COMMON CROSSBILL. 



Fig. 4. Head viewed from behind : a, right temporal 

 muscle ; i, great pyramidal muscle. 



5. Lower jaw, side view : a, cavity for articulation ; 



b, b, coronoid processes. 



6. Tongue seen from above : a, horny scoop ; 6, b, 



extensor muscles. 



7. Tongue, side view : a, horny scoop ; b, extensor 



muscles ; c, flexor muscle. 



VOL. 11. 



