THE TAPEWORMS 59 



c. Locate the following parts, i, ventral sucker, 2, uterus, 3, in- 

 testinal branches, 4, ovarium. 



Draw a specimen, and label all the parts named in the preced- 

 ing exercise that you can find. 



B. Examine specimens of Fasciola americana (Distomum 

 magnum) the giant fluke of cattle, infesting both the liver and 

 lungs of the host. Compare these specimens with specimens of 

 Distomum hepaticum, as to size, shape, color, absence in this 

 species of superficial spines, etc. 



C. Paragonimus westermanni is the lung fluke of man, occa- 

 sionally found in other animals. This fluke is the cause of a 

 Hemoptysis. 



a. What is the form and size of this fluke? 



b. Locate i, the uterus, 2, the ovarium, 3, two testes. 

 Draw the specimen. 



D. Schisostomum hcematobium (this fluke, unlike all the 

 above, which are Distomidae, belongs to the Family Schistoso- 

 midae) is a Trematode producing h&maturia or Bilharzia disease 

 of humans. 



Examine a specimen and describe it. 



EXERCISE 33 



THE TAPEWORMS A MORPHOLOGICAL STUDY 



PHYLUM PLATYHELMINTHES, CLASS CESTODA 



The following tapeworm characters cannot well be studied 

 without specimens of both the beef tapeworm, T&nia saginata, 

 and the fish tapeworm, Bothriocephalus latus, or closely related 

 genera, before you. Mounted and stained parts as well as un- 

 mounted specimens are needed. 



A. General. 



a. Tapeworms are more or less ribbon-like inform. 



