MOLAE TEETH AND OTHER REMAINS OF MAMMALIA. 
57 
end ; at the posterior end there is a small cingulum occupying the base of the con- 
cavity of the second ridge, and a second smaller prominence below the outer 
extremity of the same ridge. 
Besides its smaller size, the tooth is distinguished from the second molar of 
J). giganteum by the greater concavity of the posterior surface of the second ridge, 
and by the consequently greater prominence of the cingulum ; the tubercle in the 
median valley is also larger ; the anterior cingulum is raised into prominences 
instead of being level ; and the transverse valley is blocked at the outer side instead 
of being quite free. The dimensions of the two teeth are given below : — 
European. 
Indian. 
Antero-posterior diameter ... 
3-90 
2-70 
Transverse diameter of first ridge ... 
3-65 
2-45 
Ditto ditto of second ditto 
3-55 
2-30 
Greatest height of crown 
2-05 
1-50 
The last specimen {fig. 5) is a portion of a first molar of the left ramus of the 
mandible. The specimen is from Sind, and contains the first and second ridges 
only, the third having been broken off ; its position in the series is determined by 
its being three-ridged, and it is seen to belong to the lower jaw by the absence of 
any cingulum at the anterior end. The inner side of the second ridge has the 
enamel worn through at one spot ; the valley between the first and second ridges is 
very shallow, and deepest at its extremities ; the anterior ridge is very short and 
raised into a tubercle at its centre. 
From its small size there can he no doubt but that the tooth belongs to the 
same species as the previous specimens. The dimensions of this specimen are 
given below, viz . : — 
In. 
Length of fragment ... ... ... ... ... 2'05 
Width of first ridge ... ... ... ... ... 1'60 
Ditto of second ditto... ... ... ... ... 2-05 
The width of the base of the crown of the corresponding molar of the Perini 
Island jaw is 2*9 inches, showing that the teeth of that species were very consi- 
derably larger than the present specimens. A last upper molar, a first lower molar, 
and fragments of other molars of a species of Dinotherium are figured by Professor 
H. von Meyer in the German “ Palseontographica” {vol. XV, pi. 3) ; these speci- 
mens were collected by the Messrs. Schlagintweit at Kushalghar ; the teeth corre- 
spond in form with the present specimens, and doubtless belonged to the same 
species ; the last upper molar is, as would be expected, rather larger than the 
penultimate tooth figured here; the lower molar corresponds in size with the 
present specimens ; the cingula in the German specimens are rather more crenu- 
lated than in ours. 
( 75 ) 
