ANIMAL PARASITES 73 



Potter, L. A., 1928. Two species of Giardia from the rat. Am. Jour. 



Hyg., 8 (1): 77-84. 

 Simon, C. E., 1922. A critique of the supposed rodent origin of human 



Giardiasis. Am. Jour. Hyg., 2 (4): 406-434. (Cf. Potter, 1928). 

 Wenrich, D. H., 1921. The structure and division of Trichomonas muris 



(Hartmann). Jour. Morphology, 36 (1): 119-154, plates 1-4. 



