no. 8 SKULL OF BRIDGER CREODONT—GAZIN 3 
Wasatch and Wind River fauna, discussed and refigured the type of 
Patriofelis ulta and named as new the species ?Patriofelis leidyanus, 
based on a jaw portion in the Princeton collections (No. 11375) in- 
cluding, as was later shown, only deciduous teeth. Although uncer- 
tain as to the generic reference for his new species, he believed that 
it indicated for Patriofelis, along with Palaconictis, an ancestral posi- 
tion with respect to the true felids. Scott in his revision of the 
creodonts in 1892 also included Patriofelis in the Palaeonictidae, but 
placed Protopsalis along with Oxyaena in the Hyaenodontidae! He 
recognized, however, that Oreocyon Marsh, and hence that part of 
Limnofelis which had been named L. latidens, was a synonym of 
Patriofelis, but tentatively placed Limnofelis in synonymy with Pro- 
topsalis. Nevertheless, he followed Cope’s later thinking in deriving 
the Felidae as well as other modern Carnivora from the Miacidae. 
Wortman’s most significant contribution to the study of Patriofelis 
appeared in 1894 and included a detailed description of the mounted 
skeleton and other newly acquired materials in the American Mu- 
seum; He placed both Limnofelis and Protopsalis in synonymy with 
Patriofelis, concluded that only two species were represented, the 
large P. ferox and smaller P. ulta, and transferred the group to the 
Oxyaenidae. No reference was made to Marsh’s Oreocyon latidens ; 
presumably he regarded this as something different. Furthermore, 
the species that he had earlier named ?Patriofelis leidyanus was be- 
believed not to represent Patriofelis, but a form which might be the 
forerunner of the Nimravidae. Adams, in 1896, following Wortman’s 
suggestion, gave ?P. leidyanus the new generic name Aelurotherium, 
and because of it regarded the Felidae as polyphyletic. Wortman, in 
1899, placed this genus in the Palaeonictidae, separate from the 
Oxyaenidae, and in 1gor placed his species A. leidyanum in synonymy 
with Marsh’s Limnofelis latidens as Aelurotherium latidens. This 
procedure, however, was in error as the immature lower jaw of 
Limnofelis latidens, with which comparison was made and which he 
figured as a type, was not the type but a referred specimen, and hence 
could not carry the name. The actual type of Limnofelis latidens, and 
hence of Oreocyon latidens, was a P* which Wortman in a later part 
of the same paper referred to Patriofelis ferox, clearly listing Lim- 
nofelis latidens as a synonym of Patriofelis ferox. Also in 1901 he 
described the new species Aelurotherium bicuspis on the basis of a 
lower cheek tooth, which he regarded as M, (Y.P.M. No. 11755). 
Although now recognizing that the known lower premolars of Aelu- 
rotherium were deciduous, he defended his 1892 conclusions as to 
the ancestral position of Aelurotherium with respect to the Oligocene 
