NEMATODE WORMS. 71 



The ova of a Fluke have also been found in the 

 albumen of an egg by Bonnet (Jahrb. d. k. central. 

 Thierarznei-Schule in* Munchen, 1881) . This Fluke 

 is also found in the bursa of Fabricius. 



C. Nematode Worms. 



The round worms or Nematodes, the Thread- 

 worms of popular language, are by far the most 

 injurious worms to the Fowl ; for in this family we find 

 present the much dreaded Red Forked Worm or the 

 Gape-worm (fig. 22), often so pestilential amongst 

 Poultry and Pheasants. Others, the 'White Worms'' 

 of the intestines, also produce epizootic maladies in 

 chicks. 



No less than eighteen species are recorded as 

 parasitic in the Fowl. Most of these live in the 

 intestines ; some, however, in the proventriculus, 

 gizzard, oesophagus, and the eye; and the Gape-worm 

 in the respiratory passages. 



Characters of Nematodes. 



The Nematodes are round worms and, unlike the 

 Cestodes, are provided with a mouth, alimentary 

 canal, and anus. They are usually elongated, slender, 

 and thread-like in form. 



The sexes are separate, the female generally being 

 larger than the male. The latter also has, as a rule, 

 a curved anal extremity and two curved spicula 



