662 



MR. R. I. POCOCK ON THE EXTERNAL 



He describes the anterior border of the nostril as thickened, 

 with a small wart beneath it [? the nostril], and the space between 

 the nostrils as narrow, marked by a well-developed vertical ridge, 

 and the vipper lip as having no groove in front. 



In Jaculus, S'cirtopoda, and Scarturus the rhinarium is very 

 like that of Zapus, showing a similar thickening of the upper and 

 inner rim and a median groove, but the area below the rhinarium 



Text-fieure 30. 



:^'W''/?v>t.- 





A. Muzzle and I'liinarium of Zapus hudsoniaims. 



B. ,, „ Scirtopoda orientalis. 



C. The same, contracted. 



1). Muzzle and iliinarium of Jaculus jaculus, to show especially the papillae, 

 slightly enlarged and cleared of hair, carrying the long stout vibrissfs. 

 E. Muzzle and rhinarium of Pedetes caffer. 



in the middle line is naked and constitutes a kind of shallow 

 philtrvim. Of the muzzle of this genus, Anderson and de Winton 

 said: — "Over the bare area of the nose of Jaculus there is a 

 thickened fold of skin capable of being drawn forwards, so as 

 almost to cover the nostrils, this structure serving to protect them 

 when the animal is using its broad snout to push out the earth 



