GAPES. 



139 



" Parisitic Diseases of Poultry." Mr. Theobald describes the 

 ova and embryos as escaping by the rupturing of the female's 

 body, which takes place, as a rule, after the worm has been 

 expectorated by the fowl or pheasant. Both eggs and 

 embryos, as suggested by Dr. Cobbold, take up their abode 



Syngamus trachealis. SIEBOLD. 

 Sclerostoma syngamus. DIKSING. 



Fig. 1. tiyngamnstrachealit,ma.Ieaind female. 

 Natural .size. 



Fig. 2 Upper part of the same, showing 

 more especially the six-lobed circular Hp 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 cap-shaped 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. 



in damp ground, that around the drinking vessels of the 

 fowls being a favourite locality. 



The eggs hatch in from seven to forty days, according 

 as to whether the surroundings are favourable or not. 



