304 



EKINOCEROTID^. 



in front, and divides the internal nostrils. The lower jaw has the 

 incisors just developed, and slightly projecting beyond the alveolus ; 

 they are oblong, with a rather sharp edge on each side. There are 

 cavities for four grinders on each side ; the small first ones are lost ; 

 the second and third are equally developed, just projectiag and with 

 smooth enamel edges ; and the fourth are being developed, the crown 

 being sunk rather below the aveolar edge. 



Rhinoceros citculhitus (Wagner, Schreb. Siiugeth. vi. p. 317 ; Giebel, 

 Saugeth. p. 202), described from a specimen in the Munich Museum, 

 appears to be only a specimen of R. unicornis, with a second horn 

 added by the preserver. 



3. Rhinoceros nasalis. 



B.M. 



Skull elongate, the forehead and nose flat above, nose rounded on 

 the sides in front ; the nasal bones narrow, tapering, short, about 

 two-fifths of the entire length of the skull from the nasal to the 

 occipital crest ; the zygomatic arch flat ; lackrymal bone narrow, 

 oblong, erect ; the upper jaw only slightly contracted in front of the 

 grinders (3| inches wide). 



Ehinoceros nasalis, Gray, P. Z. S. 1867, p. 1012, figs. 1, 2 (skull). 



Hab. Borneo ? 



There are two not quite adult skulls in the British Museum (nos. 

 723 b and 723 c) which appear to belong to this species. They 

 slightly differ from each other ; but this may be sexual. They agree 

 with R. unicornis in the flatness of the crown, forehead, and nose, 

 and in the nose being rounded on the sides, and also in the slight 

 contraction of the upper jaw in front of the grinders, and in the 

 comparative flatness of the zygomatic arch. They chiefly diflPer from 

 the skull of that species of the same age, — 1, in the greater length 

 of the skull ; 2, in the breadth and flatness of the forehead ; 3, in 

 the line of the forehead not being so concave ; 4, in the comparative 

 slenderness and shortness of the nasal bones, they are only two-fifths 

 of the entu-e length of the skuU from the end of the nasal to the 

 occipital crest, while in the skull of R. unicornis, nearly of the same 

 age, in the College of Sirrgeons (no. 2975) the nasal bones are at 

 least four-ninths of the entire length. The nasal bones are narrower 

 and more tapering, their length being about once and one-half the 

 breadth of the base. The upper jaw behind the internasal is only 

 slightly contracted. They are at once known from R. javanicus by 

 the greater length and narrowness of the skull, and the rounded form 

 of the upper part of the nose, but they agree with the non-adult 

 skull of that species in the shortness of the nasal bones. 



The two specimens rather vary from each other in the width of 

 the nasal. 723 6 is a not quite adult animal ; it is just showing 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 skuU differs from 

 723 c in the nasal being broader and more gradually tapering. 



