| 
| 
66 MEMOIRS OF THE CARNEGIE MUSEUM 
that the small facet for the magnum on the proximo-radial angle is more nearly 
radially in position as in the Oligocene genus Archxotheriwm. The unciform and 
magnum apparently articulated dorsally as in the latter genus. There are other- 
wise no marked differences between these two bones in Dxodon and Dinohyus. 
MEASUREMENTS OF UNCIFORM. 
Greatest antero-posterior diameter 
fs transverse i 
ce vertical 
66 
The tibia in general resembles that of the Oligocene type rather more strongly 
than the later Miocene form. The fibula was not codssified with the tibia, although 
a rough border on the fibular side of the tibia indicates that the two bones were in 
close proximity to each other. On the anterior termination of the intertrochlear 
ridge of the distal end of the tibia is a facet, which indicates that upon extreme for- 
ward flexure of the tibia this facet articulated with a corresponding facet in the 
large pit on the anterior face of the astragalus, as in Dinohyus. ‘The general features 
of the tibia are otherwise quite similar to those in the Entelodonts generally. The 
proximal end of the tibia is wanting, as is also the external portion of the distal end, 
in the specimen here described. 
MEASUREMENTS OF TIBIA, 
Mm. 
Greatest length of the fragment 276 
‘¢ transverse diameter of shaft, medially........ 40 
is antero-posterior diameter of shaft, mediall 32 
oe ee ih Cre CIistal nen d,s 1s tsar eae » 42 
Genus DINOHYUS Peterson. 
(Plates LV-LXI.) 
In 1905 the writer sent from the field the original description of this genus to 
Dr. W. J. Holland, Director of the Carnegie Museum, who suggested the name 
Dinocherus ; the description was published in Science (78, pp. 211-212). Later 
Dinocherus was found to be preoccupied, and a note of correction by the writer 
appeared the same year in Science (79, p. 719). The skull and lower jaws were 
published in 1907 (81, pp. 49-51, Pls. XVI-X VII) and the detailed description of 
the skeleton is found on pages 77 et seq. of this memoir. 
Dinohyus hollandi Peterson. 
Type: A nearly complete skeleton. 
Horizon: Lower Miocene (Lower Harrison beds). 
Locality: Agate Spring Fossil Quarries (Quarry No. 1), Sioux County, Nebraska. 
