42 



DISEA'SKS OF POULTRY, 

 C a 



In Fig. 6 D the 



worms are shown 



attached to the 



mucous membrane 



of the trachea. 



This is a drawing 



from the windpipe 



of a pheasant, that 



has been slit open 



to show the worms 



as they are found 



in affected birds. 



In this bird about 



thirty pairs of 



worms were found 

 in various stages of 

 development, and 

 it can be seen that the obstruction 

 of the air passage was almost or 

 quite complete. A larger drawing 

 of a pair of worms is seen in Fig. 7 

 E, which also illustrates the attach- 

 ment of the worms by means of their 

 mouths to the mucous membrane of 

 the trachea. A pair of worms is 



Fifr- S.— A pair of 

 sviigrames enlaffjed 

 seven liiametersl; «, 

 male ; /', female; A, 

 mouth of female seen 

 from its face ; 15, 

 mouth of female seen 

 from itb side. 



shown still more enlarged in Fig. 5 , in order to give some 



