282 



PROHOSCIDIA. 



the old Mastodon, the summits of all the mastoid emi- 

 nences having been abraded by mastication ; but they are 

 not so much worn as in a naturally shed tooth. There 

 are eight principal tubercles, with a small anterior basal 

 ridge, and a larger posterior talon. The intermediate 

 connecting eminences in the first and second valleys are 

 worn down to their basal confluence with the larger 

 mastoid tubercles, and thereby occasion a more complete 

 alternate arrangement of these principal divisions of the 

 crown. The wavy fibrous texture of the enamel is re- 

 markably well shown in the fractured surfaces of the very 

 thick layer of that substance which invests the crown. 

 The dentine is reduced to a very brittle friable condition, 

 and the fangs are entirely broken away. 



Two views of a large portion of a corresponding tooth 

 of the Mastodon angustidens are given by Mr. Samuel 

 Woodward in a Paper ' On Remains of Mastodon gigan- 

 teus and Mastodon latidens, found in the Tertiary Beds 

 of Norfolk.'* I have examined the casts of the original 

 specimen figured, which are now in the Geological Society's 

 Museum, and can affirm that this tooth belonged neither 

 to the American nor to the Indian species of Mastodon, 

 cited by Mr. Woodward, but to the Mastodon angustidens. 

 Mr. Layton thus recounts some of the circumstances at- 

 tending the discovery of the molar tooth figured by Mr. 

 Woodward, in a communication printed by Mr. Fair- 

 holme, in his ' Geology of Scripture,' p. 283 : 



" In 1820, an entire skeleton of the great Mastodon 

 was found at Horstead, near Norwich, lying on its side, 

 stretched out between the chalk and the gravel. A grinder 

 was brought to me ; but, so long after it was discovered, that 

 scarcely any other part of the animal could be preserved." 

 * ' London's Magazine of Natural History,' vol. ix. (1836,) p. 131. 



