IN THE TEETH OF MAMMALS. 67 



numerous memoirs or treatises on the development of the teeth 

 which have appeared of late. It is believed, however, that as yet 

 it has not been recorded that the enamel of the elephant's molar, as 

 also that of the mastodon's, presents the very same decussating- 

 arrangement of the inner portion of its enamel which Mr. Tomes 

 has figured ( f Phil. Trans./ 1850, pi. xliv, xlv, xlvi), as noted by 

 him in the Rodentia, less the Leporidae and Hystricidae. Thus 

 the rodent affinities of the elephant, which have so often been com- 

 mented upon, receive a fresh illustration. 





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