MOLAE TEETH AND OTHER REMAINS OE MAMMALIA. 
27 
mammals (Rec. Geol. Surv. Ind., Vol. IX), the Deccan fossil species showed affinites 
to older forms, especially in the presence of its large cingulum; the present 
specimen shows another link in the chain which relates it to the extinct Rhinoce- 
rotes and Acerotheria of the European Miocene beds. 
The specimen drawn in plate 5, figure 4, is a portion of the right maxilla of a 
species of Rhinoceros^ containing two teeth, from Burma, in the Indian Museum. 
At the distal extremity of the bone (not shown in the figure), there is the alveolus 
of a third tooth, containing portions of the “ fangs.” This tooth will probably be the 
second premolar, as the first usually falls out at an early period ; consequently the 
two teeth drawn will be respectively the third and fourth of the premolar series. 
At the proximal extremity of the bone {also omitted in the figure) are the imbedded 
fangs of a fourth much larger tooth, which, if this view be correct, wUl be the first 
of the true molar series : these teeth are referred to by Mr. Eoote in the first part 
of this volume (p. 16). 
The penultimate premolar {on the right side of the figure) is complete and 
uninjured ; a portion of the enamel of the anterior collis of the ultimate premolar 
has been broken away, and a caste of the dentine only remains. 
Taking first the penultimate premolar, we find the external surface or dorsum 
of the tooth divided into two equal portions by a prominent vertical costa ; the 
antero- external angle {the right upper angle of the figure) is wedge-shaped and 
slightly produced ; the anterior side is angulated in the middle, and set obliquely 
to the outer side. The anterior and median colies are of nearly equal diameter ; 
the latter gives off a sharp wedge-shaped crochet, small and simple; it projects 
about half-way across the median valley. A large combing-plate is given off from 
the outer wall of the valley ; this plate is thicker at its free extremity than at its 
origin : the free extremity is separated by a small interval from the crochet ; the 
worn-crown would present three fossettes. The pass leading into the median valley 
is very low, nearly at the base of the crown ; it is of considerable length, running 
as a level line between the contiguous bases of the colles for a distance of rather 
more than a quarter of an inch, at which point there is a sudden descent into the 
expanded valley : there is no tubercle at the entrance of the valley. 
The cingulum occupies almost the whole of the anterior side of the tooth, and 
forms a distinct ledge ; there is no cingulum on the inner side ; the anterior valley 
is scarcely distinguishable. The posterior collis {on the extreme left of the figure) 
is small, though distinct, separated by a channel from the median collis ; the 
posterior valley is large and nearly circular with a sharp narrow pass. The measure- 
ments are as follows 
In. 
External side 
1-4 
Internal side 
0-9 
Anterior side 
1’2 
Posterior side 
1-1 
( 45 , 
