LARGE FOSSIL HIPPOPOTAMUS. 



409 



Fig. 162. 



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. 



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 



Lower jaw of Hippopotamus major, nat. 

 size ; fresh-water clay-beds. Cromer, 

 Norfolk.* 



* In this figure, the incisive tusk, f, is drawn too much inclined outwards ; it 

 should be parallel with the molar series. 



