DISEASES OF HORSES AND CATTLE. 



389 



one of the most dangerous worms which attack any 

 of the domestic animals. They are found in the 

 cecum and colon, but may find their way into the 

 small intestine. They are supplied with hooks or 

 cup-shaped capsules by which they adhere firmly 

 to the lining membrane of the intestines. At the 

 point of attachment small, dark colored spots arise 

 which sometimes cover a considerable portion of 



Pig. 23— Portion of Wall of Caecum of Horse showing tumors 



of different size due to Sclerostoma, as well as the parasites 



fastened to the mucus membrane. (After Railliet.) 



the intestine. Usually, however, these worms 

 when lodged in the intestine do not appear to pro- 

 duce any peculiar symptom by which we could de- 

 tect them; but there is no doubt that when they 

 are present in large numbers they must cause pain 

 and probably inflammation and death. 



It is not the adult worm in the intestines which 

 •sually produces much trouble, but the young im- 



