PETERSON: A REVISION OF THE ENTELODONTIDA 121 
broadly developed. This is due to the fact that the extension of the superior 
border articulates with the scaphoid, while the inferior border articulates with Me. 
IIL in Dinohyus. The articulation for the trapezoid is also relatively smaller and 
reduced to two facets, a small superior and a larger inferior, while in Archeotheriwm 
there are three facets, one superior and two inferior. The palmar process is com- 
pressed laterally, but attains a considerable vertical diameter, reaching the lunar 
above and articulating with it by a beak-like process referred to above. The position 
of the palmar process is oblique and the shape is thus very different from what ap- 
pears in the Princeton specimen, described by Professor Scott (87, p. 306), which has 
a more rounded palmar process. he head of the magnum rises more abruptly 
toward the palmar side in Dinohyus than in the Oligocene genus, which Scott used 
for his comparison with thé European form. In the latter Scott says “the head of 
the magnum rises less abruptly toward the palmar side.” In Hippopotamus the 
palmar hook is even more prominent, but is placed more transversely and is ex- 
tended more downward than in Dinohyus. Distally there is in the latter genus only 
one articulation, that for the third metacarpal. It is concave antero-posteriorly 
and convex laterally. The antero-posterior diameter of the facet is proportionally 
greater than in Archeotheriwm ingens. 
The magnum of Enielodon figured by Kowalevsky (88, Pl. XXVI, figs. 21, 23, 
29-32) is, as Scott has stated (87, 306), generally similar to that in the American 
genera, but there are a number of minor differences. ‘The facet for the scaphoid in 
the European genus is less horizontal; the facet for the lunar is more oval in form 
and is not continued outward on the palmar hook; the articulation for the trape- 
zoid is relatively larger and is in a different position, 7. ¢, near the dorsal face and 
also at the palmo-distal angle of the bone. he palmar process is relativel y as large 
as in Dinohyus, but different in shape, being more rounded. ‘The sulcus, which on 
the distal ulnar face separates the lunar facet, is very much smaller than in Dinohyus. 
MEASUREMENTS. 
Magnum, greatest antero-posterior diameter. 
a Bs transverse ‘© posteriorly 47 
be Me a «¢ anteriorly 
2 Be vertical RETURNS cae ede cckruirheduoneh caer ENTS 58 
bs We ue Ot) ANUCIVOL ya vnkn rove seuan cw saue Pees Te 31 
Unciform. —The greatest antero-posterior and transverse diameters of the unci- 
form are very nearly equal. The bone asa whole is massive, and is, asin Bodchwrus 
humerosus, the second largest bone of the carpus. Its anterior face is rugose and 
unevenly convex transversely. Posteriorly there is a palmar hook not unlike that 
