226 PLUMED PARTRIDGE. 



with three knobs or valves. The intestine is of moderate length and 

 diameter, being 3 feet 7 inches long, its diameter in the duodenal por- 

 tion 5 twelfths, but gradually diminishing to 1^ twelfth. The rectum 

 is 4 inches long, its width 5^ twelfths ; the cloaca globular, 1^ inch 

 long, 1^ in breadth. The coeca 3 twelfths long, 1^ twelfth in dia- 

 meter. 



The trachea is 5\ inches in length, much flattened, its breadth at 

 the upper part 4 twelfths, at the lower 3 twelfths. Its lateral or con- 

 tractor muscles are very thick, and terminate in the sterno-tracheal at 

 the distance of about 5 twelfths from the inferior larynx, sending down, 

 however, a thin slip on each side to the first bronchial ring. There 

 are no other inferior laryngeal muscles ; and, like that of the other fal- 

 conine birds, this trachea is of the most simple structure. The rings 

 are 88 ; the bronchial half rings about 20. 



In a female individual, the oesophagus is 7^ inches long ; the crop 

 3 inches by 2| ; the stomach 2^ inches in diameter ; the intestine 3 

 feet 8 inches long, the cceca 3 twelfths by 1^ twelfth, the cloaca 2 inches 

 in diameter when inflated. This individual had only one arvicola in 

 its stomach. 



PLUMED PARTRIDGE. 



Perdix flumifera. 



PLATE CCCCXXIII. Male and Female. 



Of this beautiful bird little, I believe, is known. The following 

 notice by Dr Towjjsend shews that it is entitled to a place in our 

 Fauna. " This bird inhabits the dense woods along the tributary 

 streams of the Colimabia River, and is said to extend south into Cali- 

 fornia. It is at all times a very scarce species, going in coveys of from 

 six to ten, and is rarely seen away from its favoiu-ite places of resort. In 

 all my rambles through the Oregon Country I was never so fortunate 

 as to meet with this pretty bird, the three specimens which I have re- 

 ceived having been procured for me by others." 



One of these specimens has been forwarded to me by Dr Town- 



