235—64 
SIWALIK AND NAUBADA PEOBOSCIDIA. 
with a large hind-talon, others five ridges, and others again five ridges and a large 
hind-talon, so that these teeth present modifications, in this respect very similar 
to those which we have found to prevail in the corresponding upper teeth. The 
length of a tetralophodont second lower true molar in the Indian Museum is 
6’ 8 inches, and its width 3’ 6 inches. 
Third upper true molar. — The large tooth represented in Plate XXXIX is 
a specimen of the last upper molar of the right side of M. latidens, collected 
by Mr. A. B. Wynne near the village of Lehri, in the Punjab. This speci- 
men is implanted in a fragment of the maxilla, which also contains the two 
last ridges of the preceding or penultimate tooth. The figured tooth is entirely 
unworn, and was still covered by the gum at the death of the animal. The crown 
carries six transverse ridges, the hindmost of which is considerably smaller than 
the others, and probably represents an ultra- developed talon, as we saw to be the 
case in the penultimate molar represented in fig. 1 of Plate XXXVIII. The 
tooth consequently belongs to a “ pentalophodont” type of dentition. The ridges 
are low and simple, and with the exception of the first, are slightly convex an- 
teriorly, and as concave posteriorly. Each ridge is divided by a longitudinal cleft 
placed somewhat externally to the mesial antero-posterior axis of the tooth. 
The internal moiety of each ridge, with the exception of the second and sixth, 
bears three mammillEe or cusps, while the external moiety bears only two on each 
ridge. The valleys are quite simple and uninterrupted. In this tooth, as also in 
all the previously described specimens, there is no trace of cement. The length of 
the specimen is 8’6 inches, and its greatest width 4-2 inches. The last upper molar 
of this species represented in fig. 6 of Plate XXXI of the “ Eauna Antiqua 
Sivalensis” has the normal five ridges of the tetralophodont type, and there is a 
similar specimen in the Indian Museum. This tooth may, therefore, be either 
penta or hexalophodont. 
Third lower true molar. — I have not yet seen any complete specimen of the 
third lower true molar of this species. An imperfect specimen, in the collection of 
the Indian Museum, from the Punjab, has four ridges remaining, the first of which 
has a width of 4T inches. 
Tremolars. — In figs. 6, and 7 of Plate XXXVII are represented two small 
teeth which are probably both premolars, and one of which (fig. 6) certainly belongs 
to M. latidens. I cannot be sure whether the other specimen is rightly referred to 
the present species, and I may add that it is often a matter of extreme difficulty 
to refer these small isolated teeth to their respective species and serial position, 
when we have a large number of species to deal with. 
Last upper premolar . — With regard to the tooth represented in fig. 6, no 
difficulty presents itself, since this tooth is a germ which was embedded in the 
bone above the base of the last left upper milk-molar represented in fig. 8 of 
the same plate, and which must consequently be the last upper premolar of the 
same side. The crown of this germ has its angles rounded off, and carries two 
