LARGE FOSSIL 
of the inner division of 
the two lobes, which I 
have not found in the cor- 
responding tooth of the 
recent species. The last 
lower molar, m 3, which 
is characterized by a 
third accessory lobe, has 
a longer antero-posterior 
diameter in comparison 
with its transverse than in 
the recent species; but 
the agreement in the size 
and shape of the molar 
teeth is very close. 
The antero-posterior 
diameter of the base of 
the crown of this tooth is 
one inch six lines (‘0039 
millimetres). 
The antero-posterior 
diameter of the last molar 
of the Hippopotamus major 
from Walton is three 
inches three lines; the 
transverse diameter of 
the base of the first: lobe 
one inch and a half. 
HIPPOPOTAMUS. 4.09 
Fig. 162. 
Lower jaw of Hippopotamus major, % nat. 
size ; fresh-water clay-beds. Cromer, 
Norfolk.* 
The great straight incisive tusk of the lower jaw is 
commonly found in a state of decomposition, with the 
ivory separating into a series of superimposed cones. In 
* In this figure, the incisive tusk, 7,is drawn too much inclined outwards ; it 
should be parallel with the molar series. 
