INTRODUCTION 7 



agrestis (Field Mouse). These she calls, Apical, Interdigital and 

 Proximal. 



In Figs. 1 and 2 they are marked as follows : 



A. Apical of which there are five. 



I. Interdigital of which there are four. 



P.P. Proximal of which there are two. 



7^ 



HYPOTHENA' 



THENAR REGION 



Fig. 1. — Diagram op Topography of Manus. (Azara's Opossum.) 



These eleven primary pads are very general in the MammaUan 

 hand and foot, and are rightly looked upon by Dr. Wilder and 

 Miss Whipple as essentially tvalking-pads. They are found as 

 low down in the Mammahan series as Marsupials and in forms 

 which do not employ the hand and foot for prehension. These 

 pads situated on the tips of the digits, interdigital spaces, and 

 proximal portion of the hand and foot are of great value to the 

 animal possessing them, on account of their " buffer " action. 



