534 UNGULATES. 



the island of the anterior lobe (e) — presents a small accessory 

 fold at the inner side of its posterior horn : in the posterior 

 lobe the fold is represented by a small circular island of enamel (e") 

 both are soon obliterated as the tooth wears down. There is an 

 accessory column at the internal interspace of the lobes in Alces 

 as in Megaceros, which is not present in the Rein-deer or Fallow- 

 deer, but it is rudimental and confined to the base of the fissure. 

 The anterior border of the outer concavity of each lobe is unusually 

 produced. 



In the Giraife (fig. 7) the median convexity of the outer 

 surface of the anterior lobe (o) is more prominent than the 

 anterior border of the depression from which it rises, whilst 

 the anterior border of the posterior lobe (o*) is more produced 

 than the middle prominence : this distinctive character is well 

 shown in the upper molars of the fossil Giraffe from the Sewalik 

 Hills, noticed by Captain Cautley in the ' Journal of the Asiatic 

 Society of Bengal,' Vol. vii, pp. 658-660, and figured in 

 his joint communication with Dr. Falconer, in the * Proceedings 

 of the Geological Society,' No. 98, PI. 2, fig. 3 & 4; the last 

 and penultimate molars are specifically distinguished by an obtuse 

 lobe at the bottom of the outer interspace of the two lobes. 

 The crescentic enamel folds are continued into each other until 

 the tooth is worn low down ; but their outer boundaries are earlier 

 completed than in the Elk : the two principal lobes are divided 

 almost to the base of the crown : the internal column is reduced 

 to a very small basal rudiment. The enamel of the Giraffe's 

 molars is unusually rugose and resembles that of the Sivatherium. 



The molars of the Camel (fig. 8), present the most simple con- 

 dition of the ruminant type of these teeth : the transverse fold 

 dividing the crown being short, the dentine of the two lobes forms a 

 continuous tract : the common base of the crescentic vertical folds 

 of the capsule being likewise short, the enamel islands are soon 

 separated from each other : they include a shallow or narrow 

 crescentic cavity, with a simple but slightly sinuous contour. The 

 two outer shallow longitudinal depressions of the crown (o c) have no 

 middle rising ; and there is no columnar process at the interspace 



