56 ODONTOGRAPHY. 



although two of the heads belonged to animals which must have been 

 from thirty to forty years old. 



We shall now examine the series of these teeth by means of different 

 specimens. 

 Teeth of There is in my possession the head of a calf-elephant, which died pro- 



Calf Ele- 

 phant, bably soon after birth. The teeth in this head are in the following condition : 



At the anterior part of the upper maxillary bone, behind the intermaxillary, 

 a tooth, measuring six-eighths of an inch antero-posteriorly by five-eighths 

 transversely, is discovered pressing hard upon the gum, as if ready to per- 

 forate it. Behind this is a second tooth, entirely buried in the bone, 

 measuring two inches and three quarters in length, and consisting of seven 

 plates partially cemented together, but not very firmly : the fangs are not 

 formed. A considerable cavity exists posteriorly, containing a number of 

 plates destined to form a third tooth. 



Third In the jaw of an Asiatic Elephant, about five years old, given me by 



Dr. Winslow Lewis, the first and second teeth have disappeared ; and the 

 third, measuring four inches and one quarter antero-posteriorly, is in place, 

 rather worn, in which there are eleven plates. There is also, posterior to the 

 last, a fourth tooth, destined apparently to be of greater size ; for, though 

 no part of the crown is fully formed, it is nearly an inch longer than the 

 last named. , 



In the jaw of another animal, which I believe to have been about six 

 years old, is a tooth from which the anterior part has been worn away, con- 

 taining eleven perfect ridges, or lamina?, and two imperfect from having 

 been worn, measuring five inches and three quarters antero-posteriorly. 



Fourth This is undoubtedly the tooth described as undeveloped in the preceding 



Tooth. 



jaw. Behind this, principally imbedded in the bone, five of its anterior 



