231 



965. The fourth molar, right side, upper jaw, of a species of Equus : this tooth, 



in its proportions and in the plications of its enamel, resembles the cor- 

 responding tooth of the recent Horse. 



966. The last molar, right side, upper jaw, of a species of Equus : it has been 



nearly worn down to the root, whereby part of the central inflected folds 

 of enamel are obliterated, and the common dentinal base is exposed. 



96/- The first molar, left side, upper jaw, of a species of Equus. The enamel 

 surrounding the central islands of cement, and especially the anterior 

 one, has more complicated foldings than in the recent Horse, and the 

 anterior angle of the crown is less produced. 



968. The second or third molar, left side, upper jaw, of a species of Equus. 

 The central isles of enamel are rather more plicated, but the whole crown 

 has its antero-posterior extent longer in proportion to its transverse 

 diameter than in the recent Horse's tooth compared. 



969. The fifth molar, left side, upper jaw, of a species of Equus : this tooth 

 agrees both in form and disposition of the enamel with the corresponding 

 tooth in the recent Horse. 



970. The last molar, left side, upper jaw, of a species of Equus. It differs 



from the corresponding tooth of the recent Horse in a deeper inflection 

 of the posterior longitudinal fold of enamel, which gives a biiobed ter- 

 mination to the grinding surface of the tooth at that part : the posterior 

 internal angle of the second enamel island is also detached and forms a 

 separate cylinder in the fossil. 



971 . The first or mid-incisor of the right side, lower jaw, of a species of Equus. 



972. The first or mid-incisor of the left side, lower jaw, of a species of Equus. 



These teeth are apparently from the same individual ; the central in- 



fleeted cone of enamel or ' mark' has been worn to the bottom in both. 



9/3. 



The first or mid-incisor of the left side, lower jaw, of a species of Equus : 

 the crown has been worn down to the fang and the mark obliterated, 

 showing it to have belonged to an c aged' individual. 



974. The third or outer incisor, right side, upper jaw, of a species of Equus. 



