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Show 1876.] DENTAL CHARACTERS OF RHINOCEROSES. 451 Rhinoceros, on the larger and lighter-coloured individual, retaining the name of R. sumatrensis for the smaller one, of which we have recently received a second example. This determination has been called in question by Dr. Gray ; and there are certainly some difficulties in deciding which of the two is the original R. sumatrensis of Cuvier (R. A. 1817), founded on Bell's description and figure in the 'Philosophical Transactions' for 1793, as that animal, if correctly drawn, must have been in some respects intermediate between our two living forms. On the whole, however, I am most inclined to think that the small and dark species (Dr. Gray's Ceratorhinus niger) is the nearest to Bell's Sumatran Rhinoceros, which is the view taken by Mr. Sclater. There is a skull in the Museum of the College of Surgeons (No. 2936), presented by Sir Joseph Banks, which is stated in the first edition of the Osteological Catalogue (1831) to have been the original of that figured by Bell in the ' Philosophical Transactions.' If this could be proved to be the case, it would satisfactorily determine the cranial characters of the true R. sumatrensis ; but the discrepancies between the figure and the skull are so great* that, with every allowance for inaccuracy on the artist's part, it is impossible to believe that they could be intended for the same ; and, indeed, the author of the second Catalogue (1853) appears to have come to this conclusion, as the reference to the Phil. Trans, is omitted in the description of the specimen. It is, however, extremely probable that the skull in question may have been sent to Sir J. Banks by Bell, as the latter had more than one specimen and was in communication with Sir Joseph, who presented his memoir to the Royal Society ; and therefore it may fairly be regarded as a representative of the same species. As long as the type of Sclater's R. lasiotis lives, the important question as to whether any osteological or dental characters are connected with the differences of external appearance cannot be determined ; and as m y present purpose is only with such characters, I must leave it out of consideration, and return to the eight skulls, four in the College of Surgeons, and four in the British Museum, that are available for examination. Of those in the first-named collection, three are probably from Sumatra, having been presented by Sir Stamford Raffles ; and the other is the one just mentioned, given by Sir Joseph Banks, probably also from Sumatra. Of those in the British Museum, the locality of one is not recorded ; one is from Pegu, having been purchased from Mr. Theobald ; one is from Borneo, as previously mentioned ; and the last is from the small dark-coloured animal, from Malacca, which died in the Society's Gardens in 1872, an aged female f. This differs from all the others in having no lower incisor teeth. Unless, as is probable, this is an * Chiefly as regards age, as shown by the teeth, and not differences of any specific value. t See Mr. Garrod's notes on its anatomy, P. Z. S. 1873, p. 92, where the remarkable difference between the structure of the mucous membrane of the intestine and that of R. unicornis is described. It is interesting to note |