CHAPTER II 



DESCRIPTIONS OF SPECIES EXAMINED 



Before entering upon the detailed description of the various 

 sections here represented, it is necessary again to state that only 

 the more prominent features of the skin-structures will be dealt 

 with, viz., the papillary ridges or their equivalents, the papillse 



Fig. 56. — Azara's Opossum. Didelphys azarce. x 25. 



Pes. Plantar surface, pad at base of D. 1 through 



a whorl of papillary ridges. 



of the corium, and the Drlisenleiste. The various outhnes and 

 groupings of these structures and especially the two first, alone 

 concern the subject of the sense of touch, from the present point 

 of view. 



