DESCRIPTION OF PLATES. 53 
sions correspond exactly with those of Lartet’s Gers specimen, viz. : 
Length, 45 in. Width in front, 2-1in. Width behind, 2°6 in. 
Figs. 10 and 10 a.—Mastodon Andium. 1 Fragment of upper true 
molar. Presented by Lord Shelburne. Shows four ridges and portion 
of a fifth.— B.M. 
Length, 6: in. Width, 3-5 in. 
Fig. 11.—M. Andium. Fragment of upper molar, with discs of three 
ridges much worn.—B.M. 
Length, 5°2in. Width, 3-2 in. 
Figs. 12 and 12 a.—M. Andium. Last upper true molar with four. 
ridges and a complicated heel—B.M. 
Length, 6°8in. Width, 3°65 in. 
Figs. 13 and 138 a.—M. Andium. Fragment of left lower jaw, with 
second and third milk molars in situ. The specimen is broken at the 
symphysis and coronoid process. From the relative size of the jaw and 
the development of the teeth, the animal corresponded to a sucking 
Indian elephant of about two years of age. The second milk grinder 
is fully protruded, but had barely come into use, the two front ridges 
being but slightly abraded. The third is in the state of an intact germ, 
and although fully formed, it had not penetrated the gum when the 
animal died. These teeth are both three-ridged, with a subordinate 
crest in front, and a small bi-tubercular talon behind. They are exactly 
alike in form, narrow in front, but broader backwards. The ridges, as 
in M. angustidens, consist of two pairs of principal points, which 
instead of being nearly simple, as in the latter species, are subdivided 
into a vast number of superficial warty tubercles, which jut into the 
valleys, forming a bridge or connection between the contiguous ridges, 
and interrupting the transverse continuity of the valleys. In this 
respect they more resemble the young teeth of M. longirostris. Specimen 
from Buenos Ayres in B.M. 
Length of fragment of jaw, 7°6in. Breadth, 2°7in. Height, 2°9in. Leneth of 
second milk molar, 26in. Width, 1-4in. Length of third milk molar, 3:5 in. 
Width, 1°7 in. 
Figs. 14 and 14 a.—Mastodon Andium. Fragment of lower jaw 
with last true molar, exhibiting four ridges and a complicated heel. 
The three anterior ridges are touched by wear. 
Length of tooth, 7°8in, Width, 3-2 in. 
Figs. 15 and 15 a.—M. Andium. Greater portion of lower jaw, left 
side, with the first and second true molars (penultimate and ante- 
penultimate) zm situ, showing also the empty alveolus of the last true 
grinder and of the third milk tooth. The ternary number holds in 
the ridges, there being three collines in each tooth, with an aggregate 
nest of tubercles in the intervals. There are no remains of cement. 
The anterior tooth is somewhat worn, the discs taking the form of a 
quadrifoil. This specimen is from Chili, and was presented to the 
Museum at Canterbury by General Miller; there is a cast of it in the 
in British Museum, not figured. Shows | between teeth behind, 3-4in. Length 
palate with molars. | of last molar, left side, 8°75in.; width 
Length of the anterior or inter-maxil- | in front, 3:75 in.; width behind, 3:26 in, 
lary portion of palate, 15-in, Interval | 
' Memorandum of head of M. Andium | between teeth in front, 4°4in.; interval 
| 
