176 PARASITOLOGY. 



small intestines would attach itself to the mucous 

 membrane by means of its four sucker discs and de- 

 velop into the adult worm ; if the meat is thoroughly 

 cooked the larvae are destroyed. These cysts 

 undergo degeneration as in the preceding species. 

 The writer has observed cysts in the heart of a four 

 year old steer in which many of the cysts had under- 

 gone degeneration. The cystic tissues had been re- 

 placed with a yellowish cheesy pus. The cystic 

 larva is called cysticercus bovis. The infestation 

 of beef with the cystic form of the Taenia Saginata 

 is called measly beef. 



Animals Infested. — Man by the adult worm ; cattle 

 by the larva. 



Parts Infested. — The adult infests the small intes- 

 tines ; the cystic form infests the muscle structures. 

 The most common locations of these cysts are the 

 masseter muscles, then the tongue and heart, and in 

 badly infested cases in all tissues of the body. 



Symptoms. — The symptoms of animals and persons 

 infested by this species are the same as that caused 

 by the preceding species. 



TAPEWORMS OF HORSES. 



The tapeworms of horses are three. Their life 

 history is unknown, and all are unarmed. They are 

 rare in the United States. 



Taenia Perfoliata (Per — through ; folium — leaf.) 



Description. — The head is large and globular in 



shape, and is provided with sucker discs ; the neck 



is absent; the segments are very short and at the 



terminal end are about one-half inch wide. There 



