396 



MR. K. I. POCOCK OX THE EXTERNAL 



median seiuicii'cular pad near the centre of the area some 

 distance behind the plantar pad. In a wild- caught example 

 of Cavia aperea, the feet agree in all essentials with those; of 

 C poTcellus ; as also do those of Galea. 



Text-figure 15. 



A. Right fore foot of Kerodon rupestris, from dried skin. 



B. ,, hind .. 



C. ,, fore foot of Lagidium peruanum „ ,, 



D. „ hind ., 



The feet of Kerodon differ from those of Cavia in some 

 respects. The number and disposition of the digits is the same, 

 but the claws are much shorter and blunter, especially on the 

 fore foot. The digital pads are larger, compressed, and some- 

 what pointed at their distal ends. The plantar pads are very 

 large, well-defined, cushion-like thickenings, separated by a short 

 strip of wrinkled integument from the carpal and metatarsal 

 pads. The carpal pads are very well developed and two in 

 number, a larger outer and a smaller inner, the two together 



