328 
THE POULTRY BOOK. 
cartilaginous rings, six in number, being united only by a thin layer of connective 
tissue. 
EXPLANATION 
Fig. 1. Sclerostoma syngamus, male and female. 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. Enlarged. 
OF WOOD-CUT. 
Fig. 4. Lower end of the body of the male, showing the 
cup-shaped bursa, hard rays, lateral muscles, digestive 
tube, and round tail. Magnified 30 diameters. 
Fig. 5. Mature egg. Magnified 220 diameters. 
Fig. 6. Egg, with contained embryo. Magnified 220 
diameters. 
‘‘ Keverting now to the worms extracted from the trachea, I observe, in the first 
place, that the females have an average length of fths of an inch, the males 
scarcely exceeding |-th of an inch. In both sexes the bodies are tolerably uniform 
in breadth throughout; and that of the female measures l-35th, whilst the 
transverse diameter of the male is only from l-60th to l-50th of an inch. The 
heads are relatively even more disproportionate. In the fresh state the mouth 
of the female was seen to be furnished with six prominent chitinous lips 
(fig. 2). 
In both sexes the surface of the body is quite smooth, but the female displays 
a series of spirally-arranged lines, which at first sight convey the idea of a natural 
twisting of the body ; this, however, is more apparent than real, being likewise 
more marked in some individuals than in others. The body of the female, 
towards the tail, exhibits a decided tendency to fold upon itself; and in one 
example this feature was very significant (fig. 3). The lower part of the body 
preserves a tolerably uniform thickness almost to the extremity, where it is sud- 
denly constricted to form a short narrow mucronate pointed tail, scarcely visible, to 
the naked eye. Employing a pocket-lens, it is easy to observe through the trans- 
parent integument the spacious digestive canal, surrounded on all sides by sinuous 
