"GROUSE DISEASE "STRONG YLOSIS 



207 



OB.- 



FIG. 18. Male Tricho- 

 strongylus pergracilis, showing 

 m mouth, alimentary canal, 

 spicules, and genital bursa. 

 Magnified. 



FIG. 19. Female T. pergra- 

 cilis, showing an. anus ; c gl. 

 cephalic glands ; m. mouth ; 

 oe. oesophagus ; of. ovejector ; 

 o. ovary ; r. rectum ; ut. 

 uterus with segmenting eggs; 

 v. vagina. Magnified. 



-c.gl. 



2. 



'/-an 



FIG. 18. 



Fi*. 19. 



