Quadrupeds. 8509 



referred to R. africantis. Next, R. simus and R. keitloa, but, of 

 course, neither R. Oswellii nor R. Crossii. But what is his R. cucul- 

 latus, Wagler, unless an ill-stuffed R. sumatranus ? " R. cornubus 

 duobus, capite sensim elevato, plicis cutis profundis [!], clypeo scapu- 

 lari indiviso, supra latiori, epidennide verrucis parvis obsita. Capite 

 elongato, auriculis subcylindricis, labro elongato prehensili, cauda 

 mediocri. Hospitatur in museo Monacensi." 



From examination of an extensive series of skulls of Asiatic rhino- 

 ceroses it is impossible not to discern that there are three well-marked 

 species, each of which varies considerably in the shape of the cranium. 

 Of each there is a shorter and broader type, higher at the occiput, 

 wider anterior to the orbits ; and also a type the opposite of this, with 

 every intermediate gradation. This amount of variation in the existing 

 Asiatic species of the genus should induce caution in the acceptance 

 of all of the very numerous fossil forms that have been named by 

 palaeontologists. 



R. sondaicus and R. sumatranus are very inadequately represented 

 by the figures of skulls published by Cuvier and De Blainville. Those 

 of both authors represent the narrow type, as distinguished from the 

 broad type ; whereas their figures of the skull of R. indicus, the 

 R. unicornis of Linneus, represent an unusually fine broad example 

 of the species, doubtless the skull of the individual figured from life in 

 the * Menagerie du Museum d'Histoire Naturelle,' which gives a far 

 greater amount of contrast of appearance to the skulls of R. indicus 

 and R. sondaicus than exists in average specimens of those of the two 

 species. 



The skulls of R. indicus and R. sondaicus appear to differ only, 

 constantly, in the former being considerably larger, and having the 

 condyle of the lower jaw proportionally much more elevated, imparting 

 a conspicuously greater altitude to the vertex when the lower jaw is in 

 sitH. Both species would appear to exhibit precisely the same amount 

 of variation. On present evidence, which, however, I suspect to be 

 fallacious, it would seem that the broader type of R. sondaicus prevails 

 in Bengal, and perhaps the narrower far southward ; but we have both 

 from the Tenesserim provinces, and they completely shade into each 

 other, as equally in the analogous instances of R. indicus and R. suma- 

 tranus. 



In illustration of the skulls, I cite the figures of Cuvier and De 

 Blainville as exemplifying the broad-faced type of R. indicus, and a 

 very similar skull is that upon the skeleton of & female in the Museum 

 of the Calcutta Medical College. This female is one of a pair that 



