100 MASTODON AND ELEPHANT. 



TEETH. 



There are, in the jaws of this Mastodon, two teeth on each side of 

 each jaw, making the whole number present to be eight. The anterior 

 of these is the third six-pointed tooth, the fifth in the whole series, or the 

 penultimate molar. The posterior tooth on each side is the five-ridged, 

 ten-pointed, or ultimate molar. They correspond in number, form, and 

 size with those in the large skeleton, with the following exceptions: The 

 last molars are not so fully developed ; the fifth transverse ridge is, however, 

 larger; and the transverse furrow, between the fourth and fifth, is deeper. 

 The anterior or penultimate molar is less used than in the large skeleton ; 

 the points being, in a great measure, preserved. 



MASTODON. ELEPHANT. 

 Inches. Inches. 



The anterior tooth measures 4£ ant. post, by 2f 1\ by 3 



The posterior tooth measures 6| ant. post, by 3£ 



From the alveolus of the tusk to the anterior surface of the front tooth is . 1\ . . 

 From the posterior edge of the last molar to the termination of the bony 



palate posteriorly 2 . . 



Dental length 11| . . 4i 



Dental width 3 . . 5 



LOWER JAW. 



This is about half the width of that in the large skeleton, but much 

 broader than that in the Elephant, which terminates anteriorly in a long, 

 pyramidal, smooth process, ending in-' a point. The rough extremity in 

 the Cambridge Mastodon exhibits no appearance of an excavation for a 

 mandibular tusk, in which it greatly differs from this part in the large 

 skeleton. 



The mandibular extremity is rough as if broken, and measures . . . 2J . . 10 



Length of the horizontal branch 26 . . 16 



