3/0 MEMOIRS OF THE CARNEGIE MUSEUM. 
posteriorly and quite plane transversely. The facet for the cuboid on the fibular 
face is well formed, long antero-posteriorly, quite shallow vertically, with its 
articulating surface curved” in order to conform to a similarly curved surface on 
the cuboid already described. Below the articular surface near the plantar face 
is a prominent excavation (Fig. 102, 5) which is directly opposite a similar exca- 
vation on the cuboid and causes a deep cavity 
to be formed on the plantar face of the tarsus 
when the bones are in position. On the tibial 
face are three facets, a dorsal and a plantar, 
which articulate with Mt. IV; the third is 
longer and narrower and situated near the 
Fic. 102. Ectocuneiform of the right foot proximal angle, articulating with the mesocu- 
of M. elatus (No. 1706A). X%. 1, anterior neiform. The plantar face is principally taken 
] *9 tihi 5 7 1 . Bs, ° i bd 3 
BOT INI STREIe |S) POSEN WISH, TeVe up by a prominent tuberosity. Distally the 
rior view; 5, fibular surface; 6, inferior surface. 
articulation for Mt. III is triangular in out 
line, irregularly, but gently, convex and concave. 
MEASUREMENTS OF ECTOCUNEIFORM. 
No. 1706a No. 1701 
(M. elatus), (M. petersoni), 
mm. mm. 
Antero=posterior ‘diameter ss ssc ane ee See eon ne aa ee eae 60 45 
Transverse diameter 2... wets cot a ee eh ae ee eae 45 34 
‘Vierticall diameters. .h 8 rr ete se ecko is oe 10 12 
Mesocunetform (Fig. 103).—The mesocuneiform is much reduced; it is some- 
what more reduced than in Titanotherium and has a slightly greater vertical 
diameter than in the latter. The dorsal face is very small 
and triangular in outline. The tibial face is rugose and quite 
extensive, the bone having a considerable anteroposterior 
diameter. The plantar face is broader than the dorsal, and 
there is a small round facet for the entocuneiform on the 
tibial plantar angle. The facet for the navicular is oblong 
4 
Fic. 103. Left mesocu- 
. : neiform of M. petersoni (No. 
in outline, concave antero-posteriorly, and also slightly con- 1813). x}. 1, fibular view; 
cave laterally. The fibular face has a long narrow facet for 2, tibial view; 3, superior 
the ectocuneiform. Distally there is one large facet for YW? * inferior view. 
Mt. IV, which is triangular in general outline, and unevenly concave and convex. 
Entocuneiform.—A characteristic feature of Moropus is the obsolescence of 
the entocuneiform as in Titanotherium. In our material prepared for study there 
” This surface is sometimes interrupted so as to form a facet in front and behind. 
