56. : Bulletin American Museum of Natural History. [Vol. XXXIV, 
The specimen consists of complete pelvis, hind limbs and feet, lumbar 
and caudal vertebrae, fragments of the fore limbs and parts of fore feet, 
anterior part of lower jaws, fragments of upper teeth and lower molars. 
With this individual were associ- 
ated parts of hind limbs of two 
other individuals of the same 
species, a jaw and a few frag- 
ments of skeleton of Sinopa. 
The scaphoid, centrale, mag- 
num, unciform, trapezoid, trape- 
zium cuneiform and pisiform are 
preserved in the carpus. The 
centrale lies beneath the scaphoid, 
completely separating the trape- 
zoid from it; dorsally the centrale 
projects beneath the lunar as well. 
The articulation between centrale 
and scaphoid is rugose, foreshad- 
owing the union of these two 
bones; the lunar-scaphoid facet is 
. also but less clearly of the same 
Fig. 49. Ozxyena pardalis, lower teeth, p4—me character. The unciform is about 
inner, crown and outer views, natural size. No. ; : . 
15608, Lysite beds, Big Horn Basin. the same in height as in breadth, 
and has.a broad lunar articula- 
tion, not distinct from that for the cuneiform except dorsally. The magnum 
is small, with narrow proximal keel, small dorsal surface. The trapezium is 
large, with a proximal internal peg extending beneath the trapezoid; its 
facet for me.I is large, but nearly flat. - 
The femur has a third trochanter, rather obscure; the shaft is bowed 
outwardly, considerably flattened and ridged on the external border both 
above and below the trochanter. The tibia is one-fifth shorter than the 
femur, the cnemial crest is very slight, the internal malleolus thick and 
massive, the trochlea nearly flat and very oblique. 
The astragalus has a broad, nearly flat trochlea, the inner crest obscure, 
the outer crest a sharp ridge with a solid angle of 90° separating the trochlea 
from the fibular facet. The fore and aft motion of the tibia on the astraga- 
lus is quite narrowly limited by the astragalar foramen behind, and the neck 
of the astragalus in front. At the front of the trochlea the facet is sharply 
curved upwards to receive the front of the tibia in flexion, and on the inner 
slope of the neck is a well defined facet for the internal malleolus n flexion. 
The neck is very oblique, the head broad and flat. The navicu ar is wide, 
