GAPEWOBM IN PHEASANTS. 



12/ 



healthy birds had attained considerable size, and averaged 

 9^ ounces ; the infested chicken weighed only 4 ounces ; but, 

 as if to make up for its defective assimilating powers, greedily 

 devoured everything which came in its way, consuming two 

 or three times as much as any other memter of the brood." 



Fig;. 1. SyngamuBtracheaU8,jn&leajid.teTsa&le. 

 Natural size. 



Fig. 2. Upper part of the same, showing 

 more especially the sixlobed circular lip of 

 the female, and the mode of union. Enlarged. 



Fig. 3, Lower end of the body of thefemale, 

 with its mucronate caudal appendage* En- 

 larged. 



Fig. 4. Lower end of the body of tlie male, 

 showing the cup-ehaped bursa, hard rays, 

 lateral muscles, digestive tube, and round 

 tail. Magnified 30 diameters. 



Fig. 5. Mature egg. Magnified 220 dia- 

 meters. 



Fig. 6. Egg, with contained embryo. Mag- 

 nified 220 diameters. 



'' The female worms extracted from the trachea have an 

 average length of fths of an inch^ the males scarcely 

 exceeding Jth of an inch. In both sexes the bodies are 

 tolerably uniform in breadth throughout. The mouth of 

 the female is furnished with six prominent chitinous lips 

 (Fig. 2). The male is usually found fixed by means of a 



