SIWALIK AND NARBADA CARNIVORA. 
167—344 
ment of the occipital crest. The mastoid process is, moreover, antero-posteriorly 
compressed in the larger, and subcylindrical in the smaller skull. These differences, 
coupled with the much larger size of the present specimen, leave little doubt as to 
the specific distinctness of the two crania ; and since the present specimen agrees 
well in proportionate size with the mandible of M. palceindicus its reference to that 
species by Mr. Bose may be accepted. 
Second specimen. — In figure 2 of plate N. of the u F.A.S.” there is represented 
the greater portion of another Siwalik skull in the British Museum (No. 39,729) ; 
also referred by Mr. Bose to the present species. The specimen is greatly mutilated 
and crushed, and lacks the teeth and jaws. From its high occipital crest, and from 
the position of the condyles being considerably above the level of the auditory 
meatus, it is pretty certain that the generic reference is correct, while there is a 
strong probability that the specific one is likewise so. There is apparently some 
difference in the form of the post-orbital process of the frontal of this and the 
preceding specimen ; but it is quite possible that this may be due to crush, Or to 
differences in age and sex. The present specimen is so damaged that it adds little 
or nothing to the knowledge of the species. 1 
Comparisons. — Compared with European and American species the cranium of 
M. palceindicus differs from that of M. meg anther eon , and probably, therefore, from 
that of M. cultriclens , by the downward prolongation of the mastoid process of the 
periotic and of the zygomatic process of the squamosal ; and thereby agrees with 
the crania of the American M. neogeeus, M. necator, and M. fatalis. In the form of 
the occipital region the present skull comes nearer to M. neogeeus than to M. necator ; 
the occipital crest of the latter not being raised above the general level of the skull, 
and the mastoid process running very obliquely, and forming a continuation of the 
lateral border of the occiput. In M. neogeeus the occipital crest is more produced, 
although not to such an extent as in the present species : the supra-occipital, in place 
of having the shape of an inverted V, being more like an inverted U. A considerable 
difference may also be observed in the form of the arch covering the auditory 
meatus. The extreme production of the supra-occipital in the present species 
probably indicates that the canines were at least as large as in M. neogeeus ; — an 
inference confirmed by the characters of the mandible. Comparisons are not possible 
between the present skull and M. fatalis and M. gracilis. 
Upper incisor. — In plate XLIII., fig. 9, there is represented a third left upper incisor 
of a Machceroclus, obtained by Mr. Theobald from the Siwaliks of Asnot, Punjab. The 
specimen is represented from the inner aspect, and shows the serrated posterior cutting 
edge ; from which the genus is determined. The anterior cutting edge has been entirely 
worn away ; its place being occupied by a large facette (a) formed by the attrition 
of i. 3 : the opposite surface presents a similar facette formed by the attrition of the 
lower canine. The form and position of these two facettes determines the tooth to 
l Mr. Bose draws some conclusions from this specimen as to the relative length of the cranial and facial portions, which 
seem based on insufficient data. 
