TREATMENT OF GAPES. 



133 



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

 devoured everything wliicli came in its way, consuming two 

 or three times as much as any other member of the brood. 



" The female worms extracted from the trachea have an 

 -average length of fths of an inch, the males scarcely 



Fig. 1. SpngaiiiKS trachcalis,ma.\e and femnle. 

 Natural size. 



Fig. 2. Upper part of the same, showing 

 more especially the six-lobed circular lip of 

 the female, and the mode of union. Enlarged. 



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

 with its mucronate caudal appendage, En- 

 larged. 



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

 showing the cup-shaped bursa, hard rays, 

 lateral jnuscles, 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. 



exceeding ^th 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 

 strong membranous sucker (Fig. 4) . The eggs of Syngamns 

 are comparatively large, measuring, longitudinally, as much 



