OF THE CLASS MAMMALJA. 241 



sinuses, and thus receiving into their interior the external 

 air. 



[The double-horned rhinoceros, a South African species, dis- 

 covered by Burchell. The 

 double-horned rhinoce- 

 ros was re- discovered by 

 Sparrman, after its me- 

 mory had been lost to 

 Europe since the days 

 of Trajan and Severus. 

 It was known to the 

 poet Martialis, who de- _. 



scribed its double-horn. 

 But having been lost to 

 Europe for so many cen- 

 turies, commentators on 

 Martialis suggested that 

 the poet's text had been 

 corrupted, and upon this Fi S- 199.- Double-horned Khinoceros. 



they introduced many 

 ingenious alterations, not one of which was true. R. K.] 



Fig. 200. Klip-das. 



[The Cape Dassar, or 

 hyrax. Cuvier had the 

 merit of transferring 

 this curious little animal 

 (not larger than a rab- 

 bit) from the erroneous 

 position in which all 

 preceding zoologists had 

 placed it, to the order 

 pachydermata. R. K.] 



The mode of forma- 

 tion of the horns called antlers is as follows : At a cer- 



Fig. 201. The Cape Dassar, or Hyrax, 



