DESCRIPTION OF PLATES. 43 
remains. ‘The six posterior ridges have their fang elements confluent 
into a continuous plate or shell, thus maintaining the elephantine 
affinity indicated by the crown characters. The crown is very flat; 
the points are large and few in number, and there is no very distinct 
mesial dividing line, but little cement. This magnificent specimen was 
brought from Burmah by Col. Burney, and presented by him to the 
British Museum. 
Length, 12°7 in. Width at middle, 4°5 in. 
Figs. 6 and 6 a.—Mastodon latidens ' (Clift). Fragment of lower 
jaw, left side, with last or third true molar. This is one of the most 
enormous Specimens ever seen, the greatest girth over the molar being 
no less than 27°5 inches. There is one mental foramen; no appear- 
ance of tusk. The molar has five ridges and a double heel; the points 
are very large, and the discs of wear very broad; the mesial line of 
division is distinct; there is no cement. ‘The plane of wear in front 
shelves from the inside out. There is a very similar specimen in the 
Museum of the Asiatic Society of Bengal. 
Extreme length of fragment, 16:2 in. Height of jaw at anterior end of 
alveolus, 10°2 in. Greatest thickness, 6°8 in. Length of molar, 11°3 in. Greatest 
width, 4°5 in. 
PuaTE XXXI. 
Figs. 1 and 1 a.— Mastodon latidens. Upper milk molar.—B.M. 
Length, 2°7 in. Width, 2°4 in. 
Figs. 2 and 2 a.—WM. latidens. Upper milk molar (third ?).—Castin B.M. 
Length, 3°8 in. Width, 2°6 in. 
Figs. 5 and 3 a.—WM. latidens. Fragment of upper jaw, right side, 
with two molars (third milk and first true ?).—B.M. 
Length of posterior molar, 5°6 in. Width, 2°9in. Length of anterior molar, 
3°7 in. Width, 2°6 in. 
Figs. 4 and 4 a.—WM. latidens. Portion of palate, with two upper 
molars left side.—B.M. 
Length of anterior tooth, 3-9 in. Width, 2°8 in. Length of posterior tooth, 
4-2 in. Width, 3:4 in. 
Figs. 5 and 5 a.—WM. latidens. Fragment of upper molar.—Cast in 
B.M. 
Length of fragment, 3:4 in. Width, 4:2 in. 
Figs. 6 and 6 a.—M. latidens. Upper true molar, very perfect.—B.M. 
Length, 8:5 in. Width, 4°5 in. 
Figs. 7 and 7 a.—WM. latidens. Fragment of lower molar with fang. 
—B.M. 
Length, 5°in. Width, 3-3 in. Length of crown fang, 5:3 in. 
Figs. 8 and 8 a— MW. latidens. Lower molar well worn.—B.M. 
Length, 6:4 in. Width, 3°3 in. Height of crown fang, 6:4 in. 
Mastodon latidens, like the M. longirostris of Eppelsheim, presents a 
Dinotherian type, in so far as the crowns of the molar teeth are con- 
cerned; and in this respect it contrasts with MW. S’valensis and M. 
Arvernensis, in which the molars have a hippopotamoid type. In MW. 
latidens the crown is broad, the mammille are thicker in proportion 
1 See note 1, page 41. 
