mcnt. 



64 ODONTOGRAPHY. 



that there might be a greater number. De Blainville makes them twenty- 

 four. 



The specimens in the collection of the American Philosophical Society, 

 those of Cambridge University, various others in New York, Albany, and in 

 my private collection, support the opinion, that the number is twenty-four, 

 and no more. These we shall endeavor to point out by drawings taken 

 from my own specimens, and those of the University at Cambridge. 



Professor De Blainville assigns to Kaup the merit of having first 

 established the number of teeth in their normal succession of the Mastodon 

 Longirostris, in consequence of the discovery of the celebrated deposit at 

 Eppelsheim. 

 Develop- The teeth are not all developed at the same time, but in succession, in 



proportion to the waste of those which have preceded. At first appear two 

 small deciduous teeth, or milk molars; next follows a third tooth, also 

 deciduous, larger and more complicated than the former; then a fourth 

 tooth, of the same form as the last, though greater in size. These four 

 teeth sometimes co-exist, as in the Tetracaulodon's jaw, from the Museum 

 in New York, originally described by Dr. Godman, and afterwards more 

 particularly described and represented by Dr. Hays, in the "Transactions 

 of the American Philosophical Society," vol. iv. To the teeth already 

 mentioned succeeds a fifth tooth, of the same form as the last, but rather 

 larger. Before the appearance of this, and even in most cases before the 

 fourth tooth shows itself, one or more of the first teeth have disappeared. 

 The sixth and last tooth is much larger, and formed in a mould different 

 from any of the others. 



It is well to state here, that, in the particular description of the teeth 

 which follows, by ridge or lobe is meant an eminence extending transversely 



