ADDITIONAL SIWALIK PERISSODACTYLA AND PROBOSCIDIA. 23 
is, however, still less favourable for comparison with the present specimens. A 
mnch worn left m, I hgurecl in the first volume (pi. XXXII., fig. 4), as belonging to 
M. falconeri, but which will be shown in the sequel to belong to M. imndionis, differs 
very markedly from the specimens under consideration, with which, from its state of 
wear, it is very favourable for comparison. In the first place, the crown surface is 
much more convex antero-posteriorly ; while the anterior borders of the worn 
dentine surfaces are highly convex, instead of nearly straight : and, in the second 
place, the dentine surfaces of the inner and outer columns coalesce completely in 
the third ridge before they do in the second ; the reverse condition obtaining in the 
present teeth. Again, the dentine surface of the third ridge of M. loandionis^ by the 
absorption of the large double hind talon, becomes much larger than that of either 
of the others. 
In the following table the dimensions of the two specimens under consideration 
are compared with those of . m. 2 of M. falconcri, M. pandionis, and M, angustidenss" 
from Europe : — 
, 
Present specimens. 
M. angustidens. 
M. falconeri. 
M. pandionis. 
, 
A 
f 
Extreme length 
3-63 
3-52 
4-52 
4-65 
5-2 
6-1 
Width at first ridge 
2-2 
2-42 
2'8 
2-9 
3-5 
3-6 
A specimen of m. 2 of M. angustidens from Simorre, figured by MM. Lortet and 
Chantre,^ has almost precisely the same dimensions as the second Biigti specimen. 
Second loiver true molar . — The tooth represented in pi. IV., fig. 7, and in pi. V., 
fig. 3, was obtained from Gandoi. It has been scarcely worn ; and from its 
diminishing rapidly in width towards the anterior extremity must be referred to the 
lower jaw; and belongs to tlie left side. From its general resemblance to the teeth 
already described, it must be referred to the same species ; while from its agreeing 
in size with the upper tooth represented in fig. 2 of the same plate, it must in all 
probability be regarded as the homologous tooth of the lower jaw ; or iW. The 
crown carries three transverse ridges, a small anterior, and a large posterior talon 
[ta ) ; the latter carrying two columns. T]ie median longitudinal fissure is distinct ; 
and tlie transverse valleys are broad ; the first of these having a low, blunt tubercle 
( tu) at its outer extremity ; tlie posterior accessory columns ( a) are larger than the 
anterior [h ) ; and in the first valley the former extends slightly on the inner side of 
the median longitudinal fissure. 
In structure this tooth agrees precisely with IVV of 31. angustidens,^ although it 
is possible that the posterior accessory column may be slightly larger. In the form 
of the hind talon, in which there is a certain amount of variation, it is nearest to a 
specimen figured by Kaup.^ In size it is somewhat smaller than European specimens 
of the corresponding tooth. 
From the corresponding tooth of M. falconerv’ the present specimen is 
1 The specimens figured by Meyer. 2 ‘Arch. Mus. Hist. Nat. Lyon,’ voj. II , pi. XV., fig. 9a. 
3 Meyer, op. cil , pi. IV., fig. 6 : Vacek, op. cit., pi. IV., fig. 2. 4 “ Beitriige,” pt. 3, pi. III. 
5 Supra., vol. I., pi. XXXIII., figs. 1, 4. 
