PARASITOLOGY. 169 



and gradually thickening toward the posterior part; 

 slightly curved on the ventral surface. It fixes itself 

 to the mucous membrane by means of a sucker on 

 the posterior or large end. It is of a pinkish color 

 and about one-half inch in length. 



Animals Infested. — The ox, sheep, goat, and camel. 



Parts Infested. — The Rumen. 



Cojidition Produced. — They attach themselves to 

 the mucous membrane between the papillae of the 

 rumen ; most common near the oesophageal groove. 

 They are not reported as causing serious results. 



SCHISTOSOMIDAE. 



The family Schistosomidae includes the blood 

 flukes. 



(Soma — body) 

 SCHISTOSOMUM BqVIS (Bovis— ox) 



(Schistos— cleft) . 

 Synony7n. — Blood fluke. 



Description. — Small in size, round in shape and 

 provided with two suckers located on the anterior 

 end. The female is larger than the male. The eggs 

 are elongated and armed with sharp points. 



Animals Infested. — The ox and sheep. 



Parts Infested. — Blood vessels. 



Condition Produced. — The animals presumably be- 

 come infested through drinking water. The flukes 

 are found principally inhabiting the veins of the ab- 

 domen, more especially the venous plexuses of the 

 bladder and rectum. They may cause nephritis, 

 cystitis, and as a result bloody urine or feces. The 

 adjacent lymph glands become hypertrophied. The 

 condition may terminate in death. 



