44 A POST-PLIOCENE ARTIODACTYLE ; 
than the cusps proper, its convex hinder surface culminates 
in a point or solid angle formed by the junction with that 
surface of two anterior planes, the outer of which has been 
flattened by attrition. On the inner side of the tooth a 
narrow cingulum commences at the fore end of the anterior 
cusp and ends in the middle of the talon; its edge is 
irregularly scalloped by the junction with it of ridges 
descending from the cusps, those from the anterior one 
being short, broad and two in number, those from the 
posterior one, three, but long and delicate; the highest point 
of the edge of the cingulum is opposite the interval between 
the two cusps. An outer cingulum commencing on the 
hinder part of the outer side of the hinder cusp terminated 
on the outer side of the talon, but it is for the most part 
destroyed. 
Confirmatory evidence of the alliance of this Suilline with 
the Peccaries rather than with the true pigs is given by a 
lower incisor, the middle tooth of the left side. The crown 
of this tooth is elongated, pointed, tri-lateral, and incurved, 
flat on its inner side in adaptation to the adjacent incisor, 
convex on its outer surface and more curved on the 
anterior edge of that surface than on the posterior face of 
the crown. The enamel of the outer surface descends 
much lower on the edges than in the middle, and thus 
leaves uncovered a large triangular area of dentine con- 
tinuous with that of the fang on the inner side. The 
unprotected dentine runs still higher towards the tip of the 
tooth, the enamel of the posterior face thins rapidly away 
as it descends and disappears about midway. It will be 
seen from this that the enamel clothing of the sides of the 
tooth is similar in disposition to, but less in extent, than 
that of the Peccary. The seminude condition of the hinder 
face of the crown is not repeated in Dicotyles, but even here 
there is a slight notch in the basal edge of the enamel 
which may indicate gradual extension from above. 
The outer edge of the tooth above the base is in 
Dicotyles incrassated to receive and resist the pressure 
action of the cusp of the corresponding maxillary tooth, 
which produces an emargination of its edge. The emargin- 
ation is present on a larger scale in the fossil, and evi- 
dencies a slightly concave condition of the antagonizing 
