43 
PART 1.] Li/ikMer: Further Notices of Slwalik Mammalia. 
Dera Grhazi Khan, and which seems undoubtedly to belong to the same species. 
The specimen consists of the last ridge of a third upper molar of the left side, 
but very little worn. Its dimensions are given below, together with those of the 
second upper molar of D. poitapotamiee, described at page 65 of the second fasciculus 
of the tenth series of the “ Palseontologia Indica,” and also with those of the 
same tooth of B. giganteum 
T), indicum. 
X>. giganteum. 
D. pentapotamia. 
Width of last ridge ... ... 
... 3-7 
3-4 
23 
Thickness of base of ridge 
1-8 
16 
IT 
The new tooth differs from the figured specimen of D. pentapotamice in 
having no ledge on the hinder side of the last ridge, and in the ridge itself being 
somewhat less curved ; it agrees with the other teeth of B. intUcum in having 
very thick enamel, and being slightly larger than the corresponding tooth of 
D. giganteum ; there is a tubercle on the inner side of the transverse valley. 
New species of Dinotheeicm. 
In addition to Dinotherium indicum and B. pentapotamim, we have now evi¬ 
dence of a third species of Indian species of the genus. The specimen from 
which this evidence is derived consists of a portion of the lower jaw, containing the 
two last molars, collected by Mr. Fedden in Sind. The jaw and teeth are much 
smaller than those of B. pentapotaynice; the characteristic point of the jaw is, 
however, its cylindrical form, in which respect it differs from all other species of 
the genus. 
Genes MASTODON. 
Of the genus Mastodon, Mr. Theobald’s last collection contains a great 
number of specimens of the jaws and teeth, some of which are of great interest, 
and add considerably to our knowledge of these animals. A few of the most 
interesting specimens are noticed here cursorily, as it will be a long time before 
I shall be able to describe them in detail. 
Mastodon pandionis, Falc. 
The first specimen in this collection which calls for especial notice is a portion 
of the mandible of a Mastodon, which cannot be referred to any of the previously 
known Siwalik species. The specimen comprises a portion of the horizontal 
ramus with two molars, and the symjjhysis of the mandible; the intermediate 
portion of the specimen was also discovered, but unfortunately cinimbled to dust 
during its transit down country. The most noticeable portion of this jaw is the 
symphysis, of which the part now remaining has a length of 22 inches; this part 
is laterally compressed, and on its upper surface is excavated by a large groove 
upwards of 5 inches in depth at its proximal extremity. 
The one complete tooth in this jaw candes four transverse ridges and a hind 
talon; its length is 8"5, and its width 3'7 inches ; this tooth is the last true molar, 
and the jaw therefore belongs to a Trilophodoyi. The crown of the penultimate 
