42 
TKRTIAliY YEKTEI5RATA OF THE FAYOAI. 
tlio upper e(l”o of the lunar. The distal end is occupied by a greatly elongated 
articular surface {tz.), slightly convex in all directions, which probably articulated with 
both the tra])eziutu and trapezoid, Anteriorly the outer (postaxial) border of this 
surface is connected with two other facets, of which the anterior one (/.') is a flat 
elongated surface looking outwards and downwards for union with the lower facet of 
the lunar, while the other {mag.) lying iinniediately behind the last is triangular in 
outline, and looks downwards and l)ackwards, and apparently united with the postero- 
internal angle of the upper surface of the magnum, as is the case in Eleplias. Both the 
outer and inner faces of the bone, where not occupied by articular facets, are greatly 
roughened and pitted. 
The form of scaphoid here described and figured is definitely known to be that 
Right lunar of Arsiitoklterium zitteli: A, from above; B, from front ; C, scaphoid face, 
mm/., facet for magnum ; r., surface for radius ; sr., sc.', upper and lower .surfaces for siaiphoid ; 
O'.?, facet for trapezoid ; a., surface for ulna. ^ uat. size. 
of Arsmoitherium, but at the same time it is very like that of Elephas, and its 
relations to the neighbouring bones, so far as determinable, are similar. This scaphoid 
differs from that of Eleph.as in the following respects : — (1) its proximal articular 
surface is concave, owing to the stronger convexity of the portion of the radial head 
with wliich it articulates ; (2) the lower surface for the lunar is shorter from before 
backwards and at the same time deeper ; (d) the distal articulation is much longer from 
before backwards, extending considerably behind the triangular surface for the magnum ; 
the whole distal end of the bone is, in fact, much more expanded than in Elephas. 
The lunar (text-fig. 21) here described is ])resumed to belong to Arslnoitherium, 
