SIWALIK AND NAEBADA PEOBOSCIDIA. 
83-264 
Third upper milk-molar . — I have no complete specimen of the third upper 
milk-molar, though an incomplete specimen of this tooth will be noticed when I 
come to the first upper true molar. 
Third loioer milk-molar. — Two much- worn and somewhat mutilated specimens 
of the third lower milk-molar of Stegodon bomhifrons are figured in the “ Eauna 
Antiqua Sivalensis” (Plate XXIX A, fig. 1, Plate XXIXB, fig. 5). The first of 
these teeth carries six ridges and a talon, and has a length of 4 inches, and a width 
of 2 inches. The second carries five ridges, and fore-and-aft talons, and has a 
length of 3'6 inches and a width at the widest point of 1’8 inches. No description 
of these teeth has ever appeared. 
In fig. 3 of Plate XLV of this memoir I have had drawn a perfect specimen 
of a tooth which certainly appears to he the third lower milk-molar of the right side 
of Stegodon bomhifrons. This tooth is now in the Indian Museum, and was obtained 
by exchange with the Dahore Museum. It was found in the Siwahks of the 
Punjab. The crown carries five transverse ridges, and two small talons, the most 
anterior one being somewhat broken. The first three ridges are worn, but the two 
last are still untouched by attrition. 
The penultimate ridge carries about nine cusps. The ridges are very low and 
blunt, and there is but a small quantity of cement in the valleys. The dimensions 
of the specimen are as follows : — 
Length 4i‘l 
Width of first ridge 17 
Ditto of penultimate ridge 2‘2 
Height of ditto ditto I'l 
Antero-posterior diameter of base of penultimate ridge .075 
Interval between sumnodts of penultimate and ante-penultimate ridges 075 
The unworn ridges are lowest at their centres ; the two first ridges have a 
slight obliquity in the plane of wear, which slopes from the inner to the outer side : 
in the third ridge, which is less worn, and in the two unworn ridges, the centre 
of each ridge is the lowest point, showing that the tooth cannot belong to 
S. cliftii. In its blunt ridges, low ridge-formula, and small quantity of cement, 
the tooth presents all the characters of the molars of Stegodon bomhifrons. It will 
be seen below that the corresponding tooth of Stegodon insignis carries a larger 
number of ridges, which are also thinner and taller. The corresponding tooth of 
S. cliftii is unknown, but its ridges would probably be considerably higher on the 
inner than on the outer side, and the whole tooth would also be wider than the 
specimen under consideration. The figured tooth seems to agree very closely with 
the five-ridged tooth figured by Palconer, but is of slightly larger size, and the 
hind-talon relatively rather smaller. 
It seems that the third lower milk-molar of Stegodon bomhifrons may have 
either five or six ridges, and it is therefore inferred that the corresponding upper 
tooth, when discovered, will present either one or both of these numbers. 
