1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas. 5 | 
Key to the families of Creodonta. 
A. Procreodi. Ungual phalanges fissured or unfissured, but not flattened. 
A ING CATR eSUS og ee os ewe Arctocyonide, Oxyclenide. 
B. Eucreodi. Ungual phalanges not fissured. 
2. Jameesial teeth bp aad ay oo ee co Pe Se, eae ee ee Miacide. 
C. Pseudocreodi. Ungual phalanges fissured. 
a: Carnassial teeph mi ai Me ea is eat ee Oxyenide. 
Ae. (Carne eeig) Tee We ON Wiehe ois ar wes eke ss cae Hyenodontide. 
D. Acreodi. Ungual phalanges fissured and flattened. 
5. ING+ CBIR Sea cc er een ee re ee Mesonychide and T'riisodontide. 
e 
OXYCLANID Scott 1892.1 
Chriacus Cope 1883.” 
Type, C’. pelvidens (Cope 1881 *) from Torrejon of New Mexico. 
This genus is common in the Torrejon but not hitherto discovered in the 
Wasatch. As with most of the Paleocene mammals its systematic status 
has been doubtful. Cope and Scott referred it to the Creodonta; Osborn 
and Karle in 18954 tentatively referred it to the Primates, to which Scott 
had suggested that it was probably related. Matthew in 1897 and subse- 
quently, referred it to the Creodonta more or less provisionally as a member 
of the primitive family Oxyclende. Wortman in 19025 suggested that 
this family might prove to be of Insectivore affinities “with numerous 
transitional or Metatherian characters.’ The specimen described below 
affords some important evidence as to the affinity of this genus. The 
construction of the manus is completely in accord with the less specialized 
Creodonts, as are also the parts preserved of the hind foot. While not 
wholly conclusive, the evidence is decidedly in favor of the Creodont affini- 
ties of Chriacus. 
A subfamily distinction from the Arctocyonine is perhaps afforded by 
the reduced and non-opposable pollex in this genus. The hallux is unre- 
duced, and compares with Miacine and Arctocyonide. 
The characters of the manus exclude Chriacus from the Primates to 
which it was tentatively referred by Osborn and Earle, and make it very 
improbable that it has any Insectivore affinities. 
1 Proc. Acad. Nat. Sci. Phila., Vol. XLIIT, p. 294. 
2 Proc. Acad. Nat. Sci. Phila., Vol. XXXIV, p. 80. 
3 Lipodectes pelvidens Cope 1881, Amer. Nat., Vol. XV: p: L019. 
4 Bull. Am. Mus. Nat. Hist., Vol. VII, p. 20. 
5 Am. Jour. Sci., Vol. XIII, p. 434, footnote. 
