10 
PAUNA OP THE INDIAN PLHVIATILE DEPOSITS. 
will be seen not to show the great development of guard wMch is so conspicuous 
in tbe premolars. The guards in both molars is confined to the anterior wall of 
the tooth, and there it occupies a much smaller space, extending less than half the 
length of the wall from the inner anterior angle. Moreover, in molar 1 its position 
is very different, as it lies very high, nearly level indeed with the crown surface of 
the anterior collis, upon which it rather eneroaches and makes a small shelf, harp- 
shaped in plan, instead of a jutting ledge. In molar 2 the guard forms a wide ledge, 
sloping upward from the inner anterior angle nearly to the middle of the anterior ; 
unlike m. 1, however, the guard springs from a point about half way down the side of 
the anterior collis. The anterior collis of the true molars is of much larger propor- 
tions than in the premolars, as compared with the whole size of the teeth, being very 
broad and stout, especially in molar 1, where it forms much more than half of the 
inner side of the tooth. By this increase of size in the anterior collis the anterior 
valley is greatly narrowed, and the pass no longer occupies a median position, and has 
become very narrow and much deeper than in the premolars. The crochet }i%. is very 
large, and all but touches the posterior wall of the anterior collis. The outer wall of 
the anterior valley also forms a projecting fold of enamel {Ji\, fig. 1, Plate I), which 
projects forward and inward. The posterior valley is unfortunately wanting, that 
part of the tooth being broken away, but judging from the fragment of molar 1 of 
the right jaw, which was found loose in the nullah-bed, the posterior valley most likely 
resembled that of premolar 4. This fragment, which is figured in Plate II, fig. 2, 
shows a saddle-like slope descending from the posterior collis /into the posterior valley. 
On the outer wall of the tooth it will be seen that the anterior angle is less promi- 
nent than in premolar 4 ; the hinder part of the outer wall is much broken, but not 
too much to show the peculiar flatness described as characteristic of the premolars. 
The figure of the fragment of molar 1 of the right jaw above referred, was given to 
show the great depth of the anterior valley, which, as before remarked, is one of the 
special characters of the dentition of Deccanensis. 
Molar 2, the largest of all the series, is unfortunately the least perfect, the an- 
terior collis only remaining in tolerable preservation. The general character of this 
tooth can, however, be traced in plan. The form of the guard has been referred to 
already in the description of molar 1. The anterior collis {d) differs less from the ana- 
logous parts in premolar 3 and 4 than does that of molar 1. It is less massive in form, 
and does not encroach so much on the anterior valley. The median collis is, on the 
contrary, actually and proportionately stouter than in molar 1. The pass {p) is a shade 
less narrow, but would appear to have been quite as deep proportionately in the 
unbroken tooth. The two crochets h\ and hi were, judging by the remaining lower 
parts (regarding the tooth as in an inverted position,) much stouter than in molar 1, 
but the angle at which they rise seems to indicate that they projected less into the area 
of the valley. 
The posterior valley is smaller at the same depth than that of premolar 4, and 
forms a long ellipse in plan ; the major axis of the ellipse being nearly parallel to 
