has been characterized as lacking the second 
upper molar. Its presence, however, is variable, as a vestigial M? may 
occur, possibly characterizing lower Bridger P. ulta (and Huerfano 
species ?). 
