118 
TERTJAEY YERTEBRATA OF THE FAYCM. 
foriuiK'ii, but tliere is a doc]) fossa lying between the condyle and the olecranon fossa (o.f.), 
wbicb also is veuy dee]). 'I’be outer condyle is coin])aratively small; from it the edge 
of the boM(' is continued u]) as a narrow backwardly directed flange, which dies away 
just below tlu' middle of tbe shaft; distally this ridge forms the outer border of the 
olecranon fossa, and higlmr np the sharp outer border of the expanded distal end of 
the bone, wbicb above the olecranon fossa is strongly concave from side to side. Tbe 
edge also is in j^art the ecjuivalcnt of the supinator ridge, and the large development 
of this and of the inner condyle indicates that the limb was ca])able of extensive 
movements of ]>ronation and su])ination not found in the more specialised Ungulates. 
The distal articulation is divided into an outer and an inner lobe by a shallow 
dc])ression ; above the outer trochlea the front of the bone is occupied by a well- 
marked coronoid fossa (c.f.). 
The ])roximalend only of the ulna is known (PI. XI. fg. 7). The olecranon process 
(ol.) is large, thickened at the extremity, and rises high above the articidatiou ; it is not 
directed backwards to any great extent, but merely continues u})wards the long axis 
of the shaft. The sigmoid notch is dee])ly concave, the up])cr part of the articulation 
being considerably prolonged forwards. The lower ])()rtion of the humeral surface is 
deeply bilobate ; the radius seems to have been in contact with the outer lobe only. 
Beneath the articulation on the anterior face of the bone towards the outer side there 
is a deep depression (r.) for the radius. 
I/ind JAnih . — The (PI. XI. figs. 9, 9 A; text-fig. G8, ])) differs widely from 
that of the later Proboscidca, owing mainly to the narrowness of the ilium. The 
crista itii (c.i.) is short and almost at right angles to the sacral and acetabular 
borders, which are ])arallel with one another. The outer angle of the crista forms a 
blunt projection. Tlie sacral surface is very long, extending over the anterior three- 
fourths of the sacral border ; it is gently convex from above downwards, and from its 
position and antero-])osterior extent it shows that the long axis of the ilium is nearly 
parallel with that of tlie vertebral column. The acetabular border is gently concave 
in its anterior two-thirds ; posteriorly it seems to divide on either side a strongly 
marked pit for the rectus femoris muscle) lying immediately above and in front 
of the rim of the acetabulnm. The gluteal surface is slightly concave from 
side to side ; the ])elvic (inner) surface is nearly flat. On the ventro-internal face 
of the ilium is a ])romincnce (ileo-pectineal), from which there runs back a ridge 
continuous with the anterior border of the ]uibis (^i/n). 'Plie acctalndum (a.) is 
horseshoe-shaped, the very ])romincnt raised rim Ix'ing iuterru])ted ])ostero-inferiorly 
by a wide notcli, which leads into the large ])it for the ligament, and opens 
externally on the surface of the ischium, 'llio j/uhis is for the most ])art broken 
away in all tbe sjiecimens examined : this sc'cms to be the consecjuencc of the 
slendei uess of the free portion of this bone. 'I'he ischiuni (/.s.) is much stouter and 
