110 THE SENSE OF TOUCH IN ANIMALS 



close and pointed, extending up near to the free surface of 

 the epidermis. 



Fig. 115. — From a terminal phalanx of a digit of the forefoot, 

 and showing smooth epidermis and well-defined Driisenleisten 

 and papillae of the corium especially on right-hand side of the 

 section. 



CHIROPTERA. Pteropus medius (Fig. 116).— Longitudinal 

 section from a terminal phalanx of hind foot wnth smooth 

 epidermis and fine-pointed papillae of the corium, Driisenleisten 

 thick and well developed. 



PRIMATES. Lemur hrwineus. — Fig. 117 represents the 

 skin-structures at the tip of the terminal phalanx of a digit of 

 the forefoot. A longitudinal section commencing on the right 

 hand of the drawing, close to the nail and passing through the 

 pulp of the digit ; about midway, the section is seen to be in the 

 hne of the papillary ridges which are here nearly longitudinally 

 placed. The right-hand portion shows very marked papillary 

 ridges, long and pointed Driisenleisten, and papillae of the corium 

 bifurcated by the latter. The left-hand portion has a different 

 relation, viz., a parallel one, to the papillary ridges and shows 

 very little. 



Fig. 118. — A longitudinal section from the palmar surface 

 through an eminence on the radial side of the forefoot. The 

 papillary ridges well marked and show a proximal imbrication. 

 The Driisenleisten are long and pointed and papillae of the 

 corium bifurcated. 



Fig. 119 is a similar section from the ulnar side of the same 

 forefoot. 



Figs. 120, 121 show transverse and longitudinal sections of 

 the terminal phalanx of the third digit of the hind foot — each has 

 closely set papillae of the corium, papillary ridges, and large 

 Driisenleisten, but the transverse section (Fig. 120) shows the 

 papillae of the corium more pointed and closely-set than the 

 longitudinal. 



Fig. 122 is a transverse section of the terminal phalanx of 

 a digit of the hind foot. In this section the papillary ridges 

 are marked and the papillae of the corium particularly long 



