PLATE XL1I. 



TltWHOSTEONGYLUS PERGRACILIX AND DAVMNEA UROGALL1. 

 MBp 1 1 .^ : "Jj 



Fie. 11. 



FIG. 13. 



FIG. 12. 



Flo. 14. 



FIG. 11. (x5) showing large numV>ers of T. ptrgracUit on the internal surface of the civcum of a diseased Grouse (No. 13). 

 FIG. 12. (xlOO) showing a specimen of T. pergrncilis (in section) between two villi. The epithelium has been lost and 



fibrous tissue (a) has been formed within one of the villi in the neighbourhood of the worm. 

 FlO. 13. (J nat. size) showing two tubes containing the specimens of Davainea urogatli (on the left) and of Ilymfiiolfpis 



microps (on the right) obtained from Grouse No. 11. 

 FIG. 14. (nat. size) showing a tangled mass of iJavainea urogalli (partially opened out) from the intestine of a Grouse. 



Opposite p. 287.] 



