78 PARASITOLOGY. 
Taenoides. 
Distribution.—Common in Europe; not reported 
in the United States. 
Description.—The body of the adult is white, elon- 
gated and lanceolate shaped toward the head. It 
tapers posteriorly and presents the general appear- 
ance of aworm. The ventral surface is flattened; 
it is rounded dorsally; the body is composed of 
about ninety rings; the head part is provided with 
small hooklets which enable it to hold on firmly. 
The males are much smaller than the females. 
Animals Intested.—Adult infests dogs; larva infest 
cattle, sheep, etc. 
Lite History.—The adult deposits the ova in the 
nasal chambers of the dog, and they are afterward 
expelled by the animal when sneezing ; thus the grass 
of the pastures or other food or water become con- 
taminated with the eggs. These eggs are taken in 
by the intermediate host, and upon reaching the 
stomach hatch and liberate the embryos. The em- 
bryos are ovoid in shape, flat below and convex 
above, and thus somewhat resemble the Acari. 
They are provided with two pair of legs. The head 
extremity is furnished with a stylet-shaped boring 
apparatus. By means of this boring apparatus they 
find their way through the stomach or intestinal wall 
and become located in the mesenteric lymph glands, 
lungs or liver, where they develop into fully formed 
larvae. This transformation requires about seven 
months. 
Condition Produced.—The larvae thus encysted are 
taken in by carnivorous animals, through consump- 
tion of the affected part, or the larvae may leave the 
