336 



SADKOPSIDA (BIRDS). 



feathers are in the wing attached to the bones of the hand : 

 these are known as " jmmari/ feathers" (fig. 174, A 1-10). 

 Another series arise from the ulna, the secondary feathers (B). 



V 





C 



Fig. 173. — Feather of Bird. 

 C, calamus ; H, rachis ; r, vexilluiii ; B, bai'b.?. 



There is a small thumb in the bones of the wing ; this is 

 also provided with feathers, and is called the "bastard wing" 

 (BW). The bases of these large wing-feathers are covered hy 

 smaller feathers, the " wing-coverts.'' The tail-feathers vary in 



