254 



PARASITIC DISEASES 



body, or undergo certain development and again infest a host of 

 the same species from which they came, through the water, grass 

 and fodder that the animal may take into its digestive tract. 



Fig. 75. — -Large round-worm in intestine of hog. 



The following species of nematoids are common parasites 

 of domestic animals : 



SOLIPEDS 

 Species Organ 



Ascaris megalocephala Intestines 



Sclerostoma equinum Large intestine and blood-vessels 



Sclerostoma tetracanthum Large intestine 



Oxyrus curvula Large intestine 



Oxyrus mastigodes Large intestine 



Cattle 



Species Organ 



Strongj'lus convolutus Abomasiim 



Ascaris vituli Small intestine (calves) 



Strongj'lus ventricosus Small intestine 



CEsophagostomum inflatum Large intestine 



Trichoccphalus afllns Large intestine 



Strongylus micrurus Bronchi 



Strongylus puhnonaris Bronchi 



