PARASITOLOGY. 187 



collapses. Cysts have been known to retain their 

 vitality for many years. Dogs consuming these 

 cysts develop the mature worm. 



Atiimals bifested. — The adult Taenia infests the 

 dog; the larval (cystic or hydatic) form infests the 

 hog, sheep, ox and man. 



Of 1814 hogs killed at the Spartanburg, S. C, muni- 

 cipal abattoir from March 13, 1913 to March 1, 1914 

 2.3% were afifected by the Cysticercus Echinococcus 

 of the liver. 



Parts Infested. — The adult is found in the small in- 

 testines; the larval form in the liver, principally; 

 occasionally in the lungs and sometimes in other 

 organs. Sections of liver adjacent to the cyst shows 

 eO'Sinophilia. 



Sympto7ns. — When the cysts invade an organ to a 

 sufficient extent they interfere with the functions of 

 that organ ; animals so infested gradually lose con- 

 dition; there is loss of appetite, jaundice, oedema 

 under breast or neck and jaws; nervous disorders if 

 they should invade the brain. 



In dogs, infestation by myriads of adults, produces 

 indigestion, nervousness, nausea and gradual loss of 

 condition. 



Taenia Coenurus (Common tail) , 



Distribution. — Found in European countries; re- 

 ported in the United S^tes from New York and 

 Montana by Hall. 



Description. — The head is small and provided with 

 four sucker discs and a rostellum of from twenty-two 

 to thirty-two booklets ; the neck is narrow ; the 

 mature segments are as long as wide ; the genital 



