MOLAE TEETH AND OTHER REMAINS OE MAMMALIA. 
49 
great height of the crown, and by the peculiar arrangement of the flutings on the 
inner surface {jig. 4), as well as by the great size of the accessory column. 
Both of the central enamel folds of the crown have become completely insula- 
ted by wear ; the inner border of the crown surface {tipper border of jig. 6) forms 
a continuous wavy line ; the median summits of the inner surfaces of the barrels 
form the most prominent points on the inner border of the crown surface. The 
accessory column extends two-thirds up the crown, and is of large relative size, and 
placed somewhat internally to the mouth of the median valley. 
On the external surfaces the enamel is slightly rugose : on the internal surface 
the enamel is generally smooth, marked here and there by dots and pits. The 
length of the specimen is I'l inches, and the width 0’8 inch ; the height of the 
crown being 1*2 inches. 
Ceuvus triplidens, nov. sp. nobis. Plate 8, figs. 1, 2, 5. 
This species from the Siwaliks is named from the unusually large size of the 
accessory column of the upper molars. The specimens figured consist of the 
second and third molars of the right maxilla ; the first of these is slightly worn, 
while the second is merely a germ, as yet untouched by wear. 
The teeth are noticeable for the great elevation of the crown, which is con- 
siderably higher than in most living species of Deer ; the base of each tooth has 
its antero-posterior diameter rather longer than the transverse. The inner surfaces 
of the barrels are broad and rounded, sloping slightly from the inner to the outer 
side ; a vertical groove runs down the inner half of the posterior side of the hind 
barrel. Between the barrels there is a tall and large accessory column extending 
two-thirds up the crown ; the accessory column presents a triangular cross-section, 
and has a deep vertical groove on its anterior face ; the innermost edge of this 
column projects on the inner side of the tooth in advance of either of the barrels. 
On the anterior surface of the tooth there is a very small rndiment of a cingulum 
{not seen in figure) ; these two last characters are constant in all our specimens. 
The central enamel-folds on the crown-surface are narrow and shallow, and 
would become completely insulated at an early period of wear. The innermost 
dentine surfaces are unsymmetrical and elongated. The outer segments of the 
barrels are set slightly oblic[uely to the antero-posterior axis of the tooth, their 
anterior costse forming the most prominent points on the outer border of the 
crown. 
On the external surface {jig. 2) the hinder barrel is divided into three very 
prominent Costse ; the median costa is by far the larger of the three, and becomes 
confluent at its base with the other two ; as it descends from the neck of the tooth, 
it rapidly diminishes in width and bends slightly forwards : deep grooves divide 
the costse. The external lobe of each barrel becomes narrower as it ascends from 
the summit of the crown to the neck. The posterior barrel shows only two costae 
( 67 ) 
