494 Sub-Himdlayan Fossil Remains [Aug, 



extremity of the one immediately in its front by the gradual enlarge- 

 ment of the external line of enamel from the base to the summit. As 

 the molars wear down, this outer development is reduced, the internal 

 sides of the teeth come more into use, and breadth is gained in 

 compensation for the diminished length of surface in wear. 



Fig. 2, PI. XIX. is a fragment from a right maxillary, containing the 

 1st, 2nd, and 3rd milk teeth, more worn than the corresponding 

 molars of fig. 1. The 1st teeth in these two specimens are dissimi- 

 lar ; but that of fig. 1 not having completely disengaged itself from 

 the jaw-bone, a strict comparison cannot be made between the two. 

 The detrition which the remaining teeth have undergone does not 

 prevent the trace of their enamel from being found to agree with that 

 of the analogous molars of fig. 1. 



A still further advanced state of wear is figured in fig. 3, which is 

 taken from a cranium to which the occiput and anterior of the nasal 

 bones are wanting. The 5th molar is here on the point of appear- 

 ance ; the four first are much worn, particularly the first and second ; 

 but there is no difficulty in tracing the correspondence between the 

 molars of this and of the preceding specimens. 



The above three exemplars of the deciduous dentition we assign to 

 the fossil Indian rhinoceros, from the circumstance of their having 

 been found in company with bones the forms of which clearly pointed 

 out the species which they must have resembled. The disposition of 

 the molars also corresponds with that observable in the cranium PI. 

 X V. where the same parallelism, of internal base line and arched ex- 

 ternal bounding line, exists. To which maybe added, that the frontals 

 of the cranium to which the molars of fig. 3 belong, evince no sign of 

 having borne a horn. 



Between the worn state of the deciduous molars exemplified by 

 fig. 3, and the worn state of the permanent molars figured in PI. 

 XV. we have no connecting links, excepting such as may be obtained 

 from a few detached teeth which appear to have belonged to this 

 species — these are, 



Fig. 5, PI. XIX. The sixth molar from a left maxillary. The spur, 

 which occupies no inconsiderable part of the hollow between the 

 anterior and posterior transverse hillocks, is here less curved than that 

 of the Indian rhinoceros ; and there is wanting altogether the small 

 salient of enamel, which in the Indian rhinoceros occurs between the 

 starting point of the above mentioned spur and the point of junction 

 of the exterior and anterior main lines of enamel. It may also be 

 mentioned, that the exterior and posterior lines of enamel being less 

 thick than the corresponding parts of the sixth molar of the Indian 



