226 PROBOSCIDIA. 
have yet seen, measured fifteen inches in length, and had 
twenty-two coronal plates: it was discovered in the drift 
at Wellsborne in Warwickshire. | Mammoths’ molars 
of less dimensions have come under my observation, im 
which the crown had been divided into twenty-five and 
twenty-six transverse plates. 
In the lower jaw, the grinders as they succeed one another 
from behind forwards are also larger, and have more nume- 
rous plates than those which they displace, and the number 
of plates increases more gradually and with less constancy 
than in the Asiatic Elephant. 
A lower molar of the Mammoth may always be dis- 
tinguished from an upper molar, by the grinding surface 
being slightly concave in the direction of its longest dia- 
meter, that of the upper molar beg in the same degree 
convex. 
The largest lower molar of a Mammoth that has come 
under my observation, is the one represented in fig. 90: its 
length, or antero-posterior diameter, following the curve on 
the convex side is one foot seven inches: the number of the 
lamelliform divisions of the crown is twenty-eight. This re- 
markably fine molar exhibits the most complete state in 
which the progressive development and the actions of masti- 
cation permit so large a grinder to be seen: the anterior 
portion of the crown haying been worn down to the common 
base of dentine (d’), from which the fang is continued; whilst 
the last, or hindmost plates, have been completed, as far 
as the formation of the digital divisions (f, f), which form, 
by their basal confluence, the transverse plate. 
The complex structure, and mode of growth of the molar 
teeth mm the genus Elephas is so well illustrated by this 
specimen, that I shall here give the brief account which is 
necessary for the intelligibility of subsequent references to 
