284 PROBOSCIDIA. 



How far the testimony of the workmen may be relied 

 upon as indicative of arrested decomposition and change 

 to adipocere of the soft parts of an entire Mastodon, may 

 be questioned ; but the tooth is, without doubt, such as 

 Mr. Layton has described, showing eight alternating un- 

 worn mastoid eminences ; but belonging, not to the Masto- 

 don giganteus, as might be inferred from the term Great 

 Mastodon, but to the Mastodon angustidens. 



F . 1QO The molar tooth, the grinding sur- 



face of which is represented at fig. 

 100, is the fourth in the order of 

 size, and the third in the order of 

 position, counting backwards in the 



upper jaw, before any of the teeth 



Fourth upper Molar, Masto- , -, ^ .. , , j , ., 



... , . are shed ; and it belonged to the 



don angustidens, luuvio- 



marine Crag, Norwich, left side of the mouth. This beau- 



J nat. size. ^.p u j S p ec j men a l so f orms p ar t of the 



collection of Mr. Fitch, and was obtained by that zealous 

 collector of the organic fossils of Norfolk from a crag-pit 

 at Postwick, in the vicinity of Norwich : it was imbedded 

 in the fluvio-marine crag, with the characteristic shells 

 of that formation, immediately above the chalk. 



This tooth corresponds with the larger molar in the 

 portion of the upper jaw of the Mastodon angustidens, 

 from the tertiary deposits at Dax, figured by Cuvier in 

 his ' Divers Mastodontes,' pi. iii., fig. 2 ; and with the 

 largest molar in a similar portion of the upper jaw of 

 the same species of Mastodon from Eppelsheim, figured 

 by Dr. Kaup in tab. xvi., figs. 1 and 1 a of his work 

 on the Mammalian Fossils of that locality. In Dr. Kaup's 

 figure, the tooth in question is associated with the first 

 and second molars of the Mastodon angustidens, which are 

 much worn, and are true deciduous teeth, the only ones, 



