PARASITOLOGY. 159 



and attaches itself to the mucous membrane of the 

 small intestines by means of its six rows of booklets 

 and develops into the adult worm. 



Ajiimal Infested. — The hog. 



Parts Lifested. — The small intestines. 



Coiiditioji Prodiiced. — By the anchorage of the 

 cephalic extremity, by means of its hooked proboscis, 

 there is produced a small tumefaction which pushes 

 the serous covering of the intestine out ; from the 

 serous surface of the bowel this nodule resembles a 

 tubercle, and may be mistaken for tuberculosis; 

 upon close examination the head of the echino- 

 rhynchus will be found atta^*-**** \o the inner part of 

 the nodule. 



Symptoms. — When infested by large numbers they 

 may cause a loss of appetite, derangement of diges- 

 tion, general unthrifty condition and later emaciation 

 and convulsions; they may prove fatal among pigs. 



Treatment. — To remove the worms from the in- 

 testinal tract the same treatment is used as for the 

 Ascaris Suilla ; to prevent the hogs from becoming 

 infested it will be necessary to keep them on a board 

 floor so that it will be impossible for the ova to 

 reach the intermediate host, or to subject the feces 

 laden with ova to an antiseptic solution; as the white 

 worms are found most frequently in manure piles and 

 in very rich earth, these are the most fertile fields 

 for the intermediate host. 



ECHINORHYNCHUS CaNIS. 



History.^ — It has been found in Texas. 

 Animal Infested. — Dog. 

 Parts Infested. — Small intestines. 

 Description. — About one-half inch long. The ce- 

 phalic extremety is provided with a globe shaped 



