DOMESTIC ANIMALS. 



189 



the parasite has once established a foothold in a sheep, 

 it is almost useless to attempt to dislodge it. 



STRONQYLUS FILARIA, LUNG-WORM. 



This worm, which is so destructive to young lambs 

 and calves, is seen in Figs. 89 and 90. The disease which 

 it produces is known as " hose in lambs," white-skin, 

 pelt-rot, etc. When the parasites are present in large 

 numbers, they cause bronchitis and pneumonia. 



6 



Figs. 89 & 90. Two specimens of strongylus filari*. 



