MOERITHERIUM. 



15 



by a formula, thus: I. |, C. \, Pm. *-, M| = }*, the letters 

 denoting the kind of teeth, the upper numbers the number 

 of each kind on one side in the upper jaw, the lower 

 numbers those in the lower jaw, so that in the example above 

 given there would be eleven teeth on each side in both the 

 upper and lower jaws, or forty-four in all. As has already been 

 mentioned, a greater or less number of these teeth may be 

 wanting in different animals and the formula will differ 

 accordingly : thus in man it is I. %, C. ^ Pm. ^ M. 5 = - 8 or 

 thirty-two in all. In the cat it is I. , C. J, Pm. |, M. f = f- 

 or thirty in all. 



With these preliminary remarks we may proceed to describe 



Fig. 7. 



Upper and lower teeth of Moeritherium. 



A. Upper teeth. B. Premaxilla, large tusk-like second incisor. C. Man- 

 dible from outer side. c. } socket of canine ; i. 1-3, incisors ; m. 1-3, 

 molars ; pm. 2-4, premolars. nat. size. 



the teeth of Moeritherium (figs. 5 & 7). In this animal the 

 dental formula is I.-, C. -J, Pm. |, M. | = or thirty-six in all. 



