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INTRODUCTION. 



Fig. 8. Section of Proventriculus. 



fl, a, its outer coats. 

 b, its inner coat. 



The cylindrical glandules are seen 

 between them. 



Fig. 9. Glandules of natural size. 



Fig. 10. Inner surface of Stomach. 



The soft epithelium, or inner coat, ele- 

 vated into tortuous rugse. 



Fig. 11. Valve of pylorus. 



Plate V. Digestive Organs of the Snowy Owl, Spnia Njctea. 



Fig. 1. Tongue, Trachea, Intestinal 

 Canal, Heart, and Liver. 



a, tongue. 



b, b, hyoid bones. 



c, d, trachea. 



e, e, bronchi, or division of trachea. 



f, heart, with pericardium removed. 



g, h, lobes of liver. 



i, abdominal parietes. 

 J, two air-cells. 



b, 1c, I, oesophagus, very wide, without 

 dilatation or crop. 



Fig. 2. Digestive Organs concealed in 

 Fig, I. 



I, m, n, lower part of oesophagus. 



m, proventriculus. 



n, 0, stomach. 



n, its muscular fibres. 



o, one of its tendons. 



p, pylorus. 



p, q, r, duodenal fold of intestine. 



s, s, pancreas. 



r, extremity of intestine. 



Fig. 3. Tongue, and aperture of Glottis, 

 a, b, tongue, having the base emarginate 

 and papillate, the tip notched. 



Fig. 4. Part of inner surface of Pro- 

 ventriculus. 



Fig. 5. Longitudinal section of Pro- 

 ventriculus, shewing the apertures 

 of the Glandules. 



Fig. 6. Three proventricular Glandules 

 of natural size. 



Fig. 7. Inner surface of Epithelium or 

 lining of Stomach, shewing tor- 

 tuous inigcB. 



Fig. 8. Rectum, Cloaca, and Cceca. 

 a, a,f, coeca, enlarged towards the an- 

 terior extremity. 



a, a, b, rectum. 



b, c, cloaca. 



d, d, ureters, entering at e, below which 

 is seen the larger aperture of the 

 bursa of Fabricius. 



