193—16 INDIAN TERTIARY AND POST-TERTIARY VERTEBRATA. 
was associated with the skull described above, but from the similarity in the 
mineralogical characters of the two specimens it is very probable that such was the 
case. Whether this be so or not, the proportionate size of the skull and mandible is 
such that there is little or no doubt that they belong to the same species. 
The mandible shows the whole of the horizontal, and a considerable portion of 
the ascending ramus. It also exhibits a portion of the canine (c), the roots of three 
premolars (pm. 2, 3, 4), the carnassial (m. 1), with the hindmost outer cusp of the 
blade broken off, and the alveolus of m. 2 (imperfectly shown in the figure). The 
specimen presents a strong general resemblance to the mandibles of L. naif, and 
L. vulgaris , but is of somewhat smaller size. It is only necessary to compare it with 
the mandible of the miocene L. lorteti, already referred to, from which it is widely 
distinguished by the much greater length of the carnassial, and by the curved form 
of the inferior border. 
Distribution. — The two specimens above described are the only known remains 
of the species : they were both obtained from the Siwaliks of the neighbourhood of 
the Ganges valley. It would, however, be unsafe to infer that the range of the 
species was limited to that district. 
Species 2. Lutra bathygnathus, n. sp. Nobis. 
History. — In the ninth volume of the 11 Records 5,1 the present writer made 
mention of a fragment of the mandible of an otter obtained by Mr. Theobald in the 
Siwaliks of the Punjab, of larger size than the mandible of Lutra pakeindica, which 
was thought might belong to a distinct species. It is upon this specimen that the 
present species is mainly established. 
Mandible. — In figures 3 and 3a of plate XXVII. the above-mentioned specimen 
is represented ; figure 3 being taken from the inner side, and figure 3a from the 
dental aspect. The specimen is a left ramus of the mandible, showing nearly all of 
the horizontal portion. Posteriorly it shows the carnassial (m. 1), of which the 
hinder cusps of the blade have been broken off : in advance of this is the base of 
the last premolar (pm. 4). Between the latter and the fragment of the canine (c) 
still remaining, there are five dental alveoli, belonging to the first, second, and third 
premolars (pm. 1 : pm. 2 : pm. 3) : the first of these teeth must have been inserted 
by one fang, and each of the others by a pair of fangs. Behind the carnassial the 
alveolus of the second true molar ,is probably concealed by matrix. The form of 
this jaw and its dentition leaves not the slightest doubt that it belongs to a species 
of otter. 
In figure 4 of the same plate there is represented, from the inner , side, another 
fragment of the left ramus of the mandible of an otter, also collected by Mr. 
Theobald in the Siwaliks of the Punjab. This specimen shows the hinder portion 
of the horizontal ramus, and a considerable portion of its inferior border : it also 
1 p. 104.' 
