56 TTNGTTLVTA. 



third right lower true molar. The original, which is 

 figured by Falconer arid Cautley in the ' Fauna Antiqua 

 Sivalensis,' pi. xxxvii. fig. 9, was found on the shore at 

 Sizewell Gap, between Southwold and Easton, Suffolk, 

 and was probably derived from the Red Crag ; it is 

 noticed in the Proc. Geol. Soc. vol. iii. p. 10 (1842). 



(?) Presented by Copt. Alexander, 1842. 



36654. The unworn last two ridges and talon of the third left 



lower true molar ; from the Red Crag. 

 Brown Collection. Presented ly Prof. Sir R. Owen, K.C.B., 1859. 



43188, 45845. Two fragments of early milk-molars ; from the Red 

 Crag. Purchased. 



27851, 28253, 28983, 42729. Four fragments of true molars ; from 



the Red Crag. Purchased. 



The specific reference of the following specimens is provisional. 



40836. Cast of a portion of an upper incisor. The original is from 

 the Norwich Crag, and is figured in Owen's ' British Fossil 

 Mammals and Birds,' p. 291, fig. 101, as a lower incisor 

 of M. angustidens. Presented by C. Falconer, Esq., 1867. 



27852. Tip of an incisor ; from the Red Crag of Sutton, Suffolk. 



Presented ly John Brown, Esq., 1852. 



33192. A proximal phalangeal; from the Red Crag at Easton, 

 Suffolk. Purchased. About 1850. 



Mastodon perimensis, Falconer and Cautley 1 . 

 Syn. Tetrabelodon perimensis, Cope 2 . 



The cheek-teeth of this species are narrow, and contain, a con- 

 siderable amount of cement in their valleys ; their columns, which 

 are arranged somewhat alternately, are tall and comparatively thin 

 antero-posteriorly ; a trefoil is formed on one column of each ridge, 

 and the valleys are almost completely blocked by accessory tubercles. 

 There is a large hind talon to the upper " intermediate " molars, 

 and the third upper true molar is moderately tapering posteriorly, its 



1 Fauna Antiqua Sivalensis, pt. 4, pi. nxi. (1847). 

 * Proc. Amer. Phil. Soc. vol. xxii. p. 5 (1884). 



