20 



CHARLES MIDLO AND HAROLD CUMMINS 



between specific configurations of epidermal ridges, pads, 

 and valleys of the volar reliefs has as its probable basis their 

 developmental dependence upon common factors of differential 

 growth (p. 157). 



The basic plan of configurational fields (figs. 3 and 4) is in 

 the main a counterpart of the pad disposition described above, 



4 



Fig. 3 Composite scheme of the palmar dermatoglyphics, illustrating the 

 morphologic plan of configurational areas. I, II, III and IV are interdigital areas, 

 designated by the respective numbers; II r is a field occasionally found on the 

 radial side of II, and IV" represents a similar accessory feature in close relation 

 to IV. The elements of the central area are termed 2", 3 P and 4", emphasizing 

 their proximal relation to the corresponding interdigital patterns. The hypothenar 

 area is represented with separate distal and proximal components, H d and H p . The 

 thenar (Th), occupying the thenar eminence, usually is separated from the 

 hypothenar configuration by a definite parathenar configuration (P-th). Variable 

 as are both configurations and volar pads, the conformity of configurational 

 topography and the pads shown in figure 1 should be noted. 



Fig. 4 Composite scheme of the plantar dermatoglyphics, illustrating the 

 morphologic plan of configurational areas. With the exception of the necessarily 

 different notations of accessory patterns II* and IV, the distal, central and 

 hypothenar portions of the sole correspond to the plan of the palmar dermato- 

 glyphics. The thenar territory occasionally presents a separation of distal and 

 proximal elements (Th d and Th p ), and on the heel a calcar pattern (C) occurs 

 occasionally. 



