82 THE SENSE OF TOUCH IN ANIMALS 



Carnivores — The terminal phalanges of Cercoleptes caudi- 

 vohulus (Fig. 105) and of Lutra vulgaris (Fig. 106) show well- 

 marked distal imbrication both of the rudimentary papillary 

 ridges, and highly developed papillae of the corium. In Mustela 

 vulgaris (Fig. 108) there is a distal slant of the papillae, but papillary 

 ridges are not developed. 



Primates. — It is among the Primates that imbrication of the 

 ridges, which, of course, in this order of mammals are much 

 more highly developed, shows itself most frequently. Ex- 

 amples may be pointed out in Fig. 118 of Lemur brunneus, with 

 proximal imbrication of ridges on the palmar surface. A very 

 striking instance is that in Fig. 135 of the skin of the palmar 

 surface of Papio porcarius ; here an interdigital pad is seen in 

 section which is made through a whorl at the apex of the pad, and 

 marked imbrication of ridges is visible, one each side of the whorl 

 towards the apex. Papio porcarius (Fig. 136) is another case of 

 distal imbrication of the plantar surface, Papio habouini (Fig. 137) 

 of imbrication on each side of an interdigital pad directed away 

 from the centre of the pad. Figs. 138, 139 of Papio mormon 

 and Fig. 140 of CynopitJiecus niger, are good specimens of distal 

 imbrication of the ridges, as well as the papillae of the corium. 

 Figs. 146, 147, 149 of Cercopithecus callitrichus show good ex- 

 amples of distal and proximal imbrication of ridges. Macacus 

 inuus (Fig. 142) shows well-marked proximal imbrication of the 

 skin of the tip of the third digit of the foot. 



Anthropoid Apes do not show any more marked instances of 

 imbrication than many of the lower members of the Simian 

 family. Fig. 152 of the Hoolock Gibbon may be noted, especially 

 Fig. 153, where a longitudinal section from the heel is shown 

 in which on one point in the surface the imbrication of the 

 ridges and papillae of corium diverges so that on the left of the 

 section the direction is proximal and on the right it is distal. 



The three Figs. 154, 155, 156 of an Orang show different 

 degrees and directions of imbrication of ridges. Fig. 154 of the 

 aborted pollex or D. 1 of this creature showing marked proximal 

 imbrication even of its low, ill-defined papillary ridges. The 

 sections from the skin of the hand and foot of man vary a good 



