178 



PARASITOLOGY. 



Taenia Expansa (Expansus— broad). 



Synonyjn. — Moniesia Planissima. Moniesia Ex- 

 pansa. 



Distribution. — Common in the United States, es- 

 pecially in range cattle. 



Descr:ptio)i. — Its head is very small, and is pro- 

 vided with four sucker discs ; the head is followed 

 by along, slender neck; the segments of specimens 

 from cattle often measure an inch in width ; these 

 widest segments are only about one-eighth of an 



, I 



'» -: 



c ' — . 



^^ — ^ « 



\ ^\ 



h -<• 



,' *\ 



»•— — — ■ 



1^ -i. 



!• •* 



' ^ H 



\^ ^ 



, . 



Fig. 66 —Taenia Expansa (from ox). 



a. Head. c, Mature segments. 



b, Neck. d, Partially developed segments. 



inch long. The specimens infesting sheep measure 

 only about one-half inch in width. The worm is 

 thin and segments translucent ; each segment is pro- 

 vided with two genital pores ; one located at each 

 margin. This worm may reach the length of twenty 

 to forty feet. 



Life Cycle. — Animals are supposed to become in- 



