HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 233 
The general shape of the carpus is similar to that in Macrotherium, but is not 
nearly so heavy. On the ulnar side of the scaphoid, at the distal end, is a heavy 
and rounded process, which reaches over in the ulnar direction and articulates with 
the superior face of the magnum as in Macrothervum. 
The articulation for the scaphoid on the magnum is, however, more lateral in 
Macrotherium than in the species under consideration. The unciform has a heavy 
projection on the dorso-radial angle, which extends upward and radially over 
the ulnar border of the magnum. This character of the unciform is quite like what 
is found in the European form from Pikermi, but not like what is seen in Macro- 
thervum from Sansan, according to the illustrations which have been given." 
Some of the distinguishing characters of the fore foot of this species are: the 
much reduced facet for the trapezium on the scaphoid and Mc. JI (see Fig. 12, 1), 
which may even be absent; the great downward deflection of the facet for the 
scaphoid on the radial face of the bone, plainly indicating the presence of a trape- 
zium, though its articular surface does not extend to the margin of the articulation 
for Mc. II as in M. elatus and M. petersoni, and was therefore undoubtedly reduced 
in size, and did not touch Mc. II, as in the latter species. The trapezoid has not 
the heavy protuberance on the dorso-radial angle seen in M. elatus and M. petersoni 
(see Figs. 11 and 12), and the articular face for the trapezium does not extend down 
to the articulation for Mc. IJ as in these species. Mc. IT is 
' proportionally longer and slenderer than in M. elatus or M. 
peterson. Upon more accurate measurements and comparison 
with the cast of Mc. IIT of Macrotherium grande of Sansan 
this bone in the present species is seen to be longer and slen- 
derer, though Peterson stated in the original description (J. c.) 
that Mc. II in the two specimens were of nearly the same pre 43. Coissified 
length. The distal ends of Mc. JII and IV are unfortunately proximal and median 
broken off and their length cannot be ascertained from the phalanges of left digit IT 
type. Mc. V was present, as is plainly indicated by a facet on ae e er 
the ulnar face of Mc. IV. The codssified first and second pha- See. 2, Tee sai 
langes of the second digit of the manus are present and show 
plainly a comparatively greater lateral compression than is shown by the duplex 
bone in either M. elatus or M. petersoni (see Fig. 13). 
The head of the femur rests on a very short neck and the great trochanter 
16 Since the original description in the Annals (J. c.) was published the Carnegie Museum has obtained 
casts of these various European types. The unciform of Macrotherium is not represented and apparently is 
not known, but was supplied in the published illustration, referred to. 
