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Show 444 PROF. w. H. FLOWER ON THE CRANIAL AND [May 16, distinct types, and no more, these three exactly coinciding with those described by Cuvier. Whether more species exist of which we have as yet received no specimens, or whether any of these types, as I have called them, represent several species separated by characters, external or anatomical, not available at present, I cannot say, especially in the prevailing uncertainty of the use of the word " species." I only mean to imply that there is nothing that I can distinguish in the materials at hand to justify their further separation. These three are (arranged according to size) : - 1 . R. unicornis, Linn., = R. indicus, Cuv. (R.A. 1817); 2. R. sondaicus, Cuv. (in Desmarest, M a m m . 1822), =• R. javanicus, F. Cuv. & Geoff. (Mamm., 1824); 3. R. sumatrensis, Cuv. (R. A. 1817). The skulls of these three species can be distinguished from one another at a glance, at any age. Leaving out numerous minor characters, for which I must refer to Side view of posterior part of skull of Rhinoceros sumatrensis. One fourth natural size. m, External auditory meatus; pg, postglenoid process of the squamosal; pt, posttympanic process of the squamosal; po, paroccipital process of the exoccipital. [All the figures are from specimens in the Museum of the Royal College of Surgeons.] the works previously mentioned, the skull of the last (R. sumatrensis) is separated from either of the others by a most readily recognized peculiarity in the structure of the squamosal bone, which I believe has not been generally observed. I should, perhaps, rather say that the peculiarity exists in the former two species, and that R. sumatrensis |