FLYCHASERS AND ALLIED GENERA. 



5L3 



and deflected, the tip very narrow, deflected, and generally 

 curved over that of the lower, the notch very small or reduced 

 to a slight sinus. The lower mandible has the angle mode- 

 rately long, wide, and rounded, the back flattened or convex, 

 the dorsal outline slightly ascending and nearly straight, the 

 sides sloping outwards, flat at the base, convex towards the end, 

 the edges sharp and a little inflected ; the gape-line straight. 

 Although often very large, the bill is very light, the bony parts 

 being very thin, and the horny little more than a membrane. 







The mouth is wide; both mandibles internally moderately con- 

 cave, with a central prominent line ; the palate flat ; the pos- 

 terior aperture of the nares linear, and margined with rather 

 large papillae. The tongue, Plate XXII, Fig. 2, a, triangu- 

 lar, flat, emarginate and papillate at the base, the tip slit and 

 lacerated. The oesophagus, bed, gradually contracts at the 

 top, and is then of nearly uniform diameter ; the stomach, 

 de, is a roundish or broadly elliptical moderately compressed 



VOL. III. 



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