PARASITOLOGY. 177 



is a slight attenuation toward the posterior extremity. 

 The entire worm measures from two to seven inches 

 long. 



Ajiimal Inhsted. — The horse. 



Parts Infested. — The caecum. 



Taenia Mamillana (Mammalis — mammal). 



Description. — The head is rounded, with the sucker 

 discs located at the side, in the form of slits; the 

 neck is absent, and the posterior border of the seg- 

 ments is wider than the anterior; the worm is much 

 smaller than the preceding one, measuring one to 

 one and one-half inches long. 



Animal Infested. — The horse. 



Parts Infested. — Small intestines. 



Taenia Plicata (Plicatus — to fold) . 



Description. — The head is thick and wide ; it is 

 depressed on either side ; the suckers are located at 

 the free end of the head, and are round; the neck is 

 absent; the segments are about one-half inch wide; 

 the worm measures from two to three inches in 

 length. 



Ajiinial Infested. — The horse. 



Parts Infested. — The intestines and colon. 



TAPEWORMS OF CATTLE AND SHEEP. 



The tapeworms of cattle and sheep are unarmed 

 Taenia. The segments are wider than long. The 

 life history outside of the body is unknown. 



Taeniasis among cattle and sheep is more com- 

 mon in summer than in winter. During the grass 

 season range cattle are especially prone toward this 

 infestation- 



