PETERSON: A REVISION OF THE ENTELODONTIDA 137 
mesocuneiform (fig. 80, me.), and another small one near the distal end for Mt. II. 
These are not present in Archxotheriwm ingens (the Princeton specimen). The 
distal fibular angle of the bone under description is entirely taken up by a large 
facet, which is slightly convex in all directions, and articulates with a corresponding 
facet on the palmar process of Mt. III. The bone as a whole has a great vertical 
diameter, while antero-posteriorly and transversely it is rather compressed, especially 
in the latter diameter. 
Scott (78, p. 316) has already stated that the entocuneiform has not yet been 
found in connection with Anthracotheriwm or with Entelodon. In Sus the ento- 
cuneiform is larger distally than proximally, the palmar tubercle is very prominent 
and the bone as a whole is altogether different from that in Archxotheriwm or 
Dinohyus, having a large and very prominent articular facet for Mt. II. In Hippo- 
potamus the entocuneiform is also heavier, and broader than in the latter genera. 
Mesocuneiform. —'The mesocuneiform is entirely ankylosed with the ecto- 
cuneiform, but its outline, especially on the palmar and tibial angle, is clearly 
defined (Fig. 79, Mc.). There is, however, no articular facet on the proximal end 
for the navicular as in Archxotherium and there is no facet for Mt. II, but on the 
proximal fibular angle is a facet for the entocuneiform. 
Ectocuneiform. —The ectocuneiform is of considerable size and C-shaped in 
general outline viewed distally or proximally. The entire proximal face is oceupied 
by the facet for the navicular, and the distal face is taken up by the facet for Mt. III. 
On the palmar tibial angle of the distal face is a very minute articular surface for 
Mt. II. The fibular face is very rugose back of the facet for the cuboid, which is 
located near the dorsal face and occupies the entire vertical diameter of the bone ; 
there is no facet for the cuboid on the proximo-palmar angle, as in Archwxotheriwm. 
In this respect the ectocuneiform of Dinohyus is more like that in some peccaries, 
while in Hippopotamus the ectocuneiform articulates with the cuboid only by the 
large palmar-fibular facet. The antero-posterior diameter of the facet on the distal 
face for Mt. IIT is proportionately greater than in Archxotheriwm, and, as in that 
genus, the facet is in its dorsal portion obliquely convex from side to side, and near 
the plantar region obliquely concave antero-posteriorly. The fibular border of the 
facet is deeply emarginated by a sulcus. 
MEASUREMENTS OF ECTOCUNEIFORM. 
Mm. 
Greatest antero-posterior diameter including mesocuneiform...................+ 52 
“transverse diameter. 
&e 
“c -vertical 
The general outline of the ectocuneiform of Hntelodon magnum (38, Pl. XX VII, 
