part 1.] Lydekker: Vertebrata from Tertinries and Secondaries of India. 31 
centre of forehead not in advance of bases of horn-cores ; the latter shorter than in last 
species; occipital crest broad and narrowed, and separated by a considerable interval from 
the intercornual ridge. 
Bubai/us platyceros, n. sp., nobis. 
Frontals nearly flat, rounded superiorly, horn-cores triangular, placed in advance of the 
plane of the occiput, superior border concave, directed upwards and outwards, tapering 
rapidly, widely separated at their bases ; exterior face continuous with the plane of the 
frontals; occipital crest broad and rounded, entirely distinct from the intercornual ridge 
This species is also from the Siwaliks. 
Stegodon ganesa, F. & C. 
A tusk of this species from Biltari in the Nerbudda valley has been for a long period 
in the Indian Museum, though the species has never been described from the Nerbudda 
deposits; it comprehends the greater portion of the middle part, and is from the left side; 
it is characterized by being laterally compressed, and by the extremity curving upwards and 
inwards; in the above points, and in its size, it exactly corresponds with the tusk of Colonel 
Baker’s cranium of S . ganesa. The dimensions are as follows:— 
Length of fragment along concave upper border 
Feet. 
... 6 
luches, 
7 
Length of chord of arc 
... 6 
1 
Vertical diameter near proximal extremity 
... 0 
8-5 
Transverse ditto diito 
... 0 
73 
Vertical diameter at distant extremity 
... 0 
67 
Transverse ditto ditto 
... 0 
47 
The base of the tusk is absent, and must have been of considerably larger diameter 
than our fragment, perhaps as large as that of the tusk of Colonel Baker’s specimen of this 
species, which has a vertical diameter of nearly ten inches. The tusks of S. insignis are 
never more than three or four inches in diameter, while those Elephas namadicus are usually 
of about that size, but are occasionally larger. The largest known cranium of the latter 
species is in the Indian Museum ; it is described by Ur. Falconer in the Catalogue of the 
Asiatic Society’s Collection, p. 235. The largest diameter of the incisive sheath of that 
specimen is 6'6 inches; this being the transverse diameter, the vertical diameter is somewhat 
smaller. The shape of the incisive sheath, as well as its small size, shews that the tusk in 
question could not have belonged to Elephas namadicus, since the above-mentioned ci'auium, 
of the latter species, in the Indian Museum, belonged to an unusually large individual. The 
cranium to which the tusk under discussion belonged must have had an incisive alveolus, 
of which the vertical diameter was at least nine and a half inches. The exact agreement, both 
in form and size, of our specimen with the left tusk of Colonel Baker’s gigantic cranium of 
Stegodon ganesa, now in the British Museum, is of itself amply sufficient to prove that our 
Nerbudda specimen belonged to that species. We have no complete tusks of Elephas 
namadicus in the Indian Museum, but such fragments as we possess indicate that these 
tusks were nearly straight and cylindrical, and therefore quite unlike the present specimen. 
The large size of our specimen sufficiently distinguishes it from Stegodon insignis. 
The range in time of Stegodon ganesa must now be made equivalent to that of the 
allied Stegodon insignis, which lived down to the Nerbudda period, and must have been 
a contemporary of the early human inhabitants of India. 
Sivalhippus Theobaldi, n. gen., nobis. 
This genus is formed upon the evidence of a portion of the left maxilla with teeth of 
an aberrant horse lately sent down by Mr. Theobald from the Siwaliks of Keypar in the 
