265—84 
SIWALIK AND NAEBADA PBOBOSCIDIA. 
First upper true molar. — There is no specimen of the first upper true molar of 
Stegodon bombifrons figured in the “ Fauna Anti qua Sivalensis,” neither do any of 
the crania of that species in the Indian Museum contain this tooth. 
The six-ridged tooth represented in fig. 1 of Plate XLVI of this memoir, is I 
think, in all probability, from its low ridge-formula, the first upper true molar of 
Stegodon bombifrons ; the tooth certainly does not belong to S. cliftii, and I cannot 
find any instance of the corresponding tooth of S. insignis carrying less than seven 
ridges ; moreover, the ridges are rather lower in the figm’ed specimen than in the 
corresponding tooth of S. insignis. 
The figured tooth is the specimen referred by me to Stegodon sinensis 
in the “ K-ecords.”^ This determination was made from the curvature of the 
ridges, before I found that this was a valueless character, and before I had ob- 
tained the cast of the tooth on which the Chinese species was founded by Professor 
Owen. 
The figured tooth was obtained by Mr. Theobald in the Kangra district, and is 
implanted in a fragment of the left maxilla, which also contains the much-worn last 
milk-molar. The crown of the tooth carries six complete ridges, and a large anterior 
talon. The first four ridges are worn, while the two last are still intact. The 
penultimate ridge carries twelve or thirteen tubercles, and, like the other ridges, has 
its highest point in the centre. The first three ridges are nearly straight ; but the 
three last are much curved. One of the tubercles of the last ridge is placed con- 
siderably in advance of the others. There is a slight trace of a median division in 
the first two ridges. The length of this tooth is 5 ’9 inches, its greatest width 3 
inches, and the height of the penultimate ridge 1‘6 inches. 
The height of the ridges in this tooth is slightly less than is generally the case 
with those of the corresponding tooth of Stegodon insignis, though the ridges in 
some specimens of the latter are hot higher than in the present specimen. It is 
therefore only from the low ridge-formula that I consider it probable that this tooth 
belongs to S. bombifrons, in which we know that the last molar has a lower formula 
than in S. insignis. Another very similar tooth in the Indian Museum, which I 
also refer to S. bombifrons, has six ridges, but no trace of a hind-talon. Prom 
the convexity of the ridges the figured tooth cannot belong to S. cliftii, of which 
the first true molar has been already described. 
The last milk-molar in the same jaw is worn away to such an extent that only 
the two last ridges are differentiated from the common surface of dentine to which 
the others have been reduced. Still, however, from the shape of the crown of this 
tooth, I am nearly certain that it could not have carried more than either five or six 
ridges, in which case the jaw may pretty safely be referred to the present species, 
as the last milk-molar of S. insignis never has less than seven ridges. 
I have figured this tooth chiefly to show that a great degree of curvature may 
occur in the ridges of species of Stegodons, which are usually quite straight. In the 
Kec. Geol. Sui v. India, Vol. XI, p. 73. 
