IDS LECTURE III. 



of the Eastern and Southern parts of the world - y 

 frequenting dry and sandy places, where it burrows 

 under the surface and conceals itself during the 

 day, coming out to feed during the night. Its 

 general attitudes are those of a bird, hopping on 

 its hind-legs, and when, pursued, springing, by 

 vast and quickly repeated leaps, to a great dis- 

 tance, so as not to be easily overtaken by the 

 swiftest of quadrupeds. The general size of the 

 common Jerboa is that of the common or brown 

 Rat, and its colour pale yellowish-brown, white 

 beneath ; the tail very long, and elegantly ter- 

 minated by a feather-shaped tuft, of a black co- 

 lour, tipped with white. It is well represented 

 in the works of Bruce, Buffon, Edwards and 

 other modern authors. 



The genus Hyrax, which concludes the Order 

 Glires, is of rather late institution, and consists of 

 two species, each about the size of a common 

 Rabbet, and of nearly similar colour. The genus 

 Hyrax differs from all the rest of the Glires in the 

 front teeth of the lower jaw, which, instead of 

 two, are four in number, rather broad, and 

 notched at the edges or tips. Of the two species 

 of Hyrax, one is the Ashkoko of Mr. Bruce, which 



