1885.] Eocene Period of North America. : 469 
was not opposable, a character which adds weight to those already 
mentioned which indicate that the true place of 
this genus is in the insectivorous order. The 
large patella (Fig. 15 c) shows that the genus is 
not marsupial. The head of the radius (Fig. 15 
a) is an oval, agreeing in this with the orders 
mentioned, excepting the Lemuroidea, and 
showing that the supination of the manus could 
be only imperfectly or not at all performed. 
But three species of Pelycodus are known, 
and these are confined to the Wasatch bed of 
New Mexico and Wyoming. Two species for- 
merly referred here have been separated under 
the name Chriacus and placed in the Leptictidz 
of the Creodont suborder.! 
The family of the Arctocyonide includes 
more or less.carnivorous animals with quadritu- 
berculate true molars above. The known gen- T 
ad 
era, of which there are four, possess large canine 
teeth and quadrituberculate inferior molars, 
The bones of Arctocyon have been described by V 
Lemoine, so far as known, and they are like X on 
those of Creodonta, having a flat astragalus and j) Z 
an epicondylar foramen of the humerus. Their 
quadritubercular superior molars place them in Ae 
the Insectivora as I have defined that suborder? eh 
Arctocyon primævus Blv., is a celebrated fossil of Tia pan ats ADE Seti 
the Suessonian beds of France. The single spe- = aa reagan: 
cies of Hyodectes and Heteroborus are each metapodial; 4, first, 
from the Puerco beds of France. In America Oot sash ened: > 
the family is represented by the genus Achzeno- side, and 2’, proxi- 
don Cope, of which three species are known Som Wasatch bed 
according to Osborn. The dentition is some-of New Mexico. 
what suilline in character, and Mr. Osborn has 
accordingly referred the genus fo the suilline Artiodactyla. As 
none of the bones of the skeleton are known, the question 
remains unsettled. The anterior crest of the glenoid cavity 
grasps the condyle of the lower jaw as in a carnivorous animal, 
7 
E 
V 
1 See NATURALIST, 1884, pp. 348-352- 
2 Report U. S. Geol, Survey Terrs., III, P- 739- 
