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Show 1867.] DR. J. E. GRAY ON THE RHINOCEROTIDAE. 1015 the last or seventh grinder, but it wants the intermaxillaries. It was purchased of a dealer, and has been marked "R. sondaicus, Cuvier, Java," by some previous possessor. The habitat may depend on the person having decided it to be R. sondaicus. The skull differs from 723c in the nasal being broader and more gradually tapering. 723 c is nearly in the same state of dentition, as the seventh molar is just appearing. This was purchased of a dealer, who said that he received it direct from Borneo. The forehead, nose, and especially the nasal bones are narrower than in the preceding. These skulls, from their size, indicate a species about the size or rather smaller than R. unicornis. ** Upper jaw much contracted and very narrow in front of the grinders. 4. RHINOCEROS FLOWERI. (Figs. 3, 4.) Skull:-the forehead and nose flat above, the nose rounded on the sides in front; the nasal bones very slender, rather more than two-fifths of the entire length of the nose and crown; the zygomatic arch convex, arched outwards, having a very large roundish cavity for the temporal muscles; lachrymal bone elongate, expanded on the cheeks; tbe upper jaw suddenly contracted and very narrow (only 2\ inches wide) in front of the grinders; the diastema very long, longer than in the adult R. unicornis, being 2 | inches long. Rhinoceros sumatrensis, Owen, Cat. Osteol. Prep. Mus. Coll. Surg. 506, no. 2934. Tennu, Raffles, Linn. Trans, xiii. 164. Hab. Sumatra (Raffies). Skull, Mus. Coll. Surgeons, no. 2934. A skull of this species is in the Museum of the Royal College of Surgeons, described by Professor Owen as above cited, who calls it the cranium of a male Sumatran Rhinoceros (presented by Sir Stamford Raffles, P.Z.S.), observing that "the cranium offers no indication of the short hinder horn of this two-horned species." It is so distinct in form and size that I have no doubt of its belonging to a most distinct species. I propose to designate it after the energetic Curator of the Museum of the College of Surgeons, who in the few years that he has had charge of the collection has wonderfully improved it and increased its usefulness, not only to the zoological student, but for professional studies. The skull is at once known from all the others I have examined by the convex prominent form of the zygomatics, and the contraction of the front of the upper jaw behind the cutting-teeth. It indicates a small species, not more than half the size of the common Indian Rhinoceros (R. unicornis). The skull no. 2934 is that of an adult animal with all its permanent teeth. It was named R. sumatrensis by Professor Owen: but it certainly is not a skull of that species ; for the occipital end of the skull is projected and the condyle produced, and, though the skull is that of an adult animal, there is no mark of the root of the second |