88 



THE SENSE OF TOUCH IN ANIMALS 



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Fig. 63. — Potoroo. Potnrous iridac- 

 tylus. X 25. Pes, central D. Ter- 

 minal phalanx, proximal portion, 

 section longitudinal. 



Fig. 64. — Potokoo. Potorous tridac- 

 tylus. X 15. Pes, central D. 

 Terminal phalanx, distal portion, 

 section longitudinal. 



Fig. 65. — Potoroo. Potorous Iridac- 

 tylus. X 15. Pes. Plantar 

 surface, eminence on heel, section 

 longitudinal. 



Fig. 67. — Brush-tailed Wallaby. 

 Pctroqale ppnicillata. x 15. Pes. 

 Plantar surface, distal portion of 

 median region, longitudinal sec- 

 tion. 



Fig. 65. — Longitudinal section from the plantar surface 

 through an eminence over the heel. The epidermis is thickened 

 and shows no nodules or scales and the papillae of the corium are 

 closely-set and pointed. 



Petrogale penicillata. — Fig. 66 is a longitudinal section through 

 tesselated scales covering the terminal phalanx of a digit of the 



