THE YELLOW-THROATED VIREO. 



143 



emarginate and papillate at the base, flat above, tapering to a horny, deeply 

 slit, lacerated point. The width of the mouth is 4^ twelfths. The oeso- 

 phagus is 1 inch 9 twelfths long, funnel-shaped at the 

 commencement, at the distance of half an inch its 

 width is If twelfths, and thus continues until it enters 

 the thorax, soon after which it enlarges to form the 

 proventriculus, of which the breadth is 3 twelfths. 

 The stomach is of moderate size, of a broadly elliptical 

 form, considerably compressed; its length 6 twelfths, 

 its breadth 5 twelfths, its muscles pretty large and 

 distinct, its tendons of moderate size; the epithelium 

 thin, reddish-brown, with eight longitudinal rugae on 

 one side, and five on the other. The belt of proven- 

 tricular glandules is 2| twelfths broad. The intestine 



is 5i 



inches long, from 1^ twelfths to 1 twelfth in 



width, the rectum 2 twelfths at first, the cloaca globu- 

 lar, about 4 twelfths; the coeca 1| twelfths long, about 

 ^ twelfth wide, and placed at the distance of 9 twelfths 

 from the extremity. 



The trachea is 1 inch 2 twelfths long, from 1 twelfth 

 to f- twelfth in width, moderately flattened, its rings 

 rather firm, about 50, with 2 dimidiate; the muscles 

 disposed as in the Thrushes and Warblers, there being 

 four pairs of inferior laryngeal on each side, besides the sterno-tracheal. 

 The bronchi short, slender, of about 10 half rings. 



The Swamp Snowball. 



Hydrangea qxtercifoua, Willd., Sp. PI., vol. ii. p. 634. Pursh, Flor. Amer. Sept., vol. 

 i. p. 309. — Decandria Digynia, Linn. — Saxifrage, Juss. 



This plant is found on the broken sandy banks bordering small water- 

 courses, and is abundant in such situations in the uplands of Louisiana. It 

 seldom grows beyond the size of a bush. The blossoms are lasting, and 

 although without odour, are pleasing to the eye, on account of their pure 

 white colour when first expanded; they dry on the stalks, retaining their 

 form, and remaining until winter. The species is characterized by its 

 oblong, deeply sinuate leaves, which are downy beneath, and its radiated 

 loosely thyrsiform cymes. 



