DESCRIPTION OF SPECIES EXAMINED 133 



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Fig. 172. — Common Kestrel. Tmnunculus alaudarius. x 35. 

 Proximal phalanx, longitudinal section. 



D. 2. 



Fig. 173. — Raven. Cun-u-s curax. x 15. Pes. Pad at base oi D. 4. Scales 

 well-marked and rough ; imbrication distal, longitudinal section. 



Summary. — The foregoing results and descriptions may be 

 summed up briefly ; the explanation of the numerous variations 

 in the skin-structures will be left to the section which deals 

 with the physiological side of the matter. 



Of the three main elements of the skin here illustrated, 

 Dnisenleisten, papillary ridges, and papillas of the corium, the 

 first are seen in the course of a study of the various sections 



