( 638 ) 



HERRING GULL. 



Larus argentatus, Brunn. 



PLATE CCXCI. Vol. III. p. 588. 



Male. The mouth is of the same structure as in Larus mari- 

 nus, 1 inch 4 twelfths in width. The tongue is 1 inch IQi twelfths 

 long, and similar to that of the species just named. Lobes of the liver 

 3 inches, and 3^ inches ; gall-bladder 1 inch 4 twelfths long, 8 twelfths 

 wide. (Esophagus 10^ inches long, at the commencement 2 inches 

 wide, on the neck 1 inch 1 twelfths, and within the thorax 2 inches ; 

 it is thus very wide, and its walls are of moderate thickness, the mus- 

 cular fibres distinct, and the inner coat longitudinally plicate. The 

 stomach is proportionally small, of an elliptical form, 2 inches long, 

 1 inch 9 twelfths in breadth, its lateral muscles thin. It contains bones 

 and scales of fishes. The epithelium in all respects as in Larus mari- 

 nus. Coeca ^ inch long, 3 twelfths broad ; cloaca globular, 1| inch in 

 diameter. Trachea 10 inches long, from 5 twelfths to 4 twelfths in 

 breadth, moderately flattened, its rings 150, feeble. Bronchi wide, 

 each of 28 half rings. 



COMMON AMERICAN GULL. 



Larus zonorhynchus, Richardson. 



PLATE CCXII. Vol. III. p. 98. 



Female, from Dr T. M. Brewer. Mouth 1 inch 1 twelfth in width ; 

 palate with two very prominent papillate ridges, the space between 

 which is covered with reversed papillae, its anterior part with five pro- 

 minent lines, and moderately concave ; the posterior aperture of the 

 nares, oblong-linear, 11 twelfths in length. Tongue 1 inch 5 twelfths 

 long, emarginate and finely papillate at the base ; its sides nearly pa- 

 rallel as far as the middle, its breadth being 3 twelfths, then tapering 



