. 9()\'7 
CORYPHODON, OK LOPHLODON. 30/ 
jaw: the summit of the crown has been abraded, and the 
posterior part (¢) excavated by the action of the su- 
perior canine upon it, during the lifetime of the animal. 
The general proportions of this tooth, its degree of cur- 
vature, and the relative length of the crown and the fang, 
accord pretty closely with those of the canines of different 
species of Lophiodon figured by Cuvier in the ‘ Ossemens 
Fossiles,’ 1822, tom. ii. pt. 1. pl. x., figs. 3 and 12. pl. ix., 
fig. 11. The crown must have projected but a small dis- 
tance beyond that of the adjoiming teeth, and have been 
quite concealed by the lips, as in the Tapir, not forming 
a projecting tusk, and being shorter and thicker than the 
canine of a carnivorous quadruped. Like the canine of 
the Lophiodon tapiroides in pl. ix. of the volume cited, the 
growth of the present tooth was completed and the fang 
terminated by an obtuse solid extremity: but it differs 
in the fang being less expanded ; it is at no part so thick 
as the base of the enamelled crown: in this respect it 
resembles more the canine of the Lophiodon medius, tom. 
cit., pl. x. fig. 12, but the crown of the present tooth is 
proportionally more expanded at the base. The propor- 
tions of the crown more nearly resemble those in the Lo- 
phiodon Isselanus, pl. x. fig. 3; but the fang is ventricose in 
that species, as in the Lophiodon tapiroides. Cuvier does 
not give a figure of the transverse section of the crown of 
the canine in any of his specimens: that of the present 
tooth, (fig. 105, c) is very characteristic, and resembles the 
transverse section of the crown of the teeth of the great 
extinct reptile called Pliosaurus ; the outer surface being 
nearly flat, and the rest of the crown so convex as to de- 
seribe a semicircle: a ridge of enamel along each border of 
the flattened side separates it from the convex side of the 
crown. The Mammalian nature of the tooth is established 
5 Ye 
