= 
86 MEMOIRS OF THE CARNEGIE MUSEUM 
cusps of Mz are well united and apparently not developed independently, as in 
young titanotheres.* The posterior portion of M; is not represented at all, as the 
tooth is too young. 
The jaw fragment was somewhat worn by the elements before it was finally 
imbedded in the bone-bearing layer of the quarry. The coronoid process is, how- 
ever, complete, and is low and broad antero-posteriorly. The condyle is on a hori- 
zontal line with the alveolar border and the angle is seen to project quite strongly 
downward below the ventral border of the jaw. ‘The dental foramen is very large 
and is situated immediately in front of, and below, the condyle. The temporal fossa 
is high and very shallow. 
An isolated upper tooth, which was found in the A gate Spring Fossil Quarries 
(Quarry No. 1) by Mr. Harold J. Cook and presented to the writer for publication, 
appears to be a deciduous upper premolar (dP) of the right side (fig. 83). This 
tooth is surprisingly similar to an upper tooth of a car- 
nivore (canid) and was so regarded by the writer for some 
time. Dr. W. D. Matthew kindly made a systematic 
comparison with the material in the large collection of 
the American Museum and suggested that it was per- 
haps a deciduous tooth of an Entelodont. The addi- 
tional material secured in the Agate Spring Quarries 
Fa. 33. Crown View of Deciduous 
bee erllk hashish tne eoEng the season of 1908 enables us to Cen deter- 
size. (Harold Cook’s Collection.) | ™Mine this tooth and it is here illustrated in order to 
assist the student. The chief peculiarity of this tooth is 
that instead of having three cusps on the posterior portion of the crown, as the tooth 
described above, it has only two, and in this respect agrees better with the tooth of 
Archxotherium described by Scott (87, p. 276). The portion of the posterior root 
which remains unbroken is abruptly pointed and short, haying characters one 
would expect to find in a milk-tooth. 
MEASUREMENTS. 
THe SKULL. 
(Plates LV-LVIII.) 
The orbits in the cranium of Dinohyus are so placed that the eye looked directly 
forward in an unusual manner (see Plates LVI, LX, and LXI). The eye is located 
Hatcher, Annals Carnegie Museum, Vol. 1, pp. 260-261, 1901. 
