58 Bulletin American Museum of Natural History.  [Vol. XXXIV, 
than would be indicated by the associated fragments with the closely related 
genus Ambloctonus, not much smaller than Patriofelis. Both astragali are 
present, and compare with the Bridger and Washakie species of Limnocyon. 
The trochlea is distinctly grooved, narrower transversely and more concave 
and elongate antero-posteriorly than in Oxyena, Patriofelis or Dipsalidictis; 
the neck is rather short and the head wide but of considerable depth towards 
its external side. The calcaneum is not preserved; the navicular is broad 
and of little height but considerable dorso-ventral depth with a heavy 
inferior hook projecting beneath the cuneiforms. The mesocuneiform is 
small, much like that of Oxyena; the entocuneiform deep dorso-ventrally, 
with heavy inferior hook, large navicular facet and deep facet for mt. I. 
Of the metatarsals mt. IJJ—V of the right side are complete, III and IV of 
nearly equal length, V one-fifth shorter, and somewhat stouter in shaft. They 
are of moderate length, comparable to Oxyena in proportions, although much 
larger. The phalanges are much longer than in Oxyena, their combined 
length one fourth greater than that of the metatarsal while in Oxyena the 
metatarsal is as long as the three phalanges, and in Patriofelis it is longer. 
The second phalanx is not flattened as in Oxyena; the ungual is larger, longer, 
less curved, somewhat more compressed, and with a deep but narrow fissure. 
Three vertebree from the middle caudal region indicate a long, heavy tail. 
This specimen belongs to the Pseudocreodi as indicated by the fissured 
unguals, not flattened as in Mesonychide. It is very clearly distinguished 
from Oxyena and Patriofelis, and approximates Limnocyon in the proportions 
of the phalanges. There is no known Lower Eocene Creodont to which it 
could belong except Paleonictis, and its ascription to any known species of 
that genus involves wide difference from Ambloctonus in size of skeleton 
relative to skull. If not Paleonictis it is an otherwise unknown Oxyenid 
or less probably an unknown Hyzenodont. 
Paleonictis occidentalis Osborn. 
Paleonictis occidentalis OsBorNn 1892, Bull. A. M. N. H., Vol. IV, p. 104, pl. iv. 
Type, No. 110, front of skull and lower jaws from the Gray Bull beds, Big Horn 
Basin, Wyoming. 
Distinctive characters: Premolars ¢ m2 small, rounded; m2 with strong metaconid, 
and small basin heel. 
The last mentioned character distinguishes the species from P. gigantea 
of the Suessonian. 
To this species I refer a number of upper and lower jaws, Nos. £5211, 
15213-6, 16178, from the Systemodon zone of the Big Horn Wasatch. The 
genus has not been found in New Mexico nor later than this zone. 
