1028 DR. J. E. GRAY ON THE RHINOCEROTID^. [DcC. 12, 



There is a well stuffed young specimen of this species in the 

 British Museum, and two skulls of adult and two of very young 

 animals. 



In the Museum of the Royal College of Surgeons is a very fine 

 adult skull of this species (no. 2960 a) with the two horns attached 

 to the skin. It was obtained from Mr. Gordon Cumming's collection. 

 It is 3.5 inches long from the end of the nasal to the occipital crest. 

 The front horn is very long, slender, straight, and recurved ; the 

 front edge of the horn is worn by the animal rubbing it on the ground. 



De Blainville obtained, when he was in London, from Mr. Burchell 

 the drawing of the head of this species (engraved in the ' Journ. de 

 Physique ') ; but the horns were added after it passed out of Bur- 

 chell's hands, and are not the horns of the species. 



In the British Museum there are two skulls of very young animals 

 of this species that were received with the adult skulls in the collec- 

 tion ; the milk-grinders are being formed, but could only just have 

 been seen through the gums. The skulls are elongate, subcylindrical, 

 and have a rounded nose, with a large nearly hemispherical promi- 

 nence near the end of the upper surface for the support of the front 

 horn. The grinders are very large compared with the size of the 

 skulls, and occupy a great part of the cavity of the mouth ; the hinder 

 one is placed in the centre of the length of the underside of the skull 

 from the nose to the condyles. The larger of these young skulls 

 (1003 b) is very like the smaller one, but there is a fourth grinder 

 being developed behind the third one ; it is not elevated above the 

 edge of the alveolus, and has no smooth enamelleil edge. The small 

 first grinder is only very little more developed than in the smaller 

 skull. The line of grinders occupies (ij inches. The intermaxil- 

 lary bones are deficient. The palate ends, as in the smaller skull, 

 in a line even mth the back edge of the third grinder. The hinder 

 part of the skull has lengthened more rapidly than the part in front 

 of the edge of the palate. The nasal is slightly longer compared 

 with the length of the skull than in the smaller specimen ; they are 

 41 inches long, the entire length being very nearly 14 inches — that 

 is to say, nearly three-tenths of the entire length. The front of 

 the nasal is more dilated on the sides, and becoming broader and 

 more truncated as in the adult skulls. 



The lower jaw of this specimen is considerably longer than the 

 other ; and there is little difference in the state of the teeth, except 

 that the second and third grinders on each side are higher out of 

 the gums, rather more worn on the edge, and the first and fourth 

 grinders are rather more developed and larger, the first on the two 

 sides not being quite equally developed, but one more exposed than 

 the other. 



The smaller specimen (1003 c) has three grinders appearing ; the 

 smallest front one is least developed, hardly raised above the alveoli, 

 and not showing any smooth enamel ; the second and third grinders 

 are nearly equally developed, the ridges being high and edged with 

 enamel, the rest of the teeth are minutely rugulose ; the hinder 

 edge of the third grinder is on a line even with the front edge of the 



