DESCRIPTION OF THE LIMBS 
7 
occupied by a deep fossa for the reception of the upper end of the radius : this fossa 
seems to be deeper than in recent forms. Beneath this fossa the anterior face of 
the ulna is concave from side to side, the concavity being bounded by sharp ridges 
which run up to the outer and inner lobes of the articulation for the humerus. On 
the whole, the radius and ulna together are very similar to those of E. africanus, 
and also to those of E. antiquus recki. 
The collection at the British Museum includes the upper half of an ulna from 
Grays as large as that now under description. This specimen has been referred to 
E. antiquus, but differs considerably from the ulna oi our specimen. Thus the 
outer lobe of the articular surface for the humerus is very small, so that probably 
the upper end of the radius was correspondingly large in order to complete the 
articular surface for the outer trochlea of the humerus, at any rate the fossa for 
the upper end of the radius is very wide. The inner lobe of the articular surface 
is very large. The dimensions of this Grays specimen (19838) and of the Upnor 
specimen are : 
Grays. 
Upnor. 
mm. 
mm. 
Width of the articular surface for the humerus 
268 
274 
Width of the outer lobe of surface for the humerus 
Length of the same (measured from the angle between it 
72 
85 
and the inner lobe) 
Width of the inner lobe of the articular surface for the 
93 
135 
humerus 
131 
n 7 
Length of ditto . . 
153 
136 
From these it will be seen that the outer lobe is much larger in the Upnor 
specimen than in 19838, while the inner is smaller. The difference in these two 
ulnae is so considerable that if the Grays specimen is correctly determined as 
E. antiquus, then the Upnor animal must belong to another species or sub-species, 
unless the range of individual variation in these bones is exceptionally great. 
The Fore-foot. 
Of the fore-foot the following bones are preserved: scaphoid (right and left), 
lunar (right and left), pisiform (left), trapezium (right and left), trapezoid (right 
and left), metacarpal I (right and left), metacarpal II (right), metacarpal III 
(right and left), metacarpal IV (left and part of right), phalanges and sesamoids. 
The Scaphoid (PI. Ill, fig. 1 a ). — In this bone the radial facet is nearly flat. 
It seems to be less inclined to the horizontal plane than in E. primigenius (PI. Ill, 
fig. i&) and E. maximus (PI. Ill, fig. ic), and is more like the corresponding surface 
in E. africanus (PI. Ill, fig. id). In outline it is about two-thirds of a rough circle, 
the chord marking the angle between it and the upper lunar facet ( ul .) ; this angle 
is a little greater than a right angle. The upper lunar facet (ul.) is nearly a 
