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RESEARCH IN PROTOZOOLOGY 



agilis and the Giardia noted by Thomson (1925) in the nematode 

 worm Viannella from the viscacha is probably the same species, 

 named Giardia viscacice, which Lavier (1923) reported from the 

 viscacha. It is the object of this chapter to discuss methods of 

 obtaining and preparing material for study and problems and 

 methods of procedure for the solution of the many questions in- 

 volved in the host-parasite specificity of the members of this 

 genus. 



