29 



upper premolar is represented in Fig. 5, Plate V ; a fragment of a second 

 upper molar in Fig. 6, Plate XXIII, and t\\ o lower premolars and a molar 

 in Figs. 3 to 5, of the same plate. The teeth apparently all belonged to the 

 same individual, which had reached maturity, but had not advanced so far as 

 to have the summits of the tooth-lobes worn through so as to expose the 

 dentine. The enamel is longitudinally wrinkled on the sides of the true 

 molars and in a less degree on the premolars. m • 



The last upper premolar (Fig. 5, Plate V) has a trilolate crown consisting 

 of an outer pair of acute pyramidal lobes, and an inner larger conical lobe 

 embraced by a basal ridge in front and behind. 



The fragment of an upper molar (Fig. 6, Plate XXIII) consists of the fore 

 part of the crown, and is composed of an outer crescentoid pyramidal lobe 

 and an inner smaller conical lobe. A strong convex buttress forms the antero- 

 external angle of the crown, and a moderate basal ridge bounds it in front. 

 A conspicuous tubercle, the rudiment of an additional lobe, occupies the angu- 

 lar interval between the principal lobes and the basal ridge. 



The lower molar tooth (Fig. 5) has a fore and aft bilobed crown as in 

 Palaeotherium and Titanotherium. The lobes are crescentoid pyramidal, and 

 the anterior is the smaller. 



The lower premolars have the same essential constitution as the true molar, 

 but are less well developed. In the fourth premolar (Fig. 4) the relative size 

 of the lobes is reversed, the anterior being the larger, and the postero-internal 

 buttress of the crown is obsolete. In the third premolar (Fig. 3) the poste- 

 rior lobe is still more reduced in size, the anterior lobe is proportionately 

 enlarged, and the inner buttresses of the crown arc obsolete. 



The measurements of the specimens are as follows : 



Lines. 



Fore and aft diameter of second upper molar, estimated 17 



Transverse diameter of second upper molar IS 



Fore and aft diameter of last upper premolar 9£ 



Trausverse diameter of last upper premolar 113 



Fore and aft diameter of second lower molar 1G 



Trausverse diameter of secoud lower molar 10 



Fore and aft diameter of fourth lower premolar 9£ 



Trausverse diameter of fourth lower premolar CJ 



Fore and aft diameter of third lower premolar . . 8£ 



Trausverse diameter of third lower premolar. ..... 5 



Shortly after the original description of the above specimens, several others 



