MASTODON ANGUSTIDENS. 279 



been abraded by mastication, but more gradually than 

 those of the Peruvian Mastodon's molar figured by Cuvier. 

 The fangs and a portion of the anterior part of the crown 

 have been broken away in the specimen. 



In Mr. Smith's figure, the mirror has not been used 

 by the engraver, and it consequently, like the woodcut 

 fig. 97, represents the molar as having belonged to the 

 left side of the jaw, but the specimen is from the right 

 side. 



A fine example of the last molar tooth of the left side 

 of the upper jaw, obtained by Captain Alexander from 

 the sea-shore at Sizewell Gap, Suffolk, so closely corre- 

 sponds in size and configuration with the molar in fig. 97, 

 that, but for the greater extent of abrasion, it might pass 

 for the opposite grinder of the same individual Mastodon. 

 A cast of this tooth was presented by Captain Alexander 

 to the Geological Society of London, and the following 

 notice of it is recorded in the third volume of the ' Pro- 

 ceedings 1 of the Society : 



" The larger cast was taken from a Mastodon's tooth, 

 found on the shore at Sizewell Gap, about seven miles 

 from Southwold. When the original came into Captain 

 Alexander's possession, crag adhered to it in considerable 

 quantity, and he has no doubt that it had been washed 

 from Easton, about a mile and a half north of Southwold. 

 The weight of the tooth is two pounds, five ounces and 

 a half; its length is about six inches, and its breadth three 

 inches and a half ; and, although it had been washed eight 

 miles, only three of the crowns had been injured." 



From an inspection of the cast, it appears that the 

 first and fifth pairs of tubercles, and the posterior tuber- 

 culate talon, have suffered fracture. The effects of abrasion 

 from the acts of mastication have extended to the fourth 



