1. SHIKOCBKOS. 307 



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 of 

 or rather smaller than R. unicornis. 



** Upper Jaw much cantr acted and very narrow in fronii of the grinders. 

 4. Rhinoceros Ploweri. 



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 

 2i inches wide) in front of the grinders ; the diastema very long, 

 longer than in the adult K. unicornis, being 2| inches long. 



Rhinoceros sumatrensis, Owen, Cat. Osteol. Prep. Mus. Coll. Surg. 



p. 506. no. 2934. 

 Tennu, Raffles, Linn. Tram. xiii. p. 269. 

 Rhinoceros Floweri, Gray, P. Z. S. 1867, p. 1015, figs. 3, 4 



Hah. Sumatra {Baffles). Skull, Mus. Coll. Surgeons, no. 2934. 



A skull of this species is in the Museum of the Eoyal College of 

 Surgeons, described by Professor Owen, as above cited, who calls it 

 the cranium of a male Sumatran llhiuoceros (presented by Sir Stam- 

 ford Eaffles, 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 skuU 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 

 Ehinoceros (R. unicornis). 



The skull no. 2934 is that of an adult animal with all its perma- 

 nent teeth. It was named B. swmatrensis by Professor Owen : but 

 it certainly is not a skuU of that species ; for the occipital end of the 

 skuU 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 

 horn, which is always weU marked in the adult skull of that species. 

 It is also distinguished from that species, as it is from B. unicornis 

 and B. javarvicus, by the convexity of the zygomatic arch and the 

 size of the cavity for the temporal muscles. 



It has been suggested that this skuU may have belonged to an 



x2 



