26 
INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
belongs to the right side of the jaw. The transverse valley is fairly open, but is 
blocked for a sliort distance between the two inner columns ; the hindmost of which 
(a) consists of three distinct tubercles : there is a well-marked cingulum surrounding 
the greater j)art of the crown, but this does not extend across tlie inner face of the 
hindmost inner column : a distinct tubercle (c) occurs behind the second outer 
column. Tlie columns are relatively high, and the enamel is comparatively smooth. 
The form of the crown is very close to that of a Euroj)ean specimen of p m. 4 of 
M. angustidens figured by H. von Meyer’ ; both specimens showing the stoppage of 
the cingulum on the hinder inner column, and the detached posterior tubercle (c). 
The variations between the two specimens are, indeed, not greater than those 
between different European specimens of pni. 4 of M. angustidens^ ; and from this 
resemblance, and the circumstance that the enamel is smooth, instead of corrugated, 
the present specimen is provisional!}^ referred to the same species as the molars 
already described, rather than to M. jgandionis^ to which from its larger size it might 
at fii’st sight be referred. As M. falconeri is not known to occur in Dera Bugti, it is 
improbable that the present specimen belongs to that species.® The characters 
distinguishing it from tlie homologous tooth provisionally referred to M. pandionis 
will be noticed under the head of that species : it presents no resemblance to pm. 4 
of the Siwalik tetralophodons.'’ The length of tlie specimen is 1-96; its greatest 
width P5, and the height of the first outer column 1-24 inches: the outline of the 
crown of the corresponding detached tooth figured by H. von Meyer more nearly 
approaches a square. 
Third upper p)remolar . — The small germ of a right third upper premolar 
represented in figs. 4, 4a of pi. V., agrees well in relative size with the last specimen, 
and may, therefore, not imjDrobably be referred to the same species. This reference 
is confirmed by the almost complete similarity of the tooth to European specimens 
of pm. 3 of M. angustidens ^ ; the difference between the Indian tooth and one of the 
European specimens figured by II. von Meyer, being not greater than those between 
the two European specimens figured by the same writer. The Indian and European 
teeth agree precisely in size. 
Last lower premolar. — The difficulty experienced in referring the last upper 
premolars to their respective species is so enhanced in the case of the corresponding 
lower teeth, that it has been found impossible to arrive at any satisfactory conclusion. 
In the first volume of this Avork® two small teeth from Sind were provisionally 
regarded as being the last lower premolars of M. pandionis ; AAdiile a similar tooth, 
said to have been obtained from the Deccan,^ Avas also mentioned ; and the three 
1 Op. cit., pi. III., fig. 12. 
2 Ibid, fig. 1 : for the serial homology of the teeth of that specimen, see vol. L, p. 200. 
3 For the earlier teeth of this species see below". 4 Vide supra, vol. I , pi. XXXVII , fig. 6, and XL. 
5 Von Meyer, op. cit , pi. III., figs. 1, 8, 9, 10. 6 PI. XXXV., fig. 2 ; p. 221. 
7 This tooth is now in the British Museum (No. 40,787): some remarks on its probable place of origin will be made 
under the head of the next species. 
