206 



GENERAL ORNITHOLOGY. 



Ei3 2 



■^&-^i 



Fiff 3 



/•fcjr *. 





Ml "•''^' 



Jl^.6. 



Fig. 101. — Respiratory and vocal organs of t)ie Rook, Corvus frugilegus, an Oscine Passerine bird; nat. size, 

 after Maogillivray. 1. a, tongue; 6, basi-brancliial, commonly called nro-hyal ; c, c, horns of byoid bone; d,<], 

 genio-hyoid muscles; e, e, stylo-hyoid muscles; /,/, cleido-hyoid muscles; 17, h, i. CESophagus; j, proventriculus : 

 or secretory stomach ; A., gizzard, or gigerium, the muscular stomach; Z, m, n, n, intestine, duodenum to rectum-. 



