120 MEMOIRS OF THE CARNEGIE MUSEUM 
Between the proximal and distal facets the surface of the bone is very slightly 
excavated while the corresponding face on the magnum is very deeply excavated, 
forming a large sinus. MRadially there is but one small facet: that for the 
rudimentary Me. II (see fig. 72). This facet is situated near the dorsal face and 
has a radial position, while that in Archxothe- 
rium described by Professor Scott (87, p. 305) 
is directly on the distal face. There is no facet 
for the trapezium, while in Archxotheriwm the 
facet is quite plain and the trapezium is present. 
In the European genus Hntelodon the trap- 
Fig. 72. Radial and Palmar Views of Magnum €ZOid is not known, which is also true of Anthra- 
with Trapezoid in Position. } nat. size. (Carn. ¢otheriwm. 
Voted oak Nara pater The trapezoid in Sus and also in Hippo- 
potamus is relatively large; it has more functional importance in the make-up of 
the carpus, and can hardly be compared with the rudimentary form, which the bone 
possesses in the Mntelodontidx. 
MEASUREMENTS. 
Mm 
DURD OZOIG {ANtELO-POSPELIOM, CIATTOUCLEY dscc.decazsesyoseseitsesoncovent01VacetisdsadtsyuwVersosscuesd pie 28 
it transverse se 
ee vertical we 
Magnwm. — Proximally there are two oblique facets on the magnum: an 
antero-radial for the scaphoid; and a postero-ulnar for the lunar. The former 
facet is concave from side to side and conyexo-concave from before backward. The 
latter facet is convex antero-posteriorly and concave on the postero-ulnar angle 
presenting a sinuous surface, which terminates behind in a beak-like process on the 
proximo-ulnar angle of the palmar process. In Archxotheriwm the palmar process 
is placed more distally and has not an upward recurved beak, as in the present 
genus. The facet for the scaphoid is relatively broader and more concave on the 
ulnar angle than in the Princeton specimen. The facet for the lunar has a propor- 
tionally smaller transverse diameter than in Archwotheriwm and the dorsal contact 
with the lunar is entirely lateral and concave supero-inferiorly, while in Archxo- 
theriwm it is convex in order to receive the concave facet of the lunar, as stated 
above. The ulnar side has two deeply excavated areas; one of large size in front, 
and one smaller, back of a broad obliquely located ridge, which terminates above in 
the lateral facet for the unciform. This ridge is much less developed in Archixo- 
theriwm. The groove for the trapezoid seen in the latter genus is less clearly defined 
in its vertical portion in Dinohyus, while in the antero-posterior direction it is 
