94 THE 8ENSE OF TOUCH IN ANIMALS 



Myopotamus coypu (Fig. 84). — Section through thick epi- 

 dermis scales, papillae of the corium irregular, mostly low, a few 

 pointed. 



Hystrix cristatus (Fig. 85). — Epidermis smooth and very 

 simple, papillae of the corium low and broad, extending into the 

 epidermis only a short distance and separated by thick Driisen- 

 leisten. 



Erethizon dorsatus (Fig. 86). — Section through large nodules 



Fig. 82. — Alpine Marmot. Arctomys marmotta. x 30. Pes. Plantar 

 surface, pad at bases of D. 3, 4. Section longitudinal. 



on the plantar surface, each nodule with its sudoriparous duct 

 and small compound papillae of the corium. 



Ccelogenys paca (Fig. 87). — Epidermis divided into marked 

 nodules, each with numerous Driisenleisten and small papillae of 

 the corium. 



Hydrochxrus capybara (Fig. 88). — Section from pad on palmar 

 surface of fore foot, epidermis simple, papillae of the corium very 

 long and pointed. 



Lepus cuniculus (Fig. 89). — Section from the terminal phalanx 

 of a digit of the hind foot. Epidermis here thickly covered 

 with fine hairs and modified into long rod-like extensions to which 

 are attached the hairs. Papillae of the corium little developed. 



