1026 DR. J. E. GRAY ON THE RHINOCEROTID^. [DeC. 12, 



I have not seen the skull of this species, nor do I know any spe- 

 cimen existing in museums, unless the one described by Camper 

 still exists. 



" The length of the head of R. keitloa, in proportion to the depth, 

 is very different from that of R. hicornis. Upper lip distinctly pro- 

 duced ; inside of the thigh black. The horns are of equal length 

 and development in the young animal." — A. Smith. 



This species is peculiar for the length of the hinder horn ; but 

 Schinz describes the front horn as very long, and the hinder short, 

 conical. 



Peter Camper, in 'Act. Petrop.' (1/77, part 2, p. 193), described 

 the head of a two-horned Rhinoceros whicli he received from the 

 Cape of Good Hope. He figures the head and the skull in great 

 detail. The upper lip has a distinct central process, or prehensile 

 lobe; and the horns are both compressed and sharp-edged before 

 and behind, the front one is the longest and regularly curved, the 

 hinder well developed and elongate. The end of the nose of the 

 head and skull is rounded and not square, and the nasal bones are 

 not truncate, as in the skulls of R. simus in the British Museum. 

 I believe Camper's to be the first description of i2. keitloa of Dr. A. 

 Smith. 



Schinz gave the name of R. camperi to a species which he says is 

 R. bicornis of authors, and which is figured by A. Smith under that 

 name in the ' Illustrations of South Africa ;' but he describes the front 

 horn as very long and recurved, and the hinder horn as small, tri- 

 quetrous, compressed ; while the hinder horn of R. bicornis is always 

 conical, subcylindrical, with a circular base. Schinz's R. camperi 

 appears to be a compilation from the figures of Sir A. Smith's R. bi- 

 cornis and Camper's description and figure of the head of R. keitloa. 



P. Camper, in giving the figures of this species, properly made 

 the drawings like a diagram, without attending to the rules of per- 

 spective, so that the compass can be applied to any part. He gives 

 a particular name to these figures, and calls them Catograph. 



In Camper's figure the length from the back edge of the seventh 

 molar to the front edge of the small intermaxillary is considerably 

 greater than the distance behind the hinder edge of the last molar to 

 the occipital condyle. In De Blainville's figure of R. simus, and in 

 the two specimens in the British Museum, the length from the hinder 

 edge of the seventh molar to the front edge of the small intermaxil- 

 lary is rather less, or about the length behind the hinder edge of 

 the seventh molar to the outer part of the occipital condyle. 



The Keitloa is recognized as a species distinct from R. bicornis 

 by the tribes of natives ; they have a diflFerent name for the two 

 species. 



If Cuvier had had a series of the skulls of R. bicornis, or had seen 

 a preserved specimen of the two animals, he would never have 

 thought that the skull figured by Camper was the adult of R. bi- 

 cornis. The skulls of the different species alter very little in form 

 during the growth of the animal, when they have passed the very 

 youngest, nearly foetal, state. 



