160 FAUNA ANTIQUA SITALENSIS. 



The nasal arcli is massive and much developed ; the spring of this 

 arch is perpendicularly over the anterior of the second molar ; that is a 

 little more retired than in the Java or Indian rhinoceros skulls, given 

 in Cuvier's PI. IV. 



The breadtli of the palate has not been given in the table of dimen- 

 sions, because the first and seventh molars not being perfect on both 

 pides, measurements corresponding to those of Cuvier's could not be 

 obtained. It is comparatively less than in the existing species, but the 

 great breadth of the teeth compensates for this difference. 



Having detailed the essential differences and the jioints of resem- 

 blance observable in the fossil Indian rhinoceros when compared Avith 

 Cuvier's dimensions of the existing Indian rhinoceros, we must be 

 permitted to add, that additional measurements from skulls of the latter 

 species are requisite before anything certain can be pronounced as to 

 the amount of difference or correspondence between the two species. We 

 are induced to make this remark in consequence of having been favoured 

 Avith the examination of two craniums which presented considerable 

 variation of proportions when compared with Cuvier's and with each oth er . 



It appears to us desirable, therefore, to ascertain the limits within 

 which individual variations range before anything positive can be 

 asserted. The foregoing remarks will have showoi a great general 

 resemblance, accompanied by a departure of ^proportions in some corre- 

 sponding parts ; the latter may be sufficient for the establishment of a 

 new spe ies — at least for the present, until more data are obtainable 

 whence to determine the bounds by which the individuals of one species 

 are limited in their variations. For the sake of distinction, therefore, 

 and present convenience, at the same time keeping in view the type 

 to Avhich it is a near approach, we have termed the species under con- 

 sideration the R. Indicus fossiUs. 



Teeth. — The remark has been already passed, that the greater num- 

 ber of fossils obtained from the Moginund deposit are the remains of 

 young animals ; with the rhinoceros this has been particularly the case. 

 We accordingly find oiu-selves better able to illustrate the early stage 

 of dentition than that moie advanced. 



Fig. 1 contains the four milk molars of the left maxilla ; the 

 fourth being but just cut is unworn ; but the palate being broken away 

 from the base of the tooth, more of it is seen than would otherAvise be 

 the case ; in the right half of the specimen, Avhere the palate is whole, 

 the fourth molar is more concealed. The first molar is also unAvorn, 

 but the second and third haA'e suffered detrition. The tAvo rows of 

 teeth have their internal base lines parallel to each other, and the lines 

 which Avould circumscribe their exterior much curved, in consequence 

 of the difference of breadth which exists amongst the teeth. The upper 

 part of an imAvorn tooth, measured exteriorly, is much longer than the 

 lower ; for the anterior of each molar projects beyond the posterior 

 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 Avear doAvn, this outer development is reduced, the internal 

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

 pensation for the diminished length of surface in Avear. 



Fig. 5, PL XIX. The sixth molar from a left maxilla. The spur, 

 Avhich occupies no inconsiderable part of the hollow betAveen the 



