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JOURNAL OF MAMMALOGY 
spacing. The opposing series of the two jaws interlock, with the points of the 
teeth directed outward, those of the more posterior slightly recurved. A longi- 
tudinal crack appears in the mandible, evidently due to crushing. The photo- 
graph shows very clearly that the teeth had distinct crowns, doubtless of enamel, 
which stand out dark and discolored in contrast to the white of the exposed roots. 
Eleven maxillary teeth are apparent in the figure and at least ten mandibular 
“teeth (Plate 12, fig. 13). 
(2) The second fragment is from Brewster, Polk County (15751 M.C.Z.), the 
gift of Dr. Thomas Barbour. It is a section, some 150 mm. long, of the conjoined 
mandibles beginning slightly in advance of the symphysis. At the posterior end 
the rami are separate for about 20 mm. ; in front of this point they begin to con- 
tract slightly in width and are thoroughly fused together with the line of contact 
deeply impressed. Three complete alveoli with parts of two others are present 
in each ramus. The posteriormost on the right side is the smallest. It contains 
a root still in place and is separated by a narrow interval from the alveolus next 
in advance. The three succeeding alveoli are about of the same size with inter- 
spaces greater than those separating the alveoli of the left side. From this it 
results that the corresponding sockets of opposite sides are not in the same trans- 
verse plane, but alternate with the opposite interspaces. The lengths of these 
sockets and interspaces are: 
Left ramus Right ramus 
Proximal socket — 18 
First interspace : 10 2 
Second socket 22.5 20 
Second interspace 9.5 12 
Third socket 20 22 
Third interspace 8 15 
Fourth socket 20 20 
Fourth interspace 15 =t 16 
Combined length of middle three sockets.. 78 90 
A slight asymmetry is thus evident in the rami of opposite sides. 
The two roots still in place are broken off at the level of the jaw and are nearly 
oval in section, with the longest transverse diameter turned outward and for- 
ward in the posteriormost but nearly parallel with the tooth row in the anterior- 
most tooth. In side view are seen several short and shallow depressions in the 
rami marking the exit of the mental nerves. About halfway up on the ramus 
a very shallow longitudinal groove is evident, beginning from the most proximal 
of these exits just in front of the symphysis. 
(3) The third fragment referred to this species is a portion of the base of a 
skull from Mulberry, comprising the occipital condyles (15787 M.C.Z.). These 
are prominent and rounded, though but slightly marked off from the occipital 
surface by a raised border. Their greatest vertical diameter is very nearly at 
right angles to the transverse plane of the skull, and the greatest width is at 
about the middle point of their height. In measurements they are practically 
identical with those recorded by Moreno for D. poucheti. 
