ELEPHAS PRIMIGENIUS. 225 



described as the " thick-plated " variety of Mammoth's 

 molar; yet, nevertheless, exhibited the characteristic supe- 

 rior breadth, as compared with the Indian Elephant, in a 

 corresponding molar of which species divided into nine 

 plates, the length of the crown was three inches, and its 

 breadth one inch. 



A third upper molar of the Mammoth from the drift at 

 Hinton, Somersetshire, has the crown divided into twelve 

 plates, and measures three inches, four lines in length, and 

 one inch and a half in breadth. This would be precisely 

 the size of the molar tooth of the young Mammoth, figured 

 in Cuvier's ' Ossemens Fossiles,' pi. vi., EUphans, fig. 4, if 

 the figure be, as I suspect, half the size of nature. In a 

 corresponding upper molar of an Indian Elephant of 

 equal breadth, but greater length than the preceding, 

 I found eleven lamellar divisions of the crown ; the more 

 common number is twelve or thirteen.* 



The number of the coronal plates of the fourth grinder 

 in the Indian Elephant is fifteen or sixteen ; the greatest 

 number in the last molar developed, the seventh or eighth 

 in succession, is, according to Mr. Corse, { twenty-two or 

 twenty-three. The number of the coronal plates is subject 

 to greater variation in the Mammoth, and increases in a less 

 regular ratio in each succeeding molar. The fourth molar 

 of the upper jaw, with an antero-posterior extent of from 

 seven to nine inches, varies in the number of its plates from 

 twelve or sixteen. 



The fifth molar, with an antero-posterior diameter of 

 from ten to eleven inches, may have from sixteen to nine- 

 teen plates. 



The largest upper molar of the Mammoth which I 



* This tooth begins to appear above the gum at the end of the second year ; 

 and is shed during the ninth year, 

 t Philos. Trans. 1799, p. 224. 



