668 



MR. R. I. POCOCK Olf THE EXTERNAL 



but the three iiiterdigital elements of the plantar pad ai^e small, 

 obscurely defined, circular tubercles widely separated from each 

 other. The four main digits, moieover, are longer and thinner 

 than in Sicista aud unevenly spaced, the third and fourth being 

 close together at the base, but the second is some distance from 

 the third, and the fifth from the fourth. The claws are compara- 

 tively long, and the sole of the foot is granular. The foot is a slight 

 exaggeration of the type seen in Apodemus sylvatictis, the common 



Text-figure 32. 



A. Right fove foot of Scarturtis tetradactylus. 



B. The same of Sicista subtilis (after TuUberg). 



C. The same of Zapus Iniclsonianus. 



D. The same of Apodemus sfflvatictis, for comparison with C. 



E. Kight hind foot of Sicista stibtilis (after Tullberg). 



F. The same of Zapus hudsonianus. 



G. The same oi Apodemus si/lvaticiis, for comparison with F. 



English wood-mouse, the third and fourth digits being conjointly a 

 little more removed from the second and fifth. (Text-fig. 32. C.) 

 The fore feet of the Jerboas (Jaculidae) seem to resemble very 

 closel}^ those of Sicista in a general way, except that the claws 

 are much longer, beitig generally very long, and the interdigital 

 elements of the plantar pad greatly reduced in size. In Scm^turus 

 they are represented by Ihiee widely separated circular papillae ; 



