DESCRIPTION OF PLATES. 53 



sions correspond exactly with those of Lartet's Gers specimen, viz. : 

 Length, 4-5 in. Width in front, 21 in. Width behind, 2-6 in. 



Figs. 10 and 10 a. — Mastodon Andium. l Fragment of tipper true 

 molar. Presented by Lord Shelburne. Shows four ridges and portion 

 of a fifth.— B.M. 



Length, 6" in. Width, 3o in. 



Fig. 11. — M. An dium. Fragment of upper molar, with discs of three 

 ridges much worn. — B.M. 



Length, 5 - 2 in. AVidth, 32 in. 



Figs. 12 and 12 a. — M. Andium. Last upper true molar with four 

 ridges and a complicated heel. — B.M. 



Length, 6-8 in. Width, 3-5 in. 



Figs. 13 and 13 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 "6 in. Breadth, 27 in. Height, 2 - 9 in. Length of 

 second milk molar, 26 in. Width, l - 4 in. Length of third milk molar, 3 - 5 in. 

 Width, 17 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, 7'8 in. 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 (pentdtimate and ante- 

 penultimate) in 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 



1 Memorandum of head of M. Andium between teeth in front, 4'4 in. ; interval 

 in British Museum, not figured. Shows ! between teeth behind, 3'4 in. Length 

 palate with molars. ] f last molar, left side, 875 in. ; width 



Length of the anterior or inter-maxil- '■ in front, 375 in.; width behind, 3-25 in. 

 ration of palate, 15- in. Interval 



