1867.] DR. 3. E. GRAY ON THE RHINOCEROTIDiE. 1015 



the last or seventh grhider, but it wants the intermaxillaries. It was 

 purchased of a dealer, and has beeu 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 ; the 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. 



Hah. Sumatra {Raffles). 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 Stam- 

 ford Raffles, P.Z.S.), observing that "the cranium offers no indica- 

 tion 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 im- 

 proved it and increased its usefulness, not only to the zoological stu- 

 dent, 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 perma- 

 nent 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 



