86 



MARSH TERN. 



3^s a 



f 



twelfths long, papillate at the base, 

 the outer papilla on each side larger, 

 the tip sharp and horny. The oeso- 

 phagus, a b c, is 5 inches long, very 

 wide, its greatest diameter 9 twelfths. 

 The stomach, c d e, is oblong, 1 inch 

 2 twelfths in length, 10 twelfths in 

 breadth; its lateral muscles moderate. 

 Its contents are coleopterous and hy- 

 menopterous insects, together with 

 small crabs. The epithelium is thick, 

 strong, prominently rugous, of a red- 

 dish-brown colour, and exactly re- 

 sembling that of the smaller Gulls. 

 ,. The proventricular glandules are very 

 small, and form a belt ^ inch in 

 breadth. The intestine, f g h i, 

 which is 1 foot 8 inches long, is wide, 

 its average diameter being 4j twelfths. 

 The coeca, which come off at the dis- 

 tance of 2 inches from the anus, are 

 very small, being 3 twelfths long, and 

 1 twelfth in diameter. 



The trachea is 4 inches 2 twelfths 

 long, at the upper part 4 twelfths in 

 breadth, gradually contracting to 1^ 

 twelfths. The rings, about 110, are 

 feeble and unossified. The bronchial 

 rings are about 20. The contractor 

 muscle is so thin as to be scarcely 

 perceptible; the sterno-tracheal ex- 

 tremely slender. There is a single 

 pair of inferior laryngeal muscles. 



The stomach of another female 

 contains the remains of crustaceous 

 animals, one of which, nearly entire, 

 is a small roundish crab, 11 twelfths 

 in breadth. 



'St 



