166 JYotices of Big-hone Lick. 



Left upper jaw, with part of socket of tusk, and two molars. 

 Right upper jaw, with one molar, and an empty socket. 

 Right upper jaw, with one molar, from a young individual. 

 Left upper jaw, with one molar, still younger. 

 Right upper jaw, with one molar, no empty socket, the enamel 

 whitish. 



Right and left lower maxillary hones, each with the posterior 

 molar, which is a little worn, perhaps belonging to one jaw. 



Chin of a young individual, with a short truncated beak, in 

 which are the vestiges of sockets of caducous incisors, . 

 (similar to the tetracaulodon of Godman.) Part of the right 

 branch remains, with a portion of the root of the anterior 

 right molar. 



Two other chins with remains of sockets of anterior molars. 



Left lower maxillary, with the posterior molar, and an empty 

 socket, and part of the chin. 



Right and left lower maxillary bones, forming part of the same 

 jaw. The right is tolerably perfect, and contains the pe- 

 nultimate and posterior molars, with the sockets of one or 

 two others. The left consists only of the posterior half of 

 the jaw, with the posterior molar, which in both is still 

 partly buried in the ascending branch, showing that the in- 

 dividual was not perfectly adult. 



Left lower maxillary bone of large size, with one molar, and 

 an empty socket. 



Left lower maxillary of a young individual, with two molars 

 of six points, and a germ, also of six points, but entirely 

 buried in the bone, which is fractured in such a manner, 

 as to expose the germ. From this piece we learn how 

 many molars with six points, the mastodon possessed. From 

 young jaws formerly discovered, it was already known that 

 there were two of four points ; and the adult and aged spe- 

 cimens make it evident that there was but one of eight or 

 ten points, on each side, above and below. This gives six on 

 each side, or twenty-four in all, as the total number of mo- 

 lars. They were not, however, all in action at the same 

 time. Probably not rtiore than two at once, were in use at 

 any one period of the animal's life, and finally, none but the 

 posterior molar, with four or five pairs of points, and an ir- 

 regular heel remained in the jaw. 



