136 SINGLE-CELLED ANIMALS AS ORGANISMS 



Hunter, Essentials of Biology, Chap. XV. American Book Company. 



Calkins, Protozoology. Lea and Febiger. 



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Guyer, Animal Micrology. University of Chicago Press. 

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 Ritchie, Primer of Sanitation, Chap. XXVI. World Book Company. 

 Shannon, The Microscopic Animals of the Sea. Harper's Magazine, June, 1910. 

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