SIWALIK AND NARBADA PROBOSCIDIA. 
43—224 
pJiodon, being either the second milk-molar or the last premolar. The tooth belongs 
to the left ramus of the mandible, as is shown l)y the inner extremity of each of 
the two transverse ridges (top border of figure) being considerably higher than the 
outer ; the first ridge is slightly smaller than the second, and there are small fore- 
and-aft-talons. The plane of detrition of the first ridge is directed obliquely back- 
wards, and that of the second ridge obhquely forwards ; each ridge is mesially 
bisected by a distinct antero-posterior cleft into an outer and an inner column. 
The length of this tooth is 1’6 inches and its greatest width I'l inches. 
With regard to the position of the tooth and the species to which it belongs, I 
have but little doubt that the specimen belongs to a TrilopJwclon of the two 
Indian Trilopliodons, the second lower milk-molar of M. falconeri is known, and 
it is probable that there were no premolars developed in that species ; there only 
remains, therefore, 31, pcmdionis. 
Of two specimens of the lower young dentition of M. angustidens in the 
Indian Museum, the one shows the last milk-molar, with the last premolar in 
alveolo below it, and the other the second and third milk-molars. In both these 
specimens the last milk-molar has a length of about 2^ inches ; the second milk- 
molar is 1’3 inches in length and the last premolar 1‘8 inches. It is, therefore, 
apparent that in jaws having the last milk-molar of the same size, the last premolar 
is larger than the second milk-molar. On these grounds I have provisionally 
classed the tooth represented in figure 2 of plate XXXV (closely resembling the 
last lower premolar of M. angustidens) as the last lower premolar of 3£. pandio- 
nis, and the smaller tooth represented in figure 3 of plate XXXVII (closely 
resembling the second lower milk-molar of 31. angustidens) as the second lower 
milk-molar of 31. pandionis} 
The tooth classed as the second lower milk-molar of 31. pandionis is small as 
compared with the second upper milk-molar of the same species figured in this 
memoir (PL XXXV, fig. 3). Palconer’s specimen of the latter tooth referred to 
above, however, is smaller and agrees well in this respect with the lower tooth. 
The difference in size of the last lower premolars, shows the variations in size which 
the teeth of this species may undergo. 
General characters. — Having now described such of the remains of 31. pan- 
dionis accessible to me, as are of the most importance in illustrating its dentition 
and osteology, I proceed to summarize the general and distinctive characters of the 
species, as far as they are at present known. We are unfortunately totally unac- 
quainted with the cranium, and nothing, therefore, can be said regarding this 
important part of the skeleton. The mandible is charaeterized by its compressed 
rami, and by being produced into an enormous symphysial rostrum, which in some 
individuals was tuskless, and in others (unless the symphysis figured in Plate 
XXXVI, fig. 2, belongs to a new species) carried large and much curved incisors. 
1 The specimen figured in figure 6 of plate V of the above-quoted memoir of Meyer as the second milk -molar of 
Jlf. angustidens is a three-ridged tooth, and would therefore seem to he the third milk-molar. 
