EIDER DUCK. 



613 



spicuous, the inner coat longitudinally plicate. The left lobe of the 

 liver is 2 inches 2 twelfths Fig. 2. 



long, the right lobe 4 inches. 

 The gall-bladder elhptical, 



1 inch 5 twelfths in length, 

 11 twelfths in breadth. The 

 stojna,ch, cde/ffh, is a gizzard 

 of enormous size, placed ob- 

 liquely transversely ellipti- 

 cal, its length 2i inches, its 

 breadth 3 inches. The pro- 

 ventricular glands are ex- 

 tremely numerous, and form 

 a belt 2 inches in breadth. 

 The left muscle of the sto- 

 mach, de, is 1| inch thick, the 

 right, gk,l inch 2 twelfths ; 

 the epithelium very thick, 

 and of a horny texture, with 

 two elliptical convex grinding 

 plates, of which the right is 



2 inches in length, the left 

 1 inch 7 twelfths. Intes- 

 tine 74 inches long ; the 

 width of the duodenum, hij, 

 ^ inch, diminishing to 5 

 twelfths ; the rectum, Fig. 2, ab, 7 twelfths in width ; the coeca, cc, 3^ 

 inches long, 4 inches distant from the extremity ; their greatest width 

 4i twelfths, for an inch at the base only 1 twelfth ; the cloaca very 

 slightly dilated, its breadth being only 8 twelfths. 



The trachea is 9i inches long, nearly of the uniform width of 5 twelfths, 

 moderately flattened ; the rings 130, well ossified, ending in a trans- 

 versely oblong dilatation, projecting more toward the left side, 1 inch in 

 breadth, | inch in length. Bronchial half rings 32, the bronchi very 

 wide, rings very narrow and cartilaginous. The contractor muscles 

 are very large, and expanded over the whole anterior surface. At the 

 distance of 1 J inch from the tympanum they give off the cleido-tracheal 

 muscles, and at the tympanum itself the sterno-tracheal. 



