142 



grinding surface, which is six inches in length, presents fourteen plates, 

 but the anterior ones have been worn away and the common supporting 

 base of the dentine is there exposed : the posterior and largest fang is 

 considerably elongated : the external cement is partially decomposed and 

 separated from the lamelliform divisions of the crown. 



Locality unrecorded. Hunterian. 



591. A lower molar of a Mammoth, much worn by mastication. The anterior 



plates and the fang supporting them are both gone ; four or five of the 

 succeeding plates are worn down to their common uniting base of dentine, 

 and the undulating course of the enamel is there shown ; the eight re- 

 maining distinct lamellar processes are much bent transversely, with the 

 concavity directed backwards : the whole of the crown here remaining is 

 supported by a long, compressed triangular fang. 



Locality unrecorded. Hunterian. 



592. The lower molar of a Mammoth, much worn by mastication. The 



common dentinal base of four or five of the transverse plates of the an- 

 terior part of the grinding surface is exposed. The hinder plates are 

 bent transversely with their concavity directed backwards. The large 

 posterior conical fang offers the degree of development which accompanies 

 the abraded state of the crown ; it is longitudinally grooved at the sides, 

 the grooves corresponding with the intervals of the plates above ; it is 

 also traversed by parallel transverse grooves and ridges. 



Locality unrecorded. Hunterian. 



593. A lower molar of a Mammoth, much worn by mastication. The whole 



of the enamel has been abraded from the anterior part of the grinding sur- 

 face, which presents a smooth concavity of ivory, unfit for the attrition of 

 coarse vegetable substances ; at the back part of the tooth some irregular 

 transverse ridges formed by the inferior extremities of the descending 

 folds of the enamel still remain. The base of the tooth is prolonged 

 into a compressed obtuse conical fang. 



From the upper tertiary formations of Ohio, North America. 



Purchased. 

 593 1 . A corresponding molar of an Indian Elephant in a similar state of attri- 

 tion. Purchased. 



