wide. In Capillaria felis-cati of the cat, the eggs are 61 to 64 microns 
long by 27 to 32 microns wide. This species occurs in the urinary 
bladder, the eggs passing in the urine. Eggs passing in the urine are 
quite likely to be found in the feces as a result of contamination. 
In C. aerophila of the dog, cat and fox, the eggs are 67 to 72 microns 
Fig. 13. Echinopardalis pardalis. Egg. Enlarged. From Travassos, 1917. 
long. This species occurs in the air passages of the lungs and the 
eggs pass out in the feces. The eggs of this species should be care¬ 
fully differentiated from those of the whipworm in examining feces 
from foxes, as this is a common parasite of foxes in North America. 
The eggs of the kidney worm of the dog and fox, Dioctophyme 
Fig. 14. Linguatula serrata. Egg. Enlarged. From Fiebiger, 1912, after Csokor. 
renale (Fig. 12), are ellipsoid, brownish, have a thick shell marked 
with numerous depressions, and are 64 to 66 microns long by 40 to 44 
microns wide. When the female worm is in the kidney, the eggs pass 
in the urine and may be found in feces as a result of contamination. 
23 
