VARIOUS FORMS OF TAPEWORMS. 55 



Other Tapeworms. 



jSTumerous other tapeworms exist in domestic animals. At 

 least fourteen are found in the dog. Tcenia serrata (fig. 16) 

 is often very common. Its cystic stage, known as Cystieercus 

 pisifm-mes, is found in the peritoneal cavity of rahhits and hares. 

 Dogs obtain this worm by eating the viscera of those animals. 

 Sheep have also several parasitic within them, which produce 

 scouring and emaciation. Tcenia expansa is often troublesome 

 in sheep, both in England and America. A specimen recently 

 placed in the museum of the South-Eastern Agricultural College 

 measured nine feet. 



Tseniosis is also sometimes a very troublesome complaint in 

 fowls, but so far has received little notice. 



The third order of Platyhelminthes does not concern us : they 

 are called Nemertini, most of which are free-living worms, a few 

 being parasitic in the mantle cavities of various mollusca. 



