672 



MR. K. I, POCOCK ON THE EXTERNAL 



Jaculus jacidus. They conceal the claws from the lower aspect 

 of the foot, but these claws are smaller than in J. jaculus and 

 ;S'. orientalis. The plantar papilla, moreover, is a large conical 

 eminence. The three main digits of Allactaga inclica resemble 

 those of Scarturus tetradactylas in the comparatively scanty 

 development of hairs on the under side ; but the pads do not 

 appear to be so large*. Nevertheless, the plantar papilla is a 

 large conical eminence as in t^cartioncs. (Text-figs. 33, 34.) 



In the four species of this group above described the claw of 

 the median digit is considerably smaller than those of the lateral 

 digits. 



Text-figure 34. 



A. Right hind foot of Scarturus tetradactyhis, from outer side. 



B. Lower view of same, with digits closed together. 



C. Right hind foot of Allactaga inclica, from outer side. 



D. The s.ame of Scirtopoda orientalis. 



E. Lower view of the same, with digits closed. 



The hind foot of Pedetes, although saltatorial, has the meta- 

 tarsus much shorter in relation to the length of the digits than 

 in the Jaculidie ; but it resembles the hind foot of the latter in 

 having the third digit the longest, set in the middle line, and 

 flanked on each side by the second and fourth ; and, as in the 

 Jaculidae, the under side of the digits and mostly of the meta- 

 tarsus is naked, but covered with the hairs which overlap them from 

 the sides. As in Scarturus, there are four digits, the first having 

 entirely disappeared, while the fifth is retained. But, aj-.art from 



* The only specimen examined had l)een for many years in alcohol, and possibly 

 the pads were shrunken in size. 



